Multi-stage U-shaped gas coupling pulse tube refrigerator connecting tube type heat exchanger and implementation method

Abstract

The invention discloses a multi-stage U-shaped gas coupling pulse tube refrigerator connecting tube type heat exchanger and an implementation method. A cold end heat exchanger comprises a heat exchanger shell, a connecting tube, a first conical slit body, a first through hole, a laminar flow element, a second conical slit body, and a second through hole. Conical slits are cut in the left and right sides of the heat exchanger shell, respectively, the two parts communicate through a welding connecting pipe, and meanwhile a first-stage regenerator, a second-stage regenerator and a first-stage pulse tube are connected. While the advantage of efficient heat exchange of a traditional heat exchanger is kept, efficient matching of a front-stage cold finger and a rear-stage cold finger of the pulse tube refrigerator is achieved, backflow, mixed flow and turbulent flow disturbance of a gas working medium in a heat exchange channel are restrained, and gas flowing uniformity is guaranteed. According to the invention, the heat exchange efficiency and the overall performance of the pulse tube refrigerator are remarkably improved, and the multi-stage pulse tube refrigerator has very positive significance in the aspects of achieving compactness and practicability of the multi-stage pulse tube refrigerator and obtaining extremely low temperature.

Description

technical field [0001] The invention belongs to the field of refrigeration and low temperature engineering, and relates to a pulse tube refrigerator, in particular to a multi-stage U-shaped air-coupled pulse tube refrigerator connected-pipe cold-end heat exchanger and a realization method. Background technique [0002] The pulse tube refrigerator is a major innovation of the regenerative cryogenic refrigerator. It cancels the moving parts of the conventional regenerative refrigerator in the low temperature area, and has the advantages of high reliability, small mechanical vibration, long working life, high refrigeration efficiency, With outstanding advantages such as low electromagnetic noise, it is recognized as a new generation of long-life regenerative cryogenic refrigerators, and has been widely used in aerospace, low-temperature electronics, superconducting industry and low-temperature medical industry. [0003] According to the relationship between the cold accumulator...

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Problems solved by technology

For the U-shaped arrangement of cold fingers, there is also a pressure loss caused by the flow direction of the gas working medium being reversed by 180°, which requires a coherent and compact flow channel structure to reduce the void vo

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