EP3424266B1 - Cartouche de chauffage avec un tube de protection - Google Patents

Cartouche de chauffage avec un tube de protection Download PDF

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Publication number
EP3424266B1
EP3424266B1 EP17709928.0A EP17709928A EP3424266B1 EP 3424266 B1 EP3424266 B1 EP 3424266B1 EP 17709928 A EP17709928 A EP 17709928A EP 3424266 B1 EP3424266 B1 EP 3424266B1
Authority
EP
European Patent Office
Prior art keywords
protective tube
heating cartridge
spring element
tube
heating
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
EP17709928.0A
Other languages
German (de)
English (en)
Other versions
EP3424266A1 (fr
Inventor
Patrick Le Coent
Ulrich Schlachter
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.)
Filing date
Publication date
Application filed by Eichenauer Heizelemente GmbH and Co KG filed Critical Eichenauer Heizelemente GmbH and Co KG
Publication of EP3424266A1 publication Critical patent/EP3424266A1/fr
Application granted granted Critical
Publication of EP3424266B1 publication Critical patent/EP3424266B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins
    • 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
    • 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
    • H05B3/82—Fixedly-mounted immersion heaters
    • 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
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient

Definitions

  • the application relates to a heating cartridge which is arranged in an outer protective tube.
  • Such heating cartridges are required in particular for exhaust gas cleaning systems (SCR systems), for example for heating tanks that contain urea solution or cartridges that contain an ammonia-containing solid or an enzyme, with the help of which ammonia or a urea solution with a desired urea concentration is generated.
  • SCR systems exhaust gas cleaning systems
  • Electric heating cartridges which contain a heating wire or a PTC element as a heating element.
  • the electrical heating elements are introduced into a metallic cladding tube, the cladding tube being tightly closed at one end, preferably by a metallic base, and the connections being led out of the tube at the other end.
  • the connection end can also be sealed, for example by a plastic compound.
  • the cladding tube can for example be an extruded profile in which ceramic PTC elements are arranged, or a metal tube in which, for example, a heating coil embedded in insulating material is arranged. It is also possible that a thin-walled metal tube surrounds one or more extruded profiles as an additional cladding tube.
  • the heat transfer could probably be improved if a material that conducts heat well, such as magnesium oxide, were filled into the air gap. Then, however, the heating cartridge and the protective tube can no longer be taken apart again without problems, which is often desired for replacement purposes.
  • a material that conducts heat well such as magnesium oxide
  • the heating cartridge and the protective tube can no longer be taken apart again without problems, which is often desired for replacement purposes.
  • the cartridge should be able to be exchanged, but the heating cartridge remains in the vehicle.
  • Such solid storage media can contain ammonia salts, for example.
  • a heating cartridge which has a jacket tube into which an inner tube is inserted, in which plate-shaped PTC elements are arranged between spring steel sheets.
  • the spring plates each have a semicircular curved section that presses against the inside of the inner tube and a flat section that rests against the PTC elements.
  • a tubular heating element in which thermal contact between rod-shaped heating elements and a tube surrounding the heating elements is achieved by lamellar spacers which rest against the tube with arcuately curved sections.
  • an electrical heating device with PTC elements is known, which are arranged in a channel of an extruded profile.
  • the extruded profile has resiliently movable heat dissipation surfaces which protrude from the channel.
  • a helical heating cartridge for heating nozzles of an injection molding device is known.
  • the helical heating cartridge is inserted into a cylindrical casing part, onto which a second casing part is pushed.
  • the first casing part is thereby compressed by the second casing part, so that the helical heating cartridge is also compressed and pressed against an object enclosed by it which is to be heated.
  • the object of the invention is therefore to improve the transfer of heat from the heating cartridge to the inside of the protective tube, the outside of which is in thermally conductive contact with the medium to be heated.
  • the heat is transferred from the heating cartridge, for example directly from an extruded profile or from a jacket tube surrounding at least one extruded profile, to the protective tube via the at least one spring element.
  • the fact that pressure surfaces of the spring element are pressed against the inside of the protective tube with a prestressing force results in particularly effective heat transfer.
  • the at least one spring element can, in an advantageous development, be attached to the heating cartridge in a material and / or form-fitting manner, for example to the cladding tube or protective tube.
  • one or more heating elements can be arranged in an extruded profile, which can then be viewed as a cladding tube. It is also possible, however, for at least one extruded profile, which can be made of aluminum, for example, to be surrounded by a comparatively thin-walled cladding tube, for example made of stainless steel, and thus additionally protected. It is also possible for one or more heating resistors, for example a heating coil, to be arranged embedded in an insulator, for example ceramic powder, in a thin-walled cladding tube.
  • the spring element preferably also has pressure surfaces which are pressed against the outside of the cladding tube with a pretensioning force. This also ensures good heat transfer from the cladding tube to the spring element.
  • the spring element can have at least one pressure surface on the cladding tube which, in the installed state, is resiliently pressed against the outside of the cladding tube by the pretensioning force of the spring element. A narrow, strip-shaped contact surface is sufficient for good heat transfer due to the contact pressure.
  • the spring element is designed in a meandering shape, with connecting sections each having the pressure surfaces on both sides Connect to the protective tube and the cladding tube
  • the spring element is preferably designed in a meandering cross section.
  • connection sections on both sides of a pressure surface increases from the center of the connection sections to the pressure surface connecting them. This results in total contact surfaces on the cladding tube and / or protective tube that are larger than the outer or inner half of the outer or inner surface of the cladding or protective tube, which causes particularly good heat coupling from the tubes to the spring element.
  • the at least one spring element is attached to the cladding tube.
  • the spring element is preferably attached to the cladding tube only at one end, so that its other end can be moved in the longitudinal direction relative to the heating cartridge. Alternatively, it can be attached along at least one axial line. However, it is also possible that the spring element is only held in a clamping manner, that is to say can move freely relative to the protective tube and the heating cartridge or a cladding tube, for example to compensate for thermally induced changes in length.
  • the spring element is preferably made of metal, for example sheet metal. Aluminum-based alloys and copper-based alloys, for example CuSn6 or beryllium copper, are particularly suitable.
  • the spring element is preferably in one piece. Multi-part spring elements can increase the heat transfer.
  • rib-like or tab-like connecting areas protrude from the pressure surfaces attached to the cladding tube, which merge into pressure surfaces on the protective tube which are pressed against the protective tube under prestress.
  • a spring steel sheet can be pushed onto the cladding tube in a clamping manner, which has bent-out tabs, the end sections of which are pretensioned against the protective tube as pressure surfaces in the axial direction widening spring elements which are plugged into one another.
  • the at least one spring element can be fastened to the cladding tube, for example, by spot welding or by clamping. In the case of several spring elements, they can also be held in place by mutually abutting or shape-adapted sections. These sections are preferably located in the area of the pressure surfaces on the cladding tube.
  • the at least one spring element is reduced in height at at least one end, preferably beveled. Bevelling makes it easier to assemble the heating cartridge, spring element and protective tube. The resulting sharp edges can be flanged or turned over. Alternatively, e.g. in the case of a meandering spring element in the end area, the height of the spring element can only be reduced in such a way that it no longer rests on the cladding tube and / or protective tube under prestress. Sharp edges are not so advantageous.
  • the heating cartridge contains a heating insert.
  • a heating insert with at least one PTC element can be arranged inside the cladding tube.
  • the heating insert can contain one or more ceramic PTC elements, which are electrically contacted by a contact sheet.
  • a ground contact can be made via a second contact plate by using the PTC element or elements are arranged between the two contact plates, or via a heat conducting body.
  • the heating insert can additionally contain a positioning frame which positions the heating element or elements.
  • At least one ceramic PTC element with two contact plates is insulated in an opening of a heat conducting body, or accommodated between heat conducting bodies made of a material that conducts heat well, such as aluminum.
  • the heat conducting bodies are preferably produced as extruded parts.
  • the heating element can be placed in a cladding tube made of stainless steel or aluminum.
  • the heating insert or the extruded profile can have at least one indentation on an outside.
  • the cladding tube is drawn together around the heating insert or the extruded profile, which then results in an intimate, good heat transferring contact between the heating insert and the cladding tube.
  • the heating insert can also be introduced into the cladding tube under prestress.
  • the spring element is designed as a corrugated sleeve.
  • the waves can follow one another in the circumferential direction or in the longitudinal direction of the sleeve.
  • the waves can form longitudinal ribs or rings.
  • the wave crests each form pressure surfaces on the protective tube, while the valleys between the waves form pressure surfaces on the extruded profile or the cladding tube.
  • the shafts can each be provided with slots.
  • the spring element can better adapt its circumference to a given protective tube or to thermally induced expansions and contractions.
  • the waves are preferably provided with slots which end in front of the valleys adjacent to the wave. In this way, the thermal coupling to the extruded profile or the cladding tube is not impaired by the slots.
  • the wave troughs are preferably straight in sections as pressure surfaces and thus rest on the heating cartridge over a defined length in good heat-conducting contact.
  • the individual waves are preferably shaped identically, but can also be shaped differently, for example have different amplitudes or wavelengths.
  • the wave trough section has a longitudinal slot. This makes it possible to mount the spring under pretension and thus to achieve an even better heat transfer from the heating cartridge to the spring.
  • Fig. 1 shows schematically the longitudinal section through a container 1 with a medium to be heated, for example the solids cartridge of a reducing agent system.
  • a protective tube 2 is mounted in the container 1 in a fluid-tight manner.
  • a heating cartridge 3 is inserted into this protective tube 2.
  • An air gap 4 is located between the protective tube 2 and the heating cartridge 3.
  • a spring element 6 (shown schematically) is arranged in the air gap 4.
  • the spring element 6 is a corrugated sleeve, the waves are designed as elevations 6.1, which extend in the circumferential direction follow one another. The valleys 6.2 between the waves thus run in the longitudinal direction of the heating cartridge.
  • the spring element 6 is beveled in such a way that the outside diameter of the spring element is smaller than the diameter of the inside of the protective tube at this point. While the heating cartridge 3 is firmly connected to a base part 5 in this illustration, the container 1 can be removed. In the case of a solid cartridge, this can be removed from the vehicle and can therefore be recharged or replaced.
  • Fig. 2 shows a cross section through the container 1 with protective tube 2 and heating cartridge 3, which has a jacket tube 7 on its outside.
  • a spring element 6 is arranged in the air gap 4 between protective tube 2 and cladding tube 7.
  • This spring element is made of metal, for example an aluminum-based alloy or a copper-based alloy, and is designed here to be closed in one piece. However, several individual segments or versions with a longitudinal slot are also conceivable.
  • the spring element 6 has a meandering shape with pressure surfaces 6.1 on the inside of the protective tube 2 and pressure surfaces 6.2 on the outside of the jacket tube 7.
  • the pressure surfaces 6.1, 6.2 are connected to one another by connecting sections 6.3.
  • the middle of the connecting sections 6.4 is indicated on the left half of the drawing.
  • the spring element 6 can advantageously adapt well to the air gap width and the result is total pressure surfaces on the cladding tube 7 and protective tube 2 that are larger than the outer or inner half of the outer or inner surface of the cladding or protective tube, which enables particularly good heat coupling from the Pipes on the spring element 6 causes.
  • a heat conducting profile 8 is arranged in the interior of the cladding tube 7, for example an extruded profile made of aluminum or another metal.
  • a ceramic PTC element 9 with two contact plates 10 is accommodated in an opening 12 of the heat-conducting profile 8, insulated by an insulating film 11.
  • the PTC element 9 or the PTC elements can be held by a positioning frame which can also hold one or both of the contact plates 10.
  • the heat-conducting profile 8 has two indentations 8.1 on its outside. By molded corresponding indentations 7.1 on the cladding tube, the cladding tube 7 is drawn together around the heat conducting profile 8, whereby an intimate, good heat transferring contact between the heat conducting profile 8 and the cladding tube 7 is provided.
  • the protective tube 2 and the heating cartridge 3 are approximately round.
  • other cross-sections for example oval or flat, are also conceivable.
  • the air gap 4 can also have different widths at different points.
  • Fig. 3 shows another embodiment of a heating cartridge with a spring element 6.
  • the heating cartridge 3 has a heating insert with a heat conducting profile 8, for example an extruded profile made of aluminum or another metal, into which one or two contact plates 10 and a or several ceramic PTC elements 9 are used insulated on one or two sides.
  • the PTC element or elements 9 can be held by a positioning frame 22.
  • the heat-conducting profile 8 is not surrounded by a separate cladding tube.
  • the heat conducting profile 8 thus forms a jacket tube for the heating cartridge.
  • a separate cladding tube can also be added to this exemplary embodiment, as in the previous exemplary embodiment.
  • the end of the heat-conducting profile 8 can be sealed, for example, by means of a plastic cap, not shown.
  • the spring element 6 is in the in Fig. 3 shown embodiment as a corrugated sleeve, for example as a corrugated pipe.
  • the waves are not designed as elevations that follow one another in the circumferential direction. Instead, the waves are designed as elevations that follow one another in the longitudinal direction.
  • Each of the waves forms a pressure surface 6.1 for the protective tube and surrounds at the in Fig. 3
  • the heat conducting profile 8 is annular.
  • the spring element 6 can have a continuous longitudinal slot 20.
  • a longitudinal slot 20 makes it easier to arrange the spring element 6 around the heat-conducting profile 8.
  • the longitudinal slot 20 facilitates adaptation to thermally induced changes in length or insertion into a protective tube, so that the sections between the shafts, i.e. the pressure surfaces 6.2, always maintain good thermal contact with the heat conduction profile 8 or a cladding tube.
  • the spring element is extremely preferably applied to the cladding tube under prestress.
  • the radius of the pressure surfaces in the relaxed state can be smaller than the cladding tube radius.
  • the slots 21 subdivide the elevations and thus also the pressure surfaces 6.1 into several strips, which are oriented in the longitudinal direction of the heating cartridge. The slots 21 thus facilitate the compressibility of the spring element 6 without impairing the thermal contact with the heat-conducting profile 8 or the jacket tube.
  • the spring element 6 is preferably fastened at a single end to the heat conducting profile 8 or the jacket tube. In this way, the pressure surfaces 6.2 can move in the longitudinal direction, so that the spring element can adapt to thermally induced changes in length or change its length when it is introduced into a protective tube.
  • Figure 4 shows one possibility of how the spring element 6 of the in Fig. 3 Can be replaced by several spring elements 66 shown embodiment. These spring elements 66 are plugged into one another in the axial direction.
  • Fig. 5 shows one of the in Fig. 4 shown spring elements 66 in a single view.
  • the spring element 66 has an annular base portion from which resilient tabs go out, which are each attached with one end to the base portion and are free at the other end. When installed, these free ends then rest against the protective tube under prestress. For better assembly, the outermost areas of the free ends can be reduced in their axial height, for example curved or rolled away from the protective tube.
  • the base section can be designed as a slotted ring and form a pressure surface 6.2, as described above ..

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  • Resistance Heating (AREA)

Claims (11)

  1. Cartouche chauffante dotée d'un tube de protection (2), notamment pour le chauffage de cartouches solides dans des systèmes SCR, où
    la cartouche chauffante (3) est insérée dans le tube de protection (2) à distance,
    la cartouche chauffante (3) est entourée d'un tube d'enveloppe (7), et
    le tube de protection (2) est en contact sur son côté extérieur avec un milieu à réchauffer,
    caractérisée en ce qu'au moins un élément ressort (6, 66), qui est en contact thermo conducteur avec le tube d'enveloppe (7) et le tube de protection (2), est inséré dans un espace intermédiaire entre le tube d'enveloppe (7) et le tube de protection (2),
    dans laquelle l'au moins un élément ressort (6) présente sur le tube de protection (2) au moins une surface de pression (6.1), qui est pressée de manière élastique contre le côté intérieur du tube de protection (2) dans un état monté par la force de précontrainte en traction de l'au moins un élément ressort (6, 66).
  2. Cartouche chauffante dotée d'un tube de protection (2) selon l'une des revendications précédentes, caractérisée en ce que l'au moins un élément ressort (6, 66) est en métal, de préférence dans un alliage à base d'aluminium ou un alliage à base de cuivre.
  3. Cartouche chauffante dotée d'un tube de protection (2) selon l'une des revendications précédentes, caractérisée en ce que l'au moins un élément ressort (6, 66) présente une fente longitudinale (20) qui s'étend à partir d'une première extrémité de l'au moins un élément ressort (6, 66) jusqu'à une deuxième extrémité de l'au moins un élément ressort (6, 66).
  4. Cartouche chauffante dotée d'un tube de protection (2) selon l'une des revendications précédentes, caractérisée en ce que l'au moins un élément ressort (6) est conçu sous forme d'une gaine ondulée.
  5. Cartouche chauffante dotée d'un tube de protection (2) selon la revendication 4, caractérisée en ce que les ondulations sont conçues sous forme de protubérances qui se suivent les unes les autres dans la direction circonférentielle.
  6. Cartouche chauffante dotée d'un tube de protection (2) selon la revendication 4, caractérisée en ce que les ondulations sont conçues sous forme de protubérances qui se suivent les unes sur les autres dans la direction longitudinale.
  7. Cartouche chauffante dotée d'un tube de protection (2) selon la revendication 5 ou la revendication 6, caractérisée en ce que les protubérances présentent respectivement plusieurs fentes (21).
  8. Cartouche chauffante dotée d'un tube de protection selon la revendication 7, caractérisée en ce que les fentes (21) de la multiplicité qui sont disposées dans une des protubérances, se terminent respectivement avant des protubérances voisines.
  9. Cartouche chauffante dotée d'un tube de protection (2) selon l'une des revendications précédentes, caractérisée en ce que l'au moins un élément ressort (6) est fixé à la cartouche chauffante (3) au niveau d'une de ses extrémités et l'autre extrémité est mobile en direction longitudinale par rapport à la cartouche chauffante (3).
  10. Cartouche chauffante dotée d'un tube de protection (2) selon l'une des revendications précédentes, caractérisée en ce que plusieurs éléments ressorts (66) sont insérés dans l'espace intermédiaire entre la cartouche chauffante (3) et le tube de protection (2).
  11. Cartouche chauffante dotée d'un tube de protection (2) selon la revendication 10, caractérisée en ce que les éléments ressorts (66) sont insérés les uns dans les autres.
EP17709928.0A 2016-03-04 2017-03-01 Cartouche de chauffage avec un tube de protection Active EP3424266B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016002569 2016-03-04
DE102016111258.5A DE102016111258A1 (de) 2016-03-04 2016-06-20 Heizpatrone mit einem Schutzrohr
PCT/EP2017/054760 WO2017149008A1 (fr) 2016-03-04 2017-03-01 Cartouche chauffante avec tube de protection

Publications (2)

Publication Number Publication Date
EP3424266A1 EP3424266A1 (fr) 2019-01-09
EP3424266B1 true EP3424266B1 (fr) 2021-01-20

Family

ID=59650616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17709928.0A Active EP3424266B1 (fr) 2016-03-04 2017-03-01 Cartouche de chauffage avec un tube de protection

Country Status (3)

Country Link
EP (1) EP3424266B1 (fr)
DE (1) DE102016111258A1 (fr)
WO (1) WO2017149008A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017011686A1 (de) 2017-12-18 2019-06-19 I.G. Bauerhin Gmbh Heizeinrichtung zum Beheizen von Flüssigkeiten in einem Reservoir, wie einem Tank oder einem Behälter, eines Fahrzeugs
DE202017006480U1 (de) 2017-12-18 2019-03-19 I.G. Bauerhin Gmbh Heizeinrichtung zum Beheizen von Flüssigkeiten in einem Reservoir, wie einem Tank oder einem Behälter, eines Fahrzeugs

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE431887C (de) * 1925-08-02 1926-07-22 Alfred Klotz Elektrisches Platten-Heizelement mit Metallverkleidung
DE1006601B (de) * 1953-02-23 1957-04-18 Metallwarenfabrik Maybaum Rohrheizkoerper
NL7504083A (nl) * 1975-04-07 1976-10-11 Philips Nv Zelfregelend verwarmingselement.
GB2143708B (en) * 1983-06-23 1986-12-17 Tokai Electric Wire Heating device for heating an air-fuel mixture to be supplied to an internal combustion engine
JPH10220909A (ja) * 1996-12-03 1998-08-21 Komatsu Ltd 流体温度制御装置
FR2803370B3 (fr) * 1999-12-29 2001-12-21 Chia Hsiung Wu Appareil de chauffage a enveloppe de protection
DE10247509A1 (de) * 2002-10-11 2004-04-22 Hotset Heizpatronen U. Zubehör Gmbh Vorrichtung zur Beheizung von zylindrischen Teilen

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
DE102016111258A1 (de) 2017-09-07
WO2017149008A1 (fr) 2017-09-08
EP3424266A1 (fr) 2019-01-09

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