Testing system for testing fatigue life of diaphragm capsule bearing alternating pressure

Abstract

A testing system for testing the fatigue life of a diaphragm capsule bearing alternating pressure comprises a diaphragm capsule assembly installation seat (2), a high-pressure pipeline (10), a low-pressure pipeline (11) and the like, wherein a pressure bearing cavity (14) is commonly formed among an outer barrel and an inner barrel of the diaphragm capsule installation seat (2) and a diaphragm capsule assembly (1); connecting openings which are communicated with the pressure bearing cavity (14) are formed in the side wall of the outer barrel of the diaphragm capsule installation seat (2); each connecting opening is respectively connected with the high-pressure pipeline (10), the low-pressure pipeline (11) and a first pressure sensor (8); the high-pressure pipeline (10) is provided with a first electromagnetic valve (4) and is connected with a high-pressure air source through a high-pressure air inlet (12); the low-pressure pipeline (11) is provided with a second electromagnetic valve (5) and a pressure stabilizing tank (6) and is connected with a low-pressure air source through a low-pressure air inlet (13). According to the testing system disclosed by the invention, lowest pressure borne by a diaphragm capsule can be freely adjusted, and the testing accuracy is increased.

Description

technical field [0001] The invention belongs to the technical field of fatigue mechanics test, and relates to a test system for testing the fatigue life of a bellows. Background technique [0002] The bellows is a metal element composed of several sets of welded thin films, which can withstand high temperature, high pressure, and large axial deformation. Capsules are widely used in rotary face seal structures in the aerospace industry. The processing technology of the bellows is complicated, and the quality of different batches of products often varies greatly. For the bellows used under the condition of alternating pressure, the fatigue life sampling test is an important testing method before leaving the factory. [0003] At present, the fatigue life test process carried out by the manufacturer is usually: first inflate, raise the pressure of the bellows to the highest value, then exhaust, reduce the pressure of the bellows to zero; then inflate, then exhaust..., repeat ...

AI Technical Summary

Problems solved by technology

This will lead to a very large space occupied by the test system, and the construction cost of the test system is very high

In addition, if the test time is too long, the pressure in the pressure stabilizing vessel will still rise slowly, which is not conducive to the precise control of the minimum pressure of the test

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