Electric lamp and discharge devices – Fluent material supply or flow directing means – Plasma
Reexamination Certificate
2002-04-11
2004-07-20
Clinger, James (Department: 2821)
Electric lamp and discharge devices
Fluent material supply or flow directing means
Plasma
C315S248000
Reexamination Certificate
active
06765341
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fan, and more particularly, to a fan having a dust-proof apparatus installed at a suction hole thereof that is capable of preventing insects or dust from being introduced together with air.
2. Description of the Background Art
A fan generating fluid flow such as air flow typically includes a casing having an air flow passage; a drive motor mounted inside the casing and generating a rotational force; and a plurality of blades rotatably installed in the air flow passage of the casing and being rotated upon receipt of a driving force of the drive motor.
In the fan, when the drive motor is operated as a power is applied thereto, the blades are rotated according to the drive motor.
When the blades are rotated, a pressure difference is generated due to the rotation of the blades, and thanks to the pressure difference, air flows along the air flow passage.
The fan is classified into an axial flow fan, a centrifugal fan and a sirocco fan according to air flow passage form.
In case of the axial flow fan, air flow forms a linear flow as air is introduced from a front side and flows to a back side. Meanwhile, in case of the centrifugal fan or the sirocco fan, it forms a curved flow as air is introduced from the front side and flows out to the side.
A fan is used in various fields where the air flowing is required, and an electrodeless lighting system employs it to cool devices installed therein by sucking air from outside.
FIG. 1
is a sectional view showing an electrodeless lighting system having a fan with a dust-proof apparatus.
As shown in
FIG. 1
, the electrodeless lighting system having a fan with a dust-proof apparatus includes: a casing
10
; a high voltage generator
20
mounted at an inner front surface of the casing
10
and generating a high voltage; an microwave generator
30
for generating a microwave with the high voltage generated from the high voltage generator
20
; a wave guide
40
for guiding the microwave generated from the microwave generator
30
and serving as a first resonator; a second resonator
50
installed at a front outer side of the casing
10
, exciting the microwave guided through the waveguide
40
and generating a strong electric field; an electrodeless lamp
60
rotatably mounted inside the second resonator
50
, forming a plasma as a gas filled therein is excited according to the strong electric field of the second resonator
50
, to thereby generate a light; a first mirror
70
positioned at a rear face of the electrodeless lamp
60
and reflecting the light generated from the electrodeless lamp
60
to the front surface; and a second mirror
80
for collecting the light generated from the first mirror
70
and the electrodeless lamp
60
and reflecting it to the front side.
The casing
10
includes a lamp driving motor
90
for rotating the electrodeless lamp
60
to cool the electrodeless lamp
60
and a connection shaft
91
for connecting the lamp driving motor
90
and the electrodeless lamp
60
.
At one side of the casing
10
, a passage
11
is installed allowing air to flow toward the microwave generator
30
and the high voltage generator
20
. An entrance
12
is formed at one side of the passage
11
, into which an external air is introduced, and a fan
100
is mounted at the inner side of the entrance
12
.
The fan
100
includes a plurality of blades
101
for generating air flowing by rotation and a fan driving motor
110
for rotating the blades
101
.
The operation of the electrodeless lighting system will now be described.
First, when a power is applied to the high voltage generator
20
, the high voltage generator
20
generates a high voltage, and the microwave generator
30
generates microwave according to the high voltage generated from the high voltage generator
20
.
The microwave generated from the microwave generator
30
is transferred to the second resonator
50
through the wave guide
40
, so that a strong electric field is distributed at the second resonator
50
, and according to the strong electric field, the substance filled in the electrodeless lamp
60
is discharged, and at the same time, vaporized to generate plasma.
The light emitted as the plasma is generated from the electrodeless lamp
60
is reflected by the first mirror
70
and the second mirror
80
and illuminated forwardly.
At this time, much heat is generated from the high voltage generator
20
and the microwave generator
30
.
The intense heat generated from the electrodeless lamp
60
is cooled by rotating the electrodeless lamp
60
by the lamp driving motor
90
.
When the blades
101
are rotated as the fan driving motor
110
is operated, an external air is introduced through the entrance
12
due to the pressure difference according to the rotation of the blades
101
.
The external air introduced into the entrance
12
is guided through the passage
11
and flows while passing the high voltage generator
20
and the microwave generator
30
to cool the high voltage generator
20
and the microwave generator
30
.
Meanwhile, in the process that the conventional fan
100
having the dust-proof apparatus mounted at the electrodeless lighting system is operated, insects such as a day-fly, mosquito and a moth gather, and the gathered insects and dust are introduced into the passage
11
together with the external air due to the suction force of the fan
100
to be compressed to the fan
100
or attached to a part inside the casing
10
, interfering the rotation of the fan
100
or damage the internal parts.
In order to solve the problems, a dust-proof is provided at the side of the entrance
12
where the external air is introduced.
FIG. 2
is an enlarged sectional view of FIG.
1
.
As shown in
FIG. 2
, the dust-proof apparatus of the fan includes a dust-proof member
120
, and a screw
130
for engaging the marginal portion of the dust-proof member
120
to the casing
10
so as for the dust-proof member
102
to be fixed.
Though insects or dusts are restrained from being sucked into the casing
10
as they are caught by the dust-proof member
120
in the process that external air is being introduced due to the pressure difference according to the rotation of the blades
101
, the conventional fan having the dust-proof apparatus is disadvantages in that insects or dusts are collected at the surface of the dust-proof member
120
, causing a reduction of air flowing and increase in an air suction resistance.
FIG. 3
is a vertical-sectional view of a different fan having a dust-proof apparatus, and
FIG. 4
is a plan view of the fan having a dust-proof apparatus of FIG.
3
.
As shown in
FIGS. 3 and 4
, Japanese Laid Open Publication No. JP2000161734 discloses another example of the fan having a dust-proof apparatus, in which a guide duct
200
is insertedly fixed at an outdoor opening of a ventilation duct (D), a fixing member
210
having a bearing
211
is insertedly combined inside the guide duct
200
, and a propeller
220
rotated by wind is rotatably coupled at the bearing
211
of the fixing member
210
.
The cylindrical dust-proof member
230
is fixedly coupled to a rotational shaft
221
of the propeller
220
to cover the front portion of the propeller
220
, and a fixing member
240
in a “U” shape having a certain thickness and width traverses the cylindrical dust-proof member
230
and fixedly coupled to one side of the guide duct
200
.
In the conventional fan having the dust-proof apparatus having the structure as described above, as the propeller
220
is rotated according to air flowing in the ventilation duct (D), the dust-proof member
230
coupled to the rotational shaft
221
of the propeller
220
is accordingly rotated to thereby prevent insects or dusts from being introduced into the ventilation duct (D) as well as being attached to the dust-proof member
230
.
However, since the cylindrical dust-proof member
230
is fixedly coupled to the rotational shaft
221
of the propeller
220
, the fixing state of the cylindrical dust-proof
LG Electronics Inc.
Ostrolenk Faber Gerb & Soffen, LLP
Tran Chuc
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