Refrigerating system and vehicle

Abstract

The utility model provides a refrigerating system and a vehicle, and relates to the technical field of automobile thermal management. The refrigerating system comprises a condenser, a compressor, a heat exchanger and a plurality of evaporators arranged in parallel, an air outlet of the compressor is communicated with a liquid inlet of the condenser, a liquid outlet of the condenser is communicated with a liquid inlet at the high-pressure end of the heat exchanger, the low-pressure end of the heat exchanger is communicated with the evaporators, and the evaporators are communicated with the compressor. And a high-pressure end return air outlet of the heat exchanger is communicated with an air inlet of the compressor. The single compressor provides refrigeration sources for different evaporator systems at the same time, for example, a vehicle-mounted air conditioner, a battery heat management system and a vehicle-mounted refrigerator, the separation mode of three traditional independent systems is broken through, integration of system components can be achieved, the refrigeration requirement of a single system or multiple systems is met, and the refrigeration efficiency is improved. And the number of compressors and repeated arrangement of whole vehicle parts are effectively reduced, and the weight, the size and the purchase cost of the system are reduced.

Description

Technical Field

[0001] This utility model relates to the field of automotive thermal management technology, and more specifically, to a refrigeration system and a vehicle. Background Technology

[0002] The thermal management system for new energy vehicles is one of the key subsystems that ensures the safe and efficient operation of electric vehicles (EVs), plug-in hybrid electric vehicles (PHEVs), and range-extended electric vehicles. Its main function is to ensure that the battery, electric drive system, and passenger compartment maintain optimal working conditions in various environments by controlling the temperature.

[0003] With the increasing demand for thermal management in new energy vehicles, the traditional refrigeration architecture has gradually revealed the following significant defects: Currently, the vehicle air conditioner, battery cooling and vehicle refrigerator operate independently, each equipped with a dedicated compressor or refrigeration equipment. This leads to redundant construction, wasted chassis space, equipment redundancy, and low average utilization rate of resources such as compressors. Utility Model Content

[0004] The problem this invention addresses is how to improve the overall vehicle cooling efficiency.

[0005] To solve the above problems, this utility model provides a refrigeration system and a vehicle.

[0006] In a first aspect, this utility model provides a refrigeration system, including a condenser, a compressor, a heat exchanger, and multiple evaporators connected in parallel. The outlet of the compressor is connected to the liquid inlet of the condenser, the liquid outlet of the condenser is connected to the high-pressure liquid inlet of the heat exchanger, the low-pressure end of the heat exchanger is connected to the multiple evaporators, and the high-pressure return outlet of the heat exchanger is connected to the inlet of the compressor.

[0007] Optionally, the plurality of evaporators include a battery pack cooling plate located in the battery branch, a refrigerator evaporator located in the refrigerator branch, and an air conditioning evaporator located in the air conditioning branch. The battery branch, the refrigerator branch, and the air conditioning branch are connected in parallel and then connected to the low-pressure end of the heat exchanger.

[0008] Optionally, the battery branch further includes a first expansion valve and a second expansion valve, wherein the first expansion valve is located at the inlet end of the battery pack cooling plate and the second expansion valve is located at the outlet end of the battery pack cooling plate.

[0009] Optionally, the refrigerator branch circuit further includes a first shut-off valve, which is located at the liquid inlet of the refrigerator evaporator and is used to control the on / off state of the refrigerator branch circuit.

[0010] Optionally, the refrigerator branch also includes a third expansion valve, which is connected in series between the first shut-off valve and the refrigerator evaporator. The third expansion valve is used to throttle the refrigerant from the condenser from a high-pressure liquid state to a low-pressure liquid state.

[0011] Optionally, the refrigerator branch circuit further includes a refrigerator, and the refrigerator evaporator is connected to the refrigerator through the refrigerator.

[0012] Optionally, the air conditioning branch includes a first air conditioning branch, which includes a front passenger compartment air conditioning evaporator and a second shut-off valve and a fourth expansion valve connected in series with the front passenger compartment air conditioning evaporator.

[0013] Optionally, the air conditioning branch includes a second air conditioning branch, which includes a rear passenger compartment air conditioning evaporator and a third shut-off valve and a fifth expansion valve connected in series with the rear passenger compartment air conditioning evaporator.

[0014] Optionally, the refrigeration system further includes a low-pressure switch connected in series between the heat exchanger and the evaporator.

[0015] Secondly, the present invention provides a vehicle including the refrigeration system as described in the first aspect.

[0016] The beneficial effects of the refrigeration system of this utility model are: by providing a cooling source for different evaporator systems simultaneously with a single compressor, such as providing a cooling source for vehicle air conditioning, battery thermal management and vehicle refrigerator respectively, it breaks the traditional separation mode of three independent systems, realizes the integration of system components, meets the cooling needs of single system or multiple systems at the same time, improves the overall vehicle cooling utilization rate, and effectively reduces the number of compressors and the duplication of vehicle components, reducing system weight, volume and procurement costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the refrigeration system according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram illustrating the cooling principle of a single-opening refrigerator according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram illustrating the principle of the cooling operation of the double-door refrigerator and the passenger compartment in an embodiment of this utility model.

[0020] Figure 4 This is a schematic diagram illustrating the cooling and battery cooling operation of a double-door refrigerator according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram illustrating the principle of the refrigerator, passenger compartment, and battery three-way cooling operation in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Condenser, 2-Compressor, 3-Heat exchanger, 4-Low pressure switch, 5-First expansion valve, 6-Battery pack cooling plate, 7-Second expansion valve, 8-First shut-off valve, 9-Third expansion valve, 10-Refrigerator, 11-Refrigerator evaporator, 12-Refrigerator, 13-Second shut-off valve, 14-Fourth expansion valve, 15-Front passenger compartment air conditioning evaporator, 16-Third shut-off valve, 17-Fifth expansion valve, 18-Rear passenger compartment air conditioning evaporator. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0025] It should be understood that the steps described in the method embodiments of this utility model may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this utility model is not limited in this respect.

[0026] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0027] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0028] The names of the messages or information exchanged between the multiple devices in this embodiment of the invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0029] like Figure 1 As shown in the figure, a refrigeration system provided by this utility model includes a condenser 1, a compressor 2, a heat exchanger 3, and a plurality of evaporators arranged in parallel. The air outlet of the compressor 2 is connected to the liquid inlet of the condenser 1, the liquid outlet of the condenser 1 is connected to the high-pressure liquid inlet of the heat exchanger 3, the low-pressure end of the heat exchanger 3 is connected to the plurality of evaporators, and the high-pressure return gas outlet of the heat exchanger 3 is connected to the air inlet of the compressor 2.

[0030] Specifically, the refrigeration system includes a condenser 1, a compressor 2, a heat exchanger 3, and multiple evaporators connected in parallel. The compressor 2 drives the refrigerant circulation of the entire system. The outlet of the compressor 2 is connected to the liquid inlet of the condenser 1. The compressor 2 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas. The high-temperature, high-pressure gas enters the condenser 1, which cools the gas to liquefy the refrigerant. The liquefied high-pressure liquid refrigerant enters the heat exchanger 3, where it is partially used for pre-cooling / reheating. The heat exchanger 3, as an intermediate link, is connected in parallel with the evaporator circuits of various systems (e.g., refrigerators, batteries, air conditioners) for heat exchange in the low-pressure return gas section. The return gas from all the evaporators is collected and enters the low-pressure side of the heat exchanger. After further absorbing heat through the gas return channel of the heat exchanger 3, it flows to the inlet of the compressor 2, completing a closed loop of the refrigeration circuit.

[0031] In this embodiment, the compressor 2 can be an air conditioning compressor with a large cooling capacity, which can provide a cooling source for the vehicle air conditioner, battery thermal management and vehicle refrigerator. This can realize the integration of system components, meet the cooling needs of a single system or multiple systems at the same time, and improve the overall vehicle cooling utilization rate.

[0032] In this technology, the vehicle's air conditioning, battery cooling, and refrigerator each employ independent refrigeration systems. For example, the air conditioning system typically uses a high-power compressor (cooling capacity ≥ 4000W), with the refrigerant circulating through the compressor → condenser → expansion valve → evaporator to achieve efficient phase-change refrigeration. The battery cooling system relies on a liquid cooling cycle (ethylene glycol medium + Chiller heat exchanger), where the liquid (such as ethylene glycol) flows through the cooling plate to exchange heat with the battery surface, and then exchanges heat with the air conditioning system through the Chiller. The refrigerator, on the other hand, uses a semiconductor cooling chip or a micro compressor (cooling capacity ≤ 100W). These three independent systems occupy more chassis space, and the average compressor utilization rate is low. Under parallel refrigeration conditions, the secondary heat exchange thermal resistance of the liquid cooling system (approximately 0.02-0.05) is also a significant factor. Due to unreasonable distribution of cooling capacity (m²·K / W), the overall COP (coefficient of performance) of the system is generally lower than 2.5, and the cooling capacity loss can reach 15-20%. Some models can achieve dual-system cooling, such as air conditioning and refrigerator sharing a compressor for cooling or air conditioning and battery sharing a compressor for cooling. However, the solution in this embodiment incorporates battery cooling, passenger compartment air conditioning cooling and refrigerator cooling into the same cooling circuit, and only one compressor is needed to complete the cooling control of the above three systems.

[0033] In this embodiment, a single compressor can simultaneously provide cooling sources for different evaporator systems, such as vehicle air conditioning, battery thermal management, and vehicle refrigerator. This breaks the traditional separation mode of three independent systems, enables the integration of system components, meets the cooling needs of a single system or multiple systems, improves the overall vehicle cooling utilization rate, and effectively reduces the number of compressors and redundant vehicle components, thereby reducing system weight, volume, and procurement costs.

[0034] Optionally, the plurality of evaporators include a battery pack cooling plate 6 located in the battery branch, a refrigerator evaporator 11 located in the refrigerator branch, and an air conditioning evaporator located in the air conditioning branch. The battery branch, the refrigerator branch, and the air conditioning branch are connected in parallel and then connected to the low-pressure end of the heat exchanger 3.

[0035] Specifically, the evaporator includes a battery pack cooling plate 6 located in the battery branch (equivalent to a direct-cooling evaporator structure, in which the refrigerant directly absorbs heat from the battery pack and evaporates), a refrigerator evaporator 11 located in the refrigerator branch, and air conditioning evaporators (front passenger compartment air conditioning evaporator 15 and rear passenger compartment air conditioning evaporator 18) located in the air conditioning branch. The battery branch, refrigerator branch, and air conditioning branch are connected in parallel and connected to the low-pressure end of the heat exchanger 3, which can realize the full utilization of energy and achieve independent energy distribution.

[0036] In this embodiment, the battery adopts direct cooling technology (using refrigerant to flow directly into the battery cold plate / cooling channel for phase change heat absorption, eliminating the intermediate heat exchange system). For the battery branch, the direct cooling system can reduce the number of heat exchange cycles, reduce heat exchange thermal resistance, reduce heat exchange temperature difference, and has good heat transfer performance. The refrigerant boils and generates heat in the battery cold plate, which significantly enhances the heat exchange capacity compared to the liquid cooling solution. In terms of layout space, it also saves the space occupied by components such as Chiller valves, water circuits, and water pumps.

[0037] Under the premise that the refrigerator has a refrigerant cooling requirement, this embodiment involves the following four operating conditions: single-open refrigerator cooling condition, double-open refrigerator cooling and passenger compartment cooling condition, double-open refrigerator cooling and battery cooling condition, and triple-open refrigerator, passenger compartment and battery cooling condition.

[0038] Combination Figure 2 As shown, in the single-operation refrigerator cooling mode, the refrigerant flows out from the compressor 2, passes through the condenser 1 and heat exchanger 3, enters the refrigerator radiator 11 through the first shut-off valve 8 and the third expansion valve 9 to absorb heat, and then returns to the compressor 2 through the heat exchanger 3. The exemplary control logic for the single-operation refrigerator cooling mode includes: checking the refrigerator's operating status; if the refrigerator is running, further checking the refrigerator's cooling level; if the cooling level is greater than or equal to 1, the compressor 2 is controlled according to the condensing temperature of the refrigerator radiator (for example, based on the feedback value of the condensing temperature of the refrigerator radiator, determining whether the evaporator's heat exchange capacity meets the standard; if the condensing temperature is too low, it indicates that the compressor is not cooling enough, so the compressor speed is increased; if the condensing temperature has met the standard or is too high, the speed is maintained or decreased), and the first shut-off valve 8 is opened; if the cooling level is less than 1, the compressor 2 is turned off and the first shut-off valve 8 is closed; if the refrigerator is not running, the compressor 2 is directly turned off and the first shut-off valve 8 is closed.

[0039] Among them, the cooling levels of refrigerators can be divided into: (1) Cooling level 0, no cooling; (2) Cooling level 1, low cooling demand; (3) Cooling level 2, high cooling demand.

[0040] Combination Figure 3As shown, for the dual-door refrigerator cooling and passenger compartment cooling operation, the exemplary control logic includes: checking whether the refrigerator is running; if the refrigerator is running, then determining whether compressor 2 has reached maximum performance and passenger compartment cooling is prioritized; if the conditions are met, further checking whether the refrigerator cooling level is 2; if the cooling level is 2, the compressor 2 speed is controlled according to the air conditioner evaporator temperature (for example, by collecting the air conditioner evaporator outlet temperature or intermediate temperature through a sensor and comparing it with the target temperature; if the temperature is too high, it indicates insufficient heat exchange of the evaporator, so the compressor speed is increased; if the temperature is too low, it indicates that the cooling capacity may be excessive, so the compressor speed is reduced), and simultaneously opening the first shut-off valve 8; if the cooling level is not 2, the compressor 2 speed is controlled according to the air conditioner evaporator temperature. The evaporator temperature is controlled, but the first shut-off valve 8 is closed. If the compressor does not reach maximum performance or the passenger compartment cooling request is not prioritized, the refrigerator cooling level is checked to be greater than or equal to 1. If the cooling level is greater than or equal to 1, the compressor 2 speed is also controlled according to the air conditioner evaporator temperature and the first shut-off valve 8 is opened. If the cooling level is less than 1, the compressor 2 speed is controlled according to the air conditioner evaporator temperature, but the first shut-off valve 8 is closed. If the refrigerator is not running, the first shut-off valve 8 is closed directly, and the compressor 2 control depends on the air conditioner evaporator heat dissipation request (for example, detecting the temperature of the front passenger compartment air conditioner evaporator 15 and the rear passenger compartment air conditioner evaporator 18, calculating the cooling intensity requirement based on the difference with the target temperature, and thus adjusting the compressor 2 speed).

[0041] Combination Figure 4As shown, for both the double-door refrigerator cooling and battery cooling modes, the exemplary control logic includes: checking if the refrigerator is running; if the refrigerator is running and compressor 2 has reached maximum performance for 30 seconds, then determining if the battery cooling level is high; if the battery cooling level is high, the compressor 2 speed is controlled according to the battery cooling target temperature, and the first shut-off valve 8 is closed; if the battery cooling level is not high, then further checking if battery cooling is prioritized; if battery cooling is prioritized, the compressor 2 speed is controlled according to the battery cooling target temperature, and the first shut-off valve 8 is opened; if not prioritized, then checking if the refrigerator cooling level is 2; if the refrigerator cooling level is 2, the compressor speed is controlled according to the battery cooling target temperature (e.g., reading temperature data from multiple points within the battery pack and setting...). If the current temperature is higher than the target temperature, the compressor speed is increased; if the current temperature is lower than the target temperature, the compressor speed is decreased, and the first shut-off valve 8 is opened. If the refrigerator cooling level is not 2, the compressor speed is controlled according to the battery cooling target temperature, and the first shut-off valve 8 is closed. If the compressor 2 does not reach maximum performance or does not last for 30 seconds, the refrigerator cooling level is directly checked to see if it is greater than or equal to 1. If the refrigerator cooling level is greater than or equal to 1, the compressor speed is controlled according to the battery cooling target temperature, and the first shut-off valve 8 is opened. If the refrigerator cooling level is less than 1, the compressor speed is controlled according to the battery cooling target temperature, and the first shut-off valve 8 is closed. If the refrigerator is not running, the compressor speed is controlled according to the battery cooling target temperature, and the first shut-off valve 8 is closed.

[0042] Among them, the battery cooling levels can be divided into: (1) Cooling level 0, no cooling; (2) Cooling level 1, conventional cooling; (3) Cooling level 2, forced rapid cooling.

[0043] Combination Figure 5As shown, for the three-way cooling operation of the refrigerator, passenger compartment, and battery, the exemplary control logic includes: checking whether the refrigerator is running; if the refrigerator is running, then determining whether compressor 2 has reached its maximum performance; if compressor 2 has reached its maximum performance, then determining whether battery cooling is prioritized; if battery cooling is prioritized, further checking whether the battery cooling level is high; if the battery cooling level is high, then the compressor 2 speed is controlled according to the target battery cooling temperature, and the first shut-off valve 8 is closed; if the battery cooling level is not high, then checking whether the refrigerator cooling level is 2; if the refrigerator cooling level is 2, then the compressor 2 speed is controlled according to the air conditioner evaporator temperature, and the first shut-off valve 8 is opened; if the refrigerator cooling level is not 2, then the compressor 2 speed is controlled according to the air conditioner evaporator temperature, and the first shut-off valve 8 is closed; if If battery cooling is not prioritized, then the priority is determined by whether passenger compartment cooling is prioritized. If passenger compartment cooling is prioritized and the refrigerator cooling level is 2, then the compressor 2 speed is controlled according to the air conditioner evaporator temperature, and the first shut-off valve 8 is opened. If the refrigerator cooling level is not 2, then the compressor 2 speed is controlled according to the air conditioner evaporator temperature, and the first shut-off valve 8 is closed. If passenger compartment cooling is not prioritized, and the refrigerator cooling level is ≥1, then the compressor 2 speed is controlled according to the air conditioner evaporator temperature, and the first shut-off valve 8 is opened. If the refrigerator cooling level is <1, then the compressor 2 speed is controlled according to the battery cooling target temperature, and the first shut-off valve 8 is closed. If the compressor does not reach maximum performance, then the control method of compressor 2 speed and the state of the first shut-off valve 8 are determined according to the refrigerator cooling level ≥1. If the refrigerator is not running, then the first shut-off valve 8 is closed.

[0044] In this optional embodiment, by connecting the battery cooling plate, refrigerator evaporator, and front and rear passenger compartment evaporators in parallel in the system, a single compressor is able to serve multiple refrigeration demand subsystems simultaneously or independently, thereby improving system integration, resource utilization, and thermal management flexibility.

[0045] Optionally, the battery branch further includes a first expansion valve 5 and a second expansion valve 7, wherein the first expansion valve 5 is located at the inlet end of the battery pack cooling plate 6 and the second expansion valve 7 is located at the outlet end of the battery pack cooling plate 6.

[0046] Specifically, the battery branch also includes a first expansion valve 5 and a second expansion valve 7. The first expansion valve 5 is located at the inlet end of the battery pack cooling plate 6, and the second expansion valve 7 is located at the outlet end of the battery pack cooling plate 6. The first expansion valve 5 is used to throttle and reduce the pressure of the high-temperature and high-pressure liquid refrigerant from the condenser 1, transforming it into a low-temperature and low-pressure state, and to control the mass flow rate of the refrigerant flowing into the battery pack cooling plate 6. It can dynamically adjust the opening degree in response to changes in battery temperature or cooling demand, ensuring that the refrigerant fully evaporates and absorbs heat in the battery pack cooling plate 6, avoiding overcooling or liquid slugging. The second expansion valve 7 can control the pressure and evaporation rate on the outlet side of the battery pack cooling plate 6, preventing incomplete evaporation or excessive evaporation, and suppressing overheating or overcooling phenomena in the compressor 2.

[0047] In this optional embodiment, inlet and outlet electronic expansion valves are configured in the battery branch to construct a dual-valve control mechanism, which helps to achieve precise control of evaporation pressure, refrigerant flow rate and phase change degree in the battery cooling plate, effectively improving cooling efficiency and temperature control accuracy, and meeting the high-performance requirements of battery thermal management.

[0048] Optionally, the refrigerator branch also includes a first shut-off valve 8, which is located at the liquid inlet of the refrigerator evaporator 11 and is used to control the on / off state of the refrigerator branch.

[0049] Specifically, the refrigerator branch circuit also includes a first shut-off valve 8, which is located at the liquid inlet of the refrigerator evaporator 11. The first shut-off valve 8 can control whether the refrigerant enters the refrigerator branch circuit and closes when the refrigerator does not need to cool, so as to avoid unnecessary flow of refrigerant and waste of energy. It can also automatically control the opening and closing according to the refrigerator's operating status and cooling level.

[0050] In this optional embodiment, by installing a refrigerant shut-off valve in the refrigerator branch, cooling can be intelligently controlled according to the system operating conditions, effectively achieving energy saving, functional zoning isolation, and fault-tolerant control, enhancing the system's flexibility and safety, and is particularly suitable for the independent operation needs of the refrigerator in non-driving mode.

[0051] Optionally, the refrigerator branch also includes a third expansion valve 9, which is connected in series between the first shut-off valve 8 and the refrigerator evaporator 11. The third expansion valve 9 is used to throttle the refrigerant from the condenser 1 from a high-pressure liquid state to a low-pressure liquid state.

[0052] Specifically, the refrigerator branch also includes a third expansion valve 9, which is connected in series between the first shut-off valve 8 and the refrigerator evaporator 11. The third expansion valve 9 throttles the high-pressure liquid refrigerant from the condenser 1 to a low-pressure liquid state, providing a suitable refrigerant state for the refrigerator evaporator 11, and can automatically adjust the opening to maintain a stable superheat at the outlet of the refrigerator evaporator 11 (i.e., ensure that the refrigerant evaporates completely and prevents liquid refrigerant from entering the compressor 2).

[0053] In this optional embodiment, by introducing a thermostatic expansion valve to throttle the refrigerant flowing into the refrigerator evaporator, the refrigerator evaporator can be kept running stably under appropriate pressure and superheat, improving phase change heat transfer efficiency and ensuring that the compressor is not damaged by liquid backflow, thus guaranteeing refrigeration stability.

[0054] Optionally, the refrigerator branch circuit further includes a cooler 10, and the refrigerator evaporator 11 is connected to the refrigerator 12 through the cooler 10.

[0055] Specifically, the refrigerator branch circuit also includes a cooler 10. The cooling end of the cooler 10 is connected to the inner liner of the refrigerator 12, and the heat dissipation end of the cooler 10 is in close contact with the refrigerator evaporator 11. The cooler 10 is usually a semiconductor cooler. The heat dissipation end of the semiconductor cooler is quickly carried away by the refrigerator evaporator 11, which improves the cooling capacity of the semiconductor cooler and makes up for the lack of cooling capacity of the semiconductor cooler (the cooling capacity of the semiconductor cooler is limited, and it can generally only achieve cooling at 17-25°C below the ambient temperature). It can achieve a variety of different cooling levels (such as no cooling, low cooling demand and high cooling demand), so that the lowest temperature of the vehicle refrigerator can reach -18°C.

[0056] In this optional embodiment, the refrigerator evaporator is thermally connected to the refrigerator liner through a semiconductor cooler to form a composite refrigeration mechanism, which can quickly remove the waste heat of the semiconductor device, improve the refrigeration depth and response speed, expand the temperature regulation range from refrigeration to freezing, and enhance the refrigerator's refrigeration capacity.

[0057] Optionally, the air conditioning branch includes a first air conditioning branch, which includes a front passenger compartment air conditioning evaporator 15 and a second shut-off valve 13 and a fourth expansion valve 14 connected in series with the front passenger compartment air conditioning evaporator 15.

[0058] Specifically, for the first air conditioning branch corresponding to the front passenger compartment, the second shut-off valve 13 can control whether the refrigerant enters the front passenger compartment air conditioning evaporator 15, and the fourth expansion valve 14 is used to throttle and reduce the pressure of the refrigerant flowing into the front passenger compartment air conditioning evaporator 15 to form a low temperature and low pressure liquid state.

[0059] In this optional embodiment, a refrigerant shut-off valve and an expansion valve are installed in the front passenger compartment to form an independent and controllable air conditioning branch, which can supply cooling to the front row of the passenger compartment as needed, realize zoned air supply, energy saving and consumption reduction and improve driving comfort, while avoiding unnecessary refrigerant waste.

[0060] Optionally, the air conditioning branch includes a second air conditioning branch, which includes a rear passenger compartment air conditioning evaporator 18 and a third shut-off valve 16 and a fifth expansion valve 17 connected in series with the rear passenger compartment air conditioning evaporator 18.

[0061] Specifically, for the second air conditioning branch corresponding to the rear passenger compartment, the third shut-off valve 16 can control whether the refrigerant enters the rear passenger compartment air conditioning evaporator 18, and the fifth expansion valve 17 is used to throttle and reduce the pressure of the refrigerant flowing into the rear passenger compartment air conditioning evaporator 18 to form a low-temperature and low-pressure liquid state.

[0062] In this optional embodiment, an independent shut-off valve and expansion valve are installed in the rear passenger compartment, enabling the vehicle's air conditioning system to have the capability of "separate front and rear control," enhancing the comfort adjustment range and usage freedom of rear passengers, which is especially suitable for multi-row seat vehicles and supports energy-saving optimization strategies.

[0063] Optionally, the refrigeration system further includes a low-pressure switch 4, which is connected in series between the heat exchanger 3 and the evaporator.

[0064] Specifically, the refrigeration system also includes a low-pressure switch 4, which is connected in series between the heat exchanger 3 and the evaporator. The low-pressure switch 4 can protect the pressure of the entire system circuit. In an emergency (such as when the refrigerant pressure in the circuit is too low), it can cut off the compressor and stop the refrigerator from running, preventing the compressor from accumulating liquid and becoming stuck during operation, thus protecting the compressor. When the pressure in the system returns to normal and the compressor has been off for more than the safe time, the compressor can be restarted.

[0065] In this optional embodiment, a low-pressure switch can be configured to monitor the evaporator return gas pressure in real time. When an abnormal pressure is detected, the compressor operating circuit can be actively disconnected to protect the system safety, effectively prevent the compressor from running dry or liquid slugging, and improve the functional safety level and reliability of the system.

[0066] This utility model provides a vehicle including the above-described refrigeration system.

[0067] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A refrigeration system, characterized in that, It includes a condenser (1), a compressor (2), a heat exchanger (3), and multiple evaporators connected in parallel. The outlet of the compressor (2) is connected to the inlet of the condenser (1), the outlet of the condenser (1) is connected to the high-pressure inlet of the heat exchanger (3), the low-pressure end of the heat exchanger (3) is connected to multiple evaporators, and the high-pressure return outlet of the heat exchanger (3) is connected to the inlet of the compressor (2).

2. The refrigeration system according to claim 1, characterized in that, The plurality of evaporators include a battery pack cooling plate (6) located in the battery branch, a refrigerator evaporator (11) located in the refrigerator branch, and an air conditioning evaporator located in the air conditioning branch. The battery branch, the refrigerator branch, and the air conditioning branch are connected in parallel and connected to the low-pressure end of the heat exchanger (3).

3. The refrigeration system according to claim 2, characterized in that, The battery branch also includes a first expansion valve (5) and a second expansion valve (7), the first expansion valve (5) being located at the inlet end of the battery pack cooling plate (6) and the second expansion valve (7) being located at the outlet end of the battery pack cooling plate (6).

4. The refrigeration system according to claim 2, characterized in that, The refrigerator branch also includes a first shut-off valve (8), which is located at the liquid inlet of the refrigerator evaporator (11) and is used to control the on / off state of the refrigerator branch.

5. The refrigeration system according to claim 4, characterized in that, The refrigerator branch also includes a third expansion valve (9), which is connected in series between the first shut-off valve (8) and the refrigerator evaporator (11). The third expansion valve (9) is used to throttle the refrigerant from the condenser (1) from a high-pressure liquid state to a low-pressure liquid state.

6. The refrigeration system according to claim 2, characterized in that, The refrigerator branch also includes a cooler (10), and the refrigerator evaporator (11) is connected to the refrigerator (12) through the cooler (10).

7. The refrigeration system according to claim 2, characterized in that, The air conditioning branch includes a first air conditioning branch, which includes a front passenger compartment air conditioning evaporator (15) and a second shut-off valve (13) and a fourth expansion valve (14) connected in series with the front passenger compartment air conditioning evaporator (15).

8. The refrigeration system according to claim 2, characterized in that, The air conditioning branch includes a second air conditioning branch, which includes a rear passenger compartment air conditioning evaporator (18) and a third shut-off valve (16) and a fifth expansion valve (17) connected in series with the rear passenger compartment air conditioning evaporator (18).

9. The refrigeration system according to any one of claims 1 to 8, characterized in that, It also includes a low-pressure switch (4), which is connected in series between the heat exchanger (3) and the evaporator.

10. A vehicle, characterized in that, Includes the refrigeration system according to any one of claims 1 to 9.

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