JP2006223943A - Bag filter and dust collector equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag filter capable of achieving the enhancement of an exhaust gas purifying capacity and the miniaturization of an installation space, and a dust collector equipped with it. <P>SOLUTION: The bag filter is equipped with a bottomed flat bag-shaped bag filter body 13 opened at its one end, the end plate 14 which is formed into a flat shape long in the longitudinal direction of the bag filter body and attached to the opening end of the bag filter body to close the opening end and a retainer 12 equipped with a shape holding member, which is fixed to the end plate to be inserted in the bag filter body and holds the bag filter body to a flat bag-like shape from the inside, and bell mouths 16 which are allowed to communicate with the air holes bored in the end plate to be provided to the outer surface of the end plate in a protruded state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag filter that removes dust (dust) such as wood chips and dust from exhaust exhausted from a woodworking machine, a polishing machine, an incinerator or the like, and a dust collector equipped with the same.

  In general, in a woodworking machine, a polishing machine, and an incinerator, a dust collector equipped with a bag filter is frequently used to remove dust in exhaust gas discharged from these machines (see, for example, Patent Document 1).

  As these conventional bag filters, for example, a cylindrical bag filter 1 shown in FIG. 9A (see, for example, Patent Documents 2 and 3) and a flat bag filter 2 shown in FIG. 9B are known.

  The cylindrical bag filter 1 is attached to a bag filter body 1a such as a cloth bag shape held in a cylindrical shape with a bottom by a shape holding member (not shown), and an open end (the upper end in FIG. 9A) of the bag filter body 1a. It has a disc-shaped end plate 1b and a substantially cylindrical bell mouth 1d protruding from the outer surface side of the vent hole 1c of the end plate 1b.

  The cylindrical bag filter 1 is filtered by allowing the exhaust to flow inward from the outer surface of the bag filter main body 1a as shown by the solid line arrow in the figure, and discharging the purified exhaust from the cylindrical bell mouth 1d to the outside. It is designed to purify the exhaust.

  On the other hand, the flat bag filter 2 has a bag-shaped bag filter body 2a which is held in a flat cylindrical shape with a bottom by a shape holding member (not shown), and an open end of the bag filter body 2a (the upper end in FIG. 9B). ) And a substantially rectangular rectangular tube-shaped ventilation tube 2d protruding from the outer surface of the vent hole 2c of the end plate 2b.

  Further, the flat bag filter 2 is configured such that the exhaust is ventilated inward from the outer surface of the bag filter main body 1a as shown by a solid line arrow in FIG. The exhaust gas is purified by exhausting it from the outside.

The cylindrical bag filter 1 and the flat bag filter 2 are backwashed by, for example, a pulse jet backwashing device. That is, contrary to the exhaust direction indicated by the solid arrows shown in FIGS. 10A and 10B, pulsed backwash air having a required pressure is intermittently applied from the outside into the bell mouth 1d and the square tube-shaped ventilation tube 2d. Sprayed into the bag filter bodies 1a and 2a. As a result, the bag filter main bodies 1a and 2a vibrate to remove dust adhering to the outer surfaces of the bag filter main bodies 1a and 2a.
JP-A-7-737 JP 2003-170016 A JP 7-156128 A

  However, since the planar shape of the bag filter main body 1a and the end plate 1b is circular in the cylindrical bag filter 1, as shown in FIGS. 10 (a) and 10 (b), for example, a plurality of cylindrical bag filters 1 are provided. When installed in the dust collector, there is a problem that the flat area of the installation space is larger than that of the flat bag filter 2 and the size of the dust collector is increased.

  That is, since the flat shape of the flat bag filter 2 is flat, it can be installed at a high density by arranging a plurality of flat plate bag filters 2 in the short direction. On the other hand, the cylindrical bag filter 1 cannot be installed at a higher density than the flat bag filter 2 because its planar shape is circular.

  Therefore, when the cylindrical bag filter 1 and the flat bag filter 2 are installed in such a number that the outer surface areas of the two bag filter bodies 1a and 2a are equal to each other, the plane area of the installation space is, for example, a cylindrical bag filter. The installation space of 1 is larger than the flat bag filter 2.

For example, in FIGS. 10A and 10B, when the length of the bag filter main bodies 1a and 2a is 1 m and the area per bag filter is 1 m ² , twelve cylindrical and flat bag filters 1, The flat area required to install each of the two is illustrated. If the pitch between the bag filters is 100 mm, the flat area is about 1.52 m ^{2 in} the case of the cylindrical bag filter 1. In the case of 2, it is about 0.72 m ² , and the cylindrical bag filter 1 needs a plane area about twice that of the flat bag filter 2. For this reason, the dust collector incorporating the cylindrical bag filter 1 becomes larger than the dust collector incorporating the flat bag filter 2.

  On the other hand, the flat bag filter 2 can reduce the size of the dust collector as compared with the cylindrical bag filter 1, but has a problem that the backwashing effect by the pulse jet method is lower than that of the cylindrical bag filter 1, for example.

  That is, when air for backwashing at a required pressure is intermittently jetted onto the bell mouth 1d, the cylindrical bag filter 1 uses the ejector effect of the bell mouth 1d to remove the air around the backwashing air. Since it can be introduced into the bell mouth 1d as an accompanying flow, the air volume of the backwash air introduced into the bell mouth 1d can be increased. For this reason, contrary to exhaust purification, the amount of air flowing through the backwash air from the inner side toward the outer side of the filter main body 1a increases, so that the dust adhering to the filter main body 1a that is blown off by this air flow is increased. The amount of dust removal can be increased. That is, the backwashing effect can be improved.

  However, the square tube-shaped ventilation tube 2d is not cylindrical and is a rectangular tube that is long in the longitudinal direction of the end plate 2b, and therefore, the ejector effect is lower than that of the bell mouth 2d. For this reason, since the amount of backwashing air introduced into the square tubular vent pipe 2d is small, the backwashing effect is also low. Therefore, the filter main body 2a itself cannot be increased in size. For this reason, there is a problem that the exhaust purification treatment capacity is also small.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bag filter capable of improving exhaust purification treatment capacity and reducing the installation space, and a dust collector equipped with the same. is there.

  The invention according to claim 1 is a bottomed flat bag-shaped bag filter main body having one end opened, and an end formed by attaching the opening end of the bag filter main body to a flat shape long in the longitudinal direction of the bag filter main body. A plate, a shape holding member that is fixed to the end plate and inserted into the bag filter body and holds the bag filter body from the inside in a flat bag shape, and communicates with a vent hole formed in the end plate. And a retainer including a bell mouth projecting on the outer surface of the end plate.

  The invention according to claim 2 is the bag filter according to claim 1, wherein a plurality of the bell mouths are arranged in the longitudinal direction of the end plate.

  The invention according to claim 3 is characterized in that the bag filter body has an annular protrusion protruding outward at an opening end thereof, and the end plate has a reduced diameter end portion of the annular protrusion of the bag filter body. 3. The bag filter according to claim 1, further comprising: a side plate portion that presses the side outer surface inward, and a guide that presses the inner surface on the reduced diameter end portion side outward and clamps the side plate portion with the side plate portion. .

  According to a fourth aspect of the present invention, the shape maintaining member is disposed in an outer frame that supports a radially inner side surface and an inner bottom surface of the bag filter, and in an axial direction and a width direction inside the outer frame. The bag filter according to claim 1, further comprising a reinforcing member that reinforces the outer frame.

  According to a fifth aspect of the present invention, there is provided a housing provided with an exhaust inlet, an exhaust outlet, and an exhaust ventilation path for communicating the exhaust inlet and the outlet, and the exhaust ventilation path in the housing is connected to a dust room on the exhaust inlet side and an exhaust outlet side. A partition wall hermetically partitioned from the clean room, and a mounting hole for mounting the bag filter so that the bell mouth is opened in the clean room while the bag filter body is located in the dust room while being perforated in the partition wall The bag filter according to any one of claims 1 to 3, which is attached to the attachment hole, and a backwashing device for injecting air for backwashing to the bell mouth. It is a dust collector.

  According to the first aspect of the present invention, since the bell mouth having a high ejector effect is provided on the rectangular end plate, for example, the backwashing effect of the bag filter body by the pulse jet method is also high.

  Therefore, the amount of dust removed by dust adhering to the outer surface of the bag filter body can be increased by backwashing air, so that the filter area of the bag filter body can be increased. As a result, the exhaust gas purification capacity can be improved.

  In addition, since the bag filter body and the end plate are both flat, it is possible to reduce the installation space of the bag filter by arranging a plurality of bag filters in the short direction. Therefore, it is possible to reduce the size of the dust collector that accommodates the plurality of bag filters.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same or corresponding parts are denoted by the same reference numerals.

  1 is a partially cut-away perspective view showing the overall configuration of the bag filter 11 according to an embodiment of the present invention, FIG. 2 is a partially-cut perspective view showing the overall configuration of the retainer 12 of the bag filter 11, and FIG. FIG. 3 is a partially cutaway perspective view of the retainer 12 when viewed from below.

  As shown in FIG. 1, the bag filter 11 includes a retainer 12 made of metal or the like shown in FIGS. 2 and 3, and a non-woven fabric made of, for example, cotton or synthetic fiber or a glass fiber woven attached to a part of the retainer 12. And a bag filter body 13 which is a filter cloth formed in a flat bottomed bag shape with a cloth.

  The retainer 12 includes a rectangular end plate 14, a shape holding frame 15 that is an example of a shape holding member fixed to the end plate 14, and a plurality of cylindrical shapes fixed to the outer surface (upper surface in FIG. 1) of the end plate 14. A bell mouth 16, 16, 16 is provided.

  As shown in FIGS. 2 to 4, the end plate 14 is a pair of left and right side plates bent substantially perpendicularly downward in the figure at both ends in the width direction (short direction) of the rectangular flat plate-like top plate portion 14 a. Portions 14b, 14b, a plurality of circular through holes 14c, 14c, 14c formed in the longitudinal direction of the top plate portion 14a at a required pitch, and both longitudinal end portions of the top plate portion 14a And a plurality of small mounting holes 14d, 14d, 14d, 14d of small circular through holes drilled in the middle portion thereof, and a guide plate 14e fixed to the inner surface of the top plate 14a as shown in FIG. I have.

  The end plate 14 has a bell mouth 16 made of metal or the like that is concentrically connected to each of the vent holes 14c on the outer surface of the top plate portion 14a.

  The bell mouth 16 is formed integrally in a drum shape by reducing the axial middle portion of the hollow cylindrical body to a body portion having a smaller diameter than both ends thereof, and is formed in one end in the axial direction (in FIGS. The lower end is fixed to the outer surface of the top plate portion 14a by welding or the like, and the other axial end (opening upper end in FIGS. 1 and 2) is opened to the outside. The outer diameter of the large-diameter end of the bell mouth 16 is smaller than the width of the end plate 14. When the inner diameter of the reduced diameter body of the bell mouth 16 is a, the inner dimension in the width direction of the guide plate 14e of the end plate 14 is b, and the inner diameter of the lower end of the opening of the bell mouth 16 is c, a <b <c Is formed to hold.

  The shape holding frame 15 is inserted into the bottomed flat bag-shaped bag filter main body 13 and holds the shape of the bag filter main body 13 in a flat bag shape from the inside. An outer frame 15a formed by bending a metal circular tube into a substantially U-shape, and a fixed pitch in the axial direction at an intermediate portion in the axial direction of the bottom web of the outer frame 15a. For example, a plurality of vertical straight columns 15b, 15b made of metal straight tubes, and a plurality of straight tubular horizontal reinforcing bars 15c fixed in a transverse direction in FIGS. 1 and 2 of the U-shaped outer frame 15a. The outer frame 15a is reinforced to prevent deformation of the outer frame 15a. The horizontal reinforcing bar 15c is arranged in a plurality of stages with respect to the outer frame 15a.

  The outer frame 15a and the vertical intermediate pillars 15b and 15b have their respective free tips inserted into the small mounting holes 14d of the end plate 14 and fixed by welding or the like.

  The guide plate 14e is slightly fitted inside the opening end portion of the flat bottomed bag-like filter main body 13b shown in FIG. 1 in the drawing, and the opening end portion is used as a pair of left and right side plate portions 14b of the end plate 14. , 14b in the thickness direction, and is formed in an octagonal shape by a metal strip plate, for example.

  That is, the guide plate 14e is formed on the inner surface (the lower surface in FIGS. 2 to 4) of the end plate top plate portion 14a slightly inside the pair of side plate portions 14b and 14b of the end plate 14, and the pair of side plate portions 14b and 14b. A pair of guide side plate portions 14e1 and 14e1 arranged substantially parallel to 14b and the length of the pair of guide side plate portions 14e1 and 14e1 outside the bell mouths 16 located at both ends in the longitudinal direction of the end plate 14 A pair of guide end portions 14e2 and 14e2 that are integrally connected to both ends in the direction are integrally connected, for example, an octagonal closed ring shape is formed. The distance between the pair of guide side plate portions 14b, 14b is formed larger than the circular diameter of the lower end opening end portion of the bell mouth 16, and the backwashing air introduced from the outer peripheral portion of the outer opening end portion of the bell mouth 16 is smooth. It can be introduced into the bag filter body 13.

  As shown in FIG. 5, the bag filter body 13 is provided with an annular protrusion 13a having a circular or square axial cross section, for example, on the entire periphery of the upper end of the opening. The filter main body 13 is attached to the end plate 14 by being sandwiched in the thickness direction by the pair of 14 side plate portions 14b and 14b and the pair of guide side plate portions 14e1 and 14e1.

  FIG. 6 is a schematic diagram showing a configuration of a dust collector 18 in which a plurality of bag filters 11 thus configured are arranged in a housing 17 in, for example, a matrix.

  The dust collector 18 has a housing 17 made of a metal box such as iron, and a pyramid-shaped dust hopper 17a that gradually decreases in diameter toward the lower side in the figure is integrally or integrally formed at the lower portion of the housing 17, for example. A dust discharge device 17b for discharging slaked lime and dust to the outside is provided at the lower end of the reduced diameter of 17a. For example, an exhaust inlet 17 c is formed on the lower side surface of the dust hopper 17 a, while an exhaust outlet 17 d is formed on the upper side surface of the housing 17. An exhaust outlet duct 19 is connected to the exhaust outlet 17d, and an exhaust inlet duct 20 is connected to the exhaust inlet 17c, so that exhaust from an exhaust source such as an incinerator is introduced into the exhaust inlet 17c.

  The dust collector 17 is provided with a partition wall 21 for partitioning the inside of the housing 17 in a vertical direction in the figure in the housing 17, and a dust room 22 communicating with the interior of the housing 17 toward the exhaust inlet 17 c by the partition wall 21. And the clean room 23 that communicates with the exhaust outlet 17d.

  As shown in FIGS. 7 and 8, the partition wall 21 has a plurality of attachment holes 21 a that are fitted in the plurality of bag filters 11 in a matrix. Moreover, the annular protrusion 13a of each bag filter 11 is mounted on the upper surface in FIG. 6 of the partition wall 21, and the partition wall 21 is elastically deformed by the load of each bag filter 11 itself. It is made to adhere elastically on the upper surface. Furthermore, each bag is sandwiched between the inner peripheral wall of the mounting hole 21a and the guide plate 14e of each bag filter 11 so that the reduced diameter portion directly below the annular protrusion 13a of each bag filter body 13 is sandwiched in the thickness direction. The filter 11 is fixed to the mounting hole 21 a of the partition wall 21.

  Thereby, each bag filter 11 is suspended by the partition wall 21 in a state where the bag filter body 13 is suspended in the dust room 22. As shown in FIGS. 7 and 8, each bag filter 11 has an adhesion layer 24 formed by adhering a neutralizing agent such as powdered slaked lime and dust on the outer surface of the bag filter body 13.

  As shown in FIG. 6, the dust collector 17 is equipped with a pulse jet type backwash device 25. The backwashing device 25 is opened almost directly above the center of the opening of the bell mouth 16 of each bag filter 11 and the backwashing air duct 26 disposed horizontally above each bagfilter 11 in the housing 17. As described above, the plurality of nozzles 27, 27, 27,... Formed in the backwash air duct 26 are connected to the outer end portion of the backwash air duct 26 extending from the housing 17 to the backwash air for a predetermined pressure. A backwashing electromagnetic valve 27 is provided which is interposed in an air supply source (not shown) such as a compressor for supplying air and a backwashing air duct 26 to start or stop the backwashing air supply.

  Next, the operation of the dust collector 18 will be described.

  First, in the exhaust purification process, exhaust from a required exhaust source such as an incinerator (not shown) is introduced into the dust room 22 in the housing 17 through the exhaust inlet duct 20 by an intake fan.

  Then, as shown in FIG. 7, the entire bag filter body 13 contracts, and the exhaust air passes through the bag filter body 13 from the outer surface side to the inner surface side as indicated by the black arrows.

  During this ventilation, the exhaust is neutralized by the slaked lime of the adhesion layer 24, and the dust in the exhaust adheres to the adhesion layer 24 and is filtered and purified.

  The purified exhaust gas is discharged from the bell mouth 16 into the clean room 23 as shown by the white arrow in FIG. 7, and is discharged to an exhaust processing means (not shown) through the exhaust outlet duct 19 or exhausted to an exhaust stutter. From here, it is released to the outside air. Therefore, the dust adhering to the adhesion layer 24 of the bag filter 11 gradually increases as the operation time elapses, and the adhesion layer 24 becomes thick. For this reason, since the ventilation capacity and filtration capacity of the bag filter 11 are gradually reduced, a backwashing process is required.

  In the backwashing process, first, the backwashing electromagnetic valve 27 is opened, and backwashing air having a predetermined pressure is intermittently injected from each nozzle 27 of the backwashing air duct 26 every predetermined time.

  As a result, backwashing air is jetted in the form of a pulse jet at the center of the opening end of the bell mouth 16 of the bag filter 11 as indicated by the broken line arrow in FIG. The air around the backwashing air is entrained in the backwashing air and blown into the bell mouth 16 as an accompanying flow as shown by a thin arrow in FIG. 8, and from the bell mouth 16 into the bag filter body 13. It is blown and expands rapidly.

  For this reason, the bag filter main body 13 is vibrated to remove dusts such as slaked lime and dust adhered to the adhesion layer 24 to remove dust. Further, when the backwash air in the bag filter main body 13 is ventilated to the outer surface of the bag filter main body 13 and when the bag filter main body 13 is contracted by the ventilation, adhering substances such as slaked lime and dust are removed.

  Therefore, the backwashing air is intermittently blown into the bell mouth 16 of the bag filter 11 a plurality of times, so that deposits such as slaked lime and dust attached to the adhesion layer 24 of the bag filter 11 are removed. As a result, the exhaust filtering ability of the bag filter 11 is restored again.

  Deposits such as slaked lime and dust that have been wiped off in this way are received and collected by the dust hopper 17a below the bag filter 11, and discharged to the outside of the housing 17 by the dust discharge device 17b.

  Therefore, according to this dust collector 18, since the bell mouth 16 with a high ejector effect is assembled | attached to the bag filter 11, the slaked lime adhering to the bag filter 11 and the dust removal effect can be improved.

  For this reason, since the filter area of the bag filter 11 can be increased, the exhaust filter capacity can be improved by increasing the filter area.

  Further, the bag filter 11 has a bag filter body 13 formed in a flat shape and an end plate 14 formed in a rectangular flat shape corresponding to the flat shape of the bag filter 13. By arranging them in the short direction, the installation space for these bag filters 11 can be reduced in size.

  For this reason, it is possible to reduce the size of the housing 17 of the dust collector 18 in which the bag filters 11 are disposed.

  Further, since a plurality of bell mouths 16 are arranged in the longitudinal direction of the end plate 14, the amount of pulse jet-like backwash air introduced from the bell mouth 16 to the bag filter body 13 can be increased. The backwashing effect can be further improved.

  Further, as shown in FIGS. 7 and 8, the bag filter 11 includes an annular protrusion 13 a at the opening end of the bag filter body 13, a pair of side plate portions 14 b and 14 b of the end plate 14, and a pair of guide side plates. Further, the reduced diameter portion directly below the opening end annular projection 13a of the bag filter body 13 is attached to the pair of guide side plate portions 14e1 and 14e1 of the end plate 14e and the partition wall 21. The bag filter 11 can be strongly fixed to the partition wall 21 because it is sandwiched in the thickness direction by the inner peripheral surface of the hole 21a.

  Moreover, since the annular protrusion 13a of the bag filter 11 is elastically brought into close contact with the partition wall 21, it is possible to reduce the leakage of exhaust gas from the gap between the annular protrusion 13a and the partition wall 21.

  Furthermore, since the shape retaining frame 15 reinforces the outer frame 15a with the vertical intermediate columns 15b and 15b and the horizontal reinforcing bars 15c and 15c, the deformation of the outer frame 15a can be prevented or reduced. For this reason, the space | interval of the opposing surfaces of the bag filter main body 13 becomes narrow by contact with the deformation | transformation of the outer frame 15a, or it can prevent or suppress that ventilation resistance increases.

The partially cutaway perspective view of the bag filter concerning one embodiment of the present invention. FIG. 2 is a partially cut-away perspective view of a retainer of the bug filter shown in FIG. 1. FIG. 1 is a partially cutaway perspective view of the bag filter retainer shown in FIG. FIG. 4 is a partially cutaway enlarged perspective view of the end plate and its peripheral portion shown in FIG. 3. FIG. 3 is an upper perspective view of the bag filter shown in FIG. 1. The schematic diagram which shows the whole dust collector which arrange | positioned the bag filter shown in FIG. FIG. 7 is an enlarged vertical cross-sectional view of a mounting portion for attaching a bag filter to a partition wall in order to explain the operation of the dust collector shown in FIG. 6 during an exhaust process. FIG. 7 is an enlarged vertical cross-sectional view illustrating a mounting portion for attaching a bag filter to a partition wall in order to explain an exhaust process of the dust collector shown in FIG. 6. (A) is a perspective view of the conventional cylindrical filter, (b) is a perspective view of the conventional flat filter. FIG. 9A is a schematic diagram showing a plane of an installation pattern when a plurality of cylindrical filters shown in FIG. 9A are installed in a dust collector, and FIG. 9B is a diagram showing a plurality of flat filters shown in FIG. The schematic diagram which shows the installation pattern in the case of installing in a plane.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical bag filter 2 Flat bag filter 11 Bag filter 12 Bag filter retainer 13 Bag filter main body 13a Annular protrusion 14 of the opening end of the bag filter main body 14b End plate 14b A pair of side plate portions 14c of the end plate Hole 14e Guide plate 14e1 Guide plate side plate 15 Shape retaining frame 16 Bell mouth 17 Housing 17c Housing exhaust inlet 17d Housing exhaust outlet 18 Dust collector 21 Partition 21a Partition mounting hole 22 Dust room 23 Clean room 24 Adhesion layer 25 Backwash device 26 Air duct for backwashing

Claims (5)

A bottomed flat bag-shaped bag filter body with one open end;
An end plate which is formed in a flat shape which is long in the longitudinal direction of the bag filter body and which is closed by attaching an opening end of the bag filter body, and is fixed to the end plate and inserted into the bag filter body, A shape retaining member that retains the shape in a flat bag shape, a retainer that includes a bell mouth projecting on the outer surface of the end plate in communication with a vent hole formed in the end plate;
A bug filter characterized by comprising: The bag filter according to claim 1, wherein a plurality of the bell mouths are arranged in a longitudinal direction of the end plate. The bag filter main body has an annular protrusion protruding outward at an opening end thereof, and the end plate is a side plate portion that presses the outer surface of the bag protrusion main body toward the inside of the reduced diameter end portion. The bag filter according to claim 1, further comprising: a guide that presses the inner surface on the reduced diameter end portion side outward and clamps it with the side plate portion. The shape holding member is
An outer frame that supports a radially inner side surface and an inner bottom surface of the bag filter;
Reinforcing members that are disposed in the axial direction and the width direction inside the outer frame, respectively, and reinforce the outer frame;
The bag filter according to any one of claims 1 to 3, wherein the bag filter is provided. A housing having an exhaust inlet, an exhaust outlet, and an exhaust ventilation path for communicating between the exhaust inlet and the outlet;
A partition that hermetically partitions the exhaust ventilation path in the housing into a dust room on the exhaust inlet side and a clean room on the exhaust outlet side;
A mounting hole for attaching the bag filter so that the bell mouth is opened in the clean room, while the bag filter body is located in the dust room and is drilled in the partition wall,
The bag filter according to any one of claims 1 to 4, which is attached to the attachment hole,
A backwashing device for jetting air for backwashing to the bell mouth;
A dust collector characterized by comprising:

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