Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate
Reexamination Certificate
2000-09-08
2001-11-20
Lu, Jiping (Department: 3681)
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Radially extending web or end plate
C416S187000, C416S20400A, C416S207000, C416S21400A, C415S198100
Reexamination Certificate
active
06318964
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Technical Field of the Invention
This invention is related to a complex cooling fan and in particular to one which has increased cooling capacity and can be manufactured at a low cost.
(b) Description of the Prior Art
There are two ways to increase the cooling capacity of a cooling fan, i.e. increasing the area of the blade and forming an air passage between two adjacent blades. However; in order to enable the conventional cooling fan to be released from the injection molds, there must be a distance between the vertical projection of the upper point of a blade of a conventional cooling fan between the vertical projection of the lower point of an adjacent blade of the conventional cooling fan thereby making it impossible to form an air passage between two adjacent blades and therefore rendering it difficult to increase its cooling capacity. Hence, it has been proposed to make the vertical projection of the upper point of a blade coincide with the vertical projection of a lower point of an adjacent blade so that the molds must be formed with sharp angles in order to achieve this purpose thus making the molds easily damaged in working and transportation. As shown in
FIG. 1
, the conventional cooling fan
1
has a body
11
on which there are a plurality of blades
12
, wherein the vertical projection of the upper point
12
a
of a blade is coincide with the vertical projection of the lower point
12
b
of an adjacent blade. Hence, there will be a first acute angle
14
between the mold releasing line
13
and the upper point
12
a
and a second acute angle
15
between the mold releasing line
13
and the lower point
12
b.
Accordingly, there will be a sharp angle A
3
between the male mold A
1
and the female mold A
2
(see FIG.
2
), thereby making the molds be easily damaged.
Therefore, it is an object of the present invention to provide an improvement in the structure of a cooling fan which can obviate and mitigate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
This invention is related to a complex cooling fan.
It is the primary object of the present invention to provide a complex cooling fan which is composed of a plurality of fans thereby enabling it to have more blades than the conventional cooling fan and forming an air guiding passage between two adjacent blades for increasing the cooling capacity.
It is another object of the present invention to provide a complex cooling fan which can be manufactured by molds without sharp angles thus preventing the molds from damage in working or transportation and therefore reducing the manufacturing costs.
According to a preferred embodiment of the present invention, a complex cooling fan includes an upper fan including an upper fan and a lower fan, the upper fan including a first cylindrical body, a plurality of first blades extending outwardly from the cylindrical shell body, and a cylindrical collar extending downwardly from the first cylindrical shell body, the cylindrical collar having a smaller diameter than the first cylindrical shell body, a lower edge of the first cylindrical shell body being formed with a positioning notch, and a lower fan including a second cylindrical shell body and a plurality of second blades extending outwardly from the second cylindrical shell body, the second cylindrical shell body having same outer diameter as the first cylindrical shell body and having an upper edge formed with a protuberance configured to engage with the positioning notch of the first cylindrical shell body, an inner diameter of the second cylindrical shell body having same size as an outer diameter of the cylindrical collar, the cylindrical collar being fitted into the second cylindrical shell body with the positioning notch engaged with the protuberance and the first blades aligned with second thereby combining the upper and lower fans together, whereby the complex cooling fan has increased cooling capacity and the molds for manufacturing the fan can be prolonged in service life thereby reducing the manufacturing cost.
The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 5741118 (1998-04-01), Shinbara et al.
patent: 58-195099-A (1983-11-01), None
patent: 6-270893-A (1994-09-01), None
Lu Jiping
Rosenberg , Klein & Lee
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