Rotary kinetic fluid motors or pumps – Plural runners supported for relative motion or on separate... – Serially spaced in working fluid flow path
Reexamination Certificate
2003-06-20
2004-12-07
Verdier, Christopher (Department: 3745)
Rotary kinetic fluid motors or pumps
Plural runners supported for relative motion or on separate...
Serially spaced in working fluid flow path
C415S061000, C415S193000, C415S209100, C415S213100, C415S214100
Reexamination Certificate
active
06827549
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat-dissipating module. In particular, the present invention relates to a heat-dissipating module including a plurality of serially connected heat-dissipating fans.
2. Description of Related Art
FIG. 1
is an exploded perspective view of a conventional heat-dissipating module.
FIG. 2
is a perspective view of the conventional heat-dissipating module. The heat-dissipating module includes a first fan unit
10
, a second fan unit
20
that is serially connected to the first fan unit
10
, and a stationary blade
30
. The first fan unit
10
is located on the air inlet side, and the second fan unit
20
is located on the air outlet side. The stationary blade
30
is provided on a base portion of a casing
100
of the first fan unit
10
for guiding air current and for increasing the wind pressure. Generally, the casing
100
of the first fan unit
10
includes a plurality of engaging notches or grooves
111
and the casing
200
of the second fan unit
20
includes a plurality of engaging tabs
21
for engaging with the engaging grooves
11
, thereby serially connecting the first fan unit
10
and the second fan unit
20
together. Thus, air is driven by a fan wheel (not shown) of the first fan unit
10
and a fan wheel
22
of the second fan unit
20
, thereby rapidly blowing the air from the air inlet side to the air outlet side.
Although the amount of blown air and the velocity of the air are increased through the use of the above-mentioned heat-dissipating module, several problems still exist. Firstly, cool air can only be sucked into the heat-dissipating module via a single air inlet of the first fan unit
10
on the air inlet side under normal operation of the first fan unit
10
and the second fan unit
20
. The overall air output amount is limited. Second, when the first fan unit
10
operates abnormally, the speed of the first fan wheel is lowered and thus adversely affects the air-blowing efficiency of the second fan wheel
22
and the overall heat-dissipating efficiency. Third, when the first fan unit
10
operates abnormally, the air density distribution is not uniform since the air velocity at the first fan wheel is different from that at the second fan wheel
22
, resulting in poor static pressure-flow rate characteristics and poor P-Q characteristics and generating wind noise.
OBJECTS OF THE INVENTION
An object of the present invention is to provide a heat-dissipating module including two serially connected fan units and at least one side air inlet for introducing more air into the heat-dissipating module. The overall air inlet amount and the overall air outlet amount are increased, and the overall heat-dissipating efficiency is improved.
Another object of the present invention is to provide a heat-dissipating module include two serially connected fan units and at least one side air inlet for introducing more air into the heat-dissipating module when the first fan unit operates abnormally and thus fails to provide a sufficient air inlet amount. Non-uniform air density distribution in the heat-dissipating module is avoided, and the noise generated during operation of the heat-dissipating module is reduced. The overall heat-dissipating efficiency is thus improved.
SUMMARY OF THE INVENTION
To achieve the aforementioned objects, the present invention provides a heat-dissipating module including a first fan unit, a second fan unit, and connecting means for connecting the first fan unit and the second fan unit in a serial manner. The first fan unit is located on an air inlet side and includes a casing and a fan wheel received in the casing of the first fan unit. The second fan unit is located on an air outlet side and includes a casing and a fan wheel received in the casing of the second fan unit. At least one side air inlet is defined between the casing of the first fan unit and the casing of the second fan unit for increasing an air inlet amount and an air outlet amount of the second fan unit.
The air inlet amount and the air outlet amount of the second fan unit are increased. Thus, when the fan wheel of the first fan unit operates abnormally and thus results in a low air-blowing efficiency, the fan wheel of the second fan unit compensates the shortage of air inlet amount resulting in abnormal operation of the fan wheel of the first fan unit by introducing air into the heat-dissipating module via the side air inlet. The air density distribution is uniform, and the noise during operation is reduced.
Other objects, advantages and novel features of this invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 3083893 (1963-04-01), Dean
patent: 4164852 (1979-08-01), Anzalone
patent: 5258676 (1993-11-01), Reinhardt et al.
patent: 5572403 (1996-11-01), Mills
patent: 6244818 (2001-06-01), Chang
patent: 6343014 (2002-01-01), Lin
patent: 6537019 (2003-03-01), Dent
patent: 6612817 (2003-09-01), Lin et al.
patent: 6626653 (2003-09-01), Lin et al.
patent: 6663342 (2003-12-01), Huang et al.
Hong Yin-Rong
Horng Alex
Bacon & Thomas PLLC
Sunonwealth Electric Machine Industry Co. Ltd.
Verdier Christopher
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