EP2019268A2 - Electric heater - Google Patents
Electric heater Download PDFInfo
- Publication number
- EP2019268A2 EP2019268A2 EP08000980A EP08000980A EP2019268A2 EP 2019268 A2 EP2019268 A2 EP 2019268A2 EP 08000980 A EP08000980 A EP 08000980A EP 08000980 A EP08000980 A EP 08000980A EP 2019268 A2 EP2019268 A2 EP 2019268A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet metal
- housing
- spring
- heater according
- metal piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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
- F24H3/0441—Interfaces between the electrodes of a resistive heating element and the power supply means
-
- 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
- F24H3/0441—Interfaces between the electrodes of a resistive heating element and the power supply means
- F24H3/0447—Forms of the electrode terminals, e.g. tongues or clips
-
- 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
- F24H3/0464—Two-piece frames, e.g. two-shell frames, also including frames as a central body with two covers
-
- 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
- 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
-
- 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
Definitions
- the present invention relates to an electric heater with the preamble features of claim 1.
- Such a heater is for example from the EP 0 350 528 or the EP 1 564 503 known.
- the conductor tracks for energizing the PTC heating elements are formed by metal strips, of which selected sheet metal strips are led out laterally from the housing, which is usually formed as a flat, provided substantially with the thickness of the layer structure frame. These over the peripheral edge of the frame laterally led out sheet metal bands form there contact tongues for connecting the electric heater to the power supply. This connection can also take place with the interposition of a plugged onto the contact tongues control or regulation element.
- the present invention is based on the problem to provide an electric heater that meets the above-mentioned, partially conflicting requirements for economic production on the one hand and a good and reliable plug connection to the electric heater on the other hand.
- the electric heater according to the invention differs from the generic state of the art in that the contact tongues are formed by stamped sheet metal pieces that are electrically selected Interconnects are connected.
- the sheet metal strip which has been led out over the housing directly laterally to form contact tongues, ends within the housing, whereas the contact tongues projecting beyond the housing are formed by a separate component, namely a stamped piece of sheet metal which is connected to the conductor tracks in FIG the rule is electrically connected within the housing.
- different material thicknesses for the conductor tracks on the one hand and the stamped sheet metal piece can be selected on the other hand to allow the simplest possible plugging a mating connector to the reeds without having to use too thick metal strips or the like as traces for the energization of the PTC heating elements.
- the stamped piece of sheet metal and the selected track can in principle be connected to each other by various techniques. So it is possible to connect both components by welding or soldering. Also, an adhesive connection is conceivable.
- the sheet metal piece and the conductor track which is particularly preferably formed in the form of a sheet-metal strip, provided parallel to each other and have a overlapping length portion at which the stamped sheet metal piece is parallel to the associated conductor track and rests against this.
- the overlapping length section should be chosen so that a secure contact of the adjacent components is achieved.
- the sheet metal piece at least one, preferably a plurality of projections, which are particularly preferably formed by means of stamping on the sheet metal piece.
- Corresponding projections can alternatively also be provided exclusively on the metal strip forming the conductor track. Equally well corresponding projections can be provided both on the sheet metal strip and the piece of sheet metal. The projections serve for the specific electrical contacting of the two components in the overlapping length range. On these projections alone, an electrical contact between sheet metal strip and contact tongue should be done. This ensures that the current is introduced from the contact tongue in the conductor in a defined manner.
- the spring element establishes a frictional connection of the two components, preferably, provided that these overlapping longitudinal sections have, by pressing the two components against each other.
- the spring element can also be used to hold the sheet metal piece to the housing. This holder can be done directly by interaction of the spring element with the housing or housing parts. The spring element, for example, clamp the sheet metal piece with the interposition of corresponding walls of the housing and thus set against the housing.
- the spring element can also be provided in a housing designed specifically for receiving the spring element, which is referred to below as a spring receptacle and which is designed such that it holds the spring element with little play.
- the spring receptacle accordingly forms stops, against which the spring abuts in the event of a possible relative movement of the contact tongue inserted into the housing in order to limit this relative movement.
- the housing comprises a housing lower part, which is substantially cup-shaped and the layer structure at least partially circumferentially sums, so that the layer structure can be positioned in a predetermined manner by inserting into the housing base.
- the lower housing part is formed so that this in cooperation with the contours of the spring element in the installed position thereof substantially prevents mobility in the longitudinal direction of the layers of the layer structure.
- the aforementioned spring receptacle is formed by the lower housing part.
- the spring element is formed in the form of a spring clip whose opposite spring legs clamp in the installed position of the spring element between the conductor track and the piece of sheet metal.
- a respective spring clip is provided for each contact tongue, the spring force alone cause the mutual concern of conductor track and piece of sheet metal.
- the conductor track and the piece of sheet metal clamping spring clip is proposed according to a further preferred embodiment of the present invention that on both sides of the sheet piece and / or the conductor projections are formed and that at least one of the spring legs between two projections on the sheet metal piece or the conductor is present.
- the projections which may preferably be provided in opposite parallel rows, accordingly form elevations between them a contact surface of the spring leg on the sheet metal piece or the conductor track and prevent the spring clip from slipping in a direction substantially perpendicular to the longitudinal extension of the conductor track.
- the spring clip preferably forms mutually opposite convexly curved projections which abut against the piece of sheet metal or on the conductor track and with a certain distance pass through the projections provided on the piece of sheet metal and / or the conductor track.
- the spring legs should rest with their convex curved projections securely between the opposite, preferably formed by punching projections on the sheet metal piece or the conductor track.
- the lower housing part forms the spring seat, in such a way that it opens in Einlegecardi the elements of the layer structure.
- the overlapping length section is also located in this preferred embodiment, the overlapping length section.
- this overlapping longitudinal section is essentially limited to the extension of the spring receiver.
- the spring retainers For positioning of the selected conductor track or the piece of sheet metal before the finished assembly of all components of the electric heater, in particular before attaching the spring clip, it is preferable to provide the spring retainers with slots opening in the longitudinal direction of the layers of the layer structure, for receiving the sheet metal piece and / or the conductor track are shaped appropriately.
- the slots are preferably dimensioned so that the conductor track, but in particular the sheet metal piece is aligned parallel to the planes of the layer structure. Accordingly, a pushed in the insertion direction over the conductor track and the piece of sheet metal spring clip grip both parts safely and create under bias against each other.
- the spring clip has for this purpose at its front region preferably a slightly funnel-shaped and formed by the two spring leg insertion hole.
- the maximum penetration depth of the sheet metal piece into the housing by the embodiment at least one of the slots limited.
- the slot provided between the spring receptacle and the layer structure forms a stop for the piece of sheet metal, which prevents it from penetrating deeper in the direction of the layer structure, so that even when the contact tongues are subjected to an impact, they are not displaced into the housing and there Cause short circuit.
- the sheet metal piece forms at its, the housing superior end of a slip-on.
- This is characterized in that it has functional surfaces which are specially adapted to contact surfaces of a plug-in element to be attached to the contact tongues.
- the corresponding functional surface differs in particular from the design and especially the dimension of the sheet metal piece in the region of the overlapping longitudinal section.
- the sheet metal piece is held by means of positive engagement in the longitudinal direction of the layers of the layer structure on the housing.
- an opening groove is preferably provided on a side surface of the sheet metal piece, between the Aufsteckabêt and the overlapping longitudinal portion of the sheet metal piece. In this groove engages a formed by the housing projection, which holds the piece of sheet metal with little or almost no play.
- the overlapping longitudinal portion of the conductor preferably ends in front of the groove, d. h., The track does not extend beyond the groove to the outside.
- the protrusion engaging in the groove is part of an edge which circumferentially surrounds the housing, d. h., The projection is provided substantially on the outer surface of the housing, it is ensured that the conductor track is completely received within the housing and only the sheet metal piece projects beyond the housing.
- the spring receptacles to form a plurality of contact tongues so that they project beyond an edge of the housing base.
- This edge is an edge which is usually parallel to the upper or lower side of the housing through which the air flows and against which the lid-shaped upper housing part rests when the cover is closed.
- said edge is bounded on the outside by the circumferential in the circumferential direction of the housing edge of the housing.
- the circumferentially circumferential edge of the housing extends substantially perpendicular to the edge, which is surmounted by the spring receivers. In this embodiment, therefore, the spring retainers project in the direction of the upper housing part.
- the Fig. 1 shows a perspective side view of an embodiment of the electric heater with a housing 2, consisting of a lower housing part 4 and an upper housing part 6. Both housing parts 4 and 6 are positively connected to each other and take up in a heating block, which arranged from a plurality of parallel layers to each other heat-generating elements 10 and heat-emitting elements 12 consists.
- the heat-emitting elements 12 are formed as corrugated rib elements of meandering bent sheet metal strip.
- contact tongues 14 are arranged one above the other in the transverse direction.
- the contact tongues pass through recesses 15 which are recessed on the housing 2 and each receive a contact tongue 14 for themselves and are predominantly formed by the housing lower part 4, but are completed on one end side by the housing upper part 6.
- the housing 2 has two opposite frame openings, of which in Fig. 1 only the frame opening 16 formed by the upper housing part 6 can be seen.
- the frame opening formed by the lower housing part 4 is in Fig. 4 to recognize and with reference numerals 18 marked.
- the frame openings 16, 18 are each interspersed with struts 20 which extend at right angles to the layers of the heating block 8 and connect the opposing longitudinal beams of the lower housing part 4 and upper housing part 8 with each other.
- the Fig. 2 shows details of the heating block 8 and its inclusion in particular in the lower housing part 4 and shows the lower housing part 4 in a plan view with the housing upper part removed.
- the heat-emitting elements 12 are only incompletely shown at the respective front ends of the housing lower part 4. Accordingly, the illustration in Fig. 2 also a view of the frame opening 18 formed by the lower housing part 4 free.
- the exemplary embodiment shown has four heat-generating elements 10, which are each accommodated in the housing lower part 4 in an insulating manner and with a certain mobility transverse to the layers of the layer structure (heating block 8).
- the lower housing part 4 has for this purpose fitting element receptacles 22 which open a receptacle 24, which is formed essentially by the housing lower part 4 and accommodates the heating block 8.
- fitting element receptacles 22a, 22b are provided in the exemplary embodiment shown (cf. Fig. 3 ).
- the heat-generating elements 10 have at their front ends fitting elements 26a, 26b which respectively fit only in the corresponding corresponding fitting element receptacle 22a or 22b.
- the corresponding fitting element receptacles 22 are matched to the fitting elements 26 provided corresponding thereto, that the heat-generating elements 10 are movable by a few tenths of a millimeter transversely to the longitudinal extent of the layers of the heating block 8 in the housing 2.
- the outer fitting elements 26a are designed as a hammer head and engage in correspondingly formed fitting element receptacles 22a.
- the fitting elements 26b associated with these elongated fitting element receptacles 22b are rod-shaped and less wide than the hammer-head-like fitting elements 26a. Due to this particular configuration, the central heat-generating elements 10 do not fit in the outer positions for heat-generating elements 10 of the heating block. In appropriate Way, the outer heat-generating elements can not be arranged in the middle of the heating block, ie insert into the housing 2.
- the heat-generating elements 10 can not be used anywhere in the housing 2, the heat-emitting corrugated fin elements 12 are nonspecific and as lengths of a meandering curved first sheet metal strip as manufactured and cut from this continuous material to length. Each individual heat-emitting element 12 can be used at any position for a heat-emitting element within the heating block 8.
- the fitting elements 26 are integrally formed on a positioning frame 28, which in the 6 and 7 can be seen and explained in more detail below with reference to these figures.
- the positioning frame 28 is made of an insulating material and serves for the positioning of PTC heating elements 30.
- a receptacle 32 in the positioning frame 28 is recessed for each individual PTC heating element 30, which surrounds this PTC heating element and thus defines it.
- sheet metal strips 34, 36 which form electrical conductors for energizing the PTC heating elements 30 and via which the heat generated by the PTC heating elements to the heat-emitting elements 12 is passed by heat transfer. These lie directly on the metal bands 34, 36 at.
- the front ends of the positioning frame 28 are extended over a fitting element web 38 on the position of the metal strips 34, 36 addition.
- the respective fitting elements 26 of the positioning frame 28 At the outer end of the fitting element webs 38 are the respective fitting elements 26 of the positioning frame 28.
- the vast extent of the position frame 28 in the width direction of the respective metal bands 34, 36 is taken.
- the positioning frame on holding webs 40 which are provided immediately adjacent to the lateral edge of the metal strips 34, 36 and the corresponding metal strips 34, 36 project beyond the top and these overlap on the outside, preferably with the tracks 34, 36 in contact and abut this.
- the holding webs 40 are in the embodiment shown in one piece by way of injection molding initially as perpendicular to the main extension direction of the position frame 28th outgoing projections formed.
- the distance of opposing projections is selected so that the sheet metal strip 34 or 36 just fits between these projections.
- the one-piece component thus produced by injection molding is then provided with the essential parts of the heat-generating element 10, i. the PTC heating elements 30 are inserted into the corresponding receptacle 32 and surrounded on both sides by the metal strips 34, 36. Thereafter, the projections are plastically deformed inwardly and so the interconnects 34, 36 formed across.
- the heat-generating element 10 is formed as a preassembled component and can thus be handled during assembly, without the risk that the conductor tracks 34, 36 or even the inserted in the position frame 28 PTC heating elements 30 are lost. It should be noted, however, that usually the holding webs fix only the metal strips 34, 36 in the position frame, but not with a contact force against the PTC heating elements 30 set, which is sufficient to energize the PTC heating elements 30 during operation safe. This is in any case effected in the embodiment discussed in the present invention by a spring element which is inserted into the housing 2 and sets the entire layer structure consisting of heat-generating elements 10 and heat-emitting elements 12 under tension.
- Fig. 3 and 6 are a metal strip, namely in Fig. 6 shown sheet metal strip 34, bent out of the plane of the heat generating element 10. Accordingly, an offset 42 results between the plane in which the sheet metal strip 34 abuts against the PTC heating elements 30, and a free end 44, which by repeated, but opposite bending extends parallel to the first-mentioned main portion of the sheet metal strip 34. Again Fig. 3 can be seen, this free end 44 is mechanically and electrically connected by a crimp 46 to the associated contact tongue 14.
- upper heat-emitting elements have an outgoing from the upper sheet metal strip 34 offset 42.3 and 42.4.
- the lower heat generating element 10.1 has a downwardly outgoing offset 42.1.
- the metal strips 34, 36 of the heat generating element 10 marked with reference numeral 10.2 are on both sides to form an offset 42.20 or 42.21 arc and each provided with a contact tongue 14. Based on these Differences it is possible to avoid a swapping of the positions for the heat generating elements 10.3 and 10.2 within the housing 2.
- the embodiment allows that the two middle heat-generating elements 10.2 and 10.3 can be interchanged with one another due to the design of contact tongue receivers 48. A corresponding interchangeability is also given for the two outer heat-generating elements 10.1 and 10.4.
- slits 15 go from the outside of the housing 2 and terminate in the opposite to the slots 15 each widened spring receptacles 48. Behind this spring receptacle 48 in turn a narrowed slot 50 is formed, which is a contact tongue 14 formed by punching sheet metal piece 120 and the free end 44 of the associated sheet metal strip 34 receives.
- the Fig. 8 illustrates the connection between a heat-emitting element 10 with the Bleck choir 120.
- a spring clip 46 is provided, the opposite spring legs 47 clamp the sheet metal piece 120 and the free end 44 of the sheet metal strip 34 between them.
- the free end of the sheet metal strip 34 and the sheet metal piece 120 each have a covering length portion 122 in which the two elements 120, 44 lie parallel to each other and to each other.
- projections 124 are formed in the overlapping length region 122 by punching on the sheet metal piece 120, via which only the electrical contact between the free end 44 and the sheet metal piece 120 takes place.
- the planar region of the sheet metal piece 120 in the overlapping longitudinal portion 122 is then provided at a distance from the free end 44 of the sheet metal strip 34 extending parallel thereto.
- the sheet metal piece 120 has two parallel extending rows of projections 124. By punching these projections 124 are formed on both sides of the sheet metal piece 120 so that the piece of sheet metal can be applied in any orientation parallel to the sheet metal strip 34 at the free end 44, without that the desired defined electrical contact between the two elements 34, 120 is lost. Between the overlapping length portion 122 and a Aufsteckabêt 140, which is formed by the front end of the sheet metal piece 120 which projects beyond the housing 2, laterally opposite grooves 126 are recessed.
- the sheet metal piece 120 ends conically to facilitate the attachment of a female plug, not shown, on the contact tongue 14.
- the overlapping longitudinal portion 122 has a greater width than the Aufsteckabêt 140. This greater width is initially behind the groove 126, so that a defined stop 142 is formed by the sheet metal piece 142 for the plug element.
- This in Fig. 10 spring element shown in detail in the form of a spring clip 46 has the two already mentioned spring legs 47, which are connected to one another via a web 134.
- the spring legs 47 have curved projections 130 which form opposing convexly curved abutment surfaces 132.
- the spring clip 46 cooperates with the free end 44 of the sheet metal strip 34 and the sheet metal piece 120 in an installed position.
- an insertion opening 144 with a large opening cross section receives the two parts 134, 120 in itself.
- the convex abutment surfaces 142 on the one hand slide on the sheet metal piece 120 and on the other hand on the free end 44 of the sheet metal strip 34, widening the spring clip 46.
- the convex abutment surfaces pass the first row of protrusions 124 and spring between the two rows of protrusions 124. The end of this insertion movement is in any case achieved when the inner surface of the web 134 abuts against the end face of the sheet metal piece 122 and the sheet metal strip 34.
- the assembly described above is carried out after the layer structure consisting of heat-generating elements 10 and heat-emitting elements 12 has been introduced into the lower housing part 4 (see. Fig. 9 ). Thereafter, the free ends of selected metal strips 34, which serve to contact the heating block in the housing 2, within the spring receptacles 48 are free. In this case, the free ends 44 pass through the slot 50, but ends in front of the slot 15. In the insertion direction of the layer structure, the sheet metal pieces 120 are introduced into the respective slots 15, in such a way that formed on the peripheral edge of the housing base projection 128 in the Groove 126 engages. This position is in Fig. 9 shown.
- Sheet metal piece 120 extends in the longitudinal direction, that is, in the extension direction of the layers of the layer structure into the rear slot 50 and passes through the front slot 15, as the FIG. 3 can be seen. Thereafter, the spring clip 46 is inserted from above into the spring receptacle 48. In particular Fig. 3 can be seen, the lower housing part 4 is formed such that the spring clip 46 is fixed with little play in the spring seat 48.
- the upper housing part 6 at the level of the slots 15 has a recess 36 which can receive the free end of a spring receptacle 48.
- This concrete embodiment of the upper housing part 6 is due to the fact that the spring receptacle 48 projects beyond an edge surrounding the layer structure, the bsp. the inner surface 63 of the longitudinal beams contains.
- the recess 36 of the upper housing part 6 is continued by a tapered recess 138, which, however, does not extend to the frame opening 16 of the upper housing part.
- the upright plate piece 120 fits with its front side.
- the closed end of the tapered recess 138 forms a stop for the piece of sheet metal 120th
- the electrical contact between the sheet metal piece 120 and the sheet metal strip 34 takes place solely on the clamping force of the spring clip 46.
- This is formed from a spring steel and causes a compressive stress of between 1000 and 1500N / mm 2 between the sheet metal piece 120 and the sheet metal strip 34.
- the smallest distance between the convex contact surfaces 132 is at most 40% of the cumulative thickness of the sheet metal piece 120 and sheet metal strip 34.
- the sheet metal piece 120 is formed of a good electrically conductive material, eg. a copper-tin alloy. At least the Aufsteckabêt 140, preferably the entire sheet metal piece 120 are in any case provided at their opposite side surfaces with a silver coating to effect the best possible contact on the one hand between the sheet metal piece 120 and the sheet metal strip 34 and on the other hand between the contact tongue 14 and the plugged connector element.
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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)
- Direct Air Heating By Heater Or Combustion Gas (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft einen elektrischen Zuheizer mit den oberbegrifflichen Merkmalen von Anspruch 1.The present invention relates to an electric heater with the preamble features of claim 1.
Ein derartiger Zuheizer ist beispielsweise aus der
Bei den gattungsgemäßen elektrischen Zuheizern, insbesondere bei einem Kraftfahrzeug zur Fahrgastinnenraumbeheizung, kommen relativ hohe Ströme zur Anwendung, die darin begründet liegen, dass wärmemäßige Leistungen von zwischen 2.000 und 3.000 Watt von dem elektrischen Zuheizer abgegeben werden müssen und das Bordnetz eines Kraftfahrzeuges üblicherweise mit 12 Volt betrieben wird. So muss die zur Kontaktierung des Steckerelementes dienende Oberfläche der Kontaktzunge eine gute Übertragung von elektrischem Strom gewährleisten. Aus wirtschaftlichen Gründen sollen aber die Leiterbahnen von einem Endlosband abgeschnitten und vorzugsweise ohne weitere Bearbeitung in das Gehäuse eingesetzt werden, und zwar unabhängig davon, ob die entsprechenden Leiterbahnen an der Außenseite Kontaktzungen ausbilden oder innerhalb des Gehäuses enden.In the generic electric auxiliary heaters, especially in a motor vehicle for passenger compartment heating, relatively high currents are used, which are due to the fact that heat outputs of between 2,000 and 3,000 watts must be delivered by the electric heater and the electrical system of a motor vehicle usually with 12 volts is operated. Thus, the serving for contacting the plug element surface of the contact tongue must ensure a good transmission of electric current. For economic reasons, however, the conductor tracks should be cut off from an endless belt and preferably inserted into the housing without further processing, regardless of whether the corresponding conductor tracks form contact tongues on the outside or end within the housing.
Der vorliegenden Erfindung liegt das Problem zugrunde, einen elektrischen Zuheizer bereitzustellen, der den oben angegebenen, teilweise widerstreitenden Anforderungen an eine wirtschaftliche Herstellung einerseits und eine gute und zuverlässige Steckverbindung an den elektrischen Zuheizer andererseits gerecht wird.The present invention is based on the problem to provide an electric heater that meets the above-mentioned, partially conflicting requirements for economic production on the one hand and a good and reliable plug connection to the electric heater on the other hand.
Zur Lösung dieses Problems wird mit der vorliegenden Erfindung ein elektrischer Zuheizer mit den Merkmalen von Anspruch 1 vorgeschlagen. Der erfindungsgemäße elektrische Zuheizer unterscheidet sich dadurch von dem gattungsbildenden Stand der Technik, dass die Kontaktzungen durch gestanzte Blechstücke gebildet sind, die elektrisch mit ausgewählten Leiterbahnen verbunden sind. Mit anderen Worten enden das im Stand der Technik zuvor seitlich zur Ausbildung von Kontaktzungen über das Gehäuse direkt hinausgeführte Blechband vorzugsweise innerhalb des Gehäuses, wohingegen die das Gehäuse überragenden Kontaktzungen von einem separaten Bauteil, nämlich jeweils einem gestanzten Blechstück gebildet werden, welches mit den Leiterbahnen in der Regel innerhalb des Gehäuses elektrisch verbunden ist. Dabei können unterschiedliche Materialstärken für die Leiterbahnen einerseits und das gestanzte Blechstück andererseits gewählt werden, um ein möglichst einfaches Anstecken eines Gegensteckers an die Kontaktzungen zu ermöglichen, ohne allzu dicke Blechbänder oder dergleichen als Leiterbahnen für die Bestromung der PTC-Heizelemente verwenden zu müssen.To solve this problem, the present invention proposes an electric heater having the features of claim 1. The electric heater according to the invention differs from the generic state of the art in that the contact tongues are formed by stamped sheet metal pieces that are electrically selected Interconnects are connected. In other words, in the prior art, the sheet metal strip, which has been led out over the housing directly laterally to form contact tongues, ends within the housing, whereas the contact tongues projecting beyond the housing are formed by a separate component, namely a stamped piece of sheet metal which is connected to the conductor tracks in FIG the rule is electrically connected within the housing. In this case, different material thicknesses for the conductor tracks on the one hand and the stamped sheet metal piece can be selected on the other hand to allow the simplest possible plugging a mating connector to the reeds without having to use too thick metal strips or the like as traces for the energization of the PTC heating elements.
Das gestanzte Blechstück und die ausgewählte Leiterbahn können grundsätzlich nach verschiedenen Techniken miteinander verbunden werden. So ist es möglich, beide Bauteile mittels Schweißen oder Löten zu verbinden. Auch ist eine Klebeverbindung denkbar.The stamped piece of sheet metal and the selected track can in principle be connected to each other by various techniques. So it is possible to connect both components by welding or soldering. Also, an adhesive connection is conceivable.
Vorzugsweise sind das Blechstück und die Leiterbahn, die besonders bevorzugt in Form eines Blechbandes gebildet wird, parallel zueinander vorgesehen und haben einen sich überdeckenden Längenabschnitt, an dem das gestanzte Blechstück parallel zu der zugeordneten Leiterbahn liegt und an dieser anliegt. Der überdeckende Längenabschnitt sollte dabei so gewählt werden, dass eine sichere Kontaktierung der aneinanderliegenden Bauteile erreicht wird. Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung weist das Blechstück wenigstens einen, vorzugsweise mehrere Vorsprünge auf, die besonders bevorzugt mittels Stanzen an dem Blechstück ausgebildet sind. Entsprechende Vorsprünge können auch alternativ ausschließlich an dem die Leiterbahn bildenden Blechband vorgesehen sein. Ebenso gut können entsprechende Vorsprünge sowohl an dem Blechband als auch dem Blechstück vorgesehen sein. Die Vorsprünge dienen der spezifischen elektrischen Kontaktierung der beiden Bauteile in dem überdeckenden Längenbereich. Allein über diese Vorsprünge soll eine elektrische Kontaktierung zwischen Blechband und Kontaktzunge erfolgen. Dadurch wird gewährleistet, dass die Stromeinleitung von der Kontaktzunge in die Leiterbahn in definierter Weise erfolgt.Preferably, the sheet metal piece and the conductor track, which is particularly preferably formed in the form of a sheet-metal strip, provided parallel to each other and have a overlapping length portion at which the stamped sheet metal piece is parallel to the associated conductor track and rests against this. The overlapping length section should be chosen so that a secure contact of the adjacent components is achieved. According to a further preferred embodiment of the present invention, the sheet metal piece at least one, preferably a plurality of projections, which are particularly preferably formed by means of stamping on the sheet metal piece. Corresponding projections can alternatively also be provided exclusively on the metal strip forming the conductor track. Equally well corresponding projections can be provided both on the sheet metal strip and the piece of sheet metal. The projections serve for the specific electrical contacting of the two components in the overlapping length range. On these projections alone, an electrical contact between sheet metal strip and contact tongue should be done. This ensures that the current is introduced from the contact tongue in the conductor in a defined manner.
Im Hinblick auf eine möglichst kostengünstige Fertigung wird gemäß einer bevorzugten Weiterbildung der vorliegenden Erfindung vorgeschlagen, die Leiterbahn mit der Kontaktzunge über ein Federelement zu verbinden. Das Federelement stellt eine kraftschlüssige Verbindung der beiden Bauteile her, vorzugsweise, sofern diese sich überdeckende Längenabschnitte aufweisen, durch Anpressen der beiden Bauteile gegeneinander. Dabei kann gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung das Federelement auch genutzt werden, um das Blechstück an dem Gehäuse zu halten. Diese Halterung kann unmittelbar durch Zusammenwirken des Federelementes mit dem Gehäuse bzw. Gehäuseteilen erfolgen. Das Federelement kann beispielsweise das Blechstück unter Zwischenlage von entsprechenden Wandungen des Gehäuses klemmen und somit gegenüber dem Gehäuse festlegen. Alternativ kann das Federelement auch in einer spezifisch zur Aufnahme des Federelemetes ausgebildeten Gehäuses vorgesehen sein, die im Folgenden als Federaufnahme bezeichnet wird und welche derart ausgebildet ist, dass diese das Federelement mit wenig Spiel hält. Die Federaufnahme bildet dementsprechend Anschläge aus, gegen welche die Feder bei einer eventuellen Relativbewegung der in das Gehäuse eingesetzten Kontaktzunge anstößt, um diese Relativbewegung zu begrenzen.With regard to the most cost-effective production is proposed according to a preferred embodiment of the present invention, to connect the conductor to the contact tongue via a spring element. The spring element establishes a frictional connection of the two components, preferably, provided that these overlapping longitudinal sections have, by pressing the two components against each other. In this case, according to a further preferred embodiment of the present invention, the spring element can also be used to hold the sheet metal piece to the housing. This holder can be done directly by interaction of the spring element with the housing or housing parts. The spring element, for example, clamp the sheet metal piece with the interposition of corresponding walls of the housing and thus set against the housing. Alternatively, the spring element can also be provided in a housing designed specifically for receiving the spring element, which is referred to below as a spring receptacle and which is designed such that it holds the spring element with little play. The spring receptacle accordingly forms stops, against which the spring abuts in the event of a possible relative movement of the contact tongue inserted into the housing in order to limit this relative movement.
Zur Vereinfachung der Montage des elektrischen Zuheizers umfasst das Gehäuse ein Gehäuseunterteil, welches im wesentlichen schalenförmig ausgebildet ist und den Schichtaufbau zumindest teilweise umfänglich fasst, so dass der Schichtaufbau in vorgegebener Weise durch Einlegen in das Gehäuseunterteil positioniert werden kann. Des Weiteren ist das Gehäuseunterteil so ausgebildet, dass dieses in Zusammenwirken mit den Konturen des Federelementes in der Einbaulage desselben eine Beweglichkeit in Längsrichtung der Lagen des Schichtaufbaus im wesentlichen verhindert. Durch Zusammenwirken von Gehäuseunterteil und Federelement ist dementsprechend die Lage des Federelementes in Längsrichtung der Leiterbahnen im wesentlichen vorgegeben. Insbesondere wird die vorerwähnte Federaufnahme durch das Gehäuseunterteil ausgebildet.To simplify the assembly of the electrical auxiliary heater, the housing comprises a housing lower part, which is substantially cup-shaped and the layer structure at least partially circumferentially sums, so that the layer structure can be positioned in a predetermined manner by inserting into the housing base. Furthermore, the lower housing part is formed so that this in cooperation with the contours of the spring element in the installed position thereof substantially prevents mobility in the longitudinal direction of the layers of the layer structure. By interaction of the lower housing part and the spring element, the position of the spring element in the longitudinal direction of the conductor tracks is accordingly substantially predetermined. In particular, the aforementioned spring receptacle is formed by the lower housing part.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung ist das Federelement in Form einer Federklammer ausgeformt, deren einander gegenüberliegende Federschenkel in der Einbaulage des Federelementes zwischen sich die Leiterbahn und das Blechstück klemmen. Vorzugsweise ist zu jeder Kontaktzunge je eine entsprechende Federklammer vorgesehen, deren Federkraft alleine das gegeneinander Anliegen von Leiterbahn und Blechstück bewirken.According to a further preferred embodiment of the present invention, the spring element is formed in the form of a spring clip whose opposite spring legs clamp in the installed position of the spring element between the conductor track and the piece of sheet metal. Preferably, a respective spring clip is provided for each contact tongue, the spring force alone cause the mutual concern of conductor track and piece of sheet metal.
Zur Fixierung der die Leiterbahn und das Blechstück klemmenden Federklammer wird gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung vorgeschlagen, dass beiderseits des Blechstücks und/oder der Leiterbahn Vorsprünge ausgebildet sind und dass wenigstens einer der Federschenkel zwischen zwei Vorsprüngen an dem Blechstück oder der Leiterbahn anliegt. Die Vorsprünge, die vorzugsweise in einander gegenüberliegenden parallelen Reihen vorgesehen sein können, bilden dementsprechend Erhebungen zwischen sich eine Anlagefläche des Federschenkels an dem Blechstück bzw. der Leiterbahn aus und verhindern, dass die Federklammer in einer Richtung im wesentlichen rechtwinklig zur Längserstreckung der Leiterbahn abrutschen kann. Dabei wird davon ausgegangen, dass die Federklammer vorzugsweise einander gegenüberliegende konvex gekrümmte Vorsprünge ausbildet, welche an dem Blechstück bzw. an der Leiterbahn anliegen und mit gewissem Abstand die an dem Blechstück und/oder der Leiterbahn vorgesehenen Vorsprünge passieren. Mit anderen Worten sollten die Federschenkel mit ihren konvex gekrümmten Vorsprüngen sicher zwischen den einander gegenüberliegenden, vorzugsweise mittels Stanzen ausgeformten Vorsprüngen an dem Blechstück bzw. der Leiterbahn anliegen.For fixing the conductor track and the piece of sheet metal clamping spring clip is proposed according to a further preferred embodiment of the present invention that on both sides of the sheet piece and / or the conductor projections are formed and that at least one of the spring legs between two projections on the sheet metal piece or the conductor is present. The projections, which may preferably be provided in opposite parallel rows, accordingly form elevations between them a contact surface of the spring leg on the sheet metal piece or the conductor track and prevent the spring clip from slipping in a direction substantially perpendicular to the longitudinal extension of the conductor track. It is assumed that the spring clip preferably forms mutually opposite convexly curved projections which abut against the piece of sheet metal or on the conductor track and with a certain distance pass through the projections provided on the piece of sheet metal and / or the conductor track. In other words, the spring legs should rest with their convex curved projections securely between the opposite, preferably formed by punching projections on the sheet metal piece or the conductor track.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung, welche eine einfache Vormontage sämtlicher Einzelteile des elektrischen Zuheizers ermöglicht, bildet das Gehäuseunterteil die Federaufnahme aus, und zwar in solcher Weise, dass sich diese in Einlegerichtung der Elemente des Schichtaufbaus öffnet. Innerhalb der Federaufnahme befindet sich ferner bei dieser bevorzugten Ausgestaltung der überdeckende Längenabschnitt. Vorzugsweise ist dieser überdeckende Längenabschnitt im wesentlichen auf die Erstreckung der Federaufnahme beschränkt.According to a further preferred embodiment of the present invention, which allows a simple pre-assembly of all the individual parts of the electric heater, the lower housing part forms the spring seat, in such a way that it opens in Einlegerichtung the elements of the layer structure. Within the spring receiver is also located in this preferred embodiment, the overlapping length section. Preferably, this overlapping longitudinal section is essentially limited to the extension of the spring receiver.
Zur Positionierung der ausgewählten Leiterbahn bzw. des Blechstücks vor der fertigen Montage sämtlicher Bauteile des elektrischen Zuheizers, insbesondere vor dem Anbringen der Federklammer ist es zu bevorzugen, die Federaufnahmen mit sich in Längsrichtung der Lagen des Schichtaufbaus öffnenden Schlitzen zu versehen, die zur Aufnahme des Blechstücks und/oder der Leiterbahn passend ausgeformt sind. Die Schlitze sind dabei vorzugsweise so dimensioniert, dass die Leiterbahn, insbesondere aber das Blechstück parallel zu den Ebenen des Schichtaufbaus ausgerichtet ist. Dementsprechend kann eine in Einschieberichtung über die Leiterbahn und das Blechstück geschobene Federklammer beide Teile sicher greifen und unter Vorspannung gegeneinander anlegen. Die Federklammer hat hiefür an ihrem vorderen Bereich vorzugsweise eine leicht trichterförmig ausgeformte und durch die beiden Federschenkel gebildete Einbringöffnung.For positioning of the selected conductor track or the piece of sheet metal before the finished assembly of all components of the electric heater, in particular before attaching the spring clip, it is preferable to provide the spring retainers with slots opening in the longitudinal direction of the layers of the layer structure, for receiving the sheet metal piece and / or the conductor track are shaped appropriately. The slots are preferably dimensioned so that the conductor track, but in particular the sheet metal piece is aligned parallel to the planes of the layer structure. Accordingly, a pushed in the insertion direction over the conductor track and the piece of sheet metal spring clip grip both parts safely and create under bias against each other. The spring clip has for this purpose at its front region preferably a slightly funnel-shaped and formed by the two spring leg insertion hole.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung ist die maximale Eindringtiefe des Blechstücks in das Gehäuse durch die Ausgestaltung wenigstens einer der Schlitze begrenzt. Vorzugsweise der zwischen der Federaufnahme und dem Schichtaufbau vorgesehene Schlitz bildet hierbei einen Anschlag für das Blechstück aus, der ein tieferes Eindringen desselben in Richtung auf den Schichtaufbau verhindert, so dass auch bei einer Stoßbeanspruchung der Kontaktzungen diese nicht bis in das Gehäuse verschoben werden und dort einen Kurzschluss verursachen können.According to a further preferred embodiment of the present invention, the maximum penetration depth of the sheet metal piece into the housing by the embodiment at least one of the slots limited. Preferably, the slot provided between the spring receptacle and the layer structure forms a stop for the piece of sheet metal, which prevents it from penetrating deeper in the direction of the layer structure, so that even when the contact tongues are subjected to an impact, they are not displaced into the housing and there Cause short circuit.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung bildet das Blechstück an seinem, das Gehäuse überragenden Ende einen Aufsteckabschnitt aus. Dieser ist dadurch gekennzeichnet, dass er Funktionsflächen aufweist, die an Kontaktflächen eines an die Kontaktzungen anzusteckenden Steckelementes speziell angepasst sind. Die entsprechende Funktionsfläche unterscheidet sich insbesondere von der Ausgestaltung und speziell der Abmessung des Blechstücks im Bereich des überdeckenden Längenabschnitts.According to a further preferred embodiment of the present invention, the sheet metal piece forms at its, the housing superior end of a slip-on. This is characterized in that it has functional surfaces which are specially adapted to contact surfaces of a plug-in element to be attached to the contact tongues. The corresponding functional surface differs in particular from the design and especially the dimension of the sheet metal piece in the region of the overlapping longitudinal section.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung ist das Blechstück mittels Formschluss in Längsrichtung der Lagen des Schichtaufbaus an dem Gehäuse gehalten. Hierzu wird an einer Seitenfläche des Blechstücks vorzugsweise eine sich öffnende Nut vorgesehen, und zwar zwischen dem Aufsteckabschnitt und dem überdeckenden Längenabschnitt des Blechstücks. In diese Nut greift ein durch das Gehäuse ausgebildeter Vorsprung ein, der das Blechstück mit wenig oder so gut wie gar keinem Spiel hält.According to a further preferred embodiment of the present invention, the sheet metal piece is held by means of positive engagement in the longitudinal direction of the layers of the layer structure on the housing. For this purpose, an opening groove is preferably provided on a side surface of the sheet metal piece, between the Aufsteckabschnitt and the overlapping longitudinal portion of the sheet metal piece. In this groove engages a formed by the housing projection, which holds the piece of sheet metal with little or almost no play.
Gemäß einer weiteren bevorzugten Ausgestaltung endet der überdeckende Längenabschnitt der Leiterbahn vorzugsweise vor der Nut, d. h., die Leiterbahn überragt die Nut nicht nach außen. Sofern gemäß einer weiteren bevorzugten Ausgestaltung der in die Nut eingreifende Vorsprung Teil eines Randes ist, welcher in Umfangsrichtung das Gehäuse umläuft, d. h., der Vorsprung im wesentlichen an der Außenfläche des Gehäuses vorgesehen ist, wird sichergestellt, dass die Leiterbahn vollständig innerhalb des Gehäuses aufgenommen ist und allein das Blechstück das Gehäuse überragt.According to a further preferred embodiment, the overlapping longitudinal portion of the conductor preferably ends in front of the groove, d. h., The track does not extend beyond the groove to the outside. If, according to a further preferred embodiment, the protrusion engaging in the groove is part of an edge which circumferentially surrounds the housing, d. h., The projection is provided substantially on the outer surface of the housing, it is ensured that the conductor track is completely received within the housing and only the sheet metal piece projects beyond the housing.
Da das Gehäuseoberteil üblicherweise nach Art eines Deckels auf dem Gehäuseunterteil aufliegt, wird gemäß einer weiteren bevorzugten Ausgestaltung auch mit Rücksicht auf eine Fixierung der Federklammer in der Federaufnahme vorgeschlagen, einen die beiden Federschenkel der Federklammer verbindenden Steg in etwa höhengleich mit dem freien Ende der durch das Gehäuseunterteil ausgebildeten Federaufnahme anzuordnen. Dadurch wird verhindert, dass die Federklammer aus der Federaufnahme hinausgedrängt wird. Die Federklammer stößt bei einer solchen Herausdrängbewegung unmittelbar gegen das Gehäuseoberteil, welches die Federklammer in Position hält.Since the upper housing part usually rests in the manner of a cover on the lower housing part, is proposed according to a further preferred embodiment, with respect to a fixation of the spring clip in the spring receiving a connecting the two spring legs of the spring clip web in about the same height with the free end of the Lower housing part designed to arrange spring receptacle. This will prevent the spring clip from being forced out of the spring retainer. The spring clip abuts directly against the upper housing part, which holds the spring clip in position at such a Ausdrängbewegung.
Zur leichteren Montage der Federklammern und auch im Hinblick auf eine eindeutige Zuordnung von Gehäuseunterteil und Gehäuseoberteil wird gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung vorgeschlagen, die Federaufnahmen zu mehreren Kontaktzungen so auszubilden, dass diese einen Rand des Gehäuseunterteils überragen. Bei diesem Rand handelt es sich um einen Rand, der üblicherweise parallel zu der von der Luft durchströmten Ober- bzw. Unterseite des Gehäuses liegt und an dem das deckelförmige Gehäuseoberteil bei geschlossenem Deckel anliegt. Mit anderen Worten wird besagter Rand außenseitig durch den in Umfangrichtung des Gehäuses umlaufenden Rand des Gehäuses begrenzt. Der in Umfangsrichtung umlaufende Rand des Gehäuses erstreckt sich im wesentlichen rechtwinklig zu dem Rand, der von den Federaufnahmen überragt wird. Bei dieser Ausgestaltung springen also die Federaufnahmen in Richtung auf das Gehäuseoberteil vor.To facilitate assembly of the spring clips and also with regard to an unambiguous assignment of the lower housing part and upper housing part is proposed according to another preferred embodiment of the present invention, the spring receptacles to form a plurality of contact tongues so that they project beyond an edge of the housing base. This edge is an edge which is usually parallel to the upper or lower side of the housing through which the air flows and against which the lid-shaped upper housing part rests when the cover is closed. In other words, said edge is bounded on the outside by the circumferential in the circumferential direction of the housing edge of the housing. The circumferentially circumferential edge of the housing extends substantially perpendicular to the edge, which is surmounted by the spring receivers. In this embodiment, therefore, the spring retainers project in the direction of the upper housing part.
Schließlich wird gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung vorgeschlagen, die Oberseite des Schichtbaus in etwa höhengleich mit dem freien Ende der Federaufnahmen enden zu lassen, wodurch die Montage vereinfacht und der Materialaufwand zur Erstellung des Gehäuses in einem vertretbaren Rahmen gehalten wird.Finally, it is proposed according to a further preferred embodiment of the present invention to end the top of the layer structure approximately at the same height with the free end of the spring receptacles, whereby the assembly is simplified and the cost of materials for the creation of the housing is kept within a reasonable framework.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels in Verbindung mit der Zeichnung. In dieser zeigen:
- Fig. 1
- eine perspektivische Seitenansicht eines Ausführungsbeispiels der elektrischen Heizvorrichtung;
- Fig. 2
- eine Seitenansicht auf ein Gehäuseunterteil mit darin eingebautem Heizblock des in
Fig. 1 gezeigten Ausführungsbeispiels; - Fig. 3
- einen vergrößerten Ausschnitt der Darstellung gemäß
Figur 2 ; - Fig. 4
- eine perspektivische Seitenansicht des in
Fig. 1 bis 3 gezeigten Ausführungsbeispiels; - Fig. 5
- eine perspektivische Seitenansicht des Gehäuseoberteils der elektrischen Heizvorrichtung nach
Fig. 1 ; - Fig. 6
- eine perspektivische Explosionsdarstellung eines wärmeerzeugenden Elementes der elektrischen Heizvorrichtung nach
Fig. 1 ; - Fig. 7
- eine Schnittdarstellung entlang der Linie VII-VII gemäß der Darstellung in
Fig. 6 eines montierten wärmeerzeugenden Elementes; - Fig. 8
- eine perspektivische Stirnseitenansicht eines wärmeerzeugenden Elementes mit daran angeschlossener Kontaktzunge;
- Fig. 9
- eine perspektivische Stirnseitenansicht des noch offenen Gehäuses in etwa entsprechend
Fig. 3 ; - Fig. 10
- das in
Fig. 8 dargestellte Federelement; - Fig. 11
- ein Ausführungsbeispiel eines die Kontaktzunge bildenden Blechstücks in einer perspektivischen Draufsicht und
- Fig. 12
- das in
Fig. 11 gezeigte Ausführungsbeispiel eines Blechstücks in der stirnseitigen Ansicht.
- Fig. 1
- a side perspective view of an embodiment of the electric heater;
- Fig. 2
- a side view of a housing base with built-in heating block of in
Fig. 1 shown embodiment; - Fig. 3
- an enlarged section of the illustration according to
FIG. 2 ; - Fig. 4
- a side perspective view of the
Fig. 1 to 3 shown embodiment; - Fig. 5
- a perspective side view of the housing top of the electric heating device according to
Fig. 1 ; - Fig. 6
- an exploded perspective view of a heat generating element of the electric heating device according to
Fig. 1 ; - Fig. 7
- a sectional view taken along the line VII-VII as shown in FIG
Fig. 6 a mounted heat generating element; - Fig. 8
- a perspective end view of a heat generating element with attached contact tongue;
- Fig. 9
- a perspective front view of the still open housing approximately corresponding
Fig. 3 ; - Fig. 10
- this in
Fig. 8 illustrated spring element; - Fig. 11
- an embodiment of a contact piece forming sheet metal piece in a perspective plan view and
- Fig. 12
- this in
Fig. 11 shown embodiment of a piece of sheet metal in the frontal view.
Die
An einer Stirnseite des Gehäuses 2 wird dieses von fünf in Querrichtung übereinander angeordneten Kontaktzungen 14 überragt. Die Kontaktzungen treten durch an dem Gehäuse 2 ausgesparte Schlitze 15 hindurch, die jeweils für sich eine Kontaktzunge 14 aufnehmen und überwiegend durch das Gehäuseunterteil 4 gebildet sind, jedoch an einer Stirnseite durch das Gehäuseoberteil 6 komplettiert sind.At one end face of the
Das Gehäuse 2 weist zwei gegenüberliegende Rahmenöffnungen auf, von denen in
Die
Wie zu erkennen, weist das gezeigte Ausführungsbeispiel vier wärmeerzeugende Elemente 10 auf, die jeweils stirnseitig isolierend und mit gewisser Beweglichkeit quer zu den Lagen des Schichtaufbaus (Heizblocks 8) in dem Gehäuseunterteil 4 aufgenommen sind. Das Gehäuseunterteil 4 weist hierzu Passelementaufnahmen 22 auf, die sich einer Aufnahme 24, die im wesentlichen durch das Gehäuseunterteil 4 gebildet ist und den Heizblock 8 aufnimmt, öffnen. An jeder Stirnseite des Gehäuseunterteils 4 sind bei dem gezeigten Ausführungsbeispiel zwei unterschiedliche Arten von Passelementaufnahmen 22a, 22b vorgesehen (vgl. auch
Während die wärmeerzeugenden Elementen 10 nicht an jeder beliebigen Stelle im Gehäuse 2 eingesetzt werden können, sind die wärmeabgebenden Wellrippenelemente 12 unspezifisch und als Längenabschnitte eines mäandrierend gebogenen zunächst Blechstreifens als gefertigt und von diesem Endlosmaterial auf Länge geschnitten. Jedes einzelne wärmeabgebende Element 12 kann an beliebiger Position für ein wärmeabgebendes Element innerhalb des Heizblocks 8 eingesetzt werden.While the heat-generating
Die Passelemente 26 sind einstückig an einem Positionsrahmen 28 angeformt, der in den
Die stirnseitigen Enden der Positionsrahmen 28 sind über einen Passelementsteg 38 über die Lage der Blechbänder 34, 36 hinaus verlängert. Am äußeren Ende der Passelementstege 38 befinden sich die jeweiligen Passelemente 26 des Positionsrahmens 28. Wie die Querschnittsansicht entlang der in
Das auf diese Weise mittels Spritzgießen hergestellte einteilige Bauteil wird danach mit den wesentlichen Teilen des wärmeerzeugenden Elementes 10 versehen, d.h. die PTC-Heizelemente 30 werden in die korrespondierenden Aufnahme 32 eingelegt und beidseitig von den Blechbändern 34, 36 umgeben. Danach werden die Vorsprünge plastisch nach innen verformt und so die Leiterbahnen 34, 36 übergreifend ausgebildet.The one-piece component thus produced by injection molding is then provided with the essential parts of the heat-generating
Das wärmeerzeugende Element 10 ist als vormontiertes Bauteil ausgebildet und kann somit bei der Montage gehandhabt werden, ohne dass die Gefahr besteht, dass die Leiterbahnen 34, 36 oder gar die in den Positionsrahmen 28 eingelegten PTC-Heizelemente 30 verloren gehen. Es sei jedoch darauf hingewiesen, dass üblicherweise die Haltestege lediglich die Blechbänder 34, 36 in dem Positionsrahmen fixieren, diese aber nicht mit einer Anpresskraft gegen die PTC-Heizelemente 30 legen, welche ausreicht, die PTC-Heizelemente 30 sicher beim Betrieb zu bestromen. Dies wird jedenfalls bei der im Rahmen der vorliegenden Erfindung diskutierten Ausgestaltung durch ein Federelement bewirkt, welches in das Gehäuse 2 eingesetzt ist und den gesamten Schichtaufbau bestehend aus wärmerzeugenden Elementen 10 und wärmeabgebenden Elementen 12 unter Vorspannung setzt.The heat-generating
Wie insbesondere den
Die in
Die zuvor bereits unter Bezugnahme auf
Die
Wie insbesondere die
An dem vorderen Aufsteckabschnitt 140 endet das Blechstück 120 konisch, um das Aufstecken eines nicht gezeigten weiblichen Steckelementes auf die Kontaktzunge 14 zu erleichtern. Wie
Das in
Die zuvor beschriebene Montage erfolgt nachdem der Schichtaufbau bestehend aus wärmeerzeugenden Elementen 10 und wärmeabgebenden Elementen 12 in das Gehäuseunterteil 4 eingebracht worden ist (vgl.
Wie
Bei dem zuvor gezeigten Ausführungsbeispiel erfolgt die elektrische Kontaktierung zwischen dem Blechstück 120 und dem Blechband 34 allein über die Klemmkraft der Federklammer 46. Diese ist aus einem Federstahl gebildet und bewirkt eine Druckspannung von zwischen 1000 und 1500N/mm2 zwischen dem Blechstück 120 und dem Blechband 34. Bei entspannter Federklammer 46 beträgt der kleinste Abstand der konvexen Anlageflächen 132 maximal 40 % der kumulierten Dicke von Blechstück 120 und Blechband 34.In the embodiment shown above, the electrical contact between the
Das Blechstück 120 ist aus einem gut elektrisch leitenden Werkstoff gebildet, bsp. einer Kupfer-Zinn-Legierung. Zumindest der Aufsteckabschnitt 140, vorzugsweise das gesamte Blechstück 120 sind jedenfalls an ihren einander gegenüberliegenden Seitenflächen mit einer Silberbeschichtung versehen, um eine möglichst gute Kontaktierung einerseits zwischen dem Blechstück 120 und dem Blechband 34 und andererseits zwischen der Kontaktzunge 14 und dem daran anzusteckenden Steckerelement zu bewirken.The
- 22
- Gehäusecasing
- 44
- GehäuseunterteilHousing bottom
- 66
- GehäuseoberteilHousing top
- 88th
- Heizblockheating block
- 1010
- wärmeerzeugende Elementheat generating element
- 1212
- wärmeabgebendes Elementheat-emitting element
- 1414
- Kontaktzungecontact tongue
- 1515
- Schlitzslot
- 1616
- Rahmenöffnung, GehäuseoberteilFrame opening, housing top
- 1818
- Rahmenöffnung, GehäuseunterteilFrame opening, lower housing part
- 2020
- Strebe/ erste StrebeStrut / first strut
- 2222
- PasselementaufnahmePass element receptacle
- 2424
- Aufnahme für den HeizblockRecording for the heating block
- 2626
- Passelementpass element
- 2828
- Positionsrahmenposition frame
- 3030
- PTC-HeizelementPTC heating element
- 3232
- Aufnahme für PTC-HeizelementMount for PTC heating element
- 3434
- Blechbandmetal strip
- 3636
- Blechbandmetal strip
- 3838
- PasselementstegPass bridge element
- 4040
- Haltestegeretaining webs
- 40.1 bis 40.540.1 to 40.5
- Abschnitte der HaltestegeSections of the retaining bars
- 4141
- Durchgangpassage
- 4242
- Versatzoffset
- 4343
- Zweite StrebeSecond strut
- 4444
-
freies Ende des Blechbandes 34free end of the
sheet metal strip 34 - 4646
- Federklammerspring clip
- 4747
- Federschenkelspring leg
- 4848
- Federaufnahmespring mount
- 5050
- Schlitzslot
- 5656
- Bodenground
- 6262
- Abstandshalterspacer
- 6363
- Innere Oberfläche der LängsholmeInner surface of the longitudinal bars
- 6464
- Längsholmlongeron
- 6666
- Längsholmlongeron
- 6868
- Zapfenführungpin guide
- 7070
- Zapfenführungpin guide
- 7272
- Zapfenführungpin guide
- 7474
- Fensterwindow
- 7676
- Führungszapfenspigot
- 7878
- Führungszapfenspigot
- 8080
- Führungszapfenspigot
- 8282
- Raststeglatching web
- 8484
- Kopfhead
- 8686
- RastflächeRest area
- 8888
- Abdeckungcover
- 9090
- Ausbuchtungbulge
- 9292
- weiterer Führungszapfenanother guide pin
- 9494
- weitere Zapfenführungfurther pin guide
- LL
- Längenabschnittlongitudinal section
- 120120
- Blechstücksheet metal piece
- 122122
- überdeckender Längenabschnittoverlapping length section
- 124124
- Vorsprüngeprojections
- 126126
- Nutengroove
- 128128
- Vorsprunghead Start
- 130130
- konvex gekrümmte Vorsprüngeconvex curved protrusions
- 132132
- konvexe Anlageflächeconvex contact surface
- 134134
- Stegweb
- 136136
- Aussparungrecess
- 138138
- verjüngte Aussparungtapered recess
- 140140
- Aufsteckabschnittmounting section
- 142142
- Anschlagattack
- 144144
- Einbringöffnungintroduction opening
Claims (18)
dadurch gekennzeichnet, dass
die Kontaktzungen (14) durch gestanzte Blechstücke (120) gebildet sind, die elektrisch mit ausgewählten Leiterbahnen (34) verbunden sind.An electric heater for air heating, in particular a heater for a motor vehicle, comprising a layer structure (10, 12) comprising a heat-generating element (10) with at least one PTC heating element (30) and on both sides of the PTC heating element (5) adjacent conductor tracks (34; 36) for energizing the PTC heating element (5) and at least one with the heat-generating element (10) thermally conductively connected heat-emitting element (12), and with a layer structure (10, 12) receiving housing (2) and contact tongues (14) for Connecting the auxiliary heater to a power source,
characterized in that
the contact tongues (14) are formed by stamped sheet metal pieces (120), which are electrically connected to selected conductor tracks (34).
dass das Gehäuseunterteil (4) und das Federelement (46) so ausgebildet sind, dass eine Einbaulage des Federelementes (46) in Längsrichtung der Leiterbahnen (34, 36) im Wesentlichen durch Zusammenwirken von Gehäuseunterteil (4) und Federelement (46) vorgegeben ist.Electric auxiliary heater according to one of Claims 4 to 6, characterized in that the housing (2) comprises a housing lower part (4) which at least partially surrounds the layer structure (10, 12) and an upper housing part (6) which can be connected to the lower housing part (4) and
in that the lower housing part (4) and the spring element (46) are designed so that an installation position of the spring element (46) in the longitudinal direction of the conductor tracks (34, 36) is predetermined essentially by the interaction of housing lower part (4) and spring element (46).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08000980A EP2019268B1 (en) | 2007-07-18 | 2008-01-18 | Electric heater |
JP2008181636A JP4856128B2 (en) | 2007-07-18 | 2008-07-11 | Electric auxiliary heater |
US12/175,134 US20090020619A1 (en) | 2007-07-18 | 2008-07-17 | Electrical Auxiliary Heater |
CN2008101335736A CN101349475B (en) | 2007-07-18 | 2008-07-17 | Electric heating device |
KR1020080069628A KR101028509B1 (en) | 2007-07-18 | 2008-07-17 | Electrical auxiliary heater |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07014115A EP2017545B1 (en) | 2007-07-18 | 2007-07-18 | Electric heating device |
EP08000980A EP2019268B1 (en) | 2007-07-18 | 2008-01-18 | Electric heater |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2019268A2 true EP2019268A2 (en) | 2009-01-28 |
EP2019268A3 EP2019268A3 (en) | 2010-07-07 |
EP2019268B1 EP2019268B1 (en) | 2012-12-26 |
Family
ID=38951283
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07014115A Active EP2017545B1 (en) | 2007-07-18 | 2007-07-18 | Electric heating device |
EP07014721A Expired - Fee Related EP2017549B1 (en) | 2007-07-18 | 2007-07-26 | Electric heating device |
EP08000980A Active EP2019268B1 (en) | 2007-07-18 | 2008-01-18 | Electric heater |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07014115A Active EP2017545B1 (en) | 2007-07-18 | 2007-07-18 | Electric heating device |
EP07014721A Expired - Fee Related EP2017549B1 (en) | 2007-07-18 | 2007-07-26 | Electric heating device |
Country Status (6)
Country | Link |
---|---|
US (2) | US8680435B2 (en) |
EP (3) | EP2017545B1 (en) |
JP (2) | JP4856127B2 (en) |
KR (2) | KR100970043B1 (en) |
CN (2) | CN101349475B (en) |
ES (1) | ES2382138T3 (en) |
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EP2275753A1 (en) | 2009-06-19 | 2011-01-19 | Eberspächer catem GmbH & Co. KG | Method for manufacturing an electrical heating device and electrical heating device |
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KR20200049417A (en) | 2018-10-31 | 2020-05-08 | 전주대학교 산학협력단 | Carbon surface heating element for interior ceiling of vehicle |
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DE102019217234A1 (en) * | 2019-11-07 | 2021-05-12 | Eberspächer Catem Gmbh & Co. Kg | PTC heating device and electrical heating device with such a PTC heating device and method for producing an electrical heating device |
DE102019220589A1 (en) * | 2019-12-27 | 2021-07-01 | Eberspächer Catem Gmbh & Co. Kg | Heat generating element and process for its manufacture |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP2275753A1 (en) | 2009-06-19 | 2011-01-19 | Eberspächer catem GmbH & Co. KG | Method for manufacturing an electrical heating device and electrical heating device |
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Also Published As
Publication number | Publication date |
---|---|
CN101349476B (en) | 2010-06-02 |
JP4856128B2 (en) | 2012-01-18 |
US8680435B2 (en) | 2014-03-25 |
EP2017545B1 (en) | 2012-04-25 |
EP2017549B1 (en) | 2012-05-02 |
KR101028509B1 (en) | 2011-04-11 |
KR20090009131A (en) | 2009-01-22 |
CN101349476A (en) | 2009-01-21 |
US20090026189A1 (en) | 2009-01-29 |
EP2017549A1 (en) | 2009-01-21 |
KR20090009130A (en) | 2009-01-22 |
JP2009051494A (en) | 2009-03-12 |
ES2382138T3 (en) | 2012-06-05 |
EP2019268B1 (en) | 2012-12-26 |
CN101349475B (en) | 2011-07-27 |
JP4856127B2 (en) | 2012-01-18 |
EP2017545A1 (en) | 2009-01-21 |
JP2009035247A (en) | 2009-02-19 |
CN101349475A (en) | 2009-01-21 |
US20090020619A1 (en) | 2009-01-22 |
KR100970043B1 (en) | 2010-07-16 |
EP2019268A3 (en) | 2010-07-07 |
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