Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1987-04-06
1988-10-11
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
338 4, G01L 708, G01L 904
Patent
active
047762195
ABSTRACT:
A pressure transducer is provided, in a preferred embodiment, with a pair of diaphragms (29, 28), each with a strain gauge, and with a rubber-like intermediate layer (33) therebetween. The layer (33) supports the first diaphragm (29) without interfering with its flexing up to a point where the layer (33) becomes non-resilient and transmits further flexing of the first diaphragm to the second diaphragm (28). The diameter of each diaphragm has to be about 2.75-3.75 times greater than that of its central flexing portion forming the bottom of a cavity (30) which, in the shown embodiment, is conical. The overall thickness of the diaphragm is preferably about 5 times greater than the thickness of the flexing portion to eliminate or at least substantially reduce the influence of parasitic stresses introduced by clamping forces holding the diaphragm in place. This, in turn, will improve the accuracy of the transduced values which will stay generally linear as long as the deflection of the flexing portion is within about 25% of the thickness thereof. The invention presents the advance of simple structure affording a wide measuring range and an improved accuracy of measurement.
REFERENCES:
patent: 3240065 (1966-03-01), Taber
patent: 3343420 (1967-09-01), Kondo et al.
patent: 3484732 (1969-12-01), Postma
patent: 3559488 (1971-02-01), Weaver
patent: 3950996 (1976-04-01), Lewis
patent: 4058788 (1977-11-01), Andrews et al.
patent: 4135408 (1979-01-01), DiGiovanni
patent: 4686764 (1987-08-01), Adams
Nawrocki Lawrence M.
Woodiel Donald O.
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