Screw thread welding integral narrow slit type cold junction for coaxial pulse-tube refrigerator

Abstract

The invention discloses a thread weld integral slit type cold head of the coxial vessle refrigerator in the refrigeration technology field, including an upper cold head, a lower cold head, a cold end baffle and a copper wire, wherein the upper cold head and the lower cold head are welded again after the threaded connection, the cold baffle is arranged at the middle of the cold head integer, and the cold baffle is filled with the copper wire, wherein the lower cold head is divided into a base seat and a boss having the uniformly distributed slots in the axial symmetry. The depth of the slot is the same with the height of the boss, and the external thread is arranged at the cirumferential of the base seat; a cylinder is arranged on the upper cold head, a round hole at the center and radial slots in the distributed uniformly arranged at the cirumferential of the round hole. The width of the slot is consistent with the slot of the lower cold head; the internal thread structure of the upper cold head is matched with the external thread of the lower cold head, with the other end in the thread match with the cold accumulator, and is left with the margin for welding after being matched. The invention has large heat exchange area, and the welding structure ensures the leak detection safety of the pressure gas the welding reliability.

Description

Technical field [0001] The invention relates to a component of a refrigerator in the technical field of refrigeration, in particular to a screw-welded integral slit type cold head for a coaxial pulse tube refrigerator. Background technique [0002] The pulse tube refrigerator uses the high and low pressure gas to inflate and discharge the pulse tube cavity to obtain the cooling effect. According to the position of the cold accumulator and the pulse tube in the pulse tube refrigerator, it can be divided into coaxial type, U type and connecting shaft type. From a structural point of view, for optimized coaxially arranged pulse tube refrigerators, they are more compact and small in size and have received extensive attention. [0003] People have been improving the structure of the pulse tube refrigerator to further improve its performance. The gas in the coaxial pulse tube refrigerator produces a refrigeration effect at the cold end. The gas in the regenerator is bent 180° into the ...

AI Technical Summary

Problems solved by technology

Moreover, as the laminarization element at the cold end of the pulse tube, the central circular hole and radial slit structure have poor effect on the laminarization of the working gas.

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