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    AI Overview
    A Bellows Accumulator Helium Leak Detection System tests the integrity of a metal bellows in an accumulator by evacuating the bellows and applying helium to the outside, then using a mass spectrometer to detect any helium that passes through the bellows into the vacuum-sealed system, which indicates a leak . This non-destructive, highly sensitive method ensures the bellows are leak-tight, preventing the ingress of hydraulic fluid into the gas chamber and verifying the accumulator's functionality.
    How the System Works
    1. 1. Create a Vacuum:
      . Opens in new tab
      The metal bellows accumulator is connected to a helium leak detector's vacuum system, which evacuates air from the bellows.
    2. 2. Apply Helium Externally:
      . Opens in new tab
      While the system is under vacuum, helium gas is sprayed onto the external surface of the bellows.
    3. 3. Detection via Mass Spectrometry:
      . Opens in new tab
      A mass spectrometer in the leak detector identifies the tiny helium atoms that leak through the bellows' welds or material into the evacuated volume.
    4. 4. Leakage Indication:
      . Opens in new tab
      The detector signals the presence of helium, providing a precise leak rate and an audible or visual alarm to indicate an unqualified or leaky bellows.
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    Key Components
    • Bellows Accumulator: The device being tested, which separates hydraulic fluid from a gas precharge using metal bellows.
    • Helium Leak Detector: A specialized device using a mass spectrometer to detect helium.
    • Vacuum Pump : To create the high vacuum necessary for the sensitive detection of small leaks.
    • Spray Gun: To apply helium gas to the suspected leak areas of the bellows.
    • Test Object: The metal bellows accumulator itself.
    Why It's Used
    • High Sensitivity:
      It can detect extremely small leaks, ensuring a highly reliable and leak-tight product.
    • Non-Destructive:
      The test does not damage the bellows, allowing it to be put into service after testing.
    • Quality Assurance:
      It verifies the integrity of the bellows welds and overall construction, which is critical for accumulator performance and longevity.
    • Preventative Measure:
      By detecting leaks early, potential failures and fluid contamination can be avoided.
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