Multistage Stirling refrigerating machine

Abstract

The invention provides a multistage Stirling refrigerating machine. A Stirling reversible heat engine is utilized to serve as a refrigerating machine, and multiple stages of refrigerating machines are connected in series coaxially. Two working cavities, the phase difference of which is pi, of two adjacent stages are communicated with two heat exchange passages of the same interstage heat exchanger, so that reliable transmission of heat of two stages is realized. Two working cavities, the phase difference of which is pi, of the same stage are communicated with two heat exchange passages of the same regenerator, so that rational use of heat is achieved. The enclosed space of an operating condition controller is communicated with a two-stage seal cavity, and all the working cavities have the same lowest working pressure, so that well-balanced running of the whole machine is ensured. The number of stages of the refrigerating machine and refrigerating power can be determined according to requirements, so that the refrigerating machine can satisfy various requirements of refrigerating depth and refrigerating capacity. The refrigerating machine has the advantages that the refrigerating process is simple; less equipment is required; the cost is lower; the refrigerating machine can be used in a large air or natural gas liquefaction plant, and is suitable in a mobile vehicle-mounted refrigerating station, so that marsh gas and coal mine methane gas are subjected to liquefaction treatment.

Description

Technical field [0001] The invention relates to a Stirling refrigerator, in particular to a multistage Stirling refrigerator. Background technique [0002] With the advancement of science and technology, deep refrigeration technology is playing an increasingly important role in some industries. Industries such as aerospace, food processing, medical and health care, fertilizer production, natural gas storage and transportation, and petroleum refining are all inseparable from deep refrigeration technology. The current deep refrigeration technology scheme mainly uses the Linde cycle to realize deep refrigeration through multi-stage compression and throttling expansion. [0003] Natural gas storage and transportation is a representative industry applying deep refrigeration technology. The vast majority of LNG products come from large-scale natural gas liquefaction plants, which are used for natural gas peak shaving and natural gas shipping trade. The micro-LNG liquefaction de...

AI Technical Summary

Problems solved by technology

However, the Stirling reversible heat engine cannot reach the deep cooling temperature (below -100°C) when used as a refrigerator.

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