TWI390390B - Airflow reversal prevention assembly and thermal module having the same - Google Patents

Description

Airflow prevention device and heat dissipation module having the same

The invention relates to a gas flow prevention device, in particular to a gas flow prevention device for a heat dissipation module.

With the development of technology, the performance of electronic devices is constantly improving. Whether it is a PC (Personal Computer) for daily use or a server for providing network services, a large number of high-power components are integrated. When the computer is running, these high-power components generate a lot of heat, which causes the temperature of these high-power components to rise continuously, which affects their working performance and stability, and even makes the whole computer paralyzed when it is serious. Therefore, in the design, the high-power components with large heat generation are often equipped with corresponding heat dissipation systems for heat dissipation to achieve the purpose of cooling.

Please refer to FIG. 1A and FIG. 1B , which are schematic diagrams of a conventional heat dissipation system 10 . The heat dissipation system 10 includes a first heat dissipation module 101 and a second heat dissipation module 102 arranged side by side. Each of the heat dissipation modules 101 and 102 is provided with a fan for respectively entering the hot air entering the air outlets 111 from the respective air outlets 111. And the air outlet 112 is discharged.

When the fans of the first heat dissipation module 101 and the second heat dissipation module 102 are normally operated, the hot air inside is exhausted from the air outlet 111 and the air outlet 112, respectively, but when a certain heat dissipation module, such as the second When the heat dissipation module 102 is faulty, and the first heat dissipation module 101 is still in normal operation, although the hot air inside the first heat dissipation module 101 can be discharged from the air outlet 111, the air formed on both sides of the heat dissipation system 10 The pressure difference, part of the hot air discharged from the air outlet 111 passes through the air outlet 112 and enters the second heat dissipation module. 102, thereby causing hot air to recirculate, and the recirculating hot air is collected inside the second heat dissipation module 102, which seriously affects the heat dissipation efficiency of the heat dissipation system 10.

In order to prevent air from flowing back, another heat dissipation system 15 has been invented, and a movable shutter 161 is mounted at the air outlets 153, 154 of the heat dissipation modules 151, 152, respectively, as shown in Figs. 1C and 1D.

However, since the two movable shutters 161 use their own gravity to close the corresponding air outlets 153, 154, when in actual use, the heat dissipation system 15 needs to be rotated by a certain angle, as shown in FIG. 1D rotated counterclockwise by 90 degrees, when placed, Then, the two movable shutters 161 are in a permanent open state under the action of their own gravity. When a certain heat dissipation module fails, the hot air discharged from the corresponding air outlet still enters the interior of the corresponding heat dissipation module from the other air outlet, thereby affecting the heat dissipation efficiency of the heat dissipation system 15.

Therefore, it is necessary to improve the conventional airflow prevention device to eliminate the above-mentioned deficiency.

In view of the above, it is necessary to provide a flow prevention device that can be freely placed without being affected by gravity, and a heat dissipation module having the same.

A flow prevention device for preventing airflow, comprising a passive component, a movable bracket, a fixed bracket, a cylinder fixed to the passive component and the movable bracket and rotatably mounted to the fixed bracket, and a movable bracket and the movable bracket a curtain device between the fixing brackets and an elastic member respectively mounted on the movable bracket and the fixing bracket, the movable bracket being disposed between the passive component and the fixing bracket, when the passive component is driven, With this The elastic member rotates relative to the fixed bracket, and the elastic member is elastically deformed to fold the curtain device. When the passive component is not driven, the elastic member elastically recovers the movable bracket relative to the fixed portion. The bracket is reversed and the curtain device is deployed.

A heat dissipation module includes a casing, the casing includes an air inlet and an air outlet, and one of the air inlet or the air outlet of the casing is provided with an airflow prevention device, and the airflow prevention device includes a a passive assembly, a movable bracket, a fixed bracket, a cylinder fixed to the passive component and the movable bracket and rotatably mounted to the fixed bracket, and a curtain device disposed between the movable bracket and the fixed bracket And an elastic member mounted on the movable bracket and the fixing bracket, the curtain device is configured to block the air inlet or the air outlet, and the movable bracket is disposed between the passive component and the fixing bracket, when the When the passive component is driven, the movable bracket is rotated relative to the fixed bracket by the cylinder, and the elastic member is elastically deformed, so that the curtain device is folded to make the air inlet or the air outlet open, when the When the passive component is not driven, the elastic member elastically recovers to reverse the movable bracket relative to the fixed bracket, and the curtain device is deployed to block the air inlet or the air outlet

Compared with the prior art, the airflow prevention device can not only be rotated by the movable bracket relative to the fixed bracket, but also the curtain device is folded, so that the air in the housing of the heat dissipation module passes through the air inlet or the outlet. The tuyere is discharged, and when the elastic member is elastically restored to expand the curtain device, the curtain device can prevent outside air from flowing into the housing of the heat dissipation module, and the curtain device does not automatically fold due to gravity. The heat dissipation module can be placed at will.

Referring to FIG. 2, a preferred embodiment of the airflow recirculation prevention device 30 of the present invention includes a passive component 310, a movable bracket 320, a fixed bracket 330, a curtain device 340, an elastic member and a cylinder 360. In the present embodiment, the elastic member is a torsion coil spring 350, but the elastic member may also be another component having an equivalent function.

The movable bracket 320 and the fixed bracket 330 are all in a "ten" shape. The movable bracket 320 includes a central portion 322 and four extending arms 324 extending from the periphery of the central portion 322. The central portion 322 defines a fixing hole 326. Each end of the elongated arm 324 is bent by a blocking piece 327. One of the elongated arms 324 defines a locking hole 329. The fixing bracket 330 includes a hub 334 having a through hole 332 and four supporting arms 336 extending from the periphery of the hub 334. The end of each supporting arm 336 is bent against the opposite elongated arm 324 of the movable bracket 320 to form a resistance. A sheet 338, and one of the support arms 336 defines a snap hole 339. In addition, the movable bracket 320 and the fixed bracket 330 may also have a "one" shape or other shapes.

The curtain assembly 340 includes four generally fan-shaped curtains 343, each having a plurality of pleat structures 341 so as to be foldable together. One end of the cylinder 360 is fixed to the passive component 310 , and the other end of the cylinder 360 is fixedly disposed through the fixing hole 326 of the movable bracket 320 . The cylinder 360 can be square, circular, or a suitable component having equivalent functionality. The passive component 310 can be an axial fan, a blower fan, or a suitable component having equivalent functionality.

During assembly, the free end of the cylinder 360 is fixedly inserted into the fixing hole 326 of the movable bracket 320 to fix the movable bracket 320 to the cylinder 360. The spiral portion of the torsion coil spring 350 is sleeved on the cylinder 360, and the free end of the cylinder 360 is inserted into the through hole 332 of the fixing bracket 330, so that the spiral portion of the torsion coil spring 350 is disposed between the movable bracket 320 and the fixing bracket 330. The two ends of the torsion coil spring 350 are respectively engaged into the locking holes 329 and 339 of the movable bracket 320 and the fixing bracket 330, so that the blocking piece of the movable bracket 320 is under the elastic recovery of the torsion coil spring 350. 327 abuts against the resisting piece 338 of the fixing bracket 330 to limit the rotation of the movable bracket 320. One oblique edge of each of the curtains 343 is fixed to one of the movable arms 320 corresponding to the elongated arm 324, and the other oblique side is fixed to one of the supporting arms 336 adjacent to the elongated arm 324, thereby assembling the airflow prevention. Return device 30.

The heat dissipation module 20 includes a housing 22 and a heat sink mounted in the housing 22 . 45. The housing 22 defines an air inlet 50 and an air outlet 40 on opposite sides thereof. The heat sink 45 is a fan mounted to the air inlet 50 of the heat dissipation module 20 .

The airflow recirculation device 30 is fixed to the edge of the air outlet 40 of the casing 22 by the ends of the four support arms 336 of the fixing bracket 330, for example, respectively at the ends of the support arms 336 and the edge of the air outlet 40. The holes are inserted into the locking holes by fixing members to be fixed to the air outlets 40 of the housing 22. At this time, the curtain 343 of the curtain device 340 is shielded from the air outlet 40 of the casing 22, and the passive component 310 of the airflow prevention device 30 is disposed in the movable bracket 320 and the heat sink 45 of the heat dissipation module 20. between.

When the heat sink 45 is operated, for example, in a counterclockwise direction, the airflow generated by the rotation thereof drives the passive component 310 to also rotate in a counterclockwise direction. When the wind driving the passive component 310 is sufficient to cause the torsion spiral When the spring 350 is elastically deformed, the passive component 310 rotates the movable bracket 320 in the counterclockwise direction by the cylinder 360, so that the blocking piece 327 of the movable bracket 320 and the corresponding resisting piece 338 are separated from each other. The curtain 343 of the curtain device 340 is folded up and placed between the extension arm 324 of the movable bracket 320 and the corresponding support arm 336 of the fixed bracket 330, so that the air outlet 40 is in an open state. At the same time, the stop piece 327 of the movable bracket 320 abuts against a resisting piece 338 in the counterclockwise direction, so that the movable bracket 320 stops rotating. The airflow generated by the rotation of the heat sink 45 can be discharged to the heat dissipation module 20 via the air outlet 40.

When the heat sink 45 is stopped, the passive component 310 is in a free state, and the elastic restoring force of the torsion coil spring 350 causes the movable bracket 320 to reverse in the opposite direction, that is, clockwise direction, with respect to the fixed bracket 330. The passive assembly 310 and the cylinder 360 are rotated together, so that the curtain 343 of the curtain device 340 is deployed along with the rotation of the extension arm 324 of the movable bracket 320. When the extension arm 324 is substantially aligned with the original support arm 336 and the stop piece 327 thereon abuts against the adjacent resisting piece 338, the movable bracket 320 stops rotating, so that the curtain device 340 The curtain 343 is again shielded from the air outlet 40 of the casing 22, so that the air outlet 40 is in a closed state.

In actual use, the airflow prevention device 30 can be arbitrarily placed with the heat dissipation module 20, and the airflow prevention device 30 can prevent external airflow from flowing into the heat dissipation module 20 when rotated 90 degrees to the right in FIG. , will not be affected by gravity.

In fact, only one of the support arms 336 of the fixed bracket 330 may be provided with a resisting piece 338, and the movable bracket 320 corresponds to the oppositely extending arm 324. A blocking piece 327 is disposed to abut the resisting piece 338. The movable bracket 320 is rotated in a counterclockwise direction to cause the blocking piece 327 of the extending arm 324 to move away from the resisting piece 338 of the supporting arm 336, the elongated arm 324 and the edge When the support arm 336 is aligned in the counterclockwise direction, the elastic restoring force is formed by the elastic deformation of the torsion coil spring 350, so that the movable bracket 320 stops rotating; or only on one of the support arms 336 of the fixed bracket 330 The resisting piece 338 is disposed. During the rotation of the movable bracket 320, the edges of the two extending arms 324 respectively abut against the two sides of the resisting piece 338, so that the movable bracket 320 stops rotating. In addition, the stopper piece 327 is disposed only at the end of one of the extension arms 324 of the movable bracket 320, and an arc of about 1/4 circumference is formed at the edge of the air outlet 40 of the casing 22 corresponding to the position of the stopper piece 327. The sliding slot, when the movable bracket 320 rotates relative to the fixing bracket 330, restricts the movable bracket 320 from continuing to rotate by the stopping piece 327 sliding in the sliding groove and abutting against the opposite edges thereof. The stop pieces 327 and the resisting piece 338 may also be other stop structures having an equivalent function, such as a pin or the like.

Of course, the movable bracket 320 may not be provided with the stopping pieces 327. The fixing bracket 330 may not be provided with the resisting pieces 338, but the driving force received by the passive component 310 and the torsion coil spring 350 may be elastic. The balance between the spring restoring forces formed by the deformation causes the elongate arms 324 of the movable bracket 320 to stop rotating when aligned with the adjacent support arms 336 of the fixed bracket 330.

In addition, the airflow prevention device 30 can be fixed to the air inlet 50 of the heat dissipation module 20. Accordingly, the heat dissipation device 45 is fixed to the air outlet 40 of the heat dissipation module 20.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations in the spirit of the present invention will be apparent to those skilled in the art. All should be covered by the following patent application.

[study]

10, 15‧‧‧ heat dissipation system

101‧‧‧First Thermal Module

102‧‧‧Second thermal module

111, 112, 153, 154‧‧ vents

151, 152‧‧‧ Thermal Module

161‧‧‧ activity shutter

〔this invention〕

20‧‧‧ Thermal Module

30‧‧‧Preventing airflow reflow device

310‧‧‧ Passive components

320‧‧‧ activity bracket

322‧‧‧ Central Department

324‧‧‧ Extension arm

326‧‧‧Fixed holes

327‧‧‧stop film

329‧‧‧Card hole

330‧‧‧Fixed bracket

332‧‧‧through holes

334‧‧·wheels

336‧‧‧Support arm

338‧‧‧ boycott

339‧‧‧Card hole

340‧‧‧ Curtain installation

341‧‧‧pleate structure

343‧‧‧ Curtain

350‧‧‧Torque coil spring

360‧‧‧Cylinder

40‧‧‧air outlet

50‧‧‧air inlet

45‧‧‧heating device

FIG. 1A is a schematic diagram of a conventional heat dissipation system having two parallelly arranged fans.

Figure 1B is a schematic diagram of a parallel fan failure in Figure 1A.

FIG. 1C is a schematic diagram of a conventional heat dissipation system having a movable shutter and two parallelly arranged fans.

Figure 1D is a schematic view of Figure 1C rotated 90 degrees counterclockwise.

2 is an exploded perspective view of a preferred embodiment of the airflow recirculation preventing device of the present invention.

3 is a schematic view of a preferred embodiment of the present invention for preventing a gas flow reflow device from being mounted on a heat dissipation module without air flow.

Figure 4 is a schematic view of Figure 3 when driven by airflow.

Figure 5 is a schematic view of Figure 3 when rotated 90 degrees inversion.

30‧‧‧Preventing airflow reflow device

310‧‧‧ Passive components

320‧‧‧ activity bracket

322‧‧‧ Central Department

324‧‧‧ Extension arm

326‧‧‧Fixed holes

327‧‧‧stop film

329‧‧‧Card hole

330‧‧‧Fixed bracket

332‧‧‧through holes

334‧‧·wheels

336‧‧‧Support arm

338‧‧‧ boycott

339‧‧‧Card hole

340‧‧‧ Curtain installation

341‧‧‧pleate structure

343‧‧‧ Curtain

350‧‧‧Torque coil spring

360‧‧‧Cylinder

Claims (10)

A flow prevention device for preventing airflow, comprising a passive component, a movable bracket, a fixed bracket, a cylinder fixed to the passive component and the movable bracket and rotatably mounted to the fixed bracket, and a movable bracket and the movable bracket a curtain device between the fixing brackets and an elastic member respectively mounted on the movable bracket and the fixing bracket, the movable bracket being disposed between the passive component and the fixing bracket, when the passive component is driven, The elastic member is elastically deformed by the cylinder to rotate the movable bracket relative to the fixing bracket, so that the curtain device is folded, and when the passive component is not driven, the elastic member is elastically restored to make the movable bracket relatively The curtain device is unfolded while the fixing bracket is reversed. The anti-airflow recirculation device of claim 1, wherein the fixing bracket comprises at least two supporting arms, and the movable bracket comprises at least two elongate arms corresponding to the at least two supporting arms, the curtain device correspondingly comprises At least two curtains, each of which is disposed between the corresponding elongated arm and the support arm. The airflow prevention device of claim 2, wherein each curtain has a plurality of pleat structures. The anti-airflow recirculation device of claim 2, wherein at least one support arm of the fixing bracket is provided with a resisting piece, and the corresponding elongate arm of the movable bracket can block against the resisting piece of the supporting arm. The anti-airflow recirculation device of claim 2, wherein at least one support arm of the fixing bracket is provided with a resisting piece, and the corresponding supporting arm of the movable bracket is provided to abut against the resisting piece of the supporting arm. Stopper. The anti-airflow recirculation device of claim 2, wherein the elastic member is a torsion coil spring, and the helical portion of the torsion coil spring The two ends of the torsion coil spring are respectively disposed on one of the extension arm of the movable bracket and one of the support arms of the fixed bracket. A heat dissipation module includes a casing, the casing includes an air inlet and an air outlet, and the improvement is that: one of the air inlet or the air outlet of the casing is provided with a flow prevention device for preventing airflow. The reflow device includes a passive component, a movable bracket, a fixed bracket, a cylinder fixed to the passive component and the movable bracket and rotatably mounted to the fixed bracket, and a space disposed between the movable bracket and the fixed bracket The curtain device and the two ends are respectively mounted on the movable bracket and the elastic member of the fixing bracket, the curtain device is used for shielding the air inlet or the air outlet, and the movable bracket is placed on the passive component and the fixing bracket When the passive component is driven, the movable bracket is rotated relative to the fixed bracket by the cylinder, and the elastic member is elastically deformed, so that the curtain device is folded to open the air inlet or the air outlet. a state in which the resilient member is elastically restored to reverse the movable bracket relative to the fixed bracket when the passive component is not driven, and the curtain device is deployed to block the air inlet Or outlet. The heat dissipation module of claim 7, wherein the fixing bracket comprises at least two supporting arms, and the movable bracket comprises at least two elongated arms corresponding to the at least two supporting arms, the curtain device corresponding to at least Two curtains, each curtain being disposed between the corresponding elongated arm and the support arm. The heat dissipation module of claim 8, wherein at least one support arm of the movable bracket is provided with a stop piece, and the first air outlet edge of the housing is correspondingly provided with at least one for slidingly receiving the The sliding slot of the at least one stopping piece, when the movable bracket rotates relative to the fixing bracket, the stopping piece slides in the corresponding sliding slot and can abut against the opposite edges of the sliding slot to limit the rotation of the movable bracket. The heat dissipation module of claim 7, wherein the other of the air inlet or the air outlet of the casing is provided with a heat dissipating device, and the airflow generated by the heat dissipating device is used to drive the passive component.