Filter retainer and dust collector using the same

Abstract

To provide a retainer for a filter, which suppresses damaging of filter cloth, and a dust arrester using the same.SOLUTION: A retainer for a filter, which supports filter cloth from inside, comprises: a plurality of vertical wires V; and a support member H3 that supports the vertical wires from inside. The support member is set in a shape and arrangement so as to suppress contact of the filter cloth with the support member when the filter cloth is sucked inside.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a retainer for a filter and a dust collector using the same, and more particularly to a retainer for a filter that supports a filter cloth from the inside and a dust collector using the same.

Background Art

[0002] Exhaust gas discharged from waste incineration facilities and the like contains dust and dirt. In order to remove dust and the like, a dust collector such as a bag filter is used (see Patent Document 1). Fig. 1 shows the basic configuration of the dust collector 1. The inside of the main body 2 in the shape of a sealed container is partitioned by a partition wall 3 into an upper purification gas chamber and a lower dust collection chamber. Filters 6 are arranged in a plurality of openings provided in the partition wall 3.

[0003] Exhaust gas G is introduced from a gas inlet pipe 5 provided in the main body 2 to the dust collection chamber side. The flow of the exhaust gas G is indicated by a dotted arrow in Fig. 1. The exhaust gas that enters the dust collection chamber passes through the filter 6, flows into the purification gas chamber, and is discharged outside the main body through a gas outlet pipe 7. In order to assist this exhaust gas flow, a suction fan 8 is provided to suck the air inside the main body 2 to the outside.

[0004] When the exhaust gas G passes through the filter 6, dust and the like in the exhaust gas are removed by the filter 6. Therefore, a backwashing device 10 is provided to remove dust and the like accumulated on the outer surface of the filter 6. The backwashing device 10 includes a compressed air supply source 11 such as a compressor and an injector pipe 12 extending above the filter 6. Air nozzles 14 for supplying compressed air to each filter 6 are provided in the injector pipe 12. In order to control the supply of compressed air, an on-off valve 13 is provided between the compressed air supply source 11 and the injector pipe 12. This on-off valve 13 is used not only for supplying compressed air but also for supplying compressed air in a pulsed manner (pulse air).

[0005] When removing dust and other particles from the filter 6, compressed air (arrow PA) is injected from the injector pipe 12 toward the opening of the filter 6. The impact force of the compressed air hitting the inner surface of the filter 6, and the release of compressed air from the inside to the outside of the filter, cause dust and other particles on the filter surface to be brushed off or blown away. The dust and other particles that fall from the filter 6 (arrow DU) are collected in the dust collection chamber at the bottom of the main unit 2 and then discharged to the outside of the main unit 2 by the rotary valve 4.

[0006] Figure 2 shows an enlarged view of a part of the filter indicated by the dotted line frame A in Figure 1. The filter 6 comprises a filter cloth F (dotted line portion) that separates dust and other particles from exhaust gas, and a retainer that supports the filter cloth F from the inside. The filter cloth F is bag-shaped with an opening at the top, and exhaust gas enters the inside of the filter cloth from the side or bottom, at which time dust and other particles adhere to the surface of the filter cloth.

[0007] Conventional retainers consist of multiple vertical wires V and multiple horizontal rings H that hold the vertical wires V. The vertical wires V and horizontal rings H are made of metal such as steel, and the two are joined together by welding.

[0008] Filter media include cloth (nonwoven fabric) filters, glass fiber filters usable in high-temperature environments, and metal fiber filters. In particular, cloth filters and glass fiber filters have the problem of parts of the filter breaking when used for a long time. Patent document 2 proposes that, in order to prevent the filter cloth from coming into contact with the horizontal rings and becoming damaged by wear, the vertical wires are connected by a spiral member instead of horizontal rings, and the retainer is rotated in the circumferential direction at regular intervals to change the contact point between the filter cloth and the spiral member.

[0009] However, as stated in Patent Document 2, since the filter cloth and the spiral member come into contact, filter damage is unavoidable, and there is a need to extend the lifespan of the filter cloth. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2008-296128 [Patent Document 2] Japanese Patent Publication No. 2004-9001 [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] The present invention was made to solve the above problems, and its objective is to provide a filter retainer that suppresses damage to the filter cloth and a dust collector using the same. [Means for solving the problem]

[0012] The filter retainer and dust collector using the same according to the present invention, which solve the above problems, have the following technical features. (1) A filter retainer for supporting a filter cloth from the inside, comprising a plurality of vertical wires and a support member that supports the vertical wires from the inside, characterized in that the shape and arrangement of the support member are set to suppress contact between the filter cloth and the support member when the filter cloth is sucked inward.

[0013] (2) The filter retainer described in (1) above is characterized in that the support member located between two adjacent vertical wires has no portion that protrudes outward from the virtual plane that is in contact with the inside of two adjacent vertical wires.

[0014] (3) The filter retainer described in (2) above is characterized in that a horizontal ring is provided at the upper or lower end of the retainer to support the vertical wire from the inside.

[0015] (4) The filter retainer described in (2) above is characterized in that the support member comprises a linear member which is a single straight or curved line or a polygonal straight or curved line which supports the vertical wire, and a plurality of such linear members are arranged spaced apart in the longitudinal direction of the retainer.

[0016] (5) In the retainer for a filter according to (2) above, the support member has an annular portion at the center, and supports the vertical wire member with a protruding portion extending radially from the annular portion.

[0017] (6) A dust collector using the retainer for a filter according to any one of (1) to (5) above.

Advantages of the Invention

[0018] The retainer for a filter and the dust collector using the same according to the present invention, particularly in the retainer for a filter that supports the filter cloth from the inside, includes a plurality of vertical wire members and a support member that supports the vertical wire members from the inside. When the filter cloth is sucked inward, the shape and arrangement of the support member are set so as to suppress the filter cloth from contacting the support member. Therefore, the contact between the filter cloth and the support member is reduced, the filter cloth is prevented from being damaged, and the service life of the filter cloth becomes longer.

[0019] Specifically, with respect to a virtual plane that contacts the inside of two adjacent vertical wire members, the support member located between the two adjacent vertical wire members is configured not to have a portion protruding outward from the virtual plane. Therefore, it is possible to more reliably suppress the contact between the filter cloth and the support member.

Brief Description of the Drawings

[0020] [Figure 1] It is a schematic diagram for explaining a conventional dust collector. [Figure 2] It is a diagram for explaining a part of the filter at the dotted line A in FIG. 1. [Figure 3] It is a diagram for explaining the problems of the structure of a conventional retainer for a filter. [Figure 4] It is a diagram for explaining the features of the structure of the retainer for a filter of the present invention. [Figure 5] It is a diagram for explaining a first embodiment of the retainer for a filter according to the present invention. [Figure 6] It is a diagram for explaining an application example of the first embodiment shown in FIG. 5. [Figure 7] FIG. 5 is a diagram for explaining an application example of the first embodiment shown in FIG. 5. [Figure 8] FIG. 4 is a diagram for explaining a second embodiment of the retainer for a filter according to the present invention. [Figure 9] FIG. 7 is a plan view of the filter retainer of FIG. 8 as viewed in the longitudinal direction (central axis direction). [Figure 10] FIG. 9 is a diagram for explaining an application example of the second embodiment shown in FIG. 9. [Figure 11] FIG. 13 is a diagram for explaining a third embodiment of the retainer for a filter according to the present invention. [Figure 12] FIG. 16 is a diagram for explaining an application example of the third embodiment shown in FIG. 11.

BEST MODE FOR CARRYING OUT THE INVENTION

[0021] The inventor has investigated in detail the cause of the filter cloth breakage and found that in the filter cloth, especially the glass fiber filter, "the material is weak against repeated bending and impact and breaks". As shown in FIG. 1, when compressed air for removing dust or the like is supplied to the filter of the dust collector, the filter expands outward, and then, by the blowers (reference numeral 8 etc.) arranged before and after the dust collector, the filter cloth is sucked inward and shrinks. When shrinking, it has been found that the main cause is that the filter cloth contacts the conventional horizontal ring and breaks.

[0022] Therefore, in the present invention, as shown in FIGS. 4 to 12, in the filter retainer that supports the filter cloth from the inside, it includes a plurality of vertical wire members V and support members (H1 to H80) that support the vertical wire members from the inside, and when the filter cloth is sucked inward, the shape and arrangement of the support members are set so as to suppress the filter cloth from contacting the support members. At this time, it is preferable that the filter cloth is supported only by the vertical wire members.

[0023] Figure 3 shows a conventional retainer using a horizontal ring (ring-shaped support member), viewed in the longitudinal direction (central axis direction) of the retainer. As shown in Figure 3, with respect to a virtual plane L1 that is in contact with the inside of two adjacent vertical wires (V1, V2), the support member (horizontal ring) H, which is located between the two adjacent vertical wires, has a portion B that protrudes outward from the virtual plane L1. This protruding portion is prone to coming into contact with the filter cloth when the filter cloth shrinks, which can cause damage.

[0024] Therefore, in the present invention, as shown in Figure 4, the support members (H1, H2) located between two adjacent vertical wires (V1, V2) are positioned such that they do not have any portion protruding outward from the virtual plane L1 (see dotted line frame C). Depending on how far the filter cloth protrudes inward when it is sucked inward, it is preferable to position the support members further inward from the virtual plane L1.

[0025] A first embodiment of the filter retainer of the present invention will be described with reference to Figure 5. As shown in Figure 5, the support members utilize straight steel materials, connecting the inner portions of each vertical wire V with support members H3. Support members H3 are not positioned between two adjacent vertical wires V, but they connect vertical wires that are far apart, such as every two or every three wires V. This ensures that the support members H3 are positioned inside the virtual plane L1, as shown in Figure 4. The angle θ between the extending direction of the support member H3 and the longitudinal direction of the retainer can be a right angle, or it can be an angle, such as θ = 45°.

[0026] Figure 6 shows the retainer from Figure 5 viewed in the longitudinal direction (the direction in which the vertical wires extend, along the central axis of the multiple vertical wires arranged in a ring shape as shown by the dotted lines TC and BC). As shown in Figure 6, all vertical wires V are connected to at least one support member H4 (H3). Naturally, it is preferable that each vertical wire is supported by multiple support members H4 (H3). In Figure 5, the support members were formed from a single straight steel member, but as shown in Figure 6, it is also possible to use a straight-bent steel member to support three or more vertical wires V with a single support member H4. Finally, the vertical wires V are arranged and fixed in a ring shape as shown by the dotted line C1 in Figure 6.

[0027] Furthermore, as shown in Figure 7, it is also possible to use a support member H6 in which a bent portion is provided in part of a straight steel material. It is important that the support member is configured to fix the vertical wire V in the intended position and to prevent the position of the vertical wire V from moving inward due to, for example, the shrinkage of the filter cloth. For this reason, in parts where the support force of the support member is weak, it is possible to strengthen the support force against external stress by using a bent support member H6 as shown in Figure 7.

[0028] Furthermore, the arrangement of the support members H3 (H4~H6) connecting each vertical wire V is not limited to being perpendicular to the extension direction (longitudinal direction) of the vertical wire. It is also possible to arrange them at an angle other than a right angle to the extension direction.

[0029] Furthermore, while the support members can be arranged so that they intersect each other, dust and other debris tend to accumulate at the intersections. Therefore, it is also possible to configure them to be spaced apart from each other by creating a "twisted position" as shown in Figure 5.

[0030] At the upper or lower end of the retainer, in order to adjust the arrangement of the vertical wires to be in a ring shape, the support members that support the vertical wires from the inside can be made of horizontal rings, as shown by the dotted lines TC and BC in Figure 5. Of course, even in the middle of the vertical wires, horizontal rings may be used to the minimum extent necessary to maintain the ring shape of the vertical wires.

[0031] Figures 8 to 10 illustrate a second embodiment of the filter retainer of the present invention. As shown in Figure 8, with respect to the vertical wire V indicated by the dotted line, polygonal linear members are placed inside the area where the vertical wire is positioned, serving as support members (H10, H20).

[0032] As in the first embodiment, if a single straight (or curved) support member, or a single support member bent into shape, is used, the process of welding the support member to the vertical wire becomes extremely complicated. Therefore, by using a polygonal linear member as the support member in advance, the joining of the support member and the vertical wire can be completed simply by welding the vertical wire to the vertices of the polygon, thereby dramatically improving work efficiency. The shape of the polygon is not limited to the quadrilaterals shown in Figures 8 and 9; various shapes such as triangles and pentagons can be used. Naturally, the side lengths of each polygon do not always need to be the same, and various applications such as isosceles triangles and rectangles are possible.

[0033] Furthermore, as shown in Figure 10, it is also possible to construct the sides forming the polygon with curves. This makes it possible to exert a stronger support force when inward stress is applied to the vertical wires.

[0034] As shown in Figure 8, support members H10 and H20 can be positioned not only perpendicular to the extension direction of the vertical wire, but also at an angle to the extension direction. Furthermore, adjacent support members (H10, H20) can be positioned spaced apart to prevent direct contact between them and the formation of intersections in the linear members.

[0035] Furthermore, in order to arrange the vertical wires in a ring shape at the upper or lower end of the retainer, it is also possible to arrange support members H1 and H2 overlapping or in close proximity, as shown in Figure 8, instead of the horizontal ring (dotted line TC, etc.) in Figure 5. Alternatively, it is possible to pre-form the shape of the support member so that its shape in plan view is the shape of support members H1 and H2 overlapping, and then place it at the upper or lower end of the retainer.

[0036] A third embodiment of the filter retainer of the present invention is shown in Figures 11 and 12. In Figure 11, the support member has an annular portion H8 in the center, and supports the vertical wire V with protrusions H80 extending radially from the annular portion H8. By ensuring a sufficient distance between the vertical member V and the annular portion H8, it is possible to effectively prevent the filter cloth from coming into contact with the support member.

[0037] As an application example of Figure 11, it is also possible to construct the annular portion and the protruding portion from a single component, as shown in Figure 12. In this case, the portion corresponding to the annular portion is constructed as a wave, and the portion that protrudes outside the wave is the protruding portion. Of course, another component may be attached to the outside of the protruding portion of the wave, as shown in H80 in Figure 11.

[0038] In addition to the configuration of the present invention described above, it is also possible to increase the number of vertical wires themselves to narrow the gaps between adjacent vertical wires and prevent the filter cloth from getting caught. However, it should be noted that in this case, since the flow path of the exhaust gas will also be narrowed as the gaps become narrower, it will be necessary to increase the suction force. [Industrial applicability]

[0039] As described above, the present invention makes it possible to provide a filter retainer that suppresses damage to the filter cloth and a dust collector using the same. [Explanation of Symbols]

[0040] V-shaped vertical wire H horizontal ring H1~H80 Support Members

Claims

1. The main body and A filter cloth made of glass fiber is placed inside the main body, A filter retainer that supports the filter cloth from the inside, A suction fan that draws the filter cloth inward In a dust collector equipped with, The filter retainer comprises a plurality of vertical wires and a support member that supports the vertical wires from the inside. Of the aforementioned support members, all support members except for the upper or lower end of the retainer are positioned such that, with respect to a virtual plane that is in contact with the inside of two adjacent vertical wires, the support member located between the two adjacent vertical wires is positioned inward from the virtual plane, and Of the aforementioned support members, all support members except for the upper or lower end of the retainer are positioned so that their shape and arrangement are closer to the central axis of the retainer than the range in which the filter cloth protrudes inward when the differential pressure between the inside and outside of the filter cloth reaches a preset maximum value in the dust collector due to clogging of the filter cloth. A dust collector characterized by the following features.

2. In the dust collector according to claim 1, The support member is positioned such that it is not located on the central axis of the retainer. A dust collector characterized by the following features.

3. In the dust collector according to either claim 1 or 2, A dust collector characterized in that a horizontal ring is arranged at the upper or lower end of the retainer to support the vertical wire from the inside.

4. In the dust collector according to either claim 1 or 2, The dust collector is characterized in that the support member comprises a linear member composed of a single straight or curved line, or a polygonal straight or curved line, which supports the vertical wire, and a plurality of such linear members are arranged spaced apart in the longitudinal direction of the retainer.

5. In the dust collector according to either claim 1 or 2, The dust collector is characterized in that the support member has an annular portion in the center and supports the vertical wire material with protrusions extending radially from the annular portion.

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