JPH0642929B2 - Cartridge filter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cartridge type filter in which a large number of filter discs forming a bellows type filtration surface are stacked in series, and in particular, the periphery of a discoidal filtration surface is integrally connected. The present invention relates to a technology for forming a bellows type.

[Prior Art] As a device for filtering foods, pharmaceuticals, or general industrial liquids, as shown in FIG. 5, filtration materials obtained by impregnating cellulosic fibers with diatomaceous earth are formed into bellows-type filter discs 50. At the same time, a large number of filter discs 50, 50 ...
Conventionally, a cartridge type filter has been used in which a bellows type filter is configured by connecting the above in series and the liquid is filtered inside and outside the bellows body.

Generally, in this type of cartridge type filter, when connecting the filter boards 50 in series, a mesh-like partition plate 51 made of a hard synthetic resin material is provided in each filter cartridge 50, and the filter plate 50 is placed at a position facing the through hole. A fin core 53 of each filter disc 50 and a cylindrical core portion 5 in which the connecting rings 52 are connected in series by a ring-shaped connecting ring 52.
Since the filter layers are in communication with each other and the filter layer is thick and can be captured stepwise from large to small, it can be used not only in various fields but also as a compact device.

However, in this type of cartridge type filter, since the filter material is obtained by impregnating cellulose fibers with diatomaceous earth, not only the filter cartridge 50 becomes soft when used but also the shoulder portion of the bellows droops. The filter surfaces of the filter plates 50, 50 that are
Since there is a problem that the substantial filtration area is reduced and the filtration performance recedes in a short time, the peripheral edge 55 of the partition plate 51 is interposed between the peripheral edges 56, 56 of the upper and lower filter discs 50, 50, and C An annular grip member 57 having a mold cross section is put on the peripheral edges 56, 56 and crushed from both sides thereof to be compressed and sandwiched to surround the filter disks 50, 50 and the peripheral edges 55, 56 of the partition plate 51.
An integrated structure is used.

[Problems to be Solved by the Invention] However, in the structure of the peripheral portion of the conventional filter cartridge described above, the hard grip member 57 is cut into the peripheral portion of the filter disc 50, and the cutting proceeds from the outside early in use. Had a problem of breakage.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cartridge-type filter having a durable filter cartridge and capable of maintaining initial filtration performance for a long period of time. .

[Means for Solving the Problems] That is, in the cartridge filter according to the present invention, a through hole is formed in each central portion of the upper filter plate and the lower filter plate, which are appropriately molded with a filtering material, to form a filter of both filter plates. A cartridge filter which is used by being laminated in series so as to seal the outer periphery and to connect the through holes adjacent to each other, and is made of a hard synthetic resin laminated for the purpose of preventing mutual adhesion of the filter discs between the upper and lower filter discs. The partition plate is arranged such that the melting peripheral edge formed on the outer periphery of the partition plate is sandwiched between the peripheral edges of the upper and lower filter plates, and a filter including an outer edge portion of the partition plate protruding in the outer diameter direction from the peripheral edge of the filter. The gist of the present invention is that the outer edge of the board is insert-molded or heat-pressed to form a seal edge integrated with the partition plate.

Further, the gist of the present invention is to form a protective film of the filter material by attaching a screen sheet made of a non-woven fabric such as polyester resin to the surface of the filter material of at least one of the upper filter plate and the lower filter plate. .

[Operation] Therefore, since the partition plate located in each fin chamber carries the peripheral edge by the sealing edge that is integrated with the upper and lower filter discs, it is a filtration material in which cellulose fiber is impregnated with diatomaceous earth, and at the time of use, it is a filter cartridge. There is no concern that the shoulder portion of the bellows will drip even when the sheet is wet and weakened, and the filtration surfaces of adjacent filter cartridges will not come into close contact with each other, thus causing no problem such that the substantial filtration area is reduced.

Moreover, since the reinforcing structure in which the synthetic resin is impregnated is formed on the outer peripheral portion of the filter disc by the constitution of the seal edge integrated with the partition plate, the initial filtration performance can be maintained for a long period without the damage of the portion. .

Furthermore, since a screen sheet made of a non-woven fabric such as polyester resin is adhered to the surface of the filter material, the screen sheet acts as a protective film against sudden fluctuations in hydraulic pressure during use of the filter, which may cause damage. In addition to reducing the load, it also protects the board from damage when cleaning the filter cartridge.

[Examples] Examples of the cartridge filter according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a cartridge filter 1 constructed according to the present invention and a filter in which the cartridge filter 1 is assembled in a bellows type. Reference numeral 1 is a disc shape having a through hole 4 in the center thereof. The filter cartridge is composed of a lower filter board 2 and an upper filter board 3. Lower filter board 2 and upper filter board 3
Is formed by a slurry of cellulose fibers impregnated with a filtering material such as diatomaceous earth. The outer surface of the upper filter board 2 is covered with a screen sheet 5 made of a non-woven fabric such as polyester resin having a higher permeability (larger filtering holes) than the filter boards 2 and 3, and the screen sheet 5 is an upper filter. It extends to the outer circumference of the board 3. Further, the filter cartridge 1 has a partition plate 6 made of a hard synthetic resin interposed between the filter plates 2 and 3, and the partition plate 6 has a large number of radial ribs 7, 7 ...
, And a plurality of circumferential connecting rings 8, 8 which are thinner than the radiating rib 7 and are connected to each other, form a mesh shape, and are attached to the fin chamber 9 of the filter cartridge 1 and the through hole 4 respectively. A cylindrical core portion 11 constituted by the connecting ring 10
Via the connecting ring 10. The outermost peripheral portion of the partition plate 6 constitutes a melting peripheral edge 13 which has a circumferential rib shape extending in the circumferential direction and having a diameter larger than the outer diameter of the peripheral edge 12 formed on the outer peripheries of the upper and lower filter discs 2, 3. It becomes. The melting edge 13 is the edge 1 between the upper and lower filter plates 2 and 3.
When sandwiched between the two, and when the sealing edge 14 is made of a synthetic resin of the same quality as the partition plate 6 on the outer peripheral portion of the filter cartridge 1 by the sealing edge forming method described later, from the peripheral edge 12 of the filter disks 2, 3 to the outer peripheral portion. The portion (see the broken line portion A) that protrudes to is formed by melting or deforming, and is airtightly integrated over the entire circumference.

As shown in FIG. 2, a large number of filter cartridges 1 each having the above-described structure are provided with a perforated tube shaft 1 which is inserted through the shaft core of a base 15 so as to project therefrom.
6, the connecting rings 10 are sequentially inserted and laminated in series, and the connecting rings 10, 10 ... And the inner circumference of the partition plate 6 are pressed against each other by a fastening screw 17 screwed onto the upper end of the perforated tube shaft 16. To form a bellows-shaped filter. The filter body is airtightly covered by a bell-shaped clamp 18, and a water supply port 19 communicating with the outside of the filter body on the pedestal 15 and the porous tube shaft 1 are provided.
6 is provided with a drainage port 20 extending from 6 to increase or decrease the number of layers of the filter cartridge 1 and the size of the clamp 18 is changed accordingly, whereby the filtering ability of the filtering device is increased. Can be adjusted.

Hereinafter, a specific embodiment of the method for forming the seal edge of the cartridge filter 1 will be described with reference to the drawings.

FIGS. 3 (a), (b) and (c) show a first embodiment in which the seal edge 14 is integrated by insert molding when it is molded by another synthetic resin material to be added. In the case of this embodiment, the shape of the seal edge 14 is preferably thin so that the diameter is slightly larger than the outer diameter of the peripheral edge 12 formed on the outer peripheries of the upper and lower filter disks 2, 3.

(A) First, the melting edge 13 of the partition plate 6 is sandwiched between the seal edge molding dies 30 and 31 while being sandwiched between the both edges 12 of the upper and lower filter plates 2 and 3.

(B) The inner cavity 32 of the seal edge molding dies 30 and 31 is filled with the synthetic resin 14a in which the same molding material as the partition plate 6 is dissolved. (The "dissolved synthetic resin 14a" refers to either one that is melted by heat or one that is melted by a solvent.) (C) Lumens of the seal edge molding dies 30, 31 After the molten synthetic resin 14a filled in 32 is solidified, both seal edge forming dies 30 and 31 are dissociated to obtain the seal edge 14.
At this time, in the seal edge 14, the portion of the melting edge 13 protruding from the edge 12 of the filter discs 2, 3 to the outer peripheral portion is melted at the surface and integrated with the seal edge 14, and the seal edge 14 is also integrated. The resin that makes up the filter board 2,
3 penetrates into the peripheral thickness 12 of the screen sheet 3 and the peripheral wall thickness of the screen sheet 5 to form a reinforcing structure.

FIGS. 4 (a), (b) and (c) show a second embodiment in which the sealing edge 14 is formed by thermocompressing the melting edge 13 formed on the partition plate 6. In the case of this embodiment, the shape of the seal edge 14 is preferably sufficiently larger than the outer diameter of the peripheral edge 12 formed on the outer peripheries of the upper and lower filter disks 2 and 3, and the protruding portion is preferably thick.

(A) First, the melting peripheral edge 13 of the partition plate 6 is grasped in a state of being sandwiched between the both peripheral edges 12, 12 of the upper and lower filter plates 2, 3.

(B) Next, the heated seal edge molding dies 30 and 31 are closed from both sides of the melting edge 13 so as to sandwich both edges 12 of the upper and lower filter plates 2 and 3, and the melting edge 13 is heated. It is melted and pressed at the same time.

(C) After radiating heat from the seal edge molding dies 30 and 31, the seal edge molding dies 30 and 31 are disengaged to obtain the seal edge 14. At this time, the sealing edge 14 is formed by the filter discs 2, 3
The resin, which is located on both sides of the peripheral edge 12 and constitutes the sealing edge 14, penetrates into the peripheral edges 12 of the filter discs 2 and 3 and the peripheral wall thickness of the screen sheet 5 to form a reinforcing structure.

[Effects of the Invention] As described above, in the cartridge filter according to the present invention, since the partition plates located in each fin chamber carry the peripheral edge by the sheet edges that are integrated with the upper and lower filter plates, It is a filter material impregnated with diatomaceous earth, and even if the filter cartridge gets wet and weakened during use, there is no concern that the shoulder part of the bellows will sag. Therefore, the filter surfaces of adjacent filter cartridges will adhere to each other, resulting in substantial filtration. Not only does it not cause such a problem that the area is reduced, but because the structure of the sealing edge forms a reinforcing structure in which the synthetic resin is impregnated on the outer peripheral portion of the filter disc, the initial filtration performance is improved over a long period of time. It has a characteristic that can be maintained, and the effect after the present invention is carried out is extremely large.

[Brief description of drawings]

FIG. 1 is a half-cut front view showing an embodiment of a cartridge type filter according to the present invention, and FIG. 2 is a partially cutaway front view showing a filtering device using the cartridge type filter, FIGS. (A), (b) and (c) of the figure are explanatory views showing an embodiment of a method of manufacturing the peripheral edge of the above-mentioned filter cartridge, and FIG. 5 is a cross-sectional view of a main part of a conventional filter. 1 ... Filter cartridge, 2 ... Lower filter plate, 3 ... Upper filter plate, 5 ... Screen sheet, 6 ... Separator plate, 13 ... Melting edge, 14 ... Sealing edge, 15 ... Stand Board, 16 ... Perforated tube shaft, 30, 31 ... Seal edge molding die.

Claims (3)

[Claims] 1. A perforation hole is formed in each central portion of an upper filter disc and a lower filter disc, which are appropriately molded with a filtering material, to seal the outer peripheries of both filter discs and to connect the adjacent perforation holes. In a cartridge filter to be used by being laminated in series with each other, a partition plate made of a hard synthetic resin laminated between the upper and lower filter plates for the purpose of preventing mutual adhesion of the filter plates, and a peripheral edge for dissolution formed on the outer periphery of the partition plate. Are arranged so as to be sandwiched between the peripheral edges of the upper and lower filter discs, and the outer edge portion of the filter disc including the outer edge portion of the partition plate protruding from the peripheral edge of the filter in the outer diameter direction is insert-molded or heat-pressed to form a partition. A cartridge type filter characterized by having a seal edge integrated with a plate. 2. The cartridge type according to claim 1, wherein the partition plate comprises a mesh-like body with a large number of radial ribs and a plurality of connecting rings that circumferentially connect the radial ribs. filter. 3. The cartridge type according to claim 1, wherein a screen sheet made of a non-woven fabric such as polyester resin is adhered on the surface of at least one of the upper filter plate and the lower filter plate. filter.