EP0859537A2 - Heizvorrichtung eines umgegossenen Heizelement - Google Patents

Heizvorrichtung eines umgegossenen Heizelement Download PDF

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Publication number
EP0859537A2
EP0859537A2 EP98400335A EP98400335A EP0859537A2 EP 0859537 A2 EP0859537 A2 EP 0859537A2 EP 98400335 A EP98400335 A EP 98400335A EP 98400335 A EP98400335 A EP 98400335A EP 0859537 A2 EP0859537 A2 EP 0859537A2
Authority
EP
European Patent Office
Prior art keywords
heating
heating device
wire
thermosetting
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.)
Granted
Application number
EP98400335A
Other languages
English (en)
French (fr)
Other versions
EP0859537A3 (de
EP0859537B1 (de
Inventor
Dominique Soulard
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.)
Atlantic - Francaise De Developpement Thermique Ste
Original Assignee
Atlantic - Francaise De Developpement Thermique Ste
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 Atlantic - Francaise De Developpement Thermique Ste filed Critical Atlantic - Francaise De Developpement Thermique Ste
Publication of EP0859537A2 publication Critical patent/EP0859537A2/de
Publication of EP0859537A3 publication Critical patent/EP0859537A3/de
Application granted granted Critical
Publication of EP0859537B1 publication Critical patent/EP0859537B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables

Definitions

  • the present invention relates to the field of heating by electric resistors, and more particularly a resistance heater electric comprising a heating body molded in a polymeric material.
  • the air is heated by convection, free or forced, in contact with metal surfaces.
  • These surfaces are generally made up of tubes called metallic heating bodies, most often in stainless steel or aluminum, containing an electrical resistance, arranged along the axis longitudinal of said tube.
  • the electrical resistance is a coiled metal wire, embedded in grains of magnesia compacted. Magnesia, thermal conductor and good insulator dielectric, thus safely ensures the transfer of resistance heat to the outside of the tube.
  • tubular heaters are of small diameter (of the order of ten millimeters); it is therefore necessary to increase the exchange surface between the air and the tube by adding diffusers to them, or fins, made of a material which is a good thermal conductor, by aluminum, for example.
  • the assembly must be arranged in a covering, or bodywork, on the one hand to prevent the user to be in direct contact with the body of heat up to temperatures of the order of 180 to 350 ° C, and secondly allow cold air from the lower part, not closed, to be reheated and rise towards the upper part, also open, direction of the room to be heated ("chimney" effect).
  • the disadvantage of these convectors is therefore to present a some bulk.
  • heating takes place thanks to the radiation of an electrical circuit placed at the surface of a tempered glass plate, an enameled plate or a schooped aluminum plate.
  • the printed circuit is generally in screen-printed silver paste. All must, as for convectors, be arranged in a protective covering, also having a certain size. This space cannot be reduced because it is defined by current standards imposing a space at least 4 millimeters or at least 8 millimeters, between respectively the tubular heating element or the plate glazed and metallic bodywork, for reasons of electrical and thermal safety.
  • Other resistance heating systems cables use cables for heating flexible heaters. They come in the form of flexible cords or ribbons containing resistance heater molded in a polymer material (PVC, PTFE, silicone rubber, polyurethane ). Such ribbons are described in document FR-B-2599115 and are used by example to the frost protection of pipes along of which they are arranged in a straight line or wound in a helix. Given the nature of their sheath in terms of thermoplastic, they have the property of being flexible, i.e. they cannot be used as heating element without support (pipes, frame, ). They are also mechanically very fragile, risk of being damaged by rubbing, crushing or cutting by tools. In addition, their properties are degrade when the temperature rises, mainly by softening their outer sheath.
  • the present invention therefore aims to remedy problems encountered with previous devices, that is to say in particular to reduce the size of the convection and / or radiation heating device, and provide a rigid and mechanically very device resistant, while ensuring significant safety for the user (electrical tightness, temperature rise moderate %)
  • the present invention provides a device electric resistance heating, comprising at least a heating body, characterized in that this body heater is molded in a thermosetting material which ensures the diffusion of heat from the heating body to outside the device.
  • a thermosetting material which ensures the diffusion of heat from the heating body to outside the device.
  • thermosetting material is obtained from a resin made of unsaturated polyester.
  • thermosetting materials are good dielectric insulators, so they are perfectly suited to the electrical "sealing" of the heating bodies that they coat.
  • thermosetting materials are good dielectric insulators, so they are perfectly suited to the electrical "sealing" of the heating bodies that they coat.
  • heat insulators use is made, in the present invention, of their poor thermal conductivity.
  • thermosetting polymer materials have good thermal emissivity properties, close to enamelled plates for example, where interesting properties for radiation.
  • thermosetting materials and in particular those based on unsaturated polyester resin, are very mechanically resistant.
  • their mechanical strength can be further improved, if the thermosetting material includes admixtures reinforcement, for example fibers, such as fibers glass, carbon fibers or organic fibers synthetic.
  • these fibers are preferably associated with unsaturated polyester resin, before or during of its polymerization.
  • Unsaturated polyester resins associated with glass fibers are preferred because they have a modulus of elasticity much higher than that of polyester alone, as well as greater resistance to traction.
  • thermosetting material can further include strength boosters with ultraviolet rays.
  • a conventional heater used in a first variant of the invention is a heating cable which has an electrically resistant wire wound around a electrically insulating support, for example made of glass, the wire / support assembly being surrounded by a sheath, preferably silicone rubber, or even fiber of glass.
  • the linear power of the heating cable can reach or exceed 100 Watts per meter.
  • thermosetting material is dielectrically insulating
  • the heating body is consisting only of electrically resistant wire (s), naked, directly embedded in the material thermosetting.
  • the heating body consists of a cable heating of the multi-strand type, overmolded with a sheath, by silicone example.
  • thermosetting material then serves both rigid support, electrical insulation, and coating protector of the electrical resistance, while ensuring the heat transfer to the outside of the device.
  • thermosetting polymer for example polymers high temperature resistant thermoplastics, such as polyamide 11, polyamide 66, yes P.E.T.
  • thermosetting does not coat the heating body (cable or wire) in its entirety, but leaves its ends free for electrical connections.
  • Thermal limiters of known type, can be added to the device of the invention. It could be "external" material temperature limiters thermosetting which cuts the electric current as soon as the predetermined maximum temperature is reached, i.e. internal limiters mounted in series with the (or the) electrical resistance (s), such as a bimetallic strip, is still self-regulating cables (i.e. cables whose ohmic characteristics are modified according to the temperature, with a maximum at 80 ° C for example).
  • the electric resistance heating device (1) comprises at least one heating body (2) which is a cable heating.
  • a central portion of such a cable (3) is shown schematically in Figure 1.
  • the core (4) (or core) of the heating cable (3) is consisting of a bundle of glass fibers forming a cylindrical support. On this support is wound a wire (5) electrically resistant, according to a predetermined pitch, the wire (5) + support (4) assembly is wrapped in a sheath (6) silicone.
  • the diameter of the heating cable (3) is close to 2 to 2.2 millimeters.
  • thermosetting material (7) As shown in figure 2.
  • the heating device (1) is molded in the form of a plate rectangular, 600 x 120 mm in size and thick 10 or 20 millimeters.
  • a single cable (3) is arranged in the middle of said plate (relative to thickness), i.e. equidistant from the forces anterior and posterior of the plate, and distributed uniformly, parallel to the length of the plate, going back and forth (here 3 in number) in occupying the maximum available space.
  • Load linear of the cable is 50 Watts per meter.
  • thermosetting material used in this example is a TMC type unsaturated polyester resin from at Crey-Valley (TOTAL).
  • TOTAL Crey-Valley
  • Continuous temperature reaches 70 ° C at surface of the device (1) in the case where the plate has a thickness of 10 mm.
  • the plate shown in Figure 2 can be used as a single heating device (1), or constitutes a module of a set of identical plates, to increase the heating surface.
  • the modules are stackable (if arranged horizontally), or juxtaposable (with a layout vertical), the different cables are then mounted in series, connected by their free ends (8, 9) complementary.
  • FIG 3 shows schematically an exemplary embodiment of the device of the invention where the heating bodies (2) are arranged in parallel.
  • These heating bodies (2) are either cables heaters such as that shown in Figure 1, or electrically resistant, bare, connected wires and electrically connected at their ends to bars vertical right (10a) and left (10b) metal (brass, bronze, or other), these bars (10a and 10b) have each of the female upper endings (11a and 11b) and male lower endings (12a, 12b), their allowing to nest by overlapping.
  • Each set heating element (2) / bars (10a, 10b) is fully molded in a thermosetting polymer without leaving appear that the endings (11a, 12a, 11b, 12b) for form a module (13).
  • the module (13) is nestable on a module identical (13 '), the electrical connections being established immediately and directly at the terminations metallic 12a, 12b, without the need for an electrical cord intermediate.
  • the shape of each module (13, 13 ') is cut horizontally, giving birth of interstices (14, 14 ') facilitating assembly of modules.
  • the device according to the invention can therefore be used as a radiant panel, as part of heating of a living room, an office.
  • the shape of the device is not limited to a plate as presented in the examples of FIGS. 2 and 3, but can be a disc, a bar, or any other desired shape.
  • the molding in thermoplastic material of heater can also in addition to the coating of the heating element (s), include or form the support element or the attachment element of the device heating, in one piece, which decreases notably the size, as well as the costs of manufacturing and installation.
  • the device according to the invention does not does not need to be incorporated into a bodywork or casing, if its surface temperature does not exceed 90 ° vs.
  • thermosetting material also gives a pleasant aesthetic appearance.
  • Another advantage is that it can be used without problem in very humid atmospheres (e.g. bathrooms), or even in contact with water.
  • the corrosion problems are ruled out with the device according to the invention.
  • This device can also be incorporated into walls, floors, tiles, as well as any wall to be heated or maintained to a certain temperature, such as baths, tanks ...
  • the high mechanical strength of the polymer thermosetting also allows to consider applications in a wide variety of areas, where the heater does not can be neither altered nor distorted.

Landscapes

  • Resistance Heating (AREA)
EP19980400335 1997-02-14 1998-02-13 Heizvorrichtung mit umgossenem Heizelement Expired - Lifetime EP0859537B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9701720A FR2759841B1 (fr) 1997-02-14 1997-02-14 Dispositif de chauffage a corps de chauffe surmoule
FR9701720 1997-02-14

Publications (3)

Publication Number Publication Date
EP0859537A2 true EP0859537A2 (de) 1998-08-19
EP0859537A3 EP0859537A3 (de) 1998-09-02
EP0859537B1 EP0859537B1 (de) 2002-07-24

Family

ID=9503703

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980400335 Expired - Lifetime EP0859537B1 (de) 1997-02-14 1998-02-13 Heizvorrichtung mit umgossenem Heizelement

Country Status (3)

Country Link
EP (1) EP0859537B1 (de)
ES (1) ES2180123T3 (de)
FR (1) FR2759841B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1045615A1 (de) * 1999-04-16 2000-10-18 Acome Société Cooperative De Travailleurs Elektrische Heizeinrichtung versehen mit selbst-regulierenden elektrischen Kabeln
FR2908262A1 (fr) * 2006-11-03 2008-05-09 Atlantic Ind Soc Par Actions S "radiateur seche-serviettes electrique en verre de type echelle"
FR2908261A1 (fr) * 2006-11-03 2008-05-09 Atlantic Ind Soc Par Actions S "panneau chauffant etanche et unidirectionnel pour radiateur electrique et radiateur electrique incluant un tel panneau"
US10293529B2 (en) * 2013-03-20 2019-05-21 Tetra Laval Holdings & Finance S.A. Sealing bar

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2839238B1 (fr) * 2002-04-26 2004-07-09 Atlantic Industrie Sas Dispositif de chauffage a corps de chauffe pris en sandwich entre deux plaques de materiaux differents
CN120719578A (zh) 2018-12-05 2025-09-30 恩文特服务有限责任公司 用于连接到基底的除冰盒

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058704A (en) * 1974-12-27 1977-11-15 Taeo Kim Coilable and severable heating element
FR2332674A1 (fr) * 1975-11-21 1977-06-17 Acim Jouanin Piece souple chauffante
KR900007569B1 (ko) * 1985-10-25 1990-10-15 마쯔시다덴기산교 가부시기가이샤 가요성 감열전선

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1045615A1 (de) * 1999-04-16 2000-10-18 Acome Société Cooperative De Travailleurs Elektrische Heizeinrichtung versehen mit selbst-regulierenden elektrischen Kabeln
FR2792491A1 (fr) * 1999-04-16 2000-10-20 Acome Soc Coop Travailleurs Dispositif de chauffage electrique a cables electriques autoregulants
FR2908262A1 (fr) * 2006-11-03 2008-05-09 Atlantic Ind Soc Par Actions S "radiateur seche-serviettes electrique en verre de type echelle"
FR2908261A1 (fr) * 2006-11-03 2008-05-09 Atlantic Ind Soc Par Actions S "panneau chauffant etanche et unidirectionnel pour radiateur electrique et radiateur electrique incluant un tel panneau"
US10293529B2 (en) * 2013-03-20 2019-05-21 Tetra Laval Holdings & Finance S.A. Sealing bar

Also Published As

Publication number Publication date
EP0859537A3 (de) 1998-09-02
ES2180123T3 (es) 2003-02-01
EP0859537B1 (de) 2002-07-24
FR2759841B1 (fr) 1999-04-30
FR2759841A1 (fr) 1998-08-21

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