TW201344056A - Cooling fan and electric device having the same - Google Patents

Abstract

A cooling fan includes a stator and a rotor covering the stator. The stator is enlaced by a coil. The rotor includes a hub and a magnetic ring. The coil generates a magnetic field when electrified, and the generated magnetic field interacts with a magnetic field generated by the magnetic ring to drive the rotor to rotate. The cooling fan also includes an inductive coil and an indicating lamp electrically connected to the inductive coil. The hub covers the inductive coil. When the rotor rotates, the inductive coil creates inductive current and transmits the inductive current to drive the indicating lamp to work. The present disclosure also provides an electronic device having the cooling fan.

Description

Cooling fan and electronic device having the same

The present invention relates to a heat dissipation fan and an electronic device having the same, and more particularly to a heat dissipation fan that can feed back information on fan operation and an electronic device having the same.

With the continuous development of the electronic information industry, the operating frequency of electronic components (such as central processing units) has been continuously increased, and the heat generated by the electronic components has also increased, and the temperature has been continuously increased, which seriously threatens the performance of electronic components. In order to ensure the normal operation of the electronic components, a heat sink is usually installed on the surface of the electronic component, and a heat dissipation fan is mounted on the heat sink to assist the electronic component to dissipate heat.

A conventional fan includes a centered center pillar, a stator fixed to the center pillar, a coil wound around the stator, a bearing embedded in the center pillar, and a rotor supported by the bearing. The rotor generally includes a hub, a plurality of blades disposed on the outer edge of the hub, and a magnetic ring attached to the inner wall of the hub. During operation, the magnetic field generated by the coil after energization interacts with the magnetic force of the magnetic ring to achieve the purpose of rotation, thereby generating an air flow to dissipate heat from the heating element.

However, after the existing cooling fan is assembled into the corresponding electronic device housing, the fan can no longer be visually recognized due to the cover of the housing. When the fan fails to rotate, the working state of the fan cannot be timely. Feedback to the outside of the housing can easily lead to overheating of electronic components. Therefore, further improvement is needed.

In view of the above, it is necessary to provide a heat dissipation fan that can feed back information on fan operation and an electronic device having the same.

A heat dissipating fan comprising a stator and a rotor covering the stator, the stator is provided with a winding coil, the rotor comprises a hub and a magnetic ring disposed on the inner wall of the hub, the coil generates a magnetic field after being energized The magnetic field generated by the magnetic ring interacts to rotate the rotor. The heat dissipation fan further includes an induction coil and an indicator light electrically connected to the induction coil. The hub covers the induction coil, and the induction coil cuts the magnetic sense when the rotor rotates. The line generates an induced current to drive the indicator light to illuminate.

An electronic device includes a housing having an opening and a cooling fan housed in the housing, the cooling fan including a stator and a rotor covering the stator, the stator is provided with a winding coil, and the rotor includes a rotor a hub and a magnetic ring disposed on an inner wall of the hub, the coil is energized to generate a magnetic field and a magnetic field generated by the magnetic ring to rotate the rotor, the heat dissipation fan further comprising an induction coil and an indicator electrically connected to the induction coil The hub cover is provided with the induction coil, and the induction coil cuts the magnetic induction line when the rotor rotates to generate an induced current to drive the indicator light to illuminate the heat dissipation fan, and the indicator light of the heat dissipation fan is disposed outside the casing.

Compared with the prior art, the heat dissipation fan of the present invention and the electronic device having the same include an induction coil disposed in the hub and an indicator light electrically connected to the induction coil. After being energized, the coil generates a magnetic field and a magnetic ring. The generated magnetic field interacts to cause the rotor to rotate. The induction coil cuts the magnetic induction line under the action of the changing magnetic field to generate an induced current, and is transmitted to the outside of the casing to cause the indicator light to emit light, so as to identify the cooling fan in the housing by the indicator light. Operational situation. The indicator light is illuminated by the magnetic field of the heat dissipation fan itself, and does not need to consume power of the system, and is convenient for energy saving.

Referring to FIG. 1 , a heat dissipation fan 100 according to an embodiment of the present invention includes a base 10 and an impeller 20 disposed on the base 10 . An induction coil 30 located in the impeller 20 and a wire passing through the induction coil 30 . 50 connected to an indicator light 40.

Specifically, the base 10 has a regular flat shape, and the center of the base 10 extends upward to form a center pillar 11 . The center pillar 11 has a cylindrical shape, and the outer wall surface of the bottom pillar 11 has a diameter along the center pillar 11 . A protrusion 12 is formed to protrude outwardly, and an inner wall surface of the bottom portion of the center pillar 11 protrudes toward a center position in the center pillar 11 to form a flange 13 which is annular and integrally formed on the center pillar 11 On the inner wall.

The impeller 20 includes a bearing 21 disposed at the center of the base 10, a stator 22 disposed outside the bearing 21, and a rotor 23 surrounding the periphery of the stator 22.

The bottom end of the bearing 21 is embedded in the center pillar 11 and abuts against the upper surface of the flange 13. The shaft of the bearing 21 is provided with a shaft hole 211 for later engagement with the rotor 23.

The stator 22 is sleeved on the periphery of the bearing 21. The stator 22 includes an annular circuit board 221 and an armature winding 222 electrically connected to the circuit board 221. The annular circuit board 221 has a slightly larger aperture than the center pillar. The outer diameter of 11 is sleeved against the periphery of the projection 12 of the center pillar 11, and the armature winding 222 is wound to form a coil 223, which generates a magnetic field after being energized.

The rotor 23 includes a hub 231 , a rotating shaft 232 extending downward from the center of the hub 231 , a plurality of blades 233 disposed on the hub 231 , a magnetic ring 234 received in the inner wall of the hub 231 , and a magnetic ring 234 and the hub 231 . A protective cover 235 between the walls.

The hub 231 includes an upper cover 236 and a side plate 237 extending integrally from the edge of the upper cover 236. The upper cover 236 is annular. The upper cover 236 is located above the stator 22 and surrounds the side plate 237. It is provided on the periphery of the stator 22, that is, the hub 231 covers the stator 22. The lower end surface of the hub 231 is separated from the circuit board 221 by a gap, and the outer diameter of the hub 231 is equal to the outer diameter of the circuit board 221.

The rotating shaft 232 is rotatably received in the shaft hole 211. An oil-proof cover 238 is disposed at the top end of the bearing 21 for sealing the lubricating oil in the shaft hole 211, that is, the rotating shaft 232, the oil-proof cover 238 and the bearing 21 are sealed together to form a closed oil storage space for lubricating oil. The subsequent lubricating oil generates a dynamic pressure distribution between the bearing 21 and the rotating shaft 232, causing the rotating shaft 232 to rotate in the bearing 21.

The blade 233 is disposed around the side plate 237 and extends outward from the side plate 237.

The magnetic ring 234 is disposed on the inner wall of the side plate 237 and parallel to the side plate 237. The height of the magnetic ring 234 is slightly smaller than the height of the side plate 237. The magnetic rings 234 are alternately distributed along the circumferential direction thereof. N and S poles, the magnetic field generated by the magnetic ring 234 interacts with the magnetic field generated by the energized coil 223, causing the rotor 23 to rotate relative to the stator 22, causing the blades 233 around the hub 231 to rotate, thereby generating airflow to achieve The effect of dissipating heat from electronic components (not shown). Of course, the N and S poles of the magnetic ring 234 can also distribute the two ends of the magnetic ring 234 in the axial direction.

The protective cover 235 is sandwiched between the magnetic ring 234 and the inner wall of the hub 231 and extends vertically to cover a portion of the upper surface of the magnetic ring 234 for reinforcing the strength of the hub 231 and the blade 233 while protecting the magnetic ring. 234.

The induction coil 30 is disposed on the circuit board 221, and the induction coil 30 is located directly below the magnetic ring 234. Here, the induction coil 30 can be strongly induced by the magnetic field of the magnetic ring 234. Of course, the induction coil 30 can also be located slightly below the magnetic ring 234 from the center. In the embodiment, the indicator light 40 is an LED indicator light disposed on the base 10 and spaced apart from the induction coil 30 by a distance. The indicator light 40 is coupled to the induction coil 30 by a wire 50 that conducts current at the induction coil 30 to the indicator light 40 to cause the indicator light 40 to illuminate. Specifically, after the heat dissipation fan 100 is energized, the coil 223 on the stator 22 is energized to generate a magnetic field, and the magnetic field generated by the magnetic ring 234 interacts with the magnetic field generated by the coil 223 to drive the rotor 23 to rotate around the stator 22. According to Faraday's law of electromagnetic induction, when a part of the conductor of the closed circuit is used to cut the magnetic induction line, a current is generated on the conductor. During the rotation of the rotor 23, the magnetic pole of the magnetic ring 234 moves relative to the induction coil 30, so that a part of the conductors on the induction coil 30 cuts the magnetic induction line to generate an induced current, and the induced current is conducted to the indicator light 40 through the wire 50. Cause the indicator light 40 to illuminate.

The heat dissipating fan 100 is disposed in the electronic device 60 for dissipating heat from an electronic component (not shown). In the embodiment, the electronic device 60 includes a housing 61. The housing 61 is disposed on the housing 61. In the base 10, the housing 61 includes a top plate 611 opposite to the base 10 and a side wall 612 connecting the base 10 and the top plate 611. The housing 61 is configured to receive the cooling fan 100 and other electronic components. The top plate 611 and the side walls 612 are formed in a regular flat shape. The side walls 612 are integrally formed vertically extending from the edge of the top plate 611. The end of the side wall 612 adjacent to the base 10 is spaced apart from the base 10 to form an opening 62 for penetrating the wire 50 connecting the induction coil 30 and the indicator light 40. The indicator light 40 is disposed outside the housing 61 and electrically connected to the induction coil 30 by the wire 50. When the electronic device 60 is in operation, the light of the external indicator light 40 of the housing 61 can be determined. The operation of the cooling fan 100 in the casing 61.

Please refer to FIG. 2 , which is another embodiment of the present invention. The heat dissipation fan 100 is basically the same as the first embodiment, except that the induction coil 30 is disposed on the armature winding of the stator 22 . 222.

Compared with the prior art, the heat dissipation fan 100 of the present invention includes an induction coil 30 disposed in the hub 231 and an indicator light 40 electrically connected to the induction coil 30. After being energized, the coil 223 generates a magnetic field and a magnetic force of the magnetic ring. The interaction causes the rotor 23 to rotate, the magnetic ring 234 continuously switches the magnetic poles, and the induction coil 30 cuts the magnetic induction line under the action of the changing magnetic field to generate an induced current, and conducts it to the outside of the housing 61 to cause the indicator light 40 to flash and emit light. The indicator light 40 determines the operation of the heat-dissipating fan 100 in the casing 61. The indicator light 40 emits light by the magnetic field of the heat-dissipating fan 100 itself, and does not need to consume power of the system, and is energy-saving.

In summary, the present invention complies with the requirements of the invention patent and submits 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.

100. . . Cooling fan

10. . . Base

20. . . impeller

30. . . Induction coil

40. . . Indicator light

50. . . wire

11. . . Middle column

12. . . Bulge

13. . . Flange

twenty one. . . Bearing

twenty two. . . stator

twenty three. . . Rotor

211. . . Shaft hole

221. . . Circuit board

222. . . Armature winding

223. . . Coil

231. . . Wheel hub

232. . . Rotating shaft

233. . . blade

234. . . Magnetic ring

235. . . Protective cover

236. . . Upper cover

237. . . Side panel

238. . . Oil proof cover

60. . . Electronic device

61. . . case

611. . . roof

612. . . Side wall

62. . . Opening

1 is a schematic cross-sectional view showing a heat sink according to an embodiment of the present invention.

2 is a cross-sectional view showing a heat sink according to another embodiment of the present invention.

100. . . Cooling fan

10. . . Base

20. . . impeller

30. . . Induction coil

40. . . Indicator light

50. . . wire

11. . . Middle column

12. . . Bulge

13. . . Flange

twenty one. . . Bearing

twenty two. . . stator

twenty three. . . Rotor

211. . . Shaft hole

221. . . Circuit board

222. . . Armature winding

223. . . Coil

231. . . Wheel hub

232. . . Rotating shaft

233. . . blade

234. . . Magnetic ring

235. . . Protective cover

236. . . Upper cover

237. . . Side panel

238. . . Oil proof cover

60. . . Electronic device

61. . . case

611. . . roof

612. . . Side wall

62. . . Opening

Claims (10)

A heat dissipating fan comprising a stator and a rotor covering the stator, the stator is provided with a winding coil, the rotor comprises a hub and a magnetic ring disposed on the inner wall of the hub, the coil generates a magnetic field after being energized The magnetic field generated by the magnetic ring interacts to rotate the rotor, and the improvement is that the heat dissipating fan further includes an induction coil and an indicator light electrically connected to the induction coil, wherein the hub covers the induction coil, and the induction coil rotates in the rotor The magnetic line is cut to generate an induced current to drive the indicator light to illuminate. The heat dissipation fan according to claim 1, wherein the magnetic ring is alternately distributed with N poles and S poles along its circumferential direction or N poles and S are respectively disposed at both ends of the magnetic ring in the axial direction. pole. The heat dissipation fan of claim 1, wherein the stator comprises an armature winding, and the induction coil is disposed on the armature winding. The heat dissipation fan of claim 3, wherein the induction coil is located below the magnetic ring. The heat dissipation fan of claim 4, wherein the stator comprises a circuit board, and the induction coil is disposed on the circuit board and directly under the magnetic ring. The heat dissipation fan of claim 5, wherein the heat dissipation fan further comprises a base, the center of the base extends upward to form a cylindrical center pillar, and the outer wall surface of the center pillar is along the radial direction of the center pillar A columnar protrusion is formed to protrude outwardly, and the circuit board is sleeved to abut the protrusion and is located on the base. The heat dissipation fan of claim 6, wherein the inner wall surface of the center pillar protrudes toward a central position in the center pillar to form a flange, and the flange is annular and integrally formed on the center pillar. The heat dissipating fan further includes a bearing disposed at a center of the base, the bottom end of the bearing is embedded in the middle post and abuts against the upper surface of the flange, and a shaft hole is disposed in the center of the bearing, the rotor The utility model comprises a rotating shaft extending downward from the center of the hub, and the rotating shaft is rotatably received in the shaft hole. The heat dissipation fan of claim 1, wherein the rotor comprises a protective cover that is interposed between the magnetic ring and the inner wall of the hub and extends perpendicularly from the top end thereof to cover the magnetic field. Part of the upper surface of the ring. The heat dissipation fan of claim 1, wherein the indicator light is an LED indicator. An electronic device includes a housing having an opening and a cooling fan housed in the housing, wherein the cooling fan is the cooling fan according to any one of claims 1 to 9, wherein the cooling fan The indicator light is disposed outside the housing.