EP0570246A1 - Améliorations à des panneaux chauffés par courant électrique - Google Patents

Améliorations à des panneaux chauffés par courant électrique Download PDF

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Publication number
EP0570246A1
EP0570246A1 EP93303760A EP93303760A EP0570246A1 EP 0570246 A1 EP0570246 A1 EP 0570246A1 EP 93303760 A EP93303760 A EP 93303760A EP 93303760 A EP93303760 A EP 93303760A EP 0570246 A1 EP0570246 A1 EP 0570246A1
Authority
EP
European Patent Office
Prior art keywords
heating
wire
fuse
wires
current
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Withdrawn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
EP93303760A
Other languages
German (de)
English (en)
Inventor
Leonard Charles Owers
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.)
THERMONETTE APPLIANCES Ltd
Original Assignee
THERMONETTE APPLIANCES Ltd
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 THERMONETTE APPLIANCES Ltd filed Critical THERMONETTE APPLIANCES Ltd
Publication of EP0570246A1 publication Critical patent/EP0570246A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H05B3/36—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heating conductor embedded in 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/004—Heaters using a particular layout for the resistive material or resistive elements using zigzag layout
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • This invention relates to electrically-powered heating panels, which may be of flexible or non-flexible construction.
  • electrically-powered heating panel is intended to include electrically-powered under-carpet heaters, blankets, mattresses and pads.
  • the invention is particularly applicable however, to electrically-powered under-carpet heaters.
  • a "dual wire heating cable” is defined as a cable containing two (inner and outer) resistance wires which are separated from each other by a first or inner insulation, the whole being enclosed in a second or outer insulation in the form of a sheath.
  • an electrically-powered heating panel comprises a dual wire heating cable (as herein above defined) with the two heating wires connected in series together with fuse means, the two wires being of substantially equal resistance, and the inner insulation comprising material, which, when overheated, allows electrical contact between the wires.
  • an electrically-powered heating panel 1 of flexible construction in the form of an under-carpet heater comprises, a dual wire heating cable 2, with inner (3) and outer (4) heating wires thereof connected in series together, with fuse means 5, the inner and outer heating wires 3, 4 being of substantially equal electrical resistance.
  • the inner and outer heating wires 3, 4, which are of coiled form, are electrically insulated from each other by inner insulation 6 of thermoplastics material.
  • the inner heating wire 3 is wound on a central core 7 of rayon and is covered by the insulation 6, which comprises a sheath of high density, low melting point (120°C) polyethylene.
  • the outer heating wire 4 is wound on the sheath of insulation 6 and is itself covered with an outer insulating sheath 8 of high temperature polyvinyl chloride (PVC), another thermoplastic material. (Melting point: 150°C.)
  • the dual wire heating cable 2 is connected, by way of a room temperature thermostat control (not shown) to a 240 AC power supply circuit represented by "line” L and "neutral” N .
  • the fuse means 5 is connected in series between the line L and the inner heating wire 3.
  • the wire 3 is connected in series with the wire 4, which is in turn connected in series with the neutral N .
  • this sheath will soften/melt and allow substantial electrical contact, (creating a short circuit), to occur between the inner and outer wires 3, 4 in the event of excessive overheating at any point along the length of the heating cable 2.
  • the increase in current flow may not be sufficient to blow the fuse 5 at once, as the fuse is rated at 3.0 amps, and the current flow is 4.1 amps.
  • the increased power input will cause the inner insulation sheath 6 to further overheat, (and soften/melt), so as to cause further short circuits between the heating wires 3 and 4, and increase current flow sufficiently to ensure that the fuse 5 does indeed blow. The current supply is therefore terminated.
  • the heating cable 2 which is also flexible, is tortuously wound over the area of the under-carpet heater 1.
  • the initial short circuit only halves the resistance wherever it occurs, thus ensuring no sudden current surge which could damage the heater control, i.e. the room thermostat, or cause the fuse 5 or any part of the circuit to explode. This could happen in a circuit subjected to a complete or very low resistance short circuit.
  • Modifications of the cable 2 may include dispensing with the core 7 and providing one (or more) (uncoiled) wire 3 which extends through and is enclosed by tight-fitting sheath 6 material. If more than one wire 3 is so provided, the other or others are separated therefrom by sheath 6 material.

Landscapes

  • Central Heating Systems (AREA)
EP93303760A 1992-05-14 1993-05-14 Améliorations à des panneaux chauffés par courant électrique Withdrawn EP0570246A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9210340 1992-05-14
GB9210340A GB2267189A (en) 1992-05-14 1992-05-14 Improvements in or relating to electrically-powered heating panels.

Publications (1)

Publication Number Publication Date
EP0570246A1 true EP0570246A1 (fr) 1993-11-18

Family

ID=10715486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93303760A Withdrawn EP0570246A1 (fr) 1992-05-14 1993-05-14 Améliorations à des panneaux chauffés par courant électrique

Country Status (3)

Country Link
EP (1) EP0570246A1 (fr)
GB (1) GB2267189A (fr)
ZA (1) ZA933331B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10317452B3 (de) * 2003-01-23 2004-11-04 Beurer Gmbh & Co Schmiegsames Wärmegerät
CN1878434B (zh) * 2005-03-12 2010-12-08 朴凤达 无电磁波辐射、无感应电的电热毯发热装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ332263A (en) * 1997-10-17 2000-01-28 Imetec Spa Electric blanket or pad with co-axial heating coils separated by insulation that melts if blanket overheats

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628093A (en) * 1970-04-13 1971-12-14 Northern Electric Co Thermostat overheat protection system for an electric appliance such as a blanket
GB2028608A (en) * 1978-08-24 1980-03-05 Dreamland Electrical Appliance Heating circuits
GB1588784A (en) * 1978-01-31 1981-04-29 Dreamland Electrical Appliance Heating circuits
GB1602734A (en) * 1974-01-14 1981-11-18 Thermonette Appliances Ltd Electrically-powered heating panels
GB2086676A (en) * 1980-11-03 1982-05-12 Sunbeam Corp Protective circuit for electric bedcover or the like
AU537659B2 (en) * 1979-11-08 1984-07-05 Peter Pan Electrics Pty. Ltd. Electric blanket
FR2590433A1 (fr) * 1985-11-20 1987-05-22 Degois Cie Ets Element chauffant de securite destine a etre utilise, notamment dans une couverture chauffante

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1258106A (fr) * 1969-04-10 1971-12-22
GB1585921A (en) * 1977-11-11 1981-03-11 Dreamland Electrical Appliance Protective circuits for electrically heated blankets or pads

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628093A (en) * 1970-04-13 1971-12-14 Northern Electric Co Thermostat overheat protection system for an electric appliance such as a blanket
GB1602734A (en) * 1974-01-14 1981-11-18 Thermonette Appliances Ltd Electrically-powered heating panels
GB1588784A (en) * 1978-01-31 1981-04-29 Dreamland Electrical Appliance Heating circuits
GB2028608A (en) * 1978-08-24 1980-03-05 Dreamland Electrical Appliance Heating circuits
AU537659B2 (en) * 1979-11-08 1984-07-05 Peter Pan Electrics Pty. Ltd. Electric blanket
GB2086676A (en) * 1980-11-03 1982-05-12 Sunbeam Corp Protective circuit for electric bedcover or the like
FR2590433A1 (fr) * 1985-11-20 1987-05-22 Degois Cie Ets Element chauffant de securite destine a etre utilise, notamment dans une couverture chauffante

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10317452B3 (de) * 2003-01-23 2004-11-04 Beurer Gmbh & Co Schmiegsames Wärmegerät
CN1878434B (zh) * 2005-03-12 2010-12-08 朴凤达 无电磁波辐射、无感应电的电热毯发热装置

Also Published As

Publication number Publication date
GB9210340D0 (en) 1992-07-01
ZA933331B (en) 1993-11-18
GB2267189A (en) 1993-11-24

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Effective date: 19940519