KR20180039985A - Anti-accumulation bagfilter dust collector - Google Patents

Abstract

Provided is a bag filter dust filtering and collecting device capable of solving problems of difficult collection since dust is accumulated on the inner wall of the device. The bag filter dust filtering and collecting device uses a bag filter for discharging collected dust to the outside after collecting dust or the like supplied from polluted air. The bag filter dust filtering and collecting device according to the present invention includes: an upright container upper case which has a plurality of bag filters for filtering dust installed in a vertical direction; a lower case which is formed in the lower end of the upper case, collects dust falling from the bag filter, and has an area becoming smaller towards the lower part; and two or more air supply pipes which supply polluted air to the inside of the bag filter dust filtering and collecting device by penetrating the lower case. An air flow between the two or more air supply pipes rotates along the inner circumference of the lower case and a central space between the two or more air supply pipes has an area where dust can fall down by installing the air supply pipes to cross mutually in both facing sides of the lower case and forming a lateral discharge hole in the lateral side of the air supply pipes.

Description

[0001] The present invention relates to an anti-accumulation bag filter dust collector,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filter filtration and dust collecting apparatus used for collecting particulate pollutants such as dusts discharged from various industrial facilities, and more particularly, to a bag filter filtration and dust collecting apparatus for collecting dust, ≪ / RTI >

Usually, fine particles are mixed in the exhaust gas discharged from various industrial facilities. A device such as a cyclone and a bag filter filtration and dust collecting device are used to remove particulate contaminants in the exhaust gas. When the exhaust gas passes through the cyclone, relatively large and heavy dust is recovered, and the small and light dust that can not be collected at this time is filtered by the bag filter filtering dust collector. Bag filter A filter device is a device that filters gases and solids through a filter. Normally, the bag filter can float to a dust size of 0.1 μm.

FIG. 1 and FIG. 2 show a conventional bag filter filtration and dust collecting apparatus, which is called a bag house having a bag filter and a discharging device. Referring to FIGS.

Figure 1 is a top view of the device and Figure 2 is a side view. The dust is collected on the surface of the bag filter 3 while the inflow air containing the dust coming in from the lower inlet 1 of the apparatus passes through the bag filter 3 on the upper side and the dusted air passes through the bag filter 3, And is discharged through the outlet (2).

Such a bag filter filtration and dust collecting device has a high dust collection efficiency. However, since the pressure loss increases due to thickening of the dust layer collected in the filter cloth as the filtration operation progresses, dust on the surface of the bag filter 3 I have to shake it off. The draining operation mainly uses a compressed air discharge device composed of a compression tank 8, a blow pipe 6 and a nozzle 7, and has a strong energy inside the bag filter 3 through the nozzle 7 Compressed air is blown to blow off the dust adhering to the surface of the bag filter (3) to reduce pressure loss. In this case, if the drainage is not good, increase the pressure of the compressed air injected for draining or shorten the spraying time of the compressed air.

The dust on the surface of the bag filter 3 operates at intervals of a predetermined time by such a dust removing operation, falls down, is collected in the dust storage tank 5 through the dust discharging device 4, and is discharged to the outside. However, the dust may adhere to the inner wall of the apparatus while it is falling, and if the dust is continuously accumulated on the inner wall, the outlet may be blocked. In order to solve this problem, an air knocker or a vibrator is usually used. However, when these are used, there is a problem that the dust is removed locally, but the adjacent equipment is damaged due to vibration.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bag filtering and dust collecting apparatus capable of solving the problem that dust is accumulated on the inner wall of the apparatus and is not recovered.

According to an aspect of the present invention, there is provided a bag filter filtration and dust collecting apparatus using a bag filter for collecting dust and the like from polluted air to be supplied to the outside, An upstanding cylindrical upper case having a vertical direction; A lower case formed at a lower end of the upper case and collecting dust falling from the bag filter and having a smaller area as it goes down; And two or more air supply pipes passing through the lower case and supplying polluted air into the bag filter filtering and dust collecting device, wherein the air supply pipes are staggered on opposite sides of the lower case, The air flow between the two or more supply pipes is rotated along the inner circumference of the lower case and the central space between the two or more supply pipes forms a region where the dust can fall .

In the present invention, the air supply pipe may further include an upper slit opening portion to prevent dust from being accumulated on the upper portion of the outer wall of the air supply pipe.

The upper surface slit opening may be formed in a T shape including a slit parallel to the supply pipe extending to the supply pipe end and a slit perpendicularly formed on the upper surface of the supply pipe end.

Wherein a length of a portion of the air supply pipe extending inwardly of the lower case is L and a diameter of the air supply pipe is D, a length of a slit parallel to the air supply pipe is 0.5L to 0.8L The length of the slit perpendicularly formed may be 0.3D to 0.5D.

The air supply pipe may further include a bottom slit opening to prevent dust from falling on the bottom of the inner wall of the air supply pipe.

The slit opening may be a portion opened by 10 to 60 degrees with respect to the center of the air supply pipe.

The length of the lower slit opening may be 0.1L to 0.4L, where L is the length of the portion of the air supply pipe that extends inside the lower case.

The side discharge holes may be in the form of a slit having a constant size up to the end of the supply pipe. The side discharge hole may have a tapered shape with a narrow width toward the end of the supply pipe. The side discharge hole may be a plurality of circular openings whose diameters decrease toward the end of the supply pipe.

The length of the side discharge hole may be 0.5L to 0.8L, where L is the length of the portion of the air supply pipe that extends inside the lower case.

When the length of one surface of the lower case through which the air supply pipe passes is W, the two or more supply pipes may be located at a distance of 0.07 W to 0.15 W from both sides of the lower case.

The length of a side of the air supply pipe which is perpendicular to one surface of the lower case through which the air supply pipe is passed may be 0.15S to 0.25S.

The supply pipe may be formed at a position close to the middle or middle of the upper and lower lengths of the lower case.

And a purge device for removing dust accumulated in the bag filter.

The air supply pipe may direct the air jet toward the inner side wall of the upper case or the lower case and the injected air may impinge on the side inner wall to cause rotational flow into the apparatus.

According to the present invention, two or more air supply pipes are provided and installed, and the air jet is directed to the side wall of the side of the apparatus and makes a region capable of dropping dust into the central space between the air supply pipes. According to this configuration, air is injected only to the wall surface of the apparatus and is not injected into the falling region between the supply pipes. When the air is sprayed to the side and the dust is allowed to fall in the central space, it is possible to effectively prevent dust from accumulating on the wall of the apparatus.

In the present invention, two supply pipes are staggered to provide the same effect as a cyclone. Not only is dust collected while sweeping the wall, it also creates a fall area in the central space. Dust collection can be effectively improved in a bag filter having a narrow area.

According to the present invention, a strong flow velocity is generated on the side surface, and the wall surface is swept to prevent dust accumulation on the side wall. In addition, the heavy particles descend on the wall surface like a cyclone, and the light particles rise and fall down to the fall area of the central space at the time of dust purging.

According to the present invention, it is possible to efficiently operate the bag filter filtering and dust collecting apparatus without preventing the dust from being accumulated, thereby preventing the adjacent facilities from being damaged or damaged, and the maintenance cost of the apparatus can be greatly reduced. It is possible to prevent dust accumulation only by designing the supply pipe without changing the size of the apparatus, so that the installation cost can be remarkably reduced and the highly efficient dust collection can be performed.

In addition, since it is possible to prevent accumulation in the apparatus, it is unnecessary to increase the pressure or shorten the spraying period in periodic exhausting operation by preventing accumulation of dust on the surface of the bag filter by re-scattering of the accumulated dust, It is possible to reduce the maintenance cost of the apparatus.

FIG. 1 and FIG. 2 are schematic views of a bag filtering and dust collecting apparatus of a conventional rectangular shape.
3 is a perspective view of a bag filtering and dust collecting apparatus according to an embodiment of the present invention.
4 is a sectional view taken along the line IV-IV 'of FIG.
5 is a plan view for explaining air injection by an air supply pipe of a bag filter filtration and dust collecting apparatus according to an embodiment of the present invention.
6 is a top view of an air supply pipe that can be included in the bag filtering and dust collecting apparatus according to an embodiment of the present invention.
7 is a cross-sectional view taken along line VII-VII 'of FIG.
8 is a side view of the air supply pipe shown in Fig.
9 to 11 are views for explaining an installation position of an air supply pipe that can be included in the bag filter filtering and dust collecting apparatus according to an embodiment of the present invention.
12 to 14 are views for explaining examples of various side discharge holes of the air supply pipe of the bag filter filtering dust collector according to an embodiment of the present invention.
15 is a plan view of a flow analysis of a bag filtering and dust collecting apparatus according to an embodiment of the present invention.
16 is a three-dimensional flow analysis diagram of a bag filtering and dust collecting apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. The embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention and therefore various equivalents that can be substituted at the time of the present application It should be understood that variations can be made.

FIG. 3 is a perspective view of a bag filtering and dust collecting apparatus according to an embodiment of the present invention, and FIG. 4 is a sectional view taken along line IV-IV 'of FIG. The configuration and operation of the present invention will be described in detail with reference to FIGS. 3 and 4. FIG.

3 and 4, the bag filtering and dust collecting apparatus 100 according to an embodiment of the present invention uses a bag filter 110 for collecting dust and the like from the supplied polluted air and discharging the collected dust to the outside, A lower case 130 for collecting dust falling from the bag filter 110, which is formed at the lower end of the upper case 120 and has a plurality of bag filters 110 for filtering dust, And an air supply pipe 140 passing through the lower case 130 and supplying polluted air into the bag filter filtering and dust collecting apparatus 100.

The lower case 130 may be integrally formed with the upper case 120. The lower case 130 may be formed as a single piece with the upper case 120. [

The supply pipe 140 is preferably formed at a position close to the middle or middle of the upper and lower lengths of the lower case 130. The supply pipe 140 may be formed of a metal pipe, a plastic pipe, or a plastic pipe having a metal layer on at least a part of the surface thereof. It is also possible to provide a modification in which the supply pipe 140 is installed in the upper case 120 instead of being installed in the lower case 130.

In the bag filtering and dust collecting apparatus 100, the inflow air containing the dust coming from the air supply pipe 140 passes through the upper bag filter 110, and the dust is collected on the surface of the bag filter 110, Passes through the bag filter 110 and is discharged through the upper outlet 160.

The bag filter filtration and dust collecting apparatus 100 may further include a purge device 170 for removing accumulated dust accumulated in the bag filter 110. 1 and 2, the purging device 170 may be a scrubbing device composed of a conventional compression tank, a blow pipe, a nozzle, or the like, and may be a brush or the like capable of physical manipulation for effectively removing dust As shown in FIG.

The dust on the surface of the bag filter 110 can be dropped by the purging device 170 at a predetermined time interval and discharged to the outside through the dust discharging device 180. The dust exhausting device 180 may be, for example, a rotary valve or a recovery screw.

Particularly, in the bag filter filtration and dust collecting apparatus 100, the air supply pipe 140 is installed so that two or more air supply pipes 140 are staggered on opposite sides of the lower case 130. Although two supply pipes 140 are provided in the present embodiment, the number of the supply pipes may be three or more.

The supply pipe 140 may have a cylindrical shape with a closed end. A side discharge hole 150 is formed in the side of the air supply pipe 140. The side discharge hole 150 allows the air spray to be directed toward the inner side wall of the upper case 120 or the lower case 130, i.e., the inner wall of the apparatus.

The clogged end of the supply pipe 140 may further include an end discharge hole (not shown) through which contaminated air is sprayed. The end discharge hole may have a slot shape, and the number of end discharge holes is not limited. A slot is a hole or a gap with a certain width. The end discharge hole can also act to remove dust by spraying air in the flow direction. The shape and the number of the end discharge holes are not limited as long as they satisfy the condition that air can be sprayed in the flow direction to remove the dust.

5 is a plan view for explaining air injection by an air supply pipe of a bag filter filtration and dust collecting apparatus according to an embodiment of the present invention.

Referring to FIG. 5, the air supply pipes 140 may be installed on the opposite sides of the lower case 130 on opposite sides thereof, and the air supply directions may be opposite to each other.

One of the air supply pipes 140 is installed to penetrate one surface 130a of the lower case 130 and the other air supply pipe 140 penetrates a surface 130c facing the one surface 130a of the lower case 130 Respectively. And the supply pipes 140 share one axis and are not in a shape facing each other along the axis but are shifted from each other. If the supply direction of the supply pipe 140 passing through the one surface 130a is the left direction from the right side of the drawing, the supply direction of the supply pipe 140 passing through the other surface 130c is the right direction from the left side of the drawing, The directions of supply are opposite to each other.

Referring to FIG. 5, air injection by the air supply pipe 140 is directed to the side wall of the apparatus as described above (solid line arrow). According to this configuration, air is injected only to the wall of the apparatus and is not injected into the central space A between the two or more supply pipes 140.

As shown in detail, when air is injected in a direction indicated by a straight arrow and then strikes the wall of the apparatus, a rotational flow as indicated by a curved arrow occurs, and the air flow between the two or more air supply pipes 140 And the central space A between the two or more supply pipes 140 is formed with a region in which dust can fall.

As described above, when a plurality of air supply pipes are provided and the direction of air injection is changed to form a region where dust can fall in the central space A between the air supply pipes, it is possible to effectively prevent dust from accumulating on the wall of the apparatus.

Particularly, two air supply pipes 140 can be staggered to produce the same effect as a cyclone. Not only is dust collected while sweeping the wall, it also creates a fall area in the central space (A). Dust collection can be effectively improved in a bag filter having a narrow area.

A strong flow velocity is generated on the side, and the wall surface is swept, thereby preventing dust accumulation on the side wall. In addition, the heavy particles descend on the wall surface like a cyclone, the light particles rise, and fall down to the fall area of the central space (A) upon dust purging.

The present invention is capable of dust removal even in air of a low speed region instead of compressed air. It is possible to clean the side wall of the bag filter filtration and dust collecting apparatus 100 by strong air jetting on the side and lower side of the air supply pipe 140. Compared to conventional, air is sprayed in various directions and heavy dust drops along the side wall. The relatively light dust rises and falls into the central space (A) when the nitrogen air is injected when purging the bag filter (110).

FIG. 6 is a top view of an air supply pipe that can be included in the bag filtering and dust collecting apparatus according to the embodiment of the present invention. FIG. 7 is a sectional view taken along the line VII- Side view.

6 to 8, the air supply pipe 140 may further include an upper surface slit opening 154 to prevent dust from accumulating on the outer wall upper portion of the air supply pipe 140. The upper surface slit opening 154 is preferably formed in a narrow and slender slit shape as a concept of removing the position where the dust is to be filled.

The upper slit opening 154 includes a slit 154a extending in parallel to the air supply pipe 140 extending to the end of the air supply pipe 140 and a slit 154b formed in the upper surface of the end portion of the air supply pipe 140 So that it is formed in a T shape.

The length of the portion of the air supply pipe 140 extending inward from the lower case 130 is L and the diameter of the air supply pipe 140 is D, The length l ₁ of the slit 154a in parallel with the slit 140 may be 0.5L to 0.8L and the length l ₂ of the slit 154b formed vertically may be 0.3D to 0.5D. If the length l ₁ of the slit 154a is less than 0.5L, there is a risk of dust accumulation on the upper surface of the air supply pipe 140, and there is no difference in effect even when it is larger than 0.8L. The length of the slit (154b), (l ₂₎ is less than 0.3D because there is no risk of dust on the top of the air supply pipe 140, backlog and large, the effect differs from the 0.5D there is no reason to dare greater than 0.5D.

The upper slit opening 154 prevents dust from being accumulated on the upper portion of the outer wall of the air supply pipe 140, thereby reducing the risk of accidents such as fire due to dust accumulation.

The air supply pipe 140 may further include a bottom slit opening 156 to prevent dust from falling on the bottom of the inner wall of the air supply pipe 140.

The slit opening 156 may be opened by an angle of? With respect to the center of the air supply pipe C as described above. Preferably, [theta] may be between 10 and 60 degrees. Therefore, the lower surface slit opening portion 156 may be a portion opened at 10 to 60 degrees in the lower surface of the air supply pipe. If? is less than 10 degrees, the area of the opening portion is not sufficient and the effect of preventing the bottom dust accumulation may be insufficient. If? is larger than 60 degrees, The ratio is undesirably increased. This angle (&thetas;) condition takes into account the flow analysis results in the apparatus, and is not a simple design change.

The length l ₃ of the slit opening 156 may be 0.1L to 0.4L. The length l ₃ of the slit opening portion 156 is formed to be one third to one half of the length l ₁ of the slit opening 154 in the upper surface slit 154a side by side with the air supply pipe 140 It is possible. If the length l ₃ of the slit opening 156 is less than 0.1 L, there is a risk of dust accumulation on the bottom surface of the air supply pipe 140. If the length l ₃ is larger than 0.4 L, there is no difference in effect. none.

The side discharge hole 150 has a slit shape having a constant size up to the end of the air supply pipe 140. It is also possible that the end of the supply pipe 140 is closed and the contaminated air is injected only through the side discharge hole 150 and the end of the supply pipe 140 is open at the front. It is also possible that the end of the supply pipe 140 is clogged and the end discharge hole is formed. The side discharge hole 150 may be formed to extend to the end of the air supply pipe 140 or may be formed to end before the end.

The length of the side of the exhaust hole (150) (l ₄₎ may be a 0.5L to 0.8L. The length of the side of the exhaust hole (150), (l ₄₎ may be formed at the same level as the length (l ₁₎ of the air supply pipe 140 and the parallel slits (154a) of the upper surface of the slit opening portion 154. The The length of the side of the exhaust hole (150) (l ₄₎ is less than 0.5L may be insufficient, and the jet flow speed of the hard to the cyclone desired degree greater than 0.8L.

9 to 11 are views for explaining installation positions of the air supply pipe.

Referring to FIG. 9, when the length of one side 130a and the side 130c of the lower case 130 through which the air supply pipe 140 penetrates is W, the air supply pipe 140 is disposed on both sides of the lower case 130 130b, and 130d, respectively, at a distance W _{1 of} 0.07 W to 0.15 W, respectively. This distance (W ₁ ) condition takes into account the flow analysis results in the device and is not a simple design change.

FIG. 10 shows a case where W ₁ is smaller than the upper range.

If W ₁ is too small, there is a possibility that the dust that has struck the side wall and is reflected back to the air supply pipe 140, and the dust stuck area B is generated at the edge of the wall where the air supply pipe 140 is directed.

FIG. 11 shows a case where W ₁ is larger than the upper range. If W ₁ is too large, the area of the side wall that suffices for spraying becomes small and the effectiveness of the present invention is deteriorated, and the wall surface to which the sprayed air is not applied is not suitable. And a dust-impregnated region B is formed on a side portion just below the surface through which the air supply pipe 140 penetrates.

Referring to FIG. 9, when the length of the side surfaces 130b and 130d perpendicular to the one surface 130a and 130c of the lower case 130 through which the air supply pipe 140 passes is S, The inner length L may be 0.15 S to 0.25 S, which is the length of the portion of the lower case 130 which is located inside the lower case 130.

If the internal length L is too small, the flow rate of the air injected from the air supply pipe 140 increases sharply, which may interfere with the fall of the internal dust. If the internal length L is larger than the upper range, it may be a bad design since the supply pipe 140 reduces the drop area.

In this embodiment, one side discharge hole 150 is formed in the air supply pipe 140, but the side discharge hole may be formed to be vertically symmetrical with respect to the horizontal surface. That is, it may be formed in two places on the upper and lower sides with respect to the horizontal plane.

On the other hand, the side discharge holes may have a shape other than the slit shape, which is shown in FIGS. 12 to 14. FIG. 12 to 14 are views for explaining examples of various side discharge holes of the air supply pipe of the bag filter filtering dust collector according to an embodiment of the present invention.

Referring to FIG. 12, the side discharge hole 150 'may have a tapered shape that becomes narrower toward the end of the air supply pipe 140'. The side discharge hole 150 'may be formed to extend to the end of the air supply pipe 140' or may be formed to end before the end.

Fig. 13 shows side tapered side discharge holes 150 '.

(a) is a shape in which the width is initially constant, and the width becomes narrower toward the end, converging to a sharp point. (b) is a shape in which the width becomes narrower from the beginning to the end, converging to a sharp point. (c) shows a case in which the width becomes narrower from the beginning to the end, but is formed into a shape having a constant width. As shown in FIG. 12, the width of the side discharge hole 150 ', which becomes narrower toward the end portion as described above, is reduced when the width is discontinuously narrowed, when the width is continuously narrowed as shown in FIG. 13, And the like.

Referring to Fig. 14, the side discharge hole 150 "may be a plurality of circular openings whose diameters decrease toward the end of the supply pipe 140 ". The circular opening can be formed by punching.

Hereinafter, an excellent effect of preventing dust accumulation of the present invention will be described through the results of the flow analysis of the present invention.

 FIG. 15 is a flow analysis view of a plane portion of a bag filter filtration and dust collecting apparatus according to an embodiment of the present invention, and FIG. 16 is a diagram illustrating a three-dimensional flow analysis of a bag filter filtering and dust collecting apparatus according to an embodiment of the present invention.

Referring to FIG. 15, when two supply pipes 140 are staggered to face each other and inject air to the side walls, the flow velocity is highest at the end of the air supply pipe 140 (red-yellow high speed region) The air containing the dust comes out of the side wall and reflects out and shows a strong flow velocity (yellow-green-yellow medium velocity region). This air flow sweeps the side wall as indicated by the arrows, so that dust can be prevented from being accumulated on the side wall. The middle part of the device can be a drop area (blue low speed area) because the flow velocity is smaller than other parts.

As described above, it can be confirmed that the air biased area does not particularly occur in the apparatus, and dust deposition on the inner wall surface can be prevented. Particularly, as the air supply flow is injected to the outer wall surface, the stream flow seen from the upper part shows that the nearby flow rate is increased and the strong rotating flow is generated and dust can be removed from the side wall.

In this way, the existence of the region where the dust is not brought into contact with the wall surface and falls to the lower dust discharging device due to the low flow rate at the middle portion between the air supply pipes 140 is proved by the flow analysis. As described above, according to the present invention, there is an effect that dust accumulation can be prevented by collecting and collecting dusts at the center while removing dust.

Fig. 16 also shows the flow in the vertical direction of the device. Referring to FIG. 16, as indicated by the red arrow, a strong flow velocity is generated at the side of the apparatus, and the wall surface is swept to prevent dust accumulation on the side wall. In addition, the heavy particles descend on the wall surface like a cyclone, and the light particles rise and fall down to the fall area of the central space at the time of dust purging.

The present invention helps to clean dust on the inside of the bag filter filtration and dust collecting apparatus as well as dust. The relatively heavier dust drops down from the side with a large rotational flow, the air is suctioned from the bag filter side, and the relatively light dust drops into the central space by the high pressure nitrogen gas injection during bag filter purging. According to the present invention, dust collection can be effectively performed even in a bag filter filtration and dust collecting apparatus having a narrow area.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

100: Bag filter Filtration and dust collecting device
110: bag filter
120: upper case
130: Lower case
140, 140 ', 140 ": Supply pipe
150, 150 ', 150 ": side discharge hole
154: upper surface slit opening
156: lower slit opening
160: Upper exit
170: Purging device
180: Dust extraction device

Claims (16)

A bag filter filtration and dust collecting apparatus using a bag filter for collecting dust and the like from polluted air to be supplied to the outside,
An upstanding cylindrical upper case in which a plurality of bag filters for filtering dust are installed in a vertical direction;
A lower case formed at a lower end of the upper case and collecting dust falling from the bag filter and having a smaller area as it goes down; And
And two or more air supply pipes which penetrate the lower case and supply polluted air into the bag filter filtering and dust collecting apparatus,
Wherein the air supply pipe is provided on both opposite sides of the lower case so as to be offset from each other, and a side discharge hole is formed in a side surface of the supply pipe, the air flow between the two or more supply pipes is rotated along the inner circumference of the lower case, Wherein the central space between the two or more supply pipes is formed with an area where dust can fall. The bag filtering and dust collecting apparatus according to claim 1, wherein the air supply pipe further comprises an upper slit opening portion for preventing dust from being deposited on the upper portion of the outer wall of the air supply pipe. The air conditioner according to claim 2, wherein the upper surface slit opening portion is formed in a T shape including a slit parallel to the air supply pipe extending to the air supply pipe end portion and a slit perpendicularly formed on the upper surface of the air supply pipe end portion. Filter filtration dust collector. 4. The air conditioner according to claim 3, wherein a length of a portion of the air supply pipe extending inwardly of the lower case is L and a diameter of the air supply pipe is D, 0.5L to 0.8L, and the length of the slit formed vertically is 0.3D to 0.5D. The bag filtering and dust collecting apparatus according to claim 1, wherein the air supply pipe further comprises a bottom slit opening to prevent dust from being deposited on the bottom of the inner wall of the air supply pipe. The bag filtering and dust collecting apparatus according to claim 5, wherein the lower surface slit opening is a portion opened by 10 to 60 degrees with respect to the center of the air supply pipe. The bag filtering apparatus according to claim 5, wherein an inner length of a portion of the air supply pipe protruding from the inside of the lower case is L, and a length of the lower side slit opening is 0.1L to 0.4L. . The bag filtering and dust collecting apparatus according to claim 1, wherein the side discharge holes are formed in a slit shape having a predetermined size to an end portion of the air supply pipe. The bag filtering and dust collecting apparatus according to claim 1, wherein the side discharge holes are tapered so as to be narrowed toward the end of the air supply pipe. The bag filtering and dust collecting apparatus according to claim 1, wherein the side discharge holes are a plurality of circular openings whose diameters decrease toward the end of the supply pipe. 2. The bag filter according to claim 1, wherein the length of the side discharge hole is 0.5L to 0.8L, where L is the length of the portion of the air supply pipe projecting inside the lower case, . The air conditioner according to claim 1, wherein when the length of one surface of the lower case through which the air supply pipe passes is W, the two or more supply pipes are located at a distance of 0.07W to 0.15W from both side surfaces of the lower case A bag filter and a dust collector. 2. The air conditioner of claim 1, wherein the length of a side of the air supply pipe perpendicular to one surface of the lower case through which the air supply pipe passes is S, S of the bag filter. The bag filtering and dust collecting apparatus according to claim 1, wherein the air supply pipe is formed at a position close to the middle or middle of the upper and lower lengths of the lower case. The bag filtering and dust collecting apparatus according to claim 1, further comprising a purging device for removing dust accumulated in the bag filter. The bag filter according to claim 1, wherein the air supply pipe directs the air jet toward the inner side wall of the upper case or the lower case, and the jetted air hits the side inner wall to cause a rotational flow inside the apparatus. Dust collector.

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