KR101913815B1 - Dust collector apparatus for smoking and fine dust - Google Patents

Abstract

The present invention relates to a smoke and fine dust filtration and dust collecting apparatus, and a smoke and fine dust filtration and dust collecting apparatus according to an embodiment of the present invention includes a collecting unit including an exhaust hood; A pretreatment filtering dust collector connected to the exhaust hood by piping and having a plate type filter; And a filtering and dust collecting part connected to the pre-filtration dust collecting part by a pipe and including a cylindrical filter, wherein the cylindrical filter includes a first filter, a second filter disposed inside the first filter, The first and second filters may each include a separate pipe, a filter cloth surrounding the other pipe, and a mesh screen surrounding the filter cloth.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting apparatus and a dust collecting apparatus,

The present invention relates to a smoke and fine dust filtration and dust collecting apparatus, and more particularly, to a smoke and fine dust filtration and dust collecting apparatus having high filtration efficiency and easy maintenance and management.

Generally, meat roast beef, pork and duck meat are roasted at a charcoal meat restaurant or at home or outdoors using a table roaster or a charcoal fire burner. On a grill (roast) of a roaster or charcoal grill, Smell and smoke as they burn together. These smells and smoke are mostly forced out to the outside by using the exhausting facilities in most large specialty restaurants.

Such an exhaust system generally includes an exhaust hood disposed on the upper side of a roaster or a char combustion furnace, an exhaust duct connected to the exhaust hood and communicating with the external space, and an exhaust fan generating a wind power.

The exhaust system thus constructed sucks the odor and smoke generated from the roaster or the charcoal burner at the time of cooking from the exhaust hood, and then exhausts the exhaust gas through the exhaust duct. The exhaust hood located directly above the grill or fire plate as a part directly sucking the smell and smoke from such an exhaust facility is generally located directly above the fire plate of the charcoal burner and sucks the smell and smoke.

In this process, grease and soot are attached to the inner wall of the exhaust hood, and various harmful substances such as oil residues, grease, soot, etc. adhered to the inner wall of the exhaust hood are mostly left untouched because they are difficult to clean.

The various kinds of harmful substances such as oil residue and soot attached to the inner wall of the exhaust hood are separated by roasting meat or food and not only hygiene is bad but also such fine oil and odor are discharged into the atmosphere as it is, have.

Further, since the exhaust hood is deteriorated due to the difficulty of cleaning the inner wall of the exhaust hood, the entire exhaust hood has to be replaced, thereby increasing maintenance and management costs.

To solve this problem, Korean Utility Model Registration No. 20-0472445 discloses a hood body having an inlet and an outlet, An intake fan installed in the hood main body and sucking air; A duct for an air curtain installed on the inner wall of the hood main body and introducing a part of the air discharged through the hood main body to form a downward vertical airflow; And an auxiliary duct provided around the outer periphery of the hood main body and guiding air discharged through the air curtain duct to the outside of the hood main body so that the duct for air curtain is spaced apart from the inner wall of the hood main body An exhaust plate having an exhaust passage formed therein, and an induction plate spaced from the exhaust plate top and guiding air into the exhaust passage.

Open Utility Model No. 20-2009-0005630 discloses a duct connecting device for a smoke discharge hood for exhausting smoke and odor generated when roasting a meat or a charcoal using a roaster.

An object of an embodiment according to the present invention is to provide a smoke and fine dust filtration and dust collecting apparatus with high filtration efficiency and easy maintenance and management.

An embodiment of the present invention relates to a dust collecting apparatus including a collecting unit including an exhaust hood; A pretreatment filtering dust collector connected to the exhaust hood by piping and having a plate type filter; And a filtering and dust collecting part connected to the pre-filtration dust collecting part by a pipe and including a cylindrical filter, wherein the cylindrical filter includes a first filter, a second filter disposed inside the first filter, Wherein the first filter and the second filter are each composed of a separate pipe, a filter cloth surrounding the other pipe, and a mesh screen surrounding the filter cloth. to provide.

The plate filter may have a unit plate filter formed with a plurality of perforated holes, and the unit plate filter may have a V-shaped bend bent in the -z and + z directions with respect to the horizontal direction in the x-y direction.

And the perforation hole of the unit plate filter is formed in a Z-shape.

And a V-shaped guide plate is attached to the V-shaped curved valley.

The plate-shaped filter may include an upper fitting plate having a groove and two side fitting plates, and the unit plate may be fitted in the groove.

The pretreatment filtration and dust collecting part may include a dust box disposed below the plate filter.

The air suction pipe may have a through-hole formed on an outer circumferential surface thereof.

And a speed reducer that decelerates the rotation of the cylindrical filter.

The filtering and dust collecting unit may further include an activated carbon filter including a housing, the cylindrical filter disposed inside the housing, the activated carbon filter connected to the cylindrical filter, and disposed outside the housing.

The activated carbon filter may include a porous tube and activated carbon disposed on the inner wall of the porous tube.

And a cleaning brush disposed in contact with one surface of the cylindrical filter.

And a dust box disposed at a lower portion of the cylindrical filter, wherein a cleaning brush disposed in contact with one surface of the cylindrical filter is mounted on an upper end of the dust box.

And a dust box disposed at the lower end of the cylindrical filter, wherein the dust box has a drawer structure.

The filtration and dust collecting part may include a housing, and a through hole may be formed on one surface of the housing to form a discharge part.

The smoke and fine dust filtration apparatus according to one embodiment of the present invention can control the animal beast and fine dust step by step and can replace and install the filter according to the inflow load and the inflow nature of the gas, Is very cheap.

Further, the smoke and fine dust filtration and dust collecting apparatus according to the present invention can control the charcoal meat frying and fine dust generated in the large and medium sized restaurants, and can treat the smoke containing beak in the center of the food processing industry.

In addition, it is very simple to maintain in consideration of household and business standards, and it is possible to easily perform filter replacement and maintenance maintenance without requiring a separate skilled engineer. In addition, the process of moving and separating is very simple and can be applied to the industrial field depending on the size of the apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram schematically showing a smoke and fine dust filtration and dust collecting apparatus according to an embodiment of the present invention; FIG.
1B is a perspective view and a cross-sectional view schematically showing an exhaust hood according to an embodiment of the present invention.
2B is an exploded perspective view schematically showing the pretreatment filtration and dust collecting section, FIG. 2C is an exploded perspective view schematically showing the pretreatment filtration and dust collecting section, 2D is a perspective view schematically showing the pretreatment filtration and dust collecting section, 2B is an exploded perspective view schematically showing the plate filter of the pretreatment filtration and dust collecting section, and FIG. 2E is a perspective view schematically showing the plate filter of the plate filter.
FIG. 3B is an exploded perspective view schematically showing the filtration and dust collecting section, FIG. 3C is an exploded perspective view schematically showing the filtration and dust collecting section, and FIG. 3C is an exploded perspective view schematically showing the filtration and dust collecting section. Is an exploded perspective view schematically showing a cylindrical filter.
FIG. 3E is a perspective view schematically showing a filtration and dust collecting unit according to an embodiment of the present invention, and FIG. 3F is a perspective view schematically showing a filtration and dust collecting unit according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Therefore, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the following embodiments.

Further, preferred embodiments of the present invention can be described with reference to the accompanying drawings, which are provided for a more complete understanding of the present invention to those skilled in the art. Therefore, the scope of the present invention is not limited to the accompanying drawings, and the shapes and sizes of the elements in the drawings may be exaggerated for clarity, and the elements denoted by the same reference numerals in the drawings are the same elements.

Throughout the description of the present invention, when a component is referred to as " comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view schematically showing a smoke and fine dust filtration and dust collecting apparatus according to an embodiment of the present invention, and FIG. 1B is a perspective view and a sectional view schematically showing an exhaust hood according to an embodiment of the present invention.

FIGS. 2A to 2E are views schematically showing a pretreatment filtration and dust collecting part according to an embodiment of the present invention, and FIGS. 3A to 3D schematically show a filtration and dust collecting part according to an embodiment of the present invention.

1, the apparatus for filtering and dusting fine particles according to one embodiment of the present invention includes a collecting unit 100, a pretreatment filtering and dust collecting unit 200 connected to the collecting unit 100 by a pipe 10, And a filtering and dust collecting unit 300 connected to the pretreatment filtering and dust collecting unit 200 and the piping 10.

The collecting unit 100 may include an exhaust hood 110 for sucking fumes, odors, smoke, and fine dust generated from a heat source. According to one embodiment of the present invention, a suction pipe (not shown) may be installed inside the exhaust hood.

1B is a perspective view and a cross-sectional view schematically showing an exhaust hood 110 according to an embodiment of the present invention.

In general, smoke, odor, beak, soot, and fine dust generated when meat is burned in a restaurant are highly volatile at high temperature and very fast in air.

According to an embodiment of the present invention, the exhaust hood 110 may be equipped with a collecting flange. As a result, the distance between the heat source and the hood can be increased, and the atmospheric diffusion of the hot meat fume and the inhalation of the human body can be controlled remarkably.

Further, the cross section of the hood can be made longer than the longitudinal section to minimize the diameter of the ascending airflow.

Also, it is desirable to minimize the cross-sectional area of the hood in order to secure the control speed and the control distance with a small amount of air. To this end, a micro grill mesh (111, micro grill mesh) plate may be installed at the entrance of the exhaust hood facing the heat source.

Thus, the processing efficiency can be improved, the scale can be minimized, and the energy cost and the maintenance cost can be greatly reduced.

The smoke, smoke, beak, soot, and fine dust inhaled from the exhaust hood 110 can be moved to the pretreatment filtering and dust collecting part 200 along the pipe 10.

2B is a perspective view schematically showing the pretreatment filtration and dust collecting part 200. FIG. 2C is a schematic perspective view of the pretreatment filtration and dust collecting part 200 (FIG. 2C). FIG. 2A is a perspective view schematically showing a pretreatment filtering and dust collecting part 200 according to an embodiment of the present invention, 2d is an exploded perspective view schematically showing the plate filter 220 of the pre-treatment filtration and dust collecting unit, and Fig. 2e is a perspective view schematically showing the unit plate filter of the plate filter.

2A to 2E, the fume and fine dust introduced from the collecting part 100 flows into the pretreatment filtering dust collecting part through the inlet 211 provided in the housing 210 of the pretreatment filtering dust collecting part, And then can be moved to the filtration and dust collecting part 300 along the pipe 10 through the discharge port 212.

As shown in the drawing, the pretreatment filtration and dust collecting unit 200 may include a housing 210 of a flesh-proof structure. An inlet 211 and an outlet 212 may be provided on the surfaces of the hexahedron corresponding to each other.

A plate-shaped filter 220 may be disposed between the inlet 211 and the outlet 212.

As shown in FIG. 2C, the upper and lower partition plates P may be disposed inside the housing 210. The upper and lower partition plates P may define a space in which the plate filter 220 is disposed and a space in which the inlet 211 and the outlet 212 are formed. Accordingly, the pressure applied to the plate-shaped filter can be adjusted.

Referring to FIGS. 2d and 2e, the plate-shaped filter 220 according to an embodiment of the present invention may include a unit plate filter 224 having a plurality of perforations E formed therein. Although Fig. 2d shows seven unit plate filters 224, the number of unit plate filters can be adjusted. The unit plate filter 224 may be disposed in a direction perpendicular to the inflow direction of the introduced air and gas. That is, when the x-y direction of the unit plate filter is defined as the horizontal direction, air and gas can flow in the z direction.

In addition, according to one embodiment of the present invention, the plate-shaped filter 220 includes a top-face fitting plate 221 and two side-face fitting plates 222 and 223 having grooves into which the unit plate filter 224 can be fitted .

The unit plate filter 224 can be disposed inside the housing 210 by sandwiching the unit plate filter 224 on the upper face fitting plate and the two side face fitting plates.

When the unit plate filter 224 is inserted into the groove of the fitting plate 221, the unit plate filter 224 can be easily attached and detached, and the maintenance and repair of the unit plate filter can be facilitated. Also, the number of unit plates can be adjusted so that it can be easily adhered to cope with the pressure loss of the apparatus due to inflow conditions.

The unit plate filter may be made of a metal, preferably, SUS (Steel Use Stainless). Accordingly, the unit plate can be separated from the unit plate and can be easily and semi-permanently used.

The air and gas introduced into the pre-filtration and dust collecting unit 200 pass through the plate filter 220 and fine dust and particulate matter contained in the air and the gas collide with the unit plate filter 224, ). ≪ / RTI >

FIG. 2E is a view schematically showing a unit plate filter 224 of a plate-shaped filter according to an embodiment of the present invention.

According to the present embodiment, the plate-shaped unit plate filter 224 is formed with a plurality of perforation holes E.

The perforation hole E may have a Z-shape. As shown in the figure, the Z-shaped perforation holes E may be connected to each other to form zigzag perforated holes. Although not shown, each of the Z-shaped perforated holes may be formed at a predetermined spacing from each other.

The shape of the perforation hole is not particularly limited, and a shape capable of increasing the residence time such as vapor, dust, etc. in the air can be used.

The unit plate filter 224 may have a V-shaped bend bent in the -z and + z directions with respect to the horizontal direction in the x-y direction. By repeatedly forming the V-shaped bending in the unit plate filter, it is possible to increase the area of collision with the vapor, particles and the like in the air to increase their residence time.

Further, a V-shaped guide plate 225 may be attached to the V-shaped curved valley. The V-shaped guide plate 225 may have a size smaller than a V-shaped bend formed in the unit plate type filter. The length and width of the V-shaped guide plate 225 in the x-axis direction and the z-direction may be the same or similar but the length in the y-axis direction of the V-shaped guide plate 225 is shorter than the y- .

Vapor or the like impinging on the unit plate filter 224 may flow to the guide plate 225 and the vapor or the like collected on the guide plate may drop downward from the guide plate. The falling vapor or the like can be collected in the dust box 230.

According to the embodiment of the present invention, when two or more unit-plate filters are arranged, the perforations formed in the unit-plate filters are arranged so as to be staggered so that the flow of airflow can be smoothly performed. Accordingly, it is possible to induce shock absorption and smooth suction by relieving the static pressure impact of the air stream, and durability can be increased by alleviating the bending phenomenon of the unit plate when the air flow collides with the static pressure.

According to an embodiment of the present invention, a dust box 230 may be provided in the housing of the pretreatment filtering dust collector. The dust box 230 may be disposed below the plate-shaped filter 220.

The dust box 230 may be installed at a lower end of the housing 210, and the dust box may have a drawer structure.

Fine dust and particles in the air can adhere while being passed through the plate-shaped filter 220, and can be stored in the dust box 230 arranged at the lower part while falling down.

When the dust box 230 has a drawer structure, the dust box 230 can be easily separated from the housing 210, and the dust accumulated in the dust box 230 can be easily cleaned and removed.

The plate type filter can be replaced with a filter according to an inflow load and an inflow characteristic of air. In addition, it is easy to change the structure of the filter, so that the filter can be easily replaced without any need of a skilled technician, and cleaning and maintenance are possible.

The gas discharged from the pre-filtration and dust collecting unit 200 may be introduced into the filtering and dust collecting unit 300. The gas introduced after the particle removal in the pretreatment filtration and dust collecting unit 200 can be filtered by the surface filtration method in the filtration and dust collecting unit 300.

3A is a perspective view schematically showing a filtration and dust collecting unit 300 according to an embodiment of the present invention, FIG. 3B is a perspective view schematically showing the filtration and dust collecting unit 300, and FIG. 3C is a view schematically showing the filtration and dust collecting unit 300 And 3d is an exploded perspective view schematically showing a cylindrical filter of the filtration and dust collecting section.

Referring to FIGS. 3A to 3D, a gas may be introduced by a damper 310 provided in the filtration and dust collecting unit 300.

Although not limited thereto, the filtration and dust collecting unit 300 may include a housing 330 of a flesh-proof structure. A damper 310 may be provided on one side of the hexahedron housing 330 and a discharge port 360 may be formed on the other side. A housing handle 311 may be mounted on the outer surface of the housing 330.

The air introduced through the damper 310 passes through the cylindrical filter 320. The cylindrical filter 320 may be disposed in a direction perpendicular to the air inlet direction. That is, the introduced air can flow into the cylindrical filter 320 through the side surface of the cylindrical filter 320. The air introduced into the cylindrical filter 320 may be filtered by a surface filtration method.

Referring to Figure 3D, the cylindrical filter 320 includes a first filter 321 and a second filter 322 disposed within the first filter, and an air suction pipe 323 disposed within the second filter .

A through hole may be formed in the outer circumferential surface of the air suction pipe 323.

The first filter 321 may include a different pipe 321a, a filter 321b surrounding the other pipe 321a, and a mesh screen 321c surrounding the filter cloth.

The other pipe 321a can be understood as a pipe made of a mesh having a through-hole formed therein.

Also, the second filter 322 may be composed of the other hollow pipe 322a, the filter cloth 322b surrounding the other pipe 322a, and the mesh screen 322c surrounding the filter cloth.

The above-mentioned other pipe and the mesh screen may be made of a metal material. But is not limited thereto, it can be made of hot-rolled steel sheet.

The first filter 321 and the second filter 322 and the air suction pipe 323 can be fixedly inserted into a venturi guide 324. The first filter 321 is fitted in a first outer frame A which is the outermost portion of the venturi guide 324 and is spaced apart from the first filter 321 by a predetermined distance from the second outer frame B, the second filter 322 can be fitted. The air suction pipe 323 can be caught in the center portion C of the venturi guide 324.

The cylindrical filter 320 is connected to the turbo fan 370 by a bearing 371 and rotates to filter the air. At this time, the filter cloth 321b of the first filter can be selected to have a higher porosity than the filter cloth 322b of the second filter. That is, the first filter 320 can function as a preprocessing filter. The material and the size of the air gap of the first and second filter cloths 321b and 322b may be appropriately selected according to the properties of the air to be purified.

The cylindrical filter 320 flows air by the other pipe, and the inflow cross-sectional area increases, thereby reducing the pressure loss. Accordingly, the durability of the filter cloths 321b and 322b is improved, and the replacement cycle of the filter cloth can be lengthened.

Further, the cylindrical filter 320 is connected to the reducer 340 so as to periodically reduce the rotation. Accordingly, the durability of the filter cloths 321b and 322b can be improved and the replacement cycle can be made long.

Also, according to an embodiment of the present invention, a dust box 350 may be provided in the filter dust collector 300. More specifically, the dust box 350 may be provided at the lower end of the cylindrical filter 320. The dust box 350 may be installed at a lower end of the housing 330, and the dust box 350 may have a drawer structure.

In addition, according to an embodiment of the present invention, a cleaning brush 351 may be included which is in contact with one surface of the cylindrical filter 320.

The cleaning brush 351 may be disposed above the dust box 350.

When the cylindrical filter 320 is decelerated by the speed reducer 340, the dust and the like attached to the cylindrical filter 320 may be removed by the cleaning brush 351.

Fine dust or the like in the air introduced into the cylindrical filter 320 may be dropped downward through surface filtration or attached to the filter. Particles attached to the filter are desorbed by the cleaning brush 351, and these particles can be stored in the dust box 350.

If the dust box 350 has a drawer structure, the dust box 350 can be easily separated from the housing 330, and the dust accumulated in the dust box 350 can be easily cleaned and removed.

Further, a dust hole gate 352 may be mounted on the dust box 350 so that the collected dust is not re-dispersed due to the inflow of air. At this time, the cleaning brush 351 may be installed on the dust hole gate 352.

Also, according to an embodiment of the present invention, a handle 320a of a cylindrical filter may be provided on the outer surface of the housing 330. The cylindrical filter 320 can be disposed inside or separated from the housing by the handle 320a of the cylindrical filter.

According to an embodiment of the present invention, the air that has passed through the cylindrical filter 320 may be discharged to the outside through a discharge unit 360 formed on one side of the housing 330.

The discharge unit 360 may be formed with a through hole on one side of the housing 330 without a separate vent so that air can be discharged to the outside without resistance.

FIG. 3E is a perspective view schematically showing a filtration and dust collecting part according to another embodiment of the present invention, and FIG. 3F is a perspective view schematically showing the filtration and dust collecting part.

In the case of the present embodiment, unless otherwise stated, the filtration and dust collecting part may have the same constituent elements as those of the above embodiment.

The filtering dust collecting unit 300 of the present embodiment is not provided with a through-hole outlet formed on one surface of the housing 330 as compared with the above-described embodiment.

And an activated carbon filter 380 connected to the cylindrical filter 320 instead.

The activated carbon filter 380 may be installed outside the housing 330 and the air passing through the cylindrical filter 320 may be discharged to the outside through the activated carbon filter 380.

The activated carbon filter 380 may include a tail pipe 381 and an activated carbon 382 disposed on the inner wall of the pipe.

The bottom surface of the other pipe (381) may not have a through hole. Accordingly, the introduced air does not go to the bottom, but passes through the activated water 382 disposed on the inner side, so that the foreign matter can be adsorbed and the odor can be deodorized and then discharged to the outside.

The cylindrical filter according to an embodiment of the present invention can control the fine dust in the air step by step and can replace and install the filter according to the inflow and outflow characteristics of the air.

The smoke and fine dust filtration and dust collecting apparatus according to the present invention can control the charcoal meat frying and fine dust generated in the large and medium sized restaurants, and can treat the smoke containing beak in the center of the food processing industry.

In addition, it is very simple to maintain in consideration of household and business standards, and it is possible to easily perform filter replacement and maintenance maintenance without requiring a separate skilled engineer. In addition, the process of moving and separating is very simple and can be applied to the industrial field depending on the size of the apparatus.

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 scope of the present invention. It is evident that many variations are possible by those skilled in the art. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

100: collecting part 200: pretreatment filtration and dust collecting part
300: Filtration and dust collecting part 110: Exhaust hood
210: Pretreatment filtration and dust collecting housing 220: Plate filter
221, 222, 223: a fitting plate 224: a unit plate
230, 350: dust box 310: damper
320: Cylindrical filter 330: Housing of filtration and dust collecting part
340: Reducer 360:
370: Turbo fan 380: Activated carbon

Claims (14)

A collecting part including an exhaust hood;
A pretreatment filtering dust collector connected to the exhaust hood by piping and having a plate type filter; And
And a filtering and dust collecting part connected to the pretreatment filtering and dust collecting part by a pipe and including a cylindrical filter,
Wherein the cylindrical filter has a first filter, a second filter disposed inside the first filter, and an air suction pipe disposed inside the second filter, wherein the first and second filters are respectively connected to the other pipe, And a mesh screen surrounding the filter cloth,
Wherein the plate filter has a unit plate filter in which a plurality of perforated holes are formed, the unit plate filter having a V-shaped bend bent in the -z and + z directions with respect to the horizontal direction in the xy direction,
Wherein the perforation hole of the unit plate filter is formed in a Z-
Wherein the plate-shaped filter includes an upper fitting plate having a groove and two side fitting plates, the unit plate filter being fitted in the groove,
Wherein the filter and dust collecting part includes a housing, the cylindrical filter is disposed inside the housing, the cylindrical filter is connected to the turbo fan by a bearing and rotates,
A handle of a cylindrical filter is provided on the outer surface of the housing,
And a dust box disposed at a lower portion of the cylindrical filter, wherein a dust hole gate is mounted on an upper portion of the dust box, and a cleaning brush disposed in contact with one surface of the cylindrical filter is mounted on the dust hole gate Smoke and fine dust filtering and dust collecting device.
delete delete The method according to claim 1,
And a V-shaped guide plate is attached to the V-shaped curved valley.
delete delete The method according to claim 1,
Wherein the air suction pipe has a through-hole formed on an outer circumferential surface thereof.
The method according to claim 1,
And a decelerator for decelerating the rotation of the cylindrical filter.
The method according to claim 1,
Further comprising an activated carbon filter connected to the cylindrical filter and disposed outside the housing.
10. The method of claim 9,
Wherein the activated carbon filter comprises a porous tube and activated carbon disposed on an inner wall of the porous tube.
delete delete The method according to claim 1,
Wherein the dust box has a drawer type structure.
The method according to claim 1,
And a through hole is formed in one surface of the housing to form a discharge portion.

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