Compact cooling device with radial fan adhesively bonded to a heat sink

Abstract

In order to give an especially compact, cost-effective and electromagnetically compatible design to a cooling device with a heat sink and a radial fan arranged in or on the receiving area of the heat sink, the bushing is adhesively bonded onto the heat sink in or on the receiving area, or the bushing is integrally designed with the heat sink.

Claims

1. A cooling device, comprising: a heat sink, a receiving area on one half of the heat sink, and extending over an entire width of the heat sink, a fan arranged in or on the receiving area, wherein the fan is designed as a radial fan, wherein the fan is mounted in a bushing by means of a fan bearing, wherein the bushing includes a plate having at least one through passage, wherein the bushing is adhesively bonded onto the heat sink in or on the receiving area via an adhesive layer between the plate and the heat sink, wherein a recess is formed in a floor plate of the heat sink in the receiving area, wherein the plate of the bushing is situated in the recess, wherein at least one projection is arranged in the recess, wherein no through passage through the heat sink is arranged in the receiving area in an area covered by the fan on the heat sink; wherein the heat sink has several cooling ribs; and wherein a wall separates the receiving area from the area in which the cooling ribs are arranged, such that the air flow generated by the fan is not directly relayed between individual cooling ribs, but rather guided to the cooling ribs along the wall, wherein the wall is solidly continuous with no through passages provided in the area against the ribs and moving air from the fan is guided only by the wall; wherein the receiving area beyond the wall is free from any air guiding elements and airflow in the receiving area is unaffected by airflow from the fan; wherein the wall has a spiral geometry; and, wherein the distance between the bushing and the wall varies in size at several locations along the wall.

2. The cooling device according to claim 1, wherein the plate is annular in design, and has both an internal diameter and an external diameter, wherein the external diameter is larger than a diameter of a bushing opening for accommodating the fan bearing.

3. The cooling device according to claim 2, wherein the internal diameter of the annularly designed plate essentially corresponds to the diameter of the bushing opening for accommodating the fan bearing.

4. The cooling device according to claim 2, wherein the external diameter of the annularly designed plate is smaller than a propeller fan diameter of the fan.

5. The cooling device according to claim 1, wherein a thickness of the plate is smaller than half the length of the bushing.

6. The cooling device according to claim 1, wherein the bushing has plastic or consists of plastic.

7. The cooling device according to claim 1, wherein the adhesive layer has a thickness of between 0.5 mm and 2 mm.

8. The cooling device according to claim 1, wherein the adhesive layer has a reaction adhesive or consists thereof.

9. The cooling device according to claim 1, wherein the Adhesive layer has a sponge rubber or consists thereof.

10. The cooling device according to claim 1, wherein the heat sink has several cooling ribs that border the receiving area.

11. The cooling device according to claim 1, wherein the receiving area is at least partially enveloped by a regionally continuous wall.

12. The cooling device according to claim 11, wherein the wall has an arcuate progression, and is designed to guide and accelerate the air flow.

13. The cooling device according to claim 11, wherein the wall at least regionally has a spiral geometry.

14. The cooling device according to claim 11, wherein a distance between the bushing and wall varies at several locations along the wall.

15. The cooling device according to claim 11, wherein a distance between the bushing and wall along the wall continuously increases at least in a second area in the rotational direction of the fan.

16. The cooling device according to claim 15, wherein the second area includes a circular segment over an angle of more than 180°.

17. The cooling device according to claim 1, wherein no through passage is arranged through the heat sink in the receiving area.

18. The cooling device according to claim 1, wherein the receiving area and fan are at least regionally covered by a single cover.

19. A cooling device, comprising: a heat sink having a floor plate; a receiving area on a portion of the heat sink and extending across an entire width of the heat sink, the receiving area including a recess having at least one projection; and a bushing having a plate, the plate having at least one through passage; a radial fan mounted in the bushing by means of a fan bearing; wherein the plate of the bushing is received in the recess in the floor plate of the heat sink in the receiving area such that the at least one projection is received in the at least one through passage; wherein the plate of the bushing is adhesively bonded to the receiving area of the heat sink via an adhesive layer between the plate and the heat sink so that the fan is arranged in or on the receiving area of the heat sink; wherein the receiving area of the heat sink is devoid of any through passage in an area covered by the fan; wherein the heat sink has several cooling ribs; and wherein a solid and continuous wall with no through passages provided in the area against the ribs and with at least regionally a spiral geometry separates the receiving area from the area in which the cooling ribs are arranged, such that the air flow generated by the fan is guided solely by the wall, not directly relayed between individual cooling ribs, but rather guided to the cooling ribs along the wall; and, wherein the airflow in the receiving area is unaffected by airflow from the fan, said receiving area further lacking any air guiding elements.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will now be exemplarily explained in relation to the accompanying drawings based upon especially preferred embodiments.

(2) Schematically shown on:

(3) FIG. 1: is a perspective view of an active cooling device,

(4) FIG. 2: is a top view of an active cooling device,

(5) FIG. 3: is a top view of a cooling device with fan removed,

(6) FIG. 4a: is a perspective view of a cooling device with adhesively bonded bushing and with fan removed,

(7) FIG. 4b: is a perspective view of a cooling device with integrated bushing and with fan removed,

(8) FIG. 5: is a perspective view of a heat sink for an active cooling device, and

(9) FIG. 6a to FIG. 6c: are views of a bushing for mounting a fan and for connecting the fan on the heat sink.

PREFERRED EMBODIMENTS OF THE INVENTION

(10) FIG. 1 shows a perspective view of an active cooling device 100 with a fan 11 adhesively bonded onto a heat sink 10 in a receiving area 12. The fan 11 is here mounted without any separate fan housing in a bushing 13 (not depicted on FIG. 1) and adhesively bonded onto the heat sink 10 via this bushing 13.

(11) The receiving area 12 is arranged in one half of the heat sink 10, and extends regionally over the entire width of the heat sink 10. Longitudinally directed cooling ribs 22 arranged parallel to each other are located in the area of the other half of the heat sink 10. The cooling ribs 22 border the receiving area 12 or wall 23 designed like an arc that runs around the receiving area 12. The wall 23 is essentially shaped like a spiral coil, so that the wall 23 or the receiving area 12 has a spiral geometry.

(12) FIG. 2 presents a top view of the active cooling device 100 from FIG. 1. Recorded on FIG. 2 is the diameter 21 of the propeller wheel along with the rotational direction 25 of the propeller wheel. As evident from FIG. 2, the spiral geometry of the receiving area 12 or the wall 23 running around the receiving area 12 causes the distance between the fan 11 and wall 23 to increase along the wall 23 in the rotational direction 25 of the fan. In addition, the bushing 13 or plate 15 of the bushing 13 is covered by the fan 11 as viewed from above on the active cooling device 100, and thus not visible on FIG. 2, since the plate 15 has a smaller external diameter 18 than the propeller wheel.

(13) FIG. 3 presents a top view of the cooling device 100, wherein the fan 11 was removed to provide a better overview. As a consequence, the bushing 13 arranged in the receiving area 12 is visible on FIG. 3, and adhesively bonded onto the heat sink 10. To this end, an adhesive layer 90 (depicted on FIG. 6B) is arranged on the bottom side of the plate 15 of the bushing 13, and thus between the plate 15 and heat sink 10. The plate 15 is annular in design, spaced radially apart from the outer wall of the bushing 13, and forms a planar contact surface for placing the bushing 13 onto the heat sink 10. The plate 15 has two through passages 32, through which projections 29a, 29b of the heat sink 10 protrude.

(14) The distance between the wall 23 and bushing 13 increases in the rotational direction 25 of the fan 11 (not depicted on FIG. 3) at least along an area that includes a circular segment over an angle 27.

(15) FIG. 4a presents a perspective view of the cooling device 100 from FIG. 3, and thus with the fan 11 removed.

(16) FIG. 4b shows an embodiment of a cooling device 100, wherein the bushing 13 is integrally designed with the heat sink 10, and thus integrated into the heat sink 10. To this end, the heat sink 10 has a protruding hollow body in or on the receiving area 12 in the form of a pipe or pipe section, which comprises the bushing 13. Arranged in the receiving area 12 is a heat sink through passage 33 in the form of a hole through a floor plate of the heat sink 10, which is completely enveloped by the bushing 13. The fan 11 can be clipped and/or pressed into this integrated bushing.

(17) FIG. 5 shows the heat sink 10 of an active cooling device 100. Arranged inside of the recess 28 are two projections 29a, 29b for fixing and positioning the bushing 13 (not depicted on FIG. 5). The bushing 13 with its plate 15 is arranged in the recess 28 and adhesively bonded onto the heat sink 10.

(18) FIGS. 6a to 6c show the bushing 13 with the annularly designed plate 15. FIG. 6a presents a perspective view of the bushing 13. FIG. 6b presents a side view and FIG. 6c a view of the bottom side of the bushing 13. The bushing 13 has a bushing opening 19 with a diameter 20. The fan 11 (not depicted on FIGS. 6a to 6c) is mounted in the bushing opening 19. The diameter 20 of the bushing opening 19 essentially corresponds to the internal diameter 17 of the annularly designed plate 15.

(19) The annularly designed plate 15 provides two circular through openings 32. The plate 15 has a thickness 30 which is many times smaller than the entire length 31 of the bushing 13.

REFERENCE LIST

(20) 100 Cooling device

(21) 10 Heat sink

(22) 11 Fan

(23) 12 Receiving area

(24) 13 Bushing

(25) 14 Front end of the bushing

(26) 15 Plate

(27) 16 Adhesive layer

(28) 17 Internal diameter of the annular plate

(29) 18 External diameter of the annular plate

(30) 19 Bushing opening

(31) 20 Diameter of the bushing opening

(32) 21 Propeller fan diameter

(33) 22 Cooling ribs

(34) 23 Wall

(35) 24 Distance between the bushing and wall

(36) 25 Rotational direction of the fan

(37) 26 Area

(38) 27 Angle

(39) 28 Recess

(40) 29a, 29b Projection

(41) 30 Thickness of the plate

(42) 31 Length of the plate

(43) 32 Through passage

(44) 33 Heat sink through passage