Measuring and testing – With fluid pressure – Leakage
Patent
1989-08-22
1991-02-12
Noland, Tom
Measuring and testing
With fluid pressure
Leakage
73592, 73 1R, 73 40, G01M 302, G01M 324
Patent
active
049914260
ABSTRACT:
Method and apparatus for testing leak integrity of a workpiece such as a wheel rim in which the rim is positioned within an air-tight housing with the axial rim edges is sealing engagement with opposed wall portions of the housing so as to form first and second chambers within the housing internally and externally of the rim. One of such chambers is supplied with air under pressure. Microphones are positioned in the other chamber for detecting leakage of air through the rim as a function of intensity of ultrasonic radiation emitted thereby. The test apparatus is calibrated to detect air leakage that exceeds a pre-specified maximum allowable air flow rate by removably mounting a calibration orifice on a test workpiece, with the orifice being sized to provide the pre-specified maximum allowable leakage flow rate for a satisfactory workpiece at the operating pressure of the apparatus. With the test workpiece in place, the detection electronics is adjusted to indicate an unsatisfactory workpiece when the microphone output exceeds the level associated with air flow through the test orifice.
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"Extending the Range of Leak Detectors", NASA Tech. Briefs, Spring 1979, vol. 4, No. 1, p. 105, by M. E. Bull, in 73/40.7.
Noland Tom
Oakland Engineering Inc.
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