EP2034797A2 - Electric resistance heating assembly - Google Patents

Electric resistance heating assembly Download PDF

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Publication number
EP2034797A2
EP2034797A2 EP08163921A EP08163921A EP2034797A2 EP 2034797 A2 EP2034797 A2 EP 2034797A2 EP 08163921 A EP08163921 A EP 08163921A EP 08163921 A EP08163921 A EP 08163921A EP 2034797 A2 EP2034797 A2 EP 2034797A2
Authority
EP
European Patent Office
Prior art keywords
resistance
wire
micanite
ceramic body
plates
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.)
Granted
Application number
EP08163921A
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German (de)
French (fr)
Other versions
EP2034797A3 (en
EP2034797B1 (en
Inventor
Levente Vargha
Nicolae-Horia Calburean
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scel-Co Sa
Original Assignee
Scel-Co Sa
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Publication date
Application filed by Scel-Co Sa filed Critical Scel-Co Sa
Priority to PL08163921T priority Critical patent/PL2034797T3/en
Publication of EP2034797A2 publication Critical patent/EP2034797A2/en
Publication of EP2034797A3 publication Critical patent/EP2034797A3/en
Application granted granted Critical
Publication of EP2034797B1 publication Critical patent/EP2034797B1/en
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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/20Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • H05B3/283Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material the insulating material being an inorganic material, e.g. ceramic

Definitions

  • the invention relates to an electrical resistance heating assembly for average temperatures, designed to function at temperatures of maximum 500 degrees Celsius, resistance that is used in thermo techniques.
  • thermo-insulating layer The electric resistances known so far have the disadvantage of the heat loss due to the only thermo-insulating layer, they are fragile, have a higher thermic inertia, which implies a higher energy consumption, have a high sensitivity to humidity, there is a possibility that the wire breaks because of electric shocks, since the insulation material can move, there is the risk of the apparition of corrugations due to distortions from the heat when the coverage area of the heating element is not sufficiently thick.
  • the technical problem solved by the invention consists in the supplementary insulation of the conductive parts and the protection against the electric shocks and eliminates the disadvantages mentioned above by constructing an electric resistance heating which functions at temperatures of maximum 500 degrees Celsius, which comprises a ceramic body made of no hydroscopic material, 0% porosity, inside which a resistance sub -assembly is placed between two micanite plates, where the resistance subassembly itself comprises a first first micanite support which has a KANTHAL D wire wrapped around itself and a second micanite support, the ends of the wire being insulated by the two micanite plates, the charging of the electric resistance being done through two electrical, flexible cables having a double thermo resistant insulation, the connection to the ends of the Khanthal being done in such a way that the non insulated ends are fasten between the two micanite plates, the ceramic body having its ends filled with a thermo- resistant adhesive.
  • the electric resistance heating according to the invention which operates at temperatures of maximum 500 degrees Celsius comprises a ceramic body 1 of rectangular shape, which has applied in its longitudinal section an almost rectangular cut a, where the ceramic body is made of no hydroscopic material, 0% porosity, for example -cordierite. Inside the cut a, the resistance subassembly is mounted between two micanite plates 2.
  • the resistance subassembly a comprises a first support 3 of rectangular shape made of micanite. On the lateral surfaces, lengthwise, the support 3 has applied on it some ditches b of 0,5 mm depth on which a resistance wire, preferably, a Kanthal D wire 4 is wrapped around. On the ends of the support 3 are applied some apertures c through which the wire 4 crosses and a d aperture for each.
  • a second support 5 made of micanite is disposed, through the apertures c of which the Kanthal D wire 4 is also introduced, to mechanically fasten the supports.
  • the two supports 3 and 5 are next to each other and mounted between two micanite 2 insulating plates, the assembly being solidarized by capsules 6 which penetrate the apertures d.
  • the ends of the wire 4 are fastened by the two crimps 7 and are insulated by the two micanite plates 2 in between which the subassembly A is positioned.
  • the charging of the electrical resistance is done through two electrical, flexible cables 8 which are insulated with double thermo resistant insulation.
  • the ends of the ceramic body 1 are filled with a temperature resistant silicon adhesive 10.
  • the electrical resistance according to the invention is a class II device, where the protection against the electric shocks is secured not only by the basic insulation achieved by the two micanite plates but also through the ceramic body 1, made of cordierite, a no hydroscopic material and the temperature resistant adhesive 10 which insures the double protection of the device.
  • the Kanthal D wire 4 is an internationally accepted as a standard descriptive term which has acquired a precise meaning.
  • the Kanthal D wire 4 concerns a specific class of resistance wires produced by the company "KanthalTM" (Address: Kanthal, Box 502, SE-734 27 Hallstahammar, Sweden, phone : +46 220 210 00; telefax: +46 220 163 50; e-mail: info@kanthal.com ; web-page: www.kanthal.com) and described on page 21 of the Kanthal Handbook entitled “Resistance Heating Alloys and Systems for Industrial Furnaces” (for more details, see web-page: http://hitempproducts.thomasnet.com/Asset/The-Kanthal-Furnace-Mini-Handbook---Metric-version-.pdf ) as mentioned below: KANTHAL D Wire and strip.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Resistance Heating (AREA)

Abstract

According to the invention, the said assembly comprises a ceramic body (1) inside of which an aperture is cut, in which a resistance subassembly (A) is mounted and is fastened between two micanite plates (2), the resistance subassembly (A) comprising a first micanite support which has a Kanthal D wire wrapped around it and a second micanite support, the ends of the wire being insulated through the two micanite plates (2) in between which the subassembly (A) is displayed, the charging of the electric resistance being effected through two cables (8) with a double thermo resistant insulation (9), the connection of the ends of the Kanthal wire being done in such a way that its noninsulated ends are fastened between the two micanite insulated plates (2), the ceramic body (1) having its filled with a thermo-resistant adhesive.

Description

  • The invention relates to an electrical resistance heating assembly for average temperatures, designed to function at temperatures of maximum 500 degrees Celsius, resistance that is used in thermo techniques.
  • At present, there are already known electric resistances that use ceramic material or hard glass as electric insulators. The heating elements are either placed in the interior of these ceramic materials or inserted through holes in the electric insulator. This type of electric resistance implies a higher consume of electric current and have a difficult production technology, considering that a high precision of execution is demanded. In addition, because of the contact with the air, the heating element can oxidize, especially in an average working time.
  • An electrical resistance which functions at temperatures up to 1000 degrees Celsius is known from the Romanian Patent RO 85804 , which comprises a ceramic body having in interior two longitudinal apertures in which the heating element is inserted, the heating element being coated in glass which is used as an electric insulator, temperature transfer mass and as tightening and fastening mass at the same time, while the ceramic body has a layer of cement at the ends. The connection with the power supply is made with two copper conductors which are partially coated in fluid glass.
  • Another electrical resistance is known from the Romanian Patent RO 81149 , which comprises a heating element welded by two copper conductors which connect with the control circuit, the electrical insulation being made of a glass wire wrapped around the heating element and around the two conductors and joined together through an adhesive. In another assembly alternative, the electric insulation is achieved through a pipe of fiber glass web, where the pipe has its ends solidarized through the heating and melting of the glass wires.
  • As far as the construction method is concerned, all the heating types already existent on the market are made of 2 main parts: a ceramic body made of hydroscopic material, 30% porosity and a resistance subassembly. The resistance is made of circular cross section wire, spirally wrapped at a 3 mm diameter, and it is rigidified with heat-insulation sand, whereas the free apertures are covered over with refractory adhesive. The protection against electric shocks is assured by the basic insulation.
  • The electric resistances known so far have the disadvantage of the heat loss due to the only thermo-insulating layer, they are fragile, have a higher thermic inertia, which implies a higher energy consumption, have a high sensitivity to humidity, there is a possibility that the wire breaks because of electric shocks, since the insulation material can move, there is the risk of the apparition of corrugations due to distortions from the heat when the coverage area of the heating element is not sufficiently thick.
  • The technical problem solved by the invention consists in the supplementary insulation of the conductive parts and the protection against the electric shocks and eliminates the disadvantages mentioned above by constructing an electric resistance heating which functions at temperatures of maximum 500 degrees Celsius, which comprises a ceramic body made of no hydroscopic material, 0% porosity, inside which a resistance sub -assembly is placed between two micanite plates, where the resistance subassembly itself comprises a first first micanite support which has a KANTHAL D wire wrapped around itself and a second micanite support, the ends of the wire being insulated by the two micanite plates, the charging of the electric resistance being done through two electrical, flexible cables having a double thermo resistant insulation, the connection to the ends of the Khanthal being done in such a way that the non insulated ends are fasten between the two micanite plates, the ceramic body having its ends filled with a thermo- resistant adhesive.
  • The electrical resistance according to this invention is used in the area of thermo techniques and has the following advantages:
    • ○ double protection against electric shocks (insulation class 2)
    • ○ higher safety in exploitation
    • ○ reduces inertia to heat, which implies a low energy consumption
    • ○ good control of the temperature
    • ○ the operating average time is long , induced by the fact that the heating element doesn't get oxidized, since it is not in contact with the air.
    • ○ The construction is simple and as a consequence, the setting up, the maintenance and the exploitation are easy.
    • ○ High thermic and energy efficiency due to an adequate thermic insulation
  • Below is a presentation by way of example of the invention in connection with Figs 1-10 which represent:
    • Figure 1- front view and partial section of the heating electric resistance
    • Figure 2- lateral view of the electric resistance in fig. 1
    • Figure 3- front view of the first support for the Kanthal D wire
    • Figure 4- detail D in fig 3.
    • Figure 5- front view of the second support for the Kanthal D wire
    • Figure 6- front view of the resistance subassembly
    • Figure 7- view of the insulation plate
    • Figure 8- the resistance subassembly mounted on the insulation plate
    • Figure 9- lateral view and cross section of the ceramic body
    • Figure 10- cross section of the capsule
  • The electric resistance heating according to the invention, which operates at temperatures of maximum 500 degrees Celsius comprises a ceramic body 1 of rectangular shape, which has applied in its longitudinal section an almost rectangular cut a, where the ceramic body is made of no hydroscopic material, 0% porosity, for example -cordierite. Inside the cut a, the resistance subassembly is mounted between two micanite plates 2. the resistance subassembly a comprises a first support 3 of rectangular shape made of micanite. On the lateral surfaces, lengthwise, the support 3 has applied on it some ditches b of 0,5 mm depth on which a resistance wire, preferably, a Kanthal D wire 4 is wrapped around. On the ends of the support 3 are applied some apertures c through which the wire 4 crosses and a d aperture for each.
  • Next to the support 3, a second support 5 made of micanite is disposed, through the apertures c of which the Kanthal D wire 4 is also introduced, to mechanically fasten the supports. The two supports 3 and 5 are next to each other and mounted between two micanite 2 insulating plates, the assembly being solidarized by capsules 6 which penetrate the apertures d.
  • The ends of the wire 4 are fastened by the two crimps 7 and are insulated by the two micanite plates 2 in between which the subassembly A is positioned. The charging of the electrical resistance is done through two electrical, flexible cables 8 which are insulated with double thermo resistant insulation.
  • After mounting the subassembly A in the cut a, the ends of the ceramic body 1 are filled with a temperature resistant silicon adhesive 10.
  • The electrical resistance according to the invention is a class II device, where the protection against the electric shocks is secured not only by the basic insulation achieved by the two micanite plates but also through the ceramic body 1, made of cordierite, a no hydroscopic material and the temperature resistant adhesive 10 which insures the double protection of the device.
  • The Kanthal D wire 4 is an internationally accepted as a standard descriptive term which has acquired a precise meaning. In fact, the Kanthal D wire 4 concerns a specific class of resistance wires produced by the company "Kanthal™" (Address: Kanthal, Box 502, SE-734 27 Hallstahammar, Sweden, phone : +46 220 210 00; telefax: +46 220 163 50; e-mail: info@kanthal.com; web-page: www.kanthal.com) and described on page 21 of the Kanthal Handbook entitled "Resistance Heating Alloys and Systems for Industrial Furnaces" (for more details, see web-page: http://hitempproducts.thomasnet.com/Asset/The-Kanthal-Furnace-Mini-Handbook---Metric-version-.pdf) as mentioned below:
    KANTHAL D
    Wire and strip. Standard stock items.
    Resistivity 1.35 Ω mm2m-1. Density 7.25 g cm-3. To obtain resistivity at working
    temperature, multiply by factor Ct in following table.
    °C 20 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300
    Ct 1.00 1.00 1.01 1.01 1.02 1.03 1.04 1.05 1.06 1.06 1.07 1.07 1.08 1.08
    Wire dia mm Resistance Ω/m 20°C Weight g/m cm2/Ω 20°C Strip*) WxT mm Resistance Ω/m 20°C Weight g/m cm2/Ω 20°C
    1.0 1.72 5.7 18.3 5.0x0.1 2.70 3.6 43
    1.1 1.42 6.9 24.3 5.0x0.2 1.35 7.3 76
    1.2 1.19 8.2 31.6 5.0x0.3 0.900 10.9 118
    1.3 1.02 9.6 40.2 5.0x0.4 0.657 14.5 160
    1.4 0.877 11.2 50.2 10.0x1.2 0.113 87 1990
    1.5 0.765 12.8 61.7 12.0x1.2 0.0938 104 2820
    1.6 0.671 14.6 74.9 15.0x1.2 0.0750 131 4320
    1.7 0.595 16.5 89.8 15.0x1.5 0.0600 163 5500
    1.8 0.531 18.4 107 20.0x1.5 0.0450 218 9560
    2.0 0.430 22.8 146 15.0x2.0 0.0450 218 7560
    2.5 0.275 35.6 286 20.0x2.0 0.0338 290 13000
    2.8 0.219 44.6 401 25.0x2.0 0.0270 363 20000
    3.0 0.191 51.2 493 20.0x2.5 0.0270 363 16700
    3.25 0.163 60.1 627
    3.5 0.140 89.8 784
    3.75 0.122 80.1 964
    4.0 0.107 91.1 1170
    4.25 0.0952 103 1403
    4.5 0.0849 115 1666
    4.75 0.0762 128 1959
    5.0 0.0688 142 2285
    5.5 0.0568 172 3041
    6.0 0.0477 205 3948
    6.5 0.0407 241 5019
    7.35 0.0318 308 7257
    8.0 0.0269 364 9358

Claims (2)

  1. Electric resistance heating assembly, comprising a ceramic body and a resistance assembly, made of circular section wire which is temperature insulated, the free apertures of the ceramic body being filled with adhesive, characterized in that in view to the good functioning at temperatures of maximum 500 degrees Celsius, the resistance comprising a ceramic body (1), of rectangular shape, made of no hydroscopic material, 0% porosity, inside of which a rectangular aperture (a) is cut, in which a resistance assembly (A) is mounted and is fastened between two micanite plates (2), the resistance subassembly (A) comprising a first micanite support (3) which has a resistance wire (4) wrapped around it and a second support (5) made of mecanite the ends of the wire (4) being insulated through the two micanite plates (2) in between which the subassembly (A) is displayed, the charging of the electric resistance being effected through two electric, flexible cables (8) with a double thermo resistant insulation (9), the connection of the ends of the resistance wire being done in such a way that its noninsulated ends are fastened between the two micanite insulated plates (2), the ceramic body (1) having its filled with a thermo-resistant adhesive (10).
  2. Electric resistance heating assembly according to claim 1, characterized in that the resistance wire (4) is a Kandal D wire (4).
EP20080163921 2007-09-10 2008-09-09 Electric resistance heating assembly Not-in-force EP2034797B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08163921T PL2034797T3 (en) 2007-09-10 2008-09-09 Electric resistance heating assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ROA200700637A RO123467B1 (en) 2007-09-10 2007-09-10 Heating resistor

Publications (3)

Publication Number Publication Date
EP2034797A2 true EP2034797A2 (en) 2009-03-11
EP2034797A3 EP2034797A3 (en) 2012-06-27
EP2034797B1 EP2034797B1 (en) 2015-05-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080163921 Not-in-force EP2034797B1 (en) 2007-09-10 2008-09-09 Electric resistance heating assembly

Country Status (6)

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EP (1) EP2034797B1 (en)
CN (1) CN101389162A (en)
ES (1) ES2549118T3 (en)
HU (1) HUE027049T2 (en)
PL (1) PL2034797T3 (en)
RO (1) RO123467B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2354725A1 (en) 2010-01-26 2011-08-10 Underleaf S.r.l. System for radiant heat transfer elements and heat accumulation obtained by means of recyclable inert material
CN104039030A (en) * 2014-06-04 2014-09-10 杨风印 Heating coil
CN111462963A (en) * 2020-04-24 2020-07-28 咸阳亚华电子电器有限公司 High-protection wire-wound high-power resistor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102446605B (en) * 2010-10-11 2013-09-11 上海克拉电子有限公司 Flat aluminum alloy shell resistor
DE202018101634U1 (en) * 2018-03-23 2018-04-03 Türk & Hillinger GmbH Device for converting electrical energy into heat and electrical heating device with such a device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RO81149A2 (en) 1982-04-02 1984-01-14 Institutul De Cercetare Stiintifica Si Inginerie Tehnologica Pentru Industria Electrotehnica,Ro ELECTRICAL HEATING RESISTANCE OF AVERAGE TEMPERATURE
RO85804A2 (en) 1983-11-04 1984-11-25 Institutul De Cercetare Stiintifica Si Inginerie Tehnologica Pentru Industria Electrotehnica,Ro ELECTRICAL RESISTANCE TO MEDIUM TEMPERATURE HEATING AND PROCESS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RO81149A2 (en) 1982-04-02 1984-01-14 Institutul De Cercetare Stiintifica Si Inginerie Tehnologica Pentru Industria Electrotehnica,Ro ELECTRICAL HEATING RESISTANCE OF AVERAGE TEMPERATURE
RO85804A2 (en) 1983-11-04 1984-11-25 Institutul De Cercetare Stiintifica Si Inginerie Tehnologica Pentru Industria Electrotehnica,Ro ELECTRICAL RESISTANCE TO MEDIUM TEMPERATURE HEATING AND PROCESS

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2354725A1 (en) 2010-01-26 2011-08-10 Underleaf S.r.l. System for radiant heat transfer elements and heat accumulation obtained by means of recyclable inert material
US8718455B2 (en) 2010-01-26 2014-05-06 Underleaf S.R.L. Radiant system for heat transfer
CN104039030A (en) * 2014-06-04 2014-09-10 杨风印 Heating coil
CN111462963A (en) * 2020-04-24 2020-07-28 咸阳亚华电子电器有限公司 High-protection wire-wound high-power resistor

Also Published As

Publication number Publication date
HUE027049T2 (en) 2016-08-29
PL2034797T3 (en) 2015-10-30
EP2034797A3 (en) 2012-06-27
CN101389162A (en) 2009-03-18
ES2549118T3 (en) 2015-10-23
RO123467B1 (en) 2012-07-30
EP2034797B1 (en) 2015-05-06

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