JP2016198739A - Filter-cloth structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter-cloth structure capable of achieving energy saving by reduction of an average pressure loss of the filter cloth or improvement of a lifetime of the filter cloth, by improving brushing-off efficiency of dust during regeneration of the filter cloth.SOLUTION: In a filter-cloth structure used by mounting a filter cloth F on a retainer C, the length of the filter cloth F is formed shorter than the length of a filter-cloth mounting part of the retainer C, and the filter cloth F is mounted on the filter-cloth mounting part of the retainer C in the state where the filter cloth F is elongated.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a filter cloth structure used for a dust collector or the like.

  Conventionally, as a filter cloth used in a dust collector or the like, a filter cloth source formed by laminating a base cloth layer made of a woven cloth and a filter layer made of a non-woven cloth bonded to at least the filtration surface side of the base cloth layer. The filter is formed into a cylindrical shape, filtered by passing dust-containing air from the filtration surface side of the filter cloth to the filtration back surface side, and a countercurrent airflow is passed from the filtration back surface side of the filter cloth to the filtration surface side. In general, a device that removes collected dust is widely used (see, for example, Patent Document 1).

  By the way, this filter cloth uses the filter cloth original fabric comprised by laminating | stacking the base fabric layer which consists of a woven fabric, and the filter layer which consists of a nonwoven fabric as it is, and joins the side edges extended in the longitudinal direction. Therefore, the woven fabric of the base fabric layer is formed by weaving warps and wefts, but the direction of the warp is relative to the tube axis direction of the filter fabric formed in a cylinder. It was common that the directions of the wefts were parallel to each other and perpendicular to the cylinder axis direction.

  Then, the dust collector equipped with this filter cloth is operated, and dust is trapped on the filter cloth by passing dust-containing air from the filter surface side to the filter back side of the filter cloth. When dust collected on the filtration surface side adheres, the filter cloth is clogged in the filter layer, and the pressure loss increases.

  In this case, it is necessary to remove dust adhering to the filter layer of the filter cloth and return the pressure loss to a low state. Therefore, a dust collector having a function of regenerating the filter cloth by passing a backflow air flow from the filter back surface side to the filter surface side of the filter cloth is used (for example, refer to Patent Document 2).

  However, in the conventional filter cloth, the warp direction is parallel to the cylinder axis direction of the filter cloth formed in a cylindrical shape, and the weft direction is perpendicular to the cylinder axis direction. Even if the filter is vibrated or stretched, the displacement of the filter layer in the surface direction (cylinder circumferential direction) is limited by the weft, so that the filter layer is actively expanded and contracted in the surface direction (cylinder circumferential direction). Didn't work. That is, it was not the structure which can be positively displaced to the filtration surface side (cylinder radial direction side) of a filter cloth.

  In addition, when such a filter cloth is used in a dust collector, dust collected on the filter surface of the filter cloth can be removed by the passage of the backflow airflow, but the filter layer is positive in the surface direction as described above. Therefore, it is difficult to efficiently remove dust that has entered the filter cloth.

  In the dust collector as described above, the efficiency of removing dust that has entered the filter cloth cannot be improved, so that the average pressure loss due to the filter cloth gradually increases and the pressure of the backflow airflow increases. Due to the necessity of increasing the number of payouts, it has become impossible to realize energy saving and improvement of filter cloth life.

  On the other hand, in order to solve the above-mentioned problems, the applicant of the present application previously formed, for example, a tubular fabric by spirally winding a woven fabric in which a base fabric layer 20 is woven in a strip shape as shown in FIG. The warp and weft yarns that form the woven fabric of the base fabric layer 20 are formed by stitching, and one and the other of the warp yarns and the weft yarns are in the cylindrical axis direction X and the cylindrical circumferential direction Y of the filter cloth F that is formed in a cylindrical shape. The filter cloth F which consists of the filter cloth F formed in the cylinder shape arrange | positioned incline is proposed (refer patent document 3).

JP-A-5-269320 JP 2008-279405 A JP 2009-253294 A

In the filter cloth F described in Patent Document 3, the displacement of the filter layer in the surface direction (cylinder circumferential direction) is not limited by either one or the other of the warp and the weft, and as a result, the filter cloth F is filtered. The displacement to the surface side (cylinder radial direction side) is not limited (that is, a certain amount of displacement is allowed). In this case, with the displacement of the filter cloth F toward the filtration surface, the crossing angle between the warp and the weft in the base cloth layer of the filter cloth F can be changed relatively greatly.
Due to the change in the crossing angle between the warp and the weft, the expansion and contraction in the surface direction of the filter layer made of the nonwoven fabric bonded to at least the filtration surface side of the base fabric layer occurs greatly.
And since the filter layer is comprised with the nonwoven fabric formed in which a fine fiber is entangled, the expansion-contraction of the surface direction of a filter layer will change the shape of the clearance gap between these fine fibers over the whole surface.
Therefore, the dust collected in the filter layer made of nonwoven fabric is appropriately dispersed and crushed while aggregation is suppressed, and can be easily detached from the filter layer.
Therefore, there is an advantage that the filter cloth F can be obtained which can improve the dust removal efficiency and can save energy by reducing the average pressure loss of the filter cloth F and improve the life of the filter cloth.

However, the filter cloth F described in Patent Document 3 is configured by forming the base fabric layer 20 into a tubular shape by spirally winding a woven fabric woven in a strip shape, and stitching it. In the filter cloth structure that is used by attaching the filter cloth F to the retainer, there is no one that firmly restricts the length of the filter cloth F in the cylinder axis direction X. F extends in the cylinder axis direction X due to its own weight or the like and hangs down from the lower end of the retainer.
Then, in the sagging portion, unless special measures are taken, the tension of the filter cloth F is lost, and the efficiency of removing the collected dust is lowered. Accordingly, the filtering function of the filter cloth F is lowered. At the same time, stress concentrates on the sagging portion and damage is likely to occur, which may hinder the energy saving of the filter cloth F and the improvement of the life of the filter cloth F.

  In view of the problems of the conventional filter cloth, the present invention improves the efficiency of dust removal when the filter cloth is regenerated, reduces energy consumption by reducing the average pressure loss of the filter cloth, and reduces the life of the filter cloth. It aims at providing the filter cloth structure which enabled it to implement | achieve improvement.

  In order to achieve the above object, the filter cloth structure of the present invention is a filter cloth structure in which the filter cloth is mounted on a retainer, and the length of the filter cloth is set to the length of the filter cloth mounting portion of the retainer. The filter cloth is formed to be shorter than the length of the filter cloth, and the filter cloth is attached to the filter cloth attachment portion of the retainer in a stretched state.

  In this case, the length of the filter cloth can be formed to 90 to 99% of the length of the filter cloth mounting portion of the retainer.

  Moreover, the diameter of a filter cloth can be formed in 100 to 120% of the diameter of the filter cloth mounting part of a retainer.

  Further, the filter cloth is configured by laminating a base fabric layer made of woven fabric and a filter layer made of non-woven fabric, and the warp of the woven fabric constituting the base fabric layer is arranged in the cylinder axis direction of the filter fabric. It can be formed so as to cross diagonally.

  Moreover, the said filter cloth can form the strip-shaped cloth piece which cut | judged the filter cloth original fabric diagonally, and joined the side edges extended in the longitudinal direction, and was formed in the cylinder shape.

  The filter cloth is formed by laminating a base fabric layer made of a woven fabric and a filter layer made of a non-woven fabric, and the warp of the woven fabric constituting the base fabric layer coincides with the axial direction of the filter cloth. It can have elasticity.

  Moreover, the said filter cloth can be formed in a bottomed cylinder shape.

According to the filter cloth structure of the present invention, the length of the filter cloth is formed to be shorter than the length of the filter cloth attachment portion of the retainer, and the filter cloth is attached to the filter cloth attachment portion of the retainer in an extended state. By doing so, tension in the cylinder axis direction by the filter cloth itself is applied to the filter cloth mounted on the filter cloth mounting portion of the retainer. By extending in the direction, it is possible to prevent the retainer from drooping from the lower end of the retainer.
Thus, without providing a tension applying means such as a weight body, a gap is not generated between the filter cloth and the retainer, and tension can be applied to the filter cloth in the cylinder axis direction. Combined with the fact that it is possible to improve the efficiency of dust removal during the regeneration of the filter, reduce the average pressure loss of the filter cloth, save energy, and prevent the filter cloth from being damaged due to stress concentration. An improvement in the life of the fabric can be realized.
Moreover, the usage amount of the filter cloth original fabric can be reduced by forming the length of the filter cloth shorter than the length of the filter cloth mounting portion of the retainer.

  In this case, the length of the filter cloth is formed to be 90 to 99% of the length of the filter cloth attaching portion of the retainer, so that the filter cloth attached to the filter cloth attaching portion of the retainer is attached to the tube by the filter cloth itself. Appropriate tension in the axial direction can be applied.

  In addition, by forming the filter cloth with a diameter of 100 to 120% of the diameter of the retainer's filter cloth mounting portion, the contact of the filter cloth with the retainer when the filter cloth is stretched and mounted on the filter cloth mount portion of the retainer. Resistance can be suppressed, and the work of attaching the filter cloth to the retainer can be easily performed.

  Further, the filter cloth is configured by laminating a base fabric layer made of woven fabric and a filter layer made of non-woven fabric, and the warp of the woven fabric constituting the base fabric layer is arranged in the cylinder axis direction of the filter fabric. On the other hand, when the filter cloth is formed so as to cross at an angle, dust removal efficiency at the time of regeneration of the filter cloth can be improved.

  Further, the filter cloth is a strip-shaped piece of cloth obtained by obliquely cutting the filter cloth, and the filter cloth is formed into a cylindrical shape by joining side edges extending in the longitudinal direction. It can be easily manufactured without requiring a special sewing device or technique.

  The filter cloth is formed by laminating a base fabric layer made of a woven fabric and a filter layer made of a non-woven fabric, and the warp of the woven fabric constituting the base fabric layer coincides with the axial direction of the filter cloth. By having elasticity, the filter cloth can be easily manufactured without requiring a special sewing device or technique.

  Further, by forming the filter cloth in a bottomed cylindrical shape, the filter cloth can be easily mounted on the filter cloth mounting portion of the retainer.

1 is an overall configuration diagram of a dust collector to which a filter cloth structure according to the present invention is applied. It is a longitudinal section showing a filter cloth structure formed by attaching a filter cloth to a retainer. (A) And (b) is a top view showing the base fabric layer of a filter cloth, (c) is sectional drawing showing the structure of a filter cloth. It is explanatory drawing showing the method of attaching a filter cloth to a retainer. It is explanatory drawing showing the state change of the filter cloth with which a retainer is mounted | worn. It is explanatory drawing showing the state change of the filter cloth with which a retainer is mounted | worn. It is explanatory drawing showing the state change of the filter cloth with which a retainer is mounted | worn. It is explanatory drawing showing the method for forming a filter cloth in a cylinder shape. It is explanatory drawing showing the method for forming a filter cloth in a cylinder shape. It is explanatory drawing showing the method for forming a filter cloth in a cylinder shape. It is explanatory drawing which shows the manufacturing process of a filter cloth. It is explanatory drawing which shows the manufacturing process from which a filter cloth differs. It is explanatory drawing which shows the example from which a filter cloth differs.

  Hereinafter, embodiments of the filter cloth structure of the present invention will be described with reference to the drawings.

1 to 2 show a dust collector to which the filter cloth structure of the present invention is applied.
This dust collector is formed by partitioning the inside of a housing 2 into a dust-containing air introduction chamber 4 (also referred to as a dirty side) and a purified air chamber 5 (also referred to as a clean side) by a partition wall 3.

The dust-containing air introduction chamber 4 includes a tapered falling dust receiving portion 4b at the lower portion, and a falling dust discharge port 4c is provided at the tapered bottom portion.
Further, a dust-containing air introduction port 4 a for introducing the dust-containing air A into the dust-containing air introduction chamber 4 is provided at the side of the dust-containing air introduction chamber 4.

A purified air suction pipe 6 having a suction device 7 is connected to the purified air chamber 5.
In addition, a high-pressure air introduction pipe 8 is provided in which one end side is closed and a compressed air tank as high-pressure air supply means B is connected to the other end side while penetrating the side wall of the purified air chamber 5.

Note that a compressor for supplying high-pressure air is connected to the compressed air tank.
Further, a valve 11 for switching supply and stop of high-pressure air into the high-pressure air introduction pipe 8 is provided on the high-pressure air supply means B side of the high-pressure air introduction pipe 8.

The high-pressure air introduction pipe 8 includes a high-pressure air ejection nozzle 9 at a position corresponding to the upper part of each of the plurality of openings 3a.
The valve 11 can be switched between a state in which high-pressure air as a backflow airflow H is sent and a state in which it is not sent to each of the high-pressure air ejection nozzles 9 by opening and closing the valve 11.

  A control device (not shown) is connected to the valve 11, and the difference between the gas pressure in the dust-containing air introduction chamber 4 and the gas pressure in the purified air chamber 5 is equal to or greater than a set value by a pressure detection unit (not shown). In other words, that is, when dust adheres to the filter cloth F and the average pressure loss increases, the valve 11 is temporarily opened, and high pressure air is ejected in pulses to each of the high pressure air ejection nozzles 9. Is configured to do.

  Next, the structure of each filter cloth F and the structure of attaching the filter cloth F to the opening 3a will be described.

[Composition of filter cloth]
As shown in FIG. 3C, the filter cloth F includes a base fabric layer 20 made of woven fabric, a filter layer 21a made of a nonwoven fabric bonded to the filtration surface side of the base fabric layer 20, and the base fabric layer. 20 is formed by laminating a filter layer 21b made of a nonwoven fabric bonded to the back side of the filtration, and the filter cloth F is formed in a bottomed cylindrical shape having an open top.
The filter cloth F may be composed of a woven cloth that does not have one or both of the filter layers 21a and 21b. The bottom of the filter cloth F is matched to the shape of the retainer C to which the filter cloth F is attached. It may be formed and formed in a cylindrical shape that does not have, and these are not excluded.
The fiber material constituting the base fabric layer 20 and the filter layers 21a and 21b of the filter cloth F includes polyester fibers, polyamide fibers, polyimide fibers, and aramid fibers that are conventionally used depending on the use of the filter cloth F. In addition to synthetic fibers such as polypropylene fibers, inorganic fibers such as glass fibers can be used, and the weaving method is twill weave, satin weave, felt, satin weave, double weave according to the use of filter cloth F. Etc. can be applied.

Specifically, for example, as shown in FIG. 3 (a), the base fabric layer 20 is a woven woven in a band shape in which the warp yarn 20a and the weft yarn 20b are orthogonal to each other and are not clogged. It is composed of cloth.
Then, a felt type filter cloth F in which the base fabric layer 20 and the filter layers 21a and 21b are entangled by needle punching is configured.

  In addition, about the coupling | bonding of the base fabric layer 20 and the filter layers 21a and 21b, various coupling | bonding methods, such as the coupling | bonding by heat fusion other than an entanglement coupling | bonding, are employable. Moreover, it can also comprise so that only the filter layer 21a of the filtration surface side of the base fabric layer 20 may be provided among the filter layers 21a and 21b. Hereinafter, the filter layers 21a and 21b may be collectively referred to as the filter layer 21, but when described in this way, the configuration including only the filter layer 21a or the configuration including both the filter layers 21a and 21b. One or both of them.

In manufacturing the cylindrical filter cloth F, the base fabric layer 20 to which the filter layer 21 is bonded is woven so that the warp yarn 20a and the weft yarn 20b are orthogonal to each other as shown in FIGS. 8 (a) and 8 (b). The formed belt-like woven fabric is cut into a rectangular shape that is inclined with respect to each side of the woven fabric, and the opposite sides n and m are stitched together to form a cylinder.
By configuring in this way, one and the other of the warp yarn 20a and the weft yarn 20b constituting the woven fabric of the base fabric layer 20 are inclined with respect to the cylinder circumferential direction Y of the filter cloth F formed in a cylindrical shape. It will be arranged.

  In addition, as shown in FIGS. 9A and 9B, the base fabric layer 20 is formed in a cylindrical shape by spirally winding a belt-shaped woven fabric in which the warp yarn 20a and the weft yarn 20b are orthogonally crossed. Then, the sides m and n can be sewn.

  Even in this case, using a woven fabric woven so that the warp yarn 20a and the weft yarn 20b are not orthogonal to each other, one and the other of the warp yarn and the weft yarn are in the cylinder circumferential direction of the filter cloth formed in the cylindrical shape It is also possible to form a spiral so as to be inclined with respect to Y.

Here, an inclination angle at which one of the warp yarn 20a and the weft yarn 20b in the base fabric layer 20 of the filter cloth F formed in a cylinder shape is inclined with respect to the cylinder circumferential direction Y of the filter cloth formed in a cylinder shape (FIG. 3). The angle α) in (b) is configured to be within a range of 15 degrees to 75 degrees (preferably 30 degrees to 60 degrees, more preferably 40 degrees to 50 degrees, the same applies hereinafter). .
That is, when the inclination angle α (configured at 45 degrees in FIG. 3B) is within the range of 15 degrees to 75 degrees, the filter cloth F formed in a cylindrical shape has its filtration surface side. The displacement of the warp yarn 20a and the weft yarn 20b is less limited with respect to the displacement in the (cylinder radial direction side), and the displacement changes the crossing angle between the warp yarn 20a and the weft yarn 20b of the base fabric layer 20. It will contribute to the exact.
The change in the crossing angle between the warp yarns 20a and the weft yarns 20b of the base fabric layer 20 causes expansion and contraction in the surface direction (cylindrical circumferential direction Y) of the filter layer 21 made of nonwoven fabric as described above, and is collected in the filter layer 21. The dust that has been dispersed is appropriately dispersed and crushed while the aggregation is suppressed, and can be easily detached from the filter layer 21 made of nonwoven fabric.

Furthermore, the inclination angle (angle β in FIG. 3B) at which the other of the warp yarn 20a and the weft yarn 20b is inclined with respect to the cylindrical axis direction of the filter cloth F formed in a cylindrical shape is 15 ° to 75 °. It is configured to be within the range.
That is, if the inclination angle at which the other of the warp yarn 20a and the weft yarn 20b is inclined with respect to the cylinder axis direction of the filter cloth F formed in a cylinder shape is 45 degrees as shown in FIG. The formed filter cloth F is most likely to expand and contract in the cylinder axis direction. However, in the range deviating from this angle, the other of the warp yarn 20a and the weft yarn 20b is formed into a cylindrical shape. If the inclination angle inclined with respect to the axial direction is within a range of 15 degrees to 75 degrees, the displacement of the filter cloth F formed in a cylindrical shape toward the filtration surface side or the tube axis of the filter cloth formed in a cylindrical shape The expansion and contraction in the direction can be caused more reliably.
Therefore, the expansion and contraction in the cylinder axis direction accurately contributes to the change in the crossing angle between the warp 20a and the weft 20b of the base fabric layer 20, and the change in the crossing angle between the warp 20a and the weft 20b of the base fabric layer 20 is As described above, expansion and contraction in the surface direction (cylinder circumferential direction Y) of the filter layer 21 made of a nonwoven fabric is generated, so that dust collected in the filter layer 21 is appropriately dispersed and crushed while aggregation is suppressed. The filter layer 21 can be easily detached.
Here, the intersecting angle between the warp yarn 20a and the weft yarn 20b of the base fabric layer 20 is configured to be in the range of 30 degrees to 150 degrees.

[Filter cloth and its mounting structure]
Next, an attachment configuration for attaching the filter cloth F to the dust collector 1 will be described.
As shown in FIG. 2, the filter cloth F is configured to be attached to the opening 3 a while being attached to the retainer C.
The retainer C is welded to a straight bar-like support bar 51 and a circular support ring 52 provided in a state of being spaced apart in the longitudinal direction of the support bar 51 to form a cylindrical bowl-like shape through which air can flow. It is formed.

  A flange portion 3f having a diameter larger than the diameter of the opening 3a provided in the partition wall 3 is provided at one end of the retainer C, and the flange 3f is provided at the peripheral portion of the opening 3a. Placed and supported. In addition, a press-contact holding portion 3b provided with a convex portion protruding toward the inner diameter side is suspended in a cylindrical shape on the dust-containing air introduction chamber 4 side at the peripheral edge portion of the opening 3a in the partition wall 3.

  In the attached state of the filter cloth F, a snap ring 3s fitted so as to be urged in the diameter increasing direction is provided immediately below the flange portion 3f of the retainer C, and the snap ring 3s is expanded in diameter to be filtered. The cloth F is pressed from the inside while being sandwiched between the snap ring 3s and the convex portion of the press-contact holding portion 3b. Thus, the filter cloth F and the retainer C are in a state of being integrally fixed to the opening 3a.

When attaching the filter cloth F to the retainer C, the bottom of the filter cloth F formed in a bottomed cylindrical shape is shaped as a disk having a disk shape having the same diameter as the support ring 52 as necessary. A bottom plate 53 is provided.
The shape-retaining bottom plate 53 is a member independent of the retainer C, and is placed and supported by the bottom portion of the filter cloth F configured in a bottomed cylindrical shape, and is disposed integrally with the retainer C. You can also

In this embodiment, the filter cloth F is formed so that the length of the filter cloth F is shorter than the length of the filter cloth mounting portion of the retainer C and the filter cloth F is extended as shown in FIG. It attaches to the filter cloth attachment part of C.
Thereby, since the tension | tensile_strength of the cylinder axial direction X by the filter cloth F itself will be provided to the filter cloth F with which the filter cloth mounting part of the retainer C was attached, the filter cloth F will be the By extending in the cylinder axis direction X, it is possible to prevent the retainer C from hanging down.
Thereby, even if tension applying means such as a weight is not provided, a gap is not generated between the filter cloth F and the retainer C, and tension can be applied to the filter cloth F in the cylinder axis direction X. It is possible to improve the efficiency of dust removal during the regeneration of the filter cloth F, to realize energy saving by reducing the average pressure loss of the filter cloth F, and to prevent the filter cloth F from being damaged due to stress concentration. In combination with this, the life of the filter cloth F can be improved.
Further, by forming the length of the filter cloth F to be shorter than the length of the filter cloth mounting portion of the retainer C, the amount of the filter cloth original fabric used can be reduced.
In the present embodiment, the retainer C is configured with a structure in which the length of the filter cloth mounting portion is not changed, but the length of the filter cloth mounting portion is configured to be variable, specifically, the retainer. The straight bar-shaped support bar 51 of C is configured to be extendable, and the filter cloth F is attached to the filter cloth attachment portion of the retainer C, and then the filter cloth attachment portion of the retainer C is extended to extend the filter cloth attachment of the retainer C. The length of the part may be longer than the length of the filter cloth F, and the filter cloth F may be attached to the filter cloth attachment part of the retainer C in a stretched state.

In this case, the length of the filter cloth F is formed to be 90 to 99%, preferably 95 to 99% of the length of the filter cloth mounting portion of the retainer C.
Thereby, the moderate tension | tensile_strength of the cylinder axial direction X by the filter cloth F itself can be provided to the filter cloth F with which the filter cloth mounting part of the retainer C was mounted | worn.

The diameter of the filter cloth F is formed to be 100 to 120%, preferably 100 to 115% of the diameter of the filter cloth mounting portion of the retainer C.
Thereby, the contact resistance with respect to the retainer C of the filter cloth F at the time of extending | stretching the filter cloth F and mounting to the filter cloth mounting part of the retainer C can be suppressed, and the mounting work with respect to the retainer C of the filter cloth F can be performed easily. it can.

[Modified configuration of filter cloth]
And the filter cloth F which comprises this filter cloth is the filter cloth comprised by laminating | stacking the base fabric layer which consists of a woven fabric, and the filter layer which consists of a nonwoven fabric, as shown to Fig.11 (a) and (b). A strip-shaped cloth piece (hereinafter referred to as “bias piece”) F2 obtained by obliquely cutting the cloth original fabric F2A is joined to the side edges extending in the longitudinal direction as shown in FIG. 31) and formed into a cylindrical shape.

In this case, the bias piece F2 is obtained by obliquely cutting the filter cloth original fabric F2A so as to form angles α1 and α2 with respect to the warp yarn 20a and the weft yarn 20b of the filter fabric original fabric F2A, respectively.
Here, the angles α1 and α2 are set to 15 to 75 degrees, preferably 30 to 60 degrees, and more preferably about 40 to 50 degrees.

Since the length dimension in the longitudinal direction of the bias piece F2 is restricted by the dimension in the width direction of the filter cloth original fabric F2A, the long filter cloth F is often not supported as it is. As shown in FIG. 11 (c), the plurality of bias pieces F2 are joined in the longitudinal direction (joining location 32) and cut at a position corresponding to the length of the filter cloth F (cutting location 35).
Thereby, the filter cloth F of various lengths including the long filter cloth F can be manufactured easily.

By the way, the joining in the longitudinal direction is performed after cutting to the bias piece F2, and first, as shown in FIG. 12A, a plurality of filter cloth original fabrics F2A are joined in the width direction (joining points 33). Then, after setting the dimension in the width direction to a length corresponding to the length of the filter cloth F, as shown in FIG. The bias piece F2 is joined in the longitudinal direction (joint location 33), and then the side edges extending in the longitudinal direction are joined (joint location 31) as shown in FIG. It can also be formed.
Thereby, the operation | work which joins several bias piece F2 to a longitudinal direction can be made efficient.

  Furthermore, as shown in FIG. 12A, a plurality of filter cloth original fabrics F2A are joined together in the width direction (joining portion 33), and then the filter cloth original fabrics F2A are collectively cut obliquely to obtain a plurality of The end piece F2A ′ that was cut out when the bias piece F2 of the two pieces was joined in the longitudinal direction (joint location 33) was cut off on the opposite side of the length direction of the plurality of filter cloth original fabrics F2A joined in the width direction. By joining to the edge (joining location 34), the end material F2A ′ can be used, and the yield can be improved.

  As a joining method of the joining locations 31, 32, 33, 34, depending on the material of the base fabric layer made of the woven fabric constituting the filter cloth raw fabric F2A, for example, polyester fiber, glass fiber, etc., stitching, welding, etc. Any joining method can be selectively used.

  Here, since the joining method by welding does not require a special sewing device or technique, as shown in FIG. 13, a woven fabric F20 in which a base fabric layer is woven in a strip shape is spirally wound to form a tubular shape. By forming and joining (joining point 36), one and the other of the warp and the weft constituting the woven fabric F20 of the base fabric layer are formed in the tubular axial direction X and the tubular of the filter cloth F formed into a tubular shape. The filter cloth F formed in the cylinder shape inclined with respect to the circumferential direction Y can be obtained comparatively easily.

In addition, the filter cloth is formed by laminating a base fabric layer made of a woven fabric and a filter layer made of a non-woven fabric, and the warp of the woven fabric constituting the base fabric layer coincides with the axial direction of the filter fabric. It can also be made of a material having elasticity.
More specifically, for example, as shown in FIGS. 10 (a) and 10 (b), warp yarns 20a made of stretchable material are arranged in the tube axial direction X of the filter cloth F formed in a tubular shape. The weft thread 20b is disposed in an inclined manner in the cylinder circumferential direction Y of the filter cloth F formed in a cylindrical shape. That is, the other one of the warp and the weft thread is a cylinder shaft of the filter cloth formed in a cylindrical shape. It can be configured to be arranged in a direction.
Thereby, the filter cloth can be easily manufactured without requiring a special sewing device or technique.

[Dust collector operation]
Next, based on FIGS. 5-7, the operation | movement of the dust collector 1 provided with the filter cloth F comprised as mentioned above is demonstrated.
FIG. 5A shows a state of the filter cloth F in a state where the operation of the dust collector 1 is stopped (referred to as an operation stop state). FIG. 5B is a schematic diagram illustrating a state of the warp yarn 20a and the weft yarn 20b of the base fabric layer 20 in the operation stop state. In this figure, the warp yarn 20a and the weft yarn 20b are substantially orthogonal to each other, but actually, the warp yarn 20a and the weft yarn 20b are slightly stretched in the cylindrical axis direction of the filter cloth F formed in the cylindrical shape by the weight of the filter cloth F, etc. The angle β formed by the tube axis direction X of the filter cloth F formed in a cylindrical shape is in a slightly small state.

FIG. 6A shows a state in which the dust collector 1 is operated for filtration (referred to as a filtration operation state). In the filtration operation state, dust-containing air A is passed from the filtration surface side of the filter cloth F toward the filtration back surface side, and dust is collected on the filtration surface of the filter cloth F.
At this time, as shown in FIG. 6A, the filter cloth F is displaced to the back side of the filtration (inward side of the retainer C).
And as shown in FIG.6 (b), the angle (beta) which the distance between the warps 20a becomes small, and the cylinder axis direction X of the filter cloth F formed in the said warp 20a said cylinder shape is a little small. It is in a state to become.

FIG. 7A shows a state where dust adhering to the filtration surface of the filter cloth F is being wiped off (referred to as a “wiping off state”) in the operation state of the dust collector 1.
Dust collected by temporarily ejecting high-pressure air as the backflow airflow H while filtering by passing the dust-containing air A from the filtration surface side to the filtration back side of the filter cloth F in the wiped-off state. (So-called pulse jet method).
That is, a high-pressure air flow as a backflow air flow H from the inner side of the filter cloth F toward the outer side of the filter cloth causes the filter cloth F formed in the cylindrical shape of the filter cloth F to have a filter surface side (that is, a larger diameter). As shown in FIG. 7B, the angle β formed by the warp yarn 20a and the tube axis direction X of the filter cloth F formed in a cylindrical shape increases.

  Further, since the high-pressure air is repeatedly ejected at regular time intervals, for example, the filter cloth of the filter cloth F repeats the state of being displaced toward the filtration surface and the original state, whereby the angles α and β are also intermittently generated. In addition, since the expansion and contraction in the surface direction of the filter layer 21 occurs intermittently, the dust collected in the filter layer 21 is appropriately dispersed and crushed while the aggregation is suppressed. .

In the above configuration, the displacement of the filter cloth F toward the filtration surface is converted into a force in the contraction direction of the filter cloth F in the cylindrical tube axial direction X.
Accordingly, by balancing the tension in the tube axial direction X of the filter cloth F with the force in the contraction direction due to the outward expansion of the filter cloth F, the displacement of the filter cloth F toward the filtration surface side and the cylinder axial direction The expansion and contraction to X appears in a favorable vibration state, and the change in the crossing angle between the warp 20a and the weft 20b appears in the vibration state, and the dust collected in the filter layer 21 is moderately suppressed while agglomeration is further suppressed. Will be dispersed and crushed.

  As described above, the filter cloth structure of the present invention has been described based on the examples thereof. However, the present invention is not limited to the structures described in the above examples, and the structure is appropriately set within the scope not departing from the gist thereof. It can be changed.

  The filter cloth structure of the present invention can improve the efficiency of dust removal during the regeneration of the filter cloth, and can realize energy saving and improvement of filter cloth life by reducing the average pressure loss of the filter cloth. Therefore, it can be suitably used for a filter cloth structure used for a dust collector, and can also be used for a filter cloth structure used for various devices.

C retainer F filter cloth X cylinder axis direction of filter cloth Y cylinder circumferential direction of filter cloth 1 dust collector 20 base fabric layer 20a warp 20b weft 21 filter layer F2 cloth piece (bias piece)
31 joint location 32 joint location 33 joint location 34 joint location 35 cut location

Claims (7)

  In a filter cloth structure in which a filter cloth is attached to a retainer and used, the length of the filter cloth is shorter than the length of the filter cloth attachment portion of the retainer, and the retainer is in a state where the filter cloth is extended. A filter cloth structure characterized by being attached to the filter cloth attachment portion of the above.   2. The filter cloth structure according to claim 1, wherein the length of the filter cloth is 90 to 99% of the length of the filter cloth mounting portion of the retainer.   The filter cloth structure according to claim 1 or 2, wherein the filter cloth has a diameter of 100 to 120% of a diameter of a filter cloth mounting portion of the retainer.   The filter cloth is configured by laminating a base fabric layer made of a woven fabric and a filter layer made of a non-woven fabric, and the warp of the woven fabric constituting the base fabric layer is in a cylinder axis direction of the filter fabric. The filter cloth structure according to claim 1, 2 or 3, wherein the filter cloth structure is formed so as to cross obliquely.   The said filter cloth consists of what formed the strip-shaped cloth piece which cut | judged the filter cloth original fabric diagonally, and joined the side edges extended in the longitudinal direction, and was formed in the cylinder shape. Filter cloth structure.   The filter cloth is formed by laminating a base fabric layer made of a woven fabric and a filter layer made of a non-woven fabric, and the warp of the woven fabric constituting the base fabric layer coinciding with the axial direction of the filter cloth is stretchable 4. The filter cloth structure according to claim 1, 2 or 3, wherein the filter cloth structure is made of a material having properties.   The filter cloth structure according to claim 1, 2, 3, 4, 5 or 6, wherein the filter cloth is formed in a bottomed cylindrical shape.

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