TWI584109B - Heat sink assembly and electronic device with the heat sink assembly - Google Patents

Description

Heat sink combination and electronic device using the same

The present invention relates to a heat sink device, and more particularly to a heat sink assembly for dissipating heat from electronic components and an electronic device using the heat sink assembly.

With the rapid development of the computer industry, heat generated by heat-generating electronic components such as micro-processed wafers has become more and more. In order to dissipate this heat to ensure the normal operation of electronic components, the industry has applied a heat-conducting substrate to the electronic components to generate heat. The electronic components dissipate heat. The heat-conducting substrate is fixed to the circuit board by a fixing fastener such as a screw provided with a screw at the end and screwed to the circuit board. Prior to use of the thermally conductive substrate, the screws are typically pre-set in the perforations of the thermally conductive substrate. In the process of transportation, in order to prevent the screw from falling off from the heat-conducting substrate due to vibration or the like, a buckle having a diameter larger than the through-hole of the heat-conducting substrate is usually used to be stuck at one end of the screw through the heat-conducting substrate. Such buckles typically need to be assembled manually by specific tools, thereby increasing production costs. When the heat sink is used, when the buckle is not tightly joined, the circuit may be short-circuited and the electronic component may be burnt, thereby affecting the performance of the electronic component.

In view of the above, it is necessary to provide a combination of a heat dissipating device that is easy to assemble and cost-effective, and an electronic device that uses the heat dissipating device combination.

A heat sink assembly includes a substrate, at least one extension arm extending along the substrate, and At least one screw fastening device that cooperates with the extension arm, the extension arm is provided with at least one through hole for the screw fastener to be worn, the screw fastening device includes a pressing portion and a self-repressing portion a body having a retaining screw formed on the inner wall of the through hole, wherein the inner wall of the through hole is provided with an internal thread matched with the resisting screw, and the retaining screw of the body and the internal thread of the through hole After being screwed and passed through the through hole, it is caught on the lower side of the extension arm.

An electronic device using a combination of heat sinks includes a circuit board and a heat-generating electronic component fixed to the circuit board, the heat sink assembly comprising a substrate, at least one extending arm extending along the substrate, and mating with the extending arm At least one screw fastener, the extension arm is provided with at least one through hole for the screw fastener to be worn, the screw fastening device includes a pressing portion and a body extending from the pressing portion, and the body is formed on the body a blocking thread, the inner wall of the through hole is provided with an internal thread matching the blocking screw, and the blocking screw of the body is screwed with the internal thread of the through hole and passes through the After the through hole is stuck to the lower side of the extension arm, the substrate is attached to the heat-generating electronic component, and the screw fastener is coupled to the circuit board.

Compared with the prior art, the present invention prevents the screw fastener from being detached from the substrate by providing a retaining screw on the body of the screw fastener, which is simple and firm in assembly, and reduces material cost and assembly cost.

100‧‧‧Electronic devices

10‧‧‧ Heat sink combination

20‧‧‧Electronic components

12‧‧‧Substrate

14‧‧‧Extension arm

16‧‧‧ Screw fasteners

162‧‧‧Resistance Department

164‧‧‧ Ontology

166‧‧‧Combination Department

1662‧‧‧ external thread

1642‧‧‧Removing thread

142‧‧‧First through hole

144‧‧‧ internal thread

144a‧‧‧ internal thread

143‧‧‧Sleeve

22‧‧‧ Circuit board

24‧‧‧Fever electronic components

222‧‧‧Second through hole

224‧‧‧ internal thread

1 is an assembled, isometric view of an electronic device of the present invention.

2 is a partial cross-sectional view of the electronic device of FIG. 1 in an exploded state.

3 is a cross-sectional view of the electronic device of FIG. 1 taken along line II-II.

Please refer to FIG. 1 and FIG. 2 together, which is an assembly diagram of an electronic device 100 according to the present invention. . The electronic device 100 includes a heat sink assembly 10 and an electronic component 20. The heat sink assembly 10 is attached to the electronic component 20 to dissipate heat from the electronic component 20.

The heat sink assembly 10 includes a square substrate 12, four extension arms 14 extending outward from the four corners of the substrate 12, and four turnbuckles that cooperate with the extension arms 14 to fix the substrate 12 to the electronic component 20. With 16.

The substrate 12 is made of a material having good thermal conductivity such as aluminum, copper, or the like for contacting the electronic component 20 to absorb its heat. Each of the extending arms 14 is a thin elongated elastic body. The first extending hole 142 defines a first through hole 142. The inner wall of each of the first through holes 142 is tapped with a turnbuckle. Internal thread 144 with 16 mating.

In this embodiment, since the extension arm 14 is thin, a sleeve 143 is integrally extended downward at a lower surface of each extension arm 14 corresponding to the first through hole 142. The sleeve 143 is disposed in communication with the first through hole 142 and has a diameter equal to that of the first through hole 142. The inner wall of the sleeve 143 also has an internal thread 144a that cooperates with the screw fastener 16. Thereby, the number of threads on the extension arm 14 that cooperate with the screw fastener 16 is increased to ensure the stability of the extension arm 14 and the screw fastener 16. It can be understood that when the thickness of the extension arm 14 is large, when the number of threads of the internal thread 144 of the first through hole 142 is sufficiently large, it can be firmly engaged with the screw fastener 16, so that the sleeve 143 need not be provided.

The screw fastener 16 includes a pressing portion 162 , a joint portion 166 , and a body 164 connecting the pressing portion 162 and the joint portion 166 , and the joint portion 166 is provided with an external thread 1662 . The diameter of the pressing portion 162 is larger than the diameter of the first through hole 142 on the extension arm 14. The body 164 is a cylindrical rod body extending perpendicularly from the central portion of the pressing portion 162, and a continuous blocking screw 1642 is formed away from the outer end of the pressing portion 162. The retaining screw 1642 is adapted to the internal thread 144 in the first through hole 142 of the extension arm 14 and the internal thread 144a of the sleeve 143. The diameter of the body 164 is smaller than the diameter of the pressing portion 162 . The diameter of the joint portion 166 is smaller than the diameter of the body 164, and the outer wall thereof is tapped with a continuous external thread 1662. In other embodiments, the diameter of the joint 166 can be comparable to the diameter of the body 164.

The electronic component 20 includes a circuit board 22 and a heat-generating electronic component 24 fixed to the circuit board 22. The heat-generating electronic component 24 can be a CPU. A second through hole 222 corresponding to the first through hole 142 is disposed on the circuit board 22 at intervals around the heat generating electronic component 24. The inner wall of each of the second through holes 222 is provided with an internal thread 224 adapted to the external thread 1662 on the joint portion 166.

When the electronic device 100 is assembled, the heat sink assembly 10 is first assembled, and the specific process is as follows. First, the joint portion 166 of the screw fastener 16 is inserted into the first through hole 142 of the extending arm 14 and the sleeve 143, and the end of the body 164 is screwed into the first through hole 142 and the sleeve 143 to block the thread. 1642 is screwed with the internal thread 144 and the internal thread 144a. After the blocking screw 1642 of the body 164 is screwed into the internal thread 144, 144a and passes through the first through hole 142 and the sleeve 143, the bottom surface of the pressing portion 162 of the screw fastener 16 abuts against the upper surface of the extending arm 14, The retaining screw 1642 on the body 164 abuts against the underside of the extension arm 14. Thereby, the heat sink assembly 10 is pre-assembled. During the transportation of the heat sink assembly 10, the body 164 of the screw fastener 16 moves up and down in the space formed by the first through hole 142 and the sleeve 143 due to vibration or the like, but due to the pressing portion of the screw fastener 16 The diameter of the 162 is larger than the diameter of the body 164, and is larger than the diameter of the first through hole 142. Therefore, the pressing portion 162 acts to block the screw fastener 16 from sliding from the extension arm at the upper end; since the blocking screw 1642 on the body 164 is stuck The lower side of the extension arm 14 prevents the screw fastener 16 from falling off the extension wall at the lower end, thereby preventing the removal, and the assembly is simple and firm, thereby reducing material cost and assembly cost.

Please also refer to FIG. 3, after the pre-assembly of the heat sink assembly 10 is completed, the heat sink is enabled. The heat-generating electronic component 24 on the circuit board 22 is attached to the bottom of the substrate 12 of the combination 10, and the screw fastener 16 on the circuit board 22 corresponds to the second through hole 222 provided in the circuit board 22. Then, the screw fastener 16 is screwed downward, so that the external thread 1662 of the joint portion 166 of the screw fastener 16 is screwed with the internal thread 224 of the second through hole 222, and the pressing portion 162 and the extension arm of the screw fastener 16 are extended. After the upper surface of the 14 is closely attached, since the extension arm 14 has elasticity, when the screw fastener 16 is continuously screwed down, the extension arm 14 is deformed until the joint portion 166 is completely received in the second through hole 222, and the joint portion The joint surface of the 166 and the resisting screw 1642 is in close contact with the upper surface of the circuit board 22. Thereby, the electronic device 100 is assembled. At this time, the bottom of the substrate 12 is closely attached to the heat-generating electronic component 24, so that the heat generated by the heat-generating electronic component 24 can be quickly absorbed.

It can be understood that, in the present invention, the shape of the substrate 12 can be set to various shapes as needed, and the number of the extending arms 14 is not limited as long as it can cooperate with the screw fastener 16 to fix the substrate 12 to the circuit board 22 . Just go up. In order to increase the heat transfer efficiency, a copper block or a heat pipe may be embedded on the substrate 12, and the heat transfer effect may be improved by heat transfer between the copper block/heat pipe and the heat-generating electronic component 24.

In the embodiment, only the retaining screw 1642 is disposed at the end of the body 164 of the screw fastener 16 to be screwed into the first through hole 142 of the extending arm 14 and the internal threads 144, 144a of the sleeve 143. After that, the pre-assembly of the extension arm 14 and the screw fastener 16 can be realized, and the utility model does not need to be fixed by an additional device such as a buckle, which saves material cost and assembly cost, and the electronic device 100 does not need to worry during use. The additional appliance is short-circuited due to the loose buckle and the short circuit, and the assembly is simple and firm, and the stability of the electronic device is effectively ensured.

Claims (8)

The heat sink assembly includes a substrate, at least one extending arm extending along the substrate, and at least one screw fastening device matched with the extending arm, wherein the extending arm is provided with at least one through hole for the screw The fastener device includes a pressing portion and a body extending from the pressing portion, the body is formed with a blocking screw, and the inner wall of the through hole is provided with the resistor a threaded internal thread of the decoupling tooth, the blocking screw of the body is screwed with the internal thread of the through hole and passes through the through hole to be stuck to the lower side of the extension arm, and the lower side of the extension arm is integrated Extending a sleeve communicating with the through hole, and the inner wall of the sleeve is also tapped with an internal thread, and the internal thread of the sleeve matches the retaining screw of the body. The heat sink assembly of claim 1, wherein the resisting screw is formed at an end of the body away from the pressing portion. The heat sink assembly of claim 1, wherein the pressing portion has a diameter larger than a diameter of the body. The heat sink assembly of claim 1, wherein the substrate comprises four extension arms that extend outwardly along the four corners of the substrate, respectively. The heat sink assembly of claim 1, wherein the screw fastener further comprises a joint extending from an end of the body, the joint being for mounting the substrate to a heat source. The heat sink assembly of claim 5, wherein the joint has a diameter less than or equal to a diameter of the body and is provided with an external thread. The heat sink assembly of claim 1, wherein the extension arm is a spring piece. An electronic device using the heat sink assembly according to any one of claims 1 to 7, comprising a circuit board and a heat-generating electronic component fixed to the circuit board, the substrate being attached to the In the heating electronic component, the screw fastener is coupled to the circuit board.