EP3866564A2 - Dispositif de chauffage électrique - Google Patents

Dispositif de chauffage électrique Download PDF

Info

Publication number
EP3866564A2
EP3866564A2 EP20216923.1A EP20216923A EP3866564A2 EP 3866564 A2 EP3866564 A2 EP 3866564A2 EP 20216923 A EP20216923 A EP 20216923A EP 3866564 A2 EP3866564 A2 EP 3866564A2
Authority
EP
European Patent Office
Prior art keywords
heating device
ptc
ptc heating
chamber
heating
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.)
Pending
Application number
EP20216923.1A
Other languages
German (de)
English (en)
Other versions
EP3866564A3 (fr
Inventor
Michael Niederer
Stefan Plewnia
Ahmad Asafi
Kai-Fabian Bürkle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Catem GmbH and Co KG
Original Assignee
Eberspaecher Catem GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eberspaecher Catem GmbH and Co KG filed Critical Eberspaecher Catem GmbH and Co KG
Publication of EP3866564A2 publication Critical patent/EP3866564A2/fr
Publication of EP3866564A3 publication Critical patent/EP3866564A3/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—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
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/0072—Special adaptations
    • F24H1/009—Special adaptations for vehicle systems
    • 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
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • F24H9/1827—Positive temperature coefficient [PTC] resistor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material
    • H05B2203/023—Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system

Definitions

  • the present invention relates to an electrical heating device with a housing with a partition that separates a connection chamber from a heating chamber for the emission of heat and from which at least one PTC heating device protrudes as a heating rib in the direction of the heating chamber, the PTC heating device at least one PTC -Element (12) and for energizing the PTC element with different polarity with this electrically conductively connected conductor tracks which are electrically connected in the connection chamber.
  • Such a heating device is, for example, off EP 1 872 986 A1 or EP 2 337 425 A1 famous.
  • Another electrical heating device of the same generic type is from EP 3 334 242 A1 famous.
  • the PTC heating device with a heating housing that forms the heating rib is initially produced as a separate component and as such is inserted into a heating receptacle that is formed on the partition, so that the connection-side end of the heating housing is sealed in the Heating receptacle of the partition is added and the conductor tracks are exposed with their free, connection-side ends in the connection chamber in order to be electrically connected there.
  • the PTC heating device preassembled in this way is held in the heating receptacle with a friction fit.
  • the PTC heating device has a labyrinth seal formed by the heating housing, which is pressed into the heating receptacle.
  • the PTC heating device is inserted into a receiving pocket of the heating rib and contacted in a thermally conductive manner with the inner surfaces of the receiving pocket.
  • the conductor tracks protrude beyond the receiving pocket in the direction of the connection chamber and are there electrically connected to the power current for energizing the PTC heating element.
  • the heating rib is molded in one piece with the partition and protrudes at right angles to the partition.
  • the present invention proposes an electric heating device with the features of claim 1.
  • the present invention provides an electrical heating device with the features of claim 1.
  • the electrical heating device is preferably an electrical heating device for a motor vehicle.
  • the housing is usually a housing designed to be suitable for heating a liquid medium, which has inlet and outlet connections for this purpose, but otherwise seals the heating chamber.
  • the partition wall usually separates the connection chamber from the heating chamber in a fluid-tight manner. The partition is penetrated by an upper end of the PTC heating device.
  • PTC heating devices are provided which protrude into the heating chamber as heating ribs.
  • the end of the PTC heating device protruding into the connection chamber usually comprises contact tongues that are electrically contacted in the connection chamber, for which purpose a contacting device is preferably provided that combines the different PTC heating devices by grouping the contact tongues into heating circuits and is provided with contact tongues that are in the alignment of the contact tongues of the PTC heating devices protrude into an assembled circuit board.
  • This populated circuit board controls the power current for heating the PTC heating device and usually forms a control device.
  • the electrical heating device has a substantially rectangular base area when viewed from above on the partition, i.e. a visual axis substantially at right angles to the partition.
  • essentially means that the base can have rounded edges and soft contours, which favor the flow conditions within the heating chamber and prevent unnecessary flow resistance.
  • the base area is approximately rectangular, it being possible for bulges or the like to protrude laterally over this base area.
  • the PTC heating devices are arranged in an oblique orientation relative to the rectangular round surface.
  • the PTC heating devices preferably extend at an angle of 45 ° +/- 15 °.
  • the PTC heating devices basically have an elongated rectangular shape in a cross-sectional view.
  • Each other Opposite main side surfaces of the PTC heating devices which bear against the corresponding main side surfaces of the PTC element in a thermally conductive manner, form the main surfaces of the PTC heating device.
  • These main side surfaces are connected by end faces, which in relation to the main side surfaces in a cross-sectional view of the PTC heating device a have a relatively small extension.
  • the main side surfaces of the PTC heating device are defined by a width in a cross-sectional view of the PTC heating device.
  • the front side has a thickness.
  • the direction of longitudinal extent of the PTC heating device runs at right angles to the plane spanned by the width and the thickness.
  • the PTC heating device usually protrudes from the partition wall in this longitudinal direction.
  • the inclined alignment of the PTC heating devices relative to the base area leads to a more compact design of the electrical heating device.
  • the PTC heating devices can have a width that is greater than the width of the rectangular heating chambers, and even leave a passage at the end face, through which the fluid to be heated from a flow channel between adjacent PTC heating devices to the next channel between adjacent PTC heating devices.
  • the PTC heating devices are aligned parallel to one another in plan view.
  • flow channel sections with a constant width accordingly result between the individual PTC heating devices.
  • a preferred development of the present invention proposes providing the corresponding inlet and outlet openings to the heating chamber in diagonally opposite corners of the base area.
  • the housing surrounding the heating chamber is preferably concave in plan view.
  • This concave area delimits a flow channel section which is formed between two PTC heating devices.
  • the fluid to be heated is thus deflected at the end of the inflow channel over the concave shape of the outer boundary formed by the housing with little loss in order to reach the next flow channel section.
  • the PTC heating device preferably directly adjoins an edge surface which is formed by the housing and delimits the heating chamber.
  • a receptacle with a C-shaped cross-section, which receives an end face of the PTC heating device, preferably protrudes from this edge surface.
  • This C-shaped receptacle which also forms the walls delimiting the heating chamber, usually merge continuously and step-free into the surface of the PTC heating device, regularly into the main side surfaces of the same. This also reduces the flow resistance within the heating chamber.
  • a lower housing part of the housing that essentially surrounds the circumference of the heating chamber is preferably formed from a plastic.
  • an electrical heating device with the features of claim 6 in the preamble.
  • Such an electrical heating device does not necessarily have, but preferably, a base area that is rectangular in plan view.
  • the electrical heating device specified according to the secondary aspect has PTC heating devices, each of which is plug-contacted in a receptacle formed on the partition, as is basically the case EP 3 334 242 A1 is known.
  • the PTC heating devices are supported with their end opposite the receptacle on a floor opposite the partition wall. Plug-contacted PTC heating devices provided one behind the other are alternately assigned to mutually opposite edge surfaces of the heating chamber, so that a meandering flow channel is formed in the heating chamber.
  • Such a flow guidance improves the heat dissipation from the PTC heating devices.
  • the medium to be heated is inevitably guided past the main side surfaces of the PTC heating devices and through the respective sections of the flow channel.
  • the PTC heating devices are in any case preferably formed as PTC heating devices plug-contacted in a receptacle formed by the partition.
  • the bottom of the lower housing part With a view to good positioning in the heating chamber, it is proposed according to a preferred development of the present invention to provide the bottom of the lower housing part with at least one conically tapering indentation per PTC heating device. This indentation is used to position a free end of the PTC heating device.
  • the PTC heating devices are first inserted into the receptacles in the partition and then the lower housing part is placed against an upper housing part that forms the partition to complete the heating chamber, then the PTC heating device is positioned by one, usually by several tapering indentations per PTC heating device as part of the joining movement of the lower part of the housing and the upper part of the housing.
  • the base has a longitudinal groove that receives the free end of the PTC heating device.
  • This longitudinal groove not only positions the PTC heating device. It also prevents the fluid to be heated from being on the side opposite the partition wall at the free end of the PTC heating device flows past without being heated sufficiently. Because due to the self-regulating properties of the PTC elements, good heat dissipation is essential for operating the PTC heating devices with good efficiency.
  • the indentation can also be provided in the longitudinal groove.
  • the PTC heating device can have a locking web provided on its underside which engages in the longitudinal groove and interacts with the indentation for centering the PTC heating device.
  • the Figure 1 shows an exemplary embodiment of an electrical heating device 100 with a multi-part housing which comprises a lower housing part 102 made of plastic and an upper housing part 104 made in one piece from metal by means of die-casting.
  • the lower housing part 102 is trough-shaped and encloses a heating chamber 106, to which inlet and outlet nozzles 110 protruding from a base 106 are provided. These inlet and outlet nozzles 110 are molded in one piece with the lower housing part 102 by means of injection molding.
  • the inlet and outlet nozzles 110 protrude beyond the base 108. They extend at right angles from a flat surface formed by the base 106.
  • PTC heating devices 112 are shown in the figure, which have PTC elements provided within the PTC heating devices 112, which are electrically contacted via conductor tracks.
  • the conductor tracks are electrically connected via contact tongues 114.
  • the PTC heating devices 112 are held with plug-in contact in receptacles 116 provided for this purpose in a partition 117 of the upper housing part 104. Details of this refinement can be found in that which goes back to the applicant EP 3 334 242 A1 described.
  • a high-voltage plug element is identified by reference numeral 118, which is screwed to the lower housing part 104 and which has contact elements protruding into a connection chamber 120 of the upper housing part 104. These contact elements are electrically connected to a printed circuit board, identified by reference numeral 122, which can be received in the trough-shaped upper housing part 104.
  • a seal is identified by reference numeral 124, which seals the lower housing part 102 from the upper housing part 104 and thus seals off the heating chamber 106.
  • a holding element 126 provided with elastic projections has heating device receptacles 128 which each receive the individual PTC heating devices 112 and which claw with the outer circumferential surface of the individual PTC heating devices 112. In the assembled state, the holding element 126 is also connected to the lower housing part 104 in a form-fitting and / or force-fitting manner.
  • a contacting device 130 is arranged above the upper housing part 104 and below the printed circuit board 122, which connects all contact tongues 114 electrically and groups individual PTC heating devices 112 to form heating circuits.
  • An electrical connection between the contacting device 130 and the printed circuit board 122 is established via contact tongues 132 protruding from the contacting device 130.
  • a control signal plug-in element is shown with reference numeral 134. This control signal plug-in element 134 is screwed against the printed circuit board 122.
  • a further circumferential seal 136 and a control housing cover 138 are shown above the circuit board 122, by means of which the connection chamber 120 of the upper housing part 104 is covered and sealed.
  • the control housing cover 138 is made of metal in order, together with the upper housing part 104, to shield electromagnetic radiation that is generated by switching the power current within the control housing 104, 136, 138.
  • a support frame 140 is arranged between the control housing cover 138 and the circuit board 122, the Compression elements 142 are supported between them and the circuit board 122 in order, for example, to press power transistors mounted on the circuit board 122 against cooling surfaces which are connected in a thermally conductive manner to cooling domes extended into the heating chamber 106. The cooling surfaces are connected to the power transistors in a thermally conductive manner.
  • connecting rods 144 engage behind locking projections 145, which are provided on the lower housing part 102 and the upper housing part 104 in order to connect the two parts 102, 104 to one another in a form-fitting and captive manner. Details are in the EP 2 796 804 A1 described.
  • control housing cover 138 together with the upper housing part 104 and the seal 136, forms a control housing 146. Because of their metallic materials, the control housing cover 138 and the upper housing part 104 form a shield around the control device 148, which is accommodated in this control housing 146 and which is essentially formed by the printed circuit board 122.
  • a connecting bolt 150 protrudes from the control housing 146 in the direction of the plug-in elements 118, 134 support 110. This connecting bolt 150 is used to connect the metallic control housing 146 to a ground phase and is screwed to the control housing 146.
  • FIG. 2-7 is the in Fig. 1 PTC heating device marked with reference numeral 112 and marked with reference numeral 600; this in Figure 1
  • the lower housing part marked with reference numeral 550 is in the Figures 2 ff with reference numeral 550 .
  • the PTC heating device 600 has opposite main side surfaces 602, which each delimit flow channel sections 552 of a flow channel S within the heating device 100, in which the liquid medium to be heated is guided.
  • the main side surfaces 602 define the width b of the PTC heating device 600.
  • the PTC heating devices 600 are each placed against mutually opposite edge surfaces 554 of the lower housing part 550.
  • the lower housing part 550 simulates a cross section there Fig.
  • each first PTC heating element 600 is in Figure 5 on the upper edge surface 554, every second PTC heating element 600 on the lower edge surface 554 of the lower housing part 550.
  • a cooling dome 512 which is connected to a power transistor 308 in a thermally conductive manner, is located opposite the end face 606 opposite thereto.
  • one of the power transistors 308 lies on a cooling surface 510 that is exposed in the connection chamber 120 which forms the connection-side end of the cooling dome 512.
  • An inner surface 516 of the cooling dome 512 covers the corresponding end face 606 of the PTC heating device 600 in the shape of a roof.
  • Fig. 5 The illustrated embodiment of the PTC heating devices 600 and their arrangement relative to the edge surfaces 554 of the lower housing part 550 results in a meandering flow channel S through the heating chamber 106.
  • This flow channel S guides the fluid into it Fig. 5 leads from a widened inlet 608 (top left) to a widened outlet 610 (bottom right).
  • the medium to be heated sweeps over all main side surfaces 602.
  • Fig. 5 In the area of the outlet 610, the tip of a temperature sensor identified by reference numeral 400 can be seen, which measures the outlet temperature of the fluid to be heated and controls the heating output accordingly.
  • the C-shaped receptacle 556 is shaped such that a slot 558 extending in the longitudinal direction L of the PTC heating device is formed between the end face 606 and the surface of the C-shaped receptacle lying opposite it. This serves to compensate for tolerances, since the PTC heating device 600 may be subject to dimensional and shape fluctuations on its end face due to the manufacturing process, but on the other hand should be received in the receptacle 584 as fluid-tight as possible.
  • the slot 586 also allows a certain spreading of the C-shaped receptacle 584, so that the two legs of the C-shaped receptacle 584 can rest against the PTC heating device 600 from the outside.
  • the lower housing part 550 is made of plastic.
  • the heating chamber 106 has a substantially rectangular cross section in the top view shown.
  • the PTC heating devices 600 are aligned obliquely so that the width of the heating chamber 106 (in the height direction of the Fig. 5 ) is less than the width of the PTC heating devices 600.
  • the PTC heating devices are inclined by approximately 30 to 50 °. This results in a more compact construction of the electrical heating device.
  • the PTC heating devices 600 are, however, aligned so as to run parallel to one another in order to form flow channel sections 552 which each extend in parallel and have the same width.
  • the inlets and outlets 608, 610 are located in the base area G shown in dash-dotted lines.
  • the base area G has a width B and a length LA.
  • the PTC heating devices 600 are plugged into the receptacles 116.
  • the PTC heating devices 600 protrude with their contact tongues 114 into the connection chamber 106 and are there electrically connected to the contacting device 130, which combines the different PTC heating devices 600 and their contact tongues 114 in heating circuits.
  • the contacting device 130 is in turn electrically connected to the printed circuit board 122, which forms the control device 148 of the exemplary embodiment.
  • the lower housing part 550 has a bottom 560 in which a longitudinal groove is recessed, which in the Figures 6 and 7th is identified by reference numeral 562.
  • the negative shape of the respective longitudinal groove 562 is shown in FIG Figure 3 to be recognized and identified there with reference numeral 563.
  • This negative form 563 can also be used in the Figures 3 and 4th recognize the formation of the longitudinal grooves 562 on the base 560.
  • a lower free end of the PTC heating device 600 identified by the reference number 612 is provided with a locking web 614 which interrogates in the longitudinal direction L at the bottom of the PTC heating device 600. This locking web 614 engages in the longitudinal groove 562, as a result of which the flow channel S is essentially sealed at the lower end of the PTC heating device 600 (cf. Figure 4 ).
  • indentations 564 on both sides of the longitudinal groove 562, which taper conically in the direction of the bottom of the longitudinal groove 562 and are arranged in the longitudinal groove 562.
  • Fig. 5 Furthermore, the design of the heating chamber 106, which is favorable in terms of flow technology, can be seen. This avoids rectangular flow cross-sections or angular transitions. Opposite the cooling domes 512, the edge surfaces of the lower housing part 550 are concave so that the flow is transferred from one flow channel 552 to the next at the free end surfaces 606 of the PTC heating devices 600 with little loss. All diversion points in the in Figure 5 The upper part of the heating chamber 106 is formed by a cooling dome 512 in each case.
  • the PTC heating devices 600 are each inserted into receptacles 116 assigned to them, which are recessed in the partition 117. Due to a sealing support formed on the housing of the PTC heating device 600, the PTC heating device is sealed in a fluid-tight manner in this receptacle 116. Only the contact tongues 114 protrude into the connection chamber 120 and are electrically connected there. The frictional engagement of the PTC heating devices 600 in the receptacle 116 is sufficient in any case within the scope of handling during assembly in order to hold the PTC heating devices 600 on the upper housing part 104.
  • the lower housing part 550 is then mounted.
  • the lower housing part 550 is advanced in the direction of the upper housing part 104.
  • the locking web 614 is received between the indentations 564 and, due to the conical design of the indentations 564, aligned and centered parallel to the longitudinal groove 562 during further feed movement.
  • the locking web 614 is received in the longitudinal groove 562.
  • the PTC heating devices 600 have a width b, the dimension of which is greater than the width B of the base G.
  • the PTC heating devices 600 are each aligned obliquely to the boundary lines of the base G at an angle of approximately 45 °.
  • the inclination also allows a slightly parallelogram-like distortion of the base area G, so that laterally next to that of the heating chamber 106 in the plan view Figure 5 occupied area the plug-in elements 118, 134 can be provided for contacting the power current or the control current.
  • the embodiment is then built compact.

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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)
EP20216923.1A 2019-12-27 2020-12-23 Dispositif de chauffage électrique Pending EP3866564A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019220590 2019-12-27

Publications (2)

Publication Number Publication Date
EP3866564A2 true EP3866564A2 (fr) 2021-08-18
EP3866564A3 EP3866564A3 (fr) 2021-10-13

Family

ID=73857057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20216923.1A Pending EP3866564A3 (fr) 2019-12-27 2020-12-23 Dispositif de chauffage électrique

Country Status (1)

Country Link
EP (1) EP3866564A3 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1872986A1 (fr) 2006-06-28 2008-01-02 Catem GmbH & Co. KG Chauffage électrique
EP2337425A1 (fr) 2009-12-17 2011-06-22 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique et élément produisant de la chaleur d'un dispositif de chauffage électrique
EP2796804A1 (fr) 2013-04-26 2014-10-29 Eberspächer catem GmbH & Co. KG Boîtier scellé et procédé destiné à sa fabrication
EP3334242A1 (fr) 2016-12-06 2018-06-13 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2440006B1 (fr) * 2010-10-08 2015-02-25 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique
DE102011054406B4 (de) * 2011-09-30 2013-05-23 Borgwarner Beru Systems Gmbh Elektrische Heizvorrichtung zum Beheizen von Flüssigkeiten
EP3273177B1 (fr) * 2016-07-18 2020-09-09 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique
EP3772867B1 (fr) * 2019-08-06 2023-05-03 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique et son procédé de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1872986A1 (fr) 2006-06-28 2008-01-02 Catem GmbH & Co. KG Chauffage électrique
EP2337425A1 (fr) 2009-12-17 2011-06-22 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique et élément produisant de la chaleur d'un dispositif de chauffage électrique
EP2796804A1 (fr) 2013-04-26 2014-10-29 Eberspächer catem GmbH & Co. KG Boîtier scellé et procédé destiné à sa fabrication
EP3334242A1 (fr) 2016-12-06 2018-06-13 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique

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