TWI418291B - Heat dissipation device and centrifugal fan thereof - Google Patents

Description

Heat sink and centrifugal fan used

The invention relates to a heat dissipating device, in particular to a centrifugal fan.

With the rapid development of the computer industry, the CPU pursues high speed, and the heat dissipation problem caused by high functionality and miniaturization is becoming more and more serious, which is more prominent in electronic devices such as notebook computers with small internal space. If the heat generated by the electronic components such as the CPU in the notebook cannot be dissipated in a timely and effective manner, the performance of the electronic component will be greatly affected, and the service life of the electronic component will be reduced. Therefore, the electronic component must be dissipated.

At present, in the computer, the heat dissipation module is often used to dissipate the heat generated by the electronic components. As shown in FIG. 1 , the conventional heat dissipation module 100 includes a first heat sink group 93 , a second heat sink group 94 , a fan frame 90 , and a rotor 98 . The rotor 98 is received in the fan frame 90 . An air inlet 95, a first air outlet 91 and a second air outlet 92 are formed on the fan frame 90. The first fin group 93 and the second fin group 94 are respectively disposed at the first air outlet 91 and the second air outlet 92. When the rotor 98 rotates, the generated airflow is blown toward the first and second fin groups 93, 94. As shown in FIG. 1, the airflow is large on the right side of the first fin group 93, and the left side is small, and the airflow blown toward the second fin group 94 is also large on the lower side, small on the upper side, and extremely uneven in air volume distribution. The utilization of the heat sink is reduced, and the heat dissipation performance of the heat dissipation module 100 is affected.

In view of this, it is necessary to provide a centrifugal fan that can optimize the air volume ratio and effectively improve the heat dissipation performance, and a heat sink having the same.

A centrifugal fan includes an impeller, a bottom plate and a side wall surrounding the bottom plate, wherein the side wall is provided with an adjacent first air outlet and a second air outlet, and the impeller generates airflow to the first air outlet and the second air outlet, the first A protrusion is arranged between the air outlet and the second air outlet, and the protrusion extends along the outside of the centrifugal fan toward the inside of the centrifugal fan, and the protrusion changes the air flow and air distribution of the first air outlet and the second air outlet. , the air flow is led out from the first air outlet and the second air outlet.

A heat dissipating device includes a centrifugal fan, a first fin set and a second fin set, the centrifugal fan includes an impeller, a bottom plate and a side wall surrounding the bottom plate, wherein the side wall is provided with an adjacent first air outlet and a second air outlet, the first fin group and the second fin group are respectively disposed at the first air outlet and the second air outlet, and the impeller generates airflow to the first air outlet and the second air outlet, the first A protrusion is arranged between the air outlet and the second air outlet, and the protrusion extends along the outside of the centrifugal fan toward the inside of the centrifugal fan, and the protrusion changes the air flow and airflow distribution flowing out of the first air outlet and the second air outlet. The air flow is led out from the first air outlet and the second air outlet.

Compared with the prior art, the bump of the heat sink blocks a portion of the airflow flowing to the second fin group to flow out of the first fin group, increasing the amount of air flowing through the first fin group. The first fin group is more uniformly heated, and the first fin is raised Utilization. In addition, the airflow flowing to the second fin group is guided to the middle portion of the second fin group through the bumps, so that the wind receiving the second fin group is more uniform, thereby improving the utilization ratio of the second fin, thereby improving the The heat dissipation performance of the heat sink.

10‧‧‧ Centrifugal fan

11, 41‧‧‧ bottom plate

12, 42‧‧‧ side wall

13‧‧‧ Impeller

14‧‧‧ top board

15‧‧‧First air inlet

16‧‧‧second air inlet

17, 91‧‧‧ first air outlet

18, 92‧‧‧second air outlet

19, 49‧‧‧Bumps

20‧‧‧First fin set

30‧‧‧second fin set

40, 90‧‧‧ fan frame

44‧‧‧ first side

45‧‧‧ Side edge

46‧‧‧ second side

93‧‧‧First heat sink set

94‧‧‧Second heat sink

95‧‧‧Air inlet

98‧‧‧Rotor

100‧‧‧ Thermal Module

FIG. 1 is a schematic diagram of a flow field of a conventional heat dissipation module.

2 is an exploded perspective view of a preferred embodiment of a heat sink device of the present invention.

FIG. 3 is a schematic diagram of the flow field after the combination of FIG. 2. FIG.

4 is a perspective view of another embodiment of a fan frame.

Referring to FIG. 2 and FIG. 3 together, the heat dissipation device includes a centrifugal fan 10, a first fin set 20 and a second fin set 30. The centrifugal fan 10 includes an impeller 13, a top plate 14, a bottom plate 11, and a scroll side wall 12. The top plate 14 is opposite to the top plate 14, and the side wall 12 is disposed between the top plate 14 and the bottom plate 11. The top plate 14, the bottom plate 11 and the side wall 12 are enclosed to form a frame, and an accommodating space is formed in the fan frame, and the impeller 13 is received in the accommodating space.

The top plate 14 is provided with a first air inlet 15 , and the bottom plate 11 is provided with a second air inlet 16 . The side wall 12 extends vertically upward from the periphery of the bottom plate 11 and surrounds the bottom plate 11 . The side wall 12 is provided with a first air outlet 17 and A second air outlet 18 adjacent to the first air outlet 17 is provided. The first and second air outlets 17, 18 are linear and arranged perpendicular to each other. The first and second fin sets 20 and 30 are respectively formed by stacking a plurality of heat dissipation fins, and the overall shapes of the first and second fin sets 20 and 30 are respectively consistent with the first air outlet 17 and the second air outlet 18 respectively. . The first fin set 20 and the second fin The groups 30 are respectively disposed at the first air outlet 17 and the second air outlet 18.

A protrusion 19 is protruded from the bottom plate 11 between the first and second air outlets 17, 18, and the protrusion 19 extends along the outside of the fan frame of the centrifugal fan 10 toward the inside of the fan frame. The bump 19 is a triangular-shaped sheet-like body. The bottom edge of the bump 19 is horizontally disposed on the bottom plate 11. The height of the bump 19 along the axial direction of the centrifugal fan 10 is greater than zero and not greater than the height of the sidewall 12. The height of the projection 19 gradually decreases from the outside of the centrifugal fan 10 toward the inside of the centrifugal fan 10 to zero. The outermost end of the projection 19 does not exceed the outermost end of the centrifugal fan 10. The distance between the innermost end of the projection 19 and the impeller 13 of the projection 19 is not less than 1 mm, so that the normality of the impeller 13 is not affected. Running. The bumps 19 may be integrally formed with the bottom plate 11, or may be separately formed and disposed on the bottom plate 11.

When the heat sink is in operation, a heat pipe (not shown) rapidly conducts heat generated by the heat generating component to the first and second fin sets 20, 30. When the impeller 13 of the centrifugal fan 10 is in operation, the cold airflow is sucked from the first air inlet 15 and the second air inlet 16, and is blown to the first air outlet 17 and the second air outlet through the first air outlet 17 and the second air outlet 18, respectively. The first fin set 20 and the second fin set 30 at the tuyere 18 thereby blow away the high temperature airflow between the fins. Since the direction of the airflow blown to the right side of the first fin group 20 is substantially the same as the direction of the flow path between the fins, the airflow to the portion is strong. Then, the airflow is blown toward the middle and the left side of the first fin group 20 around the impeller 13, and the change in the airflow angle causes the airflow flowing out of the middle portion and the left side of the first fin group 20 to be weak. However, when the airflow continues to advance, the bump 19 is blocked. Since the height of the bump 19 decreases from the outside to the inside of the centrifugal fan 10, a part of the airflow passes over the bump 19 and continues to blow to the second fin set 30. The other part is blocked and turned to the first fin The left side of the slice group 20.

As shown in FIG. 3, when the bumps 19 are added, the airflow to the first fin group 20 and the second fin group 30 changes, and the air volume flowing through the first fin group 20 remains large except for the right side thereof. In addition, since the bumps 19 block a part of the airflow from flowing out through the left and middle sections of the first fin set 20, the air volume of the left and middle sections of the first fin set 20 is significantly increased and the distribution is relatively uniform. In addition, the airflow to the second fin group 30 is blocked by the bump 19, and the direction of the airflow guided by the bump 19 is changed, so that the strong wind that should flow through the lower side of the second fin group 30 is guided to The middle section of the second fin set 30 increases the wind receiving area of the second fin set 30, thereby also making the air volume distribution more uniform and improving the utilization ratio of the second fin. In addition, the bumps 19 change the air volume ratio flowing through the first fin group 20 and the second fin group 30, and the air volume flowing through the first fin group 20 is increased, correspondingly flowing through the second fins. The air volume of the group 30 is relatively reduced, whereby we can transfer the heat generated by the main heating element or the element with a larger heat amount to the first fin group 20 as needed, using the stronger of the first fin group 20. The heat dissipation capability rapidly dissipates heat, and the secondary or the less heat generating component is thermally connected to the second fin group 30, thereby optimizing the heat dissipation ratio and achieving an optimal heat dissipation effect as needed.

FIG. 4 shows another embodiment of the fan frame. The fan frame 40 is similar to the fan frame in the above embodiment, and includes a bottom plate 41, a side wall 42, and a protrusion 49 disposed on the bottom plate 41. A first air outlet 17 and a second air outlet 18 are formed on the side wall 42. The protrusion 49 is disposed at an intersection of the first air outlet 17 and the second air outlet 18, and the frame 40 is different from the fan frame of the above embodiment. The difference is that the bump 49 is a block-shaped body having a triangular prism shape. The thickness of the bump 49 is inward along the outside of the fan frame 40. Gradually, the thickness of the bump 49 gradually increases from the top to the bottom in the height direction. The bump 49 includes a first side surface 44 facing the first air outlet opening 17 and a second side surface 46 facing the second air outlet opening 18. The first side surface 44 and the second side surface 46 are inclined with respect to the bottom plate 41. The two side surfaces 44, 46 intersect the one side edge 45 in the interior of the fan frame 40, and the side edges 45 are inclined with respect to the bottom plate 41. When the airflow is blown toward the bump 49, it impinges on the first side surface 44. Since the first side surface 44 is inclined with respect to the bottom plate 41, the transition is relatively gentle, and the noise generated by the airflow impinging on the first side surface 44 is relatively reduced, thereby reducing heat dissipation. Noise when the device is in use.

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 it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧ Centrifugal fan

11‧‧‧floor

12‧‧‧ side wall

13‧‧‧ Impeller

14‧‧‧ top board

15‧‧‧First air inlet

16‧‧‧second air inlet

17‧‧‧First air outlet

18‧‧‧second air outlet

19‧‧‧Bumps

20‧‧‧First fin set

30‧‧‧second fin set

Claims (16)

A centrifugal fan includes an impeller, a bottom plate and a side wall surrounding the bottom plate, wherein the side wall is provided with an adjacent first air outlet and a second air outlet, and the impeller generates airflow to the first air outlet and the second air outlet, and the improvement is improved. The protrusion is disposed between the first air outlet and the second air outlet, and the protrusion extends along the outside of the centrifugal fan toward the inside of the centrifugal fan, and the protrusion changes the gas flowing out of the first air outlet and the second air outlet. The flow and the airflow distribution are used to guide the airflow from the first air outlet and the second air outlet, and the height of the bump gradually decreases from the outside of the centrifugal fan to the inside of the centrifugal fan. A centrifugal fan according to claim 1, wherein the height of the projection along the axial direction of the centrifugal fan is greater than zero and not greater than the height of the side wall. The centrifugal fan according to claim 1, wherein the outermost end of the protrusion does not exceed the outermost end of the centrifugal fan, and the distance between the innermost end of the convex fan and the impeller is not less than 1 Millimeter. The centrifugal fan of claim 1, wherein the bump is formed to extend upward from the bottom plate. The centrifugal fan according to claim 1, wherein the first air outlet and the second air outlet are perpendicular to each other. The centrifugal fan according to claim 5, wherein the first air outlet and the second air outlet are linear. The centrifugal fan according to claim 1, wherein the bump is a triangular piece. According to the centrifugal fan of claim 1, wherein the bump has a triangular prism shape, the projection includes a first side facing the first air outlet and a second side facing the second air outlet, the first One side and the second side intersect the inside of the centrifugal fan to a side edge which is inclined with respect to the bottom plate. A heat dissipating device includes a centrifugal fan, a first fin set and a second fin set, the centrifugal fan includes an impeller, a bottom plate and a side wall surrounding the bottom plate, wherein the side wall is provided with an adjacent first air outlet and a second air outlet, the first fin group and the second fin group are respectively disposed at the first air outlet and the second air outlet, and the impeller generates airflow to the first air outlet and the second air outlet, and the improvement is a protrusion is disposed between the first air outlet and the second air outlet, and the protrusion extends along the outside of the centrifugal fan toward the inside of the centrifugal fan, and the protrusion changes the airflow flowing out of the first air outlet and the second air outlet. And the airflow distribution, the airflow is led out from the first air outlet and the second air outlet, and the height of the bump gradually decreases from the outside of the centrifugal fan to the inside of the centrifugal fan. The heat sink according to claim 9, wherein the height of the bump along the axial direction of the centrifugal fan is greater than zero and not greater than the height of the sidewall. The heat dissipating device according to claim 9, wherein the outermost end of the protrusion does not exceed the outermost end of the centrifugal fan, and the distance between the innermost end of the inner portion of the centrifugal fan and the impeller is not less than 1 mm. The heat sink according to claim 9, wherein the bump is formed to extend upward from the bottom plate. The heat dissipating device according to claim 9, wherein the first air outlet and the second air outlet are perpendicular to each other. The heat dissipating device according to claim 13, wherein the first air outlet Both the mouth and the second air outlet are linear. The heat sink according to claim 9, wherein the bump is a triangular piece. The heat sink according to claim 9, wherein the bump has a triangular prism shape, the bump includes a first side facing the first air outlet and a second side facing the second air outlet, the first One side and the second side intersect the inside of the centrifugal fan to a side edge which is inclined with respect to the bottom plate.