CN211575632U - Heat pump air conditioning system - Google Patents
Heat pump air conditioning system Download PDFInfo
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- CN211575632U CN211575632U CN201922201383.XU CN201922201383U CN211575632U CN 211575632 U CN211575632 U CN 211575632U CN 201922201383 U CN201922201383 U CN 201922201383U CN 211575632 U CN211575632 U CN 211575632U
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Abstract
The utility model provides a heat pump air conditioning system, the utility model discloses an air conditioning system when heating, in order to prevent outdoor heat exchanger frosting, the switching-over through the cross valve makes heat pump system realize the defrosting operation. When the defrosting operation is carried out, in order to ensure the indoor comfort, the indoor heat supply is ensured by increasing the electric heater. The utility model discloses an air conditioning system changes the frost process heating, through the switch of controlling first, second evaporimeter, first, second electric heater and first, second evaporation fan, has reduced because of the heating process changes the fluctuation that the frost leads to the room temperature that appears, can prolong simultaneously and change the frost time, makes the off-premises station defrosting more complete, has avoided getting into again behind the heating mode because of the off-premises station frosts and influences the heat transfer effect, improves the operating efficiency that heats. Therefore, the falling range of the room temperature in the heating defrosting process is reduced, the outdoor unit is defrosted cleanly and reliably, and the heating operation efficiency is improved.
Description
Technical Field
The utility model relates to a heat pump air conditioning system particularly, relates to a vehicle heat pump air conditioning system.
Background
In the heating state of the traditional heat pump air conditioner, the outdoor unit is easy to frost in a low-temperature environment, so that the performance of the heat exchanger of the outdoor unit is seriously deteriorated, the indoor heating effect is poor, and the energy efficiency is low. Therefore, in a heating state, the system needs to perform periodic defrosting treatment on the outdoor unit according to certain judgment conditions, and if the surface of the outdoor unit is frosted seriously, the time consumption for defrosting is prolonged in order to remove the frost layer of the outdoor unit as much as possible. Because the defrosting process of the heat pump air conditioner adopts a refrigeration mode to send high-temperature and high-pressure gas to the outdoor unit, the temperature of the indoor unit pipe is low at the moment, and the traditional method is to shut down the indoor fan to prevent low-temperature air from blowing indoors and aggravate the degree of room temperature reduction. Particularly for a track air conditioner, the required heating amount is large, once the heating is stopped, the temperature in the car is rapidly reduced, and great discomfort is brought to passengers.
Chinese patent document CN201810339279.4 discloses an efficient track heat pump air conditioning system and a defrosting method thereof, which adopts a dual-system mode to make two systems alternately defrost. The system has the advantages that the heating state can be kept during defrosting, but the system is too large due to the design of the double systems, and when the first system is in defrosting and the second system is in heating state, the second system can be frosted more seriously, so that the next defrosting time is prolonged.
Chinese patent document CN201310145255.2 discloses an air conditioning system with a defrosting device and a defrosting method thereof, which can defrost an outdoor unit without changing the operation mode of an indoor unit by adding a defrosting heat exchanger, and can not change the heating state of an indoor heat exchanger by alternately defrosting the outdoor heat exchanger and the defrosting heat exchanger. However, the indoor heat exchanger is also in a heating state, so that the defrosting time required by the outdoor heat exchanger or the defrosting heat exchanger is longer.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a heat pump air conditioning system and a control method thereof, so as to solve at least one of the following problems: the falling range of the room temperature in the heating defrosting process is reduced, the outdoor unit is defrosted cleanly and reliably, and the heating operation efficiency is improved.
Specifically, the method comprises the following steps: a heat pump air conditioning system comprises a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a second indoor heat exchanger and a four-way reversing valve; the method is characterized in that:
a first branch is arranged between the exhaust port of the compressor and the second port of the four-way reversing valve; a sixth branch is arranged between the fourth port of the four-way reversing valve and the air inlet of the compressor, and a gas-liquid separation device is arranged on the sixth branch; one end of the second branch is communicated with a third port of the four-way reversing valve, one end of the fifth branch is communicated with a first port of the four-way reversing valve, and a third branch and a fourth branch are connected in parallel between the other end of the second branch and the other end of the fifth branch; the fifth branch is provided with an outdoor heat exchanger and a throttling device; the third branch is provided with a first indoor heat exchanger, and the third branch is provided with a first inlet valve and/or a first outlet valve for controlling the opening or closing of an inlet and/or an outlet of the first indoor heat exchanger; a second indoor heat exchanger is arranged on the fourth branch, and a second inlet valve and/or a second outlet valve for controlling the opening or closing of an inlet and/or an outlet of the second indoor heat exchanger are/is arranged on the fourth branch; the first heater can replace the first indoor heat exchanger to provide heat for the room; and/or a second heater which can replace the second indoor heat exchanger to provide heat for the indoor.
Preferably, the first branch is provided with a first pressure sensor for detecting the pressure of the exhaust port of the compressor; and/or a second pressure sensor for detecting the pressure of the air inlet of the compressor is arranged on the sixth branch.
Preferably, the first branch may be provided with a check valve.
Preferably, a shock absorbing hose is arranged between the air inlet of the compressor and the vapor-liquid separation device.
Preferably, the utility model discloses a throttling arrangement can be electronic expansion valve, and outdoor heat exchanger is the condenser, and first indoor heat exchanger is first evaporimeter, and the indoor heat exchanger of second is the second evaporimeter.
Preferably, the first heater is disposed adjacent to the first indoor heat exchanger such that an air flow, which may be generated by a first evaporation fan of the first indoor heat exchanger, is blown toward the first heater, thereby generating hot air to be supplied into the room: and/or the second heater is arranged adjacent to the second indoor heat exchanger, so that the airflow generated by the second evaporation fan can be blown to the second heater, and the hot air provided to the indoor space is generated.
Preferably, the utility model discloses a heat pump air conditioning system can be used to rail vehicle, indoor indicating in the carriage, outdoor being outside the carriage, first indoor heat exchanger, the indoor heat exchanger of second are located the both sides of vehicle, and the air outlet is located the intermediate position of vehicle in the car.
In addition the utility model provides a heat pump air conditioning system's control method, air conditioning system does the utility model discloses arbitrary air conditioning system, control method includes the switching-over through the control cross valve, first inlet valve, first outlet valve, second inlet valve, second outlet valve, first evaporation fan, second evaporation fan, first heater, opening and closing of second heater makes air conditioning system switch between heating operation mode and defrosting operation mode.
Preferably, the heating operation mode is specifically:
the first inlet valve, the first outlet valve, the second inlet valve, the second outlet valve, the first evaporation fan and the second evaporation fan are controlled to be in an open state, and the first heater and the second heater are controlled to be in a closed state;
high-temperature and high-pressure refrigerant gas discharged from the compressor passes through the four-way reversing valve and then is subjected to heat exchange through the first evaporator and the second evaporator;
indoor air is sent to the first evaporator and the second evaporator through the first evaporation fan and the second evaporation fan for heat exchange and temperature rise and then is sent back to the room from the air outlet duct to form indoor air circulation;
the high-temperature and high-pressure refrigerant gas entering the first evaporator and the second evaporator is cooled by indoor air to be supercooled liquid, and then is throttled and depressurized through a throttling device;
the two-phase fluid after throttling and pressure reduction enters an outdoor heat exchanger for heat absorption and vaporization, and enters a gas-liquid separation device through a four-way reversing valve; the gas separated by the gas-liquid separation device enters a compressor and is compressed into high-temperature and high-pressure refrigerant gas by the compressor, and a primary heating cycle is completed.
Preferably, the defrosting operation mode specifically includes:
the first heater is controlled to be in an open state, the first inlet valve, the first outlet valve, the second evaporation fan and the second heater are in a closed state, and the four-way reversing valve is used for reversing;
high-temperature and high-pressure refrigerant gas discharged from the compressor flows to the outdoor heat exchanger through the four-way reversing valve, so that a frost layer starts to absorb heat and melt;
cooling and condensing the high-temperature and high-pressure refrigerant gas, and then entering a throttling device for throttling and depressurizing;
the two-phase fluid after throttling and pressure reduction enters a second indoor heat exchanger, a second evaporation fan is in a closed state, and a second heater is closed;
the first evaporation fan and the first electric heater are kept in an open state, and hot air is conveyed to the room;
the two-phase fluid absorbs heat and is vaporized through a second evaporator and enters a gas-liquid separator through a four-way reversing valve; the refrigerant gas separated by the gas-liquid separator enters a suction cavity of the compressor, the refrigerant gas with low pressure and overheat is compressed into the refrigerant gas with high temperature and high pressure again by the compressor, and a defrosting cycle is completed.
Preferably, the present invention can determine the start and end of defrosting control according to the tube temperature and pressure of the outdoor heat exchanger. If frost forms, the flow of refrigerant of the outdoor heat exchanger (condenser) can be influenced, the temperature and the pressure of the pipe can be changed, the time when the defrosting is needed and the defrosting is finished can be judged according to the change of the temperature and the pressure of the pipe, and the specific numerical value can be determined according to experience or experiments.
Has the advantages that:
the utility model discloses a heat pump air conditioning system and control method thereof, at the heating defrosting process, through the switch of control both sides evaporimeter, both sides electrical heating and both sides evaporation fan, reduced because of the heating process appears changing the frost and lead to the fluctuation of room temperature, can prolong the defrosting time simultaneously and make the off-premises station defrosting more complete, avoided entering again behind the heating mode because of the off-premises station frosts and influence the heat transfer effect, improve the operating efficiency that heats.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
FIG. 1: the utility model discloses a heat pump air conditioning system's schematic diagram
FIG. 2: the utility model discloses a heat pump air conditioning system's operation system refrigerant flow direction schematic diagram during mode that heats
FIG. 3: the utility model discloses a system's refrigerant flow direction schematic diagram during defrosting mode of heat pump air conditioning system's operation
Wherein, 1-compressor; 2-a first pressure sensor; 3-a one-way valve; a 4-four-way reversing valve; 5-outdoor heat exchanger; 6-outdoor heat exchanger fan; 7-a throttling device; 8-a first indoor heat exchanger; 9-a second indoor heat exchanger; 10-a first evaporation fan; 11-a second evaporation fan; 12-a first heater; 13-a second heater; 14-a second pressure sensor; 15-a gas-liquid separation device; 16-shock absorbing hose.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various structures, these structures should not be limited by these terms. These terms are used to distinguish one structure from another structure. Thus, a first structure discussed below may be termed a second structure without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It is to be understood by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present disclosure and are, therefore, not intended to limit the scope of the present disclosure.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings 1-3:
as shown in fig. 1, the heat pump air conditioning system of the present invention is schematically shown, and the air conditioning system includes a compressor 1, an outdoor heat exchanger 5, a first indoor heat exchanger 8, a second indoor heat exchanger 9, and a four-way reversing valve 4; a first branch is arranged between the exhaust port of the compressor 1 and the second port of the four-way reversing valve 4; a sixth branch is arranged between the fourth port of the four-way reversing valve 4 and the air inlet of the compressor 1, and a gas-liquid separation device 15 is arranged on the sixth branch; one end of the second branch is communicated with a third port of the four-way reversing valve 4, one end of the fifth branch is communicated with a first port of the four-way reversing valve 4, and a third branch and a fourth branch are connected in parallel between the other end of the second branch and the other end of the fifth branch; the fifth branch is provided with an outdoor heat exchanger 5 and a throttling device 7;
the third branch is provided with a first indoor heat exchanger 8, and the third branch is provided with a first inlet valve a and/or a first outlet valve b for controlling the opening or closing of an inlet and/or an outlet of the first indoor heat exchanger 8; a second indoor heat exchanger 9 is arranged on the fourth branch, and a second inlet valve c and/or a second outlet valve d for controlling the opening or closing of an inlet and/or an outlet of the second indoor heat exchanger 9 are/is arranged on the fourth branch; a first heater 12, wherein the first heater 12 can replace the first indoor heat exchanger 8 to provide heat for the indoor space; and/or a second heater 13, wherein the second heater 13 can replace the second indoor heat exchanger 9 to provide heat for the indoor.
A first pressure sensor 2 for detecting the pressure of the exhaust port of the compressor 1 is arranged on the first branch; and/or a second pressure sensor 14 for detecting the pressure of the air inlet of the compressor 1 is arranged on the sixth branch. The first branch is provided with a one-way valve 3. A shock absorbing hose 16 is arranged between the air inlet of the compressor 1 and the vapor-liquid separation device. The utility model discloses a first pressure sensor 2, second pressure sensor 14 can be used to detect the gas vent of compressor 1 and the pressure of air inlet. The utility model discloses a first pressure sensor 2 can be high pressure sensor, and second pressure sensor 14 can be low pressure sensor.
The throttling device 7 is an electronic expansion valve, the outdoor heat exchanger 5 is a condenser, the first indoor heat exchanger 8 is a first evaporator, and the second indoor heat exchanger 9 is a second evaporator. The outdoor heat exchanger 5 is also provided with an outdoor heat exchanger fan 6, and heat exchange is accelerated by the fan.
Heat pump air conditioning system is used for rail vehicle, indoor indicating in the carriage, outdoor being outside the carriage, first indoor heat exchanger 8, the indoor heat exchanger 9 of second are located the both sides of vehicle, and the in-car air outlet is located the intermediate position of vehicle.
As shown in fig. 2 and 3, in addition, the present invention also provides a control method for a heat pump air conditioning system, the air conditioning system is any one of the air conditioning system described in the present invention, the control method comprises switching over by controlling the four-way valve, the first inlet valve a, the first outlet valve b, the second inlet valve c, the second outlet valve d, the first evaporation fan 10, the second evaporation fan 11, the first heater 12, and the second heater 13, so that the air conditioning system is switched between the heating operation mode and the defrosting operation mode.
As shown in fig. 2: the heating operation mode specifically comprises the following steps: the first inlet valve a, the first outlet valve b, the second inlet valve c, the second outlet valve d, the first evaporation fan 10 and the second evaporation fan 11 are controlled to be in an open state, and the first heater 12 and the second heater 13 are controlled to be in a closed state.
When the air conditioner runs in a heating mode, the four-way reversing valve 4 is electrified, high-temperature and high-pressure gas discharged from the compressor 1 flows to the first evaporator and the second evaporator through the port E of the four-way reversing valve 4, the first inlet valve a, the first outlet valve b, the second inlet valve c and the second outlet valve d are all in an open state, and the first evaporator and the second evaporator participate in heat exchange;
the air in the vehicle is sent to the first evaporator and the second evaporator through the first evaporation fan 10 and the second evaporation fan 11 for heat exchange and temperature rise, and then is sent back to the vehicle from the middle air outlet duct to form air circulation in the vehicle;
the high-temperature and high-pressure gas entering the first evaporator and the second evaporator is cooled by air in the vehicle to become supercooled liquid, and then is throttled and depressurized through the electronic expansion valve;
the two-phase fluid after throttling and pressure reduction enters a condenser, is subjected to heat absorption and vaporization by a condensing fan and enters a gas-liquid separator from a port C of a four-way reversing valve 4;
the gas separated by the gas-liquid separator enters the suction cavity of the compressor 1 through the shock absorbing hose 16, the low-pressure overheated gas is compressed into high-temperature high-pressure gas again through the compressor 1, and a heating cycle is completed.
In the heating process, because the condenser is an outdoor unit, the condenser is easy to frost in a low-temperature environment, the heat exchange capacity of the outdoor unit is rapidly reduced, the system judges whether defrosting is performed according to the pressure and the ambient temperature of the outdoor unit, when the conditions are met, the system performs a defrosting mode,
as shown in fig. 3, the defrosting operation mode of the present invention is illustrated: the solenoid valves of the first inlet valve aa and the first outlet valve b are closed, the solenoid valves of the second inlet valve c and the second outlet valve d are kept in an open state, and the four-way reversing valve 4 is powered off.
High-temperature and high-pressure gas discharged from the compressor 1 flows to a condenser through a port C of the four-way reversing valve 4, so that a frost layer starts to absorb heat and melt;
cooling and condensing the high-temperature high-pressure gas, and then entering an electronic expansion valve for throttling and depressurizing;
the two-phase fluid after throttling and pressure reduction enters a second evaporator, and the second evaporation fan 11 is in a closed state and a second electric heater is closed because the interior of the evaporator is low-temperature and low-pressure fluid;
at the moment, the first evaporation fan 10 and the first electric heater are still in an opening state and convey hot air to the interior of the vehicle, and the first evaporator does not work, so that all the heat comes from the first electric heater;
the two-phase fluid absorbs heat and is vaporized through the second evaporator and enters the gas-liquid separator through the E pipe of the four-way reversing valve 4;
the gas separated by the gas-liquid separator enters the suction cavity of the compressor 1 through the shock absorption hose 16, the low-pressure overheated gas is compressed into high-temperature high-pressure gas again through the compressor 1, and a defrosting cycle is completed.
The defrosting process system detects the temperature and the high pressure of the outdoor unit in real time, defrosting of the outdoor unit is more sufficient by prolonging defrosting time, and when the condition is met, the system exits defrosting and enters a heating mode again.
The utility model discloses four-way reversing valve 4' S C mouth is first port, and D mouth is the second port, and the E mouth is the third port, and the S mouth is the fourth port.
The utility model discloses a first import valve an, first outlet valve b, second import valve c, second outlet valve d, also can be called import valve a, outlet valve b, import valve c, outlet valve d, above-mentioned valve can be the solenoid valve.
Has the advantages that:
the utility model provides a heat pump air conditioning system and control method thereof, the utility model discloses an air conditioning system when heating operation, in order to prevent 5 frostings of outdoor heat exchanger, the switching-over through the cross valve makes heat pump system realize the defrosting operation. When in defrosting operation, in order to ensure the indoor comfort, the indoor heat supply is ensured by increasing the electric heater. The utility model discloses an air conditioning system changes the frost process in heating, through the switch of controlling first, second evaporimeter, first, second electric heater and first, second evaporation fan 11, has reduced because of the heating process changes the fluctuation that the frost leads to the room temperature that appears, can prolong simultaneously and change the frost time, makes the off-premises station defrosting more complete, has avoided entering again and has heated the mode after influencing the heat transfer effect because of the off-premises station frosting, improves the operating efficiency that heats. Therefore, the falling range of the room temperature in the heating defrosting process is reduced, the outdoor unit is defrosted cleanly and reliably, and the heating operation efficiency is improved.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (7)
1. A heat pump air conditioning system comprises a compressor (1), an outdoor heat exchanger (5), a first indoor heat exchanger (8), a second indoor heat exchanger (9) and a four-way reversing valve (4); the method is characterized in that:
a first branch is arranged between the exhaust port of the compressor (1) and the second port of the four-way reversing valve (4); a sixth branch is arranged between the fourth port of the four-way reversing valve (4) and the air inlet of the compressor (1);
one end of the second branch is communicated with a third port of the four-way reversing valve (4), one end of the fifth branch is communicated with a first port of the four-way reversing valve (4), and a third branch and a fourth branch are connected in parallel between the other end of the second branch and the other end of the fifth branch;
an outdoor heat exchanger (5) and a throttling device (7) are arranged on the fifth branch;
the third branch is provided with a first indoor heat exchanger (8), and the third branch is provided with a first inlet valve and/or a first outlet valve which control the opening or closing of an inlet and/or an outlet of the first indoor heat exchanger (8);
a second indoor heat exchanger (9) is arranged on the fourth branch, and a second inlet valve and/or a second outlet valve for controlling the opening or closing of an inlet and/or an outlet of the second indoor heat exchanger (9) are/is arranged on the fourth branch;
the first heater (12), the first heater (12) can replace the first indoor heat exchanger (8) to provide heat for the room; and/or a second heater (13), wherein the second heater (13) can replace the second indoor heat exchanger (9) to provide heat for the indoor.
2. The air conditioning system of claim 1, wherein: a first pressure sensor (2) for detecting the pressure of the exhaust port of the compressor (1) is arranged on the first branch; and/or a second pressure sensor (14) for detecting the pressure of the air inlet of the compressor (1) is arranged on the sixth branch.
3. The air conditioning system of claim 2, wherein: the first branch is provided with a one-way valve (3).
4. An air conditioning system according to any one of claims 1 to 3, wherein: a gas-liquid separation device (15) is arranged on the sixth branch, and a shock absorption hose (16) is arranged between the gas inlet of the compressor (1) and the gas-liquid separation device (15).
5. An air conditioning system according to any one of claims 1 to 3, wherein: the throttling device (7) is an electronic expansion valve, the outdoor heat exchanger (5) is a condenser, the first indoor heat exchanger (8) is a first evaporator, and the second indoor heat exchanger (9) is a second evaporator.
6. An air conditioning system according to any one of claims 1 to 3, wherein: the air conditioning system is used for the railway vehicle, the indoor air conditioning system is in a carriage, the outdoor air conditioning system is outside the carriage, the first indoor heat exchanger (8) and the second indoor heat exchanger (9) are located on two sides of the vehicle, and the air outlet in the vehicle is located in the middle of the vehicle.
7. An air conditioning system according to any one of claims 1 to 3, wherein: the first heater (12) is disposed adjacent to the first indoor heat exchanger (8) such that an air flow, which may be generated by a first evaporation fan (10) of the first indoor heat exchanger (8), is blown toward the first heater (12), thereby generating hot air to be supplied into the room: and/or, the second heater (13) is arranged adjacent to the second indoor heat exchanger (9), so that the airflow generated by the second evaporation fan (11) can be blown to the second heater (13), thereby generating hot air supplied to the indoor space.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922201383.XU CN211575632U (en) | 2019-12-10 | 2019-12-10 | Heat pump air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922201383.XU CN211575632U (en) | 2019-12-10 | 2019-12-10 | Heat pump air conditioning system |
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| CN211575632U true CN211575632U (en) | 2020-09-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111076459A (en) * | 2019-12-10 | 2020-04-28 | 珠海格力电器股份有限公司 | Heat pump air conditioning system and control method thereof |
| WO2022134530A1 (en) * | 2020-12-25 | 2022-06-30 | 青岛海尔空调器有限总公司 | Control method and device for dual-evaporator air conditioner and dual-evaporator air conditioner |
| CN115419965A (en) * | 2022-09-14 | 2022-12-02 | 珠海格力电器股份有限公司 | Air conditioner and control method and device thereof |
-
2019
- 2019-12-10 CN CN201922201383.XU patent/CN211575632U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111076459A (en) * | 2019-12-10 | 2020-04-28 | 珠海格力电器股份有限公司 | Heat pump air conditioning system and control method thereof |
| WO2022134530A1 (en) * | 2020-12-25 | 2022-06-30 | 青岛海尔空调器有限总公司 | Control method and device for dual-evaporator air conditioner and dual-evaporator air conditioner |
| CN115419965A (en) * | 2022-09-14 | 2022-12-02 | 珠海格力电器股份有限公司 | Air conditioner and control method and device thereof |
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