JPS6279809A - Filter - Google Patents

Abstract

PURPOSE:To easily wash away the dust at the bottom part of a hollow yarn membrane during backwashing by supporting and fixing the end part of a bundle of hollow yarns in a casing, placing the hollow yarn in the recessed part of a filter cartridge packed with activated carbon and protecting the hollow yarn with the contour of the cartridge. CONSTITUTION:The end part 9a of the hollow yarn is inserted into a holding frame 10 and fixed with a synthetic resin. The obtained hollow yarn membrane filter is screwed into the rib 12 of a lid 3. The lid 3 is put on the upper part of the main body 1 and firmly attached so that a hollow yarn 9 is placed in the recessed part of the filter cartridge 5 packed with activated carbon 6 and wherein the recessed part is formed at the central part. When the hollow yarn is backwashed, the lid 3 is opened, the cartridge is released, the holding frame is released from the lid 3 and fitted into a rib 13 to direct the opening at the end face of the hollow yarn toward the water inlet side and then the lid 3 is put on the main body 1. Under such conditions, untreated water is supplied in the same way as in the ordinary operation and the dust deposited on the surface of the hollow yarn 9 is removed by the water current and discharged to the outside of the filter.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a filter for filtering drinking water or the like using a hollow fiber membrane.

2. Description of the Related Art Recently, hollow fiber membranes made up of bundles of hollow fibers having numerous micropores have come to be used as filter media for filtering drinking water and the like.

A conventional filter will be explained below based on the drawings.

In Fig. 3, 30 is the filter body (hereinafter referred to as the main body)
, 31 is a filtration cartridge containing activated carbon as a filter medium, and 32 is a hollow fiber constituting a hollow fiber membrane. Hollow fiber 3
2 has countless micropores on its wall, and is bent and bundled into a U-shape. The end portion 33 of each hollow fiber 32 is hardened with synthetic resin or the like and fixed to the inside of the cover 34.

In other words, a hollow fiber membrane is a type of filter that filters water by passing water through micropores on the wall of the hollow fiber. During filtration, water permeates through the wall from the outside of the hollow fiber and enters the inside of the hollow fiber. and flows out through the opening at the end of the hollow fiber. On the other hand, by applying water pressure from the opposite direction, water that has entered through the openings at the ends of the hollow fibers flows out through the micropores in the wall surface. At this time, the dust adhering to the hollow fiber surface is washed away and flows out.

One end 35 of the cover 34 and an annular rib 37 provided on the lid 36 are threaded, and the cover 34 is fixed to the lid 36 side with screws. The other end 38 is also threaded so that the cover 34 can be reversed and attached to the lid 36 as shown in FIG.

Filtration with this filter is performed by passing water along the arrows shown in FIG. In other words, from the raw water supplied from the water supply pipe, residual chlorine etc. are removed by activated carbon, and turbid components such as iron rust and general bacteria are removed by the hollow fiber membrane formed by bundling the hollow fibers 32, resulting in filtered water. Outflow pipe 3
Discharge from 9.

If this filter is used for a long time, the filtration performance of the hollow fiber membrane composed of activated carbon and hollow fiber membrane will decrease. Activated carbon cannot be regenerated and must be discarded, but hollow fiber membranes can be regenerated by backwashing. Conventionally, the other end 38 of the cover 34 was attached to the lid 36 as shown in FIG. 4, and backwashing was performed by passing water through the hollow fiber membrane in the opposite direction as shown by the arrow. Then, minute dust etc. adhering to the outside of the hollow fiber membrane were removed.

Problems to be Solved by the Invention However, in the above configuration, the hollow fibers 32 are tightly bundled and packed inside the cover 34, so when backwashing the hollow fiber membrane, there is no need to clean the outside of the hollow fibers 32. Although it is possible to easily wash away dishes that have adhered to the facing area,
Regarding dust adhering to the vicinity of the base of the hollow fibers 32 fixed by synthetic resin, the bundled hollow fibers 32 have increased resistance to water, making it difficult to completely wash away the adhering dust. there were.

The present invention solves the above-mentioned problems, and aims to provide a filter that can easily wash away dust attached to the roots of hollow fiber membranes during backwashing of the hollow fiber membranes.

Means for Solving the Problems In order to achieve the above object, the present invention uses a hollow fiber holding member as a frame body, the ends of the bundled hollow fibers are fixed to the frame body, and activated carbon is enclosed as a filter medium. The hollow fibers are housed in the recesses of the filter agent cartridge, and the hollow fibers are protected by the outer shell of the filter cartridge.

Effect: With the above configuration, the hollow fibers can be protected by the outer shell of the filtration agent cartridge during filtration, and when backwashing the hollow fiber membrane, the hollow fibers can be exposed by removing the filtration agent cartridge. Therefore, the flow of backwash water becomes smooth especially at the root side fixed to the frame of the hollow fiber, and dust adhering to the vicinity of the root portion can be easily washed away.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. 1st
In the figure, 1 is a filter body (hereinafter referred to as the main body), 2 is a water supply pipe connected to the bottom of the main body 1, and this water supply pipe 2
The other end is connected to the water faucet. 3 is a lid that is attached to the upper part of the main body 1 by a screw structure and seals the inside of the main body 1, and 4 is a filtrate water outflow pipe connected to M3. Reference numeral 5 denotes a filter cartridge which is housed in the main body 1 and encloses activated carbon 6 as a filter medium. Reference numeral 7 denotes a hole provided in the outer shell of the filter cartridge 5 for entering raw water. A recess is formed in the central part of the cartridge 5, and a hole 8 through which filtered water flows out is provided in the outer shell of the filter agent cartridge 5 facing the four parts. 9 is a hollow fiber constituting the hollow fiber membrane, and 10 is a holding frame that holds the hollow fiber 9.

In this embodiment, the hollow fiber membrane is constructed almost in the same manner as in the conventional example using hollow fibers similar to those in the conventional example. However, in this embodiment, the ends 9a of the hollow fibers 9 are inserted into the holding frame 10 and fixed to the holding frame 10 with synthetic resin.

A screw is cut into the outer peripheral part 11 of the holding frame 10, and the holding frame 10
is fitted with a screw cut into a rib 12 provided around the filtered water outlet of the lid 3, and is attached with a gasket (not shown) in between to prevent water from leaking. Furthermore, ribs 13 similar to the ribs 12 are provided around the raw water inlet at the bottom of the main body 1 so that the holding frame 10 can be connected thereto. The cartridge 5 is housed in the main body 1 and is supported and positioned by ribs 14 provided at the bottom of the main body 1.

Holding frame 10. The hollow fiber membrane filter including the hollow fibers 9 is first screwed into the ribs 12 provided on the lid 3 and fixed. The lid 3 is placed over the top of the main body 1 so that the hollow fibers 9 fit into the recesses of the cartridge 5 already accommodated in the main body 1. At this time, the bundled hollow fibers 9 fit into the recess of the cartridge 5, are wrapped around the side wall 15 of the recess of the cartridge 5, and are protected by the outer shell of the cartridge 5.

By rotating the lid 3, the cartridge 5 and the holding frame 10 are securely brought into close contact with each other with a gasket (not shown) in between. A gasket is also interposed between M3 and main body 1 to prevent internal water from leaking to the outside.

Filtration in this embodiment is carried out, as in the conventional example, by passing water through the activated carbon 6 and the hollow fiber membrane along the arrows shown in FIG.

Next, the procedure for backwashing the hollow fiber membrane will be explained. First of all,
The lid 3 is opened, the activated carbon cartridge 5 is removed, and the holding frame 10 is further removed from the lid 3. Then, attach the holding frame 10 to the rib 13 on the bottom of the main body 1 so that the end opening 16 of the hollow fiber 9 faces the water inlet side as shown in FIG. 2, and then attach the lid 3 to the main body 1 again. When raw water is supplied as in normal use, water enters the hollow fiber 9 through the end opening 16 of the hollow fiber 9, penetrates through the micropores in the wall, and flows out to the outside. Dust attached to the surface of the thread 9 is removed and flows out of the filter.

At this time, since the bundle of hollow fibers 9 is exposed to the outside, and each of the hollow fibers 9 can be easily expanded outwardly by the pressure of the water flowing out from inside the hollow fibers 9, it is especially difficult to bundle the hollow fibers 9. At the root portion 9a of the hollow fiber 9, resistance to water flowing out from inside the hollow fiber 9 is reduced, and dust attached to the root portion of the hollow fiber 9 is also easily removed. In addition, hollow fiber 9
By spreading outward, relatively large dust particles caught between each hollow fiber 9 can be easily removed.

In this embodiment, since the outer shell of the cartridge 5 serves as a cover to protect the hollow fibers 9, there is no fear that the hollow fibers 9 will be damaged when the cartridge 5 and the holding frame 1O are fitted together. When backwashing the hollow fiber membrane, simply removing the holding frame 10 from the cartridge 5 exposes the hollow fibers 9 to the outside.

Effects of the Invention As described above, the present invention fixes the ends of bundled hollow fibers to a frame body, and accommodates the hollow fibers in the recesses of a filtration cartridge in which activated carbon is sealed as a filter medium. By configuring it to protect the hollow fibers,
When the filtration cartridge is removed during backwashing of hollow fiber membranes, the hollow fibers are exposed, allowing water flowing out from within the hollow fibers to flow smoothly, especially at the base of the hollow fibers.
Dust attached to the base can be easily washed away.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a filter according to an embodiment of the present invention divided in the vertical direction, Fig. 2 is a sectional view showing the state of the filter during backwashing, and Fig. 3 is a sectional view of a conventional filter in the vertical direction. FIG. 4 is a sectional view showing the state of the filter during backwashing. 11. Filter body 26. Water supply pipe 3.5 lid
40. Filtered water outflow pipe 58. Filtration application cartridge 90. Hollow fiber 101. Holding frame

Claims (1)

[Claims] A hollow fiber membrane filter comprising a bundle of hollow fibers having micropores provided in the side wall and holding the hollow fibers with a frame so that water flows between the openings in the end face of the hollow fibers and the micropores; A filtration cartridge in which a recess for accommodating the hollow fiber is formed, a water outlet is provided in the outer shell facing the recess, a water inlet is provided in the outer shell of another part, and activated carbon is sealed inside as a filter medium;
It has a filter main body that accommodates the hollow fiber membrane filter and the filtration cartridge, and the frame body is configured to accommodate the hollow fiber in the recess of the filtration cartridge. A filtration system characterized in that a hollow fiber membrane filter and the above-mentioned filtration cartridge are combined so as to be in close contact with the outer periphery of the above-mentioned concave portion without water leakage, and housed in the above-mentioned filter main body so as to partition between an outlet and an inlet of water. vessel.