Efficient heat pump system for new energy vehicle

Abstract

The utility model discloses an efficient heat pump system for a new energy vehicle, which comprises a plate heat exchanger, a refrigerant outlet of the plate heat exchanger is communicated with an inlet of a gas-liquid separator through a pipeline, and a temperature and pressure sensor I is connected in series on the pipeline for connecting the gas-liquid separator and the plate heat exchanger; an outlet of the gas-liquid separator is connected with an inlet of the electric compressor through a pipeline, an outlet of the electric compressor is connected with an inlet of the indoor condenser through a guide pipe, and an outlet of the indoor condenser is communicated with an inlet of the liquid storage device and an inlet of the outdoor radiator through a three-way guide pipe. Liquid refrigerants in the outdoor radiator and the indoor condenser core body can enter the liquid storage device in time, the occupied heat exchange area of the heat exchanger core body is reduced, and therefore efficient work of all heat exchangers is kept; and the control logic of the variable supercooling degree of 6-20 DEG C of the system is accurate and controllable, so that the performance of the whole system can be well exerted.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle technology, specifically a high-efficiency heat pump system for new energy vehicles. Background Technology

[0002] Currently, new energy vehicles are experiencing rapid development in commercial vehicles, passenger vehicles, and construction machinery. Different manufacturers are pursuing different approaches to heat pump air conditioning: some use compressor exhaust and plate heat exchangers without modifying the original air conditioning unit; the heat from the plate heat exchanger is carried by water to the heating core in the air conditioning unit, where it exchanges heat with the air in the passenger compartment; others directly use PTC air heaters, and so on. True heat pump heating systems generally use refrigerants such as R744 supercritical system, R1234YF, R290, and R134A. However, the industry still predominantly uses R134A as the heat pump refrigerant, mainly because the R744 supercritical system has high pressure, high cost, and unsatisfactory cooling performance; R1234YF can directly replace R134A, but in practical applications, it generally requires an additional regenerator, resulting in high cost, some flammability, and lower performance compared to R134A refrigeration systems; R290's flammability limits its promotion and application. Utility Model Content

[0003] The technical problem this invention aims to solve is to overcome existing defects and provide a high-efficiency heat pump system for new energy vehicles. This system reduces the heat exchange area occupied by the heat exchanger core, thereby maintaining the efficient operation of each heat exchanger. It also ensures accurate and controllable logic for controlling the system's subcooling degree from 6°C to 20°C, thus guaranteeing better performance of the entire system. Under these conditions, it enables the operation of new energy air conditioning modes, such as: cab cooling, battery cooling, dehumidification, cab heating, defrosting, and simultaneous cooling of the cab and battery. This effectively solves the problems in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency heat pump system for new energy vehicles, including a plate heat exchanger. The refrigerant outlet of the plate heat exchanger is connected to the inlet of a gas-liquid separator via a pipeline. A temperature and pressure sensor is connected in series on the pipeline connecting the gas-liquid separator and the plate heat exchanger. The outlet of the gas-liquid separator is connected to the inlet of an electric compressor via a pipeline. The outlet of the electric compressor is connected to the inlet of an indoor condenser via a conduit. The outlet of the indoor condenser is connected to the inlets of a liquid receiver and an outdoor radiator via a three-way conduit. A solenoid valve is installed on the conduit connecting the three-way conduit to the inlets of the liquid receiver and the outdoor radiator, respectively. The gas-liquid separator and the plate heat exchanger... Temperature and pressure sensors are connected in series on the connecting pipes. A refrigerant pipe connects the refrigerant inlet of the plate heat exchanger to the liquid receiver, and an electronic expansion valve is connected in series on the refrigerant pipe. Two conduits connect the outdoor radiator and the liquid receiver, and a one-way valve and an electronic expansion valve are connected in series on the two conduits respectively. The inlet of the outdoor radiator is connected to the evaporator through a conduit. The pipe connecting the evaporator and the outdoor radiator is connected to the inlet of the gas-liquid separator, and a solenoid valve is installed on the conduit connecting the evaporator and the outdoor radiator. The other port of the evaporator is connected to the liquid receiver, and an electronic expansion valve is connected in series on the conduit connecting the evaporator and the liquid receiver. The battery refrigerant inlet and outlet of the plate heat exchanger are connected to a battery temperature control system.

[0005] Furthermore, an exhaust temperature sensor is installed at the outlet of the electric compressor.

[0006] Furthermore, temperature detection devices are installed on the outdoor radiator, evaporator, and indoor condenser.

[0007] Furthermore, the battery temperature control system includes a kettle, the inlet of which is connected to the battery coolant outlet of the plate heat exchanger via a pipe, the outlet of which is connected to the inlet of a water pump via a pipe, the outlet of which is connected to the coolant inlet of the battery cooling unit via a pipe, and the coolant outlet of the battery cooling unit is connected to the battery coolant inlet of the plate heat exchanger via a pipe.

[0008] Furthermore, temperature detection devices are installed at both the battery coolant outlet and inlet of the plate heat exchanger.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This high-efficiency heat pump system for new energy vehicles has the following advantages:

[0010] Compared with ordinary air conditioning systems, this utility model features a pipe convergence point and an additional multi-inlet / outlet liquid receiver. This not only ensures efficient heat exchange at 0°C superheat in the evaporator during operation, but also allows liquid refrigerant in the outdoor radiator and indoor condenser cores to enter the liquid receiver in a timely manner, reducing the heat exchange area occupied by the heat exchanger cores and thus maintaining the efficient operation of each heat exchanger. Furthermore, it ensures accurate and controllable logic for controlling the system's subcooling from 6°C to 20°C, thereby guaranteeing better performance of the entire system.

[0011] This invention achieves variable subcooling control and, in conjunction with the system's original gas-liquid separator, creates a system architecture with "0" evaporator overheating. This allows both the evaporator and the indoor condenser to operate efficiently under various conditions, enabling the operation of new energy air conditioning modes such as: cab cooling, battery cooling, dehumidification, cab heating, defrosting, and simultaneous cooling of the cab and battery. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the single-cell cooling structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the battery + HVAC refrigeration structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the first flow direction structure of the battery cooling + HVAC system of this utility model;

[0016] Figure 5 This is a schematic diagram of the second flow direction structure of the battery cooling + HVAC system of this utility model;

[0017] Figure 6 This is a schematic diagram of the HVAC refrigeration structure of this utility model;

[0018] Figure 7 This is a schematic diagram of the first flow direction structure of the HVAC heating system of this utility model;

[0019] Figure 8 This is a schematic diagram of the second flow direction structure for HVAC heating according to this utility model;

[0020] Figure 9 This is a schematic diagram of the third flow direction structure for HVAC heating according to this utility model;

[0021] Figure 10 This is a schematic diagram of the first flow direction structure for defrosting and defogging according to this utility model;

[0022] Figure 11This is a schematic diagram of the second flow direction structure for defrosting and defogging according to this utility model;

[0023] Figure 12 This is a schematic diagram of the third flow direction structure for defrosting and defogging according to this utility model;

[0024] Figure 13 This is a schematic diagram of the external defrosting structure of this utility model.

[0025] In the diagram: 1 Plate heat exchanger, 2 Gas-liquid separator, 3 Temperature and pressure sensor 1, 4 Electric compressor, 5 Solenoid valve 3, 6 Exhaust temperature sensor, 7 Indoor condenser, 8 Solenoid valve 2, 9 Refrigerant piping, 10 Liquid receiver, 11 Electronic expansion valve, 12 Outdoor radiator, 13 Check valve, 14 Evaporator, 15 Electronic expansion valve 3, 16 Kettle, 17 Water pump, 18 Battery cooling unit, 19 Electronic expansion valve 2, 20 Solenoid valve 1. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-13This utility model provides a technical solution: a high-efficiency heat pump system for new energy vehicles, including a plate heat exchanger 1. The refrigerant outlet of the plate heat exchanger 1 is connected to the inlet of a gas-liquid separator 2 via a pipeline. A temperature and pressure sensor 3 is connected in series on the pipeline connecting the gas-liquid separator 2 and the plate heat exchanger 1. The outlet of the gas-liquid separator 2 is connected to the inlet of an electric compressor 4 via a pipeline. The outlet of the electric compressor 4 is connected to the inlet of an indoor condenser 7 via a conduit. The outlet of the indoor condenser 7 is connected to the inlets of a liquid receiver 10 and an outdoor radiator 12 via a three-way conduit. The conduit connecting the three-way conduit to the inlets of the liquid receiver 10 and the outdoor radiator 12 is... Solenoid valves 3 (5) and 2 (8) are installed respectively. Temperature and pressure sensors 3 are connected in series on the pipe connecting the gas-liquid separator 2 and the plate heat exchanger 1. A refrigerant pipe 9 connects the refrigerant inlet of the plate heat exchanger 1 to the liquid receiver 10, and an electronic expansion valve 11 is connected in series on the refrigerant pipe 9. Two conduits connect the outdoor radiator 12 and the liquid receiver 10, with a one-way valve 13 and an electronic expansion valve 19 connected in series on each conduit. The inlet of the outdoor radiator 12 is connected to the evaporator 14 via a conduit. The pipe connecting the evaporator 14 and the outdoor radiator 12 is connected to the inlet of the gas-liquid separator 2, and the conduit connecting the evaporator 14 and the outdoor radiator 12 is equipped with… There is a solenoid valve 20. Another port of the evaporator 14 is connected to the liquid receiver 10, and an electronic expansion valve 15 is connected in series on the conduit connecting the evaporator 14 and the liquid receiver 10. The battery refrigerant inlet and outlet of the plate heat exchanger 1 are connected to a battery temperature control system. An exhaust temperature sensor 6 is installed on the outlet of the electric compressor 4. Temperature detection devices are installed on the outdoor radiator 12, the evaporator 14, and the indoor condenser 7. The battery temperature control system includes a water tank 16. The inlet of the water tank 16 is connected to the battery coolant outlet of the plate heat exchanger 1 through a pipe, and the outlet of the water tank 16 is connected to the inlet of the water pump 17 through a pipe. The outlet of the water pump 17 is connected to the battery radiator through a pipe. The coolant inlet of the unit 18 is connected, and the coolant outlet of the battery cooling unit 18 is connected to the battery coolant inlet of the plate heat exchanger 1 through a pipeline. Temperature detection devices are installed at both the battery coolant outlet and inlet of the plate heat exchanger 1. Compared with ordinary air conditioning systems, this utility model has a pipeline convergence point and adds a multi-inlet and multi-outlet liquid storage tank 10. This not only ensures efficient heat exchange of the evaporator at 0°C during operation, but also allows the liquid refrigerant in the outdoor radiator 12 and the indoor condenser 7 core to enter the liquid storage tank 10 in a timely manner, reducing the heat exchange area occupied by the heat exchanger core and thus maintaining the efficient operation of each heat exchanger.This also ensures accurate and controllable logic for controlling the system's variable subcooling from 6℃ to 20℃, thereby guaranteeing good performance of the entire system. This invention achieves variable subcooling control and, in conjunction with the system's existing gas-liquid separator 2, creates a system architecture with "0" evaporator overheating. This allows both the evaporator 14 and the indoor condenser 7 to operate efficiently under various conditions, enabling the implementation of new energy air conditioning operation modes, such as: cab cooling, battery cooling, dehumidification, cab heating, defrosting, and simultaneous cooling of the cab and battery.

[0028] In operation: The refrigerant in the gas-liquid separator 2 is compressed by the electric compressor 4, and then the refrigerant enters the indoor condenser 7. After passing through the indoor condenser 7, the refrigerant can enter the liquid receiver 10 or directly enter the outdoor radiator 12. The outdoor radiator 12 dissipates heat from the refrigerant, and the cooled refrigerant enters the plate heat exchanger 1 through the liquid receiver 10. The refrigerant cools the battery coolant, and the water pump 17 draws the cooled battery coolant into the battery cooling unit 18 to cool the battery. The flow of the refrigerant is controlled by solenoid valves 20, 8, 5, 11, 15, and 19, thereby achieving single-cell cooling, battery + HVAC cooling, battery cooling + HVAC heating, HVAC cooling, HVAC heating, demisting, dehumidifying, and defrosting. The specific control flow diagram is shown below. Figure 2-13 .

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A high-efficiency heat pump system for new energy vehicles, comprising a plate heat exchanger (1), characterized in that: The refrigerant outlet of the plate heat exchanger (1) is communicated with the inlet of the gas-liquid separator (2) through a pipeline, and a temperature and pressure sensor one (3) is connected in series on the pipeline connecting the gas-liquid separator (2) and the plate heat exchanger (1), the outlet of the gas-liquid separator (2) is connected with the inlet of the electric compressor (4) through a pipeline, the outlet of the electric compressor (4) is connected with the inlet of the indoor condenser (7) through a conduit, the outlet of the indoor condenser (7) is communicated with the inlets of the liquid accumulator (10) and the outdoor radiator (12) through a three-way conduit, the three-way conduit is connected with the inlets of the liquid accumulator (10) and the outdoor radiator (12), and an electromagnetic valve three (5) and an electromagnetic valve two (8) are arranged on the conduits connected with the inlets of the liquid accumulator (10) and the outdoor radiator (12), respectively, a temperature and pressure sensor one (3) is connected in series on the pipeline connecting the gas-liquid separator (2) and the plate heat exchanger (1), a refrigerant pipeline (9) is connected between the refrigerant inlet of the plate heat exchanger (1) and the liquid accumulator (10), an electronic expansion valve (11) is connected in series on the refrigerant pipeline (9), two conduits are communicated between the outdoor radiator (12) and the liquid accumulator (10), and a one-way valve (13) and an electronic expansion valve two (19) are connected in series on the two conduits, respectively, the inlet of the outdoor radiator (12) is communicated with the evaporator (14) through a conduit, the pipeline connecting the evaporator (14) and the outdoor radiator (12) is communicated with the inlet of the gas-liquid separator (2), an electromagnetic valve one (20) is arranged on the pipeline connecting the evaporator (14) and the outdoor radiator (12), another port of the evaporator (14) is communicated with the liquid accumulator (10), an electronic expansion valve three (15) is connected in series on the conduit connecting the evaporator (14) and the liquid accumulator (10), and the battery refrigerant inlet and outlet of the plate heat exchanger (1) are connected with a battery temperature control system.

2. The high-efficiency heat pump system for a new energy vehicle according to claim 1, characterized in that: An exhaust temperature sensor (6) is arranged on the outlet of the electric compressor (4).

3. The high-efficiency heat pump system for a new energy vehicle according to claim 1, characterized in that: Temperature detection pieces are arranged on the outdoor radiator (12), the evaporator (14) and the indoor condenser (7).

4. The high-efficiency heat pump system for a new energy vehicle according to claim 1, characterized in that: The battery temperature control system comprises a kettle (16), the inlet of the kettle (16) is connected with the battery cooling liquid outlet of the plate heat exchanger (1) through a pipeline, the outlet of the kettle (16) is connected with the inlet of a water pump (17) through a pipeline, the outlet of the water pump (17) is connected with the cooling liquid inlet of a battery cooling machine set (18) through a pipeline, and the cooling liquid outlet of the battery cooling machine set (18) is connected with the battery cooling liquid inlet of the plate heat exchanger (1) through a pipeline.

5. The high-efficiency heat pump system for a new energy vehicle according to claim 4, characterized in that: Temperature detection pieces are arranged on the battery cooling liquid outlet and inlet of the plate heat exchanger (1).

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