Electric automobile secondary loop heat pump air conditioning system capable of preventing frosting

A secondary circuit, electric vehicle technology, applied to vehicle components, air handling equipment, heating/cooling equipment, etc., can solve the problem of frosting of outdoor heat exchangers, poor operating conditions, and unfavorable system reliability, etc. problems, to achieve the effects of reducing the temperature difference between the main road and the environment, low production costs, high heating capacity and heating energy efficiency

Pending Publication Date: 2021-11-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This defrosting method requires a long defrosting time, and the operating conditions are not good, and there will be a risk of compressor liquid shock in some low temperature conditions, which is extremely harmful to system reliability.
However, this prior art cannot solve the frosting problem of the outdoor heat exchanger of the electric vehicle heat pump system

Method used

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  • Electric automobile secondary loop heat pump air conditioning system capable of preventing frosting
  • Electric automobile secondary loop heat pump air conditioning system capable of preventing frosting
  • Electric automobile secondary loop heat pump air conditioning system capable of preventing frosting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, it is a secondary circuit heat pump air-conditioning system for electric vehicles that prevents frosting in this embodiment. Switching between dehumidification heating mode and defrosting mode, which includes: compressor 1 connected in sequence, first heat exchanger 2, first throttle valve 3 for throttling expansion, secondary loop water circulation system 19, The second throttle valve 9 for throttling expansion, the second heat exchanger 3 and the gas-liquid separator 5, as well as the first solenoid valve 6 and the second solenoid valve 8 for switching the refrigerant flow path, and are used for regulating the compartment The temperature and humidity inside the air conditioning box 18, wherein: the first solenoid valve 6 is connected in parallel to both ends of the first throttle valve 7 for controlling the on-off of the first throttle valve 7, and the second solenoid valve 8 is connected in parallel to The two ends of the second throttle v...

Embodiment 2

[0036] Such as Figure 4 As shown, the refrigeration mode is: the first solenoid valve 6 is set to be in the open state, the first throttle valve 7 is set to be in the fully closed state, the second solenoid valve 8 is set to be in the closed state, and the second throttle valve is set to be in the closed state. 9 is set to be in a throttling state, the heating and cooling air door 15 is set to be in an open state, and the air to be blown into the passenger compartment directly flows through the side channel without passing through the first heat exchanger 2 .

[0037] In the cooling mode, the refrigerant main circuit circulation path is: the high-temperature and high-pressure refrigerant compressed by the compressor 1 enters the first heat exchanger 2 without heat exchange, and then flows through the outlet of the first heat exchanger 2 After the first solenoid valve 6 enters the interior of the battery cooler 4, it exchanges heat with the low-temperature water on the water s...

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PUM

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Abstract

The invention discloses an electric automobile secondary loop heat pump air conditioning system capable of preventing frosting. The system comprises a compressor, a first heat exchanger, a first throttling valve, a secondary loop waterway circulation system, a second throttling valve, a second heat exchanger, a gas-liquid separator, a first electromagnetic valve, a second electromagnetic valve and an air handling unit which are cyclically connected in sequence; and the secondary loop waterway circulation system comprises a battery cooler, a water tank, a motor, an expansion kettle, a water pump and an outdoor condensate fan which are sequentially and circularly connected. The air handling unit comprises a fan used for conveying air, a cold and warm air door and an internal and external circulation air door used for switching air guided into the passenger compartment. The secondary loop waterway circulation system is added to replace an outdoor heat exchanger, so that the temperature difference between the refrigerant temperature and the outside temperature is reduced; and switching between a refrigerant flow channel and a working mode is achieved only through control of two electromagnetic valves and the throttling valves, the heat exchange effect, the low-temperature heating performance and the high-temperature refrigeration performance of the system are improved, and the effect of preventing frosting is achieved.

Description

technical field [0001] The invention relates to a technology in the field of automobile air conditioning, in particular to an electric vehicle secondary circuit heat pump air conditioning system for preventing frost formation. Background technique [0002] Conventional vehicle heat pump air conditioning system, in low temperature environment and high temperature environment, due to the large temperature difference between the refrigerant temperature in the outdoor heat exchanger and the outdoor air temperature, the heat transfer efficiency in the outdoor heat exchanger is low, and the amount of heat transfer is small , the required heat exchange effect cannot be achieved, resulting in poor low-temperature heating performance and high-temperature cooling performance of the system, which cannot meet the heating and cooling requirements of the passenger compartment. In addition, the heating and cooling performance of the automotive heat pump air-conditioning system often requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60H1/00B60H1/04
CPCB60H1/00007B60H1/00278B60H1/00321B60H1/04B60H2001/00307
Inventor 李万勇刘雨声陈江平施骏业
Owner SHANGHAI JIAO TONG UNIV
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