Heat exchange – With retainer for removable article – Electrical component
Patent
1997-08-06
1999-11-09
Leo, Leonard
Heat exchange
With retainer for removable article
Electrical component
165122, 361697, 415178, 4152111, 415223, 4174237, 41742314, 417354, H05K 720
Patent
active
059795417
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a cooling fan and a cooling fan assembly which are used for cooling an object.
2. Description of Related Art
Cooling fans are widely utilized to cool the air surrounding electrical circuits in electronic apparatuses. For example, cooling fans are used in personal computers to cool the CPU and other electrical/electronic components.
This type of cooling fan has a casing that includes a casing main body with a side radiator and a lid with an aperture formed therein. A fan motor includes a rotor provided with a plurality of fan blades and a stator and is disposed in the casing. Also, an object to be cooled is joined to a base surface of the casing main body and the aperture and radiator form a circulating air flow conduit when the fan motor is driven. As a result, heat generated from the object to be cooled is dispersed and the object is cooled.
Conventional cooling fans exist in which the fan motor is arranged on the side of the lid. However, there are problems with this cooling fan in that the force of the air current is small and therefore the cooling effect is low. Also, conventional cooling fans are noisy and they typically have a casing main body that is thick.
Further, in another conventional cooling fan, the fan motor is arranged on the casing main body and a distal end of a rotational axle of the rotor is installed in the casing main body by perforating the base plate of the casing main body and using a ball bearing or washer. In this type of cooling fan, the cooling effect is diminished because the force of the air current is small and, thus, the cooling effect is low. This type of cooling fan is noisy and its casing main body is thick. Moreover, it has holes for installing the rotational axle of the rotor on the outer side base surface of the casing main body. Because the rotor is installed in the casing main body, an assembly process is required to turn the cooling fan over which reduces productivity of manufacturing.
OBJECTS OF THE INVENTION
Therefore, the objects of the present invention are to provide a cooling fan assembly in which the cooling effect is high, the assembly is easy and its casing body is thinner than convention cooling fans.
SUMMARY OF THE INVENTION
The objects are achieved by implementing a cooling fan and a cooling fan assembly of the present invention.
The cooling fan includes a casing having a casing main body with a side radiator and a lid with an aperture formed therein, and a fan motor having a rotor with a plurality of fan blades that project radially outward and a stator. By driving the fan motor, an air current is produced that flows through the aperture and the side radiator to cool the object to be cooled. An outer diameter of the fan blades is larger than an inner diameter of the aperture and the fan blades rotate without contacting the lid.
Each of the fan blades has a large diameter part and a small diameter part. The outer diameter of the large diameter part is larger than the inner diameter of the aperture. The outer diameter of the small diameter part is smaller than the inner diameter of the aperture. At least a portion of the small diameter part is positioned within the aperture.
Each of the fan blades has a cutaway portion and an edge defining the aperture is positioned within the cutaway portion. The fan motor is driven to aspirate air from the aperture and expel the air from the radiator. The stator is mounted to a base within the casing main body and the rotor is indirectly supported within the casing main body. The rotor is magnetically attracted to the base at least when the rotation of the rotor is stopped. An outer side base surface of said casing main body contacts the object to be cooled and the outer side base surface without apertures.
The radiator has a plurality of radiator plates arranged in an upright position and in the axial direction of rotation of the rotor. An air current path formed between said radiator plates has a cross-sectional area toward an air
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Leo Leonard
Seiko Epson Corporation
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