CN111076446A - Heat pump air conditioning system and control method thereof - Google Patents
Heat pump air conditioning system and control method thereof Download PDFInfo
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- CN111076446A CN111076446A CN201911216278.1A CN201911216278A CN111076446A CN 111076446 A CN111076446 A CN 111076446A CN 201911216278 A CN201911216278 A CN 201911216278A CN 111076446 A CN111076446 A CN 111076446A
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- heat exchanger
- defrosting
- conditioning system
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
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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
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides a heat pump air conditioning system and a control method thereof. The heat pump air-conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device, an outdoor heat exchanger and a second throttling device, wherein the outdoor heat exchanger comprises a main heat exchanger and a defrosting heat exchanger, the defrosting heat exchanger is positioned on the upstream side of the air flow of the main heat exchanger, the second throttling device is connected with the defrosting heat exchanger in series to form a defrosting pipeline, when the heat pump air-conditioning system is in a heating working condition, a refrigerant is divided into two paths from an exhaust port of the compressor after passing through the indoor heat exchanger and the first throttling device, one path of refrigerant flows back to the compressor through the main heat exchanger, and the other path of refrigerant enters the defrosting heat exchanger after being throttled by. According to the heat pump air-conditioning system, the frosting frequency of the main outdoor heat exchanger in the heat pump air-conditioning system can be reduced, so that the heat pump air-conditioning system can be in a normal heating working condition for a long time, and the working energy efficiency of the heat pump air-conditioning system is improved.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to a heat pump air conditioning system and a control method thereof.
Background
When the heat pump air conditioner is used under a low-temperature working condition, after the heat pump air conditioner operates for a period of time, the heat exchanger of the outer unit frosts, heat resistance and wind resistance are increased, heat exchange is not facilitated, performance of the air conditioner is poor, and in order to enable the air conditioner to operate normally, the air conditioner needs to be defrosted. The main defrosting mode of the existing air conditioner is to switch a four-way valve and change the direction of the four-way valve, in the defrosting process, an indoor fan is stopped, heat cannot be provided for the indoor, meanwhile, because the temperature of a refrigerant flowing through an indoor heat exchanger is low, heat can be absorbed from the indoor, the room temperature is reduced, and meanwhile, the comfort of the room is also reduced.
The air conditioning system adopts two outdoor heat exchangers, when the air conditioner is in a heating state, the two outdoor heat exchangers absorb heat at the same time, the heating quantity is improved, when the air conditioner is in a defrosting state, the indoor heat exchanger and one of the outdoor heat exchangers are in a condensation heat release state, the outdoor heat exchanger is used for heating air, the heated air is used for defrosting the other outdoor heat exchanger, and uninterrupted heating of the air conditioning system is realized.
However, for the air conditioning system, because the two outdoor heat exchangers are both in the evaporation and heat absorption states during heating, the frosting frequencies of the two outdoor heat exchangers are basically the same, and thus, the defrosting control needs to be performed in a short time when the air conditioning system works in the heating working condition, so that the working energy efficiency of the air conditioning system is reduced, the running time of the heating working condition with high energy efficiency is shortened, and the working performance of the air conditioning system is reduced.
Disclosure of Invention
Therefore, an object of the present invention is to provide a heat pump air conditioning system and a control method thereof, which can reduce the frosting frequency of a main outdoor heat exchanger in the heat pump air conditioning system, so that the heat pump air conditioning system can be in a normal heating condition for a long time, and improve the working energy efficiency of the heat pump air conditioning system.
In order to solve the above problems, the present application provides a heat pump air conditioning system including a compressor, a four-way valve, an indoor heat exchanger, a first throttle device, an outdoor heat exchanger, and a second throttle device, the first throttle device being located on a pipe between the indoor heat exchanger and the outdoor heat exchanger, the outdoor heat exchanger including a main heat exchanger and a defrosting heat exchanger, the defrosting heat exchanger being located on an air flow upstream side of the main heat exchanger, the second throttle device being connected in series with the defrosting heat exchanger to form a defrosting pipe, the defrosting pipe being selectively connectable in parallel with the indoor heat exchanger or the main heat exchanger, when the heat pump air-conditioning system is in a heating working condition, the refrigerant is divided into two paths after passing through the indoor heat exchanger and the first throttling device from the exhaust port of the compressor, one path of the air flows back to the compressor through the main heat exchanger, and the other path of the air flows into the defrosting heat exchanger after being throttled by the second throttling device and then flows back to the compressor.
Preferably, the indoor heat exchanger is provided with electric auxiliary heat; and/or an inner fan is arranged at the indoor heat exchanger.
Preferably, the exhaust port of the compressor is connected with a four-way valve, and a bypass line is further provided at the exhaust port of the compressor, and the defrosting line can be selectively communicated with the four-way valve or the bypass line.
Preferably, the heat pump air conditioning system further comprises a three-way valve, and the defrosting pipeline, the bypass pipeline and the four-way valve are all connected to the three-way valve; or, two-way valves are arranged on a connecting pipeline between the defrosting pipeline and the four-way valve and a bypass pipeline.
According to another aspect of the present application, there is provided a control method of the heat pump air conditioning system, including:
acquiring the operation condition of a heat pump air conditioning system;
when the heat pump air-conditioning system is in a heating working condition, the refrigerant is controlled to be divided into two paths from an exhaust port of the compressor through the indoor heat exchanger and the first throttling device, wherein one path flows back to the compressor through the main heat exchanger, and the other path flows into the defrosting heat exchanger after being throttled by the second throttling device and then flows back to the compressor.
Preferably, the control method further includes:
when the heat pump air-conditioning system is in a defrosting condition, acquiring frosting conditions of the main heat exchanger and the defrosting heat exchanger;
and adjusting the communication condition of the defrosting pipeline according to the frosting conditions of the main heat exchanger and the defrosting heat exchanger.
Preferably, the step of adjusting the communication condition of the defrost line according to the frosting conditions of the main heat exchanger and the defrost heat exchanger includes:
when the main heat exchanger is not frosted and the defrosting heat exchanger is frosted, the defrosting pipeline is controlled to be disconnected with the four-way valve and communicated with the bypass pipeline;
the refrigerant is controlled to flow out of the compressor and then is divided into two paths, wherein one path of the refrigerant enters the main heat exchanger after passing through the indoor heat exchanger and the first throttling device and then flows back to the compressor;
and the other path of the refrigerant flows through a bypass pipeline, the defrosting heat exchanger and a second throttling device, then enters the main heat exchanger, and then flows back to the compressor.
Preferably, the step of adjusting the communication condition of the defrost line according to the frosting conditions of the main heat exchanger and the defrost heat exchanger includes:
when the main heat exchanger and the defrosting heat exchanger are frosted, the defrosting pipeline is controlled to be communicated with the four-way valve and disconnected with the bypass pipeline;
controlling the first throttling device and the second throttling device to be at the maximum opening degree;
and the control refrigerant flows out of the compressor, enters the indoor heat exchanger through the four-way valve and then is divided into two paths, wherein one path flows back to the compressor through the defrosting heat exchanger, and the other path flows back to the compressor through the main heat exchanger.
Preferably, the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger and the defrosting heat exchanger further comprises:
turning on the electric auxiliary heater;
detecting the tube temperature of the indoor heat exchanger;
when the pipe temperature of the indoor heat exchanger is greater than T, controlling the opening of the inner fan;
and when the pipe temperature of the indoor heat exchanger is less than or equal to T, controlling the inner fan to be closed.
Preferably, the step of adjusting the communication condition of the defrost line according to the frosting conditions of the main heat exchanger and the defrost heat exchanger includes:
when the main heat exchanger and the defrosting heat exchanger are frosted, the defrosting pipeline is controlled to be communicated with the four-way valve and disconnected with the bypass pipeline;
controlling a four-way valve to switch a defrosting mode;
and the control refrigerant flows out of the compressor and then is divided into two paths through the four-way valve, wherein one path of the refrigerant flows through the defrosting heat exchanger and the second throttling device, the other path of the refrigerant flows through the main heat exchanger, the two paths of the refrigerant converge and then are throttled by the first throttling device, enter the indoor heat exchanger for heat exchange, and then flow back to the compressor through the four-way valve.
The application provides a heat pump air-conditioning system, including the compressor, the cross valve, indoor heat exchanger, first throttling arrangement, outdoor heat exchanger and second throttling arrangement, first throttling arrangement is located the pipeline between indoor heat exchanger and the outdoor heat exchanger, outdoor heat exchanger includes main heat exchanger and defrosting heat exchanger, the defrosting heat exchanger is located the air flow upstream side of main heat exchanger, second throttling arrangement and defrosting heat exchanger series connection form the defrosting pipeline, the defrosting pipeline can selectively connect in parallel with indoor heat exchanger or connect in parallel with main heat exchanger, when heat pump air-conditioning system is in the working condition of heating, the refrigerant divides into two routes behind indoor heat exchanger and first throttling arrangement from the gas vent of compressor, wherein one route flows back to the compressor through main heat exchanger, another route gets into the defrosting heat exchanger after second throttling arrangement throttle, then flows back to the compressor. When the heat pump air-conditioning system is in a heating working condition, the main heat exchanger and the defrosting heat exchanger are in an evaporation heat absorption mode, the refrigerant flows through the second throttling device for throttling and then enters the defrosting heat exchanger for absorbing heat, so that the temperature of the refrigerant in the defrosting heat exchanger is lower, the surface temperature of the defrosting heat exchanger is lower, the air flows through the defrosting heat exchanger firstly in the heat exchange process with the outdoor heat exchanger, the air can be dehumidified by the defrosting heat exchanger, the air flowing through the main heat exchanger after the heat exchange of the defrosting heat exchanger is drier, a frost layer is mainly distributed on the defrosting heat exchanger, the defrosting period of the main heat exchanger is prolonged, the frost condensation or icing of the main heat exchanger is effectively avoided, and the main heat exchanger provides main heat exchange for the operation of the heat pump air-conditioning system, so the frosting period of the main heat exchanger is effectively, the frosting speed of the main heat exchanger is reduced, the frosting frequency of the main outdoor heat exchanger in the heat pump air-conditioning system can be reduced, the heat pump air-conditioning system can be in a normal heating working condition for a long time, and the working energy efficiency of the heat pump air-conditioning system is improved.
Drawings
Fig. 1 is a heating system cycle diagram of a heat pump air conditioning system according to a first embodiment of the present application;
FIG. 2 is a cycle diagram of a bypass and bypass defrost system for a heat pump air conditioning system according to a first embodiment of the present application;
fig. 3 is a cycle diagram of a hot gas non-diversion defrosting system of a heat pump air conditioning system according to a first embodiment of the present application;
fig. 4 is a system cycle diagram of a four-way valve reversing defrosting mode of the heat pump air conditioning system according to the first embodiment of the present application;
fig. 5 is a heating system cycle diagram of a heat pump air conditioning system according to a second embodiment of the present application;
FIG. 6 is a cycle diagram of a bypass and bypass defrost system for a heat pump air conditioning system according to a second embodiment of the present application;
fig. 7 is a cycle diagram of a hot gas non-diversion defrosting system of a heat pump air conditioning system according to a second embodiment of the present application;
fig. 8 is a system cycle diagram of a four-way valve reversing defrosting mode of a heat pump air conditioning system according to a second embodiment of the present application;
fig. 9 is a control flowchart of the heat pump air conditioning system according to the embodiment of the present application.
The reference numerals are represented as:
1. a compressor; 2. a four-way valve; 3. an indoor heat exchanger; 4. a first throttling device; 5. a second throttling device; 6. a primary heat exchanger; 7. a defrosting heat exchanger; 8. electrically assisting in heating; 9. a bypass line; 10. a three-way valve; 11. a two-way valve.
Detailed Description
Referring to fig. 1 to 8 in combination, according to an embodiment of the present application, a heat pump air conditioning system includes a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a first throttling device 4, an outdoor heat exchanger and a second throttling device 5, the first throttling device 4 is located on a pipeline between the indoor heat exchanger 3 and the outdoor heat exchanger, the outdoor heat exchanger includes a main heat exchanger 6 and a defrosting heat exchanger 7, the defrosting heat exchanger 7 is located on an upstream side of an air flow of the main heat exchanger 6, the second throttling device 5 is connected in series with the defrosting heat exchanger 7 to form a defrosting pipeline, the defrosting pipeline can be selectively connected in parallel with the indoor heat exchanger 3 or the main heat exchanger 6, when the heat pump air conditioning system is in a heating working condition, a refrigerant is divided into two paths from an exhaust port of the compressor 1 through the indoor heat exchanger 3 and the first throttling device 4, one path flows back to the compressor 1 through the main heat exchanger 6, and the other path enters the defrosting heat exchanger, and then flows back to the compressor 1.
When the heat pump air-conditioning system is in a heating working condition, the main heat exchanger 6 and the defrosting heat exchanger 7 are in an evaporation heat absorption mode, the refrigerant firstly flows through the first throttling device 4 and the second throttling device 5 for two times and then enters the defrosting heat exchanger 7 for absorbing heat, so that the temperature of the refrigerant in the defrosting heat exchanger 7 is lower, the surface temperature of the defrosting heat exchanger 7 is lower, the air firstly flows through the defrosting heat exchanger 7 in the heat exchange process with the outdoor heat exchanger, the air can be dehumidified by the defrosting heat exchanger 7, the air which flows through the main heat exchanger 6 after the heat exchange of the defrosting heat exchanger 7 is drier, a frost layer is mainly distributed on the defrosting heat exchanger 7, the defrosting period of the main heat exchanger 6 is prolonged, the frost condensation or icing of the main heat exchanger 6 is effectively avoided, and the main heat exchanger 6 provides main heat exchange for the operation of the heat pump, therefore, the frosting period of the main heat exchanger 6 is effectively prolonged, the frosting speed of the main heat exchanger 6 is reduced, the frosting frequency of the main outdoor heat exchanger in the heat pump air-conditioning system can be reduced, the heat pump air-conditioning system can be in a normal heating working condition for a long time, and the working energy efficiency of the heat pump air-conditioning system is improved.
The indoor heat exchanger 3 is provided with electric auxiliary heat 8; and/or an inner fan is arranged at the indoor heat exchanger 3.
The four-way valve 2 is connected to the exhaust port of the compressor 1, and the bypass line 9 is further provided to the exhaust port of the compressor 1, and the defrosting line can be selectively communicated with the four-way valve 2 or the bypass line 9. The exhaust port of the compressor 1 can be directly communicated with the defrosting pipeline through the bypass pipeline 9, so that the heat pump air-conditioning system can enable the refrigerant to directly flow through the indoor heat exchanger 3 and the defrosting heat exchanger 7 respectively through the exhaust port of the compressor 1 as required, at the moment, the defrosting heat exchanger 7 and the indoor heat exchanger 3 are connected in parallel and then connected in series with the main heat exchanger 6, and under the condition, the heat pump air-conditioning system is in the bypass shunting defrosting system circulation.
When the first throttling device 4 and the second throttling device 5 are both in the maximum opening degree, the exhaust port of the compressor 1 can also enter the indoor heat exchanger 3 through the four-way valve 2, then flow through the first throttling device 4 and then split, the split refrigerant respectively enters the defrosting heat exchanger 7 and the main heat exchanger 6 to release heat, the defrosting heat exchanger 7 and the main heat exchanger 6 are defrosted, in the whole process, the refrigerant does not absorb heat from the outside, and indoor heating and defrosting of the outdoor heat exchanger are performed by only utilizing the work of the compressor 1 and the heat accumulated before the refrigerant, and under the condition, the heat pump air-conditioning system is in a hot gas non-splitting defrosting system circulation.
When the heat pump air-conditioning system is in a four-way valve reversing defrosting mode system circulation, the four-way valve 2 switches the running state at the moment, so that the heat pump air-conditioning system enters a refrigeration mode, a refrigerant flows out of the compressor 1 and then enters the four-way valve, then flows out of the four-way valve, flows through the defrosting heat exchanger 7 and the main heat exchanger 6 to release heat, and simultaneously defrosts the defrosting heat exchanger 7 and the main heat exchanger 6, and after being throttled by the second throttling device 5, the refrigerant flowing out of the defrosting heat exchanger 7 is converged with the refrigerant flowing out of the main heat exchanger 6, then flows into the indoor heat exchanger 3 to absorb heat after being throttled by the first throttling device 4, and finally flows out of the indoor heat exchanger 3 and flows back. In this process, in order to guarantee the comfort level of indoor temperature, need open electric auxiliary heating 8, close interior fan simultaneously, avoid indoor heat exchanger 3's heat absorption to cause too big influence to indoor temperature, guarantee that indoor temperature keeps at suitable temperature in the defrosting stage.
The heat pump air-conditioning system also comprises a three-way valve 10, and the defrosting pipeline, the bypass pipeline 9 and the four-way valve 2 are all connected to the three-way valve 10; or, a two-way valve 11 is arranged on a connecting pipeline between the defrosting pipeline and the four-way valve 2 and on the bypass pipeline 9.
Referring to fig. 1 to 4 and 9 in combination, according to a first embodiment of the present application, the control method of the heat pump air conditioning system includes: acquiring the operation condition of a heat pump air conditioning system; when the heat pump air-conditioning system is in a heating working condition, the refrigerant is controlled to be divided into two paths from an exhaust port of the compressor 1 through the indoor heat exchanger 3 and the first throttling device 4, wherein one path flows back to the compressor 1 through the main heat exchanger 6, and the other path flows into the defrosting heat exchanger 7 after being throttled by the second throttling device 5 and then flows back to the compressor 1.
During the heating period of the heat pump air-conditioning system, a refrigerant enters the indoor heat exchanger 3 after coming out of an exhaust port of the compressor 1, and enters the first throttling device 4 after passing through the indoor heat exchanger 3, a part of the throttled low-temperature and low-pressure refrigerant enters the main heat exchanger 6 to exchange heat with outside air, the other part of the throttled low-temperature and low-pressure refrigerant passes through the second throttling device 5, the refrigerant enters the defrosting heat exchanger 7 after secondary throttling to exchange heat with the outside air, the refrigerant coming out of the main heat exchanger 6 and the defrosting heat exchanger 7 is converged and then returns to an air suction port of the compressor 1 through the four-way valve. Since the refrigerant entering the defrosting heat exchanger 7 is throttled twice by the first and second throttling devices 4 and 5, the temperature of the refrigerant entering the defrosting heat exchanger 7 becomes lower, so that the air can be dehumidified, and the air passing through the main heat exchanger 6 is drier, so that the frost layer is mainly distributed on the defrosting heat exchanger 7, and the main heat exchanger 6 has almost no frost layer.
The control method further comprises the following steps: when the heat pump air-conditioning system is in a defrosting condition, acquiring the frosting conditions of the main heat exchanger 6 and the defrosting heat exchanger 7; and adjusting the communication condition of the defrosting pipeline according to the frosting conditions of the main heat exchanger 6 and the defrosting heat exchanger 7.
The step of adjusting the communication condition of the defrosting pipeline according to the frosting condition of the main heat exchanger 6 and the defrosting heat exchanger 7 comprises the following steps: when the main heat exchanger 6 is not frosted and the defrosting heat exchanger 7 is frosted, the defrosting pipeline is controlled to be disconnected with the four-way valve 2 and communicated with the bypass pipeline 9; the refrigerant is controlled to flow out of the compressor 1 and then divided into two paths, wherein one path of the refrigerant enters the main heat exchanger 6 after passing through the indoor heat exchanger 3 and the first throttling device 4 and then flows back to the compressor 1; the other path enters the main heat exchanger 6 through a bypass pipeline 9, the defrosting heat exchanger 7 and the second throttling device 5 and then flows back to the compressor 1.
The step of adjusting the communication condition of the defrosting pipeline according to the frosting condition of the main heat exchanger 6 and the defrosting heat exchanger 7 comprises the following steps: when the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, the defrosting pipeline is controlled to be communicated with the four-way valve 2 and disconnected with the bypass pipeline 9; controlling the first throttling device 4 and the second throttling device 5 to be at the maximum opening degree; the control refrigerant flows out of the compressor 1, then enters the indoor heat exchanger 3 through the four-way valve 2, and then is divided into two paths, wherein one path flows back to the compressor 1 through the defrosting heat exchanger 7, and the other path flows back to the compressor 1 through the main heat exchanger 6.
The step of adjusting the communication condition of the defrosting pipeline according to the frosting condition of the main heat exchanger 6 and the defrosting heat exchanger 7 further comprises the following steps: turning on the electric auxiliary heater 8; detecting the tube temperature of the indoor heat exchanger 3; when the pipe temperature of the indoor heat exchanger 3 is greater than T, controlling the opening of the inner fan; and when the pipe temperature of the indoor heat exchanger 3 is less than or equal to T, controlling the inner fan to be closed.
The step of adjusting the communication condition of the defrosting pipeline according to the frosting condition of the main heat exchanger 6 and the defrosting heat exchanger 7 comprises the following steps: when the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, the defrosting pipeline is controlled to be communicated with the four-way valve 2 and disconnected with the bypass pipeline 9; controlling the four-way valve 2 to switch the defrosting mode; the control refrigerant is divided into two paths through the four-way valve 2 after flowing out of the compressor 1, wherein one path flows through the defrosting heat exchanger 7 and the second throttling device 5, the other path flows through the main heat exchanger 6, the two paths of refrigerants converge and then are throttled by the first throttling device 4, enter the indoor heat exchanger 3 for heat exchange, and then flow back to the compressor 1 through the four-way valve 2.
In the application, the heat pump air conditioning system has three defrosting modes, namely bypass flow diversion defrosting, hot air defrosting and four-way valve reversing defrosting, and the implementation operation of the three defrosting modes is judged through the pipe temperature of the outdoor heat exchanger.
When the main heat exchanger 6 does not frost and frost layers are only distributed on the defrosting heat exchanger 7, a bypass flow dividing defrosting mode is adopted, the compressor 1 continuously operates during defrosting, the four-way valve 2 does not change direction, a refrigerant is divided into two paths after coming out of an exhaust port of the compressor 1, and one path passes through the indoor heat exchanger 3 and the first throttling device 4; the other path passes through the three-way valve 10, the defrosting heat exchanger 7 and the second throttling device 5, then passes through the main heat exchanger 6, is converged with the refrigerant flowing out of the indoor heat exchanger 3, then passes through the main heat exchanger 6 and the four-way valve 2 and returns to the suction port of the compressor 1, and thus one circulation of the refrigerant during defrosting is completed. Meanwhile, during defrosting, one path of refrigerant from the compressor 1 passes through the indoor heat exchanger 3 to continuously supply heat to the indoor, and meanwhile, the internal electromechanical auxiliary heat 8 is started to increase the indoor heat supply; the other path is used for defrosting the outer unit through the three-way valve 10 to the defrosting heat exchanger 7, the system controls the rotation or stop of the inner fan and the outer fan according to the frosting condition of the outer unit during defrosting, continuous heat supply to the indoor space is realized while the outer unit is defrosted, and indoor comfort during defrosting is improved.
The main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, when the main heat exchanger 6 is frosted slightly, a hot defrosting mode is adopted, the compressor 1 is continuously operated during defrosting, the four-way valve 2 is not reversed, the refrigerant is not shunted after coming out of an exhaust port of the compressor 1, the refrigerant continuously supplies heat to the indoor through the indoor heat exchanger 3, and meanwhile, the internal electromechanical auxiliary heat is started, so that the indoor heat supply amount is increased; the refrigerant enters the first throttling device 4 after passing through the indoor heat exchanger 3, at the moment, the throttling function of the throttling device is weakened, the refrigerant is divided into two parts after coming out of the first throttling device 4, one part of the refrigerant directly enters the main heat exchanger 6 for defrosting, the other part of the refrigerant enters the defrosting heat exchanger 7 for defrosting through the second throttling device 5, the refrigerant coming out of the main heat exchanger 6 and the defrosting heat exchanger 7 is converged and then returns to the suction port of the compressor 1 through the four-way valve 2, and one cycle of the refrigerant is completed.
During this period, in order to guarantee indoor temperature's stability and travelling comfort, can utilize electricity to assist heat 8 for indoor heat supply, utilize interior fan to regulate and control indoor temperature simultaneously. During defrosting by using the mode, the indoor heat exchanger 3, the main heat exchanger 6 and the defrosting heat exchanger 7 all release heat outwards, and defrosting heat of the main heat exchanger 6 and the defrosting heat exchanger 7 needs to be provided at the same time, so that heat which can be supplied to the indoor heat exchanger 3 is unstable, and fluctuation of indoor temperature is easily caused due to the influence of electric auxiliary heat, therefore, in the process, the indoor temperature needs to be regulated and controlled by the inner fan, and fluctuation of the indoor temperature in the defrosting process of the outdoor heat exchanger is reduced. Specifically, in the application, the temperature of the electric auxiliary heater 8 can be constant, the pipe temperature of the indoor heat exchanger 3 can be detected at the moment, when the pipe temperature of the indoor heat exchanger 3 is greater than T, the inner fan is controlled to be started, and the fan can be used for diffusing the heat at the indoor heat exchanger 3 at the moment, so that the indoor temperature is diffused, and the problem that the indoor temperature is uneven due to overhigh local temperature of the indoor heat exchanger 3 is solved; when the pipe temperature of indoor heat exchanger 3 is less than or equal to T, then control interior fan and close, avoid the air diffusion of the lower temperature that indoor heat exchanger 3 department gived off to other places indoor, cause the problem that the temperature of other places indoor is less than the settlement temperature, improve the travelling comfort of indoor temperature, and then indoor heat exchanger 3 causes the undulant too big problem of indoor temperature when also effectively having avoided the steam defrosting mode, improve the comfort level that heat pump air conditioning system used.
The defrosting method is characterized in that the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, when the frost layer of the main heat exchanger 6 is thick, a four-way valve reversing defrosting mode is adopted, the compressor 1 is stopped during defrosting, the four-way valve 2 is reversed, after a refrigerant comes out from an exhaust port of the compressor 1, the refrigerant respectively enters the main heat exchanger 6 and the defrosting heat exchanger 7 through the four-way valve 2 to be defrosted, and after the refrigerant comes out, the refrigerant finally returns to the compressor 1 through the first throttling device 4, the indoor heat exchanger 3 and the four-way valve 2 to complete one cycle of. In this process, the second throttling device 5 may be in a fully open state, so as to avoid throttling the refrigerant flowing out of the defrosting heat exchanger 7, thereby reducing the heat absorption capacity of the refrigerant in the room and improving the comfort level of the indoor temperature. In order to ensure the stable comfort of the indoor temperature, the electric auxiliary heater 8 can be turned on during defrosting to perform auxiliary heating indoors, meanwhile, the heat required by outdoor defrosting is provided by the electric auxiliary heater, and the influence on the indoor environment temperature is reduced. In order to further reduce the influence on the indoor environment temperature in the process, the inner fan can be also closed, so that the heat absorption temperature mainly comes from the electric auxiliary heat 8, the influence of the heat absorption temperature on the indoor air temperature on the peripheral side of the indoor heat exchanger 3 is reduced, and the comfort of the indoor temperature is ensured.
Referring to fig. 5 to 8 in combination, the second embodiment of the present application is substantially the same as the first embodiment in terms of its basic structure and control method, except that in this embodiment, two-way valves 11 are used instead of the three-way valve 10.
In the above embodiments of the present application, the forms of the first throttling means 4 and the second throttling means 5 are not limited, and may be capillary throttling, short throttling, electronic expansion valve throttling, etc., and the first throttling means 4 and the second throttling means 5 may be combined using different throttling means, or may be the same throttling means.
Preferably, the first throttling device 4 and the second throttling device 5 in the present application are both throttling devices with adjustable opening degrees, such as electronic expansion valves, so as to facilitate selection of a control mode more suitable for operation of the heat pump air conditioning system through opening degree adjustment.
The form of outdoor heat exchanger in this application scheme is not restricted, can be tube fin heat exchanger, also can be microchannel heat exchanger etc. specifically selects according to the in service behavior.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (10)
1. The heat pump air-conditioning system is characterized by comprising a compressor (1), a four-way valve (2), an indoor heat exchanger (3), a first throttling device (4), an outdoor heat exchanger and a second throttling device (5), wherein the first throttling device (4) is positioned on a pipeline between the indoor heat exchanger (3) and the outdoor heat exchanger, the outdoor heat exchanger comprises a main heat exchanger (6) and a defrosting heat exchanger (7), the defrosting heat exchanger (7) is positioned on the upstream side of the air flowing of the main heat exchanger (6), the second throttling device (5) is connected with the defrosting heat exchanger (7) in series to form a defrosting pipeline, the defrosting pipeline can be selectively connected with the indoor heat exchanger (3) in parallel or connected with the main heat exchanger (6) in parallel, and when the heat pump air-conditioning system is in a heating working condition, a refrigerant passes through an exhaust port of the compressor (1) through the indoor heat exchanger (3) and the first throttling device (4) and then is divided into two parts And one path of the heat exchange fluid flows back to the compressor (1) through the main heat exchanger (6), and the other path of the heat exchange fluid flows back to the compressor (1) after being throttled by the second throttling device (5) and enters the defrosting heat exchanger (7).
2. Heat pump air conditioning system according to claim 1, characterized in that an electric auxiliary heat (8) is provided at the indoor heat exchanger (3); and/or an inner fan is arranged at the indoor heat exchanger (3).
3. The heat pump air conditioning system according to claim 1, wherein the four-way valve (2) is connected to an exhaust port of the compressor (1), and a bypass line (9) is further provided to the exhaust port of the compressor (1), and the defrost line is selectively communicated with the four-way valve (2) or the bypass line (9).
4. A heat pump air conditioning system according to claim 3, further comprising a three-way valve (10), the defrost line, the bypass line (9) and the four-way valve (2) all being connected to the three-way valve (10); or a two-way valve (11) is arranged on a connecting pipeline between the defrosting pipeline and the four-way valve (2) and on the bypass pipeline (9).
5. A control method of a heat pump air conditioning system according to any one of claims 1 to 4, characterized by comprising:
acquiring the operation condition of a heat pump air conditioning system;
when the heat pump air-conditioning system is in a heating working condition, the refrigerant is controlled to be divided into two paths from an exhaust port of the compressor (1) through the indoor heat exchanger (3) and the first throttling device (4), wherein one path flows back to the compressor (1) through the main heat exchanger (6), and the other path flows into the defrosting heat exchanger (7) after being throttled by the second throttling device (5) and then flows back to the compressor (1).
6. The control method of a heat pump air conditioning system according to claim 5, characterized by further comprising:
when the heat pump air-conditioning system is in a defrosting condition, acquiring frosting conditions of the main heat exchanger (6) and the defrosting heat exchanger (7);
and adjusting the communication condition of the defrosting pipeline according to the frosting conditions of the main heat exchanger (6) and the defrosting heat exchanger (7).
7. The control method of the heat pump air conditioning system according to claim 6, wherein the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger (6) and the defrosting heat exchanger (7) comprises:
when the main heat exchanger (6) is not frosted and the defrosting heat exchanger (7) is frosted, the defrosting pipeline is controlled to be disconnected from the four-way valve (2) and communicated with the bypass pipeline (9);
the refrigerant is controlled to flow out of the compressor (1) and then is divided into two paths, wherein one path of the refrigerant enters the main heat exchanger (6) after passing through the indoor heat exchanger (3) and the first throttling device (4) and then flows back to the compressor (1);
the other path enters the main heat exchanger (6) through a bypass pipeline (9), a defrosting heat exchanger (7) and a second throttling device (5) and then flows back to the compressor (1).
8. The control method of the heat pump air conditioning system according to claim 6, wherein the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger (6) and the defrosting heat exchanger (7) comprises:
when the main heat exchanger (6) and the defrosting heat exchanger (7) are frosted, the defrosting pipeline is controlled to be communicated with the four-way valve (2) and disconnected from the bypass pipeline (9);
controlling the first throttling device (4) and the second throttling device (5) to be in the maximum opening degree;
the refrigerant is controlled to flow out of the compressor (1), then enters the indoor heat exchanger (3) through the four-way valve (2), and then is divided into two paths, wherein one path flows back to the compressor (1) through the defrosting heat exchanger (7), and the other path flows back to the compressor (1) through the main heat exchanger (6).
9. The control method of the heat pump air conditioning system according to claim 8, wherein the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger (6) and the defrosting heat exchanger (7) further comprises:
turning on the electric auxiliary heater (8);
detecting the tube temperature of the indoor heat exchanger (3);
when the pipe temperature of the indoor heat exchanger (3) is greater than T, the inner fan is controlled to be started;
and when the pipe temperature of the indoor heat exchanger (3) is less than or equal to T, controlling the inner fan to be closed.
10. The control method of the heat pump air conditioning system according to claim 6, wherein the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger (6) and the defrosting heat exchanger (7) comprises:
when the main heat exchanger (6) and the defrosting heat exchanger (7) are frosted, the defrosting pipeline is controlled to be communicated with the four-way valve (2) and disconnected from the bypass pipeline (9);
controlling a four-way valve (2) to switch a defrosting mode;
the control refrigerant flows out of the compressor (1) and then is divided into two paths through the four-way valve (2), wherein one path flows through the defrosting heat exchanger (7) and the second throttling device (5), the other path flows through the main heat exchanger (6), the two paths of refrigerants converge and then are throttled through the first throttling device (4), enter the indoor heat exchanger (3) for heat exchange, and then flow back to the compressor (1) through the four-way valve (2).
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