Ultralow-temperature heat pump air conditioning system and vehicle

Abstract

The invention relates to the technical field of vehicle air conditioners, and particularly discloses an ultralow-temperature heat pump air conditioning system and a vehicle. The ultralow-temperature heat pump air conditioning system comprises a compressor, a condenser, an evaporator, a battery heat exchanger, a gas-liquid separator, an outside-vehicle heat exchanger, a heat pipe, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a first expansion valve, a second expansion valve, a third expansion valve, a fourth expansion valve, a first heater and a second heater. The first heater is used for heating the refrigerant in the outside-vehicle heat exchanger, and the second heater is used for heating the refrigerant in the heat pipe. According to the ultralow-temperature heat pump air-conditioning system, a high-pressure water heating PTC heater is omitted, multiple heating modes such as a water source heat pump heating mode, a heat pipe heating mode, an out-vehicle heat exchanger heating mode and a hot gas bypass heat pump heating mode are achieved, the heating requirement of a passenger compartment under the ultralow-temperature working condition can be met, the whole vehicle cost and the system energy consumption are reduced, and the system energy consumption is reduced. And the heating modes are diversified, and various heating requirements of users can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle air conditioning, and in particular to an ultra-low temperature heat pump air conditioning system and a vehicle. Background Art

[0002] At present, the operating low temperature limit of the heat pump air-conditioning system of mainstream new energy vehicles on the market is generally around -10℃. When the ambient temperature is lower than -10℃, the suction density of the compressor decreases, and the heating capacity of the heat pump air-conditioning system decays sharply, which cannot meet the heating needs of the passenger compartment. Therefore, new energy vehicles currently generally use high-pressure water-heating PTC heaters for auxiliary heating under ultra-low temperature conditions, but the energy efficiency is low, the energy consumption is greatly increased, and the cruising range of new energy vehicles is seriously affected.

[0003] Therefore, it is urgent to propose an ultra-low temperature heat pump air-conditioning system and a vehicle to solve the above technical problems. Summary of the invention

[0004] According to one aspect of the present invention, there is provided an ultra-low temperature heat pump air conditioning system which, while eliminating the high-pressure water-heating PTC heater, can still meet the heating needs of the passenger compartment under ultra-low temperature conditions, thereby reducing the cost of the entire vehicle and the energy consumption of the system, and has a variety of heating modes to meet the various heating needs of users.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An ultra-low temperature heat pump air conditioning system is used for a vehicle, wherein the vehicle comprises a coolant circuit, and the ultra-low temperature heat pump air conditioning system comprises:

[0007] A compressor, a condenser, an evaporator, a battery heat exchanger, a gas-liquid separator, an off-vehicle heat exchanger, a heat pipe, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a first expansion valve, a second expansion valve, a third expansion valve, a fourth expansion valve, a first heater and a second heater, wherein the first heater is used to heat the refrigerant in the off-vehicle heat exchanger, and the second heater is used to heat the refrigerant in the heat pipe;

[0008] The outlet of the compressor is communicated with one end of the third solenoid valve, the other end of the third solenoid valve is communicated with the inlet of the condenser, the outlet of the condenser is communicated with one end of the first expansion valve, one end of the first expansion valve is also communicated with one end of the second expansion valve and one end of the fourth expansion valve, the other end of the second expansion valve is communicated with the inlet of the evaporator, the outlet of the evaporator is communicated with the inlet of the gas-liquid separator, the other end of the fourth expansion valve is communicated with the refrigerant inlet of the battery heat exchanger, the refrigerant outlet of the battery heat exchanger is communicated with the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is communicated with the inlet of the compressor, and the refrigerant in the battery heat exchanger exchanges heat with the coolant in the coolant circuit;

[0009] The outlet of the compressor is also communicated with one end of the third expansion valve, and the other end of the third expansion valve is communicated with the inlet of the gas-liquid separator;

[0010] The other end of the first expansion valve is communicated with the first port of the off-vehicle heat exchanger, the second port of the off-vehicle heat exchanger is communicated with one end of the first solenoid valve and one end of the second solenoid valve respectively, the other end of the first solenoid valve is communicated with the outlet of the compressor, and the other end of the second solenoid valve is communicated with the inlet of the gas-liquid separator;

[0011] The other end of the first expansion valve is also connected to the first port of the heat pipe, the second port of the heat pipe is connected to the inlet of the gas-liquid separator, and the fourth solenoid valve is arranged on the heat pipe to control the on and off of the heat pipe.

[0012] Optionally, in the water source heat pump heating mode, the first solenoid valve, the second solenoid valve, the fourth solenoid valve, the first expansion valve, the second expansion valve and the third expansion valve are all closed, and the third solenoid valve and the fourth expansion valve are both opened; the refrigerant discharged from the compressor flows through the third solenoid valve, the condenser, the fourth expansion valve, the battery heat exchanger and the gas-liquid separator in sequence and then returns to the compressor.

[0013] Optionally, in the heat pipe heating mode, the first solenoid valve, the second solenoid valve, the second expansion valve, the third expansion valve and the fourth expansion valve are all closed, and the third solenoid valve, the fourth solenoid valve and the first expansion valve are all opened; the refrigerant discharged from the compressor flows through the third solenoid valve, the condenser, the first expansion valve, the heat pipe, the fourth solenoid valve and the gas-liquid separator in sequence and then returns to the compressor.

[0014] Optionally, in the heating mode of the outdoor heat exchanger, the first solenoid valve, the fourth solenoid valve, the second expansion valve, the third expansion valve and the fourth expansion valve are all closed, and the second solenoid valve, the third solenoid valve and the first expansion valve are all opened; the refrigerant discharged from the compressor flows through the third solenoid valve, the condenser, the first expansion valve, the outdoor heat exchanger, the second solenoid valve, the gas-liquid separator in sequence and then returns to the compressor.

[0015] Optionally, in the hot gas bypass heat pump heating mode, the first solenoid valve, the second solenoid valve, the fourth solenoid valve, the first expansion valve and the second expansion valve are all closed, and the third solenoid valve, the third expansion valve and the fourth expansion valve are all opened; the refrigerant discharged from the compressor is divided into two branches, one branch flows through the third solenoid valve, the condenser, the fourth expansion valve, the battery heat exchanger and the gas-liquid separator in sequence and then returns to the compressor; the other branch flows through the third expansion valve and the gas-liquid separator in sequence and then returns to the compressor.

[0016] Optionally, the ultra-low temperature heat pump air-conditioning system further includes a one-way valve, the outlet of the condenser is connected to the inlet of the one-way valve, and the outlet of the one-way valve is connected to one end of the first expansion valve.

[0017] Optionally, a first temperature and pressure sensor is provided at the outlet of the compressor, and a second temperature and pressure sensor is provided at the inlet of the compressor.

[0018] Optionally, a third temperature and pressure sensor is provided between the first expansion valve and the second expansion valve.

[0019] Optionally, the first heater is integrated with the external heat exchanger; and / or the second heater is integrated with the heat pipe.

[0020] According to another aspect of the present invention, the present invention also provides a vehicle, comprising a vehicle body, a coolant circuit and an ultra-low temperature heat pump air-conditioning system as described in any of the above technical solutions, wherein the coolant circuit and the ultra-low temperature heat pump air-conditioning system are both arranged on the vehicle body.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides an ultra-low temperature heat pump air conditioning system, including a compressor, a condenser, an evaporator, a battery heat exchanger, a gas-liquid separator, an off-vehicle heat exchanger, a heat pipe, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a first expansion valve, a second expansion valve, a third expansion valve, a fourth expansion valve, a first heater and a second heater, wherein the first heater is used to heat the refrigerant in the off-vehicle heat exchanger, and the second heater is used to heat the refrigerant in the heat pipe. The ultra-low temperature heat pump air conditioning system can heat the refrigerant by controlling the opening and closing of the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the first expansion valve, the second expansion valve, the third expansion valve and the fourth expansion valve, and the heating mode is flexible and diverse, and can meet the heating needs of users at different temperatures. In addition, the ultra-low temperature heat pump air conditioning system cancels the high-pressure water heating PTC in the prior art, and uses the coolant circuit, the off-vehicle heat exchanger or the heat pipe to provide heat, which can not only meet the heating needs of the passenger compartment under ultra-low temperature conditions, but also reduce costs and system energy consumption.

[0023] The present invention also provides a vehicle, comprising a vehicle body, a coolant circuit and the ultra-low temperature heat pump air conditioning system. Due to the ultra-low temperature heat pump air conditioning system, the vehicle has low vehicle cost, low energy consumption and various heating modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of an ultra-low temperature heat pump air conditioning system provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of an ultra-low temperature heat pump air conditioning system provided by an embodiment of the present invention in a water source heat pump heating mode;

[0027] Figure 3 A schematic diagram of an ultra-low temperature heat pump air conditioning system provided by an embodiment of the present invention in a heat pipe heating mode;

[0028] Figure 4 A schematic diagram of an ultra-low temperature heat pump air conditioning system provided by an embodiment of the present invention in a heating mode of an external heat exchanger;

[0029] Figure 5 A schematic diagram of an ultra-low temperature heat pump air-conditioning system provided by an embodiment of the present invention in a hot gas bypass heat pump heating mode.

[0030] In the figure:

[0031] 1. Compressor; 2. Condenser; 3. Evaporator; 4. Battery heat exchanger; 5. Gas-liquid separator; 6. External heat exchanger; 7. Heat pipe; 8. First solenoid valve; 9. Second solenoid valve; 10. Third solenoid valve; 11. Fourth solenoid valve; 12. First expansion valve; 13. Second expansion valve; 14. Third expansion valve; 15. Fourth expansion valve; 16. First heater; 17. Second heater; 18. One-way valve; 19. First temperature and pressure sensor; 20. Second temperature and pressure sensor; 21. Third temperature and pressure sensor. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] This embodiment provides an ultra-low temperature heat pump air-conditioning system, which can still meet the heating needs of the passenger compartment under ultra-low temperature conditions while eliminating the high-pressure water-heating PTC heater, reducing the cost of the entire vehicle and the energy consumption of the system, and has a variety of heating modes to meet the user's various heating needs.

[0040] like Figure 1 As shown, the ultra-low temperature heat pump air conditioning system includes a compressor 1, a condenser 2, an evaporator 3, a battery heat exchanger 4, a gas-liquid separator 5, an external heat exchanger 6, a heat pipe 7, a first solenoid valve 8, a second solenoid valve 9, a third solenoid valve 10, a fourth solenoid valve 11, a first expansion valve 12, a second expansion valve 13, a third expansion valve 14, a fourth expansion valve 15, a first heater 16 and a second heater 17. The first heater 16 is used to heat the refrigerant in the external heat exchanger 6, and the second heater 17 is used to heat the refrigerant in the heat pipe 7.

[0041] Specifically, the connection relationship between the various components in the ultra-low temperature heat pump air conditioning system is as follows:

[0042] The outlet of the compressor 1 is communicated with one end of the third solenoid valve 10, the other end of the third solenoid valve 10 is communicated with the inlet of the condenser 2, the outlet of the condenser 2 is communicated with one end of the first expansion valve 12, one end of the first expansion valve 12 is also communicated with one end of the second expansion valve 13 and one end of the fourth expansion valve 15, the other end of the second expansion valve 13 is communicated with the inlet of the evaporator 3, the outlet of the evaporator 3 is communicated with the inlet of the gas-liquid separator 5, the other end of the fourth expansion valve 15 is communicated with the refrigerant inlet of the battery heat exchanger 4, the refrigerant outlet of the battery heat exchanger 4 is communicated with the inlet of the gas-liquid separator 5, the outlet of the gas-liquid separator 5 is communicated with the inlet of the compressor 1, and the refrigerant in the battery heat exchanger 4 exchanges heat with the coolant in the coolant circuit of the vehicle.

[0043] The outlet of the compressor 1 is also communicated with one end of the third expansion valve 14 , and the other end of the third expansion valve 14 is communicated with the inlet of the gas-liquid separator 5 .

[0044] The other end of the first expansion valve 12 is connected to the first port of the external heat exchanger 6, and the second port of the external heat exchanger 6 is respectively connected to one end of the first solenoid valve 8 and one end of the second solenoid valve 9, the other end of the first solenoid valve 8 is connected to the outlet of the compressor 1, and the other end of the second solenoid valve 9 is connected to the inlet of the gas-liquid separator 5.

[0045] The other end of the first expansion valve 12 is also connected to the first port of the heat pipe 7 , the second port of the heat pipe 7 is connected to the inlet of the gas-liquid separator 5 , and the fourth solenoid valve 11 is arranged on the heat pipe 7 to control the on and off of the heat pipe 7 .

[0046] The ultra-low temperature heat pump air conditioning system provided in this embodiment can heat the refrigerant by controlling the opening and closing of the first solenoid valve 8, the second solenoid valve 9, the third solenoid valve 10, the fourth solenoid valve 11, the first expansion valve 12, the second expansion valve 13, the third expansion valve 14 and the fourth expansion valve 15. The heating mode is flexible and diverse, and can meet the heating needs of users at different temperatures. In addition, the ultra-low temperature heat pump air conditioning system cancels the high-pressure water heating PTC in the prior art, and uses the coolant circuit, the external heat exchanger 6 or the heat pipe 7 to provide heat, which can not only meet the heating needs of the passenger compartment under ultra-low temperature conditions, but also reduce costs and system energy consumption.

[0047] It is worth noting that the ultra-low temperature heat pump air conditioning system provided in this embodiment can switch between multiple modes such as cooling mode, heating mode, dehumidification mode, and defrosting mode by controlling the opening and closing of the first solenoid valve 8, the second solenoid valve 9, the third solenoid valve 10, the fourth solenoid valve 11, the first expansion valve 12, the second expansion valve 13, the third expansion valve 14, and the fourth expansion valve 15. This embodiment mainly protects the heating mode, so other working modes are not described in detail.

[0048] It is worth mentioning that the ultra-low temperature heat pump air-conditioning system is suitable for an ultra-low temperature environment of -25°C.

[0049] Furthermore, in the present embodiment, the heating modes of the ultra-low temperature heat pump air-conditioning system are divided into the following types according to the differences in heat sources: water source heat pump heating mode, heat pipe heating mode, external heat exchanger heating mode and hot gas bypass heat pump heating mode. The above four heating modes can be used for heating individually or in combination, and can be set according to the ambient temperature and the heat demand of the passenger compartment.

[0050] Figure 2 A schematic diagram of the ultra-low temperature heat pump air-conditioning system provided for this embodiment when in a water source heat pump heating mode (the solid line in the figure represents refrigerant flowing, and the dotted line represents no refrigerant flowing). In the water source heat pump heating mode, the first solenoid valve 8, the second solenoid valve 9, the fourth solenoid valve 11, the first expansion valve 12, the second expansion valve 13 and the third expansion valve 14 are all closed, and the third solenoid valve 10 and the fourth expansion valve 15 are both open.

[0051] At this time, the compressor 1 is working, and the high-temperature and high-pressure gaseous refrigerant is discharged from the outlet of the compressor 1, enters the condenser 2 through the third solenoid valve 10, condenses and releases heat in the condenser 2, and then enters the battery heat exchanger 4 through the fourth expansion valve 15. In the battery heat exchanger 4, heat is exchanged with the coolant circuit to increase the temperature. The heated refrigerant enters the gas-liquid separator 5 for gas-liquid separation, and the separated gaseous refrigerant flows back to the compressor 1, forming a circulating heating circuit of the refrigerant.

[0052] In the water source heat pump heating mode, the waste heat of the load (battery, motor, etc.) in the coolant circuit can be recovered through the battery heat exchanger 4, which improves the energy utilization efficiency of the system and helps to reduce the energy consumption of the system.

[0053] Figure 3 A schematic diagram of the ultra-low temperature heat pump air-conditioning system provided for this embodiment when in a heat pipe heating mode (the solid line in the figure represents refrigerant flowing through, and the dotted line represents no refrigerant flowing through). In the heat pipe heating mode, the first solenoid valve 8, the second solenoid valve 9, the second expansion valve 13, the third expansion valve 14 and the fourth expansion valve 15 are all closed, and the third solenoid valve 10, the fourth solenoid valve 11 and the first expansion valve 12 are all open.

[0054] At this time, the compressor 1 is working, and the high-temperature and high-pressure gaseous refrigerant is discharged from the outlet of the compressor 1, enters the condenser 2 through the third solenoid valve 10, condenses and releases heat in the condenser 2, and then enters the heat pipe 7 through the first expansion valve 12. In the heat pipe 7, the refrigerant is heated by the second heater 17. The heated refrigerant enters the gas-liquid separator 5 for gas-liquid separation, and the separated gaseous refrigerant flows back into the compressor 1, forming a circulating heating circuit of the refrigerant.

[0055] Optionally, the second heater 17 may be a PTC heater.

[0056] Optionally, the second heater 17 can be integrated with the heat pipe 7 to facilitate assembly of the ultra-low temperature heat pump air-conditioning system.

[0057] Figure 4 A schematic diagram of the ultra-low temperature heat pump air-conditioning system provided in this embodiment when it is in the outdoor heat exchanger heating mode (the solid line in the figure represents the flow of refrigerant, and the dotted line represents the flow of no refrigerant). In the outdoor heat exchanger heating mode, the first solenoid valve 8, the fourth solenoid valve 11, the second expansion valve 13, the third expansion valve 14 and the fourth expansion valve 15 are all closed, and the second solenoid valve 9, the third solenoid valve 10 and the first expansion valve 12 are all open.

[0058] At this time, the compressor 1 is working, and the high-temperature and high-pressure gaseous refrigerant is discharged from the outlet of the compressor 1, enters the condenser 2 through the third solenoid valve 10, and enters the external heat exchanger 6 through the first expansion valve 12 after condensation and heat release in the condenser 2. In the external heat exchanger 6, the refrigerant is heated by the first heater 16. The heated refrigerant enters the gas-liquid separator 5 through the second solenoid valve 9 for gas-liquid separation. The separated gaseous refrigerant flows back to the compressor 1, forming a circulating heating circuit of the refrigerant.

[0059] Optionally, the first heater 16 may be a PTC heater.

[0060] Optionally, the first heater 16 can be integrated with the external heat exchanger 6 to facilitate assembly of the ultra-low temperature heat pump air-conditioning system.

[0061] Optionally, a grille may be provided on the external heat exchanger 6 to facilitate heat preservation in winter and heat dissipation in summer.

[0062] Optionally, a fan may be provided at the external heat exchanger 6 for heat dissipation.

[0063] Figure 5 A schematic diagram of the ultra-low temperature heat pump air-conditioning system provided in this embodiment when in a hot gas bypass heat pump heating mode (the solid line in the figure represents refrigerant flowing, and the dotted line represents no refrigerant flowing). In the hot gas bypass heat pump heating mode, the first solenoid valve 8, the second solenoid valve 9, the fourth solenoid valve 11, the first expansion valve 12 and the second expansion valve 13 are all closed, and the third solenoid valve 10, the third expansion valve 14 and the fourth expansion valve 15 are all open.

[0064] At this time, the compressor 1 is working, and the high-temperature and high-pressure gaseous refrigerant is discharged from the outlet of the compressor 1 and is divided into two branches. One branch passes through the third solenoid valve 10 to enter the condenser 2, and after condensation and heat release in the condenser 2, it passes through the fourth expansion valve 15 to enter the battery heat exchanger 4, and heat is exchanged with the coolant circuit in the battery heat exchanger 4 to increase the temperature. The heated refrigerant enters the gas-liquid separator 5 for gas-liquid separation, and the separated gaseous refrigerant flows back to the compressor 1, forming a circulating heating circuit of the refrigerant. The other branch passes through the third expansion valve 14 to enter the gas-liquid separator 5 for gas-liquid separation, and the separated gaseous refrigerant flows back to the compressor 1.

[0065] In the hot gas bypass heat pump heating mode, the other branch is the bypass branch. By opening the bypass branch, the total heat released by the condenser 2 can be reduced, thereby achieving the purpose of temperature control.

[0066] Further, see Figure 1 The ultra-low temperature heat pump air conditioning system further includes a one-way valve 18, the outlet of the condenser 2 is connected to the inlet of the one-way valve 18, and the outlet of the one-way valve 18 is connected to one end of the first expansion valve 12. By providing the one-way valve 18, the refrigerant can be prevented from flowing back into the condenser 2.

[0067] It is worth noting that the function of the one-way valve 18 is mainly reflected in other working modes, such as the cooling mode.

[0068] Furthermore, a first temperature and pressure sensor 19 is provided at the outlet of the compressor 1, and a second temperature and pressure sensor 20 is provided at the inlet of the compressor 1. Through the first temperature and pressure sensor 19 and the second temperature and pressure sensor 20, the temperature and pressure of the inlet and outlet of the compressor 1 can be detected, so as to understand the working condition of the compressor 1.

[0069] Optionally, a third temperature and pressure sensor 21 may be provided between the first expansion valve 12 and the second expansion valve 13. The third temperature and pressure sensor 21 can detect the temperature and pressure of the inlet of the evaporator 3.

[0070] The provision of the first temperature and pressure sensor 19, the second temperature and pressure sensor 20 and the third temperature and pressure sensor 21 facilitates the intelligent detection of the ultra-low temperature heat pump air-conditioning system.

[0071] This embodiment also provides a vehicle, including a vehicle body, a coolant circuit and the above-mentioned ultra-low temperature heat pump air-conditioning system, wherein the coolant circuit and the ultra-low temperature heat pump air-conditioning system are both arranged on the vehicle body.

[0072] Since the vehicle adopts the above-mentioned ultra-low temperature heat pump air-conditioning system, the vehicle has low overall cost, low energy consumption, and various heating modes.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An ultra-low temperature heat pump air conditioning system for a vehicle, the vehicle comprising a coolant circuit, characterized in that: The ultra-low temperature heat pump air conditioning system comprises: A compressor (1), a condenser (2), an evaporator (3), a battery heat exchanger (4), a gas-liquid separator (5), an off-vehicle heat exchanger (6), a heat pipe (7), a first solenoid valve (8), a second solenoid valve (9), a third solenoid valve (10), a fourth solenoid valve (11), a first expansion valve (12), a second expansion valve (13), a third expansion valve (14), a fourth expansion valve (15), a first heater (16) and a second heater (17), wherein the first heater (16) is used for heating the refrigerant in the off-vehicle heat exchanger (6), and the second heater (17) is used for heating the refrigerant in the heat pipe (7); The outlet of the compressor (1) is communicated with one end of the third solenoid valve (10), the other end of the third solenoid valve (10) is communicated with the inlet of the condenser (2), the outlet of the condenser (2) is communicated with one end of the first expansion valve (12), one end of the first expansion valve (12) is also communicated with one end of the second expansion valve (13) and one end of the fourth expansion valve (15), the other end of the second expansion valve (13) is communicated with the inlet of the evaporator (3), the outlet of the evaporator (3) is communicated with the inlet of the gas-liquid separator (5), the other end of the fourth expansion valve (15) is communicated with the refrigerant inlet of the battery heat exchanger (4), the refrigerant outlet of the battery heat exchanger (4) is communicated with the inlet of the gas-liquid separator (5), the outlet of the gas-liquid separator (5) is communicated with the inlet of the compressor (1), and the refrigerant in the battery heat exchanger (4) exchanges heat with the coolant in the coolant circuit; The outlet of the compressor (1) is also connected to one end of the third expansion valve (14), and the other end of the third expansion valve (14) is connected to the inlet of the gas-liquid separator (5); The other end of the first expansion valve (12) is in communication with a first port of the off-board heat exchanger (6), the second port of the off-board heat exchanger (6) is in communication with one end of the first solenoid valve (8) and one end of the second solenoid valve (9), respectively, the other end of the first solenoid valve (8) is in communication with an outlet of the compressor (1), and the other end of the second solenoid valve (9) is in communication with an inlet of the gas-liquid separator (5); The other end of the first expansion valve (12) is also connected to the first port of the heat pipe (7), and the second port of the heat pipe (7) is connected to the inlet of the gas-liquid separator (5). The fourth solenoid valve (11) is arranged on the heat pipe (7) and is used to control the on and off of the heat pipe (7).

2. The ultra-low temperature heat pump air conditioning system according to claim 1, characterized in that: In the water source heat pump heating mode, the first solenoid valve (8), the second solenoid valve (9), the fourth solenoid valve (11), the first expansion valve (12), the second expansion valve (13) and the third expansion valve (14) are all closed, and the third solenoid valve (10) and the fourth expansion valve (15) are both opened; The refrigerant discharged from the compressor (1) flows through the third solenoid valve (10), the condenser (2), the fourth expansion valve (15), the battery heat exchanger (4) and the gas-liquid separator (5) in sequence and then returns to the compressor (1).

3. The ultra-low temperature heat pump air conditioning system according to claim 1, characterized in that: In the heat pipe heating mode, the first solenoid valve (8), the second solenoid valve (9), the second expansion valve (13), the third expansion valve (14) and the fourth expansion valve (15) are all closed, and the third solenoid valve (10), the fourth solenoid valve (11) and the first expansion valve (12) are all opened; The refrigerant discharged from the compressor (1) flows through the third solenoid valve (10), the condenser (2), the first expansion valve (12), the heat pipe (7), the fourth solenoid valve (11) and the gas-liquid separator (5) in sequence and then returns to the compressor (1).

4. The ultra-low temperature heat pump air conditioning system according to claim 1, characterized in that: In the heating mode of the off-board heat exchanger, the first solenoid valve (8), the fourth solenoid valve (11), the second expansion valve (13), the third expansion valve (14) and the fourth expansion valve (15) are all closed, and the second solenoid valve (9), the third solenoid valve (10) and the first expansion valve (12) are all opened; The refrigerant discharged from the compressor (1) flows sequentially through the third solenoid valve (10), the condenser (2), the first expansion valve (12), the off-board heat exchanger (6), the second solenoid valve (9), the gas-liquid separator (5), and then returns to the compressor (1).

5. The ultra-low temperature heat pump air conditioning system according to claim 1, characterized in that: In the hot gas bypass heat pump heating mode, the first solenoid valve (8), the second solenoid valve (9), the fourth solenoid valve (11), the first expansion valve (12) and the second expansion valve (13) are all closed, and the third solenoid valve (10), the third expansion valve (14) and the fourth expansion valve (15) are all opened; The refrigerant discharged from the compressor (1) is divided into two branches, one branch flows through the third solenoid valve (10), the condenser (2), the fourth expansion valve (15), the battery heat exchanger (4) and the gas-liquid separator (5) in sequence and then returns to the compressor (1); the other branch flows through the third expansion valve (14) and the gas-liquid separator (5) in sequence and then returns to the compressor (1).

6. The ultra-low temperature heat pump air conditioning system according to claim 1, characterized in that: The ultra-low temperature heat pump air conditioning system further comprises a one-way valve (18), the outlet of the condenser (2) is connected to the inlet of the one-way valve (18), and the outlet of the one-way valve (18) is connected to one end of the first expansion valve (12).

7. The ultra-low temperature heat pump air conditioning system according to claim 1, characterized in that: A first temperature and pressure sensor (19) is provided at the outlet of the compressor (1), and a second temperature and pressure sensor (20) is provided at the inlet of the compressor (1).

8. The ultra-low temperature heat pump air conditioning system according to claim 7, characterized in that: A third temperature and pressure sensor (21) is provided between the first expansion valve (12) and the second expansion valve (13).

9. The ultra-low temperature heat pump air conditioning system according to claim 1, characterized in that: The first heater (16) is integrated with the off-vehicle heat exchanger (6); and / or the second heater (17) is integrated with the heat pipe (7).

10. A vehicle, characterized in that It comprises a vehicle body, a coolant circuit and the ultra-low temperature heat pump air conditioning system according to any one of claims 1 to 9, wherein the coolant circuit and the ultra-low temperature heat pump air conditioning system are both arranged on the vehicle body.

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