Device and method for detecting leak rate of O type rubber sealing ring used for spaceflight

Abstract

The invention discloses a device and a method for detecting the leak rate of an O type rubber sealing ring used for spaceflight, which belong to the technical field of the detection of spaceflight components. The device comprises gas storage equipment, an inflation valve, a first pre-pumping valve, a second pre-pumping valve, a leak detection tooling, a leak marking valve, a standard leak, a vacuum gauge, a deflation valve, a leak detection valve, a leak detector, a forestage angle valve, a prepump, a molecular pump, an ultrahigh vacuum gate valve and a vacuum booster pump. The method comprises the following steps of: firstly, pumping the pressure of a detection chamber and a dummy module below the air pressure of 10Pa, then pumping the detection chamber to a lower pressure by the molecular pump, forming a pressure difference between the detection chamber of the leak detection tooling and the dummy module and afterwards introducing high-purity gas with a standard atmosphere pressure into the dummy module. If a leak exists in a rubber sealing ring to be detected, the high-purity gas can enter the detection chamber by the sealing ring under the action of the pressure difference, and the leak rate of the sealing ring can be accurately calculated by the magnitude of the change of the output indication of the leak detector. The invention has the advantages of high detection sensitivity, high detection efficiency, reliable result and the like.

Description

technical field [0001] The invention relates to a leakage rate detection device and method of a rubber sealing ring, belonging to the technical field of aerospace device detection. Background technique [0002] O-ring rubber seals are widely used in aviation, aerospace, shipbuilding, electrical and electronics, chemical instruments, automobile manufacturing, mechanical assembly and other industries, as well as various fields of medical care and daily life. Especially in space vehicles, O-ring rubber seals play an extremely important role. [0003] When a space vehicle (such as the "Shenzhou" manned spacecraft) is in orbit, because it flies in a vacuum environment, a certain pressure must be maintained in the cabin of the vehicle to ensure the safety of the astronauts and the normal operation of the instruments and equipment. Since the O-ring rubber sealing ring in the long-term orbiting vehicle is subject to various cosmic ray radiation, temperature effects, and long-term p...

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Problems solved by technology

[0004] At present, the leak rate evaluation method of domestic units for rubber seal rings used in space vehicles is mainly to study the influence of various design parameters on the leak rate. The leak rate detection device uses large-scale ring mold equipment to simulate the airtight cabin of space vehicles, and its volume is huge. , complex operation, long detection cycle, high detection cost

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