CN212544072U

CN212544072U - Electric heating device

Info

Publication number: CN212544072U
Application number: CN202020262225.5U
Authority: CN
Inventors: 迈克尔·尼德雷尔; 阿哈默德·阿萨菲; 凯-法比安·博克勒; 斯特凡·普雷尼亚
Original assignee: Eberspaecher Catem GmbH and Co KG
Current assignee: Eberspaecher Catem GmbH and Co KG
Priority date: 2019-12-27
Filing date: 2020-03-05
Publication date: 2021-02-12
Anticipated expiration: 2030-03-05
Also published as: DE202019005224U1

Abstract

The utility model relates to an electric heating device, has the casing of taking the partition wall, the partition wall will connect the cavity and separate with the heating cavity to export the heat, and the partition wall is protruding as the direction of heating rib towards the heating cavity from at least one PTC heating device, and PTC heating device has at least one PTC component and for supplying power for the PTC component that has different polarities and the conductor area of being connected with the PTC component is electrically conductive, and the conductor area realizes electrically conductive the connection in connecting the cavity to the entry and the exit joint that communicate with the heating cavity are outstanding from the casing for leading-in or deriving the medium that needs to heat, and entry and exit joint are outstanding from the bottom of casing, the bottom is put with the partition wall relatively.

Description

Electric heating device

Technical Field

The present invention relates to an electrical heating device having a housing with a partition wall which separates a connection chamber from a heating chamber in order to emit heat, and at least one PTC heating device protrudes as a heating rib from the partition wall in the direction of the heating chamber, wherein the PTC heating device has at least one PTC heating device and a conductor strip which is electrically conductively connected to the PTC element for energizing PTC elements of different polarity, which conductor strip is electrically connected in the connection chamber, and an inlet and outlet connection which communicates with the heating chamber and is used for introducing and discharging a medium to be heated protrudes from the housing.

Background

Such heating devices are known, for example, from EP 1872986 a1 or EP 2337425 a 1. Another similar type of electric heating device is known from EP 3334242 a 1. In this prior art, a PTC heating device with a heating housing which forms the heating ribs is first produced as a separate component, the heating housing is first formed as a separate component and is itself inserted into a heating receptacle formed on a partition wall, so that the connection-side end of the heating housing is accommodated in the heating receptacle of the partition wall in a sealed manner and the conductor strip is exposed with its free connection-side end in the connection chamber in order to be electrically connected there.

In the prior art mentioned above, the PTC heating device preassembled in this way is held in the heating receptacle in a friction-locking manner. For this purpose, the PTC heating device has a labyrinth seal formed by the heating housing, which is pressed into the heating receptacle.

According to the teaching of EP 1872986 a1 and EP 2337425 a1, the PTC heating device is inserted into the receiving pocket of the heating rib and is in thermally conductive contact with the inner face of the receiving pocket. The conductor strip projects beyond the receiving pocket in the direction of the connection chamber and is electrically connected there to a power current for supplying the PTC heating element. In this prior art, the heating ribs are integrally formed with the partition wall and project at right angles to the partition wall.

SUMMERY OF THE UTILITY MODEL

Based on this type of prior art, the object of the invention is to provide an electric heating device of the type mentioned at the outset which is of compact design and which makes possible a good connection for fluidically connecting the heating chamber to a line for feeding in or discharging a medium to be heated.

In view of this, the utility model provides an electric heating equipment. The electrical heating device has a housing with a partition wall which separates a connection chamber from a heating chamber in order to output heat and which projects from at least one PTC heating device as a heating rib in the direction of the heating chamber, the PTC heating device having at least one PTC element and a conductor strip which is connected to the PTC element in an electrically conductive manner in order to supply power to the PTC elements with different polarities, the conductor strip being connected in an electrically conductive manner in the connection chamber, and inlet and outlet connections which communicate with the heating chamber projecting from the housing for introducing or discharging a medium to be warmed, the inlet and outlet connections projecting from a base of the housing, which base is situated opposite the partition wall.

In the electric heating apparatus, the inlet and outlet fittings protrude from a bottom of the housing, which is opposite to the partition wall. Thus, in the electric heating device according to the invention, the lower side of the housing, which normally forms the standing surface of the heating device, forms the side of the housing where the fluid to be heated is brought into flow connection. In the above-mentioned prior art solutions, the inlet and outlet fittings respectively extend at right angles to the bottom face and project from the side surfaces of the housing. The fluid is then introduced into the heating chamber at right angles to the direction of extension of the heating ribs. On the contrary, the utility model provides a: the medium to be heated is introduced relative to the partition wall in a direction parallel to the height direction of the heating ribs. The inlet and outlet fittings extend at right angles to the partition wall.

The bottom of the housing typically forms the resting surface of the housing. In the case of the present invention, the starting point is also that the partition wall extends horizontally in the installed state of the electric heating device, in particular in a motor vehicle, so that, in particular in the solution known from EP 3334242 a1, additionally by fluid being spaced apart from the connection chamber, fluid is also prevented from entering the connection chamber.

Thus, according to the invention, the inlet and outlet connections of the heating device usually run through the placement section, the bottom of the electric heating device usually being attached to this placement section in the case of a motor vehicle being installed, so that the placement section of the electric heating device is supported in the gravitational field. Accordingly, such a rest has openings which accommodate the inlet and outlet connections in themselves. The rest provided on the chassis side can then be used to hold the electric heating device in the motor vehicle, also to guide the lines to the heating chamber and to accommodate the inlet and outlet connections.

The partition wall may be integrally formed with, for example, a housing portion constituting one or more heating chambers. The partition wall may be made of a material that is well heat insulating, such as a synthetic material. Alternatively and in order to improve EMV shielding, the housing parts surrounding the heating chamber may be formed from metal, in particular from cast metal, in particular aluminum. The heating chamber can also be inserted as a separate component into the housing or housing part and sealed off from the housing or housing part in order to prevent the medium from passing from the heating chamber into the connection chamber. The partition wall preferably extends parallel to the bottom, which makes it easy to assemble the electrical heating device in the aforementioned installation situation.

In order to heat the fluid well by flowing the fluid through as many PTC heating elements and/or heating ribs as possible in the heating chamber, according to a preferred development of the invention it is proposed that: the inlet and outlet fittings project from the base at opposite corners of the housing. Accordingly, the housing is flowed through as well in the longitudinal direction as in the transverse direction. In this case, the flow can be guided in a meandering manner, for example by the heating ribs deflecting the flow in the longitudinal direction of the housing, so that the fluid to be heated is guided on both sides through all the heating ribs.

In view of the most cost-effective production possible, it is preferred that the heating chamber is surrounded by a trough-shaped housing part which at least partially integrally forms the inlet and outlet connections. At least one heating rib projects as a separate component into the trough-shaped housing part. The heating ribs according to EP 3334242 a1 may be provided with a closed heating shell which usually itself forms the heating ribs. However, the heating ribs may also be formed integrally with the partition wall and project into the heating chamber, for example as is known from EP 1872986 a 1.

According to the above-discussed refinement, the channel-shaped housing part usually forms the inlet and outlet connections at least partially completely. The trough-shaped housing part is preferably formed from a synthetic material, for example by injection molding. The trough-shaped housing part can be connected to a further trough-shaped housing part, the edges of which surround the connection space and are connected in a sealing manner to the above-mentioned trough-shaped housing part. A plurality of heating ribs projecting into the heating chamber usually project from the further trough-shaped housing part in order to dissipate heat to the fluid to be heated there. All housing parts can be made of synthetic material and/or metal.

Drawings

Further details and advantages of the invention emerge from the following description of an embodiment with reference to the drawings. Wherein:

fig. 1 shows an embodiment of a heating device according to the invention in an exploded view.

Detailed Description

Fig. 1 shows an exemplary embodiment of an electric heating device having a multi-part housing, which comprises a lower housing part 102 made of a plastic material and an upper housing part 104 made of metal in one piece by means of die casting.

The housing lower part 102 is channel-shaped and encloses a heating chamber 106, the heating chamber 106 being provided with inlet and outlet connections 110 which project from a base 108. These inlet and outlet fittings 110 are integrally formed with the lower housing portion 102 by injection molding.

Inlet and outlet fittings 110 project from the base 108. The inlet and outlet fittings extend at right angles from the flat face formed by the base 108.

Between the housing upper part 104 and the housing lower part 102, a plurality of PTC heating devices 112 are shown in fig. 1, which have PTC elements arranged in the PTC heating devices 112, which are in electrically conductive contact via conductor tracks. The conductor strips are electrically connected by means of contact tongues 114. The PTC heating device 112 is held in an insertion contact manner in a receptacle 116 provided for this purpose of a partition wall 117 of the housing upper part 104. Details of this construction are described in the applicant's relevant EP 3334242 a 1.

Other elements of the heating device are shown between the lower housing portion 102 and the upper housing portion 104. A high-pressure plug element is designated by reference numeral 118, which is screwed to the housing lower part 104 and has contact elements which extend into a connection chamber 120 of the housing upper part 104. Such a contact element is electrically connected to a printed circuit board, designated by reference numeral 122, which can be accommodated in the channel-shaped housing upper part 104. A seal, indicated by reference numeral 124, seals the lower housing part 102 against the upper housing part 104, thereby sealing the heating chamber 106.

The holding member 126 provided with the elastic protrusion has heating device accommodating portions 128 that individually accommodate the respective PTC heating devices 112, respectively, and that engage with the outer peripheral surfaces of the respective PTC heating devices 112. In the assembled state, the holding element 126 is also connected to the housing lower part 104 in a form-fitting and/or force-fitting manner.

Arranged above the housing upper part 104 and below the printed circuit board 122 are contact devices 130, which electrically connect all the contact tongues 114 and group the individual PTC heating devices 112 into a heating circuit. An electrical connection between the contact device 130 and the printed circuit board 122 is established via contact pins 132 extending from the contact device 130. A control signal plug element is shown at 134 in connection with and protruding from the printed circuit board 122. The control signal plug element 134 is screwed to the printed circuit board 122.

Above the printed circuit board 122, a further circumferential seal 136 and a control housing cover 138 are shown, by means of which the connection chamber 120 of the housing upper part 104 is covered and sealed. The control housing cover 138 is formed of metal in order to shield the housing upper part 104 from electromagnetic radiation which is generated by the switching on of the power current in the control housing. A support backbone 140 is arranged between the control housing cover 138 and the printed circuit board 122, and a compression element 142 is supported between itself and the printed circuit board 122, for example, in order to press the power transistors mounted on the printed circuit board 122 against a cooling surface which is in heat-conducting connection with a cooling dome which extends into the heating chamber 106. The cooling surface is in heat-conducting connection with the power transistor.

After assembly, the connecting rod 144 engages behind locking projections which are provided on the housing lower part 102 and the housing upper part 104 in order to connect the housing lower part 102 and the housing upper part 104 to one another in a form-fitting manner without or with little loss. Details of this are described in EP 2796804a 1.

The control housing cover 138, together with the housing upper portion 104 and the seal 136, form a control housing 146. Here, the control housing cover 138 and the housing upper part 104 form a shield, due to their metallic material, around a control device 148 accommodated in a control housing 146, which is essentially formed by the printed circuit board 122. The connecting bolt 150 projects from the control housing 146 in the direction of the high-voltage plug element 118 and the control signal plug element 134 (from the inlet and outlet connection 110). The connecting bolt 150 is used to ground the metal control housing 146 and is screwed to the control housing 146.

List of reference numerals

102 lower part of the housing

104 upper part of the housing

106 heating chamber

108 bottom

110 inlet and outlet fittings

112 PTC heating device

114 contact tongue

116 accommodating part

117 separating wall

118 high-voltage plug element

120 connecting chamber

122 printed circuit board

124 seal

126 holding element

128 heating device receptacle

130 contact device

132 contact pin

134 control signal plug element

136 seal

138 control housing cover

140 supporting framework

142 compression element

144 connecting rod

146 control housing

148 control device

150 are connected to the bolt.

Claims

1. An electric heating device having a housing with a partition wall which separates a connection chamber from a heating chamber in order to emit heat and which projects from at least one PTC heating device as a heating rib in the direction of the heating chamber, the PTC heating device having at least one PTC element and a conductor strip which is connected in an electrically conductive manner to the PTC element for supplying power to the PTC element with different polarities, the conductor strip making an electrically conductive connection in the connection chamber, and inlet and outlet connections which communicate with the heating chamber projecting from the housing for the introduction or discharge of a medium which is to be heated,

the inlet and outlet fittings protrude from the bottom of the housing, which is located opposite the partition wall.

2. Electrical heating device as claimed in claim 1, characterized in that the bottom extends parallel to the partition wall.

3. An electrical heating apparatus in accordance with claim 1 or 2, wherein the inlet and outlet fittings project from the base at opposite corners of the housing.

4. An electric heating device as claimed in claim 1 or 2, characterized in that the housing has a channel-shaped housing part which integrally forms the inlet and outlet connections, the heating chamber being enclosed by said housing part, the PTC heating means projecting into said housing part as a separate component.

5. Electrical heating device as claimed in claim 4, characterized in that the trough-shaped housing part is formed from a synthetic material.

6. Electrical heating device as claimed in claim 1 or 2, characterized in that the bottom constitutes a flat resting surface from which the inlet and outlet connections protrude.