DE102009033987B4 - heating device - Google Patents

Abstract

Heating device with at least one electrical heating element, at least one heat-emitting panel (1) which has openings (2) through which a fluid to be heated can flow and which is thermally conductively connected to the at least one heating element, and a connection attachment (5 ) with electrical connections for the at least one heating element, one of these connections being a ground connection (12), characterized in that the ground connection (12) is designed as a slotted bolt which has two legs (12a), between which the heat dissipation panel (1 ) is inserted and clamped to the heat dissipation panel (1).

Description

The invention is based on a heating device with the features specified in the preamble of claim 1 . Such a heater with a formed from an extruded profile heat dissipation panel is from WO 2007/071335 A1 known.

• Die Heizleistung soll möglichst groß sein, damit der Fahrzeuginnenraum in möglichst kurzer Zeit aufgeheizt werden kann; die Fahrzeugheizung soll einschließlich der nötigen Anschlüsse möglichst klein und kompakt sein; die Fertigung soll möglichst kostengünstig und die Montage der fertigen Fahrzeugheizung soll mit möglichst geringem Aufwand möglich sein.

Such heating devices are used in particular for heating the interior of vehicles. When developing vehicle heaters, the following requirements must be observed:

• The heating output should be as high as possible so that the vehicle interior can be heated up in the shortest possible time; the vehicle heater, including the necessary connections, should be as small and compact as possible; the production should be as inexpensive as possible and the assembly of the finished vehicle heater should be possible with as little effort as possible.

From the DE 20 2007 001 079 U1 a vehicle heater is known which has a connection attachment with a connector receptacle which carries three contact tongues as potential connections and a ground bolt. The ground pin is attached by soldering or riveting to a contact sheet, which has openings through which heating rods are inserted and thus make contact with the contact sheet. With a suitable connector, this vehicle heater can be quickly and easily connected to the vehicle's electrical system; however, the production is expensive.

The object of the invention is to show a way of further simplifying the production of an electrical heating device, which should also be suitable in particular for automobiles.

This object is achieved by a heating device having the features specified in claim 1. Advantageous developments of the invention are the subject matter of the dependent claims.

A heating device according to the invention carries a connection attachment with electrical connections for the at least one heating element on one end face of the at least one heat-emitting panel, wherein at least one of these connections is a ground connection which is clamped to the heat-emitting panel. In this way, complex welding or soldering can be dispensed with and a ground connection can be implemented with little effort, which is suitable for a high current-carrying capacity and can be attached to the heat dissipation panel with little effort. A heating device according to the invention can therefore advantageously manage with a single ground connection, so that the heating device can be made very compact.

The connection attachment is preferably made of plastic. It is particularly preferred that the ground connection is injected into the connection attachment. In this way, the attachment of the connection attachment to the heat dissipation panel can advantageously be improved.

An advantageous development of the invention provides that the connection attachment forms a receptacle for a plug connector, in which the potential connections of the heating device are arranged. The ground connection as well as the potential connections can be contacted by a plug connector. However, it is also possible for the ground connection to be contacted separately. The potential connections are preferably arranged as contact tongues.

The at least one heat dissipation panel of a heating device according to the invention is preferably an extruded profile which has been provided with openings transversely to its extrusion direction. However, simple perforated metal sheets can also be used as heat dissipation panels, to which heating rods with heating elements contained therein can be attached, for example in a materially bonded manner, in particular by soldering or welding. An extruded profile which has heat-emitting ribs is preferably used as the heat-emitting panel.

According to the invention it is provided that the ground connection has two legs between which the heat dissipation panel is inserted. It is preferred that the legs of the ground connection have a greater width than the distance between two adjacent heat dissipation ribs. The legs preferably have a clamping effect on at least two heat dissipation fins. It is also possible to provide slots in the legs, through which heat dissipation ribs protrude, so that a base plate is clamped on both sides, from which the heat dissipation ribs emanate.

The connection attachment of a heating device according to the invention is preferably clamped to the at least one heat dissipation panel. An advantageous further development of the invention provides for the connection attachment to have clamping ribs. By means of clamping ribs, on the one hand, a sufficiently large clamping force can be exerted on the heat dissipation panel and, on the other hand, the contact surface between the connection attachment and the heat dissipation panel can be kept small. This is particularly advantageous when using a plastic connection attachment.

The clamping attachment of the connection attachment and the ground connection on the heat dissipation panel enables cost-effective production. The ground connection and the connection attachment can be plugged onto the heat dissipation panel in the same direction.

An advantageous development of the invention provides that the connection attachment has first clamping ribs, which cause a clamping force in a first direction, and second clamping ribs, which cause a clamping force in a second direction, with the second direction being transverse to the first direction and transverse to the extrusion direction is. In this way, a particularly reliable clamping of the heat dissipation panel can be achieved. It is preferred that the first clamping ribs extend parallel to the second clamping ribs. In this way, clamping and positioning can be effected at several points of the heat dissipation profile.

• 1 ein Ausführungsbeispiel einer erfindungsgemäßen Heizvorrichtung;
• 2 eine Seitenansicht des Anschlussaufsatzes der Heizvorrichtung;
• 3 der Anschlussaufsatz der Heizvorrichtung von oben;
• 4 eine Schnittansicht zu 3 entlang der Schnittlinie AA;
• 5 das Wärmeabgabepaneel der Heizvorrichtung mit Masseanschluss;
• 6: ein Detail einer Seitenansicht zu 5;
• 7 ein Detail einer Rückansicht zu 5,
• 8 eine weitere Ansicht des in 5 gezeigten Wärmeabgabepaneels mit Masseanschluss; und
• 9 ein weiteres Ausführungsbeispiel eine Masseanschlusses mit dem Wärmeabgabepaneel;
• 10 eine Schnittansicht zu 9 entlang der Schnittlinie BB;
• 11 eine Schnittansicht gemäß 10 eines weiteren Ausführungsbeispiels; und
• 12 eine Schnittansicht zu 1.

Further details and advantages of the invention are explained using exemplary embodiments with reference to the accompanying drawings. Identical and corresponding parts are marked with the same reference numbers. Show it:

• 1 an embodiment of a heating device according to the invention;
• 2 a side view of the attachment attachment of the heater;
• 3 the connection attachment of the heater from above;
• 4 a sectional view 3 along section line AA;
• 5 the heat dissipation panel of the heater with ground connection;
• 6 : a detail of a side view too 5 ;
• 7 a detail of a rear view 5 ,
• 8th another view of the in 5 grounded heat dissipation panels shown; and
• 9 another embodiment of a ground connection with the heat dissipation panel;
• 10 a sectional view 9 along section line BB;
• 11 a sectional view according to FIG 10 another embodiment; and
• 12 a sectional view 1 .

In the 1 The heating device shown has a heat dissipation panel 1 formed by an extruded profile, which has openings 2 running transversely to the direction of extrusion, through which a fluid to be heated can flow. The extruded profile 1 is made of aluminum, for example, and has a plurality of channels 3, three in the illustrated embodiment, running in the direction of extrusion, which are designed as tubes in the illustrated embodiment.

Electrical heating elements, preferably made of a PTC material, are arranged between the channel walls of these channels 3 . Heat dissipation ribs 4 of the heat dissipation panel run parallel to the channel walls, past which a fluid flow to be heated can flow. The heat dissipation ribs 4 have the same lengths as the channels 3 designed as tubes in which the heating elements are arranged.

The heat dissipation panel 1 is inserted with one end in a connection attachment 5, which carries electrical connections for the heating elements. On its opposite end face, the heat dissipation panel 1 is provided with a holder 6 for installing the heating device in a vehicle. The bracket 6 can be clamped to the heat dissipation panel 1 and has one or more pins 7 which engage in mounting holes provided for this purpose in a vehicle.

Plate-shaped PTC heating elements, which are not shown in the figures, are arranged in the channels 3 of the heat dissipation panel 1 designed as tubes. The heating elements are electrically contacted by a contact plate that is electrically insulated from the heat dissipation panel 1 . In order to improve the thermal coupling of the heating elements 8 to the heat dissipation panel 1, the rectangular tubes 3 can be pressed after the heating elements have been introduced.

The connection attachment 5 is clamped to the heat dissipation panel 1 and has a number of clamping ribs 10a, 10b, 10c for this purpose. The clamping ribs 10a, 10b, 10c run parallel to the heat dissipation ribs 4. When the connection attachment 5 is clamped onto the heat dissipation panel 1, plastic deformation of the clamping ribs 10a, 10b, 10c and/or the heat dissipation ribs 4 can occur.

In the exemplary embodiment shown, the connection attachment 5 has a clamping effect on the channel walls of the heat dissipation panel 1 .

For this purpose, the connection attachment has 5 in 4 shown clamping ribs 10a, 10b, 10c. First clamping ribs 10a exert a clamping force parallel to the direction of flow of a fluid stream to be heated. In the illustrated embodiment spiel press on the broad side of the rectangular cross section of the tubes 3 more, namely two, first clamping ribs 10a. The connection attachment 5 also has second clamping ribs 10b, which exert a clamping force transversely to the clamping direction of the first clamping ribs 10a. The second clamping ribs 10b have a clamping effect on the narrow sides of the rectangular cross section of the channels 3 designed as tubes.

The second clamping ribs 10b have a clamping nose which protrudes in the clamping direction and exerts the clamping force. In this way it is achieved that the second clamping ribs 10b only bear against the heat dissipation panel 1 with an advantageously small area and thus absorb less heat.

In the exemplary embodiment shown, the connection attachment 5 also has third clamping ribs 10c, which cause the heat-dissipating ribs 4 to be clamped.

The third clamping ribs 10c can also be provided with a clamping lug. It is also possible for the third clamping ribs 10c to lie flat against the heat-dissipating ribs 4 . Heat dissipation ribs that are further away from the heating elements have a lower temperature, so that a surface contact of clamping ribs 10c does not lead to heat absorption of the connection attachment 5, or only to an insignificant extent. If the connection attachment 5 contains electronic components, for example power semiconductors, an advantageous cooling of the electronic components can even be achieved by clamping ribs 10c lying flat against heat dissipation ribs 4 .

In order to make it easier to plug the connection attachment 5 onto the heat dissipation panel 1, the clamping ribs 10a, 10b, 10c have insertion bevels that run in the plug-in direction.

The connection attachment 5 has side walls 11 connected to one another, which enclose the end of the heat dissipation panel 1 which is inserted in it. The clamping ribs 10a, 10b, 10c only start from one side wall. The opposite side wall can be provided with small web-like elevations to compensate for tolerances. The ground connection 12 protrudes downwards over the side walls 11 . In this way, a large contact area between the ground connection 12 and the heat dissipation panel 1 is advantageously achieved. The ground connection 12 protrudes upwards over the connection attachment 5.

In the 2 until 4 the connection attachment 5 is shown in different views. The associated heat dissipation panel 1 with the ground connection 12 is in 5 shown.

The connection attachment 5 carries a ground connection 12, which has two legs 12a, between which the heat dissipation panel 1 is inserted. This ground connection 12 is particularly in the 6 until 8th to see a side and a rear view as well as a top view 5 show.

The legs 12a of the ground connection 12 clamp the heat dissipation panel 1. In the illustrated embodiment, the legs of the ground connection clamp two heat dissipation fins 4. The width of the legs is therefore greater than the distance between two adjacent heat dissipation fins 4. In this way, a ground connection is realized that a high current carrying capacity is suitable. In the illustrated embodiment, the ground connection 12 is designed as a bolt.

Legs 12a are formed by a longitudinal slot in ground connection 12 . The ground connection 12 is pushed onto the heat dissipation panel 1 in the same direction as the connection attachment 5 . The connection attachment 5 can be plugged onto the heat dissipation panel 1 before or after the ground connection 12 . It is also possible that the ground connection 12 is injected into the connection attachment 5 and is therefore injected onto the heat dissipation panel at the same time as the connection attachment 5 . The direction in which the ground connection 12 and the connection attachment 5 are plugged onto the heat dissipation panel 1 is the extrusion direction.

The ground connection 12 is preferably injected into the connection attachment 5 made of plastic. In this way, the ground connection 12 also contributes to the attachment of the connection attachment 5 to the heat dissipation panel 1 . How in particular 3 shows, the connection attachment 5 of the illustrated embodiment carries only a single ground connection 12 and a potential connection 13 for each of the channels 3 in which heating elements are arranged. Thus, three potential terminals 13 are present in the illustrated embodiment. The potential connections 13 are designed as contact tongues.

The connection attachment 5 forms a receptacle for a plug connector, so that the heating device can be connected to the vehicle electrical system with little effort. How in particular 4 shows, the ground connection 12 protrudes upwards from the connection attachment 5. The ground connection 12 is in particular longer than the potential connections 13. This has the advantage that the ground connection can protrude through a connector contacting the potential connections 13 and can be contacted separately, as can be seen from FIG DE 20 2007 001 079 U1 is known.

9 shows a further exemplary embodiment of how the ground connection 12 can be clamped to the heat dissipation panel 1 . the inside 9 Ground connection 12 shown is clamped between two adjacent heat dissipation fins 4 . In the simplest case, the clamped section of the ground connection 12 can be cylindrical, as is shown in 10 is shown. However, the section of the ground connection 12 that is clamped by the adjacent heat dissipation fins 4 preferably has a cross section that deviates from the circular shape. A particularly resilient clamping and, surprisingly, a contact surface suitable for high currents can be achieved in that the clamped section of the ground connection 12 has edges that are plastically deformed when pressed in between adjacent heat-dissipating ribs or heat-dissipating ribs are plastically deformed, thereby enlarging the contact surface.

12 shows a sectional view 1 along the cutting line EE. As already mentioned, the connection attachment 5 is clamped to the heat dissipation panel 1 . The connection attachment 5 has first clamping ribs 10a, which press on the wide side of the tubes 3, and second clamping ribs 10b, which have a clamping effect on the narrow sides of the tubes 3.

In addition, third clamping ribs 10c are provided, which act on the heat-emitting panel 1 between the heat-emitting ribs 4 . In the illustrated embodiment, these clamping ribs 10a, 10b, 10c start from the same side. The heat dissipation panel 1 is preferably held on two opposite sides by clamping ribs or clamping elements. In the illustrated embodiment, additional clamping elements 10d are therefore present, which clamp the heat dissipation panel 1 between themselves and the clamping ribs 10a, 10b, 10c. The clamping elements or clamping ribs 10d can be designed as very small elevations. A small height is sufficient to prevent the heat dissipation panel 1 from lying flat on the connection attachment 5 . In this way, extensive thermal decoupling of the connection attachment 5 from the heat dissipation panel 1 is advantageously achieved by the clamping ribs 10a, 10b, 10c, 10d.

reference list

1

heat dissipation panel

2

openings

3

channels

4

heat dissipation fins

5

connection attachment

6

bracket

7

cones

10a, 10b, 10c, 10d

clamping ribs

11

side walls

12

ground connection

12a

leg

13

potential connections

Claims (20)

Heating device with at least one electrical heating element, at least one heat-emitting panel (1), which has openings (2) through which a fluid to be heated can flow and which is thermally conductively connected to the at least one heating element, and a connection attachment arranged on a front side of the at least one heat-emitting panel (1). (5) with electrical connections for the at least one heating element, one of these connections being a ground connection (12), characterized in that the ground connection (12) is designed as a slotted bolt which has two legs (12a), between which the Heat dissipation panel (1) is inserted, and is clamped to the heat dissipation panel (1). heating device after claim 1 , characterized in that the ground connection (12) is injected into the connection attachment (5). Heating device according to one of the preceding claims, characterized in that the connection attachment (5) forms a receptacle for a plug connector, in which potential connections (13) of the heating device are arranged. Heating device according to one of the preceding claims, characterized in that the heat dissipation panel (1) is an extruded profile, the openings (2) running transversely to the direction of extrusion. Heating device according to one of the preceding claims, characterized in that the heat-emitting panel (1) has heat-emitting ribs (4). heating device after claim 5 , characterized in that the legs of the ground connection (12) clamp at least two heat dissipation fins (4). heating device after claim 5 , characterized in that the ground connection (12) is clamped by two adjacent heat dissipation fins (4). Heating device according to one of the preceding claims, characterized in that the heat-emitting panel (1) has a channel (3) in which the at least one heating element is arranged between channel walls. heating device after claim 8 , characterized in that the channel (3) is designed as a tube. Heating device according to one of the preceding claims, characterized in that the connection attachment (5) is clamped to the at least one heat-emitting panel (1). heating device after claim 10 , characterized in that the connection attachment (5) has clamping ribs (10a, 10b, 10c). heating device after claim 11 , characterized in that the clamping ribs (10a, 10b, 10c) are bevelled. heating device after claim 11 or 12 , characterized in that the connection attachment (5) has first clamping ribs (10a) which cause a clamping force in a first direction and second clamping ribs (10b) which cause a clamping force in a second direction, the second direction being transverse to the first direction is. heating device after Claim 13 , characterized in that the first clamping ribs (10a) extend parallel to the second clamping ribs (10b). heating device after Claim 14 , characterized in that the second clamping ribs (10b) have a clamping nose projecting in the second direction. Heating device according to one of Claims 8 until 14 , characterized in that the connection attachment (5) has a clamping effect both on a base plate of the heat dissipation panel (1), in which the openings (2) are arranged, and on at least one of the channel walls. Heating device according to one of Claims 10 until 16 , characterized in that the heat dissipation panel (1) is clamped on opposite sides of clamping elements (10a, 10b, 10c, 10d) of the connection attachment (5). Heating device according to one of the preceding claims, characterized in that the connection attachment (5) has side walls (11) which are connected to one another and which surround one end of the heat-emitting panel (1). heating device after Claim 18 , characterized in that the ground connection (12) protrudes downwards over the side walls (11). heating device after Claim 18 or 19 , characterized in that the ground connection (12) protrudes upwards from the connection attachment (5).

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