Two-phase flow injector replacing refrigerator throttling element

Abstract

Injector in two-phase flow includes step motor, adjustable valve body, nozzle, case of injector, adaptor of injection liquid, air intake cavity, mixing chamber and pressure expansion chamber etc. In nozzle, refrigerant agent is quickened up continuously so as to reduce pressure in the air intake cavity. Thus, gaseous refrigerant agent from evaporator is injected to the air intake cavity. Then, gaseous refrigerant agent and liquid in main flow from condenser are mixed in the mixing chamber. Pressure expansion is carried out in pressure expansion chamber, and mixed flow outflows from case of injector. Mixing liquid in main flow with injection liquid is carried out under approximate equi-pressure. The pressure expansion chamber is designed based on theory of equal flow of momentum rate so as to raise efficiency of injector. Features are: few moving parts, raised efficiency of system about 5úÑ-20úÑ.

Description

technical field [0001] The invention relates to an ejector, especially a two-phase flow ejector whose mainstream fluid at the inlet of the ejector is liquid refrigerant and whose cooling capacity can be adjusted, and which is used to replace the throttling element of a refrigerator, which belongs to refrigeration [0002] technology field. Background technique [0003] Most of the existing refrigerators are composed of four parts: 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. It becomes a low-temperature and low-pressure two-phase fluid, 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 refrigerant cycle, the refrigerant is in a liquid state at the outlet ...

AI Technical Summary

Problems solved by technology

Since the mainstream fluid at the inlet of the injector is liquid refrigerant, a metastable flow phenomenon will appear during the expansion process in the nozzle, which will reduce the efficiency of the nozzle. This invention does not take measures to eliminate the metastable flow, and the mixing chamber of the invention is Cylindrical, the diffuser chamber is in the shape of a truncated cone, and shock waves are likely to be generated during the mixing and diffusion of the refrigerant, which reduces the efficiency of the ejector

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