WO2019072798A1 - Method for producing a tank heater and tank heater - Google Patents
Method for producing a tank heater and tank heater Download PDFInfo
- Publication number
- WO2019072798A1 WO2019072798A1 PCT/EP2018/077398 EP2018077398W WO2019072798A1 WO 2019072798 A1 WO2019072798 A1 WO 2019072798A1 EP 2018077398 W EP2018077398 W EP 2018077398W WO 2019072798 A1 WO2019072798 A1 WO 2019072798A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing part
- spring element
- ptc
- ptc heater
- heat transfer
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/78—Heating arrangements specially adapted for immersion heating
- H05B3/82—Fixedly-mounted immersion heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/24—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor being self-supporting
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/02—Heaters using heating elements having a positive temperature coefficient
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/021—Heaters specially adapted for heating liquids
Definitions
- a tank heater and a method for producing a tank heater with the features specified in the preamble of claim 1 is known from DE 10 2014 212 544 A1.
- Tank heaters for heating liquids in motor vehicles have a metal housing in which a PTC heater is arranged with a PTC heating resistor and a contact element, and a plastic sheath, which protects the metal housing from contact with liquid.
- a PTC heater is arranged with a PTC heating resistor and a contact element
- plastic sheath which protects the metal housing from contact with liquid.
- Extruded profiles allow a very good thermal coupling of the PTC heating resistor to the metal housing by simple means by the Extruded profile is pressed after inserting the PTC heater.
- the possible shapes of the metal housing are limited, which is why increasingly castings for metal housing of tank heaters are used. Castings also allow the use of less expensive alloys, but make it difficult a good thermal coupling of the PTC heater to the metal housing, in particular because no channels or pockets can be produced with low-cost alloys, record the PTC heater and then can be pressed.
- a steel spring plate is used, which is fixed to retaining ribs of the housing part, wherein the retaining ribs are compressed after setting to press the PTC heater with sufficient pressure against a heat transfer surface of a housing part and so make a sufficient thermal contact between PTC heater and metal housing.
- Object of the present invention is to show a way, as in a tank heater whose metal housing is a casting, the heat coupling of the PTC heater can be improved.
- the casting in the manufacture of the tank heater, is machined by flattening the heat transfer surface of the housing part, via which heat generated by the PTC heating resistor passes to the housing part.
- the housing part is flattened by plastic deformation, for example by pressing a punch by means of a rolling tool.
- the housing part of the tank heater therefore preferably has a heat transfer surface leveled by plastic deformation. Another possibility is the leveling over a machining such as milling or grinding.
- the casting can be made for example by die casting, such as an alloy based on aluminum.
- the surfaces of a casting are generally not as flat or smooth as in an extruded profile. By machining the casting, it is therefore possible to achieve improved thermal contact between the PTC heater and the housing part.
- the inventively preferred leveling of the thermal contact surface by pressing a stamp can be carried out with little effort, optionally, the force acting on the heat contact surface punch can be supplemented by a matching formed to the opposite surface of the housing part lower punch.
- the PTC heater may include one or more PTC heating elements and one or more contact elements.
- the metal housing is used for electrically contacting the PTC heating element or the PTC heating elements, so that a single contact element, for. B. a contact plate, sufficient.
- PTC heating element (s) and contact element (s) can be held by a plastic frame, which can also support an insulator, which electrically isolates the or one of the contact elements of the metallic housing part.
- the insulator may be, for example, a ceramic plate, such as alumina, or a plastic film.
- a spring element which generates a spring force which presses the PTC heater against the heat transfer surface, can be fastened to the housing part prior to the sheathing.
- the spring element is preferably made of an alloy based on aluminum. Aluminum alloys have a good thermal conductivity, so that heat generated by the PTC heater can advantageously also be dissipated via the spring element.
- an advantageous development of the invention provides that the spring element is locked or caulked to the housing part.
- that can Spring element are attached to the housing part by being clipped onto the housing part.
- the housing part on opposite sides of the heat transfer surface has walls which have an undercut, with which the spring element is hooked.
- the spring element may for example have two strips with latching hooks, between which extends a resilient lid surface. The spring element can thus form part of the housing in this way and allow easy assembly of the housing.
- the spring element is an extruded profile.
- an extruded profile can also be well rounded prior to assembly, so that no more sharp edges are present when encapsulating with plastic.
- Fig. 1 is a sectional view of a tank heater
- FIG. 2 shows the tank heater of FIG. 1 without plastic jacket and spring element
- FIG. 3 shows the spring element of the tank heater shown in FIG. 1
- FIG. 2 shows the tank heater of FIG. 1 without plastic jacket and spring element
- FIG. 3 shows the spring element of the tank heater shown in FIG. 1
- FIG. 2 shows the tank heater of FIG. 1 without plastic jacket and spring element
- FIG. 3 shows the spring element of the tank heater shown in FIG. 1
- FIG. 1 shows the tank heater of FIG. 1 without plastic jacket and spring element
- FIG. 4 shows a perspective longitudinal section along the line A - A through the casting of the tank heater shown in FIG. 1;
- Fig. 5 is a sectional view of another embodiment of a tank heater
- Fig. 6 is a sectional view of another embodiment of a tank heater
- FIG. 7 shows an embodiment of a housing part for caulking with a spring element
- FIG. 8 shows a further embodiment of a tank heater without the plastic jacket.
- the tank heater illustrated in a sectional view in FIG. 1 contains a PTC heater which contains at least one PTC heating resistor 1 and may additionally comprise, for example, a contact element 2 and an insulator 3 and a plastic frame 4 which holds the various components of the PTC heater ,
- the PTC heater is pressed by a spring element 5 against a heat transfer surface 66 of the housing part 6, passes over the heat generated by the PTC heating resistor 1 to the housing part 6.
- the PTC resistor 1 lies flat against the heat transfer surface 66 of the housing part, since the PTC resistor 1 is electrically contacted via the housing part 6.
- another component of the PTC heater can be applied flat against the heat transfer surface 66, such as a ceramic plate or other insulator.
- the housing part 6 is a casting, which has been produced for example by die casting. Before the PTC heater is connected to the housing part 6, the heat transfer surface 66 of the housing part 6, leveled by plastic deformation, for example by pressing a punch. In this way, the heat coupling of the PTC heater to the housing part 6 is improved.
- the housing part 6 of the PTC heater After flattening the heat transfer surface 66 of the housing part 6 of the PTC heater is placed on the heat transfer surface 66 and the spring element 5 aufküst on the housing part 6. Thereafter, the housing part 6 and the spring element 5 and the PTC heater arranged between them are encapsulated with plastic, so that they are then protected by a plastic jacket 7 from contact with a liquid to be heated.
- the housing part 6 has on opposite sides of the heat transfer surface 66 walls 61, which have an undercut, with which the spring element 5 is hooked.
- the undercut can be formed for example by a groove 62 in the respective side wall 61.
- an upper, the undercut forming boundary surface 64 of the groove 62 extends parallel to the heat transfer surface 66 and a lower boundary surface 65 of the groove 62 obliquely to the upper boundary surface of the groove 62.
- the groove 62 so spreads in its longitudinal direction.
- the housing part 6 is easier to remove from its mold. 4
- the hidden cut edges of a longitudinal section through the housing part 2 are shown by dashed lines in a sectional view of the housing part 2, to illustrate this.
- the spring element 5 shown isolated in Fig. 3 is locked to the housing part 6.
- the corresponding positive fit acts perpendicular to the heat transfer surface of the housing part 6.
- the spring element 5 may have two strips 51 with latching hooks 52, which hook with the undercut of the opposite side walls 61 of the housing part 6.
- the boundary surface 64, and / or the contact surface 54, which is in engagement with the delimiting surface, of the latching hooks 52 is advantageously inclined to Heat transfer surface 66 running so that the spring element 5 can remain securely locked.
- a resilient ceiling wall 53 extends, which presses against the PTC heater, for example, against an insulator 3, such as a ceramic plate or plastic.
- the spring element 5 thus has a basically U-shaped configuration.
- the ceiling inner surface 55 at least before fastening a curved toward the center of the PTC heater out contour, which is at least the central region of the PTC heater securely entangled with the heat transfer surface 66 and the spring element 5 after entanglement.
- Both the spring element 5 and the housing part 6 may be made of an aluminum-based alloy. While a low-cost standard casting alloy can preferably be used for the casting, the spring element 5 is preferably produced from a spring-hard alloy such as, for example, an AlMgSi alloy.
- the spring element 5 can be produced by extrusion, so be an extruded profile. Unlike a thin steel spring plate, where it is difficult to avoid sharp edges, an aluminum-based alloy spring element can easily have rounded edges. Is the spring element z. B. produced as an extruded part, so the edges after cutting can be such z. B. be reworked by sandblasting that the edges are rounded afterwards.
- the housing part 6 may have further walls, for example a rear wall 63 which extends transversely to the opposite side walls 61 which have the undercut.
- a rear wall 63 which extends transversely to the opposite side walls 61 which have the undercut.
- FIG. 5 shows a sectional view of a further exemplary embodiment of a tank heater, which differs from the exemplary embodiment discussed above essentially by the orientation of the latching hooks 52 of the spring element 5 and the cooperating undercut of the side walls 62. While in the embodiment of Figures 1 to 4, the latching hooks 52 of the spring element 5 are directed inward and facing each other, the latching hooks are in the embodiment of FIG. 5 directed to the outside and facing away from each other. Nevertheless, in order to be able to tightly surround the PTC heater with side walls 61 and a rear wall, the undercuts are not attached to the side walls 61, but to further outer side walls 67
- Fig. 6 shows a sectional view of another embodiment of a tank heater.
- This embodiment differs from the embodiments described above essentially in that the spring element 5 is fixed by caulking to the housing part 6.
- the housing part 6 has protruding pins 8, preferably on the front side of the walls 61.
- the pins pass through 8 openings in the spring element 5 and are caulked on the top under bias with a tool such that a positive connection is created.
- only one pin 8 can be seen on each end face.
- the pins 8 may be integrally formed with the housing part 6 or made separately. It is particularly preferred that the pins 8 are arranged laterally offset.
- FIG. 7 an alternative embodiment is shown in which on each side of a single, elongated pin 8 with slightly tapered side surfaces engages through an elongated opening in the spring element. It is also possible, however, a variant of FIG. 8, in which the spring element 5 between the spring element 5 superior rails 9 is inserted and the rails 9 are partially caulked at the edge in such a way that the caulked areas 10 engage over the spring element 5 under bias on the edge and fix it. LIST OF REFERENCE NUMBERS
Landscapes
- Resistance Heating (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112018004481.5T DE112018004481A5 (en) | 2017-10-10 | 2018-10-09 | Process for manufacturing a tank heater and tank heater |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017123546.9 | 2017-10-10 | ||
DE102017123546.9A DE102017123546A1 (en) | 2017-10-10 | 2017-10-10 | Method for producing a tank heater and tank heater |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019072798A1 true WO2019072798A1 (en) | 2019-04-18 |
Family
ID=63832422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2018/077398 WO2019072798A1 (en) | 2017-10-10 | 2018-10-09 | Method for producing a tank heater and tank heater |
Country Status (2)
Country | Link |
---|---|
DE (2) | DE102017123546A1 (en) |
WO (1) | WO2019072798A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018122436B4 (en) | 2018-09-13 | 2024-08-22 | Eichenauer Heizelemente Gmbh & Co. Kg | Heater assembly and heater housing with such a heater assembly |
DE102019208150A1 (en) * | 2019-06-05 | 2020-12-10 | Robert Bosch Gmbh | Device for reducing mechanical loads on a functional component |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2506661A1 (en) * | 2011-04-02 | 2012-10-03 | Eichenauer Heizelemente GmbH & Co. KG | Electric heating device |
DE102012104917A1 (en) * | 2012-06-06 | 2013-12-12 | Eichenauer Heizelemente Gmbh & Co. Kg | Heating device i.e. electrical heating device, for use in liquid tank to heat chemically aggressive fluid, has wedge-shaped compensating element whose thickness decreases in longitudinal direction of opposite side walls |
DE102012213417A1 (en) * | 2012-07-31 | 2014-02-06 | Robert Bosch Gmbh | Heating device for an operating / auxiliary substance with compensating element |
DE112006001103B4 (en) | 2005-07-12 | 2014-08-21 | Eichenauer Heizelemente Gmbh & Co. Kg | tank heater |
DE102014212544A1 (en) | 2014-06-30 | 2015-12-31 | Robert Bosch Gmbh | heater |
DE102015120250B3 (en) * | 2015-11-23 | 2017-04-13 | Eichenauer Heizelemente Gmbh & Co. Kg | Method for producing a tank heater and tank heater |
-
2017
- 2017-10-10 DE DE102017123546.9A patent/DE102017123546A1/en not_active Withdrawn
-
2018
- 2018-10-09 DE DE112018004481.5T patent/DE112018004481A5/en active Pending
- 2018-10-09 WO PCT/EP2018/077398 patent/WO2019072798A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112006001103B4 (en) | 2005-07-12 | 2014-08-21 | Eichenauer Heizelemente Gmbh & Co. Kg | tank heater |
EP2506661A1 (en) * | 2011-04-02 | 2012-10-03 | Eichenauer Heizelemente GmbH & Co. KG | Electric heating device |
DE102012104917A1 (en) * | 2012-06-06 | 2013-12-12 | Eichenauer Heizelemente Gmbh & Co. Kg | Heating device i.e. electrical heating device, for use in liquid tank to heat chemically aggressive fluid, has wedge-shaped compensating element whose thickness decreases in longitudinal direction of opposite side walls |
DE102012213417A1 (en) * | 2012-07-31 | 2014-02-06 | Robert Bosch Gmbh | Heating device for an operating / auxiliary substance with compensating element |
DE102014212544A1 (en) | 2014-06-30 | 2015-12-31 | Robert Bosch Gmbh | heater |
DE102015120250B3 (en) * | 2015-11-23 | 2017-04-13 | Eichenauer Heizelemente Gmbh & Co. Kg | Method for producing a tank heater and tank heater |
Also Published As
Publication number | Publication date |
---|---|
DE112018004481A5 (en) | 2020-07-30 |
DE102017123546A1 (en) | 2019-04-11 |
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