Pressure transducer
First Claim
1. A pressure transducer including, in combination:
- (a) a housing portion provided with an opening at an outer end thereof;
(b) a circular, disc-shaped first diaphragm having a central, first flexing portion and mounted in said housing such that an outer face of the flexing portion is exposed through said opening;
(c) the first flexing portion of said first diaphragm having an inner face provided with a first strain gauge;
(d) a support plate member secured to said housing portion and adapted to support the first diaphragm to prevent overstressing thereof on extreme pressures;
(e) first transducing means for transmitting a signal produced by the first strain gauge; and
(f) a layer of resilient, rubber-like material sandwiched between the flexing portion of the first diaphragm and the support plate member for transmitting the flexure of the flexing portion of the first diaphragm, due to pressures at said opening, from said first diaphragm to said support plate member.
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Accused Products
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.
19 Citations
24 Claims
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1. A pressure transducer including, in combination:
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(a) a housing portion provided with an opening at an outer end thereof; (b) a circular, disc-shaped first diaphragm having a central, first flexing portion and mounted in said housing such that an outer face of the flexing portion is exposed through said opening; (c) the first flexing portion of said first diaphragm having an inner face provided with a first strain gauge; (d) a support plate member secured to said housing portion and adapted to support the first diaphragm to prevent overstressing thereof on extreme pressures; (e) first transducing means for transmitting a signal produced by the first strain gauge; and (f) a layer of resilient, rubber-like material sandwiched between the flexing portion of the first diaphragm and the support plate member for transmitting the flexure of the flexing portion of the first diaphragm, due to pressures at said opening, from said first diaphragm to said support plate member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. For use in a pressure transducer, a diaphragm set comprising, in configuration:
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(a) a disc-shaped first diaphragm member having a normally outer surface adapted to be exposed to a pressurized medium; (b) a strain gauge fixedly secured to a second surface of said first diaphragm member; (c) a disc-shaped second diaphragm member having a first surface turned to said second surface of the first diaphragm member; (d) a transition layer of a resilient rubber-like material sandwiched between the first and the second diaphragms; (e) a second strain gauge fixedly secured to said second diaphragm at a second surface thereof; and (f) transducer means for transmission of signals generated by said gauge strips. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification