JPS61157313A - Liquid filtering apparatus - Google Patents

Abstract

PURPOSE:To facilitate the handling of a replaceable filter paper body and the mounting thereof to a tank by reducing the receiving space of the replaceable filter body while preventing the interruption of filtering work, by using the filter paper body formed by folding filter paper in a zigzag pattern in place of a filter paper cylinder. CONSTITUTION:Filter paper 1 is folded in a zigzag pattern so as to form the required number of filter paper layers to form a flat plate shaped filter paper body 5 which is, in turn placed along the inner wall surface of a tank 3 wherein a drain port 3a is provided to a surface other than the surface 3b, where the gap of the filter paper body 5 is positioned, while bent in a crescent shape. A liquid to be filtered is passed through the filter paper body 5 from the inner peripheral side thereof to the outer peripheral side thereof to perform filtering and wound up by a wind-up shaft 4 when fine particles are accumulated on the inner peripheral surface to again continue filtering.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a liquid filtration device.

(Prior art and its problems) The present inventor previously proposed the following liquid filtration device. This device is illustrated in cross-sectional views shown in FIGS. 1(a) and 1(b) and
As shown in the cross-sectional view, a filter paper cylinder (2) formed by wrapping a filter paper (1) is placed in a tank (3) equipped with a drain port (3a) on the circumference.
At the same time, when the liquid to be filtered is passed from the inner circumferential surface of the filter paper tube (2) toward the outer circumferential surface of the filter paper tube (2) and particulates are deposited on the inner circumferential surface, the winding provided inside the filter paper tube (2) is Take shaft (
4), it is wound up and filtered again. According to this method, even if fine particles in the liquid pass through the first layer of filter paper, they will be captured by the second layer and even the third layer of filter paper and will not come out to the drain side, making it possible to avoid conventional filtration devices or coagulation sedimentation methods. Higher filtration performance can be obtained compared to water treatment methods such as For example, 30,000 to 50,000 particles per 10cc (0.3 to 1
The number of fine particles per 10 cc of water containing μ) is 100 to 3.
It can be processed until it contains only about 00 particles, and the filtration time is several 100 hours. Therefore, for example, water used specifically for cutting semiconductor substrates in a semiconductor manufacturing factory (=, a large number of cutting chips and harmful In the case of water that contains substances and cannot be drained as is, C2 can be well filtered, and the treated water can be reused, so it has the excellent advantage of saving water.

However, in this case, the filter paper tube (2) can accommodate the winding shaft (4) wrapped around the filter paper tube (2), and at the same time
) must be wound with an inner diameter necessary to form a supply passage for the liquid to be filtered to the inner peripheral surface of the filter. Therefore, the filter paper tube (2
) is large, so a large space is required to store spare parts for replacement. In addition, since it has a cavity with a large inner diameter, it is easily deformed inward by a relatively small external force.
At this time, the strain force may cause the paper to break, making it impossible to wind it up during use and causing interruption of the filtration work. The smaller the difference between the outer circumference and the inner circumference diameter, that is, the thickness, becomes larger.

The present invention has been made to eliminate the above-mentioned drawbacks, and will be described in detail below with reference to the drawings.

[Structure of the Invention] (Means for Solving Problems) The present invention is characterized by the following points. That is, as shown in the perspective view of FIG. 2(a), the filter paper (1) is folded in a zigzag pattern by the required number of filter paper layers to form a flat filter paper body (5), which is then folded in a zigzag manner as shown in FIG. ) While folding it into a half-moon shape as shown in the perspective view of
The drainage port (3a) is located on the surface other than the surface (3b) where the cut is located.
) is placed along the inner wall surface of the tank (3) provided with the filter paper (5), and filtration is performed by passing the liquid to be filtered from the inner circumferential side to the outer circumferential side of the filter paper body (5) as in the conventional case. Also, when fine particles accumulate on the inner circumferential surface, they are wound up by the winding shaft (4),
This is to continue the binding again.

In this case, a non-hardening adhesive sealing material (6) having a viscosity that does not deform due to water pressure, for example, is applied to the overlapped end faces (5a) and both folded end faces (5b) of the filter paper body (5) in the shaded areas in FIG. Apply the coating as shown below, and apply between each filter paper of the filter paper body (5) (:
At the same time as preventing the liquid to be filtered from entering, the winding 1
It is possible to wind up the filter paper (ball) using the spindle (4). In addition, as shown in Figure 3, an adhesive sealing material (6) is applied between the folded ends (5b) and the inner wall of the tank (3) so that the water to be filtered can be directly directed to the drain port (3) of the tank (3). 3a) side, i.e. outer tank (7)
This prevents deterioration of filtration performance and shortening of filtration time.

(Functions and Effects) As described above, in the present invention, the filter paper (5) is formed into a flat plate shape, so that the replacement filter paper (5) can be stacked and stored. Therefore, the storage space can be much reduced compared to conventional filter paper tubes. In addition, like a filter paper tube (: there is no large cavity inside and it will not collapse, the filter paper body (5) is easy to handle and attach to the tank (3), and at the same time,
There is no risk of cutting the filter paper due to crushing.
There is no fear that winding will become impossible and filtration will be interrupted. Also, in the present invention, since it is not circular like a filter paper tube,
The feeding pressure of the liquid to be filtered presses it well against the wall of the tank (3).

Therefore, the adhesive force of the applied adhesive sealing material is sufficient to support the device, and there is an advantage that no special fixing mechanism is required, and the drawbacks of the conventional device described above are completely eliminated.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are a sectional view showing a conventional device and a sectional view taken along line A-A thereof, and FIGS. 2(a), (b) and 3 are perspective views of a filter paper body of the present invention and an example of the device. FIG. (1)...Filter paper, (2)...Filter paper tube, (3
)...Tank, (3a)...Drain port, (3b)
...Wall surface without drainage port, (4) ... Winding shaft,
(5)...Filter paper body, (5a)...° end surface,
(5b)...Folding end surface, (6)...Adhesive sealing material, (7)...Outer tank.

Claims (1)

[Claims] A filter paper tube is provided in a tank having a drainage port, and filtration is performed by flowing the liquid to be filtered from the inner circumferential surface toward the outer circumferential surface of the tank.A winding shaft is provided on the inner circumference of the filter paper tube to carry out filtration. In a liquid filtration device that performs continuous filtration by winding up a contaminated filter paper with a winding shaft when particulates accumulate, a filter paper body formed by folding the filter paper in a zigzag shape is used in place of the above-mentioned filter paper cylinder, and a drainage port is provided at a place other than the cut. A liquid filtration device characterized in that it is installed along the inner wall surface of a tank.