US3600945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-measuring system
Assignee: Linde GmbH
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Filing: 1969-05-01
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Granted: 1971-08-24
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Expires: 1989-05-01
Abstract
Abstract A differential-pressure measuring device for a head flow meter in which the pressure taps on either side of the orifice plate lead to a pressure-measuring device. The pressure taps include ducts of high thermal conductivity (e.g. copper or aluminum) which are maintained at a temperature above the boiling point of the liquid by a heating element, thermal conduction or the like, and inserts of low thermal conductivity between the ducts and the liquid chamber in the region of the point at which the taps are connected thereto. The high temperature gradient across the lowconductivity inserts maintains the phase boundary at a substantially constant position therein in spite of temperature and/or pressure variations in the chamber.
Inventors
- 👤 Heribert Wenzel
- 👤 Klaus Van Rinsum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:29
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/37; G01L; G01L11/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
In a system for the measurement of pressure in a liquid chamber with a pressure-measuring device, the improvement which comprises an upwardly directed pressure tap connecting said chamber with said device and including a duct of high-thermal conductivity between said device and said chamber; means to maintain said duct at a temperature above the boiling point of said liquid and above the temperature of said chamber; and an upright tubular insert of low-thermal conductivity between said duct and said chamber and communicating therewith for defining within said insert a phase boundary between said liquid and vapor in said duct whereby the location of said phase boundary is maintained substantially constant by the temperature gradient across said insert even during pressure fluctuations in said chamber.
Claim 2
Dependent Claim
124 words
In a system for the measurement of pressure in a liquid chamber with a pressure-measuring device, the improvement which comprises an upwardly directed pressure tap connecting said chamber with said device and including a duct of high-thermal conductivity between said device and said chamber; means to maintain said duct at a temperature above the boiling point of said liquid and above the temperature of said chamber; and an upright tubular insert of low-thermal conductivity between said duct and said chamber and communicating therewith for defining within said insert a phase boundary between said liquid and vapor in said duct whereby the location of said phase boundary is maintained substantially constant by the temperature gradient across said insert even during pressure fluctuations in said chamber.
Claim 3
Dependent Claim
42 words
The improvement defined in claim 1 wherein said chamber is subdivided into compartments by a partition and said device is responsive to the pressure differential across said partition, said system comprising a pressure tap of the said construction opening into each compartment.
Claim 4
Dependent Claim
22 words
The improvement defined in claim 2 wherein said inserts are provided directly at the junctions of said pressure taps with said compartment.
Claim 5
Dependent Claim
30 words
The improvement defined in claim 2, wherein said means comprises a mass of thermally conductive heat-storage material jointly mounted on said ducts proximally to their junctions with the respective inserts.
Claim 6
Dependent Claim
23 words
The improvement defined in claim 1, wherein said means further comprises means for heating said duct to said temperature above said boiling point.
Claim 7
Dependent Claim
49 words
The improvement defined in claim 5 wherein said means further includes a body of heat-storage material exposed to ambient temperature and in thermally conducting relationship with said duct, said chamber being at least partly enclosed with thermal insulation and said duct lying at least partly externally of said insulation.
Claim 8
Dependent Claim
18 words
The improvement defined in claim 5, wherein said means includes an electrical heating element juxtaposed with said duct.
Claim 9
Dependent Claim
17 words
The improvement defined in claim 5 wherein said means includes a heat sink connected with said duct.
Claim 10
Dependent Claim
41 words
The improvement defined in claim 5 wherein said duct is a relatively thick-walled tube composed of a material of high thermal conductivity and said insert is a relatively thin-walled tube composed of a material of lower thermal conductivity than said duct.
Claim 11
Dependent Claim
41 words
The improvement defined in claim 5 wherein said duct is a relatively thick-walled tube composed of aluminum, copper or an alloy thereof and said insert is a relatively thin-walled tube composed of austenitic or chromium nickel alloy steel or synthetic resin.
References Cited (Backward Citations)
US2703494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |