KR102041713B1 - Filter bag for dust collector and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a filter bag for a dust collector and a manufacturing method thereof which do not reduce the efficiency of exhaustion even if the number of exhaustion is accumulated by effectively maintaining a wrinkled shape of the filter bag without relying on a processing of resin impregnation, a processing of the mixing of hot melt fibers, or a processing of sewing. For the above, the filter bag for a dust collector the present invention comprises: filter cloth of a cylindrical shape; an inlet unit which is provided on the top of the filter cloth and is coupled with a snap ring of which the outer diameter is reduced when pressed from the outside; and a bottom unit which closes the bottom of the filter cloth. The filter cloth is formed in a wrinkled shape by a plurality of wrinkled shape retainers coupled at intervals in a longitudinal direction. The wrinkled shape retainers are formed by being molded in a form of repeating waveforms in a mold while a circular metal support is fixated on an outer circumferential surface of the filter cloth.

Description

Filter bag for dust collector and its manufacturing method {FILTER BAG FOR DUST COLLECTOR AND MANUFACTURING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter bag for a dust collecting device which can effectively form and maintain a pleated shape of a filter bag without relying on resin impregnation processing, mixing processing of a heat melting fiber, or sewing processing, and the like, and a manufacturing method thereof.

In a manufacturing plant such as cement, fiber, chemistry, or a metal processing plant, a dust collector is essentially used to prevent environmental pollution caused by exhaust gas, fine dust, industrial waste, etc. emitted during manufacturing or processing.

In general, the dust collector is formed with an inlet for sucking contaminated air in the lower part, an outlet for discharging filtered clean air to the outside is formed, and a cell plate for blocking and partitioning the inside of the dust collector up and down, and a cell plate. It consists of a plurality of filter insertion holes formed in the filter bag, a filter bag mounted in the filter insertion hole, and a retainer inserted in the filter bag to maintain the shape of the filter bag.

Conventional filter bags are formed in a cylindrical shape having a smooth outer circumferential surface, and a method of fabricating a pleated structure to improve the dust collection efficiency by increasing the surface area is proposed.

On the other hand, when fabrication of the filter bag using a filter cloth having a low rigidity such as a needle punch nonwoven fabric, since the material is soft, the wrinkle shape cannot be maintained as it is. Therefore, the method of fixing a wrinkle shape by impregnating a thermosetting resin in a filter cloth and shape | molding a wrinkle under heating (patent document 1: Unexamined-Japanese-Patent No. 2004-160381) is performed. However, impregnation of the thermosetting resin deteriorates the performance of the filter cloth, which is not preferable in terms of filtering efficiency.

As another method for fixing and maintaining the wrinkle shape, a method of imparting a predetermined supporting force by mixing a heat-melting fiber, that is, a thermosetting fiber or a thermoplastic fiber, into a non-woven fabric or fabric without using a thermosetting resin and then bending it into a wrinkle shape. It is proposed (Patent Document 2: Republic of Korea Patent Publication No. 10-2017-0001977). However, it is very difficult in terms of process and cost to manufacture a separate filter fabric by mixing heat-melting fibers in a nonwoven fabric or fabric, and to improve wrinkle retention.

As a wrinkle shape maintaining method which does not depend on resin processing, the technique which employ | adopted the sewing attachment structure is proposed (patent document 3: Unexamined-Japanese-Patent No. 2009-011989, patent document 4: Korea Patent Publication No. 10-2012-). 0123173). Sewing method is preferable in terms of filtering efficiency because it does not deteriorate the performance of the filter cloth, but as the number of dedusting increases, wrinkle recovery and dedusting efficiency decreases, and sewing work itself is not easy, so it is very disadvantageous in terms of manufacturing process and cost. There is this.

Japanese Patent Publication No. 2004-160381 (June 10, 2004) Republic of Korea Patent Publication No. 10-2017-0001977 (published Jan. 6, 2017) Japanese Patent Publication No. 2009-011989 (published Jan. 22, 2009) Republic of Korea Patent Publication No. 10-2012-0123173 (2012. 11. 8. disclosure)

An object of the present invention is to provide a filter bag for a dust collector that can effectively form and maintain a pleated shape without depending on the resin impregnation processing, the mixing processing of the fiber for heat melting, or the sewing attachment method.

In order to achieve the above object, the present invention is provided with a cylindrical filter cloth, the inlet portion is coupled to the upper end of the filter cloth and the outer ring is reduced when the outside pressure is reduced, and the bottom portion to close the bottom of the filter cloth In the filter bag for dust collector, the filter cloth is pleated by a plurality of pleat-shaped retainers coupled at intervals along the longitudinal direction, the pleat-shaped retainer is a circular metal support to the filter cloth The present invention provides a filter bag for a dust collecting device, which is formed by molding a waveform in a shape of repeating wave undulation with a mold while fixed to an outer circumferential surface thereof.

In this case, the filter cloth is formed by connecting a plurality of unit filters by sewing along the longitudinal direction, each one of the pleat-shaped retainer may be coupled to the longitudinal middle portion of the unit filter cloth.

In addition, the diameter of each of the pleat-shaped retainer can be formed relatively larger toward the lower side from the upper side of the filter cloth.

In addition, the corrugated retainer may be formed in the form of a wire or a band having a predetermined width.

In addition, the metal support is positioned on the outer circumferential surface of the filter cloth, it may be fixed to the filter cloth by sewing after the reinforcement cloth is wrapped around the outer side of the metal support.

In addition, the present invention comprises the steps of preparing a plurality of unit filters of the cylindrical shape; Positioning a circular metal support on an outer circumferential surface of the longitudinal middle portion of each unit filter cloth, and wrapping and reinforcing a reinforcement cloth to fix the cloth by sewing; Using a mold to form the metal support into a corrugated shape retainer having a shape of repeating wave ups and downs; Forming a filter cloth by stitching each unit filtration cloth forming a pleat shape by the pleated shape retainer along a lengthwise direction; And forming an inlet by combining a snap ring whose outer diameter is reduced when pressed from the outside to a longitudinal upper end of the filter cloth, and forming a bottom part by closing the longitudinal lower end thereof. Provide a method.

At this time, the diameter of each of the pleated retainer may be formed relatively larger toward the lower side from the upper side of the filter cloth.

In addition, the corrugated retainer may be formed in the form of a wire or a band having a predetermined width.

The filter bag for the dust collector according to the present invention is easy to manufacture because it does not need to process the resin impregnating process or the mixing or sewing process of the heat-melting fibers for the filter cloth has the advantage that can reduce the production cost accordingly. In addition, there is an advantage that the dust removal efficiency does not decrease even if the number of times of exhaustion is increased because of excellent pleat shape retention and restoring power of the filter bag. Furthermore, according to one embodiment of the present invention, the filter bag for the dust collector can be formed in a shape in which the inside becomes wider from the upper side to the lower side. In this case, the air pressure transmitted to the filter bag during the air pulsation for dust removal is overall. Since it can be evenly distributed, there is an advantage of extending the life of the filter bag as well as uniform exhaustion.

1 is a perspective view of a filter bag according to an embodiment of the present invention.
2 is a view showing a process of forming a wrinkle on the unit filter cloth.
3 is a diagram illustrating the shape of a wrinkle-like retainer.
4 is a diagram illustrating a waveform relief formed on the wrinkle-like retainer.
5 is a view showing a process of forming a filter cloth by connecting the unit filter cloth.
6 is a schematic side cross-sectional view of a filter bag according to an embodiment of the present invention.
7 is a perspective view of a filter bag according to another embodiment of the present invention.
8 is a schematic side cross-sectional view of the filter bag according to FIG. 7.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

1 is a perspective view of a filter bag according to an embodiment of the present invention, and FIG. 6 is a schematic side cross-sectional view of the filter bag 100.

The filter bag 100 for a dust collector according to the present invention is a cylindrical bag-shaped filter cloth 10 having a predetermined length, the inlet 20 provided on the upper end of the filter cloth 10, the lower end of the filter cloth 10 It is coupled to the bottom portion 30, the filter cloth (10) provided includes a pleated shape retainer (40 ') for forming and maintaining a pleated shape in the filter cloth (10).

The filter cloth 10 is made of non-woven fabric or woven fabric, and a retainer (not shown) is inserted and disposed therein. The inlet portion 20 is provided with a metallic snap ring 22 having elasticity in which the outer diameter is reduced when pressed from the outside by the cloth (fabric) of the inlet portion. The snap ring 22 is coupled to the insertion hole or the retainer (not shown) when the filter bag 100 is inserted into each of the plurality of filter insertion holes formed in the cell plate for blocking and partitioning the inside of the dust collector.

The filter cloth 10 can be formed in a predetermined length by arranging a plurality of unit filter cloths (11, 12, 13) having a cylindrical shape along the length direction, and connecting adjacent unit filter cloths (11, 12, 13) by sewing. have. 5 illustrates a process of forming the filter cloth 10 having a predetermined length by connecting the unit filters 11, 12, 13. In the example of the figure shows a process of connecting the three unit filters 11, 12, 13 for the convenience of understanding, but the number of unit filters is not limited to this, and appropriately to obtain a filter cloth 10 having a predetermined length Can be adjusted. Reference numeral S in FIG. 5 denotes seams of connecting portions of the unit filters 11, 12 and 13. As illustrated in FIG. 5, one pleat-shaped retainer 40 'is coupled to the longitudinal middle portion of each unit filter cloth 11, 12, 13.

Bottom portion 30 serves to close the lower end of the filter cloth (10).

The inlet portion 20 and the bottom portion 30 are made of a nonwoven fabric or a woven fabric like the filter cloth 10, and are sewn and coupled to the filter cloth 10.

The filter cloth 10 is formed by the plurality of pleat-shaped retainers 40 'which are spaced apart from each other along the longitudinal direction to form and maintain the pleats. The number and mutual spacing of the pleated retainers 40 'coupled to the filter cloth 10 may be appropriately adjusted according to the length and the need of the filter cloth 10.

On the other hand, the corrugated retainer 40 'is formed by molding a circular ring or a circular band-shaped metal support 40 having a predetermined width in a shape of repeating wave undulation using a mold (not shown).

As shown in FIG. 2, first, a cylindrical unit filter cloth 11 is prepared, and then a ring-shaped metal support 40 is fitted to the outer peripheral surface of the longitudinal middle portion of the unit filter cloth 11. Thereafter, the reinforcing cloth 50 having a predetermined width is covered with the outer side of the metal support 40 and fixed to the unit filter cloth 11 by sewing, and then the metal support 40 is corrugated ups and downs using a mold (not shown). It is formed into a repeating shape retaining body 40 '. The reinforcement cloth 50 may be made of a nonwoven fabric or a woven fabric like the filter cloth 10. The seam of the reinforcement cloth 50 and the filter cloth 10 is shown by the reference numeral S 'of FIG.

For example, after inserting the unit filter cloth 11, the metal support 40 is fixed to the column-shaped male mold formed by the regular waveform up and down on the outer circumferential surface, the male mold from the outside of the unit filter cloth 11 The metal support 40 can be molded into a pleated retainer 40 'in the form of repeating wave ups and downs by pressurizing with a female mold corresponding to the shape.

As the metal support 40 coupled to the unit filtration cloth 11 is formed into a pleat-shaped retainer 40 'having a repeating wave shape, the unit filtration cloth 11 has a pleat-shaped retainer 40' as a center. Corrugations are formed and maintained partly or entirely along the longitudinal direction.

The nonwoven fabric or woven fabric used to fabricate the filter cloth lacks rigidity and cannot form and maintain a pleat shape by itself. Therefore, in the related art, the fabric of the filter cloth is impregnated with a thermosetting resin, and after the formation of the pleats, it is heated to a thermosetting temperature, or a non-woven fabric or fabric mixed with thermosetting fibers or thermoplastic fibers is used as the fabric of the filter fabric, and then heat treated A method of forming and fixing a wrinkle shape or adopting a sewing attachment structure to form and fix a wrinkle shape has been used.

As described above, the conventional wrinkle formation and fixing method has problems such as a decrease in filtering efficiency, difficulty and complexity of the process, and an increase in cost.

The present invention for solving the above problems, by using a mold after fixing the metal support 40 to the unit filter cloth 11 without depending on the resin impregnation processing, the mixing processing of the heat-melting fibers, or the sewing attachment method, etc. By forming the corrugated retention body 40 'in the form of repeating the wave undulation, it is possible to easily and effectively form and maintain the pleats with respect to the filter cloth 10 made of a nonwoven fabric or a woven fabric that lacks rigidity.

3 is a view illustrating the shape of the pleat-shaped retainer 40 '. As shown in (a) of FIG. 3, the corrugated retainer 40 ′ may be formed in a wire shape, and has a wave-shaped relief using a metal support 40 having a circular band (strap) shape having a predetermined width. It can be formed in a (strap) form (see FIG. 3B).

4 is a view showing various examples of the wave shape formed on the corrugated retention body 40 '. The waveform is preferably formed to repeat the sine wave-shaped relief, but is not limited thereto, and may be formed to repeat the undulation of the trapezoidal wave and the triangular wave shape. In addition, the pitch of the wave shape, the height of the peak part, the depth of the bent part, the value of the bent part R of the peak part and the bent part, etc. can be appropriately selected, changed and applied as necessary.

7 is a perspective view of a filter bag 100 according to another embodiment of the invention, and FIG. 8 is a schematic side cross-sectional view of the filter bag 100 according to FIG. 7. As illustrated in the figure, the diameters d1, d2, d3 of the pleated retainer 40 ′ fixed to each unit filtration cloth may be formed relatively larger from the upper side to the lower side of the filter cloth 10 (ie, , d3> d2> d1). In this case, the filter bag 100 has a shape that becomes wider from the upper side to the lower side.

The white arrows in FIG. 8 schematically show the flow of air and the relative pressure magnitudes during air pulsing. As shown in the figure, in general, when air pulsing using high pressure compressed air for dedusting and cleaning the filter cloth 10, the pressure of air delivered to the lower side of the filter cloth 10 is relatively decreased. Because of this large difference in the dust removal force of the upper, middle, and lower portion of the filter cloth 10 tends to be not uniformly exhausted.

In addition, the lower side of the filter bag 100 subjected to strong air pressure during air pulsing may be relatively easily damaged or broken. In order to solve this problem, as shown in FIGS. 7 and 8, when the filter bag 100 is formed in a shape that is wider from the upper side to the lower side, the air pressure transmitted to the filter bag 100 during air pulsing is measured. Since it can be distributed evenly throughout, there is an advantage that can extend the life of the filter bag 100 as well as uniform exhaustion.

The manufacturing method of the filter bag 100 for dust collectors which concerns on this invention consists of the following steps.

1) preparing a plurality of cylindrical unit filters 11, 12, 13;

2) inserting the circular metal support 40 into the outer peripheral surface of the longitudinal middle portion of each unit filter cloth (11, 12, 13) and padding the reinforcing cloth (50) to fix by sewing;

3) forming the metal support 40 into a corrugated shape retainer 40 'in the form of repeating wave ups and downs using a mold;

4) forming a filter cloth (10) by connecting each unit filter cloth (11, 12, 13) forming a pleated shape by the pleated retainer (40 ') by sewing along the longitudinal direction; And

5) the upper end of the filter cloth 10 in the longitudinal direction is combined with a snap ring 22 to reduce the outer diameter when pressed from the outside to form the inlet portion 20, the longitudinal bottom is closed to form the bottom portion 30 step;

At this time, the diameter of each of the pleated retainer 40 'can be formed relatively larger from the upper side to the lower side of the filter cloth 10, the pleated retainer 40' is in the form of a wire or a predetermined width It can be formed in the form of a band having.

As described above, the filter bag 100 for the dust collecting device according to the present invention is easy to manufacture because there is no need for the resin impregnation processing or the mixing or sewing processing of the heat-sealing fibers for the filter fabric 10 and accordingly the production cost There is an advantage to reduce, and the filter bag 100 has excellent advantages in maintaining and restoring the pleat shape has an advantage that the dedusting efficiency does not decrease even if the number of exhaustion increases. In addition, when the filter bag 100 for the dust collector is formed in a shape where the inside becomes wider from the upper side to the lower side, the air pressure transmitted to the filter bag 100 during air pulsation can be evenly distributed as a whole, so that uniform exhaustion is achieved. Of course, there is an advantage that can extend the life of the filter bag (100).

Although several embodiments of the present invention have been shown and described above, it will be apparent to those skilled in the art that the present invention may be modified without departing from the spirit or spirit of the present invention. There will be. Therefore, the scope of the present invention is not limited to the described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention, and such modifications or variations will be said to belong to the scope of the present invention. .

10: filter cloth
11, 12, 13: Unit Filtration
20: entrance
22: snap ring
30: bottom
40: metal support
40 ': crimp retaining
50: reinforcement
100: filter bag
S, S ': seam

Claims (8)

In the filter bag for dust collector comprising a cylindrical filter cloth, the inlet portion is coupled to the upper end of the filter cloth, the outer ring is reduced when the outside pressure is reduced, and the bottom portion closing the lower end of the filter cloth,
The filter cloth is formed in a pleated shape by a plurality of pleated shape retainer coupled at intervals along the longitudinal direction,
The pleated retainer is formed by molding a circular metal support on the outer circumferential surface of the filter cloth in such a manner as to repeat the waveform ups and downs with a mold. The method according to claim 1,
The filter cloth is formed by connecting a plurality of unit filters by sewing along the longitudinal direction,
Dust bag filter bag, characterized in that each one of the pleat-shaped retainer is coupled to the longitudinal middle portion of the unit filter cloth. The method according to claim 2,
The diameter of each of the pleated retainer, the filter bag for dust collector, characterized in that to form a relatively larger from the upper side to the lower side of the filter cloth. The method according to claim 1,
The pleated retainer is a filter bag for dust collector, characterized in that formed in the form of a wire or band having a predetermined width. The method according to claim 1,
The metal support is placed on the outer circumferential surface of the filter cloth, the reinforcing cloth is padded on the outer side of the metal support and wrapped and sewn and fixed to the filter cloth, characterized in that fixed to the filter cloth. Preparing a plurality of cylindrical filter cloths having a cylindrical shape; Positioning a circular metal support on an outer circumferential surface of the longitudinal middle portion of each unit filter cloth, and wrapping and reinforcing a reinforcement cloth to fix the cloth by sewing; Using a mold to form the metal support into a corrugated shape retainer having a shape of repeating wave ups and downs; Forming a filter cloth by stitching each unit filtration cloth forming a pleat shape by the pleated shape retainer along a lengthwise direction; And forming an inlet by combining a snap ring whose outer diameter is reduced when pressed from the outside to a longitudinal upper end of the filter cloth, and forming a bottom part by closing the longitudinal lower end thereof. Way. The method according to claim 6,
The diameter of each of the pleated retainer, the manufacturing method of the filter bag for dust collector, characterized in that the larger forming from the upper side to the lower side of the filter cloth. The method according to claim 6,
The pleated retainer is a method of manufacturing a filter bag for dust collector, characterized in that formed in the form of a wire or a band having a predetermined width.

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