Pneumatic split Stirling expander and its refrigerator

Abstract

The invention discloses a pneumatically-driven type Stirling expansion engine which is used for a Stirling refrigerating machine. The pneumatically-driven type Stirling expansion engine comprises a base, a discharger component and a cold finger; a locating pin and a base air hole are arranged on and formed in the two sides in the base respectively; the discharger component comprises a pneumatic piston, a pneumatic air cylinder, a spring, a ball joint and a cool storage device; one end of the ball joint is connected with the pneumatic piston; the other end of the ball joint is connected with the cool storage device; one end of the spring is connected with the pneumatic air cylinder; the other end of the spring is connected with the pneumatic piston; a locating hole and an air cylinder air hole that are matched with the locating pin and the base air hole are formed in the two sides of the pneumatic air cylinder; and the cold finger is connected with the base and high pressure sealing is realized through a metal sealing ring. The reliability and the life of the refrigerating machine are improved and prolonged, and the requirements on the processing and assembly precision of parts are lowered.

Description

technical field [0001] The invention relates to the technical field of refrigeration and low temperature, in particular to a pneumatic split Stirling expander and a refrigerator thereof. Background technique [0002] The separated Stirling refrigerator separates the compressor and the expander, and the layout is flexible, especially suitable for applications with high space requirements. At the same time, the separated refrigerator can effectively reduce the vibration of the compressor to the cold head, so it is getting more and more attention. more extensive research. Split Stirling refrigerator expanders are divided into electric drive type and pneumatic type according to the drive mode. The pneumatic expander does not contain a motor, and has the advantages of simple and compact structure, small size and light weight. At present, most of the small split Stirling refrigerators are pneumatic expander structures. [0003] The expander displacer of the pneumatic split Stirl...

AI Technical Summary

Problems solved by technology

But in fact, due to parts processing and assembly errors, it is difficult to achieve coaxiality between the ejector and the cold finger cylinder, and the ejector will always be biased to the side of the cold finger cylinder, which will lead to increased mechanical friction and damping during movement, especially in vibration shock Under the condition, the increase of mechanical frictional damping is more obvious

For the pneumatic Stirling refrigerator, the increase of the frictional damping of the ejector will reduce the stroke of the expander, and the phase angle will deviate from the optimal value, thus deteriorating the performance of the refrigerator

At the same time, the increase of damping will also increase the wear of the ejector, greatly reducing the reliability and life

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