DE7933844U1 - Thermal conduction device for electrical equipment - Google Patents

Description

SIEMENS AKTIENOESELLSCHAPT Our mark Berlin and Munich VPA

79 ₆ 6 7 2 f SRO

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The innovation relates to a heat conduction device for electrical devices in particular in communications technology, in which flat metal parts are detachable and thermally conductive are connected to each other. 5

To dissipate heat from components, for example many arrangements are known on circuit boards. However, they usually have the disadvantage that the assemblies are difficult to remove from the heat conductors « 10

The object of the innovation is to provide a device to facilitate the assembly and disassembly of heat sinks for components.

This object is achieved in the device of the type mentioned according to the innovation in that between the two-dimensional metal parts, an elastic plastic strip with a corresponding heat tolerance, encased in a film made of highly conductive metal is inserted.

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79 6 6 7 2 1 FRG

This gives you the advantage> that, for example, a heat-dissipating front panel only duroh pressing rests against a heat-conducting flag of the component generating the warning, for example when the door is closed Component or on its heat dissipation tab can be easily attached.

Further advantageous designs of the heat conduction device are contained in the lower claims *

The innovation is described below with reference to FIGS and 2 explained in more detail.

FIG. 1 shows a circuit board in section with a heat generating component. In the right salvation of the figure there is contact between a vortex flag and a heat sink with the interposition of the heat sink according to the invention shown »in the left hand without

Intermediate layer.

Figure 2 shows the design of the heat sink itself in plan view and in cross section.

A heat-generating component, for example a larger transistor 1, is mounted on a circuit board via spacers and a heat dissipation lug 2 made of sheet metal. This circuit board represents, for example, a plug-in or slide-in flat module of electrical communications engineering and contains the wiring in the usual printed design. Since the printed circuit board normally sits in a more or less airtight housing, the heat dissipation via the heat dissipation tab 2 is not sufficient in most cases.

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- 3 - VPA 79 6 6 7 2 1 BRD

You therefore need a larger heat sink, for example in the form of a massive heat sink with sew cooling fins arranged on the outside. In order to produce the thermal contact 2wisehen of the flag and the WMrmeableitkörper 4, the innovation according to the invention lies between the two Heat sink 5. The heat sink 4 can, for example, be a front panel that can be rotated or tilted Closes the housing and compresses the heat conductor 5 against the heat dissipation lug 2.

The heat conductor 5 consists of a plastic strip 6 Made of permanently elastic material of appropriate heat resistance, which is coated on one side with an adhesive layer is provided. This strip is made up of a foil 7 good heat-conducting material, such as copper, so surrounded so that their edges almost touch of the strip are covered with protective foil *

Ss must be avoided that the edges of the film also only partially overlap, so as fully as possible ♦ constant flat contact of the heat conductor on the one hand heat-emitting and on the other hand heat-dissipating Surface is ensured «The thickness of the film is It is advisable to choose so that the elasticity of the Plastic strip is only slightly restricted «advance» The design of the heat conductor in the form of a strip according to FIG large cable cross-section with a short cable path shows. One embodiment has a film of only 0.05 mm thick and 140 mm long, a wire cross-section of 14 mm.

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- 4 - VPA 79 6 6 7 21BRO

The heat conductor is attached by sticking it in the usual place »after removing the tendon foils.

The advantages of the heat conductor consist in simple production in the desired Örö0e, since suitable plastic strips with adhesive coating are commercially available are »furthermore low weight and small footprint, good effect due to large conductor cross-section with lsur2em conduction path, simple attachment and its Elasticity, the good contact regardless of tolerance guaranteed «

Se is useful for large heat-emitting surfaces instead of a wide arrester, several narrow arresters should be arranged side by side and the Multiply effect.

? Protection claims 2 figures

Claims (1)

- 1 - VPA 79 G 6 7 2 1 BRO claims for protection 1. heat conducting device for electrical equipment in particular telecommunications, are detachably and thermally conductively connected to one another in the planar metal parts characterized in that a cased with a film axis highly conductive metal elastic plastic strip is inserted with appropriate heat compatibility between the flat metal parts. 2. Heat conduction device according to claim 1, characterized in that the plastic 'strip is adhesive coated on one side. 3. Heat conduction device according to one of claims 1 or 2, characterized marked. net that the plastic strip rectangular profile and the film surrounds it almost completely. k. Heat conduction device according to one of the preceding claims, characterized in that the edges of the film strip in the middle of the longer flat sides of the plastic strip are folded over the plastic strip almost to the point of mutual contact and are glued to the plastic strip in the area of this surface. 5 * Heat conduction device according to one of the preceding claims, characterized in that the ends (8) not covered with metal foil are used for fastening on the flat metal part of the heat-generating component « ti ti <· · II f M t # j ι t IIII f I • »ι
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Il · · - 2 - VPA 79 G 6 7 2 1 BRQ 6. heat conduction device according to claim 4, characterized in that the other side of the Plastic strips with the continuous film under pressure on the thermally conductive metal part, e.g. in the form an easy-to-mount front panel with cooling fins. 7. heat conduction device according to claim 4, characterized in that the protruding Ends of the adhesive off-coated strip are covered with a protective film that when applied to the heat-emitting surface of the component is removable. 1 # ι I I I till III "