JP6192052B2 - Dust collection filter - Google Patents

Description

  The present invention relates to a dust collecting filter.

  Conventionally, as a dust collecting filter, a filter formed in a cylindrical shape is formed by laminating a base fabric layer made of woven fabric and a filter layer made of a nonwoven fabric bonded to at least the filtration surface side of the base fabric layer. The filter cloth is filtered by passing dust-containing air from the filtration surface side to the filtration back side of the filter cloth, and passing backflow air from the filtration back side of the filter cloth to the filtration surface side. In general, a device that removes dust is widely used (see, for example, Patent Document 1).

  By the way, the filter cloth used for the filter for dust collection uses the filter cloth original fabric formed by laminating the base cloth layer made of woven cloth and the filter layer made of non-woven cloth as it is, and in the longitudinal direction thereof. The base fabric layer woven fabric is formed by weaving warps and wefts because of joining the extending side edges together to form a tubular shape, and the direction of the warp is a filter fabric formed in a tubular shape. In general, the weft direction is parallel to the cylinder axis direction and the weft direction is perpendicular to the cylinder axis direction.

Then, the dust collecting device equipped with the dust collecting filter is operated, and dust is captured by the dust collecting filter by passing the dust-containing air from the filtering surface side of the filter cloth to the filtering back surface side of the dust collecting filter. However, if dust collected on the filtration surface side of the dust collecting filter adheres due to the operation of the dust collecting device, the dust collecting filter is clogged in the filter layer and pressure loss increases.
In this case, it is necessary to remove dust adhering to the filter layer of the dust collecting filter and return to a state where the pressure loss is low. In view of this, a dust collector having a function of regenerating the dust collection filter by allowing a backflow airflow to pass from the filtration back surface side of the dust collection filter to the filtration surface side is used (see, for example, Patent Document 2). ).

However, in the filter cloth used in the conventional dust collecting filter, the warp direction is parallel to the cylinder axis direction of the filter cloth formed in a cylindrical shape, and the weft direction is orthogonal to the cylinder axis direction. Even if the filter for dust collection is vibrated or expanded / contracted, the displacement of the filter layer in the surface direction (cylinder circumferential direction) is limited by the weft, so the filter layer is moved in the surface direction (cylinder circumferential direction). The action of positive expansion and contraction did not work. That is, the configuration is not such that the filter can be positively displaced toward the filtration surface side (cylinder radial direction side) of the dust collection filter.
In addition, when such a dust collection filter is applied to a dust collector, the dust collected on the filtration surface of the dust collection filter can be removed by the passage of the backflow airflow, but the above-mentioned Thus, since the action of positively expanding and contracting the filter layer in the surface direction does not work, it is difficult to efficiently remove the dust that has entered the inside of the dust collecting filter.

  In the dust collector as described above, the efficiency of removing dust that has entered the dust collection filter cannot be improved, and the average pressure loss due to the dust collection filter gradually increases. As a result, it becomes necessary to increase the pressure of the filter or increase the number of times it is wiped off.

  On the other hand, in order to solve the above problems, the applicant previously formed a woven fabric 20 in which a base fabric layer was woven in a strip shape, spirally wound to form a cylinder, as shown in FIG. One and the other of the warp and the weft forming the woven fabric 20 of the base fabric layer formed by stitching (stitched portion 30) is the cylindrical axial direction X and the cylindrical circumferential direction of the filter cloth 10 formed in a cylindrical shape. A dust collecting filter F composed of a filter cloth 10 formed in a cylindrical shape inclined with respect to Y has been proposed (see Patent Document 3).

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

In the dust collecting filter 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 10 Displacement to the filtration 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 10 toward the filtration surface, the crossing angle between the warp and the weft in the base cloth layer of the filter cloth 10 can be changed relatively large.
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.
Accordingly, the dust collected in the filter layer is appropriately dispersed and crushed while aggregation is suppressed, and can be easily detached from the filter layer made of a nonwoven fabric.
Therefore, there is an advantage that the dust collection filter F can be obtained which can improve the dust removal efficiency and can realize the energy saving and the improvement of the filter life by reducing the average pressure loss of the dust collection filter F.
However, in the dust collecting filter F described in Patent Document 3, the base fabric layer is configured by spirally winding a woven fabric 20 woven in a band shape into a tubular shape and stitching it. There is a problem that a special sewing device or technique is required for sewing the spiral stitching portion 30.

  In view of the problems of the conventional dust collection filter, the present invention improves the efficiency of dust removal during regeneration of the dust collection filter, and saves energy by reducing the average pressure loss of the dust collection filter. An object of the present invention is to provide a dust collecting filter that can be easily manufactured without requiring a special sewing device or technique while enabling an improvement in the service life.

In order to achieve the above object, the dust collection filter of the present invention is constituted by laminating a base fabric layer made of a woven fabric and a filter layer made of a nonwoven fabric bonded to at least the filtration surface side of the base fabric layer. The filter cloth is formed into a cylindrical shape, filtered by passing dust-containing air from the filtration surface side to the filtration back side of the filter cloth, and backflow airflow from the filtration back side of the filter cloth to the filtration surface side. In the dust collection filter that allows the collected dust to pass through the filter cloth, the filter cloth is formed by laminating a base cloth layer made of woven cloth and a filter layer made of non-woven cloth. and the filter cloth raw were cut obliquely strip-shaped cloth, Ri Do from those that have been formed into a cylindrical shape by joining the side edges together to extend in the longitudinal direction, and constituting the woven base fabric layer One and the other of the warp and the weft are the cylinder axis direction and the cylinder circumference of the filter cloth formed in the cylinder shape. Inclined, characterized in Rukoto such is disposed against the direction.

  In this case, the strip-shaped cloth pieces are a plurality of strip-shaped cloth pieces obtained by obliquely cutting an original fabric formed by laminating a base fabric layer made of woven fabric and a filter layer made of nonwoven fabric, It consists of what was joined in the longitudinal direction.

  According to the dust collection filter of the present invention, the filter cloth is a strip-shaped cloth obtained by obliquely cutting a filter cloth original fabric formed by laminating a base cloth layer made of woven cloth and a filter layer made of non-woven cloth. By forming the piece into a cylindrical shape by joining the side edges extending in the longitudinal direction, the efficiency of dust removal during regeneration of the dust collection filter is improved, and the average of the dust collection filter is improved. The filter cloth can be easily manufactured without requiring a special sewing device or technology, while realizing energy saving and improvement in filter life by reducing pressure loss.

  In addition, the strip-shaped cloth pieces are a plurality of strip-shaped cloth pieces obtained by obliquely cutting an original fabric formed by laminating a base fabric layer made of woven cloth and a filter layer made of non-woven cloth. Thus, filter cloths of various lengths including a long filter cloth can be easily manufactured.

It is explanatory drawing which shows the manufacturing process of the filter cloth which comprises the filter for dust collection of this invention. It is explanatory drawing which shows the manufacturing process from which the filter cloth which comprises the filter for dust collection of this invention differs. It is explanatory drawing which shows the example from which the filter cloth which comprises the filter for dust collection differs. It is explanatory drawing which shows the manufacturing process of the filter cloth which comprises the conventional filter for dust collection.

  Hereinafter, embodiments of the filter for dust collection of the present invention will be described based on the drawings.

  Like the conventional dust collection filter, this dust collection filter is configured by laminating a base fabric layer made of woven fabric and a filter layer made of a nonwoven fabric bonded to at least the filtration surface side of the base fabric layer. The filter cloth is formed into a cylindrical shape, filtered by passing dust-containing air from the filtration surface side to the filtration back side of the filter cloth, and backflow airflow from the filtration back side of the filter cloth to the filtration surface side. , And the collected dust is removed.

  And the filter cloth 1 which comprises this filter for dust collection is 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.1 (a) and (b). A strip-shaped cloth piece (hereinafter referred to as “bias piece”) 2 obtained by obliquely cutting the filter cloth raw fabric 2A is joined to side edges extending in the longitudinal direction as shown in FIG. The joint portion 31) is formed into a cylindrical shape.

In this case, the bias piece 2 is obtained by obliquely cutting the filter cloth original fabric 2A so as to form the angles α1 and α2 with respect to the warp yarn 21 and the weft yarn 22 of the filter fabric original fabric 2A.
Here, the angles α1 and α2 are set to 15 ° to 75 °, preferably 30 ° to 60 °, and more preferably about 40 °.

And since the length dimension of the longitudinal direction of the bias piece 2 is restricted by the dimension in the width direction of the filter cloth raw fabric 2A, the long filter cloth 1 cannot often be used as it is. As shown in 1 (c), the plurality of bias pieces 2 are joined in the longitudinal direction (joining location 32) and cut at a position corresponding to the length of the filter cloth 1 (cut location 4).
Thereby, the filter cloth 1 of various lengths including the elongate filter cloth 1 can be manufactured easily.

By the way, the joining in the longitudinal direction is performed after cutting into the bias piece 2, and first, as shown in FIG. 2A, a plurality of filter cloth raw fabrics 2A are joined in the width direction (joining points 33). By setting the dimension in the width direction to a length corresponding to the length of the filter cloth 1 by the above, as shown in FIG. The bias piece 2 is joined in the longitudinal direction (joint location 33), and then, as shown in FIG. 1D, side edges extending in the longitudinal direction are joined (joint location 31) to form a cylindrical shape. It can also be formed.
Thereby, the operation | work which joins the several bias piece 2 to a longitudinal direction can be made efficient.

  Furthermore, as shown in FIG. 2A, a plurality of filter cloth original fabrics 2A are joined in the width direction (joined portion 33), and then the filter cloth original fabrics 2A are collectively cut obliquely to obtain a plurality of The end piece 2A ′ that was cut out when the bias piece 2 of the two pieces was joined in the longitudinal direction (joining point 33) was cut off on the opposite side to the length direction of the plurality of filter cloths 2A joined in the width direction. By joining (joining location 34) to the end edge, the end material 2A ′ 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 2A, for example, polyester fiber, glass fiber, etc., stitching, welding, etc. Any joining method can be selectively used.

  Here, the joining method by welding does not require a special sewing device or technique. Therefore, as shown in FIG. 3, a woven fabric 20 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 location 30A), one and the other of the warp and the weft constituting the woven fabric 20 of the base fabric layer are formed in the tubular axial direction X and the tube of the filter cloth 10A formed into a tubular shape. A dust collection filter F made of a filter cloth 10A formed in a cylindrical shape inclined with respect to the circumferential direction Y can be obtained relatively easily.

  The dust collection filter of the present invention has been described above based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations thereof are appropriately selected without departing from the scope of the present invention. It can be changed.

  The dust collection filter of the present invention improves the efficiency of dust removal during regeneration of the dust collection filter, while enabling energy saving and improvement of filter life by reducing the average pressure loss of the dust collection filter. Because it can be easily manufactured without requiring special sewing equipment and technology, it is filtered by passing dust-containing air from the filtration surface side of the filter cloth to the filtration back side, and the filter cloth has a filtration back side. It can be suitably used for a dust collection filter in which a countercurrent airflow is passed from the side to the filtration surface side and the collected dust is removed.

1 Filter cloth 2 Cloth piece (Bias piece)
31 Joint location 32 Joint location 33 Joint location 34 Joint location 4 Cutting location F Filter for dust collection

Claims (2)

A filter cloth formed in a cylindrical shape formed by laminating a base fabric layer made of a woven fabric and a filter layer made of a nonwoven fabric bonded to at least the filtration surface side of the base fabric layer. Filtering by passing dust-containing air from the filtration surface side to the filtration back surface side, and passing backflow airflow from the filtration back surface side of the filter cloth to the filtration surface side so that the collected dust is removed. In the dust collection filter, the filter cloth is a strip-shaped piece of cloth obtained by obliquely cutting a filter cloth made by laminating a base fabric layer made of woven fabric and a filter layer made of nonwoven fabric. , Ri Do from those that have been formed into a cylindrical shape by joining the side edges together to extend in the longitudinal direction, and the one and the other of the warp and weft constituting the woven fabric of the base fabric layer, is formed on the cylindrical inclined with respect to the filter cloth of the cylindrical axis and the cylindrical circumferential direction, characterized in Rukoto such is disposed a Dust filter.   A plurality of strip-shaped cloth pieces obtained by obliquely cutting an original fabric formed by laminating a base cloth layer made of woven cloth and a filter layer made of non-woven cloth, in the longitudinal direction. 2. The dust collecting filter according to claim 1, wherein the dust collecting filter is joined.

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