Electric vehicle heat pump type air conditioning system with ejector

Abstract

The invention discloses an electric vehicle heat pump type air conditioning system with an ejector. A first four-way reversing valve and a second four-way reversing valve are separately arranged in the system as a refrigerant flow path switching valve group, and the ejector with a double-loop form is used for recovering expansion work in the throttling process, and the operation of the system in different modes of cooling, heating and defrosting is achieved. The electric vehicle heat pump type air conditioning system with the ejector adopts the ejector to realize the expansion work recovery inthe throttling process, and simultaneously increases the suction pressure of a compressor, thereby improving the refrigeration and heating capacity of the system as well as the refrigeration and heating efficiency; and the electric vehicle heat pump type air conditioning system with the ejector especially solves the problem of too low suction pressure of the operation of a heat pump under the lowtemperature working condition, and increases cycle economy.

Description

technical field [0001] The invention relates to an electric vehicle air conditioning system, in particular to an electric vehicle heat pump air conditioning system with an ejector. Background technique [0002] The demand for energy in today's society is increasing, and the requirements for environmental protection are also getting higher and higher. The global energy crisis is intensifying, and environmental protection issues are becoming more and more prominent. Energy-saving and environment-friendly electric vehicles have become the development direction of future automobile industrialization. Air-conditioning performance, which is one of the car comfort indicators, has also become the basic requirement of modern car consumers. [0003] At present, electric vehicle heating mainly adopts PTC material heating technology, but its energy consumption is relatively high, which greatly reduces the cruising range of the vehicle. Therefore, this technique is not the most efficie...

AI Technical Summary

Problems solved by technology

However, the irreversible loss caused by throttling of traditional air source heat pump air conditioners greatly affects the efficiency of the cycle.

And when it is used for heating in cold and humid areas in winter, if the outside temperature is too low, the heat decay of the system will be fast, and the heating capacity will be insufficient.

In addition, on the one hand, if the evaporation pressure is too low, the compression ratio of the system will increase, resulting in an increase in the exhaust gas temperature; on the other hand, the outdoor heat exchanger is prone to frost under low temperature conditions, which will affect the air conditioning heat pump system safety and reliability

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