Supersonic speed two-phase expansion multi-stage low-temperature refrigerating system and refrigerating machine

Abstract

The invention provides a supersonic speed two-phase expansion multi-stage low-temperature refrigerating system and a refrigerating machine. The supersonic speed two-phase expansion multi-stage low-temperature refrigerating system comprises a plurality of refrigerating units, each refrigeration unit comprises a countercurrent heat exchanger, a supersonic speed two-phase expansion machine connected with the countercurrent heat exchanger, at least one evaporator connected with the supersonic speed two-phase expansion machine, a compressor connected with the countercurrent heat exchanger and a cooler connected with the compressor and the countercurrent heat exchanger; and a refrigeration working medium flows through the plurality of refrigeration units for multi-stage refrigeration so as to reach a low-temperature area. In this way, the supersonic speed two-phase expansion machine is arranged as an expansion cooling device, and the beneficial effects of being high in expansion refrigeration efficiency, small in pressure drop, low in energy consumption, simple and compact in structure, free of moving parts, safe, reliable and low in machining difficulty are achieved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a supersonic two-phase expansion multistage low-temperature refrigeration system and a refrigerator. Background technique [0002] With the rapid development of my country's national economy and the continuous improvement of people's living standards, there are more and more applications of low temperature, refrigeration and heat pump products. Low temperature and refrigeration technology has improved people's quality of life, but environmental problems caused by leakage of various refrigerants It is also becoming more and more serious. The promotion and application of environmentally friendly refrigerants is of great significance for energy conservation and emission reduction and the promotion of sustainable social development. At present, the development history of refrigerants is mainly divided into four stages: the first-generation refrigerants are represented by natural...

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Problems solved by technology

[0004] The embodiment of the present invention provides a supersonic two-phase expansion multi-stage low-temperature refrigeration system, which is used to solve the hidden dangers of unreliable and unstable operation of the expander in the prior art, which has high-speed rotating mechanical moving parts, is difficult to process, and cannot be brought Technical problems with liquid work

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