US1805908A - Electrical inductive and resistance heating device - Google Patents
Electrical inductive and resistance heating device Download PDFInfo
- Publication number
- US1805908A US1805908A US415346A US41534629A US1805908A US 1805908 A US1805908 A US 1805908A US 415346 A US415346 A US 415346A US 41534629 A US41534629 A US 41534629A US 1805908 A US1805908 A US 1805908A
- Authority
- US
- United States
- Prior art keywords
- resistance heating
- heating device
- electrical
- electrical inductive
- resistance
- Prior art date
- 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.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 title description 4
- 230000001939 inductive effect Effects 0.000 title description 2
- 239000000463 material Substances 0.000 description 7
- 239000004020 conductor Substances 0.000 description 5
- 239000010425 asbestos Substances 0.000 description 4
- 229910052895 riebeckite Inorganic materials 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000002657 fibrous material Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 241001464377 Resia Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/18—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being embedded in an insulating material
Definitions
- the present invention relates to aheatresisting electrical coil and to electrical resistance heating devices.
- windings ofelectrical indiiction ap- 5 paratus are in some cases liable to be exposed to a temperature which is so high that normal insulating materials, such as cotton, paper or the like cannot be used.
- the wires have therefore been taped with as- .10 bestos which, however, at high temperatures,
- temperatures of about 750C. can be attained inelectrical 2o resistance windings, as well as in induction coils, without causing a loss in mechanical and electrical strength of the insulation by impregnating the winding, which has been insulated with asbestos or a similar fibrous material, with a cement-mass substantially.
- the finished coil is caused to harden for some hours at a normal temperature (about 20 C. to ⁇ (1); 1t is 40 then dried for sometime, dependlng upon the thickness, at about 200 C. until thewater is completely expelled.
- a normal temperature about 20 C. to ⁇ (1); 1t is 40 then dried for sometime, dependlng upon the thickness, at about 200 C. until thewater is completely expelled.
- the coil has to be used at temperatures above 400 C. it has been found suitable to boil it, after it v i has been hardened for about 20 hours, in
- cement-masses containing silicofluorides are also very suitable for this kind of construction.
- the resistance material is introduced into the cement-mass which has been stirred to a paste.
- the further treatment is as described above.
- a heat-resisting electrical coil consisting of a layer of an insulating fibrgus material, said insulating layer being impregnated with a cementitious substance containing a silicofluoride and an electrical conductor embedded in said layer.
- a heat-resisting electrical coil consisting of a layer of asbestos, said layer being impregnated with a cementitious substance containing a-silicofiuoride and an electrical conductor embedded in said layer.
- An electrical resistance heatin device comprising a body to be heated,'a yer of insulating cementitious material surrounding at least part of said body and a resistance coil of an electrically conductive material,
- said insulating cementitious material being embedded in said insulating cementitious material, said insulating cementitious material being characterized by the presence of a silicofluoride therein.
- An electrical resistance heath? device com irising a body to be heated, a ayer of insu ating cementitious material surrounding at least part of said body, and a-resistance coil consisting of anelectrically conductive material and a layer of insulating fibrous material surrounding said conductive material, said insulating material and said cementitious material being characterized by the presence of a silicofluoride therein.
Landscapes
- Insulating Of Coils (AREA)
- Resistance Heating (AREA)
Description
I Patented May 19, 1931 UNITED STATES PATENT OFFICE I EMII: FENDT AND KARL $036M, OF FRANKI'ORT-ON-THE-KAIN-KOGHST, GERMANY,
ASSIGNORS TO I. G. FABBENINDUSTB-IE AKTIENGESELLSCHAIT, OF ERANKFOBT- QN-THE-MAIN, GERMANY ELECTRICAL INDUCTIVE AND RESISTANCE HEATING DEVICE No Drawing. Application filed December 19, 1928,8eria1 No. 415,346, and in Germany December 28, 1928.
The present invention relates to aheatresisting electrical coil and to electrical resistance heating devices.
The windings ofelectrical indiiction ap- 5 paratus are in some cases liable to be exposed to a temperature which is so high that normal insulating materials, such as cotton, paper or the like cannot be used. The wires have therefore been taped with as- .10 bestos which, however, at high temperatures,
at about 300 C. loses its mechanical strength and begins to disintegrate. It has been tried to prevent this by impregnating the asbestos band with water glass, but this means also failed at temperatures of about 450 C. be'-- cause the insulation was apt to fuse, causing a short-circuit.
According to this invention temperatures of about 750C. can be attained inelectrical 2o resistance windings, as well as in induction coils, without causing a loss in mechanical and electrical strength of the insulation by impregnating the winding, which has been insulated with asbestos or a similar fibrous material, with a cement-mass substantially.
with the cement-mass. The finished coil is caused to harden for some hours at a normal temperature (about 20 C. to {(1); 1t is 40 then dried for sometime, dependlng upon the thickness, at about 200 C. until thewater is completely expelled. In case the coil has to be used at temperatures above 400 C. it has been found suitable to boil it, after it v i has been hardened for about 20 hours, in
ordinary water in order to remove the resia layer of asbestos which has been likewise impregnated with the cement-mass.
In making heating plates in particular,
the resistance winding is often directly pressed into the clayey mass. Cement-masses containing silicofluorides are also very suitable for this kind of construction. The resistance material is introduced into the cement-mass which has been stirred to a paste. The further treatment is as described above.
We claim:
1. A heat-resisting electrical coil consisting of a layer of an insulating fibrgus material, said insulating layer being impregnated with a cementitious substance containing a silicofluoride and an electrical conductor embedded in said layer. v
2. A heat-resisting electrical coil consisting of a layer of asbestos, said layer being impregnated with a cementitious substance containing a-silicofiuoride and an electrical conductor embedded in said layer.
3. An electrical resistance heatin device comprising a body to be heated,'a yer of insulating cementitious material surrounding at least part of said body and a resistance coil of an electrically conductive material,
embedded in said insulating cementitious material, said insulating cementitious material being characterized by the presence of a silicofluoride therein.
4. An electrical resistance heath? device com irising a body to be heated, a ayer of insu ating cementitious material surrounding at least part of said body, and a-resistance coil consisting of anelectrically conductive material and a layer of insulating fibrous material surrounding said conductive material, said insulating material and said cementitious material being characterized by the presence of a silicofluoride therein.
In testimony whereof, we aifix our signatures.
EMIL FENDT. KARL SGHORG.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1805908X | 1928-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1805908A true US1805908A (en) | 1931-05-19 |
Family
ID=7744101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US415346A Expired - Lifetime US1805908A (en) | 1928-12-28 | 1929-12-19 | Electrical inductive and resistance heating device |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1805908A (en) |
-
1929
- 1929-12-19 US US415346A patent/US1805908A/en not_active Expired - Lifetime
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