EP1298961A2 - Flexiblen Graphitfilzsheizelementen und Verfahren zur Infrarot bestrahlung - Google Patents

Flexiblen Graphitfilzsheizelementen und Verfahren zur Infrarot bestrahlung Download PDF

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Publication number
EP1298961A2
EP1298961A2 EP02253209A EP02253209A EP1298961A2 EP 1298961 A2 EP1298961 A2 EP 1298961A2 EP 02253209 A EP02253209 A EP 02253209A EP 02253209 A EP02253209 A EP 02253209A EP 1298961 A2 EP1298961 A2 EP 1298961A2
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EP
European Patent Office
Prior art keywords
flexible graphite
graphite felt
heating element
glass housing
glass
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.)
Withdrawn
Application number
EP02253209A
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English (en)
French (fr)
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EP1298961A3 (de
Inventor
Bai Wei Wu
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.)
Individual
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Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1298961A2 publication Critical patent/EP1298961A2/de
Publication of EP1298961A3 publication Critical patent/EP1298961A3/de
Withdrawn legal-status Critical Current

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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • 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—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/145—Carbon only, e.g. carbon black, graphite

Definitions

  • the present invention relates to a flexible graphite felt heating element and a process for radiating infrared.
  • heating elements have been developed for heating various electrical appliances.
  • traditional heating elements use metal housing, quartz glass material. Its current carrying conductor uses metallized heating wires as an electric heat power supply through convection and conduction for inefficiency is experienced.
  • a carbon group material has been utilized to effect the rate of heat radiation.
  • Japan patent application 02-133922 discloses a heating element with a conductive film formed on the surface of the base substance made of a carbon group material.
  • Japan patent application 11-100133 discloses a substrate heating device including a heater made of graphite materials for heating a substrate for forming a thin film and the heater having a shape equivalent to the diameter of a substrate to be heated.
  • One embodiment of the present invention is a flexible graphite felt heating element comprising:
  • Another embodiment of the present invention is a process for radiating infrared comprising the steps of:
  • the present invention achieves low thermal conductivity, has a substantially uniform structure and allows for rapid heating efficiency. Energy savings of up to about 75% are realized over conventional heater elements and radiating infrared methods.
  • Fig. 1 is flexible graphite felt heating element of the present invention.
  • the flexible graphite felt heating elements may be produced in various shapes, sizes and dimensions.
  • One preferred shape is a strip, elongated or linear piece. It has a substantially uniform structure, that is, smooth, flat over long lengths, preferably 25 meters and substantially uniform thickness resulting in constant insulating properties.
  • the flexible graphite felt heating elements may be assembled in various electrical appliances including but not limited to an electric heater, warmers, air conditioners, ovens and the like. Furthermore, electrostatic charging is minimized when the present invention is used together with plastics in composite materials.
  • the intensity of radiant infrared has a wavelength of 4 to 100 microns, preferably 6 to 14 microns and exhibits antibacterial, antifungus and beneficial health results.
  • the flexible graphite felt heating element having an elongated shaped is placed inside a glass made housing 1.
  • the flexible graphite felt 2 can be a fibred material or the like.
  • the housing can be glass, quartz glass, ceramic and the like.
  • each end of the flexible graphite felt is connected to an electrode 3.
  • the electrode could be assembled using a metal material selected from the group consisting of molybdenum, tungsten or the like in the form of a molybdenum sheet or molybdenum wire 4. It will be appreciated the material of the electrode could be assembled using other comparable metal materials.
  • a ceramic ring is inserted at the end of the glass tube through which the electrode is lead out by another piece of metal wire.
  • the evacuation of the housing is done by the vacuum and heating as described in "Technology of Vacuum", China United Book No. 15290.388, page 51 (1986), the teachings of which are incorporated by reference.
  • Inactive gas 5 or another material resistance to oxidation is optional and may be filled into the glass tube which is then sealed.
  • the inactive gas can be argon, helium or the like.
  • the housing is then sintered at a temperature of about 1300 to 1600' C and sealed, as described in "Handbook of Vacuum Designs", 2nd edition, page 1177 (1996), the teachings of which are incorporated herein by reference.
  • Fig. 1 is one embodiment of a flexible graphite felt heating element of the present invention.
  • the flexible graphite felt 2 is housed within a quartz glass tube 1.
  • the electrode 3 is at the each end of the elongated flexible graphite felt and the electrode 3 is connected to a wire 4.
  • the inactive gas 5 is filled into the glass tube 1 which is sealed.
  • Another embodiment of the present invention is a process for radiating infrared comprising the steps of placing manually a flexible graphite felt inside a glass housing. Next a technique as described above to evacuate the housing such as by vacuuming, heating or the like is followed by connecting electrodes by molybdenum wire to each end of the flexible graphite felt as described in "Technology of Vacuum" page 151, the teachings of which are incorporated herein by reference. This step is followed by sealing the glass housing by way of sintering at a temperature of 1300 to 1600° C and radiating infrared rays having a wavelength in the range of about 4 to 100 microns, preferably 6 to 14 microns.
  • the flexible graphite felt is generally commercially available and may be manufactured by graphitization of carbon felt. This process makes for smaller specific surface areas and greatly reduced pump-down times under high vacuum.
  • a very low ash content of about 0.01 to about 0.06 %, preferably about 0.03 to about 0.05%, based on the total weight of the 400 gram to 1100 gram per square meter is indispensable for high purity materials in production plants and ensures high oxidation resistance of graphite felts.
  • Experimental testing exemplifies that the graphite felt heating element has a long life and can be consumed in excess of 30,000 hours.
EP02253209A 2001-09-27 2002-05-08 Flexiblen Graphitfilzsheizelementen und Verfahren zur Infrarot bestrahlung Withdrawn EP1298961A3 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN01255970U CN2502480Y (zh) 2001-09-27 2001-09-27 炭素纤维电热器件
CN01255970 2001-09-27
CN01349095 2001-11-08

Publications (2)

Publication Number Publication Date
EP1298961A2 true EP1298961A2 (de) 2003-04-02
EP1298961A3 EP1298961A3 (de) 2006-06-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02253209A Withdrawn EP1298961A3 (de) 2001-09-27 2002-05-08 Flexiblen Graphitfilzsheizelementen und Verfahren zur Infrarot bestrahlung

Country Status (2)

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EP (1) EP1298961A3 (de)
CN (1) CN2502480Y (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006037596A1 (de) * 2004-10-05 2006-04-13 Margarete Kerschbaum Heizgerät
DE102007050289A1 (de) 2007-10-18 2009-04-23 Heraeus Noblelight Gmbh Carbonstrahler mit Getter
US10841980B2 (en) 2015-10-19 2020-11-17 Laminaheat Holding Ltd. Laminar heating elements with customized or non-uniform resistance and/or irregular shapes and processes for manufacture
US10925119B2 (en) 2015-01-12 2021-02-16 Laminaheat Holding Ltd. Fabric heating element
USD911038S1 (en) 2019-10-11 2021-02-23 Laminaheat Holding Ltd. Heating element sheet having perforations

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106993344A (zh) * 2017-05-20 2017-07-28 丰艳 平面薄板型远红外辐射加热板及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107152A (en) * 1960-09-12 1963-10-15 Union Carbide Corp Fibrous graphite
US6057532A (en) * 1993-05-21 2000-05-02 Ea Tech Ltd Infra-red radiation sources

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107152A (en) * 1960-09-12 1963-10-15 Union Carbide Corp Fibrous graphite
US6057532A (en) * 1993-05-21 2000-05-02 Ea Tech Ltd Infra-red radiation sources

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006037596A1 (de) * 2004-10-05 2006-04-13 Margarete Kerschbaum Heizgerät
DE102007050289A1 (de) 2007-10-18 2009-04-23 Heraeus Noblelight Gmbh Carbonstrahler mit Getter
US10925119B2 (en) 2015-01-12 2021-02-16 Laminaheat Holding Ltd. Fabric heating element
US10841980B2 (en) 2015-10-19 2020-11-17 Laminaheat Holding Ltd. Laminar heating elements with customized or non-uniform resistance and/or irregular shapes and processes for manufacture
USD911038S1 (en) 2019-10-11 2021-02-23 Laminaheat Holding Ltd. Heating element sheet having perforations

Also Published As

Publication number Publication date
EP1298961A3 (de) 2006-06-28
CN2502480Y (zh) 2002-07-24

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