Refrigerating system with ejector and refrigerating method thereof

Abstract

The invention discloses a refrigerating system with an ejector. The main trend of ejectors is that: a working medium becomes a gaseous working medium through an expansion valve, and the gaseous working medium from an evaporator enters the ejector for pressure expanding through injection, so that the pressure of the working medium is improved; and the working medium is compressed in a compressor and enters a condenser to finish a refrigerating cycle. However, according to the invention, a liquid working medium passing through the expansion valve is continuously throttled through another expansion valve to have a low-temperature low-pressure state, is evaporated in the evaporator, becomes a gaseous working medium through heat absorption to be ejected into the ejector, is pressurized in the ejector and enters the condenser to finish a refrigerating cycle. Therefore, the pressure of the working medium in the compressor is improved, a pressure ratio of the compressor is reduced, and the power consumption of the compressor is reduced, so that the efficiency of the refrigerating system is improved.

Description

technical field [0001] The invention relates to an evaporation compression refrigeration system, in particular to an evaporation compression refrigeration system comprising an ejector. The invention also relates to a refrigeration method using the refrigeration system. Background technique [0002] Most of the existing refrigeration systems are composed of four major components: compressor, condenser, expansion valve, and evaporator. After being compressed by the compressor, the gaseous refrigerant enters the condenser to condense into a high-pressure and high-temperature liquid, and then expands through the expansion valve. After that, it becomes a low-temperature and low-pressure two-phase fluid, and then enters the evaporator to evaporate, absorbs the heat of the fluid outside the evaporator to vaporize, and then enters the compressor to complete a cycle. During the cycle of the refrigerant, the refrigerant from the outlet of the condenser The process of the liquid state...

AI Technical Summary

Problems solved by technology

There are many similar patents on the application of ejectors in refrigeration systems. The main function of ejectors is to completely or partially replace the expansion valve, reduce throttling losses, and improve the efficiency of refrigeration systems. However, since the mainstream fluid at the inlet of the ejector is Liquid refrigerant, in the expansion process of the nozzle, there will be a metastable flow phenomenon, which will reduce the efficiency of the nozzle, and the refrigerant will easily generate shock waves during the mixing and diffusion process in the ejector, which will reduce the efficiency of the ejector. Now and there is no good way to solve this problem

Moreover, as the external working conditions change, the performance of the ejector will also be affected, thereby affecting the stability of the refrigeration system and causing great trouble to the control of the cooling capacity of the refrigeration system.

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