TWI465009B - 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.

At present, in the computer, a heat dissipation module composed of a heat conductor, a heat pipe, a heat sink group and a centrifugal fan is often used to dissipate heat from the electronic components. The heat conductor is attached to the electronic component to absorb the heat of the electronic component, and the heat pipe transfers the heat absorbed by the heat conductor to the heat sink group, and the airflow generated by the centrifugal fan blows the heat sink and exchanges heat with the heat sink to finally dissipate the heat. Therefore, the heat dissipation module plays an extremely important role in ensuring the normal operation of the electronic components.

FIG. 1 shows a conventional heat dissipation module 200. The heat dissipation module 200 includes a centrifugal fan 80 and a heat sink assembly 90. The centrifugal fan 80 includes a frame 82 and a rotor 84 received in the fan frame 82. The fan frame 82 defines an air inlet 820 and an air outlet 822. The heat sink assembly 90 is disposed at the air outlet 822. The rotor 84 is provided. When rotated, the generated airflow is blown toward the fin group 90 located on the side of the air outlet 822. As shown by the arrow in FIG. 1 , the air flow at the air outlet 822 is large on the upper side and small on the lower side, and the flow difference of the air flow is large and a small vortex is easily formed, so that the heat sink located at the middle and the lower side of the air outlet 822 is not obtained. The full utilization limits the heat dissipation performance of the heat dissipation module 200.

In view of this, it is necessary to provide a centrifugal fan that effectively improves the heat dissipation performance and A heat sink having the centrifugal fan.

A centrifugal fan includes a frame and an impeller housed in the fan frame, the fan frame including a top plate of an air inlet and a bottom plate carrying the impeller, and an air outlet formed on one side thereof, the frame is A plurality of flow guiding portions are arranged on the bottom plate near the air outlet, and the plurality of flow guiding portions are arranged in a streamlined manner and arranged from the inside of the fan frame to the air outlet side in the traveling direction of the airflow.

A heat dissipating device includes a centrifugal fan and a heat dissipating fin set, the centrifugal fan includes a frame and an impeller housed in the fan frame, the fan frame includes a top plate of the air inlet and a bottom plate carrying the impeller, and An air outlet is formed on one side of the air outlet, and the heat dissipation fin is disposed at an air outlet of the centrifugal fan. The fan frame is provided with a plurality of flow guiding portions on the bottom plate near the air outlet, and the plurality of flow guiding portions are Streamlined and arranged in the direction of airflow from the inside of the fan frame to the side of the air outlet.

Compared with the prior art, the guiding portion of the centrifugal fan guides the airflow, and changes the airflow distribution on the air outlet side of the centrifugal fan, so that the heat dissipation fin group is fully utilized.

10‧‧‧ Centrifugal fan

100‧‧‧heating device

12‧‧‧Fan frame

120‧‧‧air outlet

121‧‧‧Air inlet

122‧‧‧ top board

124‧‧‧floor

125‧‧‧Drainage Department

126‧‧‧ side wall

127‧‧‧First baffle

128‧‧‧second baffle

13‧‧‧ flow path

14‧‧‧ Impeller

142‧‧·wheels

144‧‧‧ fan leaves

17‧‧‧Strong wind zone

18‧‧‧ weak wind zone

20‧‧‧Fixing fin group

200‧‧‧ Thermal Module

80‧‧‧ centrifugal fan

82‧‧‧Fan frame

820‧‧‧Air inlet

822‧‧‧air outlet

84‧‧‧Rotor

90‧‧‧ Heat sink set

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.

3 is a combination view of the heat sink shown in FIG. 2.

4 is a flow field diagram of the heat sink shown in FIG. 3.

Referring to FIG. 2 and FIG. 3 together, the heat sink 100 includes a centrifugal fan 10 and a heat sink fin set 20 . The centrifugal fan 10 includes a frame 12 and an impeller 14 received in the frame 12 . The impeller 14 includes a hub 142 and a radial direction from the periphery of the hub 142 Extending fan blades 144. The frame 12 includes a top plate 122, a bottom plate 124 opposite the top plate 122, and a scroll sidewall 126 connected between the top plate 122 and the bottom plate 124. The top plate 122, the bottom plate 124 and the side wall 126 are formed to form an accommodating space, and the impeller 14 is received in the accommodating space.

An air inlet 121 is formed in the center of the top plate 122. The impeller 14 is rotatably disposed on the bottom plate 124 and faces the air inlet 121. The side wall 126 is vertically surrounding the outer periphery of the bottom plate 124. In this embodiment, the sidewall 126 is integrally formed with the bottom plate 124. Of course, the side wall 126 can also be formed separately from the bottom plate 124. One end of the side wall 126 defines an air outlet 120. The outer periphery of the impeller 14 is spaced apart from the side wall 126 to form a scroll-shaped flow passage 13 through which the airflow passes. The width of the flow passage 13 is from the air outlet 120. The side gradually increases to the other side.

The air outlet 120 forms a strong wind zone 17 on one side thereof and a weak wind zone 18 in the middle portion. The strong wind zone 17 is located on the wider side of the flow passage 13 of the centrifugal fan. The side wall 126 includes a linear first baffle 127 and a second baffle 128 on the left and right sides of the air outlet 120. The first baffle 127 and the second baffle 128 are spaced apart from each other to form the air outlet 120. The first baffle 127 and the second baffle 128 are parallel to each other. The second baffle 128 is located at one side of the strong wind zone 17 of the air outlet 120. The bottom plate 124 is provided with a plurality of flow guiding portions 125 at the strong wind region 17 of the air outlet 120. The plurality of flow guiding portions 125 are adjacent to the second baffle 128 but spaced apart from the second baffle 128. Each of the flow guiding portions 125 has a rectangular sheet shape and extends vertically upward from the bottom plate 124. The flow guiding portion 125 may be integrally formed with the bottom plate 124, or may be separately molded and fixed to the bottom plate 124 by other fixing means. It can be understood that the flow guiding portion 125 can also extend vertically downward from the top plate 122.

Each of the flow guiding portions 125 includes an inner end adjacent to the inside of the fan frame 12 and an inner end opposite to the inner end The outer end is closer to the air outlet 120 than the inner end. The distance between the inner end of the flow guiding portion 125 and the second baffle 128 is smaller than the distance between the outer end thereof and the second baffle 128, thereby causing each of the flow guiding portions 125 to be inclined at an angle with respect to the second baffle 128. The angle of inclination of the flow guiding portion 125 adjacent to the second baffle 128 with respect to the second baffle 128 is smaller than the angle of the diversion portion 125 away from the second baffle 128 with respect to the second baffle 128. The plurality of flow guiding portions 125 are spaced outwardly from the inside of the flow channel 13 to the air outlet 120. The plurality of flow guiding portions 125 are arranged in a streamlined manner in a plurality of rows, and the columns are spaced apart from each other to form an air flow passage. The number of the flow guiding portions 125 gradually increases from the inside of the fan frame 12 toward the air outlet 120, and the width of the range occupied by the guiding portion 125 on the bottom plate 124 is from the end near the inside of the fan frame 12 toward the air outlet 120. One end gradually increases. The outer end of the outermost flow guiding portion 125 located near one end of the air outlet 120 extends to the center of the air outlet 120. The distance between the flow guiding portion 125 near the impeller 14 and the impeller 14 gradually increases from the inside of the fan frame 12 toward the air outlet 120.

Referring to FIG. 4 together, when the impeller 14 rotates in the clockwise direction in the fan frame 12, the airflow enters the fan frame 121 from the air inlet 121 and flows from the narrower portion to the wider portion in the flow channel 13. Then, it is blown out from the air outlet 120. The airflow first exits the scroll portion of the side wall 126 at the strong wind zone 17 of the air outlet 120, so that the airflow at the strong wind zone 17 of the air outlet 120 is large, and the pressure in the weak wind zone 18 is drastically reduced and becomes small. However, the airflow continues to be blocked by the first baffle 127 on the left side of the air outlet 120, so that the airflow on the left side of the air outlet 120 is slightly increased compared to the weak wind zone 18.

However, a plurality of flow guiding portions 125 are disposed on the bottom plate 124 at the strong wind region 17 of the air outlet 120. The flow guiding portion 125 extends from the inside of the fan frame 12 toward the air outlet 120 in the airflow traveling direction. Therefore, the airflow is in the fan. The inside of the frame 12 is guided by the flow guiding portion 125 to change the direction, and the direction along which the flow guiding portion 125 is arranged is such that one originally blows to the strong wind region 17 of the air outlet 120 Part of the airflow is gradually guided to the weak wind zone 18 of the air outlet 120, increasing the amount of air blown to the weak wind zone 18, thereby making the airflow to the entire air outlet 120 more uniform and suppressing the generation of small vortices. Thereby increasing the utilization of the fins near the location of the weak wind zone 18. Further, since the plurality of flow guiding portions 125 are arranged in a streamlined shape as a whole, the airflow is smoothly blown toward the air outlet 120. The direction in which the flow guiding portions 125 are arranged can be appropriately adjusted according to actual needs to guide the airflow to a desired position.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

100‧‧‧heating device

120‧‧‧air outlet

124‧‧‧floor

125‧‧‧Drainage Department

126‧‧‧ side wall

127‧‧‧First baffle

128‧‧‧second baffle

13‧‧‧ flow path

144‧‧‧ fan leaves

17‧‧‧Strong wind zone

18‧‧‧ weak wind zone

Claims (16)

A centrifugal fan includes a frame and an impeller housed in the fan frame. The fan frame includes a top plate of an air inlet and a bottom plate for carrying the impeller, and an air outlet formed on one side thereof. The improvement is as follows: The fan frame is provided with a plurality of flow guiding portions on the bottom plate near the air outlet, and the plurality of flow guiding portions are arranged in a streamlined manner, and are arranged from the inside of the fan frame to the air outlet side along the traveling direction of the airflow, and the plurality of guiding portions are arranged The width of the range is gradually increased from one end near the inside of the fan frame to the end near the air outlet. The centrifugal fan of claim 1, wherein the fan frame comprises a side wall forming a baffle extending to the air outlet, the flow guiding portion being adjacent to the impeller outside the impeller in the airflow direction Ring distribution. The centrifugal fan according to claim 1, wherein the flow guiding portion has a rectangular sheet shape. The centrifugal fan of claim 1, wherein the air outlet comprises a strong wind zone and a weak wind zone, and the plurality of flow guiding sections are disposed on a strong wind zone side of the air outlet. The centrifugal fan of claim 4, wherein the fan frame comprises a side wall, the side wall comprises a first baffle and a second baffle, and the first baffle and the second baffle are spaced apart from each other. The air outlet is disposed on the side of the strong wind zone of the air outlet, and each of the airflow guiding portions includes an inner end near the inner side of the fan frame and an outer end near the air outlet side, and the inner end of the air guiding portion and the first end The distance between the two baffles is smaller than the distance between the outer end and the second baffle, and the flow guiding portion is inclined at an angle with respect to the second baffle. The centrifugal fan of claim 5, wherein the flow guiding portion adjacent to the second baffle is inclined at an angle smaller than the second baffle from the second baffle; . A centrifugal fan according to claim 4, wherein the outermost end is located near one end of the air outlet. The outer end of the side deflector extends to the center of the air outlet. The centrifugal fan according to claim 1, wherein the plurality of flow guiding portions are arranged in a plurality of rows, each column is streamlined, and the columns are spaced apart from each other to form an air flow passage. A heat dissipating device includes a centrifugal fan and a heat dissipating fin set, the centrifugal fan includes a frame and an impeller housed in the fan frame, the fan frame includes a top plate of the air inlet and a bottom plate carrying the impeller, and An air outlet is formed on one side of the air outlet, and the heat dissipation fin is disposed at an air outlet of the centrifugal fan, and the improvement is that the fan frame is provided with a plurality of flow guiding portions on the bottom plate near the air outlet, the plural The flow guiding portions are arranged in a streamlined manner and are arranged in the airflow direction from the inside of the fan frame to the air outlet side, and the width of the range occupied by the plurality of flow guiding portions gradually increases from an end near the inside of the fan frame toward an end close to the air outlet. The heat dissipating device of claim 9, wherein the fan frame comprises a side wall, the side wall forming a baffle extending to the air outlet, the flow guiding portion is from the baffle to the outside of the impeller in the airflow direction Ring distribution. The heat sink according to claim 9, wherein the flow guiding portion has a rectangular sheet shape. The heat dissipating device of claim 9, wherein the air outlet comprises a strong wind zone and a weak wind zone, and the plurality of flow guiding sections are disposed on a side of the strong wind zone of the air outlet. The heat dissipating device of claim 12, wherein the fan frame comprises a side wall, the side wall comprises a first baffle and a second baffle, and the first baffle and the second baffle are spaced apart from each other. The air outlet is disposed on the side of the strong wind zone of the air outlet, and each of the airflow guiding portions includes an inner end near the inner side of the fan frame and an outer end near the air outlet side, and the inner end of the air guiding portion and the first end The distance between the two baffles is smaller than the distance between the outer end and the second baffle, and the flow guiding portion is inclined at an angle with respect to the second baffle. The heat dissipation device of claim 13, wherein the flow guiding portion adjacent to the second baffle is inclined at an angle smaller than the second baffle from the second baffle; . The heat sink according to claim 12, wherein the outer end of the outermost flow guiding portion located near one end of the air outlet extends to the center of the air outlet. The heat dissipating device of claim 9, wherein the plurality of flow guiding portions are arranged in a plurality of rows, each column is streamlined, and the columns are spaced apart from each other to form an air flow passage.