WO2022042933A1 - Procédé de liaison d'un seul tenant d'éléments chauffants à des éléments de boîtier en matière plastique - Google Patents

Procédé de liaison d'un seul tenant d'éléments chauffants à des éléments de boîtier en matière plastique Download PDF

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Publication number
WO2022042933A1
WO2022042933A1 PCT/EP2021/069574 EP2021069574W WO2022042933A1 WO 2022042933 A1 WO2022042933 A1 WO 2022042933A1 EP 2021069574 W EP2021069574 W EP 2021069574W WO 2022042933 A1 WO2022042933 A1 WO 2022042933A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating element
housing
joining side
plastic material
connection
Prior art date
Application number
PCT/EP2021/069574
Other languages
German (de)
English (en)
Inventor
Joerg Engelhardt
Guido Bernd Finnah
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2022042933A1 publication Critical patent/WO2022042933A1/fr

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
    • H05B3/02—Details
    • H05B3/04—Waterproof or air-tight seals for heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/146—Conductive polymers, e.g. polyethylene, thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
    • B29C2045/1659—Fusion bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0005—Conductive
    • 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
    • H05B2203/021—Heaters specially adapted for heating liquids

Definitions

  • the invention relates to a method for producing a material connection between a heating element, which contains an electrically conductive plastic material, and a housing made of a plastic material. Furthermore, the invention relates to a material connection between a heating element and a housing and to the use of the method for producing a material connection between a housing and a flat tank, filter or delivery module heating element of an exhaust gas aftertreatment system.
  • the heating element comprises at least one thermoelectric heating element, the heating element being formed at least partially with a conductive material and being supplied with electrical energy via at least two conductor tracks.
  • the conductor tracks are formed using a thermal spraying process.
  • the thermally sprayed conductor tracks there is a good electrical connection between the conductor tracks and the conductive particles within the matrix of the conductive material of the heating element.
  • a variety of three-dimensional shapes can be imparted to the heater, resulting in a variety of applications for the heating element.
  • the heating element can be in the form of a tubular fluid line, so that the heating element, in addition to its actual heating function, also fulfills other structurally specified tasks. Due to the functional integration or dual functionality, this heating element results in significant design simplifications and optimization possibilities.
  • WO 2009/077269 A1 relates to a multi-component injection-moulded part with an integral seal.
  • Injection molded components can have a thermoplastic insert and a thermoplastic composite element sprayed onto the insert, the at least one insert having a plurality of elevations arranged one behind the other in the melt flow direction and designed as melting tips at its interface with the composite element.
  • the injection molded part is produced by an injection molding process in which the insert is placed in an injection mold and a composite element is injected therein.
  • the elevations should be melted by the melt of the composite element, resulting in a material-to-material, gas-tight connection.
  • the at least one ridge has a first slope on its melt flow upstream side, wherein the ratio of the height of a constricted cross-section to the height of the ridge is in the range between 0.6 and 0.9.
  • heating elements are used to heat bodies or media such as gases or liquids. These include ceramic PTC heating elements, metal resistance heaters or also resistance heaters based on electrically conductive plastics, as can be seen from DE 10 2012 212 798 A1. With the latter, surface heating elements can be implemented. In order to transfer the heat generated on the surface to another body that is also made of plastic material, such as a housing in which a medium to be heated or thawed is stored, the best possible connection between the two plastic materials is necessary .
  • the method proposed according to the invention makes it possible to save on other connecting elements that would otherwise be required to form a connection between the heating element and the housing, such as snap hooks, screw connections, clip connections or the like. Furthermore, the production of a material connection proposed according to the invention results in a plane, in particular a relatively large area that promotes heat transfer, between the components heating element and housing that are materially connected to one another.
  • the material connection is achieved by deformation of the melt structure and embedding deformed areas in the plastic material of the components to be joined.
  • the melting structure on the joining side of the heating element runs parallel to the current flow direction that occurs within the heating element, or the melting structure can alternatively run on the joining side of the heating element in the transverse direction to the current flow direction in the heating element.
  • the melt structure allows, be it parallel to the direction of current flow, be it transverse to the direction of current flow in the heating element running, a very good heat transfer between the materially bonded components heating element and housing.
  • the material connection between the heating element and the housing can be formed by the method proposed according to the invention in such a way that the deformed areas of the melted structure are evenly spaced from one another.
  • a uniform spacing produces a regularity in the sequence of deformed and smooth areas between the components, the heating element and the housing, which are bonded to one another.
  • a material connection can be produced to produce a material connection between a heating element, which contains a plastic material, and a housing, which contains an electrically conductive plastic material, with the following method steps being carried out: a) Generating a melting structure on a joining side of the housing during its shaping, b) overmolding the joining side with the plastic material of the heating element and c) melting the melting structure when carrying out b) and forming the material connection.
  • the invention also relates to an integral connection, produced according to the above method, between a heating element containing an electrically conductive plastic material and a housing made of a plastic material, with the fusion structure on a joining side of the heating element or of the housing being raised above the joining side protrudes.
  • the Fusing structure advantageously enables selective fusing of the fusing structure and the formation of a cohesive, sealing connection without air pockets between the parting line of the components to be cohesively connected to one another, in the present case the heating element and the housing.
  • the melting structure on the joining side is formed by a sequence of peaks, arches, webs, ribs, cylinders, cross webs or the like.
  • the materially bonded connection has a melting structure which runs as a regular pattern on the joining side parallel to a direction of current flow in the heating element or in a direction transverse to the direction of current flow within the heating element.
  • the invention relates to the use of the method for producing a material connection between a housing and a flat tank, filter or delivery module heating element of an exhaust gas aftertreatment system, in which a freezable reduction medium is used.
  • the solution proposed according to the invention makes it possible to save connecting elements between the components to be joined, namely the heating element and the housing. Commonly used connecting elements such as snap hooks, screws, clip connections or the like are eliminated, as are the associated assembly steps.
  • the solution proposed according to the invention makes it possible to achieve a contact surface in the region of a joint between the heating element and housing components that are to be cohesively connected to one another, which has evenly spaced connection points. As a result, the entire surface, ie the contact surface that results between the materially bonded components heating element and housing, is available for heat transport without this being adversely affected, for example, by air pockets occurring during the joining process.
  • the melt-on structure provided on the joining side of either the housing or the heating element which can be designed in any geometry, can be used to create punctiform melt-on points that result in deformed areas when the melt-on structure is overmolded with a flowable plastic material, which creates a tight and strong connection when it cools down arise in the area of the joint of the material connection between the materially bonded components.
  • a relatively high mechanical stability of the material connection between the materially joined components, namely the heating element and the housing can be achieved.
  • the heat-transferring surface is increased by the melt-on structure.
  • FIG. 1 shows a representation of a heating element with a melting structure
  • FIG. 2 an overmolding of the heating element according to FIG. 1 with a plastic material of a housing
  • FIG. 3 shows the plan view of a heating element as shown in FIG. 1,
  • FIG. 4 shows a mold filling of a mold for plastic material formed on a joining side of the heating element during the overmolding of the melt structure
  • FIG. 5 shows an enlarged representation of a deformed area of the melted-on structure in the area of the joint between the heating element and the housing
  • FIG. 6 shows schematic representations of raised geometries of the melting structure on the joining side of the housing or of the heating element.
  • FIG. 1 shows a side view of a heating element 10 which is made of a thermoplastic material, for example. 1, a first electrical contact 12 and a second electrical contact 14 run perpendicular to the plane of the drawing. The two electrical contacts 12, 14 run perpendicular to the plane of the drawing in the representation according to FIG. The representation according to FIG. 1 also shows that a melting structure 20 is formed on a joining side 18 of the heating element 10 .
  • Figure 2 shows an overmolding 26 of the melt structure 20 on the joining side 18 of the heating element 10.
  • the representation according to FIG. 2 shows that in the context of overmolding 26, the material of the melted-on structure 20 on the joining side 18 of the heating element 10 is covered by the plastic material 28, from which a housing 22 or a housing wall 24 is made.
  • the first electrical contact 12 and the second electrical contact 14 run parallel to one another in the direction of the plane of the drawing according to FIG Melting structure 20 when overmolding 26 the melting structure 20 with the plastic material 28 of the housing 22 or the housing wall 24, a material connection 30 results, in the present case an embedding of the geometry of the melting structure 20 in the plastic material 28 from which the housing 22 or the housing wall 24 is manufactured.
  • FIG. 3 shows a top view of the flat heating element 10 from the top.
  • the two electrical contacts 12, 14 run parallel to one another.
  • a current flow 36 occurs in the current flow direction 38 from the first electrical contact 12 to the second electrical contact 14 .
  • the current flow direction 38 runs in the longitudinal direction 52.
  • the melting structure 20 formed on the underside of the flat heating element 10, which is not shown in Figure 3, can either be in the form of a uniform pattern in the longitudinal direction 52 of the flat heating element 10 or perpendicular thereto, i. H. extend in the transverse direction 54 of the heating element 10 .
  • the flow of current 36 which occurs in the direction of flow of current 38 in the flat heating element 10, results in a flow of heat 32 to a medium 34 to be heated or thawed, such as a freezable operating/auxiliary material, such as is used in the context of SCR exhaust gas aftertreatment in exhaust gas aftertreatment systems for Exhaust gases from internal combustion engines are used.
  • a medium 34 to be heated or thawed such as a freezable operating/auxiliary material, such as is used in the context of SCR exhaust gas aftertreatment in exhaust gas aftertreatment systems for Exhaust gases from internal combustion engines are used.
  • FIG. 4 schematically shows a mold filling 42 of a mold 40, into which a flowable plastic material 28 is introduced in the direction of flow 44.
  • the housing wall 24 of the housing 22 is made from the flowable plastic material 28 as part of the overmolding 26 .
  • the illustration according to FIG. 4 shows that the plastic material 28 creeps into the mold 40 when the mold is filled 42, heating and deforming the geometry on the joining side 18, ie the melt-on structure 20. According to the direction of flow of the plastic material 28, the mold is completely filled 42 of the mold 40 in the direction of flow 44.
  • the material connection 30 is created between the melted-on structure 20 on the joining side 18 of the planar heating element 10 on the one hand and the plastic material 28 from which the housing wall 24 of the housing 22 is made , on the other hand.
  • Figure 5 shows a schematic, enlarged representation of a deformed area 50 of the melt-on structure 20 on the joining side 18 of the planar heating element 10.
  • the illustration according to Figure 5 shows that when the mold 40 is filled with the plastic material 28, the geometry of the melt-on structure 20 contains a deformation 46 .
  • the two components that are to be bonded to one another, heating element 10 and housing 22, claw together and form a sealing contact surface without air pockets, which enables excellent heat transfer between the two components that are bonded to one another, namely heating element 10 and housing 22 .
  • FIG. 6 shows, in a schematic manner, the melting structure 20 which is made on the joining side 18—in this case on the heating element 10 .
  • the fusion structure 20 generally comprises a regular pattern of tips 56, webs 58, ribs 60, cylinders 62, cross webs 64 or arcs 68.
  • the fusion structure 20, as shown in various geometric forms in Figure 6, can be on the joining side 18 of the heating element 10 as well as on the housing 22.
  • the melt-on structure 20 is provided on the joining side 18 of the flat heating element 10 made of electrically conductive plastic material, thermoplastic, which forms an integral connection 30 with the plastic material 28 of the housing 22 or the housing wall 24, another procedure can also be used to get voted.
  • the housing 22 can be produced first, on which melting points or the melting structure 20 are then formed and in a second step the plastic material 28 of the heating element 10 is cast as part of the overmolding 26 .
  • thermoplastic material 66 the heating element 10 and the housing 22 respectively;
  • previously used connecting elements such as snap hooks, screws, clip connections or the like can be saved, as can the associated assembly steps.
  • the solution proposed according to the invention creates a flat contact surface in the area of the joint 48 between the components to be joined, i. H. the flat heating element 10 on the one hand and the housing wall 24 or the housing 22 on the other hand.
  • a large number of deformed regions 50 which are spaced apart at regular intervals and are formed by the melted-on structure 20, can be formed so that as far as possible the entire surface between the components, heating element 10 and housing 22, which are materially bonded to one another, is available for heat transfer.
  • hot spots that may occur with temperatures that are too high and failures can be largely avoided.
  • the individual geometries of the melting structure 20, which are formed on the joining side 18 of either the heating element 10 or the housing 22 or the housing wall 24, can be designed both in the longitudinal direction 52 and in the transverse direction 54 to the current flow direction 38. Electrical isolation from the outside is also possible. This can be realized, for example, by a cover or encapsulation.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une liaison d'un seul tenant (30) entre un élément chauffant (10), qui contient une matière plastique électroconductrice, et un boîtier (22) en matière plastique (28). Les étapes de procédé suivantes sont effectuées : a) une structure de fusion (20) est d'abord produite sur un côté d'assemblage (18) de l'élément chauffant (10) lors de sa mise en forme ; b) le côté d'assemblage (18) est surmoulé (26) avec la matière plastique (28) du boîtier (22) ; et c) la structure de fusion (20) est fondue à mesure que l'étape b) est réalisée et la liaison d'un seul tenant (30) est formée. L'invention concerne également une liaison d'un seul tenant (30) entre un élément chauffant (10) et un boîtier (22) et l'utilisation du procédé pour produire une liaison d'un seul tenant (30) entre un boîtier (22) et un élément chauffant de réservoir plan, un élément chauffant de filtre ou un élément chauffant de module de distribution (10) d'un système de post-traitement de gaz d'échappement pour moteurs à combustion interne.
PCT/EP2021/069574 2020-08-27 2021-07-14 Procédé de liaison d'un seul tenant d'éléments chauffants à des éléments de boîtier en matière plastique WO2022042933A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020210815.3 2020-08-27
DE102020210815.3A DE102020210815A1 (de) 2020-08-27 2020-08-27 Verfahren zur stoffschlüssigen Verbindung von Heizelementen an Gehäuseelemente aus Kunststoff

Publications (1)

Publication Number Publication Date
WO2022042933A1 true WO2022042933A1 (fr) 2022-03-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/069574 WO2022042933A1 (fr) 2020-08-27 2021-07-14 Procédé de liaison d'un seul tenant d'éléments chauffants à des éléments de boîtier en matière plastique

Country Status (2)

Country Link
DE (1) DE102020210815A1 (fr)
WO (1) WO2022042933A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020043525A1 (en) * 2001-02-12 2002-04-18 Keith Laken Formable thermoplastic laminate heating tray assembly suitable for heating frozen food
WO2009077269A1 (fr) 2007-12-14 2009-06-25 Robert Bosch Gmbh Pièce moulée par injection à plusieurs composants présentant une étanchéité par liaison de matière
DE102012212798A1 (de) 2011-12-22 2013-06-27 Robert Bosch Gmbh Heizelement und Verfahren zu dessen Herstellung sowie Verwendung des Heizelementes
WO2018036990A1 (fr) * 2016-08-22 2018-03-01 Hamberger Industriewerke Gmbh Siège de toilettes ou abattant de toilettes
CN108927944A (zh) * 2017-05-27 2018-12-04 深圳富泰宏精密工业有限公司 壳体及该壳体的制作方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020043525A1 (en) * 2001-02-12 2002-04-18 Keith Laken Formable thermoplastic laminate heating tray assembly suitable for heating frozen food
WO2009077269A1 (fr) 2007-12-14 2009-06-25 Robert Bosch Gmbh Pièce moulée par injection à plusieurs composants présentant une étanchéité par liaison de matière
DE102012212798A1 (de) 2011-12-22 2013-06-27 Robert Bosch Gmbh Heizelement und Verfahren zu dessen Herstellung sowie Verwendung des Heizelementes
WO2018036990A1 (fr) * 2016-08-22 2018-03-01 Hamberger Industriewerke Gmbh Siège de toilettes ou abattant de toilettes
CN108927944A (zh) * 2017-05-27 2018-12-04 深圳富泰宏精密工业有限公司 壳体及该壳体的制作方法

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Publication number Publication date
DE102020210815A1 (de) 2022-03-03

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