TWI429382B - Cooling fan - Google Patents

Description

Cooling fan

The invention relates to a heat dissipation fan, in particular to a heat dissipation fan suitable for heat dissipation of heat-generating electronic components.

The cooling fan is a key component of the computer cooling system. Improving the operating life and reliability of the cooling fan is essential to ensure the stable operation of the computer system. The design of the bearing assembly of the cooling fan plays an important role in improving the service life of the cooling fan and reducing noise.

Since the ball bearing has the characteristics of low frictional resistance and low power consumption, and the service life of the ball bearing is long, the cooling fan begins to adopt a double ball bearing structure. However, there is a gap between the ball of the ball bearing and the cage, which is not completely tight fit. Therefore, in the case of high-speed rotation, the radial and axial relative displacements of the inner and outer rings of the ball bearing are large, so that the rotating shaft and the inner ring of the ball bearing are yawed together, and form an angle with the outer ring of the ball bearing. The cooling fan is unstable in operation and generates a large noise. In addition, due to the high cost of ball bearings, the industry also uses lower cost oil bearings to replace the double ball bearing structure. However, if sufficient oil is not supplied to the oil-impregnated bearing, the service life of the oil-impregnated bearing will be seriously affected, thereby affecting the service life of the cooling fan.

In view of this, it is necessary to provide a cooling fan which is less noisy and has better lubricating properties.

A heat dissipation fan includes a bearing seat, a bearing assembly, a stator and a rotor. The rotor includes a rotating shaft. The rotating shaft is received in the bearing housing. The bearing assembly includes a ball bearing, an elastic component, and an oil bearing. An oil storage component, the ball bearing and the oil bearing are housed in the bearing housing, the rotating shaft is disposed in the ball bearing and the oil bearing, the elastic component is disposed adjacent to the ball bearing and provides a preload force to the ball bearing The oil storage element is disposed adjacent to the oil bearing to provide lubrication to the oil bearing.

Compared with the prior art, when the heat dissipation fan of the present invention is in operation, the ring cover and the buckle of the bearing seat restrict the axial movement of the elastic member and the ball bearing, so that the elastic member is elastically deformed and pressed against the ball bearing, thereby Preloading force is provided for the ball bearing to eliminate the axial clearance in the ball bearing. The radial and axial relative movement of the inner and outer rings is greatly reduced relative to the unpreloaded ball bearing, and the oil bearing limits the diameter of the shaft. To move, reduce the vibration of the rotating shaft when the cooling fan is working, reduce the noise, and the oil storage component provides sufficient lubricating oil to the oil-bearing bearing to extend the service life of the cooling fan.

1‧‧‧ cooling fan

10‧‧‧Fan frame

11‧‧‧Base

111‧‧‧ bearing housing

1111‧‧‧Protruding

1112‧‧‧Ladder through hole

1113‧‧‧ big hole

1114‧‧‧ hole

1115‧‧‧ steps

12, 3372‧‧‧ side wall

20‧‧‧ Stator

21‧‧‧ coil

22‧‧‧Insulation frame

23‧‧‧ iron core

24‧‧‧ boards

30‧‧‧Rotor

31‧‧·wheels

32‧‧‧ fan leaves

33‧‧‧ bearing assembly

332‧‧‧Flexible components

333‧‧‧Ball bearings

3331‧‧‧ inner circle

3332‧‧‧Outer ring

3333‧‧‧ balls

334‧‧‧ buckle

335, 435, 635‧‧‧ oil bearing

337‧‧‧ bottom cover

3371‧‧‧floor

338‧‧‧ wear-resistant piece

339, 340, 341, 342‧‧ ‧ oil storage components

336‧‧‧ shaft

3361‧‧‧ annular groove

343‧‧‧ magnet ring

410, 610‧‧ ‧ ring groove

4351, 6351‧‧‧ shaft neck

4352, 6352‧‧‧ shoulder shoulder

6353‧‧‧Blind hole

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

2 is a cross-sectional view showing a heat dissipating fan according to still another preferred embodiment of the present invention.

3 is a cross-sectional view of a heat dissipating fan in accordance with still another preferred embodiment of the present invention.

4 is a cross-sectional view showing a heat dissipating fan according to another preferred embodiment of the present invention.

Hereinafter, a heat dissipation fan of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the cooling fan 1 includes a fan frame 10, a stator 20, a rotor 30 rotatable relative to the stator 20, a bearing assembly 33, and a bottom cover 337.

The fan frame 10 includes a base 11 and a side wall 12 surrounding the periphery of the base 11. The stator 20 and the rotor 30 are received in the fan frame 10. The center of the base 11 is protruded upwardly to form a bearing seat 111. A stepped through hole 1112 is defined in the bearing housing 111 along the central axis. The stepped through hole 1112 includes a large hole 1113 at the lower end and a small hole 1114 at the upper end. A step 1115 is formed between the large hole 1113 and the small hole 1114. The top end of the bearing block 111 integrally protrudes radially inward to form a protruding portion 1111.

The bottom cover 337 is in the shape of a cup and includes a bottom plate 3371 and a side wall 3372 extending upwardly along the outer edge of the bottom plate 3371. The bottom cover 337 is embedded in the bottom end of the large hole 1113. The side wall 3372 of the bottom cover 337 and the large hole are formed. The inner wall of 1113 has an interference fit and seals the bottom end of the bearing housing 111.

The rotor 30 includes a hub 31, a plurality of blades 32 radially formed along the outer edge of the hub 31, and a rotating shaft 336. A permanent magnet ring 343 is attached to the inner edge of the hub 31.

The rotating shaft 336 is cylindrical and received in the bearing housing 111. One end of the rotating shaft 336 is fixed to the hub 31, and the other end extends downward to form a free end. An annular groove 3361 is formed on the outer surface of the rotating shaft 336.

The bearing assembly 33 includes a ball bearing 333, an elastic member 332, a buckle 334, an oil bearing 335 and an oil storage component 339. The ball bearing 333 and the oil bearing 335 are received in the bearing housing 111. The ball bearing 333 is inserted into the ball bearing 333 and the oil bearing 335. The buckle 334 is embedded and fixed on the annular groove 3361.

The ball bearing 333 includes an inner ring 3331, an outer ring 3332, and a ball 3333 disposed between the inner ring 3331 and the outer ring 3332. The inner ring 3331 is sleeved on the rotating shaft 336, and the outer ring 3332 is closely attached to the bearing housing 111. On the wall.

The elastic member 332 can be a spring or a telescopic sleeve with a through hole through which the shaft 336 can pass. The elastic member 332 is in close contact with the inner wall of the bearing housing 111 and is axially sandwiched between the projection 1111 and the outer ring 3332 of the ball bearing 333. The lower end of the inner ring 3331 of the ball bearing 333 abuts against the buckle 334. The oil bearing 335 is located below the buckle 334 and is axially sandwiched between the step 1115 of the stepped through hole 1112 and the upper end of the side wall 3372 of the bottom cover 337.

A wear piece 338 is disposed at the bottom of the bottom cover 337 for abutting against the free end of the rotating shaft 336. The wear piece 338 is in the shape of a disk having a diameter corresponding to the inner diameter of the bottom cover 337. The wear piece 338 is disposed between the free end of the rotating shaft 336 and the bottom cover 337 to avoid direct friction between the rotating shaft 336 and the bottom cover 337, thereby improving the service life of the rotating shaft 336.

The oil storage element 339 is made of a sponge or an oil-absorbing felt, and has a cylindrical shape. The ring is disposed on the inner wall of the bottom cover 337 and is axially embedded between the oil-impregnated bearing 335 and the wear-resistant piece 338, and the upper end thereof is abutted against the oil. The lower end of the bearing 335 has an inner diameter larger than the shaft diameter of the rotating shaft 336, and the rotating shaft 336 passes through the inner hole of the oil storing member 339.

The stator 20 is sleeved on the periphery of the bearing housing 111 and includes a core 23, a coil 21 wound around the core 23, and a circuit board 24 electrically connected to the coil 21. The core 23 is formed by stacking a plurality of layers of silicon steel sheets. The two insulating frames 22 are respectively disposed on the upper and lower sides of the core 23, and the insulating frames 22 are made of a plastic material, and have the same structural shape as the core 23. The insulating frame 22 covers the outer side of the silicon steel sheet, and the coil 21 is separated from the iron core 23 to achieve a The effect of insulation.

In this embodiment, the protruding portion 1111 of the bearing housing 111 and the buckle 334 collectively restrict the axial movement of the elastic member 332 and the ball bearing 333, so that the elastic member 332 is pre-compressed and elastically deformed, and is pressed against the ball bearing 333, thereby The ball bearing 333 is provided with a preload force to eliminate the axial play of the ball bearing 333. When the cooling fan 1 is in operation, the ball bearing 333 is subjected to a working load, and the radial and axial relative movement amounts of the inner and outer rings are greatly reduced when not pre-tightened, thereby improving the rotation precision of the ball bearing 333 and increasing the ball bearing 333. The rigidity reduces the vibration of the rotating shaft 336 when the cooling fan 1 is operated, and reduces noise. The oil-impregnated bearing 335 also causes the rotating shaft 336 to be radially restrained, so that the rotation of the rotor 30 is more stable and the service life of the cooling fan 1 is extended. The oil storage element 339 is made of sponge or oil-absorbing felt, impregnated with lubricating oil. Since the oil-impregnated bearing 335 itself is generally made into a porous structure, capillary force can be generated to absorb the lubricating oil in the oil-receiving element 339, and further, due to the oil-reserving element 339 It is placed close to the free end position of the rotating shaft 336, which can play a good role in oil storage. When the fan 1 is not working, the oil storage component 339 absorbs a large amount of lubricating oil and stores it for use when the fan 1 is in operation. When the fan 1 is in operation, the oil storage component 339 can also be distributed over the oil-impregnated bearing 335 by capillary action. The lubricating oil is absorbed back to form a sealing cycle of the lubricating oil, which provides long-lasting lubrication for the operation between the oil-impregnated bearing 335 and the rotating shaft 336, thereby prolonging the working life of the oil-impregnated bearing 335. In the present embodiment, the ball bearing 333 and the oil-impregnated bearing 335 are combined with each other to control the overall cost and achieve a good lubrication effect.

Fig. 2 shows still another preferred embodiment of the present invention, which differs from the first embodiment in that, in addition to the oil accumulating member 339 as in the first embodiment, an oil reservoir in an annular or cylindrical shape is included. The component 340 is disposed on the inner wall of the bearing housing 111. The shaft is embedded in the axial direction between the step 1115 of the bearing housing 111 and the oil-impregnated bearing 335. The lower end of the oil storage member 340 abuts the upper end of the oil-impregnated bearing 335, the inner diameter of which is larger than the shaft diameter of the rotating shaft 336, and the rotating shaft 336 passes through the oil storage element. 340. The oil storage element 340 increases the supply of lubricating oil to the oil-impregnated bearing 335, and also has the effect of distributing the lubricating oil more evenly, extending the working life of the oil-impregnated bearing 335.

FIG. 3 shows a further preferred embodiment of the present invention, which is different from the first embodiment in that a ring groove 410 is formed on the outer surface of the lower end of the oil-impregnated bearing 435, so that the outer surface of the oil-impregnated bearing 435 is stepped. The ring groove 410 includes a shoulder portion 4352 and a journal portion 4351. The oil storage element 341 is disposed in the annular groove 410 and is located between the journal portion 4351 and the bearing housing 111 and axially abuts between the shoulder portion 4352 and the bottom cover 337. The oil storage element 341 can supply the lubricating oil to the oil-impregnated bearing 435 or a sealing function to prevent the lubricating oil from leaking and to prevent the entry of impurities such as dust.

Figure 4 shows another preferred embodiment of the present invention, which differs from the first embodiment in that the bottom of the oil-impregnated bearing 635 is sealed, and a blind hole for the rotating shaft 336 is disposed in the oil-impregnated bearing 635 along the central axis. 6353, so the upper end of the oil-impregnated bearing 635 is open, and the bottom end is closed. A ring groove 610 is defined on the outer surface of the upper end of the oil bearing 635, so that the outer surface of the oil bearing 635 is stepped. The ring groove 610 includes a shoulder portion 6352 and a shaft neck portion 6351. A wear plate 338 is provided at the bottom of the blind hole 6353 for abutting against the free end of the rotating shaft 336. The oil bearing 635 is embedded in the end of the large hole 1113 of the bearing housing 111. The oil storage element 342 is disposed in the annular groove 610 and is located between the journal portion 6351 and the bearing housing 111, and the lower end abuts against the shoulder portion 6352. The oil-impregnated bearing 635 directly provides axial thrust to the rotating shaft 336, so that the cooling fan 1 is more compact in structure. The oil storage element 342 supplies lubricating oil to the oil-impregnated bearing 635 to extend the working life of the oil-impregnated bearing 635.

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.

1‧‧‧ cooling fan

10‧‧‧Fan frame

11‧‧‧Base

111‧‧‧ bearing housing

1111‧‧‧Protruding

1112‧‧‧Ladder through hole

1113‧‧‧ big hole

1114‧‧‧ hole

1115‧‧‧ steps

12, 3372‧‧‧ side wall

20‧‧‧ Stator

21‧‧‧ coil

22‧‧‧Insulation frame

23‧‧‧ iron core

24‧‧‧ boards

30‧‧‧Rotor

31‧‧·wheels

32‧‧‧ fan leaves

33‧‧‧ bearing assembly

332‧‧‧Flexible components

333‧‧‧Ball bearings

3331‧‧‧ inner circle

3332‧‧‧Outer ring

3333‧‧‧ balls

334‧‧‧ buckle

335‧‧‧oil bearing

337‧‧‧ bottom cover

3371‧‧‧floor

338‧‧‧ wear-resistant piece

336‧‧‧ shaft

3361‧‧‧ annular groove

339‧‧‧ oil storage components

343‧‧‧ magnet ring

Claims (10)

A heat dissipating fan includes a bearing seat, a bearing assembly, a stator and a rotor. The rotor includes a rotating shaft. The rotating shaft is received in the bearing housing. The improvement is that the bearing assembly comprises a ball bearing and an elastic component. An oil bearing and an oil storage component, the ball bearing and the oil bearing are housed in the bearing housing, the rotating shaft is disposed in the ball bearing and the oil bearing, the elastic component is disposed adjacent to the ball bearing and the ball bearing A preload is provided, the oil storage element being disposed adjacent to the oil bearing to provide lubrication to the oil bearing, the elastic element being spaced apart from the oil bearing. The heat dissipation fan according to claim 1, wherein the oil storage member is made of a sponge or an oil absorbing felt. The heat-dissipating fan of claim 1, wherein a buckle is embedded on the outer surface of the rotating shaft, and a protruding portion is protruded from a top end of the bearing seat, and the elastic member is sandwiched between the protruding portion and the ball Between the upper ends of the bearings, the lower end of the ball bearing abuts the buckle. According to the heat dissipation fan of claim 1, wherein the bearing housing has a stepped through hole along the central axis, the stepped through hole includes a large hole and a small hole in the axial direction, the large hole and the small hole A step is formed between the ball bearings disposed in the small hole, and the oil bearing is disposed in the large hole and positioned on the step. The heat dissipation fan of claim 4, further comprising a bottom cover, the bottom cover being embedded in a tail end of the large hole, the oil bearing bearing abutting between the step of the stepped through hole and the bottom cover . The heat dissipation fan according to claim 5, wherein the oil storage component is The cylindrical shape is disposed on the inner wall of the bottom cover, and the upper end thereof abuts against the lower end of the oil bearing, and the inner diameter is larger than the diameter of the rotating shaft, and the rotating shaft passes through the oil storage element. The heat dissipating fan of claim 4, wherein the oil bearing is provided with another oil storage element at the upper end, the other oil storage element is cylindrical, and is disposed on the inner wall of the bearing housing along the shaft. The inner diameter is greater than the diameter of the rotating shaft between the step of the stepped through hole and the oil bearing, and the rotating shaft passes through the other oil storing member. The heat dissipating fan according to the fifth aspect of the invention, wherein the outer surface of the lower end of the oil bearing has a ring groove, the ring groove includes a shaft neck portion and a shaft shoulder portion, and the oil storage member has a cylindrical shape for receiving The ring groove is disposed between the journal portion and the bearing seat, and axially abuts between the shoulder portion and the bottom cover. The heat-dissipating fan of claim 1, wherein the oil-impregnated bearing defines a blind hole for the rotating shaft to be sleeved along the central axis, and a through hole is formed in the bearing seat along the central axis, and the oil-impregnated bearing is embedded in the bearing The end of the through hole. The heat-dissipating fan according to claim 9, wherein the outer surface of the upper end of the oil-impregnated bearing defines a ring groove, the ring groove includes a shoulder portion and a shaft neck portion, and the oil storage member is cylindrical and accommodates The lower end of the oil storage member abuts against the shoulder portion of the oil-impregnated bearing in the annular groove and between the bearing seat and the journal portion.