Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having tangential inlet or outlet
Reexamination Certificate
2001-08-06
2003-01-28
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having tangential inlet or outlet
C062S262000, C417S423140
Reexamination Certificate
active
06511287
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a blowing fan assembly, and more particularly, to a blowing fan assembly which is applied to a window-type air conditioner.
2. Description of the Related Art
Generally, as shown in
FIG. 1
, a window-type air conditioner has a single case
10
. In the case
10
, there are arranged a compressor
12
for compressing refrigerant, a condenser
14
for condensing the refrigerant which is compressed by the compressor
12
, thereby decreasing the temperature of the refrigerant, and an evaporator
16
for performing a heat-exchanging function using the refrigerant which is reduced in terms of its temperature by the condenser
14
.
The space which is defined in the case
10
of the window-type air conditioner is divided into an indoor portion and an outdoor portion by a partition panel
18
.
The evaporator
16
and a blowing fan assembly
20
for circulating room air through the evaporator
16
are disposed in the indoor portion. The compressor
12
, the condenser
14
, an axial-flow fan
30
for enabling the condenser
14
to conduct a condensing function using outside air, and the like are disposed in the outdoor part.
Here, the blowing fan assembly
20
possesses, as shown in
FIG. 2
, a scroll case
22
which defines an air passage and a turbofan
24
which is located inside the scroll case
22
. A front surface of the scroll case
22
is defined, as shown in
FIGS. 3 and 4
, with a suction opening
22
a
which has a bell mouth-shaped contour and through which the room air is sucked into the scroll case
22
. Also, the front surface of the scroll case
22
is defined, at a side of the suction opening
22
a,
with a discharge opening
22
b.
The turbofan
24
is connected to a driving motor
40
. The turbofan
24
is composed of a hub
241
, a plurality of blades
242
which are located at a predetermined separation from the hub
241
, and a shroud
243
which is attached to the distal ends of the plurality of blades
242
and opposite to the hub
241
.
By the blowing fan assembly
20
, constructed as mentioned above, warm air in the room passes through the evaporator
16
by the rotating action of the turbofan
24
and is thereby cooled. Thereafter, the cooled air is drawn into the scroll case
22
through the suction opening
22
a.
Then, the drawn-in air is compressed by the plurality of blades
242
and discharged from the scroll case
22
through the discharging opening
22
b.
In this way, the temperature of the air in the room is properly adjusted so as to cool the room.
At this time, the cooled air which is discharged out of the scroll case
22
, is not immediately re-drawn into the scroll case
22
due to a static pressure increase effect which is induced inside the scroll case
22
by the presence of the shroud
243
, but instead, is dispersed over a remote region.
The refrigerant which is raised in its temperature by being brought into contact with the warm air at the evaporator
16
, is re-cooled, in the course of passing through the condenser
14
, by the outside air which flows into the outdoor portion by the rotating action of the axial-flow fan
30
, so as to be continuously circulated.
On the other hand, in the blowing fan assembly for a conventional window-type air conditioner, a sirocco fan (not shown) can be used in place of the turbofan
24
. In this regard, because the sirocco fan has a large air-blowing rate, the size of the sirocco fan can be decreased. However, when assuming that the turbofan
24
and the sirocco fan have the same air blowing rate, since the sirocco fan has increased power consumption in comparison with the turbofan
24
, the sirocco fan has the disadvantage that its operating efficiency is degraded.
As a consequence, the turbofan
24
, which has a higher operating efficiency than the sirocco fan, is frequently used for a blowing fan assembly. Due to the fact that the turbofan
24
occupies an increased volume when compared to the sirocco fan having the same air blowing rate, in order to accomplish an efficient blowing function using the turbofan, a sufficient air blowing passage must be secured in the scroll case
22
.
Thus, because the size of an air conditioner to which the turbofan
24
is applied, is larger than that of an air conditioner to which a sirocco fan of the same air blowing rate is applied, the blowing fan assembly including the aforementioned turbofan
24
adversely affects miniaturization of the air conditioner.
Moreover, in a state wherein the scroll case
22
of the blowing fan assembly, to which the turbofan
24
is applied, has the same size as that of the blowing fan assembly to which the sirocco fan is applied, if the rotational velocity of the turbofan
24
is raised so as to accomplish the desired blowing function, a problem is created in that operating noise of the driving motor
40
is increased.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made in an effort to solve the problems occurring in the related art, and thus an object of the present invention is to provide a blowing fan assembly for a window-type air conditioner, in which a scroll case is configured in such a way as to enlarge the air passage, whereby an efficient blowing function is enabled without experiencing an increase in a volume of the entire blowing fan assembly and without raising the rotational velocity of a turbofan.
In order to achieve the above object, according to one aspect of the present invention, there is provided a blowing fan assembly for a window-type air conditioner, including a scroll case and a turbofan which is disposed in the scroll case and connected with a driving motor. The turbofan has a hub, a plurality of blades which are located at a predetermined separation from the hub and a shroud which is attached to the distal ends of the plurality of blades and positioned opposite to the hub. A depression is formed on the bottom wall of the scroll case in a manner such that the diameter of the depression is larger than the outer diameter of the turbofan, and the turbofan is positioned off-center in the scroll case in such a way as to adjoin the depression, whereby the air passage, which is defined between the shroud of the turbofan and a suction opening of the scroll case, is enlarged.
According to another aspect of the present invention, an auxiliary depression which has a wedge-shaped contour, is formed at a side of the depression on the bottom wall of the scroll case, in a manner such that the auxiliary depression is gradually reduced in a direction remote from the depression so as to allow the flow rate of air discharged out of the turbofan to be increased.
According to still another aspect of the present invention, the depression is formed in a manner such that it has a depth in the range of 10-20% of the width of the scroll case, a diameter in the range of 100-110% of the outer diameter of the turbofan, and a projecting angle of 30-45°.
According to yet another aspect of the present invention, the auxiliary depression having a wedge-shaped contour is formed in a manner such that the distance between an apex thereof and the center of the depression is in the range of 140-160% of the outer diameter of the turbofan.
REFERENCES:
patent: 3680328 (1972-08-01), McCarty
patent: 4102148 (1978-07-01), Matthews et al.
patent: 4633680 (1987-01-01), Lang et al.
patent: 6032479 (2000-03-01), Choi et al.
patent: 6182460 (2001-02-01), Hernandez et al.
LG Electronics Inc.
Look Edward K.
McAleenan James M
LandOfFree
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