Regenerative type refrigerator

Abstract

The invention discloses a regenerative type refrigerator. The regenerative type refrigerator can reduce amount of lubricant which flows from an inner space of a bearing member, reduce amount of foreign matter which mixes into the inner space of the bearing member, and prevent sealing members of the bearing member from deforming. The regenerative type refrigerator includes a cylinder expanding a refrigerant gas; a regenerator accumulating cold thermal energy and being provided inside the cylinder so as to be reciprocate inside the cylinder; a rotary drive portion generating driving force; a rotary member (31a) being rotated by the rotary drive portion; and a bearing member supporting the rotary member (31a) and including an inner wheel (61) and an outer wheel (62) which are arranged to rotate relative to each other around a same rotation shaft (RA), and two sealing members (63-1,63-2) disposed on two sides of the outer wheel and the inner wheel along the rotation shaft (RA), wherein the sealing members are fixed to one of the inner wheel member (61) and the outer wheel member (62), and a gap (G) is formed between the two sealing members (63-1,63-2) and another one of the inner wheel member (61) and the outer wheel member (62).

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2011-132506 filed on June 14, 2011. The entire content of its application is incorporated in this specification by reference. [0002] The present invention relates to a regenerator-type refrigerator that stores cold energy generated by expanding refrigerant gas in a regenerator. Background technique [0003] As a cryogenic refrigerator for obtaining a cryogenic temperature of about 4K, for example, a Gifford-McMahon (GM) refrigerator is used. [0004] The GM refrigerator generates cold energy by supplying a refrigerant gas composed of, for example, helium from a compressor to an expansion space formed in a cylinder and expanding the supplied refrigerant gas in the expansion space. [0005] Each stage of the GM refrigerator has a cylinder and a displacer installed in the cylinder. The displacer is reciprocally arranged in the cylinder, and an expansion space is formed between ...

AI Technical Summary

Problems solved by technology

Moreover, as the pressure outside the bearing component fluctuates, a large pressure difference occurs between the inner space of the bearing component and the outside, and the sealing member may be deformed due to a large force due to the generated pressure difference.

[0012] Furthermore, the above-mentioned problems are not limited to GM refrigerators, but are common to various regenerator-type refrigerators that include a regenerator and include a regenerator that stores cold energy generated by expanding refrigerant gas in the regenerator.

Images