JPS6380815A - Filter cartridge - Google Patents

Abstract

PURPOSE:To obtain an inexpensive cartridge provided with a filter membrane, having a large effective area and excellent reliability in its liquid-tightness, and equipped with a support having a simple structure and excellent in moldability and processability, by making the support of the cartridge integrally moldable. CONSTITUTION:A plurality of inner peripheral rims 3 having two filter membranes 2 adhered thereto are engaged with the outer periphery of a core 4 having a communication hole 5 provided to the center thereof, and the central opening parts 14 being the filtrate take-out ports communicating with the core 4 are formed above and below the laminated inner peripheral rims 3, and an upper protective plate 7 and a lower protective plate 8 for protecting the filter membranes 2 and forming secondary side flow passages are provided to the uppermost and lowermost parts of a filter membrane structure 1. Further, the filter membranes 2 are adhered to the ring-shaped outer peripheral rims 6, which are connected to the inner peripheral rims 3 by a plurality of channels 15, over the entire regions of the outer peripheral edge parts 12 thereof, and the inner peripheral edge part 11 of the filter membranes 2 are respectively fixed to the upper and lower parts of each inner peripheral rim 3.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a filter cartridge for filtration incorporating a microporous filtration membrane, and is particularly suitable for filtration of filtration agents and drug manufacturing in the ILC soba industry. Purified water for the production of cleaning water used for filtration of purified water, or purified water for the production of ultrapure water used in the electronics industry that performs fine processing, including the semiconductor manufacturing industry. It is used for filtration in the alcoholic beverage production process in the food industry, purified water for producing ultrapure water in laboratories, filtration of pure water, and other precision filtration.
The present invention relates to the structure of a filter cartridge for precision filtration that filters microparticles and microorganisms on the submicron order of less than m.

[Conventional technology]

A filter cartridge incorporating a microporous filtration membrane is a cylindrical filtration membrane in which the microporous filtration membrane is pleated and folded, and the height is parallel to the pleats. forming a structure, and protecting the inside and outside of the cylindrical filtration structure with a plastic member;
Pleated type filter cartridges have been widely used in the past, having a cylindrical end sealed with another plastic member adhered to the end.

This pleated type filter cartridge can increase the built-in area of the filtration membrane per volume (1 yen effective filtration area), so the filtration flow per unit time h! r is large, and it is large in the aforementioned industrial field and laboratory! It is heavily used as a filtration filter.

This filter is used by attaching it to a special nozzle, but in recent years, it has been used for filtration lines that filter a variety of liquids in a short period of time and that require frequent filter replacement. As a filtration means,
Disposable filter cartridges (also called capsule-type filter cartridges), which have an effective filtration area of about 0.05 to 0.4 mm and are integrated with a filtration membrane structure and a nozzle, have come into use. Similarly, a so-called mini-filter cartridge for filtration, which has a small effective filtration area and is added to the metal housing, is also used. The mini-filter cartridge has a filtration membrane structure and a filtration part similar to that of the above-mentioned disposable filter cartridge, and has a filtration membrane structure having a sealing part to prevent the housing.

Disposable filter cartridges and mini filter cartridges are standard pleated type and JP-A-56-
It is divided into a flat plate laminated type filter cartridge in which flat plate type filtration units are laminated as disclosed in Publication No. 12901.6.

The structure and manufacturing method of the pleated type of disposable filter cartridges and mini filter cartridges are essentially the same as the pleated type filter cartridges used by attaching them to the housing described above. After forming the membrane structure, the step of inserting the dough into a plastic nozzle is added.

The structure and manufacturing method of a disposable filter cartridge and a flat plate laminated filter cartridge such as a mini filter cartridge are basically as follows, as described in Japanese Patent Application Laid-Open No. 129016/1983.

2. The outer periphery and center are punched out in a circular or polygonal shape.
A sheet of filtration membrane (if it is circular, it will be donut-shaped) is attached to a flat support with parallel surfaces (in some cases, there is also a support that is made by bonding two molded members together) and the outer peripheral edge , and is attached to the inner peripheral edge or at a predetermined location as necessary. In particular, the outer peripheral edge and the inner peripheral edge must be sealed liquid-tightly by adhesive.

The flat support is usually designed to have an internal space formed by bonding two filtration membranes face-to-face and to form a flow path for the filtered liquid. That is, the flat support holds the two filtration membranes from the inside as described above, and the inner periphery of the support is such that the filtered liquid can flow as desired to the center of the flat filtration unit. It has a diaphyseal structure with a central opening in the rim for ventral drainage.

Further, a filtration membrane structure can be formed by bonding and stacking a plurality of flat plate filtration units.

An upper protection plate for protecting the filtration membrane is connected to the filtration membrane of the flat plate unit at the top of the laminate at a constant distance. Also, for the same purpose at the bottom, in the case of a mini filter cartridge, a lower protection plate is provided in addition to the purpose of ensuring that the 71 Uzing is set. The laminated filtration membrane structure formed in this way is glued to the housing in the case of manufacturing disposable filter cartridges, and is used in the I+! of mini filter cartridges. ! In the case of a housing, a seal part having a groove of sealing material such as an O-ring was joined to the housing.

What is desired for these disposable filter cartridges and mini filter cartridges is, for example, increasing the filtration area per constant volume (i.e., providing a compact filtration module, filtration with a small filtration pressure, and filtration accuracy. To make it easier to attach and detach the cartridge filter to the filtration line, and to prevent damage to the microporous membrane due to abrasion and impact during handling.

You can also include information such as the low amount of remaining liquid.

[Problems to be solved by the present invention]

However, in conventional flat plate filtration units,
For example, the structure disclosed in Japanese Unexamined Patent Publication No. 56-129016 has an opening 23 at the center of the inner periphery as shown in FIG. As a result, the secondary flow path 22 has a force q.

Because the filtration unit consists of two members pasted together like this,
Manufacturing and assembling a support having a complicated shape required a large amount of cost.

[Purpose of the invention]

The present invention has been made to solve the above problems,
To provide an inexpensive filter cartridge with a large effective area of the filtration membrane, excellent reliability in liquid-tightness of the filtration membrane, simple structure, and a support with excellent moldability and processability. The purpose is to

[Structure of the invention]

The above object of the present invention is to provide a flat filter cartridge formed by stacking a plurality of filtration units, each of which has a plurality of inlets around an outer rim and a filtrate outlet at an inner rim. The filter is constituted by a support body in which an outer circumferential rim and an inner circumferential rim are connected by a plurality of spoke-like channels, and a filtration membrane is firmly sealed to the inner circumferential rim and the outer circumferential rim of the support body to form a filtration unit. This is achieved by a filter cartridge characterized in that the IJ support can be integrally molded.

Embodiments of the present invention illustrated in the drawings will be described below.

FIG. 1 is a sectional view of a main part explaining an embodiment of the present invention, and is a partial sectional view of a filtration membrane structure l in a flat plate laminated type filter cartridge. FIG. 2 is an enlarged cross-sectional view of the right half of the filtration unit shown in FIG. 4 taken along the line AA in FIG. Figure 3 is the same as Figure 2 (, 8-8 sectional view in Figure 4,
FIG. Φ is a perspective view of the structure of FIG. 2 with the filter membrane removed.

As shown in FIG. 1, the filtration membrane structure 1 has a structure in which a plurality of flat plate filtration units, each of which is the minimum unit, is stacked, each of which is composed of two upper and lower filtration membranes 2, each having a disk shape, for example. That is, a core Φ having a communication hole 5 is provided in the center, and a plurality of inner circumferential rims 3 to which two filter membranes 2 are attached are fitted around the outer periphery of the core. A central opening 14 is formed at the top and bottom of the circumferential rim 3 as a filtrate outlet leading to the core, and a central opening 14 is formed at the top and bottom of the filtration membrane structure 1 to protect the filtration membrane 2 and provide a secondary side. An upper protection plate 7 and a lower protection plate 8 are provided to form a flow path.

Furthermore, as shown in FIGS. 2 and 84, the entire outer peripheral edge 12 of the filtration membrane 2 is attached to a ring-shaped outer rim 6 connected to the inner rim 3 through a plurality of channels. Two inner circumferential edge portions 11 are fixed to the top and bottom of the inner circumferential rim 3, respectively.

Further, this outer rim 0 is provided with connection parts 17 and 18 that are uneven in the thickness direction of the filtration units, and when a plurality of filtration units are stacked, the connection parts 17 and 18 are fitted together. A secondary flow path is formed by attaching upper and lower protection plates 7 and 8 to the upper and lower sides of the stacked filtration units. Further, a plurality of intake ports 13 are provided at the center around the outer rim.

By configuring the outer circumferential rim and the inner circumferential rim in this manner, it is possible to form a filtration unit like a conventional flat plate type filtration unit (or a structure in which two upper and lower members are bonded together).

Attaching at the inner peripheral edge 11 and outer peripheral edge 12
(Width in the radial direction) is not particularly limited, but it is preferable to have a certain width in consideration of liquid tightness and reduction of effective area due to adhesion. .1 to 5 chickens is suitable.

FIG. 3 is a view from B-8@ in FIG. 4. The outer circumferential rim 6 is connected to the inner circumferential rim by a plurality of channels 15, and ribs 16 for reinforcing the filtration membrane are added as necessary. The filtration units and the upper and lower protection plates have a structure in which a synthetic resin material or a non-woven fabric 19 is sandwiched in order to prevent the upper and lower adjacent filtration membranes from coming into close contact with each other and to maintain the strength of the filtration membranes.

The above-mentioned inner and outer circumferential rims 3, 6 and hand yarn 1 in the present invention
The materials of the flat plate-like support body with 5°, the upper and lower protective plates 7°8, the core Φ, etc. are not particularly limited, but from the viewpoint of tJU workability, plastic resin is suitable, and among them, inert and In addition, examples of resins that appropriately provide rigidity include polyester, polycarbonate, Tt? Risulfone, polyvinylidene fluoride, polyoxymethylene resin, polyamide.

Phenyl formaldehyde resin, polytetrafluoroethylene, or tetrafluoroethylene, perfluoroalkyl vinyl ether copolymer fluororesin, polychlorotrifluoroethylene, and the like can be appropriately selected and used.

Further, the filter membrane 2 may be attached alone, but in order to increase its strength, it is also possible to attach a net-like body made of synthetic resin to the inside.

In the present invention, the method of forming an adhesive on the filtration membrane 2 and adhering the filtration membrane and the filtration unit includes a method using a solvent type adhesive and a method using a thermal crosslinking type adhesive.

Alternatively, it can be easily adhered by applying a heat sealing method or the like. Reliable liquid tightness can be guaranteed, and it goes without saying that the lower side of the core has a structure that is connected to a housing (not shown) while maintaining liquid tightness, as in the conventional case.

The path of the filtrate in the IJ joint is as shown by the arrow in FIG. 2. In other words, the filtrate flows into the housing (not shown). The liquid salt enters from the plurality of liquid salt inlets 13 provided at the center around the outer rim 60 of the filtration unit, and enters the inside (primary side) of the upper and lower filtration membranes 2, that is, the channel 1.
Impurities such as fine particles and microorganisms are filtered out by penetrating into the filtration membrane 2 by appropriate hydraulic pressure from the side where 5 is located, and then entering the outside (secondary side) of the filtration membrane 2 [infiltrating into the inner periphery]. It passes through a plurality of central openings 14 leading to the communication holes 5 of the core Φ formed on the upper and lower sides of the rim 3, passes through the hollow part of the core, and is discharged from the filter cartridge to achieve the desired filtration. There is no problem in using it in reverse.

In this way, the portion of the filtration membrane 2 that is used for the filtration action is the entire area excluding the bonded portion between the inner periphery 11 and the outer periphery 12 fixed to the inner rim 3 and the outer rim 6 and the filtration membrane.

Moreover, it is also possible to have a configuration that does not use core components.

〔Effect of the invention〕

The present invention provides a flat filter cartridge formed by stacking a plurality of filtration units, in which the filtration unit has a plurality of liquid salt inlets at the center around an outer rim, and the outer rim is connected to an inner rim and a plurality of channels. A filter using an integrally moldable support body which is connected to each other and has filtration membranes attached to the top and bottom of the inner and outer rims, respectively, and has a central opening communicating with a communicating hole in the core at the top and bottom of the inner rim. With the cartridge, the structure of the support with the filtration membrane pasted can be molded in one piece compared to the conventional two-layer pasted type support, which simplifies mold production, reduces processing man-hours, and reduces production costs. It became possible to do so.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a filter cartridge illustrating an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the right half of the filtration unit shown in Fig. 1, taken along the line A-A in Fig. Second
Same as the figure (, BB cross-sectional view of Figure 4, Figure 4 is a perspective view of the structure shown in Figure 2 excluding the filtration membrane, Figure 5 is a schematic cross-sectional view of a conventional flat plate type laminated cartridge. 1... Filtration membrane structure, 2... Filtration membrane, 3... Inner rim, 4... Core, 5... Communication hole, 6... Outer rim, 7... Upper protection plate, 8...lower protection plate, 1]・
...Inner peripheral edge, 12...Outer peripheral edge, 13...Liquid salt inlet,]4...Central opening, 15...Channel, 1
6... Rib, 17... Connecting part (convex), 18...
Connecting portion (concave), 19... Net-like body or nonwoven fabric, 2o.
...Upper support, 21...Lower support, 22...2
Next side flow path, 23...Opening part Fig. 1 Fig. 2 Fig. 4 Fig. 5

Claims (1)

[Claims] In a flat filter cartridge formed by stacking a plurality of filtration units, the filtration unit has a plurality of liquid inlets on the outer rim, a filtrate outlet on the inner rim, and a filtration unit that has a plurality of liquid inlets on the outer rim and a filtrate outlet on the inner rim. The support body of the filter cartridge that forms the filtration unit is integrally formed by firmly sealing the filtration membrane to the inner and outer rims of the support body. A filter cartridge characterized by being moldable.