JPH08299707A - Filter - Google Patents

Abstract

PURPOSE: To deal with a drain on a sand source, and to surely perform a backward washing operation by providing a filtering function the same as a device using sand as filter media. CONSTITUTION: One end of a core member 8 of the filter media 7 consisting of a raw material bendable and deformable along a longitudinal direction of vegetable fiber or resin fiber is fixed at a proper position of a perforated plate 3 of a mesh plate, etc., constituting a filter media supporting bed in a filter room 1, and a proper number of filter media 7 are housed in a filter room 1. The filter media 7 are composed of the core material 8 and numberless catching yarns 9a..., 9b..., 9c..., attached radially to the core material 8 in the longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device used for filtering water, waste water and other liquids.

[0002]

2. Description of the Related Art Sand, which is a filter medium, is contained in a filter chamber, and water is passed through the sand for filtering.

[0003]

Although sand is generally used as a filter medium for filtering water for use, the deterioration of the water environment in recent years has led to the filtration of raw water in water treatment, filtration after coagulation and sedimentation, or waste water treatment. In the filtration of secondary treated water, sand filtration often causes a large load of suspended solids or suspended solids, resulting in shortened filtration duration, incomplete backwashing, blockage of the filter bed, and other deterioration of the filtration function. ing. Further, there is a demand for a filter device that uses a new filter medium because it cannot keep up with demand due to exhaustion of resources.

[0004]

[Means for Solving the Problems] A core member of a filter medium made of a material such as vegetable fiber or resin fiber that can be bent and deformed in the longitudinal direction at an appropriate position of a perforated plate or the like constituting a filter medium supporting bed of a filtration chamber , An appropriate number of the filter media are housed in the filtration chamber, and the filter media is composed of the core member and innumerable trapping threads radially attached to the core member along the longitudinal direction thereof. In addition to this means, the trapping yarn density is gradually increased from one end of the core member toward the other end, or the trapping yarn density is changed depending on the diameter of the trapping yarn.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show one embodiment of the filtration device according to the present invention. FIG. 1 is a sectional view and FIG. 2 is a perspective view of a filter medium.

In the figure, 1 is a filtration chamber, and the filtration chamber 1 is an inner wall 10 'of the filtration tank 10 and a perforated plate 3 such as a perforated plate which constitutes a filter medium supporting floor and is installed inside the filtration tank 10. The inside of 10 is divided and configured.

The filtration chamber 1 has an inlet 2 and an air vent 4 on the upper side, and an outlet 5 and an outlet 5 on the lower side.
And a cleaning air tube 6 interposed between the porous plate 3 and the perforated plate 3.

FIG. 7 shows a filter medium which is attached to an appropriate place of the perforated plate 3 and is accommodated in the filter chamber 1 in an appropriate number. The filter medium 7 is made of a material which can be bent and deformed in the longitudinal direction. And the catching yarns 9a, 9b, 9c.
b and 9c are attached to the core member 8 in a radial direction from one end thereof to the other end direction (longitudinal direction), and a group of the smallest diameter catching yarns 9a, 9a, ... Is arranged on one end side of the core member 8. As the first filter layer portion 9A, the group of the largest diameters 9c, 9c,
Is disposed on the other end side of the core member 8 as the third filter layer portion 9C, and the second filter layer portion 9B interposed between the first filter layer portion 9A and the third filter layer portion 9C is the catching yarn 9a. Is larger than the catching yarn 9c and smaller in diameter than the catching yarn 9c.

Then, an appropriate number of filter media 7 having the above construction,
The one end side (first filter layer portion A side) of the core member 8 is connected to the perforated plate 3
, 9b ..., 9c ...
The first, second, and third filter layer portions 9A, 9B, and 9C are formed in layers.

The core member 8 is a twisted yarn made of polyester fiber and having a diameter of about 4 mm, and the catching yarn 9a has a yarn diameter of 5 mm.
8 μm, the capturing yarn 9b is 88 μm in diameter, and the capturing yarn 9c is polyester fiber in which the yarn diameter is 124 μm. As the material, nylon, polyvinylidene chloride, other resin fiber or vegetable fiber can be used. Thread 9a,
The yarn diameters of 9b and 9c need not be limited to those in the embodiment.

When untreated water is press-fitted through the injection port 2, the untreated water is supplied to the third filter layer portion 9C and the second filter layer portion 9C.
B and the first filter layer portion 9A are sequentially passed, and the suspended substances or those having a large suspended substance are sequentially filtered, and the treated water is collected through the outlet 5.

When the backwash water is press-fitted from the discharge port 5 side, the core member 8 of the filter medium 7 which is bent and deformed by its own weight.
Since one end side is attached to the porous plate 3, it rises and extends along the flow direction of backwash water, while the catching threads 9a, 9b, 9c also extend in the flow direction of backwash water,
, 9b ..., 9c ... The suspended substances and the like captured by backwashing water are backwashed.

The first to third filter layer portions 9A, 9
B and 9C have different densities of the filter layers 9A, 9B and 9C (capture densities) depending on the yarn diameters of the capture yarns 9a, 9b and 9c.
Are sequentially raised from the upper side (the side of the third filter layer portion 9C), but each filter layer portion may be formed of the same trapping yarn, and the density may be changed by changing the number of trapping yarns.

Of course, the entire area between one end of the core member 8 and the other end thereof may be arranged with the same density with the same catching yarn to form a filter layer.

Although the unfiltered water is made to flow from the upper side to the lower side and the backwash water is made to flow from the lower side to the upper side at the time of backwashing in the filter apparatus of the embodiment, on the contrary, one end of the filter medium is It may be attached to the upper side of the filtration chamber so that untreated water flows from below to above and backwash water flows from above to below.

Of course, the present invention can also be applied to gravity filtration.

[0017]

The present invention has the configuration described above,
It is possible to provide a practical filtration device that can cope with depletion of sand resources and that has the same filtering function as a device that uses sand as a filter medium and that one end of the core member of the filter medium is attached so that the backwashing operation can be performed reliably. .

In addition to this, according to the second aspect of the invention, since the suspended solids and the like are sequentially captured step by step from large ones to small ones, efficient filtering operation and backwashing operation can be performed,
Further, according to the third aspect of the invention, the filtering operation can be performed even more efficiently.

[Brief description of drawings]

FIG. 1 is a sectional view.

FIG. 2 is a perspective view of a filter medium.

[Explanation of symbols]

 1 Filtration Chamber 3 Perforated Plate 7 Filter Material 8 Core Member 9a, 9b, 9c Capture Thread

Claims (3)

[Claims] 1. One end of a core member of a filter medium made of a material such as vegetable fiber or resin fiber that can be bent and deformed in the longitudinal direction is attached to an appropriate position of a perforated plate such as a sieve plate that constitutes a filter medium supporting bed of a filtration chamber. Then, a suitable number of the filter media are housed in the filter chamber, and the filter media are composed of the core member and innumerable trapping threads radially attached to the core member along the longitudinal direction thereof. 2. The filtration device according to claim 1, wherein the density of the captured yarn is gradually increased from one end of the core member toward the other end. 3. The filtration device according to claim 2, wherein the density of the trapping yarn is changed depending on the diameter of the trapping yarn.