Metal bellows welding structure with long fatigue life

Abstract

The invention discloses a metal bellows welding structure with long fatigue life. The metal bellows welding structure comprises metal bellows, a transition ring for fixing the metal bellows, compression rings for eliminating the contact gaps between the metal bellows and the transition ring and a screw for connecting the metal bellows, the transition ring and the compression rings, wherein one end of the metal bellows is provided with a stress release ring of a semicircular flanging structure, the transition ring is in assembling connection with the stress release ring and used for providing a support structure for the metal bellows and serves as the flanging female die of the stress release ring, and the two compression rings are matched during use and respectively connected with the stress release ring and the transition ring. The metal bellows welding structure has the advantages that the repeated discharge times of the metal bellows are increased, the work reliability of the metal bellows is increased, the application range of the metal bellows in aerospace systems is expanded, and the metal bellows welding structure is high in reliability, high in safety, long in fatigue life, widely applicable to military and civil fields with high repeated discharge times requirements, and the like.

Description

technical field [0001] The invention relates to a welding structure, in particular to a metal membrane box welding structure with high fatigue life. Background technique [0002] The metal bellows is a device used by the space power system to store and manage liquid propellants. Its one end is fixed, and the other end can be stretched and compressed freely. The requirements for refueling use are especially suitable for the repeated replenishment needs of the space station for more than dozens of times. In addition, the metal bellows can also be used as a compensation device to assist other propellant management devices to adapt to the volume expansion caused by temperature changes. At the same time, the metal diaphragm box can also be used in the emergency system of the aircraft to meet the additional needs on the ground. [0003] At present, the common fixing methods of metal bellows in China all adopt the form of end welding, and there is a large stress concentration at ...

AI Technical Summary

Problems solved by technology

[0003] At present, the common fixing methods of metal bellows in China are end-face welding. There is a large stress concentration at the weld between the metal bellows and the fixed structure, which greatly affects the fatigue life of the metal bellows.

As some models have increased requirements for the number of additional rows of metal diaphragm boxes, the traditional welded structure of metal diaphragm boxes can no longer meet the requirements

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