JPH10230121A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively separate dust stuck to a filter element which is assembled by using a pleated filter. SOLUTION: A plurality of pieces of filter elements are constituted by holding pleated filters, in which folded width is made large, in a cylindrical shape and incorporating a spacer consisting of a perforated plate into the inside face thereof. The lower end parts of the filter elements are stopped by a filter pad provided in a filter base. Element cones are provided in the insides of the respective filter elements. The upper-end opening parts of the respective filter elements are stuck to the filter guides 35 through filter packings 36 by pulling up the above filter case by a cylinder. Simultaneously, a guide cone 37 is fitted between the upper ends of the adjacent filter elements. Large-diameter nozzles fitted with air pulse solenoid valves 39 are arranged just above the respective filter guides 35. The respective nozzles are connected to an air tank 41 through air feed pipes 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a dust collector.

[0002]

2. Description of the Related Art In a dust collector, a filter 43 formed by pleating a sheet-like filter material as shown in FIG. As shown in FIG. 10, dust 45
Are clogged and seized, an effective filter area cannot be ensured, and the peaks 46 of the filter 43 are compressed by the filtration air pressure, which also causes a problem that the filter area decreases. In FIG. 9, reference numeral 47 denotes a porous plate formed into a cylindrical shape.

[0003]

Therefore, as a method of eliminating clogging of the pleated filter due to dust, conventionally, a method of transmitting vibration to the pleated filter by a knocker or the like, or a method of reducing the air pressure of an air pulse by a nozzle having a diameter of about 2 to 3 mm is used. A method was used in which the back flow was applied instantaneously to the inside of the pleated filter. However, because the pleated filter was formed of a hard material, vibration did not work effectively, and even in the case of back flow, the filter area was large. Because of this, it was weak and clogging regeneration ability was weak.

As a solution to such a problem, the fold width of the pleated filter is set to, for example, 30 mm to 40 mm.
mm, and the folding pitch is, for example, 12 mm.
Although the method of making it rough is adopted,
You will have to sacrifice the filter area. Also, in the application of fine particles such as fine ceramics, the air pulse backflow cleaning effect is lost because the air permeability of the filter surface is reduced. The present invention instantaneously releases a large amount of compressed air from a large-diameter nozzle toward a filter guide covering an upper end opening of each filter element to generate a shock wave exceeding the speed of sound, that is, a strong compression wave. It is an object of the present invention to provide a dust collector capable of effectively removing dust adhering to the outer surface of a filter by transmitting the light to the inside of each filter element through a filter guide and simultaneously reflecting the dust on the inner surface of the filter by an element cone. Things.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides a rigid pleated filter having a large folded width, which is supported in a cylindrical shape, and a wire mesh or other wire along the inner surface of the filter. The lower ends of a plurality of filter elements incorporating spacers consisting of perforated plates are connected by a filter pan provided at the intersection of each plate piece in a filter base consisting of long and thin plate pieces connected to cross each other vertically and horizontally. In the inside of each filter element, an element cone is provided inside the filter element from the lower side to the upper side, and the filter base is pulled up by a cylinder, so that the upper opening of each filter element is brought into close contact with the filter guide via the filter packing. At the same time, between the upper ends of adjacent filter elements,
A guide cone is fitted, and a large-diameter nozzle equipped with an air pulse solenoid valve is arranged directly above each of the above filter guides. Each nozzle is connected to an air tank that stores compressed air via an air supply pipe. The feature is that it does.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An adhesive is put into a concave portion of a bottom plate formed so as to have an annular concave portion around a circular plate, a folding width is increased, and a lower end of a rigid pleated filter formed into a cylindrical shape is provided. And the lower end of a spacer made of a wire mesh or other perforated plate incorporated in the inner surface of the filter is seated in the recess, and is adhered to the recess by the adhesive, and the upper end of the pleated filter is connected to the upper end of the filter. An adhesive is put into a concave portion of a cover formed to have an annular concave portion to be covered along the upper end portion of the spacer, and the upper end portion of the filter and the upper end portion of the spacer are fitted into the concave portion, and the adhesive is inserted. The lower end of the cylinder is closed by the bottom plate,
Assemble the filter element with the upper end of the filter opened by the inner diameter of the cover.

A plurality of lower ends of the filter element are received by a circular filter pan fixed to an intersection of the plate pieces in a filter base formed by connecting elongated plate pieces so as to intersect vertically and horizontally. Inside each filter element, a hollow element cone is provided from the lower side to the upper side. The upper end of each guide rod, which is provided upright from an appropriate position on the filter base, is connected to each cylinder provided downward, and the filter base is raised by the operation of each cylinder, whereby the upper end of each filter element is raised. At the same time, the opening is airtightly fitted to the filter guide via the filter packing, and at the same time, a guide cone is fitted between the upper ends of adjacent filter elements to stably support each filter element.

A large-diameter nozzle equipped with an air pulse solenoid valve is disposed directly above each of the filter guides.
Each nozzle is connected to an air tank storing compressed air via an air supply pipe.

In the dust collector having the above configuration, the amount of dust adhering to each filter element increases as the operation time elapses. Therefore, the operation of the dust collector is stopped, the air pulse solenoid valve is operated, and a large amount of compressed air is instantaneously discharged from each large-diameter nozzle toward each filter guide. Then, a shock wave exceeding the speed of sound, that is, a powerful compression wave, propagates from the upper part to the lower part in each filter element through each filter guide, and at the same time,
This compression wave is reflected by each element cone and effectively irradiates the inner surface of each filter element, so that the dust adhering to the outer surface of each filter element is separated,
Clogging and occupancy of each filter element due to dust are completely eliminated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. Reference numeral 1 denotes a dust collector, which is assembled by using, for example, 24 filter elements 2 as shown in FIG. Use the one provided. As shown in FIG. 2, each filter element 2 is filled with an adhesive, for example, an epoxy resin 6, in a concave portion 4 of a bottom plate 5 formed to have an annular concave portion 4 around the circular plate 3 to increase the folding width. In addition, the lower end of the hard pleated filter 7 formed into a cylindrical shape and the lower end of the spacer 8 made of a wire mesh incorporated along the inner surface thereof are seated in the recess 4, and the recess 4 is made of epoxy resin 6. The cover 10 is formed so as to have an annular concave portion 9 adhered along the upper end of the filter 7 and the upper end of the spacer 8.
The epoxy resin 11 is put into the concave portion 9 of the filter, and the upper end of the filter 7 and the upper end of the spacer 8 are fitted into the concave portion 9 and adhered into the concave portion 9 by the epoxy resin 11, so that the lower end of the filter 7 is The upper end of the filter 7 is opened by the inner diameter of the cover 10, and the filter 7 is assembled by winding a band 13 around the outer periphery of the filter 7. The filter 7 is made of, for example, a hard material such as polyester nonwoven fabric, ceramic, foamed plastic, or foamed metal, and has an outer diameter of 325 mm, an inner diameter of 200 mm, a length between upper and lower ends of 913 mm, and a fold width of 60 mm ( The filter is 1.5 times to 2 times as large as the conventional pleated filter.) The filter has a folding pitch of 7 mm and a filter area of 13.5 m ² per filter.

Reference numeral 14 denotes a filter base, which connects elongated plate sides 15 so as to intersect vertically and horizontally as shown in FIGS. 3 to 5, and at the intersection thereof, is formed on the lower surface of the bottom plate 5 of each filter element 2. Circular filter pans 17 each having a diameter that fits snugly in the recess 16
Are fixed by welding, and a guide rod 19 that stands upright from the center of the support plate 18 connected to four places at equal intervals from the center of the base 14 is provided. Each filter element 2 is supported upright from above the filter base 14 by fitting the recess 16 of each bottom plate 5 into each filter tray 17 of the filter base 14. 2
Numeral 0 is a hollow iron plate element cone provided to stand upright from the inner surface of the bottom plate 5 to the upper side inside each filter element 2, and a spacer 21 is interposed between the filter cone 7 and the inner surface of the filter 7. .

Reference numeral 22 denotes four air cylinders, which are beams 2 installed on the upper part of the dust collector 1 as shown in FIG.
3 are installed downward from positions corresponding to the four guide rods 19, and the lower ends of the pistons 24 are
As shown in FIG.
The upper end of the stud bolt 29 is connected to the joint 26 by a set screw 27 and a double nut 28,
At the lower end of the stud bolt 29, the upper end of a slide guide 32 inserted into a sleeve 31 fixed to a beam 30 erected at an intermediate portion in the dust collector 1 acts as a lock nut via a flat washer 33 also serving as a packing. Double nut 3
4 and the upper end of the guide rod 19 is connected to the slide guide 32. And each cylinder 22
8 raises the filter base 14, and FIG.
As shown in FIG.
The upper end opening 12 of each filter element 2 is airtightly adhered to each filter guide 35 fixed to a position corresponding to the upper end of the filter element 2 via each filter packing 36, and a guide cone 37 fixed to the beam 30 is formed. The operation of each cylinder 22 is stopped at a position fitted between the upper ends of the adjacent filter elements 2, and the double nut 34 is tightened to lock the filter base 14 at the above-mentioned raised position.
Is stably supported. The conventional filter area is 300
In the case of the m ² class dust collector, it took about one day to replace the filter element. However, in the mechanism in which the filter base 14 is pulled up by the air cylinder 22, the filter element can be replaced in about 30 minutes. The replacement work becomes very easy.

Reference numeral 38 denotes a large-diameter nozzle disposed directly above each filter guide 35, using a nozzle having a diameter of 32 mm.
Is attached. Each solenoid valve 39 is opened in sequence only for 100 ms, and a large amount of compressed air of 30 liters is supplied to each filter guide 3 by a pulse of 100 ms.
Release towards 5. This is equivalent to 110 times the air discharge by the conventional dust collector. As a result, a shock wave exceeding the speed of sound is generated as shown in Expression 1. Each nozzle 38
The compressed air is stored through the air supply pipe 40.
It is connected to an air tank 41 of 5 MPa.

[0014]

(Equation 1)

In the dust collector having the above configuration, a shock wave exceeding the speed of sound, that is, a strong compression wave propagates from the upper part to the lower part in each filter element 2 through the filter guide 35, and the compression wave is transmitted to each element cone 20. Since the light is reflected and is effectively irradiated to the inner surface of each filter element 2, the dust adhering to the outer surface of each filter element 2 is regenerated as powerful as to be scattered by 500 to 1000 mm. In FIG. 8, reference numeral 42 denotes a shock sensor.
G impact force is given. In the above embodiment, since 24 filter elements 2 are used, the total filter area is 324 m ² and the width of the dust collector 1 is 152
5mm, length 2375mm, height 3450
mm, but among the conventional dust collectors, a 329 m ² dust collector whose total filter area is close to the dust collector of the above embodiment uses 184 filter elements, the width of the dust collector is 2200 mm, and the longitudinal direction is , 520
Since the height of the dust collector is 0 mm and the height is 7480 mm, the dust collector of the above embodiment is reduced to about one-seventh in terms of volume ratio, and can be reduced in weight and size.

The present invention is not limited to the above-described embodiment, but can be modified as appropriate within the scope of the claims.

[0017]

The present invention is configured as described above, and has the following effects. The fold width of the pleated filter has been increased, and a spacer such as a wire mesh has been incorporated along the inner surface of the filter. Therefore, it is possible to prevent a decrease in air permeability due to the filtration pressure at the peaks on the outer surface of the filter, and to maintain the effective area of the filter. By instantaneously discharging a large amount of compressed air from a large-diameter nozzle toward the filter guide, a shock wave exceeding the speed of sound can be generated. This shock wave is a powerful compression wave, which is passed through each filter guide. By simultaneously propagating from the upper part to the lower part of each filter element and reflecting off each element cone and irradiating the filter inner surface effectively, dust adhering to the filter outer surface can be vibrated strongly and separated. it can. Since the filter base supporting each filter element is pulled up by the operation of the cylinder, it can be automatically positioned by the filter guide and the element cone, and each filter element can be set in close contact with the filter guide via the filter packing. In addition, this mechanism makes it possible to inspect and replace the filter very easily and reliably as compared with the conventional dust collector. Unlike the method of increasing the internal pressure of the filter and backflow, the shock wave acts on the filter, so the clogging regeneration method is powerful, and the clogging of filter valleys and dust with dust can be easily peeled off. The filter area can be reduced compared to a dust collector. In addition, it can handle fine powders such as carbon black and fine ceramics without difficulty, so it has a wide range of applications. It can handle wet powders such as dryers and fixed powders such as cement. Since the unit area of the filter can be increased, the volume of the dust collector can be reduced, the dust collector can be reduced in weight and size, the number of filters used can be reduced, the cost can be reduced, the failure can be reduced, and the dust collector can be provided easily. The comparison results in the following ratios (1)
Volume ratio Weight ratio Other molded filter type 60% 75% Cylindrical filter type 15% 20% Lightweight and compact, environmental dust collection with limited installation space and air transport separation filter at high places It is advantageous as It can also be mounted on vacuum vehicles. When transporting under pressure, the pressure vessel becomes smaller, so the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a dust collector according to the present invention.

FIG. 2 is a cross-sectional view in which a part of a filter element is cut away.

FIG. 3 is a bottom view of the filter base.

FIG. 4 is a side view of a filter base.

FIG. 5 is a plan view of a filter base.

FIG. 6 is a view showing a state where a filter base is connected to a cylinder.

FIG. 7 is a view showing an example of connection between a cylinder and a guide rod of a filter base.

FIG. 8 is a sectional view showing a state where each filter element is brought into close contact with a filter guide via a filter packing by a filter base.

FIG. 9 is a view showing a part of a pleated filter used in a conventional dust collector.

FIG. 10 is a diagram showing a state in which clogging due to dust occurs in the pleated filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust collector 2 Filter element 14 Filter base 15 Slender plate piece 17 Filter pan 19 Guide rod 20 Element cone 22 Air cylinder 35 Filter guide 36 Filter packing 37 Guide cone 38 Large diameter nozzle 39 Air pulse solenoid valve 40 Air supply pipe 41 Air tank

Claims (1)

[Claims] 1. A lower end portion of a plurality of filter elements which support a hard pleated filter having a large folding width in a cylindrical shape and incorporate a spacer made of a wire mesh or other perforated plate along an inner surface of the filter. Of the filter base, which is formed by connecting elongated plate pieces so as to cross each other vertically and horizontally, is received by the filter pan provided at the intersection of each plate piece, and inside each filter element, from the lower side to the upper side. An element cone is provided, and the filter base is lifted up with a syringe, so that the upper opening of each filter element is brought into close contact with the filter guide via the filter packing, and at the same time, a guide cone is placed between the upper ends of adjacent filter elements. The air pulse solenoid valve is fitted directly above each filter guide. A dust collector that has large-diameter nozzles equipped with, and each nozzle is connected to an air tank that stores compressed air through an air supply pipe.