TWI427220B - Impeller structure for centrifugal fans - Google Patents

Description

Fan blade structure of centrifugal fan

The present invention relates to a blade structure, and more particularly to a blade structure for a centrifugal fan.

In recent years, with the development of the electronics industry, the performance of electronic components has been continuously improved, the computing speed has become faster and faster, the computing speed of the internal chipset has been continuously increased, the number of wafers has been increasing, and the amount of heat emitted by the wafers has increased accordingly. If the heat is not dissipated in time, the performance of the electronic components will be greatly affected, and the operation speed of the electronic components will be lowered. As the heat is accumulated, the electronic components may be burned, so the electronic components must be dissipated.

In an electronic device with limited installation space such as a notebook computer, a centrifugal fan is usually installed in the vicinity of the electronic component, and the airflow generated by the rotation of the fan blade of the centrifugal fan is directly blown to the electronic component or the heat sink mounted on the electronic component. It is effectively cooled. Conventional centrifugal fans typically include a hub and a plurality of vanes extending linearly outwardly from the hub, and the vanes are angled in the same hour hand direction. Since the size of the airflow generated by the fan depends on the rotating speed of the fan and the swept area of the fan blade, the linear blade has a low air sweeping capability, and the centrifugal fan having the blade structure has a low airflow flow, especially Inside a device such as a notebook computer, the space for mounting the radiator and the centrifugal fan is small, and the blade size is small, further causing gas The flow rate is low, and it is difficult to meet the increasingly high heat dissipation requirements.

Therefore, how to improve the airflow of the centrifugal fan to meet the increasingly high heat dissipation requirements has become an urgent problem for the industry.

In view of this, it is necessary to provide a blade structure of a centrifugal fan having a better wind sweeping capability.

A fan blade structure of a centrifugal fan includes a hub and a plurality of blades formed on an outer circumference of the hub, the blade includes a connecting portion, one end of the connecting portion is coupled to the hub, and the other end of the connecting portion extends outward to form one end At least a portion of the end portion of the end portion in the height direction of the blade is in a first arc shape.

Compared with the prior art, the end portion of the blade in the fan blade structure of the centrifugal fan of the present invention has an arc shape in the blade height direction, which increases the sweeping area of the fan blade, thereby increasing the fan airflow flow and improving Thermal performance.

10‧‧‧Fan leaf structure

20‧‧·wheels

22‧‧‧ round board

24‧‧‧ ring wall

26‧‧‧Combination Department

30, 30a, 30b, 30c‧‧‧ leaves

320, 320a‧‧‧ Connections

340, 340a‧‧‧ end

346‧‧‧ concave

348‧‧ ‧ convex

3201‧‧‧上上

3202‧‧‧下下

3401‧‧‧ upper half of the hot department

3402‧‧‧ lower half

Fig. 1 is a perspective view showing a blade structure of a centrifugal fan according to a first embodiment of the present invention.

Figure 2 is a plan view of Figure 1.

Figure 3 is a cross-sectional view of the end of the blade of Figure 2 taken along the line III-III.

Figure 4 is a cross-sectional view of the connecting portion of the blade of Figure 2 taken along the line IV-IV.

Fig. 5 is a partial perspective view showing a blade structure of a centrifugal fan according to a second embodiment of the present invention.

Figure 6 is a cross-sectional view of the end portion of the blade of Figure 5 taken along the line VII-VII.

The blade structure of the centrifugal fan of the present invention will be described in detail below with reference to the accompanying drawings.

1 shows a preferred embodiment of a blade structure 10 for a centrifugal fan of the present invention. The blade structure 10 of the centrifugal fan of the present invention includes a hub 20 and a plurality of blades 30 extending outwardly from the periphery of the hub 20.

The hub 20 includes a circular plate 22 and an annular wall 24 extending vertically upward from the circumference of the circular plate 22. The central portion of the circular plate 22 is upwardly convex to form a joint portion 26. The cross-sectional area of the joint portion 26 gradually decreases from bottom to top, thereby forming a tapered configuration. The upper surface of the joint portion 26 is recessed downward to form a circular recessed hole (not shown) for the shaft of the fan (not shown) to be rotated, so that the fan blade structure 10 of the centrifugal fan rotates around the rotating shaft to generate an air flow. .

The vanes 30 are radially coupled to the annular wall 24 of the hub 20 and are distributed circumferentially around the hub 20 such that the blade structure 10 of the centrifugal fan does not sway when rotated. The vanes 30 are each disposed obliquely about the hub 20 in a clockwise direction.

All of the blades 30 in the fan blade structure 10 of the centrifugal fan have the same structure and shape, and the following is specifically described for the structure of one blade 30 (please refer to one blade on the outer side in FIG. 1). Referring to FIG. 2, the blade 30 is in the shape of a spoon, and includes a connecting portion 320. One end of the connecting portion 320 is coupled to the hub 20. The other end of the connecting portion 320 extends outward to form an end portion 340. 320 is the handle portion of the spoon, and the end portion 340 is the spoon portion of the spoon. In the present embodiment, between the two adjacent blades 30a, 30b, the free end of the end portion 340 of the latter blade 30a is bent toward the front blade 30b with respect to the connecting portion 320 of the blade 30a. The end 340 of the blade 30 is cut along the height of the blade 30 The surface has a first arc shape, as shown in FIG. 3, the first arc shape may be an arc shape, and the maximum is semicircular. The end portion 340 of the blade 30 has a second arc shape along a direction in which the blade 30 extends. The second arc shape is similar to the first arc shape, and may be an arc shape and a maximum semicircular shape. In the present embodiment, the right side wall (not shown) of the end portion 340 of the blade 30 forms a concave portion 346 having a middle low periphery height, and the left side wall (not labeled) of the end portion 340 forms a convex surface 348, the convex surface 348 is disposed corresponding to the concave surface 346. The concave surface 346 may be a part of a spherical surface, and may be a hemispherical surface. The convex surface 348 may also be a part of a spherical surface, and may be a hemispherical surface. The concave surface 346 and the convex surface 348 may be the same arc surface at the same time, or both The faces of different curvatures, that is, the thicknesses of the ends 340 of the blades 30 may be the same or different, such as a thin intermediate edge or a thin intermediate edge.

In addition, in order to further increase the swept area of the blade 30, in the present embodiment, the cross section of the connecting portion 320 of the blade 30 along the height direction of the blade 30 has a third arc shape. Please refer to FIG. 4, the third arc. The arc of the shape is smaller than the arc of the first arc, and the arrangement of the third arc can further increase the wind flow. Of course, the cross section of the connecting portion 320 of the blade 30 along the height direction of the blade 30 may also be linear, or the connecting portion 320 of the blade 30 may be curved in a cross section along the height direction of the blade 30, and the end portion 340 may be along the blade 30. The cross section in the height direction is linear.

The right side surface of the blade 30 is a sweeping surface, that is, the surface of the blade 30 and the concave surface 346 is the sweeping surface of the blade 30. When working, the fan blade structure 10 of the centrifugal fan will rotate in the counterclockwise direction. The arrangement of the blade 30 structure increases the swept area of the fan blade structure 10 of the centrifugal fan, and the fan flow rate of the blade structure 10 using the centrifugal fan is also increased correspondingly, which can increase the overall efficiency of the centrifugal fan, and is applied to Cooling collar Domains can greatly improve heat dissipation.

Figure 5 is a second embodiment of the blade structure 10a, which differs from the previous embodiment in that the end 340a includes an upper half 3401 and a lower half 3402, the upper half 3401 being curved and the lower half 3402 To be straight, the upper half portion 3401 has an arcuate cross section in the height direction of the blade 30c. As shown in Fig. 6, the lower half portion 3402 has a linear cross section in the height direction of the blade 30c. Of course, in this embodiment, the connecting portion 320a of the blade 30c may also include upper and lower portions 3201, 3202, the upper portion 3201 is a curved surface, and the lower portion 3202 is a straight surface.

In summary, the present invention conforms to the requirements of the invention patent, and proposes 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.

10‧‧‧Fan leaf structure

20‧‧·wheels

22‧‧‧ round board

24‧‧‧ ring wall

26‧‧‧Combination Department

30‧‧‧ leaves

320‧‧‧Connecting Department

340‧‧‧End

346‧‧‧ concave

348‧‧ ‧ convex

Claims (17)

A fan blade structure of a centrifugal fan, comprising a hub and a plurality of blades formed on an outer circumference of the hub, wherein the blade comprises a connecting portion, one end of the connecting portion is coupled to the hub, and the other end of the connecting portion is The outer extension forms an end portion, and at least a portion of the end portion of the end portion in the height direction of the blade has a first arc shape, and at least a portion of the cross section of the connecting portion of the blade in the height direction of the blade has a third arc shape. The fan blade structure of the centrifugal fan according to the first aspect of the invention, wherein the first arc shape is an arc shape. The fan blade structure of the centrifugal fan according to the second aspect of the invention, wherein the first arc shape is at most semicircular. The blade structure of the centrifugal fan according to any one of claims 1 to 3, wherein the end portion has a second arc shape in a section along the extending direction of the blade. The fan blade structure of the centrifugal fan according to the fourth aspect of the invention, wherein the second arc shape is an arc shape. The fan blade structure of the centrifugal fan according to claim 5, wherein the second arc shape is at most semicircular. The fan blade structure of the centrifugal fan according to claim 1, wherein the third arc-shaped arc is smaller than the first arc-shaped arc. The fan blade structure of the centrifugal fan according to claim 1, wherein one side of the end portion is concavely formed with a concave surface, and the surface on which the concave surface is located is a wind sweeping surface of the blade. The blade structure of a centrifugal fan according to claim 1, wherein the free end of the end of one of the adjacent ones of the blades is connected to the blade The part is bent toward the other blade. The blade structure of the centrifugal fan according to the first aspect of the invention, wherein the end portion of the blade includes an upper portion and a lower portion, the upper portion having an arc shape in a section along a height direction of the blade, the lower half Part of the section along the height of the blade is linear. A fan blade structure of a centrifugal fan, comprising a hub and a plurality of blades formed on an outer circumference of the hub, wherein the blade comprises a connecting portion, one end of the connecting portion is coupled to the hub, and the other end of the connecting portion is The outer extension forms an end portion, and at least a part of the cross section of the connecting portion and the end portion in the height direction of the blade is curved. The blade structure of the centrifugal fan according to claim 11, wherein the end portion is curved in an entire cross section in the height direction of the blade. The blade structure of the centrifugal fan according to claim 11, wherein the connecting portion has an arc shape in the entire cross section in the blade height direction. The blade structure of the centrifugal fan according to claim 11, wherein the connecting portion and the end portion are curved in an entire cross section along the height direction of the blade. The fan blade structure of the centrifugal fan according to claim 14, wherein the arcuate curvature of the connecting portion is smaller than the arcuate curvature of the end portion. The blade structure of the centrifugal fan according to any one of claims 11 to 15, wherein the end portion has an arc shape in a section along the extending direction of the blade. A fan blade structure of a centrifugal fan, comprising a hub and a plurality of blades formed on an outer circumference of the hub, wherein the blade comprises a connecting portion, one end of the connecting portion is coupled to the hub, and the other end of the connecting portion is The outer extension forms an end portion, and the end portion has a first arc shape in a section along the height direction of the blade, and the cross section of the connecting portion in the height direction of the blade has a second arc shape, and the arc of the second arc shape is smaller than the curvature of the first arc shape. .