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US3821897A Expired / Lapsed US ⏱️ 0.0 years remaining

Pressure sensing probe

Assignee: SPX Technologies Inc
•
Filing: 1972-10-17
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Granted: 1974-07-02
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Expires: 1992-10-17
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Abstract

Abstract A pressure sensing probe having an elongated housing with an elastic diaphragm located at one end of the housing. The outer face of the diaphragm is substantially flush with the outer wall surface of the housing. An interior cavity is formed in the housing with at least a portion of the inner face of the diaphragm being in communication with the interior cavity. Also in communication with the interior cavity are a fluid supply port containing a flow-restricting supply orifice, a fluid output pressure port, and a fluid exhaust port containing a flowrestricting exhaust nozzle, each of which are formed in the walls of said housing. The diaphragm is normally biased inwardly by a biasing spring having its one end attached to an armature secured to the inner face of the diaphragm. The other end of the biasing spring is attached to an armature stem guide fixedly secured within the cavity of the housing which maintains the spring in constant tension. The armature also has a stem that passes downwardly within the biasing spring and through the armature stem guide. The lower end of the armature stem acts as a flapper which when the armature stem is raised and lowered varies the flow of fluid through the exhaust nozzle positioned beneath the flapper to control the amount of fluid passing outwardly through the fluid exhaust port. A fluid supply regulator is connected to the fluid supply port and a fluid exhaust regulator is connected to the fluid exhaust port in order to control the pressure of the fluid supplied through the orifice to the fluid cavity of the probe and to control the pressure of the fluid exhausted through the nozzle from the fluid cavity of the probe. The fluid output pressure port is also connected directly to each of the pressure regulators, thereby providing a pilot pressure for each of the regulators. The function of the probe is to reproduce exactly in fluid pressure the changes in the fluid pressure to which the sensing diaphragm is exposed. The probe output pressure reading will always be greater than the actual fluid pressure if the diaphragm is preset with an inward bias by the biasing spring. This probe biasing allows negative fluid pressures to be read out on the instrument as positive fluid pressures, thus enabling it to deal with negative heads of pressure.

Inventors

  • 👤 W Frazel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 16:20
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/38; G01F1/386; G01L; G01L11/00; G01L11/004; G01L11/006; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 234 words
A pressure sensing probe comprising a housing, an elastic diaphragm located in one wall of said housing, an interior cavity formed in said housing, at least a portion of the inner face of said diaphragm being in communication with said interior cavity, a fluid supply port formed in a wall of said housing with said fluid supply port being in communication with said interior cavity, a fluid output pressure port formed in a wall of said housing with said fluid output pressure port being in communication with said interior cavity, a fluid exhaust port formed in a wall of said housing with said fluid exhaust port being in communication with said interior cavity, means including a nozzle between the supply and exhaust ports and a flapper to vary the fluid flow through said cavity, said flapper coupled to said diaphragm, a fluid supply regulator connected to said fluid supply port and a fluid exhaust pressure regulator connected to said fluid exhaust port and means connecting said fluid output pressure port to each of said regulators, said fluid supply regulator maintaining fluid supply pressure to said fluid supply port a fixed increment above the pressure at said output pressure port and said fluid exhaust regulator maintaining pressure from said fluid exhaust port a fixed increment below pressure at said output pressure port, a flow restricting orifice between said fluid supply regulator and said interior cavity.
Claim 2
Dependent Claim 234 words
A pressure sensing probe comprising a housing, an elastic diaphragm located in one wall of said housing, an interior cavity formed in said housing, at least a portion of the inner face of said diaphragm being in communication with said interior cavity, a fluid supply port formed in a wall of said housing with said fluid supply port being in communication with said interior cavity, a fluid output pressure port formed in a wall of said housing with said fluid output pressure port being in communication with said interior cavity, a fluid exhaust port formed in a wall of said housing with said fluid exhaust port being in communication with said interior cavity, means including a nozzle between the supply and exhaust ports and a flapper to vary the fluid flow through said cavity, said flapper coupled to said diaphragm, a fluid supply regulator connected to said fluid supply port and a fluid exhaust pressure regulator connected to said fluid exhaust port and means connecting said fluid output pressure port to each of said regulators, said fluid supply regulator maintaining fluid supply pressure to said fluid supply port a fixed increment above the pressure at said output pressure port and said fluid exhaust regulator maintaining pressure from said fluid exhaust port a fixed increment below pressure at said output pressure port, a flow restricting orifice between said fluid supply regulator and said interior cavity.
Claim 3
Dependent Claim 27 words
A pressure sensing probe as recited in claim 1 wherein the outer face of said diaphragm is substantially flush with the outer wall surface of said housing.
Claim 4
Dependent Claim 51 words
A pressure sensing probe as recited in claim 1 further comprising means for biasing said diaphragm comprising an armature attached to the inner face of said diaphragm and a biasing spring having its one end attached to said armature and its other end attached to spring anchoring means on said housing.
Claim 5
Dependent Claim 33 words
A pressure sensing probe as recited in claim 3 wherein said armature has a stem that passes downwardly within said biasing spring and through a guide aperture formed in said spring anchoring means.
Claim 6
Dependent Claim 34 words
A pressure sensing probe as recited in claim 3 wherein the lower end of said armature stem forms a flapper which when it rises and falls varies the flow of fluid through said nozzle.
Claim 7
Dependent Claim 33 words
A pressure sensing probe as recited in claim 3 including a centering diaphragm in said cavity wherein the lower end of the armature passes through said centering diaphragm to which it is secured.
Claim 8
Dependent Claim 36 words
A pressure sensing probe as recited in claim 9 wherein a biasing spring is attached to the lower end of the armature and to the housing together with means for adjusting the bias of said spring.
Claim 9
Dependent Claim 93 words
A pair of the pressure sensing probes such as the probe recited in claim 1 in combination with a Venturi tube, said first pressure sensing probe having the outer face of its flexible diaphragm inserted in a tap in the inlet area of the Venturi tube and said second pressure sensing probe having the outer face of its flexible diaphragm inserted in a tap in the throat area of the Venturi tube, both of the outer faces of said flexible diaphragms, being substantially flush with the inner wall surface of said Venturi tube.

References Cited (Backward Citations)

US1992343A Cited
US2265114A Cited
US2308923A Cited
US2405979A Cited
US3171330A Cited
US3277721A Cited
US3598138A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-07-01 1977-12-31 1978-07-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-07-01 1981-12-31 1982-07-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-07-01 1985-12-31 1986-07-02 $7700.00 Window Closed / Lapsed

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