Cold finger cold plate structure of Stirling cryocooler

Abstract

The invention relates to a cold finger cold plate structure of a Stirling cryocooler. The cold finger cold plate structure comprises an air cylinder and a cold plate structure, wherein the cold platestructure is embedded into an opening in the end part of the air cylinder; the cold plate structure comprises a base body and a conduction plate which are coaxially arranged, and the conduction plateis connected in the middle of the base body in an embedded mode; let the pressure on the air cylinder side of the cold plate structure be P1 and the pressure on the other side be P2, let the diameterof the air cylinder side of the conduction plate be D1 and the diameter of the other side of the conduction plate be D2, and if P1 is greater than P2, D1 is greater than D2; and let the side surface of the conduction plate be an S surface, and the S surface is one conical surface, a plurality of stepped conical surfaces or a plurality of stepped cylindrical surfaces. According to the technical scheme of the cold finger cold plate structure, under the condition that manufacturing is not carried out any more after the cold plate structure and the air cylinder base body are welded, the influenceof welding on the form and position tolerance of the air cylinder base body can be greatly reduced, and the requirement for high form and position tolerance of the air cylinder base body can be met. The cold finger cold plate structure has the advantage that the form and position tolerance of a cold finger air cylinder structure can be guaranteed, and meanwhile, the cold loss can be reduced to themaximum degree.

Description

technical field [0001] The invention relates to the technical field of Stirling refrigerators, in particular to a Stirling refrigerator cold finger cold plate structure applied in the field of infrared detection. Background technique [0002] The performance of a Stirling refrigerator depends on parameters such as compressor volume, stroke, expansion volume, push stroke, mover mass, damping coefficient, stiffness, inflation pressure, gap loss, etc. In order to ensure that the design parameters can be realized, the compression cylinder, compression The requirements for shape and position tolerances such as cylindricity and coaxiality of pistons, expansion cylinders and push pistons are very high. The cold finger of the Stirling refrigerator is a thin-walled tubular structure with a single-sided blind plate. In order to meet the requirements of shape and position tolerances, the cold finger adopts a structural form of a combination of a thin-walled tubular structure and a bl...

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Problems solved by technology

However, there are large differences in properties between dissimilar metals, so welding dissimilar metals is usually much more difficult than welding the same metal: when the melting temperature difference between the two metals to be welded is large (such as iron and silver or tungsten), one of the metals is already in the When the two metals have a large difference in linear expansion coefficient, a large thermal stress will be generated during the welding process, and this thermal stress cannot be eliminated basically; the thermal conductivity of the metal to be welded and When the difference in specific heat capacity is large, the temperature distribution during welding will be changed, thereby changing the crystallization conditions of the weld; when the electromagnetic properties of the metal to be welded differ greatly, the weld is poorly formed; The organization of the joint makes the performance of the joint unable to meet the requirements, etc.

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