JPH08257374A - Hollow yarn membrane module - Google Patents

Abstract

PURPOSE: To protect an air venting member from damage by forming a large number of recessed and protruding parts to the inner surface of the passage formed by forming the air venting member into a bag shape using a hydrophobic porous sheet. CONSTITUTION: A hollow yarn membrane module is formed by housing hollow yarn membranes in a cylindrical case of which one opening is closed by a posting material and opening the end parts of the hollow yarn membranes to the outer surface of the potting material. An air venting member 5 having a passage part 10 provided therein by forming a hydrophobic porous sheet 4 into a bag shape is provided in the case. Air contained in the water injected into the case is introduced into the passage part 10 through the porous sheet 4 to be discharged to the outside of the case. In this case, a large number of recessed and protruding parts 6 are formed to the inner surface of the passage part 10. By this constitution, when the air venting member 5 is collapsed by the pressure of the water flowing through the case, the mutual adhesion of the inner surface of the passage part 10 is prevented without providing a spacer to the passage part 10 and the air venting member 5 is protected from damage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow fiber membrane module used in a water purifier such as a full-volume filtration type water purifier.

[0002]

2. Description of the Related Art As a water purifier for home use, it has been proposed to use a hollow fiber membrane to purify water. However, this hollow fiber membrane is packed in a case in a state of being bundled in a large number. The hollow fiber membrane module is housed in a cartridge type and attached to a water purifier. As shown in FIG. 7, in the hollow fiber membrane module, one opening of a cylindrical case 1 whose both ends are open is closed with a potting material 2, and a large number of hollow fiber membranes 3 are bent into a U shape inside the case 1. The case 1 is formed by allowing both ends of the hollow fiber membrane 3 to pass through the potting material 2 and opening at the outer surface of the potting material 2.
Water, such as water-conducting water, flows into the case 1 through the other opening of the hollow fiber membrane 3 and the water is introduced into the hollow holes in the hollow fiber membrane 3 through the membrane wall of the hollow fiber membrane 3 to form the hollow fiber membrane 3 in the potting material 2. The water is led out from the end of. Then, the water is filtered and purified when passing through the membrane wall of the hollow fiber membrane 3.

When air is mixed into the water flowing into the case 1 in the form of bubbles, the bubbles adhere to the surface of the hollow fiber membrane 3 and the surface area of the hollow fiber membrane 3 decreases. Therefore, less water passes through the hollow fiber membrane 3,
There is a problem that the flow rate of water in the hollow fiber membrane module decreases. Therefore, the hollow fiber membrane module is provided with the air vent member 5 as shown in FIG.

As shown in FIG. 8, the air vent member 5 has a pair of hydrophobic porous sheets 4 opposed to each other with a breathable material, for example, non-woven fabric, interposed as spacers 15, and the three sides of the hydrophobic porous sheet 4. Formed by adhering the end portions of each other as the adhering portion 11 by thermocompression bonding or an adhesive to form a bag shape with one end open, and adhering the hydrophobic porous sheets 4 as the joint portion 12 at a plurality of locations. Has been done. Inside the air bleeding member 5, a space 10 is formed between the adhesive portion 11 and the joint portion 12 or between the joint portions 12 to pass air.

The spacer 15 is for preventing the air vent member 5 from being crushed by the pressure of the water flowing in the case 1 so that the hydrophobic porous sheets 4 are in close contact with each other and the passage portion 10 is not blocked. However, in order to fill the entire inside of the passage portion 10, the spacer 15 is made of a breathable material. When attaching the air vent member 5 to the hollow fiber membrane module, the air vent member 5 is housed in the case 1 and the end of the air vent member 5 on the opening side is penetrated through the potting material 2 to open on the outer surface of the potting material 2. When the air vent member 5 is provided in the hollow fiber membrane module in this way, the air mixed as water in the form of bubbles passes through the hydrophobic porous sheet 4 and the passage portion 10 of the air vent member 5. Air is then introduced into the hollow fiber membrane module through the opening of the air vent member 5 through the spacer 15 of the passage portion 10, and by the action of the air vent member 5, the water in the hollow fiber membrane module is discharged. It was possible to prevent the flow rate from decreasing.

[0006]

However, in the air vent member 5 of the above-mentioned conventional example, since the spacer 15 having small strength and air permeability is filled in the entire passage portion 10, the case 1
There is a possibility that the spacer 15 is deformed by the pressure of the water flowing inside, and the pressure due to this deformation is applied to the adhesive portion 11 and the joint portion 12 and the air vent member 5 is damaged.

The present invention has been made in view of the above points, and an object of the present invention is to provide a hollow fiber membrane module which can prevent the air vent member from being damaged.

[0008]

In the hollow membrane module according to claim 1 of the present invention, one opening of a cylindrical case 1 is closed by a potting material 2 and the hollow fiber membrane 3 is housed in the case 1. At the same time, the end of the hollow fiber membrane 3 is opened on the outer surface of the potting material 2, and the hydrophobic porous sheet 4 is used to remove the air vent member 5.
The bag 1 is formed into a bag, and the passage portion 10 is formed inside the case 1.
The air vent member 5 is housed inside, and the passage portion 10 of the air vent member 5 is opened at the outer surface of the potting material 2, and the air contained in the water flowing into the case 1 from the other opening of the case 1 is a hydrophobic porous sheet. Air vent member 5 through 4
In the hollow fiber membrane module in which the air is introduced into the passage portion 10 and the air is discharged from the opening of the passage portion 10 to the outside of the case 1, a large number of irregularities 6 are formed on the inner surface of the passage portion 10. Hollow fiber membrane module.

In the hollow membrane module according to the second aspect of the present invention, one opening of the cylindrical case 1 is closed by the potting material 2, the hollow fiber membrane 3 is housed in the case 1, and the hollow fiber membrane 3 is accommodated. Is opened at the outer surface of the potting material 2, the air vent member 5 is formed in a bag shape with the hydrophobic porous sheet 4 to form the passage portion 10 inside, and the air vent member 5 is housed in the case 1. Passage part 10 of air vent member 5
Is opened on the outer surface of the potting material 2, and the air contained in the water flowing into the case 1 through the other opening of the case 1 is passed through the hydrophobic porous sheet 4 and the passage portion 1 of the air vent member 5 is opened.
In the hollow fiber membrane module which is introduced into 0 and discharges the air from the opening of the passage portion 10 to the outside of the case 1, the inner surface of the passage portion 10 is provided with the concave groove 7 and the ridge 9 extending to the opening of the passage portion 10. It is characterized in that at least one is formed.

In the hollow membrane module according to the third aspect of the present invention, one opening of the cylindrical case 1 is closed with the potting material 2, the hollow fiber membrane 3 is housed in the case 1, and the hollow fiber membrane 3 is accommodated. Is opened at the outer surface of the potting material 2, the air vent member 5 is formed in a bag shape with the hydrophobic porous sheet 4 to form the passage portion 10 inside, and the air vent member 5 is housed in the case 1. Passage part 10 of air vent member 5
Is opened on the outer surface of the potting material 2, and the air contained in the water flowing into the case 1 through the other opening of the case 1 is passed through the hydrophobic porous sheet 4 and the passage portion 1 of the air vent member 5
In the hollow fiber membrane module in which the air is introduced to the outside of the case 1 from the opening of the passage portion 10, the air bleeding member 5 is formed by the crepe-shaped hydrophobic porous sheet 4.
It is characterized by being formed.

In the hollow membrane module according to a fourth aspect of the present invention, one opening of the cylindrical case 1 is closed with a potting material 2, the hollow fiber membrane 3 is housed in the case 1, and the hollow fiber membrane 3 is provided. Is opened at the outer surface of the potting material 2, the air vent member 5 is formed in a bag shape with the hydrophobic porous sheet 4 to form the passage portion 10 inside, and the air vent member 5 is housed in the case 1. Passage part 10 of air vent member 5
Is opened on the outer surface of the potting material 2, and the air contained in the water flowing into the case 1 through the other opening of the case 1 is passed through the hydrophobic porous sheet 4 and the passage portion 1 of the air vent member 5 is opened.
In the hollow fiber membrane module which is introduced into 0 and discharges the air from the opening of the passage portion 10 to the outside of the case 1, a spacer 8 is partially provided inside the passage portion 10. Is.

In the hollow membrane module according to the fifth aspect of the present invention, one opening of the cylindrical case 1 is closed with a potting material 2, the hollow fiber membrane 3 is housed in the case 1, and the hollow fiber membrane 3 is accommodated. Is opened at the outer surface of the potting material 2, the air vent member 5 is formed in a bag shape with the hydrophobic porous sheet 4 to form the passage portion 10 inside, and the air vent member 5 is housed in the case 1. Passage part 10 of air vent member 5
Is opened on the outer surface of the potting material 2, and the air contained in the water flowing into the case 1 through the other opening of the case 1 is passed through the hydrophobic porous sheet 4 and the passage portion 1 of the air vent member 5 is opened.
In the hollow fiber membrane module which is introduced into 0 and discharges the air from the opening of the passage portion 10 to the outside of the case 1, one surface 20a of the two surfaces 20a, 20b facing each other of the passage portion 10 is provided. The length in the width direction is longer than the length in the width direction along the surface of the other surface 20b.

[0013]

The hollow membrane module according to claim 1 of the present invention comprises:
Since many irregularities 6 are formed on the inner surface of the passage portion 10, the irregularities 6 can be interposed between the opposing inner surfaces of the passage portion 10, and the air vent member 5 is crushed by the pressure of the water flowing in the case 1. At times, it is possible to prevent the inner surfaces of the passage portion 10 from being brought into close contact with each other even if the passage portion 10 is not provided with a spacer.

In the hollow membrane module according to the second aspect of the present invention, since at least one of the groove 7 and the ridge 9 reaching the opening of the passage portion 10 is formed on the inner surface of the passage portion 10, the passage portion 10 faces each other. The concave groove 7 or the convex strip 9 can be interposed between the inner surfaces of the passage portion 10 and the passage portion 10 without a spacer when the air bleeding member 5 is crushed by the pressure of water flowing in the case 1. The inner surfaces of 10 can be prevented from adhering to each other.

In the hollow membrane module according to the third aspect of the present invention, since the air vent member 5 is formed by the crepe-shaped hydrophobic porous sheet 4, the hydrophobic porous sheet is provided between the inner surfaces of the passage portion 10 facing each other. 4 can be interposed, and when the air bleeding member 5 is crushed by the pressure of water flowing in the case 1, the inner surfaces of the passage portions 10 can be separated from each other even if the passage portions 10 are not provided with spacers. You can prevent them from sticking together.

In the hollow membrane module according to the fourth aspect of the present invention, since the spacer 8 is partially provided inside the passage portion 10, the spacer 8 can be interposed between the inner surfaces of the passage portion 10 facing each other. Therefore, when the air vent member 5 is crushed by the pressure of water flowing in the case 1, it is possible to prevent the inner surfaces of the passage portion 10 from coming into close contact with each other.
By partially providing the spacer 8 inside the passage portion 10, even if the spacer 8 is deformed by water pressure, pressure can be prevented from being applied to the joint portion between the hydrophobic porous sheets 4.

In the hollow membrane module according to the fifth aspect of the present invention, of the two facing surfaces 20a, 20b of the passage portion 10, the length in the width direction along the surface of one surface 20a is the other surface 20b. Since it is formed to be longer than the length in the width direction along the surface of the case 1, even if the air vent member 5 is crushed by the pressure of water flowing in the case 1, the longer surface 20a is distorted and the passage portion 10
The inner surfaces facing each other can be prevented from completely adhering to each other.

[0018]

EXAMPLES The present invention will be described in detail below with reference to examples. As the case 1, a cylindrical case having open ends can be used. As the potting material 2, one obtained by curing a potting agent such as urethane resin can be used. A conventionally used hydrophilic porous hollow fiber membrane or the like can be used as the hollow fiber membrane 3, and the hydrophilic porous hollow fiber membrane can be formed of a cellulose-based or polyvinyl alcohol-based material.

As the hydrophobic porous sheet 4, those conventionally used can be used as they are, for example, materials such as polyolefin type, fluorocarbon type, polyester type, polyamide type, ethylene-vinyl alcohol copolymer and the like. Can be formed. In producing the hollow fiber membrane module of the present embodiment from the above materials, first, a pair of hydrophobic porous sheets 4 are prepared and stacked, and the end portions of the hydrophobic porous sheet 4 are heated over the entire circumference. Forming the adhesive portion 11 by adhesion with pressure bonding or an adhesive,
Two portions in the width direction of the hydrophobic porous sheet 4 are bonded by thermocompression bonding or an adhesive or the like to provide the joint portion 12 over the entire length in the direction parallel to the longitudinal direction to form a bag. Adhesive part 1 inside the bag
Voids between 1 and the joint portion 12 and between the joint portions 12 are formed as passage portions 10.

Next, the bag is disposed in the case 1 with one end thereof slightly protruding from one opening of the case 1, and is disposed in the substantially central part of the case 1, and a large number of hollow fiber membranes 3 are formed in a U shape. It is arranged around the bag inside the case 1 in a state of being bent and having both ends thereof slightly projected from one opening of the case 1.
Next, a potting material is filled in this opening of the case 1 and cured to form a potting material 2 and the potting material 2
The bag and the hollow fiber membrane 3 are supported by, and both ends of the hollow fiber membrane 3 protruding from the case 1 and the end of the bag are cut off. It is possible to form a hollow fiber membrane module in which the air bleeding member 5 formed by the above is housed in the case 1.

In this hollow fiber membrane module, the hollow hole of the hollow fiber membrane 3 and the passage portion 10 of the air vent member 5 are open to the outer surface of the potting material 2. Further, by forming the air vent member 5 with the hydrophobic porous sheet 4,
It is possible to make it difficult for water to pass through the film surface of the air bleeding member 5, prevent air bubbles from adhering to the air bleeding member 5, and prevent the efficiency of air bleeding from decreasing.

1 (a) and 1 (b) are partial sectional views of an air vent member 5 used in one embodiment of the present invention. A large number of concavities and convexities 6 are formed on the inner surfaces of the air vent member 5 that face the passage portion 10. The unevenness 6 includes a projection 6a provided on one inner surface and a projection 6a provided on the other inner surface such that a recess 6b provided on one inner surface and a recess 6b provided on the other inner surface face each other. They are formed so as to face each other.

When water flows into the case 1 of the hollow fiber membrane module having the air vent member 5 as shown in FIG.
As shown in (b), the air vent member 5 is crushed by water pressure. At this time, the projection 6a provided on one inner surface and the projection 6a provided on the other inner surface are brought into contact with each other so that the inner surfaces of the passage portion 10 facing each other are opposed to each other. It is possible to prevent them from coming into close contact with each other, and a gap is secured as the passage portion 10 in a portion where the recess 6b provided on one inner surface and the recess 6b provided on the other inner surface face each other. Then, the air contained as bubbles in the water is introduced into the passage portion 10 through the membrane surface of the air vent member 5 and the air is discharged from the opening of the passage portion 10 to the outside of the case 1. Thus, the hollow fiber membrane module The air can be removed.

As described above, in this embodiment, since the unevenness 6 is provided on the inner surface of the passage portion 10, even if the air vent member 5 is crushed by the water pressure, the protrusions 6a do not come into contact with each other so that the inner surfaces of the passage portion 10 do not adhere to each other. In addition, the concave portion 6b can be secured as the passage portion 10 through which air passes. Therefore, as in the above-mentioned conventional example, a spacer 1 having air permeability is provided in the passage portion 10.
Even if 5 is not provided, the passage portion 10 can be prevented from being completely closed. In this embodiment, the concavities and convexities 6 are provided on both of the facing inner surfaces of the passage portion 10, but they may be provided on only one inner surface.

2 (a) and 2 (b) are partial sectional views of the air vent member 5 used in another embodiment of the present invention.
A large number of recessed grooves 7 are formed on the inner surface of the passage portion 10 of the air bleeding member 5 facing each other, and the end portions of each recessed groove 7 communicate with the opening of the passage portion 10. Further, the concave groove 7 provided on one inner surface and the concave groove 7 provided on the other side are formed so as to be inclined so as to intersect each other.

When water flows into the case 1 of the hollow fiber membrane module having the air vent member 5 as shown in FIG.
As shown in (b), the air vent member 5 is crushed by water pressure. At this time, the passage portion 1 is formed in the portion other than the groove 7.
The inner surfaces facing each other of 0 are in close contact with each other, but the concave groove portion 7 is secured as a void. Then, the air contained in the water as bubbles is introduced into the groove 7 through the film surface of the air vent member 5 and the air is discharged from the opening of the passage portion 10 to the outside of the case 1 through the groove 7. The hollow fiber membrane module can be evacuated.

As described above, in this embodiment, since the concave groove 7 is provided on the inner surface of the passage portion 10, even if the air vent member 5 is crushed by the water pressure, the concave groove 7 can be secured as the passage portion 10 through which air passes. . Therefore, even if the air-permeable spacer 15 is not provided in the passage portion 10 unlike the above-mentioned conventional example,
It is possible to prevent the passage portion 10 from being completely closed. In this embodiment, the concave groove 7 is provided on both of the facing inner surfaces of the passage portion 10, but it may be provided on only one inner surface.

3 (a) and 3 (b) are partial sectional views of the air vent member 5 used in another embodiment of the present invention.
A large number of ridges 9 are formed on the inner surfaces of the passage portion 10 of the air bleeding member 5 facing each other, and the ends of the ridges 9 reach the openings of the passage portion 10. The ridge 9 provided on one inner surface and the ridge 9 provided on the other side are formed so as to be inclined so as to intersect each other.

When water flows into the case 1 of the hollow fiber membrane module having the air vent member 5 as shown in FIG.
As shown in (b), the air bleeding member 5 is crushed by water pressure. At this time, the ridges 9 provided on one inner surface and the ridges 9 provided on the other inner surface come into contact with each other and the inner surfaces of the passage portion 10 facing each other It is possible to prevent the inner surfaces of adjacent ridges 9 from adhering to each other so that they do not adhere to each other.
It can be secured as 0. Then, the air contained in the water as bubbles is introduced into the passage portion 10 through the membrane surface of the air vent member 5 and the air is discharged from the opening of the passage portion 10 to the outside of the case 1. Thus, the hollow fiber membrane module The air can be removed.

As described above, in this embodiment, since the ridge 9 is provided on the inner surface of the passage portion 10, even if the air bleeding member 5 is crushed by the water pressure, the ridge 9 abuts each other and the inner surfaces of the passage portion 10 are in close contact with each other. Instead, it is possible to secure a portion where the inner surfaces are not in close contact with each other as the passage portion 10 through which air passes. Therefore, it is possible to prevent the passage portion 10 from being completely closed without providing the air-permeable spacer 15 in the passage portion 10 as in the conventional example. In this embodiment, the ridges 9 are provided on both of the facing inner surfaces of the passage portion 10, but they may be provided on only one of the inner surfaces.

4 (a) and 4 (b) are partial sectional views of the air vent member 5 used in another embodiment of the present invention.
The air bleeding member 5 is formed by using a crepe-shaped hydrophobic porous sheet 4 which is wavy in an uneven shape, and a large number of wrinkles 14 are formed on the inner surface of the passage portion 10. When water flows into the case 1 of the hollow fiber membrane module including the air vent member 5, the air vent member 5 is crushed by water pressure as shown in FIG.
There are wrinkles 14 between the inner surfaces facing each other and the passage portion 1
It is possible to prevent the inner surfaces facing each other of 0 from adhering to each other, and the wrinkles 14 are secured as voids. Then, the air contained in the water as bubbles is introduced into the wrinkles 14 of the passage portion 10 through the film surface of the air vent member 5 and the air is discharged from the opening of the passage portion 10 to the outside of the case 1. It is possible to bleed the yarn membrane module.

As described above, in this embodiment, since the air vent member 5 is formed of the crepe-shaped hydrophobic porous sheet 4, the wrinkles 14 are secured as the passage portion 10 through which air passes even if the air vent member 5 is crushed by water pressure. be able to. Therefore, it is possible to prevent the passage portion 10 from being completely closed without providing the air-permeable spacer 15 in the passage portion 10 as in the conventional example. In this embodiment, both hydrophobic porous sheets 4 have a crepe shape, but only one hydrophobic porous sheet 4 may have a crepe shape.

5 (a) and 5 (b) are partial sectional views of the air vent member 5 used in another embodiment of the present invention.
Spacers 8 are partially arranged inside the passage portion 10 of the air bleeding member 5, and the ends of the spacers 8 reach the openings of the passage portion 10. The spacer 8 is made of rubber, plastic, or the like having higher rigidity than the hydrophobic porous sheet 4, and is hard to be deformed by water pressure.

When water flows into the case 1 of the hollow fiber membrane module having the air vent member 5 as shown in FIG.
As shown in (b), the air vent member 5 is crushed by water pressure, but at this time, since the spacer 8 is interposed between the inner surfaces of the passage portion 10 which face each other, the inner surfaces of the passage portion 10 which face each other do not adhere to each other. Thus, the space where the inner surfaces of the adjacent spacers 8 do not adhere to each other can be secured as the passage portion 10. Then, the air contained as bubbles in the water is introduced into the passage portion 10 through the membrane surface of the air vent member 5 and the air is discharged from the opening of the passage portion 10 to the outside of the case 1. Thus, the hollow fiber membrane module The air can be removed.

As described above, in this embodiment, since the spacer 8 is provided on the inner surface of the passage portion 10, even if the air bleeding member 5 is crushed by the water pressure, the spacer 8 is interposed between the opposing inner surfaces of the passage portion 10. It is possible to prevent the inner surfaces of the passage portions 10 from completely adhering to each other, and to secure the portion where the inner surfaces do not adhere to each other as the passage portion 10 through which air passes. Further, since the spacer 8 is partially provided in the passage portion 10, it may be deformed by water pressure to exert pressure on the adhesive portion 11 and the joint portion 12 like the breathable spacer 15 as in the conventional example. Therefore, the air vent member 5 can be prevented from being damaged.

6 (a) and 6 (b) are partial sectional views of the air vent member 5 used in one embodiment of the present invention. The air bleeding member 5 is formed of a wide hydrophobic porous sheet 4a and a narrow hydrophobic porous sheet 4b, and one surface 20a of the two facing surfaces 20a, 20b of the passage portion 10 is covered. Length along the width, that is, one side 2
The length of the surface 0a is longer than the length of the other surface 20b in the width direction, that is, the length of the other surface 20b.

When water flows into the case 1 of the hollow fiber membrane module having the air vent member 5 as shown in FIG.
As shown in (b), the air vent member 5 is crushed by the water pressure, but at this time, one surface 20a is distorted and comes into contact with the other surface 20b, so that the inner surfaces facing each other of the passage portion 10 are completely adhered. This can be avoided, and a portion where the inner surface of the passage portion 10 does not adhere is secured as a void. Then, the air contained in the water as bubbles is introduced into the passage portion 10 through the membrane surface of the air vent member 5 and the air goes out of the case 1 through the opening of the passage portion 10. The module can be deflated.

As described above, in this embodiment, the length of the slope of the one surface 20a of the facing surface of the passage portion 10 is made equal to the other surface 20b.
Since it is formed longer than the length of the slope, the one surface 20a is distorted and comes into contact with the other surface 20b even if the air vent member 5 is crushed by the pressure of water flowing in the case 1, and It is possible to prevent the inner surfaces of the portions 10 facing each other from completely adhering to each other, and to prevent the passage portion 10 from being completely closed.

[0039]

As described above, in the hollow membrane module according to the first aspect of the present invention, since a large number of irregularities are formed on the inner surface of the passage portion, the irregularities can be interposed between the opposing inner surfaces of the passage portion. When the air vent member is crushed by the pressure of the water flowing in the case, it is possible to prevent the inner surfaces of the passage portions from contacting each other even if the passage portion is not provided with a spacer. It is not necessary to use a spacer, and it is possible to prevent the air vent member from being damaged by the deformation of the spacer.

Further, in the hollow membrane module according to the second aspect of the present invention, since at least one of the concave groove and the ridge extending to the opening of the passage portion is formed on the inner surface of the passage portion, the hollow membrane module is provided between the opposing inner surfaces of the passage portion. Grooves or ridges can be interposed so that when the air vent member is crushed by the pressure of the water flowing in the case, the inner surfaces of the passages will not come into close contact with each other even if no spacer is provided in the passages. Therefore, it is not necessary to use a spacer as in the conventional example described above, and the air vent member can be prevented from being damaged by the deformation of the spacer.

Further, in the hollow membrane module according to claim 3 of the present invention, since the air vent member is formed of the crepe-shaped hydrophobic porous sheet, it is formed in the hydrophobic porous sheet between the inner surfaces facing each other of the passage portion. Wrinkles can be interposed, and when the air vent member is crushed by the pressure of the water flowing in the case, it is possible to prevent the inner surfaces of the passage portions from sticking to each other without providing a spacer in the passage portion. Therefore, it is not necessary to use a spacer as in the above-mentioned conventional example, and the air vent member can be prevented from being damaged by the deformation of the spacer.

Further, in the hollow membrane module according to the fourth aspect of the present invention, since the spacer is partially provided inside the passage portion, the spacer can be interposed between the inner surfaces facing each other of the passage portion, and the inside of the case can be provided. When the air bleeding member is crushed by the pressure of the water flowing through it, it is possible to prevent the inner surfaces of the passages from sticking to each other, and by partially providing the spacers inside the passages, the spacers are deformed by the water pressure. However, the pressure can be prevented from being applied to the joint portion between the hydrophobic porous sheets, and the air vent member can be prevented from being damaged by the deformation of the spacer.

According to a fifth aspect of the present invention, in the hollow membrane module, of the two facing surfaces of the passage portion, the length in the width direction along one surface is the width along the other surface. Since it is formed longer than the length in the direction, even if the air bleeding member is crushed by the pressure of the water flowing in the case, the longer surface is distorted, and even if the spacer is not provided in the passage part, the inner surface facing the passage part is opposed. It is possible to prevent them from completely adhering to each other, so that it is not necessary to use a spacer as in the above-mentioned conventional example, and it is possible to prevent the air vent member from being damaged by the deformation of the spacer.

[Brief description of drawings]

FIG. 1A is a sectional view showing a part of an air vent member used in an embodiment of the present invention, and FIG. 1B is a partial sectional view showing a state where the air vent member is crushed.

FIG. 2A is a partially exploded perspective view showing an air vent member used in another embodiment of the present invention, and FIG. 2B is a partial sectional view showing the air vent member in a crushed state. .

FIG. 3 (a) is a sectional view showing a part of an air vent member used in still another embodiment of the present invention, and FIG. 3 (b) is a partial sectional view showing a state where the air vent member is crushed.

FIG. 4 (a) is a sectional view showing a part of an air vent member used in still another embodiment of the present invention, and FIG. 4 (b) is a partial sectional view showing a state where the air vent member is crushed.

5A is a sectional view showing a part of an air vent member used in still another embodiment of the present invention, and FIG. 5B is a partial sectional view showing a state where the air vent member is crushed.

FIG. 6 (a) is a sectional view showing a part of an air vent member used in still another embodiment of the present invention, and FIG. 6 (b) is a partial sectional view showing a state where the air vent member is crushed.

FIG. 7 is a partially broken perspective view showing an example of the present invention and a conventional example.

FIG. 8 is a cross-sectional view of an air vent member used in a conventional hollow fiber membrane module.

[Explanation of symbols]

 1 Case 2 Potting Material 3 Hollow Fiber Membrane 4 Hydrophobic Porous Sheet 5 Air Venting Member 6 Concavo-convex 7 Recessed Groove 8 Spacer 9 Convex Strip 10 Passage 20a Surface 20b Surface

Claims (5)

[Claims] 1. A hydrophobic porous sheet in which one opening of a tubular case is closed by a potting material, the hollow fiber membrane is housed in the case, and the end of the hollow fiber membrane is opened on the outer surface of the potting material. Create an air vent member in the shape of a bag to form a passage part inside, store the air vent member in the case, open the passage part of the air vent member on the outer surface of the potting material, and insert it into the case from the other opening of the case. In the hollow fiber membrane module in which the air contained in the inflowing water is introduced into the passage part of the air vent member through the hydrophobic porous sheet and the air is discharged from the opening of the passage part to the outside of the case, A hollow fiber membrane module comprising a large number of irregularities. 2. A hydrophobic porous sheet in which one opening of a cylindrical case is closed with a potting material, the hollow fiber membrane is housed in the case, and the end of the hollow fiber membrane is opened on the outer surface of the potting material. Create an air vent member in the shape of a bag to form a passage part inside, store the air vent member in the case, open the passage part of the air vent member on the outer surface of the potting material, and insert it into the case from the other opening of the case. In the hollow fiber membrane module in which the air contained in the inflowing water is introduced into the passage part of the air vent member through the hydrophobic porous sheet and the air is discharged from the opening of the passage part to the outside of the case, A hollow fiber membrane module comprising at least one of a groove and a ridge extending to an opening of a passage portion. 3. A hydrophobic porous sheet in which one opening of a cylindrical case is closed by a potting material, the hollow fiber membrane is housed in the case, and the end of the hollow fiber membrane is opened on the outer surface of the potting material. Create an air vent member in the shape of a bag to form a passage part inside, store the air vent member in the case, open the passage part of the air vent member on the outer surface of the potting material, and insert it into the case from the other opening of the case. In a hollow fiber membrane module in which the air contained in the inflowing water is introduced into the passage part of the air vent member through the hydrophobic porous sheet and the air is discharged from the opening of the passage part to the outside of the case, a crepe-like hydrophobic property A hollow fiber membrane module comprising an air vent member formed of a porous sheet. 4. A hydrophobic porous sheet in which one opening of a cylindrical case is closed by a potting material, the hollow fiber membrane is housed in the case, and the end of the hollow fiber membrane is opened on the outer surface of the potting material. Create an air vent member in the shape of a bag to form a passage part inside, store the air vent member in the case, open the passage part of the air vent member on the outer surface of the potting material, and insert it into the case from the other opening of the case. In the hollow fiber membrane module in which the air contained in the inflowing water is introduced into the passage part of the air vent member through the hydrophobic porous sheet and the air is discharged from the opening of the passage part to the outside of the case, A hollow fiber membrane module characterized in that spacers are partially provided. 5. A hydrophobic porous sheet in which one opening of a cylindrical case is closed with a potting material, the hollow fiber membrane is housed in the case, and the end of the hollow fiber membrane is opened on the outer surface of the potting material. Create an air vent member in the shape of a bag to form a passage part inside, store the air vent member in the case, open the passage part of the air vent member on the outer surface of the potting material, and insert it into the case from the other opening of the case. In the hollow fiber membrane module in which the air contained in the inflowing water is introduced into the passage portion of the air vent member through the hydrophobic porous sheet and the air is discharged from the opening of the passage portion to the outside of the case, the passage portions are opposed to each other. A hollow fiber membrane module, characterized in that, of the two surfaces, the length in the width direction along the surface of one surface is longer than the length in the width direction along the surface of the other surface.