【０００１】[0001]
【産業上の利用分野】本発明は、単一の室外ユニットに
複数の室内ユニットを接続してなる空気調和機の凍結防
止装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freezing prevention device for an air conditioner in which a plurality of indoor units are connected to a single outdoor unit.
【０００２】[0002]
【従来の技術】従来、この種の凍結防止装置として、例
えば特開昭５８−１４８３７４号公報に記載のものが知
られている。この凍結防止装置は、圧縮機,凝縮器とし
て働く室外熱交換器,共通膨張弁を有する単一の室外ユ
ニットに、蒸発器として働く室内熱交換器とファンをも
つ複数の室内ユニットを各室用膨張弁を介して並列に接
続して冷凍回路を構成してなる。そして、各室内熱交換
器に接触して室内熱交温度センサを設け、この室内熱交
温度センサの検出する温度が所定値以下になったとき
に、圧縮機の運転を停止して、室内熱交換器の凍結を防
止するようになっている。2. Description of the Related Art Conventionally, as an antifreezing device of this type, for example, a device described in Japanese Patent Application Laid-Open No. 58-148374 is known. This anti-freezing device consists of a single outdoor unit having a compressor, an outdoor heat exchanger acting as a condenser and a common expansion valve, and a plurality of indoor units having an indoor heat exchanger acting as an evaporator and a fan for each room. A refrigeration circuit is configured by connecting in parallel via an expansion valve. An indoor heat exchange temperature sensor is provided in contact with each indoor heat exchanger, and when the temperature detected by the indoor heat exchange temperature sensor falls below a predetermined value, the operation of the compressor is stopped and the indoor heat exchange temperature is reduced. The exchanger is prevented from freezing.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記従来の
凍結防止装置は、電源スイッチがオンにされた運転室の
室内熱交換器のみについてしか上記凍結防止動作を行な
わないため、据え付けの際に配管や配線の誤接続があっ
たり、停止室の各室用膨張弁に閉鎖不良がある場合、凍
結防止策の対象外の停止室のファンの止まった室内熱交
換器に低温の冷媒が流れ続けて、運転条件によっては、
室内熱交換器が凍結するという問題がある。ここで、誤
配管,誤配線のチェックは、据え付け後の試運転で行な
うように指導されてはいるが、現実には指導が徹底して
いない。そのため、室内熱交換器が凍結する結果、フィ
ンチューブが破損するのみならず、氷片が室内ユニット
の吸込口等から室内へ落下して、壁紙やじゅうたんなど
を汚し、ユーザに迷惑をかけるとともに、メーカも修理
責任を負って労力と費用を浪費することになる。However, the above-mentioned conventional anti-freezing device performs the above-mentioned anti-freezing operation only on the indoor heat exchanger of the cab in which the power switch is turned on, so that the piping is not installed when installing. If there is a misconnection of wiring or wiring, or if the expansion valve for each room in the stop room is not properly closed, low-temperature refrigerant continues to flow through the indoor heat exchanger where the fan in the stop room, which is not subject to freeze prevention measures, is stopped. , Depending on driving conditions,
There is a problem that the indoor heat exchanger freezes. Here, it is instructed to check for erroneous piping and erroneous wiring in a trial run after installation, but in reality, the instruction is not thorough. Therefore, as a result of the freezing of the indoor heat exchanger, not only the fin tubes are damaged, but also ice pieces fall into the room from the inlet of the indoor unit or the like, and stain the wallpaper or carpet, causing trouble for the user, Manufacturers are also responsible for repairs, wasting effort and money.
【０００４】そこで、本発明の目的は、停止室の室内熱
交換器の温度などに基づいて停止室の冷媒循環異常を判
定し、判定結果に基づき圧縮機を停止等することによっ
て、誤配管,誤配線やごみの挾み込みによる各室用膨張
弁の閉鎖不良があっても、総ての室の室内熱交換器の凍
結を確実に防止することができる空気調和機の凍結防止
装置を提供することにある。Accordingly, an object of the present invention is to determine a refrigerant circulation abnormality in a stop chamber based on the temperature of an indoor heat exchanger in the stop chamber and to stop the compressor based on the determination result, thereby making an incorrect piping, Provide an air conditioner freezing prevention device that can reliably prevent the indoor heat exchangers from freezing in all rooms even if the expansion valves for each room are poorly closed due to incorrect wiring or dust trapping. Is to do.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成する為、
本発明の空気調和機の第１の凍結防止装置は、図１,図
２に例示するように、圧縮機２,室外熱交換器４を有す
る室外ユニット１に、室内熱交温度センサ１１が設けら
れた室内熱交換器１０とファンと室温センサ１２を有す
る複数の室内ユニット９a〜９dを、各室用膨張弁７a〜
７dを介して並列に接続してなる空気調和機において、
上記各室内ユニット９a〜９dからの運転信号によって、
運転されている室の数mが１か２以上かを判断する運転
室数判断手段Ｓ１,Ｓ２と、この運転室数判断手段Ｓ１,
Ｓ２が運転されている室の数mが１と判断したとき、運
転されている室の室温センサ１２と室内熱交温度センサ
１１の検出信号に基づき、圧縮機起動から所定時間t1経
過後に両検出信号の表わす温度差(Ｄa−Ｄc)が一定値α
以下か否かを判断し、肯と判断した室の番号を運転異常
室として判断して記憶する運転異常判断手段Ｓ４,Ｓ５
と、上記運転室数判断手段Ｓ１,Ｓ２が運転されている
室の数mが１と判断したとき、運転信号のない運転され
ていない室の室温センサ１２と室内熱交温度センサ１１
の検出信号に基づき、圧縮機起動から所定時間t1経過後
に両検出信号の表わす温度差(Ｄa−Ｄc)が一定値β以上
か否かを判断し、肯と判断した室の番号を停止異常室と
して判断して記憶する共に、上記停止異常室の室数を累
計する第１停止異常判断手段Ｓ６,Ｓ７と、上記第１停
止異常判断手段Ｓ６,Ｓ７が累計した室数が１のとき、
１つの運転異常室と１つの停止異常室の各室用膨張弁７
を全閉させる第１運転停止手段Ｓ９を備えたことを特徴
とする。In order to achieve the above object,
As shown in FIGS. 1 and 2, in the first freeze prevention device for an air conditioner of the present invention, an indoor heat exchange temperature sensor 11 is provided in an outdoor unit 1 having a compressor 2 and an outdoor heat exchanger 4. A plurality of indoor units 9a to 9d having the indoor heat exchanger 10, the fan, and the room temperature sensor 12 are connected to the expansion valves 7a to 7d for the respective rooms.
In an air conditioner connected in parallel via 7d,
According to the operation signals from the indoor units 9a to 9d,
The number of operating cab determining means S1 and S2 for determining whether the number m of operated cabs is 1 or more than 2;
When S2 is the number m of chambers is in operation is determined that 1, based on the detection signal of the temperature sensor 12 of the chamber being operated indoor heat exchange temperature sensor 11, both from the compressor starts after a predetermined time t1 has elapsed The temperature difference (Da−Dc) represented by the detection signal is a constant value α.
The operation abnormality determining means S4, S5 which determines whether or not the following is true, and stores the number of the room determined to be positive as an abnormal operation room and stores it.
When the number m of operating rooms is determined to be 1 by the operating room number determining means S1 and S2, the room temperature sensor 12 and the indoor heat exchange temperature sensor 11 of the non-operating room having no operation signal are provided.
The basis of the detection signal, the temperature difference represented by the two detection signals from the compressor starts after a predetermined time t1 has elapsed (Da-Dc) it is determined whether more than a predetermined value beta, the abnormal stop number of chambers is determined that affirmative The first stop abnormality determination means S6, S7 for determining and storing the room as the room and accumulating the number of rooms of the abnormal stop room, and the number of rooms accumulated by the first stop abnormality determination means S6, S7 is 1,
Expansion valve 7 for each chamber of one abnormal operation chamber and one abnormal stop chamber
Is provided with a first operation stopping means S9 for fully closing the valve.
【０００６】また、本発明の第２の凍結防止装置は、図
１,図３に例示するように、上述の空気調和機におい
て、上記各室内ユニット９a〜９dからの運転信号によっ
て、運転されていない室を検知する停止室検知手段Ｓ１
１と、この停止室検知手段Ｓ１１が、運転されていない
と検知した室の室温センサ１２と室内熱交温度センサ１
１の検出信号に基づき、両検出信号の表わす温度差(Ｄa
−Ｄc)が所定時間t2継続して一定値β以上で、かつ室内
熱交温度センサ１１の検出信号の表わす温度Ｄcが一定
値γ以下であるか否かを判断する第２停止異常判断手段
Ｓ１２と、この第２停止異常判断手段Ｓ１２が肯と判断
したとき、上記圧縮機２を停止させる第２運転停止手段
Ｓ１３を備えたことを特徴とする。さらに、上記第２の
凍結防止装置において、図４に例示するように、上記第
２停止異常判断手段Ｓ２２が最初に肯と判断したとき、
その停止異常の停止室の各室用膨張弁７を,一旦全開さ
せてから全閉させる弁開閉手段Ｓ２３をさらに備えると
ともに、この弁開閉手段Ｓ２３による弁の開閉操作に続
いて、上記第２停止異常判断手段Ｓ２２に再び判断を行
なわせ、この手段が再び肯と判断Ｓ２４したときに初め
て、上記第２運転停止手段Ｓ２５をして、上記圧縮機２
を停止せしめるようにしてもよい。As shown in FIGS. 1 and 3, the second freeze prevention device of the present invention is operated in the above-described air conditioner by operation signals from the indoor units 9a to 9d. Stop room detecting means S1 for detecting an empty room
1 and the room temperature sensor 12 and the indoor heat exchange temperature sensor 1 of the room in which the stop room detecting means S11 detects that it is not operating.
1, the temperature difference (Da
-Dc) is at a predetermined time t2 continued to a constant value β or more, and a second stop abnormality determination means for temperature Dc representing the detection signal of the indoor heat exchange temperature sensor 11 is equal to or less than a predetermined value γ S12 and a second operation stopping means S13 for stopping the compressor 2 when the second stop abnormality determining means S12 determines affirmative. Further, in the second anti-freezing device, as illustrated in FIG. 4, when the second stop abnormality determination means S22 first determines positive,
The apparatus further includes a valve opening / closing means S23 for once opening and fully closing the expansion valve 7 for each chamber of the stop chamber having the stop abnormality, and following the valve opening / closing operation by the valve opening / closing means S23, the second stop. Only when the abnormality determining means S22 makes a determination again, and when this means makes a positive determination again at S24, the second operation stopping means S25 is executed and the compressor 2
May be stopped.
【０００７】[0007]
【作用】請求項１に記載の凍結防止装置において、運転
室数判断手段Ｓ１,Ｓ２は、各室内ユニット９a〜９dか
らの運転信号の有無によって、その室が運転されている
か否かおよび運転されている室(「運転室」 と称す。)の数
mが１か２以上かを判断する。この運転室数判断手段Ｓ
１,Ｓ２が１と判断すると、運転異常判断手段Ｓ４,Ｓ５
は、運転室の室温センサ１２と室内熱交温度センサ１１
の検出信号に基づき、圧縮機起動から所定時間t1経過後
に両検出信号の表わす温度差(Ｄa−Ｄc)が一定値α以下
か否かを判断し、肯と判断すると、運転されているにも
拘わらず上記温度差が小さいので運転異常として、その
室の番号を記憶する。また、第１停止異常判断手段Ｓ
６,Ｓ７は、上記運転室数判断手段Ｓ１,Ｓ２が１と判断
すると、運転されていない室(「停止室」 と称す。)の室温
センサ１２と室内熱交温度センサ１１の検出信号に基づ
き、圧縮機起動から所定時間t1経過後に両検出信号の表
わす温度差（Ｄa−Ｄc)が一定値β以上か否かを判断
し、肯と判断すると、停止しているにも拘わらず上記温
度差が大きいので停止異常として、その室の番号を記憶
し、室数を累計する。According to the first aspect of the present invention, the number of cabs determining means S1 and S2 is determined based on the presence or absence of an operation signal from each of the indoor units 9a to 9d to determine whether or not the cab is being operated. Number of rooms (called "cab")
It is determined whether m is 1 or more. This cab number determination means S
If it is determined that S1, S2 is 1, the operation abnormality determination means S4, S5
Are the room temperature sensor 12 and the indoor heat exchange temperature sensor 11
Based on the detection signal, the temperature difference represented by the two detection signals from the compressor starts after a predetermined time t1 has elapsed (Da-Dc) is determined whether a predetermined value or less alpha, determines that affirmation, the being operated Nevertheless, since the temperature difference is small, the number of the room is stored as an operation abnormality. Further, the first stop abnormality determining means S
6, S7, based on the detection signals of the room temperature sensor 12 and the indoor heat exchange temperature sensor 11 of the non-operated room (referred to as "stop room") when the number of operating cabs determining means S1, S2 determines that it is 1. , the temperature difference representing the two detection signals from the compressor starts after a predetermined time t1 has elapsed (Da-Dc) it is determined whether more than a predetermined value beta, if it is determined that affirmation, the temperature despite the stop Since the difference is large, the number of the room is stored as a stop abnormality and the number of rooms is accumulated.
【０００８】次に、第１運転停止手段Ｓ９は、第１停止
異常判断手段Ｓ６,Ｓ７が累計した室数が１のとき、１
対の室内ユニット相互間の誤配管,誤配線の可能性が高
いとして、当該一対の運転異常室と停止異常室の各室用
膨張弁７を全閉させる。これによって、１室運転下で、
誤配管,誤配線および各室用膨張弁の閉鎖不良いずれの
場合も、ファンの止まった室内ユニット９の室内熱交換
器１０には、低温の冷媒が流れることがなく、室内熱交
換器の凍結が確実に防止される。[0008] Next, the first operation stopping means S9 determines whether or not the number of rooms accumulated by the first stop abnormality determining means S6 and S7 is one.
It is determined that there is a high possibility of erroneous piping and erroneous wiring between the pair of indoor units, and the expansion valves 7 for the respective rooms of the pair of abnormal operation chambers and the abnormal stop chamber are fully closed. As a result, under one-room operation,
In all cases of erroneous piping, erroneous wiring, and improper closing of the expansion valve for each room, low-temperature refrigerant does not flow through the indoor heat exchanger 10 of the indoor unit 9 where the fan has stopped, and the indoor heat exchanger freezes. Is reliably prevented.
【０００９】また、請求項２に記載の凍結防止装置にお
いて、停止室検知手段Ｓ１１は、各室内ユニット９a〜
９dからの運転信号によって、運転されていない室( 「停
止室」と称す。)を検知する。第２停止異常判断手段Ｓ１
２は、停止室の室温センサ１２と室内熱交温度センサ１
１の検出信号に基づき、両検出信号の表わす温度差(Da
−Ｄc)が所定時間t2継続して一定値β以上で、かつ室内
熱交温度センサ１１の検出信号の表わす温度Ｄcが一定
値γ以下であるか否かを判断する。そして、この第２停
止異常判断手段Ｓ１２が肯と判断すると、多室運転下
で、停止室にも拘わらず、継続して上記温度差が大き
く,かつ室内熱交換器の温度が低いので、誤配管,誤配線
または各室用膨張弁の閉鎖不良で冷媒が流れているとし
て、圧縮機２を停止させる。これによって、多室運転下
で、誤配管,誤配線および各室用膨張弁の閉鎖不良があ
っても、ファンの止まった室内ユニット９の室内熱交換
器１０には、低温の冷媒が流れることがなく、室内熱交
換器の凍結が確実に防止される。Further, in the freeze prevention device according to the second aspect, the stop room detecting means S11 is provided for each of the indoor units 9a to 9c.
An unoperated room (referred to as a "stop room") is detected based on the operation signal from 9d. Second stop abnormality determination means S1
2 is a room temperature sensor 12 for the stop room and a room heat exchange temperature sensor 1
1 based on the detected signal, the temperature difference (Da
-Dc) is at a predetermined time t2 continued to a constant value β or more, and the temperature Dc representing the detection signal of the indoor heat exchange temperature sensor 11 is equal to or less than a predetermined value gamma. If the second stop abnormality determination means S12 determines positive, the temperature difference continues to be large and the temperature of the indoor heat exchanger is low in the multi-room operation despite the stop room, so that an erroneous determination is made. The compressor 2 is stopped because it is determined that the refrigerant is flowing due to piping, erroneous wiring, or a failure to close the expansion valve for each chamber. As a result, even in the case of erroneous pipes, erroneous wiring, and improper closing of the expansion valve for each room under multi-chamber operation, low-temperature refrigerant flows through the indoor heat exchanger 10 of the indoor unit 9 in which the fan is stopped. And freezing of the indoor heat exchanger is reliably prevented.
【００１０】さらに、請求項３に記載の凍結防止装置で
は、上述の請求項２の第２停止異常判断手段Ｓ２２が最
初に肯と判断すると、弁開閉手段Ｓ２３は、その停止異
常の停止室の各室用膨張弁７がごみを挾み込んで閉鎖不
良のため冷媒が流れ続けている可能性があるとして、停
止室の各室用膨張弁７を、一旦全開させてから全閉させ
る。そして、停止異常がごみの挾み込みに起因する場合
は、この操作でごみが除去されて正常に戻る。そこで、
第２停止異常判断手段Ｓ２２は、この弁開閉操作に続い
て再び停止異常か否かの判断を行ない、ここで肯つまり
停止異常と判断されると、初めて第２運転停止手段Ｓ２
５が、ごみの挾み込み以外の原因で冷媒が流れ続けてい
るとして、圧縮機２を停止させる。従って、各室用膨張
弁におけるごみの挾み込みで圧縮機２が停止せしめられ
ることが殆んどなくなり、不必要な停止が減少して運転
率を向上させることができる。Further, in the freeze prevention device according to the third aspect, when the second stop abnormality determining means S22 of the second aspect determines first affirmative, the valve opening / closing means S23 opens the stop chamber of the abnormal stop. It is determined that there is a possibility that the refrigerant may continue to flow due to the improper closing of the expansion valves 7 for each room due to the sandwiching of dust, and the expansion valves 7 for the respective rooms of the stop chamber are once fully opened and then completely closed. If the stop abnormality is caused by dust being trapped, the dust is removed by this operation and the operation returns to normal. Therefore,
Following the valve opening / closing operation, the second stop abnormality determining means S22 again determines whether or not the stop is abnormal. If the result is affirmative, ie, if it is determined that the stop is abnormal, the second operation stop means S2 is performed for the first time.
5 stops the compressor 2 on the assumption that the refrigerant continues to flow due to a cause other than pinching of dust. Therefore, the compressor 2 is hardly stopped due to the trapping of dust in the expansion valves for each chamber, and unnecessary stoppage is reduced, so that the operation rate can be improved.
【００１１】[0011]
【実施例】以下、本発明を図示の実施例により詳細に説
明する。図１は、本発明の凍結防止装置を備えた空気調
和機の一例を示す回路図である。この空気調和機は、圧
縮機２,四路切換弁３,室外熱交換器４,共通膨張弁５,受
液器６および互いに並列な各室用膨張弁７a〜７dを順次
管路８a〜８eで接続した室外ユニット１に室内熱交温度
センサ１１が接触して設けられた室内熱交換器１０と図
示しないファンと室温センサ１２を有する室内ユニット
９a〜９dを接続して、冷凍回路を構成している。上記室
外ユニット１の各室用膨張弁７a〜７dと反対側は、各室
内ユニット９a〜９dに連なるヘッダ１３になっており、
このヘッダ１３と四路切換弁３を,閉鎖弁１４を介設し
た管路８fで、四路切換弁３と圧縮機２の吸込口を,アキ
ュムレータ１５を介設した管路８gで夫々接続してい
る。また、受液器６と各室用膨張弁７a〜７dの間の管路
８eに閉鎖弁１６を設け、受液器６とアキュムレータ１
５の入口側を,キャピラリチューブ１７を介設した管路
８hで接続している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a circuit diagram showing an example of an air conditioner provided with the freeze prevention device of the present invention. In this air conditioner, a compressor 2, a four-way switching valve 3, an outdoor heat exchanger 4, a common expansion valve 5, a liquid receiver 6, and expansion valves 7a to 7d for respective chambers parallel to each other are sequentially connected to pipelines 8a to 8e. The indoor heat exchanger 10 provided with the indoor heat exchange temperature sensor 11 in contact with the outdoor unit 1 connected by the above is connected to a fan (not shown) and the indoor units 9a to 9d having the room temperature sensor 12 to form a refrigeration circuit. ing. On the opposite side of the outdoor unit 1 from each of the room expansion valves 7a to 7d is a header 13 connected to each of the indoor units 9a to 9d.
The header 13 and the four-way switching valve 3 are connected by a pipe 8f provided with a closing valve 14, and the four-way switching valve 3 and the suction port of the compressor 2 are connected by a pipe 8g provided with an accumulator 15. ing. Further, a closing valve 16 is provided in a pipe 8e between the liquid receiver 6 and each of the chamber expansion valves 7a to 7d, and the liquid receiver 6 and the accumulator 1 are provided.
5 are connected to each other by a pipeline 8h provided with a capillary tube 17 interposed therebetween.
【００１２】上記冷凍回路からなる空気調和機には、凍
結防止装置２０を設けている。この凍結防止装置２０
は、請求項１に記載され,後述する運転室数判断手段、
運転異常判断手段、第１停止異常判断手段および第１運
転停止手段を備えたマイクロコンピュータ等からなり、
各室内ユニット９a〜９dの熱交換器の室内熱交温度セン
サ１１と室温センサ１２の検出信号等を受けて所定の演
算を行ない、演算結果に基づいて圧縮機２の発停と各室
用膨張弁７a〜７dの開閉等を制御するようになってい
る。即ち、凍結防止装置２０は、運転室数判断手段とし
て、各室内ユニット９a〜９dからの運転信号の有無によ
って、その室が運転されているか否か,および運転室の
総数mが１か２以上かを判断する(図２のＳ１,Ｓ２参
照)。An air conditioner comprising the above refrigeration circuit is provided with an antifreezing device 20. This freeze prevention device 20
Is a cab number determining means described in claim 1,
A microcomputer provided with operation abnormality determination means, first stop abnormality determination means, and first operation stop means,
Upon receiving detection signals from the indoor heat exchange temperature sensor 11 and the room temperature sensor 12 of the heat exchangers of the indoor units 9a to 9d, predetermined calculations are performed, and based on the calculation results, the compressor 2 is started and stopped and expansion for each room is performed. The opening and closing of the valves 7a to 7d is controlled. That is, the anti-freezing device 20 determines whether or not the room is operated, and determines whether the total number m of the cabs is 1 or 2 or more, based on the presence or absence of an operation signal from each of the indoor units 9a to 9d. (S1 and S2 in FIG. 2).
【００１３】また、凍結防止装置２０は、運転室数mが
１と判断したとき、運転異常判断手段として、運転室の
室温センサ１２と室内熱交温度センサ１１の検出信号に
基づき、圧縮機起動から所定時間t1(例えば１０秒)経過
後に両検出信号の表わす温度差 (Ｄa−Ｄc)が一定値α
以下か否かを判断し、肯と判断すると、運転異常とし
て、その室の番号を記憶する(図２のＳ４,Ｓ５参照)。
同じく、運転室数mが１と判断したとき、第１停止異常
判断手段として、運転信号のない運転されていない室
(停止室)の室温センサ１２と室内熱交温度センサ１１の
検出信号に基づき、両検出信号の表わす温度差(Ｄa−Ｄ
c)が一定値β以上か否かを判断し、肯と判断すると、停
止異常としてその室の番号を記憶し、かつその室数iを
累計する（同Ｓ６,Ｓ７参照)。そして、第１運転停止手
段として、上記累計された室数iが１のとき、その一つ
の運転異常室と一つの停止異常室の各室用膨張弁７を全
閉させ、かつ室内ファン(図示せず)を停止させる(同Ｓ
９参照)。When the number m of operating cabs is determined to be 1, the anti-freezing device 20 starts the compressor based on detection signals from the room temperature sensor 12 and the indoor heat exchange temperature sensor 11 of the cab as operation abnormality determining means. After a lapse of a predetermined time t1 (for example, 10 seconds), the temperature difference (Da−Dc) represented by the two detection signals becomes a constant value α.
It is determined whether or not it is below, and if it is affirmative, the number of the room is stored as an operation abnormality (see S4 and S5 in FIG. 2).
Similarly, when it is determined that the number m of cabs is one, as a first stop abnormality determination means, a non-operated cab without an operation signal is provided.
Based on the detection signals of the room temperature sensor 12 and the indoor heat exchange temperature sensor 11 in the (stop room), a temperature difference (Da−D
It is determined whether or not c) is equal to or greater than a fixed value β. If the determination is affirmative, the number of the room is stored as a stop abnormality and the number i of the rooms is accumulated (see S6 and S7). As the first operation stopping means, when the accumulated number of chambers i is 1, the expansion valves 7 for each of the one abnormal operation chamber and one abnormal stop chamber are fully closed, and the indoor fan (FIG. Stop (not shown)
9).
【００１４】上記構成の凍結防止装置２０は、図２のフ
ローチャートに従って、次のように動作する。図１の冷
凍回路において、四路切換弁３が図中の実線で示す通路
側に切り換えられ、圧縮機２の起動により、冷媒が図中
の実線矢印の如く室外熱交換器４で凝縮し、各室内熱交
換器１０で蒸発するように循環して冷房運転が始まる。
凍結防止装置２０は、ステップＳ１で、各室内ユニット
９a〜９dからの運転信号の有無によって、その室が運転
されているか否かを判断し、運転室の室数mを計数し、
次いで、ステップＳ２で、計数値m(運転室総数)が１か
２以上かを判断する。計数値mが１と判断すると、ステ
ップＳ３に進んで、圧縮機２の起動からt1時間経過した
か否かを判断し、経過したと判断すると、ステップＳ４
に進む。ステップＳ４では、その運転室について、室温
センサ１２と室内熱交温度センサ１１の検出信号に基づ
いて、両検出信号の表わす温度差(Ｄa−Ｄc)が一定値α
以下か否かを判断し、否と判断すると、運転正常とする
一方、肯と判断すると、運転されているにも拘わらず上
記温度差が小さいので運転異常として、ステップＳ５
で、その室の番号を記憶する。The anti-freezing device 20 having the above configuration operates as follows according to the flowchart of FIG. In the refrigeration circuit of FIG. 1, the four-way switching valve 3 is switched to the passage side indicated by the solid line in the figure, and the refrigerant is condensed in the outdoor heat exchanger 4 as indicated by the solid line arrow in the figure by the start of the compressor 2. The cooling operation is started by circulation so as to evaporate in each indoor heat exchanger 10.
In step S1, the anti-freezing device 20 determines whether or not the room is being operated based on the presence or absence of an operation signal from each of the indoor units 9a to 9d, and counts the number m of the operation room,
Next, in step S2, it is determined whether the count value m (total number of cabs) is 1 or 2 or more. When the count value m is judged to 1, the routine proceeds to step S3, it is determined whether the elapsed t1 hour from the startup of the compressor 2, it is determined to have elapsed, step S4
Proceed to. In step S4, the temperature difference (Da-Dc) represented by the two detection signals is determined to be a constant value α based on the detection signals of the room temperature sensor 12 and the indoor heat exchange temperature sensor 11 for the cab.
It is determined whether or not the temperature is below or not. If the determination is negative, the operation is normal. On the other hand, if the determination is affirmative, the operation is abnormal because the temperature difference is small despite the operation.
Then, the number of the room is stored.
【００１５】次いで、ステップＳ６で、運転信号のない
停止室について室温センサ１２と室内熱交温度センサ１
１の検出信号に基づき、両検出信号の表わす温度差（Ｄ
a−Ｄc)が一定値β以上か否かを判断し、否と判断する
と、停止正常とする一方、肯と判断すると、停止してい
るにも拘わらず上記温度差が大きいので停止異常とし
て、ステップＳ７で、その室の番号を記憶し、その室数
iを累計する。続いて、ステップＳ８で、上記累計値iが
１か,０または２以上かを判断し、iが１のときは、ステ
ップＳ９に進んで、一対の運転,停止異常室の各室用膨
張弁７を全閉させ、かつ室内ファンを停止させる。ま
た、iが０または２以上の場合は、ステップＳ１の運転
室数の計数の処理に戻る。これによって、誤配管,誤配
線および各室用膨張弁７の閉鎖不良いずれの場合も、１
室運転下で、ファンの止まった室内ユニット９の室内熱
交換器１０には、低温の冷媒が流れ続けることがなく、
室内熱交換器１０の凍結が確実に防止される。Next, in step S6, the room temperature sensor 12 and the indoor heat exchange temperature sensor 1
1 based on the detection signal, the temperature difference (D
a-Dc) is determined to be equal to or more than a fixed value β, and if not, it is determined that the stop is normal, while if it is determined to be positive, the stop is abnormal because the temperature difference is large despite the stop. In step S7, the number of the room is stored, and the number of the room is stored.
Accumulate i. Subsequently, in step S8, it is determined whether the cumulative value i is 1, 0, or 2 or more. When i is 1, the process proceeds to step S9, and the expansion valve for each of the pair of operation and stop abnormal chambers is used. 7 is completely closed, and the indoor fan is stopped. If i is 0 or 2 or more, the process returns to step S1 for counting the number of cabs. Thereby, in the case of erroneous piping, erroneous wiring, or a failure to close the expansion valve 7 for each chamber, 1
Under the indoor operation, the low-temperature refrigerant does not continue to flow in the indoor heat exchanger 10 of the indoor unit 9 in which the fan has stopped,
Freezing of the indoor heat exchanger 10 is reliably prevented.
【００１６】図３は、請求項２に記載された凍結防止装
置の一実施例による制御の流れを示すフローチャートで
あり、この装置２０を備えた空気調和機の回路図は、図
１と同じである。上記凍結防止装置２０は、停止室検知
手段と第２停止異常判断手段と第２運転停止手段とを備
える。上記停止室検知手段は、各室内ユニット９a〜９d
からの運転信号によって運転されていない室(停止室)を
検知し、検知した停止室の番号を記憶するとともに、そ
の室数nを計数する(図３のＳ１１参照)。上記第２停止
異常判断手段は、検知されたn個の各停止室について、
室温センサ１２と室内熱交温度センサ１１の検出信号に
基づき、両検出信号の表わす温度差(Ｄa−Ｄc)が所定時
間t2継続して一定値β以上で、かつ室内熱交温度センサ
１１の検出信号の表わす温度Ｄcが一定値γ以下である
か否かを判断する(図３のＳ１２参照)。そして、この第
２停止異常判断手段が肯と判断したとき、上記第２運転
停止手段が、圧縮機２を停止させるようになっている
(図３のＳ１３参照)。FIG. 3 is a flowchart showing a control flow according to one embodiment of the freeze prevention device according to the second aspect. The circuit diagram of the air conditioner provided with this device 20 is the same as that of FIG. is there. The freeze prevention device 20 includes a stop room detecting unit, a second stop abnormality determining unit, and a second operation stopping unit. The above-mentioned stop room detecting means is provided in each of the indoor units 9a to 9d.
A non-operated room (stop room) is detected according to the operation signal from, the number of the detected stop room is stored, and the number n of the rooms is counted (see S11 in FIG. 3). The second stop abnormality determination means is provided for each of the detected n stop chambers.
Based on the detection signals of the room temperature sensor 12 and the indoor heat exchange temperature sensor 11, the temperature difference (Da−Dc) represented by the two detection signals is equal to or more than a constant value β for a predetermined time t2 , and It is determined whether or not the temperature Dc represented by the detection signal is equal to or lower than a certain value γ (see S12 in FIG. 3). When the second stop abnormality judging means judges affirmative, the second operation stopping means stops the compressor 2.
(See S13 in FIG. 3).
【００１７】上記構成の請求項２に係る実施例は、図３
に従って次のように動作する。凍結防止装置２０は、ス
テップＳ１１で、運転信号により停止室を検知して、そ
の室番号を記載し、その室数nを計数する。つぎに、ス
テップＳ１２で、n個の各停止室について、室温センサ
１２と室内熱交温度センサ１１の検出信号に基づいて、
両検出信号の表わす温度差(Ｄa−Ｄc)が所定時間t2継続
して一定値β以上で、かつ室内熱交換器の温度Ｄcが一
定値γ以下であるか否かを判断する。そして、ここで否
と判断すると、停止正常とする一方、肯と判断すると、
停止しているにもかかわらず誤配管,誤配線または各室
用膨張弁７の閉鎖不良があって、室内熱交換器に冷媒が
流れているとして、ステップＳ１３に進んで、圧縮機２
を停止させ、かつ全室の室内ファンを停止させる。これ
によって、多室運転下で誤配管,誤配線および各室用膨
張弁７の閉鎖不良いずれの場合も、ファンの止まった室
内ユニット９の室内熱交換器１０には、低温の冷媒が流
れ続けることがなく、室内熱交換器１０の凍結が確実に
防止されることになる。The embodiment according to claim 2 having the above-mentioned structure is similar to that of FIG.
Operates as follows. In step S11, the anti-freezing device 20 detects a stopped room based on the operation signal, describes the room number, and counts the number n of the rooms. Next, in step S12, for each of the n stop chambers, based on the detection signals of the room temperature sensor 12 and the indoor heat exchange temperature sensor 11,
Temperature difference represented by the two detection signals (Da-Dc) is at a predetermined time t2 continued to a constant value β or more, and the temperature Dc of the indoor heat exchanger is equal to or less than a predetermined value gamma. Then, if it is determined to be no here, the stop is determined to be normal, while if it is determined to be positive,
It is determined that there is erroneous piping, erroneous wiring, or closing failure of the expansion valve 7 for each room despite the stoppage, and the refrigerant is flowing through the indoor heat exchanger.
And stop all indoor fans. Thereby, in the case of erroneous piping, erroneous wiring, or poor closing of the expansion valve 7 for each room under multi-chamber operation, low-temperature refrigerant continues to flow through the indoor heat exchanger 10 of the indoor unit 9 where the fan is stopped. Therefore, freezing of the indoor heat exchanger 10 is reliably prevented.
【００１８】図４は、図３の変形例で,請求項３に記載
された凍結防止装置の一実施例による制御の流れを示す
フローチャートであり、この装置２０を備えた空気調和
機の回路図も、図１と同じである。上記凍結防止装置２
０は、図３で述べたと同じ停止室検知手段Ｓ２２(図３
のＳ１１)および類似の第２停止異常判断手段Ｓ２２,Ｓ
２４(図３のＳ１２)と第２運転停止手段Ｓ２５(図３の
Ｓ１３)を備え、さらに弁開閉手段Ｓ２３を備えてい
る。この弁開閉手段は、上記第２停止異常判断手段が、
最初に肯と判断したとき(図４のＳ２２参照)、その停止
異常の停止室の各室用膨張弁７を、一旦全開させてから
全閉させる。また、第２停止異常判断手段は、弁開閉手
段Ｓ２３による弁の開閉操作に続いて、その停止室につ
き再びステップＳ２２と同じ判断を行ない(図４のＳ２
４参照)、ここで再び肯と判断されたときに初めて、上
記第２運転停止手段Ｓ２５が、圧縮機２を停止させるよ
うになっている。FIG. 4 is a flow chart showing a control flow according to a modification of FIG. 3 according to an embodiment of the anti-freezing device according to claim 3, and a circuit diagram of an air conditioner equipped with this device 20. Is also the same as FIG. The above freeze prevention device 2
0 is the same as the stop chamber detecting means S22 described in FIG.
S11) and similar second stop abnormality determination means S22, S
24 (S12 in FIG. 3), a second operation stopping means S25 (S13 in FIG. 3), and a valve opening / closing means S23. This valve opening / closing means is such that the second stop abnormality determination means is
When a positive determination is first made (see S22 in FIG. 4), the expansion valves 7 for the respective chambers of the stop chamber having the abnormal stop are once fully opened and then completely closed. Further, following the valve opening / closing operation by the valve opening / closing means S23, the second stop abnormality determination means makes the same determination as in step S22 again for the stop chamber (S2 in FIG. 4).
4), the second operation stopping means S25 stops the compressor 2 only when it is determined to be positive again.
【００１９】上記構成の請求項３に係る実施例は、図４
のフローチャートから判るように、図３のステップＳ１
２とＳ１３の間に、ステップＳ２３とＳ２４を挿入した
ものである。従って、図３と同じ部分の説明を省略し、
異なる部分のみについて述べる。凍結防止装置２０は、
ステップＳ２２で最初に肯と判断すると、ステップＳ２
３に進んで、その停止異常の停止室の各室内用膨張弁７
が、ごみを挾み込んで閉鎖不良のため冷媒が流れ続けて
いる可能性があるとして、その停止室の各室用膨張弁７
を一旦全開させてから全閉させる。停止異常がごみの挾
み込みに起因する場合は、この操作でごみが循環冷媒で
除去されて正常に戻る。そこで、続くステップＳ２４
で、再びその停止室について停止異常か否かの判断を行
ない、ここで肯と判断すると、初めてステップＳ２５に
進んで、ごみ挾み込み以外の原因で冷媒が流れ続けてい
るとして、圧縮機２を停止させる。従って、各室用膨張
弁７a〜７dにおけるごみの挾み込みで、圧縮機２が停止
せしめられることが殆んどなくなり、不必要な停止が減
少して運転率を向上させることができる。An embodiment according to claim 3 having the above-mentioned structure is shown in FIG.
As can be seen from the flowchart of FIG.
Steps S23 and S24 are inserted between Steps 2 and S13. Therefore, the description of the same parts as in FIG. 3 is omitted,
Only different parts will be described. The anti-freezing device 20
If a positive determination is made in step S22, step S2
3 and the expansion valves 7 for the respective rooms of the stop chamber having the stop abnormality
However, since it is possible that the refrigerant may continue to flow due to the poor closing of the dust, the expansion valves 7
Is once fully opened and then fully closed. If the stop abnormality is caused by trapping of dust, this operation removes the dust with the circulating refrigerant and returns to normal. Therefore, the following step S24
Then, it is again determined whether or not the stop chamber is abnormally stopped. If the determination is affirmative, the process proceeds to step S25 for the first time, and the compressor 2 determines that the refrigerant continues to flow for reasons other than dust trapping. To stop. Therefore, the compressor 2 is hardly stopped by the dust trapped in each of the expansion valves 7a to 7d, and unnecessary stoppage is reduced, and the operation rate can be improved.
【００２０】なお、本発明が、実施例に示した冷暖房兼
用の空気調和機に限らず、冷房専用の空気調和機にも適
用できるのはいうまでもない。また、実施例では、各室
用膨張弁７ａ〜７ｄを室外ユニット１内に設けたが、こ
れを各室内ユニット９ａ〜９ｄに夫々設けてもよい。It goes without saying that the present invention can be applied not only to the air conditioner for cooling and heating shown in the embodiment but also to an air conditioner for cooling only. Further, in the embodiment, each of the room expansion valves 7a to 7d is provided in the outdoor unit 1, but may be provided in each of the indoor units 9a to 9d.
【００２１】[0021]
【発明の効果】以上の説明で明らかなように、本発明の
空気調和機の第１の凍結防止装置は、圧縮機等を有する
室外ユニットに、室内熱交温度センサをもつ室内熱交換
器とファンと室温センサを有する複数の室内ユニット
を、各室用膨張弁を介して並列に接続した空気調和機に
おいて、運転室数判断手段により、各室内ユニットから
の運転信号に基づいて運転室数が１か２以上かを判断
し、１と判断された時、運転異常判断手段により、圧縮
機起動から所定時間経過後に、運転室の室温センサと室
内熱交温度センサの両検出信号の表わす温度差が一定値
以下か否かを判断し、肯と判断した室の番号を運転異常
室として記憶すると共に、１と判断された時、第１停止
異常判断手段により、停止室の上述と同様の温度差が一
定値以上か否かを判断し、肯と判断した室の番号を停止
異常室として記憶し,その室数を累計する一方、第１運
転停止手段により、上記両判断手段に記憶された室数が
夫々１の時、当該一対の運転,停止異常室の上記各室用
膨張弁を全閉させるようにしているので、１室運転下
で、誤配管,誤配線および各室用膨張弁の閉鎖不良等に
起因して,ファンが止まった室内ユニットの熱交換器へ
の低温冷媒の循環を阻止でき、室内熱交換器の凍結を防
止できて、凍結によるフィンチューブの破損や室内家具
等の汚損をなくすことができる。As is apparent from the above description, the first freezing prevention device of the air conditioner according to the present invention includes an outdoor unit having a compressor and the like, an indoor heat exchanger having an indoor heat exchange temperature sensor. In an air conditioner in which a plurality of indoor units having a fan and a room temperature sensor are connected in parallel via each room expansion valve, the number of operating rooms is determined by operating room number determining means based on an operating signal from each indoor unit. It is determined whether it is 1 or more, and when it is determined that the temperature is 1, when a predetermined time elapses from the start of the compressor by the operation abnormality determination means, the temperature difference represented by both the detection signals of the room temperature sensor of the cab and the indoor heat exchange temperature sensor. Is determined to be equal to or less than a predetermined value, and the number of the room determined to be positive is stored as an abnormal operation room. When it is determined to be 1, the first stop abnormality determination means uses the same temperature of the stop room as described above. Judge whether the difference is over a certain value The number of the room determined to be affirmative is stored as a stop abnormal room, and the number of the rooms is accumulated. On the other hand, when the number of rooms stored in both of the determination units is 1 by the first operation stopping means, the pair of the pair is determined. Because the above-mentioned expansion valves for each room in the abnormal operation / stop chamber are fully closed, the fan may not operate due to erroneous piping, incorrect wiring, poor closing of the expansion valves for each room, etc. The circulation of the low-temperature refrigerant to the heat exchanger of the stopped indoor unit can be prevented, the freezing of the indoor heat exchanger can be prevented, and the fin tubes can be prevented from being damaged due to the freezing and the indoor furniture and the like can be prevented from being stained.
【００２２】また、本発明の第２の凍結防止装置は、上
述の空気調和機において、停止室検知手段により、各室
内ユニットからの運転信号で停止室を検知し、検知され
た各停止室について、第２停止異常判断手段により、室
温センサ,室内熱交温度センサの検出信号が夫々表わす
温度の差が、所定時間継続して一定値以上で,かつ室内
熱交温度センサの検出信号が表わす温度が一定値以下で
あるか否かを判断するとともに、ここで肯と判断された
とき、第２運転停止手段により、圧縮機を停止させるよ
うにしているので、多室運転下で、誤配管,誤配線およ
び各室用膨張弁の閉鎖不良等に起因して,ファンが止ま
った室内ユニットの熱交換器への低温冷媒の循環を阻止
でき、室内熱交換器の凍結を防止できるから、上述の効
果を奏することができる。さらに、上記第２の凍結防止
装置に、第２停止異常判断手段が最初に肯と判断したと
き、その停止異常の停止室の各室用膨張弁を,一旦全開
させてから全閉させる弁開閉手段を備え、この弁開閉手
段による弁の開閉操作に続いて、上記第２停止異常判断
手段に再び判断を行なわせ、この手段が再び肯と判断し
たときに初めて、上記第２運転停止手段をして、圧縮機
を停止せしめるようにすれば、各室用膨張弁におけるご
みの挾み込みで圧縮機が停止せしめられることが殆んど
なくなり、不必要な停止の減少で運転率を向上させるこ
とができる。Further, in the second freeze prevention device of the present invention, in the above-mentioned air conditioner, the stop room detecting means detects the stop room by the operation signal from each indoor unit and detects the detected stop room. The difference between the temperatures indicated by the detection signals of the room temperature sensor and the indoor heat exchange temperature sensor is equal to or greater than a predetermined value for a predetermined time and the temperature indicated by the detection signal of the indoor heat exchange temperature sensor is determined by the second stop abnormality determination means. Is determined to be less than or equal to a predetermined value, and when the determination is affirmative, the compressor is stopped by the second operation stop means. Due to miswiring and poor closing of the expansion valves for each room, etc., the circulation of low-temperature refrigerant to the heat exchanger of the indoor unit where the fan has stopped can be prevented, and the freezing of the indoor heat exchanger can be prevented. Can be effective . Further, in the second freeze prevention device, when the second stop abnormality determination means first determines that the stop is abnormal, the valve expansion / closing unit opens and closes the expansion valves for the respective rooms of the stop chamber of the abnormal stop once. After the valve opening / closing operation by the valve opening / closing means, the second stop abnormality judging means is made to make a judgment again. If the compressor is stopped, the compressor is hardly stopped by dust trapping in the expansion valves for each chamber, and the operation rate is improved by reducing unnecessary stoppage. be able to.
【図１】 本発明の凍結防止装置の一実施例を備えた空
気調和機を示す回路図である。FIG. 1 is a circuit diagram showing an air conditioner provided with an embodiment of an antifreezing device of the present invention.
【図２】 請求項１に記載の装置の一実施例の動作の流
れを示すフローチャートである。FIG. 2 is a flowchart showing an operation flow of an embodiment of the apparatus according to claim 1;
【図３】 請求項２に記載の装置の一実施例の動作の
流れを示すフフローチャートである。FIG. 3 is a flowchart showing an operation flow of an embodiment of the apparatus according to claim 2;
【図４】 請求項３に記載の装置の一実施例の動作の
流れを示すフフローチャートである。FIG. 4 is a flowchart showing an operation flow of an embodiment of the apparatus according to claim 3;
１…室外ユニット、２…圧縮機、４…室外熱交換器、５
…共通膨張弁、７a〜７d…各室用膨張弁、８a〜８h…管
路、９a〜９d…室内ユニット、１０…室内熱交換器、１
１…温度センサ、１２…室温センサ、２０…凍結防止装
置。DESCRIPTION OF SYMBOLS 1 ... Outdoor unit, 2 ... Compressor, 4 ... Outdoor heat exchanger, 5
... common expansion valves, 7a-7d ... expansion valves for each room, 8a-8h ... pipelines, 9a-9d ... indoor units, 10 ... indoor heat exchangers, 1
1 ... temperature sensor, 12 ... room temperature sensor, 20 ... freezing prevention device.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 49/02 570 F24F 11/02 102──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl.7 , DB name) F25B 49/02 570 F24F 11/02 102
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08716593AJP3152006B2 (en) | 1993-04-14 | 1993-04-14 | Anti-freezing device for air conditioners |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08716593AJP3152006B2 (en) | 1993-04-14 | 1993-04-14 | Anti-freezing device for air conditioners |
| Publication Number | Publication Date |
|---|---|
| JPH06300397A JPH06300397A (en) | 1994-10-28 |
| JP3152006B2true JP3152006B2 (en) | 2001-04-03 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08716593AExpired - Fee RelatedJP3152006B2 (en) | 1993-04-14 | 1993-04-14 | Anti-freezing device for air conditioners |
| Country | Link |
|---|---|
| JP (1) | JP3152006B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6655532B1 (en) | 1993-03-30 | 2003-12-02 | Fujitsu Limited | Vertical installation system in which information processing apparatuses are installed |
| CN110094858A (en)* | 2019-04-11 | 2019-08-06 | 海信（山东）空调有限公司 | Control method, device, computer product and the air-conditioning of air conditioner electronic expansion valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6655532B1 (en) | 1993-03-30 | 2003-12-02 | Fujitsu Limited | Vertical installation system in which information processing apparatuses are installed |
| CN110094858A (en)* | 2019-04-11 | 2019-08-06 | 海信（山东）空调有限公司 | Control method, device, computer product and the air-conditioning of air conditioner electronic expansion valve |
| CN110094858B (en)* | 2019-04-11 | 2021-04-23 | 海信（山东）空调有限公司 | Control method and device of air conditioner electronic expansion valve, computer product and air conditioner |
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| JPH06300397A (en) | 1994-10-28 |
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