Abstract
A heat discharge device having a bottom plate having a bottom and an upper surface. Heat discharge blades extend between two front faces of the bottom plate and inclinations of the heat discharge blades are configured in a way such that neighbouring heat discharge blades alternatingly approach one another and move away from each other. Neighbouring heat discharge blades are connected to one another at the end regions facing away from the upper surface of the bottom plate directly and delimit a first air flow channel. Neighbouring heat discharge blades delimit a second air flow channel, which is open at the side facing away from the upper surface of the bottom plate. The heat discharge blades have a group of air vents, wherein the first air flow channels are open at the opposite distal ends thereof and the second air flow channels are closed at the opposite distal ends thereof.
Claims
1.-19. (canceled)
20. A heat discharge device configured for arrangement on an electronic component, comprising a heat conductive bottom plate having a bottom and an upper surface facing away from the bottom, wherein heat discharge blades extend between two opposite front faces of the bottom plate from the upper surface of the bottom plate transversely across the bottom plate and inclined in respect to the upper surface of the bottom plate, wherein the inclinations of the heat discharge blades in respect to the upper surface of the bottom plate are configured in a way such that neighbouring heat discharge blades alternatingly approach one another and move away from each other, wherein the neighbouring heat discharge blades approaching one another are connected to one another at the end regions thereof facing away from the upper surface of the bottom plate directly, or by a cover wall, and delimit a first air flow channel, wherein the neighbouring heat discharge blades moving away from one another delimit a second air flow channel, which is open at the side thereof facing away from the upper surface of the bottom plate, wherein the heat discharge blades have a plurality of air holes and/or air vents, and wherein the first air flow channels are configured to be open at the opposite distal ends thereof and the second air flow channels are configured to be closed at the opposite distal ends thereof.
21. A heat discharge device according to claim 20, wherein the first air flow channels have a trapezoid cross-sectional shape.
22. A heat discharge device according to claim 20, wherein the distal ends of the second air flow channels are configured to be closed by crimping the ends.
23. A heat discharge device according to claim 20, wherein a sum of the cross-section areas of all first air flow channels is smaller than a sum of the areas of the air holes or air vents, respectively, in the heat discharge blades delimiting the first air flow channels.
24. A heat discharge device according to claim 20, wherein the upper surface of the bottom plate has ribs, on which there are arranged the discharge blades.
25. A heat discharge device according to claim 20, wherein the upper surface of the bottom plate has slits, into which the heat discharge blades are inserted.
26. A heat discharge device according to claim 24, wherein heat discharge blades are connected to the ribs or slits by a heat conductive adhesive bond.
27. A heat discharge device according to claim 20, wherein the heat discharge blades are composed of copper or aluminium.
28. A heat discharge device according to claim 20, wherein the bottom plate is composed of copper, a copper-aluminium-composite or an alloy.
29. A heat discharge device according to claim 28, wherein surfaces of the bottom plate have at least in those portions, which are provided for abutment to an electronic component, an electrically insulating layer, in particular an anodized layer.
30. A heat discharge device according to claim 20, wherein the bottom of the bottom plate is configured to be arranged at the at least one electronic component by being provided with relief-like recesses, the shape and dimension of which correspond to a contour of the electronic component.
31. A heat discharge device according to claim 20, wherein the air holes of the heat discharge blades are configured as round holes and/or elongate holes.
32. A heat discharge device according to claim 20, wherein the air vents of the heat discharge blades are configured in parallel to one another and orthogonal to the upper surface of the bottom plate upright within the heat discharge blades.
33. A heat discharge device according to claim 20, wherein the heat discharge blades are configured as extruded sections.
34. A heat discharge device according to claim 20, wherein the heat discharge device has at least one electric ventilator arranged above the heat discharge blades.
35. A heat discharge device according to claim 34, wherein the ventilator, in operation, blows an air flow into the open second air flow channels.
36. A heat discharge device according to claim 34, wherein the at least one ventilator is mounted at the front faces of the bottom plate or at side walls extending upwards at or near the front faces of the bottom plate.
37. A heat discharge device according to claim 36, wherein the at least one ventilator is mounted at the front faces of the bottom plate or at side walls extending upwards at or near the front faces of the bottom plate by a mounting element connected to all heat discharge blades at the distal ends of the second air flow channels.
38. A heat discharge device according to claim 20, wherein the heat discharge blades are configured as trapezoid coil springs.
Description
[0025] The invention is now explained in greater detail in reference to the drawings by way of non-limiting embodiment examples.
[0026] FIG. 1 shows a perspective of a heat discharge device according to the present invention in a preferred embodiment;
[0027] FIG. 2 shows a perspective front view of the heat discharge device with an air flow course;
[0028] FIG. 3 shows heat discharge blades according to the present invention having open or closed, respectively, air flow channels at opposite distal ends;
[0029] FIG. 4 shows a front view of the heat discharge blades;
[0030] FIG. 5 shows a perspective front view of heat discharge blades having air vents;
[0031] FIG. 6 shows a perspective front view of the heat discharge blades arranged in slits of a bottom plate;
[0032] FIG. 7 shows a bottom perspective of the heat discharge device.
[0033] In the following there is made reference to the drawings and initially to the FIGS. 1 and 3. Hence, the present invention comprises a heat discharge device 100 for the arrangement on at least one electronic component 11. The heat discharge device 100 comprises further a heat conductive bottom plate 20 having a bottom 21 and an upper surface 22 facing away from the bottom 21, wherein heat discharge blades 30 extend between two opposing front faces of the bottom plate 20 from the upper surface 22 of the bottom plate 20 transversely across the bottom plate 20 and inclined in respect to the upper surface of the bottom plate 20. The bottom plate thus is composed of metal, in particular aluminium, or an alloy, wherein the surfaces of the bottom plate have at least in those portions, which are provided for abutment to the at least one electronic component, an electrically insulating layer, in particular an anodized layer. The inclinations of the heat discharge blades 30 in respect of the upper surface 22 of the bottom plate 20 are configured such that neighbouring heat discharge blades 30 alternatingly approach one another or move away from one another. The neighbouring heat discharge blades approaching one another are connected to one another at their end regions facing away from the upper surface 22 of the bottom plate 20 directly or by means of a cover wall 32 and delimit a first air flow channel 33. The neighbouring heat discharge blades 30 moving away from one another delimit a second air flow channel 34, which is open at the side thereof facing away from the upper surface 22 of the bottom plate 20. The first air flow channels 33 hereby have an essentially trapezoid cross-sectional shape. The heat discharge blades 30 have a plurality of air holes 31 and/or air vents 31′, wherein the sum of the cross-sectional areas of all first air flow channels is smaller than the sum of the areas of the air holes 31 or the air vents 31′, respectively, within the heat discharge blades 30 delimiting the first air flow channels 33. The first air flow channels 33 are hereby configured to be open at their opposite distal ends 33′ thereof and the second air flow channels 34 at their opposite distal ends 34′ closed by crimping the ends. In order to configure the ends 34′ mentioned to be closed, there may be used any methods known form prior art, thus not being limited to the crimping of these ends 34′. The heat discharge blades 30 mentioned above are configured as extruded section, wherein these may be produced by way of various extrusion methods such as, for example, by means of direct, indirect or hydrostatic extrusion methods. Furthermore, the heat discharge blades 30 and the bottom plate 20 may also be produced as an integral piece by extrusion. A further production method for producing the heat discharge blades 30 could be 3D printing, wherein there may be used as a material, for example, metal filaments comprising a mixture of metal powders (e.g., aluminium or copper) and plastic materials (e.g., PLA or ABS). In another further production method, the heat discharge blades 30 could also be produced from a metal sheet, which is arcuate and bonded to the bottom plate 20. The air holes 31 and/or air vents 31′ hereby could be produced by way of etching, punching or cutting, for example. Latter could be, for example, laser cutting or water jet cutting. According to an alternative embodiment variant of the heat discharge device 100 according to the invention, the heat discharge blades 30 are configured as trapezoid coil springs.
[0034] As visible in FIG. 1, the upper surface 22 of the bottom plate 20 has ribs 24, on which the heat discharge blades 30 made from copper or aluminium are disposed. Alternatively, as depicted in FIG. 2, the upper surface 22 of the bottom plate 20 may have slits 25, into which the heat discharge blades 30 are inserted. In both embodiments, the heat discharge blades 30 are connected to the ribs 24 or slits 25 by means of a material bond, in particular a heat conducting adhesive bond.
[0035] FIG. 1 further shows the second air flow channels 34 having closed, i.e. crimped, distal ends 34′ opposite to one another, wherein FIG. 2 illustrates a sectional view through the heat discharge device or a sectional view through the second air flow channels 34, respectively.
[0036] FIGS. 3 and 4 show the heat discharge blades 30 with the first air flow channels 33 and the second air flow channels 34 in detail. In this regard, according to the present invention, the opposite distal ends 33′ of the first air flow channels 33 are open and the opposite distal ends 34′ of the second air flow channels 34 are closed, in particular crimped. The air holes 31 of the heat discharge blades 30 are thereby configured as round holes and/or elongate holes. Apart from round holes and elongate holes, the heat discharge blades may have any other geometrical shape.
[0037] In FIG. 5, the heat discharge blades 30 are depicted having air vents 31′, which may be configured in parallel to one another and orthogonal to the upper surface 22 of the bottom plate 20 upright within the heat discharge blades 30 and may be produced by way of chipping production methods, preferably by sawing. The heat discharge blades 30 may also have a combination of air holes 31 and air vents 31′.
[0038] FIG. 6 shows a sectional view through the heat discharge device 100 and the arrangement of the heat discharge blades 30 in slits 25 of the upper surface 22 of the bottom plate 20. As described above, the heat discharge blades 30 are connected to the bottom plate 20 by means of a material bond, in particular a heat conductive adhesive bond. For reasons of clarity, the second air flow channels 34 depicted in FIG. 6 are open at one distal end 34′ and closed by means of crimping at the end opposite to the distal end 34′.
[0039] FIG. 7 shows the bottom 21 of the bottom plate 20, which is arranged on the at least one electronic component 11, by being provided with relief-like recesses 23, the shape and dimension of which essentially corresponding to the contour of the electronic component 11 or the contour of the printed circuit board or the electronic assembly, respectively. The electronic component 11 is herein disposed on a printed circuit board 10. The bottom plate 20 forms a contact with the electronic component 11 in such a way that there is formed between the surface of the electronic component 11 and the relief-like recesses 23 of the bottom 21 of the bottom plate 20 essentially only a narrow gap. This narrow gap is then filled with a material, which is a good heat conductor, such as a heat conductive paste, gel, phase change material, foam or grouting mass, free from air. The relief-like recesses 23 further enable to form a contact, essentially free from an air gap, as described above, between the circuit board 10 through the bottom 21 of the bottom plate 20. The recesses may be produced by methods known from prior art such as milling or embossing.
[0040] In the following there is again made reference to FIGS. 1 and 2. As visible in FIG. 1, the heat discharge device 100 has at least one electronic ventilator 40 arranged above the heat discharge blades 30. This ventilator in operation blows an air flow, as visible in FIG. 2, into the open second 32 air flow channels. The air inflow 71 and the air outflow 71′ are realized preferably via different axes. For example, the air inflow 71 may be carried out via a vertical axis, and the air outflow 71′ may be realized via a horizontal axis extending transversely to the vertical axis or vice versa if the ventilator 40 is operated in suction operation instead of a blowing operation. The highest heat transfer thereby is realized preferably within the plurality of air holes 31 and/or air vents 31′ of the heat discharge blades 30, wherein the air flow 70 passes the air holes 31 and/or the air vents 31′ preferably only once.
[0041] The at least one ventilator 40 is mounted at the front faces of the bottom plate 20 or at the side walls 60′ extending upwards at the or near the front faces of the bottom plate 20. Alternatively, the at least one ventilator is mounted by means of a mounting element 60 connected to all heat discharge blades 30 at the distal ends 34′ of the second air flow channels 34 to the front faces of the bottom plate 20 or the side walls 60′ extending upwards at the or near the front faces of the bottom plate 20. The material of the mounting element 60 is preferably plastic material, wherein the mounting element 60 may also be composed of any other material such as, for example, metal. The at least one ventilator 40 is connected to the mounting element 60 by means of attachment elements such as, e.g., screws 80, wherein the ventilator 40 may also be bonded to the mounting element 60.
[0042] In electronic components with particularly high heat discharge and/or when cooling a plurality of electronic components, there is provided to arrange a second 40′ electric ventilator above the heat discharge blades 30, in parallel to the first 40 ventilator. This second ventilator has essentially the same technical features as the electric ventilator 40 previously described. In an alternative embodiment there is made provision that the air flow 70 necessary for cooling the electronic components 11 may be generated without using a ventilator 40, 41. There may, for example, be used the headwind generated by a moving vehicle, e.g. a motorcycle, as air flow 70 for cooling the electronic components 11 mentioned above.
