Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having tangential inlet or outlet
Reexamination Certificate
2001-03-07
2002-11-12
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
C415S206000
Reexamination Certificate
active
06478538
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a window type air conditioner, and more particularly, to a turbo fan housing in an indoor part of a window type air conditioner.
2. Background of the Related Art
FIG. 1
illustrates a longitudinal section of a related art window air conditioner having a sirocco fan applied thereto, inclusive of an indoor part
10
and an outdoor part
20
.
The indoor part
10
is provided with an indoor heat exchanger
11
in a front portion thereof, and an indoor fan
12
on an inner side thereof for forced flow of room air into the indoor part
10
through the indoor heat exchanger
11
. The indoor fan
12
is surrounded by a fan housing
13
which guides the room air in/out of the indoor part
10
. There is an outdoor heat exchanger
21
in a rear portion of the outdoor part
20
, and an outdoor fan
23
on an inner side of the outdoor heat exchanger
21
for forced in/out of outdoor air through the outdoor part
20
. There is a shroud
24
between the outdoor fan
23
and the outdoor heat exchanger
21
, for guiding the outdoor air to the outdoor heat exchanger
21
and therefrom to a rear of the window air conditioner. In the meantime, the indoor fan
12
and the outdoor fan
23
are coupled to both ends of a motor
25
shaft for receiving rotation forces. And, there is a compressor
26
connected to the indoor and outdoor heat exchangers
11
and
21
through a refrigerant tube
27
having a capillary tube(not shown). Since the foregoing window type air conditioner requires a large flow rate, and a high static pressure air, as the indoor fan
12
, a sirocco fan(given a reference symbol “
12
”), a kind of centrifugal multi-blade blower, is used as the indoor fan
12
for meeting the above requirements.
FIG. 2
illustrates a section of the fan housing across line I—I in FIG.
1
. Referring to
FIG. 2
, the sirocco fan
12
is provided with a disk formed main plate
122
, a rotating shaft
123
on a center of the main plate
122
, a plurality of blades
121
fitted along a circumference of the main plate
122
parallel to the rotating shaft
123
, and a rim
124
fixed to free ends of the blades
121
. In this instance, the blade
121
is backward curved, with an outlet angle &agr; greater than 90°, to enhance an inflow, and a smooth outflow of the room air.
FIG. 3
illustrates a partial perspective view of a fan housing
13
having a related art sirocco fan
12
provided thereto. Referring to
FIGS. 1 and 3
, the fan housing
13
is provided with a flow guide
131
for accumulating room air discharged from the sirocco fan
12
to form a large quantity of air, and to convert a portion of dynamic pressure of the room air into a static pressure, and a discharge part
132
for discharging the room air through a front face of the window type air conditioner. The flow guide
131
has an inlet plate
131
b
having a bell mouth
131
a
formed therein for guiding the room air, a base plate
131
c
having a rotating shaft
123
of the sirocco fan
12
mounted therein, and a separation wall
131
d
between the inlet plate
131
b
and the base plate to surround the sirocco fan
12
in a scroll form. And, there is an opening
131
e
on one side of the flow guide
131
, from which the base plate
131
c
and the separation wall
131
d
are extended to form an outlet
132
. And, there is a cutoff
133
of a triangular section on an inside of the separation wall
131
d
connecting a lower portion of the opening
131
e
in the flow guide
131
and a lower portion of the outlet
132
, with a peak higher than a bottom of the outlet
132
, for dropping a speed of the room air when the room air flows from the flow guide
131
to the outlet
132
, to convert a portion of the dynamic pressure into a static pressure.
When the window type air conditioner is put into operation, the compressor
26
comes into operation so that the refrigerant is involved in compression, condensation, expansion, and evaporation as the refrigerant passes through the compressor
26
, the outdoor heat exchanger
21
, the capillary tube in the refrigerant tube
27
, and the indoor heat exchanger
11
. Consequently, the indoor heat exchanger
11
is at a temperature lower than the indoor part, and the outdoor heat exchanger
21
is at a temperature higher than the outdoor part. In the meantime, on the same time with the operation of the compressor
26
, the motor
25
also comes into operation to start operation of the sirocco fan
12
and the outdoor fan
23
, too. The room air passes, and has a heat exchanged through the indoor heat exchanger
11
as the sirocco fan
12
rotates, and is converted into a low temperature room air. Then, the room air flows in/out of the sirocco fan
12
, to flow in a flow passage formed by the sirocco fan
12
and the flow guide
131
. The flow passage has a smooth streamlined as the separation wall surrounds the sirocco fan
12
in a scroll form, to facilitate a smooth flow of the room air. However, a section of the flow passage becomes the larger in a direction of the air flow, to reduce a speed of room air as the room air flows along the flow passage, with a rise of the static pressure of the room air as a portion of the dynamic pressure of the room air is converted into a static pressure. Particularly, the static pressure of the room air rises sharply since the speed of the room air drops sharply as the room air passes over the cutoff
133
. Eventually, the room air discharged to forward of the window type air conditioner through the outlet
132
has a high static pressure. On the other hand, the outdoor air has a heat exchanged into a high temperature outdoor air as the outdoor air flows through the outdoor heat exchanger
21
via outdoor air inlet holes
22
by the outdoor fan
23
, and is discharged out of the outdoor part
20
.
However, the window type air conditioner having the related art sirocco fan
12
applied thereto has the following problems.
First, though the sirocco fan has a high pressure and a high flow rate of air, the sirocco fan has a poor fan efficiency, to increase power consumption of the fan motor, resulting in a poor efficiency of the window type air conditioner system.
Second, commercially available turbo fans have a fan efficiency significantly higher than the sirocco fan. However, the turbo fan can not be applied to the indoor fan of the window type air conditioner since the turbo fan has a static pressure and a flow rate poorer than the sirocco fan, when the turbo fan and the sirocco fan are compared in the bulk size basis.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a turbo fan housing in a window type air conditioner that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a turbo fan housing in a window type air conditioner, which can provide adequate flow rate and static pressure even if a turbo fan is applied to the window type air conditioner.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the turbo fan housing in a window type air conditioner including a flow guide including an inlet plate having a bell mouth for guiding room air, a base plate opposite to the inlet plate having an indoor fan mounted thereto for drawing the room air, and a separation wall between the inlet plate and the base plate to surround the turbo fan, an outlet formed by extension of the base plate and the separation wall from an opening formed on one side of the flow guide, and a cutoff forme
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Look Edward K.
Nguyen Ninh
LandOfFree
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