Outdoor heat exchange device for electric vehicle heat pump air conditioner

Abstract

The present application relates to an outdoor heat exchange device for an electric vehicle heat pump air conditioner, which includes a heat exchanger mechanism and a liquid storage mechanism. The heat exchanger mechanism includes an outdoor heat exchanger, an upper flow channel and a lower flow channel, a refrigerant inlet, a refrigerant outlet, a refrigerant separation outlet and a refrigerant separation inlet; the liquid storage mechanism includes a liquid receiver, an electromagnetic three-way valve, and a liquid receiver inlet and a liquid receiver outlet opened on the liquid receiver. The liquid receiver inlet is connected in through connection with the refrigerant separation outlet, and the liquid receiver outlet is connected in through connection with the refrigerant separation inlet. The upper valve port and the lower valve port of the electromagnetic three-way valve are respectively arranged upward and downward, and the side valve port of the electromagnetic three-way valve is arranged at the liquid receiver outlet. The present application realizes the gas-liquid separation of the two-phase refrigerant by adding a liquid receiver and arranging an electromagnetic three-way valve in the liquid receiver, so that the outdoor heat exchanger is a subcooled condenser during refrigeration and a superheated evaporator during heating. The air conditioner performance can be improved and the air conditioner system can be simplified during both refrigeration and heating, effectively saving the cost of the air conditioner system.

Description

Technical Field

[0001] This application relates to the technical field of heat exchangers, and particularly to an outdoor heat exchange device for an electric vehicle heat pump air conditioner. Background Art

[0002] With the development of science and technology and new energy, pure electric vehicles have been increasingly promoted and applied due to their unique advantages. The development of pure electric vehicles has led to the development of automotive heat pump air conditioners. More and more new energy vehicles are equipped with heat pump air conditioners. Currently, the outdoor heat exchangers used in heat pump air conditioners on the market do not have a subcooling function, resulting in the need to add a liquid receiver and a coaxial tube to achieve the subcooling effect in the air conditioning system. When the heat pump cycles, a gas-liquid separator needs to be added to ensure that the refrigerant entering the compressor is in a gaseous state to avoid liquid slugging. The actual situation is that the two-phase refrigerant passing through the gas-liquid separator cannot be completely separated, so there is still a risk of liquid slugging in the compressor in the current solution. Summary of the Invention

[0003] An embodiment of this application provides an outdoor heat exchange device for an electric vehicle heat pump air conditioner to solve the technical problems in the related art that the outdoor heat exchanger used in the heat pump air conditioner does not have a subcooling function, a liquid receiver and a coaxial tube need to be added to achieve the subcooling effect, and when heating, a gas-liquid separator needs to be added to ensure that the refrigerant entering the compressor is in a gaseous state to avoid the risk of liquid slugging in the compressor, and the existing gas-liquid separator cannot completely separate the two-phase refrigerant.

[0004] In a first aspect, this application provides an outdoor heat exchange device for an electric vehicle heat pump air conditioner, including a heat exchanger mechanism and a liquid storage mechanism. The heat exchanger mechanism includes an outdoor heat exchanger, an upper flow channel and a lower flow channel arranged in the outdoor heat exchanger, a refrigerant inlet and a refrigerant outlet opened on one side of the outdoor heat exchanger and arranged vertically, and a refrigerant separation outlet and a refrigerant separation inlet opened on the other side of the outdoor heat exchanger and corresponding to and connected to the flow channel outlet of the upper flow channel and the flow channel inlet of the lower flow channel; the liquid storage mechanism includes a liquid receiver, an electromagnetic three-way valve, and a liquid receiver inlet and a liquid receiver outlet opened on the liquid receiver. The liquid receiver inlet is connected in through connection with the refrigerant separation inlet, the liquid receiver outlet is connected in through connection with the refrigerant separation outlet, the upper valve port and the lower valve port of the electromagnetic three-way valve are respectively arranged upward and downward, and the side valve port of the electromagnetic three-way valve is arranged at the liquid receiver outlet.

[0005] In some embodiments, the liquid storage mechanism further includes a return bend pipeline. The height of the upper pipe orifice of the return bend pipeline is higher than that of the lower pipe orifice, and the lower pipe orifice is hermetically butted against the upper valve port.

[0006] In some embodiments, the length extension direction of the return bend pipeline is arranged vertically.

[0007] In some embodiments, the height of the bottom of the return bend pipeline is not higher than that of the lower valve port.

[0008] In some embodiments, the height of the refrigerant separation outlet is higher than that of the refrigerant outlet.

[0009] In some embodiments, the liquid receiver is an expansion tank.

[0010] In some embodiments, the connecting pipeline between the liquid receiver inlet and the refrigerant separation outlet extends horizontally to the outer wall of the leftmost pipe of the return bend pipeline and has a gap with the outer wall of the leftmost pipe of the return bend pipeline.

[0011] In some embodiments, the electromagnetic three-way valve is replaced by an electromagnetic four-way valve, at least one valve port of the electromagnetic four-way valve is arranged at the refrigerant separation outlet, and at least one valve port is arranged downward.

[0012] In some embodiments, when the working medium entering the refrigerant inlet is gaseous refrigerant, the upper valve port and the side valve port of the electromagnetic three-way valve are controlled to open and communicate with each other, and the lower valve port is closed.

[0013] In some embodiments, when the working medium entering the refrigerant inlet is liquid refrigerant, the upper valve port of the electromagnetic three-way valve is controlled to close, and the side valve port and the lower valve port are opened and communicate with each other.

[0014] The beneficial effects brought by the technical solution provided in this application include:

[0015] The embodiment of this application provides an outdoor heat exchange device for an electric vehicle heat pump air conditioner. By adding a liquid receiver and arranging an electromagnetic three-way valve in the liquid receiver, the gas-liquid separation of the two-phase refrigerant is realized, so that the outdoor heat exchanger is a subcooled condenser during refrigeration and a superheated evaporator during heating. During both refrigeration and heating, the air conditioner performance can be improved and the air conditioner system can be simplified, effectively saving the cost of the air conditioner system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the refrigerant flow direction during the refrigeration cycle of the outdoor heat exchange device for the electric vehicle heat pump air conditioner provided in the embodiment of this application;

[0018] Figure 2 It is a schematic diagram of the refrigerant flow direction during the heating cycle of the outdoor heat exchange device for the electric vehicle heat pump air conditioner provided in the embodiment of this application.

[0019] In the figure: 1. Outdoor heat exchanger; 11. Refrigerant inlet; 12. Refrigerant outlet; 14. Refrigerant separation outlet; 13. Refrigerant separation inlet; 2. Liquid receiver; 21. Liquid receiver inlet; 22. Liquid receiver outlet; 3. Electromagnetic three-way valve; 31. Upper valve port; 32. Lower valve port; 33. Side valve port; 4. Return bend pipeline; 41. Upper pipe orifice; 42. Lower pipe orifice. Specific implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0021] The existing heat pump air conditioners all adopt outdoor heat exchangers without subcooling function, resulting in the need to add a liquid receiver and a coaxial tube to achieve the subcooling effect in the air conditioning system. During the heat pump cycle, a gas-liquid separator needs to be added to ensure that the refrigerant entering the compressor is in a gaseous state to avoid liquid slugging in the compressor of the heat pump air conditioner. However, in actual situations, the two-phase refrigerant passing through the gas-liquid separator cannot be completely separated, so there is still a risk of liquid slugging in the compressor of the existing heat pump air conditioners.

[0022] In view of this, the embodiments of the present application provide an outdoor heat exchange device for an electric vehicle heat pump air conditioner, which can solve the technical problems that the existing outdoor heat exchanger 1 of the pure electric vehicle heat pump air conditioner has no subcooling function, and it is necessary to add a liquid receiver 2 and a coaxial tube to achieve the subcooling effect. During the heat pump cycle, it is necessary to add a gas-liquid separator to prevent liquid slugging, and the two-phase refrigerant passing through the gas-liquid separator cannot be completely separated, and there is still a risk of liquid slugging.

[0023] Please refer to Figure 1, the outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by this application includes a heat exchanger mechanism and a liquid storage mechanism; the heat exchanger mechanism includes an outdoor heat exchanger 1, a refrigerant inlet 11, a refrigerant outlet 12, a refrigerant separation outlet 14, and a refrigerant separation inlet 13; an upper flow channel and a lower flow channel are provided inside the outdoor heat exchanger 1, and the refrigerant inlet 11 and the refrigerant outlet 12 are opened on one side of the outdoor heat exchanger 1 and arranged vertically, corresponding to and penetrating through the inlet of the upper flow channel and the outlet of the lower flow channel respectively, for accessing the heat exchange medium of the indoor unit of the air conditioner in the electric vehicle, and the heat exchange medium can be a high-temperature and high-pressure gaseous refrigerant or a low-temperature liquid refrigerant; the refrigerant separation outlet 14 and the refrigerant separation inlet 13 are respectively opened on the other side of the outdoor heat exchanger 1 and arranged vertically and respectively correspond to and penetrate through the outlet of the upper flow channel and the inlet of the lower flow channel; the liquid storage mechanism includes a liquid storage tank 2, a liquid storage tank inlet 21, a liquid storage tank outlet 22, and an electromagnetic three-way valve 3. The liquid storage tank inlet 21 and the liquid storage tank outlet 22 are respectively connected and communicated with the refrigerant separation outlet 14 and the refrigerant separation inlet 13. The side valve port 33 of the electromagnetic three-way valve 3 is located at the liquid storage tank outlet 22, and the upper valve port 31 and the lower valve port 32 of the electromagnetic three-way valve 3 are arranged vertically.

[0024] The schematic diagram of the refrigerant flow direction of the outdoor heat exchange device during the refrigeration cycle is as Figure 1 shown. When the refrigerant inlet 11 of the outdoor heat exchanger 1 accesses a high-temperature and high-pressure gaseous refrigerant, the outdoor heat exchanger 1 functions as a condenser. The gaseous refrigerant enters the upper flow channel and generates a two-phase refrigerant of liquid refrigerant and gaseous refrigerant after cooling. Then, it enters the liquid storage tank 2 through the refrigerant separation outlet 14. Control the side valve port 33 of the electromagnetic three-way valve 3 to communicate with the lower valve port 32, and the side valve port 33 of the electromagnetic three-way valve 3 is not communicated with the upper valve port 31 of the electromagnetic three-way valve 3. The two-phase refrigerant entering the liquid storage tank 2 realizes spatial stratification. The liquid refrigerant at the bottom flows through the side valve port 33 via the lower valve port 32 of the electromagnetic three-way valve 3 that are communicated, and then flows into the lower flow channel through the refrigerant separation inlet 13 to be further cooled into a supercooled liquid refrigerant and flows out through the refrigerant outlet 12. The flow direction of the high-temperature and high-pressure gaseous refrigerant is ①→③→⑦→⑤→④→②.

[0025] The schematic diagram of the refrigerant flow direction of the outdoor heat exchanger 1 during the heat pump cycle of the outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by this application is as Figure 2As shown in the figure. The two-phase refrigerant at low temperature and low pressure enters the outdoor heat exchanger 1 from the refrigerant inlet 11. At this time, the outdoor heat exchanger 1 functions as an evaporator. After the two-phase refrigerant evaporates in the upper flow channel, it enters the liquid receiver 2. At this time, the liquid receiver 2 functions as a gas-liquid separator. It is controlled that the side valve port 33 of the electromagnetic three-way valve 3 is not connected to the lower valve port 32 of the electromagnetic three-way valve 3, and the side valve port 33 of the electromagnetic three-way valve 3 is connected to the upper valve port 31 of the electromagnetic three-way valve 3. The two-phase refrigerant entering the liquid receiver 2 is spatially stratified under the action of gravity. It is controlled that the side valve port 33 of the electromagnetic three-way valve 3 is not connected to the lower valve port 32 of the electromagnetic three-way valve 3, and the side valve port 33 of the electromagnetic three-way valve 3 is connected to the upper valve port 31 of the electromagnetic three-way valve 3. The upper gaseous refrigerant in the two-phase refrigerant in the liquid receiver 2 flows from the upper valve port 31 of the electromagnetic three-way valve 3 to the side valve port 33 of the electromagnetic three-way valve 3, and then enters the outdoor heat exchanger 1 functioning as an evaporator through the refrigerant separation inlet 13 to be further evaporated into superheated gaseous refrigerant, and flows out through the refrigerant outlet 12 and enters the compressor of the heat pump air conditioner. The flow direction of the two-phase refrigerant at low temperature and low pressure is ①→③→⑥→⑤→④→②. The presence of liquid refrigerant is completely eliminated in the gaseous refrigerant entering the compressor, effectively avoiding the occurrence of liquid slugging in the compressor. Since the liquid refrigerant in the liquid receiver 2 enters after the evaporation of the two-phase refrigerant at low temperature and low pressure, the amount of liquid refrigerant remaining in it is very small and can be stored in the liquid receiver 2.

[0026] In one embodiment, the schematic diagram of the refrigerant flow direction of the outdoor heat exchanger 1 during the heat pump cycle of the outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by the present application is as Figure 2 As shown in the figure. The two-phase refrigerant at low temperature and low pressure enters the outdoor heat exchanger 1 from the refrigerant inlet 11. At this time, the outdoor heat exchanger 1 functions as an evaporator. After the two-phase refrigerant evaporates in the upper flow channel, it enters the liquid receiver 2. At this time, the liquid receiver 2 functions as a gas-liquid separator. It is controlled that the side valve port 33 of the electromagnetic three-way valve 3 is not connected to the lower valve port 32 of the electromagnetic three-way valve 3, and the side valve port 33 of the electromagnetic three-way valve 3 is connected to the upper valve port 31 of the electromagnetic three-way valve 3. The two-phase refrigerant entering the liquid receiver 2 is spatially stratified under the action of gravity. It is controlled that the side valve port 33 of the electromagnetic three-way valve 3 is not connected to the lower valve port 32 of the electromagnetic three-way valve 3, and the side valve port 33 of the electromagnetic three-way valve 3 is connected to the upper valve port 31 of the electromagnetic three-way valve 3. The upper gaseous refrigerant in the two-phase refrigerant in the liquid receiver 2 flows from the upper valve port 31 of the electromagnetic three-way valve 3 to the side valve port 33 of the electromagnetic three-way valve 3, and then enters the outdoor heat exchanger 1 functioning as an evaporator through the refrigerant separation inlet 13 to be further evaporated into superheated gaseous refrigerant, and flows out through the refrigerant outlet 12 and enters the compressor of the heat pump air conditioner. The presence of liquid refrigerant is completely eliminated in the gaseous refrigerant entering the compressor, effectively avoiding the occurrence of liquid slugging in the compressor. A drain valve port is provided on the liquid receiver 2 for discharging the stored liquid refrigerant when the liquid receiver 2 functions as a gas-liquid separator, avoiding excessive liquid storage in the liquid receiver 2 during long-term heating of the heat pump air conditioner, which affects the normal circulation of the gaseous refrigerant.

[0027] In one embodiment, the schematic diagram of the refrigerant flow direction of the outdoor heat exchanger 1 during the heat pump cycle of the outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by the present application is as shown in Figure 2 the figure. The low-temperature and low-pressure two-phase refrigerant enters the outdoor heat exchanger 1 from the refrigerant inlet 11. At this time, the outdoor heat exchanger 1 functions as an evaporator. After the two-phase refrigerant evaporates through the upper flow channel, it enters the accumulator 2. At this time, the accumulator 2 functions as a gas-liquid separator. The side valve port 33 of the electromagnetic three-way valve 3 is controlled to be not connected to the lower valve port 32 of the electromagnetic three-way valve 3, and the side valve port 33 of the electromagnetic three-way valve 3 is connected to the upper valve port 31 of the electromagnetic three-way valve 3. The two-phase refrigerant entering the accumulator 2 is spatially stratified under the action of gravity. The side valve port 33 of the electromagnetic three-way valve 3 is controlled to be not connected to the lower valve port 32 of the electromagnetic three-way valve 3, and the side valve port 33 of the electromagnetic three-way valve 3 is connected to the upper valve port 31 of the electromagnetic three-way valve 3. The upper gaseous refrigerant in the two-phase refrigerant in the accumulator 2 flows to the side valve port 33 of the electromagnetic three-way valve 3 through the upper valve port 31 of the electromagnetic three-way valve 3, and then enters the outdoor heat exchanger 1 functioning as an evaporator through the refrigerant separation inlet 13 and is further evaporated into superheated gaseous refrigerant, which flows out through the refrigerant outlet 12 and enters the compressor of the heat pump air conditioner. The presence of liquid refrigerant is completely eliminated in the gaseous refrigerant entering the compressor, effectively avoiding the occurrence of liquid slugging in the compressor. After the heat pump air conditioner finishes heating or during the heating interval, the lower valve port 32 and the side valve port 33 of the electromagnetic three-way valve 3 in the accumulator 2 are controlled to be opened and connected, and the upper valve port 31 of the electromagnetic three-way valve 3 is controlled to be closed to discharge the accumulated liquid refrigerant in the accumulator 2. At this time, the refrigerant outlet 12 of the outdoor heat exchanger 1 is not connected to the compressor, and the refrigerant outlet 12 is only used to discharge the accumulated liquid-phase refrigerant in the accumulator 2. The flow channel of the outdoor heat exchanger 1 may not be in the heating or cooling working condition, and the lower flow channel is only used to discharge the liquid-phase refrigerant.

[0028] The outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by the present application realizes the complete separation of the two-phase refrigerant of the outdoor heat exchanger 1 by setting the accumulator 2 and the electromagnetic three-way valve 3, thoroughly avoiding the occurrence of liquid slugging in the heat pump air conditioner compressor, realizing the intensive design of the outdoor heat exchanger 1 as a subcooled condenser during refrigeration and a superheated evaporator during heating, and can effectively improve the refrigeration or heating performance of the air conditioner and effectively save the cost of the air conditioning system.

[0029] In one embodiment, a return-bend pipe is provided in the liquid reservoir 2. The lower pipe orifice 42 of the return-bend pipe is hermetically and penetratively butted with the upper valve orifice 31 of the electromagnetic three-way valve 3, achieving the effect of waterproofing at the butting position. There is a height difference between the upper pipe orifice 41 and the upper pipe orifice 41 of the return-bend pipe, which is used to prevent excessive liquid refrigerant from remaining in the liquid reservoir 2 when the liquid reservoir 2 is used as a gas-liquid separator and submerging the upper valve orifice 31 of the electromagnetic three-way valve 3, thereby hindering the smooth entry of gaseous refrigerant into the upper valve orifice 31 of the electromagnetic three-way valve 3. The gaseous refrigerant enters through the upper pipe orifice 41 of the return-bend pipe, enters the upper valve orifice 31 of the electromagnetic three-way valve 3 through the return-bend pipe, and then enters the lower flow channel of the outdoor heat exchanger 1 through the refrigerant separation inlet 13 and continues to evaporate into superheated gaseous refrigerant, flows out of the outdoor heat exchanger 1 through the refrigerant outlet 12, and enters the compressor for the heating of the heat pump air conditioner. At the same time, the return-bend pipe 4 also has the effect of slowing down the flow of the gaseous refrigerant, avoiding overcurrent impact damage to the valve orifice of the electromagnetic three-way valve 3.

[0030] In one embodiment, the extending direction of the pipeline length of the return-bend pipe 4 is vertically arranged, so as to facilitate the smooth entry of the gaseous refrigerant in the liquid reservoir 2 into the upper valve orifice 31 of the electromagnetic three-way valve 3.

[0031] In one embodiment, the height of the bottom of the return-bend pipe 4 is not lower than the lower valve orifice 32 of the electromagnetic three-way valve 3, as much as possible to prevent the gaseous refrigerant in the liquid reservoir 2 from being heat-exchanged by the relatively low-temperature liquid refrigerant at the bottom layer in the return-bend pipe and generating liquid refrigerant, further eliminating the possibility of liquid refrigerant entering through the upper valve orifice 31.

[0032] In one embodiment, the height of the bottom of the return-bend pipe 4 is lower than the position of the upper valve orifice 31 of the electromagnetic three-way valve 3. When the liquid reservoir 2 is used as a gas-liquid separator, if the amount of liquid refrigerant remaining in the liquid reservoir 2 exceeds the bottom of the return-bend pipe 4, and the gaseous refrigerant in the return-bend pipe 4 inevitably generates a small amount of liquid refrigerant due to heat exchange with the relatively low-temperature liquid refrigerant on the outer wall of the pipe, the liquid refrigerant accumulates in the bottom space of the pipeline of the return-bend pipe 4 under the action of gravity and will not be driven by the gaseous refrigerant with slowed flow in the return-bend pipe 4 to the upper valve orifice 31 of the electromagnetic three-way valve 3, further eliminating the possibility of liquid refrigerant entering through the upper valve orifice 31 of the electromagnetic three-way valve 3 and more effectively preventing the occurrence of liquid hammer in the compressor of the heat pump air conditioner.

[0033] In the transformed embodiment of the present application, the electromagnetic three-way valve 3 can also be implemented as an electromagnetic four-way valve, a five-way solenoid valve, etc., as long as one of the valve orifices is provided at the liquid reservoir outlet 22, at least one valve orifice is used for the flow of gaseous refrigerant, and at least one valve orifice is used for the flow of liquid refrigerant.

[0034] In a more specific embodiment, the outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by the present application includes a heat exchanger mechanism and a liquid storage mechanism. The heat exchanger mechanism includes an outdoor heat exchanger 1, a refrigerant inlet 11, a refrigerant outlet 12, a refrigerant separation outlet 14, and a refrigerant separation inlet 13. An upper flow channel and a lower flow channel are provided in the outdoor heat exchanger 1. The refrigerant inlet 11 and the refrigerant outlet 12 are opened on one side of the outdoor heat exchanger 1 and are arranged vertically, corresponding to and communicating with the inlet of the upper flow channel and the outlet of the lower flow channel respectively, for connecting the heat exchange medium of the indoor unit of the air conditioner in the electric vehicle. The heat exchange medium can be a high-temperature and high-pressure gaseous refrigerant or a low-temperature liquid refrigerant. The refrigerant separation outlet 14 and the refrigerant separation inlet 13 are respectively opened on the other side of the outdoor heat exchanger 1 and are arranged vertically, corresponding to and communicating with the outlet of the upper flow channel and the inlet of the lower flow channel respectively. The liquid storage mechanism includes a liquid receiver 2, a liquid receiver inlet 21, a liquid receiver outlet 22, and an electromagnetic four-way valve. The liquid receiver inlet 21 and the liquid receiver outlet 22 are respectively communicated and docked with the refrigerant separation outlet 14 and the refrigerant separation inlet 13. One side valve port of the electromagnetic four-way valve is located at the liquid receiver outlet 22, and the upper valve port and the lower valve port of the electromagnetic four-way valve are arranged vertically.

[0035] During the refrigeration cycle of the outdoor heat exchange device, when the refrigerant inlet 11 of the outdoor heat exchanger 1 is connected to a high-temperature and high-pressure gaseous refrigerant, the outdoor heat exchanger 1 functions as a condenser. The gaseous refrigerant enters the upper flow channel and is cooled to generate a two-phase refrigerant of liquid refrigerant and gaseous refrigerant, and then enters the liquid receiver 2 through the refrigerant separation outlet 14. It is controlled that the left valve port and the right valve port, and the left valve port and the lower valve port of the electromagnetic four-way valve are all communicated, and the left valve port of the electromagnetic four-way valve is not communicated with the upper valve port of the electromagnetic four-way valve. The two-phase refrigerant entering the liquid receiver 2 is spatially stratified. The liquid refrigerant at the bottom flows through the lower valve port and the right valve port of the communicated electromagnetic four-way valve, then through the left valve port, and then flows into the lower flow channel through the refrigerant separation inlet 13 and is further cooled into a supercooled liquid refrigerant and flows out through the refrigerant outlet 12. The right valve port and the lower valve port are used to jointly accelerate the discharge of the liquid refrigerant in the liquid receiver 2 and improve the circulation speed of the liquid refrigerant.

[0036] When the outdoor heat exchanger 1 operates in a heat pump cycle, the low-temperature and low-pressure two-phase refrigerant enters the outdoor heat exchanger 1 from the refrigerant inlet 11. At this time, the outdoor heat exchanger 1 functions as an evaporator. After the two-phase refrigerant evaporates in the upper flow channel, it enters the liquid storage device 2. At this time, the liquid storage device 2 functions as a gas-liquid separator. The side valve port of the electromagnetic four-way valve is blocked from the lower valve port of the electromagnetic four-way valve, and the side valve port of the electromagnetic four-way valve is communicated with the upper valve port of the electromagnetic four-way valve. The two-phase refrigerant entering the liquid storage device 2 is spatially stratified under the action of gravity. The left valve port of the electromagnetic four-way valve is blocked from the lower valve port of the electromagnetic four-way valve and the right valve port of the electromagnetic four-way valve. The side valve port of the electromagnetic four-way valve is communicated with the upper valve port of the electromagnetic four-way valve. The upper gaseous refrigerant in the two-phase refrigerant in the liquid storage device 2 flows to the side valve port of the electromagnetic four-way valve through the upper valve port of the electromagnetic four-way valve, and then enters the outdoor heat exchanger 1 functioning as an evaporator through the refrigerant separation inlet 13, where it is further evaporated into superheated gaseous refrigerant and flows out through the refrigerant outlet 12 and enters the compressor of the heat pump air conditioner.

[0037] In one embodiment, the outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by the present application includes a heat exchanger mechanism and a liquid storage mechanism; the heat exchanger mechanism includes an outdoor heat exchanger 1, a refrigerant inlet 11, a refrigerant outlet 12, a refrigerant separation outlet 14 and a refrigerant separation inlet 13; an upper flow channel and a lower flow channel are provided in the outdoor heat exchanger 1. The refrigerant inlet 11 and the refrigerant outlet 12 are opened on one side of the outdoor heat exchanger 1 and are arranged vertically, corresponding to and communicating with the inlet of the upper flow channel and the outlet of the lower flow channel respectively, for connecting the heat exchange medium of the indoor unit of the air conditioner in the electric vehicle. The heat exchange medium can be a high-temperature and high-pressure gaseous refrigerant or a low-temperature liquid refrigerant; the refrigerant separation outlet 14 and the refrigerant separation inlet 13 are respectively opened on the other side of the outdoor heat exchanger 1 and are arranged vertically, corresponding to and communicating with the outlet of the upper flow channel and the inlet of the lower flow channel respectively; the liquid storage mechanism includes a liquid storage device 2, a liquid storage device inlet 21, a liquid storage device outlet 22 and an electromagnetic three-way valve 3. The liquid storage device inlet 21 and the liquid storage device outlet 22 are respectively communicated and docked with the refrigerant separation outlet 14 and the refrigerant separation inlet 13. The side valve port of the electromagnetic three-way valve 3 is located at the liquid storage device outlet 22, and the upper valve port and the lower valve port of the electromagnetic three-way valve 3 are arranged vertically. The connecting pipeline between the liquid storage device inlet 21 and the refrigerant separation outlet 14 extends horizontally to the outer wall of the leftmost pipe of the return bend pipeline 4 and has a gap with the outer wall of the leftmost pipe of the return bend pipeline 4. To enable the outer wall of the return bend pipeline 4 to play a role in buffering the impact of the refrigerant entering the inner cavity of the liquid storage device 2, avoiding the impact of a large flow of refrigerant on the liquid refrigerant remaining in the liquid storage device 2 and generating surges, which affects the structural stability of the entire device and the normal operation of the refrigerant cycle. At the same time, the return bend pipeline can also provide a condensation bed for the liquid phase refrigerant in the two-phase refrigerant entering the liquid storage device 2 and play a role in preliminary separation of the two-phase refrigerant entering the condenser.

[0038] In one embodiment, the outdoor heat exchange device for an electric vehicle heat pump air conditioner provided by the present application includes a heat exchanger mechanism and a liquid storage mechanism; the heat exchanger mechanism includes an outdoor heat exchanger 1, a refrigerant inlet 11, a refrigerant outlet 12, a refrigerant separation outlet 14, and a refrigerant separation inlet 13; an upper flow channel and a lower flow channel are provided inside the outdoor heat exchanger 1, and the refrigerant inlet 11 and the refrigerant outlet 12 are opened on one side of the outdoor heat exchanger 1 and arranged vertically, corresponding to and communicating with the inlet of the upper flow channel and the outlet of the lower flow channel respectively, for accessing the heat exchange medium of the indoor unit of the air conditioner in the electric vehicle, and the heat exchange medium can be a high-temperature and high-pressure gaseous refrigerant or a low-temperature liquid refrigerant; the refrigerant separation outlet 14 and the refrigerant separation inlet 13 are respectively opened on the other side of the outdoor heat exchanger 1 and arranged vertically and respectively correspond to and communicate with the outlet of the upper flow channel and the inlet of the lower flow channel; the liquid storage mechanism includes a liquid storage tank 2, a liquid storage tank inlet 21, a liquid storage tank outlet 22, and an electromagnetic three-way valve 3. The liquid storage tank inlet 21 and the liquid storage tank outlet 22 are respectively communicated and docked with the refrigerant separation outlet 14 and the refrigerant separation inlet 13. The side valve port of the electromagnetic three-way valve 3 is located at the liquid storage tank outlet 22, and the upper valve port and the lower valve port of the electromagnetic three-way valve 3 are arranged vertically; a return bend pipeline 4 is provided inside the liquid storage tank 2, and the length extension direction of the return bend pipeline 4 is arranged vertically; the connecting pipeline between the liquid storage tank inlet 21 and the refrigerant separation outlet 14 extends horizontally to the outer wall of the leftmost pipe of the return bend pipeline 4 and has a gap with the outer wall of the leftmost pipe of the return bend pipeline 4. To achieve the effect that the outer wall of the return bend pipeline 4 slows down the impact of the refrigerant entering the inner cavity of the liquid storage tank 2, avoiding the impact of a large flow of refrigerant on the liquid refrigerant retained in the liquid storage tank 2 and generating surges, which affects the structural stability of the entire device and the normal operation of the refrigerant cycle. At the same time, the return bend pipeline can also provide a condensation bed for the liquid-phase refrigerant in the two-phase refrigerant entering the liquid storage tank 2. The liquid refrigerant condensed on the return bend pipeline 4 flows down along the vertical pipe wall to the bottom of the liquid storage tank 2, achieving a better preliminary separation effect on the two-phase refrigerant entering the liquid storage tank 2.

[0039] The principle / usage method of the embodiment of the present application is as follows:

[0040] When the electric vehicle heat pump air conditioner cools, the outdoor heat exchanger 1 is used as a condenser, and the lower valve port and the side valve port of the electromagnetic three-way valve 3 in the liquid storage tank 2 are controlled to communicate; when the electric vehicle heat pump air conditioner heats, the outdoor heat exchanger 1 is used as an evaporator, and the upper valve port and the side valve port of the electromagnetic three-way valve 3 in the liquid storage tank 2 are controlled to communicate, discharging the superheated gaseous refrigerant to the compressor.

[0041] In this application, a liquid accumulator 2 is added to the existing outdoor heat pump heat exchanger 1. There is an electromagnetic three-way valve 3 inside the liquid accumulator 2. After the refrigerant passes through the liquid accumulator 2, it returns to the outdoor heat exchanger 1 for subcooling again, achieving the effect of a traditional subcooled condenser. At the same time, during the heat pump cycle, the liquid accumulator 2 becomes a gas-liquid separator through the switching of the valve port. After the refrigerant flows through the gas-liquid separator, it returns to the outdoor heat exchanger for superheating and then enters the compressor to ensure that the refrigerant entering the compressor is superheated gas.

[0042] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising", or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0044] The above description is only the specific implementation manner of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An outdoor heat exchange device for an electric vehicle heat pump air conditioner, characterized in that, Comprising: A heat exchanger mechanism, including an outdoor heat exchanger, an upper flow channel and a lower flow channel provided in the outdoor heat exchanger, a refrigerant inlet and a refrigerant outlet which are arranged vertically on one side of the outdoor heat exchanger, and a refrigerant separation outlet and a refrigerant separation inlet which are arranged on the other side of the outdoor heat exchanger and are correspondingly connected to the flow channel outlet of the upper flow channel and the flow channel inlet of the lower flow channel; A liquid storage mechanism, including a liquid storage device, an electromagnetic three-way valve, and a liquid storage device inlet and a liquid storage device outlet provided on the liquid storage device. The liquid storage device inlet is connected to the refrigerant separation outlet in a through manner, the liquid storage device outlet is connected to the refrigerant separation inlet in a through manner. The upper valve port and the lower valve port of the electromagnetic three-way valve are respectively arranged upwards and downwards, and the side valve port of the electromagnetic three-way valve is arranged at the liquid storage device outlet; The upper valve port is used for the upper gaseous refrigerant to flow in, and the lower valve port is used for the lower liquid refrigerant to flow in.

2. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 1, characterized in that, The liquid storage mechanism further includes a return bend pipeline. The height of the upper pipe orifice of the return bend pipeline is higher than that of the lower pipe orifice. The lower pipe orifice is hermetically docked with the upper valve port.

3. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 2, wherein The length extension direction of the return bend pipeline is arranged vertically.

4. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 2, wherein, The height of the bottom of the return bend pipeline is not higher than that of the lower valve port.

5. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 1, wherein The height of the refrigerant separation outlet is higher than that of the refrigerant outlet.

6. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 1, characterized in that, The liquid storage device is an expansion water tank.

7. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 2, wherein, The connecting pipeline between the liquid storage device inlet and the refrigerant separation outlet extends horizontally to the outer wall of the leftmost pipe of the return bend pipeline and has a gap with the outer wall of the leftmost pipe of the return bend pipeline; 8. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 1, characterized in that, The electromagnetic three-way valve is replaced with an electromagnetic four-way valve. At least one side valve port of the electromagnetic four-way valve is arranged at the refrigerant separation outlet. The upper valve port and the lower valve port of the electromagnetic four-way valve are arranged vertically; The upper valve port is used for the upper gaseous refrigerant to flow in, and the lower valve port is used for the lower liquid refrigerant to flow in.

9. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 1, characterized in that, When the working medium entering from the refrigerant inlet is a gaseous refrigerant, control the upper valve port and the side valve port of the electromagnetic three-way valve to open and communicate with each other, and the lower valve port is closed.

10. The outdoor heat exchange device for an electric vehicle heat pump air conditioner according to claim 1, characterized in that, When the working medium entering from the refrigerant inlet is a liquid refrigerant, control the upper valve port of the electromagnetic three-way valve to be closed, and the side valve port and the lower valve port to open and communicate with each other.

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