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Pressure sensor with a substantially flat overpressure stop for the measuring diaphragm

  • US 4,572,000 A
  • Filed: 12/09/1983
  • Issued: 02/25/1986
  • Est. Priority Date: 12/09/1983
  • Status: Expired due to Term
First Claim
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1. A transducer for sensing a magnitude of a first pressure and having a first pressure chamber and a second pressure chamber for sensing at least the magnitude of the first pressure comprising:

  • a housing;

    center stop means on the housing and having a substantially flat first face for providing a portion of the first pressure chamber and a substantially flat second face for providing a portion of the second pressure chamber, respectively.first sensor diaphragm means open and responsive to said first pressure supported on the center stop means for enclosing, with the first face, the first pressure chamber, said first diaphragm means having a substantially flat surface contacting the flat first face at a substantially unstressed condition;

    second sensor diaphragm means supported on the center stop means for enclosing, with the second face, the second pressure chamber;

    passageway means provided in the center stop means for fluidically coupling the first pressure chamber to the second pressure chamber such that when the magnitude of a first pressure exceeds a predetermined magnitude the first sensor diaphragm is supported by the first face of the center stop means;

    a filling of substantially noncompressible fluid in the passageway means and in both the first and second chambers to bow both the first and second sensing diaphragm means away from the respective first and second faces with substantially equal external pressures on the first and second diaphragm means; and

    sensing means for sensing the deflection of at least one of the diaphragm means.

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