EP3772867B1 - Dispositif de chauffage électrique et son procédé de fabrication - Google Patents

Dispositif de chauffage électrique et son procédé de fabrication Download PDF

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Publication number
EP3772867B1
EP3772867B1 EP20189622.2A EP20189622A EP3772867B1 EP 3772867 B1 EP3772867 B1 EP 3772867B1 EP 20189622 A EP20189622 A EP 20189622A EP 3772867 B1 EP3772867 B1 EP 3772867B1
Authority
EP
European Patent Office
Prior art keywords
heating
heating element
housing
ptc
partition wall
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
EP20189622.2A
Other languages
German (de)
English (en)
Other versions
EP3772867A1 (fr
Inventor
Michael Niederer
Sascha Hort
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.)
Eberspaecher Catem GmbH and Co KG
Original Assignee
Eberspaecher Catem 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 Eberspaecher Catem GmbH and Co KG filed Critical Eberspaecher Catem GmbH and Co KG
Publication of EP3772867A1 publication Critical patent/EP3772867A1/fr
Application granted granted Critical
Publication of EP3772867B1 publication Critical patent/EP3772867B1/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
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating 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—Heating 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
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0288—Applications for non specified applications
    • H05B1/0294—Planar elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1863—Arrangement or mounting of electric heating means
    • F24H9/1872—PTC
    • 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
    • H05B3/0019—Circuit arrangements
    • 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H2250/00—Electrical heat generating means
    • F24H2250/04—Positive or negative temperature coefficients, e.g. PTC, NTC
    • 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
    • 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
    • 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
    • H05B2203/023—Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system

Definitions

  • the present invention relates to an electric heating device with a housing which has a partition wall which separates a connection chamber from a heating chamber for dissipating heat. At least one PTC element protrudes from the partition in the direction of the heating chamber. This PTC heating element is exposed in the heating chamber in the manner of a heating rib.
  • the PTC heating element has at least one PTC element and conductor tracks connected thereto in an electrically conductive manner, which are assigned different polarities for energizing the PTC element. These conductor tracks are electrically connected to the power current in the connection chamber.
  • Such a heater is off, for example EP 1 872 986 A1 , EP 2 337 425 A1 or DE 10 2004 043 699 A1 known.
  • Another electric heater of the same generic type is off EP 3 334 242 A1 or EP 3 493 650 A1 known.
  • the PTC heating element is first produced as a separate component and as such is inserted into a heating element mount formed on the partition wall, so that the connection-side end of the heating element housing is sealed in the heating element mount of the partition wall and the conductor tracks with their free, connection-side ends are exposed in the connection chamber in order to be electrically connected there.
  • the PTC heating element preassembled in this way is held in the heating element receptacle by friction.
  • the PTC heating element has a labyrinth seal formed by the heating element housing, which is pressed into the heating element receptacle.
  • the attachment of the PTC heating element be suitable at least for the assembly of the individual components of the previously known electrical heating device.
  • the PTC heating element is supported on its underside opposite the connection side on a base, which closes off the heating chamber in the previously discussed example. In this way, the PTC heating element is clamped between the floor and the heating element holder and secured in its installation position.
  • the present invention is based on the problem of specifying an improved electrical heating device of the type mentioned at the outset.
  • an electric heating device with the features of claim 1.
  • This has a holding element which encompasses the heating element housing.
  • the holding element has a receiving opening, which usually surrounds the heating element housing and grips it in such a way that a mechanical connection is produced between the heating element housing and the holding element.
  • a connection is usually a connection that acts at least in a non-positive or frictional manner.
  • the heating element housing can first be joined during production, for example with the separately prepared housing, specifically with the partition wall of the electrical heating device, for example plug-connected, as is shown below EP 3 334 242 A1 is known in principle, and by pushing the retaining element onto the heating element housing from the side of the heating chamber, the heating element housing reaches around the heating element.
  • the holding element usually has holding projections which bear against the outer surface of the heating element housing, for example in the form of elastic spring tongues which interact with the outer surface of the heating element housing.
  • the holding element according to the invention is connected to the partition on its side facing the heating chamber.
  • the holding element is also connected to the heating element housing by the aforementioned non-positive or frictional connection.
  • the retaining element causes the heating element housing to be mechanically secured relative to the housing of the electrical heating device and thus to the partition wall.
  • the present invention is also suitable for the mechanical attachment of heating elements, which are different than those according to plug-in contacting EP 3 334 242 A1 are connected to the housing of the electric heater and thus the partition.
  • the solution according to the invention offers an additional possibility of securing the heating element housing with respect to the housing of the electric heating device due to the holding element, even if this is designed in one piece with the partition wall or is connected to it with a material connection, for example by welding.
  • a sealing element ensures the sealing of the PTC heating element held in the heating element receptacle of the partition.
  • each PTC heating element is usually provided with a sealing element, whereas usually only one holding element is provided for all PTC heating elements of the heating device.
  • the solution according to the invention brings particular advantages in connection with plug-contacted heating element housings which are held in the partition wall or at least accommodated in a sealed manner and which are initially produced separately. Because that
  • Retaining element can mechanically fasten and thus secure such heating element housings permanently and reliably with respect to the housing of the electrical heating device. For this purpose it is usually only necessary to slide the holding element over the heating element housing from the heating chamber side and to connect it to the housing of the electrical heating device.
  • connection between the holding element and the heating element housing is preferably--as already explained above--a non-positive connection.
  • the retaining element is preferably also connected in a non-positive manner to the partition wall and thus to the housing of the electrical heating device.
  • a solid mechanical connection can thus be created by pushing on the retaining element and placing the retaining element against the partition wall.
  • This connection can take place in that the retaining element applied to the partition wall is subsequently caulked or reshaped and/or connected in some other way.
  • the retaining element is preferably connected to the housing of the heating device simply by placing it against and pressing it against the partition wall.
  • the holding element only has to be pushed over the heating element housing and applied with a certain pressing force, for example against the partition wall, in order to bring the holding element into its installation position and thus mechanically connect it to the heating element housing on the one hand and the partition wall on the other.
  • the solution according to the invention also offers the advantage that the holding element can interact with the heating element housing as a shield in order to connect it electrically, for example, to a ground pole or to ground that is provided via the housing of the electrical heating device.
  • the housing can be fully or partially electrically conductive. It can also only hold and fix a ground pole to which the holding element is electrically connected in the installed position.
  • the shielding of the PTC element within the heater housing requires a heater shield that is part of the heater housing.
  • Such a shield can be formed, for example, by a sheath enclosing the PTC element.
  • This casing can be an electrically conductive configuration, preferably made of metal, which usually completely surrounds the PTC element.
  • Such an embodiment can be connected to a plastic housing as a shielding grid, which adds the PTC heating element and the contact plates to form a unit, as shown in FIG EP 3 334 242 A1 is known.
  • Such a casing enclosing the PTC element is made of an electrically conductive material, for example U.S. 2008/0173637 A1 known.
  • the PTC element and the electrically conductive conductor tracks adjacent to it are each placed in a tube with a rectangular cross-section with an insulating layer in between, the inner surface of which is placed in a thermally conductive manner on the insulating layer and thus indirectly on one of the heat decoupling surfaces of the PTC elements inside the tube.
  • a heating element of this type also offers the possibility of forming a casing that encloses the PTC element.
  • the heating rod does not necessarily have to be closed off with a shielding element at its free lower end facing away from the partition wall, although such an element is preferable as a stopper to form a complete enclosure.
  • the shielding can also be formed by a pocket that seals in the at least one PTC element and the two conductor tracks over the entire circumference, which is closed on its underside and also otherwise encloses the PTC element and the conductor tracks in a sealed manner, with electrical contact tongues, which are usually in one piece from the conductor tracks forming contact sheets are formed, protrude beyond the outside of the pocket.
  • Such a pocket can be formed, for example, from a sheet metal material that is first prepared as a tube, then equipped with the PTC element and the conductor tracks and then formed, so that heat decoupling surfaces of the PTC element are in thermally conductive contact with the inner surfaces of the pocket.
  • the pocket can also be filled with a thermally conductive compound, for example a silicone compound, in order to connect the inner surface of the pocket to the heat decoupling surfaces of the PTC element with the best possible thermal conductivity. It goes without saying that such a PTC element and the conductor tracks connected thereto in an electrically conductive manner are supported in an insulated manner within such an electrically conductive pocket.
  • the conductor tracks, the PTC element and insulating layers that usually rest on both sides of the main side surfaces of the PTC element, which are the largest side surfaces of the PTC element and accordingly form the relevant heat decoupling surfaces can be pre-assembled in a holder made of an insulating material, which is inserted into the bag is brought in. It is just as well possible to equip the pocket with the insulating layers and the contact plates that form the conductor tracks and to arrange the PTC element or elements between the conductor tracks, with the pocket then preferably being formed from the outside in order to line the inner walls with good Apply thermal conductivity with the interposition of the insulating layers and the conductor tracks against the heat decoupling surfaces of the PTC element. Thereafter, the pocket may be filled with the thermally conductive compound.
  • the previously mentioned pocket encloses the electrically conductive elements of the PTC heating element around its circumference and, thanks to the metallic material of the pocket, also offers an electrically shielding covering for the at least one PTC element inside the pocket.
  • the retaining element surrounding this casing which is electrically conductively connected to the casing, results in external contacting of the shielding via the retaining element, which in turn can be connected to a ground pole that is assigned to the partition wall or formed by it.
  • the connection chamber for each individual heating element housing only the usually two connection lugs of the two conductor tracks per heating element have to be electrically connected.
  • the connection of the same to the shielding is simplified by pushing the retaining element onto all of the heating element housings.
  • these are preferably of identical design and accordingly protrude with the same length from the partition wall, which is usually of planar design.
  • the aforementioned shield preferably also extends over the terminal chamber, which for this purpose has a terminal chamber shield that electromagnetically shields this terminal chamber.
  • This shielding can be formed in that the housing parts that form the connection chamber are made of an electrically conductive material, in particular metal.
  • the dividing wall can be formed in one piece on the connection chamber side with a peripheral edge which is provided with a metallic housing cover for the connection chamber, as shown in FIG EP 3 334 242 A1 is known to also seal the connection chamber, so that no moisture and no dirt can get into the connection chamber.
  • the dividing wall and parts of the housing can just as well be made of plastic with a shield connected thereto.
  • the shield can be arranged in the plastic housing by overmoulding.
  • a person skilled in the art is aware of various options for providing the connection chamber and/or the partition wall with electromagnetically effective shielding.
  • This shielding is electrically conductively connected to the holding element, so that the shielding extends from the heating elements via the holding element to the connection chamber shielding. This provides effective EMC protection for the electrical heating device.
  • the housing has at least one locking projection surrounding the holding element on the outside.
  • This locking projection is usually made in one piece with the partition wall forming housing formed.
  • the holding element has a housing connection tongue which rests against the locking projection under pretension.
  • the configuration is preferably chosen such that after the holding element has been slid onto the heating element housing, the holding element is also electrically connected to the housing via the housing connection tongues.
  • the housing connection tab usually rests against a surface of the locking projection under elastic pretension; the housing connection tab usually scratches along the corresponding surface when the retaining element is pushed onto the heating element housing.
  • a plurality of locking projections formed by the housing and a plurality of housing connecting tongues associated with them are usually provided. Furthermore, it is preferable to connect the holding element not only in a non-positive manner but also in a form-fitting manner to the partition wall or to the housing forming the partition wall.
  • the holding element and the housing preferably have mutually associated functional surfaces which interact in such a way that the holding element is held in its installed position in a predetermined arrangement and alignment relative to the partition wall or the housing.
  • the partition can form a collar which preferably surrounds the at least one heating element housing.
  • this collar is encompassed by the holding element.
  • the retaining element has an edge that runs all the way round at least in sections and is at least designed in such a way that it interacts with the collar on opposite sides and encompasses it. This results in a positive positioning of the holding element relative to the partition.
  • the edge preferably runs around the entire circumference of the outer contour of the holding element and interacts with a collar that is also formed over the entire circumference.
  • the holding element is formed by a one-piece sheet metal element.
  • This sheet metal element forms the receiving opening already described above.
  • the previously discussed edge on the sheet metal element is preferably also formed by bending and stamping.
  • the holding element is preferably essentially flat and does not build up or only slightly builds up in the height direction of the PTC heating element.
  • At least one, preferably several, contact tongues are provided by stamping and bending, which are exposed in the receiving opening and bear against the heating element housing under elastic pretension.
  • the contact tongue differs from the spring segment in that the former also provides electrical contact with the outer surface a shield.
  • the contact tongues usually protrude from the plane of the sheet metal element in the direction of the lower end of the heating element housing from the receiving opening.
  • the present invention specifies a method for producing an electrical heating device with the features of claim 13, which has already been presented previously with its essential method steps.
  • the retaining element is slid over the heating element housing, there is usually a frictional connection between these two elements, which are previously produced separately and only joined together after the heating element housing has been connected to the partition.
  • the heating element housing or housings are first secured to the partition wall via the holding element before electrical connection elements of the conductor tracks, for example connection lugs, which are formed in one piece by contact plates for the individual PTC elements, are electrically connected in the area of the connection chamber.
  • a floor element like it out EP 3 334 242 A1 is known to be connected to the housing forming the dividing wall, in order to form the heating chamber as a substantially circumferentially closed circulation chamber, each with an inlet and outlet connector for the usually liquid medium to be heated.
  • the heating element housing of each individual PTC heating element is exposed in this circulation chamber in the manner of a heating rib.
  • the 1 shows an exemplary embodiment of a holding element 2 formed by stamping and bending, which has a multiplicity of receiving openings 4 extending parallel to one another and formed as an elongated hole, into which contact tongues 6 protrude on opposite longitudinal sides of the receiving openings 4 .
  • housing connection tongues 8 are provided on the in 1 rear longitudinal edge of the holding element 2 .
  • There three housing connection tongues 8 are provided here.
  • a further housing connection tongue 8 is located on opposite transverse sides of the holding element 2, which is designed as a parallelogram in its base area.
  • the holding member 2 is formed by punching and bending a sheet metal material.
  • the housing connection tongues 8 and the contact tongues 6 protrude from the flat sheet metal material on one side, whereas a completely closed peripheral edge 10 protrudes from the other side, which is formed from the plane of the sheet metal material by bending the same.
  • the contact tongues 6 have - as can be seen in particular 4 results - a fastening-side end, which is connected to the edge of the receiving opening 4 and protrudes from it, and a free end, which is bent over again opposite a web-shaped section protruding obliquely from the plane of the sheet metal material and is essentially at right angles to the plane of the sheet material extends.
  • the free end of the contact tongue 6 can end with sharp edges.
  • the holding element 2 can be made of brass, steel, copper or aluminum. A material should be selected that has good electrical conductivity on the one hand and a certain spring stiffness on the other hand, so that the contact tongues can rest against the heating element housing with good contact pressure.
  • the PTC heating elements are in 2 marked with reference numeral 12. They have a heating element housing 14, which is formed from sheet metal and 2 encloses conductor tracks, not shown, in the form of contact plates, which are electrically conductively contacted with opposite side surfaces of a PTC element, also not shown. Details of such a design are EP 3 334 242 A1 refer to. Also located within heater housing 14 is insulation prevents the contact plates from coming into electrical contact with the inner surface of the heating element housing 14. This is because the sheet metal material forming the heating element housing 14 is electrically conductive and forms a circumferential casing that shields the PTC element circumferentially.
  • the PTC element and the contact plates are also encapsulated and then separated from the medium to be heated via this casing, which flows against the outside of the heating element housing for heating in order to absorb and dissipate the heat generated by the PTC element.
  • the PTC heating elements protrude from a housing 16 which forms a heating element receptacle 18 for each PCT heating element 12 .
  • the end of the PTC heating element 12 on the connection side is inserted into this heating element receptacle 18 .
  • the heating element housing 14 is usually provided with a peripheral seal on its outer circumference, which seals against the walls of the housing 16 that define the heating element receptacle 18, cf. EP 3 334 242 A1 .
  • the housing 16 may be a die-cast metal housing.
  • the housing 16 can just as easily be an injection-molded plastic housing, in which a shield is incorporated or such a shield is connected to the plastic housing, for example by overmoulding with the plastic.
  • a plug housing 20 for the power current and a plug housing 22 for control signals are connected to the housing 16 at diagonally opposite corners of the housing 16, which is basically designed with a rectangular base area.
  • the two connector housings 20, 22 are made of plastic and connected to the housing 16 with a seal interposed.
  • the housing 16 is basically designed in the shape of a bowl, with a bottom of the bowl forming a partition wall 24 in which the heating element receptacles 18 are recessed.
  • This partition wall 24 is surrounded on the circumference by a peripheral housing wall 26 which encloses a receiving chamber.
  • the contact plates of the individual PTC heating elements 12 are exposed in each case in this connection chamber, which is identified by reference number 28, for the electrical connection to the power current.
  • the connection chamber 28 usually also accommodates a control device that controls all the PTC heating elements and, if necessary, groups them into different heating circuits.
  • a heating chamber is indicated with reference number 30 on the side of the partition wall 24 opposite the connection chamber 28 .
  • this heating chamber 30 is completed by a further housing element, not shown, which encloses and encloses all PTC heating elements 12 excluding the connector housing 20, 22 has a bottom so that a circulation chamber is formed as a heating chamber, which is accessible from the outside through inlet and outlet sockets, in order to circulate a medium to be heated in the circulation chamber and to guide it past the surfaces of the PTC heating elements 12 in order to heat the medium .
  • the holding element 2 In the 2 is the holding element 2 after 1 provided in extension of the free ends of the PTC heating elements 12.
  • the directional lines P indicate the assembly direction. In this way, the holding element 2 is pushed over the individual heating element housings 14 .
  • the contact tongues 6 lie against the outer surface of the heating element housing 14 and make electrical contact with them. They scrape against the outer surface of the heating element housing 14 when the retaining element is applied.
  • the 3 shows the installation position of the holding element 2.
  • the edge 10 of this holding element 2 encompasses a partition wall 24 that surrounds the circumference and is in 2 collar identified by reference numeral 32.
  • the holding element 2 is positioned relative to the partition wall 24 and thus to the housing 16 .
  • the contact tongues 6 provided on the opposite long sides of the elongated holes contact the opposite main side surfaces of the heating element housing 14. This results in electrical contacting between these heating element housings 14 and the retaining element 2, which can also have a form-fitting effect when the contact tongue 6 tapers to a point.
  • the housing 16 has a plurality of locking projections 34 which protrude from the partition wall 24 in the direction of the heating chamber 30 and which in the present case are formed in one piece with the die-cast housing.
  • the housing connection tongues 8 are in electrically conductive contact with these locking projections 34 .
  • the housing connection tongues 8 scrape past the surface of the locking projections 34, so that on the one hand there is a form-fitting, sometimes also clawing and thus form-fitting connection, which also brings about an electrical contact between the holding element 2 and the housing 16.
  • This connection is also electrically conductive.
  • the connection between the holding element 2 and the heating element housing 14 is also electrically conductive Receives PTC elements of the PTC heating elements 12 and surrounds the connection ends of the contact tongues for the electrical connection of the PCT elements in the region of the connection chamber 28 . After applying a cover for the connection chamber 28, all current-carrying components of the exemplary embodiment are electromagnetically shielded.
  • the electrical connections required for this can be created simply by pressing the holding element 2 onto the heating element housing 14 on the one hand and the housing 16 on the other. Otherwise no fasteners or the like are required to firmly connect the holding element 2 to the housing 16 .
  • the figure 7 12 illustrates details of the PTC heating element 12, which in the present case has only one PTC element 40, which is covered with an insulating layer 44 on its opposite main side surfaces 42.
  • the insulating layers 44 are formed by a plastic film, for example made of Kapton.
  • the PTC element 40 is designed as a small plate with a width B or a length L that is greater by a factor of at least 10 than a thickness that corresponds to the distance between the two main side surfaces 42 .
  • Contact plates are provided as conductor tracks 48 in the sense of the invention on opposite main side surfaces 42, which are glued to the ceramic PTC element 40 and thus electrically conductive to a surface metallization of the PTC element 40, which can be applied as a layer by means of PVD or CVD. can be connected.
  • the conductor tracks 48 can also only be placed on the PTC element 40 .
  • Each conductor track 48 forms a contact surface 50 which rests in an electrically conductive manner on the main side surface 42 of the PTC element 40 and a contact tongue 5 which projects beyond the PTC element 40 on one side.
  • the contact surface 50 is provided congruently with the main side surface 42 of the PTC element 40 .
  • the insulating layer 44 lies on the side facing away from the PTC element 40 on the conductor tracks 48 and covers it.
  • the PTC element 40 is accommodated in a frame 56 which has a frame opening 58 for this purpose.
  • An upper transverse beam 62 of the frame 56 is formed in one piece with a lead-through element base 64 which, together with a lead-through segment cover 66, forms a type of plug over which a stop collar 68 protrudes.
  • the bushing segment cover 66 has bores 70 for pins of the bushing segment base 64 to be hot-swaged and half-shells 72 aligned with the contact tongues 52 .
  • the contact tongues 52 of each of the contact plates 48 project beyond the upper transverse bar 62.
  • the so The assembly produced is placed in a deep-drawn part, identified by the reference numeral 74, which is made by deep-drawing sheet material and has a single opening 76 surrounded by a sealing element 78 made by overmolding the frame 56.
  • the contact tongues 52 are plug-contacted in the connection chamber 28 .
  • the sealing element 78 is inserted in the heating element receptacle 18 in a sealing manner.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Air-Conditioning For Vehicles (AREA)

Claims (13)

  1. Dispositif de chauffage électrique (2), comprenant :
    un boîtier (16) avec une paroi de séparation (24), qui sépare une chambre de connexion (28) d'une chambre de chauffage (30) pour une distribution de chaleur, et à partir de laquelle au moins un dispositif de chauffage électrique PTC (12) avec un boîtier d'élément chauffant (14) fait saillie dans la direction de la chambre de chauffage (30), qui est maintenu de manière étanche dans la paroi de séparation (24) par l'intermédiaire d'un élément d'étanchéité (78) et dans lequel au moins un élément PTC et des pistes conductrices avec une polarité différente connectées de manière électriquement conductrice à celui-ci pour l'alimentation en courant de l'élément PTC (40), qui sont connectées électriquement dans la chambre de connexion (28), sont soutenus de manière isolée,
    caractérisé par
    un élément de maintien (2) qui entoure le boîtier d'élément chauffant (14), qui est connecté au boîtier d'élément chauffant (14) avec la paroi de séparation (24) sur son côté dirigé vers la chambre de chauffage (30).
  2. Système de chauffage électrique selon la revendication 2, caractérisé en ce que l'élément de maintien (2) est relié au moins par friction à la paroi de séparation (24) et/ou au boîtier d'élément chauffant (14).
  3. Dispositif de chauffage électrique selon la revendication 1 ou 2, caractérisé en ce que le boîtier d'élément chauffant (14) présente un blindage d'élément chauffant (14) protégeant l'élément PTC de manière électromagnétique et en ce que le blindage d'élément chauffant (14) est connecté électriquement à l'élément de maintien (2).
  4. Dispositif de chauffage électrique selon la revendication 3, caractérisé en ce que le blindage d'élément chauffant (14) est formé par une enveloppe entourant l'élément PTC.
  5. Dispositif de chauffage électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la chambre de connexion (28) est munie d'un blindage de chambre de connexion qui protège de manière électromagnétique la chambre de connexion (28) et qui est connecté de manière électriquement conductrice à l'élément de maintien (2).
  6. Dispositif de chauffage électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (16) forme au moins une saillie de verrouillage (34) entourant l'élément de maintien (2) sur le côté extérieur et en ce que l'élément de maintien (2) forme une languette de connexion de boîtier de connexion (8) qui s'applique sous précontrainte sur la saillie de verrouillage (34).
  7. Dispositif de chauffage électrique selon la revendication 6, caractérisé en ce que la languette de connexion de boîtier de connexion (8) est appliquée de manière électriquement conductrice contre la saillie de verrouillage (34).
  8. Dispositif de chauffage électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la paroi de séparation (24) forme une collerette (32) entourant circonférentiellement le au moins un boîtier d'élément chauffant (14) et qui est mise en prise par l'élément de maintien (2).
  9. Dispositif de chauffage électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément chauffant (2) est un élément en tôle d'un seul tenant, traité par estampage pour former une ouverture de réception (4) pour l'élément chauffant.
  10. Dispositif de chauffage électrique selon la revendication 9, caractérisé en ce que l'élément de maintien (2) est sensiblement plat.
  11. Dispositif de chauffage électrique selon la revendication 9 ou 10, caractérisé en ce qu'au moins une languette de contact (6) formée d'un seul tenant sur l'élément en tôle est exposée dans l'ouverture de réception (4), qui s'applique sous précontrainte élastique sur le boîtier d'élément chauffant (14).
  12. Dispositif de chauffage électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément d'étanchéité (78) est reçu de manière étanche dans un logement d'élément chauffant (18) de la paroi de séparation (24).
  13. Procédé de fabrication d'un dispositif de chauffage électrique (2) selon l'une quelconque des revendications précédentes, dans lequel tout d'abord un boîtier (16) avec une paroi de séparation (24), qui sépare une chambre de connexion (28) d'une chambre de chauffage (30) pour une distribution de chaleur, et au moins un élément chauffant PTC (12) avec un boîtier d'élément chauffant (14), dans lequel au moins un élément PTC et des pistes conductrices avec une polarité différente connectées de manière électriquement conductrice à celui-ci pour l'alimentation en courant de l'élément PTC, sont soutenus de manière isolée dans le boîtier d'élément chauffant (14), sont fabriqués, l'élément chauffant PTC (12) et un élément d'étanchéité (78) sont introduits dans un logement d'élément chauffant de la paroi de séparation (24), de sorte que l'élément chauffant PTC (12) fait saillie dans la direction de la chambre de chauffage (30) à partir de la paroi de séparation (24) et est maintenu de manière étanche dans la paroi de séparation (24) par l'intermédiaire de l'élément d'étanchéité (78), et un élément de maintien (2) qui coopère avec le boîtier d'élément chauffant (14) est déplacé par l'intermédiaire du boîtier 'élément chauffant (14) et est connecté à la paroi de séparation (24) sur son côté tourné vers la chambre de chauffage (30).
EP20189622.2A 2019-08-06 2020-08-05 Dispositif de chauffage électrique et son procédé de fabrication Active EP3772867B1 (fr)

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US11856658B2 (en) 2019-08-06 2023-12-26 Eberspächer Catem Gmbh & Co. Kg Electric heating device

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CN208675677U (zh) * 2018-07-27 2019-03-29 中航光电科技股份有限公司 一种屏蔽网及使用该屏蔽网的连接器
DE102019217234A1 (de) * 2019-11-07 2021-05-12 Eberspächer Catem Gmbh & Co. Kg PTC-Heizeinrichtung und elektrische Heizvorrichtung mit einer solchen PTC- Heizeinrichtung und Verfahren zur Herstellung einer elektrischen Heizvorrichtung
EP3866564A3 (fr) * 2019-12-27 2021-10-13 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique
DE102020202453B4 (de) * 2020-02-26 2022-09-29 Eberspächer Catem Gmbh & Co. Kg Elektrische Heizvorrichtung und Verfahren zu deren Herstellung
EP4243568A1 (fr) 2022-03-09 2023-09-13 MAHLE International GmbH Dispositif de chauffage électrique
EP4242547A1 (fr) 2022-03-09 2023-09-13 MAHLE International GmbH Dispositif de chauffage électrique
CN114475159B (zh) * 2022-04-12 2022-06-21 深圳阿里兄弟科技有限公司 一种用于电动汽车空调硅胶加热膜加热设备
DE102022205705A1 (de) 2022-06-03 2023-12-14 Mahle International Gmbh Heizeinrichtung zum Heizen eines Fluids

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EP2428746B8 (fr) * 2010-09-13 2021-12-29 MAHLE Behr GmbH & Co. KG Echangeur de chaleur
EP2440004B1 (fr) * 2010-10-08 2015-02-25 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique
EP2505931B2 (fr) * 2011-03-30 2022-01-12 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique doté d'un élément plat comprenant des pistes conductrices et procédé de fabrication d'un tel élément plat
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Publication number Priority date Publication date Assignee Title
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CN112351520B (zh) 2022-10-11
CN112351520A (zh) 2021-02-09
EP3772867A1 (fr) 2021-02-10
US20210045194A1 (en) 2021-02-11

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