Air-conditioning heat pump system for electric cars

Abstract

The invention provides an air-conditioning heat pump system for electric cars. The air-conditioning heat pump system comprises a compressor (1), a four-way valve (2), an outdoor air-cooled heat exchanger (3) with an outdoor fan (4), a one-way valve set, a throttle flow path with a main throttle element (9), and an indoor air-cooled heat exchanger (10) with an indoor fan (11). Therefore, the air-conditioning heat pump system is provided with a refrigerating mode and a first heating mode respectively. The compressor (1) comprises an air supplement inlet (1'). The air-conditioning heat pump system further comprises an air supplement flow path with an air supplement device. One end of the air supplement flow path, in front of the main throttle element, is connected to the throttle flow path, and the other end of the air supplement flow path is connected to the air supplement inlet, so that air hotter and more pressurized than low-temperature low-pressure air is selectively supplied to the compressor so as to achieve a second heating mode.

Description

technical field [0001] The invention relates to the field of air-conditioning heat pumps, in particular to an air-conditioning heat pump system for electric vehicles. Background technique [0002] Automobile air conditioning system is an important guarantee system to ensure the comfort of drivers and passengers in the car. The traditional fuel car air conditioning system is driven by the car engine. It consumes fuel to provide the power required by the air conditioning system, and cools the car in summer; in winter, it uses the waste heat of the engine to heat the car. Electric vehicles are all or part of the vehicles that use electricity as the power source of the drive system, especially pure electric drive electric vehicles. Since there is no waste heat from the engine that can be used, how to solve the winter heating problem of electric vehicles is very important. [0003] At present, electric vehicles mainly use PTC (positive temperature coefficient) electric heating f...

AI Technical Summary

Problems solved by technology

For example, in Chinese Patent Publication No. CN101324382A, an automobile heat pump air-conditioning system is disclosed, which improves the original air-conditioning heat pump system. Specifically, a check valve group composed of four check valves is added. And replace the two-way expansion valve in the original air-conditioning heat pump system with an ordinary expansion valve to try to solve the unbalanced cooling and heating of the original two-way expansion valve system

[0004] However, when the outside temperature of the ordinary air source heat pump is low, the exhaust temperature of the compressor is too high, causing the system to fail to work normally. Moreover, as the outside temperature drops, the heating capacity and heating efficiency of the heat pump system drop rapidly, which cannot meet the needs of the vehicle. Internal heating requirements, which affect the application of air source heat pumps in electric vehicle air conditioning systems

However, previous vehicle heat pump air-conditioning systems including the above-mentioned disclosed documents cannot cope with this situation well.

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