CN1888652A - Control method for reverse-phase compressor in air conditioner - Google Patents

Abstract

This invention relates to reverse phase compressor controlling method of air conditioner. It includes: steps for repeatedly judging the needed currently objective working frequency of reverse phase compressor, based on the set phase. According to this controlling method, the compressing capacity of reverse phase compressor changes only when it must change.

Description

The control method of the reverse-phase compressor in the air-conditioner

Technical field

The present invention relates to a kind of reverse-phase compressor, detailed says so, relate to the control method that makes the stable reverse-phase compressor of operating of reverse-phase compressor, more detailed says so, make the reverse-phase compressor that uses in the air-conditioner at the variation of improper external environment condition and stable the operation, thereby improve the control method of the reverse-phase compressor in the air-conditioner of the satisfaction of user when using.

Background technology

General air-conditioner is processes such as the compression, condensation, expansion, evaporation by refrigerant, can force the machine of transfer of heat between machine intimate and machine exterior.Recently, be extensive use of above-mentioned air-conditioner in order to make the user have comfortable indoor environment, and switch to the positive direction of air-conditioning system or in the other direction, make it reach cold-room operation or greenhouse operation by cyclic process with refrigerant.Certainly, be applied to cold-room operation or greenhouse operation in order to make above-mentioned air-conditioner, the inside of above-mentioned air-conditioner is equipped with cubic valve, the flow direction of changeable above-mentioned refrigerant.And, will be connected with a plurality of indoor sets in the single off-premises station recently, can carry out air conditioning respectively to a plurality of interior spaces of being separated by the said system air conditioner structure by wall.

In addition, in order in the compressor of compression refrigerant, to compress the refrigerant of corresponding amount, be extensive use of the variable reverse-phase compressor of rotation number of compressor recently according to required air-conditioning heat.Because the rotation number of above-mentioned reverse-phase compressor is variable, so can reach the air conditioner surroundings that the user needs rapidly.Simultaneously, above-mentioned reverse-phase compressor can be at the refrigerant of the situation lower compression aequum that does not carry out on/off operation, thus the noise that produces can avoid the compressor ON/OFF time.Above-mentioned reverse-phase compressor will be regulated the rotation number of reverse-phase compressor, the refrigerant decrement of reverse-phase compressor according to the operating frequency of control compressor, and the air-conditioning heat of air-conditioner.

Above-mentioned reverse-phase compressor has different refrigerant decrements according to concrete air conditioner surroundings, has as the factor of decision air conditioner surroundings: the workbench number of the required target temperature of user, actual indoor temperature, actual outdoor temperature, indoor set etc.Therefore, when the user set required indoor temperature, air-conditioner will be according to the workbench number of actual indoor temperature, actual outdoor temperature, indoor set etc., determines the operating frequency of above-mentioned reverse-phase compressor, and carries out the running operation of compressor.And the said external condition will detect with certain cycle, and the operating frequency of above-mentioned reverse-phase compressor is then corresponding to above-mentioned air conditioner surroundings, have different values according to certain cycle, thereby can more promptly reach the required air conditioner surroundings of user.

But when by the detected external environment condition irregular change of air-conditioner, the operating frequency of reverse-phase compressor will sharply change.For example, indoor door is unlocked and has been blown into outdoor air, makes above-mentioned outdoor air directly touch the indoor temperature transmitter of air-conditioner, thereby detects and the actual different indoor temperature of indoor temperature.Perhaps, be used for the communication data that air-conditioner is controlled is made a mistake, make under the situation by the above-mentioned wrong external condition that transmits of control part identification, above-mentioned reverse-phase compressor can't normally be operated.

Summary of the invention

In order to solve above-mentioned problems of the prior art, the object of the present invention is to provide the control method of the reverse-phase compressor in a kind of air-conditioner, make the operating frequency of reverse-phase compressor correctly tackle external condition.

And, another object of the present invention is to provide the control method of the reverse-phase compressor in a kind of air-conditioner, can suitably ignore information, thereby reverse-phase compressor and even whole air-conditioner are correctly operated by the external condition of sensor error identification.

To achieve these goals, the control method of the reverse-phase compressor in the air-conditioner of the present invention is characterized in that, includes following several steps: the step of judging the current goal operating frequency of the reverse-phase compressor that needs under the current state with the set cycle repeatedly; If the number of occurrence of above-mentioned current goal operating frequency is when to be certain number of times above, set the step of above-mentioned current goal operating frequency as the new operating frequency of above-mentioned reverse-phase compressor.

According to the control method of aforesaid reverse-phase compressor, can correctly judge the variation of external environment condition, above-mentioned compressor is stable operates thereby make.Further say, owing to can prevent that the air-conditioner mode of operation from sharply changing, thereby improve the satisfaction of user when using product.

The control method of the reverse-phase compressor in according to the present invention, the compression volume of reverse-phase compressor is only changed under necessary information, and, can prevent that improper external condition variation in a period of time or air-conditioner mistake in operational a period of time from causing the mode of operation of reverse-phase compressor to change.

Description of drawings

Fig. 1 is the stereogram of the air-conditioning system among the present invention;

Fig. 2 is the drawing for the control structure that above-mentioned reverse-phase compressor is described;

Fig. 3 is the flow chart for the control method that the reverse-phase compressor among the present invention is described.

The specific embodiment

The present invention will be described in detail with reference to the accompanying drawings, but the present invention is not confined to the embodiment of the following stated, in the category that does not exceed basic fundamental thought of the present invention, the operator of relevant industries can add, change, delete it, thereby draws other that includes basic fundamental thought of the present invention easily

Embodiment.

Fig. 1 is the stereogram of the air-conditioning system among the present invention.

With reference to above-mentioned accompanyingdrawing 1, it includes following several sections: the reverse-phase compressor 1 that is used for compression refrigerant; When cold-room is operated, operate, when greenhouse is operated, operate as condenser as evaporimeter, thus a plurality of indoor sets 12～16 that indoor temperature is controlled; When cold-room is operated, operate, when greenhouse is operated, operate as evaporimeter as condenser, thus the off-premises station 4 that indoor temperature is controlled; Be used to control a plurality of electronic valves (EEV:Electronic Expansion Valve) 7～11 of the cold medium flux that supplies to above-mentioned a plurality of indoor set 12～16; The refrigerant of the HTHP of the above-mentionedcompressor 1 that will flow into by reservoir (accumulator) 2 is exported to the cubic valve (four way valve) 3 of above-mentioned a plurality of indoor set 12～16 or off-premises station 4 according to the mode of operation of cold/greenhouse; The machine oil that contains in the refrigerant that above-mentionedcompressor 1 is discharged turns back to the direction ofcompressor 1, thereby prevents the not lubricant separator 6 of foot phenomenon of machine oil; The receiver (receiver) 5 that is used for coolant quantity in the maintenance system.

Below the as above mode of operation of the air-conditioning system of structure is described.Carrying out under the situation of cold-room operation, the gaseous coolant of the HTHP of compression will supply to cubic valve 3 by reservoir 2 in the above-mentionedcompressor 1, and by above-mentioned cubic valve 3 and then supply to off-premises station 4.Then, above-mentioned off-premises station 4 carries out heat exchange with extraneous air, the high-pressure liquid refrigerant of normal temperature can be supplied to lubricant separator 6 by receiver 5.The machine oil that contains in 6 refrigerants with above-mentioned compression of said engine oil separator turns back to above-mentionedcompressor 1 direction by capillary filter (capillary filter), thereby prevents the phenomenon of machine oil deficiency in the air-conditioning system.Wherein, the effect of said engine oil is: the contact site that can prevent the compressor interior fittings produces friction phenomenon.In addition, carry out being provided with said engine oil separator 6 in addition in order to make the machine oil that contains in the refrigerant turn back to above-mentionedcompressor 1 in the process of squeeze operation at above-mentioned reverse-phase compressor.

Then, after controlling the flow of refrigerant respectively by above-mentioned electronic valve 7～11, will supply with the liquid refrigerants of low-temp low-pressure to each indoor set 12～16,12～16 of above-mentioned a plurality of indoor sets are operated as evaporimeter, and the interior space is cooled off.And the refrigerant of evaporation will turn back in thecompressor 1 by above-mentioned cubic valve 3.At this moment, above-mentioned indoor set 12～16 will carry out the air-conditioning operation of individual to the zone of each selection.

When above-mentioned air-conditioning system is operated with the greenhouse mode of operation, the connection status of above-mentioned cubic valve 3 changes, and make the contrary direction circulation of refrigerant, and above-mentioned indoor set 12～16 will be operated as condenser, and above-mentioned off-premises station 4 is then operated as evaporimeter.

Simultaneously, above-mentioned a plurality of electronic valves 7～11 will determine opening degree according to the difference between capacity, duty, indoor temperature and the design temperature of each indoor set 12～16 that connects, thereby can supply with the refrigerant of appropriate amounts to above-mentioned each indoor set 12～16.In addition, above-mentioned reverse-phase compressor 1 will periodically be set its operating frequency according to the duty of indoor temperature, outdoor temperature, design temperature, indoor set etc.

Structure and control method thereof to above-mentioned reverse-phase compressor 1 describes below.

Fig. 2 is the drawing for the control structure that reverse-phase compressor is described.Operating structure below with reference to 2 pairs of above-mentioned reverse-phase compressors 1 of above-mentioned accompanying drawing describes.

Above-mentioned reverse-phase compressor 1 constitutes mutually by 3, and is wound with 3 coils at each on mutually, has the driving power of out of phase by connecting on above-mentioned 3 coils, and above-mentioned compressor is driven.Wherein, the driving power of supplying with in the above-mentionedcompressor 1 will be controlled by anti-phase 22, and passes to compressor 1.As shown in the figure, above-mentioned anti-phase 22 by 6 switch elements (U, V, W, X, Y Z) constitutes, above-mentioned each switch element is connected in series in pairs, and supplies with driving power by three output lines to above-mentioned reverse-phase compressor 1.

And, also include the converter section (converter) 21 that is used for generating above-mentioned anti-phase 22 DC voltage of supplying with in the control structure of the present invention, above-mentionedconverter section 21 is connected in theAC power end 20 of the inner input of product, can carry out rectification to the AC power of input, and supply in above-mentioned anti-phase 22.

More detailed says, as shown in the figure, on/off operation that above-mentionedconverter section 21 will be by switch element (IGBT) and large value capacitor C discharge and recharge operation, generate the required High Level DC Voltage of driving of above-mentioned compressor 1.And, also include reactor (reactor) R that is used to improve power factor.

And, also include in the accompanying drawing 2: be used to drive above-mentionedconverter section 21 and anti-phase 's 22IGBT drive circuit 23, and anti-phase drive circuit 25.Above-mentionedIGBT drive circuit 23 can be controlled the open/close state of the switch element (IGBT) in the above-mentionedconverter section 21 bycontrol part 26 controls; In addition, above-mentionedanti-phase drive circuit 25 is bycontrol part 26 control, can to 6 switch elements in above-mentioned anti-phase 22 (U, V, W, X, Y, open/close state Z) is controlled.In order to generate the normal voltage that is used to drive above-mentionedcompressor 1, above-mentionedanti-phase drive circuit 25 will often be exported data and receive in 6 above-mentioned anti-phase 22 switch elements.Wherein, the normal output data of above-mentioned input are the data of the target operating frequency correspondence of the compressor of decision in the above-mentioned control part 26.Then, above-mentionedanti-phase drive circuit 25 is regulated by the Duty of pwm signal, will regulate the target operating frequency of above-mentionedcompressor 1.

And above-mentioned DC powersupply test section 24 detects the size of curtage that sends anti-phase 22 dc source from above-mentionedconverter section 21 to, and sends detected result to above-mentioned control part 26.The operating frequency of 26 pairs of above-mentioned reverse-phase compressors 1 of above-mentioned control part monitors, above-mentioned operating frequency is controlled in the integrated operation of air-conditioner, and made reverse-phase compressor or indoor/outdoor fan etc. carry out suitable operation according to external conditions such as detected outdoor temperature and/or indoor temperature in the test section 27.In addition, the operating frequency of the operation correspondence of above-mentioned compressor will be detected by a plurality of sensors that form between the gyrator of compressor and the stator, send detection signal to controlpart 26 by the sensor, thereby can confirm above-mentioned operating frequency.

The present invention is characterized in that the control method of above-mentioned reverse-phase compressor, and the reverse-phase compressor among the present invention is characterised in that, will change its operating frequency according to the mode of operation of a plurality of indoor sets.

Fig. 3 is the flow chart for the control method that the reverse-phase compressor among the present invention is described.

With reference to above-mentioned accompanying drawing 3, the reverse-phase compressor 1 that is provided with in the air-conditioner is operated (St 11) with the operating frequency that presets, and when the air-conditioner initial start, above-mentioned reverse-phase compressor 1 can start by set starting algorithm.Above-mentioned reverse-phase compressor 1 is proceeded operation (St 12) with the regular hour, and through behind the certain hour, decision is suitable for the current goal operating frequency (St 13) of current operating condition.

Above-mentioned current goal operating frequency can be judged by the present load amount of the indoor set in the indoor temperature of current time point, outdoor temperature, the work etc.In addition, above-mentioned current goal operating frequency also can be judged by above-mentionedcontrol part 26, or detects by above-mentionedtest section 27, and judges by a plurality of information that send above-mentionedcontrol part 26 to.That is,, mean that the higher or a plurality of indoor sets of indoor temperature and/or outdoor temperature are in the state in the driving if above-mentioned current goal operating frequency needs more load capacity when higher; If above-mentioned current goal operating frequency then needs less load capacity when low, mean that indoor temperature and/or outdoor temperature indoor set lower or minority is in the state in the driving.

After the above-mentioned current goal frequency of decision, then judge current goal frequency and target frequency whether identical (St 14) before, above-mentioned before target frequency refer to the target frequency that the load capacity of the last one-period before the current state determines.

In addition, above-mentioned current and before relatively result in the comparison step of target frequency, when above-mentioned two target frequencies have nothing in common with each other, with the current goal frequency modification for before target frequency and store (St15).But the current goal frequency here can not be set at the operating frequency of above-mentioned reverse-phase compressor 1.

And frequency refers to the target frequency of the load capacity decision of the last one-period before the current state.

In addition, the result who compared in the comparison step of target frequency before above-mentioned current reaching when above-mentioned two target frequencies are identical, will calculate the number of occurrence (St 16) of target frequency.For example, above-mentioned current and before relatively result among the comparison step St 14 of target frequency, when being judged as once when identical, will be again aforesaid operations and can to judge target frequency identical repeatedly.Wherein, when the above-mentioned number of occurrence occurs as certain number of times when above (St 17), be the operating frequency of above-mentioned reverse-phase compressor 1 with the current target frequency setting, thereby make above-mentioned reverse-phase compressor operate (St 18) with the current target frequency.Then, after the operating frequency of setting above-mentioned reverse-phase compressor 1, the number of occurrence of above-mentioned target frequency is reset to zero (St 19).

But, the result who in the number of occurrence determining step (St 17) of above-mentioned target frequency, judges, when not judging identical target frequency more than the certain number of times of process, mean that external condition does not have actual changing, therefore will not change the operating frequency of above-mentioned reverse-phase compressor 1.As mentioned above, when only more than certain number of times, judging identical target frequency, to the operating frequency of reverse-phase compressor be changed, thereby the operating frequency that prevents reverse-phase compressor 1 is under improper mode of operation, for example, the data that transmit of air-conditioner internal error or the sensor of air-conditioner contacts hot-air suddenly when opening the door situation issue and change more.Thus, only change the mode of operation of reverse-phase compressor 1 among the present invention, thereby reduce the sense of discomfort that the user can feel that the noise that etc. causes at substantial load change.

Simultaneously, once judge the current target operating frequency, and after judging the whether variation of operating frequency of corresponding reverse-phase compressor, then judging whether to make above-mentioned reverse-phase compressor to proceed operation (St20).The result who judges in above-mentionedsteps St 20 when continuing the above-mentioned reverse-phase compressor of operation, turns back to the operating procedure (St 11) of above-mentioned reverse-phase compressor, then finishes the control method of the reverse-phase compressor among the present invention when opposite.

In addition, current goal frequency number of times repeatedly is at least more than 2 times, and the operating frequency of reverse-phase compressor is changed, but can according to the decision operating frequency step execution cycle length degree and fully regulate.Wherein, only under the recurrent situation of target frequency certain hour, will the operating frequency of reverse-phase compressor be changed, thereby the operating frequency that prevents reverse-phase compressor change for improper external condition.Therefore, can reduce the sense of discomfort that noise that mode of operation when change of reverse-phase compressor produce and vibration etc. cause.

Claims (3)

1, the control method of the reverse-phase compressor in a kind of air-conditioner is characterized in that, comprising:

Judge the step of the current goal operating frequency of the reverse-phase compressor that needs under the current state repeatedly with the set cycle;

If the number of occurrence of above-mentioned current goal operating frequency is when to be certain number of times above, set the step of above-mentioned current goal operating frequency as the new operating frequency of above-mentioned reverse-phase compressor.

2, the control method of the reverse-phase compressor in the air-conditioner according to claim 1 is characterized in that:

Above-mentioned current goal operating frequency is judged by the capacity of indoor temperature and/or outdoor temperature and/or target temperature and/or indoor set.

3, the control method of the reverse-phase compressor in the air-conditioner according to claim 1 is characterized in that:

The above-mentioned number of occurrence is at least more than 2 times.

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