Method for lowering internal stress of corrugated pipe

Abstract

The invention discloses a method for lowering internal stress of a corrugated pipe. The method comprises the following steps of 1, fixing the corrugated pipe into a vibrating clamp assembly, and fixing a vibrating clamp to a vibrating device; and making the vibrating device vibrate for a preset period of time at the preset frequency, so that the corrugated pipe with the internal stress lowered is obtained. By means of the method, the internal stress of the corrugated pipe can be remarkably lowered; meanwhile, other properties, such as rigidity and hardness, of a material are not affected; the defect that internal stress of a refrigerator corrugated pipe used in the infrared detection field is released only through natural aging, namely long-time storage, can be effectively overcome; the problem that corrugated-pipe type self-adjustment refrigerators are generally poor in stability can be well solved; and the method is low in process difficulty and easy to operate.

Description

technical field [0001] The invention relates to the refrigeration field, in particular to a method for reducing the internal stress of a corrugated pipe. Background technique [0002] Miniature throttling refrigerators have the advantages of compact structure, small size, light weight, and fast start-up. They are widely used in military infrared thermal imaging systems. According to different applications, they are usually divided into two categories: self-adjusting and quick-starting. The type refrigerator is the most commonly used type of self-regulating refrigerator. As the key adjustment mechanism of the refrigerator, the bellows is a precision thin-walled part formed by precision micro-electroforming nickel-cobalt alloy, and the thickness of the casting layer is only 0.1mm. In the micro-electroforming process, it is inevitable that the casting layer will produce a certain macroscopic internal stress, especially for thin-walled parts. It has a great impact on the mechan...

AI Technical Summary

Problems solved by technology

[0003] At present, the self-regulating refrigerator bellows still has the problem of poor stability, which is difficult to overcome

The main reason for the stable flow fluctuation of the refrigerator is that the refrigerator requires high precision for the mechanical properties of the regulating mechanism, and the internal stress of the bellows itself has not been completely released. The residual internal stress of the bellows continues to release, resulting in a slight change in its own length, and the relative position of the valve needle and the orifice moves, causing the stable flow rate of the product to change again, affecting the stability of the refrigerator

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