US2673921A - Mechanism for inductive heating of surfaces - Google Patents
Mechanism for inductive heating of surfaces Download PDFInfo
- Publication number
- US2673921A US2673921A US133207A US13320749A US2673921A US 2673921 A US2673921 A US 2673921A US 133207 A US133207 A US 133207A US 13320749 A US13320749 A US 13320749A US 2673921 A US2673921 A US 2673921A
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- United States
- Prior art keywords
- inductive heating
- secondary circuit
- circuit
- heating
- heat
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
- H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
Definitions
- those surfaces can be heated electrically by being developed as a short circuited secondary circuit of a transformer, in which the secondary circuit consists of one portion of low resistance and one portion of a higher resistance.
- the primary windings must be insulated heat resistant.
- the magnetic circuit is iron closed.
- the portion of the low resistance of the secondary circuit may also be laminated, should the opportunity arise, for avoiding losses, rising from displacement of current. With polyphase arrangement short circuit currents are running also between the dverent phases that the plate is heated uniformly.
- Fig. 1 shows schematically and in cross section one form of the improved arrangement
- Fig. 2 shows a similar View of a modified form thereof.
- the secondary circuit comprises the parts 4 of low resistance (good electrical conductivity) which are connected in good thermal conducting relationship with the part I of relatively lower electrical conductivity.
- the heat resistant and insulated primary windings 3 and the laminated magnetic legs 2 are connected with one another by yokes not shown.
- Fig. 2 an arrangement is shown which is particularly adapted for use in connection with chemical reactions in which evaporation must occur in a gaseous atmosphere.
- the U- shaped part of the secondary circuit may be used for preheating the gas.
- the U-shaped part of the secondary winding again contains the heat resistant insulated primary winding 3 and the laminated core 2.
- This U-shaped part consists of concentric walls 4 and 5 deiining an interspace 6 through which the gas to be heated passes from inlet port 8 to exit ports l.
- the inter-space may be composed of a number of parallel branches.
- the arrangement has the special advantage of a uniform and easily regulatable temperature of the evaporating surface, since the thermal inertia is Very low. It may also be used for heating the bottoms of vessels, and if the bottom surfaces thereof are vaulted, matters may be arranged .so that, for example, three fourths of the secondary heating surface may project into the interior of the vessel, whereby the heat transmitting surface is greatly increased.
- An electric induction heating apparatus comprising a closed laminated iron magnetic circuit, a primary coil wound about a part of said iron circuit, and a short-circuited secondary circuit disposed in linx-linking relationship to said iron circuit, said secondary circuit consisting of two series-connected portions of which a first portion is made of a material of good electrical conductivity and formed as a double-wall shell of U-shape cross-section, and the second portion is formed as a plate of material of relatively lower electrical conductivity in good thermal transmitting relationship to the legs of said first portion, whereby a major portion of the heat developed in said secondary circuit will be developed in said second portion, and means defining uid entrance and exit ports communicating .with the interspace of said shell.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
Description
March 30, 1954 c. c. scHRG MECHANISM FOR INDUCTIVE HEATING OF' SURFACES Filed Dec. l5. 1949 Fig.1
, Q .60]2, rj
Patented Mar. 30, 1954 OFFICE MECHANISM FOR INDUCTIVE HEATING F SURFACES Carl Christian Schrg, Frankfurt am Main Hochst, Germany Application December 15, 1949, Serial No. 133,207
Claims priority, application Germany December 20, 1948Y 1 Claim. (Cl. 219-1051) In applied chemistry hot surfaces are often coated with liquids in a thin layer to evaporate all components simultaneously for avoiding fractionizing. Frequently gas is added to the vapour during the evaporating process for the purpose of a chemical reaction. A uniform temperature of the hot evaporated surface that musi; be observed exactly is required to avoid encrusting or explosive danger. With surfaces heated by fire there is the already known danger of local overheating and on account of considerable inertia of heat of the whole system there is only a limited exactness of control. With steam heating steam of high temperature requires high pressures, thereupon thick Walls and consequently an inertia of heat rendering diicult control.
According to the present invention those surfaces can be heated electrically by being developed as a short circuited secondary circuit of a transformer, in which the secondary circuit consists of one portion of low resistance and one portion of a higher resistance. The primary windings must be insulated heat resistant. The magnetic circuit is iron closed. The portion of the low resistance of the secondary circuit may also be laminated, should the opportunity arise, for avoiding losses, rising from displacement of current. With polyphase arrangement short circuit currents are running also between the diilerent phases that the plate is heated uniformly.
The invention is clearly illustrated in the accompanying drawings, in which:
Fig. 1 shows schematically and in cross section one form of the improved arrangement, and
Fig. 2 shows a similar View of a modified form thereof.
Referring now to the accompanying drawings, particularly Fig. 1, the secondary circuit comprises the parts 4 of low resistance (good electrical conductivity) which are connected in good thermal conducting relationship with the part I of relatively lower electrical conductivity. in the parts 4 the heat resistant and insulated primary windings 3 and the laminated magnetic legs 2 are connected with one another by yokes not shown.
In Fig. 2, an arrangement is shown which is particularly adapted for use in connection with chemical reactions in which evaporation must occur in a gaseous atmosphere. Here, the U- shaped part of the secondary circuit may be used for preheating the gas. The U-shaped part of the secondary winding again contains the heat resistant insulated primary winding 3 and the laminated core 2. This U-shaped part consists of concentric walls 4 and 5 deiining an interspace 6 through which the gas to be heated passes from inlet port 8 to exit ports l. Obviously, the inter-space may be composed of a number of parallel branches.
The arrangement has the special advantage of a uniform and easily regulatable temperature of the evaporating surface, since the thermal inertia is Very low. It may also be used for heating the bottoms of vessels, and if the bottom surfaces thereof are vaulted, matters may be arranged .so that, for example, three fourths of the secondary heating surface may project into the interior of the vessel, whereby the heat transmitting surface is greatly increased.
I claim:
An electric induction heating apparatus comprising a closed laminated iron magnetic circuit, a primary coil wound about a part of said iron circuit, and a short-circuited secondary circuit disposed in linx-linking relationship to said iron circuit, said secondary circuit consisting of two series-connected portions of which a first portion is made of a material of good electrical conductivity and formed as a double-wall shell of U-shape cross-section, and the second portion is formed as a plate of material of relatively lower electrical conductivity in good thermal transmitting relationship to the legs of said first portion, whereby a major portion of the heat developed in said secondary circuit will be developed in said second portion, and means defining uid entrance and exit ports communicating .with the interspace of said shell.
CARL CHRISTIAN SCHRG.
References Cited in the file of this patent UNITED lSTATES PATENTS
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2673921X | 1948-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2673921A true US2673921A (en) | 1954-03-30 |
Family
ID=7996622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US133207A Expired - Lifetime US2673921A (en) | 1948-12-20 | 1949-12-15 | Mechanism for inductive heating of surfaces |
Country Status (1)
Country | Link |
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US (1) | US2673921A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3440384A (en) * | 1962-11-30 | 1969-04-22 | Charles F Schroeder | Electromagnetic unit |
EP0516881A1 (en) * | 1991-06-05 | 1992-12-09 | Hidec Corporation Ltd. | Low-frequency induction heater |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US477628A (en) * | 1892-06-21 | Electric | ||
US891657A (en) * | 1906-08-09 | 1908-06-23 | Arthur Francis Berry | Apparatus for the electrical production of heat for cooking and other purposes. |
US1052119A (en) * | 1911-10-30 | 1913-02-04 | John L Anderson | Universal electric induction heating and cooking element. |
DE628769C (en) * | 1933-11-25 | 1936-04-16 | Siemens Schuckertwerke Akt Ges | Electric heating plate that works according to the induction principle |
US2338236A (en) * | 1941-01-30 | 1944-01-04 | Gen Motors Corp | Domestic appliance |
US2407562A (en) * | 1942-08-17 | 1946-09-10 | Einar G Lofgren | Induction heater |
US2518683A (en) * | 1946-09-07 | 1950-08-15 | Ray E Haines | Electrically heated hot plate |
-
1949
- 1949-12-15 US US133207A patent/US2673921A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US477628A (en) * | 1892-06-21 | Electric | ||
US891657A (en) * | 1906-08-09 | 1908-06-23 | Arthur Francis Berry | Apparatus for the electrical production of heat for cooking and other purposes. |
US1052119A (en) * | 1911-10-30 | 1913-02-04 | John L Anderson | Universal electric induction heating and cooking element. |
DE628769C (en) * | 1933-11-25 | 1936-04-16 | Siemens Schuckertwerke Akt Ges | Electric heating plate that works according to the induction principle |
US2338236A (en) * | 1941-01-30 | 1944-01-04 | Gen Motors Corp | Domestic appliance |
US2407562A (en) * | 1942-08-17 | 1946-09-10 | Einar G Lofgren | Induction heater |
US2518683A (en) * | 1946-09-07 | 1950-08-15 | Ray E Haines | Electrically heated hot plate |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3440384A (en) * | 1962-11-30 | 1969-04-22 | Charles F Schroeder | Electromagnetic unit |
EP0516881A1 (en) * | 1991-06-05 | 1992-12-09 | Hidec Corporation Ltd. | Low-frequency induction heater |
US5270511A (en) * | 1991-06-05 | 1993-12-14 | Nikko Corporation Ltd. | Low-frequency induction heater employing stainless steel material as a secondary winding |
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