FAN DEVICE HAVING A SELF-LUBRICATING BEARING
The present invention provides a fan device having a self-lubricating bearing. The fan device includes a fan base and at least one self-lubricating bearing. The self-lubricating bearing is disposed in a bearing hole of the fan base and has a bearing surface assembly. The bearing surface assembly is provided with at least one magnetic element. By this arrangement, the magnetic element generates a magnetic attractive force to the spindle, thereby making the spindle to return to its optimal position rapidly. In this way, wear, noise and vibration are reduced. Further, the lifetime of the fan device is extended.
1. Field of the Invention
The present invention relates to a fan device having a self-lubricating bearing, and in particular to a fan device having a self-lubricating bearing, which is capable of reducing wear, noise and vibration during its operation as well as extending its lifetime.
2. Description of Prior Art
The wide spread of electronic information products (such as computers) causes the rapid development of the electronic information industry together with increased operating speed and access capacity. Accordingly, the components of such an electronic information product generate a lot of heat in operation.
Taking a computer host as an example, the heat generated by a central processing unit (CPU) in the computer host occupies a large portion of the heat generated by the computer host. When the heat is accumulated in the CPU more and more, the performance of the CPU will come down. If the amount of heat accumulated in the CPU exceeds the upper limit of the allowable amount of heat, the computer host will crash and even suffer damage. On the other hand, in order to solve the problem caused by electromagnetic waves, a casing is provided for shielding the computer host. Thus, it is an important issue for the present Inventor to dissipate the heat of the CPU and other heat-generating elements.
The common solution for dissipating the heat of the CPU is to provide a heat sink and a heat-dissipating fan above the CPU. One side of the heat sink is provided with a plurality of fins. The other side of the heat sink without fins is brought into thermal contact with the CPU to thereby conduct the heat from the CPU to the fins. Then, the heat is rapidly dissipated to the outside by means of heat radiation and heat convection of the airflow generated by the fan.
Therefore, the prior art has the following problems:
(1) it is easy to generate vibration and noise;
(2) the wear becomes serious;
(3) the duration of noise is long; and
(4) the lifetime is shortened.
In order to solve the problems of prior art, the present inventor proposes a novel and reasonable structure based on his expert knowledge and delicate researches.
SUMMARY OF THE INVENTIONIn order to solve the above problems, an objective of the present invention is to provide a fan device having a self-lubricating bearing, which is capable of reducing wear, noise and vibration as well as extending the lifetime.
Another objective of the present invention is to provide a fan device having a self-lubricating bearing, which is capable of restoring the operational stability of the fan rapidly.
In order to achieve the above objective, the present invention is to provide a fan device having a self-lubricating bearing. The fan device includes a fan base, at least one self-lubricating bearing and a fan wheel. One side of the fan base has a sleeve. The sleeve has a bearing hole for allowing the self-lubricating bearing to be disposed therein. The self-lubricating bearing has a spindle hole and a bearing surface assembly. The bearing surface assembly is provided with at least one magnetic element. The fan wheel has a plurality of blades and a spindle. The spindle is pivotally disposed in the spindle hole. By this arrangement, the magnetic element can generate a magnetic attractive force to the spindle, so that the spindle can return to its optimal position rapidly, thereby reducing the wear, noise and vibration as well as extending the lifetime.
Therefore, the present invention has the following advantageous features:
(1) reducing the vibration and noise;
(2) reducing the wear;
(3) shortening the duration of noise; and
(4) extending the lifetime.
The above objectives and structural and functional features of the present invention will be described in more detail with reference to preferred embodiment thereof shown in the accompanying drawings
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In the present embodiment, the magnetic element 2224 is provided on both the upper bearing surface 2221 and the lower bearing surface 2222. The magnetic element 2224 may be any one of magnet, magnetic powder and an element having magnetism. The fan wheel 23 includes a plurality of blades 231 and a spindle 232. The blades 231 are circumferentially provided on the outer periphery of the fan wheel 23. The fan wheel 23 is provided on the sleeve 211. The spindle 232 is pivotally connected in the spindle hole 221. A hydraulic layer 223 forming an oil film is formed between the spindle 232 and the spindle hole 221. When the spindle 232 is assembled in the spindle hole 221, it is necessary to adjust the positional relationship among the fan base 21, the self-lubricating bearing 22 and the fan wheel 23 to the optimal state. When the positional relationship is adjusted, the magnetic elements 2224 provided on the upper bearing surface 2221 and the lower bearing surface 2222 generate a magnetic attractive force to the spindle 232, and the hydraulic layer 222 generates a supporting force to the spindle 232. Thus, the magnetic attractive force and the supporting force generated by the hydraulic layer 223 can locate the spindle 232 at the optimal position for operation. When the fan wheel 23 is in operation, the magnetic attractive force can also make the spindle 232 to be located at the optimal position. In this way, the operational stability between the spindle 232 and the self-lubricating bearing 22 is increased, the wear, noise and vibration are reduced, and the lifetime is extended.
After the fan device 2 is collided by an external force, the external force makes the spindle 232 to deviate from its original position. Even, the spindle 232 may collide with the self-lubricating bearing 22 to generate vibration. At this time, the magnetic attractive force generated by the magnetic element 2224 on the upper bearing surface 2221 and the lower bearing surface 2222 causes the spindle 232 to return to its optimal position rapidly. In this way, the wear, noise and vibration are reduced, and the lifetime is extended.
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Although the present invention has been described with reference to the foregoing preferred embodiments, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
Claims
1. A fan device having a self-lubricating bearing, including:
- a fan base having a sleeve on its one side, the sleeve having a bearing hole;
- at least one self-lubricating bearing disposed in the bearing hole, the self-lubricating bearing having a spindle hole and a bearing surface assembly, the bearing surface assembly being provided with at least one magnetic element; and
- a fan wheel having a plurality of blades and a spindle, the spindle being pivotally disposed in the spindle hole.
2. The fan device having a self-lubricating bearing according to claim 1, wherein a hydraulic layer is formed between spindle and the spindle hole.
3. The fan device having a self-lubricating bearing according to claim 1, wherein the bearing surface assembly includes an upper bearing surface and a lower bearing surface.
4. The fan device having a self-lubricating bearing according to claim 3, wherein the magnetic element is provided on the upper bearing surface.
5. The fan device having a self-lubricating bearing according to claim 3, wherein the magnetic element is provided on the lower bearing surface.
6. The fan device having a self-lubricating bearing according to claim 3, wherein the magnetic element is provided on the upper bearing surface and the lower bearing surface.
7. The fan device having a self-lubricating bearing according to claim 1, wherein bearing surface assembly further includes a middle bearing surface, the middle bearing surface is formed on a trough of an outer surface of the self-lubricating bearing, the magnetic element is provided on the middle bearing surface.
8. The fan device having a self-lubricating bearing according to claim 1, wherein the magnetic element is selected from any one of a group including a magnet, magnetic powder and an element having magnetism.
Type: Application
Filed: Dec 5, 2011
Publication Date: Jun 6, 2013
Inventors: Bor-Haw CHANG (New Taipei City), Shu-Fen LIU (New Taipei City)
Application Number: 13/311,159
International Classification: F04D 29/04 (20060101);