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.
Figure 1 is a sectional view showing an electrodeless lighting system
having a fan with a dust-proof apparatus.
As shown in Figure 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.
Figure 2 is an enlarged sectional view of Figure 1.
As shown in Figure 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.
Figure 3 is a vertical-sectional view of a different fan having a dust-proof
apparatus, and Figure 4 is a plan view of the fan having a dust-proof apparatus of
Figure 3.
As shown in Figures 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 member 230 is not firm with the rotational shaft 221.
In addition, an eccentricity is generated between the propeller 220 and the
cylindrical dust-proof member 230 coupled to the rotational shaft 221 of the
propeller 220 due to an unbalance according to a roundness and assembly
precision. Thus, a noise is generated due to the eccentric rotation of the cylindrical
dust-proof member, and the coupling state of the dust-proof member would not
last long and the coupling is disassembled.
Moreover, since a fixing member 210 is to be additionally installed at an
outer side of the ventilation duct (D) to install a bearing that is rotatably supported
by the rotational shaft, its structure becomes complicated.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a fan having a
dust-proof apparatus that is capable of minimizing a noise generation and
ensuring a firm coupling state as well as preventing insects or dusts from being
introduced according to an air flowing owing to a rotation of a plurality of blades
constituting a fan.
To achieve these and other advantages and in accordance with the
purpose of the present invention, as embodied and broadly described herein,
there is provided a fan having a dust-proof apparatus including: a casing having a
passage; a rotation driving unit installed inside the casing; a plurality of blades
positioned in the passage and coupled to a rotational shaft of the rotation driving
unit so as to be rotated; and a dust-proof member installed at an entrance of the
passage to cover the entrance of the passage, and integrally coupled to the
blades so as to be rotated together with the blades.
To achieve the above objects, there is also provided a fan having a dust-
proof apparatus including: a casing having an entrance and a passage; a rotation
driving unit installed inside the casing; a plurality of blades positioned in the
passage and coupled to a rotational shaft of the rotation driving unit so as to be
rotated; and a dust-proof member installed at an entrance of the passage to cover
the entrance of the passage, and coupled to the rotational shaft so as to be rotated
together with the blades, wherein an outer circumferential surface of the dust-proof
is supported by the entrance so that the dust-proof member is rotatable.
To achieve the above objects, there is also provided a fan having a dust-
proof apparatus for an electrodeless lighting system including a casing; a
microwave generator mounted inside the casing and generating microwave; a
wave guide for guiding the microwave generated from the microwave generator
and serving as a first resonator; a second resonator installed outside the casing so
as to communicate with the waveguide, and exciting the microwave guided
through the waveguide to generate a strong electric field; and an electrodeless
lamp mounted inside the second resonator and forming plasma as gas filed inside
there is excited by the strong electric field of the second resonator, to thereby
generate light, wherein the fan having a dust-proof apparatus includes a passage
formed at the casing to suck an external air to cool the electrodeless lighting
system; a rotation driving unit installed inside the casing; a plurality of blades
installed in the passage and coupled to a rotational shaft of the rotation driving unit
so as to be rotated; and a dust-proof member installed at an entrance of the
passage to cover the entrance of the passage, and integrally coupled to the
blades to be rotated together with the blades.
The foregoing and other objects, features, aspects and advantages of the
present invention will become more apparent from the following detailed
description of the present invention when taken in conjunction with the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and constitute a part of this
specification, illustrate embodiments of the invention and together with the
description serve to explain the principles of the invention.
In the drawings:
Figure 1 is a sectional view of an electrodeless lighting system including a
fan having a dust-proof apparatus in accordance with a conventional art;
Figure 2 is an enlarged sectional view of the electrodeless lighting system
of Figure 1 in accordance with the conventional art;
Figure 3 is a vertical-sectional view of a fan having a different dust-proof
apparatus in accordance with a different conventional art;
Figure 4 is a plan view of the fan of Figure 3 in accordance with the
different conventional art;
Figure 5 is a sectional view of a fan having a dust-proof apparatus in
accordance with a first embodiment of the present invention;
Figure 6 is a plan view of the fan of Figure 5 in accordance with the first
embodiment of the present invention;
Figure 7 is a sectional view of a fan having a dust-proof apparatus in
accordance with a second embodiment of the present invention;
Figure 8 is a plan view of the fan of Figure 7 in accordance with the
second embodiment of the present invention;
Figures 9A and 9B show modifications of the fan having a dust-proof
apparatus of Figures 5 and 7 in accordance with the present invention;
Figures 10A, 10B, 10C and 10D show modifications of dust-proof in
accordance with the present invention; and
Figure 11 is a sectional view of an electrodeless lighting system having a
fan provided with a dust-proof apparatus in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reference will now be made in detail to the preferred embodiments of the
present invention, examples of which are illustrated in the accompanying drawings.
Figure 5 is a sectional view of a fan having a dust-proof apparatus in
accordance with a first embodiment of the present invention, and Figure 6 is a
plan view of the fan of Figure 5 in accordance with the first embodiment of the
present invention.
As shown in Figures 5 and 6, a fan having a dust-proof apparatus in
accordance with a first embodiment of the present invention includes a casing 400
having a passage (F), a rotation driving unit (M) installed inside the casing 400, a
blades 412 positioned in the passage (F) and coupled to a rotational shaft 411 of
the rotation driving unit (M) so as to be rotated, and a dust-proof member 430
installed at an entrance 420 of the passage (F) to cover the entrance (420) of the
passage (F), and integrally coupled to the blades 412 so as to be rotated together
with the blades 412.
The blades 412 are coupled at one side of a hub 413 connected to the
rotational shaft 411.
The dust-proof member 430 includes a mesh portion 431 in a disk type
having a size corresponding to the size of the entrance 420 of the passage (F),
and an outer circumferential portion 432 extended and bent from a marginal
portion of the mesh portion 431 and fixed at an end portion of the blades 412.
When the outer circumferential portion 432 of the dust-proof member 430
is fixedly coupled at the end portion of the blades 412, they can be engaged by
using an additional engaging unit, which are a screw or bolt and nut.
In the fan having the dust-proof apparatus in accordance with the first
embodiment of the present invention, since the dust-proof member 430 is fixedly
coupled at the blades 412, that is, fixedly coupled at the margin of the blades 412,
the dust-proof member 430 is rotated together with the blades 412. Thus, an
eccentricity can be minimized, and as the contact area is wide, the coupling state
is firm.
The operation of the fan having the dust-proof apparatus in accordance
with the first embodiment of the present invention will now be described.
First, when the rotation driving unit (M) is rotated as a power is applied
thereto, the driving force of the rotation driving unit (M) is transferred to the blades
412 connected to the rotational shaft 411, so that the blades 412 are rotated.
As the blades 412 are rotated, the dust-proof member 430 integrally
coupled to the blades 412 are accordingly rotated.
According to the rotation of the blades 412, an external air is introduced
through the entrance 420 and flows through the passage (F) formed inside the
casing 400, that is, the passage (F) perpendicular to the entrance 420, and at this
time, since the dust-proof member 420 is also rotated, insects or big dusts
introduced into the entrance according to the air flowing collide with the dust-proof
member 430 and slip out off therefrom, they are prevented from being introduced
into the passage (F).
Figure 7 is a sectional view of a fan having a dust-proof apparatus in
accordance with a second embodiment of the present invention, and Figure 8 is a
plan view of the fan of Figure 7 in accordance with the second embodiment of the
present invention.
As shown in Figures 7 and 8, a fan having a dust-proof apparatus in
accordance with a second embodiment of the present invention includes: a casing
500 having an entrance 520 and a passage (F), a rotation driving unit (M) installed
inside the casing 500, a plurality of blades 512 positioned in the passage (F) and
coupled at a rotational shaft 511 of the rotation driving unit (M) so as to be rotated,
and a dust-proof member 530 installed at an entrance 520 of the passage (F) to
cover the entrance 520 of the passage (F), and being rotated together with the
blades 512.
The blades 512 are coupled at an outer circumference of a hub 513
connected to the rotational shaft 512.
The dust-proof member 530 includes a mesh portion 531 in a disk type
having a size corresponding to the size of the entrance 520 of the passage (F),
and an outer circumferential portion 532 extended and bent from the marginal
portion of the disk type mesh portion 531.
A coupling portion 533 is formed at a central portion of the disk type mesh
portion 531. The coupling portion 533 is inserted to be fixed at the end of the hub.
In case of coupling the coupling portion 533 of the dust-proof member 530
to the end of the hub 513, an additional engaging unit, that is, a screw or a bolt
and nut can be used to engage them.
The operation of the fan having a dust-proof apparatus in accordance with
the second embodiment of the present invention will now be described.
First, when the rotation driving unit (M) is driven as a power is applied to
the rotation driving unit (M), the driving force of the rotation driving unit (M) is
transferred to the hub 513 connected to the rotational shaft 511, so that the blades
512 coupled to the hub 513 are also rotated.
As the blades 512 are rotated, the dust-proof member 530 coupled to the
hub 513 is accordingly rotated.
According to the rotation of the blades 512, an external air is introduced
through the entrance 520 and flows through the passage (F) formed inside the
casing 500, and at this time, since the dust-proof member 520 is also rotated,
insects or big dusts introduced into the entrance according to the air flowing collide
with the dust-proof member 530 and slip out off therefrom, they are prevented
from being introduced into the passage (F).
In the fan having the dust-proof apparatus, the mesh portion of the dust-
proof member has almost the same size as that of the entrance, and the outer
circumferential portion of the dust-proof member can be rotatably supported by the
casing according to a separate structure so that the dust-proof member can be
smoothly rotated.
Figures 9A and 9B show modifications of the fan having a dust-proof
apparatus of Figures 5 and 7 in accordance with the present invention.
Referring to the fan having the dust-proof apparatus in accordance with
the first and the second embodiments of the present invention, an annular recess
601 can be formed at an entrance 620 of the passage so as to receive the outer
circumferential portion 632 of the dust-proof member 630.
Preferably, a bearing is installed in the recess 601 or between the recess
and the dust-proof member 630, so that the dust-proof member can be smoothly
rotated without being shaken.
If the annular recess 610 is formed and the outer circumferential portion
632 of the dust-proof member 630 is coupled thereto, when insects or big dusts
comes off to the outer circumferential portion 632 of the dust-proof member 630
according to the rotation of the dust-proof member 630, they are bound to fly
toward the outer wall of the casing 600. Thus, the fan can be more effectively
protected against insects or big dusts.
With respect to the fan having a dust-proof apparatus in accordance with
the first and the second embodiments of the present invention, as shown in Figure
9B, a bearing member 702 may be formed between an outer circumferential
portion 732 of a dust-proof member 730 and an inner circumferential surface of an
entrance 720, so as to prevent a friction or abrasion between the outer
circumferential portion of the dust-proof apparatus and the internal surface of the
entrance.
In the fan having a dust-proof apparatus in accordance with the present
invention, in order to accomplish a better dust-proof effect, the mesh portion of the
dust-proof member can be variably modified in its form.
Figures 10A, 10B, 10C and 10D show modifications of dust-proof in
accordance with the present invention.
With respect to the fan having the dust-proof apparatus in accordance with
the first and the second embodiments of the present invention, as shown in Figure
10A, a mesh portion 831a of a dust-proof member 830a includes a blocking
portion 833a formed at a central portion thereof to prevent passing of a fluid such
as air.
When the dust-proof member 830a is rotated, a centrifugal force is not
strong at the central portion. Thus, by forming the blocking portion 833a at the
central portion, a dust-proof effect can be heightened.
In addition, since the mass of the dust-proof member 830a is concentrated
to the center due to the blocking portion 833a, the dust-proof member 830a can be
more stably rotated, and the hub can be extended to be fixedly coupled along with
the blocking portion 833a.
In the fan having the dust-proof apparatus in accordance with the first and
the second embodiments of the present invention, as shown in Figure 10B, a
mesh portion 831b of the dust-proof member 830b may have a plurality of
protrusions 843b formed at a surface thereof.
The plurality of protrusions 834b formed at the surface of the mesh portion
830b can more effectively collide with insects or big dusts when the dust-proof
member 830b is rotated, thereby heightening a dust-proof effect.
With reference to Figure 10C, a mesh portion 831c of a dust-proof
member 830c may have a wave form in its section in a circumferential direction.
Thanks to the wave form structure formed on the surface of the mesh
portion 831c, insects or big dusts can effectively collide therewith when the dust-
proof member 830c is rotated, thereby heightening a dust-proof effect.
With reference to Figure 10D, a mesh portion 831d of a dust-proof
member 830d may have a concave surface, not a plane surface, toward an outer
side of the casing.
Figure 11 is a sectional view of an electrodeless lighting system having a
fan provided with a dust-proof apparatus in accordance with the present invention.
The fan having the dust-proof apparatus in accordance with the present
invention can be employed to an electrodeless lighting system as shown in Figure
11.
That is, as shown in Figure 11, a high voltage generator 20 for generating
a high voltage is mounted inside the casing 10, and a microwave generator 30 for
receiving the high voltage generated from the high voltage generator 20 and
generating a microwave is mounted at the inner side of the casing 10 with a
certain space from the high voltage generator 20.
A wave guide 40 for guiding the microwave generated from the microwave
generator 30 and serving as a vacuum is mounted between the microwave
generator 30 and the high voltage generator 20.
An electrodeless lamp 60 is coupled to be protruded outwardly of the
casing 10 so as for the resonator 50 for exciting the microwave transmitted to the
waveguide 40 and generating a strong electric field to communicate with the
waveguide 40. The electrodeless lamp 60 filled with a substance forming plasma
is positioned inside the resonator 50.
A lamp driving motor 90 for rotating the electrodeless lamp 60 and a
connection shaft 91 for connecting the lamp driving motor 90 and the
electrodeless lamp 60 are provided inside the casing 10.
A passage 11 for guiding air introduced from outside toward the high
voltage generator 20 and the microwave generator 30 is provided at one side of
the casing 10, and a fan driving motor 110 for generating an air flowing is mounted
at the passage 11.
A fan 900 is positioned at an air entrance 12 of the passage 11 and
coupled to the fan driving motor 110.
And a dust-proof member 140 having a certain shape is fixedly coupled to
the fan 900.
As the fan 900, the fan having a dust-proof apparatus in accordance with
the present invention is used.
Especially, if the electrodeless lighting system is installed outside, flying
life, that is, a moth, a mosquito gathering to the lighting system or big foreign
substances are bound to come off after colliding with the dust-proof member 140
being rotated and provided in the fan 900 in the process that they are being
introduced to the air entrance 12 according to air flowing, so that they are
prevented from being introduced into the passage 11 and parts can be prevented
from damaging due to the foreign substances.
In addition, since the dust-proof member 140 is fixed to the fan 900, when
the fan 900 is rotated, the dust-proof member 140 is also rotated together with the
van 900. Thus, an eccentricity can be minimized, and since the contact area is
wide, the coupling state is ensured firm.
As so far described, the fan having the dust-proof apparatus in
accordance with the present invention has many advantages.
That is, for example, since insects or big dusts can be prevented from
being introduced according to an air flowing generated as the blades are rotated,
and the coupling state between parts is firm. In addition, since the eccentricity is
minimized, the parts are not damaged, and as a noise generation is restrained, so
that reliability can be heightened.
In addition, the fan having the dust-proof apparatus of the present
invention can be adopted to an air-conditioner, a microwave oven or a computer to
prevent a foreign substance from being introduced thereinto.
That is, in case of the air-conditioner, the fan having the dust-proof
apparatus of the present invention can be provided in outer equipment and inner
equipment constituting the air-conditioner, so as to prevent a foreign substance
from being introduced to the inside. In case of the computer, the fan having the
dust-proof apparatus of the present invention can be adopted to cool the CPU of
the computer, so as to prevent a foreign substance from being introduced into the
computer.
As the present invention may be embodied in several forms without
departing from the spirit or essential characteristics thereof, it should also be
understood that the above-described embodiments are not limited by any of the
details of the foregoing description, unless otherwise specified, but rather should
be construed broadly within its spirit and scope as defined in the appended claims,
and therefore all changes and modifications that fall within the meets and bounds
of the claims, or equivalence of such meets and bounds are therefore intended to
be embraced by the appended claims.
WE CLAIM:
1. A fan having a dust-proof apparatus comprising:
a casing having a passage;
a rotation driving unit positioned inside the casing;
a plurality of blades positioned in the passage and coupled to a rotational
shaft of the rotation driving as to be rotated; and
a dust-proof member installed at an entrance of the passage, and
integrally coupled to the blades so as to be rotated together with the blades for
preventing insects or dust from entering into the casing.
2. The fan as claimed in claim 1, wherein the dust-proof member has a
blocking portion formed at a central portion thereof to block passing of a fluid.
3. The fan to claim 1, wherein a plurality of protrusions are formed at
the surface of the dust-proof member.
4. The fan to claim 1, wherein a wave form is formed in a
circumferential direction at the surface of the dust-proof member.
5. The fan to claim 1, wherein the dust-proof member has a
cylindrical form.
6. A fan having a dust-proof apparatus comprising:
a casing having an entrance and a passage;
a rotation driving unit positioned inside the casing;
a plurality of blades positioned in the passage and coupled to a rotational
shaft of the rotation driving unit to be rotated; and
a dust-proof member installed at an entrance of the passage, and coupled
to the rotational shaft so as to be rotated together with the blades for preventing
insects or dust from entering into the casing,
wherein an outer circumferential surface of the dust-proof member is
supported by the entrance that the dust-proof member is rotatable.
7. The fan claim 6, wherein the dust-proof member includes a
blocking portion formed at a central portion thereof to block passing of fluid.
8. The fan claim 6, wherein a plurality of protrusions are formed at
the surface of the dust-proof member.
9. The fan claim 6, wherein a section of the dust-proof member
sectioned in a circumferential direction has wavelike-shape.
10. The fan claim 6, wherein the dust-proof member has a
cylindrical form.
11. The fan claim 6, wherein the casing is formed with an annular
recess at a circumferential surface of the entrance, into which the outer
circumfernetial portion of the dust-proof member is inserted so as to be rotatably
supported.
12. A fan having a dust-proof apparatus of an electrodeless lighting
system comprising:
a casing;
a microwave generator mounted inside the casing and generating
microwave;
a wave guide for guiding the microwave generated from the microwave
generator and serving as a first resonator;
a second resonator installed outside the casing so as to communicate with
the waveguide, and exciting the microwave guided through the waveguide to
generate a strong electric field; and
an electrodeless lamp mounted inside the second resonator and forming
plasma as gas filed inside there is excited by the strong electric field of the second
resonator, to thereby generate light,
wherein the fan having a dust-proof apparatus comprises:
a passage formed at the casing to suck an external air to cool the
electrodeless lighting system;
a rotation driving unit installed inside the casing;
a plurality of blades installed in the passage and coupled to a rotational
[shaft of the rotation driving unit so as to be rotated; and
a dust-proof member installed at an entrance of the passage, and
integrally coupled to the blades to be rotated together with the blade for preventing
insects or dust from entering into the casing.
13. A fan having a dust-proof apparatus, substantially
as herein described, particularly with reference to the
accompanying drawings.

A fan having a dust-proof apparatus includes: a casing having a passage;
a rotation driving unit installed inside the casing; a plurality of blades positioned in
the passage and coupled to a rotational shaft of the rotation driving unit so as to
be rotated; and a dust-proof member installed at an entrance of the passage to
cover the entrance of the passage, and integrally coupled to the blades so as to
be rotated together with the blades. Since insects or big dusts can be prevented
from being introduced according to an air flowing generated as the blades are
rotated, and the coupling state between parts is firm. In addition, since the
eccentricity is minimized, the parts are not damaged, and as a noise generation is
restrained, so that reliability can be heightened.