DE102014006751A1 - Composite assembly and method of manufacturing the composite assembly - Google Patents

Abstract

The invention has for its object to provide a cost-effective, weight and space-optimized composite arrangement for cooling of electrical and / or electronic consumers. It is proposed a composite arrangement 1, with at least one electrical and / or electronic consumer 2, with at least one heat-emitting body for cooling the at least one consumer 2, so that the heat produced by the consumer 2 Q is at least partially released to an environment of the composite assembly 1 or can be dispensed, with a carrier 3, wherein the carrier 3 has a bearing surface in a planar extension, on which the at least one heat-emitting body rests flat as a heat-conducting film 4.

Description

The invention relates to a composite arrangement with at least one electrical and / or electronic consumer, with at least one heat-emitting body for cooling the at least one consumer, so that a heat produced by the consumer is at least partially delivered to an environment of the composite arrangement or can be dispensed and with a carrier , The invention also relates to a method for manufacturing the composite assembly.

Composites, in particular material composites, allow the combination of different materials and thus different property profiles. The material composites may be, for example, metal-metal composites, ceramic-metal composites or metal-plastic composites. Composite materials are used, for example, as heat sinks for integrated heat-emitting electrical and electronic components.

Such is for example from the publication DE 20 2005 003 502 U1 , which is probably the closest prior art, a fin-type heat sink made of an aluminum-copper composite material with an integrated heat pipe for cooling of heat-emitting electrical and electronic components known. The fin heat sink comprises one or more heat pipes and adapter systems for receiving the heat-absorbing ends of the heat pipes. The fins have holes for the heat pipes, wherein the fins are attached to the heat-emitting ends of the heat pipes.

The invention has for its object to provide a cost-effective, weight and space-optimized composite arrangement for cooling of electrical and / or electronic consumers. This object is achieved by a composite arrangement with the features of claim 1 and by a method for manufacturing the composite arrangement with the features of claim 13. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and / or the accompanying figures.

According to the invention, a composite arrangement is thus proposed. Preferably, the composite assembly is formed as a composite material. The composite material is made in particular of components made of different materials with different property profiles, which are combined to form a component with a new property profile using a material-compatible joining technology. The individual components can, for example, be adhesively bonded to one another, in particular glued or welded together, alternatively or optionally complementarily positively and / or non-positively connected to each other.

The composite arrangement comprises at least one electrical and / or electronic consumer. In particular, the consumer is characterized by an unwanted heat during operation. Particularly preferably, the consumer is designed as a lighting means. Alternatively or optionally in addition, the consumer is designed as an entertainment device or at least as a component thereof, such as a processor or power electronics.

The composite arrangement has at least one heat-dissipating body for cooling the consumer so that heat produced by the consumer is at least partially released or can be delivered to an environment of the composite arrangement. By cooling the consumer overheating can be avoided and consequently the life expectancy of the consumer can be ensured. To ensure sufficient cooling of the consumer, it is preferred that the heat-emitting body has a thermal conductivity of at least 100, in particular of at least 120, in particular of at least 150 W / (m × K).

The composite arrangement has a carrier, which is designed in particular rigid. The carrier may be made of a metal, a metal alloy, a plastic and / or a fiber-reinforced plastic, for example. It is possible that the carrier is formed in a planar extension straight and / or curved. For example, the support has a total area of at least 10 square centimeters, in particular of at least 50 square centimeters, in its planar extent. Further, the carrier may be formed in a large format and have an area of at least one square meter, in particular of at least five square meters. Furthermore, the carrier, for example, a thickness of at most 15 centimeters, in particular of at most 10 centimeters, in particular of a maximum of 5 centimeters.

In the context of the invention it is proposed that the carrier has in its planar extension a bearing surface on which the at least one heat-emitting body rests flat as a heat-conducting film. The support surface is in particular one of two main surfaces of the support. For example, the heat-conducting film is glued, welded and / or molded on the support surface. For example, the heat-conductive foil has a maximum thickness of 2 millimeters, in particular of a maximum of 1 millimeter, in particular of a maximum of 0.5 millimeters.

An advantage of the heat-conducting film is that it is particularly thin and thus weight-optimized and space-saving compared to solid components such as cooling ribs executable. Likewise, can be dispensed with additional cooling components, such as fans and thus space, weight, electrical energy and thus costs can be saved. Furthermore, the film is easy to manufacture and handle, which achieves low production times for the production of the film and the composite assembly.

By applying the heat-conducting film along the surface extension of the carrier, the available support surface can be fully or at least extensively exploited. In this way, the thermally conductive film has excellent heat radiation properties to the environment of the composite structure. Furthermore, the application of the heat-conducting film to the carrier obviates weakening of the carrier, which would be necessary, for example, in integrating a heat-dissipating body in the carrier.

For example, the thermally conductive foil is made of a metal such as aluminum or copper or of a metal alloy such as an aluminum alloy or copper alloy. However, it is particularly preferable that the thermally conductive film is formed as a graphite film. In particular, the graphite foil is made of or comprises a graphite. For example, the graphite foil is a matrix with embedded graphite filler. Particularly preferably, the graphite foil is a plastic with embedded graphite particles. The graphite foil is integrated, for example, in a fiber composite, wherein the fiber composite may be formed at least by a portion of the carrier. Key benefits of graphite include low specific gravity, high conductivity, thermal stability and low thermal expansion coefficient. Specifically, the graphite in comparison to good heat conducting metals such as aluminum or copper has a lower specific weight and at the same time a sufficient thermal conductivity.

From the structural design is preferred that the at least one consumer is arranged on the heat-conducting film for heat dissipation. In particular, the composite arrangement forms a stacked construction with the carrier, the thermally conductive foil arranged thereon and the consumer arranged thereon. Advantageously, the direct attachment of the consumer on the heat-conducting film at least partially achieves an immediate heat dissipation of the heat produced to the heat-conducting film.

In a preferred development, a main surface of the heat-conducting film facing the consumer is larger than a maximum main surface of the consumer. In particular, the main surface facing the consumer forms at least a region of one of the two main surfaces of the carrier. Particularly preferably, the main surface facing the consumer forms the support surface for the consumer. For example, the facing major surface of the heat-conducting film is at least 10%, in particular at least 20%, in particular at least 30% larger than the maximum main surface of the consumer. This embodiment has the advantage that the main surface aligned with the environment is not covered by the consumer and thus exposed, so that unimpeded heat emission is converted to the environment of the composite arrangement.

Alternatively or optionally in addition, it can be provided that the at least one consumer is arranged on the side of the carrier which is opposite the support surface. It is preferred that the at least one consumer is thermally coupled to the heat-conducting film. This embodiment is advantageous if heat is to be dissipated on the side of the carrier opposite the consumer.

For the thermal coupling, in particular the composite arrangement has a heat transfer body integrated in the support. For heat conduction of the heat produced by the consumer to thermally conductive film disposed on the other side, it is preferred that the at least one consumer contacts the heat transfer body and the heat transfer body contacts the heat-conducting film for heat release. In this way, the heat can be conducted locally to the other side of the carrier and released to the environment. For example, the carrier has a passage opening in which the heat transfer body is introduced.

Optionally, in addition, it is possible that in each case the heat-conducting film is arranged on both main surfaces of the carrier, in particular flat rests. Thus, if necessary, the heat can be distributed and radiated on both sides of the carrier. In this way a uniform heat distribution and delivery is achieved in the composite arrangement.

In a particularly preferred embodiment of the heat transfer body is formed of a graphite foam. The graphite foam is characterized by its high thermal conductivity, its lightweight construction and compared to metals such as aluminum and copper by its cost-efficiency. In particular, the graphite foam is designed to be bonded cohesively in the cured state with the carrier. In this way, additional holding means, such as an adhesive and additional manufacturing steps, such as welding together, can be dispensed with.

In a preferred embodiment of the invention, the at least one consumer is designed as an LED, as an LED board and / or as an LED strip. In particular, the composite arrangement with the at least one LED is designed as a lighting device, in particular as a surface light for direct or indirect illumination. Particularly preferably, the composite arrangement is formed with the at least one LED as an I-panel light. Alternatively or optionally in addition, the at least one consumer is designed as the entertainment device or as a component thereof. The entertainment device may be, for example, a television, a music system, a tablet PC, a touchscreen and / or a game console.

A preferred implementation of the invention provides that the carrier is formed as a sandwich composite with a core portion and at least one, but preferably two-sided outer layers. Preferably, the at least one cover layer is a load-bearing cover skin and the core section is a support core. Preferably, the support core is formed as a honeycomb core, further exemplary alternatives are a core with rib or web structure or a foam core. This embodiment as a sandwich composite achieves an optimum stiffness-weight ratio of the carrier and consequently of the composite arrangement. The at least one cover layer and the core section may be made of the same material, but also different combinations of materials are possible. For example, the at least one cover layer and / or the core section is made of a fiber-reinforced plastic. The at least one cover layer and the core section can be positively, positively and / or materially bonded, particularly preferably glued together.

In one possible development, the at least one cover layer or at least one of the two cover layers is designed as the heat-conducting film. Alternatively, it is possible for the thermally conductive foil to be arranged on the at least one cover layer. In a further possible alternative, the sandwich composite, in particular the support core and / or the cover layer comprises a recess in which the heat-conducting film is arranged.

The arrangement, in particular fixing the heat-conducting film on the support surface is preferably carried out during manufacture, in particular during compression of the sandwich layers of the sandwich composite. In particular, no subsequent attachment of the heat-conducting film takes place on the finished, already pressed sandwich composite. By reducing the individual production steps, working time and associated costs can be saved. Alternatively, however, it is also possible that the arrangement, in particular fixation of the heat-conducting film prior to production or after the production of the sandwich composite possible.

In a preferred development, the heat transfer body is integrated in the core section, in particular in the honeycomb core. With regard to production, it is preferably provided that the heat transfer body, in particular the graphite foam, is introduced, for example injected, into a passage opening provided in the core section. Preferably, in a subsequent manufacturing step, the at least one cover layer for producing the sandwich composite is applied to the core section.

In an alternative embodiment to the sandwich composite, the carrier is formed as a monolithic plate. The monolithic plate is in particular exactly one component element and thus not a composite material. Preferably, the monolithic plate is made of exactly one material such as a plastic or aluminum, alternatively made of a composite material such as a fiber composite material. For example, the monolithic plate is formed as an aluminum sheet or as a plastic fiber reinforced plate.

In a particularly preferred embodiment of the invention, the composite arrangement is designed as an aircraft panel. The composite arrangement as the aircraft panel is designed in particular for an interior of an aircraft, in particular for an aircraft cabin. For example, the composite arrangement as the aircraft panel is at least partially and / or in sections a panel component of the aircraft. The cladding component may be a ceiling, floor and / or wall panel. Alternatively or optionally in addition, the composite arrangement as the aircraft panel may include or form part of an interior of the aircraft, such as an interior light or entertainment device.

Another object of the invention relates to a method for manufacturing the composite assembly according to the preceding description. In one step, the thermally conductive film is applied to the carrier, in particular to the monolithic plate or the sandwich composite, in particular to the core portion and / or on the cover layer of the sandwich composite. It is preferred that the thermally conductive film and the carrier are in particular formed together, for example in a desired curved shape of the composite arrangement as the aircraft panel. In a further, parallel, previous or subsequent step, the at least one consumer is applied to the heat-conductive foil and / or to the side of the carrier opposite the contact surface.

Further features, advantages and effects of the invention will become apparent from the following description of preferred embodiments of the invention. Showing:

1 in cross section a composite assembly as a first embodiment of the invention;

2 in cross section, the composite assembly as a second embodiment of the invention;

3 in cross section, the composite assembly as a third embodiment of the invention;

4 an aircraft cabin with the composite assembly according to the embodiments of the 1 . 2 or 3 designed as an aircraft panel.

Corresponding or identical parts are each provided with the same reference numerals in the figures.

1 shows a composite arrangement in a two-dimensional representation 1 as a first embodiment of the invention. The composite arrangement 1 includes at least one electrical and / or electronic consumer 2 which develops heat during operation. The consumer is, for example, an LED, an LED board, an LED strip and / or an entertainment device such as a TV or a tablet PC. The composite arrangement 1 can be designed as an aircraft panel with an integrated interior light or with an integrated entertainment device. For example, the aircraft panel is an equipment component of the aircraft. Alternatively, the aircraft panel is at least partially and / or in sections a panel component of the aircraft such as a wall or ceiling panel.

The composite arrangement 1 includes a carrier 3 , the shoring of the composite arrangement 1 forms. The carrier 3 has in the planar extension L a cross-sectional area of at least 10 square centimeters and a thickness d of at most 10 centimeters. In this embodiment, the carrier 3 as a sandwich composite with a core section 3a and a cover layer 3b located on one of two major surfaces of the core section 3a is arranged, formed. It is also possible that the sandwich composite on the main surfaces of the core section 3a each one arranged cover layer 3b having. The core section 3a is formed for example as a honeycomb core.

The composite arrangement 1 has to cool the at least one consumer 2 a heat-releasing body serving as a thermally conductive foil 4 is trained. This embodiment has the advantage that the weight and dimensions of the composite assembly 1 for a cooling device for cooling the load 2 are minimal. For example, the heat-conducting film 4 a maximum thickness of 0.5 millimeters. The thermally conductive foil 4 is on a support surface of the carrier 3 arranged flat, so that the largest possible cross-sectional area is implemented for heat dissipation. The bearing surface forms in a planar extension of the carrier 3 at least a portion of one of the two major surfaces of the carrier 3 , In this embodiment, the core portion 3a a recess in which the heat-conducting film 4 is introduced and for example with the top of the core section 3a flush. It is also possible, instead of the recess, the heat-conducting film 4 directly on the top of the carrier 3 , here on the top of the core section 3a applied.

For example, the thermally conductive foil 4 formed as a graphite foil. The graphite foil is formed for example from a plastic with embedded graphite. An advantage of the graphite foil is compared to non-metallic materials such as plastic, the good thermal conductivity and the relative to metals low specific gravity, so that optimum cooling performance is achieved with minimal weight.

In this embodiment, the consumer 2 directly on the thermally conductive foil 4 arranged. In this way, that is the consumer 2 produced heat Q at least partially directly to the heat-conducting film 4 issued. The to the thermally conductive foil 4 emitted heat Q is in turn to a surrounding area of the composite assembly 1 issued. The direct heat conduction prevents heat accumulation in the consumer 2 so that overheating and consequent reduction in the life of the consumer 2 prevented or at least reduced. The consumer 2 facing main surface of the heat-conducting film 4 is greater than a maximum major area of the at least one consumer 2 , so that an optimal heat flow of the heat Q is implemented. Furthermore, an immediate heat release to the environment of the composite assembly 1 respectively.

2 shows in the two-dimensional representation of a second embodiment of the composite assembly 1 , The composite arrangement 1 includes the carrier 3 with the core section 3a as well as two outer layers 3b , wherein the cover layers 3b on each one of the two major surfaces of the core section 3a are arranged. Furthermore, the composite arrangement comprises 1 the thermally conductive foil 4 , which is formed for example as graphite foil. The core section 3a and one of the two cover layers 3b of the carrier 3 have a recess in which the heat-conducting film 4 is arranged.

The consumer 2 is on the opposite side of the support surface from the support surface 3 arranged. For cooling the consumer 2 includes the composite arrangement 1 a heat transfer body 5 , about this the consumer 2 with the thermally conductive foil 4 thermally coupled. The carrier 3 comprises transversely to the longitudinal extent of a passage opening in which the heat transfer body 5 is integrated. The consumer 2 is on the heat conduction body 5 arranged and connected to this example, cohesively. By the direct coupling is that of the consumer 2 developed heat Q directly to the heat transfer body 5 issued. The heat transfer body 5 contacts the thermally conductive foil 4 so that the to the heat transfer body 5 delivered heat Q in turn to the heat-conducting film 4 is delivered. Because the thermally conductive foil 4 at least in sections, an upper side of the composite arrangement 1 forms and thus exposed, the heat Q can be released unhindered to the environment. Consequently, the heat Q of the consumer 2 at least partially over the heat transfer body 5 to the heat-conducting film 4 routed and on the opposite side of the carrier 3 delivered to the environment.

For example, the heat transfer body 5 formed as a graphite foam, with the carrier 3 is connected cohesively. Alternatively, it is possible that the heat transfer body 5 is formed as a graphite plate or as a non-metallic or metallic body with embedded graphite particles.

3 shows in the two-dimensional representation of the composite arrangement 1 as a third embodiment of the invention. As in the embodiments shown the 1 and 2 includes the composite arrangement 1 here too the carrier 3 , where the carrier 3 is formed as a monolithic plate. The monolithic plate is a solid component made of a solid material. For example, the monolithic plate is a metal or plastic plate. The composite arrangement 1 includes on both major surfaces each of the heat-conducting film 4 with the consumer applied thereto 2 , However, it would alternatively also be possible to have the heat-conducting film only on one of the two main surfaces 4 and / or the consumer 2 to arrange.

The thermally conductive foils 4 are directly on the tops of the carrier 3 applied. Alternatively, it is possible in the carrier 3 the recess for the introduction of the heat-conducting film 4 and possibly for the flush termination between the top of the carrier 3 and the thermally conductive foil 4 provided. The carrier 3 can be made of a poor thermal conductivity material such as a plastic, so that the heat Q mainly on the thermally conductive foil 4 is transmitted. Alternatively, the carrier comprises 3 the heat transfer body 5 , who for the heat conduction, the two thermally conductive films 4 contacted. Another alternative is the carrier 3 as the heat transfer body 5 educated. For example, the carrier is 3 as the heat transfer body 5 made of a highly thermally conductive material such as aluminum or graphite foam, so that the heat conduction between the two heat-conducting films 4 is generated.

The consumers shown 2 For example, are designed as LEDs, so that the composite assembly 1 is designed as a surface light with two-sided light emission.

In the in the 1 to 3 shown embodiments of the composite assembly 1 is a straight, in particular flat surface extension of the carrier 3 shown.

However, there is also a curved and / or curved shape of the carrier 3 possible in the flat extension. The arched and / or curved shape of the vehicle 3 is suitable for example in the formation of the composite arrangement 1 as the trim component of the aircraft, in particular as the ceiling or wall panel for adaptation to the inner cabin shape of the aircraft.

4 shows exemplary embodiments of the composite assembly 1 in the interior 6 of the plane. As a first example, the composite arrangement 1 as an I-panel light 1a educated. By way of example, the I-panel light shows 1a on both main surfaces of the carrier 3 at least one LED as a consumer 2 so that it radiates in two directions.

As a second example, the composite arrangement 1 as a ceiling panel 1b formed with an integrated surface light. Thus, it is in the composite arrangement 1 around an interior trim component of the aircraft cabin with integrated lighting. The ceiling panel 1b has at least one light source, for example LED as a consumer 2 on. Due to the curved shape of the ceiling panel 1b can be provided that the consumer 2 for a flat support on the support 3 For example, is designed as a flexible LED foil.

As a third example, the composite arrangement 1 as a wall panel 1c with an integrated entertainment device as the consumer 2 educated. Thus, it is in the composite arrangement 1 around an interior trim component of the aircraft cabin with the integrated entertainment device. The entertainment device may be for example a touch screen, a sound system, a telephone system, a multimedia system or a television.

LIST OF REFERENCE NUMBERS

1

composite assembly

1a

I-Panel Light

1b

Ceiling panel with integrated surface light

1c

Wall panel with integrated entertainment device

2

consumer

3

carrier

3a

core section

3b

topcoat

4

Thermally conductive foil

5

Heat transmission body

6

Interior of the plane

L

Areal extent

d

Thickness of the carrier 3

Q

warmth

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202005003502 U1 [0003]

Claims (14)

Composite arrangement ( 1 ) with at least one electrical and / or electronic consumer ( 2 ), with at least one heat-emitting body for cooling the at least one consumer ( 2 ), so that one of the consumer ( 2 ) produced heat (Q) at least partially to an environment of the composite arrangement ( 1 ) or is deliverable, with a carrier ( 3 ), characterized in that the carrier ( 3 ) has a bearing surface in a planar extension, on which the at least one heat-emitting body as heat-conducting film ( 4 ) rests flat. Composite arrangement ( 1 ) according to claim 1, characterized in that the thermally conductive foil ( 4 ) is formed as a graphite foil. Composite arrangement ( 1 ) according to one of the preceding claims, characterized in that the at least one consumer ( 2 ) for heat release on the thermally conductive film ( 4 ) is arranged. Composite arrangement ( 1 ) according to claim 3, characterized in that one to the consumer ( 2 ) facing the main surface of the thermally conductive film ( 4 ) is greater than a maximum main area of the at least one consumer ( 2 ). Composite arrangement ( 1 ) according to claim 1 or 2, characterized in that the at least one consumer ( 2 ) on the opposite side of the carrier ( 3 ) is arranged. Composite arrangement ( 1 ) according to claim 5, characterized in that the composite arrangement ( 1 ) a heat transfer body integrated in the support ( 5 ), wherein for the heat transfer from the consumer ( 2 ) to the thermally conductive film ( 4 ) the at least one consumer ( 2 ) the heat transfer body ( 5 ) and the heat transfer body ( 5 ) the thermally conductive foil ( 4 ) contacted for heat dissipation. Composite arrangement ( 1 ) according to claim 6, characterized in that the heat transfer body ( 5 ) is formed from a graphite foam. Composite arrangement ( 1 ) according to one of the preceding claims, characterized in that the at least one consumer ( 2 ) is formed as an LED, as an LED board and / or as an LED strip. Composite arrangement ( 1 ) according to one of the preceding claims, characterized in that the carrier ( 3 ) as a sandwich composite with a core section ( 3a ) and at least one cover layer ( 3b ) is trained. Composite arrangement ( 1 ) according to claim 9, characterized in that the heat transfer body ( 5 ) in the core section ( 3a ) is integrated. Composite arrangement ( 1 ) according to one of the preceding claims 1 to 9, characterized in that the carrier ( 3 ) is formed as a monolithic plate. Composite arrangement ( 1 ) according to one of the preceding claims, characterized in that the composite arrangement ( 1 ) as an aircraft panel ( 1b . 1c ) is trained. Method for manufacturing the composite assembly ( 1 ) according to one of the preceding claims, characterized by the following steps: - application of the heat-conducting film ( 4 ) on the carrier ( 3 ) - applying the at least one consumer ( 2 ) on the thermally conductive foil ( 4 ) and / or on the opposite side of the support surface ( 3 ). Process according to claim 13, characterized by the intermediate step: - forming the thermally conductive foil ( 4 ) and the carrier ( 3 ).

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