Patent US3704357A successfully refreshed from Google Patents.
US3704357A
Expired / Lapsed
US
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Inductor arrangement for induction heating application particularly for brazing presses
Assignee: TRAITEMENTS ELECTROLYTIQUES
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Filing: 1971-12-29
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Granted: 1972-11-28
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Expires: 1991-12-29
Abstract
Abstract An inductor arrangement for induction heating of one or more flat circular plates of different diameters including a first set of windings always active during operation of the brazing press and a second set of windings selectively inserted in series with the first set. The first set comprises a central portion including on or more small diameter pancake coils covering the center of the plate to be heated and a peripheral portion made up of a flat annular spiral surrounding the central portion and further away from this plate than the latter. The second set comprises a flat annular spiral each of whose turns is tapped so as to insert that one or pair of turns which faces the peripheral zone of the plate to be heated in series with the first set.
Inventors
- 👤 Jean Moulin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:03
CPC Classifications
H; H01; H01F; H01F5/00; B; B23; B23K; B23K1/00; B23K1/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
291 words
Inductor arrangement for induction heating particularly for the brazing of one or more flat circular plates of different diameters comprising : a first set of windings, whereof all are permanently inserted within the path of a high-frequency current during heating operation, including : a center portion made up from one or more parallel superposed small diameter flat spiral coils parallel to and located close to said plates for heating substantially the central zone thereof, and a peripheral portion made up from a first annular large diameter flat spiral coil having an inner diameter greater than the outer one of said center portion coil and an outer diameter corresponding substantially to that of the largest plate to be heated, said peripheral coil being parallel to and located further away from said plates than said central portion, said central and peripheral portion coils being series connected : a second set of windings made up from a second annular large diameter flat spiral coil including a plurality of turns and surrounding said center portion, said second coil having an inner diameter greater than the outer one of said center portion and an outer diameter corresponding substantially to that of the largest plate to be heated and being located between said first annular coil and said plates, each of said turns of said second coil having a tap for respectively selectively inserting one or more of said turns, located in the vicinity of the edges of said plates, in series with said first set through connecting means, whereby the high-frequency current flowing through the totality of turns of said first sets and through the active ones of said second set is such that the magnetic fields engendered thereby are parallel and of the same direction.
Claim 2
Dependent Claim
291 words
Inductor arrangement for induction heating particularly for the brazing of one or more flat circular plates of different diameters comprising : a first set of windings, whereof all are permanently inserted within the path of a high-frequency current during heating operation, including : a center portion made up from one or more parallel superposed small diameter flat spiral coils parallel to and located close to said plates for heating substantially the central zone thereof, and a peripheral portion made up from a first annular large diameter flat spiral coil having an inner diameter greater than the outer one of said center portion coil and an outer diameter corresponding substantially to that of the largest plate to be heated, said peripheral coil being parallel to and located further away from said plates than said central portion, said central and peripheral portion coils being series connected : a second set of windings made up from a second annular large diameter flat spiral coil including a plurality of turns and surrounding said center portion, said second coil having an inner diameter greater than the outer one of said center portion and an outer diameter corresponding substantially to that of the largest plate to be heated and being located between said first annular coil and said plates, each of said turns of said second coil having a tap for respectively selectively inserting one or more of said turns, located in the vicinity of the edges of said plates, in series with said first set through connecting means, whereby the high-frequency current flowing through the totality of turns of said first sets and through the active ones of said second set is such that the magnetic fields engendered thereby are parallel and of the same direction.
Claim 3
Dependent Claim
56 words
Arrangement as claimed in claim 1, wherein the center portion comprises two superposed parallel flat spirals of the pancake type having substantially the same number of turns and disposed as close to each other as possible, said two spirals being series connected and one extremity of the spiral which is closest to said plates being grounded.
Claim 4
Dependent Claim
63 words
Arrangement as claimed in claim 1, wherein said first and second sets of windings are made up from hollow tubes of a conducting metal and cooled by a fluid flowing through one or more cooling circuits comprising said tubes, and wherein the electrical and hydraulic interconnection of said coils is carried out by means of stubs made of tubes of the same kind.
Claim 5
Dependent Claim
26 words
Arrangement as claimed in claim 3, wherein said connecting means are made of hollow conducting metal tubes and constitute an integral part of said cooling circuit.
Claim 6
Dependent Claim
30 words
Arrangement as claimed in claim 3, wherein said center portion spiral coils make up a separate first cooling circuit independent from the one cooling said first and second annular coils.
Claim 7
Dependent Claim
48 words
Arrangement as claimed in claim 1, wherein said first and said second annular coils are each made up from a plurality of concentric circular turns of metal tubing each being connected to the adjacent one through a tubular stub portion ensuring simultaneously an electric and a hydraulic connection.
Claim 8
Dependent Claim
23 words
Arrangement as claimed in claim 1, wherein different spirals are recessed into blocks of rigid electrically insulating material such as resinous glass fiber.
Claim 9
Dependent Claim
17 words
Arrangement as claimed in claim 1 wherein it is embedded in a hardenable electrically insulating plastic material.
References Cited (Backward Citations)
GB1048082A
Cited
GB1064903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |