Pressure generator for gas pressure fatigue tester

Abstract

The invention relates to a pressure generator with alternately changed high and low pressure for a gas pressure fatigue tester, belonging to a testing technology. The pressure generator comprises an electric motor, a coupler, a turntable, a pressure chamber, a gas source and a flow valve, wherein the electric motor is connected with the coupler, the coupler is connected with the turntable, and a series of striped grooves are uniformly distributed on the outer circumferential surface of the turntable; the pressure chamber is arranged on a connecting piece, the matched surface of the connecting piece and the turntable is uniformly provided with three exhaust ports, wherein the middle exhaust port is communicated with the pressure chamber, one of the two side exhaust ports is communicated with the atmosphere through the flow valve, and the other side exhaust port is connected with the stable gas source; the grooves on the turntable is long enough to cover two adjacent exhaust ports in the three exhaust ports on the connecting piece, and the distance between the two grooves is larger than the diameter of the exhaust ports; and a gap which is between 0.1m and 0.5 mm is reserved between the turntable and the connecting piece so as to avoid direct contact friction. The high and low pressure values and the frequency of alternately changed pressure fluctuation of the pressure generator can be regulated within a large range, and particularly, the pressure generator has very high durability and reliability.

Description

technical field [0001] The invention belongs to the test technique and relates to a pressure generator for a gas pressure fatigue testing machine with alternating high and low pressures. Background technique [0002] With the improvement of social requirements for the reliability of various pressure equipment, there are more and more demands for pressure aging tests and fatigue life tests using alternating high and low pressures. The existing pressure fatigue testing machine is basically a medium-high pressure hydraulic device. For fatigue tests requiring one million or even ten million pressure cycles, the continuous test time can reach hundreds of hours, and the technical capabilities of existing equipment cannot reach The technical requirements of pressure fatigue test, especially the reliability and durability of the testing machine itself cannot meet the needs of long-term fatigue test. In addition, there is no special gas pressure fatigue testing machine. People often...

AI Technical Summary

Problems solved by technology

The existing pressure fatigue testing machine is basically a medium-high pressure hydraulic device. For fatigue tests requiring one million or even ten million pressure cycles, the continuous test time can reach hundreds of hours, and the technical capabilities of existing equipment cannot reach The technical requirements of pressure fatigue test, especially the reliability and durability of the testing machine itself cannot meet the needs of long-term fatigue test

In addition, there is no special gas pressure fatigue testing machine. People often use simple electromagnetic valves to control the alternating change of gas pressure between high and low pressure, but the life of the electromagnetic valve itself is basically hundreds of thousands of times of switching. Life expectancy will be further shortened

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