US3882443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure transducer
Assignee: Yokogawa Electric Corp
•
Filing: 1973-06-06
•
Granted: 1975-05-06
•
Expires: 1993-06-06
Abstract
Abstract A differential-pressure transducer whose main body is formed with opposing end faces and a passage extending between these end faces, the passage being filled with a non-compressible liquid. Mounted adjacent each end face is a pressure-sensing diaphragm, the two diaphragms being interconnected by a rod extending through the passage and terminating at each end in a disc. The diaphrams are secured to the peripheries of the discs, the rod being axially displaced in accordance with a differential pressure applied to the diaphragms. Disposed adjacent the end faces of the discs or the end faces of the main body is at least one temperature-compensating diaphragm which serves to absorb the expansion and contraction of the liquid in the passage caused by changes in ambient temperature.
Inventors
- 👤 Saichiro Mortia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:04
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/04; G01L13/00; G01L13/02; G01L13/025; G01L9/00; G01L9/0041; G01L9/007
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
A differential pressure transducer comprising: A. a main body formed with opposing end faces and a passage extending therebetween, the passage being filled with a noncompressible liquid; B. a pressure-sensing diaphragm mounted closely adjacent each end face of the main body to define a narrow space therebetween, said liquid also filling said space; C. a rod extending through the passage and terminating at either end in discs having end faces, the diaphragms being secured to the peripheries of the discs whereby the rod is axially displaced in accordance with differential-pressure applied to the diaphragms; D. at least one temperature-compensating diaphragm disposed closely adjacent one of said end faces to define a narrow space therebetween, liquid from the passage being led to said space whereby this diaphragm serves to absorb the expansion or contraction of the liquid in the passage as a result of ambient temperature changes; and E. means coupled to said rod to translate the axial displacement thereof into an electrical output signal.
Claim 2
Dependent Claim
164 words
A differential pressure transducer comprising: A. a main body formed with opposing end faces and a passage extending therebetween, the passage being filled with a noncompressible liquid; B. a pressure-sensing diaphragm mounted closely adjacent each end face of the main body to define a narrow space therebetween, said liquid also filling said space; C. a rod extending through the passage and terminating at either end in discs having end faces, the diaphragms being secured to the peripheries of the discs whereby the rod is axially displaced in accordance with differential-pressure applied to the diaphragms; D. at least one temperature-compensating diaphragm disposed closely adjacent one of said end faces to define a narrow space therebetween, liquid from the passage being led to said space whereby this diaphragm serves to absorb the expansion or contraction of the liquid in the passage as a result of ambient temperature changes; and E. means coupled to said rod to translate the axial displacement thereof into an electrical output signal.
Claim 3
Dependent Claim
29 words
A transducer as set forth in claim 1 wherein said translation means is constituted by a core secured to said displaceable rod and movable with respect to fixed coils.
Claim 4
Dependent Claim
22 words
A transducer as set forth in claim 1, wherein two temperature-compensating diaphragms are provided each in association with a respective pressure-sensing diaphragm.
Claim 5
Dependent Claim
39 words
A transducer as set forth in claim 1, wherein the end face associated with said temperature-compensating diaphragm is contoured to conform to the contour of the diaphragm whereby the end face accommodates the diaphragm when it is pressed thereagainst.
Claim 6
Dependent Claim
20 words
A transducer as set forth in claim 1 wherein said temperature-compensating diaphragm is disposed outside one of said pressure-sensing diaphragms.
Claim 7
Dependent Claim
20 words
A transducer as set forth in claim 1 wherein said temperature-compensating diaphragm is disposed inside one of said pressure-sensing diaphragms.
Claim 8
Dependent Claim
22 words
A transducer as set forth in claim 1, wherein said temperature-compensating diaphragm is provided with an auxiliary capsule to increase its capacity.
Claim 9
Dependent Claim
23 words
A transducer as set forth in claim 1 wherein said pressure-sensing diaphragms are enclosed by covers to define pressure chambers having inlets thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |