TWI393526B - Fan base and cooling fan incorporating with the fan base - Google Patents

Description

Fan base and cooling fan using the fan base

The invention relates to a heat dissipation fan, in particular to a base of a heat dissipation fan.

As the output power and operating frequency of electronic components such as central processing units continue to increase, the corresponding amount of heat generated is also significantly increased. As shown in FIG. 1, the heat dissipation module is used in the industry to dissipate heat, that is, on the surface of the heat-generating electronic components. A heat sink 13 is installed for auxiliary heat dissipation, and a heat dissipating fan 10 is installed beside the heat sink 13. The air generated by the heat dissipating fan 10 transmits heat to the external environment more quickly to enhance the heat dissipation effect.

As shown in FIG. 2, the conventional heat dissipation fan 10 includes a fan frame 12, a stator (not shown), and a rotor 14, which includes a hub 141 and a plurality of blades 142. The frame 12 includes a base 121 and is covered by The base 121 is a cover 123. The base 121 is a frame. The base 121 includes a horizontal bottom surface 125 and a side wall 122 formed by the outer edge of the bottom surface 125. The air outlet 126 is opened on one side of the side wall 122 of the base 121. 123. The bottom surface 125 and the side wall 122 of the base 121 together form a receiving portion 124. The air outlet is evenly divided into three parts: the near wind section 126a, the middle wind section 126b and the far wind section 126c. The air volume distribution of the three parts is measured, and the air volume distribution of the three parts is found as follows:

As can be seen from the above table, for the conventional fan structure, there will be a significant high air volume region 126a in the air distribution of the air outlet, and the uneven distribution of the air volume will result in uneven heat dissipation and reduce the overall heat dissipation. The heat dissipation capability of the module. When a large amount of higher speed airflow flows through the radiator, a large amount of noise is generated.

In view of this, it is necessary to provide a fan base capable of optimizing the air volume distribution and a cooling fan using the base.

A fan base includes a bottom plate and side walls protruding from an outer edge of the bottom plate, and one side of the side wall is provided with an air outlet, the air outlet includes a near wind section, a windward section and a far wind section, and the base further comprises The airflow is guided from the near wind section to the wind deflecting block of the windward section and the far wind section, and the air guiding block is located in the near wind section of the air outlet, and the bottom plate protrudes upward to form and is abutted against the side wall.

A cooling fan includes a fan frame, the frame includes a base, and the base includes a bottom plate and sidewalls protruding upward from an outer edge of the bottom plate, and one side of the side wall is provided with an air outlet, and the air outlet includes a near wind segment The wind tunnel section and the wind deflecting section further comprise a wind guiding block for guiding the airflow from the near wind section to the windward section and the far wind section, wherein the air guiding block is located in the near wind section of the air outlet, and the base is The bottom plate is convexly formed upward and abuts against the side wall.

Compared with the prior art, the fan base and the cooling fan have the following advantages: (1) The air guiding block of the air outlet can guide part of the airflow of the near wind section to other parts of the air outlet, optimizing the distribution of the air volume and improving the distribution. Cooling efficiency; (2) Reduce the air volume in the near-wind section, so that the noise generated by the high-speed airflow is reduced.

The structure of the heat dissipation fan will be further described below with reference to the drawings. As shown in FIG. 3, the cooling fan 20 includes a fan frame 22, a stator (not shown), and a rotor 24.

The rotor 24 includes a hub 241 and a plurality of blades 242, and the plurality of blades 242 are radially formed by the outer edge of the hub 241.

The fan frame 22 includes an upper cover 223 and a base 221 . A first air inlet 228 is defined in the center of the upper cover 223 and covers the base 221 . The base 221 is a frame body, and includes a bottom plate 225, a side wall 222 formed by a vertically upwardly protruding outer edge of the bottom plate 225, and a wind guide block 227. A second air inlet 229 is defined in the center of the bottom plate 225, and an air outlet 226 is formed on one side of the side wall 222. The bottom plate 225, the side wall 222 and the upper cover 223 together form a receiving portion 224 in which a stator (not shown) and a rotor 24 are located. The air outlet 226 is formed on one side of the side wall 222, and includes a near wind section 226a, a windward section 226b, and a far wind section 226c having the same width. The air guiding block 227 is a tetrahedron, and includes a wind guiding surface 227a, an air forming surface 227b, a side surface 227c and a bottom surface 227d. The wind guiding portion 226 is located in the near wind portion 226a of the air outlet 226, and is formed by the bottom plate 225 of the base 221 protruding upward. The air outlet 226 gradually increases toward the inner cavity of the base 221. Side 227c is attached to side wall 222. The air outlet surface 227b is an inclined plane formed by obliquely extending from the near wind section 226a toward the inner cavity of the base 221, and its width is gradually reduced to zero, and its height is gradually increased. The air outlet surface 227b intersects the bottom plate 225 of the base 221 at the near air section 226a of the air outlet 226, the angle of which is an acute angle, and the length of the intersection line is 1/3 of the width of the air outlet 226, that is, approximately equal to the near wind section 226a. width. The wind guiding surface 227a has a circular arc surface which is concentric with the hub 241 such that the distance between the air guiding surface 227a and the center of the hub 241 is constant. The height of the highest point of the air guiding block 227 is one half of the height of the side wall 222, and may be other height values as long as the airflow of the near wind portion 226a is not completely blocked. The air guiding block 227 may be integrally formed with the fan frame 22, or may be a separate component and then fixed to the fan frame 22.

When the cooling fan is in operation, the fan blade 242 rotates to generate airflow, and the airflow enters the inner cavity of the base 221 of the fan frame 22 from the first air inlet 228 and the second air inlet 229, and flows to the air outlet 226. The airflow first reaches the near wind section 226a of the air outlet 226. At this time, the airflow encounters the air guiding block 227, and a part of the airflow flows out from the near wind section 226a along the air outlet surface 227b, and the other airflow flows along the air guiding surface 227a to the stroke. Segment 226b and far wind segment 226c, and eventually flow out.

After testing the air volume distribution of the air outlet of the fan base, it is found that the air volume distributions of the near wind segment 226a, the wind segment 226b and the far wind segment 226c are as follows:

Comparing Table 1 and Table 2, it can be seen that the air volume of the air outlet of the present invention is substantially the same as that of the conventional air outlet, and is only reduced by 0.04 cfm. However, from the uniformity of the air volume distribution, the air volume of the near wind section is occupied. The proportion decreased by 3.5%, the proportion of wind volume in the stroke section increased by 2.8%, and the proportion of wind volume in the far wind section increased by 0.7%, optimizing the distribution of air volume.

As shown in FIG. 4, another embodiment of the present invention is different from the previous embodiment in that the wind guiding surface 327a of the air guiding block 327 is a flat surface instead of a curved surface, and the wind guiding surface 327a and the hub are The change of the distance between the centers of 341 can promote more airflow to the far wind section in the near wind section, thereby further increasing the air volume of the far wind section, relatively reducing the air volume of the near wind section, making the air volume distribution more uniform and improving the heat dissipation performance.

Cooling fan. . . 10, 20, 30

Fan frame. . . 12, 22

Base. . . 121, 221

Side wall. . . 122, 222

Cover. . . 123,223

Containment department. . . 124,224

Bottom surface. . . 125

Air outlet. . . 126, 226

Near wind section. . . 126a, 226a

Stroke section. . . 126b, 226b

Far wind section. . . 126c, 226c

heat sink. . . 13

Rotor. . . 14, 24

Wheel hub. . . 141, 241, 341

Fan blade. . . 142,242

Base plate. . . 225

Bottom surface. . . 227d

Wind guiding surface. . . 227a, 327a

Wind guide block. . . 227

side. . . 227c

Out of the wind. . . 227b

The first air inlet. . . 228

Bottom surface. . . 227d

Second air inlet. . . 229

FIG. 1 is an assembled view of a heat dissipation module of the prior art.

2 is a perspective view of the heat dissipation fan of FIG. 1.

Figure 3 is a perspective view of a preferred embodiment of the present invention.

4 is a perspective view of still another preferred embodiment of the present invention.

Fan frame. . . twenty two

Base. . . 221

Side wall. . . 222

Cover. . . 223

Containment department. . . 224

Base plate. . . 225

Air outlet. . . 226

Near wind section. . . 226a

Stroke section. . . 226b

Far wind section. . . 226c

Wind guide block. . . 227

Wind guiding surface. . . 227a

Out of the wind. . . 227b

side. . . 227c

Bottom surface. . . 227d

The first air inlet. . . 228

Second air inlet. . . 229

Rotor. . . twenty four

Wheel hub. . . 241

Fan blade. . . 242

Cooling fan. . . 20

Claims (10)

A fan base includes a bottom plate and side walls protruding from an outer edge of the bottom plate, and one side of the side wall is provided with an air outlet, the air outlet includes a near wind section, a windward section and a far wind section, and the improvement is: The base further includes a wind guide block for guiding the airflow from the near wind section to the windward section and the far wind section, wherein the air guiding block is located in the near wind section of the air outlet, and the bottom plate protrudes upwardly and is attached to the side wall. . The fan base of claim 1, wherein the air guiding block comprises a guiding airflow from the near wind section and a guiding airflow from the near wind section to the middle wind section and the far wind section. Wind guiding surface. The fan base of claim 2, wherein the height of the air outlet surface gradually decreases from the inside to the outside, and the width gradually increases from the inside to the outside. The fan base of claim 2, wherein the air guiding surface is arcuate or planar. The fan base according to claim 3, wherein the height of the highest point of the air guiding block is 1/2 of the height of the side wall of the fan base. A cooling fan includes a fan frame, the frame includes a base, and the base includes a bottom plate and sidewalls protruding upward from an outer edge of the bottom plate, and one side of the side wall is provided with an air outlet, and the air outlet includes a near wind segment The improvement of the stroke section and the windward section is as follows: the base further comprises a wind guide block for guiding the airflow from the near wind section to the windward section and the far wind section, wherein the air guiding block is located in the near wind section of the air outlet. Formed by the bottom plate of the base upwardly and against the side wall. The heat dissipation fan of claim 6, wherein the air guiding block comprises a guiding airflow from the near wind segment and a guiding airflow from the near wind segment to the middle wind segment and the far wind segment. Wind guiding surface. The heat dissipation fan of claim 7, wherein the height of the air outlet surface gradually decreases from the inside to the outside, and the width gradually increases from the inside to the outside. The heat dissipation fan of claim 7, wherein the air guiding surface is curved or linear. The heat dissipation fan of claim 8, wherein the height of the highest point of the air guiding block is 1/2 of the height of the side wall of the base.