Secondary intermediate heat exchanger for thermal coupling coaxial two-stage pulse pipe refrigerator and design method

Abstract

The invention discloses a secondary intermediate heat exchanger for a thermal coupling coaxial two-stage pulse pipe refrigerator and a design method. The heat exchanger is of a structure which is machined through a hollow high-heat-conductivity material and is approximate to a column shape, and conical slit bodies are arranged in the middle. The slit bodies are of trapezoidal fin structures arranged on the circumference uniformly. The inner hole diameter of each slit body is equal to the diameter of a pulse pipe, the outer diameter of the upper end of each slit body is equal to the inner diameter of a regenerator of the low-temperature section, and the outer diameter of the lower end of each slit body is equal to the inner diameter of a regenerator of the high-temperature section. According to the secondary intermediate heat exchanger, conical slits are uniformly machined in the portions of unequal diameters, maximization of the heat exchange area in the limit size is achieved, the machining manner transits naturally from the large-diameter end to the small-diameter end, and the flow loss is minimized. The secondary intermediate heat exchanger can effectively improve the overall performance of the thermal coupling coaxial two-stage pulse pipe refrigerator.

Description

Technical field [0001] The invention relates to a two-stage pulse tube refrigerator, in particular to a two-stage intermediate heat exchanger of a thermally coupled coaxial type two-stage pulse tube refrigerator and a design method. Background technique [0002] The pulse tube refrigerator in the 20-50K temperature zone generally adopts a two-stage structure. The airflow of the first-stage cold finger and the second-stage cold finger of the thermally coupled two-stage pulse tube refrigerator is independent of each other, and can be driven by the same compressor or by two The compressors are driven separately, and the cooling capacity of the primary cold finger is transferred to the intermediate heat exchanger in the middle section of the secondary cold finger through the thermal bridge to pre-cool the secondary cold finger and also provide external cooling capacity. The cold finger working gas is reheated through the high-temperature section regenerator, the intermediate heat exc...

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Problems solved by technology

[0007] The object of the present invention is to design an intermediate heat exchanger in the second stage of a thermally coupled coaxial two-stage pulse tube refrigerator to solve the problem of efficient heat transfer and precooling of the first-stage cold finger to the middle part of the second-stage cold finger, and the internal cooling of the second-stage cold finger. The problem of excessive flow loss at variable cross-section

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