EP2503844B1 - Dispositif de chauffage électrique - Google Patents

Dispositif de chauffage électrique Download PDF

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Publication number
EP2503844B1
EP2503844B1 EP12160471.4A EP12160471A EP2503844B1 EP 2503844 B1 EP2503844 B1 EP 2503844B1 EP 12160471 A EP12160471 A EP 12160471A EP 2503844 B1 EP2503844 B1 EP 2503844B1
Authority
EP
European Patent Office
Prior art keywords
contact
heating element
heating device
metal housing
housing
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.)
Active
Application number
EP12160471.4A
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German (de)
English (en)
Other versions
EP2503844A1 (fr
Inventor
Roland Starck
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.)
Eichenauer Heizelemente GmbH and Co KG
Original Assignee
Eichenauer Heizelemente GmbH and Co KG
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.)
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Application filed by Eichenauer Heizelemente GmbH and Co KG filed Critical Eichenauer Heizelemente GmbH and Co KG
Publication of EP2503844A1 publication Critical patent/EP2503844A1/fr
Application granted granted Critical
Publication of EP2503844B1 publication Critical patent/EP2503844B1/fr
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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
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • 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
    • H05B2203/016—Heaters using particular connecting means
    • 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
    • H05B2203/021—Heaters specially adapted for heating liquids
    • 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
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • the invention relates to an electric heater with the features specified in the preamble of claim 1.
  • a heating device with the features specified in the preamble of claim 1 is known from DE 10 2007 006 058 A1 known.
  • the heating element In heaters for heating aggressive liquids or combustible gas mixtures, the heating element must be protected from contact with the fluid to be heated. To achieve this, it is known to pour out the interior of a heating housing with plastic or to overmold the housing with plastic. Both measures are complicated and cause a disadvantageous thermal insulation, so that heat generated by a heating element can be given off worse to the fluid to be heated.
  • Object of the present invention is to show a way, as in an electric heater reliable protection of the heating element before contact can be combined with the fluid to be heated with a good heat output.
  • the contact plate of a heating device carries an electrically insulating jacket made of a sealing material, for example of elastomeric plastic.
  • the jacket has a recess in which the heating element lies, and forms an annular sealing element, preferably an annular bead, which surrounds the heating element.
  • the sealing element can be pressed in the axial direction, ie in the direction perpendicular to the contact surface of the heating element. For example, the sealing element may be pressed between the contact plate and a ground contact of the heating element.
  • the heating element of a heating device according to the invention is reliably protected from contact with the fluid to be heated by the sealing element formed by the jacket.
  • the top and the bottom of the heating element are covered by the contact surface of the contact sheet or the ground contact, which may be formed for example by the housing, while the sealing element around the heating element around a gap between the contact plate and another contact, preferably one Ground contact, fills and seals.
  • Due to the jacket made of a sealing material, preferably an elastomer, the contact sheet lying at electrical potential during operation is also advantageously protected from contact with the fluid to be heated.
  • the heating device can therefore be used without problems for heating combustible fluids, since all the components of the heating device which are in operation at electrical potential are electrically insulated from the fluid to be heated by the jacket and consequently there is no risk of sparking.
  • the heating element is preferably a PTC heating element, in particular a ceramic heating element, for example based on barium titanate.
  • a second contact sheet may be used, which also carries a jacket of a sealing material, preferably of elastomer, which forms a recess for a contact surface with the preferred ceramic heating element Has.
  • the jacket of the contact sheet is preferably made of a thermoplastic elastomer.
  • elastomer alloys for example mixtures of polypropylene and ethylene-propylene-diene rubber.
  • block copolymers can also be used.
  • the metal housing of a heating device may have a bottom, which is formed integrally with a side wall, or closes an opening of a housing part, which forms the side wall.
  • the heating element is preferably with a contact surface, that is, one of the two sides, where it is electrically contacted, facing the ground, for example, it may rest against the ground.
  • the side wall may be curved, for example, the heating element may be arranged in a cylindrical interior. From the side wall heat release ribs can emanate.
  • the heating element is surrounded by heat-emitting ribs, in particular the heat-emitting ribs can be distributed around the heating element.
  • the contact plate is bent, for example bent, so that a protruding from the metal housing first portion of the contact plate faces with its upper side of a side wall of the metal housing, while a second portion, with the contact surface on the heating element is applied, facing a bottom or lid of the metal housing.
  • a protruding from the metal housing first portion of the contact plate faces with its upper side of a side wall of the metal housing, while a second portion, with the contact surface on the heating element is applied, facing a bottom or lid of the metal housing.
  • the narrow sides of the heating element, which connect the top and the bottom of the heating element together, are then facing a side wall of the metal housing.
  • a further advantageous embodiment of the invention provides that the contact plate is located in the interior of the metal housing between a silicone disk and the heating element.
  • the silicone disk is preferably made of a silicone elastomer, in particular a fully crosslinked silicone elastomer.
  • the silicone elastomer has a thermal conductivity of at least 3.5 W / (m ⁇ K), more preferably 6W / (m ⁇ K) or more.
  • Particularly advantageous is a rising under pressure heat conductivity.
  • the silicone disk can advantageously compensate for unevenness of the heating element upper side and the lid.
  • the silicone elastomer is reinforced with fibers, such as glass fibers, to better withstand the pressure exerted on the disc.
  • the fibers can form a fabric, in particular a glass fiber fabric.
  • the jacket of the contact sheet has a further recess in which the silicone disk is located.
  • the heat dissipation can be improved by the silicone disk.
  • the silicone disk causes an electrical insulation of the contact plate in the region of the recess.
  • the contact plate By combining an elastic sheath with a silicone disc, different sections of the electrical insulation of the contact plate can be optimized with respect to their respective function.
  • the cladding of the contact sheet should be easy to deform in order to fulfill its sealing function well, while the silicone disc should compensate for unevenness and good heat conduction must have properties.
  • the jacket should be well injection-molded, which is not significant for the silicone disc.
  • a heating element in particular a ceramic heating element
  • the jacket then has a recess on two sides of the contact plate, in each of which a heating element is seated and is electrically contacted by the contact plate.
  • the jacket may in such a case around both heating elements form an annular sealing element, such as a torus, and protect the side surfaces of the heating element from contact with the fluid to be heated.
  • a further advantageous embodiment of the invention provides that the lid is made of metal and is pressed into the housing.
  • the housing can be advantageously closed and produce a high contact pressure, which leads to a good heat-conducting contact between the arranged in the interior of the heater components, in particular the heating element and the contact plate. Furthermore, one obtains so advantageous a compact and easy to handle heater.
  • the lid is cup-shaped.
  • This measure has the advantage of good heat coupling of the lid to the housing.
  • a cup-shaped lid has a lid surface from which a side surface extends circumferentially. The side surface abuts the housing and thus ensures good thermal contact.
  • the lid can be pressed into a casting that forms both a bottom and a circumferential side wall of the interior. It is also possible to press the lid in an extrusion, which is closed at the other end by another part, which then forms the bottom of the interior. Preferably, this part is also pot-shaped and pressed into the extruded part.
  • a further advantageous development of the invention provides that the interior, in which the heating element is arranged, has a circularly curved side wall.
  • the metal housing can in this way have a cylindrical shape in which a lid can be particularly well pressed.
  • the in the FIGS. 1 to 4 shown heating device has a metal housing 1, which is closed by a metal lid 2.
  • a PTC heating element 3 is arranged, which may be formed for example as a disc, in particular a circular disk.
  • the PTC heating element 3 has two contact surfaces, at which it is electrically contacted. One of these two contact surfaces is arranged on a cover 2 facing side of the PTC heating element. This page is therefore referred to as a contact page.
  • the other contact side faces a bottom of the housing, which may be formed as a separate part which is inserted into a housing main part, for example an extruded part.
  • the bottom can also be integrally formed with a housing main part, for example by the metal housing is a cup-shaped casting.
  • the two contact sides of a plate or disk-shaped PTC heating element are often referred to as upper and lower sides.
  • the metal housing 1 thus has an opening which is closed by the metal lid 2.
  • a surface normal of a contact surface of the PTC heating element extends through the opening and thus through the cover.
  • the PTC heating element 3 is contacted by a contact plate 4, which protrudes from the metal housing.
  • the contact plate 4 is encapsulated with an elastomer.
  • the elastomer forms a jacket 5 which electrically insulates the contact plate 4 from the metal housing.
  • the jacket 5 has a recess for a contact surface against which the PTC heating element 3 rests.
  • the elastomeric jacket 5 forms an annular bead 5a, which surrounds the PTC heating element 3 and is pressed between the contact plate 4 and a ground contact of the PTC heating element 3.
  • the ground contact of the PTC heating element 3 is the metal housing 1. Particularly suitable as ground contact is in particular the housing bottom. As ground contact but can Also, the metal lid 2 or a second contact plate can be used, which rests against the PTC heating element 3.
  • the annular bead 5 a before pressing a measured perpendicular to the contact surface of the contact plate 4 height, which is greater than the thickness of the PTC heating element 3, so that the annular bead 5 a covering the PTC heating element 3 on its entire side surface and thus protects against contact with a fluid to be heated.
  • the annular bead 5a can also have a slightly lower height by the PTC heating element 3 in a recessed receptacle, for example, a recess in the housing base, sitting.
  • the annular bead 5a can sit on the contact plate 4, as is the case in the illustrated embodiment, or run next to the contact plate.
  • the contact plate 4 protrudes with a strip-shaped first portion out of the metal housing, while a second portion rests with the contact surface on the PTC heating element. Between the first and the second section, the contact plate 4 is bent.
  • the second section is therefore arranged transversely, preferably perpendicular, to the first section.
  • the second section is preferably wider than the first section.
  • the second section may for example be formed as a circular disk, as shown schematically in the figures.
  • the contact plate 4 has an upper side facing the bottom or lid of the metal housing in the first portion of the side wall and in the second portion.
  • Under the top of a sheet is to be understood as one of the two large-scale sides of the sheet, each make up approximately half of the entire surface of the sheet and are connected at their edges on narrow sides.
  • the jacket 5 of the contact plate 4 has on the side facing away from the PTC heating element 3 side a further recess in which a silicone plate 6 is arranged.
  • the silicone disk 6 may be surrounded by an annular bead 5 b, which is formed by the jacket 5.
  • the annular bead 5b may cover the side surface of the silicone disc at full height or have a lower height.
  • the preferred in the main part 1 Pressed lid 2 rests on the silicone disk 6 and causes the contact plate 4 is pressed against the PTC heating element 3. In this way, a full-surface connection between the PTC heating element and the contact plate is ensured, so that a good electrical contact and a good thermal contact between the PTC heating element 3 and the contact plate 4 is made
  • the strip-shaped first portion of the contact plate 4 is arranged in a groove in the circumferential side wall of the metal housing.
  • the jacket 5 of elastomeric material encloses the first portion of the contact plate 4, which lies in the groove.
  • the heating device may have a second contact plate 7, as shown by way of example in the figures.
  • the second contact plate 7 When the housing is used as a ground contact, the second contact plate 7 is not electrically isolated from the housing.
  • the second contact plate 7 may be arranged in a further groove in a side wall of the housing. However, the second contact plate 7 does not have to be connected to the interior of the metal housing in connection, but may be attached to any position on the metal housing. If the second contact plate 7 is to be electrically insulated with respect to the housing, it may, like the first contact plate 4, be formed and encapsulated with an elastomeric jacket.
  • the lid may be cup-shaped, ie have a circumferential side wall, which extends from a cover surface.
  • the side wall can then advantageously abut against the metal housing and thus ensure good thermal contact.
  • the lid has a slight excess over the interior of the metal housing before pressing.
  • the lid edge hooked in the side wall of the interior.
  • the lid with the side wall but also caulked or locked.
  • the metal housing may have heat release ribs as shown in the figures.
  • the heat release ribs may in particular be part of the main part 1 and extend radially outwardly from its circumferential side wall.
  • the interior of the metal housing may for example be cylindrically shaped, as shown in the figures.
  • the side wall formed by the main part 1 is then curved in a circular shape.

Landscapes

  • Resistance Heating (AREA)

Claims (10)

  1. Dispositif de chauffage électrique avec
    un boîtier métallique (1) qui est fermé par un couvercle (2),
    au moins un élément de chauffage (3) qui est disposé dans un espace intérieur du boîtier métallique (1) et présente au moins deux surfaces de contact sur lesquelles il est en contact électriquement, où l'une des surfaces de contact est orientée vers le couvercle (2), et
    une plaque de contact (4), laquelle est en contact électriquement avec l'une des surfaces de contact, caractérisé en ce que
    la plaque de contact (4) porte une enveloppe (5) constituée d'un matériau d'étanchéité, où l'enveloppe (5) présente une cavité, dans laquelle l'élément de chauffage (3) touche à la plaque de contact (4), et où l'enveloppe (5) forme un élément d'étanchéité (5a) en forme d'anneau qui entoure la cavité et l'élément de chauffage (3).
  2. Dispositif de chauffage selon la revendication 1, caractérisé en ce que la plaque de contact (4) est recourbée entre une première section, qui émerge du boîtier métallique (1), et une deuxième section, qui touche avec la surface de contact à l'élément de chauffage (3), où la plaque de contact (4) présente une face supérieure qui est orientée vers une paroi latérale dans la première section et vers un fond ou le couvercle (2) du boîtier métallique (1) dans la deuxième section
  3. Dispositif de chauffage selon la revendication 2, caractérisé en ce que la paroi latérale du boîtier métallique (1) présente une rainure dans laquelle se situe la première section de la plaque de contact (4).
  4. Dispositif de chauffage selon la revendication 3, caractérisé en ce qu'une deuxième plaque de contact (7) est disposée dans une deuxième rainure de paroi latérale.
  5. Dispositif de chauffage selon l'une des revendications précédentes, caractérisé en ce que la plaque de contact (4) se situe dans l'espace intérieur du boîtier métallique entre un disque en silicone (6) et l'élément de chauffage (3).
  6. Dispositif de chauffage selon la revendication 5, caractérisé en ce que l'enveloppe (5) de la plaque de contact (4) présente une autre cavité dans laquelle se situe le disque en silicone (6).
  7. Dispositif de chauffage selon l'une des revendications précédentes, caractérisé en ce que le couvercle (2) est enfoncé par pression à l'intérieur dans le boîtier (1).
  8. Dispositif de chauffage selon l'une des revendications précédentes, caractérisé en ce que l'élément de chauffage (3) est disposé entre un fond de boîtier et la plaque de contact (4).
  9. Dispositif de chauffage selon l'une des revendications précédentes, caractérisé en ce que le couvercle (2) a la forme d'un pot.
  10. Dispositif de chauffage selon l'une des revendications précédentes, caractérisé en ce que le boîtier métallique (1) entoure l'espace intérieur avec une paroi latérale recourbée.
EP12160471.4A 2011-03-21 2012-03-21 Dispositif de chauffage électrique Active EP2503844B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011014626A DE102011014626A1 (de) 2011-03-21 2011-03-21 Elektrische Heizeinrichtung

Publications (2)

Publication Number Publication Date
EP2503844A1 EP2503844A1 (fr) 2012-09-26
EP2503844B1 true EP2503844B1 (fr) 2016-11-30

Family

ID=45936854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12160471.4A Active EP2503844B1 (fr) 2011-03-21 2012-03-21 Dispositif de chauffage électrique

Country Status (2)

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EP (1) EP2503844B1 (fr)
DE (1) DE102011014626A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016224296A1 (de) * 2016-12-06 2018-06-07 Eberspächer Catem Gmbh & Co. Kg Elektrische heizvorrichtung
IT201800007346A1 (it) * 2018-07-19 2020-01-19 Riscaldatore elettrico per serbatoio

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4874924A (en) * 1987-04-21 1989-10-17 Tdk Corporation PTC heating device
DE202005012393U1 (de) * 2005-08-06 2005-11-10 Microhellix Systems Gmbh Elektrisches Heizmodul zur Luftstromerwärmung, insbesondere in Fahrzeugen
US20080173637A1 (en) * 2005-11-02 2008-07-24 Koshiro Taguchi Insulated waterproof heater
DE102007006058B4 (de) * 2007-02-02 2009-11-26 Microhellix Systems Gmbh Elektrisches Heizmodul zur Luftstromerwärmung, insbesondere zur Heizung und Belüftung von Sitzen
CN201407638Y (zh) * 2009-05-20 2010-02-17 卢生成 加湿器的蒸汽发生装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2503844A1 (fr) 2012-09-26
DE102011014626A1 (de) 2012-09-27

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