Pulse tube cryocooler

Abstract

The invention is to prevent the poor efficiency of a pulse tube cryocooler. A pulse tube cryocooler (10) includes: a pulse tube (16) having a pulse tube high-temperature end (16a) and a pulse tube low-temperature end (16b), and extending in an axial direction (A) from the pulse tube high-temperature end (16a)to the pulse tube low-temperature end (16b); a regenerator (18) having a regenerator high-temperature end (18a) and a regenerator low-temperature end (18b), and being disposed rowed alongside the pulse tube (16), with the regenerator high-temperature end (18a) being positioned displaced, in terms of the axial direction (A), from the pulse tube high-temperature end (16a) toward the cryocooler low-temperature side, and the regenerator low-temperature end being fluid-passage linked with the pulse tube low-temperature end; and a pressure-switching valve (26) for connecting the regenerator high-temperature end to a compressor discharge port (12a) and to a compressor suction port (12b) in alternation to generate pressure oscillation inside the pulse tube, and being disposed between the pulse tube high-temperature end and the regenerator high-temperature end in terms of the axial direction.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2018-010880 filed on January 25, 2018. The entire content of the application is incorporated in this specification by reference. [0002] The invention relates to a pulse tube refrigerator. Background technique [0003] Pulse tube refrigerators are roughly divided into two types according to the configuration of the pulse tube and cold storage. One is that the low temperature end of the pulse tube and the regenerator communicate with each other through a short linear flow path, and the pulse tube and the regenerator respectively extend to opposite sides from the flow path. Since the pulse tube is connected in series with the regenerator, it is also called straight type. The other is that the low temperature end of the pulse tube and the regenerator communicate with each other through a bent flow path, and the pulse tube and the regenerator extend from the flow path to the same...

AI Technical Summary

Problems solved by technology

Especially in pulse tube refrigerators with high cooling capacity, the axial length of the regenerator may become very short compared to the axial length of the pulse tube

[0007] The inventors of the present invention found that if there is such a difference in axial length between the pulse tube and the regenerator in the conventional parallel arrangement type pulse tube refrigerator, heat loss may occur in the regenerator during the cooling operation of the pulse tube refrigerator.

This heat loss leads to a decrease in the efficiency of the cold storage, which in turn reduces the efficiency of the chiller, so it is not ideal

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