TWM540198U - Centrifugal fan - Google Patents

Description

Centrifugal fan

The present invention relates to a centrifugal fan, and more particularly to a centrifugal fan having an air guiding structure.

With the miniaturization of various electronic devices, such as thinner notebook computers, the system space in notebook computers has been continuously compressed under such industry trends. Therefore, the volume of the cooling fan in the notebook computer must also be reduced correspondingly, and the running resistance of the cooling fan is greatly increased, and the performance of the fan is significantly reduced.

The present invention discloses a centrifugal fan, comprising: a housing including an upper cover and a lower cover; and a fan wheel having a hub disposed in the housing and rotating around the rotating shaft; and a plurality of blades connected to the outer peripheral surface of the hub And at least one air guiding structure connected to the fan blade, and the angle of the air guiding structure relative to the rotating shaft increases with the direction away from the hub.

Please refer to FIG. 1 to FIG. 2 . FIG. 1 is a perspective view showing an embodiment of a centrifugal fan according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing an embodiment of the centrifugal fan according to the present invention. The centrifugal fan illustrated in FIGS. 1 to 2 includes a housing 10 and a fan wheel 20.

The casing 10 is formed by combining an upper cover 10A and a lower cover 10B. The upper cover 10A has a planar structure and is provided with an air inlet 11, the lower cover 10B has a volute groove, and one side of the casing 10 is provided with an air outlet 12. The fan wheel 20 is pivotally disposed in the casing 10 by a hub 21, and the outer peripheral surface of the hub 21 is provided with a fan blade 22, and the fan blade 22 is provided with an air guiding structure 23. When the fan wheel 20 rotates within the casing 10, the airflow enters the casing 10 through the air inlet 11, and the centrifugal force generated by the rotation of the fan wheel 20 causes the airflow to be discharged along the blade 22 through the air outlet 12.

3 and FIG. 4, FIG. 3 is a top view of a combined state of one embodiment of the centrifugal fan of the present invention; and FIG. 4 is a partial schematic view of FIG. In this embodiment, the distance between any point on the air guiding structure 23 and the center O of the fan wheel 20 is a radius value r, which is proportional to the angle θ of the wind guide at the same position. In this embodiment, the angle of the air guiding structure 23 is changed corresponding to the change of the radius value r of the air guiding structure 23, and the air inlet angle of the airflow entering the fan wheel 20 is gradually changed, so that the air inlet angle changes with the tangential speed, according to which The turbulence caused by the airflow around the blade 22 is reduced, and the noise generated by the operation of the blade 22 is reduced, and the performance of the fan wheel 20 is improved.

In the present embodiment, the blade 22 includes a first end 221 and a second end 222. The first end 221 is connected to the outer peripheral surface of the hub 21, and the distance from the first end 221 to the center O of the hub 21 is smaller than that of the second end. The distance from the end 222 to the center O of the hub 21. When the fan wheel 20 rotates, the airflow enters the casing 10 through the air inlet 11 of the upper cover 10A, and is discharged from the outside of the casing 10 through the air outlet 12 via the second end 222.

The fan blade 22 also includes a windward surface 223 and a leeward surface 224. The windward surface 223 and the leeward surface 224 are disposed between the first end 221 and the second end 222. The windward surface 223 of the embodiment is parallel to the leeward surface 224 and has a windward side. The curvature of 223 and any point on the leeward surface 224 is zero. As shown in FIG. 3, when the fan wheel 20 rotates counterclockwise, one side of the blade 22 facing the rotational direction is the windward side 223, and the other side is the leeward side 224.

5 and FIG. 6, FIG. 5 is a side view of the fan wheel 20 of one embodiment of the centrifugal fan of the present invention, and FIG. 6 is a partially enlarged view of an embodiment of the centrifugal fan of the present invention. The blade 22 of the present embodiment includes an upper side 225 and a lower side 226, the upper side 225 is adjacent to the upper cover 10A, and the lower side 226 is adjacent to the lower cover 10B.

The fan blade 22 may be provided with the upper air guiding structure 23A on the upper side 225 or the lower air guiding structure 23B on the lower side 226, or the upper air guiding structure 23A may be disposed on the upper side 225 and the lower air guiding structure 23B may be disposed on the lower side 226. The airflow is guided into the fan wheel 20 by abutting the air inlet 11, so that the airflow can enter the fan wheel 20 more smoothly.

The blade 22 of the embodiment of FIGS. 1 to 6 is provided with an upper air guiding structure 23A on the upper side 225 and a lower air guiding structure 23B on the lower side 226. The air guiding structure 23 may be connected to the windward surface 223 and has an angle with the windward surface 223, and extends away from the windward surface, or is connected to the leeward surface 224 and has an angle with the leeward surface 224, and extends away from the leeward surface. . Each of the blades 22 of the fan wheel 20 of the present embodiment is provided with an upper air guiding structure 23A and a lower air guiding structure 23B, so that the fan wheel 20 reaches a state of balance.

The air guiding structure 23 includes an inner end 231, an outer end 232, a connecting side 233 and a trailing edge 234. The inner end 231 is connected to the outer peripheral surface of the hub 21, and the distance from the inner end 231 to the center O of the hub 21 is smaller than the outer end 232. The distance from the center O of the hub 21, the connecting side 233 and the trailing edge 234 are located between the inner end 231 and the outer end 232, and the inner side 231 and the outer end 232 of the air guiding structure 23 are connected from the fan blade 22 by the connecting side 233. It extends away from the fan blade 22 to the trailing edge 234. The position of any point on the air guiding structure 23 from the inner end 231 to the outer end 232 in the connecting direction is different from the center O of the hub 21, and any point in the connecting direction from the inner end 231 to the outer end 232 The distance from the center O of the hub 21 has a different radius value r.

In an embodiment, the outer end 232 of the air guiding structure 23 is located within the contour of the air inlet 11 so that the airflow can be guided through the air guiding structure 23 when entering the housing 10 through the air inlet 11 due to the end of the air guiding structure 23. The tangential speed of the rim 234 is related to fan performance, so the higher the tangential speed of the trailing edge 234, the faster the wind speed. The tangential velocity is positively correlated with the radius value and the angular velocity, and the angular velocity is related to the angle at which the airflow contacts the trailing edge 234.

In this embodiment, a progressively continuously varying air guiding angle θ is set according to different positions on the trailing edge 234, so that the airflow can be continuously guided continuously. The position of any point on the trailing edge 234 has a radius value r from the center O of the hub 21, and the position of any point on the trailing edge 234 has a wind guide angle θ. The guide air angle θ is an angle between the tangential direction of the end edge 234 at any point position and the axial direction X. The wind guide angle θ of the air guiding structure 23A of the present embodiment is an angle between the tangential direction of the end edge 234A at any point and the axial direction X toward the side of the upper cover 10A; the angle of the wind guiding angle θ of the lower air guiding structure 23B is The edge 234B is at an angle between the tangential direction of the position of any point and the axial direction X toward the side of the lower cover 10B.

The radius value r of any point on the trailing edge 234 of the wind guiding structure 23 is proportional to the angle θ of the wind guide at the same position. As a result, the wind guide angle θ of the trailing edge 234 of the wind guide structure 23 closer to the center O of the hub 21 is smaller, and the smaller the wind guide angle θ away from the center O of the hub 21 is. Moreover, the wind guide angle θ of the trailing edge 234 of the air guiding structure 23 is gradually and continuously changed in a proportional relationship with the radius value r.

When the fan wheel 20 rotates, the airflow enters the fan wheel 20 through the air inlet 11, and the airflow is guided by the air guiding structure 23 to be continuously and gradually guided to the outer end 232 by the inner end 231 of the air guiding structure 23. When the tangential speed is changed, the airflow is introduced at different inlet angles at the same time, thereby improving the fluency of the airflow and reducing the energy loss.

The air guiding structure 23 is not limited by the above-mentioned wind guiding angle θ. The embodiment of the air guiding structure 23 is not limited by the embodiment of FIGS. 1 to 6 . A plane structure in which the curvature is zero at any point between 233A and the trailing edge 234A, and the lower wind guiding structure 23B is also a planar structure in which the curvature is zero at any point between the connecting side 233B and the trailing edge 234B. Further, the lower air guiding structure 23B includes a single plane, and the upper air guiding structure 23A includes a first plane 24 and a second plane 25. The first plane 24 of the upper air guiding structure 23A is coupled to the blade 22, and the second plane 25 is coupled to the first plane 24 with an angle between the first plane 24 and the second plane 25. The trailing edge 234A of the wind guiding structure 23A is the end edge of the second plane 25, and the trailing edge 234B of the lower wind guiding structure 23B is the end edge of the lower wind guiding structure 23B. The end edge referred to in this embodiment refers to the end remote from the blade 22.

Referring to FIGS. 7A-7B, FIGS. 7A-7B show embodiments in which the upper air guiding structure 23A extends from the windward surface 223 in a direction that is at an angle to the windward surface 223. The embodiment of FIG. 7A illustrates that the upper air guiding structure 23A may also include only a single planar structure. The upper air guiding structure 23A of the embodiment of Fig. 7B is a curved surface structure having at least one position where the curvature between the blade 22 and the trailing edge 234A is not zero.

The upper air guiding structure 23A is not limited to extend only from the windward surface 223 toward the windward surface 223. The upper air guiding structure 23A may also be as shown in FIG. 8. FIG. 8 is a fan wheel 20 of the centrifugal fan of the present invention. The fan blade 22 is only provided with the upper air guiding structure 23A, and the upper air guiding structure 23A extends from the leeward surface 224 toward the leeward surface 224. In this embodiment, the wind guiding device connected to the leeward surface 224 The guide wind angle θ of the structure 23 is an angle between the tangential direction of the edge 234 at the same position and the axial direction X toward the side of the lower cover 10B.

As for the lower air guiding structure 23B, FIGS. 9A to 9B are embodiments of the lower air guiding structure 23B. The lower air guiding structure 23B of the embodiment of FIG. 9A has an angle with the leeward surface 224 and extends in a direction away from the leeward surface 224. The lower air guiding structure 23B includes a first plane 24 and a second plane 25. The lower air guiding structure 23B of the embodiment of FIG. 9B has an angle with the leeward surface 224 and extends in a direction away from the leeward surface 224. The lower air guiding structure 23B is a curved structure. Regardless of the embodiment in which the fan blade 22 is separately provided with the upper air guiding structure 23A, the lower air guiding structure 23B is separately provided, or the upper air guiding structure 23A and the lower air guiding structure 23B are provided at the same time, the above embodiments can be provided. Appearance type.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and those skilled in the art can make some modifications and changes without departing from the spirit and scope of the present invention. Therefore, as long as these modifications and variations are within the scope of the appended claims and their equivalents, the present invention will cover such modifications and variations.

10‧‧‧shell
10A‧‧‧Upper cover
10B‧‧‧Undercover
11‧‧‧Air inlet
12‧‧‧air outlet
20‧‧‧fan wheel
21‧‧‧ hub
22‧‧‧ fan leaves
221‧‧‧ first end
222‧‧‧ second end
223‧‧‧ Windward side
224‧‧‧ leeward
225‧‧‧ upper side
226‧‧‧ lower side
23‧‧‧Guide structure
23A‧‧‧Upper wind guiding structure
23B‧‧‧ lower wind guiding structure
231, 231A, 231B‧ ‧ inner end
232, 232A, 232B‧‧‧ outside
233, 233A, 233B‧‧‧ connection side
234, 234A, 234B‧‧‧
24‧‧‧ first plane
25‧‧‧ second plane
R‧‧‧radius value θ‧‧‧wind angle
L‧‧‧ shaft
X‧‧‧ axial
O‧‧ Center

1 is a perspective view of an embodiment of a centrifugal fan of the present invention. 2 is an exploded view of an embodiment of a centrifugal fan of the present invention. Figure 3 is a plan view of one embodiment of a centrifugal fan of the present invention. Figure 4 is a partial schematic view of Figure 3. Figure 5 is a side elevational view of the fan wheel of Figure 2. Figure 6 is a partial schematic view of one embodiment of a centrifugal fan of the present invention. 7A-7B are schematic views of other embodiments of the air guiding structure above the fan blade of the fan wheel of the novel centrifugal fan. Fig. 8 is a schematic view showing another embodiment of the air guiding structure above the blade of the fan wheel of the centrifugal fan of the present invention. 9A-9B are schematic views of other embodiments of the air guiding structure under the blade of the fan wheel of the novel centrifugal fan.

10‧‧‧shell

10A‧‧‧Upper cover

10B‧‧‧Undercover

11‧‧‧Air inlet

12‧‧‧air outlet

20‧‧‧fan wheel

21‧‧‧ hub

22‧‧‧ fan leaves

23‧‧‧Guide structure

23A‧‧‧Upper wind guiding structure

23B‧‧‧ lower wind guiding structure

Claims (10)

A centrifugal fan comprises: a casing comprising an upper cover and a lower cover; a fan having a hub disposed in the casing and rotating about a rotating shaft; a plurality of blades connected to the hub And an outer peripheral surface; and at least one air guiding structure connected to the fan blade, the angle of the air guiding structure relative to the rotating shaft gradually increasing in a direction away from the hub. The centrifugal fan of claim 1, wherein the fan blade comprises a windward surface and a leeward surface, and the air guiding structure is coupled to the windward surface or the leeward surface. The centrifugal fan of claim 2, wherein the blade further comprises an upper side and a lower side, the upper side is adjacent to the upper cover, the lower side is adjacent to the lower cover, and the air guiding structure is coupled to the upper side or the lower side . The centrifugal fan of claim 2, wherein the air guiding structure comprises a connecting side and a last edge opposite to the connecting side, the connecting side is connected to the blade, and the trailing edge is located on the connecting side Keep away from the position of the blade. The centrifugal fan of claim 4, wherein any point on the trailing edge of the air guiding structure has a radius value from a center of the hub, and any point on the trailing edge has an air guide with the radius value The angle, the radius value of the position of the point on the end edge is proportional to the angle of the wind guide. The centrifugal fan of claim 4, wherein the air guiding structure extends away from the windward surface and has an angle with the windward surface. The centrifugal fan according to claim 4, wherein the air guiding structure extends in a direction away from the leeward surface and has an angle with the leeward surface. The centrifugal fan according to claim 4, wherein the curvature of the air guiding structure at any point between the connecting side and the trailing edge is zero. The centrifugal fan of claim 4, wherein the air guiding structure comprises a first plane and a second plane, the first plane is connected to the blade, and the second plane is connected to the first plane, The curvature of any point on the first plane and the second plane is zero. The centrifugal fan of claim 4, wherein the wind guiding structure is a curved structure.