Indirect thermal management system and automobile

Abstract

The utility model relates to the technical field of automobile air conditioners, in particular to an indirect type heat management system and an automobile. The indirect thermal management system comprises a refrigerant loop, a gas sensor and a controller; the refrigerant loop and the gas sensor are arranged in an automobile forecabin; the refrigerant loop comprises a compressor, a first electromagnetic valve, a condenser, an electronic expansion valve and an evaporator which are connected in sequence; the controller is preset with a concentration preset value; the gas sensor can detect the gas concentration and send the detected gas concentration value to the controller, and when the detected gas concentration value reaches a preset concentration value, the controller controls the first electromagnetic valve and the electronic expansion valve to be closed. According to the indirect type heat management system and the automobile, the problems that an existing air conditioning system does not have a safety protection function, effective measures cannot be taken when a refrigerant leaks, and when the refrigerant leaks to a certain concentration, people and the automobile are possibly threatened, and even explosion occurs are solved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile air conditioning, and in particular to an indirect thermal management system and an automobile. Background Art

[0002] With the restriction of the use of automotive refrigerant R134a, the new generation of refrigerants, led by R290 (propane) and R744 (carbon dioxide), will face technological innovation and industrial improvement. R290 is a natural working fluid, which has certain advantages in refrigerant replacement. Its standard boiling point is lower and it can be used in lower ambient temperatures. It has a heating performance far exceeding that of R134a at ambient temperatures below -10°C, and even has a heating COP close to that of a transcritical CO2 heat pump under severe cold conditions of -20°C.

[0003] R290 has an A3 flammability rating and is explosive. R290 refrigerant may explode when its concentration is between 2.1% and 9.5% in a confined space and the ignition temperature reaches 470°C.

[0004] However, the existing air conditioning heat pump system has no safety protection function. When the refrigerant leaks, no effective measures can be taken. When the refrigerant leaks to a certain concentration, it may pose a threat to people and vehicles, or even cause an explosion. Utility Model Content

[0005] The purpose of the present application is to provide an indirect thermal management system and a car, thereby solving the problem that the existing air-conditioning system has no safety protection function, and when the refrigerant leaks, no effective measures can be taken. When the refrigerant leaks to a certain concentration, it may pose a threat to people and vehicles, and even cause an explosion.

[0006] According to the first aspect of the present application, an indirect thermal management system is provided, which includes a refrigerant circuit, a gas sensor and a controller; the refrigerant circuit and the gas sensor are both arranged in the front cabin of a car; the refrigerant circuit includes a compressor, a first solenoid valve, a condenser, an electronic expansion valve and an evaporator connected in sequence; the controller is pre-set with a predetermined concentration value; the gas sensor can detect the gas concentration and send the detected gas concentration value to the controller, and when the detected gas concentration value reaches the predetermined concentration value, the controller controls the first solenoid valve and the electronic expansion valve to close.

[0007] In any of the above technical solutions, further, the indirect thermal management system also includes a first cold water branch, a first hot water branch and a heat exchange unit; the refrigerant circuit and the gas sensor are both arranged in the front cabin of the vehicle, the heat exchange unit is arranged in the passenger compartment of the vehicle, and the heat exchange unit can exchange heat with the gas in the passenger compartment of the vehicle; the inlet of the first cold water branch is connected to the cold water outlet of the evaporator, and the outlet of the first cold water branch is connected to the cold water inlet of the evaporator; in the first state, the cold water in the first cold water branch can flow through the heat exchange unit; the inlet of the first hot water branch is connected to the hot water outlet of the condenser, and the outlet of the first hot water branch is connected to the hot water inlet of the condenser; in the second state, the hot water in the first hot water branch can flow through the heat exchange unit.

[0008] In any of the above technical solutions, further, the indirect thermal management system also includes a cooling unit and a motor group; in the first state, the hot water in the first hot water branch can flow through the cooling unit and the motor group in sequence; in the second state, the cold water in the first cold water branch flows through the cooling unit and the motor group in sequence.

[0009] In any of the above technical solutions, further, the indirect thermal management system also includes a first four-way valve and a second four-way valve, the first cold water branch includes a first pipeline and a second pipeline, and the first hot water branch includes a third pipeline and a fourth pipeline; the inlet of the first pipeline is connected to the cold water outlet of the evaporator, the outlet of the first pipeline is connected to the first water inlet of the first four-way valve, the outlet of the second pipeline is connected to the cold water inlet of the evaporator, the inlet of the second pipeline is connected to the second water outlet of the second four-way valve, the inlet of the third pipeline is connected to the hot water outlet of the condenser, the outlet of the third pipeline is connected to the second water inlet of the first four-way valve, the outlet of the fourth pipeline is connected to the hot water inlet of the condenser, and the inlet of the fourth pipeline is connected to the first outlet of the second four-way valve. water inlet; the second water outlet of the first four-way valve is connected to the water inlet of the cooling unit, the water outlet of the cooling unit is connected to the water inlet of the motor group, and the water outlet of the motor group is connected to the first water inlet of the second four-way valve; the first water outlet of the first four-way valve is connected to the inlet end of the heat exchange unit, and the outlet end of the heat exchange unit is connected to the second water inlet of the second four-way valve; in the first state, the first water outlet of the first four-way valve is connected to the first water inlet of the first four-way valve, and the second water outlet of the second four-way valve is connected to the second water inlet of the second four-way valve; in the second state, the first water inlet of the first four-way valve is connected to the second water outlet of the first four-way valve, and the second water outlet of the second four-way valve is connected to the first water inlet of the second four-way valve.

[0010] In any of the above technical solutions, further, the indirect thermal management system also includes a first three-way valve; the water inlet of the first three-way valve is connected to the first water outlet of the first four-way valve, the second water outlet of the first three-way valve is connected to the inlet end of the heat exchange unit, and the outlet end of the heat exchange unit is connected to the second water inlet of the second four-way valve.

[0011] In any of the above technical solutions, further, the indirect thermal management system also includes a battery pack and a water-cooled heat exchanger; the first water inlet of the water-cooled heat exchanger is connected to the first water outlet of the first three-way valve, and the first water outlet of the water-cooled heat exchanger is connected to the second water inlet of the second four-way valve; the second water inlet of the water-cooled heat exchanger is connected to the water outlet of the battery pack, and the water inlet of the battery pack is connected to the second water outlet of the water-cooled heat exchanger.

[0012] In any of the above technical solutions, further, the indirect thermal management system also includes a second three-way valve, and the heat exchange unit includes a first heat exchanger and a second heat exchanger; the water inlet of the second three-way valve is connected to the second water outlet of the first three-way valve, the first water outlet of the second three-way valve is connected to the water inlet end of the first heat exchanger, the second water outlet of the second three-way valve is connected to the water inlet end of the second heat exchanger, and the water outlet ends of the first heat exchanger and the water outlet ends of the second heat exchanger are both connected to the second water inlet of the second four-way valve.

[0013] In any of the above technical solutions, further, the indirect thermal management system also includes a fourth three-way valve and a fifth three-way valve, and the fifth three-way valve is arranged in the third pipeline; the water inlet of the fourth three-way valve is connected to the water outlet of the first heat exchanger, the first water outlet of the fourth three-way valve is connected to the hot water inlet of the condenser, and the second water outlet of the fourth three-way valve is connected to the second water inlet of the second four-way valve; the water inlet of the fifth three-way valve is connected to the hot water outlet of the condenser, the first water outlet of the fifth three-way valve is connected to the second water inlet of the first four-way valve, and the second water outlet of the fifth three-way valve is connected to the water inlet of the first heat exchanger.

[0014] In any of the above technical solutions, further, the refrigerant circuit also includes a gas-liquid separator, a second solenoid valve and a third solenoid valve; the gas-liquid separator is arranged between the evaporator and the compressor, the second solenoid valve is arranged between the evaporator and the gas-liquid separator, and the third solenoid valve is arranged between the compressor and the gas-liquid separator; when the detected gas concentration value reaches a predetermined concentration value, the controller controls the first solenoid valve, the electronic expansion valve, the second solenoid valve and the third solenoid valve to close.

[0015] According to a second aspect of the present application, a vehicle is provided, comprising the indirect thermal management system as described above.

[0016] The indirect thermal management system of the present application includes a refrigerant circuit, a gas sensor and a controller. The refrigerant circuit and the gas sensor are both arranged in the front cabin of the car; the refrigerant circuit includes a compressor, a first solenoid valve, a condenser, an electronic expansion valve and an evaporator connected in sequence; the controller is pre-set with a predetermined concentration value; the gas sensor can detect the gas concentration and send the detected gas concentration value to the controller, and when the detected gas concentration value reaches the predetermined concentration value, the controller controls the first solenoid valve and the electronic expansion valve to close.

[0017] According to the above technical features, the beneficial effects of this application are:

[0018] In the refrigerant circuit of the present application, when the refrigerant leaks, the gas sensor can detect the refrigerant, and send the detected gas concentration value to the controller. When the detected gas concentration value reaches the preset concentration value, the controller controls the first solenoid valve and the electronic expansion valve to close (here, the preset concentration value can be 0 or greater than 0. When the preset concentration value is 0, that is, as long as the gas sensor detects the refrigerant, the controller controls the first solenoid valve and the electronic expansion valve to close). At this time, the first solenoid valve and the electronic expansion valve cut the refrigerant circuit into two sections of pipelines. In this way, the refrigerant in the pipeline without a leak point will not leak further, which can minimize the further leakage of the flammable and explosive refrigerant and limit the risk of leakage to individual components. In other words, the present application can ensure that the refrigerant in the system will not leak completely, reduce the possibility of accidents, and ensure the safety of people in the passenger compartment.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 An overall schematic diagram of an indirect thermal management system according to an embodiment of the present application is shown.

[0022] Icons: 1-refrigerant circuit; 1.1-compressor; 1.2-condenser; 1.3-electronic expansion valve; 1.4-evaporator; 1.5-gas-liquid separator; 1.6-first solenoid valve; 1.7-second solenoid valve; 1.8-third solenoid valve; 2-heat exchange unit; 2.1-first heat exchanger; 2.2-second heat exchanger; 2.3-second fan; 3-cooling unit; 3.1-first fan; 3.2-low-temperature radiator; 4.1-first water pump; 4.2-second water pump; 4.3-third water pump; 5.1-fifth three-way valve; 5.2-second three-way valve; 5.3-first three-way valve; 6.1-sixth three-way valve; 6.2-fourth three-way valve; 7.1-first four-way valve; 7.2-second four-way valve; 8.1-first expansion water tank; 8.2-second expansion water tank; 8.3-third expansion water tank; 9-motor unit; 10-water-cooled heat exchanger; 11-battery pack; 50-first pipeline; 20-second pipeline; 30-third pipeline; 40-fourth pipeline. DETAILED DESCRIPTION

[0023] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0024] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0025] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present 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, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] The first aspect of the present application provides an indirect thermal management system, thereby solving the problem that the existing air-conditioning system has no safety protection function, and when the refrigerant leaks, no effective measures can be taken. When the refrigerant leaks to a certain concentration, it may pose a threat to people and vehicles, and even cause an explosion.

[0029] The following will refer to Figure 1 The indirect thermal management system according to some embodiments of the present application is described in detail.

[0030] like Figure 1 As shown, the indirect thermal management system of the present application includes a refrigerant circuit 1, a gas sensor and a controller. The refrigerant circuit 1 and the gas sensor are both arranged in the front cabin of the car; the refrigerant circuit 1 includes a compressor 1.1, a first solenoid valve 1.6, a condenser 1.2, an electronic expansion valve 1.3 and an evaporator 1.4 connected in sequence; the controller is pre-set with a predetermined concentration value; the gas sensor can detect the gas concentration and send the detected gas concentration value to the controller. When the detected gas concentration value reaches the predetermined concentration value, the controller controls the first solenoid valve 1.6 and the electronic expansion valve 1.3 to close.

[0031] According to the above technical features, the beneficial effects of this application are:

[0032] In the refrigerant circuit 1 of the present application, when the refrigerant leaks, the gas sensor can detect the refrigerant, and send the detected gas concentration value to the controller. When the detected gas concentration value reaches the predetermined concentration value, the controller controls the first solenoid valve 1.6 and the electronic expansion valve 1.3 to close (here, the predetermined concentration value can be 0 or greater than 0. When the predetermined concentration value is 0, that is, as long as the gas sensor detects the refrigerant, the controller controls the first solenoid valve 1.6 and the electronic expansion valve 1.3 to close). At this time, the first solenoid valve 1.6 and the electronic expansion valve 1.3 cut the refrigerant circuit 1 into two sections of pipelines. In this way, the refrigerant in the pipeline without a leakage point will not leak further, which can minimize the further leakage of the flammable and explosive refrigerant and limit the risk of leakage to individual components. In other words, the present application can ensure that the refrigerant in the system will not leak completely, reduce the possibility of accidents, and ensure the safety of people in the passenger compartment.

[0033] Optionally, in an embodiment of the present application, Figure 1 As shown, the indirect thermal management system further includes a first cold water branch, a first hot water branch and a heat exchange unit 2. The refrigerant circuit 1 and the gas sensor are both arranged in the front cabin of the vehicle, and the heat exchange unit 2 is arranged in the passenger compartment of the vehicle, and the heat exchange unit 2 can exchange heat with the gas in the passenger compartment of the vehicle.

[0034] like Figure 1 As shown, the inlet of the first cold water branch is connected to the cold water outlet of the evaporator 1.4, and the outlet of the first cold water branch is connected to the cold water inlet of the evaporator 1.4. In the cooling state, the cold water in the first cold water branch can flow through the heat exchange unit 2; the inlet of the first hot water branch is connected to the hot water outlet of the condenser 1.2, and the outlet of the first hot water branch is connected to the hot water inlet of the condenser 1.2. In the heating state, the hot water in the first hot water branch can flow through the heat exchange unit 2.

[0035] Optionally, in an embodiment of the present application, Figure 1 As shown, the indirect thermal management system further includes a cooling unit 3 and a motor group 9. In the cooling state, the cold water in the first cold water branch can flow through the heat exchange unit 2, and the hot water in the first hot water branch can flow through the cooling unit 3 and the motor group 9 in sequence. In the heating state, the hot water in the first hot water branch can flow through the heat exchange unit 2, and the cold water in the first cold water branch can flow through the cooling unit 3 and the motor group 9 in sequence.

[0036] Optionally, in an embodiment of the present application, Figure 1 As shown, the indirect thermal management system further includes a first four-way valve 7.1 and a second four-way valve 7.2, the first cold water branch includes a first pipeline 50 and a second pipeline 20, and the first hot water branch includes a third pipeline 30 and a fourth pipeline 40.

[0037] like Figure 1 As shown, the inlet of the first pipeline 50 is connected to the cold water outlet of the evaporator 1.4, the outlet of the first pipeline 50 is connected to the first water inlet of the first four-way valve 7.1, the outlet of the second pipeline 20 is connected to the cold water inlet of the evaporator 1.4, the inlet of the second pipeline 20 is connected to the second water outlet of the second four-way valve 7.2, the inlet of the third pipeline 30 is connected to the hot water outlet of the condenser 1.2, the outlet of the third pipeline 30 is connected to the second water inlet of the first four-way valve 7.1, the outlet of the fourth pipeline 40 is connected to the hot water inlet of the condenser 1.2, and the inlet of the fourth pipeline 40 is connected to the first water outlet of the second four-way valve 7.2.

[0038] like Figure 1As shown, the second water outlet of the first four-way valve 7.1 is connected to the water inlet of the cooling unit 3, the water outlet of the cooling unit 3 is connected to the water inlet of the motor group 9, and the water outlet of the motor group 9 is connected to the first water inlet of the second four-way valve 7.2; the first water outlet of the first four-way valve 7.1 is connected to the inlet end of the heat exchange unit 2, and the outlet end of the heat exchange unit 2 is connected to the second water inlet of the second four-way valve 7.2; in the cooling state, the first water outlet of the first four-way valve 7.1 is connected to the first water inlet of the first four-way valve 7.1, and the second water outlet of the second four-way valve 7.2 is connected to the second water inlet of the second four-way valve 7.2; in the heating state, the first water inlet of the first four-way valve 7.1 is connected to the second water outlet of the first four-way valve 7.1, and the second water outlet of the second four-way valve 7.2 is connected to the first water inlet of the second four-way valve 7.2.

[0039] In the following, reference will be made to Figure 1 Describe the cooling and heating processes of the indirect thermal management system in detail.

[0040] Optionally, in an embodiment of the present application, Figure 1 As shown, the indirect thermal management system further includes a first three-way valve 5.3. The water inlet of the first three-way valve 5.3 is connected to the first water outlet of the first four-way valve 7.1, the second water outlet of the first three-way valve 5.3 is connected to the inlet end of the heat exchange unit 2, and the outlet end of the heat exchange unit 2 is connected to the second water inlet of the second four-way valve 7.2.

[0041] Furthermore, if Figure 1 As shown, the indirect thermal management system further includes a battery pack 11 and a water-cooled heat exchanger 10. The first water inlet of the water-cooled heat exchanger 10 is connected to the first water outlet of the first three-way valve 5.3, and the first water outlet of the water-cooled heat exchanger 10 is connected to the second water inlet of the second four-way valve 7.2; water flowing out of the second water outlet of the water-cooled heat exchanger 10 passes through the third expansion water tank 8.3, the third water pump 4.3 and the battery pack 11 in sequence, and flows back to the second water inlet of the water-cooled heat exchanger 10.

[0042] Furthermore, if Figure 1 As shown, the indirect thermal management system further includes a second three-way valve 5.2, and the heat exchange unit 2 includes a first heat exchanger 2.1 and a second heat exchanger 2.2. The water inlet of the second three-way valve 5.2 is connected to the second water outlet of the first three-way valve 5.3, the first water outlet of the second three-way valve 5.2 is connected to the water inlet end of the first heat exchanger 2.1, the second water outlet of the second three-way valve 5.2 is connected to the water inlet end of the second heat exchanger 2.2, and the water outlet end of the first heat exchanger 2.1 and the water outlet end of the second heat exchanger 2.2 are both connected to the second water inlet of the second four-way valve 7.2.

[0043] Furthermore, if Figure 1As shown, the indirect thermal management system further includes a fourth three-way valve 6.2 and a fifth three-way valve 5.1, and the fifth three-way valve 5.1 is arranged in the third pipeline 30. The water inlet of the fourth three-way valve 6.2 is connected to the water outlet of the first heat exchanger 2.1, the first water outlet of the fourth three-way valve 6.2 is connected to the hot water inlet of the condenser 1.2, and the second water outlet of the fourth three-way valve 6.2 is connected to the second water inlet of the second four-way valve 7.2; the water inlet of the fifth three-way valve 5.1 is connected to the hot water outlet of the condenser 1.2, the first water outlet of the fifth three-way valve 5.1 is connected to the second water inlet of the first four-way valve 7.1, and the second water outlet of the fifth three-way valve 5.1 is connected to the water inlet of the first heat exchanger 2.1.

[0044] It should be noted here that Figure 1 As shown, the openings on the left side of the first four-way valve 7.1 and the second four-way valve 7.2 are the first water inlet of the four-way valve, the openings on the right side are the second water inlet of the four-way valve, the openings on the upper side are the first water outlet of the four-way valve, and the openings on the lower side are the second water outlet of the four-way valve; the opening on the left side of the first three-way valve 5.3 is the water inlet, the opening on the right side is the first water outlet, and the opening on the lower side is the second water outlet; the opening on the upper side of the second three-way valve 5.2 is the water inlet, the opening on the left side is the first water outlet, and the opening on the lower side is the second water outlet; the opening on the upper side of the fourth three-way valve 6.2 is the water inlet, the opening on the left side is the first water outlet, and the opening on the lower side is the second water outlet; the opening on the lower side of the fifth three-way valve 5.1 is the water inlet, the opening on the left side is the first water outlet, and the opening on the right side is the second water outlet.

[0045] In the embodiment of the present application, the specific working mode principle is as follows:

[0046] Refrigeration principle:

[0047] The refrigerant circuit flows as follows: the high-temperature and high-pressure refrigerant coming out of the compressor 1.1 passes through the first solenoid valve 1.6 and enters the water-cooled condenser 1.2 to be cooled to a saturated state. After being throttled by the electronic expansion valve 1.3, it passes through the evaporator 1.4 to absorb heat and enters the gas-liquid separator 1.5 and then returns to the compressor 1.1, completing a complete cycle.

[0048] Flow direction of low-temperature water circuit: the low-temperature water coming out of the evaporator 1.4 is pressurized by the second water pump 4.2 and flows through the first four-way valve 7.1. Then, after the flow distribution by the first three-way valve 5.3, one path goes to the water through the water-cooled heat exchanger 10 to exchange heat with the water circuit of the battery pack 11. The other path of cold water is divided into two paths to the heat exchange unit 2, one path passes through the first heat exchanger 2.1, and the other path passes through the second heat exchanger 2.2 to cool the high-temperature air in the passenger compartment sent in by the second fan 2.3 to meet the cooling demand of the passenger compartment; the medium-temperature water flowing out of the heat exchange unit 2 is combined with the water flowing out of the water-cooled heat exchanger 10, passes through the four-way second four-way valve 7.2, and returns to the evaporator 1.4 through the first expansion water tank 8.1 to complete the cycle.

[0049] Flow direction of high-temperature water circuit: high-temperature water coming out of the water-cooled condenser 1.2 passes through the first water pump 4.1, passes through the fifth three-way valve 5.1 to the first four-way valve 7.1, and then flows to the sixth three-way valve 6.1 to the front-end cooling unit 3, and is cooled by the low-temperature radiator 3.2 (the first fan 3.1 accelerates the heat exchange of the low-temperature radiator 3.2), flows through the power heating components such as the motor group 9, passes through the second four-way valve 7.2 to the second expansion water tank 8.2, and then returns to the water-cooled condenser 1.2 to complete the cycle.

[0050] Heat pump heating and waste heat recovery principle:

[0051] The flow direction of the refrigerant circuit 1 is consistent with the refrigeration principle.

[0052] Flow direction of low-temperature water circuit: the low-temperature water coming out of the evaporator 1.4 is pressurized by the second water pump 4.2, flows through the first four-way valve 7.1 reversing valve, passes through the sixth three-way valve 6.1 to the front-end cooling unit 3, absorbs the heat of the low-temperature environment by the low-temperature radiator 3.2, and then further absorbs the waste heat from the power components such as the motor group 9, and then passes through the second four-way valve 7.2 to the first expansion water tank 8.1 and returns to the evaporator 1.4 to complete a cycle.

[0053] Flow direction of high-temperature water circuit: the high-temperature water coming out of the water-cooled condenser 1.2 passes through the first water pump 4.1, passes through the fifth three-way valve 5.1 to the fifth three-way valve 5.1, and then passes through the first three-way valve 5.3 for flow distribution, one way to the water-cooled heat exchanger 10 and the battery pack 11 water circuit for heat exchange, and the other hot water is divided into two ways by the second three-way valve 5.2 to the heat exchange unit 2, one way passes through the first heat exchanger 2.1, and the other way passes through the second heat exchanger 2.2 to heat the low-temperature air in the passenger compartment sent in by the second fan 2.3 to meet the heating needs of the passenger compartment; the medium-temperature water flowing out of the heat exchange unit 2 is combined with the water flowing out of the water-cooled heat exchanger 10, passes through the second four-way valve 7.2, and returns to the water-cooled condenser 1.2 through the second expansion water tank 8.2 to complete the cycle.

[0054] Dehumidification principle:

[0055] The flow direction of the refrigerant circuit is consistent with the refrigeration principle.

[0056] Flow direction of low-temperature water circuit: the low-temperature water from the evaporator 1.4 is pressurized by the second water pump 4.2 and flows through the first four-way valve 7.1, then passes through the first three-way valve 5.3 and the second three-way valve 5.2 to the second heat exchanger 2.2 to cool and dehumidify the cabin air, and then passes through the second four-way valve 7.2, passes through the first expansion water tank 8.1 and returns to the evaporator 1.4 to complete the cycle.

[0057] High-temperature water circuit flow direction: the high-temperature water coming out of the water-cooled condenser 1.2 is pressurized by the first water pump 4.1 and then passes through the fifth three-way valve 5.1 to the first heat exchanger 2.1 to heat the dehumidified air. The water after coming out passes through the fourth three-way valve 6.2 to the second expansion water tank 8.2 and then returns to the water-cooled condenser 1.2 to complete a cycle.

[0058] De-icing principle:

[0059] The flow direction of the refrigerant circuit is consistent with the refrigeration principle.

[0060] Flow direction of low-temperature water circuit: the low-temperature water from the evaporator 1.4 is pressurized by the second water pump 4.2 and flows through the first four-way valve 7.1, then passes through the first three-way valve 5.3 to enter the water-cooled heat exchanger 10 to absorb the heat of the water circuit of the battery pack 11, and then passes through the second four-way valve 7.2 to reverse to the first expansion water tank 8.1 and returns to the evaporator 1.4, completing the cycle.

[0061] Flow direction of high-temperature water circuit: the high-temperature water coming out of the water-cooled condenser 1.2 is pressurized by the first water pump 4.1, passes through the fifth three-way valve 5.1, and then changes direction to the first four-way valve 7.1, and then passes through the fourth three-way valve 6.2 to the front-end cooling unit 3. After de-icing the low-temperature radiator 3.2, it flows through the power components such as the motor group 9 for further heating, passes through the second four-way valve 7.2 to the second expansion water tank 8.2, and then returns to the water-cooled condenser 1.2 to complete the cycle.

[0062] In summary, in the refrigerant circuit of the present application, when the refrigerant leaks, the controller controls the first solenoid valve 1.6 and the electronic expansion valve 1.3 to close. At this time, the first solenoid valve 1.6 and the electronic expansion valve 1.3 cut the refrigerant circuit 1 into two sections of pipelines. In this way, the refrigerant in the pipeline without a leakage point will not leak further, which can minimize the further leakage of flammable and explosive refrigerant and limit the risk of leakage to individual components. In other words, the present application can ensure that the refrigerant in the system will not leak completely, reduce the possibility of accidents, and ensure the safety of people in the passenger compartment.

[0063] As an example, the solenoid valve may be a normally closed solenoid valve. When the refrigerant leaks, the controller controls the normally closed solenoid valve to be powered off (the entire vehicle may also be powered off), and the refrigerant circuit is separated.

[0064] Furthermore, in order to further reduce leakage, e.g. Figure 1As shown, the refrigerant circuit 1 also includes a gas-liquid separator 1.5, a second solenoid valve 1.7 and a third solenoid valve 1.8. The gas-liquid separator 1.5 is arranged between the evaporator 1.4 and the compressor 1.1, the second solenoid valve 1.7 is arranged between the evaporator 1.4 and the gas-liquid separator 1.5, and the third solenoid valve 1.8 is arranged between the compressor 1.1 and the gas-liquid separator 1.5; when the detected gas concentration value reaches the predetermined concentration value, the controller controls the first solenoid valve 1.6, the electronic expansion valve 1.3, the second solenoid valve 1.7 and the third solenoid valve 1.8 to close. That is, when the refrigerant leaks, the first solenoid valve 1.6, the electronic expansion valve 1.3, the second solenoid valve 1.7 and the third solenoid valve 1.8 cut the refrigerant circuit into multiple sections of pipelines, thereby further reducing leakage.

[0065] In addition, the refrigerant circuit of this application is simplified, and the refrigerant uses R290 (propane). R290 has a higher latent heat of vaporization, a smaller molecular weight, a higher working pressure and a working density, which can greatly reduce the amount of refrigerant in the vehicle heat pump air conditioning system, and is more in line with the principles of lightweight and compactness. Moreover, R290 refrigerant can improve the performance of the heat pump system under low temperature (-15°C) heating and broaden the applicable temperature range of the heat pump system (theoretically up to -30°C).

[0066] In addition, the present application adopts a completely indirect architecture design to achieve secondary heat exchange between antifreeze and air, thereby avoiding the placement of components containing refrigerant in the passenger compartment.

[0067] In addition, the present application uses a water-cooled heat exchanger to exchange heat with the battery pack, and controls the flow and flow rate of the battery pack water circuit through a water pump to achieve control of different temperature zones in the passenger compartment and the battery pack.

[0068] A second aspect of the present application provides a vehicle, comprising the indirect thermal management system as described above.

[0069] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. An indirect thermal management system, characterized in that: The indirect thermal management system includes a refrigerant circuit, a gas sensor and a controller; The refrigerant circuit and the gas sensor are both arranged in the front cabin of the vehicle; The refrigerant circuit includes a compressor, a first solenoid valve, a condenser, an electronic expansion valve and an evaporator connected in sequence; The controller is pre-set with a predetermined concentration value; The gas sensor can detect gas concentration and send the detected gas concentration value to the controller. When the detected gas concentration value reaches a predetermined concentration value, the controller controls the first solenoid valve and the electronic expansion valve to close.

2. The indirect thermal management system according to claim 1, characterized in that: The indirect thermal management system further includes a first cold water branch, a first hot water branch and a heat exchange unit; The refrigerant circuit and the gas sensor are both arranged in the front cabin of the vehicle, and the heat exchange unit is arranged in the passenger cabin of the vehicle, and the heat exchange unit can exchange heat with the gas in the passenger cabin of the vehicle; The inlet of the first cold water branch is connected to the cold water outlet of the evaporator, and the outlet of the first cold water branch is connected to the cold water inlet of the evaporator; In the first state, the cold water in the first cold water branch can flow through the heat exchange unit; The inlet of the first hot water branch is connected to the hot water outlet of the condenser, and the outlet of the first hot water branch is connected to the hot water inlet of the condenser; In the second state, the hot water in the first hot water branch can flow through the heat exchange unit.

3. The indirect thermal management system according to claim 2, characterized in that: The indirect thermal management system also includes a cooling unit and a motor group; In the first state, the hot water in the first hot water branch can flow through the cooling unit and the motor group in sequence; In the second state, the cold water in the first cold water branch flows through the cooling unit and the motor group in sequence.

4. The indirect thermal management system according to claim 3, characterized in that: The indirect thermal management system further includes a first four-way valve and a second four-way valve, the first cold water branch includes a first pipeline and a second pipeline, and the first hot water branch includes a third pipeline and a fourth pipeline; The inlet of the first pipeline is connected to the cold water outlet of the evaporator, the outlet of the first pipeline is connected to the first water inlet of the first four-way valve, the outlet of the second pipeline is connected to the cold water inlet of the evaporator, the inlet of the second pipeline is connected to the second water outlet of the second four-way valve, the inlet of the third pipeline is connected to the hot water outlet of the condenser, the outlet of the third pipeline is connected to the second water inlet of the first four-way valve, the outlet of the fourth pipeline is connected to the hot water inlet of the condenser, and the inlet of the fourth pipeline is connected to the first water outlet of the second four-way valve; The second water outlet of the first four-way valve is connected to the water inlet of the cooling unit, the water outlet of the cooling unit is connected to the water inlet of the motor group, and the water outlet of the motor group is connected to the first water inlet of the second four-way valve; The first water outlet of the first four-way valve is connected to the inlet end of the heat exchange unit, and the outlet end of the heat exchange unit is connected to the second water inlet of the second four-way valve; In the first state, the first water outlet of the first four-way valve is connected to the first water inlet of the first four-way valve, and the second water outlet of the second four-way valve is connected to the second water inlet of the second four-way valve; In the second state, the first water inlet of the first four-way valve is communicated with the second water outlet of the first four-way valve, and the second water outlet of the second four-way valve is communicated with the first water inlet of the second four-way valve.

5. The indirect thermal management system according to claim 4, characterized in that: The indirect thermal management system further includes a first three-way valve; The water inlet of the first three-way valve is connected to the first water outlet of the first four-way valve, the second water outlet of the first three-way valve is connected to the inlet end of the heat exchange unit, and the outlet end of the heat exchange unit is connected to the second water inlet of the second four-way valve.

6. The indirect thermal management system according to claim 5, characterized in that: The indirect thermal management system also includes a battery pack and a water-cooled heat exchanger; The first water inlet of the water-cooled heat exchanger is connected to the first water outlet of the first three-way valve, and the first water outlet of the water-cooled heat exchanger is connected to the second water inlet of the second four-way valve; The second water inlet of the water-cooled heat exchanger is connected to the water outlet of the battery pack, and the water inlet of the battery pack is connected to the second water outlet of the water-cooled heat exchanger.

7. The indirect thermal management system according to claim 6, characterized in that: The indirect thermal management system further comprises a second three-way valve, and the heat exchange unit comprises a first heat exchanger and a second heat exchanger; The water inlet of the second three-way valve is connected to the second water outlet of the first three-way valve, the first water outlet of the second three-way valve is connected to the water inlet of the first heat exchanger, the second water outlet of the second three-way valve is connected to the water inlet of the second heat exchanger, and the water outlets of the first heat exchanger and the second heat exchanger are both connected to the second water inlet of the second four-way valve.

8. The indirect thermal management system according to claim 7, characterized in that: The indirect thermal management system further includes a fourth three-way valve and a fifth three-way valve, wherein the fifth three-way valve is disposed in the third pipeline; The water inlet of the fourth three-way valve is connected to the water outlet of the first heat exchanger, the first water outlet of the fourth three-way valve is connected to the hot water inlet of the condenser, and the second water outlet of the fourth three-way valve is connected to the second water inlet of the second four-way valve; The water inlet of the fifth three-way valve is connected to the hot water outlet of the condenser, the first water outlet of the fifth three-way valve is connected to the second water inlet of the first four-way valve, and the second water outlet of the fifth three-way valve is connected to the water inlet end of the first heat exchanger.

9. The indirect thermal management system according to claim 1, characterized in that: The refrigerant circuit also includes a gas-liquid separator, a second solenoid valve and a third solenoid valve; The gas-liquid separator is arranged between the evaporator and the compressor, the second solenoid valve is arranged between the evaporator and the gas-liquid separator, and the third solenoid valve is arranged between the compressor and the gas-liquid separator; When the detected gas concentration value reaches a predetermined concentration value, the controller controls the first solenoid valve, the electronic expansion valve, the second solenoid valve and the third solenoid valve to be closed.

10. An automobile, characterized in that: The invention comprises an indirect thermal management system as claimed in any one of claims 1 to 9.

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