A vehicle carbon dioxide two-stage throttling with intermediate cooling heat pump air conditioning system

Abstract

The utility model belongs to air conditioning technical field, concretely relates to a carbon dioxide two-stage throttling with intermediate cooling heat pump air conditioning system for vehicle, include: compressor, the output of compressor, the first port of first heat exchanger and the first port of second heat exchanger are connected with the three ports of first electric three-way valve communication respectively, the liquid inlet of liquid storage tank is connected with the first port of intermediate heat exchanger communication, the second port of intermediate heat exchanger is connected with the first port of second electronic expansion valve communication, the second port of second electronic expansion valve, the second port of first heat exchanger and the second port of second heat exchanger are connected with the three ports of third electric three-way valve communication respectively. Dry carbon dioxide gas, all will pass through intermediate heat exchanger before entering the input of compressor, utilize the carbon dioxide medium of temperature still higher to heat, thereby reduced carbon dioxide electric compressor power consumption, more energy -conserving.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, specifically relating to a vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling. Background Technology

[0002] With the advancement of global energy conservation and emission reduction policies and the rapid development of the electric vehicle market, improving the energy efficiency and optimizing the environmental performance of automotive heat pump air conditioning systems has become a key focus of industry technological breakthroughs. Traditional automotive heat pump systems mostly use Freon-based refrigerants, but their high greenhouse effect potential has led to their gradual replacement by natural refrigerants such as carbon dioxide. However, when carbon dioxide is used as a refrigerant, its low critical temperature and high operating pressure result in a significant decrease in heating efficiency at low temperatures and a substantial increase in compressor power consumption. Existing automotive carbon dioxide heat pump systems mostly employ a single-stage throttling cycle, where the carbon dioxide gas entering the compressor is not heated. In cold environments, this leads to excessively low gas temperatures entering the compressor, exacerbating compression power consumption and limiting system efficiency improvements. Utility Model Content

[0003] Therefore, this invention aims to solve the problem in the prior art where the system does not heat the carbon dioxide gas entering the compressor, resulting in excessively low gas levels in cold environments, which exacerbates compression power consumption and limits system efficiency improvement.

[0004] Therefore, the technical solution adopted is a vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling, comprising: a compressor; the output end of the compressor, the first port of the first heat exchanger, and the first port of the second heat exchanger are respectively connected to the three ports of the first electric three-way valve; the second port of the first heat exchanger, the first port of the first electronic expansion valve, and the second port of the second heat exchanger are respectively connected to the three ports of the second electric three-way valve; the liquid outlet of the liquid storage tank is connected to the second port of the first electronic expansion valve; the liquid inlet of the liquid storage tank is connected to the first port of the intercooler; the second port of the intercooler is connected to the first port of the second electronic expansion valve; the second port of the second electronic expansion valve, the second port of the first heat exchanger, and the second port of the second heat exchanger are respectively connected to the three ports of the third electric three-way valve; the third port of the intercooler is connected to the outlet end of the gas-liquid separator; the first port of the second heat exchanger, the first port of the first heat exchanger, and the inlet end of the gas-liquid separator are respectively connected to the three ports of the fourth electric three-way valve; and the fourth port of the intercooler is connected to the input end of the compressor.

[0005] Preferably, both the first heat exchanger and the second heat exchanger are equipped with PTC defrosters.

[0006] Preferably, a first pressure transmitter is installed on the connecting pipeline between the output end of the compressor and the first electric three-way valve.

[0007] Preferably, a second pressure transmitter is installed on the connecting pipeline between the second electronic expansion valve and the third electric valve.

[0008] Preferably, a third pressure transmitter is installed on the connecting pipeline between the gas-liquid separator and the intermediate heat exchanger.

[0009] Preferably, a fourth pressure transmitter is installed on the connecting pipeline between the intermediate heat exchanger and the compressor.

[0010] The present invention has the following advantages: In the process of cooling and heating, the system uses a first electronic expansion valve and a second electronic expansion valve for two-stage throttling. Before entering the input end of the compressor, the dry carbon dioxide gas passes through an intermediate heat exchanger and is heated by the still relatively high-temperature carbon dioxide medium, thereby reducing the power consumption of the carbon dioxide electric compressor and making it more energy-efficient. At the same time, the low-temperature carbon dioxide gas after passing through the two-stage throttling has a better cooling effect after passing through the first heat exchanger.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0012] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] The components are as follows: 1. Compressor; 2. First heat exchanger; 3. Second heat exchanger; 4. First electric three-way valve; 5. First electronic expansion valve; 6. Second electric three-way valve; 7. Liquid storage tank; 8. Intermediate heat exchanger; 9. Second electronic expansion valve; 10. Third electric three-way valve; 11. Gas-liquid separator; 12. Fourth electric three-way valve; 13. PTC defroster; 14. First pressure transmitter; 15. Second pressure transmitter; 16. Third pressure transmitter; 17. Fourth pressure transmitter. Detailed Implementation

[0016] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0018] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] This utility model provides a vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling, such as... Figure 1As shown, the system includes: a compressor 1, the output end of the compressor 1, the first port of the first heat exchanger 2 and the first port of the second heat exchanger 3 respectively connected to the three ports of the first electric three-way valve 4, the second port of the first heat exchanger 2, the first port of the first electronic expansion valve 5 and the second port of the second heat exchanger 3 respectively connected to the three ports of the second electric three-way valve 6, the liquid outlet of the liquid storage tank 7 connected to the second port of the first electronic expansion valve 5, the liquid inlet of the liquid storage tank 7 connected to the first port of the intermediate heat exchanger 8, the second port of the intermediate heat exchanger 8 connected to the first port of the second electronic expansion valve 9, the second port of the second electronic expansion valve 9, the second port of the first heat exchanger 2 and the second port of the second heat exchanger 3 respectively connected to the three ports of the third electric three-way valve 10, the third port of the intermediate heat exchanger 8 connected to the outlet end of the gas-liquid separator 11, the first port of the second heat exchanger 3, the first port of the first heat exchanger 2 and the inlet end of the gas-liquid separator 11 respectively connected to the three ports of the fourth electric three-way valve 12, and the fourth port of the intermediate heat exchanger 8 connected to the input end of the compressor 1. The gas-liquid separator 11 is used to separate liquid carbon dioxide from carbon dioxide gas. The liquid carbon dioxide is stored in the gas-liquid separator 11 and released slowly to ensure that the dry carbon dioxide gas enters the compressor 1.

[0021] Both the first heat exchanger 2 and the second heat exchanger 3 are equipped with PTC defrosters 13. A first pressure transmitter 14 is installed on the connecting pipeline between the output end of the compressor 1 and the first electric three-way valve 4. A second pressure transmitter 15 is installed on the connecting pipeline between the second electronic expansion valve 9 and the third electric valve 10. A third pressure transmitter 16 is installed on the connecting pipeline between the gas-liquid separator 11 and the intermediate heat exchanger 8. A fourth pressure transmitter 17 is installed on the connecting pipeline between the intermediate heat exchanger 8 and the compressor 1. The first pressure transmitter 14, the second pressure transmitter 15, the third pressure transmitter 16, and the fourth pressure transmitter 17 are all used to monitor the pressure in the pipeline and prevent abnormal pressure.

[0022] The heating process is as follows: The carbon dioxide electric compressor 1 compresses carbon dioxide into a high-temperature, high-pressure gas. The first electric three-way valve 4 controls the high-temperature medium to enter the first heat exchanger 2 for heat dissipation, heating the cabin. Simultaneously, the PTC defroster 13 provides auxiliary heating to the cabin. The condensed medium is controlled by the second electric three-way valve 6, passing through the first electronic expansion valve 5 for a first-stage throttling before entering the liquid storage tank 7. The refrigerant from the liquid storage tank 7 enters the intermediate heat exchanger 8 for heat exchange, then passes through the second electronic expansion valve 9 for a second-stage throttling before being controlled by the third electric valve 10 to enter the second heat exchanger 3 for evaporation. The evaporated low-temperature, low-pressure medium is controlled by the fourth electric three-way valve 12 to enter the gas-liquid separator 11, separating the liquid carbon dioxide. The separated, low-temperature, dry medium is heated by the intermediate heat exchanger 8 and returns to the compressor 1's suction port, completing the heating cycle. The PTC defroster on the first heat exchanger 2 simultaneously provides auxiliary heating. During heating, the PTC defroster on the second heat exchanger 3 frosts and begins defrosting.

[0023] The refrigeration process is as follows: The carbon dioxide electric compressor 1 compresses the carbon dioxide medium into a high-temperature and high-pressure gas. The first electric three-way valve 4 controls the high-temperature medium to enter the second heat exchanger 3 for heat dissipation. The condensed medium is controlled by the second electric three-way valve 6 to pass through the first electronic expansion valve 5 for throttling and then enters the liquid storage tank 7 for storage. The low-temperature refrigerant in the liquid storage tank enters the intermediate heat exchanger 8 for heat exchange and then enters the second electronic expansion valve 9 for secondary throttling. The third electric valve 10 controls the medium to enter the first heat exchanger 2 for evaporation, cooling the cabin. The low-temperature and low-pressure medium after evaporation enters the gas-liquid separator 11 through the fourth electric three-way valve 12 to separate the liquid carbon dioxide. The low-temperature and dry gaseous carbon dioxide is heated by the intermediate heat exchanger 8 and then returns to the suction port of the compressor 1 to complete the refrigeration cycle.

[0024] Because the system uses a first electronic expansion valve 5 and a second electronic expansion valve 9 for two-stage throttling during the cooling and heating process, the dry carbon dioxide gas passes through the intermediate heat exchanger 8 before entering the input end of the compressor 1. It is heated by the still relatively high-temperature carbon dioxide medium, thereby reducing the power consumption of the carbon dioxide electric compressor and making it more energy-efficient. At the same time, the low-temperature carbon dioxide gas after passing through the two-stage throttling has a better cooling effect after passing through the first heat exchanger 2.

[0025] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling, characterized in that, include: The compressor (1), the output end of the compressor (1), the first port of the first heat exchanger (2), and the first port of the second heat exchanger (3) are respectively connected to the three ports of the first electric three-way valve (4). The second port of the first heat exchanger (2), the first port of the first electronic expansion valve (5), and the second port of the second heat exchanger (3) are respectively connected to the three ports of the second electric three-way valve (6). The liquid outlet of the liquid storage tank (7) is connected to the second port of the first electronic expansion valve (5). The liquid inlet of the liquid storage tank (7) is connected to the first port of the intermediate heat exchanger (8). The second port of the intermediate heat exchanger (8) is connected to the first... The first port of the second electronic expansion valve (9) is connected, the second port of the second electronic expansion valve (9), the second port of the first heat exchanger (2) and the second port of the second heat exchanger (3) are respectively connected to the three ports of the third electric three-way valve (10), the third port of the intermediate heat exchanger (8) is connected to the outlet end of the gas-liquid separator (11), the first port of the second heat exchanger (3), the first port of the first heat exchanger (2) and the inlet end of the gas-liquid separator (11) are respectively connected to the three ports of the fourth electric three-way valve (12), and the fourth port of the intermediate heat exchanger (8) is connected to the input end of the compressor (1).

2. The automotive carbon dioxide dual-stage throttling and intercooling heat pump air conditioning system according to claim 1, characterized in that, Both the first heat exchanger (2) and the second heat exchanger (3) are equipped with PTC defrosters (13).

3. A vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling as described in claim 1, characterized in that, A first pressure transmitter (14) is installed on the connecting pipeline between the output end of the compressor (1) and the first electric three-way valve (4).

4. A vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling as described in claim 1, characterized in that, A second pressure transmitter (15) is installed on the connecting pipeline between the second electronic expansion valve (9) and the third electric three-way valve (10).

5. A vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling as described in claim 1, characterized in that, A third pressure transmitter (16) is installed on the connecting pipeline between the gas-liquid separator (11) and the intermediate heat exchanger (8).

6. A vehicle-mounted carbon dioxide dual-stage throttling heat pump air conditioning system with intercooling as described in claim 1, characterized in that, A fourth pressure transmitter (17) is installed on the connecting pipeline between the intermediate heat exchanger (8) and the compressor (1).

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