JP2019141832A - Pleated filter - Google Patents

Abstract

To provide a pleated filter which prevents a filter from being damaged by suppressing contraction and expansion in radial direction of the pleated filter upon dust collection and upon filter recycling operation with a one means.SOLUTION: A pleated filter includes a filter main body 2A made of felt formed pleat-shapedly in radial direction expandably/contractibly in which ridge part and valley part continue in a circumferential direction, a mouth part 3 which is provided on the one edge side in an axial direction of the filter main body and forms one end of the filter main body in the opened state, a bottom part 4 which is provided on the other end side in the axial direction of the filter main body and forms the other end of the filter main body in the closed state and a coil spring 5 which is provided in a ring state along a circumferential direction of the filter main body. Therein, each folding ridge continuing in the circumferential direction of the filter main body is arranged between windings adjacent to each other on the coil spring and the coil spring is fixed by a fixing fitting 14 at a distance of a regular interval on at least three spots in the circumferential direction of the filter main body to the coil main body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pleated filter, and more particularly, to a pleated filter that can easily remove dust collected in a pleated filter in which mountains and valleys are continuous and can obtain a long product life.

  For example, as shown in FIG. 9, in the case of a cylindrical pleated filter 51 having a mouth portion 51 a having one end opened at a cylindrical end and a bottom portion 51 b having the other end closed, The inside of the filter is sucked from 51a, and the gas or liquid outside the filter is filtered through the filter and collected. Since the filter surface has a pleated shape (mountain valley shape), dust can be collected in a wider area than a cylindrical filter without pleats.

  In the cylindrical pleated filter 51, when the dust collected on the filter surface is removed and the filter is regenerated, compressed air or liquid of a predetermined pressure is introduced into the filter from the mouth 51a, and the collecting surface (filter outer surface) ) Is removed by extruding from the back side.

Further, the cylindrical pleated filter as described above is conventionally installed as disclosed in, for example, Patent Document 1. That is, as shown in a cross-sectional view in FIG. 10, a bottom plate 55 having an annular recess is fitted to the lower end of the pleated filter 51 and is thereby closed. The lower end of the pleat filter 51 and the bottom plate 55 are fixed to each other with an adhesive.
A cover member 56 having an annular recess and having an opening at the center is fitted to the upper end of the pleated filter 51, and they are fixed to each other with an adhesive.

The pleated filter 51 to which the bottom plate 55 and the cover member 56 are attached is sandwiched and held by upper and lower beams 61 and 62. Specifically, the bottom plate 55 is fitted to the filter base 65 provided on the lower beam 61, and the cover member 56 is inserted into the concave and annular filter guide 62 a formed on the upper beam 62 via the filter packing 63. Thus, the pleated filter 51 is supported in an upright state.
Further, a cone-shaped retainer 70 is provided in the pleated filter 51 from the lower side toward the upper side to prevent the pleated filter 51 from being crushed.

By the way, in the conventional cylindrical pleated filter 51, when collecting the outer surface, when the inside of the filter is sucked from the mouth portion 51a, the filter tends to shrink and deform in the radial direction. However, when the pleated filter 51 contracts in the radial direction, the load on the connection portion between the lower end of the filter and the bottom plate 55 fixed by the adhesive and the connection portion between the upper end of the filter and the cover member 56 increases. It will be damaged.
For this reason, conventionally, a retainer 70 having a shape as shown in FIG. 10 or a cylindrical bowl-like retainer (not shown) as disclosed in Patent Document 2 suppresses deformation of the filter, and loads are applied to the connecting portions. It is made so that it won't be applied.

  Thus, in the conventional cylindrical pleated filter, the retainer restrains deformation against radial contraction.

  The pleated filter is regenerated by introducing compressed air or liquid into the pleated filter 51 and removing dust collected by the pleated filter. At this time, there is a problem that pressure is not uniformly applied in the filter, and only a part of the collected dust can be peeled off (removed). In particular, in the case of dust collected in the valleys of the pleats or dust containing a large amount of oil, it was not possible to expect the effect of removing with compressed air.

  For this reason, conventionally, during maintenance, the cylindrical pleat filter 51 is removed, and a human work is performed to remove dust by injecting compressed air such as an air gun or high-pressure liquid. However, the human work performed by removing the cylindrical pleated filter 51 is inefficient and undesirable.

  Further, as a method of removing dust without removing the cylindrical pleat filter 51, increasing the compressed air pressure (compressed air amount) or high-pressure liquid (water pressure flow rate) sent into the pleated filter 51 can be mentioned. It is done.

  However, the pleated filter 51 may bulge outward due to the compressed air and the high-pressure liquid, and the shape may be greatly deformed. The connection between the lower end of the filter and the bottom plate 55 fixed with an adhesive, and the upper end of the filter and the cover There is a possibility that the load on the connection portion with the member 56 increases and the connection portion is damaged.

As a solution to the above problem, Patent Document 3 discloses a structure that can prevent deformation of the shape due to outward bulging of the filter body.
In the pleated filter disclosed in Patent Document 3, the coil spring is spirally wound in the circumferential direction, and each fold mountain continuous in the circumferential direction of the filter body is disposed between adjacent windings in the coil spring, And the structure which suppresses expansion | swelling to the radial direction of the said coil spring with the reinforcement wire wound by the filter circumferential direction is provided.
The pleated filter is restrained from being deformed by the inner sleeve (support) against contraction in the radial direction.

JP-A-10-230121 JP 2012-86119 A U.S. Pat. No. 2,988,227

As described above, in a cylindrical pleated filter, by providing a retainer 70 as shown in FIG. 10 or a cylindrical bowl-shaped retainer as disclosed in Patent Document 2, an excessive amount of Deformation can be suppressed, and breakage of the filter connecting portion can be prevented.
However, when a retainer (inner sleeve (support)) is provided in the filter, there is a problem that when the pleated filter contracts, the filter inner surface and the retainer outer surface are rubbed and the filter surface is damaged.

  Further, even when the expansion of the pleated filter in the radial direction can be suppressed by the configuration disclosed in Patent Document 3 during the filter regeneration operation, the inner surface of the filter and the inner sleeve (support) when the pleated filter contracts. There was a problem that the filter surface was damaged due to rubbing. Further, the invention described in Patent Document 3 achieves the suppression of the expansion and contraction in the radial direction of the pleated filter by separate members (reinforcing wire and inner sleeve), and causes a new problem that the cost increases. It was something to be made.

  In order to solve these problems, the inventor does not provide a retainer (inner sleeve (support)) in the filter, and achieves suppression of radial expansion and contraction of the pleated filter by one means. Based on this premise, the inventors have intensively researched and completed the present invention.

  The present invention has been made paying attention to the above-described points, and in the cylindrical pleated filter, the suppression of the radial contraction of the pleat filter during the dust collection and the filter regeneration work, and the suppression of the expansion, It is an object of the present invention to provide a pleated filter that prevents damage to the filter by achieving the above by one means.

  In order to solve the above-described problem, a pleated filter according to the present invention is a pleated filter that collects dust on the outer surface or inner surface of a cylindrical filter, and has a pleated shape in which crests and valleys are continuous in a circumferential direction and in a radial direction. A filter main body made of felt formed to be extendable and contracted, a mouth provided on one end side in the axial direction of the filter main body, and having one end of the filter main body open, and the other end in the axial direction of the filter main body And a coil spring provided in a ring shape along the circumferential direction of the filter body, and is continuous in the circumferential direction of the filter body. Each fold mountain is disposed between adjacent windings in the coil spring, and is equidistant at at least three locations in the circumferential direction of the filter body. The coil spring is characterized in that it is fixed by the fixing bracket to the filter body.

  According to the present invention, a large contraction deformation of the filter body is suppressed by one means of fixing the coil pulling to the filter body by the fixing bracket at equal intervals in at least three places in the filter circumferential direction. Therefore, the pleated filter can be prevented from being damaged.

In addition, since the coil springs are fixed to the filter body with fixing brackets at equal intervals in the circumferential direction of the filter body, abnormal deformation of the pleated filter in the radial direction (for example, deformation into an elliptical shape) is suppressed. it can.
In addition, the coil springs provided on the outer peripheral surface of the filter body allow the pleat folds to be evenly spaced, so that dust can be efficiently collected from the entire outer peripheral surface of the filter body, and in the filter regeneration work, Dust adhering to the outer surface can be effectively removed.

Here, it is desirable that the coil springs provided in a ring shape along the circumferential direction of the filter main body are three coil springs having the same length dimension.
When the coil spring is composed of four or more coil springs, and these coil springs are fixed to the filter body and the fixing bracket (fixed at four or more locations), not only the manufacturing cost increases, but also the inconvenience. When a uniform force is applied, abnormal deformation in the radial direction of the pleated filter (for example, deformation into an elliptical shape) is likely to occur.
For this reason, it is preferable that three coil springs having the same length dimension are fixed to the filter body by fixing brackets at three locations in the circumferential direction of the filter body.

Further, it is desirable that the coil spring provided in the ring shape is provided in a central portion in the axial direction of the filter body and in a plane perpendicular to the axial direction of the filter body.
As described above, when the coil spring is provided in a central portion in the axial direction of the filter body and in a plane perpendicular to the axial direction of the filter body, the filter body has the largest contraction deformation, Since the portion causing the expansion deformation can be suppressed, abnormal deformation in the radial direction of the pleat filter can be suppressed, and damage to the pleat filter can be prevented.

  In addition, the fixing bracket includes a pair of plate-shaped portions connected at the upper end portion, and a fixing bracket main body in which a through-hole for inserting a rivet is formed in the plate-shaped portion, and a through hole and a filter of the fixing bracket main body The rivet is inserted into a through hole formed in the main body, and fixes the fixing metal body to the filter main body. A fold mountain of the filter main body and a coil spring are sandwiched between the pair of plate-like portions, and the pair of plates It is preferable that the coil spring is fixed to the filter body by fixing the shape portion to the filter body by a rivet.

  In this way, the folds of the filter body and the coil spring are sandwiched between the pair of plate-like parts, and the pair of plate-like parts are fixed to the filter body by the rivets, so that the folds of the filter body are closed. Press contact. As a result, it is possible to prevent the liquid and gas flowing through the filter body from leaking between the through hole formed in the filter body and the rivet.

  The mouth portion includes a snap ring, an upper cover cloth that covers the snap ring and forms an opening, and is sewn and connected to one end of the filter body. A bottom cloth that closes the other end of the filter body, and one end part is sewn and connected to cover the peripheral edge of the bottom cloth, and the other end part is sewn and connected to the other end of the filter body. It is desirable to have a lower cloth.

  In this way, the snap ring and the filter body are connected via the upper cloth cloth sewn to one end of the filter body, and the bottom cloth is connected via the lower cloth cloth sewn to the other end of the filter body. Since the filter main body is connected, damage to the mouth portion and the bottom portion can be suppressed even when the filter main body is contracted or expanded.

  The mouth portion is sewn to the snap ring, the upper cloth covering the snap ring to form an opening, the upper cloth and the filter body, and connects the upper cloth and the filter body. And a bottom cloth that closes the other end of the filter body, a lower abutment covering a peripheral edge of the bottom cloth, and one end portion of the bottom cloth and the bottom cloth. It is desirable that the lower cloth is sewn, the other end is sewn to the other end of the filter main body, and the bottom cloth and a cloth tape for connecting the other end of the filter main body are included.

  In this way, the snap ring and the filter body are connected via the upper cloth and cloth tape sewn to one end of the filter body, and the lower cloth and cloth tape sewn to the other end of the filter body. Since the bottom cloth and the filter main body are connected to each other, damage to the mouth part and the bottom part can be suppressed even when the filter main body is contracted or expanded.

Further, it is desirable that no retainer is provided in the filter body.
As described above, since the large contraction deformation of the filter main body is suppressed and the large expansion deformation of the filter main body is suppressed, it is not necessary to provide a retainer inside the filter, and the problem of rubbing between the filter inner surface and the retainer is also eliminated. Therefore, the filter life can be made longer than before.

  According to the present invention, in a cylindrical pleated filter, by suppressing the contraction in the radial direction of the pleat filter during the dust collection and the filter regeneration operation and the suppression of the expansion by one means, the filter It is possible to obtain a pleated filter that prevents breakage of the pleat.

FIG. 1 is a side view showing an embodiment of a pleated filter according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 (a) and 3 (b) are perspective views of a fixing fitting provided in the pleated filter of FIG. FIG. 4 is a perspective view showing a state in which the coil spring is fixed to the pleated filter by the fixing bracket provided in the pleated filter of FIG. FIGS. 5A and 5B are schematic diagrams for explaining the deformation of the filter main body to which the coil spring is connected by the fixing metal fitting of FIG. 6 is an enlarged view showing a partial cross section in the radial direction of the pleated filter of FIG. FIG. 7 is a partially enlarged cross-sectional view of the mouth of the pleated filter of FIG. FIG. 8 is a partially enlarged cross-sectional view of the bottom of the pleated filter of FIG. FIG. 9 is a perspective view of a conventional pleated filter. FIG. 10 is a cross-sectional view of a conventional pleated filter.

  Embodiments of a pleated filter according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of a pleated filter according to the present invention. In this embodiment, the case of outer surface filtration that collects dust on the outer surface of the filter will be described as an example. FIG. 2 is a cross-sectional view taken along the line AA of FIG.

A pleated filter 1 shown in FIG. 1 has a cylindrical body part 2, a mouth part 3 opened on one end side of the body part 2, and a bottom part 4 provided on the other end side of the body part 2. The body portion 2 includes a pleated filter body 2A in which peaks and valleys are continuous in a cylindrical circumferential direction. The filter main body 2A is, for example, any one of polyester, polypropylene, nylon, acrylic, PPS (polyphenylene sulfide), meta-aramid (heat resistant nylon), polyimide fiber (for example, P84 (registered trademark)), and PTFE (polytetrafluoroethylene). It is formed using the felt formed using the material. Even if the filter body 2A is deformed, it is desirable that the felt has a thickness of 1.25 mm, a density of 430 mg / m ² , and a tensile strength of 90 daN / 5 cm or more in order to facilitate the restoration of the pleated shape.

More specifically, the filter body 2A is formed by compressing the felt and folding it into a pleat shape, which is formed into a cylindrical shape. Therefore, the AA arrow cross section of the filter main body 2A has a shape in which a plurality of peaks and valleys (mountains 2a and valleys 2b) are continuously ring-shaped as shown in FIG. The height of the valley in the thickness direction of the filter body is, for example, about 25 mm.
Further, since the filter body 2A is formed of felt, the filter body 2A is excellent in stretchability and configured to be greatly stretchable in the radial direction.

  As shown in FIGS. 1 and 2, in the body portion 2, a coil spring is formed on the outer peripheral surface of the filter main body 2 </ b> A in a ring shape having the same diameter as the filter main body 2 </ b> A along the circumferential direction of the filter main body 2 </ b> A. 5 is provided. Preferably, as shown in FIG. 6, each fold mountain 2 a continuous in the circumferential direction of the filter main body 2 </ b> A is disposed between adjacent windings 5 a in the coil spring 5. Thereby, even if the filter main body 2A expands and contracts, the folds of the pleats can be maintained at equal intervals.

Further, the coil spring 5 provided in a ring shape is provided in a central portion in the axial direction of the filter main body 2A and in a plane perpendicular to the axial direction of the filter main body 2A (on the same vertical surface). Yes.
When the coil spring 5 is provided in a central portion in the axial direction of the filter body 2A and in a plane perpendicular to the axial direction of the filter body 2A (on the same vertical plane), the filter spring 5 It is preferable because the largest contraction deformation and expansion deformation of the main body 2A can be suppressed, abnormal deformation in the radial direction of the pleat filter can be suppressed, and damage to the pleat filter can be prevented.

In this coil spring 5, one coil spring 5 may be fixed to the filter main body 2A by the fixing bracket 15 at substantially equal (equal intervals) positions in at least three places, but as shown in FIG. It is preferable that at least three coil springs 5A, 5B, 5C having the same length dimension are fixed by the fixing bracket 15.
That is, as shown in FIG. 2, it is preferable that the end portions of at least three coil springs 5 are fixed to the filter body 2A by the fixing bracket 15 at at least three locations in the circumferential direction. Note that at least three positions fixed by the fixing bracket 15 are substantially equal (equally spaced) positions along the circumferential direction as shown in the figure. 1 and 2 show the case of three coil springs 5 having the same length dimension.

As shown in FIG. 3A, each fixing bracket 15 includes a fixing bracket main body 15A having an inverted V-shaped cross section, and a rivet 15B for fixing the fixing bracket main body 15A to the filter main body 2A. .
In the example illustrated in FIG. 3, the fixing metal body 15 </ b> A has a pair of plate-like portions 15 </ b> A <b> 1 and 15 </ b> A <b> 2 connected at the upper end. Further, through holes 15A1a, 15A1b, 15A2a, 15A2b for inserting rivets are formed in the plate-like portions 15A1, 15A2.

Further, a notch portion 15A3 for leading the sandwiched coil spring 5 to the outside is formed at the upper end portion of the fixing bracket main body 15A, and similarly, a notch portion 15A4 is formed at the lower end portion.
The notch 15A3 and the notch 15A4 are configured so that they can be properly used as needed when the sandwiched coil spring 5 is led out.
Further, as shown in FIG. 3B, the rivet 15B includes a head and a shaft portion, and the shaft portion includes through holes 15A1a, 15A1b, 15A2a, 15A2b and a through hole 2c formed in the filter body 2A (see FIG. 3B). 2A), and the end portion of the inserted shaft portion is crushed to fix the fixing metal body 15A to the filter body 2A.

  In order to fix the coil spring 5 to the filter main body 2A by the fixing bracket 15, first, the coil spring 5 is arranged along the circumferential direction on the outer peripheral surface of the filter main body 2A, and the filter main body 2A as shown in FIG. Each fold mountain 2 a continuous in the circumferential direction is arranged between adjacent windings 5 a in the coil spring 5.

Next, as shown in FIG. 4, the fixing bracket main body 15A is put on the folding mountain 2a of the filter main body 2A. Thereby, the end of the coil spring 5 (coil springs 5A, 5B, 5C) is sandwiched between the filter body 2A and the pair of plate-like portions 15A1, 15A2.
Subsequently, the first rivet 15B is passed through the through hole 15A1a and the through hole 15A2a, and the second rivet 15B is passed through the through hole 15A1b and the through hole 15A2b.

Then, the two rivets 15B of the two rivets 15B are sandwiched between the pair of plate-like portions 15A1 and 15A2 and the folds 2a of the filter body 2A and the ends of the coil springs 5 (coil springs 5A, 5B, 5C). By crushing both ends, the pair of plate-like members 15A1 and 15A2 are pressed against the filter main body 2A from both sides, and the fold mountain 2a of the filter main body 2A is closed and pressed against each other.
The coil spring 5 is sandwiched between a pair of plate-like members 15A1 and 15A2 and is fixed to the filter body 2A.

Thus, the fold mountain of the filter body 2 and the coil springs 5A (5) and 5C (5) are sandwiched between the pair of plate-like portions 15A1 and 15A2, and the pair of plate-like portions 15A1 and 15A2 are rivets. The coil springs 5A (5) and 5C (5) are fixed to the filter body 2A by being fixed to the filter body 2A by 15B.
Similarly, the coil springs 5 are fixed to the filter body 2A at at least three locations at equal intervals in the circumferential direction of the filter body 2A.

Further, as described above, the fold mountain 2a of the filter main body 2A and the coil spring 5 are sandwiched between the pair of plate-like portions 15A1 and 15A2, and the pair of plate-like portions 15A1 and 15A2 are connected to the filter main body 2A by the rivets 15B. Therefore, the fold 2a of the filter body 2A is closed and brought into a pressure contact state.
As a result, it is possible to prevent liquid and gas flowing through the filter body 2A from leaking from between the through hole 2c formed in the filter body 2A and the rivet 15B.

As described above, it is desirable that the fixing brackets 15 are arranged at equal positions (equal intervals) in the filter circumferential direction.
For example, as shown in FIG. 5 (b), when the fixtures 15 are arranged at non-uniform (equal intervals) in the filter circumferential direction, the contraction amount of each coil spring between the fixtures 15, Since the extension amount is different and the repulsive force and contraction force are also different, the coil spring 5 cannot maintain the ring shape as a whole, and abnormal deformation in the radial direction of the pleat filter occurs, for example, an elliptical shape. This is not preferable because it is easy and the filtration performance may be reduced.

  On the other hand, for example, as schematically shown in FIG. 5A, when the fixing bracket 15 is arranged at equal (equal intervals) positions in the filter circumferential direction, a coil spring between the fixing brackets 15 is used. The amount of contraction and expansion of the coil spring 5 are substantially the same, and the repulsive force and contraction force associated therewith are also substantially the same. Therefore, the coil spring 5 can maintain the ring shape as a whole and can suppress abnormal deformation, which is preferable.

In addition, when four or more positions are fixed at equal (equal intervals) positions, the manufacturing cost increases. Therefore, coil springs are fixed to the filter body 2A at three positions in the circumferential direction of the filter body 2A. More preferably, it is fixed by 15.
On the other hand, if the number of the fixing brackets 15 provided in the filter circumferential direction is one or two, the coil spring 5 and the filter body 2A are easily separated between the fixing brackets 15 in labor. As a result, the filter main body 2A is liable to be crushed, and there is a possibility that the filtration performance is deteriorated.

In particular, it is more preferable that three coil springs 5A, 5B, 5C having the same length are fixed to the filter body 2A by the fixing bracket 15.
As described above, when the three coil springs 5A, 5B, 5C having the same length are fixed to the filter body 2A by the fixing bracket 15, the mounting work can be easily performed and the fixing bracket is fixed. Separation of the coil spring 5 and the filter body 2A between 15 can be suppressed, and abnormal deformation of the filter body 2A can be suppressed.

  Then, as shown in FIG. 5A, when the force is released from the outside of the filter to the inside in the radial direction (that is, the direction in which the filter contracts) for collecting dust, the coil spring 5 (5A, 5B, 5C) is released. ) Elastic force (repulsive force, contraction force).

FIG. 7 is an enlarged cross-sectional view of a part of the mouth portion 3 (region Ar <b> 1 in FIG. 1) in the pleated filter 1. As shown in FIG. 7, the mouth portion 3 includes a ring-shaped metal snap ring 6 (retaining ring) having a diameter substantially the same as that of the body portion 2. Further, an upper cloth 7 that wraps the snap ring 6 to form a connecting portion (open mouth) with a dust collector (not shown), and a cloth tape for connecting the upper cloth 7 and the filter body 2A. 8.
The upper cloth 7 is made of felt made of the same material as the filter main body 2A, and has a thickness of 1.6 mm, a density of 500 mg / m ² , and a tensile strength of 120 daN / 5 cm. The fabric tape 8 is formed of a woven fabric formed using the same raw materials as the filter body 2A, and has a thickness of 0.9 mm, a density of 340 mg / m ² , and a tensile strength of 100 daN / 5 cm. Each member is connected by sewing, and in FIG. 7, a portion indicated by a broken line indicates a place where sewing is performed. The thread used for sewing is a 20th thread formed using the same raw material as the filter main body 2.

FIG. 8 is an enlarged cross-sectional view of a part of the bottom 4 (region Ar <b> 2 in FIG. 1) in the pleated filter 1. As shown in FIG. 8, the bottom portion 4 includes a disc-shaped bottom cloth 9 for closing the other end of the body portion 2, and a cloth tape for connecting the bottom cloth 9 and the filter body 2A. 10 and. Further, a lower application cloth 11 is provided around the cloth tape 10 at the peripheral edge of the bottom cloth 9 as a reinforcing material. Each member is connected by sewing, and in FIG. 7, a portion indicated by a broken line indicates a place where sewing is performed.
In addition, the thread | yarn used for sewing is a 20th thread | yarn formed using the same raw material as 2 A of filter main bodies. The bottom cloth 9 is made of felt made of the same material as the filter body 2A, and has a thickness of 1.6 mm, a density of 500 mg / m ² , and a tensile strength of 120 daN / 5 cm. The fabric tape 10 is formed of a woven fabric formed using the same raw material as the filter body 2A, and has a thickness of 0.9 mm, a density of 340 mg / m ² , and a tensile strength of 100 daN / 5 cm.

When the pleated filter 1 configured in this way is used, the mouth portion 3 is connected to a dust collector (not shown) to drive the dust collector. When this pleated filter 1 is used as a filter for external filtration, air (or liquid) in the filter body 2A is sucked from the mouth 3.
The suction from the inside of the filter causes the filter body 2A to contract in the radial direction together with the contraction of the coil spring 5 connected at three points in the circumferential direction, but maintains the pleated shape of the filter body 2A, and the elasticity of the coil spring 5 The dust is collected on the outer surface of the filter without being crushed into an elliptical shape by force.
Further, since the mouth portion 3 and the bottom portion 4 are respectively connected to the filter main body 2A by sewing, even if the filter main body 2A is greatly contracted and deformed, the connecting portion is not damaged. Further, since the inside of the filter body 2A is hollow and does not include a retainer as in the prior art, the problem of rubbing with the retainer can be eliminated even if the filter body 2A contracts.

  By this dust collection operation, contaminated air or contaminated liquid outside the filter is filtered from the outer peripheral surface side of the filter main body 2A and enters the filter main body 2A, and the filtered air or liquid is discharged (suctioned) out of the filter. ). In this way, dust adheres to the outer surface of the pleated filter and is collected. At this time, as described above, the filter main body 2A contracts in the radial direction, but is suppressed by the coil spring 5 from contracting within a certain range.

When the dust collection operation is completed and the filter regeneration operation is performed to remove dust adhering to the filter outer surface of the pleated filter 1, compressed air (or high-pressure liquid) is introduced into the filter from the mouth portion 3, contrary to dust collection. Sent out.
When compressed air (or high-pressure liquid) is delivered into the filter body 2A, the pleats spread and the filter body 2A expands and deforms in the radial direction. Here, the outer peripheral surface of the filter body 2A is connected to at least three points in the filter circumferential direction and is provided with a coil spring 5 extending in the circumferential direction, so that the pleat folds are maintained at equal intervals. Inflates with.
Further, the expansion of the filter body 2 </ b> A is suppressed by the coil spring 5 from expanding within a certain range.

Moreover, since the mouth part 3 and the bottom part 4 are each connected with the filter main body 2A by sewing as described above, even if the filter main body 2A expands and deforms, the connecting part is not damaged.
Thus, at the time of filter regeneration, dust adhering to the outer surface of the filter body 2A is effectively wiped off by the expansion of the filter body 2A, and clogging does not occur. As a result, long-term use becomes possible. . Further, when the feeding into the filter is completed, the pleated shape of the filter body 2A is restored to the original shape by the elastic force of the coil spring 5.

As described above, according to the embodiment of the present invention, each fold mountain continuous in the circumferential direction of the filter body is disposed between adjacent windings in the coil spring, and at least in the circumferential direction of the filter body. The coil springs are fixed to the filter body with fixing brackets at equal intervals at three positions.
As a result, a large (abnormal) contraction deformation of the filter body is suppressed by one means of fixing the coil pulling to the filter body with a fixing bracket at equal intervals in at least three locations in the filter circumferential direction. Since large (abnormal) expansion deformation of the main body is suppressed, damage to the pleated filter can be prevented.

In addition, since the coil spring is fixed to the filter body by a fixing bracket at equal intervals in the circumferential direction of the filter body, abnormal deformation in the radial direction of the pleated filter can be suppressed.
In addition, the coil springs provided on the outer peripheral surface of the filter body allow the pleat folds to be evenly spaced, so that dust can be efficiently collected from the entire outer peripheral surface of the filter body, and in the filter regeneration work, Dust adhering to the outer surface can be effectively removed.

Further, in the filter body 2A, the felt is compressed and formed into a pleat shape to give a wide area and elasticity, and the connection between the filter body, the mouth portion and the bottom portion is all made by sewing, and the circumferential direction of the filter body A ring-shaped coil spring is disposed along the coil spring, and the coil pulling and the filter main body are fixed by at least three fixing fittings that are arranged substantially evenly.
Thus, even when the filter body 2A is greatly contracted and deformed during dust collection, the connecting portion between the filter body, the mouth portion and the bottom portion is not damaged, and the filter body is efficiently collected without collapsing into an elliptical shape. It is possible to dust, and the life of the filter can be made longer than before.

  In the above embodiment, the case where the coil spring provided in the ring shape is provided in a central portion in the axial direction of the filter main body and in a plane perpendicular to the axial direction of the filter main body has been described. However, a plurality of coil springs may be provided in a ring shape in parallel in the axial direction.

Moreover, in the said embodiment, in connection with an opening | mouth part and a filter main body, the upper contact cloth which covers the snap ring of an opening | mouth part shall be connected to a filter main body by sewing via cloth tape.
However, in this invention, it is not limited to the form, For example, you may comprise so that the upper cloth which covers the snap ring of a mouth part may be directly connected with a filter main body by sewing.

Similarly, in the embodiment described above, the bottom cloth and the filter main body are connected to the filter main body by sewing with a lower cloth covering the peripheral edge of the bottom cloth and a cloth tape.
However, in this invention, it is not limited to the form, For example, you may comprise so that a lower bottom cloth may be directly connected with the filter main body 2A by sewing.

  Moreover, in the said embodiment, although the case where it uses for outer surface filtration which collects dust on a filter outer surface was demonstrated, in the case of the pleated filter shown in FIG. The liquid may be sent into the filter and used for inner surface filtration for collecting dust on the inner surface of the filter.

  In the mouth portion shown in the above embodiment, the snap ring is covered with the upper cloth to form the opening. However, the present invention is not limited to this configuration. For example, although not shown, a ring-shaped O-ring (for example, a thickness of 4 to 5 mm) having substantially the same diameter as that of the body portion may be used instead of the snap ring. The material of the O-ring is not particularly limited. For example, a metal such as iron or a resin such as plastic or rubber can be used.

DESCRIPTION OF SYMBOLS 1 Pleated filter 2 Body part 2a Mountain part 2b Valley part 2A Filter body 3 Mouth part 4 Bottom part 5 Coil spring 5A Coil spring 5B Coil spring 5C Coil spring 6 Snap ring 7 Upper cloth 8 Tape 9 Bottom cloth 10 Tape 11 Lower cloth 15 Fixing bracket 15A Fixing bracket body 15A1 Plate-like portion 15A2 Plate-like portion 15B Rivet

In order to solve the above-described problem, a pleated filter according to the present invention is a pleated filter that collects dust on the outer surface or inner surface of a cylindrical filter, and has a pleated shape in which crests and valleys are continuous in a circumferential direction and in a radial direction. A filter main body made of felt formed to be extendable and contracted, a mouth provided on one end side in the axial direction of the filter main body, and having one end of the filter main body open, and the other end in the axial direction of the filter main body A bottom portion formed on the side and formed in a state in which the other end of the filter body is closed ; and three coil springs having the same length dimension disposed along the circumferential direction of the outer peripheral surface of the filter body; a fixing bracket body through hole for the rivet insertion is formed on the pair of plate-like portion is inserted into the through hole and the through hole formed in the filter body of the fixing bracket body, a fixing bracket body Includes a rivet that fixes the filter body, the fixing bracket having a respective crease continuous in the circumferential direction of the filter body is disposed between the windings adjacent in the coil spring, the outer periphery of the filter body A pair of plate-like portions of the fixing bracket main body are arranged at three equally spaced distances in the circumferential direction of the surface, and the fold mountain of the filter main body and the end of the coil spring are disposed between the pair of plate-like portions. And the end portions of the three coil springs are fixed to the filter main body by the pair of plate-like portions being fixed to the filter main body by rivets, and the filter main body is fixed by the three coil springs. One ring-shaped coil spring is formed in the circumferential direction of the outer peripheral surface .

In particular, three coil springs having the same length are arranged along the circumferential direction of the filter body, and the ends of the three coil springs are fixed to the filter body by a fixing bracket.
When four or more coil springs are fixed to the filter body and the fixture (when fixed at four or more locations), not only does the manufacturing cost increase, but when unequal force is applied, Abnormal deformation in the radial direction of the filter (for example, deformation into an elliptical shape) tends to occur.
Therefore, at three locations in the circumferential direction of the filter body, three coil springs having the same length dimension are fixed to the filter body by a fixing bracket .
Further, the fixing bracket is inserted into a fixing bracket main body in which a through hole for inserting a rivet is formed in a pair of plate-shaped portions, and a through hole formed in the through hole of the fixing bracket main body and the filter main body. Each of the folds continuous in the circumferential direction of the filter body is disposed between adjacent windings in the coil spring, and is arranged in the circumferential direction of the outer circumferential surface of the filter body. The pair of plate-like portions are arranged at three equally spaced distances, and the fold mountain of the filter body and the end of the coil spring are sandwiched between the pair of plate-like portions, and the pair of plate-like portions The end portion of the three coil springs is fixed to the filter body by fixing the portion to the filter body by a rivet, and the filter book is fixed by the three coil springs. The outer peripheral surface in the circumferential direction one looped coil spring is formed.
In this way, the folds of the filter body and the coil spring are sandwiched between the pair of plate-like parts, and the pair of plate-like parts are fixed to the filter body by the rivets, so that the folds of the filter body are closed. Press contact. As a result, it is possible to prevent the liquid and gas flowing through the filter body from leaking between the through hole formed in the filter body and the rivet.

Here, it is desirable that the coil spring provided in the ring shape is provided in a central portion in the axial direction of the filter body and in a plane perpendicular to the axial direction of the filter body.
As described above, when the coil spring is provided in a central portion in the axial direction of the filter body and in a plane perpendicular to the axial direction of the filter body, the filter body has the largest contraction deformation, Since the portion causing the expansion deformation can be suppressed, abnormal deformation in the radial direction of the pleat filter can be suppressed, and damage to the pleat filter can be prevented.

Claims (7)

A pleated filter that collects dust on the outer or inner surface of a cylindrical filter,
A filter body comprising a felt formed in a pleated shape in which crests and valleys are continuous in the circumferential direction and expandable in the radial direction;
Provided on one end side in the axial direction of the filter main body, and a mouth portion in which one end of the filter main body is formed in an open state;
A bottom portion provided on the other end side of the filter body in the axial direction and formed in a state in which the other end of the filter body is closed;
A coil spring provided in a ring shape along the circumferential direction of the filter body;
With
Each fold mountain continuous in the circumferential direction of the filter body is disposed between adjacent windings in the coil spring,
The pleated filter, wherein the coil spring is fixed to the filter body with a fixing bracket at equal intervals in at least three locations in the circumferential direction of the filter body. A coil spring provided in a ring shape along the circumferential direction of the filter body,
2. The pleated filter according to claim 1, wherein the pleated filter has three coil springs having the same length.   The coil spring provided in a ring shape is provided in a central portion in the axial direction of the filter body and in a plane perpendicular to the axial direction of the filter body. 2. The pleated filter according to 2. The fixing bracket is
A pair of plate-like parts are connected at the upper end, and a fixing metal body in which a through-hole for inserting a rivet is formed in the plate-like part,
It is inserted into the through hole of the fixing bracket body and the through hole formed in the filter body, and comprises a rivet that fixes the fixing bracket body to the filter body.
A fold and a coil spring of the filter main body are sandwiched between the pair of plate-like portions, and the pair of plate-like portions are fixed to the filter main body by rivets, whereby the coil spring is fixed to the filter main body. The pleated filter according to any one of claims 1 to 3, wherein the pleated filter is provided. The mouth is
Snap ring,
Covering the snap ring and forming an opening; and an upper top cloth sewn and connected to one end of the filter body;
Have
The bottom is
A bottom cloth that closes the other end of the filter body;
One end portion covers the peripheral edge of the bottom cloth and is sewn and connected, and the other end portion is sewn and connected to the other end of the filter body,
The pleated filter according to claim 1, comprising: The mouth is
Snap ring,
An upper cloth covering the snap ring to form an opening;
A cloth tape that is sewn to the upper application cloth and the filter body, and connects the upper application cloth and the filter body;
Have
The bottom is
A bottom cloth that closes the other end of the filter body;
A lower application cloth covering the peripheral edge of the bottom cloth;
One end is sewn to the bottom cloth and the lower cloth, the other end is sewn to the other end of the filter body, and a cloth tape that connects the bottom cloth and the other end of the filter body,
The pleated filter according to claim 1, comprising:   The pleated filter according to claim 1, wherein a retainer is not provided in the filter body.

Images