TWI706245B - Heat dissipating device - Google Patents

Abstract

A heat dissipating device including a heat dissipating module, a limiting module, a lifting module, at least one resetting elastic component, and a retaining plate is provided. The heat dissipating module has a fan element, a transmission shaft, and at least one guide bar. The transmission shaft is disposed at a central position of the fan element and extends along an axial direction of the fan element. The guide bar is disposed on a top surface of the fan element. The limiting module is disposed at the at least one guide bar of the heat dissipating module and spaced with the fan element. The lifting module is vertically and movably disposed at the transmission shaft of the heat dissipating module and sleeved around the at least one guide bar to interlock the fan element. The at least one resetting elastic component is correspondingly sleeved around the at least one guide bar and each of the at least one resetting elastic component abuts the limiting module and the lifting module respectively. The retaining plate is connected to the lifting module and spaced with the heat dissipating module.

Description

Heat sink

The present invention relates to a heat dissipation device, and in particular to a heat dissipation device that realizes automatic opening and closing of a heat dissipation hole.

Existing electronic products are usually equipped with heat dissipation devices for reducing the operating temperature of the electronic products. Most of the existing heat dissipating devices use fans to discharge the high-temperature air in the electronic product, so that the low-temperature air in the external environment can enter the electronic product through the heat dissipation hole, and achieve the effect of heat dissipation and cooling through the circulation of high and low temperature air. However, most of the existing electronic products are provided with open meshes on their shells as channels for air circulation. However, the open mesh cannot prevent foreign objects in the environment such as dust and moisture from entering the inside of the electronic product. The accumulation of dust may cause a short circuit of the electronic product, and excessive moisture will make the electronic product damp. In addition, the open mesh will show the internal structure of the electronic product, which affects the aesthetics of the electronic product.

For this reason, how to develop a heat dissipation device that can maintain the connection of the mesh for heat dissipation when the electronic product is in operation. When the electronic product is not in operation, the mesh can be automatically closed to avoid the intrusion of environmental foreign objects such as dust, moisture, etc., and to improve the aesthetics of the electronic product, which is an important current development goal.

The invention provides a heat dissipation device, which is suitable for being installed in a casing of an electronic product. The heat dissipation device can automatically open and close the heat dissipation holes of the casing, improve the appearance of the casing and reduce the accumulation of environmental foreign matter.

The heat dissipation device of the present invention is arranged in a casing, and the casing has a plurality of heat dissipation holes. The heat dissipation device includes a heat dissipation module, a limit module, a lifting module, at least one reset elastic element and a baffle. The heat dissipation module has a fan element, a transmission shaft and at least one guide rod. The transmission shaft is arranged at the center of the fan element and extends along the axial direction of the fan element, and at least one guide rod is arranged on the top surface of the fan element. The limit module is arranged on at least one guide rod of the heat dissipation module and is spaced from the fan element. The lifting module is configured to be lifted and lowered on the transmission shaft of the heat dissipation module and sleeved on at least one guide rod to be linked to the fan element. At least one reset elastic piece is correspondingly sleeved on at least one guide rod, and each reset elastic piece abuts against the limiting module and the lifting module respectively. The baffle is connected to the lifting module and is arranged at intervals outside the heat dissipation module.

When the fan element rotates, the lifting module moves from the initial position toward the limit module and squeezes at least one reset elastic member, and drives the baffle to move until the baffle completely opens the multiple heat dissipation holes of the casing. When the fan element stops When rotating, the lifting module returns to the initial position under the action of at least one reset elastic member, and drives the baffle back, so that the baffle shields the multiple heat dissipation holes of the casing.

Based on the above, the heat dissipation device of the present invention enables the lifting module to lift relative to the transmission shaft and the guide rod as the heat dissipation module rotates or not, so as to drive the baffle to open or cover the multiple heat dissipation holes of the casing. Furthermore, when the fan module of the heat dissipation module rotates, the baffle can be driven to move upward by the lifting module until the heat dissipation hole of the casing is fully opened. When the fan module of the heat dissipation module stops rotating, the lifting module can be pushed by a plurality of reset elastic members to drive the baffle to move downwards to cover the heat dissipation holes of the housing. In this way, when the heat dissipation device of the present invention is not in operation, the baffle can prevent environmental foreign matter from accumulating in the housing through the heat dissipation holes, and can also avoid seeing the components in the housing through the heat dissipation holes to improve the overall appearance.

FIG. 1A is a perspective schematic diagram of a heat sink installed in a casing according to an embodiment of the present invention. FIG. 1B is an exploded schematic view of the components of the heat sink of FIG. 1A. FIG. 1C is a schematic cross-sectional view of the heat sink of FIG. 1A.

1A to 1C, the heat dissipation device 100 is disposed in a casing 200, and the casing 200 has a plurality of heat dissipation holes 210 and a plurality of mounting seats 220. The heat dissipation device 100 is used for discharging the hot air in the casing 200 from the plurality of heat dissipation holes 210 so that the cold air in the environment enters through the plurality of heat dissipation holes 210 to achieve air circulation and heat dissipation effects in the casing 200. For example, the casing 200 is a component accommodating structure used in a computer host, a server, or other electronic devices. The heat dissipation device 100 of this embodiment includes a heat dissipation module 110, a limit module 120, a lifting module 130, at least one reset elastic member 140, and a baffle 150.

The heat dissipation module 110 has a fan element 111, a transmission shaft 112 and at least one guide rod 113.

The fan element 111 is disposed in the casing 200 and adjacent to a plurality of heat dissipation holes 210 on one side of the casing 200. In this embodiment, the fan element 111 is fixed to the corresponding plurality of mounting bases 220 by, for example, a plurality of screws, so as to fix the fan element 111 so as to prevent the fan element 111 from shaking during operation.

The transmission shaft 112 is disposed at the center of the fan element 111 and extends upward along the axial direction AD of the fan element 111. The transmission shaft 112 has two connecting portions CP and a threaded portion SP. The two connecting portions CP are formed on opposite ends of the transmission shaft 112 and have smooth surfaces. The threaded portion SP is formed between the two connecting portions CP. In detail, one of the connecting portions CP of the transmission shaft 112 is connected to the fan element 111, and when the fan element 111 rotates, the transmission shaft 112 will be driven to pivot synchronously.

At least one guide rod 113 is disposed on the top surface TS of the fan element 111, and each guide rod 113 extends upward along the axial direction AD and is parallel to the transmission shaft 112.

The limit module 120 is disposed on at least one guide rod 113 of the heat dissipation module 110, and there is a distance D between the limit module 120 and the fan element 111. In detail, the limit module 120 is fixed on the at least one guide rod 113 by at least one fastener and has a constant distance D between the fan element 111.

The lifting module 130 is vertically configured on the transmission shaft 112 of the heat dissipation module 110 and sleeved on at least one guide rod 113 to be linked to the fan element 111. Among them, the lifting module 130 can be driven by the rotation of the transmission shaft 112 to rise linearly along the axial direction AD, and at least one guide rod 113 is used to limit the inertial rotation and shaking of the lifting module 130 during the ascending process.

At least one reset elastic member 140 is respectively sleeved on the corresponding at least one guide rod 113, and each reset elastic member 140 abuts against the limiting module 120 and the lifting module 130, respectively. Among them, the return elastic member 140 is a compression spring in this embodiment, and the characteristic of the compression spring is that when compressed by an external force, it will elastically deform and accumulate elastic force.

The baffle 150 is connected to the lifting module 130 and is arranged outside the heat dissipation module 110 at intervals. The baffle 150 has a plurality of through holes 151 corresponding to the plurality of heat dissipation holes 210 of the housing 200.

In short, the lifting module 130 lifts and lowers relative to the transmission shaft 112 and the guide rod 113 according to the rotation of the heat dissipation module 110 to drive the through holes 151 of the baffle 150 to align and open the casing 200 The plurality of heat dissipation holes 210 may be displaced and cover the plurality of heat dissipation holes 210 of the casing 200.

2A to 2B are three-dimensional cross-sectional schematic diagrams of the heat dissipation device of FIG. 1A in an open and closed state. 3A to 3B are schematic plan views of the state switching of the lifting module of FIGS. 2A to 2B, respectively.

Referring to FIGS. 2A to 2B, furthermore, the lifting module 130 includes a supporting plate 131, a fixing seat 132 (FIG. 1B ), a lifting nut 133 and at least one pawl 134.

Please refer to FIG. 3A, FIG. 3B, and FIG. 1C together, the support plate 131 is sleeved on at least one guide rod 113 and abuts against at least one reset elastic member 140. The fixing seat 132 is disposed on the supporting plate 131. The lifting nut 133 is rotatably disposed in the fixing base 132, that is, the lifting nut 133 can rotate relative to the fixing base 132. The threaded part SP of the transmission shaft 112 penetrates through the lifting nut 133 and the two are screwed together. At least one pawl 134 (two shown in the figure) is disposed in the fixing base 132 and facing the limiting module 120. Each pawl 134 can swing relative to the fixing base 132 to restrict or release the lifting nut 133.

Referring to FIG. 3B, furthermore, the lifting nut 133 has at least one slot FG (two shown in the drawing). When the lifting module 130 is in the initial position, each pawl 134 is respectively engaged with each corresponding slot FG In FG, the lifting nut 133 and the fixing base 132 are connected as a whole. When the fan element 111 rotates, the lifting nut 133 moves in a spiral shape with the rotation of the transmission rod 112. In addition, the lifting nut 133 is guided by the threaded portion SP to linearly rise in the axial direction AD.

Referring to FIG. 1B, FIG. 2A, and FIG. 3A, the limit module 120 has at least one unlocking column 121 (two are shown in the drawings). Each unlocking column 121 extends toward the fixing base 132. When the baffle 150 moves to fully open the multiple heat dissipation holes 210 of the casing 200, each unlocking column 121 pushes against each pawl 134 to release the lifting nut 133, so that the lifting nut 133 Due to the screwing of the threaded part SP, it can rotate synchronously with the transmission shaft 112, and the baffle 150 stops moving. In short, when each unlocking column 121 separates each pawl 134 from each locking groove FG of the lifting nut 133, the lifting nut 133 is no longer restricted by the pawl 134, and rotates synchronously with the transmission shaft 112.

Furthermore, the transmission shaft 112 has two connecting parts CP and a threaded part SP. The two connecting parts CP of the transmission shaft 112 respectively connect the fan element 111 and the limiting module 120 respectively. One connecting part CP is connected with the fan element 111 and the other connecting part CP is connected with the limiting module 120. The threaded portion SP of the transmission shaft 112 is screwed to the lifting nut 133. When the lifting nut 133 moves spirally relative to the threaded portion SP, the height of the lifting nut 133 relative to the fan element 111 gradually increases. When the lifting nut 133 rotates synchronously with the threaded portion SP, the height of the lifting nut 133 relative to the fan element 111 does not change.

Furthermore, the fixing seat 132 has at least one receiving groove AG and at least one pushing elastic member SR (two are shown in the figure). One end of each resilient member SR is connected to each corresponding slot AG, and the other end of each resilient member SR is connected to each corresponding pawl 134. When each pawl 134 swings relative to the fixing seat 132 to release the lifting nut 133 , Each pawl 134 squeezes each corresponding pushing elastic member SR to enter each corresponding receiving groove AG. Each of the pushing elastic members SR is, for example, a compression spring, so that each of the pushing elastic members SR pushes the pawl 134 away from the receiving groove AG, and the pawl 134 is engaged in the corresponding slot FG to limit the lifting nut 133. Referring to FIGS. 1A and 1B, the supporting plate 131 has two locking portions 135 located on opposite sides of the lifting module 130. The two locking portions 135 are used to lock the baffle 150, and drive the baffle 150 to move linearly along the axial direction AD as the lifting module 130 rises and falls.

1C, 3A and 3B, the limit module 120 has a plurality of blocking posts 122 extending toward the lifting module 130, when the lifting module 130 rises to a certain height, each blocking post 122 will abut against the fixing seat 132.

The state switching process of the heat sink 100 and the casing 200 will be described in detail below.

1A, 1C and 2A, when the fan element 111 of the heat dissipation module 110 rotates in the first direction D1, the fan element 111 drives the transmission shaft 112 to rotate in the first direction D1. At this time, each pawl 134 is engaged with the groove FG of the lifting nut 133 (refer to FIG. 3B). Therefore, the lifting nut 133 spirals up along the threaded portion SP of the transmission shaft 112, and the supporting plate 131 of the lifting module 130 is also Driven by the drive shaft 112, it moves upward from the initial position along the plurality of guide rods 113, and squeezes the plurality of reset elastic members 140 to accumulate elastic force. The baffle 150 rises with the lifting module 130 to open the casing 200 of multiple heat dissipation holes 210. In addition, when the lifting module 130 rises to a certain height (the heat dissipation holes 210 of the casing 200 are fully opened), the fixing base 132 is relatively close to the two unlocking posts 121 of the limit module 120, and each unlocking post 121 pushes against the corresponding Each pawl 134 escapes from the locking slot FG (refer to FIG. 3A), so that each pawl 134 no longer restricts the lifting nut 133, and each pawl 134 presses each pushing elastic member SR to accumulate elastic force. Therefore, the lifting nut 133 is fixed by the screwing of the threaded portion SP, and as the transmission shaft 112 rotates synchronously, the height H of the lifting module 130 relative to the fan element 111 no longer rises.

1A, 1C and 2B, when the fan element 111 of the heat dissipation module 110 stops rotating, the reset elastic members 140 release the accumulated elastic force, so that the support plate 131 of the lift module 130 is subjected to the reset elastic members 140 The elastic pusher moves downward along the plurality of guide rods 113. At the same time, the two unlocking posts 121 of the limit module 120 no longer push against the two pawls 134, and the two pawls 134 return to the initial position by pushing against the elastic member SR, and are engaged with the slot FG again. At this time, the descending support plate 131 will drive the lifting nut 133 to gradually descend along the threaded portion SP of the transmission shaft 112, and at the same time cause the transmission shaft 112 to rotate in a second direction D2 opposite to the first direction D1. Finally, the baffle 150 descends with the lifting module 130 until the reset elastic members 140 return to their original state and shield the heat dissipation holes 210 of the casing 200.

In summary, the heat dissipation device of the embodiment of the present invention allows the lifting module to lift relative to the transmission shaft and the guide rod as the heat dissipation module rotates or not, so as to drive the baffle to open or cover the multiple housings. Vents. Furthermore, when the fan module of the heat dissipation module rotates, the baffle can be driven to move upward by the lifting module until the heat dissipation hole of the casing is fully opened. When the fan module of the heat dissipation module stops rotating, the lifting module can be pushed by a plurality of reset elastic members to drive the baffle to move downwards to cover the heat dissipation holes of the housing. In this way, when the heat dissipation device of the embodiment of the present invention is not in operation, the baffle can prevent environmental foreign matter from accumulating in the housing through the heat dissipation holes, and can also avoid seeing the components in the housing through the heat dissipation holes to improve the overall appearance.

100: heat sink 110: cooling module 111: Fan element 112: drive shaft 113: Guide rod 120: limit module 121: unlock column 122: blocking column 130: Lifting module 131: Support plate 132: Fixed seat 133: Lifting nut 134: Pawl 135: Locking part 140: reset elastic piece 150: baffle 151: Through hole 200: Chassis 210: cooling holes 220: Mounting seat AD: axial AG: container D1: First direction D2: second direction FG: card slot CP: Connection part SP: Threaded part SR: Push against the elastic part TS: Top surface D: Spacing H: height

FIG. 1A is a perspective schematic diagram of a heat sink installed in a casing according to an embodiment of the present invention. FIG. 1B is an exploded schematic view of the components of the heat sink of FIG. 1A. FIG. 1C is a schematic cross-sectional view of the heat sink of FIG. 1A. 2A to 2B are three-dimensional cross-sectional schematic diagrams of the heat dissipation device of FIG. 1A in an open and closed state. 3A to 3B are schematic plan views of the state switching of the lifting module of FIGS. 2A to 2B, respectively.

100: heat sink 110: cooling module 120: limit module 130: Lifting module 140: reset elastic piece 150: baffle 151: Through hole 200: Chassis 210: cooling holes

Claims (8)

A heat dissipation device is arranged in a casing, the casing has a plurality of heat dissipation holes, and the heat dissipation device includes: a heat dissipation module having a fan element, a transmission shaft and at least one guide rod, the transmission shaft is disposed in At the center of the fan element and extending along an axial direction of the fan element, the at least one guide rod is arranged on a top surface of the fan element; a limit module is arranged on the at least one guide rod of the heat dissipation module And spaced apart from the fan element; a lifting module, which is vertically arranged on the transmission shaft of the heat dissipation module and sleeved on the at least one guide rod to be linked to the fan element; at least one reset elastic member, respectively corresponding to The ground is sleeved on the at least one guide rod, and each of the reset elastic members respectively abuts against the limit module and the lifting module; and a baffle connected to the lifting module and arranged at intervals on the heat dissipation module Wherein, when the fan element rotates, the lifting module moves from the initial position toward the limit module and squeezes the at least one reset elastic member, and drives the baffle to move until the baffle completely opens the machine When the fan element stops rotating in the heat dissipation holes of the housing, the lifting module returns to the initial position under the action of the at least one reset elastic member, and drives the baffle back to make the baffle cover the machine The heat dissipation holes of the shell. For the heat dissipation device described in item 1 of the scope of patent application, the lifting module includes: a supporting plate sleeved on the at least one guide rod and abutting against the at least one composite A fixed seat arranged on the support plate; a lifting nut rotatably arranged in the fixed seat, and the transmission shaft and the lifting nut are screwed together; and at least one pawl is arranged on the In the fixed seat, the at least one pawl can swing relative to the fixed seat to limit or release the lifting nut. As described in the second item of the patent application, the lifting nut has at least one slot, and when the lifting module is in the initial position, the at least one pawl is locked in the at least one slot to The lifting nut is moved in a spiral shape with the rotation of the transmission rod. As for the heat dissipation device described in item 2 of the scope of patent application, the limit module has at least one unlocking column extending toward the fixing seat, and when the baffle moves to fully open the heat dissipation holes of the casing, the At least one unlocking column pushes against the at least one pawl to release the lifting nut, so that the lifting nut rotates synchronously with the transmission shaft, and the baffle stops moving. As described in the second item of the patent application, the transmission shaft has two connecting parts and a threaded part, the two connecting parts are respectively connected to the fan element and the limit module, and the threaded part is screwed on The lifting nut. The heat dissipation device according to item 2 of the scope of patent application, wherein the fixing base has at least one receiving groove and at least one pushing elastic member, one end of the at least one pushing elastic member is connected to the corresponding at least one receiving groove, and the other end Connect the corresponding at least one pawl, when the at least one pawl swings relative to the fixing base to release the lift When the nut is lowered, the at least one pawl presses the corresponding at least one pushing elastic member to enter the corresponding at least one receiving groove. According to the heat dissipation device described in the first item of the scope of patent application, the lifting module has two locking parts located on opposite sides of the lifting module for locking the baffle. As described in the first item of the scope of patent application, the heat dissipation device further includes a plurality of blocking columns extending toward the lifting module.

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