A Method for Reducing Internal Stress of Bellows

A technology of bellows and internal stress, applied in the field of refrigeration, can solve the problems of poor stability of bellows, stable flow changes, and incomplete release of internal stress of bellows, etc., and achieve the effect of improving poor stability, reducing internal stress, and low process difficulty

Active Publication Date: 2019-03-22
11TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Method for Reducing Internal Stress of Bellows
  • A Method for Reducing Internal Stress of Bellows
  • A Method for Reducing Internal Stress of Bellows

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] A method for vibration aging treatment to reduce the internal stress of the bellows of a self-regulating refrigerator includes the following steps:

[0039] (1) Put the polytetrafluoroethylene sleeve in any straight hole of the stainless steel vibrating fixture, put the experimental bellows into the straight hole, and fix it with screws through the flange.

[0040] (2) Put the vibrating jig with bellows on the vibrating table of the vibrating device and fix it stably. The vibration frequency is set to 500Hz, vibrate for 1 hour, and the corrugated pipe taken out after the vibration is finished is the corrugated pipe whose internal stress has been reduced after aging through vibration treatment.

[0041] According to the material analysis method, the stress calculation formula σ=K·M, where K is the stress constant, M is the diffraction angle θ to the diffraction crystal plane azimuth angle sin 2 The change slope of ψ was measured by X-ray diffractometer to measure the an...

example 2

[0043] A method for vibration aging treatment to reduce the internal stress of the bellows of a self-regulating refrigerator includes the following steps:

[0044] (1) Put the polytetrafluoroethylene sleeve in any straight hole of the stainless steel vibrating fixture, put the experimental bellows into the hole, and fix it with screws through the flange.

[0045](2) Put the vibrating jig with bellows on the vibrating table of the vibrating device and fix it stably. The vibration frequency is set to 2.5KHz, vibrate for 1 hour, and the corrugated pipe taken out after the vibration is completed is the corrugated pipe whose internal stress has been reduced after aging through vibration treatment.

[0046] According to the material analysis method, the stress calculation formula σ=K M, where K is the stress constant, M is the diffraction angle θ to the diffraction crystal plane azimuth angle sin 2 The change slope of ψ is measured by X-ray diffractometer to measure the angle relat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00
CPCC21D10/00
Inventor 张燕韩蓬磊李勉
Owner 11TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap