CN110103668A - The heat pump air conditioner of automobile - Google Patents

Abstract

The invention discloses a heat pump air conditioner for automobiles, comprising: a compressor, an external heat exchanger, a gas-liquid separator, an evaporator, and an internal heat exchanger. The output of the compressor communicates with the first end of the outer heat exchanger and the second end of the inner heat exchanger, respectively. The first end of the high-temperature and high-pressure flow channel of the gas-liquid separator communicates with the second end of the external heat exchanger, and the second end of the high-temperature and high-pressure flow channel of the gas-liquid separator communicates with the second end of the evaporator. The first end of the low-temperature and low-pressure passage of the gas-liquid separator communicates with the input of the compressor, and the second end of the low-temperature and low-pressure passage of the gas-liquid separator communicates with the first end of the evaporator and the first end of the internal heat exchanger. The first end of the evaporator communicates with the first end of the internal heat exchanger. The first end of the inner heat exchanger communicates with the first end of the outer heat exchanger. Wherein, each component communicates with each other through a pipeline, and an on-off valve is installed on the pipeline to cut off or open the pipeline, and the working medium of the heat pump air conditioner is carbon dioxide.

Description

Car heat pump air conditioner

technical field

The invention relates to auto parts, more specifically, to a heat pump air conditioner for an automobile.

Background technique

In the current automobile air-conditioning system, the refrigerant used is mainly HFC-134a, which has no damage to the ozone layer (ODP=0), but has a rather high global warming potential (GWP=1300). From 2017, new production vehicles in the EU will stop using HFC-134a as a refrigerant for automotive air conditioners. On January 1, 2019, the Kigali Amendment to the Montreal Protocol came into effect. The world is drastically reducing the production and consumption of HFCs, a powerful greenhouse gas, and limiting global warming. China is also planning to join the Kigali Amendment, and it is foreseeable that the use of HFC-134a will be greatly reduced.

In winter, when air conditioner heating is required, PTC heating is generally used. However, PTC heating consumes a lot of battery power. For traditional fuel vehicles, the impact is not very significant because the car engine will charge the battery, but for electric vehicles that use batteries as the only energy source, the use of PTC heating will accelerate the consumption of battery power in the vehicle, and for electric vehicles The cruising range has a great influence. At the same time, in the case of insufficient power, the PTC cannot be turned on, and the comfort of passengers in winter cannot be guaranteed.

Contents of the invention

The invention proposes a heat pump air conditioner for automobiles using carbon dioxide as a working medium.

According to an embodiment of the present invention, a heat pump air conditioner for an automobile is proposed, including: a compressor, an external heat exchanger, a gas-liquid separator, an evaporator, and an internal heat exchanger. The output of the compressor communicates with the first end of the outer heat exchanger and the second end of the inner heat exchanger, respectively. The first end of the high-temperature and high-pressure flow channel of the gas-liquid separator communicates with the second end of the external heat exchanger, and the second end of the high-temperature and high-pressure flow channel of the gas-liquid separator communicates with the second end of the evaporator. The first end of the low-temperature and low-pressure passage of the gas-liquid separator communicates with the input of the compressor, and the second end of the low-temperature and low-pressure passage of the gas-liquid separator communicates with the first end of the evaporator and the first end of the internal heat exchanger. The first end of the evaporator communicates with the first end of the internal heat exchanger. The first end of the inner heat exchanger communicates with the first end of the outer heat exchanger. Wherein, each component communicates with each other through a pipeline, and an on-off valve is installed on the pipeline to cut off or open the pipeline, and the working medium of the heat pump air conditioner is carbon dioxide.

In one embodiment, the heat pump air conditioner further includes an in-vehicle equipment heat exchanger, the first end of the in-vehicle equipment heat exchanger communicates with the second end of the low-temperature and low-pressure flow path of the gas-liquid separator through a pipeline, and the in-vehicle equipment The second end of the heat exchanger communicates with the second end of the high-temperature and high-pressure flow channel of the gas-liquid separator through a pipeline, and an on-off valve is installed on the pipeline to cut off or open the pipeline.

In one embodiment, the on-off valve includes a one-way stop valve or an electronic expansion valve. On the pipeline between the first end of the internal heat exchanger and the first end of the evaporator, on the pipeline between the second end of the high-temperature and high-pressure flow channel of the gas-liquid separator and the second end of the evaporator, and in-vehicle equipment An electronic expansion valve is installed on the pipeline between the second end of the heat exchanger and the second end of the high-temperature and high-pressure flow channel of the gas-liquid separator. One-way stop valves are installed on the remaining pipelines. The gas-liquid separator has a regenerator.

In one embodiment, the heat pump air conditioner further includes a temperature damper. When the temperature damper is opened, the air in the vehicle is guided to the evaporator and the internal heat exchanger. When the temperature damper is closed, the air in the vehicle only contacts the evaporator.

In one embodiment, carbon dioxide is output from the compressor, first flows through the external heat exchanger, then passes through the high-temperature and high-pressure channel of the gas-liquid separator, and finally returns to the compressor through the low-temperature and low-pressure channel of the gas-liquid separator, heat pump air conditioner Refrigeration. Carbon dioxide is output from the compressor, first flows through the high-temperature and high-pressure channel of the gas-liquid separator, then passes through the external heat exchanger, and finally returns to the compressor through the low-temperature and low-pressure channel of the gas-liquid separator, and the heat pump air conditioner is heated.

In one embodiment, the heat pump air conditioner implements the maximum cooling condition. The carbon dioxide is pressurized by the compressor to raise the temperature, enters the external heat exchanger to exchange heat with the outside air, and then flows through the high-pressure and high-temperature channel of the gas-liquid separator and enters the evaporator from The air in the car absorbs heat, and finally flows back to the compressor through the low-pressure and low-temperature passage of the gas-liquid separator. The heat pump air conditioner performs mixed air cooling mode, the temperature door is opened, the air in the car is guided to the internal heat exchanger and evaporator, the internal heat exchanger and the evaporator are not connected, and the carbon dioxide is boosted by the compressor to heat up, and enters the interior first The heat exchanger exchanges heat with the air in the car, then enters the external heat exchanger to exchange heat with the outside air, then flows through the high-pressure and high-temperature flow channel of the gas-liquid separator and enters the evaporator to absorb heat from the air in the car, and finally passes through the gas-liquid separation The low-pressure low-temperature passage of the device flows back to the compressor.

In one embodiment, the heat pump air conditioner also cools the in-vehicle equipment under the maximum cooling condition or the mixed air cooling condition, and part of the carbon dioxide flowing out from the high-pressure and high-temperature channel of the gas-liquid separator enters the heat exchanger of the in-vehicle equipment The heat is absorbed from the equipment in the car, and then flows back to the compressor through the low-pressure and low-temperature passage of the gas-liquid separator.

In one embodiment, the heat pump air conditioner implements the maximum heating condition, the temperature door is opened, the air in the car is guided to the internal heat exchanger and the evaporator, the internal heat exchanger and the evaporator are connected, and the carbon dioxide is boosted by the compressor to increase the temperature. Enter the internal heat exchanger and evaporator, exchange heat with the air in the car, and then enter the external heat exchanger through the high-pressure and high-temperature channel of the gas-liquid separator from the evaporator, exchange heat with the outside air, and finally pass through the low-pressure gas-liquid separator The low temperature runner flows back to the compressor.

In one embodiment, the heat pump air conditioner also cools the in-vehicle equipment under the maximum heating condition, and part of the carbon dioxide flowing out of the evaporator enters the heat exchanger of the in-vehicle equipment to absorb heat from the in-vehicle equipment, and then undergoes gas-liquid separation The low-pressure low-temperature passage of the device flows back to the compressor.

In one embodiment, the heat pump air conditioner implements the heating condition in the vehicle, the temperature damper is opened, the air in the vehicle is guided to the internal heat exchanger and the evaporator, the internal heat exchanger and the evaporator are connected, and the carbon dioxide is pressurized by the compressor to raise the temperature , enter the internal heat exchanger and evaporator, exchange heat with the air in the car, and then flow from the evaporator through the heat exchanger of the car equipment, and then flow back to the compressor through the low-pressure and low-temperature channel of the gas-liquid separator. Adjust the electronic expansion valve on the pipeline between the internal heat exchanger and the evaporator, and adjust the temperature damper. The air in the car is dehumidified by the evaporator and heated by the internal heat exchanger. The heat pump air conditioner performs dehumidification and heating.

The automobile heat pump air conditioner proposed by the present invention uses carbon dioxide as the working medium, and realizes the control and operation of the carbon dioxide heat pump system under different working conditions through different flow directions in the same system, and realizes on the same system: refrigeration, heating, including Continuous cooling and heating (dehumidification and heating), battery cooling, pure battery heat source heating cycle and other functions. By using battery heat source, heat source/cold source in the car, etc. to save energy and increase cruising range. At the same time, the operation circuit is simplified as much as possible, and measures such as integrated and integrated gas-liquid separator with regenerator function are used to reduce the system volume and achieve the purpose of reducing the cost of optimization.

Description of drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals represent the same features throughout, wherein:

Fig. 1 discloses a structural block diagram of a heat pump air conditioner for an automobile according to an embodiment of the present invention.

Detailed ways

In order to solve the problems existing in the existing vehicle air conditioners, especially the problem of excessive power consumption during heating, there is a proposal to apply the heat pump air conditioner to the vehicle air conditioner. When the heat pump air conditioner is heating, it will absorb heat from the external environment, which can improve the heating energy efficiency to a certain extent. However, the working fluid used in existing heat pump air conditioners is still HFC-134a. On the one hand, the use of HFC-134a as a refrigerant will gradually be limited. On the other hand, the physical characteristics of HFC-134a determine that at low temperatures, HFC-134a has poor heat transfer capacity, and PTC is still required to intervene to ensure comfort. Therefore, in a low temperature environment, the heat pump air conditioner using HFC-134a as the working fluid has limited help in improving energy consumption.

As a natural working substance, carbon dioxide has a GWP of only 1, is non-toxic and non-flammable, and is an ideal alternative refrigerant for vehicle air-conditioning systems. Compared with HFC-134a, when carbon dioxide is vaporized, its heat absorption performance is very good, which is very suitable for heat pump systems. The energy efficiency ratio (COP) of the carbon dioxide heat pump system is high under most working conditions, and the lower the ambient temperature is, the better the COP is. Therefore, a heat pump air conditioner using carbon dioxide as a working medium is an ideal choice for automotive air conditioners. Since the physical properties of carbon dioxide are different from HFC-134a, the structure of the heat pump air conditioner needs to be changed accordingly.

The invention proposes a heat pump air conditioner for an automobile using carbon dioxide as a working medium. Fig. 1 discloses a structural block diagram of a heat pump air conditioner for an automobile according to an embodiment of the present invention. Referring to FIG. 1 , the heat pump air conditioner of the automobile includes: a compressor 101 , an external heat exchanger 102 , a gas-liquid separator 105 , an evaporator 103 , and an internal heat exchanger 104 . The compressor 101, the external heat exchanger 102, the gas-liquid separator 105, the evaporator 103, and the internal heat exchanger 104 are connected to each other through pipelines, and on-off valves are respectively installed on each pipeline to cut off or open the corresponding pipeline. road to achieve different working conditions. The working fluid of the heat pump air conditioner is carbon dioxide. In one embodiment, the on-off valve installed on the pipeline includes a one-way stop valve or an electronic expansion valve.

The communication relationship among the compressor 101 , the external heat exchanger 102 , the gas-liquid separator 105 , the evaporator 103 , and the internal heat exchanger 104 will be described in detail below with reference to FIG. 1 .

The output of the compressor 101 is divided into two paths, which communicate with the first end A1 of the external heat exchanger 102 and the second end B2 of the internal heat exchanger 104 respectively. A first one-way stop valve 111 is installed on the communication pipeline between the compressor 101 and the first end A1 of the external heat exchanger 102, and a first one-way stop valve 111 is installed on the communication pipeline between the compressor 101 and the second end B2 of the internal heat exchanger 104. The second one-way stop valve 112 .

In one embodiment, the gas-liquid separator 105 is a gas-liquid separator with a regenerator, and the gas-liquid separator has a high-temperature and high-pressure flow path and a low-temperature and low-pressure flow path. The first end H1 of the high-temperature and high-pressure flow channel of the gas-liquid separator 105 communicates with the second end A2 of the external heat exchanger 102, and the second end H2 of the high-temperature and high-pressure flow channel of the gas-liquid separator 105 communicates with the second end A2 of the evaporator 103. Terminal C2 is connected. The first end L1 of the low-temperature and low-pressure flow path of the gas-liquid separator 105 communicates with the input of the compressor 101, and the second end L2 of the low-temperature and low-pressure flow path of the gas-liquid separator 105 communicates with the first end C1 of the evaporator 103 and the internal exchange. The first end B1 of the heater 104 communicates. The first end H1 of the high-temperature and high-pressure flow channel of the gas-liquid separator 105 is directly connected with the second end A2 of the external heat exchanger 102 through a pipeline, and no on-off valve is installed on the pipeline. A second electronic expansion valve 108 is installed on the communication pipeline between the second end H2 of the high temperature and high pressure channel of the gas-liquid separator 105 and the second end C2 of the evaporator 103 . The first end L1 of the low-temperature and low-pressure channel of the gas-liquid separator 105 is directly connected to the input of the compressor 101 , and no on-off valve is installed on the pipeline. A third one-way stop valve 113 is installed on the communication pipeline between the second end L2 of the low-temperature and low-pressure channel of the gas-liquid separator 105 and the first end C1 of the evaporator 103 . The first end C1 of the evaporator 103 communicates with the first end B1 of the internal heat exchanger 104, and a first Electronic expansion valve 107. As shown in Figure 1, the second end L2 of the low-temperature and low-pressure passage of the gas-liquid separator 105 is also communicated with the first end B1 of the internal heat exchanger 104 through a pipeline, but two switchboards are installed on the pipeline. The closed valves are the third one-way stop valve 113 and the first electronic expansion valve 107 respectively.

The first end B1 of the internal heat exchanger 104 is also communicated with the first end A1 of the external heat exchanger 102 through a pipeline, and a fifth one-way stop valve 110 is installed on the connecting pipeline.

In the illustrated embodiment, the heat pump air conditioner for the vehicle further includes an in-vehicle equipment heat exchanger 106, and in one embodiment, the in-vehicle equipment heat exchanger 106 is a water heat exchanger. The carbon dioxide and the cooling water of the equipment in the car exchange heat in the water heat exchanger. As shown in the figure, the first end D1 of the in-vehicle equipment heat exchanger 106 communicates with the second end L2 of the low-temperature and low-pressure flow path of the gas-liquid separator 105 through a pipeline, and this pipeline is directly connected. Install on-off valve. The second end D2 of the in-vehicle equipment heat exchanger 106 communicates with the second end H2 of the high-temperature and high-pressure flow channel of the gas-liquid separator 105 through a pipeline, and a third electronic expansion valve 109 is installed on this communication pipeline. As shown in the figure, since the second end H2 of the high-temperature and high-pressure flow channel of the gas-liquid separator 105 is also connected to the second electronic expansion valve 108, the second end H2 of the high-temperature and high-pressure flow channel of the gas-liquid separator 105 is connected to the vehicle interior. Between the second end D2 of the equipment heat exchanger 106, there are two opening and closing valves, the second electronic expansion valve 108 and the third electronic expansion valve 109, and the second end D2 of the equipment heat exchanger 106 in the vehicle is connected to the evaporation valve. Only the third electronic expansion valve 109 is separated between the second ends C2 of the valves 103 .

Continuing to refer to FIG. 1 , in the illustrated embodiment, the heat pump air conditioner of the automobile further includes a temperature damper 115 , which is used to guide the air in the vehicle to contact with the evaporator or the internal heat exchanger. When the temperature damper 115 is open, the interior air is directed to both the evaporator and the interior heat exchanger, and when the temperature damper 115 is closed, the interior air only contacts the evaporator. By adjusting the opening degree of the temperature damper 115, the amount of air in the vehicle that contacts the internal heat exchanger can be adjusted, which is the so-called mixed air mode.

By controlling the opening and closing of each one-way stop valve and electronic expansion valve mentioned above, the flow direction of carbon dioxide among various components can be controlled, thereby realizing different working conditions of the heat pump air conditioner of the automobile. Generally speaking, during the flow of carbon dioxide, carbon dioxide is output from the compressor, first flows through the external heat exchanger, then passes through the high-temperature and high-pressure flow channel of the gas-liquid separator, and finally returns through the low-temperature and low-pressure flow channel of the gas-liquid separator Compressor, the heat pump air conditioner performs cooling mode. The carbon dioxide is output from the compressor, first flows through the high-temperature and high-pressure channel of the gas-liquid separator, then passes through the external heat exchanger, and finally returns to the compressor through the low-temperature and low-pressure channel of the gas-liquid separator, then the heat pump air conditioner performs heating mode .

The following describes several typical working conditions of heat pump air conditioners in conjunction with Figure 1:

The heat pump air conditioner implements the maximum cooling condition: the first one-way stop valve 111 , the third one-way stop valve 113 and the second electronic expansion valve 108 are opened. The second one-way stop valve 112 , the fourth one-way stop valve 114 , the fifth one-way stop valve 110 , the first electronic expansion valve 107 and the third electronic expansion valve 109 are closed. The temperature damper 115 is closed, and the air in the car can only contact with the evaporator 103 . Carbon dioxide is pressurized and heated by the compressor 101, enters the external heat exchanger 102 through the first one-way stop valve 111 to exchange heat with the outside air, then flows through the high-pressure and high-temperature channel of the gas-liquid separator 105 and passes through the second electronic expansion valve 108 Enter the evaporator 103, exchange heat with the air inside the vehicle in the evaporator, absorb heat from the air inside the vehicle, and finally flow back to the compressor 101 through the third one-way stop valve 113 and the low-pressure and low-temperature channel of the gas-liquid separator 105 .

The heat pump air conditioner executes mixed air cooling mode: the second one-way stop valve 112 , the third one-way stop valve 113 , the fifth one-way stop valve 110 and the second electronic expansion valve 108 are opened. The first one-way stop valve 111 , the fourth one-way stop valve 114 , the first electronic expansion valve 107 and the third electronic expansion valve 109 are closed. The temperature damper 115 is partially opened, and interior air is directed to both the evaporator 103 and the interior heat exchanger 104 . Since the first electronic expansion valve 107 is closed and the fifth one-way stop valve 110 is opened, there is no communication between the internal heat exchanger 104 and the evaporator 103 , but there is communication between the internal heat exchanger 104 and the external heat exchanger 102 . The carbon dioxide is pressurized and heated by the compressor 101, first enters the internal heat exchanger 104 through the second one-way stop valve 112 to exchange heat with part of the air in the car, and then enters the external heat exchanger 102 through the fifth one-way stop valve 110 to exchange heat with the outside air. After heat exchange, it flows through the high-pressure and high-temperature channel of the gas-liquid separator 105 and enters the evaporator 103 through the second electronic expansion valve 108. In the evaporator, it exchanges heat with another part of the air in the car, absorbs heat from the air in the car, and finally The low-pressure and low-temperature passage through the gas-liquid separator 105 flows back to the compressor 101 through the third one-way stop valve 113 .

If the heat pump air conditioner still needs to cool the in-vehicle equipment under the maximum cooling condition or the mixed air cooling condition, the third electronic expansion valve 109 can be operated to open the third electronic expansion valve 109 . At this time, part of the carbon dioxide flowing out from the high-pressure and high-temperature flow channel of the gas-liquid separator 105 enters the in-vehicle equipment heat exchanger 106, exchanges heat with the cooling water of the in-vehicle equipment, and absorbs heat from the in-vehicle equipment. The rest of the carbon dioxide is combined and flows back to the compressor 101 through the low-pressure and low-temperature channel of the gas-liquid separator 105 . The cooling water of the in-vehicle equipment may be the cooling water of the on-vehicle battery to cool the on-vehicle battery.

The heat pump air conditioner implements the maximum heating condition: the second one-way stop valve 112 , the fourth one-way stop valve 114 , the first electronic expansion valve 107 and the second electronic expansion valve 108 are opened. The first one-way stop valve 111 , the third one-way stop valve 113 , the fifth one-way stop valve 110 and the third electronic expansion valve 109 are closed. The temperature damper 115 is opened and the interior air is directed to both the interior heat exchanger 104 and the evaporator 103 . Since the first electronic expansion valve 107 is open and the fifth one-way stop valve 110 is closed, the internal heat exchanger 104 communicates with the evaporator 103 , while the internal heat exchanger 104 does not communicate with the external heat exchanger 102 . The carbon dioxide is pressurized and heated by the compressor 101 , enters the internal heat exchanger 104 through the second one-way stop valve 112 , and then enters the evaporator 103 through the first electronic expansion valve 107 . Heat is exchanged with the interior air in the interior heat exchanger 104 and the evaporator 103 . After flowing out from the evaporator 103, it enters the high-pressure and high-temperature channel of the gas-liquid separator 105 through the second electronic expansion valve 108, enters the external heat exchanger 102, exchanges heat with the outside air, and finally passes through the fourth one-way stop valve 114 to undergo gas-liquid separation. The low-pressure and low-temperature passage of the device 105 flows back to the compressor 101.

If the heat pump air conditioner still needs to cool the in-vehicle equipment under the maximum heating condition, the third electronic expansion valve 109 can be operated to open the third electronic expansion valve 109 . At this time, a part of the carbon dioxide flowing out from the evaporator 103 enters the in-vehicle equipment heat exchanger 106 through the third electronic expansion valve 109, exchanges heat with the cooling water of the in-vehicle equipment, and absorbs heat from the in-vehicle equipment. The rest of the carbon dioxide is combined and flows back to the compressor 101 through the low-pressure and low-temperature channel of the gas-liquid separator 105 . The cooling water of the in-vehicle equipment may be the cooling water of the on-vehicle battery to cool the on-vehicle battery.

The heat pump air conditioner implements the heating condition in the car, such as using the heat generated by other components in the car, such as batteries, motors, power electronics, chargers, etc. for heating: the second one-way stop valve 112, the first electronic expansion valve 107 and The third electronic expansion valve 109 is opened. The first one-way stop valve 111 , the third one-way stop valve 113 , the fourth one-way stop valve 114 , the fifth one-way stop valve 110 and the second electronic expansion valve 108 are closed. The temperature damper 115 is opened and the interior air is directed to both the interior heat exchanger 104 and the evaporator 103 . Since the first electronic expansion valve 107 is open and the fifth one-way stop valve 110 is closed, the internal heat exchanger 104 communicates with the evaporator 103 , while the internal heat exchanger 104 does not communicate with the external heat exchanger 102 . The carbon dioxide is pressurized and heated by the compressor 101 , enters the internal heat exchanger 104 through the second one-way stop valve 112 , and then enters the evaporator 103 through the first electronic expansion valve 107 . Heat is exchanged with the interior air in the interior heat exchanger 104 and the evaporator 103 . Since the second electronic expansion valve 108 is closed and the third electronic expansion valve 109 is opened, the carbon dioxide flowing out from the evaporator 103 passes through the in-vehicle equipment heat exchanger 106, exchanges heat with the cooling water of the in-vehicle equipment, and absorbs heat from the in-vehicle equipment , and then flow back to the compressor 101 through the low-pressure and low-temperature channel of the gas-liquid separator 105 .

On the basis of the above-mentioned various heating conditions, adjust the first electronic expansion valve 107 on the pipeline between the internal heat exchanger 104 and the evaporator 103, and adjust the temperature damper 115, so that the air in the car is dehumidified by the evaporator 103 And heated by the internal heat exchanger 104, the heat pump air conditioner performs dehumidification and heating conditions.

The automobile heat pump air conditioner proposed by the present invention uses carbon dioxide as the working medium, and realizes the control and operation of the carbon dioxide heat pump system under different working conditions through different flow directions in the same system, and realizes on the same system: refrigeration, heating, including Continuous cooling and heating (dehumidification and heating), battery cooling, pure battery heat source heating cycle and other functions. By using battery heat source, heat source/cold source in the car, etc. to save energy and increase cruising range. At the same time, the operation circuit is simplified as much as possible, and measures such as integrated and integrated gas-liquid separator with regenerator function are used to reduce the system volume and achieve the purpose of reducing the cost of optimization.

The above-mentioned embodiments are provided for those who are familiar with the field to implement or use the present invention, and those who are familiar with the art can make various modifications or changes to the above-mentioned embodiments without departing from the inventive idea of the present invention. The scope of protection of the present invention is not limited by the above-mentioned embodiments, but should be the maximum scope consistent with the innovative features mentioned in the claims.

Claims (10)

1. a kind of heat pump air conditioner of automobile characterized by comprising compressor, external heat exchanger, gas-liquid separator, evaporator, Internal exchanger；

The output of compressor is connected to the second end of the first end of external heat exchanger and internal exchanger respectively；

The first end of high temperature and pressure runner of gas-liquid separator is connected to the second end of external heat exchanger, the high temperature of gas-liquid separator The second end of high pressure runner is connected to the second end of evaporator, the first end and compressor of the low-temp low-pressure runner of gas-liquid separator Input connection, the of the second end of low-temp low-pressure runner and the first end of evaporator of gas-liquid separator and internal exchanger One end connection；

The first end of evaporator is connected with the first end of internal exchanger；

The first end of internal exchanger is connected to the first end of external heat exchanger；

Wherein, all parts are interconnected by pipeline, open and close valve are equipped on pipeline to cut off or open the pipeline, described The working medium of heat pump air conditioner is carbon dioxide.

2. the heat pump air conditioner of automobile as described in claim 1, which is characterized in that further include in-vehicle device heat exchanger, car is set The second end of the low-temp low-pressure runner of the first end and gas-liquid separator of standby heat exchanger passes through pipeline connection, in-vehicle device heat exchanger Second end and gas-liquid separator high temperature and pressure runner second end by pipeline connection, open and close valve is installed to cut on pipeline It is disconnected or open the pipeline.

3. the heat pump air conditioner of automobile as claimed in claim 2, which is characterized in that the open and close valve include unidirectional stop valve or Electric expansion valve；

On pipeline between the first end of internal exchanger and the first end of evaporator, the high temperature and pressure runner of gas-liquid separator On pipeline between second end and the second end of evaporator, the high temperature of the second end of in-vehicle device heat exchanger and gas-liquid separator it is high It presses and electric expansion valve is installed on the pipeline between the second end of runner；

Unidirectional stop valve is installed on remaining pipeline；

The gas-liquid separator has regenerator.

4. the heat pump air conditioner of automobile as claimed in claim 2, which is characterized in that it further include temperature damper, temperature damper is opened, In-vehicle air is directed to evaporator and internal exchanger, and temperature damper is closed, and in-vehicle air is only contacted with evaporator.

5. the heat pump air conditioner of automobile as claimed in claim 4, which is characterized in that

Carbon dioxide is exported from compressor, external heat exchanger is first flowed through, using the high temperature and pressure runner of gas-liquid separator, and most Compressor, heat pump air conditioner refrigeration are returned by the low-temp low-pressure runner of gas-liquid separator eventually；

Carbon dioxide is exported from compressor, first flows through the high temperature and pressure runner of gas-liquid separator, is passing through external heat exchanger, and most Compressor, heat pump air conditioner heating are returned by the low-temp low-pressure runner of gas-liquid separator eventually.

6. the heat pump air conditioner of automobile as claimed in claim 5, which is characterized in that

Heat pump air conditioner executes maximum cooling condition, and carbon dioxide is heated up by compressor boost, empty into external heat exchanger and the external world Gas heat exchange passes through the high pressure-temperature runner of gas-liquid separator and enters evaporator and absorb heat from in-vehicle air, finally passes through gas-liquid The low-pressure low-temperature runner of separator flows back to compressor；

Heat pump air conditioner executes mixed wind cooling condition, and temperature damper is opened, and in-vehicle air is directed to internal exchanger and evaporator, It is not connected between internal exchanger and evaporator, carbon dioxide is heated up by compressor boost, is introduced into internal exchanger and car Air heat-exchange, enters back into external heat exchanger and outside air exchanges heat, and passes through the high pressure-temperature runner of gas-liquid separator and enters Evaporator absorbs heat from in-vehicle air, finally flows back to compressor by the low-pressure low-temperature runner of gas-liquid separator.

7. the heat pump air conditioner of automobile as claimed in claim 6, which is characterized in that heat pump air conditioner is in maximum cooling condition or mixes Also in-vehicle device is cooled down under wind cooling condition, the one of the carbon dioxide flowed out from the high pressure-temperature runner of gas-liquid separator Equipment heat exchanger absorbs heat from in-vehicle device into the car for part, flows back to compression using the low-pressure low-temperature runner of gas-liquid separator Machine.

8. the heat pump air conditioner of automobile as claimed in claim 5, which is characterized in that

Heat pump air conditioner executes maximum heating condition, and temperature damper is opened, and in-vehicle air is directed to internal exchanger and evaporator, Internal exchanger is connected to evaporator, and carbon dioxide is heated up by compressor boost, into internal exchanger and evaporator, with car Air heat-exchange, then enter external heat exchanger from evaporator by the high pressure-temperature runner of gas-liquid separator, it exchanges heat with outside air, Finally compressor is flowed back to by the low-pressure low-temperature runner of gas-liquid separator.

9. the heat pump air conditioner of automobile as claimed in claim 8, which is characterized in that

Heat pump air conditioner also cools down in-vehicle device under maximum heating condition, and one of the carbon dioxide flowed out from evaporator Equipment heat exchanger absorbs heat from in-vehicle device point into the car, flows back to compressor using the low-pressure low-temperature runner of gas-liquid separator.

10. the heat pump air conditioner of automobile as claimed in claim 5, which is characterized in that

Heat pump air conditioner executes interior heating condition, and temperature damper is opened, and in-vehicle air is directed to internal exchanger and evaporator, Internal exchanger is connected to evaporator, and carbon dioxide is heated up by compressor boost, into internal exchanger and evaporator, with car Air heat-exchange, then pass through in-vehicle device heat exchanger from evaporator, compression is flowed back to using the low-pressure low-temperature runner of gas-liquid separator Machine；

Adjust the electric expansion valve on the pipeline between internal exchanger and evaporator, and adjust temperature damper, in-vehicle air by Evaporator dehumidifies and is heated by internal exchanger, and heat pump air conditioner executes dehumidifying heating cycle.