Heat sink
A heat sink absorbs heat from a chip or other component (32) and transfers the heat to a cooling fluid (36). The sink has a shaped part (22″) on which are formed at least one element (56″) for supplying cooling fluid (36) and at least one element (62″) for removing cooling fluid (36). The heat sink has a heat absorber (68″) with a heat-absorption side (112u) that absorbs heat during operation and a heat-transfer side (78) in contact with the cooling fluid (36) during operation. The absorber has a depression (118) in which are arranged a plurality of elongated thermally conductive elements (84″) which are each connected at a first end to the depression (118), and each have a free end (78) projecting away from the depression (118). Optionally, the heat sink can be coupled to a radiating or cooling unit (38), a fluid-circulating pump (39) and a fan (40) for directing air over the cooling unit, in order to quickly dissipate the heat transferred to the cooling fluid (36).
Latest Patents:
to related German patent applications, the disclosures of which are incorporated by reference: DE 20 2004 005 241, filed 26 MAR. 2004; DE 20 2004 019 084, filed 27 NOV. 2004; and DE 20 2004 019 852.5, filed 15 DEC. 2004.
FIELD OF THE INVENTIONThe invention relates to a heat sink for absorbing and removing heat from a power component, e.g. a microprocessor, a microcontroller, an ASIC (Application-Specific Integrated Circuit), a laser, or the like. The invention is similarly suitable for the cooling of power components having a high heat flux density.
BACKGROUNDPower electronics components that require cooling must not heat up above specific limit temperatures. Because reduced conductor widths also mean that the surface area of processors or other components is becoming ever smaller, the result is a sharp increase in the density of the heat flux to be discharged, i.e. the heat flux density. This makes it more difficult to apply the principle of so-called heat spreading, since regions inside a heat sink that are remote from the component that is to be cooled can contribute effectively to heat transfer only if their temperature is significantly higher than the temperature of the cooling fluid flowing past them. The flow velocities must also be sufficiently high, and the thermal boundary layers consequently sufficiently thin, to allow heat to be discharged effectively.
SUMMARY OF THE INVENTIONIt is an object of the invention to provide a novel heat sink.
The invention provides a heat sink through which a cooling fluid flows during operation, and which offers a large surface area. In the heat sink, cold cooling fluid initially encounters regions having high absolute temperatures. Advantageously, it is possible largely to prevent mixing between cooling fluid that has already heated up and fresh, cold cooling fluid, before the latter encounters regions having the highest absolute temperatures. The regions having the highest absolute temperatures can also experience high incident flow velocities of the cooling fluid, so that turbulent flow, and consequently optimum heat transfer, can be obtained there.
For that purpose, there are arranged, in a depression or cavity, a plurality of thermally conductive elements that project from the bottom of that depression into the path of the cooling fluid, so that the latter thereby flows around them during operation. This yields a corresponding enlargement of the heat-transferring surfaces. The thermally conductive elements and their interstices preferably have dimensions that can be produced using economical methods, e.g. by milling, electrodischarge machining methods, casting methods, forming, stamping, pressing, etc. It has also been found that heat transfer to the cooling fluid can be favorably influenced by a suitable surface treatment, preferably by sandblasting.
The contour of the depression, which can also be referred to as a concave configuration, basin, or cavity, can be adapted to the requirements of a substrate that is to be cooled. A cavity in the shape of a part of a sphere (calotte), for example, can easily be manufactured by milling. Rotational conic sections can alternatively be used, for example a cavity in the shape of a rotational paraboloid or the like.
The housing of a heat sink of this kind can comprise attachment capabilities, with which the housing can be mounted onto existing attachment points.
The inlet element preferably has at its outlet a nozzle field that can comprise, for example, round nozzles or slit nozzles. The cooling fluid is accelerated as it flows through such a nozzle field. As a result, the cold cooling fluid has a high velocity when it encounters regions having high absolute temperatures.
The nozzle field can also cause a portion of the cooling fluid to be deflected as it flows through the nozzle field, which can be considered a result of the so-called Coanda effect (named for Henry Coanda, 1886-1972). By exploiting this effect, portions of the cold cooling fluid can be directed in controlled fashion onto regions of the thermally conductive elements located farther out, thus improving heat transfer.
BRIEF FIGURE DESCRIPTIONFurther details and advantageous refinements of the invention are evident from the exemplifying embodiments, not to be understood as a limitation of the invention, that are described below and depicted in the drawings, in which:
As depicted e.g. in
This heat flux 34 must be absorbed by heat sink 20 and transferred via a cooling fluid 36 (
Cooling unit 38, the nature of cooling fluid 36, and the further manner in which heat is removed (whether via air or a different fluid) are not part of the present invention and are therefore indicated here only to the extent that appears useful for an understanding of the invention and its context.
Upper part 22 (
As
At its left (in
According to
Cylindrical opening 46 (
Part 68 is manufactured from a material having good thermal conductivity, e.g. copper, aluminum, or silver. The nature of the material used depends, inter alia, on the application and on requirements in terms of service life and operating reliability. As is evident from the various figures, in this example part 68 generally has the shape of a round plate having a flat lower side 76 and an upper side 78, parallel thereto, into which is recessed a depression whose general three-dimensional contour corresponds to the shape of a trough or basin. Lower side 76 is precision-machined to produce optimum thermal contact with substrate 32, a thermoconductive paste 80 usually being arranged between lower side 76 and substrate 32 in order to optimize heat transfer. Experiments have shown that, for high heat flux densities, the thickness of the bottom of part 68 should be as thin as is compatible with mechanical stability.
The trough-shaped depression 82 is arranged so that, in use, its center is located substantially above the center of substrate 32. Depression 82 here has approximately the shape of a part of a sphere or “calotte” but other shapes for this concave structure are also possible, e.g. a rotational paraboloid, or the shape of a flat bowl having a substantially flat bottom.
As is best shown by
There are of course different ways to produce columnar cooling elements 84 of this kind, e.g. also by means of suitable electrodischarge machining tools, with which it is possible to achieve an irregular profile for conduits 86 and thereby to influence the flow conditions in a controlled manner so that heat discharge occurs in largely symmetrical and therefore optimized fashion.
As already described, the depression 82 represents an enveloping body that is interrupted by pins 84. In this embodiment, depression 82 ends before the cylindrical periphery 70 of cooling plate 68, so that a flat rim segment 90 is created there. Together with lower side 50 of upper part 22, cylindrical recess 46, and protrusion 52, it forms an annular conduit 92 that intersects at the left (in
As a result, heated cooling fluid 64 is directed around the central portion of cooling plate 68 and consequently cannot mix with cold cooling fluid 36 that is supplied through supply fitting 56 to the central portion (inside ring 52). There consequently exists, inside ring 52, a zone with very cold cooling fluid 36 which serves to provide the most intense cooling of substrate 32 (
Different kinds of nozzles can, of course, be used.
During operation, under specific flow conditions that are easy to ascertain empirically, nozzles 58, 58′ cause a constriction of the inflowing cooling fluid 36. The latter flows more quickly as a result, and upon encountering cooling elements (pins) 84 brings about intense turbulence and consequently better heat transfer.
Mode of Operation
During operation, cooled cooling fluid 36 is supplied from cooling unit 38 to supply fitting 56 and sprayed at high velocity through nozzle field 59 (
The cooling fluid flows outward through conduits 86 (
From conduits 86, heated cooling fluid 64 travels into annular conduit 92, and through the latter via outlet opening 61 to outflow conduit 60 and back to cooling device 38 where it discharges its heat, for example, to the ambient air, as indicated by fan 40.
It should be noted that it is also possible to use as the cooling fluid, for example, a boiling cooling fluid which evaporates at a temperature that is below the maximum temperature of substrate 32 that is to be cooled.
The trough-shaped depression 82 yields the additional advantage that heat sink 20 is insensitive to the slightly oblique positions that often occur in practical use, for example, in a computer; this is because, as indicated by arrows 34 in
What is obtained, by means of the present invention, is thus a heat sink 20 through which a cooling fluid flows, which offers a large surface area, and in which cold cooling fluid first encounters regions having high absolute temperatures. The invention prevents already-heated cooling fluid 64 from mixing with fresh, cold fluid 36, before the latter encounters the regions having the highest absolute temperatures. This means, conversely, that already-heated fluid is withdrawn as quickly as possible from areas having the highest absolute temperatures. In addition, the regions having the highest absolute temperatures also experience an incident flow of cooling fluid 36 at high flow velocities.
As one skilled in the art may gather from
Ring 52, acting as a stopper, counteracts this and forces cooling fluid 36 to flow in all directions and thereby to cool cooling plate 68 more homogeneously. If ring 52 has the same dimensions everywhere as depicted in
For this reason, in
Protrusions 100 are so configured that they project, in
As described with reference to
A heat sink 20 of this kind can be manufactured on the whole very inexpensively, since upper housing part 22 with its complicated shape can be manufactured inexpensively as an injection-molded part, and can be optimized for the requirements of a specific processor type. Pins 84 of cooling plate 68, and their interstices 86, preferably have dimensions that can be manufactured using economical production methods, e.g. a width for pins 84 on the order of less than 2 mm. The same is true analogously for the arrangement according to
The inserted cooling plate 68 has a shoulder or annular groove 72 that makes available some of the sealing edges for fluid-tight sealing between upper part 22 and cooling plate 68. At least one other sealing edge (annular groove 66) is made available by upper part 22. Upper part 22 has at least one inlet fitting 56 and at least one outlet fitting 62. Inlet fitting 56 is located at the center, and outlet fitting 62 intersects with its center axis approximately the outer rim of annular conduit 92. The interpenetration of the elements resulting therefrom yields a rectangular outlet 61 out of annular conduit 92, and this outlet has a large cross section and consequently a low flow resistance. The corner edges of the interpenetration can be rounded off for further reduction of the flow resistance.
Inlet fitting 56 preferably has, at its inner end, a diaphragm 59, in which round nozzles 58 or slit-shaped nozzles 58′ can be provided, so as to define a nozzle field. Cooling fluid 36 is accelerated as it flows through this nozzle field 59 or 59′, and the fluid stream is in fact constricted even further after exiting from the nozzle field (Coanda effect), resulting in a further increase in flow velocity. Cold cooling fluid 36 thus has a high velocity when it encounters regions having high absolute temperatures. In addition, the surfaces are enlarged in a balanced relationship by way of pins 84. Corresponding ribs could also be used instead of pins 84; this is not depicted.
Ring 52 forces cooling fluid 36 to flow through at the foot of pins 84, and only small flow resistances are subsequently imposed on the fluid in outer annular conduit 92, so that backflow and mixing with cold cooling fluid 36 is made additionally difficult. Upper part 22 can also possess, for this purpose, an outlet cross section that is larger than the inlet cross section.
The left half of
Additionally present in the right half of
The advantage in the context of
In
The lower (in
As
The arrangement of nozzles 58″ is selected so that heat is removed from cooling elements 84″ as homogeneously as possible. In
L=(1.4 . . . 2.0)*d (1),
where L and d are measured in mm. For a dimension d=0.3 mm, for example, a value L of 0.4 to 0.6 mm has proven particularly favorable, i.e. a cross section of approximately 0.1 to approximately 0.4 mm2.
Cooling elements 84″ preferably have a square cross section for ease of manufacture. If a different cross section is selected, e.g. a cylindrical cross section, the average cross section is taken as the starting point, i.e. the weighted average of the cross sections of the individual cooling elements, referred to as Q. This is usually in the range from 0.1 to 0.4 mm2. The relationship between this value and the inside width d of conduits 82″ between cooling elements 84″ is preferably constrained as follows:
d=(0.25 . . . 0.5)*exp(0.5*lnQ) (2),
where d is measured in mm and Q in mm2, and lnQ is the natural logarithm of Q.
This therefore yields, based on present knowledge, a preferred value range for the value d when Q is known.
As the size of an electronic power component 32 to be cooled decreases, its heat flux density usually increases, and it is then necessary to adapt the size of cooling elements 84″, i.e. parts 84″ become even smaller and, according to equation (1), the width of conduits 82″ also becomes even smaller. Diameter D of nozzles 58″ also decreases correspondingly in this case.
Round nozzles 58″ have a preferred diameter D of approximately 1 to approximately 1.2 mm. The distance h noted in
h=(2 . . . 3)*D (3),
i.e. for optimum results, this distance h is approximately two to three times the diameter D of a nozzle 58″. This distance h is in any case greater than D. (Diameter D is normally approximately the same for all nozzles 58″, in the interest of simple manufacture. The depiction in
The preferred vertical center-to-center spacing a between two adjacent nozzles is obtained from the dimensions indicated, i.e.
a=n*L+n*d (4)
where n=2, 3, . . .
If n=2 (as depicted), then
a=2*0.6+2*0.3=1.8 mm (5).
In comparative tests, these dimensions resulted in very good heat removal from component 32 indicated schematically in
Each two adjacent nozzles 58″ of center row 96 form an isosceles triangle with one adjacent nozzle of row 98 or row 100, the length s of the sides being
s=1.12*a (6).
In comparative tests, an arrangement of this kind has proven effective for removing the quantity of heat that is produced in such a way that local temperature peaks do not occur.
Located at the lower (in
Heat absorption part 68″ preferably has approximately the shape of a disk, and has on its lower side a cylindrical protrusion 110 on which is located a rectangular protrusion 112 that, during use, rests with a surface 112u against a heat-emitting part, e.g. against an IC or a microprocessor, as depicted in
Heat absorption part 68″ is retained by a supporting part, here in the shape of a retaining plate 114 (
Upper part 22″ has, at its four corners, four attachment holes 117, each of which has a hollow-cylindrical extension 117A that, as shown in
Heat absorption part 68″ is thereby largely relieved of load-bearing functions, and in its central part, i.e. in the region of rectangular protrusion 112, can be very thin, having for example, as depicted, a thickness of less than 1 mm in the central region; this is very advantageous in terms of good cooling, since excellent heat transfer is obtained as a result.
Heat absorption part 68″ has, on its upper (in
Located at the deepest point of spherical cavity 118 in
Longitudinal axes 126 of nozzles 58″ preferably extend through the center planes of valleys 82″h (cf.
Radially outside those cooling elements 84″ that are located directly beneath nozzle plate 59″, an annular protrusion 128 of upper part 22″ is in contact against cooling elements 84″ there, so that during operation, the cooling fluid cannot flow away over the cooling elements 84″ there but instead must flow between them through valleys 82″. This prevents cold and hot cooling fluid from mixing, which would reduce the cooling efficiency.
Located radially outside annular protrusion 128 are cooling elements 84″x whose height increases toward the outside, additionally improving heat transfer there.
As is particularly apparent from
Reinforcing ribs 130 are provided on the upper side of upper part 22″, partly in order to enhance the mechanical stiffness of upper part 22″ and partly to give it a pleasant appearance that identifies its origin.
As
Many variants and modifications are possible within the scope of the present invention. For example, the cooling fluid can also flow through the heat sink in the opposite direction, for example when substrate 34 to be cooled requires more intense cooling in its outer regions than in its central regions. These and similar modifications are embraced within the capabilities of one skilled in the art.
Claims
1. A heat sink for absorbing heat from a component (32) and for removing heat by means of a cooling fluid (36), said heat sink comprising:
- a supply element (56) for supplying cooling fluid (36) to the heat sink;
- a removal element (62, 63) for removing cooling fluid (36) from the heat sink;
- a heat absorber (68; 68′; 68″) in which one side is implemented for the absorption of heat and another side (78), in contact with the cooling fluid (36) during operation, is formed with a depression (82; 82′; 82″) having depths ranging from a shallowest region to a deepest region, in which depression are arranged a plurality of thermally conductive elements (84), each having a fixed end and a free end, and which are connected in thermally conductive fashion, at their ends adjacent the depression (82; 82′; 82″), to the bottom of that depression (82), and whose free ends (78) project outwardly with respect to the depression (82; 82′; 82″);
- the supply element (56) being configured in order, during operation, to deliver cooling fluid to the depression (82; 82′; 82″) in the vicinity of its deepest region,
- the supply element being formed, for delivery purposes, with at least one exit opening (58) that is arranged at a predetermined minimum distance from the free ends (78) of the thermally conductive elements (84).
2. The heat sink according to claim 1,
- wherein a nozzle field (59; 59′; 59″) is arranged adjacent an outlet of the cooling fluid (36) from the supply element (56).
3. The heat sink according to claim 2,
- wherein said nozzle field comprises a plurality of round nozzles (58″) that have a predetermined diameter (D) and the nozzle field (59; 59′; 59″) is at a distance (h) from the bottom (82″) of the depression that is greater than said predetermined diameter (D).
4. The heat sink according to claim 3,
- wherein said distance (h) is within a range between two times said diameter and three times said diameter (D).
5. The heat sink according to claim 2, wherein the nozzle field (59′) comprises slit-shaped nozzles (58′).
6. The heat sink according to claim 2, wherein said nozzle field (59′) comprises a plurality of parallel-aligned nozzles.
7. The heat sink according to claim 1, wherein the depression (82) has the shape of a calotte.
8. The heat sink according to claim 1, wherein the depression (82) has a shape defined by a rotated conic section.
9. The heat sink according to claim 1, wherein each thermally conductive element (84) has a respective shape selected from the group consisting of a pin, a rib and a column.
10. The heat sink according to claim 1,
- wherein, to facilitate egress of cooling fluid (64) heated, during operation, adjacent said depression (82; 82′; 82″), there is provided, around said depression, an annular conduit (92, 122) that is connected to an outflow element (62, 63, 62″) for the cooling fluid.
11. The heat sink according to claim 1, further comprising
- a housing part (22), wherein said heat absorber (68), formed with said depression (82; 82′; 82″), is arranged in an opening (46) of said housing part (22), and is sealed with respect to said housing part by at least one sealing member (74).
12. The heat sink according to claim 11,
- wherein said supply element (56) and at least one outflow element (62, 63) are arranged in said housing part (22).
13. The heat sink according to claim 11, wherein said housing part (22) is implemented as an injection-molded part.
14. The heat sink according to claim 1, wherein at least one surface that is, during operation, in contact with the cooling fluid is roughened to facilitate heat transfer.
15. The heat sink according to claim 1, wherein
- there is provided, opposite the thermally conductive elements (84) arranged in the depression (82; 82′; 82″), at least one flow-directing element (52) that, in coaction with the thermally conductive elements (84), defines, for said cooling fluid (36), different flow resistances at different points of the heat absorber (68).
16. The heat sink according to claim 15,
- wherein the flow-directing element (52) is ring-shaped.
17. The heat sink according to claim 16, wherein
- the ring (52) is arranged around a supply opening for the cooling fluid (36).
18. The heat sink according to claim 15,
- wherein the at least one flow-directing element (52) comprises a chamfer (53) along at least one portion thereof, in order to influence resistance to flow of said fluid.
19. The heat sink according to claim 15, wherein
- the at least one flow-directing element (52) is formed, at at least one point, with a protrusion (100) that projects between free ends (78) of two adjacent thermally conductive elements (84).
20. The heat sink according to claim 1, wherein
- said supply element (56) is aligned centrally with respect to said heat absorber, in order to supply cooling fluid (36) to the heat absorber (68) approximately in its center; and
- at least one outflow element (62, 63) opens at a periphery (90, 122) of said depression (82; 82′; 82″).
21. The heat sink according to claim 20, wherein
- a plurality of outflow elements (62, 63) are provided, arranged substantially symmetrically with respect to the supply element (56), in order to bring about, during operation, a substantially symmetrical flow of cooling fluid (36) across the heat absorber (68).
22. A heat sink for absorbing heat from a component (32) and for removing heat by means of a cooling fluid (36), said heat sink comprising:
- at least one supply element (56) for supplying cooling fluid (36) to the heat sink;
- at least one removal element (62, 63) for removing cooling fluid (36) from the heat sink;
- a heat absorber (68; 68′; 68″) in which one side is implemented for the absorption of heat and another side (78), in contact with the cooling fluid (36) during operation, is formed with a depression (82; 82′; 82″), in which are arranged a plurality of thermally conductive elements (84; 84′; 84″) which are connected in thermally conductive fashion, at their ends adjacent the depression (82; 82′; 82″), to the bottom of that depression (82; 82′; 82″), and whose free ends (78) project away from the depression (82);
- the at least one supply element (56) being configured in order, during operation, to deliver cooling fluid to the depression (82; 82′; 82″) in its deepest region,
- the supply element being formed, for delivery purposes, with at least one exit opening (58) that is arranged at a predetermined minimum distance from the free ends (78) of the thermally conductive elements (84);
- there being arranged, in the region of the exit opening, a nozzle field (59; 59′; 59″) having nozzles (58″) which are arranged so that a stream (36″) of cooling fluid exiting from a nozzle (58″) is directed onto a valley (82″cr) between two adjacent thermally conductive elements (84″).
23. The heat sink according to claim 22,
- wherein the width (d) of the valleys (82″h, 82″v) falls within a range from 0.2 to 0.4 mm.
24. The heat sink according to claim 23,
- wherein a nozzle (58″) is arranged so that a stream (36″) of cooling fluid exiting from it is directed onto a location (82″cr) between four adjacent thermally conductive elements (84″).
25. The heat sink according to claim 22, wherein the thermally conductive elements (84; 84′; 84″) are shaped like needles, which have an average cross section and are separated from one another by depressions in the form of valleys (82″h, 82″v) whose inside width (d) is within a range defined by d=(0.25... 0.5)*exp(0.5*lnQ),
- where
- d=inside width of a valley in millimeters,
- Q=average cross section of a thermally conductive element (84″) in square millimeters;
- ln=natural logarithm or base-e logarithm.
26. The heat sink according to claim 22,
- wherein the nozzle field (59; 59′; 59″) is at a distance (h) from the bottom (82″) of the depression that, in the context of round nozzles (58″) that have a predetermined diameter (D), is greater than that diameter (D).
27. The heat sink according to claim 26,
- wherein that distance (h) falls within a range between two times that diameter (D) and three times that diameter (D).
28. The heat sink according to claim 22, wherein the nozzle field (59′) comprises slit-shaped nozzles (58′).
29. The heat sink according to claim 22, wherein the depression (82) has the shape of a calotte.
30. The heat sink according to claim 22, wherein the depression (82) has a shape defined by a rotated conic section.
31. The heat sink according to claim 22, wherein each thermally conductive element (84) has a respective shape selected from the group consisting of a pin, a rib and a column.
32. The heat sink according to claim 22,
- wherein, to facilitate egress of cooling fluid (64) heated, during operation, adjacent said depression (82; 82′; 82″), there is provided, around said depression, an annular conduit (92, 122) that is connected to an outflow element (62, 63, 62″) for the cooling fluid.
33. The heat sink according to claim 22, further comprising
- a housing part (22) formed with an opening (46), said heat absorber (68) being arranged in said opening (46) and being sealed with respect to said opening by at least one sealing member (74).
34. The heat sink according to claim 33, further comprising at least one supply fitting (56) and at least one outflow element (62, 63) arranged in said housing part (22).
35. The heat sink according to claim 33, wherein said housing part (22) is formed by injection-molding.
36. The heat sink according to claim 22,
- wherein there is provided, opposite the thermally conductive elements (84) arranged in the depression (82; 82′; 82″),
- at least one flow-directing element (52) that, in coaction with the thermally conductive elements (84), defines for said cooling fluid (36) different flow resistances at different points of the heat absorber (68).
37. The heat sink according to claim 36,
- wherein said flow-directing element (52) is arranged around a supply opening for the cooling fluid (36).
38. The heat sink according to claim 36, wherein
- the at least one flow-directing element (52) comprises a chamfer (53) along at least one portion thereof, in order to influence resistance to flow of said fluid.
39. The heat sink according to claim 36,
- wherein the at least one flow-directing element (52) is formed with a protrusion (100) that projects between the free ends (78) of two adjacent thermally conductive elements (84).
40. The heat sink according to claim 22, wherein
- said supply element (56) is aligned centrally with respect to said heat absorber, in order to supply cooling fluid (36) to the heat absorber (68) approximately in its center; and
- at least one outflow element (62, 63) opens at a periphery (90, 122) of said depression (82; 82′; 82″).
41. The heat sink according to claim 40,
- wherein a plurality of outflow elements (62, 63) are provided which are arranged substantially symmetrically with respect to the supply element (56) in order to bring about, during operation, a substantially symmetrical flow of cooling fluid (36) in the heat absorber (68).
42. The heat sink according to claim 22,
- wherein the heat absorber (68″) comprises at least one protrusion (110, 112) projecting away from the supply element (22″),
- and a supporting part (114) is provided that is mechanically joined to the supply element (22″) and mechanically supports the heat absorber (68″) in a region outside that protrusion (110, 112).
43. A heat sink for absorbing heat from a component (32) and for removing heat by means of a cooling fluid (36),
- which heat sink comprises:
- a shaped part (22″) on which are provided at least one supply element (56″) for supplying cooling fluid (36) and at least one removal element (62″) for removing cooling fluid (36);
- a heat absorber (68″) having a heat-absorption side (112u) which, in operation, serves to absorb heat, and a cooling-fluid side (78) that is in contact with the cooling fluid (36) during operation and is formed with a depression (118), in which are arranged a plurality of thermally conductive elements (84″) that are connected in thermally conductive fashion, at their ends facing toward the depression (118), to that depression (118), and whose free ends (78) project away from the depression (118);
- at least one protrusion (110, 112), provided on the heat-absorption side of the heat absorber (68″), into which protrusion the depression (118) extends from the cooling-fluid side; and
- a retaining member (114) which comprises a recess (115) into which the at least one protrusion (110, 112) of the heat absorber (68″) projects,
- and which is joined to the shaped part (22″) in order to secure the heat absorber (68″) on the shaped part (22″).
44. The heat sink according to claim 43, wherein
- the shaped part (22″) comprises a recess (46″) into which the heat absorber (68″) projects, at least one sealing member (74″) being provided between the heat absorber (68″) and the recess (46″).
45. The heat sink according to claim 43,
- wherein said depression (118) formed in the heat absorber (68″) extends through the recess (115) of the retaining member (114) and is closed off, in liquid-tight fashion,
- by the heat-absorption side (112u) of the heat absorber (68″).
46. The heat sink according to claim 43,
- wherein the shaped part (22″) is provided with attachment recesses (117) that comprise hollow extensions (117A) which project beyond the retaining member (114) and its attachment elements (116).
47. The heat sink according to claim 46,
- wherein the attachment recesses (117) are provided at least partially on lateral protrusions (119) of the shaped part (22″).
48. The heat sink according to claim 43, wherein said depression has a generally concave shape.
Type: Application
Filed: Mar 15, 2005
Publication Date: Sep 29, 2005
Applicant:
Inventors: Wolfgang Laufer (Aichhalden), Walter Angelis (St. Georgen), Siegfried Seidler (Villingen-Schwenningen), Norbert Weisser (Niedereschach-Kappel), Christian Thren (Bad Friedrichshall)
Application Number: 11/081,471