Patent US3369771A successfully refreshed from Google Patents.
Patent US4773275A successfully refreshed from Google Patents.
US4773275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal for ceramic flow tube
Assignee: Schneider Electric Systems USA Inc
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Filing: 1986-05-27
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Granted: 1988-09-27
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Expires: 2006-05-27
Abstract
Abstract A seal for ceramic flow tubes resistent to high temperature, pressure and corrosion factors is made by fusing a first polymer to the ceramic as a binding layer, fusing to the first layer a second flexible polymer layer chemically and temperature resistent to the process fluid, and holding the two layers under a resilient loading. The seal is highly leak tight, chemically durable, inexpensive to produce and repairable without sacrificing valuable components.
Inventors
- 👤 Richard W. Kalinoski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:05
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/584
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
232 words
An electrode sealing arrangement in an electromagnetic flowmeter including a ceramic flow tube, comprising: a. an elongated electrode having a first end, a second end, and an elongated shaft connecting said ends, wherein said first end includes an electrode head having an at least partially exposed first surface for contacting a fluid and a second, sealing surface at least partially circumjacent said shaft first end said second end having a first force application point lying along the elongated shaft; b. said ceramic flow tube having exterior and interior walls, an electrode shaft passageway therebetween, and a seal area on the interior wall circumjacent said shaft passageway; c. polymeric gasket means having multiple layers including a first polymeric layer with a first outer seal surface, and a second layer with a second outer seal surface, said layers being intimately bonded; and d. spring force means for applying a substantially linear force between said first and second force application points; wherein the seal first surface is hot melt bonded to the flow tube seal area, the electrode shaft extends through the flow tube shaft passageway with the electrode head inside the flow tube and the second end extending beyond the flow tube exterior wall, wherein said second force application point is external to the flow tube, and the spring means compresses the seal between the electrode head and the tube interior wall seal area.
Claim 2
Dependent Claim
232 words
An electrode sealing arrangement in an electromagnetic flowmeter including a ceramic flow tube, comprising: a. an elongated electrode having a first end, a second end, and an elongated shaft connecting said ends, wherein said first end includes an electrode head having an at least partially exposed first surface for contacting a fluid and a second, sealing surface at least partially circumjacent said shaft first end said second end having a first force application point lying along the elongated shaft; b. said ceramic flow tube having exterior and interior walls, an electrode shaft passageway therebetween, and a seal area on the interior wall circumjacent said shaft passageway; c. polymeric gasket means having multiple layers including a first polymeric layer with a first outer seal surface, and a second layer with a second outer seal surface, said layers being intimately bonded; and d. spring force means for applying a substantially linear force between said first and second force application points; wherein the seal first surface is hot melt bonded to the flow tube seal area, the electrode shaft extends through the flow tube shaft passageway with the electrode head inside the flow tube and the second end extending beyond the flow tube exterior wall, wherein said second force application point is external to the flow tube, and the spring means compresses the seal between the electrode head and the tube interior wall seal area.
Claim 3
Dependent Claim
22 words
The sealing arrangement of claim 1 wherein the gasket material is substantially impervious to the process fluid in the operative temperature range.
Claim 4
Dependent Claim
39 words
The sealing arrangement of claim 1 wherein the gasket is bonded to the flow tube with a force greater than any stress between the tube and the gasket due to thermal expansion over the range of tube operation temperatures.
Claim 5
Dependent Claim
33 words
The sealing arrangement of claim 1 wherein the volume of the first material is at least as great as the volume of any surface variations of the flow tube over the seal area.
Claim 6
Dependent Claim
20 words
The sealing arrangement of claim 1 wherein the first material intimately fills surface variations in the flow tube seal area.
Claim 7
Dependent Claim
22 words
The sealing arrangement of claim 1 wherein the first material has a melting temperature higher than the highest temperature of expected operation.
Claim 8
Dependent Claim
12 words
The sealing arrangement of claim 1 wherein the first material is perfluoroalkoxyethylene.
Claim 9
Dependent Claim
22 words
The sealing arrangement of claim 1 wherein the second material is substantially impervious to the process fluid in the operative temperature range.
Claim 10
Dependent Claim
12 words
The sealing arrangement of claim 1 wherein the second material is polymeric.
Claim 11
Dependent Claim
12 words
The sealing arrangement of claim 1 wherein the second material is polytetrafluoroethylene.
Claim 12
Dependent Claim
49 words
The sealing arrangement of claim 1 wherein the flow tube and the electrode are subject to thermal expansion, and the spring force means provides a range of displacement greater than the greatest expansion due to thermal expansion of the flow tube and the electrode, and creep of the gasket.
Claim 13
Dependent Claim
117 words
An electrode sealing arrangement in an electromagnetic flowmeter, comprising an electrode with an elongated shaft, a ceramic flow tube having interior and exterior walls and an electrode shaft passageway therebetween, a multiple layer seal, and tensioning apparatus to compress the seal between the flow tube interior wall and the electrode wherein the seal includes a first surface of a first polymeric material bonded to a second material having a second face, said seal first surface being hot melt bonded to the flow tube interior around said electrode shaft passageway, said seal second surface is in intimate contact with the electrode, and said tensioning means retains the tube interior wall, the seal, and the electrode in sealing engagement.
Claim 14
Dependent Claim
117 words
An electrode sealing arrangement in an electromagnetic flowmeter, comprising an electrode with an elongated shaft, a ceramic flow tube having interior and exterior walls and an electrode shaft passageway therebetween, a multiple layer seal, and tensioning apparatus to compress the seal between the flow tube interior wall and the electrode wherein the seal includes a first surface of a first polymeric material bonded to a second material having a second face, said seal first surface being hot melt bonded to the flow tube interior around said electrode shaft passageway, said seal second surface is in intimate contact with the electrode, and said tensioning means retains the tube interior wall, the seal, and the electrode in sealing engagement.
Claim 15
Dependent Claim
39 words
The sealing arrangement of claim 12 wherein the gasket is bonded to the flow tube with a force greater than any stress between the tube and the gasket due to thermal expansion over the range of tube operation temperatures.
Claim 16
Dependent Claim
20 words
The sealing arrangement of claim 12 wherein the first material intimately fills surface variations in the flow tube seal area.
Claim 17
Dependent Claim
22 words
The sealing arrangement of claim 12 wherein the first material has a melting temperature higher than the highest temperature of expected operation.
Claim 18
Dependent Claim
12 words
The sealing arrangement of claim 12 wherein the first material is perfluoroalkoxyethylene.
Claim 19
Dependent Claim
22 words
The sealing arrangement of claim 12 wherein the second material is substantially impervious to the process fluid in the operative temperature range.
Claim 20
Dependent Claim
12 words
The sealing arrangement of claim 1 wherein the second material is polymeric.
Claim 21
Dependent Claim
12 words
The sealing arrangement of claim 12 wherein the second material is polytetrafluoroethylene.
Claim 22
Dependent Claim
36 words
The sealing arrangement of claim 12 wherein the tensioning apparatus provides a range of displacement greater than the greatest expansion due to thermal expansion of the flow tube and the electrode, and creep of the gasket
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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |