WO2014045446A1

WO2014045446A1 - Dust-collector filter element and dust collector

Info

Publication number: WO2014045446A1
Application number: PCT/JP2012/074424
Authority: WO
Inventors: 眞司片山
Original assignee: ジェイアンドエスエンジニアリング株式会社
Priority date: 2012-09-24
Filing date: 2012-09-24
Publication date: 2014-03-27

Abstract

Provided are a dust-collector filter element and a dust collector which protect a pleated filter fabric from paint particles. A filter element (10) adheres a first precoat material (Pf) in the form of raised dust particles to the filter surface of a pleated filter material (2) in a substantially adhered state, and then adheres a second precoat material (Pc) to the first precoat layer (P1), making it possible to leave the first precoat layer (P1) intact while removing the second precoat material (Pc) by spraying pulsed air (Pa), and also making it possible to use the first precoat layer to protect the filter surface of the pleated filter material (2) from strongly adhesive paint particles not adsorbed by the second precoat material (P2).

Description

Filter element for dust collector and dust collector

The present invention relates to a filter element for a dust collector and a dust collector. In particular, the present invention relates to a filter element for a dust collector and a structure of the dust collector that are suitable for filtering paint particles having high adhesion supplied to the dust collector and collecting the paint particles.

For example, surplus paint mist is generated in a painting booth for painting the body of an automobile. In this painting booth, a dust collector is installed, and the paint mist is supplied to a dust collector having a filter disposed therein, and is filtered by collecting paint particles with the filter. Since these paint particles have strong adhesion, they were adsorbed on the precoat material and filtered.

As a dust collector filter for filtering paint particles, dry powder such as calcium carbonate is generated inside the dust collector and sucked, so that the dry powder as a precoat material is attached in advance to the surface of the filter, A dust collector filter is known in which paint particles are adsorbed by a precoat material by sucking paint mist to prevent clogging of the filter (see, for example, Patent Document 1).

The filter for the dust collector as described above can remove the pre-coating material that has captured the paint particles from the surface of the filter by so-called back washing by blowing pulse air from the direction opposite to the dust collecting direction. For example, a precoat material that captures paint particles can be reused as a resource to be mixed in concrete.

円筒 Cylindrical filter elements are known as filter elements used in such industrial dust collectors. The cylindrical filter element is composed of a cylindrical retainer (support frame) with one end closed and the other end opened, and a filter cloth (pleated filter cloth) folded in a triangular wave shape covering the outer periphery of the retainer. is doing.

The cylindrical filter element described above generates pre-coating material in the dust collector and sucks it, so that the pre-coating material is attached in advance to the surface of the pleated filter cloth, and the paint mist is sucked into the paint particles. Is adsorbed on the precoat material and filters the paint particles. And the dust adhering to the surface of a pleat type filter cloth can be wiped off by spraying pulse air toward the inside from the opening surface of a retainer.

Since such a cylindrical filter element causes the life of the pleated filter cloth to expand excessively during backwashing and shortens its life, the intermediate part of the filter cloth is held by the ring member, A cylindrical filter element having a cushioning material attached to the peripheral surface is disclosed (for example, see Patent Document 2).

Further, as a filter element used in such an industrial dust collector, a flat filter element is known. As such a flat filter element, it is connected to a flat filter formed into a cylindrical shape by two sheet-like filter media facing each other and folded into a bowl shape, and connected to the upper end of the flat filter, and by a flat filter. The upper end member provided with the air outlet configured, a cap connected to the lower end of the planar filter, and a reinforcing member provided with a resin pipe or a round bar across the planar filter. A flat filter element is disclosed (for example, see Patent Document 3).

The flat filter element according to Patent Document 3 realizes downsizing in a dust collector using a cartridge element, and can effectively remove dust, and is simple in structure and handling. .

JP 2011-41934 A Japanese Utility Model Publication No. 55-147811 International Publication No. 2005/61077 Pamphlet

The cylindrical filter element as shown in Patent Document 2 generally holds the outer periphery of a pleated filter cloth with a band at an appropriate interval. Therefore, the cylindrical filter element ensures the durability of the pleated filter cloth by preventing the pleated filter cloth from excessively expanding during backwashing.

However, the cylindrical filter element is disposed inside the dust collector so that the axial direction is substantially vertical so as to coincide with the direction in which the paint mist is sucked upward from below. For this reason, there exists a problem that it is difficult for the pre-coating material which generate | occur | produced dust to adhere toward the upper part of a pleated filter cloth. Further, since the cylindrical filter elements are arranged in the vertical direction, there is a problem that the precoat material is easily dropped from the surface of the pleated filter cloth at a location where the local wind speed is high. Furthermore, the cylindrical filter element has a problem that the paint particles easily adhere to the surface of the band.

On the other hand, the flat filter element as shown in Patent Document 3 is arranged inside the dust collector with the plane to be filtered oriented in a substantially vertical direction so as to intersect the direction of sucking the paint mist upward from below. Can be arranged. Therefore, the flat plate filter element can solve the problem that the precoated material generated by dust is less likely to adhere to the surface of the pleated filter cloth as compared with the cylindrical filter element.

In addition, the flat filter element according to Patent Document 3 changes the direction of air flow when pulsed air at the time of backwashing collides with a reinforcing member provided laterally, and greatly deflects the planar filter outward. . And the flat filter element by patent document 3 is able to amplify the effect which peels adhering dust at the time of backwashing (refer paragraph [0047] of patent document 3, and FIG. 4).

However, the flat filter element according to Patent Document 3 has the same problem as Patent Document 2 in that, when placed vertically, a precoat material such as calcium carbonate does not necessarily adhere uniformly to the surface of the pleated filter cloth.

There is also a commercially available flat plate filter element in which the surface of a pleated filter cloth is coated with a fluororesin, paying attention to the non-adhesiveness of the fluororesin to the paint particles and the high collection efficiency. However, there is a problem that the fluororesin coating is expensive. There is a need for a flat filter element having the same performance as the fluororesin coating, omitting the fluororesin coating.

Furthermore, in a commercially available flat filter element, even if pulsed air is sprayed from the inside, the initial precoat material such as calcium carbonate does not fall off and adheres to the surface of the pleated filter cloth, so that it can be protected from paint particles. It is said. In this case, there is little precoat material remaining on the surface of the pleated filter cloth, and there is a problem that it is not a substitute for a fluororesin coating having high tackiness and high collection efficiency. There is a need for a dust collector filter element and a dust collector that reliably protect the surface of a pleated filter cloth.

There is a need for a dust collector filter element and a dust collector for protecting a pleated filter cloth so that paint particles having strong adhesion do not adhere to the surface of the pleated filter cloth in a flat filter element using a precoat material. The above can be said to be the subject of the present invention.

The present invention has been made in view of such problems, and a filter element for a dust collector and a dust collector for protecting a pleated filter cloth so that paint particles having strong adhesion do not adhere to the surface of the pleated filter cloth are provided. The purpose is to provide.

The present inventor forms a first precoat layer by attaching a first precoat material such as fly ash having a predetermined particle size distribution to a pleated filter cloth in a flat filter element using a precoat material. It has been found that this problem can be solved by forming a second precoat layer by adhering a second precoat material such as calcium carbonate having excellent adsorptivity to the first precoat layer. The inventors have invented such a new filter element for dust collector and dust collector.

(1) The filter element for a dust collector according to the present invention has a precoat material attached to the filtration surface in order to prevent the paint particles from adhering to the filtration surface, captures the paint particles with the precoat material, The precoat material ejected on the filter surface and removed from the filter surface, the filter surface is arranged in a substantially vertical state, and the dust collector is arranged so that the extending direction of the soot formed substantially parallel to the filter surface substantially coincides with the horizontal direction. A filter element for a dust collector disposed inside a hollow flat plate-like retainer framed so as to include a pair of substantially rectangular planes that are opposed to each other so as to be open at both ends. A porous pleated filter medium that is disposed so as to cover the outer periphery of the retainer and forms a filtration surface provided with a bellows-like ridge in which mountain folds and valley folds are repeated in the circumferential direction; and A first cap member for fixing one end of the pleat filter medium, and closing the other end of the retainer. A second cap member for fixing the other end of the pleated filter medium, wherein the pleated filter medium is at least one selected from the group consisting of spherical particles having a predetermined particle size distribution, polyhedral particles, and flaky particles. A first precoat layer formed by adhering a first precoat material composed of two or more particles to the filtration surface in a substantially fixed state, and a second precoat material composed of flaky particles adsorbable on the paint particles are the first precoat layer. A second precoat formed by adhering to a precoat layer and capable of removing the second precoat material while spraying the pulsed air to leave the first precoat layer. And, with a.

The filter element for a dust collector according to the present invention attaches a precoat material to the filtration surface in order to prevent the paint particles from adhering to the filtration surface, and captures the paint particles with the precoat material. And the filter element for dust collectors by this invention can remove the precoat material adhering to the filtration surface by ejecting pulse air inside.

Further, the filter element for the dust collector according to the present invention is arranged inside the dust collector so that the filtration surface is arranged in a substantially vertical state, and the extending direction of the ridge formed substantially parallel to the filtration surface is substantially coincided with the horizontal direction. The And the filter element for dust collectors by this invention is equipped with the hollow flat retainer, the porous pleat filter material, the 1st cap member, and the 2nd cap member.

The first retainer is open at both ends. Moreover, the 1st retainer has opened many ventilation holes in the outer periphery containing a pair of substantially rectangular plane opposingly arranged so that it might adjoin. The pleated filter medium is disposed so as to cover the outer periphery of the first retainer. Further, the pleated filter medium forms a filtration surface provided with bellows-like ridges in which mountain folding and valley folding are repeated in the circumferential direction.

The first cap member is attached to one end of the first retainer. And the 1st cap member has opened the distribution port connected to the inside of the 1st retainer. The first cap member fixes one end of the pleated filter medium. The second cap member closes the other end of the first retainer. The second cap member fixes the other end of the pleated filter medium.

The pleated filter medium has a first precoat layer and a second precoat layer. In the first precoat layer, a first precoat material composed of at least one particle selected from the group consisting of spherical particles having a predetermined particle size distribution, polyhedral particles, and flaky particles is substantially fixed to the filtration surface. The first precoat layer formed by adhering and the first precoat material are formed by adhering to the filtration surface in a substantially fixed state. The second precoat layer is formed by adhering to the first precoat layer a second precoat material composed of flaky particles that can be adsorbed to the paint particles. In addition, the second precoat layer can remove the second precoat material while jetting pulsed air to leave the first precoat layer. The first precoat material is preferably composed of spherical particles or polyhedral particles having a predetermined particle size distribution.

The filter element for a dust collector according to the present invention attaches the second precoat material to the first precoat layer after adhering the dusted first precoat material to the filtration surface of the pleated filter medium in a substantially fixed state, thereby generating pulse air. The second precoat material can be removed while spraying to leave the first precoat layer, and the filtration surface of the pleated filter medium can be protected by the first precoat layer from paint particles having strong adhesion that has not been adsorbed to the second precoat material. .

(2) It is preferable that the spherical particles constituting the first precoat material are fly ash.

Commercially available fly ash can be used for the first precoat material. The fly ash preferably has a particle size adjusted using a classifier, and for example, fly ash having an average particle size of 18 μm can be used. Since fly ash is formed in a spherical shape, it can cover the filtration surface of the pleated filter medium with a predetermined porosity, and coat the first precoat layer in a substantially fixed state with fly ash having an appropriate particle size distribution. The second precoat material can be attached to the first precoat layer. Although fly ash is spherical, polyhedral particles can also be used as the first precoat material.

(3) The flaky particles constituting the first precoat material are preferably calcium carbonate.

The first precoat layer can use the same calcium carbonate as the second precoat material as long as the pressure loss of the filter element is allowed to increase, and carbon dioxide having a large particle size in order to reduce the pressure loss of the filter element as much as possible. Calcium can also be used.

(4) The second precoat material is preferably calcium carbonate.

As particles that can be adsorbed to the paint particles, it is preferable to use calcium carbonate, which is flake (flakes) -like particles having a large surface area compared to the volume.

(5) A dust collector according to the present invention is a dust collector including the filter element for a dust collector according to any one of (1) to (4), and a filter storage chamber in which paint particles are supplied toward the pleated filter medium, A precoat material ejection pipe disposed inside the filter housing chamber for generating a precoat material toward the pleated filter medium, a first exhaust duct communicating with a flow port of the first cap member, and the first cap A pulsed air ejection pipe for ejecting pulsed air toward the distribution port of the member.

The dust collector according to the present invention has a filter storage chamber and a precoat material ejection pipe. The filter accommodating chamber is supplied with paint particles having high adhesion toward the pleated filter medium. The precoat material ejection pipe is disposed inside the filter housing chamber, and dusts the precoat material toward the pleated filter medium. The dust collector according to the present invention has a first exhaust duct and a pulsed air ejection pipe. The first exhaust duct communicates with the flow port of the first cap member. The pulsed air ejection pipe ejects pulsed air toward the flow port of the first cap member.

(6) It is preferable that the pressure loss of the dust collector filter element is regulated to about 100 Pa to 500 Pa so that the first precoat layer does not fall off from the filtration surface.

By prescribing the pressure loss of the filter element for the dust collector to 100 Pa or more and 500 Pa or less, it is possible to prevent the first precoat layer from falling off from the filtration surface of the pleated filter medium.

(7) When the pressure loss of the filter element for a dust collector increases, it is preferable to reduce the pressure of the pulse air.

When the pressure loss of the filter element for the dust collector is increased, the first precoat layer can be prevented from falling off from the filtration surface of the pleated filter medium by reducing the pressure of the pulsed air.

(8) The dust collector according to the present invention further includes an air blow device that removes the first precoat material and the second precoat material remaining on the pleated filter medium, wherein the air blow device is a filter element for the dust collector that is disposed to face the dust collector. An air blow pipe that is arranged in a substantially vertical state and moves in parallel with the direction in which the ridges of the filtration surface extend, and that opens a jet outlet for jetting compressed air toward the plane of the pleated filter medium, and the second cap An air box disposed separately from the member and connected to a compressed air source; one or more connecting rods having one end portion movably connected to the air box and the other end fixed to the air blow pipe; One or more spiral air hoses with one end connected to the compressed air source through the air box and the other end connected to the air blow pipe. .

The dust collector according to the present invention further includes an air blowing device. The air blower can be installed in the dust collector during maintenance without being permanently installed in the dust collector. And an air blower can remove the 1st precoat material and the 2nd precoat material which remain in the pleat filter material with which the filter element for dust collectors is equipped. The air blow device has an air blow pipe and an air box. The air blow pipe is arranged in a substantially vertical state between the filter elements for the dust collector arranged opposite to each other. The air blow pipe moves in parallel with the direction in which the wrinkles of the filtration surface extend, and opens a jet outlet for jetting compressed air toward the plane of the pleated filter medium. The air box is spaced apart from the second cap member and is connected to a compressed air source.

The air blow device has one or more connecting rods and one or more spiral air hoses. The connecting rod is movably connected at one end to the air box. The connecting rod has the other end fixed to the air blow tube. The spiral air hose has one end connected to a compressed air source via an air box. The spiral air hose has the other end connected to the air blow tube.

The dust collector according to the present invention includes a first precoat material remaining in a plurality of pleat filter media disposed opposite to each other by moving between the filter elements for the dust collector disposed opposite to each other while the air blow pipe ejects compressed air. The second precoat material can be removed all at once. And the filter element for dust collectors can be reproduced | regenerated.

(9) The air blow pipe has a length corresponding to two or more stages of the pleated filter medium among the plurality of filter elements for the dust collector arranged in a height direction, and the air box includes the connecting rod. It is preferable that they are connected so as to be movable up and down.

In the dust collector according to the present invention, since the air blow pipe has a length corresponding to two or more pleated filter media, a plurality of pleat filter media arranged opposite to each other and arranged in two or more stages in the height direction are provided. 1st precoat material and 2nd precoat material which remain | survive can be removed collectively.

(10) It is preferable that the air box is arranged so as to be movable in a row direction in which the filter elements for the dust collector are arranged to face each other.

(11) a second exhaust duct that exhausts the first precoat material and the second precoat material removed from the pleat filter medium; and a manually switchable first damper that opens and closes an exhaust port of the first exhaust duct. It is preferable to further include a manually-switchable second damper that opens and closes the exhaust port of the second exhaust duct.

When the air blower is operating, it is preferable to close the first damper and open the second damper to exhaust the first precoat material and the second precoat material removed from the pleat filter medium from the second exhaust duct. .

In the dust collector according to the present invention, the air blow pipe moves between the filter elements for the dust collector arranged opposite to each other while jetting the compressed air, so that the first precoat material remaining in at least a plurality of the pleat filter media arranged opposite to each other. And the 2nd precoat material can be removed collectively. And the filter element for dust collectors can be reproduced | regenerated.

It is a perspective view which shows the structure of the filter element for dust collectors by one Embodiment of this invention. It is a figure which shows the structure of the filter element for dust collectors by the said embodiment, FIG. 2 (A) is a front view, FIG.2 (B) is a top view, FIG.2 (C) is a right view, FIG. ) Is a longitudinal sectional view showing an enlarged main part, and describes dimensions according to the embodiment. It is a perspective exploded view which shows the structure of the filter element for dust collectors by the said embodiment. It is a figure which shows the structure of the retainer with which the filter element for dust collectors by the said embodiment is equipped, FIG.4 (A) is a front view of a retainer, FIG.4 (B) is a top view of a retainer, FIG.4 (C) is FIG. It is a right view of a 1st retainer. It is a front view which shows the structure of the dust collector by one Embodiment of this invention. It is a top view which shows the structure of the dust collector by the said embodiment. FIG. 3 is a vertical step view of the air blow device provided in the dust collector according to the embodiment as viewed from the right side.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Configuration of filter element for dust collector]
Initially, the structure of the filter element for dust collectors by one Embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing a configuration of a filter element for a dust collector according to an embodiment of the present invention. FIG. 2 is a diagram showing a configuration of a filter element for a dust collector according to the embodiment, FIG. 2 (A) is a front view, FIG. 2 (B) is a plan view, and FIG. 2 (C) is a right side view. FIG. 2D is a longitudinal cross-sectional view in which a main part is enlarged, and describes dimensions according to the embodiment.

FIG. 3 is a perspective exploded view showing the configuration of the filter element for the dust collector according to the embodiment. 4A and 4B are diagrams showing a configuration of a retainer provided in the filter element for a dust collector according to the embodiment. FIG. 4A is a front view of the retainer, FIG. 4B is a plan view of the retainer, and FIG. C) is a right side view of the first retainer.

Referring to FIG. 1, a filter element for a dust collector (hereinafter abbreviated as a filter element) 10 according to an embodiment of the present invention has a filtration surface for filtering dust contained in gas arranged in a substantially vertical state. Further, the filter element 10 is disposed inside a dust collector 100 to be described later so that the extending direction of the ridge formed substantially parallel to the filtration surface substantially coincides with the horizontal direction.

1 to 4, the filter element 10 includes a hollow flat plate-like retainer 1 and a porous pleated filter medium 2. The filter element 10 includes a first cap member 3 and a second cap member 4.

Referring to FIG. 3 or FIG. 4, the retainer 1 is open at both ends. Moreover, the retainer 1 is framed so that it may include a pair of substantially rectangular planes arranged to face each other so as to be close to each other. Referring to FIG. 1 or FIG. 2, the pleated filter medium 2 is arranged so as to cover the outer periphery of the retainer 1. Further, the pleated filter medium 2 forms a filtration surface provided with a bellows-like ridge 2b in which mountain folding and valley folding are repeated in the circumferential direction.

1 or 2, the first cap member 3 is attached to one end of the retainer 1. The first cap member 3 opens an oval circulation port 3 h communicating with the inside of the retainer 1. The first cap member 3 has one end of the pleated filter medium 2 fixed with an adhesive B. On the other hand, the second cap member 4 closes the other end of the retainer 1. The second cap member 4 has the other end of the pleated filter medium 2 fixed with an adhesive B.

Referring to FIG. 1 or FIG. 2, the retainer 1 has a plurality of ring-shaped frame members 1s. The frame member 1 s has an outer surface 1 b that can be bonded to the inner wall of the pleated filter medium 2 on the outer wall. These frame members 1s are arranged at a predetermined interval from one end portion of the retainer 1 toward the other end portion. And these retainers 1 adhere | attach the bottom part of the valley of the pleat filter medium 2 using the adhesive agent B. FIG.

Furthermore, referring to FIGS. 2 to 4, the retainer 1 has two plate-like ribs 1p. These plate-like ribs 1p extend in the longitudinal direction inside the retainer 1. These plate-like ribs 1p reinforce the retainer 1 by being joined to the plurality of frame members 1s from the inside.

Referring to FIG. 3, the retainer 1 can have a length L of about 120 cm. The retainer 1 can have a height H of about 18 cm. Further, the retainer 1 can have a width W of about 2 cm. The filter element 10 according to the embodiment can provide a thin flat plate filter element (see FIG. 1).

[Operation of filter element for dust collector]
Next, the operation and effect of the filter element 10 will be described while supplementing the configuration of the filter element 10 according to the embodiment.

Referring to FIG. 1, the filter element 10 is supported at both ends by, for example, a pair of frames (not shown) standing inside a dust collector 100 described later. Another filter element 10 can be arranged in the upper stage of the filter element 10 shown in FIG. 1, and another filter element 10 can be arranged in the lower stage of the filter element 10 shown in FIG. 1 (FIG. 7). reference). Further, another filter element 10 can be arranged in parallel before and after the filter element 10 shown in FIG. 1 (see FIG. 7).

Referring to FIG. 1, the filter element 10 has dust supplied to the inside of a dust collector 100 to be described later by setting the inside of one frame (not shown) supporting the first cap member 3 to a negative pressure. Can be filtered.

In addition, referring to FIG. 1, a pulse air ejection pipe 140 is arranged inside one frame (not shown) that supports the first cap member 3, and pulse air Pa is blown into the filter element 10. Thus, dust adhering to the filtration surface of the pleated filter medium 2 can be removed. That is, the filter element 10 can be backwashed. In order to maintain airtightness between the first cap member 3 and one frame (not shown), it is preferable to attach an annular packing 3p to the end face of the first cap member 3 (FIG. 2 ( C)).

Referring to FIG. 3 or FIG. 4, the retainer 1 is arranged such that the space between the frame members 1 s is closer to the closing side than the opening side of the retainer 1. As a result, the pulsed air Pa (see FIG. 1) blown into the retainer 1 can be released from the outer periphery of the pleated filter medium 2 with a substantially uniform wind pressure.

Referring to FIG. 3 or FIG. 4, the retainer 1 is preferably molded from a synthetic resin to obtain a framed hollow flat plate-like main body 11. The main body 11 may form a metal plate. The molded main body 11 includes plate-like ribs 1p. The frame member 1s and the plate-like rib 1p are preferably formed of a synthetic resin. The retainer 1 may be the main body 11 by joining the frame member 1s and the plate-like rib 1p, or the main body 11 by integrally molding the frame member 1s and the plate-like rib 1p.

Referring to FIG. 2 or FIG. 3, the pleated filter medium 2 can be a polyester nonwoven fabric imparted with air permeability. A commercially available polyester nonwoven fabric in which polyester fibers are randomly welded in order to impart air permeability can be used. A sheet-like polyester nonwoven fabric can be thermoformed to provide a bellows-like ridge 2b in which mountain folds and valley folds are repeated. Next, this polyester nonwoven fabric is formed into a rounded rectangle and both ends are heat-welded, whereby the pleated filter medium 2 whose outer periphery is closed as shown in FIG. 2 can be obtained. In addition, even if it is the same volume, the surface area of a filtration surface can be increased by providing the filter medium with the bellows-like ridge 2b in which mountain folding and valley folding are repeated.

Referring to FIG. 3, after the pleated filter medium 2 whose outer periphery is closed is bonded to the outer walls of the plurality of frame members 1 s, the first cap member 3 and the second cap member 4 are bonded to both ends of the pleated filter medium 2. Thus, the filter element 10 can be completed.

Referring to FIG. 3, the filter element 10 is formed by bonding a plurality of frame members 1 s formed on the outer wall with an outer surface 1 b that can be bonded to the inner wall of the pleated filter medium 2 to the pleated filter medium 2 via the adhesive B. Since it is joined to the pleated filter medium, the rigidity of the filter element 10 can be enhanced, and the amount of deflection of the pleated filter medium 2 can be reduced. Thereby, the filter element 10 can extend the lifetime of the filter element 10 even if the filtration process and the backwashing process are alternately repeated.

Referring to FIG. 1, a precoat material ejection pipe 120 is disposed on the second cap member 4 side of the filter element 10 (see FIG. 5). The precoat material P can be adhered to the filtration surface of the pleat filter medium 2 by dusting the precoat material P from the precoat material ejection pipe 120 toward the filter element 10 and sucking the filter element 10 (see FIG. 3). And by adhering paint particles having strong adhesion to the precoat material P attached to the pleat filter medium 2, it is possible to prevent the paint particles from adhering to the filtration surface of the pleat filter medium 2 and clogging.

However, the filter element 10 has a problem that the precoat material P does not necessarily adhere uniformly to the filtration surface of the pleated filter medium 2. As a result, even if the paint particles partially adhere to the filtration surface of the pleat filter medium 2 and the backwashing pulse air Pa is ejected from the inside of the filter element 10, the paint particles are separated from the filtration surface of the pleat filter medium 2. There was a problem of not peeling.

Referring to FIG. 1, a filter element 10 according to an embodiment has a first precoat material Pf such as fly ash made of spherical particles or polyhedral particles having a predetermined particle size distribution in a substantially fixed state on a filtration surface of a pleated filter medium 2. A first precoat layer P1 is formed by adhering, and a second precoat material Pc made of flaky particles such as calcium carbonate having excellent adsorbability of coating particles is attached to the first precoat layer P1, and the first precoat layer P1 is formed. It has been found that this problem can be solved by forming the second precoat layer P2 capable of removing the second precoat material Pc while leaving the layer P1 remaining.

Referring to FIG. 1, first precoat layer P <b> 1 is formed on the filtration surface of pleated filter medium 2 by dusting first precoat material Pf such as fly ash from precoat material ejection pipe 120 toward filter element 10. Yes (see FIG. 2B). In this case, the first precoat material Pf can be formed in a substantially fixed state with the first precoat material Pf substantially fixed to the filtration surface of the pleat filter medium 2 by continuing to suck the first precoat material Pf for a predetermined time, that is, by aging. . The first precoat layer P1 is preferably laminated with a thickness of about 80 g / square m and an average thickness of about 100 μm.

Next, referring to FIG. 1, the second precoat layer P1 is formed on the first precoat layer P1 by dusting the second precoat material Pc such as calcium carbonate from the precoat material ejection pipe 120 toward the filter element 10. The layer P2 can be formed (see FIG. 2B). In this case, since the spherical particles or polyhedral particles having a predetermined particle size distribution are stacked in the first precoat material Pf, the first precoat material Pf is not sucked into the filter element 10 and from the voids between the spherical particles or polyhedral particles. The second precoat material Pc can be sucked.

Next, referring to FIG. 1, the paint particles are supplied and sucked by the filter element 10, so that the paint particles are captured by the second precoat material Pc without reaching the filtration surface of the pleated filter material 2. The

Next, referring to FIG. 1, the pulsed air Pa is injected into the filter element 10 to remove the second precoat material Pc that has captured the paint particles while leaving the first precoat layer P1. In this case, the first precoat layer P1 has high air permeability, and it is possible to prevent the first precoat layer P1 from falling off by injecting the pulsed air Pa while the filter element 10 has a low pressure loss of about 100 Pa to 500 Pa. On the other hand, since the second precoat material Pc is attached to the first precoat layer P1 in a floating state, the second precoat material Pc that has captured the paint particles can be removed while the first precoat layer P1 remains.

Referring to FIG. 2, it is considered that the factor that can prevent the first precoat layer P1 from falling off depends on the shape and size of the pleated filter medium 2. Referring to FIG. 2D, by setting the distance between the valleys of the pleated filter medium 2 to about 5.2 mm and the depth of the valley of the pleated filter medium 2 to about 15.5 mm, the pulsed air Pa interferes with each other between the valleys. Even if there is an instantaneous movement of the first precoat material Pf with the pulse air Pa of about 0.1 sec, it is considered that the first precoat layer P1 can be prevented from falling off as a result because it is attracted by a negative pressure.

The filter element 10 according to the embodiment attaches the second precoat material Pc to the first precoat layer P1 after attaching the dusted first precoat material Pf to the filtration surface of the pleated filter material 2 in a substantially fixed state. The second precoat material Pc can be removed while the first precoat layer P1 is left by spraying the pulsed air Pa, and the filtration surface of the pleat filter medium 2 from the highly adherent paint particles that are not adsorbed to the second precoat material Pc. Can be protected by the first precoat layer P1.

[Example]
Filter performance was tested using the filter element 10 having the shape shown in FIGS. The pleated filter medium 2 having a length of 1200 mm and a surface area of 2.6 m ² was used. Further, the pleated filter medium 2 was subjected to a comparative test using a fluororesin-coated one and a non-fluororesin-coated one.
For the pleated filter medium 2, the product number “G2260-1S” of “Axta (trade name)” manufactured by “Toray Industries, Inc.” was used. “Acsta” is a polyester nonwoven fabric for pleated filters.

The main characteristics of the product number “G2260-1S” are as follows.
Tensile strength (N / 5cm) length: 1265
Tensile strength (N / 5cm) width: 730
Burst strength (kgf / cm ² ): 27
Weight per unit area (g / m ² ): 260
Thickness (mm): 0.61
“Acsta” manufactured by “Toray Industries, Inc.” is said to have 10 to 30% higher collection performance in the dust particle size range of 3.0 to 5.0 μm than the conventional polyester felt.

"G2260-SUS" with "G2260-1S" of "Acsta" manufactured by "Toray Industries, Inc." and "G2260-TF" with "G2260-1S" membrane laminated (fluorine resin coating) And “G2260-1S + Pf + Pc” in which the first precoat material Pf and the second precoat material Pc were adhered to the surface of “G2260-1S”. The results are shown in [Table 1].

Referring to Table 1, in the case where the surface of the pleat filter medium 2 is coated with a fluororesin, and in the case where the first precoat material Pf and the second precoat material Pc are attached to the surface of the pleat filter medium 2 as in the present invention, It can be seen that there is no inferiority at the submicron level in the collection efficiency of dust.

As the first precoat material Pf, two types of fly ash having a 45 μm sieve residue of 40% or less of the fly ash specified in JIS shown in Table 2 were used.

The logarithmic graph of Table 3 shows the measurement results of the particle size distribution of the two fly ash used in the present invention. The horizontal axis of the graph in Table 3 indicates the particle size (μm) of fly ash, the vertical axis on the left of the graph in Table 3 indicates the appearance rate for each particle size, and the vertical axis on the right of the graph in Table 3 indicates The rate of increase in appearance for each particle size is shown.

Table 4 shows the data of Table 3. Referring to Table 4, the rate of increase in appearance for each particle size accounts for 10% of the total number until the particle size is 2.7888 (μm), and accounts for 95% until the particle size is 93.838 (μm). You can see that In addition, the peak value of the appearance rate for each particle diameter is 34.492 (μm) as the median, and the width is 53.522 (μm), accounting for about 60% of the total number, and 4.6375 (μm) is the median. It can be seen that the width of 6.2576 (μm) occupies about 37.5% of the total number.

A filter element 10 having a pleat filter medium 2 using “Axta G2260-1S” manufactured by “Toray Industries, Inc.” is installed in a dust collector 100 described later, and two types of fly ash are deposited on the surface of the pleat filter medium 2 at 80 g / m ^2. As described above, the dust collector 100 was operated for about 2 hours under the condition that the pressure loss of the filter element 10 was about 500 Pa. As a result, the porosity of the two types of fly ash decreased, and the first precoat layer P1 in a so-called tightened state (substantially fixed state) could be realized. In addition, it was confirmed that the first precoat layer P1 did not fall off from the surface of the pleated filter medium 2 with pulsed air Pa that would remove the second precoat layer P2. In the embodiment, it is considered that the weight of the first precoat material Pf is about 60 to 80 g / m ² . In the actual dust collector 100, the pulse air Pa operates with a surface area of 2.6 m ² per filter element 10 with an air amount of 3 to 5 NL, a pulse time of 0.1 sec, and a pulse cycle time of about 10 min. did. The second precoat layer P2 was removed by the pulse air Pa and the expansion (deformation) of the surface of the pleated filter medium 2.

In addition, using “Acsta G2260-1S” manufactured by “Toray Industries, Inc.” as a sample filter, the difference in pressure loss due to the presence or absence of fluororesin coating was verified. In addition, the sample filter was 0.5 m / min similarly to the passing air volume of the filter element 10 by embodiment. The verification results are shown in Table 5.

Referring to Table 5, when the sample filter had no fluororesin coating, the pressure loss was about 30 Pa. On the other hand, when the sample filter had a fluororesin coating, the pressure loss was about 130 Pa. It is thought that the pressure loss was increased by covering the surface of the filter with a thin film of fluororesin.

By the way, referring to Table 5, when the first precoat layer (fly ash) and the second precoat layer (calcium carbonate) were adhered to the sample filter without the fluororesin coating, the pressure loss was about 100 Pa. The average particle size of calcium carbonate was 17 μm.

Referring to Table 5, the difference in pressure loss was 100 Pa as compared with the sample filter having the fluororesin coating. Thus, the filter element 10 according to the embodiment has an advantage that it can be operated with a low pressure loss, as compared with a filter having a fluororesin coating, by pre-coating the filtration surface with two layers. However, the filter element according to the present invention does not necessarily deny that the filtration surface is coated with fluororesin. There is no denying the merit of filtering finer dust even with expensive fluororesin coatings.

[Configuration of dust collector]
Next, the configuration of the dust collector according to one embodiment of the present invention will be described. FIG. 5 is a front view showing the configuration of the dust collector according to the embodiment of the present invention. FIG. 6 is a plan view showing the configuration of the dust collector according to the embodiment. FIG. 7 is a vertical step view of the air blow device provided in the dust collector according to the embodiment as seen from the right side.

5 to 7, the dust collector 100 according to the embodiment of the present invention includes a filter storage chamber 110 and a precoat material ejection pipe 120. The filter housing chamber 110 is supplied with paint particles toward the pleated filter medium 2. The precoat material ejection pipe 120 is disposed inside the filter housing chamber 110. The precoat material ejection pipe 120 can dust the precoat material P toward the pleat filter medium 2. Further, the precoat material P ejected from the precoat material ejection pipe 120 circulates so as to convect inside the filter housing chamber 110 after dropping. Further, the precoat material P can be collected in a hopper (not shown) disposed at the lower part of the filter housing chamber 110 and supplied to the precoat material ejection pipe 120.

5 to 7, the dust collector 100 includes a first exhaust duct 130 and a pulsed air ejection pipe 140. The first exhaust duct 130 communicates with the flow port 3h of the first cap member 3 (see FIG. 1 or FIG. 2). The pulsed air ejection pipe 140 can eject pulsed air Pa toward the flow port 3 h of the first cap member 3.

Referring to FIG. 5, a coating booth (not shown) is arranged on the upper portion of the dust collector 100. The paint mist can flow down from this painting booth. Referring to FIG. 6, the dust collector 100 has four filter storage chambers 110. That is, the dust collector 100 is partitioned into four filter storage chambers 110.

Referring to FIG. 5, the first exhaust duct 130 is connected to an air conditioner (not shown). And it becomes ventilation air ventilated with this air conditioner, is supplied to the painting booth, and is further circulating to the filter storage chamber 110.

Referring to FIG. 1 or FIG. 5, an air conditioner (not shown) sets the air volume so that the wind speed of the exhaust air passing through the pleated filter medium 2 of the filter element 10 is about 0.5 m / min. Thereby, the pressure loss of a filter can be reduced compared with the conventional dust collector which made the passing wind speed of a filter about 1.0 m / min. In the embodiment shown in FIG. 1 or FIG. 5, it is possible to prevent the first precoat layer P1 from falling off from the filtration surface of the pleated filter medium 2 by regulating the pressure loss of the filter element 10 to 100 Pa or more and 500 Pa or less.

5 to 7, in the filter housing chamber 110, the filter elements 10 are arranged in six stages in the height direction. In the filter housing chamber 110, the filter elements 10 are arranged in six rows in the depth direction. That is, 36 filter elements 10 are arranged in the filter housing chamber 110. The

adjacent filter elements

10 and 10 are provided with a predetermined gap, and an air blow pipe 51 described later can move (see FIG. 6).

5 to 7, the precoat material ejection pipe 120 is connected to a precoat material ejection device (not shown) disposed at the lower part of the dust collector 100. The precoat material ejection device mainly includes a blower, and can transport the precoat material P supplied from a hopper (not shown) to the precoat material ejection pipe 120. The precoat material ejection pipe 120 has an ejection port opened for each row of the filter elements 10, and can eject the precoat material P toward the filter element 10.

5 to 7, the pulsed air ejection pipe 140 is connected to a compressed air source (not shown). By opening and closing an electromagnetic switching valve (not shown) provided on the base end side of the pulse air ejection pipe 140, the pulse air Pa can be ejected from the pulse air ejection pipe 140 into the filter element 10 or stopped. In the embodiment, the second precoat material Pc that captures the paint particles while vibrating the pleated filter medium 2 and leaving the first precoat layer P1 by ejecting pulsed air Pa into the filter element 10 every predetermined time. Can be dismissed.

5 to 7, when the pressure loss of the filter element 10 increases, it is preferable to reduce the pressure of the pulse air Pa, and a pressure adjusting valve (not shown) provided on the base end side of the pulse air ejection pipe 140. ) Can be realized.

(Configuration of air blow device)
Next, the configuration of the air blow device 5 provided in the dust collector 100 will be described. Referring to FIGS. 5 to 7, the dust collector 100 according to the embodiment includes an air blowing device 5. The air blow device 5 can be installed in the dust collector 100 during maintenance without being permanently installed in the dust collector 100. And the air blow apparatus 5 can remove the 1st precoat material Pf and the 2nd precoat material Pc which remain | survive in the pleat filter medium 2 (refer FIG. 2).

5 to 7, the air blow device 5 has an air blow pipe 51 and an air box 52. The air blow pipe 51 is disposed in a substantially vertical state between the

filter elements

10 and 10 disposed to face each other. In addition, the air blow pipe 51 moves in parallel with the direction in which the wrinkles of the filtration surface extend, and opens a jet outlet for jetting compressed air toward the plane of the pleated filter medium 2. The air box 52 is spaced apart from the second cap member 4 and is connected to a compressed air source (not shown).

5 to 7, the air blowing device has a pair of connecting

rods

53 and 53 and a pair of

spiral air hoses

54 and 54. One end of the connecting rod 53 is movably connected to the air box 52. The connecting rod 53 has the other end fixed to the air blow pipe 51. One end of the spiral air hose 54 is connected to a compressed air source (not shown) via the air box 52. The spiral air hose 54 has the other end connected to the air blow pipe 51.

5 to 7, the spiral air hose 54 is wound around the connecting rod 53. When the connecting rod 53 advances and retracts in the substantially horizontal direction with respect to the air box 52, the spiral air hose 54 can be expanded and contracted. The air blow pipe 51 can eject compressed air toward the plane of the pleated filter medium 2. As the air blow pipe 51, for example, “Curtain Transvector (trade name)” manufactured by Nijie Co., Ltd. can be used. The “curtain transvector” is formed in the shape of a long band plate, and compressed air can be uniformly ejected from a flat thin slit provided on the side surface thereof.

Referring to FIG. 5 or FIG. 6, the air box 52 is provided with a plurality of wheels 52w on the bottom surface. And the air box 52 can move the channel | path 111 provided in the center part of the dust collector 100. FIG. Thus, the air box 52 is arranged so as to be movable in the row direction in which the

filter elements

10 and 10 are arranged to face each other. The air box 52 can move the air blow pipe 51 up and down in the height direction via a pair of connecting rods 53. That is, the air box 52 connects the connecting rod 53 so as to be movable up and down.

5 or 6, the dust collector 100 further includes a second exhaust duct 150, a first damper 13d, and a second damper 15d. The second exhaust duct 150 is connected to an air conditioner (not shown). The second exhaust duct 150 can exhaust the first precoat material Pf and the second precoat material Pc removed from the pleat filter medium 2 (see FIG. 2).

Referring to FIG. 5 or FIG. 6, the first damper 13 d can be manually switched and can open and close the exhaust port of the first exhaust duct 130. When the first damper 13d is opened, the filter element 10 can be exhausted, and when the first damper 13d is closed, the exhaust of the filter element 10 can be stopped. The second damper 15d can be manually switched and can open and close the exhaust port of the second exhaust duct 150. When the second damper 15d is opened, the filter housing chamber 110 can be evacuated, and when the second damper 15d is closed, the exhaust of the filter housing chamber 110 can be stopped.

(Operation of air blow device)
Next, the operation and effect of the air blowing device 5 will be described while explaining the operation of the air blowing device 5 according to the embodiment. First, referring to FIG. 5 or FIG. 6, the side plate 11 p that has sealed the side surface of the filter housing chamber 110 is removed, and the air blowing device 5 is installed. Next, the air box 52 is manually moved and stopped at a predetermined position. Next, a hand switch (not shown) connected to the air box 52 is operated to eject the compressed air toward the plane of the pleated filter medium 2 while moving the air blow pipe 51 in the horizontal direction.

Referring to FIGS. 5 to 7, the air blow pipe 51 has a length corresponding to the pleat filter medium 2 in three stages, so that the pleats are arranged opposite to each other and arranged in three stages in the height direction. The first precoat material Pf and the second precoat material Pc remaining on the plurality of soot of the filter medium 2 can be collectively removed.

Next, referring to FIG. 5 to FIG. 7, after the removal operation of the first precoat material Pf and the second precoat material Pc of the upper three-stage pleated filter medium 2 is completed, the upper three-stage pleated filter medium 2 The removal operation is repeated as described above. And after the removal operation | work of the pleat filter medium 2 of a predetermined | prescribed row | line | column is complete | finished, it moves to the following row | line | column and starts the removal operation | work of the pleat filter media 2.

Referring to FIG. 5 or FIG. 6, when the air blowing device 5 is operating, the first damper 13d is closed and the second damper 15d is opened to remove the first precoat material Pf removed from the pleat filter medium 2 and The second precoat material Pc is preferably exhausted from the second exhaust duct 150.

Since the air blow device 5 according to the embodiment facilitates the removal operation of the first precoat material Pf and the second precoat material Pc in a narrow space and can remove the first precoat material Pf and the second precoat material Pc from the pleat filter medium 2, The filter element 10 can be regenerated without being removed from the dust collector 100.

The present invention discloses a filter element for a dust collector and a dust collector that are suitable for filtering paint particles having strong adhesion and collecting these paint particles, but the particles to be filtered are not limited to paint particles. Other particles with strong adhesion can also be filtered.

DESCRIPTION OF SYMBOLS 1 Retainer 2 Pleated filter medium 2b Bellows bowl 3 1st cap member 3h Distribution port 4 2nd cap member 10 Filter element (filter element for dust collectors)
100 Dust collector P1 First precoat layer P2 Second precoat layer Pa Pulse air Pf First precoat material Pc Second precoat material

Claims

In order to prevent the paint particles from adhering to the filtration surface, a precoat material is adhered to the filtration surface, the paint particles are captured by the precoat material, and a precoat material adhered to the filtration surface by ejecting pulsed air inside. The filter element for the dust collector is disposed inside the dust collector so that the filter surface is disposed in a substantially vertical state and the extending direction of the soot formed substantially parallel to the filter surface is substantially coincident with the horizontal direction. And
A hollow flat plate-like retainer framed to include a pair of substantially rectangular planes that are open at both ends and opposed so as to be close to each other;
A porous pleated filter medium that is arranged so as to cover the outer periphery of the retainer and forms a filtration surface provided with a bellows-like ridge in which mountain folds and valley folds are repeated in the circumferential direction;
A first cap member attached to one end of the retainer, opening a flow port communicating with the interior of the retainer, and fixing one end of the pleat filter medium;
A second cap member that closes the other end of the retainer and fixes the other end of the pleated filter medium;
The pleated filter medium is
A first precoat material comprising at least one or more particles selected from the group consisting of spherical particles having a predetermined particle size distribution, polyhedral particles, and flaky particles is formed by adhering to the filtration surface in a substantially fixed state. A first precoat layer;
The second precoat material is formed by adhering to the first precoat layer, a second precoat material composed of flaky particles adsorbable on the paint particles, and spraying the pulse air to leave the first precoat layer. A filter element for a dust collector, comprising: a second pre-coat layer capable of removing water.
The filter element for a dust collector according to claim 1, wherein the spherical particles constituting the first precoat material are fly ash.
The filter element for a dust collector according to claim 1 or 2, wherein the flaky particles constituting the first precoat material are calcium carbonate.
The filter element for a dust collector according to any one of claims 1 to 3, wherein the second precoat material is calcium carbonate.
A dust collector provided with the filter element for a dust collector according to any one of claims 1 to 4,
A filter housing chamber in which paint particles are supplied toward the pleated filter medium;
A precoat material ejection pipe disposed inside the filter housing chamber and generating a precoat material toward the pleated filter medium;
A first exhaust duct communicating with the flow port of the first cap member;
A dust collector comprising: a pulsed air ejection pipe that ejects pulsed air toward the flow port of the first cap member.
6. The dust collector according to claim 5, wherein a pressure loss of the dust collector filter element is regulated to about 100 Pa to 500 Pa so that the first precoat layer does not fall off from the filtration surface.
The dust collector according to claim 6, wherein when the pressure loss of the filter element for the dust collector is increased, the pressure of the pulse air is decreased.
An air blower for removing the first precoat material and the second precoat material remaining on the pleat filter medium;
The air blowing device is
A jet port that is arranged in a substantially vertical state between the filter elements for the dust collector that are arranged opposite to each other, moves in parallel with the direction in which the ridges of the filtration surface extend, and jets compressed air toward the plane of the pleated filter medium. An open air blow tube,
An air box disposed apart from the second cap member and connected to a compressed air source;
One or more connecting rods, one end of which is movably connected to the air box and the other end is fixed to the air blow pipe;
8. The dust collector according to claim 5, further comprising: one or more spiral air hoses having one end connected to the compressed air source via the air box and the other end connected to the air blow pipe.
The air blow pipe has a length corresponding to two or more stages of the pleated filter medium among the plurality of filter elements for the dust collector arranged in the height direction,
The dust collector according to claim 8, wherein the air box connects the connecting rods so as to be movable up and down.
10. The dust collector according to claim 8 or 9, wherein the air box is arranged to be movable in a row direction in which the filter elements for the dust collector are arranged to face each other.
A second exhaust duct for exhausting the first precoat material and the second precoat material removed from the pleat filter medium;
A manually switchable first damper that opens and closes an exhaust port of the first exhaust duct;
The dust collector according to any one of claims 8 to 10, further comprising a manually switchable second damper that opens and closes an exhaust port of the second exhaust duct.