JPH081157A - Water purifier - Google Patents

Abstract

PURPOSE:To keep a filter medium in a sanitary state even when a device is used in a poor environmental condition with a lot of dust, bacteria, etc., by introducing clean air which was filtered with an outside air filtration film installed in a purified water collection chamber when outside air is introduced for draining a cartridge. CONSTITUTION:Raw water is supplied into a main body container 3 from a water supply hose 21 through a water supply port unit 22, etc. The water, after passing between a cartridge 1 and a cylindrical part 5, flows into a cartridge chamber 26 from a cartridge water passage part 24 and then passes through 4 nonwoven fabric to remove coarse refuse and iron rust. The chlorinated lime-odor and mold odor of water is eliminated by passing the water through an adsorbent layer 2b, and the passage of fine substances and bacteria is rejected by a hollow fiber membrane layer. The purified water, after being collected in a purified water collection chamber 25, is discharged from a purified water outlet 29 through a purified water pipe 28. A support outer cylinder 41 for protecting an outside air filtration film 40 is installed in the purified water collection chamber 25, and the film 40 is fixed by a fixing member 43 in the cylinder 41.

Description

Detailed Description of the Invention

[0001]

The present invention relates to organic matter, red rust, coarse dust,
The present invention relates to a water purifier that filters raw water containing bacteria, scent of odor, and musty odor, and relates to a water purifier that includes a filter body that filters raw water and a cartridge that houses the filter body.

[0002]

2. Description of the Related Art In recent years, due to corrosion and water pollution of underground pipes and the like, there is a possibility that water containing a small amount of red rust, organic matter, and germs may be sent to ordinary households. For this reason, in order to obtain sanitary water in each household, the number of households having a water purifier attached to the water supply is increasing. An explanatory view of an example of such a conventional domestic water purifier is shown in FIG.

The cartridge 1 is fixed to the cartridge mounting portion 17 provided on the lid portion 4 with a screw, and the purified water collecting chamber 2
5 is formed liquid-tight. The supplied raw water is supplied to the water supply hose 21 by switching a switching valve (not shown) attached to the faucet. Raw water enters the water supply unit 22 from the water supply hose 21 and is supplied into the main body container 3. At this time, a check valve 23 is provided in the supply unit 22 so that the raw water supplied into the main body container 3 does not flow back to the water supply hose 21 side.

The raw water in the main body container 3 is
It flows between the cylindrical portion 5 and the cartridge 1, and is sent to the inside of the cartridge 1 from a cartridge water passage port 24 formed through the cartridge 1. Raw water that has entered the cartridge chamber 26 passes through the nonwoven fabric 2c. The non-woven fabric 2c removes coarse dust and iron rust from raw water.

Next, the water passes through the adsorbent layer 2b, and the adsorbent layer 2b adsorbs or decomposes and removes the odor and mold odor of raw water, other organic compounds, and organic solvents. afterwards,
The purified water filtered by the hollow fiber membrane layer 2a for minute substances, bacteria, etc. passes through the outlet of the cartridge 1 and collects in the purified water collection chamber 25. The collected purified water passes through the purified water pipe 28 and is discharged from the purified water outlet 29.

The raw water supplied from the water supply hose often contains gas in the pipe, and this gas is sent to the hollow fiber membrane layer 2a together with running water. At this time, by providing the hydrophobic hollow fiber membrane 2a ₂ in a part of the hollow fiber membrane layer 2a, the gas sent to the hollow fiber membrane 2a passes through the membrane at the hydrophobic portion without accumulating on the membrane surface. Therefore, it is possible to perform water purification without lowering the filtration efficiency (Jitsuko Sho 63-2).
No. 1294).

After the water is stopped, the water accumulated in the cartridge 1, the purified water collecting chamber 25 and the purified water accumulated in the purified water pipe 28 are
By the outside air entering from the purified water outlet 29, the water is discharged from the cartridge water passage port 24 to the outside of the cartridge, and then from the water drain valve body 33 in the water drain unit 32 to the water drain hose 34.
And is discharged to the outside of the main body container.

By draining the water in the cartridge 1 or the purified water accumulated on the outlet side of the filter body, long-term water retention in the cartridge 1 is prevented, and the anaerobic property in the cartridge due to this is prevented. It is possible to prevent the generation of bacteria and the discharge of purified water with an offensive odor.

[0009]

In the water purifier, when the water in the cartridge 1 is drained, the outside air is taken in from the water purification outlet 29. At this time, if the outside air takes in a gas in a bad environment with many dusts, bacteria, etc., there is a risk that the water discharge side end surface 8 of the porous hollow fiber membrane will be contaminated by these, and once the water discharge side end surface is contaminated, Next, there was a problem that the filtered purified water was also supplied in a polluted state.

Further, depending on the shape of the water purification pipe 28 and the position of the water purification outlet 29, it may be difficult to take in the outside air and the water inside the cartridge 1 may not be drained sufficiently. Particularly, in the water purifier in which the purified water collecting chamber is arranged below the filter body and the purified water outlet is arranged above it as shown in FIG. 10, the drainage is performed by taking in outside air from the water outlet side of the filter body. Couldn't expect.

The present invention effectively solves the above-mentioned problems. When the water inside the cartridge is drained, the filter body is prevented from being contaminated due to the intake of contaminated outside air, and the clean water collecting chamber is located below the filter body. It is an object of the present invention to provide a water purifier capable of sufficiently draining water even in a water purifier having a structure in which the water purification outlet is disposed above the water purification valve.

[0012]

The water purifier of the present invention takes in outside air from the outlet side of a filter body for purifying water after stopping water, and the water inside the filter body is removed from the cartridge containing the filter body. In the water purifier for discharging to, the water outlet side of the filter body is provided with a water purification water collection chamber in which a hydrophobic outside air filtration membrane is provided and which communicates with the water purification outlet.

As the shape of the hydrophobic outside air filtration membrane, a porous hollow fiber membrane or a porous flat membrane can be used.

Between the purified water collection chamber and the purified water outlet, a check valve,
When the water passage having the check mechanism portion including the check ball and the dispersion plate is provided, the inflow of the outside air from the purified water outlet can be completely blocked, which is more hygienic.

Between the purified water collecting chamber and the outside air filtration membrane, there is provided a water passage having a pressure shut-off mechanism section composed of an outside air filtration membrane check valve, an outside air filtration membrane check ball and an outside air filtration membrane dispersion plate. By doing so, it is possible to prevent water pressure from being applied to the outside air filtration membrane, so that the outside air filtration membrane can be made to last longer.

The present invention will be described in more detail. Examples of the filter used in the present invention include activated carbon, silver-impregnated activated carbon,
An adsorbent such as fibrous activated carbon, silver-impregnated fibrous activated carbon, powdered activated carbon, serpentine, calcium sulfite, or a filtration membrane such as a flat membrane or a hollow fiber membrane, or a combination of the adsorbent and the filtration membrane. A filter can be used.

It is more preferable to use both the adsorbent and the filtration membrane as the filter, because the adsorbent can filter out the odors of chlorine and mold, and the hollow fiber membrane can filter out the bacteria and turbidity components.

As the filtration membrane used for the filtration body, a filtration membrane which can prevent passage of bacteria and the like and has a permeability of 1.0 l / m ² · min or more at a water pressure of 1.0 kg / cm ^2. preferable. Examples of the material of this filtration membrane include various materials such as cellulose-based, polyolefin-based, polysulfone-based, polyvinyl alcohol-based, PMMA-based, and the like. Among such filtration membranes, a polyolefin-based porous membrane hydrophilized with a hydrophilizing agent such as a saponification product of ethylene-vinyl acetate copolymer (ethylene-vinyl alcohol-based copolymer) is particularly preferable. Can be mentioned.

As for the shape of the filtration membrane, when a U-shaped bundle in which the end is focused and fixed with a fixing material while the open end is kept open or a porous hollow fiber membrane bundle with the other end sealed is used, It is preferable because a high filtration flow rate can be obtained.

The filter body is a U-shaped type in which the end is focused and fixed with a fixing material while keeping the open end in an open state, or a total volume filtration type in which a porous hollow fiber membrane bundle having the other end sealed is housed inside. A hollow fiber membrane module having a porous hollow fiber membrane comprising a porous hollow fiber membrane having a hydrophobic portion on at least a part of the membrane surface of a porous hollow fiber membrane bundle and a hydrophilic porous membrane. Since the air that has entered through the pipe is filtered by the hydrophobic hollow fiber membrane, water purification can be performed without lowering the filtration efficiency, which is more preferable.

The outside air filtration membrane used in the present invention is
It is for filtering the outside air at the time of draining water, and introducing only clean air into the filter material.By using a hydrophobic material, the purified water in the internal water collection chamber does not pass,
Only air from the outside can pass through.

The outside air filter is a porous hollow fiber membrane or a flat membrane capable of preventing the passage of dust, bacteria and the like, and is 3.0 × 10 ⁴ l at an air pressure of 0.5 kg / cm ^2. /
Those having a transmittance of m ² · hr or more are preferable. As the material of the hydrophobic outside air filtration membrane, for example, cellulose-based,
Various materials such as polyolefin-based, polysulfone-based, polyvinyl alcohol-based, PMMA-based, etc. can be mentioned.

Among such outside air filtration membranes, it is particularly preferable to use a porous hollow fiber membrane having a high flexibility of the membrane and having a high air permeation amount, which has high processability and drainage ability. You can get a water purifier.

The non-return mechanism used in the present invention is a mechanism for sending purified water to the purified water outlet when passing water and preventing outside air from flowing into the purified water collecting chamber from the purified water outlet when the water is stopped. is there.

The pressure cutoff mechanism used in the present invention is to guide the clean outside air filtered by the hydrophobic filtration membrane to the purified water collecting chamber when the water is stopped, and at the same time, to the outside air filtration membrane during the passage of water. Is a mechanical part for preventing the load from being applied.

[0026]

In the water purifier of the present invention, the water outlet side of the filter body is provided with a water purification water collection chamber which is in communication with the water purification outlet and in which a hydrophobic outside air filtration membrane is disposed. Therefore, when water is removed from the water purifier after stopping the water, the air that has been cleanly filtered by the outside air filtration membrane is introduced, so even if the outside air in a bad environment with a lot of dust, bacteria, etc. is taken in, the filter body The end faces are not contaminated by these.

Further, in the water purifier of the present invention, even a water purifier having a structure in which the purified water collecting chamber is arranged below the filter body and the purified water outlet is arranged above it is sufficient to drain water. It is possible.

[0028]

The present invention will be described below in detail with reference to examples. [Embodiment 1] FIG. 1 is a mechanism diagram showing an embodiment of a water purifier according to the present invention, FIG. 2 is an assembly mechanism diagram of the water purifier of the present embodiment, and FIG. 3 is a top view of the water purifier of the present embodiment. It is an external view. The water purifier is provided with a filter body for purifying and filtering raw water, a cartridge 1 that encloses the filter body, and a main body container 3 that detachably accommodates the cartridge 1. In the present invention, the cartridge used was a cartridge manufactured by Mitsubishi Rayon Co., Ltd., product number KCO0827.

The main body container 3 covers almost the whole of the cartridge 1 and has a bottomed cylindrical tubular portion 5 having an opening 11 through which the cartridge 1 is taken in and out, and the opening 11 of the tubular portion 5. It has a lid portion 4 for covering the tubular portion 5, a fastening member 12 for attaching the lid portion 4 to the tubular portion 5, and a packing 6 arranged between the tubular portion 5 and the lid portion 4 and sealing them.

In the opening 11 of the tubular portion 5, the fastening members 12 are provided at positions equally divided into three with the center of the tubular portion 5 as an axis.
A rod member 13 to be fitted with is arranged. Stainless steel (SUS304) was used as the material of the main body container 3, the fastening member 12, and the rod member 13, and the thickness of the main body container 3 was set to 0.8 mm. The tip of one end of the rod member 13 of the mounting portion is formed in a screw shape, and the main body container 3
3 evenly in the opening 11 of the tubular body 5 about the central axis of
The other end of the rod member 13 is TIG welded to the equally divided position.

The assembling work of the water purifier according to the present invention will be described with reference to FIG. First, attach the cartridge 1 to the lid 4
It is screwed to the cartridge mounting portion 17 arranged in the, and is airtightly fixed by the O-ring 18, and the water collecting chamber 25
To form.

The same number of rod members 13 as the rod through holes 15 provided in the lid portion 4 are attached to the opening 11 of the tubular portion 5 and penetrate the rod through holes 15 of the lid portion 4 to which the cartridge 1 is attached. Let it extend to the outside. The rod member 13 is provided with a rod member tip threaded portion 16, into which the fastening member 12 is screw-fitted, the lid portion 4 is attached to the tubular portion 5, and the packing 6 is pressed and integrated.
At this time, the seal packing 14 is placed so that there is no leakage from the rod through hole 15, and the fastening member 12 is pressed together when screwed.

The thread diameter, screw pitch, number of threads, etc. of the rod member tip threaded portion 16 and the fastening member 12 formed at one end of the rod member 13, and the amount at which the rod member 13 and the fastening member 12 are arranged. Etc. can be arbitrarily set according to the target performance specifications of the water purifier.

Further, the lid portion 4 and the tubular portion 5 are respectively formed with a lid portion-side pushing portion 19 and a tubular portion-side pushing portion 20 for folding and packing the packing 6 at the end portions of the opening. There is. The shape can be arbitrarily set in accordance with the target performance specifications of the water purifier, such as the shape, the material, the thickness, etc. together with the packing material 6.

Further, the rod member tip threaded portion 16 formed at one end of the rod member 13 does not necessarily have to be formed by a screw. For example, one end of the rod member 13 may have an engagement protrusion, and a fastening member having an engagement groove inside which is fitted to the engagement protrusion may be used on the fastening member 12 side.

The water purifier of this embodiment will be described below with reference to the flow of water with reference to FIG. The supplied raw water is supplied to the water supply hose 21 by switching a switching valve (not shown) attached to the faucet. Raw water enters the water supply port unit 22 from the water supply hose 21 and is supplied into the main body container 3. At this time, a backflow prevention valve 23 is arranged in the water supply port unit 22 so that the raw water supplied into the main body container 3 does not flow back to the supply hose 21 side.

The raw water contained in the main body container flows between the cylindrical portion 5 and the cartridge 1 and is fed into the cartridge 1 through the cartridge water passage hole 24 formed through the cartridge 1. Raw water that has entered the cartridge chamber 26 through the cartridge water passage hole 24 is
Of the non-woven fabric 2c. The non-woven fabric 2c removes coarse dust and iron rust from raw water.

Next, the water to be treated passes through the adsorbent layer 2b, and the adsorbent layer 2b adsorbs or decomposes and removes the chlorine odor and mold odor in the tap water, other organic compounds, organic solvents and the like. After that, the hollow fiber membrane layer 2a as a filtration membrane blocks passage of minute substances, bacteria, etc., passes through the outlet of the cartridge 1, and the purified water collects in the purified water collection chamber 25. The collected purified water passes through the purified water pipe 28 and is discharged from the purified water outlet 29.

The lid 4 is provided with an air intake valve 30 for draining water to be treated between the cartridge 1 and the main body container 3 after using the water purifier, and a water draining unit 32 at the bottom of the tubular portion 5. It is set up.

An outside air filtration membrane supporting outer cylinder 41 for protecting the outside air filtration membrane is attached to the purified water collection chamber 25. In the outside air filtration membrane supporting outer cylinder 41, a hydrophobic outside air filtration membrane 40 made of polyethylene hollow fiber membrane EHF270T manufactured by Mitsubishi Rayon Co., Ltd. is liquid-tightly fixed using an outside air filtration membrane fixing member 43. A urethane resin was used for the outside air filtration membrane fixing member.

After stopping the water, the outside air first enters through the outside air intake hole 42 formed in the outside air filtration membrane support outer cylinder 41, and the outside air filtration membrane 40 filters dust and bacteria of the outside air to obtain a clean gas. And is taken into the purified water collection room 25. By introducing the outside air from the outside air filtration membrane, the purified water in the purified water pipe is discharged from the purified water outlet. Further, the water remaining in the cartridge is also discharged into the main body container from the cartridge water supply port, then passed through the water drain valve body 33, and drained to the outside of the main body by the water drain hose 34.

The hydrophobic filtration supporting outer cylinder 41 is the purified water collecting chamber 25.
The airtight seal member 44 and the like may be used together so as to be removable. The drainability after using purified water was good.

This water purifier is installed in an atmosphere in which 3500 or more particles of 0.5 μm or more exist in the outside air per liter, and continuous water flow is performed at a flow rate of 4.0 l / min for 2 minutes every hour.
The water was removed from the water purifier after stopping the water 10 times a day, and this was continued for 1 month.

The first running water of the purified water after one month was sampled, and the number of fine particles of 0.5 μm or more was measured using an underwater particle counter KL-01 manufactured by Rion Co., Ltd. Furthermore, the above test was continued for 3 months, and the same measurement was performed for the initial running water after 3 months. Table 1 shows the results.

[0045]

[Table 1]

[Comparative Example 1] FIG. 9 shows a mechanism diagram of the water purifier used in this Comparative Example. The water purifier of this comparative example has the same structure as the water purifier of Example 1 except that it does not have a hydrophobic outside air filtration membrane in the water purification chamber. Using this water purifier, measurement was performed under the same conditions as in Example 1. The results are shown in Table 1. As can be seen, in the comparative example, contamination of the filter body was confirmed, whereas in Example 1 in which the outside air filter body was provided in the purified water collection chamber, no fine particles were detected and the filter body was clean. It is confirmed that the state is maintained.

[Embodiment 2] FIG. 4 is an enlarged view showing an embodiment of the water purifier of the present invention showing a purified water collecting chamber when water is stopped. Check valve 50, check ball 51, dispersion plate 5 in the purified water collection chamber 25.
A water purifier with the same specifications as in Example 1 was prepared, except that a water passage having a check valve mechanism section 2 was provided.

A silicon resin ball having a diameter of 10 mm was used as the check ball 51, and a check valve 50 having an inclination of about 10 to 20 degrees was provided so that the check ball 51 did not fall downward. The dispersion plate is provided with a plurality of holes having a diameter smaller than that of the check ball. During the passage of water, the purified water processed by the cartridge 1 flows from the bottom to the top, the check ball 51 is in a floating state, and the purified water flows to the purified water outlet. The non-return ball 51 stays in the purified water collection chamber 25 from the dispersion plate 52.

After the water is stopped, the check ball 51 falls and is blocked by the check valve 50, so that the inflow of the outside air from the purified water outlet 29 is completely shut off at the time of draining the water, and it passes through the outside air filtration membrane. Only the clean air is flowed into the clean water collecting chamber 25, and the filter body can be kept clean. As a result of passing water, drainage was good.

[Embodiment 3] FIG. 5 is an enlarged view showing an embodiment of the water purifier of the present invention showing a purified water collecting chamber when water is stopped. Between the purified water collection chamber 25 and the outside air filtration membrane, there is provided a water passage having a pressure shut-off mechanism portion including an outside air filtration membrane check valve 60, an outside air filtration membrane check ball 61, and an outside air filtration membrane dispersion plate 62. A water purifier having the same specifications as in Example 2 except that the water purifier was arranged was prepared.

Φ6 as the non-return ball 61 for the outside air filtration membrane
mm of silicone resin ball, the check valve 61 for the outside air filtration membrane that prevents the load of water pressure on the outside air filtration membrane by the check ball 61 for the outside air filtration membrane, and the check ball 61 for the outside air filtration membrane are the clean water collection chamber. An outside air filtration membrane dispersion plate 62 having a plurality of holes each having a diameter smaller than that of the outside air filtration membrane non-return ball 61 is provided to prevent entry into the 25 side.

During the passage of the water, the purified water treated by the cartridge 1 flows from the bottom to the top, the check ball 51 is in a floating state, and the purified water flows to the purified water outlet. The non-return ball 51 stays in the purified water collection chamber 25 from the dispersion plate 52. Further, since the check valve 60 for the outside air filtration membrane is blocked by the outside air filtration membrane check ball 61 by the pressure of the purified water, the water pressure in the purified water collection chamber 25 is not directly applied to the outside air filtration membrane. The outside air filtration membrane is not damaged by water pressure.

When the water is stopped, the non-return ball 61 for the outside air filtration membrane falls to the dispersion plate 62 for the outside air filtration membrane, and the clean air obtained by filtering the outside air flows into the purified water collecting chamber 25. In addition, the check ball 51 falls to close the check valve 50, and the purified water outlet 29
Since the inflow of outside air from is completely blocked, the filter body can be kept clean. As a result of passing water, the drainability was good.

Using this water purifier, with the water purification outlet 29 blocked, 11.5 kg / cm was placed inside the water purifier body container.
The water pressure of ² was applied continuously for 15 minutes, but the outside air filtration membrane was not damaged, and the subsequent drainage property was also very good.

[Embodiment 4] FIG. 6 is an enlarged view of the purified water collection chamber of the water purifier according to the present embodiment. In this embodiment,
The same specifications as in Example 1 were used except that a CVGB hydrophobic flat membrane (pore size 0.22 μm) manufactured by Japan Millipore Limited was used as the hydrophobic outside air filtration membrane. The drainage property after passing water was good.

[Embodiment 5] FIG. 7 is an enlarged view of the purified water collection chamber of the water purifier according to the present embodiment. In this embodiment,
The same specifications as in Example 2 were used except that a CVGB hydrophobic flat membrane (pore size 0.22 μm) manufactured by Japan Millipore Limited was used as the hydrophobic outside air filtration membrane. The drainage property after passing water was good.

[Sixth Embodiment] FIG. 3 is an enlarged view of a purified water collection chamber of a water purifier according to this embodiment. In this embodiment,
The same specifications as in Example 3 were used except that a hydrophobic flat air membrane (pore size 0.22 μm) of CVGB manufactured by Japan Millipore Limited was used as the hydrophobic outside air filtration membrane. The drainage property after passing water was good.

[0058]

According to the present invention, when the outside air is taken in for draining the inside of the cartridge, clean air filtered by the outside air filtration membrane provided in the water collecting chamber is introduced, so that dust is generated. , Even in a bad environment with many bacteria,
Since the filter medium can be kept in a sanitary state, sanitary purified water can always be supplied. Further, according to the water purifier of the present invention, even in the water purifier in which the water purification outlet is disposed in the lower part of the filter body portion, since it has an air intake port on the purified water outlet side, It is possible to easily drain the purified water on the outlet side.

[Brief description of drawings]

FIG. 1 is a mechanism diagram showing an embodiment of a water purifier of the present invention.

FIG. 2 is an assembly mechanism diagram of the water purifier of the first embodiment.

FIG. 3 is an external view of the water purifier of Example 1 as viewed from above.

FIG. 4 is one embodiment of the present invention, in which a porous hollow fiber membrane is used as an outside air filtration membrane, and a water passage having a check mechanism portion is provided between the purified water collection chamber and the purified water outlet. It is an enlarged view of the clean water collection room (when the water is stopped).

FIG. 5 is one embodiment of the present invention, in which a porous hollow fiber membrane is used as an outside air filtration membrane, and a water passage having a pressure cutoff mechanism is provided between the purified water collection chamber and the outside air filtration membrane. It is an enlarged view of the clean water collection room (when the water is stopped).

FIG. 6 is an embodiment of the present invention, and is an enlarged view of a purified water collection chamber when a porous flat membrane is used as an outside air filtration membrane.

FIG. 7 is one embodiment of the present invention, in which a porous flat membrane is used as an outside air filtration membrane, and a water passage having a check mechanism portion is provided between the purified water collection chamber and the purified water outlet. It is an enlarged view of the clean water collection chamber (when water is stopped)

FIG. 8 is an embodiment of the present invention, in which a porous flat membrane is used as the outside air filtration membrane, and a water passage having a pressure cutoff mechanism is provided between the purified water collection chamber and the outside air filtration membrane. It is an enlarged view of the purified water collection chamber (when water is stopped).

FIG. 9 is a mechanism diagram showing a conventional water purifier.

FIG. 10 is a mechanism diagram showing a conventional water purifier.

[Explanation of symbols]

1; Cartridge 23; Non-return check valve 2; Filter body 24; Cartridge water passage hole 2a1; Hydrophilic hollow fiber membrane 25; Purified water collection chamber 2a2; Hydrophobic hollow fiber membrane 26; Cartridge chamber 2b; Adsorbent layer 27; Pipe nut 2c; Non-woven fabric 28; Water purification pipe 3; Main body container 29; Water purification outlet 4; Lid portion 30; Air intake port 5; Cylindrical portion 31; Valve 0 ring 6; Packing 32; Water draining unit 7; Hollow fiber membrane Fixing member 33; drain valve 8; hollow fiber membrane filtration side end 34; drain hose 11; opening 37; purified water pipe joint 12; fastening member 38; purified water pipe joint O-ring 13; rod member 40; outside air filtration Membrane 14; Seal packing 41; Outside air filtration membrane supporting outer cylinder 15; Rod through hole 42; Outside air intake port 16; Rod member tip screw portion 43; Outside air filtration Membrane fixing member 17; Cartridge mounting part 44; Airtight seal 18; O-ring 50; Check valve 19; Lid side pressing part 51; Check ball 20; Cylindrical part side pressing part 52; Dispersion plate 21; Water supply hose 60 A check valve for outside air filtration membrane 22; a water supply unit 61; a check ball for outside air filtration membrane 62; a dispersion plate for outside air filtration membrane

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[Procedure amendment]

[Submission date] June 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

The outside air filtration membrane is a porous hollow fiber membrane or a flat membrane capable of blocking the passage of dust and bacteria, and is 3.0 × 10 ⁴ l at an air pressure of 0.5 kg / cm ^2. /
Those having a transmittance of m ² · hr or more are preferable. As the material of the hydrophobic outside air filtration membrane, for example, cellulose-based,
Various materials such as polyolefin-based, polysulfone-based, polyvinyl alcohol-based, PMMA-based, etc. can be mentioned.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction content]

[Comparative Example 1] FIG. 9 shows a mechanism diagram of the water purifier used in this Comparative Example. The water purifier of this comparative example has the same structure as the water purifier of Example 1 except that it does not have a hydrophobic outside air filtration membrane in the water purification chamber. Using this water purifier, measurement was performed under the same conditions as in Example 1. The results are shown in Table 1. As can be seen from this, in the comparative example, the filter body was confirmed to be contaminated, whereas the outside water was filtered in the clean water collection chamber.
In Example 1 in which the membrane is provided, no fine particles are detected, and it is confirmed that the filter body is maintained in a clean state.

Claims (6)

[Claims] 1. A water purifier that takes in outside air from the outlet side of a filter body for purifying water after stopping water and discharges the water inside the filter body to the outside of a cartridge containing the filter body. A water purifier characterized in that it is provided with a water purification chamber on the water outlet side, which is connected to the water purification outlet and has a hydrophobic outside air filtration membrane. 2. The water purifier according to claim 1, wherein the outside air filtration membrane comprises a porous hollow fiber membrane. 3. The water purifier according to claim 1, wherein the outside air filtration membrane is made of a porous flat membrane. 4. A water passage having a non-return mechanism including a non-return valve, a non-return ball, and a dispersion plate is provided between the purified water collection chamber and the purified water outlet. The water purifier according to Item 1. 5. A pressure cutoff mechanism section comprising a check valve for the outside air filtration membrane, a check ball for the outside air filtration membrane, and a dispersion plate for the outside air filtration membrane is provided between the purified water collection chamber and the outside air filtration membrane. The water purifier according to claim 1, further comprising a water passage. 6. A U-shaped member whose end is focused and fixed with a fixing material while the end of the filter is kept open, or a porous hollow fiber membrane bundle having the other end sealed therein. A hollow fiber membrane module having a complete filtration, having a porous hollow fiber membrane composed of a porous hollow fiber membrane having a hydrophobic portion on at least a part of the membrane surface of a porous hollow fiber membrane bundle and a hydrophilic porous membrane. The water purifier according to claim 1, characterized in that.