Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Cantilever blade
Reexamination Certificate
1999-12-30
2001-12-04
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Cantilever blade
C416S243000, C416SDIG002, C416SDIG005, C416S242000
Reexamination Certificate
active
06325597
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an axial flow fan for an air conditioner, and in particular to an axial flow fan for an air conditioner which is capable of changing the shape of blades by varying a design factor such as a chord length, a sweep angle, etc., generating an enough flowing amount of a fan for implementing an efficient heat radiation of a heat exchanger, and decreasing a noise which occurs during an air flowing operation of the fan, so that it is possible to implement a high efficiency and low noise fan system.
2. Description of the Background Art
An air conditioner is an apparatus capable of processing air and supplying the processed air into a certain interior for thereby maintaining air in a room or a building in a clean state and is classified into an integration type and a separation type.
The above-described integration type and separation type air conditioners have the same functions. However, the integration type air conditioner having an integrated cooling and heating function is installed using a fixing apparatus by forming a hole at a window or a wall. In addition, in the separation type, a cooling apparatus is installed inside a room as an indoor unit, and a heat radiating and compression apparatus is installed outside the room as an outdoor unit. The cooling apparatus and the heat radiating and compression apparatus are connected by a refrigerant pipe.
The separation type air conditioner will be explained.
The separation type air conditioner includes an indoor unit for performing a cooling function, an outdoor unit for performing a heat radiating and compression function, and a refrigerant pipe for connecting the indoor and outdoor units.
The indoor unit absorbs heat in a certain interior, and the outdoor unit radiates heat, which corresponds to a sum of heat absorbed in the interior and heat that a compressor radiates to refrigerant, to the outside.
As shown in
FIG. 1
, the outdoor unit of the conventional separation type air conditioner includes an axial flow fan
1
for sucking an indoor air, generating a certain flow of air used for a heat exchange by the outdoor unit and discharging air, a motor
3
for providing a driving force to the axial flow fan
1
, a compressor
5
for compressing a low temperature and pressure vapor state refrigerant flown from the indoor unit and changing the same into a high temperature and pressure vapor state refrigerant, an outdoor heat exchanger
7
for exchanging heat between the high temperature and pressure vapor state refrigerant and the air sucked by the axial flow fan
1
for thereby condensing the same into an ambient temperature and high pressure liquid state refrigerant, an accumulator
8
installed at a suction portion of the compressor
5
for removing an impurity of the refrigerant and preventing the liquid state refrigerant from being flown into the compressor
5
, and a casing
10
for receiving the above-described elements therein.
The casing
10
includes a front panel
11
for forming a front surface of the outdoor unit, and a rear panel
13
for forming both side surface and a rear surface. The rear panel
13
includes a suction port
13
a
for sucking an external air into the interior of the casing
10
, and the front panel
11
includes a discharge port
11
a
for discharging the inner air of the casing
10
to the outside.
In addition, a protection grille
12
is installed at a portion of the discharge port
11
a for preventing an access of the axial flow fan
1
which is rotated at a high speed.
In the drawings, reference numeral
4
presents a shroud
4
which guides the flow of air discharged from the discharge port
11
a
of the front panel
11
by the axial flow fan
1
, and reference numeral
6
represents a noise absorbing material which surrounds the compressor
5
for decreasing noises of the compressor
5
.
The operation of the above-described outdoor unit will be explained.
When the refrigerant gas compressed by the compressor
5
is supplied to the outdoor heat exchanger
7
, a heat exchange is performed between the supplied refrigerant and the air sucked into the interior of the casing
10
by the rotation of the axial flow fan
1
for thereby condensing the refrigerant into an ambient temperature and high pressure state refrigerant, and the temperature of the thusly sucked air is increased.
The air having the thusly increased temperature is discharged to the outside by the axial flow fan
1
.
Namely, the air sucked into the interior of the casing
10
through the suction port
13
a
of the rear panel
13
of the outdoor heat exchanger
7
is discharged to the outside through the axial flow fan
1
and the discharge port
11
a
of the front panel
11
.
When the compressor
5
compresses the refrigerant, the refrigerant circulates through the indoor/outdoor space connection refrigerant pipe which connects the indoor unit and the outdoor unit, so that the refrigerant is flown into the heat exchanger
7
. At this time, as the axial flow fan
1
is rotated by the driving operation of the motor
3
, the air is sucked through the suction port
13
a
, and a certain air flux is formed in the air discharged through the discharge port
11
a
. The thusly formed flux air contacts with the outdoor heat exchanger
7
, so that the refrigerant is condensed.
The refrigerant condensed by the outdoor heat exchanger
7
is adiabatically expanded by an expander(not shown) and is supplied to the indoor unit(not shown) through the indoor/outdoor space connection refrigerant pipe(not shown).
The refrigerant supplied to the indoor unit is heat-exchanged with the air sucked by an indoor fan(not shown) in an indoor heat exchanger(not shown) and is changed into a low temperature and pressure vapor state refrigerant. At this time, the air passed through the indoor heat exchanger has a temperature dropped by a heat exchanger with the refrigerant and is flown into the indoor space for thereby implementing a cooling operation.
Continuously, the refrigerant which is changed to a low temperature and pressure vapor state by the indoor heat exchanger of the indoor unit is moved to the compressor
5
through the indoor/outdoor space connection refrigerant pipe. The above-described operation is repeatedly performed.
In detail, the refrigerant which is heat-exchanged in the indoor unit flows through the indoor/outdoor space connection refrigerant pipe and a service valve mount
14
installed at a portion of the outdoor unit and is introduced into the compressor
5
through the accumulator
8
installed for removing a certain impurity and preventing an introduction of the liquid state refrigerant.
As described above, in the operation of the outdoor unit of the air conditioner, the axial flow fan
1
which generates a certain flux in air is important.
Namely, the axial flow fan
1
is designed so that a certain air flowing amount which is required for enhancing a heat exchanging efficiency between the refrigerant and air is obtained.
In addition, in order to satisfy the need of a customer, the axial flow fan
1
must consume a small amount of electric power. The air flowing noises must be decreased.
In order to manufacture a fan which satisfies the above-described conditions, an intensive study has been conducted for changing the shape of the fan by changing various fan design factors.
There are various fan design factors which determine the shape of the fan. In addition, the effects that the above-described design factors affect the performance of the fan are complicated and various.
As shown in
FIGS. 2
,
4
and
5
, as the fan design factors which may affect the shape of the axial flow fan
1
, there are a diameter (2×Rt) of an axial flow fan, a diameter (2×Rh) of a blade hub, the number and an external dimension of blades
2
, a pitch angle &phgr; with respect to each blade
2
, a maximum chamber (Cmax), a sweep angle &thgr;, a chord length (
1
), a rake, etc. In addition, there are a leading edge LE of a blade, a trailing edge TE, and a curvature shap
Chin Sim Won
Kim Wan Soo
Moon Dong Soo
Park Seung Chul
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Look Edward K.
Nguyen Ninh
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