TWM564096U - Heat-dissipating fan - Google Patents

Abstract

A heat dissipating fan is provided with a stator set and a fan wheel in a fan casing, and the fan wheel comprises a fan blade assembly formed by a fan and a plurality of the fan blades arranged on an outer circumferential surface of the hub, wherein the fan blade is defined The hub has a hub ratio of 0.395 to 0.515 with respect to the outer diameter of the blade assembly and includes both end points. Therefore, the cooling fan can reduce the volume of the hub and enlarge the area of the blade by adjusting the parameter of the preferred ratio of the hub, thereby improving the air volume generated during the tumbling and improving the cooling fan. performance.

Description

Cooling fan

The present invention relates to a cooling fan, and more particularly to a cooling fan that has both low noise and large air output.

A cooling fan is a device widely used in articles or environments for cooling and cooling. Generally, a cooling fan is provided with a certain sub-group and a wheel in a casing, and the fan has a magnet ring in the hub thereof. The magnet ring is disposed opposite to the coil winding of the stator set and has an air gap, thereby enabling the stator group to control the magnetic polarity change of the coil winding, and the magnet ring of the fan wheel generates mutual magnetic attraction and magnetic repulsion, and drives The fan wheel rotates to enable the cooling fan to provide a cooling airflow.

In the field of cooling fan technology, high air volume, high static pressure and low noise are key projects for fan development, and the parameters such as blade length, sweep angle and blade shape are set to obtain a fan with high efficiency and low noise. For example, in order to reduce the noise of the sound of the fan to the sound quality of the sound, the cooling fan is mainly designed with low noise as the design focus, and the existing cooling fan structure is based on low noise design requirements. Adopting the design of short fan blades, the wheel ratio of the fan wheel is relatively increased, in order to reduce the noise generated when the fan wheel rotates.

However, the cooling fan used in the field of car audio and the like can achieve low-noise heat dissipation performance. However, due to the high hub ratio of the cooling fan, the fan blade area is small, and the air volume is low, resulting in heat sources such as car audio. After a long period of use, the temperature is relatively high, and it is easy to affect the performance of the car audio. Therefore, how to improve the air volume on the basis of low noise, and to solve the problem in the design of the cooling fan in the field of existing car audio.

The purpose of the present invention is to provide a cooling fan that solves the problem of low noise that is limited by existing cooling fans, and it is difficult to provide a problem of large air volume.

In order to achieve the foregoing object, the cooling fan proposed by the present invention comprises: a casing; a certain sub-group disposed in the casing; and a fan wheel rotatably mounted in the casing, The fan wheel includes a wheel body, a wheel axle and a magnet ring. The fan wheel body includes a hub and a plurality of fan blades formed on the outer circumferential surface of the hub. The wheel axle is disposed at the center of the hub and is pivoted. In the fan casing, the magnet ring is disposed in the hub and disposed opposite the stator set to have an air gap, the fan wheel defining a diameter of the hub and a plurality of the fan blades arranged on the outer circumferential surface of the hub The ratio of the outer diameters of a blade assembly is a hub ratio, which is 0.395 to 0.515 and includes both end points.

By the novel structure of the front cooling fan, the ratio of the preferred hub ratio is set to make the diameter of the hub of the fan wheel different from the blade assembly formed by the plurality of blades arranged on the outer peripheral surface of the hub. The ratio of the diameter of the hub is at a better ratio. Compared with the existing cooling fan, which reduces the noise and reduces the fan blade area, the novel cooling fan can pass the better hub ratio parameter on the basis of low noise when rotating. By setting, the volume of the hub can be appropriately reduced and the area of the blade can be enlarged, thereby increasing the amount of wind generated during the tumbling and improving the performance of the cooling fan.

As shown in FIG. 1 to FIG. 5, several preferred embodiments of the novel heat dissipating fan are disclosed. As can be seen from the drawings, the heat dissipating fan comprises a casing 10, 10A and a certain subgroup. 20 and a wheel 30, 30A, 30B.

As shown in FIG. 1 and FIG. 2, the casing 10 includes a casing 11, a bottom plate 12 and a shaft tube portion 13. A movable space 110 is formed in the casing 11, and the casing 11 is formed. A first air outlet 111 and a second air outlet 112 are respectively formed on the opposite sides. The first air outlet 111 and the second air outlet 112 are connected to the movable space 110. The bottom plate 12 is disposed at the bottom of the movable space 110 of the housing 11. The tube portion 13 is located in the movable space 110 and is connected to the bottom plate 12. In the preferred embodiment shown in FIG. 1 , the first tuyere 111 is disposed at the top of the casing 11 , and the second tuyere 112 is disposed in the bottom plate 12 at the bottom of the casing 11 , and the second tuyere 112 is a ring. The plurality of through holes are arranged on the periphery of the shaft tube portion 13.

In addition, as shown in FIG. 3, in the casing 11 of the casing 10A, the first tuyere 111A may be disposed at the top of the casing 11, and the second tuyere 112A is variably disposed on the casing 11 relative to the axle. The radial side of the tube portion 13 (i.e., the side of the peripheral wall of the housing 11). Thereby, any one of the first tuyere 111 and the first tuyere 111 is an air inlet, and the other is an air outlet.

As shown in FIG. 2 and FIG. 4 to FIG. 5, the stator assembly 20 is disposed in the casing 10. In the preferred embodiment, the stator assembly 20 is assembled on the bottom plate 12 of the casing 10. And surrounding the periphery of the shaft tube portion 13. The stator assembly 20 includes a driving circuit board 21 and a stator 22 having a plurality of coil windings 221. The coil windings 221 are electrically connected to the driving circuit board 21, and the driving circuit board 21 can be externally connected to a power source through a wire, thereby controlling the The coil winding 221 produces a magnetic polarity change.

As shown in FIG. 2 and FIG. 4 to FIG. 5, the fan wheels 30, 30A, and 30B are rotatably mounted in the fan casing 10. The fan wheels 30, 30A, and 30B include a wheel body 31, 31A, 31B, a wheel axle 32 and a magnet ring 33. The fan wheel body 31, 31A, 31B includes a hollow hub 311, 311A, 311B and a plurality of fans formed on the outer circumferential surface of the hubs 311, 311A, 311B. The wheel 312 is disposed at the center of the hub 311, 311A, and 311B and is pivotally disposed in the casing 10. The magnet ring 33 is a ring body made of a permanent magnet. The magnet ring 33 is fixed to the hub 311. 311A and 311B are disposed opposite to the stator 22 of the stator assembly 20 and have an air gap therebetween, so that the stator assembly 20 can rotate the fan wheel 30 by magnetic force.

In the preferred embodiment shown in FIG. 2 and FIG. 4 to FIG. 5, the fan wheel 30, 30A, 30B is disposed in the movable space 110 of the housing 11, and the axle 32 is pivoted on the shaft. In the tube portion 13, a bearing 14 may be further disposed between the axle 32 and the shaft tube portion 13. Alternatively, a wear pad 15 may be added to the bottom portion of the shaft tube portion 13, the fan wheel 30, 30A, 30B. The bottom end of the axle 32 forms an arcuate end portion 321 and contacts the wear pad 15 with the arcuate end portion 321 with a small contact area, so that the fan wheel 30, 30A, 30B is supported by the fan casing 10. And reduce the frictional resistance and noise when the fan wheel 30 rotates. A hub 313 having a downward opening is formed in the hubs 311, 311A, and 311B of the fan wheel bodies 31, 31A, and 31B. The magnet ring 33 is fixed to the peripheral wall of the chamber 313 and has a diameter of the stator 22 of the stator assembly 20. To the opposite.

In the preferred embodiment shown in FIGS. 1 and 2, the hub 311 of the fan wheel 30 includes a hollow cylindrical base 314 and a hub end 315 formed at an upper end of the base 314. The hub end 315 has a conical surface with a decreasing bottom-down dimension, and a top plane at the top end of the conical surface; or, in the preferred embodiment shown in FIG. 4, the hub 311A of the fan wheel 30A includes a hollow cylinder a base portion 314A and a hub end 315A formed at an upper end of the base portion 314A, the hub end portion 315A forming a spherical curved surface; or, as shown in the preferred embodiment of FIG. 5, the hub 311B of the fan wheel 30B includes A hollow cylindrical base portion 314B and a hub end portion 315B formed at an upper end of the base portion 314B, the hub end portion 315B forming a cone having a downwardly decreasing size and having a tip end.

In the foregoing fan wheel 30, 30A, 30B, the fan wheel 30 shown in FIG. 2 is taken as an example. As shown in FIG. 6, the fan wheel 30 defines a diameter d of the hub 311 and a plurality of rings arranged on the outer circumferential surface of the hub 311. The ratio of the outer diameter D of the blade 312 forming a blade assembly A is a hub ratio, and the hub ratio is 0.395 to 0.515 and includes the values of the two ends. The preferred hub ratio is 0.430 to 0.480 and includes Two endpoint values.

As shown in FIG. 7 and FIG. 8, the axle 32 of the fan wheel 30, 30C has a central axis C, and the heat dissipation fan defines a reference plane P passing through the center of the bottom surface of the casing 10 and perpendicular to the central axis C. One of the blades 312, 312C includes one of the inner edges 3121, 3121C of the outer peripheral surface of the hubs 311, 311C and a blade outer edge 3122, 3122C with respect to the other side of the inner edges 3121, 3121C of the blade. The distance L1 of the top edge of the inner edge 3121, 3121C of the blade relative to the reference plane P is equal to or smaller than the distance L2 of the top edge of the outer edge 3122 of the blade relative to the reference plane P, that is, the blade 312, The top edge of the inner edge of the blade 312, 3121C of the 312 and the top edge of the outer edge of the blade 3122, 3122C are of the same height or a low-high type.

As shown in FIG. 2 to FIG. 4, when the heat dissipation fan is in use, the drive circuit board 21 controls the coil winding 221 of the stator assembly 20 to generate a magnetic polarity change, and the magnet ring 33 of the fan wheel 30 generates mutual magnetic attraction and magnetic force. The magnetic force is applied to drive the fan wheel 30 to rotate, so that the cooling fan can provide a heat dissipation airflow.

It can be seen from the above description that the present invention uses the ratio of the preferred hub ratio of the fan wheel to set the diameter of the hub of the fan wheel to the outer edge of the blade assembly formed by a plurality of blades arranged on the outer peripheral surface of the hub. The ratio of the diameters reaches a desirable ratio. Compared with the structure of the existing cooling fan to reduce the fan area and reduce the noise, the new cooling fan can be based on the better ratio of the hub ratio based on the low noise when rotating. By setting, the volume of the hub is appropriately reduced and the area of the fan blade is enlarged, thereby increasing the amount of air generated when the turbulence is rotated, and improving the performance of the cooling fan.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the present invention, and any technology that is familiar with the present technology. Persons, without departing from the spirit of the novel technology, may make some modifications or modifications to equivalent embodiments by using the prior art, but the content of the present invention is not deviated from the present invention. Technical Substantially Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the present invention.

10‧‧‧Fan shell
11‧‧‧Shell
110‧‧‧Event space
111‧‧‧First air outlet
112‧‧‧second air outlet
12‧‧‧floor
13‧‧‧ shaft tube department
14‧‧‧ bearing
15‧‧‧Abrasion resistant gasket
20‧‧‧stator group
21‧‧‧Drive circuit board
22‧‧‧ Stator
221‧‧‧ coil winding
30, 30A, 30B, 30C‧‧‧fan wheel
31, 31A, 31B‧‧‧fan wheel body
311, 311A, 311B, 311C‧‧ wheels
312, 312C‧‧‧ fan blades
3121, 3121C‧‧‧Inside of the fan blade
3122, 3122C‧‧‧ outside the fan blade
313‧‧‧室
314‧‧‧ base
315‧‧·The end of the hub
32‧‧‧Axle
321‧‧‧Arc end
33‧‧‧ magnet ring
A‧‧‧ fan blade assembly
C‧‧‧ center axis
P‧‧‧ reference plane
D‧‧· diameter of the hub
The outer diameter of the D‧‧‧ fan blade assembly
L1‧‧‧The distance from the top edge of the inner edge of the fan blade to the reference plane
L2‧‧‧ Distance from the top edge of the outer edge of the fan blade to the reference plane

1 is a perspective view of a first preferred embodiment of the novel heat dissipation fan. 2 is a side cross-sectional view showing the first preferred embodiment of the heat dissipation fan shown in FIG. 1. 3 is a side cross-sectional view showing a second preferred embodiment of the novel heat dissipating fan. 4 is a side cross-sectional view showing a third preferred embodiment of the novel heat dissipating fan. Figure 5 is a side cross-sectional view showing a fourth preferred embodiment of the novel heat dissipating fan. 6 is a side cross-sectional view of the fan wheel in the preferred embodiment of the heat dissipating fan shown in FIG. 1 to FIG. 2 or FIG. Figure 7 is a side cross-sectional view showing the preferred embodiment of the heat dissipating fan shown in Figures 1 and 2. Figure 8 is a side cross-sectional view showing another preferred embodiment of the novel heat dissipating fan.

Claims (9)

A cooling fan includes: a casing; a certain sub-group disposed in the casing; and a fan wheel rotatably mounted in the casing, the fan wheel including a wheel body and a An axle and a magnet ring, the fan wheel body includes a hub and a plurality of annular blades formed on the outer circumferential surface of the hub, the axle is disposed at a center of the hub and is pivoted in the casing, the magnet ring Is disposed in the hub and disposed opposite the stator set to have an air gap, the fan wheel defining a diameter of the hub and a plurality of the fan blades arranged on the outer circumferential surface of the hub to form a blade outer periphery The diameter ratio is a hub ratio, which is 0.395 to 0.515 and includes both end points. The heat dissipation fan of claim 1, wherein the hub comprises a hollow cylindrical base and a hub end formed at an upper end of the base, the hub end forming a spherical curved surface. A heat dissipation fan according to claim 1, wherein the hub includes a hollow cylindrical base and a hub end formed at an upper end of the base, the hub end forming a cone having a downwardly decreasing shape and a tip end body. The heat dissipation fan of claim 1, wherein the hub comprises a hollow cylindrical base and a hub end formed at an upper end of the base, the hub end having a conical surface that is reduced in size from bottom to top. And a top plane at the top of the conical surface. The heat dissipation fan according to any one of claims 1 to 4, wherein the hub ratio is 0.430 to 0.480 and includes both end point values. The heat dissipation fan according to any one of claims 1 to 4, wherein the wheel axle of the fan wheel has a central axis, and the heat dissipation fan defines a reference plane passing through a center of the bottom surface of the fan shell and perpendicular to the central axis. Each of the blades includes an inner edge of one of the blades connecting the outer peripheral surface of the hub and an outer edge of the blade opposite to the other side of the inner side of the blade, and a top edge of the inner edge of the blade is opposite to the reference plane The distance is equal to or less than the distance of the top edge of the outer edge of the blade relative to the reference plane. The heat dissipation fan of claim 6, wherein the fan casing comprises a casing, a bottom plate and a shaft tube portion, wherein the casing forms an active space, and the opposite sides of the casing respectively form a first air outlet And a second tuyere, the first tuyere and the second tuyere communicate with the movable space, the bottom plate is disposed at a bottom of the movable space of the casing, the shaft tube portion is located in the movable space and is connected to the bottom plate; The lining is disposed on the bottom plate and surrounds the periphery of the shaft tube portion; the fan wheel is disposed in the movable space of the housing, and is pivotally disposed in the shaft tube portion of the wheel hub body A chamber having an opening facing downward is formed, and a magnet ring is disposed on a peripheral wall of the chamber and radially opposite to the stator group. The heat dissipation fan of claim 7, wherein the first tuyere and the second tuyere are respectively located at a top and a bottom of the housing. The heat dissipation fan of claim 7, wherein the first tuyere is located at a top of the housing, and the second tuyere is located at a radial side of the housing relative to the shaft tube portion.