WO2019098492A1

WO2019098492A1 - Filter bag for dust collector

Info

Publication number: WO2019098492A1
Application number: PCT/KR2018/008306
Authority: WO
Inventors: Jong Moon Kim; Dong Young Kim; Sang Mook Shin
Original assignee: EPiT Co., Ltd.
Priority date: 2017-11-16
Filing date: 2018-07-23
Publication date: 2019-05-23
Also published as: CN109794111A; KR101998373B1; CN109794111B; JP2019089057A; JP6853804B2; KR20190056092A

Abstract

A filter bag for a dust collector includes a filtration member, a band member and a plurality of reinforcing members. The filtration member is provided with pleats having pleat ridges and pleat valleys alternately arranged along a circumferential direction. The band member is provided along the circumferential direction to surround an outer surface of the filtration member and sewn to the pleat ridges and the pleat valleys. The reinforcing members are installed at the pleat valleys and extended along a longitudinal direction of the filtration member.

Description

FILTER BAG FOR DUST COLLECTOR

The present disclosure relates to a filter bag for a dust collector.

A dust collector is a type of purifier that removes dust such as solid or liquid fine particles contained in air or a gas (hereinafter generally referred to as "gas"). The dust collector may filter dust present in the gas and, then, may reintroduce the gas into a room or discharge the gas to the outside.

One or more dust collecting filters (hereinafter referred to as "filter bag") may be installed in the dust collector, and the filter bag may filter dust or the like contained in the gas and may supply a purified gas.

Generally, in the filter bag, a retainer may be provided inside a substantially cylindrical filter cloth to retain the filter cloth in a tubular shape. In recent years, in order to increase the dust collecting efficiency, the filter cloth of the filter bag has been repeatedly folded in the circumferential direction to form pleats, thereby increasing the surface area. The cylindrical filter bag may be formed by connecting the opposite ends of the filter cloth with pleats formed thereon.

Meanwhile, in the filter bag, dust adheres to the filter cloth thereof as time passes and rapidly increases the amount of pressure loss in the filter bag. Therefore, a dust removal operation to remove the dust adhered to the filter bag by air pulsing with compressed air, shaking or other methods is performed periodically.

In the dust removal operation through air pulsing, high-pressure compressed air is injected from the upper end of the filter bag toward the inside of the bag through a blow tube nozzle, thereby removing accumulated dust with the shock wave of the compressed air.

The conventional pleat filter bag for a dust collector is provided with a fiber-made or metal-made outer band on the outer circumferential surface of the filter bag to prevent the pleats from being excessively expanded by the compressed air during the dust removal operation through the air pulsing and to prevent the pleats from failing to restore the original state. The outer band is fixed to two or more pleat ridges, in conformity with the height thereof, among the respective portions of the pleats to hold the pleats.

However, the conventional filter bag as described above has a problem that during the air pulsing operation using compressed air, a part of the filter bag not fixed to the outer band rubs against the outer band, resulting in premature wear of the filter bag.

Further, in a conventional filter bag, there is a problem that when the dust drops from the upper portion of the filter bag, the outer band may break due to the friction or impact of the dust with the outer band.

Moreover, in a conventional filter bag, only the pleat ridges are fixed to the outer band. Therefore, the expansion of the filter bag is not properly controlled, which poses the problem that wear may occur due to the contact with an adjacent filter bag.

In addition, in the conventional filter bag, only the pleat ridges are fixed to the outer band, resulting in the disadvantage of having an uneven expansion of the pleats during the air pulsing operation using compressed air.

Embodiments of the present disclosure provide a filter bag for a dust collector capable of firmly fixing a band to a filter bag to reduce friction therebetween, thereby enhancing the durability of the filter bag and the band, preventing premature wear of the filter bag, and ensuring that pleats are uniformly maintained when the bag is inflated.

Furthermore, embodiments of the present disclosure provide a filter bag for a dust collector capable of preventing warpage of a filter bag by setting directions of pleats sewn to a band differently.

In accordance with an aspect of the present disclosure, there is provided a filter bag for a dust collector, including: a filtration member with pleats having pleat ridges and pleat valleys alternately arranged along a circumferential direction; and a band member provided along the circumferential direction to surround an outer surface of the filtration member and sewn to the pleat ridges and the pleat valleys.

The filter bag may further include a plurality of reinforcing members installed at the pleat valleys and extending along a longitudinal direction of the filtration member.

The pleat valleys may have accommodation portions for accommodating the reinforcing members.

The reinforcing members may be formed of circular columnar strings or band-shaped fabrics.

The band member may include a plurality of band members spaced apart from each other along the longitudinal direction of the filtration member.

The band members may be sewn to the filtration member so that the pleats sewn to adjacent band members are folded in opposite directions.

The reinforcing members may be formed of reinforcing fabrics installed on the entire outer surfaces of the pleat valleys to surround the entire outer surfaces of the pleat valleys.

The reinforcing members may be formed of reinforcing fabrics installed on a part of the outer surfaces of the pleat valleys to surround the part of the outer surfaces of the pleat valleys.

In accordance with another aspect of the present disclosure, there is provided a filter bag for a dust collector, including: a plurality of filtration members with pleats having pleat ridges and pleat valleys alternately arranged along a circumferential direction; a band member provided along the circumferential direction to surround outer surfaces of the filtration members and sewn to the pleat ridges and the pleat valleys; and a connecting strip sewn to a boundary portion of each of the filtration members to connect the filtration members to each other.

The filter bag may further include a plurality of reinforcing members installed at the pleat valleys and extending along a longitudinal direction of the filtration members.

The connecting strip may include an outer strip and an inner strip sewn to an outer surface and an inner surface of each of the filtration members, respectively.

The band member may include a plurality of band members spaced apart from each other along the longitudinal direction of the filtration members.

The band members may be sewn to the filtration members so that the pleats sewn to adjacent band members are folded in opposite directions.

According to the embodiments of the present disclosure, by firmly fixing the entire pleats of the filter bag and the band to reduce friction, it is possible to improve the durability of the filter bag and the band and to prevent premature wear of the filter bag or breakage of the band.

Furthermore, according to the embodiments of the present disclosure, it is possible to prevent the filter bag from being excessively expanded during the air pulsing operation, allow the upper and lower portions of the filter bag to expand evenly, and allow the pleats to restore the original state after air pulsing.

In addition, according to the embodiments of the present disclosure, it is possible to prevent the filter bag from being twisted by setting the directions of the pleats sewn to the band member differently.

Fig. 1 is a perspective view schematically showing a filter bag for a dust collector according to a first embodiment of the present disclosure.

Fig. 2 is a sectional plan view taken along line A-A in Fig. 1.

Fig. 3 is a sectional plan view taken along line B-B in Fig. 1.

Fig. 4 is a sectional plan view taken along line C-C in Fig. 1.

Figs. 5 and 6 are sectional plan views showing other examples of a reinforcing member.

Fig. 7 is an exploded perspective view schematically showing a filter bag for a dust collector according to a second embodiment of the present disclosure.

Fig. 8 is an assembled perspective view of the filter bag shown in Fig. 7.

Fig. 9 is a vertical sectional view taken along line D-D in Fig. 8.

Hereinafter, configurations and operations of embodiments will be described in detail with reference to the accompanying drawings. The following description is one of various patentable aspects of the present disclosure and may form a part of the detailed description of the present disclosure.

However, in describing the present disclosure, detailed descriptions of known configurations or functions that make the present disclosure obscure may be omitted.

The present disclosure may be modified and include various embodiments. Specific embodiments will be exemplarily illustrated in the drawings and described in the detailed description of the embodiments. However, it should be understood that they are not intended to limit the present disclosure to specific embodiments but rather to cover all modifications, similarities, and alternatives that are included in the spirit and scope of the present disclosure.

The terms used herein, including ordinal numbers such as "first" and "second" may be used to describe, and not to limit, various components. The terms simply distinguish the components from one another.

When it is said that a component is "connected" or "linked" to another component, it should be understood that the former component may be directly connected or linked to the latter component or a third component may be interposed between the two components.

Specific terms in the present disclosure are used simply to describe specific embodiments without limiting the present disclosure. An expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning in the context.

Hereinafter, a filter bag for a dust collector according to a first embodiment of the present disclosure will be described with reference to the accompanying drawings.

Referring to Fig. 1, a filter bag 10 for a dust collector according to the first embodiment of the present disclosure may include a filtration member 100, a band member 200 and a plurality of reinforcing members 300.

The expression that an embodiment of the present disclosure includes the above-listed components does not mean that the embodiment consists of only these components but means that the embodiment basically includes these components. The embodiment may further include other components (for example, components well-known in filter bags for dust collectors). However, the well-known components will not be described in detail because they may make obscure the gist of the present disclosure.

The filtration member 100 is a fabric used as material for a dust filter. The filtration member 100 may be provided with pleats 110 that are formed by successively folding the fabric to have a pitch along the circumferential direction.

Each of the pleats 110 may be composed of pleat ridges 111 and pleat valleys 112. The pleat ridges 111 and the pleat valleys 112 are continuously alternated along the circumferential direction X of the filtration member 100, thereby forming the pleats 110.

In this regard, the pleat ridges 111 may mean folded portions located at a relatively high position in the pleats 110, and the pleat valleys 112 may mean folded portions located at a relatively low position in the pleats 110.

The pleats 110 may be arranged to have a directionality in which the pleats 110 are folded in a specific direction of the circumferential direction of the filtration member 100 (hereinafter referred to as "folding direction"). The reason why the pleats 110 are arranged to have a folding direction will be described later.

In the filter bag 100 for a dust collector according to the present embodiment, as shown in Fig. 2, the filtration member 100 may be provided in a cylindrical shape so that a retainer 90 can be inserted inside the filtration member 100. However, the spirit of the present disclosure is not limited thereto. The shape of the filtration member 100 may be suitably changed as necessary.

The filtration member 100 may be a nonwoven fabric manufactured by a method of needle-punching a thermoplastic resin composed of a polymer material (e.g., PE, PP, PPS, NOMEX, PTFE (polytetrafluoroethylene) or the like) at a high temperature (180℃ to 260℃) or normal temperature (120℃ or less), a glass fiber fabric produced by a weaving method, or a specially surface-treated fiber material. The pleats 110 of the filtration member 100 may be formed using a pleat processing machine or the like that is well-known in the art.

For reference, a non-woven fabric is formed with short fibers or long fibers tangled with each other, and may be produced by a wet process, a spun bonding process, a span lacing process, a calender bonding process, a needle punching process or the like. In particular, a nonwoven fabric for room temperature use may be made of a material selected from the group consisting of polyester, acryl and polypropylene. A nonwoven fabric for high temperature use may be made of a material selected from the group consisting of polyamide, polyimide, polyamide imide, polyphenylene sulfide, poly sulfonamide, polytetrafluoroethylene (PTFE) and glass fiber.

The band member 200 is an element provided on the outer surface of the filtration member 100 in the shape of a band, which surrounds the filtration member 100 along the circumferential direction X of the filtration member 100. The band member 200 may be formed of an elastic material that is stretchable and contractible as needed. Thus, the band member 200 holds the reinforcing members 300 even when the filtration member 100 receives an external force. As a result, the band member 200 protects the pleats in order to restore the original shape.

Specifically, the band member 200 provides a structure for surrounding the outer circumferential surface of the filtration member 100 along the circumferential direction. Since the band member 200 is uniformly sewn to the pleat ridges 111 and the pleat valleys 112 when the band member 200 is fixed to the filtration member 100, the band member 200 may be entirely sewn to the pleats 110. At this time, the band member 200 may be sewn to the pleat ridges and the pleat valleys in a state in which the pleats 110 are folded in a direction.

In the filter bag 10 according to the present embodiment, the band member 200 is uniformly sewn to the entire pleats 110 through a sewing line 210 along the circumferential direction on the outer circumferential surface of the filtration member 100. Thus, the band member 200 may be fixedly installed to make close contact with the filtration member 100 with little space left between the band member 200 and the filtration member 100.

Accordingly, when the dust removal operation is performed by air pulsing, it is possible to solve the problem of the conventional band breaking due to the weight of the dust and the problem of the filter bag wearing out prematurely due to friction. When the filter bag is inflated, the filter bag as a whole is evenly held and the pleats are uniformly expanded, thus improving the dust removal performance of the filter bag.

In addition, as shown in Fig. 1, a plurality of band members 200 may be provided to enhance the local stiffness of the filtration member 100 and to enhance the effect of maintaining the pleat shape and protecting the pleats.

When the band members 200 are provided, they may be arranged to be spaced apart from each other along the longitudinal direction Y of the filtration member 100.

The band members 200 may be arranged at regular intervals along the longitudinal direction Y of the filtration member 100. If necessary, the band members 200 may be arranged at irregular intervals.

In this regard, the width of the band members 200 may be set to approximately 20 to 40 mm, and the interval between the band members 200 may be set to approximately 400 to 1000 mm in consideration of the pressure of pulsing air and the concentration and characteristics of dust.

Meanwhile, when the band members 200 are arranged to be spaced apart from each other along the longitudinal direction of the filtration member 100, the band members 200 may be sewn to the filtration member 100 so that the folding directions of the pleats 110 sewn to the two adjacent band members 200 are opposite to each other as shown in Figs. 3 and 4.

Accordingly, for example, if the pleats 110 sewn to one band member 200 (referred to as "first band member" for the sake of convenience) are folded to lie on the left, the pleats 110 sewn to another band member 200 (referred to as "second band member" for the sake of convenience) adjacent to the first band member 200 may be folded to the right.

The reason why the folding directions of the pleats 110 sewn to two adjacent band members 200 are set to be opposite to each other is to prevent the twisting of the filtration member 100 by the kinetic forces acting in opposite directions during the air pulsing operation.

For example, if the folding directions of the pleats 110 are all in the same direction, the filtration member 100 may be twisted in the folding direction of the pleats 110 by the high-pressure air during the dust removal operation, whereby the filtration member 100 may be twisted as a whole. However, if the folding directions of the pleats 110 are set to be opposite to each other for every adjacent band member 200 as in the present embodiment, the torsional rigidity of the filtration member 100 is increased. This makes it possible to prevent the filtration member 100 from being twisted during a high-pressure air pulsing operation. For reference, when the filtration member 100 is twisted and the pleats 110 are inclined, the inclined pleats may hinder the removal of dust and the dust may cause friction and wear of a fabric. This may shorten the lifespan of the filter bag.

As shown in Figs. 2 to 4, the reinforcing members 300 are installed at the pleat valleys 112 of the filtration member 100. The reinforcing members 300 may be located inward of the band member 200 and may extend along the longitudinal direction Y of the filtration member 100.

The reinforcing members 300 may impart rigidity to the pleat valleys 112 so that the filtration member 100 can maintain the corrugated shape for a long time.

The reinforcing members 300 extended in the longitudinal direction of the pleat valleys 112 are caught by the band member 200 when the pleat valleys 112 are pushed outward of the filtration member 100 by the high-pressure air during the air pulsing operation. Thus, it is possible for the reinforcing members 300 to prevent other portions of the filtration member 100 not sewn to the band member 200 from being excessively inflated. Further, after the air pulsing operation is completed, the pleat valleys 112 may be easily returned to the original state (original position) by the reinforcing members 300.

As shown in Fig. 2, the accommodation portions 112a may be formed in the vicinity of the pleat valleys 112 of the filtration member 100 so that the reinforcing members 300 can be installed in the pleat valleys 112. The accommodation portions 112a may be formed with accommodation spaces into which the reinforcing members 300 are inserted. The accommodation portions 112a may be formed by sewing on one side of the pleat valleys 112.

As shown in enlarged views on an example-by-example basis in Fig. 2, the reinforcing members 300 may be provided in the form of a string (piping string) having a circular columnar shape or a band-shaped fabric. The reinforcing members 300 may have a length corresponding to the total length of the filtration member 100.

In other words, the reinforcement member may be formed of a string having a circular columnar shape. Alternatively, the fabric of the filtration member 100 may be cut in a strip shape and may be bonded or fused to the pleat valleys 112, thereby increasing the support force of the pleat valleys 112 to reinforce the pleats 110.

Therefore, when the reinforcing members 300 are installed at the pleat valleys 112, the reinforcing members 300 are positioned inward of the band member 200 to maintain the pleat shape of the filtration member 100. When the pleat valleys 112 are expanded outward during the air pulsing operation, the band member 200 holds the reinforcing members 300 and supports all the pleat valleys 112 in the longitudinal direction. This may prevent the pleat valleys 112 from being excessively expanded outward from the band member 200 and may help the pleat valleys 112 restore the original state when the air pulsing operation is completed.

According to another embodiment of the present disclosure, as shown in Fig. 5, the reinforcing members 300 may be formed of reinforcing fabrics provided on the entire outer surfaces of the pleat valleys 112 to surround the entire outer surfaces of the pleat valleys 112. At this time, the reinforcing members 300 may be brought into contact with the entire outer surfaces of the pleat valleys 112 and may be sewn to the pleat valleys 112 along the sewing lines, thereby reinforcing the pleat valleys 112.

According to a further embodiment of the present disclosure, as shown in Fig. 6, the reinforcing members 300 may be formed of reinforcing fabrics provided on a part of the outer surfaces of the pleat valleys 112 to surround a part of the outer surfaces of the pleat valleys 112. At this time, the reinforcing members 300 may be brought into contact with only the part of the outer surfaces of the pleat valleys 112 and may be sewn to the pleat valleys 112 along sewing lines, thereby reinforcing the pleat valleys 112.

Hereinafter, a filter bag for a dust collector 20 according to a second embodiment of the present disclosure will be described with reference to Figs. 7 to 9.

As shown in Fig. 7, according to the second embodiment of the present disclosure, filtration members 100 having a certain length are connected to one another to manufacture a filter bag 100 having a length longer than the length of one filtration member 100. In general, the length of the filtration member 100 is set in advance and therefore, it is necessary to connect a plurality of filtration members 100 in order to manufacture a filter bag 20 having a length longer than the length of one filtration member 100.

The filter bag 20 for a dust collector according to the second embodiment of the present disclosure may include a plurality of filtration members 100, a band member 200, a plurality of reinforcing members 300 and a connecting strip 400.

The filtration members 100, the band member 200 and the reinforcing members 300 are the same in structure as those of the first embodiment described above. Therefore, redundant description thereof will be omitted. However, in the second embodiment of the present disclosure, two or more filtration members 100 may be used.

Hereinafter, the connecting strip 400 will be described. As shown in Figs. 7 and 8, a plurality of filtration members 100 are arranged to extend in the longitudinal direction. In this state, a sewing line 401 may be formed at the boundary portion between the adjacent filtration members 100 to connect the filtration members 100 to each other.

At this time, the connecting strip 400 may be provided on only the outer surface of each of the filtration members 100. Alternatively, the connecting strip 400 may be provided on both the outer surface and the inner surface of each of the filtration members 100 to increase the coupling force of the plurality of filtration members 100.

Specifically, as shown in Fig. 9, the connecting strip 400 may include an outer strip 410 and an inner strip 420.

The outer strip 410 is disposed outside the boundary portion of the adjacent filtration members 100 and may be sewn to the filtration members 100 to connect the filtration members 100 on the outer side thereof.

Furthermore, the inner strip 420 is disposed inside the boundary portion of the adjacent filtration members 100 and may be sewn to the filtration members 100 to connect the filtration members 100 on the inner side thereof.

Fig. 9 is a sectional view (taken along line D-D in Fig. 8) obtained by longitudinally cutting the adjacent filtration members 100 to show a coupling structure of the filtration members 100, the outer strip 410 and the inner strip 420. The structure in which the connecting strip 400 is sewn to the filtration members 100 is the same as the structure of the above-described first embodiment in which the band member 200 is sewn to the filtration member 100, except that the inner strip 420 is additionally provided.

As described above, if the filtration members 100 having a certain length are connected to each other by the connection strip 400, it is possible to manufacture the filter bag 20 having a length longer than the length of one filtration member 100.

While the present disclosure has been described above using the preferred embodiments, the scope of the present disclosure is not limited to the specific embodiments described above. A person having ordinary knowledge in the relevant technical field will be able to replace or modify the constituent elements. Such replacement or modification should be construed to fall within the scope of the present disclosure.

Claims

A filter bag for a dust collector, comprising:

a filtration member with pleats having pleat ridges and pleat valleys alternately arranged along a circumferential direction; and

a band member provided along the circumferential direction to surround an outer surface of the filtration member and sewn to the pleat ridges and the pleat valleys.
The filter bag of claim 1, further comprising:

a plurality of reinforcing members installed at the pleat valleys and extending along a longitudinal direction of the filtration member.
The filter bag of claim 2, wherein the pleat valleys have accommodation portions for accommodating the reinforcing members.
The filter bag of claim 2, wherein the reinforcing members are formed of circular columnar strings or band-shaped fabrics.
The filter bag of claim 1, wherein the band member is sewn to the pleat ridges and the pleat valleys in a state in which the pleats are folded in a direction.
The filter bag of claim 1, wherein the band member includes a plurality of band members spaced apart from each other along the longitudinal direction of the filtration member.
The filter bag of claim 6, wherein the band members are sewn to the filtration member so that the pleats sewn to adjacent band members are folded in opposite directions.
The filter bag of claim 2, wherein the reinforcing members are formed of reinforcing fabrics installed on the entire outer surfaces of the pleat valleys to surround the entire outer surfaces of the pleat valleys.
The filter bag of claim 2, wherein the reinforcing members are formed of reinforcing fabrics installed on a part of the outer surfaces of the pleat valleys to surround the part of the outer surfaces of the pleat valleys.
A filter bag for a dust collector, comprising:

a plurality of filtration members with pleats having pleat ridges and pleat valleys alternately arranged along a circumferential direction;

a band member provided along the circumferential direction to surround outer surfaces of the filtration members and sewn to the pleat ridges and the pleat valleys; and

a connecting strip sewn to a boundary portion of each of the filtration members to connect the filtration members to each other.
The filter bag of claim 10, further comprising:

a plurality of reinforcing members installed at the pleat valleys and extending along a longitudinal direction of the filtration members;
The filter bag of claim 10, wherein the connecting strip includes an outer strip and an inner strip sewn to an outer surface and an inner surface of each of the filtration members, respectively.
The filter bag of claim 11, wherein the pleat valleys have accommodation portions for accommodating the reinforcing members.
The filter bag of claim 10, wherein the band member is sewn to the pleat ridges and the pleat valleys in a state in which the pleats are folded in a direction.
The filter bag of claim 10, wherein the band member includes a plurality of band members spaced apart from each other along the longitudinal direction of the filtration members.
The filter bag of claim 15, wherein the band members are sewn to the filtration members so that the pleats sewn to adjacent band members are folded in opposite directions.