Patent Application
20070246205
The present invention relates to a heat dispensing device having a protrusion with radially arranged fins so as to increase contact area with the coolant so as to increase the efficiency of removing heat from the heat source.
A conventional heat dispensing device removes heat from heat source generally by air or coolant which is in liquid status. As shown in
As shown in
The present invention relates to a heat dispensing device which comprises a base having a recessed space and a protrusion extends from an inside defining the recessed space and a plurality of fins radially located in the recessed space with the protrusion located at a center of the radially arranged fins. An inlet tube and an outlet tube extend from an outer periphery of the base and communicate with the recessed space. A first chamber and a second chamber are respectively in communication with the recessed space and the inlet and outlet tubes. A guide disk is located on the fins and has a central passage. The guide disk is positioned between a plurality of positioning members in the recessed space. The guide disk further includes a first pairs of rails and a second pair of rails. A cover is mounted on the base with a seal member clamped therebetween. A first groove and a second groove are defined in an underside of the cover. A third chamber communicates with the first groove, and a fourth chamber communicates with the second groove. The coolant flows in the base via the inlet tube and flows on the disk and then enters the central passage toward the protrusion. The coolant is guided by the protrusion and flows radially through the paths between the fins and then flow out from the outlet tube.
The present invention intends to provide a heat dispensing device wherein the coolant flows directly toward the center of the heat source and the coolant flows out from the device radially so that the heat dispensing device is compact and has high efficiency.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
Referring to FIGS. 1 to 3, the heat dispensing device of the present invention comprises a base 1 having a height and a recessed space is defined in the base 1. A substantially cone-shaped protrusion 11 extends from an inside defining the recessed space and a plurality of fins 12 radially located in the recessed space, such that the protrusion 11 is located at a center from which the fins 12 extend radially. A first positioning member 17, a second positioning member 18 and two third positioning member 19 extend radially inward from an inner periphery of the recessed space of the base 1. An inlet tube 15 and an outlet tube 16 extend from an outer periphery of the base 1 and communicate with the recessed space. A first chamber 13 is located in communication between the inlet tube 15 and the recessed space, and a second chamber 14 is located in communication between the outlet tube 16 and the recessed space. The base 1 includes a plurality of first lugs 10 extending from an outer periphery thereof and each first lug 10 has a first hole 101 defined therethrough.
A circular guide disk 2 is located on the fins 12 and has a central passage 21 which is located corresponding to the protrusion 11 of the base 1. A first pairs of rails 22 and a second pair of rails 23 extending from a top of the guide disk 2. The guide disk 2 is retained between the first positioning member 17, the second positioning member 18 and the two third positioning members 19 as shown in
A cover 3 is mounted on the base 1 with a seal member 4 clamped therebetween so as to prevent coolant from leakage. The cover 3 includes a plurality of second lugs 35 extending from an outer periphery thereof and each second lug 35 has a second hole 351, so that the cover 3 is fixedly mounted to the base 1 by extending connection members such as bolts (not shown) through the aligned first and second holes 101, 351. A first groove 31 and a second groove 32 are defined in an underside of the cover 3. A third chamber 33 communicates with the first groove 31 and a fourth chamber 34 communicates with the second groove 32. The first groove 31 and the second groove 32 in the underside of the cover 3 are respectively cooperated with the first and second pairs of rails 22, 23 to form two paths. The first chamber 13 is in communication with the third chamber 33 and the second chamber 14 is in communication with the fourth chamber 34 so as to form two independent and well sealed spaces.
Referring to FIGS. 4 to 9, the heat dispensing device is put on a heat source 5 so that the heat is conducted to the protrusion 11 and the fins 12. The coolant is introduced into the recessed space via the inlet tube 15 and flows through the first chamber 13, the third chamber 33, the path formed by the first pairs of rails 22 and the first groove 31 between the top of the guide disk 2 and the cover 3, and then enters the central passage 21 toward the protrusion 11 which guides the coolant to the paths between the fins 12 in radial direction. The coolant then flows through spaces defined between the guide disk 2 and the inner periphery of the recessed space of the base 1, and flows to the second and fourth chambers 14, 34 via the path formed by the second pair of rails 23 and the second groove 32. The coolant finally flows out from the outlet tube 16 and brings the heat away from the heat source 5.
It is noted that the coolant is guided by the protrusion 11 and evenly and radially flows through the paths between the fins 12. The contact area to the coolant is large enough and there is no corner to trap the coolant so that the efficiency can be increased. Besides, the coolant introduced into the base 1 directly flows to the protrusion 11 which is located at the position that carries the highest temperature and the direction of the coolant flows is parallel to the change of the temperature. This can obtain a maximum efficiency according to the theory of heat conduction. The coolant flows toward the protrusion 11 via the central passage 21 and the protrusion 11 has smooth and curve surface so that the coolant does not generate bubbles which impede the heat transfer. The size of the heat dispensing device is small while includes multiple fins 12 and efficient arrangement so that it can be used for laptops and the coolant can even driven by small pump to increase the speed of the coolant.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
