Double heat exchanger heat exchange system with flash tank and automobile

Abstract

This utility model belongs to the technical field of heat exchange circulation systems, and discloses a dual heat exchanger heat exchange system with a flash tank and an automobile. The heat exchange system includes an electric compressor, a condenser, a flash tank, two heat exchangers, and two first throttling valves. The two heat exchangers are connected in parallel, and a flash tank is connected in series on the return pipe of at least one heat exchanger, positioned upstream of the heat exchangers. The outlets of the two heat exchangers are connected to the first input of the electric compressor, the output of the electric compressor is connected to the condenser, and the outlet of the condenser is connected to the inlet of the two heat exchangers. The two first throttling valves are respectively located at the inlet of the two return pipes. Through this arrangement, the proportion of the gas phase of the heat exchange medium entering the heat exchangers is significantly reduced, thereby improving the heat exchange capacity of the heat exchangers, further enhancing the performance coefficient of the entire heat exchange system, greatly reducing energy consumption, and improving the vehicle's range and user experience.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange circulation system technology, and in particular to a dual heat exchanger heat exchange system with a flash tank and an automobile. Background Technology

[0002] In recent years, driven by both policy support and market demand, the new energy vehicle industry has developed rapidly. However, car owners are facing increasingly serious range anxiety. Currently, the air conditioning systems of most new energy vehicles use traditional single-unit compression refrigeration cycles. When providing cooling to the vehicle, this system consumes extremely high energy, significantly reducing the vehicle's driving range. Especially in cold environments, the energy consumption of heat pumps increases significantly, further exacerbating the range anxiety problem.

[0003] Therefore, there is an urgent need for a dual heat exchanger system with a flash tank and a vehicle to solve the problems existing in the prior art. Utility Model Content

[0004] The purpose of this invention is to provide a dual heat exchanger system with a flash tank and a car, which can reduce energy consumption and thus effectively improve the vehicle's range.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A dual heat exchanger system with a flash tank includes: an electric compressor, a condenser, a flash tank, two heat exchangers, and two first throttling valves. The two heat exchangers are connected in parallel, and the flash tank is connected in series on the return line of at least one of the heat exchangers. The flash tank is located upstream of the heat exchangers. The outlets of the two heat exchangers are connected to the first input of the electric compressor. The output of the electric compressor is connected to the condenser. The outlet of the condenser is connected to the inlet of the two heat exchangers. The two first throttling valves are respectively located at the inlet of the two return lines.

[0007] Preferably, the liquid outlet of the flash tank is connected to the heat exchanger, and the gas outlet of the flash tank is connected in parallel with the heat exchanger and connected to the first input terminal of the electric compressor.

[0008] Preferably, the dual heat exchanger system with flash tank further includes an economizer, a gas supply line, and a second throttle valve. The economizer is connected in series between the outlet end of the condenser and the inlet ends of the two heat exchangers. The inlet end of the gas supply line is connected in parallel with the inlet end of the economizer. The outlet end of the gas supply line is connected to the second input end of the electric compressor. A heat transfer section is formed on the gas supply line that is in thermal contact with the economizer. The second throttle valve is located between the inlet end of the gas supply line and the heat transfer section.

[0009] Preferably, the first input end of the electric compressor is provided with a first temperature and pressure sensor, which is communicatively connected to the first throttle valve; the output end of the electric compressor is provided with a second temperature and pressure sensor, which is communicatively connected to the electric compressor; and the second input end of the electric compressor is provided with a third temperature and pressure sensor, which is communicatively connected to the second throttle valve.

[0010] Preferably, the dual heat exchanger system with flash tank further includes a hot gas bypass circuit, which is connected in parallel with the electric compressor. The inlet end of the hot gas bypass circuit is connected to the output end of the electric compressor, and the outlet end of the hot gas bypass circuit is connected to the first input end of the electric compressor. A third throttle valve is provided on the hot gas bypass circuit.

[0011] Preferably, the first throttle valve includes an electronic expansion throttle valve; and / or, the second throttle valve includes an electronic expansion throttle valve; and / or, the third throttle valve includes an electronic expansion throttle valve.

[0012] Preferably, the outlet end of the condenser is provided with a fourth temperature and pressure sensor, the outlet end of the economizer is provided with a fifth temperature and pressure sensor, and at least one outlet end of the heat exchanger is provided with a sixth temperature and pressure sensor.

[0013] Preferably, a liquid storage tank is provided between the outlet end of the condenser and the inlet end of the economizer.

[0014] Automobiles, including the aforementioned dual heat exchanger system with flash tank.

[0015] The beneficial effects of this utility model are:

[0016] This application provides a dual heat exchanger system with a flash tank and an automobile. Because the heat exchange system has a flash tank connected in series with the heat exchanger on the return pipe, the proportion of the gas phase of the heat exchange medium entering the heat exchanger can be greatly reduced, thereby improving the heat exchange capacity of the heat exchanger, further improving the performance coefficient of the entire heat exchange system, greatly reducing energy consumption, and thus effectively enhancing the vehicle's range and user experience. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the dual heat exchanger system with flash tank provided in this embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the structure of a dual heat exchanger system with a flash tank provided in other embodiments of this utility model.

[0019] In the picture:

[0020] 1. Electric compressor; 101. First input terminal; 102. Output terminal; 103. Second input terminal; 2. Condenser; 3. Flash tank; 301. Liquid outlet; 302. Gas outlet; 4. Heat exchanger; 5. First throttle valve; 6. Economizer; 7. Gas supply line; 701. Heat transfer section; 8. Second throttle valve; 9. First temperature and pressure sensor; 10. Second temperature and pressure sensor; 11. Third temperature and pressure sensor; 12. Fourth temperature and pressure sensor; 13. Fifth temperature and pressure sensor; 14. Sixth temperature and pressure sensor; 15. Liquid storage tank; 16. Hot gas bypass circuit; 17. Third throttle valve. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0025] The technical solution provided by this utility model is described below with reference to the accompanying drawings and specific embodiments.

[0026] See Figure 1 This application provides a dual heat exchanger system with a flash tank, including an electric compressor 1, a condenser 2, a flash tank 3, two heat exchangers 4, and two first throttling valves 5. The two heat exchangers 4 are connected in parallel, and a flash tank 3 is connected in series on the return pipe of at least one heat exchanger 4. The flash tank 3 is located upstream of the heat exchangers 4. The outlet ends of the two heat exchangers 4 are connected to the first input end 101 of the electric compressor 1, the output end 102 of the electric compressor 1 is connected to the condenser 2, the outlet end of the condenser 2 is connected to the inlet end of the two heat exchangers 4, and the two first throttling valves 5 are respectively located on the inlet ends of the two return pipes.

[0027] Specifically, when the heat exchange system is working, the low-temperature, low-pressure gaseous heat exchange medium enters the electric compressor 1 and is compressed into a high-temperature, high-pressure gaseous heat exchange medium. This high-temperature, high-pressure gaseous heat exchange medium then enters the condenser 2 and is condensed into a high-temperature, high-pressure liquid heat exchange medium, releasing heat. The high-temperature, high-pressure liquid heat exchange medium is then divided into two paths and enters the return pipelines of the two heat exchangers 4. When the high-temperature, high-pressure liquid heat exchange medium enters the pipeline equipped with the flash tank 3, it is first throttled and depressurized through the first throttling valve 5 into a gas-liquid two-phase heat exchange medium. After entering the flash tank 3, gas-liquid separation is achieved. The liquid heat exchange medium flows into the heat exchanger 4 through the outlet of the flash tank 3. After completing the heat exchange process with the heat exchange object in the heat exchanger 4, it forms a low-temperature, low-pressure gaseous heat exchange medium. The low-temperature, low-pressure gaseous heat exchange medium flowing out from the two return pipelines collects and re-enters the electric compressor 1, where it is compressed into a high-temperature, high-pressure gaseous heat exchange medium, thus forming a complete cycle.

[0028] In this embodiment, flash tanks 3 are installed on both return pipes, which greatly reduces the proportion of the gas phase of the heat exchange medium entering each heat exchanger 4, thereby improving the heat exchange capacity of each heat exchanger 4. Compared to installing a flash tank 3 on only one return pipe, the heat exchange between the flash tank and the heat exchange object is greatly increased, thus further improving the coefficient of performance of the entire heat exchange system and significantly reducing energy consumption. When this heat exchange system is applied to a vehicle refrigeration system, a refrigerant is used as the heat exchange medium, which can effectively increase the cooling capacity and simultaneously cool the passenger compartment and the battery. Refrigerants include, but are not limited to, R134a, R1234yf, CO2, and R290.

[0029] It should be noted that this heat exchange system is not limited to heating, but can also be used in general applications such as cooling and heating. This utility model does not limit itself to this application.

[0030] It should be further noted that in other parallel embodiments, the heat exchange system can also be configured with only one flash tank 3 on one of the return pipes, depending on actual usage requirements. In this case, the heat exchange performance of the heat exchanger 4 connected to the flash tank 3 is effectively enhanced. Therefore, setting only one flash tank 3 can also improve the cooling capacity of the heat exchange system to a certain extent and effectively reduce energy consumption, while also saving the installation cost of one flash tank 3. This is suitable for use scenarios with limited space and budget. Therefore, those skilled in the art can choose according to their usage requirements, and both of the above architectures fall within the protection scope of this utility model.

[0031] In one embodiment of this application, the liquid outlet 301 of the flash tank 3 is connected to the heat exchanger 4, and the gas outlet 302 of the flash tank 3 is connected in parallel with the heat exchanger 4 and connected to the first input terminal 101 of the electric compressor 1. When the high-temperature and high-pressure liquid heat exchange medium enters the flash tank 3 and achieves gas-liquid separation, the gaseous heat exchange medium can overflow from the gas outlet 302 of the flash tank 3 and mix with the low-temperature and low-pressure gaseous heat exchange medium after heat exchange in the heat exchanger 4. The mixed gaseous heat exchange medium then enters the electric compressor 1. This design effectively prevents the compressor from producing liquid slugging, thereby providing good protection for the electric compressor 1.

[0032] In one embodiment of this application, the first throttle valve 5 includes an electronic expansion valve. Compared with the commonly available thermal expansion valves, the electronic expansion valve has a faster adjustment response speed, reaching 0.1-0.3s, which is at least 5 times faster. Moreover, it has higher superheat control accuracy, stronger low-temperature adaptability, and a wider load adjustment range, enabling the heat exchange system to operate normally in harsh environments. Furthermore, it can automatically adjust the valve opening in real time according to the actual temperature of the high-temperature and high-pressure liquid heat exchange medium to automatically adjust the flow rate of the heat exchange medium flowing into the flash tank 3 or heat exchanger 4. This further improves the gas-liquid separation effect of the flash tank 3 and the heat exchange effect of the heat exchanger 4, effectively reducing the workload of operators and improving the safety and reliability of the heat exchange system.

[0033] In one embodiment of this application, the heat exchange system further includes an economizer 6, a gas supply line 7, and a second throttle valve 8. The inlet end of the gas supply line 7 is connected in parallel with the inlet end of the economizer 6, and the outlet end of the gas supply line 7 is connected to the second input end 103 of the electric compressor 1. A heat transfer section 701 is formed on the gas supply line 7 that is in thermal contact with the economizer 6. The second throttle valve 8 is disposed between the inlet end of the gas supply line 7 and the heat transfer section 701.

[0034] Specifically, during operation, after the high-temperature, high-pressure liquid heat exchange medium flows out of the condenser 2, a portion enters the economizer 6, while the other portion enters the make-up gas pipeline 7. Under the throttling action of the second throttle valve 8, its temperature and pressure are reduced, and it transforms from a liquid phase to a gas-liquid two-phase system. Subsequently, the phase-transformed heat exchange medium enters the economizer 6 along the make-up gas pipeline 7, where it is further heated by the higher-temperature, higher-pressure liquid heat exchange medium. This further transforms the remaining liquid heat exchange medium into a gaseous heat exchange medium, thereby reducing the proportion of liquid heat exchange medium in the make-up gas pipeline 7 and increasing the purity of the gaseous heat exchange medium. Afterward, the heat exchange medium that has exchanged heat with the economizer 6 continues to leave the economizer 6 along the make-up gas pipeline 7 and flows into the electric compressor 1, allowing the electric compressor 1 to obtain a portion of the gaseous heat exchange medium with a certain pressure and temperature.

[0035] The advantages of installing the economizer 6, the air supply line 7, and the second throttle valve 8 are:

[0036] Under low-temperature heating conditions, the gas supply line 7 can throttle and depressurize part of the liquid heat exchange medium to form a gaseous heat exchange medium, which is then injected into the electric compressor 1. This effectively increases the flow rate of the electric compressor 1, thereby avoiding the situation where the evaporation pressure of the heat exchanger 4 drops sharply due to the influence of ambient temperature, resulting in a sharp decrease in the mass flow rate of the gaseous heat exchange medium flowing out of the heat exchanger 4, which would otherwise lead to increased energy consumption and reduced heating capacity of the electric compressor 1. This reduces the wear and tear on the electric compressor 1 and extends its service life.

[0037] Under high-temperature refrigeration conditions, injecting a certain pressure of gaseous heat exchange medium into the electric compressor 1 further reduces the exhaust temperature of the electric compressor 1, allowing the temperature and pressure of the heat exchange medium after being condensed by the condenser 2 to remain within a safe range. This helps to maintain the temperature and pressure of the heat exchange medium within the heat exchange system within a normal range, helps to maintain a high refrigeration capacity, and improves the overall energy efficiency of the heat exchange system.

[0038] In one embodiment of this application, the second throttle valve 8 includes an electronic expansion valve. Similar to the first throttle valve 5, the second throttle valve 8 has a faster response speed, higher adjustment accuracy, and is more durable. Furthermore, by selecting an electronic expansion valve, the second throttle valve 8 can automatically adjust the valve opening in real time according to the actual temperature of the high-temperature, high-pressure liquid heat exchange medium, thereby automatically adjusting the total amount of heat exchange medium exchanging heat with the economizer 6. This, in turn, allows adjustment of the temperature and flow rate of the gaseous heat exchange medium entering the electric compressor 1, ensuring the safe and reliable operation of the electric compressor 1 under low-temperature heating or high-temperature cooling conditions.

[0039] In one embodiment of this application, a first temperature and pressure sensor 9 is provided at the first input end 101 of the electric compressor 1, a second temperature and pressure sensor 10 is provided at the output end 102 of the electric compressor 1, and a third temperature and pressure sensor 11 is provided at the second input end 103 of the electric compressor 1. The first temperature and pressure sensor 9 is communicatively connected to a first throttle valve 5 and can detect the actual temperature and actual pressure of the low-temperature, low-pressure gaseous heat exchange medium mixed from the two return pipelines. The first throttle valve 5 can control the valve opening based on the actual temperature and actual pressure, thereby adjusting the temperature and pressure of the gaseous heat exchange medium entering the electric compressor 1 to a suitable range by adjusting the unit flow rate of the liquid heat exchange medium in the heat exchanger 4. The second temperature and pressure sensor 10 is communicatively connected to the electric compressor 1 and can detect the actual temperature and actual pressure of the high-temperature, high-pressure gaseous heat exchange medium flowing out from the outlet end of the electric compressor 1. The electric compressor 1 can... The operating power is adjusted according to the actual temperature and actual gas pressure, so that the temperature and pressure of the high-temperature and high-pressure gaseous heat exchange medium flowing into the condenser 2 are adjusted to a suitable range, ensuring the working performance of the condenser 2; the third temperature and pressure sensor 11 is connected to the second throttle valve 8 and can detect the actual temperature and actual gas pressure of the gaseous heat exchange medium at the end of the gas supply line 7 and before entering the electric compressor 1. The second throttle valve 8 can control its own valve opening according to the actual temperature and actual gas pressure, and thus can adjust the temperature and pressure of the gaseous heat exchange medium after heat exchange with the economizer 6 by adjusting the flow rate of the liquid heat exchange medium flowing into the gas supply line 7.

[0040] By setting up the first temperature and pressure sensor 9, the second temperature and pressure sensor 10 and the third temperature and pressure sensor 11, real-time monitoring and precise control of each key position in the electric compressor 1 can be achieved, thereby improving the overall heat exchange performance and stability of the heat exchange system.

[0041] In addition, in one embodiment of this application, a fourth temperature and pressure sensor 12 is provided at the outlet end of the condenser 2, a fifth temperature and pressure sensor 13 is provided at the outlet end of the economizer 6, and a sixth temperature and pressure sensor 14 is provided at the outlet ends of both heat exchangers 4. The fourth temperature and pressure sensor 12 is communicatively connected to the condenser 2 and can detect the actual temperature and pressure of the high-temperature, high-pressure liquid heat exchange medium flowing out of the condenser 2, ensuring that the condenser 2 operates under optimal conditions. The fifth temperature and pressure sensor 13 is communicatively connected to the economizer 6 and can detect the actual temperature and pressure of the high-temperature, high-pressure liquid heat exchange medium flowing out of the outlet of the economizer 6. The economizer 6 can adjust its heat exchange capacity according to the actual temperature and pressure to ensure that the temperature and pressure of the heat exchange medium flowing out of the outlet of the economizer 6 are within the required range. The sixth temperature and pressure sensor 14 is communicatively connected to the corresponding heat exchanger 4 and can detect the actual temperature and pressure of the low-temperature, low-pressure gaseous heat exchange medium flowing out of the outlet of the heat exchanger 4. At this time, the heat exchanger 4 can adjust its operating power according to the actual temperature and pressure, thereby adjusting the heat exchange between the heat exchanger 4 and the heat exchange object, so that the temperature and pressure of the heat exchange medium flowing out of the outlet of the heat exchanger 4 can meet the requirements.

[0042] By setting the fourth temperature and pressure sensor 12, the fifth temperature and pressure sensor 13, and the sixth temperature and pressure sensor 14, the temperature and pressure of the heat exchange medium at key locations of the condenser 2, economizer 6, and heat exchanger 4 can be monitored and precisely controlled in real time, thereby helping to further improve the overall heat exchange performance and stability of the heat exchange system.

[0043] Preferably, the first temperature and pressure sensor 9, the second temperature and pressure sensor 10, the third temperature and pressure sensor 11, the fourth temperature and pressure sensor 12, the fifth temperature and pressure sensor 13, and the sixth temperature and pressure sensor 14 provided in the embodiments of this application are integrated temperature and pressure sensors, which are small in size, highly sensitive, and easy to assemble. For example, they can be any one of piezoelectric integrated temperature and pressure sensors, capacitive integrated temperature and pressure sensors, and fiber optic integrated temperature and pressure sensors.

[0044] In one embodiment of this application, the heat exchange system further includes a liquid storage tank 15. The two ends of the liquid storage tank 15 are physically connected to the outlet end of the condenser 2 and the inlet end of the economizer 6, respectively. After throttling, the liquid enters the flash tank. The liquid heat exchange medium flowing out of the condenser 2 can enter the liquid storage tank 15 for storage, and then enters the flash tank 3 through the first throttling valve 5 and the second throttling valve 8. This achieves the purpose of flow regulation of the liquid heat exchange medium, thereby reducing the working pressure of the economizer 6 and further improving the flexibility of the heat exchange system in regulating the flow of the heat exchange medium, while also achieving the function of balancing the refrigerant in the system. It should be noted that the condenser 2 can be applied to water-cooled or air-cooled applications; this utility model is not limited to this.

[0045] In some other alternative embodiments, reference Figure 2 As shown, the heat exchange system also includes a hot gas bypass circuit 16, which is connected in parallel with the electric compressor 1. The inlet end of the hot gas bypass circuit 16 is connected to the output end 102 of the electric compressor 1, and the outlet end of the hot gas bypass circuit 16 is also connected to the output end 102 of the electric compressor 1. This allows a portion of the high-temperature, high-pressure gaseous heat exchange medium flowing out from the output end 102 of the electric compressor 1 to be recirculated back to the first input end 101 of the electric compressor 1. A third throttle valve 17 is installed on the hot gas bypass circuit 16, which controls the flow rate of the gaseous heat exchange medium in the hot gas bypass circuit 16. Through the above configuration, overheating of the suction gas can be prevented, liquid slugging can be prevented, failure of the electric compressor 1 under low load conditions can be avoided, the heat exchange system can be kept running orderly under low suction pressure, and frequent start-stop of the electric compressor 1 can be avoided, thereby effectively improving the oil return performance and operational safety and reliability of the electric compressor 1.

[0046] In one embodiment of this application, the third throttle valve 17 includes an electronic expansion throttle valve. Similar to the first throttle valve 5 and the second throttle valve 8, the third throttle valve 17 has a faster response speed and higher adjustment accuracy. In addition, by selecting an electronic expansion throttle valve, the third throttle valve 17 can automatically adjust the valve opening according to the actual temperature of the high-temperature and high-pressure gaseous heat exchange medium, thereby automatically adjusting the flow rate of the heat exchange medium circulating back to the electric compressor 1 per unit time, thus ensuring the stable working performance of the electric compressor 1.

[0047] The first throttle valve 5, the second throttle valve 8, and the third throttle valve 17 provided in this application embodiment can effectively improve the automatic intelligence of the heat exchange system. The first throttle valve 5, the second throttle valve 8, and the third throttle valve 17 can be any one of a pulse-type electronic expansion valve, an electromagnetic electronic expansion valve, or a linear electronic expansion valve. This utility model is not limited to any one of these.

[0048] This application embodiment also provides a vehicle, including the dual heat exchanger system with a flash tank described above. In the heat exchange system, a flash tank 3 connected in series with the heat exchanger 4 is provided on the return pipe. Before the heat exchange medium flowing out of the condenser 2 flows into the heat exchanger 4, it can first achieve gas-liquid separation through the flash tank 3, ensuring that the purity of the liquid heat exchange medium entering the heat exchanger 4 is high. This greatly increases the heat exchange between the heat exchanger 4 and the heat exchange object, thereby improving the vehicle's cooling or heating performance, reducing energy consumption, and significantly improving the vehicle's range and user experience.

[0049] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A dual-heat exchanger system with a flash tank, characterized in that, include: An electric compressor (1), a condenser (2), a flash tank (3), two heat exchangers (4) and two first throttle valves (5) are provided. The two heat exchangers (4) are connected in parallel, and the flash tank (3) is connected in series on the return pipe where at least one of the heat exchangers (4) is located. The flash tank (3) is located on the upstream side of the heat exchangers (4). The outlet ends of the two heat exchangers (4) are connected to the first input end (101) of the electric compressor (1). The output end (102) of the electric compressor (1) is connected to the condenser (2). The outlet end of the condenser (2) is connected to the inlet end of the two heat exchangers (4). The two first throttle valves (5) are respectively located on the inlet ends of the two return pipes.

2. The dual heat exchanger system with a flash tank according to claim 1, characterized in that, The liquid outlet (301) of the flash tank (3) is connected to the heat exchanger (4), and the gas outlet (302) of the flash tank (3) is connected in parallel with the heat exchanger (4) and connected to the first input terminal (101) of the electric compressor (1).

3. The dual heat exchanger system with a flash tank according to claim 1, characterized in that, The dual heat exchanger system further includes an economizer (6), a gas supply line (7), and a second throttle valve (8). The economizer (6) is connected in series between the outlet end of the condenser (2) and the inlet ends of the two heat exchangers (4). The inlet end of the gas supply line (7) is connected in parallel with the inlet end of the economizer (6). The outlet end of the gas supply line (7) is connected to the second input end (103) of the electric compressor (1). A heat transfer section (701) is formed on the gas supply line (7) that is in thermal contact with the economizer (6). The second throttle valve (8) is located between the inlet end of the gas supply line (7) and the heat transfer section (701).

4. The dual heat exchanger system with a flash tank according to claim 3, characterized in that, The electric compressor (1) has a first temperature and pressure sensor (9) at its first input end (101), which is connected in communication with the first throttle valve (5). The electric compressor (1) has a second temperature and pressure sensor (10) at its output end (102), which is connected in communication with the electric compressor (1). The electric compressor (1) has a third temperature and pressure sensor (11) at its second input end (103), which is connected in communication with the second throttle valve (8).

5. The dual heat exchanger system with a flash tank according to claim 3, characterized in that, The dual heat exchanger heat exchange system further includes a hot gas bypass circuit (16), which is connected in parallel with the electric compressor (1). The inlet end of the hot gas bypass circuit (16) is connected to the output end (102) of the electric compressor (1), and the outlet end of the hot gas bypass circuit (16) is connected to the first input end (101) of the electric compressor (1). A third throttle valve (17) is provided on the hot gas bypass circuit (16).

6. The dual heat exchanger system with a flash tank according to claim 5, characterized in that, The first throttle valve (5) includes an electronic expansion throttle valve; and / or, the second throttle valve (8) includes an electronic expansion throttle valve; and / or, the third throttle valve (17) includes an electronic expansion throttle valve.

7. The dual heat exchanger system with a flash tank according to claim 3, characterized in that, The outlet end of the condenser (2) is provided with a fourth temperature and pressure sensor (12), the outlet end of the economizer (6) is provided with a fifth temperature and pressure sensor (13), and at least one of the heat exchangers (4) is provided with a sixth temperature and pressure sensor (14).

8. The dual heat exchanger system with a flash tank according to claim 3, characterized in that, A liquid storage tank (15) is provided between the outlet end of the condenser (2) and the inlet end of the economizer (6).

9. An automobile, characterized in that, Includes the dual heat exchanger heat exchange system with a flash tank as described in any one of claims 1-8.

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