TWM451438U - Heat dissipating fan - Google Patents

Abstract

A heat dissipating fan includes a stator and a rotor. The stator includes a bearing and a winding structure, wherein the bearing is disposed in the winding structure. The rotor includes a fan wheel, a ring-shaped casing and a magnetic member, wherein the ring-shaped casing is disposed in the fan wheel and the magnetic member is disposed in the ring-shaped casing. The fan wheel has an axle inserted into the bearing such that the winding structure is located within the magnetic member. At least one protruding portion protrudes from one side of the ring-shaped casing inwardly and is extended below the winding structure so as to hold the magnetic member and interfere with the winding structure.

Description

Cooling fan

The present invention relates to a cooling fan, and more particularly to a cooling fan that can effectively hold a magnetic member and effectively prevent the rotor from coming off the stator.

Please refer to FIG. 1. FIG. 1 is a cross-sectional view of the prior art heat dissipating fan 1. As shown in FIG. 1, the cooling fan 1 includes a frame 10, a stator 12, and a rotor 14, wherein the stator 12 and the rotor 14 are disposed in the fan frame 10. The stator 12 includes a bearing 120, a plurality of pole teeth 122, and a plurality of coils 124. The pole teeth 122 are disposed around the bearing 120, and the coil 124 is wound around the pole teeth 122. The rotor 14 includes a fan wheel 140 and a magnetic member 142. The magnetic member 142 is attached to the inner side wall of the fan wheel 140, and the fan wheel 140 has a rotating shaft 144 inserted in the bearing 120. When the heat-dissipating fan 1 is energized, the coil 124 senses the magnetic poles 142 in a manner of switching the magnetic poles, thereby generating a force to drive the rotation of the fan wheel 140, thereby achieving the purpose of driving the air to generate a flow guiding effect.

Generally, the magnetic member 142 is attached to the inner side wall of the fan wheel 140 by an adhesive (for example, an anaerobic adhesive). However, the anaerobic adhesive is prone to deterioration in a long-term use or a high-temperature environment, so that the magnetic member 142 and the fan wheel 140 are misaligned and fall off. Further, during the rotation of the rotor 14, the rotor 14 may also be detached from the stator 12 due to vibration generated by high-speed rotation, thereby causing malfunction or damage to other components inside the electronic device. In addition, please refer to FIG. 2, which is a cross-sectional view of another cooling fan 1' of the prior art. As shown in Fig. 2, the cooling fan 1' is fastened with a Mylar 16 to hold the rotating shaft 144. However, under long-term use, the Mylar sheet 16 is easily detached, and the rotor 14 is detached from the stator 12 due to vibration generated by high-speed rotation.

The present invention provides a heat dissipating fan which can effectively hold the magnetic member and effectively prevent the rotor from coming off the stator during the rotation of the rotor to solve the above problem.

According to an embodiment, the heat dissipation fan of the present invention includes a stator and a rotor. The stator includes a bearing and a winding structure, wherein the bearing is disposed in the winding structure. The rotor includes a wheel, an annular casing and a magnetic member, wherein the annular casing is disposed in the fan wheel and the magnetic member is disposed in the annular casing. The fan wheel has a rotating shaft that is inserted into the bearing such that the winding structure is located in the magnetic member. At least one protrusion projects inwardly from one side of the annular housing and extends below the winding structure to hold the magnetic member and interfere with the winding structure.

In summary, the present invention places the magnetic member in the annular casing and causes at least one protrusion to protrude inward from one side of the annular casing to hold the magnetic member. In addition, when the assembled shaft of the rotor is inserted into the bearing of the stator, the protruding portion protruding inward from one side of the annular housing may extend below the winding structure to interfere with the winding structure, thereby preventing the rotor Detach the stator during rest or rotation.

The advantages and spirit of this creation can be illustrated by the following creations and the drawings. Get a better understanding.

Please refer to FIG. 3 to FIG. 7 , FIG. 3 is a perspective view of the heat dissipation fan 3 according to an embodiment of the present invention, FIG. 4 is an exploded view of the heat dissipation fan 3 in FIG. 3 , and FIG. 5 is a third diagram. FIG. 6 is a cross-sectional view of the cooling fan 3 along the line XX in FIG. 3, and FIG. 7 is a winding structure 322 and an annular casing 342 in FIG. And a bottom view of the magnetic member 344.

As shown in FIGS. 3 to 6, the heat dissipation fan 3 includes a frame 30, a stator 32, and a rotor 34. The stator 32 and the rotor 34 are disposed in the frame 30. The stator 32 includes a bearing 320 and a winding structure 322 in which the bearing 320 is disposed in the winding structure 322. In this embodiment, the winding structure 322 has a plurality of pole teeth 324 and a gap 326 exists between the two adjacent pole teeth 324. It should be noted that the number of the pole teeth 324 may be determined according to the actual application, and is not limited to the embodiment illustrated in the drawings. In practical applications, a coil (not shown) is wound around the pole teeth 324. In addition, the heat dissipation fan 3 further includes a circuit board 36 and a Hall sensor 38, wherein the Hall sensor 38 is disposed on the circuit board 36. The principle of operation of the Hall sensor 38 is well known to those skilled in the art and will not be described herein.

The rotor 34 includes a fan wheel 340, an annular housing 342, and a magnetic member 344. The annular housing 342 is disposed in the fan wheel 340, and the magnetic member 344 is disposed in the annular housing 342. As shown in Figures 54 and 6, at least one protrusion 346 is from the annular housing One of the 342 protrudes laterally inward. In this embodiment, the four protrusions 346 protrude inward from one side of the annular housing 342 corresponding to the four gaps 326 between the quadrupole teeth 324. It should be noted that the number of the protrusions 346 can be determined according to the actual application, and is not limited to the embodiment illustrated in the drawings. When the rotor 34 is assembled, the assembler first places the magnetic member 344 on the inner side wall of the annular casing 342. At this time, the protruding portion 346 can hold the magnetic member 344. Next, the assembler then places the annular housing 342 with the magnetic member 344 in the fan wheel 340. Therefore, even if the adhesive such as anaerobic adhesive is not used or the high temperature environment is operated, the protruding portion 346 of the annular casing 342 can hold the magnetic member 344 so that the magnetic member 344 does not misalign with the annular casing 342. And shedding.

In addition, the fan wheel 340 has a shaft 348. In this embodiment, the width W of the protrusion 346 is smaller than the gap 326 between the two adjacent pole teeth 324. Therefore, the assembler can align the protruding portion 346 of the assembled rotor 34 with the gap 326 between the pole teeth 324, so that the protruding portion 346 passes through the gap 326 to insert the rotating shaft 348 into the bearing 320 of the stator 32, so that the winding Structure 322 is located in magnetic member 344 as shown in FIG. In this embodiment, the length L of the protrusion 346 covers the gap 328 between the magnetic member 344 and the pole tooth 324 such that the protrusion 346 extends below the pole tooth 324 of the winding structure 322 after the rotor 34 is assembled with the stator 32. .

When the heat-dissipating fan 3 is energized, the coil (not shown) wound on the pole teeth 324 is inductively sensed with the magnetic member 344 by switching the magnetic poles, thereby generating a force to drive the rotation of the fan wheel 340 to achieve a flow of the air flow. The purpose of the effect. The protrusion 346 interferes with the pole teeth 324 of the winding structure 322 in the axial direction of the rotating shaft 348, thereby The rotor 34 is prevented from disengaging from the stator 32 during rest or rotation. It should be noted that the protruding portion 346 may also extend below other portions of the winding structure 322 to interfere with other portions of the winding structure 322 during the stationary or rotating process of the rotor 34, and not to extend to the winding structure 322. Below the pole teeth 324 is limited.

In this embodiment, the annular housing 342 can be made of a magnetically permeable material, wherein the magnetically permeable material can be an electrogalvanized steel sheet (SECC), but not limited thereto. At this time, the magnetic member 344 can be magnetically attracted to the annular casing 342 and directly adsorbed on the inner side wall of the annular casing 342 without the above-mentioned adhesive.

In summary, the present invention places the magnetic member in the annular casing and causes at least one protrusion to protrude inward from one side of the annular casing to hold the magnetic member. In addition, when the assembled shaft of the rotor is inserted into the bearing of the stator, the protruding portion protruding inward from one side of the annular housing may extend below the winding structure to interfere with the winding structure, thereby preventing the rotor Detach the stator during stationary or rotating.

The above descriptions are only preferred embodiments of the present invention, and all changes and modifications made by the scope of the patent application of the present invention should be covered by the present invention.

1,1', 3‧‧‧ cooling fan

10, 30‧‧‧ fan frame

12, 32‧‧‧ Stator

14, 34‧‧‧ rotor

16‧‧‧Mela tablets

36‧‧‧Circuit board

38‧‧‧ Hall sensor

120, 320‧‧‧ bearing

122, 324‧‧‧ teeth

124‧‧‧ coil

140, 340‧‧‧fan wheel

142, 344‧‧‧ magnetic parts

144, 348‧‧ ‧ shaft

322‧‧‧ Winding structure

326, 328‧ ‧ gap

342‧‧‧ annular housing

346‧‧‧Protruding

W‧‧‧Width

L‧‧‧ length

X-X‧‧‧ hatching

Figure 1 is a cross-sectional view of a prior art cooling fan.

Figure 2 is a cross-sectional view of another cooling fan of the prior art.

Fig. 3 is a perspective view of a heat dissipation fan according to an embodiment of the present invention.

Figure 4 is an exploded view of the cooling fan in Figure 3.

Fig. 5 is an exploded view of the heat radiating fan in Fig. 3 from another angle of view.

Fig. 6 is a cross-sectional view of the heat radiating fan taken along line X-X in Fig. 3.

Fig. 7 is a bottom view of the winding structure, the annular casing, and the magnetic member in Fig. 6.

3‧‧‧ cooling fan

30‧‧‧Fan frame

32‧‧‧ Stator

34‧‧‧Rotor

36‧‧‧Circuit board

38‧‧‧ Hall sensor

320‧‧‧ bearing

322‧‧‧ Winding structure

324‧‧‧ pole teeth

328‧‧‧ gap

340‧‧‧fan wheel

342‧‧‧ annular housing

344‧‧‧Magnetic parts

346‧‧‧Protruding

348‧‧‧ shaft

Claims (5)

A heat dissipating fan comprising: a stator comprising a bearing and a winding structure, wherein the bearing is disposed in the winding structure; and a rotor comprising a wheel, an annular casing and a magnetic member, the annular casing Provided in the fan wheel, the magnetic member is disposed in the annular housing, the fan wheel has a rotating shaft, is inserted in the bearing, such that the winding structure is located in the magnetic member, at least one protruding portion is from the ring One of the housings projects laterally inwardly and extends below the winding structure to hold the magnetic member and interfere with the winding structure. The heat dissipation fan of claim 1, wherein the winding structure has a plurality of pole teeth, and the width of the at least one protrusion is smaller than a gap between two adjacent pole teeth. The heat dissipation fan of claim 1, wherein the winding structure has a plurality of pole teeth, and a length of the at least one protrusion covers a gap between the magnetic member and the pole teeth. The heat dissipation fan of claim 1, wherein the annular housing is made of a magnetically permeable material. The heat dissipation fan of claim 4, wherein the magnetic conductive material is an electrogalvanized steel sheet.