Sampling device used in satellite total leak rate testing leak detector

Abstract

The invention provides a sampling device used in a satellite total leak rate testing leak detector. The sampling device comprises a valve body, fixed size pores, a standard gas solenoid valve and a sample gas solenoid valve, wherein a leak detecting port connecting part is arranged between the valves; the upper part of a main channel of the leak detecting port connecting part is connected with a leak detecting port and pores are arranged at the connecting part; a sampling port of the leak detecting port connecting part is correspondingly connected with the standard gas solenoid valve and the sample gas solenoid valve; a standard gas inlet, a standard gas outlet and two sample gas ports are arranged at two sides of the valves respectively; and the standard gas inlet, the standard gas outlet and the two sample gas ports are gathered to one channel and communicated with the corresponding standard gas solenoid valve and the sample gas solenoid valve respectively. Compared with the prior art, the switchover between the standard gas and the sample gas during a total leak rate testing process is realized through the solenoid valve, the flow limiting during the total leak rate testing process is realized through the fixed sized pores, and the randomness that the flow limiting is realized depending on the compression of scratch is avoided.

Description

technical field [0001] The invention relates to a sampling device for a satellite total leak rate test leak detector, in particular to an electric sampling process capable of completing the leak detector, and jointly completing the sampling of the total leak rate test with a standard helium mass spectrometer leak detector device, and finally realize the automation of the total leak rate testing process. Background technique [0002] With the continuous development of aerospace technology, the demand for automation is getting higher and higher. The previous manual testing work needs to be improved, and the satellite total leak rate test also needs to be automated. The sampling system, the key device of the total leak rate test, restricts the automation of the test. There is an urgent need to develop a sampling device that is easy to automate. [0003] The schematic diagram of the sampling device structure of the existing leak detector is as follows: figure 1 shown. [0004...

AI Technical Summary

Problems solved by technology

[0005] This kind of device can realize the sampling work in the process of satellite total leak rate test, but it needs to rely on manual operation, which is very cumbersome and difficult to realize automation. Bottleneck, it is urgent to develop a new sampling device to realize the full automation of the total leak rate test process

In addition, the flow rate of gas entering the leak detector is determined by figure 1 It is realized by extruding artificial scratches on the tapered part behind the thimble 2. The flow rate of this flow limiting device is unstable, and it is not easy to make a series of standard products.

Images