TWI548815B - Fan - Google Patents

Description

fan

The invention relates to a fan for dissipating heat from an electronic component.

With the rapid development of electronic technology, the heat-generating electronic components such as the central processing unit are running faster and faster, and the heat generated during operation is correspondingly increased. In order to dissipate the heat to ensure the normal operation of the electronic components, the industry adopts a fan pair. The electronic components dissipate heat.

A conventional fan generally includes a fan frame and an impeller housed in the fan frame. The impeller includes a centrally located hub and a plurality of blades extending from the hub. When the fan is working, the airflow distribution of the air outlet is not uniform. When the airflow passes through the edge of the opening of the fan frame, the airflow of the air outlet rapidly spreads out due to the torque, resulting in a more concentrated airflow distribution near the fan. The closer to the center of the fan, the less the airflow is distributed. The fan's hub is near the hub because there is no fan blade or even a windless zone. The fan's heat dissipation efficiency is low.

In view of this, it is necessary to provide a fan with higher heat dissipation efficiency.

A fan includes an air guiding hood and an impeller. The axial ends of the air guiding hood respectively form an air inlet and an air outlet. The air hood generates an axis that is discharged from the air inlet to the air outlet when the impeller is running. To the air flow, the air hood includes an outer frame whose diameter gradually decreases from the side close to the impeller to the air outlet side along the axial direction of the fan.

A part of the airflow generated by the fan changes direction under the guidance of the air hood and flows out along the axial direction of the fan, thereby improving the heat dissipation efficiency of the fan.

100‧‧‧fan

10‧‧‧ support

20‧‧‧wind hood

30‧‧‧ Impeller

22‧‧‧Ontology

24‧‧‧ cover

220‧‧‧Front frame

222‧‧‧ Pedestal

224‧‧‧ 静叶

226‧‧‧air outlet

240‧‧‧Connecting Department

242‧‧‧Back cover

246‧‧‧ pivot column

244‧‧‧ stomata

12‧‧‧ tablet

14‧‧‧ riser

140‧‧‧Pivot hole

32‧‧·wheels

34‧‧‧ fan leaves

36‧‧‧ shaft

1 is an assembled view of an embodiment of a fan of the present invention.

Figure 2 is an exploded view of the fan of Figure 1.

Figure 3 is a cross-sectional view of the fan of Figure 1 taken along line IV-IV.

4 is a schematic view of the back of the fan of FIG. 1.

Referring to FIG. 1 , a fan 100 according to an embodiment of the present invention includes a support base 10 , an air hood 20 connected to the support base 10 , and an impeller 30 housed in the air hood 20 .

Referring to FIG. 2 and FIG. 3 simultaneously, the air hood 20 includes a body 22 and a cover 24 connected to the body 22. The body 22 includes an outer frame 220, a columnar base 222 located at the center of the outer frame 220, and a plurality of spiral vanes 224 extending from the periphery of the base 222 and connected to the outer frame 220. The opening on the outer side of the outer frame 220 constitutes the air outlet 226 of the air hood 20. The length of the outer frame 220 extending along the central axis AA' of the fan 100 is equal to the length of the base 222 extending along the central axis AA'.

The inner diameter and the outer diameter of the outer frame 220 gradually decrease from a side close to the impeller 30 toward a side away from the impeller 30 (ie, a side close to the air outlet 226) along a direction of the central axis AA' of the fan 100. Forming a structure that is tapered from the inside to the outside, so that the airflow near the outer frame 220 generated by the fan 100 is changed from a direction substantially parallel to the central axis AA' toward the central axis of the fan 100 under the guidance of the inner wall of the outer frame 220. The direction of AA' flows out, that is, the flow direction after the airflow under the action of the inner wall of the outer frame 220 is changed. An angle is formed with the central axis AA'.

In the present embodiment, the base 222 is divided into two parts along the direction of the central axis AA', and the diameter of the portion of the base 222 near the air outlet 226 is along the direction of the central axis AA', from closer to the impeller 30. One side gradually decreases toward the air outlet 226 side, so that a part of the airflow flowing along the surface of the base 222 is redirected under the guidance of the base 222 to flow out toward the central axis AA' of the fan 100. The diameter of the portion of the base 222 near the impeller 30 is gradually increased from the side close to the impeller 30 toward the side away from the impeller 30 in the direction of the central axis AA' to facilitate the airflow along the surface of the base 222 toward the air outlet. 226 side flow.

Preferably, the diameter of the portion of the base 222 near the air outlet 226 gradually decreases from the side closer to the impeller 30 toward the side of the air outlet 226. Of course, the tendency of the diameter of the portion of the base 222 near the impeller 30 to change from the side close to the impeller 30 to the side away from the impeller 30 may also be gradually reduced or left unchanged.

Referring to FIG. 4 at the same time, the cover body 24 includes a cylindrical connecting portion 240 and a rear cover 242 opposite to the impeller 30. The impeller 30 is housed in the air hood 20 at a position corresponding to the connecting portion 240. The diameter of the connecting portion 240 is constant along the direction of the central axis AA' from the side close to the rear cover 242 toward the side away from the rear cover 242. The outer surface of the connecting portion 240 protrudes outwardly from the two sides to protrude from the two pivot posts 246. The inner and outer surfaces of the rear cover 242 are substantially hemispherical. The rear cover 242 defines a plurality of air holes 244 arranged in a concentric circle to form an air inlet of the air guiding cover 20.

The support base 10 includes a rectangular flat plate 12 and two risers 14 extending vertically upward from opposite end edges of the flat plate 12. Each of the risers 14 defines a circular pivot hole 140. The two pivoting posts 246 of the air guiding cover 20 are received in the pivoting holes 140 of the supporting base 10, so that the air guiding cover 20 is pivotally engaged with the supporting base 10 and can be rotated relative to the supporting base 10.

The impeller 30 includes a hub 32, a plurality of blades 34 extending from the periphery of the hub 32, and a shaft 36 secured to the center of the hub 32. The shaft 36 is rotatably fixed to the center of the base 222 of the air hood 20.

When the fan 100 is in operation, the impeller 30 rotates at a high speed, and the airflow 244 of the air hood 20 draws airflow from the outside, and the airflow flows in the air hood 20. Since the outer frame 220 is tapered from the inner side outward in the direction of the central axis AA' of the fan 100, the air flow flowing along the inner wall of the outer frame 220 is guided by the inner wall of the outer frame 220, and the direction is changed toward the central axis AA of the fan 100. 'The direction flows out. A portion of the airflow flowing along the vane 224 of the air duct 20 flows out in the direction of the central axis AA' under the guidance of the vane 224. A part of the airflow flowing out of the fan 100 is concentrated near the central axis AA' outside the air outlet 226 of the fan 100, and the airflow is more evenly distributed from the periphery to the center of the fan 100, thereby improving the heat dissipation efficiency of the fan 100.

Since the diameter of the portion of the base 222 near the air outlet 226 gradually decreases from the side closer to the impeller 30 toward the air outlet 226 side, a part of the airflow flowing along the surface of the base 222 is guided by the base 222, and the direction is changed. The direction of the center axis AA' of the fan 100 flows out. In this way, part of the airflow flowing out of the fan 100 can be further concentrated near the center axis AA' outside the air outlet 226 of the fan 100 to further improve the uniformity of the airflow and the heat dissipation efficiency of the fan 100.

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‧‧‧fan

10‧‧‧ support

20‧‧‧wind hood

30‧‧‧ Impeller

Claims (7)

A fan includes an air guiding hood and an impeller. The axial ends of the air guiding hood respectively form an air inlet and an air outlet. The air hood generates an axis that is discharged from the air inlet to the air outlet when the impeller is running. To the air flow, the air hood includes an outer frame, and the improvement is that the diameter of the outer frame gradually decreases from the side close to the impeller to the air outlet side along the axial direction of the fan, and the air hood further includes A base in the center of the frame, the diameter of the base gradually increases from the side close to the impeller to the side of the air outlet along the axial direction of the fan, and then gradually decreases. The fan of claim 1, wherein the air hood further comprises a plurality of vanes extending from a periphery of the base and connected to the outer frame, the impeller being rotationally fixed on the base, adjacent to the air outlet The diameter of a portion of the base gradually decreases from the side closer to the impeller to the side of the air outlet along the axial direction of the fan. The fan of claim 1, wherein the air hood further comprises a cover connected to the body, the impeller being received in the air hood. The fan of claim 3, wherein the cover body comprises a cylindrical connecting portion and a rear cover opposite to the impeller, the impeller being disposed in a position corresponding to the connecting portion in the air guiding cover, The rear cover defines a plurality of air holes arranged in a concentric circle to form an air inlet of the air guiding cover. The fan of claim 4, wherein the inner and outer surfaces of the back cover are hemispherical. The fan of claim 4, wherein the diameter of the connecting portion is along the axial direction of the fan, and remains unchanged from a side close to the back cover to a side away from the back cover. The fan of claim 1, further comprising a support seat pivotally connected to the air hood.