US4960967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for protecting the poles of inductors and inductor equipped with such device
Assignee: INSTITUT DE RECHERCHES de la SIDERURGIE FRANCAISE (IRSID) VOIE ROMAINE
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Filing: 1989-04-29
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Granted: 1990-10-02
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Expires: 2009-04-29
Abstract
Abstract The device for protecting the poles of an electromagnetic inductor comprises a heat exchanger formed by one or more co-planar metal tubes (6) designed to allow the circulation of a cooling fluid therein and of such an arrangement that there is at most one electrical junction between any two tubes or tube elements. The exchanger is fastened to a rigid electrically insulating support plate (5) coated with refractory concrete (10) and covers the entire polar surface as far as the cowls (3). The exchanger can be shaped in the form of a series of alternating hairpins or in the form of a spiral with one or more branches. The device serves especially for protecting the poles of inductors used for the induction heating of metal products.
Inventors
- 👤 Marc Buffenoir
- 👤 Rene Pierret
- 👤 Jean Hellegouarc'h
- 👤 Gerard Prost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:46
CPC Classifications
H; H05; H05B; H05B1/00; H05B6/00; H05B6/02; H05B6/36; H05B6/42; F; F28; F28D; F28D7/00; F28D7/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
84 words
An electromagnetic indicator having poles with a polar face and a protective device for a polar face of each pole, said protective device comprising a heat exchanger comprising at least one non-magnetic metal tube, each tube being constituted by several tube elements joined end to end and arranged substantially in a same plane parallel with said polar face, and means for circulating a cooling fluid through said at least one tube, any two tube elements being electrically joined by at most one electrical junction.
Claim 2
Dependent Claim
84 words
An electromagnetic indicator having poles with a polar face and a protective device for a polar face of each pole, said protective device comprising a heat exchanger comprising at least one non-magnetic metal tube, each tube being constituted by several tube elements joined end to end and arranged substantially in a same plane parallel with said polar face, and means for circulating a cooling fluid through said at least one tube, any two tube elements being electrically joined by at most one electrical junction.
Claim 3
Dependent Claim
21 words
The inductor claimed in claim 1, wherein said heat exchanger is in the form of a series of alternately reversed hairpins.
Claim 4
Dependent Claim
21 words
The inductor claimed in claim 1, wherein said heat exchanger is in the form a spiral with at least one branch.
Claim 5
Dependent Claim
17 words
The inductor claimed in claim 1, wherein said heat exchanger is embedded in electrically insulating refractory material.
Claim 6
Dependent Claim
12 words
The inductor claimed in claim 4, wherein said material is refractory concrete.
Claim 7
Dependent Claim
51 words
The inductor claimed in claim 1, wherein blocks of electrically insulating refractory material are inserted between adjacent tube elements, said blocks being shaped so as to conform to external surfaces of said tube elements and to cover partially said tube elements so that said blocks jointly cover substantially the entire exchanger.
Claim 8
Dependent Claim
38 words
The inductor claimed in claim 4 or 6, wherein said at least one tube and said refractory material jointly form a composite panel of small thickness and of dimensions sufficient to cover said polar face of said pole.
Claim 9
Dependent Claim
24 words
The inductor claimed in claim 7, comprising a plate of material resistant to heat and thermal shocks covering one face of said refractory material.
Claim 10
Dependent Claim
14 words
The inductor claimed in claim 7, wherein said plate is made of glass-ceramic material.
Claim 11
Dependent Claim
29 words
The inductor claimed in claim 1, comprising means for fastening said heat exchanger to a rigid electrically insulating support plate, said fastening means being electrically insulated from one another.
Claim 12
Dependent Claim
18 words
The inductor claimed in claim 1, wherein said at least one tube is made of non-magnetic stainless steel.
Claim 13
Dependent Claim
18 words
The inductor claimed in claim 1, wherein said heat exchanger has a central supply of said cooling fluid.
Claim 14
Dependent Claim
10 words
The inductor claimed in claim 12, comprising a C-shaped yoke.
Claim 15
Dependent Claim
10 words
The inductor claimed in claim 12, comprising a U-shaped yoke.
Claim 16
Dependent Claim
22 words
The inductor claimed in claim 13 or 14 comprising an axial passage in an end of said yoke for said central supply.
Claim 17
Dependent Claim
19 words
The inductor claimed in claim 1, wherein said protective device sealingly covers in the entire surface of said pole.
Claim 18
Dependent Claim
18 words
The inductor claimed in claim 1, comprising electrically insulated means for fastening said protective device to said pole.
References Cited (Backward Citations)
US2819431A
Cited
US3295598A
Cited
US3437132A
Cited
US3763342A
Cited
US3713060A
Cited
US3818979A
Cited
US4532398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |