A phase-change wave rotor self-cascading refrigeration system and its working method

Abstract

A phase change wave rotor self-cascading refrigeration system and its working method belong to the technical field of mechanical refrigeration. The supercharging device of the phase-change wave rotor self-cascading refrigeration system is composed of a phase-change wave rotor supercharger and a steam compressor, which can make full use of the unsteady supercharging characteristics of the phase-change wave rotor and the ability to carry liquid droplets, thereby effectively reducing the Compressor pressure ratio to achieve the purpose of low temperature rise and pre-charging. After the refrigerant is pre-charged by the phase change wave rotor supercharger, it is divided into low-temperature and high-temperature refrigerants through the steam compressor and condenser: the low-temperature refrigerant is cooled by the self-cascade supercooler, and then throttled by low temperature The valve and evaporator complete the refrigeration process, and then enter the low-pressure steam inlet of the phase-change wave rotor supercharger; the high-temperature refrigerant enters the drive steam inlet of the phase-change wave rotor supercharger after passing through the high-temperature throttle valve and self-cascade supercooler. The system can use single or mixed refrigerants for refrigeration cycle, and has the advantages of simple structure and wide application range compared with conventional cascade refrigeration systems.

Description

technical field [0001] The invention relates to a phase change wave rotor self-cascading refrigeration system and a working method thereof, belonging to the technical field of mechanical refrigeration. Background technique [0002] With the rapid development of the national economy, the demand for lower temperatures is getting higher and higher. At present, the single-stage vapor compression refrigeration cycle can no longer meet the requirements in the case of obtaining lower temperatures, and the cascade refrigeration cycle has been widely used. However, the classic cascade refrigeration system will make the system structure complex and cost increase with the increase of cascade stages. Compared with the traditional cascade refrigeration system, the self-cascade system, as a special cascade system, has the advantages of simple structure, high reliability, and low cost. However, the simple mixing of high-temperature refrigerant and low-temperature refrigerant in the self-...

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Problems solved by technology

However, the simple mixing of high-temperature refrigerant and low-temperature refrigerant in the self-cascading system before compression cannot achieve sufficient low-temperature boosting effect, resulting in excessive pressure ratio of single-stage compressors, high exhaust temperature, and reduced refrigeration performance. question

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