JP6401014B2 - Cartridge filter - Google Patents

Description

  The present invention relates to a cartridge filter for filtering and cleaning fluid, and more particularly to a technique capable of separately collecting and collecting end caps and cores constituting a cartridge filter and used filter media.

  2. Description of the Related Art Conventionally, as a fluid filtration device, many device configurations in which a filter medium can be exchanged are known. Particularly, a sheet-like fabric made of, for example, a nonwoven fabric or a woven fabric around a cylindrical porous core, and various types of synthesis. A membrane filter made of resin, or a cartridge filter wound with a string-like or band-like filter material is widely used. As is well known, there are a variety of fluids to be filtered by cartridge filters, and they are used in a wide range of practical applications such as dust and other gas applications, pure water production, and liquid applications in which functional components are attached to filter media. Has been.

  The present applicant has also proposed various cartridge filters. For example, in Japanese Unexamined Patent Application Publication No. 2014-173868 (hereinafter referred to as Patent Document 1), a fluid such as a gas or liquid contaminated with a radioactive substance is used. A technique for removing radioactive material is disclosed. In this disclosed technology, a plurality of columnar members each configured by winding a sheet-like porous body are arranged in a cylindrical member via a disk-like porous body, and the sheet-like porous body includes, for example, zeolite, activated carbon, bitumen ( A radioactive substance adsorbing component such as Prussian blue). As a preferred embodiment disclosed in Patent Document 1, referring to [FIG. 1] in [0043] to [0047] of Patent Document 1, a sheet-like porous body carrying a radioactive substance adsorbing component is made non-liquid-permeable. An example in which a cylindrical member is wound around a rod-shaped member is described. Although this rod-shaped member is not an essential component, there is a disclosure that when the sheet-like porous body is wound, the clearance formed at the winding center can be eliminated. A plurality of cylindrical members thus prepared are housed in a cylindrical member, and one of the two main surfaces formed by winding serves as a fluid inflow path, and the other main surface After becoming the outflow path, the fluid is sequentially cleaned by passing through the disk-like porous body and reaching the main surface of the other cylindrical member. At this time, the cylindrical member stirs and homogenizes the fluid, and can prevent the occurrence of a short path between the cylindrical members (see [0013] of Patent Document 1).

  In patent document 1 mentioned above, it is possible to perform highly accurate decontamination with various radioactive substance adsorption components. In addition, as reported in the media, filter media after adsorbing radioactive material must be managed and stored in an intermediate storage facility until final processing. Therefore, in view of the current situation, reduction or volume reduction (hereinafter sometimes simply referred to as recycling) of radioactive waste generated by decontamination is a social request. For this reason, the inventor according to the present application reexamined the recycling technology for the used cartridge filter that can become such radioactive waste.

  As such a recycling technique, Japanese Patent Application Laid-Open No. 2001-104716 (hereinafter referred to as Patent Document 2) discloses a proposal of application examples such as filtration of a solvent used in a dry cleaning machine or purification of lubricating oil of an internal combustion engine. Has been. In order to facilitate understanding of the description, a device for fluid filtration having a substantially cylindrical shape, such as the “filter element” referred to in Patent Document 2, is comprehensively described as a “cartridge filter”. A device in which the “cartridge filter” is mounted and used is referred to as a “filtration device”. [FIG. 1] to [FIG. 3] of Patent Document 2 include, as described in [0057], a support made of metal such as synthetic resin, stainless steel, aluminum, and the like and zigzag bent. A pair of ring disc-shaped end caps that support both ends of the support, a filter medium made of a non-woven fabric that is arranged along the surface of the support and is bent in the same manner as the support, and A nonwoven fabric net covering the surface of a filter medium is disclosed. In addition, a form in which planar fasteners are detachably attached to both ends of the net (see [0070], [FIG. 2] and [FIG. 11]) is disclosed, and by adopting such a basic configuration, a support body is disclosed. And end caps are described as being able to be used multiple times, ie recycled.

  Furthermore, in [0099] to [0104] of Patent Document 2, referring to [FIG. 23] to [FIG. 26], the size of the foreign matter mixed in the fluid is a minute one in micron units. Another embodiment is disclosed in which the fluid is not leaked from the gap between the end cap and the filter medium, and the hermeticity is improved. In this embodiment, a cylindrical shaft center is provided between the pair of end caps described above, and a number of holes are formed in the shaft center. The axial center is fixed to one inner surface of the pair of end caps. A threaded portion is threaded on the side of the end that is different from the end of the fixed shaft, and by inserting the shaft into the flow port of the other end cap, the threaded portion protrudes and is A proposal to seal a winding end of a filter medium or the like between end caps is disclosed. Such improved sealing can improve the leakage disclosed in [FIG. 23] of Patent Document 2, and allows fluid to pass from the outer peripheral surface side of the cylindrical cartridge filter to the inner surface side of the shaft center. It has been proposed that a large amount of foreign matter can be captured by the above-described method and contributes to the recycling described above.

JP-A-2014-173868 ([Claims], [0002], [0013], [0042] to [0047] and [FIG. 1], etc.)

JP 2001-104716 A ([Claims], [0057] and [FIG. 1] to [FIG. 3], [0099] to [0104] and [FIG. 23] to [FIG. 26]), and [0167] and [0171] etc.)

  In the above-described prior art, it can be understood that cartridge filters are widely used, and there are various uses for which recycling is desired. Against this background, the inventor according to the present application has examined the simplicity of disposal of the filter medium for achieving more efficient filtration and recycling with regard to the constituent components wound around the filter medium. That is, paying attention to the configuration in which the filter medium is wound around the support body described in Patent Document 2, the thickness of the wound filter medium or the volume itself occupied by the filter medium by winding is a so-called depth filter. Contributes to filtration or adsorption. Therefore, as illustrated in the same publication, the pleated filter material bent in a zigzag shape is easy to remove from the support, but the volume occupied by the filter medium is increased so that the volume of the cartridge filter can be efficiently increased. There was a problem that it was difficult to contribute to the filtration function. Furthermore, in the case of a filter medium that is bent in a pleat shape, after removing it from the support, it requires auxiliary means such as pressure compression to reduce the volume of the filter medium, making efficient recycling difficult. The problem remains. On the other hand, in order to efficiently use the filter medium wound around the outer periphery of the constituent component serving as a support, it is better to wind the filter medium around the support a plurality of times and to increase the diameter by winding. It is advantageous. However, when only the filter medium is removed from the component around which the filter medium is wound, the filter medium wound at a high density causes the tightening, and only the component used for the winding is recovered and used filtration is performed. There is a problem that it is difficult to reduce and discard the material.

  The present invention has been made to solve the above-described conventional problems, and is intended to substantially reduce the volume of a used filter medium when recovering the filter medium wound around the constituent components serving as a support. In addition, an object of the present invention is to realize a cartridge filter excellent in recyclability in which a filter medium can be easily removed.

  In order to achieve this object, according to the configuration of the cartridge filter of the present invention, the filter medium is wound around the outer periphery of the cylindrical porous core having openings at both ends, and the end cap is fitted into the opening. In the cartridge filter described above, the porous core is made of a flexible material, the porous core has slit portions extending at both ends thereof, and the end cap is inserted into the opening of the porous core. An insertion portion and a flange portion for restricting the insertion depth at both ends forming the opening of the porous core described above, and by removing the end cap inserted into the porous core described above, The width of the slit portion is reduced, and a gap is generated between the porous core and the wound filter medium.

  Moreover, according to the suitable aspect of this invention, it is suitable that a bias is provided in the outer peripheral surface where the insertion part of the end cap mentioned above contacts the above-mentioned porous core.

  Furthermore, according to another preferred aspect of the present invention, the above-described end cap is fitted into the above-described slit portion while being inserted into the above-described porous core, and the protrusion extends from the above-described flange portion. It is preferable to provide one piece.

  By applying the aspect of the present invention, a cartridge excellent in recyclability without substantially increasing the volume of the used filter medium when collecting the filter medium wound around the constituent components to be the support. A filter can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view partially showing a cartridge filter around which a filter medium is not wound in order to explain a preferred embodiment of the present invention. FIG. 2 is a perspective view partially showing the cartridge filter with the end cap removed, similar to FIG. 1. FIG. 4 is an explanatory view schematically showing a cross section of a cartridge filter when an end cap is inserted in order to explain the operation effect according to the preferred embodiment of the present invention. FIG. 4 is an explanatory view showing a schematic cross section of the cartridge filter with the end cap removed, similar to FIG. 3. It is explanatory drawing which shows the end cap by the suitable form of this invention perspectively.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, specific shapes, arrangement relationships, etc. will be described as examples. However, the present invention is not limited to these illustrated examples, and can be suitably designed within the scope of the object of the present invention. be able to. In addition, in order to facilitate understanding of the description, in this specification, the cartridge filter is collectively referred to regardless of the presence or absence of a wound filter medium.

FIG. 1 is a perspective view partially showing a perspective view in a state where end caps at both ends of a cartridge filter of a preferred embodiment are inserted into openings of a porous core, and showing boundary portions between components. In order to identify, the main part is hatched. Further, in the same figure, the thickness of materials of some constituent components is omitted.
In the configuration of the cartridge filter 11 of the present invention, the cylindrical porous core 13 has openings at both ends, and the end caps 15a and 15b are fitted and inserted into the openings. As will be described in detail later, the porous core 13 is made of a flexible material that flexes elastically, and the fluid to be filtered flows between the inside and the outside of the cylinder and is wound around the core. It has a mesh shape that can exert a filtering action by the illustrated filter medium. In addition, a slit portion 17 is formed on the outer peripheral surface of the porous core 13 with a width of d in the figure, extending over the openings at both ends. As such a flexible material, for example, synthetic resin such as nylon, polyolefin, polyester, etc., fiber reinforced plastic in which glass fiber or the like is blended with these synthetic resins, or rust-proof metal material such as stainless steel are used. The material can be appropriately selected from materials that are resistant to fluids.

  Further, the end caps 15a and 15b are respectively provided with insertion portions 19a and 19b having outer diameters substantially the same as the inner diameter of the porous core 13 so as to be fitted into the openings of the porous core. The flange portions 21a and 21b having the same outer diameter as the outer diameter of the porous core 13 are provided. Among the configurations of the end caps, positioning at the time of being inserted into the opening while being in contact with the inner peripheral surface of the porous core 13 at the distal end of the outer peripheral surface in the insertion direction of the insertion portion 19a and the insertion portion 19b is easy. However, in order to describe the details of the end cap including the bias in detail later with reference to another drawing, the illustration in FIG. 1 is omitted. In addition, there are provided projecting piece portions 23a and 23b which are formed integrally with the above-described flange portions 21a and 21b and which have a curved shape with a rounded shape at the fitting insertion tip. Although not shown in FIG. 1, a sheet-like material such as a nonwoven fabric, or a string or a belt-like material is directly wound around the outer peripheral surface of the porous core 13 of the cartridge filter and used as a filtering material. The

  Next, a state where the end cap is removed from the cartridge filter of FIG. 1 will be described with reference to FIG. In the configuration of the present invention, a filter medium is wound around the cartridge filter shown in FIG. 1, and after use for fluid filtration, the end cap is removed to reduce the width of the slit portion 17 to d ′ as shown in FIG. . In other words, since the porous core 13 is made of a flexible material, the opening area of the porous core 13 is reversibly reduced, or the apparent inner diameter of the core 13 is reduced and the width of the slit portion 17 is reduced. Is reduced, and the porous core 13 is deformed. As the component itself, at least the insertion portion 19a and the insertion portion 19b expand the inner peripheral surface of the porous core 13 by inserting the end caps 15a and 15b into the original width d ′ of the slit portion 17. In the preferred embodiment shown in FIG. 1, the protrusion 23 a and the protrusion 23 b described above are maintained in the width d by being fitted into the slit portion 17.

Next, the effect of the preferred embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic view showing a cross-section cut at a peripheral surface portion into which the protruding piece portion 23a constituting the end cap 15a is inserted in a state where the filter medium 25 is wound around the cartridge filter shown in FIG. As already described, the cartridge filter according to the present invention serves as an axis around which the filter medium 25 for performing fluid filtration is wound with the end cap 15a fitted into the porous core. Therefore, as illustrated in FIGS. 1 and 3, the filter medium is wound around the projecting piece 23 a and the porous core 13 in a state where the projecting piece 23 a is fitted in the slit portion 17. Further, the end cap 15a is provided with a protruding piece portion 23a extending from the flange portion 21a in order to fit into the slit portion 17 of the porous core 13 described above (the interface between both components). Is indicated by a broken line).
As described above, in the cartridge filter of the present invention, the wound filter medium 25 functions as a depth filter. Therefore, when the so-called “out-in” fluid filtration method is adopted, the fluid is guided into the filtration device and then permeated into the cartridge filter from the outer peripheral surface of the filter medium 25 and filtered through the porous core 13. Then, it reaches the hollow portion continuous with the opening of the cylindrical porous core described above. Thereafter, the filtered fluid is discharged out of the cartridge filter from an inlet / outlet (not shown) provided in the end cap, for example.

  Next, the state where the end cap is removed from the cartridge filter of FIG. 3 will be described with reference to FIG. As the filtration proceeds and the cartridge filter is replaced, the porous core 13 is shown by a broken line by removing the inserted end cap from the state in which the slit portion 17 has the width d when the cartridge filter is used. In contrast to the above, the width of the slit portion 17 is reduced to the width d ′ (d> d ′). By such reversible deformation, a gap S is generated between the inner peripheral surface of the filter medium that is in close contact when the filter medium is wound and the constituent components of the cartridge filter including the porous core, and the used filter medium is used. Only 25 can be easily recovered. During this time, the filter medium 25 is recovered in a high-density state without a volume change, and a substantial volume reduction can be achieved.

  Next, the structure of the end cap 15a shown in FIG. 1 etc. is demonstrated with reference to FIG. In FIG. 5, as an exemplary configuration of the end cap 15a, a bias 27 is disposed by chamfering the outer peripheral surface of the insertion portion 19a. When the bias 27 is inserted into and inserted into the inner side surface of the porous core 13 along the tip of the insertion portion 19a, the outer diameter of the insertion portion 19a is reduced at the portion of the bias 27, and the inner diameter of the porous core 13 is reduced. It is possible to improve workability when expanding.

  These end caps may be either a single material or a material that is different for each component, but since it has a function of expanding the slit portion, it is resistant to fluid and is the same material as the porous core. That is, it can be selected from synthetic resins such as nylon, polyolefin, polyester, and vinyl chloride, fiber reinforced plastics in which glass fibers are blended with these synthetic resins, or materials having rigidity such as metal materials such as stainless steel. In this way, similar to the porous core described above, the end cap is made of a material that takes into account the resistance to the fluid to be filtered, thereby allowing the porous core and the end cap to be reused. It is possible to efficiently reduce the volume of the material. Furthermore, as shown in FIG. 1, in the preferred embodiment, a fluid flow path 29 communicating with the opening of the porous core 13 is opened at the end face of the end cap 15 a on the flange portion 21 a side. The flow path 29 functions as an outlet for the purified fluid when the “out-in” filtration mode described above is employed. The flow path 29 serving as the discharge port may be disposed on both the end cap 15b explicitly shown in FIG. In addition, the shape and the like of the constituent components on the end cap side relating to such a flow path can be arbitrarily and suitably designed according to the mounting form on the filtration device.

  The arrangement shape of the protruding piece portion 23a illustrated in FIG. 5 is an extension dimension shorter than that of the insertion portion 19a, and the protruding piece portion has a rounded end. This is because when inserting into the porous core, the outer diameter and chamfering of the insertion portion of the constituent components of the end cap described above, or the tip shape of the protruding piece portion, the slit portion of the porous core. This is a preferred embodiment for improving workability when expanding the width. In the case of this example, since the arrangement dimension of the projecting piece portion 23a is made shorter than the arrangement dimension of the insertion portion 19a in the insertion direction, the tip shape of the projecting piece section 23a functions in an auxiliary manner. However, although not shown in the drawings, when the tip of the projecting piece is longer than the arrangement dimension of the insertion part, the tip shape of the projecting piece is rounded, and thus the main function of expanding the width of the slit part. On the contrary, the insertion portion 19a (particularly the bias 27) has an auxiliary expansion function.

  Furthermore, as described above with reference to FIG. 1 as a function of the protruding piece portion 23a, by making the outer diameter of the porous core substantially the same as the outer diameter of the protruding piece portion at the time of insertion, The surface on which the filter medium of the cartridge filter 11 is to be wound can be a continuous surface. Since this may lead to a fluid shortcut (leakage) when the slit portion 17 is exposed at the winding position of the filter medium 25, it is preferable to use the continuous surface described above (see FIGS. 1 and 3). In addition, in order to regulate the winding position of the filter medium, by taking the outer diameter of the region excluding the extending position of the protruding portion in the flange portion shown in FIG. 1 larger than the outer diameter of the porous core, Since the outer peripheral surface of the conductive core is surely covered with the filter material wound in multiple layers, a preferable form can be realized. Thus, the present invention is not limited to these examples, and it is apparent that any suitable design changes and modifications can be made within the scope of the object of the present invention.

  The cartridge filter according to the present invention can be applied to various fluid filtrations including radioactive substances, and the volume of the filter medium after use is substantially reduced, and the work of reusing each component other than this is high. It can be realized with sex.

11: Cartridge filter
13: porous core,
15a, 15b: end caps,
17: slit part,
19a, 19b: insertion part,
21a, 21b: flange part,
23a, 23b: projecting piece,
25: filter material (wound),
27: Bias,
29: flow path,
d: width of slit (when end cap is inserted),
d ′: width of the slit (when the end cap is removed),
S: A gap.

Claims (3)

In a cartridge filter provided with an end cap that is wound around the outer periphery of a cylindrical porous core having openings at both ends and fitted into the openings,
The porous core is made of a flexible material, and the porous core has slits extending over both ends, and the end cap is inserted into the opening of the porous core and the porous core Flange portions for restricting the insertion depth at both ends forming an opening, and removing the end cap inserted into the porous core reduces the width of the slit portion, and the porosity A cartridge filter, wherein a gap is formed between a core and a wound filter medium.   The cartridge filter according to claim 1, wherein a bias is provided on an outer peripheral surface where the insertion portion of the end cap is in contact with the porous core.   2. The projecting device according to claim 1, further comprising: a projecting piece portion that fits into the slit portion and extends from the flange portion in a state in which the end cap is fitted into the porous core. 3. The cartridge filter according to 2.

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