Ejector expansion auto-cascade refrigeration circulation system and work process

Abstract

The invention discloses an ejector expansion auto-cascade refrigeration circulation system and a work process. The system comprises a compressor, a condenser, an ejector, a gas and liquid separator, athrottling valve, an evaporator, a backpressure valve and an evaporation cooler which are connected on a pipeline; the ejector takes condenser outlet high-pressure non-azeotropy mixture refrigerationagent gas and liquid two-phase fluid as work fluid, an evaporator outlet low-pressure refrigeration agent is ejected, a two-phase refrigerant obtained after mixed pressure rise enters the gas and liquid separator through an ejector outlet to be separated into the liquid state and the gas state, a gas outlet of the gas and liquid separator is divided into two paths, one path is connected with an air suction pipeline of the compressor, and the other path is connected with a condensation channel inlet of the evaporation condenser; a liquid outlet of the gas and liquid separator is connected withthe backpressure valve, and the backpressure valve adjusts the flow and the pressure of the refrigeration agent of the evaporation condenser by sensing the liquid outlet pressure of the gas and liquid separator. The ejector and the backpressure valve are effectively arranged in the auto-cascade refrigeration circulation system, the ejector expansion power recycling effect and the system dynamic adjusting effect can be sufficiently improved, and the refrigeration efficiency of the auto-cascade refrigeration circulation system can be efficiently improved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and low temperature, and in particular relates to an efficient ejector expansion self-cascading refrigeration cycle system and its working process. Background technique [0002] With the continuous development of medical, biological and industrial technologies, the demand for low-temperature refrigeration technology applications has become more and more extensive. At present, the low-temperature refrigeration methods used to obtain a low-temperature environment below -40°C mainly include: multi-stage vapor compression refrigeration, mixed refrigerant throttling refrigeration, cascade refrigeration and self-cascade refrigeration. [0003] The self-cascading refrigeration system uses binary or multi-component non-azeotropic mixture refrigerants to realize multi-stage automatic cascade refrigeration cycle by using only one vapor compressor to obtain the required low-temperature refrigeration. ...

AI Technical Summary

Problems solved by technology

However, at present, methods for applying ejectors to self-cascading refrigeration systems are still relatively lacking, and existing technical solutions are not enough to improve energy efficiency

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