Auto-cascading refrigeration cycle system and refrigeration cycle method both synergized by using double injectors

Abstract

The invention discloses an auto-cascading refrigeration cycle system and a refrigeration cycle method both synergized by using double injectors. The system includes a compressor, a condenser and a gas-liquid separator I of which the inlets are connected sequentially. The saturated gas generated by the gas-liquid separator I sequentially passes through an evaporative condenser I, an evaporative condenser II and a throttling mechanism to enter an evaporator so that refrigeration can be realized. The refrigerant leaves the evaporator and enters a gas-liquid separator II, the obtained saturated liquid is injected into an injector II and then enters the evaporative condenser II after mixed and boosted with the saturated liquid from the gas-liquid separator I. The saturated gas generated by thegas-liquid separator II is injected into an injector II by another saturated liquid from the gas-liquid separator I, and then mixed with working medium from the evaporative condenser II after mixed and boosted. The saturated gas then enters the evaporative condenser I and becomes superheated gas after heat absorption. Then the gas returns to the compressor to realize a complete refrigeration cycle. The cycle can be adapted to variable load operation of a system and can improve injector operational stability to improve system performance.

Description

technical field [0001] The invention belongs to the technical field of refrigeration of refrigerators and freezers, and in particular relates to a self-cascading refrigeration cycle system and a refrigeration cycle method using double injectors to increase efficiency. technical background [0002] In recent years, with the rapid growth of the national economy and the gradual improvement of people's living standards, many fields such as medical treatment, food industry, refrigeration and various new technology products have put forward new requirements for low-temperature refrigeration technology, especially for temperatures below -40°C. The demand for refrigeration temperature is getting stronger and stronger, and the requirement for realizing low temperature technology below -40°C is also increasing day by day. At present, the ways to achieve low-temperature refrigeration mainly include: multi-stage cascade refrigeration, mixed refrigerant throttling refrigeration, self-cas...

AI Technical Summary

Problems solved by technology

However, in the actual operation process, the load adaptability of the fixed-structure single injector is poor, which will cause the injector to fail to meet the changes of the system working conditions and cause boosting failure or drainage failure. Therefore, the exploration of the injector load adjustment method is one of the research hotspots. one

Secondly, due to the complete evaporation of the non-azeotropic working fluid in the evaporator, it will cause a huge temperature glide, but due to the limitation of the refrigeration temperature, the refrigerant cannot be completely evaporated in the evaporator, and the outlet of the evaporator is usually in a two-phase state, so In fact, it will reduce the working stability of the injector, and even cause the boost or drainage to fail

At present, there is still a lack of methods for improving the operation stability and performance of self-cascading refrigeration systems using dual ejectors.

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