【０００１】[0001]
【発明の属する技術分野】冷媒搬送手段として圧縮機と
液ポンプの双方を備え、状況に応じてそれぞれを切り換
えて運転する空気調和装置に関わる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with both a compressor and a liquid pump as refrigerant transfer means, and switching between them according to the situation to operate.
【０００２】[0002]
【従来の技術】従来例１．図５は冷媒搬送手段として圧
縮機と液ポンプ双方を有し、年間冷房用途の空気調和装
置に適用した従来の空気調和装置のブロック図である。
図において、１は後述する凝縮器４からなる室外ユニッ
ト、２は圧縮機３、絞り装置５、蒸発器６からなる室内
ユニット、８は液ポンプ、４１、４２、４３は各々第１
開閉弁、第２開閉弁、第３開閉弁である。また、冷媒が
巡回する閉回路が圧縮機３、凝縮器４、液ポンプ８、絞
り装置５、蒸発器６の順に形成されている。更に、この
閉回路において、液ポンプ８に並列して第１開閉弁４１
が設けられ、絞り装置５に並列して第２開閉弁４２が設
けられ、圧縮機３に並列して第３開閉弁４３が設けられ
ている。2. Description of the Related Art FIG. 5 is a block diagram of a conventional air conditioner that has both a compressor and a liquid pump as refrigerant transport means and is applied to an air conditioner for annual cooling use.
In the figure, 1 is an outdoor unit comprising a condenser 4 to be described later, 2 is an indoor unit comprising a compressor 3, a throttle device 5, and an evaporator 6, 8 is a liquid pump, and 41, 42 and 43 are each a first unit.
An on-off valve, a second on-off valve, and a third on-off valve. Further, a closed circuit in which the refrigerant circulates is formed in the order of the compressor 3, the condenser 4, the liquid pump 8, the expansion device 5, and the evaporator 6. Further, in this closed circuit, the first on-off valve 41 is connected in parallel with the liquid pump 8.
, A second on-off valve 42 is provided in parallel with the expansion device 5, and a third on-off valve 43 is provided in parallel with the compressor 3.
【０００３】次に、動作について説明する。この空気調
和装置は、通常の冷房運転を行う際には圧縮機運転を行
い、冬期や夜間など外気が室内より低温となる場合に液
ポンプ運転を行うものである。Next, the operation will be described. This air conditioner performs a compressor operation when performing a normal cooling operation, and performs a liquid pump operation when the outside air is lower than the room temperature in winter or at night.
【０００４】まず、圧縮機運転時について説明する。ま
ず、第１開閉弁４１を開放し、第２開閉弁４２及び第３
開閉弁４３を閉止しておいてから、圧縮機運転を行な
う。次に、圧縮機３から吐出された高温高圧のガス冷媒
が凝縮器４に入り、外気と熱交換して液冷媒となる。次
に、第１開閉弁４１を開放している為、ガス冷媒は液ポ
ンプ８を通らずに第１開閉弁４１を通る。更に、第２開
閉弁４２を閉止している為、第１開閉弁４１を通過した
ガス冷媒は絞り装置５で減圧されて、乾き度の低い二相
冷媒となって蒸発器６に入る。次に、蒸発器６で蒸発し
たガス冷媒は再び圧縮機３に吸引される。以上のサイク
ルを繰り返すことにより圧縮機運転が行なわれる。[0004] First, the operation of the compressor will be described. First, the first on-off valve 41 is opened, and the second on-off valve 42 and the third
After the on-off valve 43 is closed, the compressor is operated. Next, the high-temperature and high-pressure gas refrigerant discharged from the compressor 3 enters the condenser 4 and exchanges heat with the outside air to become a liquid refrigerant. Next, since the first on-off valve 41 is opened, the gas refrigerant passes through the first on-off valve 41 without passing through the liquid pump 8. Further, since the second on-off valve 42 is closed, the gas refrigerant that has passed through the first on-off valve 41 is decompressed by the expansion device 5, becomes a two-phase refrigerant with low dryness, and enters the evaporator 6. Next, the gas refrigerant evaporated in the evaporator 6 is sucked into the compressor 3 again. The compressor operation is performed by repeating the above cycle.
【０００５】次に、液ポンプ運転時について説明する。
まず、第１開閉弁４１を閉止し、第２開閉弁４２及び第
３開閉弁４３を開放しておいてから、液ポンプ運転を行
なう。次に、液ポンプ８から吐出された液冷媒は、第２
開閉弁４２が開放されている為、絞り装置５を通らずに
第２開閉弁４２を通って蒸発器６に入る。次に、蒸発器
６に入ってきた液冷媒は、蒸発器６において室内の高温
空気と熱交換を行ないガス冷媒となる。更に、第３開閉
弁４３が開放されている為、圧縮機３を通らずに第３開
閉弁４３を通って凝縮器４へと流入する。次に、凝縮器
４へと流入してきたガス冷媒は凝縮器４において外気と
熱交換して液化され、再び液ポンプ８に吸引される。以
上のサイクルを繰り返すことにより液ポンプ運転が行な
われる。Next, the operation of the liquid pump will be described.
First, the first on-off valve 41 is closed, the second on-off valve 42 and the third on-off valve 43 are opened, and then the liquid pump is operated. Next, the liquid refrigerant discharged from the liquid pump 8
Since the on-off valve 42 is open, the gas enters the evaporator 6 through the second on-off valve 42 without passing through the throttle device 5. Next, the liquid refrigerant that has entered the evaporator 6 exchanges heat with the high-temperature air in the room in the evaporator 6 to become a gas refrigerant. Further, since the third on-off valve 43 is open, the gas flows into the condenser 4 through the third on-off valve 43 without passing through the compressor 3. Next, the gas refrigerant flowing into the condenser 4 exchanges heat with the outside air in the condenser 4 to be liquefied, and is sucked into the liquid pump 8 again. The liquid pump operation is performed by repeating the above cycle.
【０００６】このように従来の技術においては、圧縮機
運転時には第１開閉弁４１は開放されて液ポンプ８をバ
イパスし、液ポンプ運転時には第２開閉弁４２、第３開
閉弁４３が開放されて、絞り装置５と圧縮機３をバイパ
スした経路を形成して、液ポンプ運転が行なわれてい
た。As described above, in the prior art, the first on-off valve 41 is opened to bypass the liquid pump 8 during the operation of the compressor, and the second on-off valve 42 and the third on-off valve 43 are opened during the operation of the liquid pump. Thus, a liquid pump operation is performed by forming a path that bypasses the expansion device 5 and the compressor 3.
【０００７】この液ポンプ運転時は、冷媒を昇圧する際
に体積変化を伴わないため、ガス圧縮に比べて冷媒搬送
動力を大きく低減でき、省エネルギーな冷房運転が可能
となる。During the operation of the liquid pump, the volume of the refrigerant is not changed when the pressure of the refrigerant is increased. Therefore, the power for transporting the refrigerant can be greatly reduced as compared with the case of gas compression, and the cooling operation with energy saving can be performed.
【０００８】しかしながら、通常ヒートポンプサイクル
の作動流体に使用される冷媒は水よりも低粘度であり潤
滑性に乏しく、水用ポンプをそのまま冷媒に適用しても
信頼性に問題がある。その為に、冷媒用の液ポンプ８
は、軸受などの摺動部をセラミックスなどの硬い材料に
変更したり、潤滑性の高い樹脂系材料に変更するなどの
対策が取られていた。However, the refrigerant usually used as the working fluid of the heat pump cycle has a lower viscosity than water and has poor lubricity, and there is a problem in reliability even if the water pump is applied to the refrigerant as it is. Therefore, the liquid pump 8 for the refrigerant
In such a case, measures have been taken such as changing the sliding portion such as a bearing to a hard material such as ceramics or changing to a resin material having high lubricity.
【０００９】従来例２．複数台の液ポンプ８を備えた空
気調和装置の場合が、例えば特開平９−２２９４３４に
示されている。この空気調和装置は、液ポンプ８への入
力電流を検知する電流検知手段と、運転時間を積算する
積算手段からなる制御手段を備え、所定値以上の入力電
流を検知した場合の運転積算時間から、複数台の液ポン
プ８の運転優先順位を変更して運転頻度を均一化するも
のである。更には、吐出圧力が所定値以上となった回数
を積算することでポンプ異常を検知し、異常とされたポ
ンプを運転しない制御手段を備えた空気調和装置が提案
されている。Conventional example 2. An air conditioner provided with a plurality of liquid pumps 8 is disclosed in, for example, JP-A-9-229434. The air conditioner includes a current detection unit that detects an input current to the liquid pump 8 and a control unit that includes an integration unit that integrates the operation time, and calculates the operation integration time when an input current of a predetermined value or more is detected. The operation priority of the plurality of liquid pumps 8 is changed to make the operation frequency uniform. Further, there has been proposed an air conditioner including a control unit that detects a pump abnormality by integrating the number of times that the discharge pressure becomes equal to or higher than a predetermined value and does not operate the abnormal pump.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、従来例
１のように、圧縮機サイクルと液ポンプサイクルが分離
されていない場合には、液ポンプ８の異常が故障と判断
されるレベルにはなくとも、例えば液ポンプ８の摩耗が
進行した場合に発生する摩耗粉が圧縮機サイクルに多大
な悪影響を及ぼし、圧縮不良や絞り装置の閉塞などの要
因ともなり得る。However, when the compressor cycle and the liquid pump cycle are not separated, as in the prior art 1, even if the abnormality of the liquid pump 8 is not at a level at which it is determined that a failure has occurred, it is not necessary to perform the operation. For example, abrasion powder generated when the wear of the liquid pump 8 progresses has a great adverse effect on the compressor cycle, and may cause factors such as poor compression and blockage of the expansion device.
【００１１】また、従来例２のような構成では、液ポン
プ８に入力される入力電流や液ポンプ８から吐出される
冷媒の吐出圧力上昇を伴わない異常が進行した場合に、
そのままの状態で液ポンプ運転を続けると、冷媒流量不
足によって空調能力が低下し、空調対象室の室温制御不
能となる可能性がある。Further, in the configuration as in the second conventional example, when an abnormality that does not accompany an increase in the input current input to the liquid pump 8 or the discharge pressure of the refrigerant discharged from the liquid pump 8 proceeds,
If the operation of the liquid pump is continued as it is, the air conditioning capacity may be reduced due to the insufficient flow rate of the refrigerant, and the room temperature of the room to be air-conditioned may not be controlled.
【００１２】本発明の目的は、圧縮機３と液ポンプ８双
方の冷媒搬送手段を備えた空気調和装置において、液ポ
ンプ８に不具合が発生した際に、圧縮機サイクルへ悪影
響が生じる前に液ポンプ運転モードに入らないように制
御し、空気調和装置の故障による運転停止を防止すると
ともに、液ポンプ交換時期を容易に把握できる空気調和
装置を提供することである。An object of the present invention is to provide an air conditioner equipped with a refrigerant conveying means for both a compressor 3 and a liquid pump 8 so that when a malfunction occurs in the liquid pump 8, the liquid is removed before the compressor cycle is adversely affected. An object of the present invention is to provide an air conditioner that controls so as not to enter a pump operation mode, prevents an operation stop due to a failure of the air conditioner, and can easily grasp a liquid pump replacement time.
【００１３】[0013]
【課題を解決するための手段】第１の発明に係る空気調
和装置は、圧縮機、凝縮器、絞り装置及び蒸発器を接続
した圧縮機回路と、液ポンプ、前記凝縮器、前記蒸発器
を接続した液ポンプ回路とから構成される空気調和装置
において、前記圧縮機回路若しくは前記液ポンプ回路を
選択する回路選択手段と、前記液ポンプの運転状況を検
知する液ポンプ運転検知手段と、前記液ポンプ運転検知
手段の検知結果を基にして前記回路選択手段を制御し、
前記液ポンプ回路から前記圧縮機回路に切り替える運転
制御手段とを備えたものである。An air conditioner according to a first aspect of the present invention includes a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, a liquid pump, the condenser, and the evaporator. An air conditioner comprising a liquid pump circuit connected thereto; a circuit selecting means for selecting the compressor circuit or the liquid pump circuit; a liquid pump operation detecting means for detecting an operation state of the liquid pump; Controlling the circuit selection means based on the detection result of the pump operation detection means,
Operation control means for switching from the liquid pump circuit to the compressor circuit.
【００１４】第２の発明に係る空気調和装置は、第１の
発明において前記液ポンプ運転検知手段が、前記液ポン
プから吐出される冷媒の流量を検知する流量変化検知手
段と、前記液ポンプへの入力電流値を検知する電流変化
検知手段と、前記液ポンプから吐出される摩耗粉の量を
検知する異常摩耗検知手段とのうち少なくとも１つ以上
から構成されるものである。According to a second aspect of the present invention, in the air conditioner according to the first aspect, the liquid pump operation detecting means includes a flow rate change detecting means for detecting a flow rate of the refrigerant discharged from the liquid pump; And at least one of abnormal wear detecting means for detecting the amount of wear powder discharged from the liquid pump.
【００１５】第３の発明に係る空気調和装置は、圧縮
機、凝縮器、絞り装置及び蒸発器を接続した圧縮機回路
と、液ポンプ、前記凝縮器、前記蒸発器を接続した液ポ
ンプ回路とから構成される空気調和装置において、前記
圧縮機回路若しくは前記液ポンプ回路を選択する回路選
択手段と、冷媒と周囲の空気との間で熱交換を行う前記
蒸発器にて熱交換された周囲の空気の温度を検知する温
度検出手段と、前記液ポンプの運転状況を検知する液ポ
ンプ運転検知手段と、前記液ポンプ前記温度検知手段の
検知結果を基にして前記回路選択手段を制御し、前記液
ポンプ回路から前記圧縮機回路に切り替える運転制御手
段とを備えたものである。An air conditioner according to a third aspect of the present invention includes a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, and a liquid pump circuit connecting the liquid pump, the condenser, and the evaporator. In the air conditioner, the circuit selection means for selecting the compressor circuit or the liquid pump circuit, and the surrounding heat exchanged by the evaporator that performs heat exchange between refrigerant and surrounding air A temperature detecting means for detecting a temperature of the air, a liquid pump operation detecting means for detecting an operation state of the liquid pump, and controlling the circuit selecting means based on a detection result of the temperature detecting means for the liquid pump; Operation control means for switching from the liquid pump circuit to the compressor circuit.
【００１６】第４の発明に係る空気調和装置は、圧縮
機、凝縮器、絞り装置及び蒸発器を接続した圧縮機回路
と、液ポンプ、前記凝縮器、前記蒸発器を接続した液ポ
ンプ回路とから構成される空気調和装置において、前記
圧縮機回路若しくは前記液ポンプ回路を選択する回路選
択手段と、冷媒と周囲の空気との間で熱交換を行う前記
蒸発器にて熱交換された冷媒の温度を検知する温度検知
手段と、前記温度検知手段で検知された冷媒の温度と所
定の温度とを比較して前記回路選択手段を制御し、前記
液ポンプ回路から前記圧縮機回路に切り替える運転制御
手段とを備えたものである。An air conditioner according to a fourth aspect of the present invention includes a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, a liquid pump circuit connecting the liquid pump, the condenser, and the evaporator. In the air conditioner comprising: a circuit selecting means for selecting the compressor circuit or the liquid pump circuit, and the refrigerant heat exchanged in the evaporator that performs heat exchange between the refrigerant and the surrounding air Temperature detection means for detecting the temperature, operation control for comparing the temperature of the refrigerant detected by the temperature detection means with a predetermined temperature, controlling the circuit selection means, and switching from the liquid pump circuit to the compressor circuit Means.
【００１７】第５の発明に係る空気調和装置は、第４の
発明において前記所定の温度が、前記蒸発器の中間温度
であるものである。An air conditioner according to a fifth invention is the air conditioner according to the fourth invention, wherein the predetermined temperature is an intermediate temperature of the evaporator.
【００１８】第６の発明に係る空気調和装置は、圧縮
機、凝縮器、絞り装置及び蒸発器を接続した圧縮機回路
と、液ポンプ、前記凝縮器、前記蒸発器を接続した液ポ
ンプ回路とから構成される空気調和装置において、前記
液ポンプ回路内の前記液ポンプの吐出口に設けられ、前
記液ポンプから吐出される前記冷媒中の異物を捕捉する
フィルタと、前記液ポンプと前記フィルタとの間に設け
られ、前記液ポンプから吐出される圧力値を検知する圧
力検知手段と、前記圧縮機回路若しくは前記液ポンプ回
路を選択する回路選択手段と、前記圧力検知手段により
検出された圧力値に基にして前記回路選択手段を制御
し、前記液ポンプ回路から前記圧縮機回路に切り替える
運転制御手段とを備えたものである。An air conditioner according to a sixth aspect of the present invention includes a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, a liquid pump circuit connecting the liquid pump, the condenser, and the evaporator. In the air conditioner composed of: a filter provided at a discharge port of the liquid pump in the liquid pump circuit, for capturing foreign matter in the refrigerant discharged from the liquid pump, the liquid pump and the filter A pressure detecting means for detecting a pressure value discharged from the liquid pump, a circuit selecting means for selecting the compressor circuit or the liquid pump circuit, and a pressure value detected by the pressure detecting means. Operation control means for controlling the circuit selection means on the basis of the above, and switching from the liquid pump circuit to the compressor circuit.
【００１９】第７の発明に係る空気調和装置は、第１乃
至第６の発明において、前記液ポンプが、浸漬型の渦流
ポンプを液タンク内に複数台搭載して構成されるもので
ある。An air conditioner according to a seventh aspect is the air conditioner according to the first to sixth aspects, wherein the liquid pump is configured by mounting a plurality of immersion type vortex pumps in a liquid tank.
【００２０】第８の発明に係る空気調和装置は、第１乃
至第６の発明において、前記液ポンプが、着脱可能な構
造であるものである。An air conditioner according to an eighth aspect is the air conditioner according to the first to sixth aspects, wherein the liquid pump has a detachable structure.
【００２１】[0021]
【発明の実施の形態】実施の形態１．本実施の形態にお
いて、従来の技術と同一の符号を付した箇所は同一また
は相当部分を示す。図１は、この発明の一実施の形態に
おける空気調和装置の一例を示すブロック構成図であ
り、特に、通信基地局の機械室や電算室など、年間を通
じて冷房が必要な空間の空調を行う空気調和装置を示し
たものである。図において、１は室外ユニット、２は室
内ユニット、４は従来の技術における凝縮器と同等であ
り、冷媒の回路中の冷媒と周囲の空気（室外の空気）と
の間で熱の授受を行なう室外熱交換器、６は従来の技術
における蒸発器と同等であり、冷媒の回路中の冷媒と周
囲の空気（室内の空気）との間で熱の授受を行なう室内
熱交換器、７はアキュムレータである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 In the present embodiment, portions denoted by the same reference numerals as those of the conventional technology indicate the same or corresponding portions. FIG. 1 is a block diagram showing an example of an air conditioner according to an embodiment of the present invention. In particular, an air conditioner that air-conditions a space that needs cooling throughout the year, such as a machine room or a computer room of a communication base station. 1 shows a harmony device. In the figure, 1 is an outdoor unit, 2 is an indoor unit, and 4 is equivalent to a conventional condenser, and transfers heat between a refrigerant in a refrigerant circuit and ambient air (outdoor air). An outdoor heat exchanger 6 is equivalent to an evaporator in the prior art, and is an indoor heat exchanger for transferring heat between a refrigerant in a refrigerant circuit and surrounding air (indoor air), and 7 is an accumulator. It is.
【００２２】また、９は液ポンプ８の直後に設けられ、
冷媒中の含まれる異物、主に液ポンプ８から冷媒と一緒
に吐出される摩耗粉を捕捉するフィルタ、１０は後述す
る圧縮機側開閉弁１１、アキュムレータ７、圧縮機３を
バイパスし、液ポンプ８による冷媒の循環方向を順方向
となるように接続された逆止弁、１１はアキュムレータ
７と室内熱交換器６との間に設けられた圧縮機側開閉
弁、１２は閉回路に並列に接続された液ポンプ８の直前
に設けられた液ポンプ側開閉弁、１３は後述する運転制
御手段１４、異常判定手段１５、流量変化検知手段１
６、電流変化検知手段１７、異常摩耗検知手段１８から
構成され、液ポンプ回路の状態により液ポンプ回路と圧
縮機回路との切り換えの制御を行う制御装置、１４は後
述する異常判定手段１５からの判定結果に基づいて液ポ
ンプ回路と圧縮機回路との切り換えの制御を行う運転制
御手段、１５は後述する流量変化検知手段１６、電流変
化検知手段１７及び異常摩耗検知手段１８からの検知結
果から液ポンプ回路の状態の異常を判定する異常判定手
段、１６は液ポンプ８から吐出される冷媒の流量を検知
する流量変化検知手段、１７は液ポンプ８への入力電流
値を検知する電流変化検知手段、１８は後述する圧力検
知手段２１からの圧力値を読み取る異常摩耗検知手段、
１９は異常判定手段１５において異常と判定された際に
ユーザーに知らせる異常表示手段である。Further, 9 is provided immediately after the liquid pump 8,
A filter 10 for trapping foreign matter contained in the refrigerant, mainly abrasion powder discharged together with the refrigerant from the liquid pump 8, bypasses the compressor-side on-off valve 11, the accumulator 7, and the compressor 3, which will be described later. A check valve 11 is connected so that the circulation direction of the refrigerant by 8 is forward, 11 is a compressor-side on-off valve provided between the accumulator 7 and the indoor heat exchanger 6, and 12 is a parallel circuit in a closed circuit. A liquid pump side opening / closing valve 13 provided immediately before the connected liquid pump 8 includes an operation control unit 14, an abnormality determination unit 15, and a flow rate change detection unit 1, which will be described later.
6. A control device comprising a current change detecting means 17 and an abnormal wear detecting means 18 for controlling the switching between the liquid pump circuit and the compressor circuit according to the state of the liquid pump circuit. An operation control means 15 for controlling the switching between the liquid pump circuit and the compressor circuit based on the determination result. Abnormality determining means for determining an abnormality in the state of the pump circuit, 16 is a flow rate change detecting means for detecting the flow rate of the refrigerant discharged from the liquid pump 8, and 17 is a current change detecting means for detecting an input current value to the liquid pump 8. , 18 are abnormal wear detecting means for reading a pressure value from a pressure detecting means 21 described later,
Reference numeral 19 denotes an abnormality display unit that notifies the user when the abnormality is judged to be abnormal by the abnormality judgment unit 15.
【００２３】また、２０ａは室外ユニット１に設けられ
室外の温度を測定する第１の温度検知手段、２０ｂは室
内ユニット２に設けられ室内の空気温度を測定する第２
の温度検知手段、２０ｃは室内熱交換器６に設けられ、
室内熱交換器６中における冷媒の蒸発温度若しくは凝縮
温度としての室内熱交換器中間温度を測定する第３の温
度検知手段、２０ｄは室内熱交換器６から吐出される冷
媒の熱交換器の出口での温度、即ち室内熱交換器出口温
度を測定する第４の温度検知手段、２０ｅは室内熱交換
器６内で冷媒と熱交換を行った空気が室内ユニット２か
ら室内へ吹き出すときの室内吹出し温度を測定する第５
の温度検知手段、２１は液ポンプ８とフィルタ９との間
に設けられ、液ポンプ８から吐出される冷媒の圧力を測
定する圧力測定手段である。尚、流量変化検知手段１
６、電流変化検知手段１７、異常摩耗検知手段１８のう
ち少なくとも１つが液ポンプ運転検知手段を担うもので
ある。Reference numeral 20a denotes a first temperature detecting means provided in the outdoor unit 1 for measuring the outdoor temperature, and reference numeral 20b denotes a second temperature detecting means provided in the indoor unit 2 for measuring the indoor air temperature.
Temperature detection means, 20c is provided in the indoor heat exchanger 6,
A third temperature detecting means for measuring the intermediate temperature of the indoor heat exchanger as the evaporation temperature or the condensation temperature of the refrigerant in the indoor heat exchanger 6, 20d is an outlet of the heat exchanger of the refrigerant discharged from the indoor heat exchanger 6. The fourth temperature detecting means 20e for measuring the temperature of the indoor heat exchanger, ie, the outlet temperature of the indoor heat exchanger, is an indoor blowout when the air that has exchanged heat with the refrigerant in the indoor heat exchanger 6 blows out from the indoor unit 2 into the room. Fifth to measure temperature
The temperature detecting means 21 is provided between the liquid pump 8 and the filter 9 and is a pressure measuring means for measuring the pressure of the refrigerant discharged from the liquid pump 8. The flow rate change detecting means 1
6. At least one of the current change detecting means 17 and the abnormal wear detecting means 18 serves as the liquid pump operation detecting means.
【００２４】本実施の形態における冷媒の回路は、圧縮
機３、室外熱交換器４、絞り装置５、室内熱交換器６、
アキュムレータ７の順に環状に接続され、更にこの回路
の絞り装置５に並列するように液ポンプ８が接続されて
構成されている。即ち、圧縮機３、室外熱交換器４、絞
り装置５、室内熱交換器６及びアキュムレータ７から構
成される圧縮機回路と室外熱交換器４、液ポンプ８、室
内熱交換器６から構成される液ポンプ回路との２系統が
混在した構成となっている。The refrigerant circuit in the present embodiment includes a compressor 3, an outdoor heat exchanger 4, a throttle device 5, an indoor heat exchanger 6,
An accumulator 7 is connected in a ring shape in this order, and a liquid pump 8 is connected in parallel with the expansion device 5 of this circuit. That is, the compressor circuit includes the compressor 3, the outdoor heat exchanger 4, the expansion device 5, the indoor heat exchanger 6, and the accumulator 7, and the outdoor heat exchanger 4, the liquid pump 8, and the indoor heat exchanger 6. And a liquid pump circuit.
【００２５】また、圧縮機回路は、液ポンプ側開閉弁１
２を閉止し、一方圧縮機側開閉弁１１及び絞り装置５を
開放した際に、圧縮機３、室外熱交換器４、絞り装置
５、室内熱交換器６、アキュムレータ７の回路として形
成される。尚、逆止弁１０は圧縮機３の吐出圧力によっ
て閉止される。The compressor circuit includes a liquid pump side on-off valve 1
When the compressor 2 is closed and the compressor-side on-off valve 11 and the expansion device 5 are opened, a circuit of the compressor 3, the outdoor heat exchanger 4, the expansion device 5, the indoor heat exchanger 6, and the accumulator 7 is formed. . The check valve 10 is closed by the discharge pressure of the compressor 3.
【００２６】一方、液ポンプ回路は、液ポンプ側開閉弁
１２を開放し、圧縮機側開閉弁１１及び絞り装置５を閉
止した際に、液ポンプ８、室内熱交換器６、室外熱交換
器４の回路として形成される。尚、逆止弁１０は液ポン
プ８の吐出圧力によって開放され、圧縮機３とアキュム
レータ７とをバイパスする働きがある。On the other hand, when the liquid pump circuit opens and closes the liquid pump-side on-off valve 12 and closes the compressor-side on-off valve 11 and the throttle device 5, the liquid pump 8, the indoor heat exchanger 6, and the outdoor heat exchanger 4 circuits. The check valve 10 is opened by the discharge pressure of the liquid pump 8, and has a function of bypassing the compressor 3 and the accumulator 7.
【００２７】尚、第１の温度検知手段２０ａと運転制御
手段１４、第２の温度検知手段２０ｂと運転制御手段１
４及び流量変化検知手段１６と、第３〜第５の温度検知
手段２０ｃ〜２０ｅと流量変化検知手段１６とは夫々互
いに接続されている。また、運転制御手段１４は制御信
号を送信する為に圧縮機３、液ポンプ８、第１の開閉弁
１１、第２の開閉弁１２と接続されている。更に、圧力
検知手段２１は検知した圧力値を送信する為異常摩耗検
知手段１８と接続されている。The first temperature detecting means 20a and the operation control means 14 and the second temperature detecting means 20b and the operation control means 1
4 and the flow rate change detecting means 16, the third to fifth temperature detecting means 20c to 20e, and the flow rate change detecting means 16 are connected to each other. The operation control means 14 is connected to the compressor 3, the liquid pump 8, the first on-off valve 11, and the second on-off valve 12 for transmitting a control signal. Further, the pressure detecting means 21 is connected to the abnormal wear detecting means 18 for transmitting the detected pressure value.
【００２８】次に、動作について説明する。まず、運転
制御手段１４が第１の温度検知手段２０ａ及び第２の温
度検知手段２０ｂから夫々室外の空気温度及び室内の空
気温度を読み取る。尚、運転制御手段１４は予め、室内
の希望の設定温度が記憶されている。読み取った室内の
空気温度が希望の設定温度よりも高いと判断された場合
には、冷房運転を開始する。この際、読み取った室外の
温度が設定温度よりも高い場合は圧縮機運転により冷房
運転が行われ、一方低い場合には液ポンプ８により冷房
運転が行われることとなる。Next, the operation will be described. First, the operation control means 14 reads the outdoor air temperature and the indoor air temperature from the first temperature detecting means 20a and the second temperature detecting means 20b, respectively. In the operation control means 14, a desired set temperature in the room is stored in advance. If it is determined that the read room air temperature is higher than the desired set temperature, the cooling operation is started. At this time, when the read outdoor temperature is higher than the set temperature, the cooling operation is performed by the compressor operation, and when it is lower, the cooling operation is performed by the liquid pump 8.
【００２９】（１）外気温度が所定値よりも高い場合に
よる圧縮機運転 次に、外気温度が所定値よりも高い場合について説明す
る。この場合には、圧縮機回路が選択され圧縮機運転に
よる冷房運転が行われる。(1) Compressor operation when the outside air temperature is higher than a predetermined value Next, a case where the outside air temperature is higher than a predetermined value will be described. In this case, the compressor circuit is selected and the cooling operation by the compressor operation is performed.
【００３０】まず、運転制御手段１４により圧縮機回路
を選択する。次に、圧縮機回路が構成されると運転制御
手段１４により圧縮機を運転させる。尚、この際すでに
液ポンプ８の運転が行われている場合は、液ポンプ８の
運転を終了させた後、圧縮機３の運転を開始させる。First, the operation control means 14 selects a compressor circuit. Next, when the compressor circuit is constructed, the compressor is operated by the operation control means 14. In this case, if the operation of the liquid pump 8 has already been performed, the operation of the compressor 3 is started after the operation of the liquid pump 8 is terminated.
【００３１】（２）外気温度が所定値よりも低い場合に
よる液ポンプ運転 次に、外気温度が所定値よりも低い場合について説明す
る。この場合には、液ポンプ回路が選択され、液ポンプ
運転による冷房運転が行われる。(2) Operation of the liquid pump when the outside air temperature is lower than a predetermined value Next, a case where the outside air temperature is lower than a predetermined value will be described. In this case, the liquid pump circuit is selected, and the cooling operation by the liquid pump operation is performed.
【００３２】まず、運転制御手段１４により液ポンプ回
路を選択する。次に、液ポンプ回路が構成されると運転
制御手段１４は液ポンプ８の運転を開始させる。尚、こ
の際すでに圧縮機３の運転が行われている場合は、圧縮
機３の運転を終了させた後、液ポンプ８の運転を開始さ
せる。First, the operation control means 14 selects a liquid pump circuit. Next, when the liquid pump circuit is configured, the operation control means 14 starts the operation of the liquid pump 8. In this case, if the operation of the compressor 3 has already been performed, the operation of the liquid pump 8 is started after the operation of the compressor 3 is terminated.
【００３３】この液ポンプ８によって冷房運転が行われ
ている際、異常判定手段１５は、冷房能力が正常か否
か、即ち液ポンプ回路の状態に異常が無いか常に監視し
ている。その為、異常判定手段１５は、常に流量変化検
知手段１６、電流変化検知手段１７及び異常摩耗検知手
段１８の各検知手段からの異常信号を基にして液ポンプ
回路の状態に異常がないか否かを判定している。When the cooling operation is performed by the liquid pump 8, the abnormality determining means 15 constantly monitors whether the cooling capacity is normal, that is, whether there is any abnormality in the state of the liquid pump circuit. Therefore, the abnormality determination unit 15 always determines whether or not there is an abnormality in the state of the liquid pump circuit based on the abnormality signals from the flow rate change detection unit 16, the current change detection unit 17, and the abnormal wear detection unit 18. Has been determined.
【００３４】もし、各検知手段の少なくとも一個所から
異常信号が出力されている場合には液ポンプ回路の状態
が異常であると判定され、液ポンプによる運転が行われ
ないように運転制御手段１４に液ポンプ異常指令を与え
る。更に、ユーザーに知らせる為に異常表示手段１９に
対しても同様に液ポンプ異常指令が与えられる。If an abnormal signal is output from at least one of the detecting means, it is determined that the state of the liquid pump circuit is abnormal, and the operation control means 14 is operated so that the operation by the liquid pump is not performed. To the liquid pump abnormality command. Further, a liquid pump abnormality command is similarly given to the abnormality display means 19 to inform the user.
【００３５】ここで、運転制御手段１４は、運転制御手
段１４からの液ポンプ異常指令を受けとると、すぐに液
ポンプによる運転から圧縮機３による運転に切り換え
る。Here, upon receiving the liquid pump abnormality command from the operation control means 14, the operation control means 14 immediately switches the operation from the liquid pump to the operation by the compressor 3.
【００３６】一方、異常表示手段１９は、同じく運転制
御手段１４からの液ポンプ異常指令を受け取ると、液ポ
ンプ８回路の状態が異常であることをユーザーに知らせ
るために、リモコンや液ポンプ８本体、あるいは遠隔監
視を行う保守管理システムにアラームやランプ点灯など
で液ポンプ異常を表示する。尚、異常表示手段１９は表
示する以外にも、音声やベルなどの音による通知でも構
わなく、即ちユーザーが液ポンプ回路の状態が異常であ
ることを認識できればユーザーへの通知方法は問わな
い。On the other hand, when the abnormality display means 19 receives the liquid pump abnormality command from the operation control means 14 as well, the abnormality display means 19 informs the user that the state of the circuit of the liquid pump 8 is abnormal. Or, display an abnormality of the liquid pump by an alarm or lamp lighting on a maintenance management system that performs remote monitoring. In addition to the display, the abnormality display means 19 may be a sound or a sound such as a bell, that is, a method of notifying the user as long as the user can recognize that the state of the liquid pump circuit is abnormal.
【００３７】次に、上述した各検知手段の動作について
説明する。まず、流量変化検知手段１６の動作について
説明する。通常、何らかの理由により液ポンプ８の運転
能力が低下すると、液ポンプ８からの吐出冷媒の流量が
減少する。即ち、流量値の変化を検知することにより液
ポンプ回路の運転状態を判断できる。Next, the operation of each detecting means described above will be described. First, the operation of the flow rate change detecting means 16 will be described. Normally, when the operating capacity of the liquid pump 8 decreases for some reason, the flow rate of the refrigerant discharged from the liquid pump 8 decreases. That is, the operating state of the liquid pump circuit can be determined by detecting a change in the flow rate value.
【００３８】尚、本実施の形態では、流量変化検知手段
１６の動作としては、流量計を用いて直接的に流量を求
める場合と温度検知手段を用いて間接的に流量を求める
場合、更に後者は室内熱交換器６内の熱交換後の空気の
温度変化から求める場合と室内熱交換器６による冷媒過
熱度から求める場合の計三通り説明するが、どの方法を
採用しても構わない。In the present embodiment, the operation of the flow rate change detecting means 16 includes the case where the flow rate is directly obtained by using a flow meter and the case where the flow rate is indirectly obtained by using a temperature detecting means. There will be described a total of three cases in which the temperature is obtained from the temperature change of the air after heat exchange in the indoor heat exchanger 6 and the case where the temperature is obtained from the degree of superheat of the refrigerant by the indoor heat exchanger 6, but any method may be adopted.
【００３９】まず、流量計を用いて直接的に流量を求め
る場合について説明する。まず、回路中の冷媒の流量を
流量計（図示せず）を用いて検知する。次に、検知した
流量値と液ポンプ８が正常運転されているときの正常時
流量値とを比較する。もし、検知した流量値が正常流量
値以下であれば液ポンプ回路の状態が異常であると判定
し、異常判定手段１５に異常信号を出力する。First, the case where the flow rate is directly obtained using a flow meter will be described. First, the flow rate of the refrigerant in the circuit is detected using a flow meter (not shown). Next, the detected flow value is compared with the normal flow value when the liquid pump 8 is operating normally. If the detected flow value is equal to or less than the normal flow value, it is determined that the state of the liquid pump circuit is abnormal, and an abnormality signal is output to the abnormality determination means 15.
【００４０】次に、温度検出手段を用いて間接的に流量
を求める場合、特に室内熱交換器６内の熱交換後の空気
の温度変化から求める場合について説明する。まず、流
量変化検知手段１６は、第３の温度検知手段２０ｃから
室内熱交換器中間温度を検知し、また、第２の温度検知
手段２０ｂより室内空気温度を検知する。また、流量変
化検知手段１６はこれらの温度と室内熱交換器６の熱交
換性能から、室内吹出し温度を推定する。Next, a case where the flow rate is indirectly obtained by using the temperature detecting means, particularly a case where the flow rate is obtained from a temperature change of the air after the heat exchange in the indoor heat exchanger 6 will be described. First, the flow rate change detecting means 16 detects the intermediate temperature of the indoor heat exchanger from the third temperature detecting means 20c, and detects the indoor air temperature from the second temperature detecting means 20b. Further, the flow rate change detecting means 16 estimates the indoor outlet temperature from these temperatures and the heat exchange performance of the indoor heat exchanger 6.
【００４１】次に、第５の温度検知手段２０ｅで室内吹
出し温度を検知する。ここで、先ほど推定した室内吹き
出し温度と比較する。この際、液ポンプ８が正常な流量
を吐出していれば推定された室内吹出し温度と第５の温
度検知手段２０ｅで検知される実際の室内吹出し温度と
の差異は僅かである。しかし、何らかの理由により液ポ
ンプ８に異常が生じ、吐出流量が低下している場合に
は、所望の空調能力が得られなくなり、結果として推定
された室内吹出し温度との差異が大きくなる。この差異
に基づいて液ポンプ８に異常が生じているかどうかを判
定する。即ち、冷媒の吐出流量を温度検知手段により室
内吹き出し温度の変化を検知することにより、間接的に
冷媒の吐出流量を求め、判定に用いるわけである。Next, the fifth temperature detecting means 20e detects the indoor air outlet temperature. Here, a comparison is made with the indoor blowing temperature estimated earlier. At this time, if the liquid pump 8 is discharging a normal flow rate, the difference between the estimated indoor outlet temperature and the actual indoor outlet temperature detected by the fifth temperature detecting means 20e is slight. However, when an abnormality occurs in the liquid pump 8 for some reason and the discharge flow rate is reduced, a desired air conditioning capacity cannot be obtained, and as a result, a difference from the estimated indoor air outlet temperature increases. Based on this difference, it is determined whether an abnormality has occurred in the liquid pump 8. In other words, the discharge flow rate of the refrigerant is detected indirectly by detecting the change in the indoor blowout temperature by the temperature detection means, and the discharge flow rate of the refrigerant is indirectly used for the determination.
【００４２】即ち、液ポンプ吐出流量があらかじめ決め
られた許容値を下回った際、流量変化検知手段１６は液
ポンプ回路の状態が異常であると判定し、異常判定手段
１５に異常信号を出力する。That is, when the discharge flow rate of the liquid pump falls below a predetermined allowable value, the flow rate change detecting means 16 determines that the state of the liquid pump circuit is abnormal, and outputs an abnormal signal to the abnormality determining means 15. .
【００４３】次に、温度検出手段を用いて間接的に流量
を求める場合、特に室内熱交換器６による冷媒過熱度か
ら流量を求める場合について説明する。まず、第３の温
度検知手段２０ｃ及び第２の温度検知手段２０ｂとで各
々室内熱交換器中間温度と室内空気温度を検知する。Next, a case where the flow rate is indirectly obtained by using the temperature detecting means, particularly a case where the flow rate is obtained from the degree of superheating of the refrigerant by the indoor heat exchanger 6 will be described. First, the third temperature detecting means 20c and the second temperature detecting means 20b detect the intermediate temperature of the indoor heat exchanger and the indoor air temperature, respectively.
【００４４】次に、検知された室内熱交換器中間温度と
室内空気温度とから液ポンプ８が正常流量を吐出してい
る場合における室内熱交換器６の出口における冷媒過熱
度（ＳＨ１）を推定する。次に、第４の温度検知手段２
０ｄにより室内熱交換器出口温度を検知し、先ほど検知
した室内熱交換器中間温度との温度差を求め、実際の冷
媒過熱度（ＳＨ２）を求める。Next, the degree of superheating of the refrigerant (SH1) at the outlet of the indoor heat exchanger 6 when the liquid pump 8 discharges a normal flow rate is estimated from the detected indoor heat exchanger intermediate temperature and the indoor air temperature. I do. Next, the fourth temperature detecting means 2
0d, the outlet temperature of the indoor heat exchanger is detected, the temperature difference from the intermediate temperature of the indoor heat exchanger detected earlier is obtained, and the actual refrigerant superheat degree (SH2) is obtained.
【００４５】ここで、もし液ポンプ８回路の状態が異常
であり、冷媒の流量が減少すると、室内熱交換器６内で
冷媒は室内の空気から通常より多く熱を受けることとな
り、その結果冷媒が通常よりも加熱され、結果的に蒸発
温度よりも高い過熱蒸気となる。即ち、ＳＨ２は冷媒の
流量によって変化する変数である。よって、これら推定
される冷媒過熱度ＳＨ１及び測定される実際の冷媒なけ
都度ＳＨ２から冷媒の流量を求めることもでき、このよ
うな方法を用いても良い。つまり、温度検知手段により
冷媒の温度の変化を検知することにより、間接的に冷媒
の吐出流量を求め、判定に用いるわけである。Here, if the state of the circuit of the liquid pump 8 is abnormal and the flow rate of the refrigerant decreases, the refrigerant receives more heat than usual in the indoor heat exchanger 6 from the indoor air. Is heated above normal, resulting in superheated steam above the evaporation temperature. That is, SH2 is a variable that changes according to the flow rate of the refrigerant. Therefore, the flow rate of the refrigerant can be obtained from the estimated refrigerant superheat degree SH1 and the measured actual refrigerant SH2 each time the refrigerant is not used, and such a method may be used. That is, by detecting a change in the temperature of the refrigerant by the temperature detecting means, the discharge flow rate of the refrigerant is indirectly obtained and used for the determination.
【００４６】次に、電流変化検知手段１７の動作につい
て説明する。まず、電流変化検知手段１７は、液ポンプ
入力電流を電流センサにより検知する。この入力電流と
は、液ポンプ８を作動させる為の電流であり、電流値が
低ければ吐出される冷媒が流量が減り、一方電流値が高
ければ吐出される冷媒の流量が増すことを意味してい
る。Next, the operation of the current change detecting means 17 will be described. First, the current change detecting means 17 detects a liquid pump input current by a current sensor. The input current is a current for operating the liquid pump 8, and the lower the current value, the lower the flow rate of the discharged refrigerant, while the higher the current value, the higher the flow rate of the discharged refrigerant. ing.
【００４７】次に、検知された電流値は、液ポンプ８が
正常動作している場合の電流値と比較される。ここで、
予め決められた許容値を上回る場合には液ポンプ８に過
大な負荷が生じている、液ポンプ８が所望の流量を吐出
する為に通常以上の電流を必要としているとして液ポン
プ回路の状態が異常であると判定し、異常判定手段１５
に異常信号を出力する。Next, the detected current value is compared with a current value when the liquid pump 8 is operating normally. here,
If the value exceeds a predetermined allowable value, an excessive load is applied to the liquid pump 8, and it is determined that the liquid pump 8 requires a current higher than usual to discharge a desired flow rate, and the state of the liquid pump circuit is determined. Abnormality is determined, and the abnormality determination means 15 is determined.
An abnormal signal is output to
【００４８】次に、異常摩耗検知手段１８の動作につい
て説明する。まず、圧力検知手段２１が冷媒を吐出する
液ポンプ８の吐出圧力を定期的に測定する。尚、フィル
タ９は正常な運転では設計寿命まで目詰まりによる圧力
損失が起こらない程度の有効面積を有している。しか
し、液ポンプ８内で異常摩耗が進行すると摩耗粉が冷媒
中に流れ込みフィルタ９によって捕捉され、同時にフィ
ルタ９が徐々に目詰まりを起こす。尚、このような状態
が続くと、徐々に圧力損失が増大し、それと共に液ポン
プ８の吐出圧力が増大していくことを補足しておく。つ
まり、液ポンプ８の摩耗の状態を摩耗粉の量、即ちフィ
ルターの目詰まりによる圧力損失の増加で間接的に検知
している。Next, the operation of the abnormal wear detecting means 18 will be described. First, the pressure detecting means 21 periodically measures the discharge pressure of the liquid pump 8 for discharging the refrigerant. Note that the filter 9 has an effective area that does not cause pressure loss due to clogging until the design life in a normal operation. However, when abnormal wear progresses in the liquid pump 8, wear powder flows into the refrigerant and is captured by the filter 9, and at the same time, the filter 9 gradually becomes clogged. Note that if such a state continues, the pressure loss gradually increases, and the discharge pressure of the liquid pump 8 increases accordingly. That is, the state of wear of the liquid pump 8 is indirectly detected based on the amount of wear powder, that is, an increase in pressure loss due to clogging of the filter.
【００４９】次に、圧力検知手段２１は、定期的に測定
している液ポンプ８の吐出圧力値が上昇し、予め決めら
れた異常と判断される所定値を超えると異常摩耗検知手
段１８に対してＯＮ信号を出力する。次に、異常摩耗検
知手段１８はＯＮ信号を受けると異常判定手段１５に対
して異常信号を出力する。Next, when the discharge pressure value of the liquid pump 8 which is periodically measured rises and exceeds a predetermined value which is determined to be a predetermined abnormality, the pressure detecting means 21 causes the abnormal wear detecting means 18 to operate. In response, an ON signal is output. Next, when the abnormal wear detecting means 18 receives the ON signal, it outputs an abnormal signal to the abnormality determining means 15.
【００５０】尚、本実施の形態では摩耗粉の量をフィル
ターの目詰まりによる圧力損失で間接的に求めたが、冷
媒中の摩耗粉の量を検知する装置で直接測定しても構わ
ない。In this embodiment, the amount of abrasion powder is indirectly determined by the pressure loss caused by clogging of the filter, but may be directly measured by a device for detecting the amount of abrasion powder in the refrigerant.
【００５１】また、実際の冷媒過熱度ＳＨ２＝０となる
ように流量を制御して運転しても良い。即ち、まず、液
ポンプ８の運転条件（液ポンプ入力電圧、液ポンプ周波
数）と液ポンプ８から吐出される冷媒の流量の関係を予
め調べておく。また、冷媒過熱度が０となるときの冷媒
の流量を算出しておく。即ち、これらから、冷媒過熱度
が０となるときの液ポンプ８の運転条件を把握してお
く。Further, the operation may be performed by controlling the flow rate so that the actual refrigerant superheat degree SH2 = 0. That is, first, the relationship between the operating conditions (liquid pump input voltage, liquid pump frequency) of the liquid pump 8 and the flow rate of the refrigerant discharged from the liquid pump 8 is checked in advance. Also, the flow rate of the refrigerant when the refrigerant superheat degree becomes 0 is calculated in advance. That is, the operating conditions of the liquid pump 8 when the degree of superheat of the refrigerant becomes 0 are grasped from these.
【００５２】次に、上述したように各温度検知手段から
ＳＨ２を求め、このＳＨ２の値が丁度０となるように冷
媒の流量を制御、即ち、液ポンプ８の運転条件を設定す
る。次に、先に把握していた冷媒過熱度０の時の液ポン
プ８の運転条件と実際にＳＨ２を０としたときの液ポン
プ８の運転条件とを比較する。もし、この条件が大きく
ずれるようであるなら、液ポンプ回路が異常であると判
断する。例えば、冷媒過熱度が０となるような冷媒の流
量が１００リットルであるにもかかわらず、液ポンプ入
力電圧や液ポンプ周波数が冷媒の流量１２０リットルに
相当するのであれば、液ポンプ８が通常よりも冷媒を吐
出していない為、液ポンプ８の運転条件が大きくずれ
た、即ち液ポンプ回路の状態が異常であるというように
異常の判断ができる。Next, as described above, SH2 is obtained from each temperature detecting means, and the flow rate of the refrigerant is controlled so that the value of SH2 becomes just 0, that is, the operating condition of the liquid pump 8 is set. Next, the operating condition of the liquid pump 8 when the degree of superheat of the refrigerant is 0, which was previously grasped, is compared with the operating condition of the liquid pump 8 when SH2 is actually set to 0. If this condition is deviated significantly, it is determined that the liquid pump circuit is abnormal. For example, if the liquid pump input voltage and the liquid pump frequency correspond to the refrigerant flow rate of 120 liters even though the refrigerant flow rate at which the refrigerant superheat degree becomes 0 is 100 liters, the liquid pump 8 is normally used. Since the refrigerant is not being discharged, the operating condition of the liquid pump 8 is largely shifted, that is, the state of the liquid pump circuit can be determined to be abnormal.
【００５３】尚、本実施の形態では圧縮機３と液ポンプ
８とが並列に接続された場合について説明したが、従来
例のように直列に接続した場合でも構わない。即ち、冷
媒の回路は圧縮機回路と液ポンプ回路とから構成され、
開閉弁等により圧縮機３と液ポンプ８とを切り換えるこ
とで各回路とも圧縮機３と液ポンプ８以外は共通化して
いればどのような回路でも構わない。In this embodiment, the case where the compressor 3 and the liquid pump 8 are connected in parallel has been described. However, the case where they are connected in series as in the conventional example may be used. That is, the refrigerant circuit is composed of a compressor circuit and a liquid pump circuit,
By switching between the compressor 3 and the liquid pump 8 using an on-off valve or the like, any circuit may be used as long as the circuits other than the compressor 3 and the liquid pump 8 are common to each circuit.
【００５４】尚、各検出手段において通常液ポンプ８が
異常と判定される基準としては、負荷トルク増大により
運転不可能となるか、或いは吐出流量が著しく低下して
空調不能となるか、ということが考えられる。しかし、
これに概しないレベルであっても、圧縮機サイクルに悪
影響を及ぼすと判定されるレベルで液ポンプ異常の判定
基準を設定しておけば、圧縮機３の保護が確実に行なわ
れる。The criterion for judging that the normal liquid pump 8 is abnormal in each detecting means is that the operation becomes impossible due to an increase in the load torque, or the discharge flow rate is remarkably reduced and the air conditioning is impossible. Can be considered. But,
Even if the level is not approximate to this level, if the criterion for determining the abnormality of the liquid pump is set at a level determined to have a bad influence on the compressor cycle, the protection of the compressor 3 is ensured.
【００５５】尚、液ポンプ８を、室内熱交換器６の出口
冷媒が数℃の過熱度をもつよう流量制御してもよい。こ
れによれば、室内熱交換器６から冷媒が吐出される際に
は完全に気体と化している為、即ち室内熱交換器６から
室外熱交換器４までの経路で冷媒が二相であることがな
い為に、冷媒充填量を小さくすることができる。The flow rate of the liquid pump 8 may be controlled so that the refrigerant at the outlet of the indoor heat exchanger 6 has a degree of superheating of several degrees Celsius. According to this, when the refrigerant is discharged from the indoor heat exchanger 6, the refrigerant is completely gasified, that is, the refrigerant is two-phase in the path from the indoor heat exchanger 6 to the outdoor heat exchanger 4. Since there is no such problem, the refrigerant charge amount can be reduced.
【００５６】このように、本実施の形態においては上述
した構成をしているので、液ポンプ回路の状態が異常で
あると判断された際に、液ポンプ８による運転から圧縮
機３による運転に切り換えているので、異物の噛み込み
などでモータの負荷トルクが異常に増大した場合に、電
流検知によって液ポンプ８を停止し、圧縮機運転モード
へと移行することができるので、液ポンプ８の入力電流
増大によるモータ焼損などの危険性を回避できる。As described above, in the present embodiment, the above-described configuration is employed, and when the state of the liquid pump circuit is determined to be abnormal, the operation by the liquid pump 8 is changed to the operation by the compressor 3. Since the switching is performed, when the load torque of the motor is abnormally increased due to, for example, a foreign object being caught, the liquid pump 8 can be stopped by the current detection, and the mode can be shifted to the compressor operation mode. Danger such as motor burnout due to an increase in input current can be avoided.
【００５７】また、摩耗が進行して体積効率が低下によ
り揚程がとれず冷媒流量が著しく低下した場合に、流量
低下検知によって液ポンプ８を停止し、圧縮機運転モー
ドへと移行するので、冷房能力低下による室温制御不能
状態が回避できる。Further, when the abrasion progresses and the volume efficiency drops, the head cannot be obtained due to the drop in volume efficiency, and the refrigerant flow rate drops significantly, the liquid pump 8 is stopped by detecting the flow rate drop and the operation mode shifts to the compressor operation mode. An uncontrollable state at room temperature due to a decrease in capacity can be avoided.
【００５８】更に、液ポンプ８の摩耗粉の吐出量を検知
し、一定量を超えると圧縮機運転に切り換えているの
で、液ポンプ８の異常摩耗が進行し、発生した摩耗粉が
回路中へ放出され、絞り装置５の閉塞による故障や、圧
縮機３内部への磨耗粉侵入等による圧縮機サイクルの故
障を回避できる。Further, the discharge amount of the abrasion powder from the liquid pump 8 is detected, and if it exceeds a certain amount, the operation is switched to the compressor, so that abnormal abrasion of the liquid pump 8 progresses, and the generated abrasion powder enters the circuit. The compressor 3 is discharged and can be prevented from malfunctioning due to blockage of the expansion device 5 or malfunctioning of the compressor cycle due to intrusion of wear powder into the compressor 3.
【００５９】また、温度検知手段を用いて液ポンプ回路
の状態を判断しているので、流量計を用いず温度検知手
段によって間接的に流量を求め、液ポンプ運転から圧縮
機運転に切り換えることができ、冷媒の回路を複雑化さ
せず、コスト削減を図ることができる。Also, since the state of the liquid pump circuit is determined using the temperature detecting means, the flow rate can be indirectly obtained by the temperature detecting means without using a flow meter, and the operation can be switched from the liquid pump operation to the compressor operation. Thus, cost can be reduced without complicating the refrigerant circuit.
【００６０】冷媒搬送手段として圧縮機３と液ポンプ８
双方を有する年間冷房用途の空気調和装置において、液
ポンプ８が異物の噛み込みなどでモータの負荷トルクが
異常に増大した場合、あるいは摩耗が進行して体積効率
が低下し、揚程がとれず冷媒流量が低下した場合に、液
ポンプ運転を停止し、圧縮機運転モードへと移行するの
で、ポンプ入力電流増大によるモータ焼損などの危険性
および冷房能力低下による室温制御不能状態が回避でき
る。The compressor 3 and the liquid pump 8 serve as refrigerant transport means.
In an air conditioner for annual cooling use having both of them, when the liquid pump 8 abnormally increases the load torque of the motor due to the bite of a foreign substance, or the wear progresses, the volume efficiency decreases, When the flow rate is reduced, the operation of the liquid pump is stopped and the operation mode is shifted to the compressor operation mode. Therefore, it is possible to avoid a danger such as motor burnout due to an increase in the pump input current and a state in which room temperature cannot be controlled due to a decrease in cooling capacity.
【００６１】また、液ポンプ８の異常が表示されるの
で、ユーザーが液ポンプ異常を認知でき、交換のタイミ
ングが容易に確認できる。Further, since the abnormality of the liquid pump 8 is displayed, the user can recognize the abnormality of the liquid pump and can easily confirm the replacement timing.
【００６２】また、圧縮機３と液ポンプ８とが並列に接
続されているので、絞り装置５の圧損がなくなる為、液
ポンプ８への負担が軽減される。Further, since the compressor 3 and the liquid pump 8 are connected in parallel, the pressure loss of the expansion device 5 is eliminated and the load on the liquid pump 8 is reduced.
【００６３】実施の形態２．次に、この発明の他の実施
の形態における空気調和装置、特に液ポンプ８の他の実
施の形態ついて説明する。図２は浸漬型渦流ポンプを複
数台液タンク内に設置した場合の構成図である。図にお
いて、８ａは浸漬型渦流ポンプ、８ｂは液タンクであ
る。尚、本実施の形態の全体の構成は図１と同様であ
る。Embodiment 2 Next, an air conditioner according to another embodiment of the present invention, in particular, another embodiment of the liquid pump 8 will be described. FIG. 2 is a configuration diagram when a plurality of immersion type vortex pumps are installed in a liquid tank. In the figure, reference numeral 8a denotes an immersion type vortex pump, and 8b denotes a liquid tank. The overall configuration of the present embodiment is the same as FIG.
【００６４】尚、本用途の空気調和装置は１日２４時間
連続運転であるため、圧縮機３、液ポンプ８ともに長寿
命化が要求される。しかし、液ポンプ８を油潤滑の圧縮
機３と同等レベルの寿命とすることは技術的に困難であ
る。その為、液ポンプ８若しくは浸漬型渦流ポンプ８ａ
が寿命と判断された場合には充填されている冷媒を排出
すること無しに液ポンプ８若しくは浸漬型渦流ポンプ８
ａ部分だけを容易に着脱、交換できるような構造として
いる。Since the air conditioner of this application is operated continuously for 24 hours a day, it is required that both the compressor 3 and the liquid pump 8 have long life. However, it is technically difficult to make the life of the liquid pump 8 equal to that of the oil-lubricated compressor 3. Therefore, the liquid pump 8 or the immersion type vortex pump 8a
Is determined to be the life, the liquid pump 8 or the immersion type vortex pump 8 is discharged without discharging the charged refrigerant.
The structure is such that only part a can be easily attached and detached and replaced.
【００６５】次に、動作について説明する。尚、液ポン
プ８は運転制御手段１４によって制御されていることは
上述した通りであるが、ここでは液ポンプ８への制御は
即ち各浸漬型渦流ポンプ８ａへの制御を意味する。Next, the operation will be described. Although the liquid pump 8 is controlled by the operation control means 14 as described above, control of the liquid pump 8 here means control of each immersion type vortex pump 8a.
【００６６】まず、少なくとも流量変化検知手段１６、
電流変化検知手段１７、異常摩耗検知手段１８のうちの
どれかから異常判定手段１５に異常信号を出力されるま
では実施の形態１と同様である。First, at least the flow rate change detecting means 16,
It is the same as that of the first embodiment until any one of the current change detecting means 17 and the abnormal wear detecting means 18 outputs an abnormal signal to the abnormal determining means 15.
【００６７】次に、異常判定手段１５は各種検知手段か
らの異常信号を受け取ると、現在運転中の液ポンプ８内
の浸漬型渦流ポンプ８ａの運転状態が異常であると判定
する。更に、運転制御手段１４は異常と判定された浸漬
型渦流ポンプ８ａへの電源供給を停止し、停止している
他の浸漬型渦流ポンプ８ａに対して電源供給を行う。即
ち、使用する浸漬型渦流ポンプ８ａを交換し、液ポンプ
８による運転を継続する。Next, when the abnormality determining means 15 receives an abnormal signal from the various detecting means, it determines that the operating state of the immersion type vortex pump 8a in the liquid pump 8 which is currently operating is abnormal. Further, the operation control means 14 stops the power supply to the immersion type vortex pump 8a determined to be abnormal, and supplies the power to the other stopped immersion type vortex pump 8a. That is, the immersion type vortex pump 8a to be used is replaced, and the operation by the liquid pump 8 is continued.
【００６８】しかし、交換する浸漬型渦流ポンプ８ａが
無い場合には、液ポンプ８の継続運転が不可能と判断
し、運転制御手段１４に液ポンプ異常指令を与える。更
に、ユーザーに知らせる為に異常表示手段１９に対して
も同様に液ポンプ異常指令が与えられる。この後の動作
は実施の形態１と同様である。However, when there is no immersion type vortex pump 8a to be replaced, it is determined that the continuous operation of the liquid pump 8 is impossible, and a liquid pump abnormality command is given to the operation control means 14. Further, a liquid pump abnormality command is similarly given to the abnormality display means 19 to inform the user. The subsequent operation is the same as in the first embodiment.
【００６９】尚、本実施の形態においては液ポンプ８内
に複数の浸漬型渦流ポンプ８ａを用意しておいたが、液
ポンプ８自体を複数個設置し、浸漬型渦流ポンプ８ａを
交換した要領で液ポンプ８を交換する構成でも構わな
い。In the present embodiment, a plurality of immersion type vortex pumps 8a are prepared in the liquid pump 8, but a plurality of immersion type vortex pumps 8 are provided, and the procedure for replacing the immersion type vortex pump 8a is as follows. A configuration in which the liquid pump 8 is replaced with a liquid may be used.
【００７０】このように、液ポンプ８内に複数の浸漬型
渦流ポンプ８ａを用意しておき、適宜浸漬型渦流ポンプ
８ａを交換することにより、１台当りの液ポンプ寿命が
比較的短い場合においても所定の寿命の液ポンプユニッ
トとすることができる。また、浸漬型渦流ポンプ８ａが
故障した際に、冷媒を漏らすこと無く交換することがで
きる。As described above, a plurality of immersion type vortex pumps 8a are prepared in the liquid pump 8, and the immersion type vortex pumps 8a are appropriately replaced. Can also be a liquid pump unit having a predetermined life. Further, when the immersion type vortex pump 8a breaks down, it can be replaced without leaking the refrigerant.
【００７１】実施の形態３．本実施の形態において、実
施の形態１と同一の符号を付した箇所は同一または相当
部分を示す。図３は、この発明の他の実施の形態におけ
る、空気調和装置を示すブロック構成図であり、特に、
暖房運転による空調を行う空気調和装置を示したもので
ある。図において、２０ｆは第４の温度検知手段２０ｄ
と対向する位置、即ち室内熱交換器６の下流側の出口の
位置に設けられ室内熱交換器６から吐出される冷媒の温
度を測定する第６の温度検知手段、２２は四方弁、２３
は液ポンプ８の吐出側に設けられ、灯油などの燃焼器に
より冷媒を加熱する冷媒加熱器、２４及び２５は液ポン
プ８及び冷媒加熱器２３を挟むように設けられた第１及
び第２の開閉弁である。Embodiment 3 In the present embodiment, portions denoted by the same reference numerals as those in Embodiment 1 indicate the same or corresponding portions. FIG. 3 is a block diagram showing an air conditioner according to another embodiment of the present invention.
1 shows an air conditioner that performs air conditioning by heating operation. In the figure, 20f is a fourth temperature detecting means 20d.
A sixth temperature detecting means provided at a position opposite to the above, that is, at a position of an outlet on the downstream side of the indoor heat exchanger 6 to measure the temperature of the refrigerant discharged from the indoor heat exchanger 6;
Is a refrigerant heater that is provided on the discharge side of the liquid pump 8 and heats the refrigerant by a combustor such as kerosene, and 24 and 25 are a first and a second that are provided so as to sandwich the liquid pump 8 and the refrigerant heater 23. It is an on-off valve.
【００７２】本実施の形態における冷媒の回路は、暖房
時において冷媒が、圧縮機３、四方弁２２、室内熱交換
器６、絞り装置５、室外熱交換器４、四方弁２２、アキ
ュムレータ７の順に流れるような閉回路に、更に室内熱
交換器６に対して並列になるように第１の開閉弁２４、
液ポンプ８、加熱器２３、第２の開閉弁２５が接続され
た構成をしている。In the refrigerant circuit of the present embodiment, the refrigerant is supplied to the compressor 3, the four-way valve 22, the indoor heat exchanger 6, the expansion device 5, the outdoor heat exchanger 4, the four-way valve 22, and the accumulator 7 during heating. The first on-off valve 24 is arranged so as to be in parallel with the indoor heat exchanger 6 in a closed circuit that flows sequentially.
The liquid pump 8, the heater 23, and the second on-off valve 25 are connected.
【００７３】また、圧縮機回路は、第１の開閉弁２４及
び第２の開閉弁２５を共に閉止し、絞り装置５を開放し
た際に、圧縮機３、室内熱交換器６、絞り装置５、室外
熱交換器４、アキュムレータ７の回路として形成され
る。一方、液ポンプ回路は、第１の開閉弁２４及び第２
の開閉弁２５を共に開放し、絞り装置５を閉止した際
に、室外熱交換器４、圧縮機３、四方弁２２をバイパス
し、液ポンプ８、冷媒加熱装置２３、室内熱交換器６の
回路として形成される。When the compressor circuit is closed and the throttle valve 5 is opened, the compressor 3, the indoor heat exchanger 6, and the throttle device 5 are closed. , The outdoor heat exchanger 4 and the accumulator 7. On the other hand, the liquid pump circuit includes the first on-off valve 24 and the second
When the on-off valve 25 is opened and the expansion device 5 is closed, the outdoor heat exchanger 4, the compressor 3, and the four-way valve 22 are bypassed, and the liquid pump 8, the refrigerant heating device 23, and the indoor heat exchanger 6 Formed as a circuit.
【００７４】尚、図３において、第６の温度検知手段２
０ｆ以外の各温度検知手段と制御装置１３とを結ぶ線は
図１と同様であり、本実施の形態において使用しない各
温度検知手段は図の煩雑を避ける為省略している。ま
た、運転制御手段１４は圧縮機３、液ポンプ８、第１及
び第２の開閉弁２５、２６、冷媒加熱器２３、四方弁２
２と夫々制御する為に接続されている。In FIG. 3, the sixth temperature detecting means 2
The lines connecting the temperature detecting means other than 0f and the control device 13 are the same as those in FIG. 1, and the temperature detecting means not used in the present embodiment are omitted to avoid complication of the drawing. The operation control means 14 includes the compressor 3, the liquid pump 8, the first and second on-off valves 25 and 26, the refrigerant heater 23, the four-way valve 2
2 are connected to control each other.
【００７５】次に、動作について説明する。 （１）圧縮機による暖房運転 この場合には、圧縮機回路が選択され圧縮機運転による
暖房運転が行われる。まず、暖房運転を開始すると、リ
モコンなどの入力装置から運転制御手段１４に対して暖
房運転の指令が伝わる。Next, the operation will be described. (1) Heating operation by compressor In this case, the compressor circuit is selected and the heating operation by compressor operation is performed. First, when the heating operation is started, a heating operation command is transmitted to the operation control means 14 from an input device such as a remote controller.
【００７６】次に、運転制御手段１４が第１及び第２の
開閉弁２４、２５を閉止し、一方絞り装置５を開放す
る。更に、四方弁２２を切り換えることにより、圧縮機
３、室外熱交換器４、絞り装置５、室内熱交換器６、ア
キュムレータ７という循環路、即ち圧縮機回路が構成さ
れる。Next, the operation control means 14 closes the first and second on-off valves 24 and 25 and opens the expansion device 5. Further, by switching the four-way valve 22, a circulation path of the compressor 3, the outdoor heat exchanger 4, the expansion device 5, the indoor heat exchanger 6, and the accumulator 7, that is, a compressor circuit is formed.
【００７７】次に、冷媒の回路が構成されると運転制御
手段１４により圧縮機３を運転させる。尚、この際すで
に液ポンプ８の運転が行われている場合は、液ポンプ８
の運転を終了させた後、圧縮機３の運転、即ち通常のヒ
ートポンプ暖房運転を開始させる。Next, when the refrigerant circuit is constructed, the compressor 3 is operated by the operation control means 14. In this case, if the operation of the liquid pump 8 has already been performed,
, The operation of the compressor 3, that is, the normal heat pump heating operation is started.
【００７８】（２）液ポンプによる暖房運転 この場合には、液ポンプ回路が選択され液ポンプ運転に
よる暖房運転が行われる。まず、暖房運転を開始する
と、リモコンなどの入力装置から運転制御手段１４に対
して暖房運転の指令が伝わる。次に、運転制御手段１４
は暖房運転の指令を受け取ると、第１の開閉弁２４、第
２の開閉弁２５を開放し、絞り装置５を閉止させて液ポ
ンプ回路を選択する。(2) Heating operation by liquid pump In this case, the liquid pump circuit is selected and the heating operation by the liquid pump operation is performed. First, when the heating operation is started, a heating operation command is transmitted to the operation control means 14 from an input device such as a remote controller. Next, the operation control means 14
Receives the heating operation command, opens the first opening / closing valve 24 and the second opening / closing valve 25, closes the expansion device 5, and selects the liquid pump circuit.
【００７９】次に、運転制御手段１４は液ポンプ８及び
冷媒加熱器２３を動作させる。そうすると、液ポンプ８
から吐出された液冷媒は冷媒加熱器２３を通って高温の
ガス冷媒となる。この高温ガス冷媒は、室内熱交換器６
へと流入し、室内空気と熱交換して凝縮して液冷媒とな
る。この際、冷媒ガスの熱を受け取った空気によって室
内の空気が暖められることとなる。その後、液冷媒は再
び液ポンプ８へ吸引される。Next, the operation control means 14 operates the liquid pump 8 and the refrigerant heater 23. Then, the liquid pump 8
The liquid refrigerant discharged from the refrigerant passes through the refrigerant heater 23 to become a high-temperature gas refrigerant. This high-temperature gas refrigerant is supplied to the indoor heat exchanger 6.
And exchanges heat with indoor air to condense into liquid refrigerant. At this time, the room air is heated by the air that has received the heat of the refrigerant gas. Thereafter, the liquid refrigerant is sucked into the liquid pump 8 again.
【００８０】尚、この液ポンプ暖房運転時の機器制御
は、室内暖房負荷、すなわち目標室温（設定温度）と実
際の室内の空気の温度との温度差に応じて冷媒加熱器２
３の燃焼量が制御される。また、液ポンプ８は、液ポン
プ吸引が確実に液冷媒となるように、液ポンプ吐出流量
が制御される。The equipment control during the liquid pump heating operation is performed by controlling the refrigerant heater 2 according to the room heating load, that is, the temperature difference between the target room temperature (set temperature) and the actual room air temperature.
3 is controlled. In addition, the liquid pump 8 controls the discharge flow rate of the liquid pump so that the suction of the liquid pump becomes the liquid refrigerant without fail.
【００８１】ここで、液ポンプ運転中は実施の形態１と
同様に液ポンプ回路に異常が生じているか否かを常時監
視している。即ち、異常判定手段１５は各種検知手段か
ら異常信号が出力されているか判断し、出力されている
場合には、圧縮機回路による運転に切り換える。尚、各
種検出手段のうち、電流変化検知手段１７、異常摩耗検
知手段１８は実施の形態１と同様の動作を行う。Here, during operation of the liquid pump, whether or not an abnormality has occurred in the liquid pump circuit is constantly monitored as in the first embodiment. That is, the abnormality determination unit 15 determines whether an abnormality signal is output from the various detection units, and when the abnormality signal is output, switches to operation by the compressor circuit. In addition, among the various detecting means, the current change detecting means 17 and the abnormal wear detecting means 18 perform the same operation as in the first embodiment.
【００８２】更に、流量変化検知手段１６が、流量計を
用いて直接液ポンプ８からの冷媒の吐出流量を求める動
作についても実施の形態１と同様である。よって、実施
の形態１と一部異なる、即ち、流量変化検知手段１６
が、温度検知手段を用いて間接的に冷媒の流量を求める
動作についてのみ説明する。Further, the operation in which the flow rate change detecting means 16 directly calculates the discharge flow rate of the refrigerant from the liquid pump 8 using the flow meter is the same as in the first embodiment. Therefore, it is partially different from the first embodiment.
However, only the operation of indirectly obtaining the flow rate of the refrigerant using the temperature detecting means will be described.
【００８３】まず、予め、液ポンプ入力電圧値、液ポン
プ周波数値等の運転条件と冷媒の流量とを対応づけてお
く。即ち、液ポンプ８の運転条件は運転制御手段１４か
らの制御信号によって設定している為、液ポンプ８に出
力される制御信号と回路を流れる冷媒の流量との対応づ
けと等価である。First, the operating conditions such as the liquid pump input voltage value and the liquid pump frequency value are associated with the refrigerant flow rate in advance. That is, since the operating condition of the liquid pump 8 is set by the control signal from the operation control means 14, it is equivalent to associating the control signal output to the liquid pump 8 with the flow rate of the refrigerant flowing through the circuit.
【００８４】次に、運転制御手段１４から冷媒加熱器２
３への制御信号から暖房能力に相当する冷媒加熱器２３
の燃焼量を推定する。更に、現在の液ポンプ８に対し出
力されている制御信号から回路を流れている冷媒の流量
を推定する。次に、推定された冷媒加熱器２３の燃焼量
と推定された制御信号通りの流量から加熱器２３の入口
及び出口のエンタルピ差を推定する。Next, the operation control means 14 sends the refrigerant heater 2
From the control signal to the refrigerant heater 23 corresponding to the heating capacity
Estimate the amount of combustion. Further, the flow rate of the refrigerant flowing through the circuit is estimated from the control signal currently output to the liquid pump 8. Next, the enthalpy difference between the inlet and the outlet of the heater 23 is estimated from the estimated combustion amount of the refrigerant heater 23 and the flow rate according to the estimated control signal.
【００８５】次に、実際に回路を流れている冷媒の室内
熱交換器６前後におけるエンタルピー差を測定する。こ
のエンタルピー差は、第４及び第６の温度検出手段２０
ｄ、２０ｆとから実際に測定される冷媒の温度から算出
することができる。Next, the enthalpy difference of the refrigerant actually flowing in the circuit before and after the indoor heat exchanger 6 is measured. This enthalpy difference is determined by the fourth and sixth temperature detecting means 20.
d and 20f can be calculated from the refrigerant temperature actually measured.
【００８６】次に、推定されたエンタルピー差と実測さ
れたエンタルピー差とを比較する。もし、液ポンプ８が
正常に運転している場合、この差異は僅かである。しか
し、何らかの理由により液ポンプ８に異常が生じ、吐出
流量が低下している場合には、所望の空調能力が得られ
なくなり、結果として差異は大きくなる。この差異に基
づいて液ポンプ８に異常が生じているかどうかを判定す
る。Next, the estimated enthalpy difference is compared with the actually measured enthalpy difference. If the liquid pump 8 is operating normally, this difference is slight. However, if an abnormality occurs in the liquid pump 8 for some reason and the discharge flow rate is reduced, a desired air conditioning capacity cannot be obtained, and as a result, the difference increases. Based on this difference, it is determined whether an abnormality has occurred in the liquid pump 8.
【００８７】次に、異常判定手段１５は異常信号を受け
取ると、液ポンプ回路の状態は異常であると判断する。
そうすると、運転制御手段１４は、第１及び第２の開閉
弁及び四方弁２２を制御し、圧縮機回路を選択し、上述
したヒートポンプ暖房運転を行う。Next, upon receiving the abnormality signal, the abnormality determining means 15 determines that the state of the liquid pump circuit is abnormal.
Then, the operation control means 14 controls the first and second on-off valves and the four-way valve 22, selects the compressor circuit, and performs the above-described heat pump heating operation.
【００８８】このように、本実施の形態においては上述
した構成をしているので、液ポンプ８が停止しても圧縮
機３によってヒートポンプ暖房運転を行うことができる
ので、被空調空間の環境が悪化することがない。As described above, since the present embodiment has the above-described configuration, the heat pump heating operation can be performed by the compressor 3 even when the liquid pump 8 is stopped. It does not get worse.
【００８９】また、異物の噛み込みなどでモータの負荷
トルクが異常に増大した場合に、電流検知によって液ポ
ンプ８を停止し、圧縮機運転モードへと移行するので、
ポンプ入力電流増大によるモータ焼損などの危険性を回
避できる。Further, when the load torque of the motor is abnormally increased due to foreign matter being caught or the like, the liquid pump 8 is stopped by the current detection, and the mode shifts to the compressor operation mode.
Danger such as motor burnout due to an increase in pump input current can be avoided.
【００９０】更に、本実施の形態では、液ポンプ８の摩
耗粉の吐出量を検知し、一定量を超えると圧縮機運転に
切り換えているので、異常摩耗が進行し、発生した摩耗
粉が回路中へ放出されるという状況を考えると、絞り装
置の閉塞による故障や、圧縮機３内部への磨耗粉侵入に
よる圧縮機サイクルの故障をも回避できる。Further, in the present embodiment, the discharge amount of the wear powder from the liquid pump 8 is detected, and if the discharge amount exceeds a certain amount, the operation is switched to the compressor operation. Considering the situation of being discharged into the inside, it is possible to avoid a failure due to blockage of the expansion device and a failure of the compressor cycle due to intrusion of wear powder into the compressor 3.
【００９１】また、冷媒搬送手段として圧縮機３と液ポ
ンプ８双方を有し、冷媒加熱器２３による暖房運転を行
う空気調和装置においても、前記と同様の効果が得られ
るとともに、液ポンプ８に不具合が生じた際には圧縮機
３による暖房運転を行うので、暖房機能が失われること
がなく、快適な環境を維持できる。Further, an air conditioner having both the compressor 3 and the liquid pump 8 as the refrigerant conveying means and performing a heating operation by the refrigerant heater 23 can obtain the same effect as described above, and When a malfunction occurs, the heating operation by the compressor 3 is performed, so that a comfortable environment can be maintained without losing the heating function.
【００９２】実施の形態４．本実施の形態において、実
施の形態１と同一の符号を付した箇所は同一または相当
部分を示す。図４は、この発明の他の実施の形態におけ
る、空気調和装置を示すブロック構成図であり、特に、
夜間電力などを用いた場合による冷房運転を行う空気調
和装置を示したものである。図において、５ａ〜５ｃは
後述する各室内熱交換器６ａ〜６ｃの上流側である液ポ
ンプ８側に各々設けた絞り装置、６ａ〜６ｃは実施の形
態１と同等の室内熱交換器、３１は後述する蓄熱槽３
２、第１及び第２の開閉弁３３、３４、液ポンプ８によ
り構成された蓄熱ユニット、３２は液ポンプ８の冷媒を
吸引する側に設けられた蓄熱槽、３３及び３４は蓄熱槽
３２及び液ポンプ８を挟むように設けられた第１及び第
２の開閉弁、３５は蓄熱槽３２中の伝熱管中間に設置さ
れた第７の温度検出手段、３６は蓄熱槽３２中の伝熱管
の液ポンプ８側吐出口に設けられた第８の温度検出手段
である。Embodiment 4 FIG. In the present embodiment, portions denoted by the same reference numerals as those in Embodiment 1 indicate the same or corresponding portions. FIG. 4 is a block diagram showing an air conditioner according to another embodiment of the present invention.
1 illustrates an air conditioner that performs a cooling operation when nighttime electric power or the like is used. In the figure, 5a to 5c are throttle devices provided on the liquid pump 8 side, which is upstream of the indoor heat exchangers 6a to 6c to be described later, 6a to 6c are indoor heat exchangers equivalent to those in the first embodiment, 31 Is a heat storage tank 3 described later
2, a heat storage unit constituted by first and second opening / closing valves 33 and 34 and a liquid pump 8, 32 is a heat storage tank provided on the side of the liquid pump 8 on which refrigerant is sucked, and 33 and 34 are heat storage tanks 32 and First and second opening / closing valves provided so as to sandwich the liquid pump 8, a reference numeral 35 denotes seventh temperature detecting means provided in the middle of the heat transfer tube in the heat storage tank 32, and a reference numeral 36 denotes a heat transfer tube in the heat storage tank 32. This is an eighth temperature detecting means provided at the discharge port on the liquid pump 8 side.
【００９３】本実施の形態における冷媒の回路は、冷房
時において冷媒が、圧縮機３、四方弁２２、室外熱交換
器４、室外側の絞り装置５、室内側の絞り装置５ａから
５ｃ、室内熱交換器６ａ〜６ｃ、四方弁２２、アキュム
レータ７の順に流れるような閉回路に、更に室内ユニッ
ト２と室外ユニット１の間に室内熱交換器６ａ〜６ｃに
対して並列になるように第１の開閉弁３３、蓄熱槽３
２、液ポンプ８、第２の開閉弁３４を接続した構成をし
ている。In the refrigerant circuit of this embodiment, during cooling, the refrigerant is supplied to the compressor 3, the four-way valve 22, the outdoor heat exchanger 4, the outdoor expansion device 5, the indoor expansion devices 5a to 5c, and the indoor. The first heat exchangers 6a to 6c, the four-way valve 22, and the accumulator 7 are arranged in a closed circuit such that the first heat exchangers 6a to 6c are arranged in parallel with the indoor heat exchangers 6a to 6c between the indoor unit 2 and the outdoor unit 1. On-off valve 33, heat storage tank 3
2, the liquid pump 8 and the second on-off valve 34 are connected.
【００９４】また、圧縮機回路は、第１の開閉弁３３及
び第２の開閉弁３４を共に閉止し、室外側の絞り装置
５、室内側の絞り装置５ａ〜５ｃを開放した際に、圧縮
機３、室外熱交換器４、絞り装置５、室内熱交換器６ａ
〜６ｃ、アキュムレータ７の回路として形成される。一
方、液ポンプ回路は、第１の開閉弁３３及び第２の開閉
弁３４を共に閉止し、室外側の絞り装置５、室内側の絞
り装置５ａ〜５ｃを開放した場合、即ち、室外熱交換器
４、圧縮機３、四方弁２２をバイパスし、液ポンプ８、
室内熱交換器６ａ〜６ｃ、蓄熱槽３２を循環する回路と
して形成される。The compressor circuit closes both the first opening / closing valve 33 and the second opening / closing valve 34, and when the outdoor throttle device 5 and the indoor throttle devices 5a to 5c are opened, the compressor circuit is compressed. Unit 3, outdoor heat exchanger 4, expansion device 5, indoor heat exchanger 6a
6c, the circuit of the accumulator 7 is formed. On the other hand, the liquid pump circuit closes both the first opening / closing valve 33 and the second opening / closing valve 34 and opens the outdoor-side expansion device 5 and the indoor-side expansion devices 5a to 5c, that is, outdoor heat exchange. , The compressor 3, the four-way valve 22 and the liquid pump 8,
It is formed as a circuit that circulates through the indoor heat exchangers 6 a to 6 c and the heat storage tank 32.
【００９５】尚、図４において、第７及び第８の温度検
知手段３５、３６以外の各温度検知手段と制御手段１３
とを結ぶ線は図１と同様であり、本実施の形態において
使用しない各温度検出手段は、図の煩雑を避ける為省略
している。また、運転制御手段１４は圧縮機３、液ポン
プ８、第１及び第２の開閉弁３３、３４、絞り装置５ａ
〜５ｃと夫々制御する為に接続されている。In FIG. 4, each temperature detecting means other than the seventh and eighth temperature detecting means 35 and 36 and the control means 13
1 are the same as in FIG. 1, and the temperature detecting means not used in the present embodiment are omitted to avoid complication of the drawing. The operation control means 14 includes the compressor 3, the liquid pump 8, the first and second opening / closing valves 33 and 34, the throttle device 5a.
To 5c are connected for control.
【００９６】（１）圧縮機による冷房運転 この場合には、圧縮機回路が選択され圧縮機運転が行わ
れる。まず、運転制御手段１４が、第１及び第２の開閉
弁３３、３４を閉止し、室外側の絞り装置５を開放す
る。この後の動作は実施の形態１若しくは実施の形態２
と同様なので説明は省略する。(1) Cooling operation by compressor In this case, the compressor circuit is selected and the compressor operation is performed. First, the operation control means 14 closes the first and second on-off valves 33 and 34 and opens the outdoor-side throttle device 5. The subsequent operation is performed according to the first or second embodiment.
Therefore, the description is omitted.
【００９７】（２）液ポンプによる冷房運転 この場合には、液ポンプ回路が選択され液ポンプ運転に
よる暖房運転が行われる。まず、蓄熱槽３２は夜間電力
等を用いて冷水や氷を蓄える。次に、この蓄えられた熱
量を取り出す放熱運転を行う。この際、運転制御手段１
４は、第１及び第２の開閉弁３３、３４を開放し、室外
側の絞り装置５を閉止し、液ポンプ回路を形成する。(2) Cooling operation by liquid pump In this case, the liquid pump circuit is selected and the heating operation by the liquid pump operation is performed. First, the heat storage tank 32 stores cold water and ice using electric power at night. Next, a radiating operation for extracting the stored amount of heat is performed. At this time, the operation control means 1
Reference numeral 4 opens the first and second on-off valves 33 and 34, closes the outdoor throttle device 5, and forms a liquid pump circuit.
【００９８】次に、液ポンプ８を作動させる。これによ
り、蓄熱槽３２にて凝縮した液冷媒が循環することとな
る。即ち、液ポンプ８から吐出された液冷媒は、各室内
熱交換器６ａ〜６ｃの入口に設置された室内側絞り装置
５ａ〜５ｃを通って室内熱交換器６ａ〜６ｃに流入し、
室内空気と熱交換してガス冷媒となる。そのガス冷媒は
蓄熱槽３２に流入し、予め貯えられた冷熱によって凝縮
し、液冷媒となって再び液ポンプ８に吸引される。Next, the liquid pump 8 is operated. As a result, the liquid refrigerant condensed in the heat storage tank 32 circulates. That is, the liquid refrigerant discharged from the liquid pump 8 flows into the indoor heat exchangers 6a to 6c through the indoor expansion devices 5a to 5c installed at the inlets of the indoor heat exchangers 6a to 6c,
It exchanges heat with indoor air to become a gas refrigerant. The gas refrigerant flows into the heat storage tank 32, is condensed by the cold stored in advance, becomes a liquid refrigerant, and is sucked by the liquid pump 8 again.
【００９９】ここで、複数の室内熱交換器６ａ〜６ｃに
はそれぞれの能力に見合った冷媒流量を得るため、室内
側絞り装置５ａ〜５ｃが設置されており、これらはそれ
ぞれの冷媒流量が適正に、例えば室内熱交換器出口冷媒
の乾き度がちょうど１になるように制御されている。Here, the indoor heat exchangers 6a to 6c are provided with indoor expansion devices 5a to 5c in order to obtain a refrigerant flow rate corresponding to each capacity. In addition, for example, the dryness of the refrigerant at the outlet of the indoor heat exchanger is controlled to be exactly 1.
【０１００】この時、液ポンプ運転中は実施の形態１と
同様に液ポンプ回路の異常が生じているか否かを常時監
視している。即ち、異常判定手段１５は各種検知手段か
ら異常信号が出力されているか判断し、出力されている
場合には、圧縮機回路による運転に切り換える。尚、各
種検出手段のうち、電流変化検知手段１７、異常摩耗検
知手段１８は実施の形態１と同様の動作を行う。At this time, during the operation of the liquid pump, whether or not an abnormality has occurred in the liquid pump circuit is constantly monitored as in the first embodiment. That is, the abnormality determination unit 15 determines whether an abnormality signal is output from the various detection units, and when the abnormality signal is output, switches to operation by the compressor circuit. In addition, among the various detecting means, the current change detecting means 17 and the abnormal wear detecting means 18 perform the same operation as in the first embodiment.
【０１０１】更に、流量変化検知手段１６が、流量計を
用いて直接液ポンプ８からの冷媒の吐出流量を求める動
作についても実施の形態１と同様である。よって、実施
の形態１と異なる、即ち、流量変化検知手段１６が、温
度検知手段を用いて間接的に冷媒の流量を求める動作に
ついてのみ説明する。尚、動作としては室内熱交換器６
ａ〜６ｃにおける冷媒の温度変化から流量を求める場合
と蓄熱槽３２における冷媒の温度変化から流量を求める
場合の二通り説明するが、どちらの方法を採用しても構
わない。Further, the operation in which the flow rate change detecting means 16 directly calculates the discharge flow rate of the refrigerant from the liquid pump 8 using the flow meter is the same as in the first embodiment. Therefore, only the operation different from the first embodiment, that is, the operation in which the flow rate change detecting means 16 indirectly obtains the flow rate of the refrigerant using the temperature detecting means will be described. The operation is performed by the indoor heat exchanger 6.
Two cases will be described, that is, the case where the flow rate is obtained from the change in the temperature of the refrigerant in a to 6c and the case where the flow rate is obtained from the change in the temperature of the refrigerant in the heat storage tank 32.
【０１０２】まず、室内熱交換器６ａ〜６ｃにおける冷
媒の温度変化から流量を求める場合について説明する。
もし、液ポンプ８に異常が生じ、要求された流量を吐出
できなくなると、室内が絞り装置５ａ〜５ｃを全開にし
ても熱交換器６ａ〜６ｃの出口冷媒は過熱してしまい、
乾き度１前後の状態に制御不可能となる。この時、ま
ず、第３の温度検知手段２０ｃから室内熱交換器６ａ〜
６ｃ内の冷媒の蒸発温度、即ち室内熱交換器中間温度を
検知する。First, the case where the flow rate is obtained from the temperature change of the refrigerant in the indoor heat exchangers 6a to 6c will be described.
If an abnormality occurs in the liquid pump 8 and the requested flow rate cannot be discharged, the outlet refrigerants of the heat exchangers 6a to 6c are overheated even when the throttle devices 5a to 5c are fully opened in the room,
It becomes impossible to control the dryness to around 1. At this time, first, from the third temperature detecting means 20c, the indoor heat exchangers 6a to 6a
The evaporating temperature of the refrigerant in 6c, that is, the intermediate temperature of the indoor heat exchanger is detected.
【０１０３】次に、第４の温度検知手段２０ｄによって
室内熱交換器６ａ〜６ｃの出口における冷媒の温度、即
ち室内熱交換器出口温度を検知する。次に、流量変化検
知手段１６は、これら室内熱交換器中間温度と室内熱交
換器出口温度とを読み取り、冷媒の過熱度と求める。こ
の状況を検知して、その過熱度が許容値としての所定の
値以上となった場合に異常判定手段１５に対して異常信
号を出力する。Next, the temperature of the refrigerant at the outlets of the indoor heat exchangers 6a to 6c, that is, the outlet temperature of the indoor heat exchanger, is detected by the fourth temperature detecting means 20d. Next, the flow rate change detecting means 16 reads the intermediate temperature of the indoor heat exchanger and the outlet temperature of the indoor heat exchanger to determine the degree of superheat of the refrigerant. This condition is detected, and an abnormal signal is output to the abnormality determining means 15 when the degree of superheat becomes equal to or more than a predetermined value as an allowable value.
【０１０４】次に、異常判定手段１５により液ポンプ回
路の状態が異常であると判定されると、運転制御手段１
４は第１及び第２の開閉弁３３、３４を閉止し、圧縮機
３、室外熱交換器４、室外側絞り装置５、室内熱交換器
６ａ〜６ｃ、アキュムレータ７のように循環する経路を
形成して圧縮機３を運転する。この後の動作は実施の形
態１と同様なので説明は省略する。Next, when the abnormality determination means 15 determines that the state of the liquid pump circuit is abnormal, the operation control means 1
4 closes the first and second on-off valves 33 and 34, and circulates a path like the compressor 3, the outdoor heat exchanger 4, the outdoor expansion device 5, the indoor heat exchangers 6a to 6c, and the accumulator 7. Then, the compressor 3 is operated. The subsequent operation is the same as in the first embodiment, and a description thereof will be omitted.
【０１０５】まず、室内熱交換器６ａ〜６ｃにおける冷
媒の温度変化から流量を求める場合について説明する。
まず、蓄熱槽３２中の伝熱管中間に設置された第７の温
度検出手段３５によって冷媒の凝縮温度である中間温度
を検知しする。また、液ポンプ吸引側に設置された第８
の温度検出手段３６によって液冷媒の温度を検知する。
次に、流量変化検知手段１６は、検知された各温度の温
度差から液ポンプ吸引冷媒の過冷却度を演算する。ここ
で、もし液ポンプ回路に異常が生じ、冷媒の流量が減少
したとすると、冷媒が通常よりも長い時間をかけて蓄熱
槽３２を通過することとなる。つまり、冷媒は通常以上
に冷却される。よって、この過冷却度は冷媒流量が低下
すると増大する傾向にあり、冷媒の流量の算出に使用で
きる。つまり、この過冷却度に許容値を設定しておき、
それを目安にすれば良いことは明らかである。次に、流
量変化検知手段１６は、算出した過冷却度と設定してお
いた許容値とを比較し、許容値より大きいか否かで流量
の判断を行う。First, the case where the flow rate is obtained from the change in the temperature of the refrigerant in the indoor heat exchangers 6a to 6c will be described.
First, an intermediate temperature, which is the condensation temperature of the refrigerant, is detected by the seventh temperature detecting means 35 provided in the heat storage tank 32 between the heat transfer tubes. Also, the eighth pump installed on the suction side of the liquid pump
The temperature of the liquid refrigerant is detected by the temperature detecting means 36.
Next, the flow rate change detecting means 16 calculates the degree of supercooling of the liquid pump suction refrigerant from the detected temperature difference between the temperatures. Here, if an abnormality occurs in the liquid pump circuit and the flow rate of the refrigerant decreases, the refrigerant passes through the heat storage tank 32 over a longer time than usual. That is, the refrigerant is cooled more than usual. Therefore, the degree of supercooling tends to increase as the flow rate of the refrigerant decreases, and can be used for calculating the flow rate of the refrigerant. In other words, an allowable value is set for this degree of supercooling,
It is clear that we can use that as a guide. Next, the flow rate change detecting unit 16 compares the calculated degree of supercooling with the set allowable value, and determines the flow rate based on whether the degree is larger than the allowable value.
【０１０６】尚、本実施の形態において、液ポンプ８を
熱交換器出口冷媒の乾き度がちょうど１になるように制
御していたが、複数の室内ユニット２のうち、稼働中で
ある室内ユニット２の合計容量から必要流量を演算し、
それとなるよう吐出流量を制御しても良い。In the present embodiment, the liquid pump 8 is controlled so that the dryness of the refrigerant at the outlet of the heat exchanger is exactly one. Calculate the required flow rate from the total capacity of 2,
The discharge flow rate may be controlled to achieve this.
【０１０７】このように、本実施の形態においては上述
した構成をしているので、液ポンプ８が停止しても圧縮
機３によってヒートポンプ冷房運転を行うことができる
ので、被空調空間の環境が悪化することがない。また、
異物の噛み込みなどでモータの負荷トルクが異常に増大
した場合に、電流検知によって液ポンプ８を停止し、圧
縮機運転モードへと移行するので、ポンプ入力電流増大
によるモータ焼損などの危険性を回避できる。As described above, in the present embodiment, since the above-described configuration is used, the heat pump cooling operation can be performed by the compressor 3 even when the liquid pump 8 is stopped. It does not get worse. Also,
When the load torque of the motor is abnormally increased due to foreign matter being caught, etc., the liquid pump 8 is stopped by the current detection and the operation mode is shifted to the compressor operation mode. Can be avoided.
【０１０８】更に、本実施の形態では、液ポンプ８の摩
耗粉の吐出量を検知し、一定量を超えると圧縮機運転に
切り換えているので、異常摩耗が進行し、発生した摩耗
粉が回路中へ放出されるという状況を考えると、絞り装
置の閉塞による故障や、圧縮機３内部への磨耗粉侵入に
よる圧縮機サイクルの故障をも回避できる。Further, in this embodiment, since the discharge amount of the wear powder from the liquid pump 8 is detected, and if the discharge amount exceeds a certain amount, the operation is switched to the compressor operation. Considering the situation of being discharged into the inside, it is possible to avoid a failure due to blockage of the expansion device and a failure of the compressor cycle due to intrusion of wear powder into the compressor 3.
【０１０９】また、特別な部品の追加なしに信頼性が向
上し、また、液ポンプ８の故障が発生しても交換は液ポ
ンプユニットのみであり、他の部品を交換する必要がな
いため、リサイクル性が向上する。Further, the reliability is improved without adding any special parts, and even if a failure of the liquid pump 8 occurs, only the liquid pump unit is replaced and there is no need to replace other parts. Recyclability is improved.
【０１１０】また、冷媒搬送手段として圧縮機３と液ポ
ンプ８双方を有する蓄熱型空気調和装置において、液ポ
ンプ８によって放熱運転を行う際にも前記と同様の効果
が得られる。In the heat storage type air conditioner having both the compressor 3 and the liquid pump 8 as the refrigerant conveying means, the same effect as described above can be obtained when the liquid pump 8 performs the heat radiation operation.
【０１１１】[0111]
【発明の効果】以上のように、本発明によれば、第１の
発明に係る空気調和装置は、圧縮機、凝縮器、絞り装置
及び蒸発器を接続した圧縮機回路と、液ポンプ、前記凝
縮器、前記蒸発器を接続した液ポンプ回路とから構成さ
れる空気調和装置において、前記圧縮機回路若しくは前
記液ポンプ回路を選択する回路選択手段と、前記液ポン
プの運転状況を検知する液ポンプ運転検知手段と、前記
液ポンプ運転検知手段の検知結果を基にして前記回路選
択手段を制御し、前記液ポンプ回路異常が生じた場合
に、電流検知によって液ポンプ８を停止し、圧縮機運転
モードへと移行することができる。As described above, according to the present invention, the air conditioner according to the first aspect of the present invention includes a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, a liquid pump, In an air conditioner comprising a condenser and a liquid pump circuit connected to the evaporator, a circuit selecting means for selecting the compressor circuit or the liquid pump circuit, and a liquid pump for detecting an operation state of the liquid pump The circuit selection means is controlled based on the operation detection means and the detection result of the liquid pump operation detection means, and when the liquid pump circuit abnormality occurs, the liquid pump 8 is stopped by current detection and the compressor operation is started. Mode.
【０１１２】第２の発明に係る空気調和装置は、第１の
発明において前記液ポンプ運転検知手段が、前記液ポン
プから吐出される冷媒の流量を検知する流量変化検知手
段と、前記液ポンプへの入力電流値を検知する電流変化
検知手段と、前記液ポンプから吐出される摩耗粉の量を
検知する異常摩耗検知手段とのうち少なくとも１つ以上
から構成されるので、液ポンプ回路に異常が生じた場合
に、電流検知によって液ポンプ８を停止し、圧縮機運転
モードへと移行することができる。An air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect, wherein the liquid pump operation detecting means includes a flow rate change detecting means for detecting a flow rate of the refrigerant discharged from the liquid pump; And at least one of abnormal wear detecting means for detecting the amount of abrasion powder discharged from the liquid pump. When this occurs, the liquid pump 8 is stopped by the current detection, and the mode can be shifted to the compressor operation mode.
【０１１３】第３の発明に係る空気調和装置は、圧縮
機、凝縮器、絞り装置及び蒸発器を接続した圧縮機回路
と、液ポンプ、前記凝縮器、前記蒸発器を接続した液ポ
ンプ回路とから構成される空気調和装置において、前記
圧縮機回路若しくは前記液ポンプ回路を選択する回路選
択手段と、冷媒と周囲の空気との間で熱交換を行う前記
蒸発器にて熱交換された周囲の空気の温度を検知する温
度検出手段と、前記液ポンプの運転状況を検知する液ポ
ンプ運転検知手段と、前記液ポンプ前記温度検知手段の
検知結果を基にして前記回路選択手段を制御し、前記液
ポンプ回路から前記圧縮機回路に切り替える運転制御手
段とを備え、前記温度検知手段は、前記熱交換された空
気の温度と所定の温度とを比較し、この比較結果から流
量を検知するので、流量計などを用いず流量を間接的に
求めることができる。An air conditioner according to a third aspect of the present invention includes a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, and a liquid pump circuit connecting a liquid pump, the condenser, and the evaporator. In the air conditioner, the circuit selection means for selecting the compressor circuit or the liquid pump circuit, and the surrounding heat exchanged by the evaporator that performs heat exchange between refrigerant and surrounding air A temperature detecting means for detecting a temperature of the air, a liquid pump operation detecting means for detecting an operation state of the liquid pump, and controlling the circuit selecting means based on a detection result of the temperature detecting means for the liquid pump; Operation control means for switching from the liquid pump circuit to the compressor circuit, the temperature detection means compares the temperature of the heat exchanged air with a predetermined temperature, and detects the flow rate from the comparison result, Flow rate without using a quantity meter can be indirectly determined.
【０１１４】第４の発明に係る空気調和装置は、圧縮
機、凝縮器、絞り装置及び蒸発器を接続した圧縮機回路
と、液ポンプ、前記凝縮器、前記蒸発器を接続した液ポ
ンプ回路とから構成される空気調和装置において、前記
圧縮機回路若しくは前記液ポンプ回路を選択する回路選
択手段と、冷媒と周囲の空気との間で熱交換を行う前記
蒸発器にて熱交換された冷媒の温度を検知する温度検知
手段と、前記温度検知手段で検知された冷媒の温度と所
定の温度とを比較して前記回路選択手段を制御し、前記
液ポンプ回路から前記圧縮機回路に切り替える運転制御
手段とを備えたので、流量計を用いず温度検知手段によ
って間接的に流量を求め、液ポンプ運転から圧縮機運転
に切り換えることができる。An air conditioner according to a fourth aspect of the present invention comprises a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, and a liquid pump circuit connecting the liquid pump, the condenser, and the evaporator. In the air conditioner comprising: a circuit selecting means for selecting the compressor circuit or the liquid pump circuit, and the refrigerant heat exchanged in the evaporator that performs heat exchange between the refrigerant and the surrounding air Temperature detection means for detecting the temperature, operation control for comparing the temperature of the refrigerant detected by the temperature detection means with a predetermined temperature, controlling the circuit selection means, and switching from the liquid pump circuit to the compressor circuit Means, the flow rate can be obtained indirectly by the temperature detecting means without using the flow meter, and the operation can be switched from the liquid pump operation to the compressor operation.
【０１１５】第５の発明に係る空気調和装置は、第４の
発明において前記所定の温度が、前記蒸発器の中間温度
であるので、流量計を用いず温度検知手段によって間接
的に流量を求め、液ポンプ運転から圧縮機運転に切り換
えることができる。In the air conditioner according to the fifth invention, in the fourth invention, since the predetermined temperature is an intermediate temperature of the evaporator, the flow rate is indirectly obtained by temperature detecting means without using a flow meter. The operation can be switched from the liquid pump operation to the compressor operation.
【０１１６】第６の発明に係る空気調和装置は、圧縮
機、凝縮器、絞り装置及び蒸発器を接続した圧縮機回路
と、液ポンプ、前記凝縮器、前記蒸発器を接続した液ポ
ンプ回路とから構成される空気調和装置において、前記
液ポンプ回路内の前記液ポンプの吐出口に設けられ、前
記液ポンプから吐出される前記冷媒中の異物を捕捉する
フィルタと、前記液ポンプと前記フィルタとの間に設け
られ、前記液ポンプから吐出される圧力値を検知する圧
力検知手段と、前記圧縮機回路若しくは前記液ポンプ回
路を選択する回路選択手段と、前記圧力検知手段により
検出された圧力値に基にして前記回路選択手段を制御
し、前記液ポンプ回路から前記圧縮機回路に切り替える
運転制御手段とを備えたので、液ポンプの異常摩耗が進
行し、発生した摩耗粉が回路中へ放出され、絞り装置の
閉塞による故障や、圧縮機３内部への磨耗粉侵入等によ
る圧縮機サイクルの故障を回避できる。An air conditioner according to a sixth aspect of the present invention includes a compressor circuit connecting a compressor, a condenser, a throttle device, and an evaporator, and a liquid pump circuit connecting a liquid pump, the condenser, and the evaporator. In the air conditioner composed of: a filter provided at a discharge port of the liquid pump in the liquid pump circuit, for capturing foreign matter in the refrigerant discharged from the liquid pump, the liquid pump and the filter A pressure detecting means for detecting a pressure value discharged from the liquid pump, a circuit selecting means for selecting the compressor circuit or the liquid pump circuit, and a pressure value detected by the pressure detecting means. Operation control means for controlling the circuit selecting means on the basis of the liquid pump circuit and switching from the liquid pump circuit to the compressor circuit. It is released into the circuit, failure or due to blockage of the throttling device, a failure of the compressor cycles due to wear dust intrusion or the like of the compressor 3 to the inside can be avoided.
【０１１７】第７の発明に係る空気調和装置は、第１乃
至第６の発明において、前記液ポンプが、浸漬型の渦流
ポンプを液タンク８ｂ内に複数台搭載して構成されるの
で、１台当りの液ポンプ寿命が比較的短い場合において
も所定の寿命の液ポンプユニットとすることができる。The air conditioner according to a seventh aspect of the present invention is the air conditioner according to the first to sixth aspects, wherein the liquid pump is configured by mounting a plurality of immersion type vortex pumps in the liquid tank 8b. Even when the liquid pump life per unit is relatively short, a liquid pump unit having a predetermined life can be obtained.
【０１１８】第８の発明に係る空気調和装置は、第１乃
至第６の発明において、前記液ポンプが、着脱可能な構
造であるので、液ポンプが故障した際に、冷媒を漏らす
こと無く交換することができる。In the air conditioner according to an eighth aspect of the present invention, in the first to sixth aspects, since the liquid pump has a detachable structure, when the liquid pump breaks down, it can be replaced without leaking refrigerant. can do.
【図１】 この発明の実施の形態１の空気調和装置のブ
ロック構成図。FIG. 1 is a block diagram of an air conditioner according to Embodiment 1 of the present invention.
【図２】 この発明の実施の形態１の液ポンプの構成
図。FIG. 2 is a configuration diagram of a liquid pump according to the first embodiment of the present invention.
【図３】 この発明の実施の形態２の空気調和装置のブ
ロック構成図。FIG. 3 is a block diagram of an air conditioner according to Embodiment 2 of the present invention.
【図４】 この発明の実施の形態３の空気調和装置のブ
ロック構成図。FIG. 4 is a block diagram of an air conditioner according to Embodiment 3 of the present invention.
【図５】 従来の技術における空気調和装置の冷媒の回
路図。FIG. 5 is a circuit diagram of a refrigerant of an air conditioner according to the related art.
１ 室外ユニット、２ 室内ユニット、３ 圧縮機、４
凝縮器（室外熱交換器）、５、５ａ〜５ｃ 絞り装
置、６、６ａ〜６ｃ 蒸発器（室内熱交換器）、７アキ
ュムレータ、８ 液ポンプ、８ａ 浸漬型渦流ポンプ、
８ｂ 液タンク、９ フィルタ、１０ 逆止弁、１１
圧縮機側開閉弁、１２ 液ポンプ側開閉弁、１３ 制御
装置、１４ 運転制御手段、１５ 異常判定手段、１６
流量変化検知手段、１７ 電流変化検知手段、１８
異常摩耗検知手段、１９ 異常表示手段、２０ａ、２０
ｂ、２０ｃ、２０ｄ、２０ｅ、２０ｆ 第１〜第６の温
度検知手段、２１ 圧力検知手段、２２ 四方弁、２３
冷媒加熱器、２４〜２５第１〜第２の開閉弁、３１
蓄熱ユニット、３２ 蓄熱槽、３３〜３４ 第１〜第２
の開閉弁、３５〜３６ 第７〜第８温度検出手段、４
１、４２、４３ 第１〜第３の開閉弁。1 outdoor unit, 2 indoor unit, 3 compressor, 4
Condenser (outdoor heat exchanger), 5, 5a-5c expansion device, 6, 6a-6c evaporator (indoor heat exchanger), 7 accumulator, 8 liquid pump, 8a immersion vortex pump,
8b liquid tank, 9 filter, 10 check valve, 11
Compressor-side on-off valve, 12 fluid pump-side on-off valve, 13 control device, 14 operation control means, 15 abnormality determination means, 16
Flow rate change detecting means, 17 Current change detecting means, 18
Abnormal wear detection means, 19 abnormal display means, 20a, 20
b, 20c, 20d, 20e, 20f first to sixth temperature detecting means, 21 pressure detecting means, 22 four-way valve, 23
Refrigerant heater, 24-25 first and second on-off valves, 31
Thermal storage unit, 32 Thermal storage tank, 33-34 First and second
On-off valve, 35-36 seventh-eighth temperature detecting means, 4
1, 42, 43 First to third on-off valves.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000083678AJP2001263835A (en) | 2000-03-24 | 2000-03-24 | Air conditioner |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000083678AJP2001263835A (en) | 2000-03-24 | 2000-03-24 | Air conditioner |
| Publication Number | Publication Date |
|---|---|
| JP2001263835Atrue JP2001263835A (en) | 2001-09-26 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000083678APendingJP2001263835A (en) | 2000-03-24 | 2000-03-24 | Air conditioner |
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| JP (1) | JP2001263835A (en) |
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| Date | Code | Title | Description |
|---|---|---|---|
| RD01 | Notification of change of attorney | Free format text:JAPANESE INTERMEDIATE CODE: A7421 Effective date:20040722 |