TWI544155B - Cooling fan - Google Patents

Description

Cooling fan

The present invention relates to a fan, and more particularly to a heat dissipation fan.

A conventional cooling fan includes a frame and a stator and a rotor housed in the fan frame. The stator includes a base fixed to the fan frame and a core sleeved on the base. The rotor includes a cylindrical hub, a rotating shaft fixed at one end in the hub, and a magnetic group received in the hub. The other end of the rotating shaft is threaded and fixed to the base to support the hub. The rotor can be fixed relative to the stator under the action of the magnetic force of the core and the magnetic group. However, the magnetic attraction between the stator and the rotor shifts the center of the magnetic force between the stator and the rotor, thereby causing axial vibrations to generate noise due to changes in the axial force when the fan rotates.

In view of this, it is necessary to provide a rotor of a fan with good stability and low noise.

A cooling fan includes a fan frame, a stator and a rotor housed in the fan frame, the fan frame having opposite air inlets and air outlets, the rotor being rotatable relative to the stator, the rotor including the hub and the self-hub outward An extended fan blade is formed with an inclined flange at one end of the fan blade. The air entering the heat dissipation fan from the air inlet port presses the flange and the fan blade toward the air outlet port, and then flows out of the heat dissipation fan from the air outlet port.

Compared with the prior art, in the present invention, since the blade is provided with a slanted hem, the pressure receiving area of the rotor is increased, so that when the air enters the heat-dissipating fan, the downward pressure on the rotor is strengthened, thereby achieving the reinforced rotor. Axial downforce, reducing axial vibration , reducing the generation of noise.

10‧‧‧Fan frame

12‧‧‧ hollow frame

14‧‧‧ pedestal

15‧‧‧中柱

17‧‧‧Air inlet

18‧‧‧air outlet

20‧‧‧ Stator

22‧‧‧ Stator core

24‧‧‧ coil

26‧‧‧ Circuit board

27‧‧‧Installation holes

28‧‧‧Insulation frame

30‧‧‧Rotor

32‧‧·wheels

34‧‧‧ shaft

36‧‧‧Magnetic Group

38‧‧‧ fan leaves

80‧‧‧ bearing

100‧‧‧ cooling fan

150‧‧‧Perforation

322‧‧‧ top wall

323‧‧‧ shaft seat

324‧‧‧ side wall

342‧‧‧Free end

381‧‧‧Connected section

383‧‧‧Extension

385‧‧‧Folding

1 is a cross-sectional view of a fan in accordance with an embodiment of the present invention.

Figure 2 is a perspective view of the rotor of the fan shown in Figure 1.

Referring to FIG. 1 , the cooling fan 100 includes a frame 10 and a stator 20 and a rotor 30 received in the frame 10 .

Referring to FIG. 2 at the same time, the rotor 30 includes a hub 32, a rotating shaft 34, a magnetic group 36 and a plurality of blades 38. The hub 32 includes a circular top wall 322 and a cylindrical side wall 324 extending vertically downward from the periphery of the top wall 322. The center of the lower surface of the top wall 322 extends downward to form a shaft seat 323. The rotating shaft 34 extends vertically downward from the shaft seat 323 and forms a free end 342 at an end away from the shaft seat 323. The magnetic group 36 is annular and is attached to the inner surface of the side wall 324 of the hub 32. A plurality of blades 38 are disposed around the periphery of the side wall 324 and extend radially outward from the side wall 324 and are spaced apart from each other.

Each blade 38 includes a connecting section 381 extending outwardly from the hub 32 and an extension 383 remote from the hub 32. The connecting section 381 is a smooth curved piece which is gradually bent outward in the clockwise direction from the side wall 324 of the hub 32 and whose width gradually increases from the proximal end connected to the side wall 324 toward the distal end away from the side wall 324. . The extending portion 383 is a rectangular sheet body extending outward from the distal end of the connecting portion 381, and the upper and lower opposite ends thereof are coplanar with the highest point and the bottommost point of the distal end. The length of the extension 383 extending outward from the sidewall 324 is much smaller than the length of the connecting segment 381 extending outward from the sidewall 324. A longitudinal flange 385 is obliquely extended on the outer side of the upper end of the extending portion 383. The outer end of the flange 385 is coplanar with the outer end of the extension 383. The length of the flange 385 is slightly smaller than the extension The length of segment 383. The width of the flange 385 is smaller than the width of the extension 383. The flanges 385 of the blades 38 are bent around the hub 32 in a counterclockwise direction.

The stator 20 includes a stator core 22, a coil 24, a circuit board 26, and an insulating frame 28. The insulating frame 28 encloses the stator core 22 therein. The coil 24 is wound around an insulating frame 28. The circuit board 26 is disposed at a bottom end of the insulating frame 28 and electrically connected to the coil 24. The center of the stator core 22, the insulating frame 28, and the circuit board 26 respectively form coaxial holes corresponding to each other, and after assembly, a mounting hole 27 penetrating vertically is formed in the center of the entire stator 20.

The fan frame 10 includes a hollow frame 12 and a base 14 disposed at the center of the bottom of the frame 12. An air inlet 17 is formed at the top of the frame 12, and an air outlet 18 is formed at a bottom opposite to the air inlet 17. The base 14 is disposed at the center of the air outlet 18 . A center pillar 15 is disposed at a center of the base 14 , and the center pillar 15 protrudes from an upper surface of the base 14 in a direction of the air inlet 17 . The center pillar 15 is a columnar body having a through hole 150 formed in the center thereof in the axial direction, and a pair of bearings 80 are accommodated in the through hole 150.

When the heat dissipating fan 100 is assembled, the stator 20 is sleeved around the center pillar 15 , and the top end of the center pillar 15 passes through the mounting hole 27 from the bottom to the bottom through the circuit board 26 of the stator 20 and the insulating frame. 28. The stator core 22 is housed in a mounting hole of the stator 20. The hub 32 of the rotor 30 covers the stator 20, and the free end 342 of the rotating shaft 34 is inserted into the shaft hole of the upper and lower bearings 80, and the rotor 30 is supported by the bearing 80 to rotate relative to the stator 20. The flange 385 of the blade 38 is located at the top end of the fan frame 10.

When the heat dissipation fan 100 is used, the rotor 30 rotates relative to the stator 20 to pull out the air between the blades 38, so that the outside air enters the interior of the heat dissipation fan 100 from outside the air inlet port 17, and the air is directed from the air inlet port 17 toward the air outlet port 18. The direction of the blade 38 and the flange 385 are pressed downward, and then the cooling fan 100 flows out of the air outlet 18.

In the present application, since the upper end of the blade 38 is provided with an inclined flange 385, the pressure-receiving area of the rotor 30 is increased relative to the conventional blade, so that the air is forced into the cooling fan 100 to strengthen the lower portion of the rotor 30. The pressure, in turn, enhances the axial downward pressure of the rotor 30 and reduces the axial vibration, thus reducing noise generation.

It can be understood that in other embodiments, the flange 385 can also be disposed at the lower end or other portion of the extension 383 and the structure is not limited to the elongated sheet as long as it can increase the pressure receiving area of the rotor 30. Just fine.

In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

10‧‧‧Fan frame

12‧‧‧ hollow frame

14‧‧‧ pedestal

15‧‧‧中柱

17‧‧‧Air inlet

18‧‧‧air outlet

20‧‧‧ Stator

22‧‧‧ Stator core

24‧‧‧ coil

26‧‧‧ Circuit board

27‧‧‧Installation holes

28‧‧‧Insulation frame

30‧‧‧Rotor

32‧‧·wheels

34‧‧‧ shaft

36‧‧‧Magnetic Group

38‧‧‧ fan leaves

80‧‧‧ bearing

100‧‧‧ cooling fan

150‧‧‧Perforation

322‧‧‧ top wall

323‧‧‧ shaft seat

324‧‧‧ side wall

342‧‧‧Free end

385‧‧‧Folding

Claims (9)

A cooling fan includes a fan frame, a stator and a rotor housed in the fan frame, the fan frame has opposite air inlets and air outlets, and the rotor is rotatable relative to the stator, and the improvement is that the rotor includes a hub and a fan blade extending outward from the hub, wherein one end of the blade is formed with a slanted hem, each of the blades includes a connecting portion extending outward from the hub and extending outward from the connecting portion The extending section is a smooth curved piece, the extending section is a rectangular piece, and the folded edge is disposed at an upper end of the extending section, and enters the inside of the cooling fan from the air inlet The air is pressed toward the air outlet to press the flange and the blade, and then flows out of the air-dissipating fan from the air outlet. The heat dissipation fan of claim 1, wherein the flange is disposed around the hub in a counterclockwise direction. The heat dissipation fan of claim 1, wherein the connecting section is bent in a clockwise direction from the hub. The heat dissipation fan of claim 3, wherein the width of the connecting section gradually increases from a proximal end connected to the hub toward a distal end away from the hub. The heat dissipation fan of claim 4, wherein the extension extends outwardly from the distal end of the connecting section and the upper and lower opposite ends of the upper and lower ends are at the highest point and the lowest point of the distal end. surface. The heat dissipation fan of claim 4, wherein a length of the extension extending outward from the hub is less than a length of the connection section extending from the hub. The heat dissipation fan according to claim 1, wherein the folded edge is a vertically long piece. The heat dissipation fan of claim 7, wherein the length of the flange is smaller than the length of the extension. The heat dissipation fan of claim 7, wherein the fan blades are radially spaced apart.