US4819487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure transducer
Assignee: Dynisco Instruments LLC
•
Filing: 1987-05-28
•
Granted: 1989-04-11
•
Expires: 2007-05-28
Abstract
Abstract A pressure transducer for in particular the measurement of relatively high pressures in the range of 10,000-50,000 psi and including an elongated frame having a capillary tube extending therethrough and employing a coupler at one end of the frame for sensing input pressure. A sensing member is provided disposed about the capillary tube at the other end of the frame and has, defined with the capillary tube, a sensing chamber in communication with the capillary tube. A recess is provided in the sensing member defining a relatively thin wall adjacent the annular sensing chamber. This wall has a pressure responsive sensing surface that extends substantially parallel to the capillary tube length and upon which strain gages are secured. A method as described for securing the capillary tube with the sensing member in a liquid tight manner.
Inventors
- 👤 William Wareham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:25
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/04; G01L19/0007; G01L19/0046; G01L9/00; G01L9/02; G01L9/04; G01L9/045
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
131 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed at the other end of the frame and having a passage therein for receiving the capillary tube, said sensing member and capillary tube defining therebetween a sensing chamber formed between said sensing member passage and said capillary tube, a liquid filling the capillary tube and sensing chamber, said sensing member further having means defining a sensing surface forming a relatively thin wall adjacent said sensing chamber, and means for sensing pressure at said wall.
Claim 2
Dependent Claim
131 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed at the other end of the frame and having a passage therein for receiving the capillary tube, said sensing member and capillary tube defining therebetween a sensing chamber formed between said sensing member passage and said capillary tube, a liquid filling the capillary tube and sensing chamber, said sensing member further having means defining a sensing surface forming a relatively thin wall adjacent said sensing chamber, and means for sensing pressure at said wall.
Claim 3
Dependent Claim
36 words
A pressure transducer as set forth in claim 1 wherein said relatively thin wall has a pressure responsive sensing surface and said means for sensing comprises at least one sensing gage disposed on said sensing surface.
Claim 4
Dependent Claim
23 words
A pressure transducer as set forth in claim 2 wherein said pressure responsive sensing surface extends substantially parallel to the capillary tube length.
Claim 5
Dependent Claim
157 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, said relatively thin wall having a pressure responsive sensing surface and said means for sensing comprising at least one sensing gauge disposed on said sensing surface, said pressure responsive sensing surface extending substantially parallel to the capillary tube length, said pressure responsive sensing surface being substantially flat.
Claim 6
Dependent Claim
157 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, said relatively thin wall having a pressure responsive sensing surface and said means for sensing comprising at least one sensing gauge disposed on said sensing surface, said pressure responsive sensing surface extending substantially parallel to the capillary tube length, said pressure responsive sensing surface being substantially flat.
Claim 7
Dependent Claim
28 words
A pressure transducer as set forth in claim 4 wherein the sensing member is substantially cylindrical and said recess forms a flat surface closely adjacent the capillary tube.
Claim 8
Dependent Claim
38 words
A pressure transducer as set forth in claim 1 wherein said capillary tube has a passage therethrough extending substantially transverse to the axis thereof and for permitting fluid communication between the capillary tube and said annular sensing chamber.
Claim 9
Dependent Claim
31 words
A pressure transducer as set forth in claim 6 wherein said annular sensing chamber is defined at least in part by a recess in the outer surface of the capillary tube.
Claim 10
Dependent Claim
30 words
A pressure transducer as set forth in claim 7 wherein the transverse hole in the capillary tube is at approximately a midpoint distance of the recess in the sensing member.
Claim 11
Dependent Claim
24 words
A pressure transducer as set forth in claim 1 wherein the capillary tube is secured at top and bottom ends of the sensing member.
Claim 12
Dependent Claim
19 words
A pressure transducer as set forth in claim 9 wherein the securing of the capillary tube is by welding.
Claim 13
Dependent Claim
141 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, said means for sensing comprising a pair of strain gauges disposed on a pressure responsive sensing surface of said thin wall and each overlying the center line of the capillary tube.
Claim 14
Dependent Claim
141 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, and means for sensing pressure at said wall, said means for sensing comprising a pair of strain gauges disposed on a pressure responsive sensing surface of said thin wall and each overlying the center line of the capillary tube.
Claim 15
Dependent Claim
30 words
A pressure transducer as set forth in claim 11 wherein there are also included two other substantially nonactive strain gages disposed outside of the position of the in-line strain gages.
Claim 16
Dependent Claim
117 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and a filler piece in the coupler chamber.
Claim 17
Dependent Claim
117 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and a filler piece in the coupler chamber.
Claim 18
Dependent Claim
25 words
A pressure transducer as set forth in claim 13 wherein said filler piece has a coefficient of expansion substantially less than that of the frame.
Claim 19
Dependent Claim
25 words
A pressure transducer as set forth in claim 1 in which said sensing member is adaptive for operation over a pressure range of 10,000-50,000 psi.
Claim 20
Dependent Claim
133 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means for securing the capillary tube at the top and bottom ends of the sensing member including annular weld beads at either end.
Claim 21
Dependent Claim
133 words
A pressure transducer comprising; an elongated frame having an elongated passage therethrough, a capillary tube extending through the frame passage and terminating at one end adjacent one end of the frame, a coupler at said one end of the frame and defining with the frame a chamber in communication with the capillary tube, a sensing member disposed about the capillary tube at the other end of the frame and including means defining an annular sensing chamber in fluid communication with the capillary tube, and means defining a recess in the sensing member forming a relatively thin wall adjacent said annular sensing chamber, means for sensing pressure at said wall, and means for securing the capillary tube at the top and bottom ends of the sensing member including annular weld beads at either end.
Claim 22
Dependent Claim
29 words
A pressure transducer as set forth in claim 16 wherein the gap between the capillary tube and the bore in the sensing member is on the order of 0.001".
References Cited (Backward Citations)
GB1110137A
Cited
US3349623A
Cited
US3678753A
Cited
DE2211609A1
Cited
US4369659A
Cited
US4679438A
Cited
US4680972A
Cited
US4702113A
Cited
US4712430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |