Air conditioner and water heater combined system for vehicle

Abstract

The utility model belongs to the technical field of motor caravan, and discloses a vehicle air conditioner and water heater combined system which comprises a refrigerant circulation loop, an anti-freezing solution circulation loop and a water circulation loop. The refrigerant circulation loop comprises a compressor, a water cooling condenser, an outdoor heat exchanger, an evaporator, a first expansion valve, a second expansion valve, a first stop valve and a second stop valve, and the flow direction of a refrigerant in the refrigerant circulation loop is changed by selectively opening and closing the first expansion valve, the second expansion valve, the first stop valve and the second stop valve; therefore, the working modes of the vehicle air conditioner and water heater combined system are switched. The anti-freezing solution circulation loop comprises a water-cooling condenser and a heat exchanger, and anti-freezing solution sequentially flows through the water-cooling condenser and the heat exchanger. The water circulation loop comprises a cold water inlet, a heat exchanger and a hot water outlet, and water needs to flow through the cold water inlet, the heat exchanger and the hot water outlet in sequence. The air conditioner and water heater combined system for the vehicle is compact in structure, convenient to use and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of recreational vehicle technology, and in particular to a vehicle air conditioning and water heater combined system. Background Technology

[0002] A motorhome is a mobile vehicle that integrates living and travel functions, typically equipped with amenities such as air conditioning and water heaters, suitable for long-distance travel or camping. Currently, the air conditioning system and water heater in motorhomes are separate units. The air conditioning system uses refrigerant circulation for cooling, while the water heater can be fuel-fired, gas-fired, electric, fuel-fired electric, or gas-fired electric. However, fuel-fired and gas-fired water heaters require carrying fuel, and the limited space in motorhomes restricts the amount of liquid or gaseous fuel that can be carried, making refueling difficult when camping in the wild. Electric water heaters also require electricity for air conditioning, resulting in high overall electricity consumption and costs. While fuel-fired and gas-fired electric water heaters utilize only a portion of fuel, this is still insufficient, and the additional electricity used for the remaining portion is still relatively expensive.

[0003] Therefore, there is an urgent need to propose a combined vehicle air conditioning and water heater system to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a vehicle air conditioning and water heater combined system. This vehicle air conditioning and water heater combined system integrates air conditioning and water heater into one compact structure; it can select different working modes as needed, making it convenient to use; it can also use the heat released by the air conditioning to heat the water to be used, resulting in low energy consumption and low cost; and it can use the air conditioning principle to realize the hot water mode, increasing the heating source for the water to be used, thereby improving the convenience of heating the water to be used.

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

[0006] The vehicle air conditioning and water heater combined system includes:

[0007] A refrigerant circulation loop includes a compressor, a water-cooled condenser, an outdoor heat exchanger, an evaporator, a first expansion valve, a second expansion valve, a first shut-off valve, and a second shut-off valve. The compressor, the water-cooled condenser, the first expansion valve, the outdoor heat exchanger, the second expansion valve, and the evaporator are connected in sequence. The first expansion valve and the first shut-off valve are connected in parallel. The evaporator and the second expansion valve are connected in parallel with the second shut-off valve. By selectively opening and closing the first expansion valve, the second expansion valve, the first shut-off valve, and the second shut-off valve, the flow direction of the refrigerant in the refrigerant circulation loop is changed to switch the operating mode of the vehicle air conditioning water heater combined system.

[0008] An antifreeze circulation loop, comprising a water-cooled condenser and a heat exchanger, wherein antifreeze flows sequentially through the water-cooled condenser and the heat exchanger;

[0009] A water circulation loop includes a cold water inlet, a heat exchanger, and a hot water outlet, through which water flows sequentially.

[0010] As an optional technical solution for a combined vehicle air conditioning and water heater system, in the refrigerant circulation loop, the first shut-off valve and the second expansion valve are open, and the second shut-off valve and the first expansion valve are closed. The refrigerant flows sequentially through the compressor, the water-cooled condenser, the first shut-off valve, the outdoor heat exchanger, the second expansion valve, and the evaporator, and returns to the compressor. The antifreeze circulation loop and the water circulation loop are both closed.

[0011] As an optional technical solution for a combined vehicle air conditioning and water heater system, in the refrigerant circulation loop, the first expansion valve and the second shut-off valve are open, and the first shut-off valve and the second expansion valve are closed. The refrigerant flows sequentially through the compressor, the water-cooled condenser, the first expansion valve, the outdoor heat exchanger, and the second shut-off valve, and returns to the compressor.

[0012] In the antifreeze circulation loop, the antifreeze exchanges heat with the refrigerant in the water-cooled condenser;

[0013] In the water circulation loop, the water to be used exchanges heat with the antifreeze in the heat exchanger.

[0014] As an optional technical solution for a combined vehicle air conditioning and water heater system, in the refrigerant circulation loop, the first shut-off valve and the second expansion valve are open, and the second shut-off valve and the first expansion valve are closed. The refrigerant flows sequentially through the compressor, the water-cooled condenser, the first shut-off valve, the outdoor heat exchanger, the second expansion valve, and the evaporator, and returns to the compressor.

[0015] In the antifreeze circulation loop, the antifreeze exchanges heat with the refrigerant in the water-cooled condenser;

[0016] In the water circulation loop, the water to be used exchanges heat with the antifreeze in the heat exchanger.

[0017] As an optional technical solution for a combined vehicle air conditioning and water heater system, the refrigerant circulation loop further includes a gas-liquid separator, which is located at the refrigerant inlet of the compressor.

[0018] As an optional technical solution for a combined vehicle air conditioning and water heater system, the refrigerant circulation loop also includes a one-way valve, which is located at the refrigerant outlet of the evaporator.

[0019] As an optional technical solution for a combined vehicle air conditioning and water heater system, the antifreeze circulation loop also includes a fuel heater, which is located between the water-cooled condenser and the heat exchanger.

[0020] As an optional technical solution for a combined vehicle air conditioning and water heater system, the water circulation loop also includes a gas heater, which is connected in parallel with the heat exchanger.

[0021] As an optional technical solution for a combined vehicle air conditioning and water heater system, the antifreeze circulation loop also includes a first water pump, which is located between the water-cooled condenser and the heat exchanger.

[0022] As an optional technical solution for a combined vehicle air conditioning and water heater system, the water circulation loop further includes a second water pump, which is located between the cold water inlet and the heat exchanger.

[0023] The beneficial effects of this utility model are:

[0024] This utility model provides a combined vehicle air conditioning and water heater system, comprising a refrigerant circulation loop, an antifreeze circulation loop, and a water circulation loop. The refrigerant circulation loop includes a compressor, a water-cooled condenser, an outdoor heat exchanger, an evaporator, a first expansion valve, a second expansion valve, a first shut-off valve, and a second shut-off valve. The antifreeze circulation loop includes a water-cooled condenser and a heat exchanger. The water circulation loop includes a cold water inlet, a heat exchanger, and a hot water outlet. By selectively opening and closing the first expansion valve, the second expansion valve, the first shut-off valve, and the second shut-off valve, the flow direction of the refrigerant in the refrigerant circulation loop is changed, thereby switching the operating mode of the combined vehicle air conditioning and water heater system to meet the user's needs for cooling only, hot water only, or both simultaneously. In practical applications, if a user needs air conditioning cooling but not hot water, the vehicle's air conditioning and water heater combined system operates in air conditioning cooling mode. In this mode, both the antifreeze and water circulation loops are closed, and the refrigerant in the refrigerant circulation loop circulates for cooling. If the user needs hot water but not air conditioning cooling, the system operates in hot water mode. In this mode, the refrigerant in the refrigerant circulation loop heats the antifreeze in the antifreeze circulation loop, and the antifreeze is then used to heat the water needed, thus achieving hot water mode using the air conditioning principle and increasing the heating source for the water. If the user needs both hot water and air conditioning cooling, the system operates in air conditioning cooling + hot water mode. In this mode, the refrigerant in the refrigerant circulation loop circulates for cooling, and the antifreeze in the antifreeze circulation loop absorbs the heat released by the water-cooled condenser in the refrigerant circulation loop, and the heat-absorbing antifreeze then heats the water needed. Therefore, this vehicle air conditioning and water heater combined system integrates air conditioning and water heating into one compact structure; it can select different working modes as needed, making it convenient to use; it can also use the heat released by the air conditioning to heat the water needed, thereby reducing the energy consumption of the entire vehicle air conditioning and water heater combined system and saving costs; and it can use the air conditioning principle to realize the hot water mode, increasing the heating source for the water needed, thereby improving the convenience of heating the water needed. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the combined vehicle air conditioner and water heater system provided in this embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the vehicle air conditioner and water heater combined system provided in this embodiment of the utility model in air conditioning cooling mode;

[0027] Figure 3 This is a schematic diagram of the vehicle air conditioner and water heater combined system provided in this embodiment of the present invention in hot water mode;

[0028] Figure 4 This is a schematic diagram of the vehicle air conditioner and water heater combined system provided in this embodiment of the utility model in the air conditioning cooling + hot water mode.

[0029] In the picture:

[0030] 1. Compressor; 2. Water-cooled condenser; 3. Outdoor heat exchanger; 4. Evaporator; 5. First expansion valve; 6. Second expansion valve; 7. First shut-off valve; 8. Second shut-off valve; 9. Gas-liquid separator; 10. Check valve; 11. Heat exchanger; 12. First water pump; 13. Second water pump; 14. Fuel oil heater; 15. Gas heater; 16. Cold water inlet; 17. Hot water outlet. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] This embodiment provides a vehicle air conditioning and water heater combined system, which integrates air conditioning and water heater into one compact structure; it can select different working modes as needed, making it convenient to use; it can also use the heat released by the air conditioning to heat the water to be used, resulting in low energy consumption and low cost; and it can use the air conditioning principle to realize a hot water mode, increasing the heating source for the water to be used, thereby improving the convenience of heating the water to be used.

[0036] Specifically, such as Figure 1 As shown, the vehicle air conditioning and water heater combined system includes a refrigerant circulation loop, an antifreeze circulation loop, and a water circulation loop, which are circled sequentially from right to left by the dashed boxes in the figure. The refrigerant circulation loop includes a compressor 1, a water-cooled condenser 2, an outdoor heat exchanger 3, an evaporator 4, a first expansion valve 5, a second expansion valve 6, a first shut-off valve 7, and a second shut-off valve 8. The compressor 1, water-cooled condenser 2, first expansion valve 5, outdoor heat exchanger 3, second expansion valve 6, and evaporator 4 are connected sequentially. The first expansion valve 5 is connected in parallel with the first shut-off valve 7, and the evaporator 4 and second expansion valve 6 are connected in parallel with the second shut-off valve 8. By selectively opening and closing the first expansion valve 5, second expansion valve 6, first shut-off valve 7, and second shut-off valve 8, the flow direction of the refrigerant in the refrigerant circulation loop is changed, thereby switching the operating mode of the vehicle air conditioning and water heater combined system. The antifreeze circulation loop includes a water-cooled condenser 2 and a heat exchanger 11, through which the antifreeze flows sequentially. The water circulation loop includes a cold water inlet 16, a heat exchanger 11, and a hot water outlet 17. Water needs to flow through the cold water inlet 16, the heat exchanger 11, and the hot water outlet 17 in sequence.

[0037] Based on the above design, by selectively opening and closing the first expansion valve 5, the second expansion valve 6, the first shut-off valve 7, and the second shut-off valve 8, the flow direction of the refrigerant in the refrigerant circulation loop is changed, thereby switching the working mode of the vehicle air conditioning water heater combined system to meet the user's needs for only cooling, only hot water, or both cooling and hot water at the same time. In practical applications, if a user needs air conditioning cooling but not hot water, the vehicle's air conditioning and water heater combined system operates in air conditioning cooling mode. In this mode, both the antifreeze circulation loop and the water circulation loop are closed, and the refrigerant in the refrigerant circulation loop circulates for cooling. If the user needs hot water but not air conditioning cooling, the system operates in hot water mode. In this mode, the refrigerant in the refrigerant circulation loop heats the antifreeze in the antifreeze circulation loop, and the antifreeze is then used to heat the water needed, thus achieving hot water mode using the air conditioning principle and increasing the heating source for the water. If the user needs both hot water and air conditioning cooling, the system operates in air conditioning cooling + hot water mode. In this mode, the refrigerant in the refrigerant circulation loop circulates for cooling, and the antifreeze in the antifreeze circulation loop absorbs the heat released by the water-cooled condenser 2 in the refrigerant circulation loop, and the heat-absorbing antifreeze then heats the water needed. Therefore, this vehicle air conditioning and water heater combined system integrates air conditioning and water heating into one compact structure; it can select different working modes as needed, making it convenient to use; it can also use the heat released by the air conditioning to heat the water needed, thereby reducing the energy consumption of the entire vehicle air conditioning and water heater combined system and saving costs; and it can use the air conditioning principle to realize the hot water mode, increasing the heating source for the water needed, thereby improving the convenience of heating the water needed.

[0038] In this embodiment, a fan is provided at the outdoor heat exchanger 3 to improve the heat exchange efficiency of the outdoor heat exchanger 3.

[0039] like Figure 2As shown, in the air conditioning cooling mode, the refrigerant circulation loop of this vehicle air conditioning and water heater combined system has the first shut-off valve 7 and the second expansion valve 6 open, while the second shut-off valve 8 and the first expansion valve 5 are closed. The refrigerant flows sequentially through the compressor 1, water-cooled condenser 2, first shut-off valve 7, outdoor heat exchanger 3, second expansion valve 6, and evaporator 4, returning to the compressor 1. The antifreeze circulation loop and the water circulation loop are both closed. The refrigerant is compressed in the compressor 1 into a high-temperature, high-pressure gaseous refrigerant. The gaseous refrigerant passes sequentially through the water-cooled condenser 2 and the first shut-off valve 7 into the outdoor heat exchanger 3. In the outdoor heat exchanger 3, the gaseous refrigerant condenses and dissipates heat (releasing heat to the outside of the vehicle) into a liquid refrigerant. Then, it passes through the second expansion valve 6 and becomes a low-temperature, low-pressure two-phase gaseous refrigerant. The two-phase gaseous refrigerant then enters the evaporator 4, where it evaporates and absorbs heat (absorbing heat from the vehicle interior to cool the interior), becoming a low-temperature, low-pressure gaseous refrigerant. Finally, the gaseous refrigerant returns to the compressor 1, and the cycle continues. In this operating mode, the water-cooled condenser 2 does not work, and the refrigerant in the water-cooled condenser 2 does not need to exchange heat with the antifreeze. The water-cooled condenser 2 only serves as a refrigerant passage. The outdoor heat exchanger 3 is equivalent to the outdoor unit of a household air conditioner, releasing heat to the outside of the vehicle. The evaporator 4 is equivalent to the indoor unit of a household air conditioner, cooling the interior of the vehicle.

[0040] like Figure 3 As shown, in hot water mode, the refrigerant circulation loop of this vehicle air conditioning and water heater combined system has the first expansion valve 5 and the second shut-off valve 8 open, and the first shut-off valve 7 and the second expansion valve 6 closed. The refrigerant flows sequentially through the compressor 1, the water-cooled condenser 2, the first expansion valve 5, the outdoor heat exchanger 3, and the second shut-off valve 8, returning to the compressor 1. In the antifreeze circulation loop, the antifreeze exchanges heat with the refrigerant in the water-cooled condenser 2. In the water circulation loop, water is used to exchange heat with the antifreeze in the heat exchanger 11. The refrigerant is compressed in the compressor 1 into a high-temperature, high-pressure gaseous refrigerant. The gaseous refrigerant enters the water-cooled condenser 2 and condenses and dissipates heat to become a liquid refrigerant. The liquid refrigerant is throttled through the first expansion valve 5 to become a low-temperature, low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant enters the outdoor heat exchanger 3 and evaporates and absorbs heat to become a low-temperature, low-pressure gaseous refrigerant. Finally, the gaseous refrigerant returns to the compressor 1 through the second shut-off valve 8, and the cycle continues. In this system, the antifreeze in the antifreeze circulation loop and the refrigerant in the refrigerant circulation loop exchange heat in the water-cooled condenser 2. After absorbing heat from the refrigerant, the antifreeze heats the water in the heat exchanger 11, transforming the cold water into hot water for user use. In this operating mode, the water-cooled condenser 2 serves as the heat source for heating the water; the outdoor heat exchanger 3 is equivalent to the indoor unit of a household air conditioner, except that it is located outside the vehicle, releasing cool air outside.

[0041] like Figure 4As shown, in the air conditioning cooling + hot water mode of the vehicle air conditioning water heater combined system, in the refrigerant circulation loop, the first shut-off valve 7 and the second expansion valve 6 are open, and the second shut-off valve 8 and the first expansion valve 5 are closed. The refrigerant flows sequentially through the compressor 1, the water-cooled condenser 2, the first shut-off valve 7, the outdoor heat exchanger 3, the second expansion valve 6, and the evaporator 4, and returns to the compressor 1. In the antifreeze circulation loop, the antifreeze exchanges heat with the refrigerant in the water-cooled condenser 2. In the water circulation loop, water is needed to exchange heat with the antifreeze in the heat exchanger 11. The refrigerant is compressed in compressor 1 into a high-temperature, high-pressure gaseous refrigerant. This gaseous refrigerant enters the water-cooled condenser 2, where it condenses and dissipates heat to become a liquid refrigerant. The liquid refrigerant then passes through the first shut-off valve 7 and the outdoor heat exchanger 3 before entering the second expansion valve 6. The liquid refrigerant is throttled by the second expansion valve 6, becoming a low-temperature, low-pressure two-phase refrigerant. This two-phase refrigerant enters the evaporator 4, where it evaporates and absorbs heat (absorbing heat from the vehicle interior for cooling) to become a low-temperature, low-pressure gaseous refrigerant. Finally, the gaseous refrigerant returns to compressor 1, and the cycle repeats. Meanwhile, the antifreeze in the antifreeze circulation loop and the refrigerant in the refrigerant circulation loop exchange heat in the water-cooled condenser 2. The antifreeze absorbs heat from the refrigerant and then heats the water in the heat exchanger 11, turning cold water into hot water for the user. In this operating mode, the water-cooled condenser 2 is used as a heat source to heat the water required; the outdoor heat exchanger 3 does not work and only serves as a refrigerant passage; the evaporator 4 is equivalent to the indoor unit of a household air conditioner, cooling the vehicle interior.

[0042] Optionally, the refrigerant circulation loop also includes a gas-liquid separator 9, which is located at the refrigerant inlet of the compressor 1 to prevent liquid refrigerant from being mixed in with gaseous refrigerant and causing liquid slugging in the compressor 1.

[0043] Optionally, the refrigerant circulation loop also includes a one-way valve 10, which is located at the refrigerant outlet of the evaporator 4, so that the refrigerant can only flow from the evaporator 4 to the compressor 1, thus preventing refrigerant backflow.

[0044] Optionally, the antifreeze circulation loop also includes a first water pump 12, which is located between the water-cooled condenser 2 and the heat exchanger 11, so as to facilitate the flow of antifreeze in the water-cooled condenser 2 into the heat exchanger 11, thereby increasing the circulation speed of antifreeze in the antifreeze circulation loop and thus improving the heat exchange efficiency.

[0045] Optionally, the water circulation loop also includes a second water pump 13, which is located between the cold water inlet 16 and the heat exchanger 11, so that the water required in the water circulation loop can flow smoothly into the heat exchanger 11, thereby increasing the circulation speed of the water required in the water circulation loop and increasing the hot water output.

[0046] Optionally, the antifreeze circulation loop also includes a fuel heater 14, which is located between the water-cooled condenser 2 and the heat exchanger 11. When a higher temperature water (hot water) is required, the fuel heater 14 can further heat the antifreeze, and the higher temperature antifreeze then enters the heat exchanger 11 to heat the water.

[0047] In this embodiment, the fuel heater 14 is located between the first water pump 12 and the heat exchanger 11.

[0048] Optionally, the water circulation loop also includes a gas heater 15, which is connected in parallel with the heat exchanger 11. When a large amount of hot water is needed, the heat exchanger 11 and the gas heater 15 can work simultaneously to heat a portion of the water needed, thus improving user convenience. Alternatively, only the gas heater 15 can be used to heat the water needed. The gas heater 15 can directly heat the water needed, resulting in high working efficiency.

[0049] In this embodiment, the second water pump 13, the gas heater 15, and the heat exchanger 11 are connected by a three-way valve.

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

Claims

1. A combined vehicle air conditioning and water heater system, characterized in that, include: The refrigerant circulation loop includes a compressor (1), a water-cooled condenser (2), an outdoor heat exchanger (3), an evaporator (4), a first expansion valve (5), a second expansion valve (6), a first shut-off valve (7), and a second shut-off valve (8). The compressor (1), the water-cooled condenser (2), the first expansion valve (5), the outdoor heat exchanger (3), the second expansion valve (6), and the evaporator (4) are connected in sequence. The first expansion valve (5) is connected in parallel with the first shut-off valve (7), and the evaporator (4) and the second expansion valve (6) are connected in parallel with the second shut-off valve (8). By selectively opening and closing the first expansion valve (5), the second expansion valve (6), the first shut-off valve (7), and the second shut-off valve (8), the flow direction of the refrigerant in the refrigerant circulation loop is changed to switch the working mode of the vehicle air conditioning water heater combined system. The antifreeze circulation loop includes a water-cooled condenser (2) and a heat exchanger (11), through which the antifreeze flows sequentially. The water circulation loop includes a cold water inlet (16), a heat exchanger (11), and a hot water outlet (17). Water needs to flow through the cold water inlet (16), the heat exchanger (11), and the hot water outlet (17) in sequence.

2. The vehicle air conditioning and water heater combined system according to claim 1, characterized in that, In the refrigerant circulation loop, the first shut-off valve (7) and the second expansion valve (6) are open, and the second shut-off valve (8) and the first expansion valve (5) are closed. The refrigerant flows sequentially through the compressor (1), the water-cooled condenser (2), the first shut-off valve (7), the outdoor heat exchanger (3), the second expansion valve (6), and the evaporator (4) before returning to the compressor (1). The antifreeze circulation loop and the water circulation loop are both closed.

3. The combined vehicle air conditioning and water heater system according to claim 1, characterized in that, In the refrigerant circulation loop, the first expansion valve (5) and the second shut-off valve (8) are open, and the first shut-off valve (7) and the second expansion valve (6) are closed. The refrigerant flows sequentially through the compressor (1), the water-cooled condenser (2), the first expansion valve (5), the outdoor heat exchanger (3), and the second shut-off valve (8) and returns to the compressor (1). In the antifreeze circulation loop, the antifreeze exchanges heat with the refrigerant in the water-cooled condenser (2); In the water circulation loop, the water to be used exchanges heat with the antifreeze in the heat exchanger (11).

4. The vehicle air conditioning and water heater combined system according to claim 1, characterized in that, In the refrigerant circulation loop, the first shut-off valve (7) and the second expansion valve (6) are open, and the second shut-off valve (8) and the first expansion valve (5) are closed. The refrigerant flows sequentially through the compressor (1), the water-cooled condenser (2), the first shut-off valve (7), the outdoor heat exchanger (3), the second expansion valve (6) and the evaporator (4), and returns to the compressor (1). In the antifreeze circulation loop, the antifreeze exchanges heat with the refrigerant in the water-cooled condenser (2); In the water circulation loop, the water to be used exchanges heat with the antifreeze in the heat exchanger (11).

5. The vehicle air conditioning and water heater combined system according to any one of claims 1-4, characterized in that, The refrigerant circulation loop also includes a gas-liquid separator (9), which is located at the refrigerant inlet of the compressor (1).

6. The vehicle air conditioning and water heater combined system according to any one of claims 1-4, characterized in that, The refrigerant circulation loop also includes a one-way valve (10), which is located at the refrigerant outlet of the evaporator (4).

7. The vehicle air conditioning and water heater combined system according to any one of claims 1-4, characterized in that, The antifreeze circulation loop also includes a fuel heater (14), which is located between the water-cooled condenser (2) and the heat exchanger (11).

8. The vehicle air conditioning and water heater combined system according to any one of claims 1-4, characterized in that, The water circulation loop also includes a gas heater (15), which is connected in parallel with the heat exchanger (11).

9. The vehicle air conditioning and water heater combined system according to any one of claims 1-4, characterized in that, The antifreeze circulation loop also includes a first water pump (12), which is located between the water-cooled condenser (2) and the heat exchanger (11).

10. The vehicle air conditioning and water heater combined system according to any one of claims 1-4, characterized in that, The water circulation loop also includes a second water pump (13), which is located between the cold water inlet (16) and the heat exchanger (11).

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