DE102009007612A1 - Heat dissipation device for e.g. LED display, of motor vehicle, has metal strip with lamella section consisting of lamellas, and pins provided in fastening section and fixed in opening of base plate in force-fit manner - Google Patents

Abstract

The device (1) has a curved meander-shaped metal strip (3) with a lamella section (4) consisting of multiple lamellas (5) and a fastening section (6). A base plate (2) and the metal strip are connected with each other in a heat conducting manner. Pins (7) are provided in the fastening section, and are fixed in an opening (8) of the base plate in a force-fit manner. The lamellas are connected with each other in a region of the fastening section by a lamella belt. The metal strips are interlaced in to each other. An independent claim is also included for a method for manufacturing a heat dissipation device.

Description

The The present invention describes a device for cooling electronic components and a method for producing these Contraption.

Dependent their efficiency also occurs with electronic components always to a heat development. Especially because of growing demands for size reduction of electronic Devices and the associated high density of integration the individual components results in the need for heat dissipation. However, the required device does not have to ensure only a good heat dissipation, but also both the lowest possible weight and small size as well as have minimal production costs.

conditioned The current environmental legislation will make cold cathode tubes in display instruments and display lights currently in motor vehicles more and more replaced by LEDs (Light Emitting Diode). To one to achieve sufficient brightness are powerful LED's in sufficient number necessary. Due to the constructive limited Arrangement results in a very small space a high heat output, which greatly limits the life and function of the LEDs. Comparable heat problems also arise during use a powerful OLED display (Organic Light Emitting Diode). Therefore, suitable measures for heat dissipation be provided. The straight in the instruments and displays in Vehicles very limited space needs the best possible be used to deliver the heat to the environment.

in the In general, metal blocks made of profiles or made of cast iron with milled or molded cooling fins used for surface enlargement. The disadvantages of these heat sinks are the comparatively high weight, the elaborate production by milling or Casting with post-processing and by the manufacturing process conditional, not always optimal adaptation to the installation space. Further Disadvantages are the complex tool production with master model and Molding, as well as an environmentally harmful production in one Casting process.

Therefore, such cooling elements are often produced by extrusion of base plates and individual cooling fins of a good heat conducting metal, as it is in the DE 198 06 978 B4 is described. The individual cooling fins are usually perpendicular to the surface of the base plate, wherein the distance between these fins to each other for manufacturing reasons does not fall below a minimum distance. An enlargement of the heat exchange surface can be achieved by introducing additional cooling elements between the individual lamellae.

From the DE 203 09 856 U1 In this context, a heat sink is known in which individual cooling elements are secured in grooves of the base plate by gluing. Depending on the shape of these cooling elements, the heat sink can be adapted to the shape of the electrical component. However, the bonding requires an additional step. Further, between the cooling elements and the heat-dissipating base plate, an uneven heat transfer resistance, which is increased by the adhesive as a whole.

The DE 600 35 255 T2 describes to solve a uniform heat transfer a device consisting of three different components. This includes a heat sink with a cooling fin, a base plate and a fitting element. In slots of the base plate mountain-shaped sections of the heat sink are introduced. In order to ensure a uniform heat transfer between these two elements, as a third component acting as an additional fastening element Einpasselement is provided, which is mounted so that the base portions of the heat sink between the fastener and the base plate are. The fastener and the base plate are secured by additional connectors. However, this form of attachment includes the frictional connection of heat sink and base plate, a third component, which requires additional costs and manufacturing steps. Furthermore, the Einpasselement heats up and thus holds the heat at least in its vicinity. In addition, due to the Einklammerung of the heat sink between the base plate and fastener not every lamellar characteristic can be realized.

task The present invention is therefore an apparatus for cooling to develop electronic components that are uniform Heat dissipation at the same time low construction costs and high Design flexibility ensured.

This object is achieved with the features of claims 1 and 9. According to the invention a device for heat dissipation is provided consisting of a bottom plate and at least one bent sheet-metal strip with a fin section with a plurality of fins and a mounting portion, wherein the bottom plate and the metal strip are thermally conductively connected to each other. In order to produce the device easily and to achieve a great deal of flexibility in the utilization of the available space for heat dissipation, it is proposed according to the invention that in the attachment portion pins are formed, which are fixed non-positively in openings of the bottom plate. As cones are in particular of to view the projections of the bottom plate facing side of the slats protruding. The base plate facing the underside of the fins with the pin thus forms the attachment portion.

According to one technically simple and very reliable frictional Connection are the pins in the openings of the bottom plate riveted.

A Alternative frictional attachment provides that the pins in the openings of the bottom plate frictionally are inserted, preferably by the openings in proportion have an undersize to the outer circumference of the pins. In this case, it is even possible to use the sheet metal strip with the Slats without additional tools on the bottom plate it has been found in practice that a sufficiently reliable connection is made.

Yet can be provided according to the invention, that the Pins are glued in the openings of the bottom plate. As an adhesive is preferably an adhesive with good heat conducting Properties used. This adhesive can be used, for example, in the frictional connection remaining free space close and so next to an additional fuse the non-positive connection and the heat transfer between the sheet metal strip with the fins and the bottom plate improve.

According to one Embodiment of the present invention is the sheet metal strip including the lamella and the attachment section meandering curved. There can be two adjacent lamellae in particular U-shaped in each case by means of a Lamella web to be interconnected. A preferred embodiment is that adjacent lamellae are parallel or substantially parallel, d. H. with an angle in particular less than 5 ° relative each other, are aligned. Relative to the amount of Slats, the lamella webs are formed lower, preferably maximum up to a quarter of the height of the slats. On this way a draft between the slats is made possible, which ensures a better cooling effect.

According to one alternative embodiment of the present invention are the lamellae of the metal strip in the region of the mounting portion on the opposite sides of the slats over a slat band connected together. The slat band limited the sheet metal strip thus side, with the slats on the slat strip bent over and are preferably placed perpendicular thereto, without the invention being limited to this orientation. Thus, it is possible, the lamellae flexible to the Adjust available space. The inventively proposed Slat band serves in particular a common assembly of all Slats on the bottom plate, leaving the slat band after assembly the individual slats can also be separated from these.

at This embodiment can also be used according to the invention several metal strips nested inside each other be to improve the overall cooling effect. To the lamellar bands are preferably placed on top of each other, wherein the slats of the two metal strips offset from one another are arranged. The nested metal strips are preferably constructed identically.

According to one preferred embodiment of the invention is provided that the bottom plate of the device for heat dissipation simultaneously a housing surface of an electronic device, especially a display with LED or OLED lighting forms. By the bottom plate of the device for heat dissipation simultaneously a housing wall is no unnecessary Requested space and unnecessary weight avoided. Furthermore, will an optimal heat transfer to the to be cooled Device achieved because the device for heat dissipation meabfuhr and the device to be cooled partially identical are, so that at this point no heat transfer must take place.

In Further development of the invention can be provided that the bottom plate and the sheet metal strip or the metal strips of a different material consist. This may be particularly due to the composite design easy to be realized. According to a preferred Embodiment, the bottom plate, the same time can serve as a housing wall, for example, comparatively stable aluminum or aluminum sheet to the device for heat dissipation and possibly the housing of an electronic Stabilize device. The metal bands with the On the other hand, slats can heat up very well conductive material to transport the heat well and to the ambient air. As material for the Sheet metal strips, for example, brass in question.

The invention further relates to a method for producing a device for heat dissipation consisting of a bottom plate and at least one bent sheet-metal strip with a multi-fin section and a mounting portion. The device is designed in particular as described above. A particularly simple process of manufacture can be achieved by openings are made in the bottom plate and formed on the attachment portion of the sheet metal pin, wherein then the Pins are fixed non-positively in the openings, for example by an undersize of the openings, riveting or the like. Optionally, in addition, a bonding of the pins in the openings take place, wherein the adhesive should then preferably have a high thermal conductivity.

According to one Particularly preferred method of preparation is provided that the Sheet metal strip from a flat sheet, such as an aluminum sheet, punched out and then bent. This is in the manufacturing process particularly simple and can be based on inexpensive standard materials To fall back on.

A high cooling efficiency can be at very favorable Manufacturing costs also achieve that several identical built-up metal strips nested in each other at the Base plate to be set.

Further Advantages, features and applications of the present Invention will become apparent from the following description of Embodiments and the drawing. All form described and / or illustrated features for itself or in any combination the subject matter of the present Invention, also independent of its summary in the claims or their remittances.

It demonstrate

1 a first embodiment of the device according to the invention in an exploded view;

2 a view of the inventive device according to 1 from above;

three a side view of the longitudinal side of the device according to 2 ;

4 a side view of the narrow side of the device according to 2 ;

5 Detail A according to 4 ;

6 a sheet metal strip for use in the first embodiment according to the 1 to 5 ;

7 a second embodiment of the device according to the invention in an exploded view and

8th the assembly state of the embodiment according to 7 ,

In the 1 illustrated device 1 consists of a base plate 2 and a meandering bent sheet metal strip three with a fin section 4 with several slats 5 and a fixing portion 6 , In the area of the attachment section 6 be the bottom plate 2 and the tin band three thermally conductive interconnected. For this purpose, in the attachment section 6 spigot 7 formed, the non-positively in openings 8th the bottom plate 2 be determined. These openings 8th are in the bottom plate 2 arranged at exactly the places where the pins 7 of the attachment section 6 of the meandering bent sheet metal strip three from the slats 5 towards the bottom plate 2 protrude. The openings 8th are as through the bottom plate 2 penetrating passages formed on the sheet metal strip three opposite side in a groove 9 the bottom plate 2 are arranged.

To the tin band three on the bottom plate 2 Safe to set and optimally align, the pins are 7 on the tin band three arranged in two parallel rows, which correspond in two grooves 9 the bottom plate 2 have, in which at a suitable distance the openings 8th are introduced. To assemble the bottom plate 2 and the sheet metal strip three become the cones 7 in the openings 8th the bottom plate 2 introduced and riveted there.

So the cones 7 not over the surface of the sheet metal strip three opposite side of the bottom plate 2 stand out, that is out of the opening 8th projecting part of the pin 7 in the groove 9 recorded, like 5 can be seen. There is the bottom plate 2 shown in the side view. On one side of the bottom plate 2 you can find it on the bottom plate 2 non-positively attached lamella 5 with the pin 7 passing through the unrecognizable opening 8th in the bottom plate 2 is stuck through and down into the groove 9 the bottom plate 2 extends.

2 shows the device 1 with the bottom plate 2 and the sheet metal strip specified thereon three in the supervision. As can be clearly seen, the individual slats 5 arranged in parallel, with two adjacent slats each 5 U-shaped over a lamella bridge 10 connected to each other. The side view according to three in which the bottom plate above and the sheet metal strip extending therefrom three shown below, shows that the lamella webs 10 relative to the height of the slats 5 take about one fifth of the space. Thus remain between the slats 5 each intermediate spaces 11 in which air at the lamellae 5 can flow past and thus optimally transported away at the large lamellae heat dissipated.

6 finally shows the still unbent, flat sheet metal strip three with the cones 7 at the attachment portion 6 , each one on one end face the slats 5 is trained. The individual slats 5 are above lamellar webs 10 interconnected with the sheet metal strip three each at the transition points between the slats 5 and the lamella webs 10 bent over 90 ° angled to the off 1 or 2 to produce an apparent meander shape of the sheet metal strip.

This bending can be done by machine in a second step, so that the sheet metal strip three by punching out a suitable flat sheet metal strip three , For example, an aluminum sheet strip, can be in the form of an endless belt.

The shape of the slats 5 at the attachment portion 6 opposite side corresponds to that for the device 1 available space for heat dissipation and is not limited to the forms shown.

In the 7 and 8th is an alternative device 12 shown for heat dissipation, which is the same floor plate 2 having.

However, the invention is not limited to the illustrated shape of the bottom plate 2 limited, which preferably simultaneously serves as the back wall of a lighting unit or display device. Since it consists of a flat sheet, it can be easily adapted to the housing contour, with mounting holes or other design-related openings can be performed.

As in particular the exploded view according to 7 it can be seen, there is the device 12 next to the bottom plate 2 from two metal bands 13 , which are each constructed identically, and offset from each other or nested on the bottom plate 2 be determined. The metal bands 13 have fins 14 each with a fastening portion 15 on which, similar to the previously described embodiment, pins 16 are formed by the attachment portion 15 protrude into the openings 8th the bottom plate 2 to be included.

In this way, both metal strips 13 non-positively with the bottom plate 2 connected. The slats 14 of the sheet metal strip 13 are in the area of the attachment section 15 on the opposite sides of the slats 14 each with a slat band 17 connected together so that the two, on different sides of the slats 14 arranged lamellar bands 17 the tin band 13 limit laterally. The slats 14 are on the lamella band 17 bent over and preferably placed perpendicular thereto.

Both metal bands 13 are now nested in such a way that the lamellar bands 17 of the first sheet metal strip 13 and the second sheet metal strip 13 lie on one another, wherein the slats of the second, in the illustration upper sheet metal strip 13 between the slats of the second, in the presentation lower sheet metal strip 13 are arranged when their cones 16 in the openings 8th be introduced.

8th shows the fully assembled device 12 , in which the lamellar bands 17 but not shown. This is because the lamellar bands 17 in a further step of the manufacturing process of the slats 14 after fixing on the bottom plate 2 were separated. This is possible because the cones 16 every slat 14 directly in the openings 8th the bottom plate 2 are fixed and thus each slat 14 to back up.

However, according to the invention it is also possible, the lamellar bands 17 for additional stabilization of the slats 14 lying on the floor plate 2 to leave

1

contraption for heat dissipation

2

baseplate

3

metal strip

4

fin section

5

lamella

6

attachment section

7

spigot

8th

opening

9

groove

10

sipe web

11

gap

12

contraption for heat dissipation

13

metal strip

14

slats

15

mounting interface

16

spigot

17

segment belt

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19806978 B4 [0005]
• - DE 20309856 U1 [0006]
• - DE 60035255 T2 [0007]

Claims (11)

Device for heat removal consisting of a base plate ( 2 ) and at least one bent sheet metal strip ( three . 13 ) with a fin section ( 4 ) with several fins ( 5 . 14 ) and a fastening section ( 6 . 15 ), the bottom plate ( 2 ) and the sheet metal strip ( three . 13 ) are connected to one another in a heat-conducting manner, characterized in that in the fastening section ( 4 ) Pins ( 7 . 16 ) are formed, the non-positively in openings ( 8th ) of the bottom plate ( 2 ). Device according to claim 1, characterized in that the pins ( 7 . 16 ) in the openings ( 8th ) of the bottom plate ( 2 ) are riveted. Device according to claim 1, characterized in that the pins ( 7 . 16 ) into the openings ( 8th ) of the bottom plate ( 2 ) are inserted force fit. Device according to one of the preceding claims, characterized in that the pins ( 7 . 16 ) in the openings ( 8th ) of the bottom plate ( 2 ) are glued. Device according to one of the preceding claims, characterized in that the sheet metal strip ( three ) is bent meandering. Device according to one of claims 1 to 4, characterized in that the lamellae ( 14 ) of the sheet metal strip ( 13 ) in the region of the attachment section ( 15 ) on the opposite sides of the slats ( 14 ) each via a slat band ( 17 ) are interconnected. Apparatus according to claim 6, characterized in that a plurality of sheet metal strips ( 13 ) are arranged nested. Device according to one of the preceding claims, characterized in that the bottom plate ( 2 ) of the device ( 1 . 12 ) forms a housing surface of an electronic device for heat dissipation. Method for producing a device ( 1 . 12 ) for heat dissipation consisting of a bottom plate ( 2 ) and at least one bent sheet metal strip ( three . 13 ) with a fin section ( 4 ) with several fins ( 5 . 14 ) and a fastening section ( 6 . 15 ), characterized in that in the bottom plate ( 2 ) Openings ( 8th ) and at a mounting portion ( 6 . 15 ) of the sheet metal strip ( three . 13 ) Pins ( 7 . 16 ), in which case the pins ( 7 . 16 ) in the openings ( 8th ) are fixed non-positively. Method according to claim 9, characterized in that the sheet metal strip ( three . 13 ) punched out of a flat sheet and then bent. A method according to claim 9 or 10, characterized in that a plurality of identically constructed metal strips ( 13 ) interconnected to each other at the bottom plate ( 2 ) be determined.