HEAT DISSIPATING FAN
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.
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1. Field of the Invention
The invention relates to a heat dissipating fan and, more particularly, to a heat dissipating fan capable of holding a magnetic member stably and preventing a rotor from coming off a stator effectively.
2. Description of the Prior Art
Referring to
In general, the magnetic member 142 is attached on the inner wall of the fan wheel 140 by an adhesive (e.g. anaerobic adhesive) . However, the quality of the anaerobic adhesive may degrade easily after being used for a long time or under high temperature such that the magnetic member 142 may come off the fan wheel 140. Furthermore, when the rotor 14 is rotating, the rotor 14 may come off the stator 12 due to vibration induced by high speed rotation. Accordingly, the heat dissipating fan may have a breakdown or other components within an electronic device maybe damaged. Moreover, referring to
The invention provides a heat dissipating fan capable of holding a magnetic member stably and preventing a rotor from coming off a stator effectively, so as to solve the aforesaid problems.
According to an embodiment of the invention, a heat dissipating fan comprises a stator and a rotor. The stator comprises a bearing and a winding structure, wherein the bearing is disposed in the winding structure. The rotor comprises 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.
As mentioned in the above, the invention disposes the magnetic member in the ring-shaped casing and utilizes the at least one protruding portion, which protrudes from one side of the ring-shaped casing inwardly, to hold the magnetic member. Furthermore, when the axle of the rotor is inserted into the bearing of the stator, the protruding portion, which protrudes from one side of the ring-shaped casing inwardly, is extended below the winding structure so as to interfere with the winding structure. Accordingly, the protruding portion can prevent the rotor from coming off the stator when the rotor is at rest or rotating.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
Referring to
As shown in
The rotor 34 comprises a fan wheel 340, a ring-shaped casing 342 and a magnetic member 344, wherein the ring-shaped casing 342 is disposed in the fan wheel 340 and the magnetic member 344 is disposed in the ring-shaped casing 342. As shown in
Furthermore, the fan wheel 340 has an axle 348. In this embodiment, a width W of the protruding portion 346 is smaller than the gap 326 between two adjacent teeth 324. Accordingly, the operator can align the protruding portions 346 of the rotor 34 with the gaps 326 between the teeth 324 correspondingly, make the protruding portions pass through the gaps 326, and insert the axle 348 into the bearing 320 of the stator 32 such that the winding structure 322 is located within the magnetic member 344, as shown in
When the heat dissipating fan 3 is powered on, the coils (not shown), which are wound around the teeth 324, switch magnetic pole alternately such that a magnetic force is induced between the coils and the magnetic member 344, so as to drive the fan wheel 340 to rotate. Consequently, air can be guided by the fan wheel 340 to flow. The protruding portions 346 interfere with the teeth 324 of the winding structure 322 in an axial direction of the axle 348, so as to prevent the rotor 34 from coming off the stator 32 when the rotor 34 is at rest or rotating. It should be noted that the protruding portions 346 may be extended below other portions of the winding structure 322 except the teeth 324, so as to interfere with other portions of the winding structure 322 when the rotor 34 is at rest or rotating.
In this embodiment, the ring-shaped casing 342 may be made of, but not limited to, a magnetic induction material, wherein the magnetic induction material may be, but not limited to, electro-galvanized steel (SECC). Accordingly, a magnetic attraction force can be induced between the magnetic member 344 and the ring-shaped casing 342 such that the magnetic member 344 can be attached on the inner wall of the ring-shaped casing 342 by the magnetic attraction force without the aforesaid adhesive.
As mentioned in the above, the invention disposes the magnetic member in the ring-shaped casing and utilizes the at least one protruding portion, which protrudes from one side of the ring-shaped casing inwardly, to hold the magnetic member. Furthermore, when the axle of the rotor is inserted into the bearing of the stator, the protruding portion, which protrudes from one side of the ring-shaped casing inwardly, is extended below the winding structure so as to interfere with the winding structure. Accordingly, the protruding portion can prevent the rotor from coming off the stator when the rotor is at rest or rotating.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims
1. A heat dissipating fan comprising:
- a stator comprising a bearing and a winding structure, the bearing being disposed in the winding structure; and
- a rotor comprising a fan wheel, a ring-shaped casing and a magnetic member, the ring-shaped casing being disposed in the fan wheel, the magnetic member being disposed in the ring-shaped casing, the fan wheel having an axle inserted into the bearing such that the winding structure is located within the magnetic member, at least one protruding portion protruding from one side of the ring-shaped casing inwardly and being extended below the winding structure so as to hold the magnetic member and interfere with the winding structure.
2. The heat dissipating fan of claim 1, wherein the winding structure has a plurality of teeth and a width of the at least one protruding portion is smaller than a gap between two adjacent teeth.
3. The heat dissipating fan of claim 1, wherein the winding structure has a plurality of teeth and a length of the at least one protruding portion covers a gap between the magnetic member and the teeth.
4. The heat dissipating fan of claim 1, wherein the ring-shaped casing is made of a magnetic induction material.
5. The heat dissipating fan of claim 4, wherein the magnetic induction material is electro-galvanized steel (SECC).
Type: Application
Filed: Nov 28, 2012
Publication Date: May 29, 2014
Applicant: COOLER MASTER CO., LTD. (New Taipei City)
Inventors: Kai-Hsiang Hu (New Taipei City), Shiman Xu (New Taipei City), Jiasheng Lai (New Taipei City), Haijun He (New Taipei City)
Application Number: 13/688,162