Helium mass spectrometry back pressure leak detection method for stainless steel weld seam of multilayer composite structure conductor
A helium mass spectrometer leak detector and multi-layer composite technology, which is applied in the field of superconducting tokamak device internal coil detection, can solve the problems of stainless steel armor layer 3 leak detection, etc., and achieve the effects of convenient operation, guaranteed sealing, and simple processing
Active Publication Date: 2021-06-29
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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Problems solved by technology
The existing ITER conductor leak detection method is only suitable for conductors that can apply helium pressure inside. For the inner coil conductor, since the stainless steel armor layer 3 has an insulating layer 2 and a copper conductor 1 inside, it is impossible to apply helium pressure inside. Stainless steel armor layer 3 for leak detection
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[0023] Such as image 3 As shown, a multilayer composite structure conductor outer layer stainless steel weld helium mass spectrometry back pressure leak detection method, the specific steps are as follows:
[0024] (1) Leak detection system assembly: the leak detection system includes a helium mass spectrometer leak detector, a leak detection tool and a rough pump, and the helium mass spectrometer leak detector and the rough pump all pass through the pipeline and the first vacuum valve It is connected with the leak detection tool, and the leak detection tool is connected with the standard leak hole through the pipeline and the second vacuum valve;
[0025] (2) Calibration: First, connect the helium mass spectrometer leak detector directly to the standard leak, and perform the calibration operation on the helium mass spectrometer leak detector. The output signal value of the standard leak on the helium mass spectrometer leak detector is the calibrated leak rate Q of the system...
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The invention discloses a helium mass spectrometer back pressure leak detection method for stainless steel weld seams in the outer layer of a multilayer composite structure conductor. First pressurize the weld area, keep the pressure for a period of time, and then use the leak detection tool for detection. The method of the invention realizes the back pressure leak detection of the conductor weld seam of the multilayer composite structure, and designs the sealing head of the pressurized tooling, which not only ensures the sealing performance under high pressure, but also ensures that the tooling can be installed in the multilayer composite structure. Repeated disassembly and installation on the conductor. The sealing design of the sealing head of the pressurized tooling in the present invention has the advantages of simple processing, convenient operation and easy realization.
Description
technical field [0001] The invention relates to the technical field of a detection method for an internal coil of a superconducting tokamak device, in particular to a helium mass spectrometer back pressure leak detection method for a stainless steel weld seam on the outer layer of a multilayer composite structure conductor. Background technique [0002] ITER is currently the first self-sustaining combustion superconducting tokamak fusion reaction experimental device designed and built in the world. It integrates the main scientific and technological achievements of today's international controlled magnetic confinement nuclear fusion research, and is the first human controlled thermonuclear fusion It is an indispensable step in the process of research towards practicality, so it is highly valued by governments and scientific research circles of various countries. In order to improve the vertical stability of the plasma in the vacuum chamber and the safety of the device, ITER ...
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IPC IPC(8): G01M3/26
CPCG01M3/26
Inventor 刘小川朱超金京高娟武玉秦经刚邹红飞
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI