JPH11128616A - Cartridge filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cartridge filter capable of efficiently decomposing and removing a residual chlorine and also an org. matter simultaneously in addition to the removing of an iron rust and muddy component in a raw water. SOLUTION: A pleats type filter medium 7 is installed at an outer periphery of a water collecting core 6. A filter medium 10 is installed circularly around a neck part of the water collecting core 6. A three-layer filter structure is formed with the pleats type filter medium 7 and two kinds filter medium 8 and 10. At least either one of the filter mediums 8 and 10 is made of an activated carbon fiber or a granular activated carbon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge type filter for water treatment, and more particularly to pure water used in the food industry, the semiconductor industry, etc., in addition to those using tap water as raw water such as a soft drink vending machine. The present invention relates to a cartridge-type filter suitable for use in a production process of ultrapure water or ultrapure water.

[0002]

2. Description of the Related Art Conventionally, a filter in a cartridge type filter is often used as a single unit, and a cartridge is selected according to respective purposes such as removal of residual chlorine, removal of organic substances, removal of fine particles such as turbid components, and removal of bacteria. Used. For example, in the case of dechlorination and deorganization, use fiber carbon or granular activated carbon, and in the case of removing iron rust, turbid components and bacteria, select a filter sheet with a pore size corresponding to the size of the fine particles to be removed. And use it.

[0003] Of these, iron rust and turbid components are removed.
In many cases, a pleated filter capable of increasing a filtration area in a cartridge is used. That is, the pleated filter is disposed on the outer periphery of a cylindrical water collecting core having a large number of water holes formed in the peripheral wall, and directs a flat filter sheet in the radial direction of the water collecting core. Since it is folded into a pleated shape and formed into a cylindrical shape, it is possible to secure a large filtration area even within a relatively small diameter of the cartridge.

[0004]

As described above, a cartridge using a pleated filter is often used for removing iron rust and turbid components. However, in the conventional pleated cartridge filter, even if it is possible to remove not only iron rust and turbid components but also bacteria by selecting the pore size corresponding to the filtration target in the raw water, it can be dissolved in the raw water. However, it is not possible to remove residual chlorine and organic substances, and it is necessary to separately prepare a cartridge using a filtering material effective for dechlorination and deorganization. Therefore, there is a problem that the installation area of the cartridge is required twice and the number of the cartridges is increased, so that the inspection and the maintenance are troublesome.

Therefore, the present invention solves the above-mentioned disadvantages of the conventional cartridge type filter, arranges a filter material in a cylindrical shape around the outer periphery of a pleated filter, and is provided on the inlet side of raw water. A filter medium is also provided around the neck of the water collection core so as to form an annular shape, and at least one of the two types of filter medium is made of activated carbon fiber or granular activated carbon. It is an object of the present invention to provide a cartridge-type filter capable of efficiently removing residual chlorine and organic substances simultaneously and simultaneously with the removal of residual chlorine and organic substances in the same cartridge.

[0006]

The structure of the present invention for achieving the above object is described in detail below.
In a cartridge type filter comprising a cap having an inlet portion of raw water and an outlet portion of filtered water, and a filter body which is exchangeably attached to a lower surface of the cap, the filter body is an outer cylinder having an upper surface opened. Body, a cylindrical water collecting core having a large number of water holes formed in a peripheral wall positioned at a substantially central portion of the outer cylindrical body, and a filter sheet attached to an outer peripheral portion of the water collecting core in a pleated shape. A pleated filter body which is folded into a tubular shape, a tubular filter material attached to an outer peripheral portion of the pleated filter body, and a filter material attached to form a ring around the neck of the water collecting core. And a three-layer filter structure comprising the pleated filter body and two types of filter media.

According to a second aspect of the present invention, there is provided at least one of a tubular filter provided on the outer periphery of the pleated filter and a filter provided in an annular shape around the neck of the water collecting core. The cartridge-type filter according to claim 1, wherein one of the filters is a filter made of activated carbon fiber or granular activated carbon. It is needless to say that a mixture of the activated carbon fiber and granular activated carbon may be used as the filtering material.

In the cartridge type filter of the present invention, as described above, a filter is provided around the outer periphery of the pleated filter, and the filter is also provided around the neck of the water collecting core so as to form an annular shape. Since at least one of them is made of activated carbon fiber or granular activated carbon, residual chlorine and organic substances contained in raw water such as tap water are decomposed or adsorbed by a filter medium other than the pleated filter to remove these. The treated water passes through a pleated filter located at the center of the filter body to remove iron rust, turbid components, and bacteria, and the filtered water passes through the water collecting core and the outlet of the cap. It is taken out of the filter and sent to various uses.

As described above, according to the present invention, in addition to the pleated filter, two types of filter media are compactly arranged in one cartridge and have an integrated structure, so that the installation space is much larger than before. You will need less. In addition, since at least one of the two types of filter media is made of activated carbon fiber or granular activated carbon,
In addition to the removal of iron rust, turbid components and bacteria, dechlorination and deorganization can be performed in the same cartridge, so that there is an advantage that maintenance and inspection become easy.

[0010] In addition to the pleated filter, two types of filter media are provided in the same cartridge,
Rough removal of turbid components and iron rust in raw water can be performed by the two types of filter media, which can reduce clogging of the pleated filter and reduce the load applied to the pleated filter. You can also soften it. When the above-mentioned fibrous or granular activated carbon is used as the filtering material, it is preferable to use silver-impregnated activated carbon in which silver known as an antibacterial metal is impregnated on the activated carbon.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cartridge type filter according to the present invention. FIG. 1 is a longitudinal sectional view showing one embodiment of the cartridge type filter of the present invention, and FIG. 2 is a transverse sectional view taken along line BB of FIG.

In FIG. 1, reference numeral 1 denotes a cap having an inlet 2 for raw water and an outlet 3 for filtered water, and reference numeral 4 denotes a filter main body which is exchangeably attached to an opening on the lower surface of the cap 1.

The filter body 4 includes an outer cylindrical body 5 having an upper surface opened, a cylindrical water collecting core 6 positioned substantially at the center of the outer cylindrical body 5, and a water collecting core 6. A pleated filter 7 attached to the outer peripheral portion, a cylindrical filter material 8 attached to the outer peripheral portion of the pleated filter 7, and a filter attached to the neck 9 of the water collecting core 6 so as to form an annular shape. Material 10.

The outer cylinder 5 has a two-layer structure of an outer body made of aluminum and an inner body made of a synthetic resin such as ABS resin or PET resin in order to maintain sufficient pressure resistance. Since the inner body that comes into contact with the water to be treated is made of a synthetic resin, it is possible to avoid the possibility that aluminum is eluted into the water to be treated.

The cylindrical water collecting core 6 located substantially at the center of the outer cylindrical body 5 has a large number of water passage holes 11 formed in the peripheral wall thereof, and has a front end portion of a neck 9 formed at the upper part. Is connected to an outlet 3 of the filtered water provided in the cap 1. As shown in FIG. 1, a support plate 12 for supporting a filter medium 10 is formed on the neck portion 9, but the support plate 12 is not formed in a disk shape. A through-hole is formed so that the water to be treated that has passed through can flow down. Note that the support plate 12 does not protrude from the neck 9 of the water collecting core 6,
You may make it protrude from the synthetic resin inner body of this.

The pleated filter 7 is formed by folding a long rectangular filter sheet radially into a pleated shape to form a tube. The filter sheet is made of polypropylene, polyester, or the like.
Pore size of acetyl cellulose, polysulfone, etc.
A synthetic resin film of about 2 to 0.45 μm is used as a membrane,
It is best to use a three-layer structure in which the inner and outer layer materials with good water permeability are laid on both sides, but it also has the strength to withstand the load during water flow. If it does, a filter sheet made of only the membrane may be used.

The cylindrical filter material 8 attached to the outer periphery of the pleated filter 7 is preferably made of activated carbon fiber or granular activated carbon, or a mixture of these activated carbons. When 10 is made of activated carbon fiber or granular activated carbon, the pore size is 10 to 20.
A filtering material made of polyester or polypropylene of about μm may be used.

The filter material 10 attached to the neck 9 of the water collecting core 6 in an annular shape is made of activated carbon fiber or granular activated carbon, as in the case of the filter material 8, or a mixture of these activated carbons. The filter may be used, or a polyester or polypropylene filter having a pore size of about 50 to 100 μm may be used.

The above-mentioned filter media 8 and 10 made of activated carbon fiber or granular activated carbon can be produced, for example, by the following method. That is, the raw material activated carbon fiber or granular activated carbon, or a mixture thereof, is mixed with an appropriate amount of synthetic fiber serving as a binder, and then formed into a sheet having a required thickness in the same manner as when a nonwoven fabric is manufactured. The product can be obtained as it is or after being formed into a cylindrical shape, and then put into a furnace to melt the binder portion and stabilize the shape.

The two types of filter media 8 and 10 may be made of activated carbon fiber or granular activated carbon, or may be a mixture of these activated carbons. In the case of using silver, silver-impregnated activated carbon obtained by impregnating the activated carbon with silver known as an antibacterial metal can also be used.

In addition, in the figure, 13 is a check valve attached to the raw water inlet 2 of the cap 1, 14 is a passage of water to be formed formed between the outer cylinder 5 and the filter medium 8, and 15 is a filter. A VO ring for attaching the main body 4 to the cap 1 in a watertight manner.

The cartridge type filter of the present invention has the above-described structure, and a filter medium 10 serving as a primary filter is disposed on the raw water inlet side, and the filter medium 10 is made of activated carbon fiber or granular activated carbon. Alternatively, by mixing these activated carbons, residual chlorine and organic substances dissolved in raw water can be quickly decomposed or adsorbed. In addition, the filter medium 10 has a pore size of 50 to 10
When using a filter material made of polyester or polypropylene of about 0 μm, even if dechlorination and deorganization are impossible, it is necessary to roughly remove turbid components with relatively large particle sizes contained in raw water. Can be.

The water to be treated, which has passed through the filter material 10 serving as the primary filter, flows down the passage 14 and is dechlorinated and removed by the filter material 8 serving as a secondary filter attached to the outer periphery of the pleated filter 7. Organic substances, iron rust, turbid components and bacteria are removed. That is, when the filter material 8 serving as the secondary filter is made of activated carbon fiber or granular activated carbon, or a mixture of these activated carbons,
When the residual chlorine and organic substances in the water to be treated are decomposed or adsorbed, and the filter medium 8 is made of a polyester or polypropylene filter medium having a pore size of about 10 to 20 μm, the secondary filter is used for 10 to 20 μm.
Iron rust having a particle size of m or more, turbid components and bacteria are removed.

The water to be treated, which has passed through the filter material 8 serving as the secondary filter, is filtered by the pleated filter 7 located inside the water, to remove extremely fine turbid components and the like which are not removed by the primary filter or the secondary filter. The bacteria are removed, and the filtered water enters the core through a water hole 11 formed in the core 6 for collecting water, and the cap 1 is inserted through the neck 9.
From the filtered water outlet 3 to each destination.

[0025]

According to the cartridge type filter of the present invention,
Residual chlorine and various organic substances and fine particles such as iron rust and turbid components contained in raw water such as tap water are extremely efficient by a three-stage filter configuration that is compactly arranged in the same filter body. Decomposed or removed. Therefore,
There is no need to prepare a plurality of cartridges for different purposes, and the installation space is much smaller than in the past, so that the present invention has a great effect when used in a soft drink vending machine or the like. In addition, by providing two types of filter media in the same cartridge in addition to the pleated filter, rough removal of turbid components and iron rust in raw water can be performed by the two types of filter media. And the clogging of the pleated filter can be alleviated, and the load applied to the pleated filter can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a cartridge type filter of the present invention.

FIG. 2 is a transverse sectional view taken along line BB of FIG.

[Explanation of symbols]

 1: Cap 2: Inlet 3: Outlet 4: Filter body 5: Outer cylinder 6: Water collecting core 7: Pleated filter 8: Filter material 9: Neck 10: Filter material 11: Water hole 12 : Support plate 13: Check valve 14: Passageway

Claims (2)

[Claims] 1. A cartridge type filter comprising: a cap having an inlet portion of raw water and an outlet portion of filtered water; and a filter body which is exchangeably attached to a lower surface of the cap. An outer cylindrical body having an opening, a cylindrical water collecting core having a number of water holes formed in a peripheral wall positioned substantially at the center of the outer cylindrical body, and a filtration provided on an outer peripheral portion of the water collecting core; A pleated filter formed by folding the sheet into a pleated shape to form a tube, a cylindrical filter material attached to the outer periphery of the pleated filter, and an annular shape around the neck of the water collecting core. A cartridge type filter comprising: a filter material to be attached; and a three-layer filter structure formed by the pleated filter body and two types of filter materials. 2. A method according to claim 1, wherein at least one of the cylindrical filter material provided on the outer peripheral portion of the pleated filter and the filter material provided in an annular shape around the neck of the water collecting core is made of activated carbon fiber or granular. The cartridge-type filter according to claim 1, wherein the filter is a filter made of activated carbon.