Siroco fan of a window type air conditioner

Details Siroco fan of a window type air conditioner Siroco fan of a window type air conditioner

2001-05-15

2002-10-08

Lopez, F. Daniel (Department: 2745)

Rotary kinetic fluid motors or pumps

With means for re-entry of working fluid to blade set

Cross flow runner

C416S185000, C416S22300B, C416SDIG002

Reexamination Certificate

active

06461103

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a siroco fan, and more particularly to a siroco fan employed in a window type air conditioner, which does not increase the noise of operation while maintaining the quantity of the blowing air, even when the rotational speed of the siroco fan is increased.
2. Description of the Related Art
In general, a window type air conditioner has a casing
10
, which contains a compressor
12
for compressing refrigerant, a condenser
14
for condensing the refrigerant compressed by the compressor
12
to lower the temperature of the refrigerant, and an evaporator
16
for performing a heat exchange operation by means of the refrigerant cooled by the condenser
14
.
The interior of the window type air conditioner is divided into an indoor section and an outdoor section by a partitioning panel
18
. In the indoor section are disposed the evaporator
16
and a siroco fan
20
for circulating indoor air through the siroco fan
20
, while in the outdoor section are disposed the compressor
12
, the condenser
14
, and an axial-flow fan
30
for cooling the condenser
14
by means of outdoor air.
The siroco fan
20
is disposed behind a bell mouth
11
in the casing
10
. The siroco fan
20
includes a shroud
21
and a plurality of blades
22
disposed at the shroud
21
which are spaced apart at regular intervals, as shown in FIG.
2
. In order to reduce the dimension and manufacturing cost of the air conditioner, the siroco fan
20
and the axial-flow fan
30
are disposed in such a manner as to be operated together by a single driving motor
40
. In this case, a rotation shaft
41
of the driving motor
40
has opposite ends assembled with the siroco fan
20
and the axial-flow fan
30
, respectively.
In the window-type air conditioner as described above, warm indoor air is cooled while being introduced through the evaporator
16
and the bell mouth
11
in the casing
10
. The introduced air is compressed by the blades
22
of the siroco fan
20
and then discharged out of the casing
10
, so that the indoor air is properly cooled or air-conditioned. In this case, the refrigerant warmed after exchanging heat with the warm air at the evaporator
16
is cooled by outdoor air introduced into the outdoor section by means of the operation of the axial-flow fan
30
, while passing through the condenser
14
. The refrigerant is then circulated while performing its heat-exchange operation.
The blowing characteristic of the siroco fan
20
is influenced by such features as the number of blades
22
, the blade span B, the inner diameter d
1
of the siroco fan
20
, which is the distance between the opposing inner ends of the blades
22
, and the outer diameter d
2
of the siroco fan
20
, which is the distance between the opposing outer ends of the blades
22
.
The number of the blades
22
is determined by the ratio between the chord L
1
, which is the distance between the inner end and the outer end of each blade
22
, and the pitch L
2
, which is the distance between the adjacent two outer ends of the blades
22
, as shown in
FIG. 3
a.
Furthermore, the blowing characteristic of the siroco fan
20
is also influenced by the shape of the blades
22
, which is determined in consideration of the leading edge angle &bgr;, the trailing edge angle &agr;, the blade thickness T, and the largest camber position P, as shown in
FIG. 3
b.
The trailing edge angle &agr; is a factor causing an increase in the static pressure, and the fan can perform superior blowing capability when the trailing edge angel &agr; is in a range between 145° and 165°.
In the meantime, the axial-flow fan
30
has a smaller quantity of blowing air in comparison with the siroco fan
20
, based on the same motor output. Accordingly, in the case where the siroco fan
20
in the indoor section rotates together with the axial-flow fan
30
in the outdoor section by utilizing a single driving motor outputs of the siroco fan and the axial flow fan will be different. In consideration of the above difference in the quantity of blowing air from the respective fans, the rotational speed of the driving motor
40
should be set above a predetermined reference, so that the axial-flow fan
30
having the smaller blowing capability can perform the necessary blowing capability.
Accordingly, in the window type air conditioner containing a conventional siroco fan as described above, since the rotating speed of the siroco fan is very high, the quantity of the indoor air blown by the siroco fan exceeds the cooling capability of the evaporator, making the operation of the air conditioner ineffective and inefficient
In the prior art, in order to overcome the above problem of ineffective operation of the air conditioner, the outer diameter d
2
of the siroco fan
20
between the opposed outer ends of the blades
22
is reduced, or the blade span B is reduced.
However, according to these two ways of either reducing the outer diameter or the blade span, although the quantity of the blowing air is reduced, the modified construction of the blade
22
generates increased noise, thereby causing a deterioration in the marketability of the air conditioner.
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 it is an object of the present invention to provide a siroco fan in a window-type air conditioner which does not increase the noise of operation while maintaning the quantity of the blowing air, even when the rotational speed of the siroco fan is increased.
In accordance with one aspect of the present invention, there is provided a siroco fan for a window-type air conditioner, the siroco fan comprising a shroud and a plurality of blades disposed at the shroud and spaced apart in regular intervals, wherein each of the blades has a trailing edge angle of 125° to 137°, a leading edge angle of 58° to 63°, a chord-to-pitch ratio of 0.75 to 0.85, an inner diameter-to-outer diameter ratio of 0.82 to 0.86, and a maximum camber position of 0.3 to 0.4 of a chord length of the blade. Preferably, the siroco fan has forty to fifty blades.


REFERENCES:
patent: 3394876 (1968-07-01), Eck
patent: 4165950 (1979-08-01), Masai et al.
patent: 4900228 (1990-02-01), Yapp
patent: 4915583 (1990-04-01), Vera et al.
patent: 5586053 (1996-12-01), Park
patent: 6287078 (2001-09-01), Min et al.

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