Helium leakage detection device and method for double-layer pipe with interlayer

[0027] A double-layer tube helium leak detection device with an interlayer, comprising an inner tube, an outer tube and a helium leak detection tool, the helium leak detection tool includes a first seal, a second seal, a first blocking plate 4, a second Blocking plate 9, inflatable cover 8 and sealed flange box 2.

[0028] The inner tube is sleeved in the outer tube, the inner tube is sealed and connected to the first end of the sealing flange box 2 through a first sealing member, and the outer tube is connected to the sealing flange through a second sealing member The tank 2 is connected at a second end, said first end having a smaller diameter than said second end. One end of the inner tube is blocked with a first blocking plate 4, and the other end of the inner tube is blocked with a second blocking plate 9. The first blocking plate 4 is provided with a helium inlet hole. An inflatable cover 8 is arranged outside the outer tube, and a helium inlet hole is arranged on the inf

[0041] The difference between this embodiment and Embodiment 1 is that a helium leak detection method based on the above-mentioned double-layer tube helium leak detection device with interlayer is provided, including:

[0042] Helium is introduced into the inner tube through the helium inlet hole provided on the first blocking plate 4 , and the airtightness of the inner tube is detected by a helium mass spectrometer connected to the sealed flange box 2 .

[0043] Helium is passed into the outer tube through the helium inlet hole provided on the gas-filled cover 8 . And the airtightness of the outer tube is detected by a helium mass spectrometer connected to the sealed flange box 2 .