The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "With the constantly widened applications in different fields thereof, cooling fans have been used with many electronic devices with special purposes, such as central processing units (CPU), servers, power supplies, communication chassis, and telecommunication base stations, to work in increasingly severe environments. Since the conventional cooling fans are not provided with any protective structure against the severe environments, they are actually not suitable for use in the environments constantly invaded by foreign matters.
"It is known a rotor for the conventional cooling fan includes, from outside to inside, a plurality of blades, a housing, and a magnetic element. In consideration of good magnetic induction, a space left between the rotor and a motor of the cooling fan should not be purposefully increased. The space is considerably small and narrow compared to the size of the whole cooling fan. Generally, the magnetic element is made of a rubber material and the blades are made of a plastic material; therefore, both of them are relatively soft parts. Since the conventional cooling fan is not provided with any mechanism for removing the invaded tiny foreign matters, such as impurities and crystals, from the small and narrow space between the rotor and the motor of the fan, some abrasive impurities and external foreign matters tend to accumulate in the small space to constantly frictionally contact with the rotor, causing quick wear and damage of the rubber-made magnetic element and plastic-made blades. In worse conditions, the fan will become stuck or failed very soon and accordingly has largely shortened service life.
"In addition, the housing and the magnetic element for the conventional fan rotor have relatively high surface roughness due to their materials, and therefore have higher resistance to the air flows produced by the fan when they flow through the housing and the magnetic element, which in turn causes unstable flow field around the fan.
"In brief, the conventional fan rotor has the following disadvantages: (1) causing shortened fan service life; and (2) having higher resistance to air flows and therefore resulting in unstable flow field around the fan."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "A primary object of the present invention is to provide a fan rotor protection structure that enables prolonged fan service life.
"Another object of the present invention is to provide a fan rotor protection structure that enables more stable flow field around a fan.
"To achieve the above and other objects, the fan rotor protection structure according to the present invention includes a fan wheel and an annular member. The fan wheel includes a hub and a plurality of blades. The hub has a top portion and a side wall portion axially extended rearward from a peripheral edge of the top portion. The blades are circumferentially spaced on the side wall portion of the hub. The top portion and the side wall portion together define a receiving space in the hub. The annular member has one side aligned with and connected to an end surface of the side wall portion opposite to the top portion, and defines an opening communicable with the receiving space in the hub.
"In the fan rotor protection structure of the present invention, the annular member connected to the end surface of the side wall portion opposite to the top portion of the hub is able to stop impurities and external foreign matters from entering into and accumulating in the fan rotor, and accordingly reduces possible wear loss of the fan rotor due to frictional contact with foreign matters. In this manner, the fan rotor is protected against the risks of becoming stuck or failed easily, allowing the fan to have prolonged service life. Moreover, the annular member has smooth surfaces and can be made of a wear-resistant plastic material, an aluminum material, a stainless steel material or a wear and oxidation resistant material to have lower surface roughness than that of the fan wheel. Therefore the smooth annular member has lower resistance to the air flows produced by the fan and flowing into the fan, enabling a more stable flow field around the fan.
BRIEF DESCRIPTION OF THE DRAWINGS
"The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
"FIG. 1A is an exploded perspective view of a fan rotor protection structure according to a first embodiment of the present invention;
"FIG. 1B is an assembled view of FIG. 1A;
"FIG. 2A is an exploded perspective view of a fan rotor protection structure according to a second embodiment of the present invention;
"FIG. 2B is an assembled view of FIG. 2A;
"FIG. 3A is an exploded perspective view of a fan rotor protection structure according to a third embodiment of the present invention; and
"FIG. 3B is an assembled view of FIG. 3A."
For additional information on this patent application, see: Lin, Shih-Chieh. Fan Rotor Protection Structure. Filed
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