Conical slit-type hot end heat exchanger of coaxial pulse tube refrigerator and manufacturing method

Abstract

The invention discloses a conical slit-type hot end heat exchanger of a coaxial pulse tube refrigerator and a manufacturing method. The heat exchanger structurally consists of a hot end flange, a conical slit and a hot end plug, wherein the conical slit is inserted into the hot end flange in a tight fit way, the radius of a circle of contact on the top of a cone frustum is equal to the radius of a cold accumulator and the radius of the bottom of the cone frustum is equal to the radius of the hot end plug. The hot end plug and the hot end flange not only can be connected through bolts to form a detachable split-type hot end heat exchanger, but also can be hermetically welded to form an integrated hot end radiator. The conical slit-type hot end heat exchanger has the advantages that the structure is simple, compact and high-efficiency, the hot end radiating capacity of the refrigerator can be exerted to the utmost extent and the hot end pressure ratio of the pulse tube refrigerator is increased at the same time. The structure can intensively realize the major functions of a high-efficiency hot end heat exchanger, a hot end gas flow guide device of the pulse tube refrigerator and a hot end gas even distributor of the cold accumulator, and can improve the performance of the entire pulse tube refrigerator to a great extent.

Description

technical field [0001] The patent relates to a coaxial pulse tube refrigerator, in particular to a conical slit hot end heat exchanger and a manufacturing method of the coaxial pulse tube refrigerator. Background technique [0002] The pulse tube refrigerator was proposed by Gifford and Longsworth in the 1960s. In the mid-1980s, the efficiency and stability of the pulse refrigerator were greatly improved through the improvement of the phase adjustment mechanism at the hot end of the pulse refrigerator. It cancels the cold-end ejector widely used in Stirling or G-M machines, and replaces it with a pulse tube; instead of the cold-end ejector, it realizes the pressure wave required for refrigeration through the operation of the hot-end phasing mechanism Phase difference with mass flow. The pulse tube refrigerator can achieve low vibration, low interference and no wear at the cold end; the pulse tube refrigerator has been greatly developed in theory and experiment in the middle...

AI Technical Summary

Problems solved by technology

The three layout methods have their own advantages and disadvantages in practical application

[0011] 1) The pressure drop is larger than that of the slit heat exchanger, and the loss through the hot end heat exchanger becomes larger;

[0012] 2) The wire mesh and the flange wall must be closely matched, which is difficult to achieve now;

[0013] image 3 Although the conventional cylindrical slit-type hot-end heat exchanger shown can also exchange heat efficiently, due to the limitation of the hot-end flange structure, the heat exchange area of ​​the slit is limited, and often cannot meet the best heat dissipation requirements;

[0014] The above-mentioned many factors lead to the decline of the overall performance of the refrigerator, which is one of the key factors affecting the actual cooling efficiency of the coaxial pulse tube refrigerator and one of the important reasons hindering its practical application.

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