JPH07275664A - Hollow yarn membrane module and its production - Google Patents

Abstract

PURPOSE:To provide a module reduced in the lowering of filtering efficiency even when hollow yarn membranes are charged in a high packing ratio and usable for a long period of time by charging hollow yarn membrane bundles in a container in such a state that a water guide pipe is provided in the container to fix the same and allowing the single end of the water guide pipe to communicate with a raw water passage and providing water guide holes to the side surface of the water guide pipe. CONSTITUTION:A water guide pipe 4 made of a resin is inserted into a large number of hollow yarn membrane bundles 2 and the whole is charged in a module case 1. The single end of the water guide pipe 4 is fixed by a resin fixing part 3 and the other end part thereof is opened to be allowed to communicate with a raw water passage. The raw water from the raw water passage is supplied not only to the outer peripheral surfaces of the hollow yarn membrane bundles but also to the inner peripheral surfaces thereof from the water guide holes 5 of the water guide pipe 4. Since raw water penetrates into hollow yarn membranes from both surfaces thereof, a contact area becomes large and the lowering of the filtering efficiency of hollow yarn membranes caused by the accumulation coating with matter to be filtered can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous hollow fiber membrane module for water filtration used in household water purifiers and the like.

[0002]

2. Description of the Related Art Generally, in a hollow fiber membrane module for water filtration, in order to make the amount of the hollow fiber membrane constant, a ridge-shaped or knit-shaped one is bundled and loaded into a container, and the end portion is fixed with resin. After that, the resin fixed end is cut so that the inner hollow portion of the hollow fiber membrane end is opened.

In recent years, there has been a strong tendency toward downsizing, especially for household water purifiers directly connected to the faucet, and there is a demand for a compact hollow fiber membrane module, which is the core of the water purifier. The compactness is achieved by increasing the filling rate of the hollow fiber membranes in the hollow fiber membrane module.

[0004]

In the case of such a hollow fiber membrane module, since the hollow fiber membranes are bundled and used, the object to be filtered is attached to the outer peripheral surface of the hollow fiber membrane bundle as the cumulative use time increases. As a result of deposit coating, the supply of raw water to the inside of the hollow fiber membrane bundle is hindered, resulting in a decrease in filtration efficiency. This tendency becomes stronger as the filling rate of the hollow fiber membrane becomes higher, which is one of the factors that hinders the downsizing of the water purifier.

In view of the above problems, it is an object of the present invention to obtain a hollow fiber membrane module which can be used for a long period of time even when the hollow fiber membrane is loaded at a high filling rate, with little reduction in filtration efficiency. And

[0006]

In the hollow fiber membrane module according to the present invention, a bundle of bundled hollow fiber membranes is loaded and fixed in a container in a state where a water conduit is present, and the water conduit has one end. It is characterized in that it is connected to the raw water passage and has a water guiding hole on the side surface for supplying raw water to the inner peripheral surface of the hollow fiber membrane bundle.

In the method for manufacturing a hollow fiber membrane module according to the present invention, a hollow fiber membrane is bundled and loaded in a container, and a supply pipe for supplying a fixing resin to the inside of the hollow fiber membrane bundle. A water guiding pipe having a water guiding hole on a side surface is inserted into a double pipe having the feeding pipe inside and the water guiding pipe outside, and the feeding pipe is removed after the fixing resin is injected.

In the hollow fiber membrane module according to the present invention, the fed raw water is supplied to the outer peripheral surface of the bundled hollow fiber membrane bundle and, at the same time, passes through the water guiding hole of the water guiding pipe communicating with the raw water passage. It is also supplied to the inner peripheral surface of the hollow fiber membrane bundle formed by inserting the water conduit.

The supplied raw water enters the hollow fiber membrane bundle from the outer peripheral surface of the hollow fiber membrane bundle and also from the inner peripheral surface of the hollow fiber membrane bundle. For this reason, the contact area between the hollow fiber membrane bundle and the raw water is larger than that of the conventional hollow fiber membrane module, and the utilization efficiency of the hollow fiber membrane surface is improved. The decrease in efficiency is reduced, and long-term use is possible.

As the hollow fiber membrane used in the hollow fiber membrane module of the present invention, a hollow fiber membrane of any material generally used for water purifiers such as polyethylene, polypropylene and polysulfone can be used as it is.

The hollow fiber membrane module may be loaded with only the hollow fiber membrane, and may be loaded with an adsorbent such as activated carbon in the same manner as the generally used hollow fiber membrane module. Good.

As the material of the water conduit used in the present invention, it is sufficient that it has water resistance and pressure resistance enough to withstand the pressure applied during water purification, and plastic, metal or the like can be used.

One water conduit may be provided at the center of the bundle of hollow fiber membranes, or a plurality of water conduits may be provided at any desired location. The diameter of the water conduit is not particularly limited as long as raw water can be introduced.

The water guide hole provided on the side surface of the water guide pipe is
This is for supplying the raw water supplied to the water conduit to the inner peripheral surface of the hollow fiber membrane bundle, and can be provided in any shape and in any number within a range in which the raw water can pass. A net-shaped pipe may be used as the water conduit as long as the shape can be maintained.

The resin can be fixed at one end of the water conduit as long as the water conduit can be maintained and fixed in the hollow fiber membrane module. The depth of the water conduit inserted into the resin fixing part is not particularly limited, but it can be fixed to the resin fixing part. If the insertion is too deep, the water conduit may form an opening when the resin fixing portion is cut to open the hollow fiber membrane end.

[0016]

In the hollow fiber membrane module of the present invention, raw water enters the hollow fiber membrane bundle from the outer peripheral surface of the bundled hollow fiber membrane bundle, and at the same time, the raw water is introduced into the water conduit of the water conduit. Since the raw water supplied through the intrusion also enters from the inner peripheral surface of the hollow fiber membrane bundle formed by inserting the water conduit, the contact area between the hollow fiber membrane and the raw water becomes large, and the It is possible to reduce a decrease in filtration efficiency of the thread membrane.

[0017]

EXAMPLES The present invention will be described in detail below with reference to examples. [Embodiment 1] FIG. 1 is a vertical cross-sectional view showing an embodiment of the hollow fiber membrane module according to the present invention, in which a bundle of hollow fiber membranes has one water pipe at the center thereof. In FIG.
Reference numeral 1 is a module case, 2 is a hollow fiber membrane, 3 is a resin fixing portion, 4 is a water pipe, and 5 is a water hole.

As shown in FIG. 1, the hollow fiber membrane module of the present embodiment is provided with a resin water guide tube 4 inserted inside a large number of bundled polyethylene hollow fiber membranes 2. One end of the water conduit 4 is fixed by the resin fixing portion 3,
The other end is open and communicates with the raw water channel.

Raw water introduced from the raw water passage is supplied to the outer peripheral surface of the hollow fiber membrane bundle and, at the same time, supplied to the inner peripheral surface of the hollow fiber membrane bundle from the water guiding hole 5 of the water guiding pipe 4. For this reason,
Since the raw water enters the inside of the hollow fiber membrane bundle from both the outer peripheral surface and the inner peripheral surface of the hollow fiber membrane bundle, the contact area between the hollow fiber membrane and the raw water becomes large, and the hollow fiber due to the deposition coating of the substance to be filtered becomes large. It is possible to reduce a decrease in filtration efficiency of the membrane.

Next, a method for manufacturing the hollow fiber membrane module of the present invention will be described. Generally, in order to make the amount of hollow fiber membranes constant, hollow fiber membrane modules for water filtration are bundled into hollow or knitted hollow fiber membranes and loaded into the module case. , And the hollow fiber membrane and the inner peripheral surface of the module case are hermetically fixed with resin, and then the resin fixing end is cut to open only the inner cavity of each hollow fiber membrane end. ing.

At the time of fixing the resin, in order to efficiently and surely inject the fixing resin solution into only the tip of the hollow fiber membrane which is packed and loaded, the focusing of the hollow fiber membrane is performed by the resin fixing solution. The injection tube is made internal, and the fixing resin is injected from the injection tube with the resin fixing jig attached to the end of the hollow fiber membrane and then withdrawn.

FIG. 3 is an explanatory view of a method for manufacturing a hollow fiber membrane module according to the present invention, which is a vertical sectional view showing a state immediately after the fixing resin is injected. In the method for manufacturing a hollow fiber membrane module of the present invention, when the injection pipe 6 of the fixing resin solution 7 is loaded into the module case 1 while being embedded in the hollow fiber membrane bundle, the injection pipe of the fixing resin solution 7 6 and a water guiding pipe 4 having a water guiding hole 5 on the side surface are loaded as a double pipe with the fixing resin solution injection pipe 6 inside and the water guiding pipe 4 outside.

After that, the fixing resin solution is injected from the supply pipe 6, and only the injection pipe 6 located on the inner surface is removed. Then, after the resin is fixed in this state, the resin fixing portion is horizontally cut so that the end of the hollow fiber membrane bundle is opened, so that the hollow fiber having one end fixed with the resin in the state where the water conduit 4 is present. A membrane module is formed. Therefore, the hollow fiber membrane module of the present invention can be manufactured without any special addition to the conventionally used hollow fiber membrane module manufacturing apparatus.

[Embodiment 2] FIG. 3 is a longitudinal sectional view showing an embodiment of the hollow fiber membrane module of the present invention, in which two water guiding pipes are provided inside the hollow fiber membrane.

[0025]

EFFECT OF THE INVENTION The hollow fiber membrane module of the present invention has a large contact area between the hollow fiber membrane bundle and the raw water, and the filtration efficiency of the hollow fiber membrane due to the deposition coating of the substance to be filtered is less likely to decrease. Even when the packing rate of is improved and the module is made compact, long-term filtration can be performed.

Further, according to the method for manufacturing a hollow fiber membrane module of the present invention, the introduction of the water conduit into the hollow fiber membrane module can be carried out very easily without any special addition to the conventional manufacturing process. You can

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a hollow fiber membrane module of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state immediately after the fixing resin is injected at the time of manufacturing the hollow fiber membrane module of the present invention.

FIG. 3 is a longitudinal sectional view showing an embodiment of the hollow fiber membrane module of the present invention.

[Explanation of symbols]

 1; Module case 2; Hollow fiber membrane 3; Resin fixing part 4; Water guide pipe 5; Water guide hole 6; Injection pipe 7; Fixing resin solution 8; Resin fixing jig

Claims (2)

[Claims] 1. A bundle of hollow fiber membranes bundled in a container is loaded and fixed in a state in which a water guiding pipe is present. The water guiding pipe has one end communicating with a raw water passage and a side surface, A hollow fiber membrane module having a water guide hole for supplying raw water to the inner peripheral surface of the hollow fiber membrane bundle. 2. A hollow fiber membrane is bundled and loaded in a container, and a supply pipe for supplying fixing resin and a water guide pipe having a water guide hole on a side surface are provided inside the hollow fiber membrane bundle. A method for producing a hollow fiber membrane module, characterized in that the supply pipe is inserted into a double pipe having an inner side and the water guiding pipe is outside, and the supply pipe is removed after injecting a fixing resin.