CN112503724A - Air conditioner defrosting control method for reducing failure rate of four-way valve - Google Patents
Air conditioner defrosting control method for reducing failure rate of four-way valve Download PDFInfo
- Publication number
- CN112503724A CN112503724A CN202011378834.8A CN202011378834A CN112503724A CN 112503724 A CN112503724 A CN 112503724A CN 202011378834 A CN202011378834 A CN 202011378834A CN 112503724 A CN112503724 A CN 112503724A
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- China
- Prior art keywords
- way valve
- air conditioner
- interface
- control method
- compressor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
When the low-temperature air source heat pump (cold water) module unit is used for heating operation in a low-temperature environment, the unit can have different liquid-carrying operation states according to a control method set by the unit. When the unit is defrosted in a liquid running state, the unit must be switched by the four-way valve, and the four-way valve is normally switched immediately without stopping running the compressor, so that a huge impact is brought to the four-way valve. According to the invention, the four-way valve is electrified to enable the air conditioner to start defrosting after the compressor stops running for the second time after the first preset time, so that the pressure difference between the high-pressure high-temperature side of the four-way valve and the low-pressure low-temperature side of the four-way valve is as small as possible before the defrosting of the air conditioner, and the requirement of the reversing minimum pressure difference of the four-way valve is met, so that the pressure of the low-pressure low-temperature side of the four-way valve is higher than that of the normal operation when the air conditioner defrosts, thereby reducing the liquid carrying degree of the refrigerant at the low-pressure side of the.
Description
Technical Field
The invention relates to the technical field of air conditioner defrosting, in particular to an air conditioner defrosting control method for reducing the failure rate of a four-way valve.
Background
In recent years, low-temperature air source heat pump (cold water) module units are widely used for northern coal-to-electricity heating. The national standard stipulates that the unit needs to stably run at the lowest temperature of-30 ℃, and during the heating period of northern users, the actual running environmental temperature of the unit is different from region to region, but the unit runs in a low-temperature environment. When the unit is in heating operation in a low-temperature environment, the unit can have different running states with liquid according to the set control method of the unit.
When the unit is defrosted in a liquid running state, the unit must be switched by the four-way valve, and the four-way valve is normally switched immediately without stopping running the compressor, so that a huge impact is brought to the four-way valve. Referring to fig. 1, in a heating operation in a low temperature environment, since an outdoor environment is low and a system evaporation side pressure is low, the four-way valve together with the E and S tubes of the evaporation side is filled with a low temperature liquid refrigerant, and the C and D tubes together with the condenser of the four-way valve have a high pressure and high temperature gaseous refrigerant. Referring to fig. 1 or 2, when the unit in the heating mode is operated to switch defrosting without stopping the operation of the compressor, the four-way valve slider is switched from the communication E and S pipes to the intermediate process of the communication C and S pipes, the slider can be simultaneously communicated with the E, S and C pipes, at this time, the low-temperature liquid refrigerant of the E and S pipes meets the high-pressure high-temperature gaseous refrigerant of the C pipe, the low-temperature liquid refrigerant is vaporized and rapidly expanded in a narrow space, a great impact force is given to the slider, the slider structural support is damaged, and the four-way valve cannot be switched.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an air conditioner defrosting control method for reducing the failure rate of a four-way valve.
In order to achieve the aim, the invention provides a defrosting control method of an air conditioner for reducing the failure rate of a four-way valve, wherein the air conditioner comprises a compressor, the four-way valve, an outdoor heat exchanger and an indoor heat exchanger; the defrosting control method comprises the following steps: step S1: the air conditioner enters a defrosting preparation stage, and the compressor stops running for a first preset time; step S2: the air conditioner enters a defrosting stage, the compressor is restarted after the compressor is stopped to operate for the first preset time, then the compressor is operated for the second preset time, the fan of the outdoor heat exchanger is stopped to operate after the second preset time, and meanwhile the four-way valve is powered on; step S3: and the air conditioner completes defrosting, the four-way valve is powered off, and meanwhile, a fan for operating the outdoor heat exchanger is started.
Further, the four-way valve comprises a C interface, a D interface, an E interface and an S interface, wherein when the four-way valve is powered off, the D interface is communicated with the E interface, and the S interface is communicated with the C interface.
Further, when the four-way valve is powered on, the interface D is communicated with the interface C, and the interface S is communicated with the interface E.
Further, when the air conditioner runs in a heating mode, the four-way valve is powered off; and when the air conditioner operates in a refrigeration mode, the four-way valve is powered on.
Furthermore, a D interface is connected with the output end of the compressor, a C interface is connected with one end of the outdoor heat exchanger, an E interface is connected with one end of the indoor heat exchanger, and an S interface is connected with the input end of the compressor.
Further, the other end of the indoor heat exchanger and the other end of the outdoor heat exchanger.
Further, the second predetermined time is determined by a time taken for a pressure difference between a high pressure and a low pressure inside the four-way valve to rise to a minimum pressure difference requirement for commutation of the four-way valve when the compressor is restarted.
Further, the second predetermined time is 30 seconds.
Further, the first predetermined time is 60 seconds.
Further, in step S3, whether the air conditioner completes defrosting is judged by the user.
The invention has the beneficial effects that: the compressor is operated again for the second time after the compressor is stopped for the first preset time, the four-way valve is electrified to enable the air conditioner to start defrosting, so that before the air conditioner is defrosted, the pressure difference between the high-pressure high-temperature side of the four-way valve and the low-pressure low-temperature side of the four-way valve is as small as possible, and meanwhile, the reversing minimum pressure difference requirement of the four-way valve is met, when the air conditioner is defrosted, the pressure of the low-pressure low-temperature side of the four-way valve is higher than that of the four-way valve in normal operation, the liquid carrying degree of a.
Drawings
Fig. 1 is a schematic diagram of a heating mode of an air conditioner.
Fig. 2 is a schematic view of a defrosting mode of an air conditioner operation.
Fig. 3 is an operation diagram of components of the air conditioner when the defrosting control method is operated.
Wherein, 1-compressor, 2-four-way valve, 3-indoor heat exchanger, 4-outdoor heat exchanger.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1 or 2, in the present embodiment, an air conditioner defrosting control method for reducing a failure rate of a four-way valve 2, wherein the air conditioner includes a compressor 1, the four-way valve 2, an outdoor heat exchanger 4, and an indoor heat exchanger 3. The four-way valve 2 comprises a port C, a port D, a port E and a port S, wherein the port D is connected with the output end of the compressor 1, the port C is connected with one end of the outdoor heat exchanger 4, the port E is connected with one end of the indoor heat exchanger 3, and the port S is connected with the input end of the compressor 1; the other end of the indoor heat exchanger 3 is connected with the other end of the outdoor heat exchanger 4. When the four-way valve 2 is not electrified, the interface D is communicated with the interface E, and the interface S is communicated with the interface C; on the contrary, when the four-way valve 2 is electrified, the interface D is communicated with the interface C, and the interface S is communicated with the interface E.
Referring to fig. 3, in this embodiment, when the air conditioner needs defrosting during the heating mode, the air conditioner operates according to a defrosting control method, and the defrosting control method includes the following steps:
step S1: the air conditioner enters a defrosting preparation stage, and stops the operation of the compressor 1 which is operating the heating mode for a first predetermined time.
Step S2: and the air conditioner enters a defrosting stage, the compressor 1 is restarted after the compressor 1 stops running for a first preset time, then the compressor 1 is run for a second preset time, the four-way valve 2 is powered after the compressor 1 is run for a second preset time, and meanwhile, the fan of the outdoor heat exchanger 4 is stopped, so that the air conditioner runs in a defrosting mode.
Step S3: and judging whether the air conditioner completes defrosting by a user, if the air conditioner completes defrosting, powering off the four-way valve 2, and starting a fan of the outdoor heat exchanger 4 to enable the air conditioner to run in a heating mode.
In this embodiment, when the four-way valve 2 is powered off, the air conditioner operates in a heating mode, in which a high-temperature and high-pressure refrigerant flows from the output end of the compressor 1 to the indoor heat exchanger 3 through the D-E interface of the four-way valve 2 to be condensed and released, and then the low-temperature and low-pressure refrigerant subjected to condensation and heat release flows from the indoor heat exchanger 3 to the input end of the compressor 1 through the outdoor heat exchanger 4 and the C-S interface of the four-way valve 2 in sequence, at this time, the pressure of the D-E interface of the four-way valve 2 is high, and the pressure of the C.
In this embodiment, in step S1, the compressor 1 is stopped for a first predetermined time to stop delivering the high-temperature and high-pressure refrigerant to the D-E interface of the four-way valve 2, so that the high pressure and the high temperature of the D-E interface of the four-way valve 2 are reduced, and the low pressure of the C-S interface of the four-way valve 2 is increased, so that the temperature difference and the pressure difference between the interfaces (the C-S interface and the D-E interface) on the two sides of the four-way valve 2 are reduced. Because the pressure difference between the two side interfaces required for the commutation after the four-way valve 2 is powered on has the lowest pressure difference requirement, in step S2, the compressor 1 is restarted, then the compressor 1 is operated for a second predetermined time, at this time, the high pressure and the high temperature of the D-E interface of the four-way valve 2 are respectively lower than the pressure and the temperature in normal operation, and the low pressure and the low temperature of the C-S interface of the four-way valve 2 are respectively higher than the pressure and the temperature in normal operation, so that the temperature difference and the pressure difference of the two side interfaces (the C-S interface and the D-E interface) of the four-way valve 2 meet the lowest pressure difference requirement for the commutation of the four-way valve 2 while being as small; further, the four-way valve 2 is electrified and reversed in step S2, the refrigerant on the high-pressure high-temperature side of the four-way valve 2 and the refrigerant on the low-pressure low-temperature side of the four-way valve 2 are mixed with each other, in the mixing process, the expansion effect of the refrigerant on the low-pressure low-temperature side is reduced along with the approach of the refrigerant on the high-pressure high-temperature side, so that the impact of the expansion effect on a sliding block, a sliding block fixing structure and a cavity of the four-way valve 2 is reduced, the stability of the internal structure of the four-way valve 2 is ensured, and the service.
In this embodiment, the second predetermined time is determined according to a time required for a pressure difference between a high-pressure high-temperature side of the four-way valve 2 and a low-pressure low-temperature side of the four-way valve 2 to reach a minimum pressure difference for commutation of the four-way valve 2 when the compressor 1 is restarted, wherein the first predetermined time is 60 seconds, and the second predetermined time is 30 seconds.
In this embodiment, in step S2, the fan of the outdoor heat exchanger 4 is stopped when the four-way valve 2 is energized and the direction is changed, so that the heat radiation speed of the outdoor heat exchanger 4 is reduced, and the defrosting of the outdoor heat exchanger 4 is accelerated.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. The utility model provides a reduce air conditioner defrosting control method of cross valve fault rate, wherein, the air conditioner includes compressor (1), cross valve (2), outdoor heat exchanger (4) and indoor heat exchanger (3), its characterized in that: the defrosting control method comprises the following steps:
step S1: the air conditioner enters a defrosting preparation stage, and the compressor (1) stops running for a first preset time;
step S2: the air conditioner enters a defrosting stage, the compressor (1) is restarted after the compressor (1) is stopped to operate for the first preset time, then the compressor (1) is operated for the second preset time, the fan of the outdoor heat exchanger (4) is stopped to operate after the second preset time, and meanwhile the four-way valve (2) is powered on;
step S3: and the air conditioner finishes defrosting, the four-way valve (2) is powered off, and meanwhile, a fan for operating the outdoor heat exchanger (4) is started.
2. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 1, is characterized in that: the four-way valve (2) comprises a C interface, a D interface, an E interface and an S interface, wherein when the four-way valve (2) is powered off, the D interface is communicated with the E interface, and the S interface is communicated with the C interface.
3. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 2, characterized in that: when the four-way valve (2) is electrified, the interface D is communicated with the interface C, and the interface S is communicated with the interface E.
4. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to the claim 2 or 3, is characterized in that: when the air conditioner operates in a heating mode, the four-way valve (2) is powered off; and when the air conditioner runs in a refrigeration mode, the four-way valve (2) is electrified.
5. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 2, characterized in that: the interface D is connected with the output end of the compressor (1), the interface C is connected with one end of the outdoor heat exchanger (4), the interface E is connected with one end of the indoor heat exchanger (3), and the interface S is connected with the input end of the compressor (1).
6. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 5, characterized in that: the other end of the indoor heat exchanger (3) and the other end of the outdoor heat exchanger (4).
7. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 1, is characterized in that: the second predetermined time is determined by the time taken for the pressure difference between the high pressure and the low pressure inside the four-way valve (2) to rise to the minimum pressure difference requirement for commutation of the four-way valve (2) when the compressor (1) is restarted.
8. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 7, characterized in that: the second predetermined time is 30 seconds.
9. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 1, is characterized in that: the first predetermined time is 60 seconds.
10. The air conditioner defrosting control method for reducing the failure rate of the four-way valve according to claim 1, is characterized in that: in step S3, whether the air conditioner completes defrosting is judged by the user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011378834.8A CN112503724A (en) | 2020-12-01 | 2020-12-01 | Air conditioner defrosting control method for reducing failure rate of four-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011378834.8A CN112503724A (en) | 2020-12-01 | 2020-12-01 | Air conditioner defrosting control method for reducing failure rate of four-way valve |
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| Publication Number | Publication Date |
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| CN112503724A true CN112503724A (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011378834.8A Pending CN112503724A (en) | 2020-12-01 | 2020-12-01 | Air conditioner defrosting control method for reducing failure rate of four-way valve |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001174112A (en) * | 1999-12-21 | 2001-06-29 | Toshiba Kyaria Kk | Air conditioner |
| CN103968494A (en) * | 2013-01-25 | 2014-08-06 | 珠海格力电器股份有限公司 | Control method of air-conditioning system and air-conditioning system |
| CN104776570A (en) * | 2015-03-30 | 2015-07-15 | 广东美的制冷设备有限公司 | Fault detection method and device of air conditioner system |
| CN110017530A (en) * | 2019-03-01 | 2019-07-16 | 刘明生 | A kind of household trilogy supply heat pump unit |
| CN111981641A (en) * | 2020-08-20 | 2020-11-24 | 青岛海信日立空调系统有限公司 | Air conditioner defrosting control method and air conditioner system |
-
2020
- 2020-12-01 CN CN202011378834.8A patent/CN112503724A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001174112A (en) * | 1999-12-21 | 2001-06-29 | Toshiba Kyaria Kk | Air conditioner |
| CN103968494A (en) * | 2013-01-25 | 2014-08-06 | 珠海格力电器股份有限公司 | Control method of air-conditioning system and air-conditioning system |
| CN104776570A (en) * | 2015-03-30 | 2015-07-15 | 广东美的制冷设备有限公司 | Fault detection method and device of air conditioner system |
| CN110017530A (en) * | 2019-03-01 | 2019-07-16 | 刘明生 | A kind of household trilogy supply heat pump unit |
| CN111981641A (en) * | 2020-08-20 | 2020-11-24 | 青岛海信日立空调系统有限公司 | Air conditioner defrosting control method and air conditioner system |
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Application publication date: 20210316 |