EP2118579A1 - Module chauffant électrique conçu pour réchauffer un flux d'air, en particulier pour chauffer et ventiler des sièges - Google Patents

Module chauffant électrique conçu pour réchauffer un flux d'air, en particulier pour chauffer et ventiler des sièges

Info

Publication number
EP2118579A1
EP2118579A1 EP08707462A EP08707462A EP2118579A1 EP 2118579 A1 EP2118579 A1 EP 2118579A1 EP 08707462 A EP08707462 A EP 08707462A EP 08707462 A EP08707462 A EP 08707462A EP 2118579 A1 EP2118579 A1 EP 2118579A1
Authority
EP
European Patent Office
Prior art keywords
module according
heating module
electric heating
retaining rings
electrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08707462A
Other languages
German (de)
English (en)
Inventor
Ingo Schehr
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.)
MicroHellix GmbH
Original Assignee
MicroHellix GmbH
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 MicroHellix GmbH filed Critical MicroHellix GmbH
Publication of EP2118579A1 publication Critical patent/EP2118579A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/105—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being corrugated elements extending around the tubular elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
    • B60H1/2225—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters arrangements of electric heaters for heating air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/56—Heating or ventilating devices
    • B60N2/5678—Heating or ventilating devices characterised by electrical systems
    • B60N2/5685—Resistance
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0429—For vehicles
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0429—For vehicles
    • F24H3/0435—Structures comprising heat spreading elements in the form of fins
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0429—For vehicles
    • F24H3/0452—Frame constructions
    • F24H3/0476—Means for putting the electric heaters in the frame under strain, e.g. with springs
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0429—For vehicles
    • F24H3/0452—Frame constructions
    • F24H3/0482—Frames with integrated fan
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2268—Constructional features
    • B60H2001/2293—Integration into other parts of a vehicle

Definitions

  • Electric heating module for air flow heating, in particular for heating and ventilation of seats
  • the invention relates to an electric heating module for air flow heating according to the preamble of claim 1.
  • This heating module is provided in particular for heating and ventilation of seats. It comprises at least one PTC heating element and at least one adjacent annular, air-permeable heat-dissipating area with heat-conducting lamellae arranged essentially radially, which are in operative connection with the PTC heating element and are combined with it to form a module.
  • PTC elements are semiconductor resistors made of ceramics whose ohmic resistance is temperature-dependent.
  • the resistance-temperature characteristic behaves non-linearly: The resistance of a PTC heating element initially drops slightly with increasing component temperature, then rises very steeply at a characteristic temperature (reference temperature).
  • the PTC resistance increases rapidly, limiting the electrical power consumption to a very low value.
  • the component temperature then approaches an upper limit, which depends on the heat absorption of the environment of the PTC heating element. Under normal environmental conditions, the component temperature Thus, the PTC heating element does not rise above a characteristic highest temperature, even if the desired heat dissipation in case of failure is completely interrupted.
  • Heating elements for use in heating or air conditioning systems of vehicles or in other applications of air flow heating in vehicles For safety reasons, in this area of application, even in the event of a malfunction, no flammable temperatures may occur in the heating element, although a high heat output is nevertheless required in normal operation.
  • EP 1 479 918 A1 discloses a complete fan module, comprising a radial fan integrated in a housing and a heating module of the type mentioned initially, which is intended to serve for seat heating in a ventilated motor vehicle seat. Since a motor vehicle seat for safety reasons, even at failure of the fan on the surface of a maximum temperature that is tolerable for humans must not exceed, heating modules with PTC heating elements are ideal, especially since they can give a much higher heat output with the same safety, than the conventional mats used in seat heaters with electrical resistance wires whose power consumption must be very limited for safety reasons.
  • the previously known electric heating modules of the type mentioned are usually made of several layers of surface next to each other, with its narrow side in the air flow PTC heating elements, which are electrically contacted at their flat tops and their lower sides with contact plates.
  • the adjacent thereto heat dissipation areas have meandering arranged metal fins, which also with their Narrow side in the air flow and thermally contact the contacting of the PTC heating elements on its broad side at regular intervals for a heat transfer.
  • thermally conductive adhesives or other bonding techniques can be used; However, it has established itself as the most efficient solution to put the PTC heating elements and the heat-conducting lamellae in a module summarizing this frame and to provide within the frame at least one spring element, the alternately arranged nickeltgabebe- rich with thermally conductive fins and the webs with presses the PTC heating elements together.
  • an electric heating module of the type mentioned is proposed with an annular, in particular circular heat dissipation area, in which the heat-conducting fins are arranged substantially radially. This simplifies the assembly, especially if it is to be automated, and increases the efficiency of the heat transfer to the guided through the slats or the heat dissipation area airflow.
  • Another example of a blower module for motor vehicle seats can be found in EP 1 464 533 A1.
  • An example of a heating module, which is provided in the manner of a hair dryer with a fan and resistance heating wires in the air stream and integrated into a vehicle seat, is described in US 6,541, 737 B1.
  • the present invention seeks to improve an electric heating module of the type mentioned in terms of its ease of installation and in terms of the required installation space in a seat.
  • the present invention thus improves the hitherto known design of an electrical heating module of the type mentioned above in that a heat-conducting retaining ring is provided with a substantially circumferential circumferential groove in which the blades sit with their respective radially inner portion or end.
  • the groove of the retaining ring is accordingly adapted to the width of the radially inner portion of the slats, so that they can also be inserted into the groove.
  • a flattened, elliptical or stadium-shaped ring shape and the shape of an N-corner is possible, as is the case for the heat dissipation area with the heat-conducting fins.
  • the term "ring" refers essentially to the annular groove in the retaining ring, while the retaining ring itself may also be a solid disc or a hollowed-out disc, or possibly also consist of several parts or segments Slats sit in a substantially circumferential groove of the heat-conducting retaining ring, there find their support and dissipate heat from this.
  • the groove of the retaining ring according to the invention in which the lamellae are seated, can be formed by two circumferential webs, wherein the retaining ring preferably has a double T-shape in a lateral view.
  • the retaining ring is preferably cylindrical in shape at least in the region of the groove For lamellae of constant radial extent, this results in a circular heat release area, which is favorable for flow and is therefore preferred
  • the groove of the retaining ring need not be completely encircling, but may, for example, have a gap through which an electrical contact can be made
  • the retaining ring according to the invention is made of extruded aluminum.
  • An aluminum press part has a particularly high thermal conductivity, so that the hot flow typical of the operation of the electrical heating module according to the invention, which is carried out by the PTC heating element in the hot-emitting lamellae, is particularly high
  • a particularly efficient and advantageous production of the electric heating module according to the invention is made possible by the fact that the lamellae are clamped between the Rare walls of the groove, as far as the groove is formed by two circumferential ridges, this can be achieved by caulking the ridges with the lamellae or In addition to a high stability of this connection, there is also a very good heat transfer from the retaining ring in the slats, while the connection can be made quickly and efficiently by machine
  • the lamellae are made of at least one maanderformig bent and / or folded metal strip.
  • the radially inner ends of the lamellae or the radially inner portions of the lamellae are bent in the form of an outer rim, so that a particularly high stability in the transverse direction, ie from narrow side to narrow side of the blade results here
  • the clamping or caulking of the fins in the groove of the retaining ring can then take place with high forces, resulting in said high stability and high heat conductivity of the compound further improved by the fins press into the side walls of the groove.
  • the fins may be formed so that their narrow sides are substantially crescent-shaped.
  • the fins may be twisted in their radial course, so that their broad sides are at least partially tilted against the axial direction and thus against the direct air flow direction.
  • These shapes result in deflections and turbulence in the air flow, which may allow it to increase the convective heat transfer in the air and thus increase the heat output through the slats.
  • the output power of the PTC heating element and consequently of the electric heating module as a whole also increases.
  • a preferred, fundamental possibility of the arrangement of the PTC heating element on the retaining ring according to the invention is that the retaining ring has a substantially radially extending contact surface for direct or indirect thermal contact with the PTC heating element, so that the PTC heating element with its broad side transverse to Air flow direction rests on the retaining ring.
  • a particularly compact and advantageous to be further development of this principle consists in the sequential arrangement of two retaining rings with inserted lamellae in the axial direction, while the PTC heating element is disposed between the retaining rings and is in heat-conducting contact with two retaining rings, in particular directly between the two Contact surfaces of the two retaining rings sits and thus not only in thermally conductive contact with the retaining rings is, but also electrically contacting this is applied. Accordingly, it is expedient if the retaining rings are provided with connecting elements for electrical contacting, whereby a separate contacting of the PTC heating element is unnecessary.
  • a soft elastic ring seal is inserted between the two contact surfaces of the two retaining rings and surrounds the PTC heating element annular.
  • the soft elastic seal is provided with a cross section widening radially outward. For radially inside it must allow it that the PTC heating element as close as possible and with a certain contact pressure against the contact surfaces of both retaining rings, while outward the sealing effect of the soft elastic seal is of primary importance.
  • the PTC heating elements can also be contacted so that the plate packs do not carry electricity.
  • the electrical connection elements are each arranged between the PTC heating element and the two contact surfaces of the two retaining rings, wherein an electrically insulating, but thermally conductive insulating film in each case between the electrical Closing element and the contact surface of the associated retaining ring sits.
  • the retaining rings are therefore electrically isolated from the PTC heating element.
  • the aforementioned soft elastic seal between the two contact surfaces of the two retaining rings is in this case preferably exchanged for a position ring.
  • a package of PTC heating element, two electrical connection elements, a surrounding position ring and each one above and below applied insulating film therefore offers the greatest possible protection against moisture or dirt entering the live parts of the electric heating module.
  • the position ring is provided with insulating webs for the electrical connection elements, it also ensures that the led out of the position ring parts of the electrical connection elements can not be pressed unintentionally against the respective other contact surface of the retaining rings, which could possibly form a short circuit.
  • a second fundamental alternative to further develop the present invention is that the retaining ring is bisected at an axially extending parting plane, wherein the PTC heating element is seated in the parting plane between the two retaining ring parts.
  • the PTC heating element is arranged with its broad sides along the air flow; if it were in the air stream, this would therefore hit a narrow side of the PTC heating element.
  • the retaining ring in the sense of the present invention does not have to be a ring in the conventional sense, but can also consist of two or more individual parts as well as having very different shapes.
  • Each half of the retaining ring of this second basic alternative may have a contact surface adjoining the parting plane, against which the PTC heating element bears heat-conducting and electrically contacting.
  • the PTC heating element is then inserted between the two halves of the retaining ring, wherein preferably a seal or a frame for receiving the PTC heating element is present. This frame prevents excessive forces from acting on the PTC heating element and seals it to the outside.
  • the two halves of the retaining ring are assembled by means of clips, in particular spring clips. This results in a contact pressure between the retaining ring halves and the PTC heating element, which improves the electrical contact and in particular the heat transfer.
  • two (or more) radial gaps between the slats may be provided in the heat dissipation area to respectively receive a holding web and optionally perform an electrical conductor.
  • This will be a particularly simple and machine allows to bewerkstelligende mounting of the electric heating module according to the invention. Because then the retaining rings with the attached slats need only be placed on the holding webs, which automatically align themselves axially to each other. The retaining webs must then be closed only at the top and bottom, with a spring element for a bias of the retaining rings against the PTC heating elements provides.
  • a substantially U-shaped bracket is provided with at least two retaining webs as U-legs, wherein at the U-back of the holder, a spring element is mounted, that the retaining rings are inserted with lamellae in the U-shaped holder, and that a clip is placed on the ends of the retaining webs, which fixes the retaining rings and biases against the spring element.
  • the spring element on the U-back of the holder can be omitted, while the clip is replaced by a Federklam- mer or a spring clip.
  • the holding webs can be connected to each other by means of snap fasteners, resulting in not only a U-shaped holder, but in the result can result in an annular holder.
  • the snap fastening is preferably carried out via at least one centering element for receiving a spring element, so that in turn results in a U-shaped holder. If two centering elements are used, the result is an annular holder which can be snap-fitted.
  • At least one holding web is provided with feedthroughs for the electrical connection elements, so that these, without contacting the disk packs, are guided outward from the holding rings through the holding web and there by means of cables, plugs and the like can be connected from outside.
  • This is particularly important when using a heating module according to the invention in motor vehicles, since there the on-board voltage is limited and correspondingly high currents and thus correspondingly high cable cross-sections of the electrical connection elements must be given to ensure the desired heat output of the heating module.
  • the holding webs are attached to an air-permeable housing, or integrated into this, while a fan is attached to the housing or inserted into this.
  • the housing may be provided, moreover, in particular for insertion into a seat.
  • the electric heating module according to the present invention when it is used as a fan in a ventilated seat, in particular in a ventilated vehicle seat, wherein, if necessary, the air flow heating enabled by the PTC heating element and the heat-conducting fins as seat heating if necessary, can be switched in stages.
  • FIG. 1 is an exploded perspective view of a first embodiment of the heating module according to the invention
  • FIG. 2 shows the heating module from FIG. 1 in the preassembled state
  • FIG. 3 shows the heating module from FIG. 1 in the fully assembled state
  • Figure 4 is another perspective view of the heating module of Figure 3;
  • Figure 5 is an exploded perspective view of a second embodiment of the electric heating module according to the invention.
  • Figure 6 is an exploded perspective view of a third embodiment of the electric heating module according to the invention.
  • Figure 7 is an exploded perspective view of a fourth embodiment of the electric heating module according to the invention.
  • Figure 8 is an exploded perspective view of a fifth embodiment of the electric heating module according to the invention.
  • FIG. 9 shows the heating module from FIG. 8 in the assembled state
  • Figure 10 is an exploded perspective view of a portion of the heating module of Figure 1;
  • Figure 1 1 is an exploded perspective view corresponding to Figure 1, but of a further embodiment
  • Figure 1 1 a is a perspective view of a part of Figure 1 1 in the assembled state
  • Figure 12 is a perspective exploded view of another embodiment of a heating module according to the invention without housing;
  • Figure 1 3 is a perspective view of the electric heating module of Figure 12 from above, in assembled condition
  • Figure 14 is a perspective view of the electric heating module of Figure 12 from below, in the assembled state.
  • the electrical heating module according to a first embodiment of the present invention shown in Figure 1 in an exploded perspective view consists in its core of two retaining rings 1, 1 'with a circumferential, cylindrical groove 2 (see Figure 10), in the radially arranged, heat-conducting Slats 3, 3 'sit, one between the two retaining rings 1, 1' arranged PTC heating element 4 in the form of a round disc, surrounding the PTC heating element 4 soft elastic seal 5, two electrical connection elements 6, 6 ', which are designed as cable lugs are, designed as a corrugated compression spring spring element 7 and two respective two-part holding webs 8, 8 ', the U-legs of a U-shaped holder tion 9 9, which is integrated into a housing 10 and completed by means of a clip 1 1 becomes.
  • the housing 10 is broken in the present representation to make the inner parts, in particular the U-shaped holder 9 visible. It is essentially cylindrically shaped in order to form a tube for as laminar a flow of air as possible, which is supported on the input side by air guide webs 12.
  • a receptacle for inserting a fan 15 is formed in the housing 10 by a projection 13 and insertion grooves 14, 14 ', which draws the air flow through the heat discharge areas 16 formed by the laminar rings 3, 3'.
  • a nose 17 the fan is inserted into the insertion groove 14 in the housing 10.
  • the housing 10 is also provided with mounting pads 18 for insertion into a vehicle seat.
  • FIGS. 1 and 2 the machine mountability of the present exemplary embodiment of an electric heating module according to the invention becomes clear.
  • the spring element 7 is placed on a built-in housing 10 and part of the U-back of the holder 9 forming spring seat 19, the spring element 7 is placed.
  • the connecting elements 6 and 6 ' are each fitted into an open interior 20 of the retaining rings 1, 1' and the cable shoe is passed through an opening 21 in the retaining rings 1, 1 ', where after then the lower retaining ring 1 'with its slats 3' and emgepasstem electrical connection element 6 'is placed on the spring element 7, wherein the retaining webs 8 by two opposite gaps 22' in the heat output area 16 or in the slats 3 'reach through and the retaining ring Aligning in its radial position on a on the retaining ring 1 'arranged, radially extending contact surface 23' is then embedded in the soft elastic seal 5 PTC heating element 4 then the upper retaining ring 1 is oriented opposite to the embedded in the seal 5 PTC -Heizelement 4, wherein also the retaining ring 1 has a contact surface 23, the PTC heating element 4 electrically and thermally conductive Kontak- also by Lucken 22 in the blades 3 of the upper retaining ring 1 engage the holding webs 8,
  • the clamp 11 can be attached to the holder 9 or the holding webs 8, 8' in that it latches under the projections there, the retaining rings 1 must be prestressed against the spring force of the spring element 7.
  • the clip 11 holds this preload and thus causes excellent heat transfer and low electrical resistance between the PTC heating element 4 and the two contact surfaces 23.
  • the soft elastic seal 5 has a cross section which thickened radially outwards, so that tilting of the retaining rings 1, 1 'against each other, which could cause a short circuit, is excluded at the same time ensures the seal 5 for it in that the PTC heating element 4 and the contact surfaces 23, 23 'are protected against moisture and dirt It should be noted at this point that the clip 1 1 can also be exchanged for a spring clip or a spring ball, whereby the spring element 7 is unnecessary and Bauhohe saved.
  • the fan 15 is inserted into the housing 10
  • the mounting webs 18 or mounting flanges allow easy maintenance in motor vehicle seats.
  • the Einstecknuten 14 in the housing 10 serve on the one hand for guiding and preventing rotation of the fan 15 in the housing 10 by means of the nose 17; on the opposite side of the insertion groove 14 'is used to carry out the necessary for the fan 15 and the PTC heating element 4 electrical connection cable.
  • the aluminum extruded part used in the exemplary embodiment according to FIGS. 1 to 4 as a retaining ring 1, 1 ' has a double-T-shape in lateral view, but only one of the two T-surfaces is in the form of a disk, and is formed as a contact surface 23, while the opposite side of the retaining ring 1 is open in order to accommodate the connecting element 6 can.
  • the groove 2 is formed by two edge webs 24, wherein the one edge web 24 'is the outer periphery of the contact surface 23'.
  • the heat-conducting lamellae 3, 3 ' are each formed from two aluminum sheet strips which form a meandering shape in each case to form two lamellar ring pieces bent and folded over the annular surface in half overlapping manner so that the gaps 22, 22' can be left standing therebetween.
  • the heat dissipation region 16 may also be composed of a plurality of individual lamella ring pieces.
  • the lamellae 3 are seated in their radially inner region in the groove 2 of the retaining ring 1, wherein the groove 2 in its width corresponds exactly to the width of the sheet metal strips, so that they can be inserted axially and radially aligned in the groove 2. Pressing or caulking of the edge webs 24 of the retaining ring 1 inwardly against the slats 3 causes a deformation of the groove side walls, so that the lamella narrow sides impress in the groove side walls due to the increased stability of the fins by the radially inner folding and an intimate , enter thermally conductive connection with the retaining ring 1.
  • the lamellae 3 are crescent-shaped in their radial course, which takes into account the fact that the fan 15 generates an almost turbulence-free air flow in its intake region, but not with exactly axial flow vectors .
  • the embodiment shown in FIG. 7 again has meandering fins 3, 3 ', which however are not aligned axially in such a way that their broad sides extend exactly in the axial direction, but they are slightly tilted against this axial direction, so that the axial air flow is also on a projection of the broadsides hits. Accordingly, the slats 3, 3 'in the tilted state in the groove 2 of the retaining ring 1 caulked.
  • the slats 3 can also sit vertically in the groove 2, as is the case in the two previous embodiments, and the slats 3 are then twisted, so twisted about a radial axis to the to produce tilting of the slats 3 in the heat dissipation region 16 shown in Figure 7.
  • FIG. 5 shows an exemplary embodiment of an electric heating module according to the invention, which essentially corresponds to the exemplary embodiment illustrated in FIGS. 1 to 4.
  • FIGS. 1 to 4 here are three retaining rings 1, 1 ', 1 "with respective slats 3, 3', 3" arranged one above the other, and between each two retaining rings 1, 1 ', 1 "is in each case a PTC heating element 4, 4' in the reference Figure 1 arranged manner, and in a seal 5, 5 ' embedded.
  • the two PTC heating elements 4, 4 'thus act on a common Lamellenpaktet 3' and in addition to their own disc pack 3 or 3 ".
  • the electrical contact can be limited to three connection elements 6, 6 ', 6 ", since here two PTC heating elements 4, 4' share a common electrical connection 6 '.
  • the arrangement shown in Figure 5 allows a gradual connection of electrical heating energy in the air flow generated by the fan 15, wherein in the present case two stages can be switched. As far as a correspondingly larger number of retaining rings 1 is stacked with disk packs 3 on top of each other, several stages of switchable heating power can be realized. If no PTC heating element 4, 4 'is connected to electrical current, the electric heating module according to the invention operates as a fan for ventilating a vehicle seat. A correspondingly weak first heating level, for example, would allow a tempered ventilation of a vehicle seat without heating it in the subjective sensation of the person sitting on it.
  • FIGS. 8 and 9 show a further exemplary embodiment of an electrical heating module according to the invention, which in turn can be inserted into a housing with a fan, which is not shown here, however.
  • This further embodiment realizes an alternative embodiment of a retaining ring 1 according to the invention, since this is divided into two halves 25, 25 ', which are separated from each other. In the parting plane between the two halves 25, 25 ', each half of the retaining ring 1 is provided with an axially extending contact surface 23, 23', so that the PTC heating element 4 axially instead of radially aligned between the contact surfaces 23, 23 'sits and of these thermally conductive and electrically contacted.
  • a holding frame 26 made of plastic ensures an exact alignment of the PTC heating element 4 and the two halves 25, 25 'of the retaining ring 1 to each other, while two spring clips 27, the two halves 25, 25' of the retaining ring 1 together.
  • the retaining clips 27 are each one-sided with a Insulated 28 insulation, so that each spring clip 27 each only one half 25, 25 'of the retaining ring 1 electrically contacted
  • the retaining ring 1 is in principle constructed in the same way as in the exemplary embodiment illustrated in FIGS. 8 and 9, because it consists of an aluminum component produced as extruded part with each circumferential upper and lower edge webs 24 to form an outer circumferential, cylindrical groove 2 in this groove 2 sit made of a maanderformig bent aluminum sheet slats 3, which are pressed there by caulking the edge webs 24
  • FIGS. 8 and 9 permit a lower structural height and may accordingly be advantageous.
  • the heat output delivered will generally not be as high as in the other embodiments described.
  • FIG. 11 again shows, similar to FIG. 1, an electrical heating module in a perspective exploded view.
  • This is a further exemplary embodiment of the present invention, wherein the modifications with respect to the module shown in FIG. 1 essentially relate to the electrical contacting, because the electrical Connection elements 6, 6 'are here in each case between the PTC heating element 4 and the contact surfaces 23, 23' of the retaining rings 1, 1 'arranged
  • the heating module shown in Figure 1 1 consists of two retaining rings 1, 1' with a circumferential, cylindrical groove, in the arranged, heat-conducting fins 3, 3 'sitting, a arranged between the two retaining rings 1, 1' PTC heating element 4 in the form of a round disc, a surrounding the PTC heating element 4 position ring 35 made of plastic and two electrical connection elements 6, 6 ' , which are designed as cable shoes.
  • the arrangement of the electrical connection elements 6, 6 'in the heating module shown in FIG. 11 differs, as mentioned, from the heating modules illustrated in the preceding figures in that the electrical connection elements 6, 6' respectively rest directly on the PTC heating element 4, and the position ring 35.
  • the latter is relatively wide in order to accommodate the package formed by the two electrical connection elements 6, 6 'and the PTC heating element 4 as a whole, but it has slightly less height than this package to a high contact pressure and thus a good heat transfer between the PTC heating element 4 and the two retaining rings 1, 1 'not to be affected.
  • the electrical connection elements 6, 6 ' are each separated by means of a thermally conductive, but electrically insulating insulating film 30, 30'.
  • This insulating film 30, 30 ' is preferably a thermostable polyamide film and is designed to be particularly easy to install on one side self-adhesive. Between the surfaces of the PTC heating element 4 and the retaining rings 1, 1 'are thus in each case an electrical connection element 6 and an insulating film 30.
  • the resulting advantage is that neither the retaining rings 1, 1' nor the heat-conducting fins third 3 'are live; since they are therefore at the same electrical potential, a short circuit between the lamellae 3 of the first retaining ring 1 and the lamellae 3 'of the second retaining ring 1' is excluded even if moisture or dirt penetrates into the electrical heating module or accidentally electrically leading part, such as a nail, enters the air flow.
  • This insulating webs 32 ensure that even if in the electrical connection elements 6, 6 'a (not shown) connecting cable is inserted with unacceptably high force, no unintentional contact between the electrical connection element 6 with the contact surface 23' of the retaining ring 1 ', or conversely, a contact of the electrical connection element 6 'with the contact surface 23 of the retaining ring 1 results and thus would result in a short circuit.
  • Figures 12 to 14 show an embodiment of an electric heating module according to the present invention, which is manufactured without housing and can be used, for example, in a ventilation pipe, for example. It has four retaining rings 1, 1 ', 1 ", 1'” with heat-conducting fins 3, 3 ', 3 ", 3'", which, however, receive only two PTC heating elements 4, 4 'between them. Each of the two PTC heating elements 4, 4 'acts on two lamella packages 3, 3' and 3 ", 3 '". They can be designed identically or provided with different power consumption.
  • FIG. 12 shows in more detail the structure of this exemplary embodiment of an electrical heating module
  • FIGS. 13 and 14 illustrate the heating module in the assembled state, from a perspective from above (FIG. 13) and a perspective from below (FIG. 14).
  • a lower centering element 33 ' to which a right 8 and a left holding web 8' are snapped, carries a spring element 7 and receives the open inner space 20 '"of the lowermost retaining ring 1'" centering.
  • On the back of the lowermost retaining ring 1 '" thus on its contact surface 23'" is the first PTC heating element 4 ', which is embedded in a first soft-elastic seal 5'.
  • an upper centering element 33 forms a spring element 7 received by the latter and a upper retaining ring 1 together with the second PTC heating element 4, the seal 5 and the second uppermost retaining ring 1 'an assembly with plate packs 3, 3' to the upper PTC heating element 4th
  • a special feature that distinguishes the exemplary embodiment according to FIGS. 12, 13 and 14 from the exemplary embodiments of the preceding figures relates to the electrical connection elements 6, 6 ', 6 ": instead of cable lugs, contact plugs are used here, which are penetrated by the gaps 22, 22', 22 “, 22 '” pass through and in the open interior 20, 20 “, 20'” of the retaining rings 1, 1 ', 1 ", 1'” are mounted contacting '"in each case a centering piece 36, 36" on which the electrical connection elements 6, 6', 6 "are placed.
  • the two PTC heating elements 4, 4 'common, central electrical connection element 6' is in this case designed such that it on the one hand on the centering pieces 36 ', 36 "of both associated retaining rings 1', 1" is seated to contact them, and on the other hand, an axial guide for these two centering 36 ', 36 "forms what the stability of the entire electric heating module - yes without go use gets along - increased.

Abstract

La présente invention concerne un module chauffant électrique conçu pour réchauffer un flux d'air, en particulier pour chauffer et ventiler des sièges. Ce module comprend au moins un élément chauffant à coefficient de température positif (CTP) et au moins un région annulaire d'émission de chaleur qui est adjacente à l'élément chauffant et à travers laquelle de l'air peut passer. Cette région d'émission de chaleur comporte des lamelles thermoconductrices sensiblement radiales qui coopèrent avec l'élément chauffant à coefficient de température positif et qui constituent un module avec cet élément. Cette invention est caractérisée en ce que les lamelles reposent avec leur section radialement interne dans une encoche d'une bague de support thermoconductrice, laquelle encoche est adaptée à la largeur de la section radialement interne des lamelles.
EP08707462A 2007-02-02 2008-01-31 Module chauffant électrique conçu pour réchauffer un flux d'air, en particulier pour chauffer et ventiler des sièges Withdrawn EP2118579A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007006058A DE102007006058B4 (de) 2007-02-02 2007-02-02 Elektrisches Heizmodul zur Luftstromerwärmung, insbesondere zur Heizung und Belüftung von Sitzen
PCT/EP2008/000775 WO2008092694A1 (fr) 2007-02-02 2008-01-31 Module chauffant électrique conçu pour réchauffer un flux d'air, en particulier pour chauffer et ventiler des sièges

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EP2118579A1 true EP2118579A1 (fr) 2009-11-18

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US (1) US20100072186A1 (fr)
EP (1) EP2118579A1 (fr)
CA (1) CA2677285A1 (fr)
DE (1) DE102007006058B4 (fr)
WO (1) WO2008092694A1 (fr)

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Also Published As

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US20100072186A1 (en) 2010-03-25
DE102007006058A1 (de) 2008-08-07
DE102007006058B4 (de) 2009-11-26
WO2008092694A1 (fr) 2008-08-07
CA2677285A1 (fr) 2008-08-07

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