TWI463294B - Cooling fan - Google Patents

Description

Cooling fan

The present invention relates to a heat dissipation fan, and more particularly to a heat dissipation fan for heat dissipation of electronic components.

With the rapid development of the computer industry, the CPU pursues high speed, and the heat dissipation problem caused by multi-functionalization and miniaturization becomes more and more serious. If the heat is not dissipated in a timely and effective manner, the performance of the electronic components will be greatly affected. At the same time, it will reduce the service life of electronic components. Therefore, the industry usually attaches a heat sink to the heat-generating electronic component, and uses a heat-dissipating fan to generate a forced air flow to the heat sink to accelerate heat dissipation, or directly uses a heat-dissipating fan to wind-cool the heat-generating electronic components.

A conventional cooling fan generally includes a frame and a stator and a rotor housed in the fan frame. The stator is fixed in the fan frame, and the rotor is rotatable relative to the stator. A base is arranged in the center of the fan frame, and a center pillar is integrally formed in the center of the base. A shaft hole is formed in the center of the stator. The outer diameter of the center pillar is equivalent to the inner diameter of the stator, and the stator is sleeved on the outer periphery of the center pillar, and the stator is fixed on the center pillar by gluing. However, during transportation, the cooling fan may be loosened or even disengaged from the center column due to the impact, causing the stator to move up during the operation of the rotor, causing operational interference, which may cause the cooling fan to malfunction.

In view of this, it is necessary to provide a cooling fan with a fixed stator.

A cooling fan includes a base, a stator and a rotor, and a base is provided on the base a stator fixed to the center pillar, the rotor being rotatable relative to the stator, the stator comprising a certain sub-core and an upper insulating frame and a lower insulating frame respectively disposed on upper and lower surfaces of the stator core, the inner periphery of the upper insulating frame extending inward Forming at least one tab, the middle post is formed with at least one card slot, and the tab is fastened in the card slot.

Compared with the conventional cooling fan, in the above-mentioned cooling fan, wherein the card slot is formed on the column, the inner peripheral edge of the upper insulating frame of the stator forms a tab to cooperate with the card slot on the center pillar, so that the stator is more firmly installed therein. On the column, the stator is prevented from moving up when the cooling fan is impacted, thereby avoiding the occurrence of operational interference, and the operator can visually check whether the stator and the center column are installed in place.

10, 60‧‧‧ fan frame

12‧‧‧ frame

14, 64‧‧‧ Pedestal

15, 65‧‧‧ column

16‧‧‧ Ribs

17‧‧‧Air inlet

18‧‧‧air outlet

20‧‧‧ Stator

22‧‧‧ Stator core

24‧‧‧ coil

26‧‧‧ Circuit board

28‧‧‧Upper insulation frame

29‧‧‧Insulation frame

30‧‧‧Rotor

32‧‧·wheels

34‧‧‧ shaft

36‧‧‧Magnetic Group

38‧‧‧ fan leaves

80‧‧‧ bearing

90‧‧‧ buckle

150‧‧‧Perforation

151‧‧‧ rim

152‧‧‧ embedded department

153‧‧‧Flange

154‧‧‧Affiliation

156‧‧‧ Included

157‧‧‧ Guide surface

222‧‧‧The Ministry of the Circle

224‧‧‧ extremely claw

226‧‧‧ curved wall

280‧‧‧through hole

281‧‧‧ 片片

322‧‧‧ top wall

323‧‧‧ shaft seat

324‧‧‧ side wall

342‧‧‧Free end

343‧‧‧ annular groove

155, 655‧‧‧ card slot

282, 292‧‧‧ ontology

284, 294‧‧‧ Armguards

286, 296‧‧ ‧ retaining wall

1 is a cross-sectional view showing a preferred embodiment of a heat dissipation fan of the present invention.

2 is an exploded perspective view of the stator and the center pillar shown in FIG. 1, in which the coils and circuit boards of the stator are omitted.

3 is a plan view of the stator in FIG. 2 with the coil and the circuit board omitted.

4 is a partial enlarged view of the mounting process of the stator and the center pillar of FIG. 2.

Figure 5 is a partial enlarged view of the circle V of Figure 1.

Figure 6 is a perspective view of the second embodiment of the fan frame of Figure 1.

The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

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

The rotor 30 includes a hub 32, a shaft 34, a magnetic assembly 36 and a plurality of blades 38. The 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 shaft 34 extends vertically downward from the shaft seat 323, and a free end 342 is formed at an end away from the shaft seat 323. The outer end of the free end 342 forms an annular groove 343. The magnetic group 36 is annular and is attached to the inner surface of the side wall 324 of the hub 32. The plurality of blades 38 are disposed on the periphery of the side wall 324 and extend radially outward.

The stator 20 includes a stator core 22, a coil 24, a circuit board 26, an upper insulating frame 28, and a lower insulating frame 29. The two insulating frames 28 and 29 are made of an insulating material such as a plastic material, and the two insulating frames 28 and 29 are respectively disposed at upper and lower ends of the stator core 22 to cover the stator core 22 therein. The coil 24 is wound around the two insulating frames 28, 29. The circuit board 26 is disposed at a bottom end of the lower insulating frame 29 and electrically connected to the coil 24. The stator core 22, the two insulating frames 28 and 29, and the center of the circuit board 26 respectively form coaxial holes corresponding to each other, and after assembly, a mounting hole penetrating vertically is formed in the center of the entire stator 20.

Referring to FIG. 2 and FIG. 3 together, the stator core 22 is formed by stacking a plurality of silicon steel sheets of the same shape. The stator core 22 includes an annular portion 222 and a plurality of pole claws 224 that are evenly disposed around the periphery of the annular portion 222. In this embodiment, the number of the pole claws 224 is eight. The pole claws 224 extend radially outward from the periphery of the annular portion 222. Each of the pole claws 224 is generally T-shaped with an arcuate wall 226 formed at its end. The curved walls 226 are spaced apart from each other and are located on an imaginary ring that is outside the annular portion 222 and concentric with the annular portion 222.

The shapes of the two insulating frames 28, 29 are substantially the same as those of the stator core 22, respectively. The upper insulating frame 28 includes an annular body 282 at the center and a plurality of guard arms 284 extending radially outward from the bottom of the outer periphery of the body 282. The body 282 and the ring of the stator core 22 The portion 222 corresponds to the upper and lower sides. A through hole 280 is formed in the center of the body 282, and the inner diameter of the body 282 is larger than the inner diameter of the annular portion 222. The inner periphery of the bottom of the body 282 extends inwardly to form a plurality of tabs 281. In this embodiment, the number of the tabs is eight, and each of the guard arms 284 is horizontally protruded in a direction opposite to the guard arm 284. Each tab 281 has a generally rectangular shape including an inner end adjacent the body 282 and an outer end remote from the body 282. The plurality of tabs 281 are evenly looped on the inner circumference of the bottom of the body 282 and extend toward the center of the body 282. The ends of the tabs 281 are co-located on an imaginary circumference on the inside of the body 282 and concentric with the body 282, the diameter of the circumference being smaller than the inner diameter of the stator core 22. The number of the guard arms 284 is equal to the number of the pole claws 224 on the stator core 22. Each guard arm 284 is generally T-shaped. Each side of each arm 284 extends vertically downward to form a retaining wall 286.

The lower insulating frame 29 is substantially similar in shape to the upper insulating frame 28, and includes a body 292 at the center and a plurality of guard arms 294 extending outward from the top of the top of the body 292. The two sides of the arm 294 extend vertically upward to form a retaining wall 296. . The lower insulating frame 29 is different from the upper insulating frame 28 in that the main body 292 of the lower insulating frame 29 is not provided with a tab.

The upper insulating frame 28 is disposed above the stator core 22, and the lower insulating frame 29 is disposed below the stator core 22. The two insulating frames 28, 29 sandwich the stator core 22. The main bodies 282 and 292 of the two insulating frames 28 and 29 are vertically connected to the annular portion 222 of the stator core 22 . The inner end of the tab 281 in the upper insulating frame 28 is superposed on the upper surface of the annular portion 222, and the outer end of the tab 281 protrudes from the inner edge of the annular portion 222. The guard arms 284 and 294 of the two insulating frames 28 and 29 respectively correspond to the upper and lower claws 224, and the retaining walls 286 and 296 of the insulating frames 28 and 29 are respectively disposed outside the pole claws 224, so that the stator core 22 is The pole claws 224 are completely covered in the two insulating frames 28, 29. The coil 24 is wound around the guard arms 284, 294 and the retaining walls 286, 296 of the two insulating frames 28, 29. The coil 24 is spaced apart from the stator core 22 via the insulating frames 28, 29 to be electrically insulated from the stator core 22.

The frame 10 includes a hollow frame 12, a disk-shaped base 14 disposed at the center of the bottom of the frame 12, and a plurality of ribs 16 connected between the base 14 and 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. The center of the base 14 is provided with a center pillar 15 which protrudes from the upper surface of the base 14 in the 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. The center post 15 includes an insert portion 152 at the bottom end, a set portion 156 at the top end, and an abutment portion 154 between the insert portion 152 and the nest portion 156. The outer diameter of the center pillar 15 in the axial direction is the largest at the insertion portion 152, and the second at the abutment portion 154, and the smallest at the fitting portion 156. The embedding portion 152 can be embedded in the susceptor 14 and fixed to the susceptor 14 by means of insert molding. The top end and the bottom end of the embedding portion 152 extend outwardly to form a sheet-like rim 151. The two rims 151 are axially spaced apart from each other, and have an outer diameter larger than an outer diameter of the embedding portion 152. The two ring edges 151 are flush with the top surface and the bottom surface of the base 14, respectively, and the two ring edges 151 are advantageous for the center pillar 15 to be more firmly fixed in the base 14 without being easily detached.

The outer diameter of the sleeve portion 156 is equivalent to the inner diameter of the annular portion 222 of the stator core 22, so that the stator core 22 can be sleeved on the outer periphery of the sleeve portion 156. The top end of the sleeve portion 156 forms a circular chamfer so that the top end of the sleeve portion 156 forms a smooth guiding surface 157. The periphery of the top of the sleeve portion 156 is recessed inwardly from the outer surface under the chamfer to form an annular card slot 155. The outer diameter of the sleeve portion 156 at the card slot 155 is equivalent to the diameter of the circumference of the upper insulating frame 28 on which the end of the tab 281 is located. The outer diameter of the abutting portion 154 is larger than the inner diameter of the annular portion 222 of the stator core 22, so that the ring can be made The bottom end of the portion 222 abuts against the top end of the abutting portion 154 to restrict the stator 20 from moving downward.

The central portion of the inner surface of the center pillar 15 projects inwardly to form an annular flange 153. A pair of bearings 80 are received in the through holes 150 of the center pillar 15, and the pair of bearings 80 are respectively located on the upper and lower sides of the flange 153. The bottom end of the upper bearing 80 is positioned against the upper surface of the flange 153, and a spring (not labeled) is disposed between the top end of the lower bearing 80 and the lower surface of the flange 153. The top end of the lower bearing 80 is The spring is positioned against the bottom, and a lower end of the lower bearing 80 is provided with a buckle 90. The frame 12, the base 14 and the ribs 16 are integrally formed by injection molding. The center pillar 15 may be made of a plastic material or a metal material. In the present embodiment, the center pillar 15 is made of copper. When the fan frame 10 is molded, the preformed center pillar 15 can be placed in an injection mold integrally formed with the frame body 12, the base 14 and the ribs 10.

When the heat dissipating fan 100 is assembled, the stator 20 is sleeved on the outer periphery of the center pillar 15. The top end of the sleeve portion 156 of the center pillar 15 passes through the circuit board 26 of the stator 20 and the lower insulation frame 29 in order from bottom to top. The stator core 22 and the upper insulating frame 28 are housed in the mounting holes of the stator 20. Referring to FIG. 4, when the sleeve portion 156 passes through the upper insulating frame 28, the end of the tab 281 of the upper insulating frame 28 firstly abuts against the guiding surface 157 of the top end of the sleeve portion 156 of the center pillar 15, and is guided along the guide portion 156. The guiding surface 157 gradually slides downward and continuously presses the guiding surface 157, causing the protruding piece 281 to be bent upward. Under the guidance of the guiding surface 157, the protruding piece 281 is further moved during the downward movement of the stator 20. Bending upward until the tab 281 slides to the slot 155 below the chamfer. Referring to FIG. 5, since the slot 155 leaves an extension space for the tab 281, the tab 281 is no longer pressed by the guiding surface 157. The force of the tab 281 is restored to the direction of the center pillar 15 by the elastic force of the material, and protrudes into the slot 155. At this time, the bottom end of the annular portion 222 of the stator core 22 abuts against the abutting portion 154 of the center pillar 15, the stator 20 is already in the mounting position, and the tab 281 is locked in the card slot 155, thereby bringing the stator 20 tightly. Buckle on the periphery of the center pillar 15 to effectively prevent the stator 20 Falling off from the center column 15. 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.

When the stator 20 is mounted on the center pillar 15, since there is no barrier above the tab 281 of the upper insulating frame 28, the tab 281 can be elastically deformed as a whole when it is pressed. The tab 281 can be brought to a predetermined amount of deformation by applying a small mounting force, thereby facilitating easy and convenient installation.

When the installed stator 20 is applied to move it up. Since the inner end of the body 282 of the insulating frame 28 is superposed on the annular portion 222 of the stator core 22, the inner end of the tab 281 is blocked by the stator core 22 below it, and cannot be generated downward. The bending deformation is such that the outer end of the tab 281 protruding only from the inner edge of the stator core 22 can be bent downward. It is well known that to achieve the same amount of deformation for objects of the same material and different lengths, the force required for longer objects is much less than the force required for shorter objects. Therefore, the stator 20 must be detached from the center pillar 15 under a large external force, and the stator 20 is hard to fall off the center pillar 15 under natural impact as compared with the conventional heat radiating fan. In addition, since the top end of the center pillar 15 is chamfered, the stator 20 can be guided to move downward, and the tab 281 is gradually deformed, thereby making the installation more convenient. Moreover, since the tab 281 is disposed on the upper insulating frame 28, the operator can visually check whether the tab 281 is completely fastened in the slot 155 during installation, thereby preventing the mounting of the bracket 20 and the center pillar 15 from being in place. The buckles are not tight.

FIG. 6 shows another embodiment of the fan frame in the heat dissipation fan 100. The fan frame 60 in this embodiment is similar to the fan frame 10 in the above embodiment, and includes a square frame 12 disposed at the center of the frame 12. A base 64 and a rib 16 connected to the frame 12 and the base 64 are provided with a center pillar 65 at the center of the base 64. This embodiment differs from the fan frame 10 in that: When the frame 60 is formed, the center post 65 is integrally molded with the base 64 by injection molding. A plurality of card slots 655 are formed in the center pillar 65. Each of the card slots 655 is formed on the center pillar 65 so as to form a hole and extends in the axial direction of the center pillar 65. The plurality of card slots 655 are substantially parallel and are evenly spaced apart on the center post 65 in the circumferential direction. The number of card slots 655 is equal to the number of tabs 281 on the upper insulating frame 28. Each of the slots 655 corresponds to one of the tabs 281 , so that the eight tabs 281 of the upper insulating frame 28 can be respectively engaged in the slots 655 of the center post 65 . The center post 65 not only prevents the upper insulating frame 28 from moving up in the axial direction, but also limits the circumferential displacement of the upper insulating frame 28 to achieve the circumferential positioning of the upper insulating frame 28.

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.

15‧‧‧中柱

151‧‧‧ rim

153‧‧‧Flange

155‧‧‧ card slot

157‧‧‧ Guide surface

280‧‧‧through hole

282, 292‧‧‧ ontology

286, 296‧‧ ‧ retaining wall

150‧‧‧Perforation

152‧‧‧ embedded department

154‧‧‧Affiliation

156‧‧‧ Included

28‧‧‧Upper insulation frame

281‧‧‧ 片片

284, 294‧‧‧ Armguards

29‧‧‧Insulation frame

Claims (8)

A cooling fan includes a base, a stator and a rotor. The base is provided with a center pillar. The stator is fixed on the center pillar, and the rotor is rotatable relative to the stator. The stator includes a stator core and is respectively disposed on the stator core. The upper insulating frame and the lower insulating frame of the upper and lower surfaces are improved in that the inner peripheral edge of the upper insulating frame extends inwardly to form a plurality of tabs, and the middle post forms a plurality of card slots, and the tabs are fastened to the card slot. Each of the card slots is formed on the center pillar and extends along the axial direction of the center pillar in a manner of forming a hole, and the plurality of card slots are evenly spaced on the center pillar in the circumferential direction. The heat dissipation fan of claim 1, wherein the fin has a square rectangle. The heat dissipation fan of claim 1, wherein the stator core comprises a ring portion at a middle portion, and each of the at least one tab includes an inner end and an outer end, the inner end being stacked The outer end protrudes from the inner edge of the annular portion on the annular portion of the stator core. The heat dissipation fan according to claim 1, wherein the plurality of the fins are plural. The heat dissipation fan of claim 1, wherein the plurality of tabs are evenly distributed on an inner circumference of the upper insulating frame, and the ends of the plurality of tabs are collectively located on an imaginary circumference, the diameter of the circumference being not less than The outer diameter of the column at the card slot. The heat dissipating fan according to claim 1, wherein the top end of the center pillar forms a chamfer so that the top end of the center pillar forms a smooth guiding surface. The heat dissipation fan of claim 1, wherein the center pillar comprises a set of a joint portion at the top end and an abutting portion at a bottom end of the sleeve portion, the outer diameter of the abutment portion being larger than the sleeve portion The outer diameter of the stator core of the stator abuts against the abutting portion. The heat dissipation fan according to claim 7, wherein the center pillar is made of a metal material, and the center pillar further includes an insert portion at a bottom end of the abutting portion, the outer diameter of the insert portion being larger than the outer portion of the abutting portion The insertion portion is embedded in the base, and the top end and the bottom end of the insertion portion are respectively convex outward The extension extends to form a rim which is flush with the top and bottom surfaces of the pedestal, respectively.