CN1987235B - Defrost operation control method for heating and cooling two-purpose air conditioner - Google Patents
Defrost operation control method for heating and cooling two-purpose air conditioner Download PDFInfo
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- CN1987235B CN1987235B CN2005101225342A CN200510122534A CN1987235B CN 1987235 B CN1987235 B CN 1987235B CN 2005101225342 A CN2005101225342 A CN 2005101225342A CN 200510122534 A CN200510122534 A CN 200510122534A CN 1987235 B CN1987235 B CN 1987235B
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Abstract
A defrosting control method for the air conditioner with both refrigerating and heating functions includes such steps as starting defrost mode when the air conditioner is running in heating mode, lowering the frequency of compressor to a target value, switching 4-way valve, increasing the frequency of compressor to a defrosting frequency, increasing the openness of expansion valve to a value needed by defrosting, lowering the frequency of compressor to a minimal value while driving outdoor fan, switching 4-way valve while increasing the frequency of compressor, and controlling compressor and expansion valve according to the frequency and openness set up by heating instruction.
Description
Technical field
The present invention relates to the Defrost operation control method of heating and cooling two-purpose air conditioner.More detailed says, the present invention relates to: move under the Defrost operation pattern in order to make air-conditioner, and need be when refrigeration mode is changed flowing to of refrigerant, switch cubic valve earlier, the running frequency of controlling compressor then makes its rising, after after a while, increases the aperture of expansion valve afterwards, thereby can reduce the variation of air-conditioner load to greatest extent, and can prevent that the liquid condition refrigerant from flowing into the Defrost operation control method of heating and cooling two-purpose air conditioner of the phenomenon of compressor.
Background technology
Heating and cooling two-purpose air conditioner has refrigerating function and system heating function.Detailed says, the warm principles illustrated of the refrigeration of above-mentioned heating and cooling two-purpose air conditioner is as follows.That is,, absorb the heat of the interior space along with the evaporation of refrigerant, and the heat that absorbs is discharged to outdoor, thereby carry out refrigerating function.On the contrary, the circular flow of changing above-mentioned refrigerant to, make its reverse flow, make the heat of the above-mentioned refrigerant absorption chamber external space, and the heat that absorbs emitted to indoor, thereby carry out the system heating function.Below, be example with the heating and cooling two-purpose air conditioner, the cyclic process of refrigerant is described.Fig. 1 is the drawing that shows the refrigerant cyclic process of heating and cooling two-purpose air conditioner.
At first, the off-premises station that is connected with indoor set is provided with following several parts: the compressor 30 of compression refrigerant; Be arranged on the output of above-mentioned compressor, thereby can change the cubic valve 40 of the circulating path of refrigerant.In addition, the present invention also is provided with lower member: a side is connected with above-mentioned cubic valve 40, and in outdoor outdoor heat exchanger 20 of carrying out heat exchange; One side is connected with above-mentioned cubic valve 40, and at the indoor indoor heat exchanger 10 that carries out heat exchange; Be arranged on the expansion valve 50 between the opposite side of the opposite side of above-mentioned indoor heat exchanger 10 and outdoor heat exchanger 20.
Then, following several parts are set on the above-mentioned indoor heat exchanger 10: the indoor temperature transmitter 11 of measuring indoor temperature; Measure the indoor heat exchanger temperature sensor 12 of indoor heat exchanger 10 temperature.In addition, following several parts are set on the above-mentioned outdoor heat exchanger 20: the outdoor temperature sensor 21 of measuring outdoor temperature; Measure the outdoor heat exchanger temperature sensor 22 of the temperature of outdoor heat exchanger 20.
Below, the refrigerant circulating path to aforesaid heating and cooling two-purpose air conditioner is described in detail.
At first, when air-conditioner is worked under the refrigerating operaton pattern (representing) with solid arrow, the refrigerant of compression in compressor 30, to flow into outdoor heat exchanger 20 from cubic valve 40, thereby emit heat, above-mentioned then refrigerant flow to expansion valve 50, again be provided to indoor heat exchanger 10 afterwards, and flash to gaseous state, and in evaporation process, carry out heat exchange (refrigerating function), thereby the heat in the absorption chamber, above-mentioned afterwards refrigerant is provided to compressor 30 again by cubic valve 40, thereby finishes once circulation.
On the contrary, when air-conditioner is worked under the system warming operation mode (the with dashed lines arrow is represented), the refrigerant of compression in compressor 30, to flow into indoor heat exchanger 10 from cubic valve 40, thereby emit heat (system heating function), above-mentioned then refrigerant flow to expansion valve 50, again be provided to outdoor heat exchanger 20 afterwards, and flash to gaseous state, and in evaporation process, carry out heat exchange, thereby the heat that absorption chamber is outer, above-mentioned afterwards refrigerant is provided to compressor 30 again by cubic valve 40, thereby finishes once circulation.
Especially, when heating and cooling two-purpose air conditioner is worked, in the process of above-mentioned outdoor heat exchanger 20 heat outside absorption chamber,, will make the peripheral dewfall of outdoor heat exchanger 20 under the system warming operation mode, thereby produce the phenomenon of freezing along with the decline of ambient air temperature., because above-mentioned ice of forming, will the temperature of the air by indoor heat exchanger be descended here, therefore, in order to prevent the appearance of the problems referred to above, the air-conditioner operation that will defrost.
That is, whether the air-conditioner temperature that will detect above-mentioned outdoor heat exchanger 20 continues for some time below freezing.And, judge whether the needs operation that defrosts according to detected result.Therefore, air-conditioner will utilize parts such as outdoor temperature sensor 21, outdoor heat exchanger temperature sensor 22, indoor temperature transmitter 11, indoor heat exchanger temperature sensor 12 to grasp the time point of defrosting mode operation.
Fig. 2 is the figure of demonstration according to the Defrost operation control method of the heating and cooling two-purpose air conditioner of conventional art.Below, with reference to Fig. 2, the problem of conventional art is described.
The indoor set microprocessor obtains the temperature of indoor temperature and indoor heat exchanger, and the off-premises station microprocessor obtains outdoor temperature, outdoor heat exchanger temperature and compressor discharge temperature.At this moment, above-mentioned indoor set microprocessor and off-premises station microprocessor interconnect by the data conveyer line.(S0)
When above-mentioned outdoor piping temperature below uniform temperature (T degree), and the warm mode operation time of system surpasses under the situation of certain hour t6, air-conditioner will start the Defrost operation pattern.At this moment, air-conditioner at first reduces the compressor operating frequency, switches cubic valve through time point second at very first time t1 then, thereby makes refrigerant with the refrigerating operaton mode cycle, and then the temperature of outdoor heat exchanger and surrounding air is risen.(S1)
Switch time point at cubic valve, flow into indoor phenomenon in order to prevent refrigerant, air-conditioner will stop the operation of indoor/outdoor fan, increase the aperture of expansion valve simultaneously.Then, switch time point through the second time t2 after second from cubic valve, air-conditioner is increased to the Defrost operation frequency with the compressor operating frequency, and the frost that therefore is created on the outdoor heat exchanger will begin to melt.(S2，S3)
After passing through certain hour again, air-conditioner is reduced to low-limit frequency with compressor frequency again, and the operation outdoor fan.Through the 3rd, the 4th (t3+t4) second, air-conditioner will switch cubic valve, increase the running frequency of compressor simultaneously after the outdoor fan operation.(S4，S5)
Switch behind the above-mentioned cubic valve through the 5th t5 time point second, air-conditioner begins with the operation of system warming operation mode.(S6)
But there are the following problems for aforesaid Defrost operation control method according to conventional art.That is, after compressor frequency is reduced to the minimum operation frequency, when switching cubic valve, the aperture of expansion valve will sharply increase, so the load variations of air-conditioner can be very obvious.
And, in order to start defrosting mode, switch the refrigerant circulation rapidly from the system warming operation mode to the refrigerating operaton pattern, therefore make the liquid condition refrigerant in the indoor heat exchanger be fed directly to compressor easily, cause the performance that reduces compressor.
Summary of the invention
The present invention proposes in order to solve the above problems, and purpose provides the Defrost operation control method of the heating and cooling two-purpose air conditioner of the durability that can improve compressor.
To achieve these goals, Defrost operation control method according to heating and cooling two-purpose air conditioner of the present invention, it is characterized in that comprising following several steps: when air-conditioner is worked under the system warming operation mode, along with starting the Defrost operation pattern by the off-premises station microprocessor, running frequency with the control compressor makes it drop to the 1st step of desired value; Through switching cubic valve (4Way Valve) behind the certain hour t1, make 2nd step of refrigerant with the refrigeration mode circulation; Behind above-mentioned cubic valve switching time point process certain hour t2, the running frequency of control compressor makes it rise to the 3rd step of Defrost operation frequency; In a single day the running frequency of above-mentioned compressor reaches the Defrost operation frequency, the 4th step of the aperture B1 when expansion valve opening is increased to the Defrost operation pattern; After the frequency of above-mentioned compressor reduced to low-limit frequency, the 5th step of operation outdoor fan; Above-mentioned outdoor fan brings into operation, and behind certain hour (t3+t4), switches cubic valve, and increases the 6th step of the running frequency of compressor; Switch behind the above-mentioned cubic valve through certain hour t5, according to frequency and the aperture that the warm action command of user's system is set, the 7th step of control compressor and expansion valve.
As mentioned above, Defrost operation control method according to heating and cooling two-purpose air conditioner of the present invention has following effect: after switching cubic valve, make the running frequency of compressor slowly rise to the Defrost operation frequency, and through just increasing the aperture of expansion valve behind the certain hour, thereby can reduce the variation of air-conditioner load to greatest extent, and can prevent that the liquid condition refrigerant from flowing into the phenomenon of compressor, therefore can improve durability of products.
Description of drawings
Fig. 1 is the drawing that shows the refrigerant cyclic process of heating and cooling two-purpose air conditioner.
Fig. 2 is the figure of demonstration according to the Defrost operation control method of the heating and cooling two-purpose air conditioner of conventional art.
Fig. 3 is the figure that shows according to the Defrost operation control method of heating and cooling two-purpose air conditioner of the present invention.
The critical piece description of reference numerals
10: indoor heat exchanger 20: outdoor heat exchanger
11: indoor temperature transmitter 12: the indoor heat exchanger temperature sensor
21: outdoor temperature sensor 22: the outdoor heat exchanger temperature sensor
30: compressor 40: cubic valve
50: expansion valve
The specific embodiment
Below, with reference to the accompanying drawings, preferred embodiment of the present invention is described in detail.
Simplified summary is of the present invention to be constructed as follows.As shown in Figure 1, in air-conditioner, compressor, outdoor heat exchanger, indoor heat exchanger interconnect by pipe arrangement.Detailed says, refrigerant will carry out state variation by above-mentioned pipe arrangement, thereby can absorb heat that room air contains or emit heat to room air.Therefore, can freeze operation or the warm operation of system of air-conditioner.
Especially, in the system warming operation mode, at first switch cubic valve according to the control of control part, the refrigerant of the high-temperature high-pressure state that compresses in compressor will circulate.And above-mentioned refrigerant will be discharged hot blast from indoor heat exchanger in the process of circulation, then discharge cold wind from outdoor heat exchanger.At this moment, in order to prevent to generate the phenomenon of frost on above-mentioned outdoor heat exchanger, above-mentioned control part will be controlled air-conditioner, make its operation that defrosts.
Here, the Defrost operation pattern is defined as follows, that is, when air-conditioner moves under the system warming operation mode, for the frost that generates on the heat-exchange surface of removing off-premises station, in the regular hour section, air-conditioner will move under the refrigerating operaton pattern.Said process is the Defrost operation pattern.Detailed says, in the process of carrying out above-mentioned refrigeration operation, outdoor heat exchanger will be discharged warm braw, thereby can melt the frost that is created on the heat-exchange surface.
Below, with reference to Fig. 3, more detailed explanation is according to Defrost operation control method of the present invention.
When the user selects to make warming operation mode, the indoor set microprocessor will send control instruction according to user's operational order.At this moment, the off-premises station microprocessor will receive the data-signals such as compressor frequency of selected system warming operation mode by the data conveyer line.
According to above-mentioned data-signal, above-mentioned off-premises station microprocessor is used for decision voltage, the frequency data of driven compressor.Then, according to the Data Control compressor of decision, thereby refrigerant is circulated by pipe arrangement.Afterwards, air-conditioner is by the heat exchanging process of indoor set/off-premises station, to indoor discharge hot blast.(P0)
In the process that air-conditioner moves under the warm pattern of above-mentioned system, above-mentioned off-premises station microprocessor will make air-conditioner start the Defrost operation pattern.At this moment, the running frequency of compressor is descended.(P1)
After the running frequency of compressor is reduced to desired value, will switch cubic valve second, the circulation of refrigerant is carried out to opposite direction, that is, above-mentioned refrigerant be circulated with refrigeration mode through very first time t1.
At the switching time point of cubic valve, make indoor fan and outdoor fan out of service, thereby prevent the inflow and the discharge of air.(P2)
Switching time point at cubic valve after second, makes the compressor operating frequency rise to Defrost operation frequency A1 through the second time t2.In the present embodiment, above-mentioned Defrost operation frequency ratio above-mentioned compressor running frequency is high 5 grades, and describes as example.At this moment, frequency should rise with the speed of per second f1.(P3)
If in a single day the above-mentioned compressor running frequency reaches the Defrost operation frequency, the aperture B1 when air-conditioner will make the aperture of expansion valve increase to the Defrost operation pattern.In the prior art, owing to the switching time point at cubic valve, the aperture of expansion valve also together increases, thereby the load variations of air-conditioner is increased severely.But, in the present invention, switch above-mentioned cubic valve, and after the rising of compressor operating frequency, just increase the aperture of expansion valve, therefore can not cause the rapid variation of air-conditioner load.
And when air-conditioner started Defrost operation pattern of the present invention, through behind the certain hour, expansion valve began expansive working, therefore can not make the refrigerant of liquid condition flow into compressor from the switching time point of cubic valve.
Then,, again compressor frequency is reduced to low-limit frequency through behind the certain hour, and the operation outdoor fan, thereby by discharging hot blast, can prevent that therefore the surface from generating the phenomenon of frost, perhaps can remove the frost that has generated with the heat exchange of outdoor air.(P4，P5)
Through the 3rd, the 4th time (t3+t4), will switch cubic valve after the outdoor fan operation, and increase the running frequency of compressor, thereby make refrigerant to make warm mode cycle.At this moment, indoor for cold air is discharged to, before cubic valve switches time point, indoor fan will be in halted state.But under the warm pattern of system, refrigerant is after circulation a period of time, and above-mentioned indoor fan will rerun, thereby can be to indoor discharge hot gas.(P6)
Through the 5th t5 time point, compressor will be to move with the corresponding setpoint frequency of the selected system warming operation mode of user after switching above-mentioned cubic valve.In addition, control expansion valve simultaneously, make it reach the aperture of setting.The operation that like this, once defrosts will be finished smoothly.
As mentioned above, with reference to accompanying drawing, the Defrost operation control method according to heating and cooling two-purpose air conditioner of the present invention is illustrated.But right of the present invention is not confined to aforesaid embodiment or drawing.Right of the present invention should be decided by the record content in claims.Under the situation that does not exceed the technology of the present invention scope of putting down in writing in claims, the technical staff of relevant industries can carry out various deformation and modification to embodiments of the invention.
Claims (5)
1. the Defrost operation control method of a heating and cooling two-purpose air conditioner is characterized in that, comprising:
When air-conditioner was worked under the system warming operation mode, along with starting the Defrost operation pattern by the off-premises station microprocessor, the running frequency with the control compressor made it drop to the 1st step of desired value;
Switch cubic valve through the very first time (t1) back, make 2nd step of refrigerant with the refrigeration mode circulation;
From above-mentioned cubic valve switch time point through second time (t2) after, the running frequency of control compressor makes it rise to the 3rd step of Defrost operation frequency;
In a single day the running frequency of above-mentioned compressor reaches the Defrost operation frequency, the 4th step of the aperture when expansion valve opening is increased to the Defrost operation pattern (B1);
After the frequency of above-mentioned compressor reduced to low-limit frequency, the 5th step of operation outdoor fan;
Above-mentioned outdoor fan brings into operation, and after the 3rd, the 4th time (t3+t4), switches cubic valve, and increases the 6th step of the running frequency of compressor;
Switch behind the above-mentioned cubic valve through the 5th time (t5), according to frequency and the aperture that the warm action command of user's system is set, the 7th step of control compressor and expansion valve.
2. the Defrost operation control method of heating and cooling two-purpose air conditioner according to claim 1 is characterized in that:
For inflow and the discharge that prevents air, above-mentioned the 2nd step also comprises: from the switching time point of above-mentioned cubic valve, stop the process of the operation of indoor fan and outdoor fan.
3. the Defrost operation control method of heating and cooling two-purpose air conditioner according to claim 1 is characterized in that:
In above-mentioned the 3rd step, the above-mentioned compressor running frequency will rise with certain speed (f1).
4. the Defrost operation control method of heating and cooling two-purpose air conditioner according to claim 1 is characterized in that:
Above-mentioned the 6th step also comprises: switch above-mentioned cubic valve, through certain hour, will move the process of indoor fan after the refrigerant circulation under the warm pattern of system forms.
5. the Defrost operation control method of heating and cooling two-purpose air conditioner according to claim 1 is characterized in that:
In above-mentioned the 7th step, reach the aperture that sets according to the warm action command of user's system up to the aperture of above-mentioned expansion valve, compressor and expansion valve will be activated control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101225342A CN1987235B (en) | 2005-12-22 | 2005-12-22 | Defrost operation control method for heating and cooling two-purpose air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101225342A CN1987235B (en) | 2005-12-22 | 2005-12-22 | Defrost operation control method for heating and cooling two-purpose air conditioner |
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| Publication Number | Publication Date |
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| CN1987235A CN1987235A (en) | 2007-06-27 |
| CN1987235B true CN1987235B (en) | 2010-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2005101225342A Expired - Fee Related CN1987235B (en) | 2005-12-22 | 2005-12-22 | Defrost operation control method for heating and cooling two-purpose air conditioner |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101571339B (en) * | 2008-04-29 | 2012-08-29 | 博西华家用电器有限公司 | Refrigerator defrosting control method and refrigerator applying same |
| CN101726072B (en) * | 2008-10-24 | 2013-01-30 | 海尔集团公司 | Control mode of low-temperature heating of variable frequency air conditioner |
| CN101957110A (en) * | 2010-07-02 | 2011-01-26 | 海信科龙电器股份有限公司 | Method for defrosting heat pump air conditioner using parallel flow heat exchanger |
| CN102062504A (en) * | 2010-12-24 | 2011-05-18 | 中国扬子集团滁州扬子空调器有限公司 | Split type heat pump frequency conversion air conditioner which is defrosting nonstop machine and defrosting control method |
| CN102997525B (en) * | 2011-09-09 | 2014-12-10 | 珠海格力电器股份有限公司 | Air conditioner and defrosting method and device thereof |
| CN103123194A (en) * | 2012-03-31 | 2013-05-29 | 宁波奥克斯电气有限公司 | Defrosting method of multi-combination type air conditioning unit |
| CN104296434A (en) * | 2014-10-29 | 2015-01-21 | 珠海格力电器股份有限公司 | Defrosting control method and system of air conditioner |
| CN106288153B (en) * | 2016-08-01 | 2019-07-23 | 广东美的暖通设备有限公司 | A kind of defrosting control method of air conditioner |
| CN107023965A (en) * | 2017-04-13 | 2017-08-08 | 广东美的暖通设备有限公司 | Air-conditioning system and its dehumidification control method |
| CN107289662B (en) * | 2017-07-17 | 2019-07-19 | 河南恒天润景环境科技有限公司 | A kind of control method of low-temperature air source heat pump unit outdoor machine fan motor |
| CN107883522A (en) * | 2017-11-10 | 2018-04-06 | 广东志高暖通设备股份有限公司 | The control method and device of outdoor fan in a kind of frequency conversion heat pump air-conditioning |
| CN108826772B (en) * | 2018-05-03 | 2020-11-17 | 广东美的暖通设备有限公司 | Defrosting control method and system |
| CN109210682A (en) * | 2018-09-10 | 2019-01-15 | 青岛海尔空调器有限总公司 | The self-cleaning control method and device of air-conditioning, air conditioner, storage medium |
| CN110906581A (en) * | 2019-12-03 | 2020-03-24 | 无锡同方人工环境有限公司 | Defrosting method of variable-frequency air source heat pump unit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5669222A (en) * | 1996-06-06 | 1997-09-23 | General Electric Company | Refrigeration passive defrost system |
| CN1467462A (en) * | 2002-07-03 | 2004-01-14 | Lg电子株式会社 | Defrosting apparatus of air conditioner and method thereof |
-
2005
- 2005-12-22 CN CN2005101225342A patent/CN1987235B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5669222A (en) * | 1996-06-06 | 1997-09-23 | General Electric Company | Refrigeration passive defrost system |
| CN1467462A (en) * | 2002-07-03 | 2004-01-14 | Lg电子株式会社 | Defrosting apparatus of air conditioner and method thereof |
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| Publication number | Publication date |
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| CN1987235A (en) | 2007-06-27 |
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