Split type Stirling refrigerating machine

Abstract

The present invention discloses a split type Stirling refrigerating machine, for principally resolving the existing deficiency of service lifetime and reliability of the machine in the existent technology. In a compressor of the invention, two compression pistons with a same shaft line is driven by two linear motors, wherein the two linear motor are arranged symmetrically, and the two pistons move oppositely; the linear motors are moving magnetic type linear motors and have double voice coils structure; the compression piston is supported by two sets of diaphragm springs with a small quality and a long lifetime, and a non-contact clearance seal structure is employed between the piston and an air cylinder; an decompressor employs a ejector structure with a small quality, and is supported by a cylinder spring and is driven pneumatically; an air cylinder of the decompressor is formed by laser welding a rustless steel thin wall cylinder block of a through hole and a rustless steel air cylinder bulkhead. The refrigerating machine of the invention is principally used for infrared systems to provide a low-temperature cold source for infrared devices, wherein the longevity and the reliability of the refrigerating machine are improved greatly by more than 20, 000 hours; at the same time the refrigerating machine keeps the advantage of small volume and weight, and simple structure, and the weight is no more than 2kg.

Description

technical field [0001] The invention relates to a split-type Stirling refrigerator, which belongs to the technical field of refrigeration and low temperature, and specifically refers to a small-volume, light-weight, long-life and reliable refrigerator that is used in an infrared system to provide a low-temperature cold source for an infrared device. High split Stirling refrigerator. Background technique [0002] The Stirling refrigerator is a gas regenerative closed-cycle refrigerator that works according to the reverse Stirling cycle. Since the Philips Laboratory in the Netherlands developed a practical Stirling refrigerator in 1954, the Stirling refrigerator has experienced half a cycle. With the development of the century, the structural form has developed from the integral type to the split type; the driving mode has evolved from the rotary motor drive to the linear motor drive. The research on split Stirling refrigerators really started after the 1970s. [0003] The s...

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that the piston has no radial support, there is friction between the piston and the cylinder, and there is inevitably wear on the surface of the piston. After thousands of hours of operation of the refrigerator, when the amount of wear accumulates to the point where the dynamic sealing effect cannot be guaranteed, the gap seal will fail. The refrigeration capacity of the refrigerator is reduced or even fails; the coil of the moving coil linear motor is difficult to dissipate heat, and the non-metallic material of the coil winding is heated and volatilized and released, which will pollute the working medium of the refrigerator, reduce the performance of the refrigerator or even make the refrigerator invalid; the motor has high-frequency vibration The lead wire, and the fatigue fracture of the high-frequency vibration lead wire will cause the failure of the refrigerator; the compressor end cover has glass sintered lead wire insulation terminals, and the glass sintered lead wire insulation terminals are the weak links that cause the leakage of the working fluid of the refrigerator, and the leakage of the working fluid will cause refrigeration. machine failure

These deficiencies in the reliability design of the lightweight split Stirling refrigerator determine that its reliability is usually 3000-5000 hours, and the maximum is no more than 10000 hours, which greatly limits its application field

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