Blower

Details Blower Blower

2002-03-14

2004-07-27

Nguyen, Ninh H. (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing having tangential inlet or outlet

C415S206000, C415S119000

Reexamination Certificate

active

06767184

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a blower which is mounted to home appliances such as an air conditioner, vacuum cleaner, etc, in order to suck and discharge air. More particularly, the present invention relates to a blower which is equipped with a turbo fan installed at the interior of a scroll housing thereof, while enlarging the angle of inclination of a cutoff of the scroll housing, thereby enhancing blowing performance and reducing noise of the blower.
2. Description of the Related Art
As well known to those skilled in the art, a blower generally includes an impeller
1
, so called a “sirocco fan”, and a scroll housing
2
adapted to guide air sucked by the impeller
1
, thereby discharging the sucked air through an outlet
26
, as shown in
FIGS. 1 and 2
.
The impeller
1
includes a plurality of blades
1
a
supported by a rib
1
b
. The impeller
1
has a shaft
11
connected to the drive unit of a motor M. When the impeller
1
is rotated in accordance with an operation of the motor M, air is sucked into the interior of the scroll housing
2
through a sucking inlet
24
formed at the front end of the scroll housing
2
while being guided by a bell mouth
25
. The sucked air is then fed along a gradually-enlarged passage to the outlet
26
, and then outwardly discharged through the outlet
26
.
The scroll housing
2
includes a body portion
2
a
having a substantially cylindrical shape while receiving the impeller
1
. The body portion
2
a
serves to guide air sucked through the sucking inlet
24
in a rotating direction of the impeller
1
. The scroll housing
2
also includes a hopper portion
2
b
extending upwardly from the body portion
2
a
. The hopper portion
2
b
serves to discharge the air introduced into the body portion
2
a
through the outlet
26
.
The scroll housing
2
is constructed by a front panel
21
defined with the sucking inlet
24
, a rear panel
22
spaced apart from the front panel
21
by a desired distance, and side panels
23
for sealing all edges of the front and rear panels
21
and
22
, except for the outlet
26
.
The hopper portion
2
b
has a right wall
23
a
extending vertically from the body portion
2
a
, and a left wall
23
b
extending inclinedly from the body portion
2
a
in such a fashion that the hopper portion
2
b
has a cross-sectional area gradually enlarged toward the outlet
26
. That is, a cutoff
3
having a concave structure is formed between the body portion
2
a
and the hopper portion
2
b.
The cutoff
3
extends from its cutoff portion
31
on the front panel
21
to it cutoff portion
32
on the rear panel
22
while being inclined with respect to the shaft
11
of the impeller
1
by an angle of &thgr;
1
. Typically, the inclination angle &thgr;
1
of the cutoff
3
is 50° or less. Air discharged from the body portion
2
a
is guided along a flow passage defined by the hopper portion
2
b
to have a gradually-enlarged cross-sectional area from the cutoff
3
, so that it is discharged from the outlet
26
in a state in which its pressure is converted from dynamic pressure into static pressure at the outlet
26
.
However, the above mentioned conventional blower has a limitation in increasing the amount of blown air because the impeller
1
called a “sirocco fan” is installed in the interior of the scroll housing
2
. Furthermore, the inclination angle &thgr;
1
of the cutoff
3
formed at the scroll housing
2
is 50° or less with respect to the shaft
11
of the impeller
1
. As a result, there is a problem in that flow resistance of air passing through the hopper portion
2
b
is increased, thereby degrading the blowing efficiency of the blower while increasing generation of noise.
SUMMARY OF THE INVENTION
Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a blower which is capable of increasing the flow rate of blown air while minimizing the flow resistance of air being discharged, thereby achieving an improvement in blowing efficiency.
It is another object of the present invention to provide a blower which is capable of reducing generation of noise.
In accordance with the present invention, these objects are accomplished by providing a blower including a motor, a blowing fan coupled to the motor via a shaft, and a scroll housing including a front panel having a sucking inlet, a rear panel, and side panels sealing all edges of the front and rear panels, except for the outlet, the scroll housing defining a body portion serving to guide air sucked through the sucking inlet in a rotating direction of the blowing fan, a hopper portion extending from the body portion while serving to discharge the air introduced into the body portion through the outlet, and a cutoff formed at a boundary between the body and hopper portions to extend the front panel to the rear panel, wherein the cutoff of the scroll housing has an inclination of 50 to 80° with respect to the shaft of the blowing fan.
Preferably, the inclination of the cutoff is ranged from 60° to 70°.
Preferably, the blowing fan is a turbo fan in accordance with the present invention.


REFERENCES:
patent: 3093299 (1963-06-01), Hammann et al.
patent: 4884946 (1989-12-01), Belanger et al.
patent: 6200093 (2001-03-01), Lee et al.
patent: 6254336 (2001-07-01), Ahn

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