JPS6010655Y2 - filtration device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a filtration device for filtering a liquid containing foreign matter, and more particularly to a filtration device that performs a stable filtration action until the entire filter element is completely filled with foreign matter.

In the past, various filter elements have been proposed and put into practical use for filtering liquids such as oil or water containing foreign substances. Clogging was the biggest problem.

In order to solve this problem of filter element clogging, and to allow filtering for a relatively long period of time without clogging, filter elements made of paper stacked in layers or wound in a roll have been proposed in recent years. be.

In such a filter element, the gap between the layers of paper is used as a filtrate passage, and the foreign matter contained in the stock solution flowing through the passage is attached to the fibers of the paper by Brownian motion, and is separated and removed.

However, even with such a filter element, if a large amount of foreign matter adheres to the area near the inflow end of the stock solution, it becomes clogged and filtration becomes impossible even if the area near the outflow end is free of foreign matter. It became.

Therefore, even with such a layered filter element, it is difficult to fully utilize the entire element, and when the paper expands and contracts due to the influence of humidity, wrinkles occur in the element, and these wrinkles become a leak path for the stock solution. Poor filtration was occurring.

Furthermore, if the filtration pressure applied to the filter element becomes abnormally high, this pressure may cause the filter element to wrinkle and form a leak passage, or the thin part of the filter element may break and a leak passage may be formed, as described above. There was poor filtration.

In order to prevent the occurrence of leak passages due to such an increase in filtration pressure, it is sufficient to maintain the filter element in a pressurized state, but in this case, the Brownian motion of foreign substances in the liquid may be prevented. There was a drawback that the filtration efficiency deteriorated because the filtrate passed through the filter element without sufficient filtration.

This device eliminates various problems seen in conventional filtration devices.It does not cause clogging for an extremely long period of time, regardless of pressure or non-pressure, until the entire filter element is completely filled with foreign matter. The purpose is to provide a filtration device that can stably and efficiently perform filtration, and will be described in detail below with reference to illustrated embodiments.

In the figure, reference numeral 1 denotes a pressure-resistant case formed into a cylindrical shape with a bottom, in which a stock solution supply pipe 2 is connected near the upper end of the side wall, a filtrate outlet pipe 3 is connected to the center of the bottom wall, and a lid is attached to the opening edge. 4
is secured by tightening bolt 5 in a fluid-tight manner.

6 is a cassette case which has a stock solution supply lower in the center of the upper surface and a filtrate outlet 8 in the center of the bottom, and is placed inside the pressure-resistant case 1, and is connected to the bottom of the lid 4 and the cassette case. A spring 9 is stretched between the upper surface of the case 6 and the lower surface of the cassette case 6 is brought into pressure contact with the bottom surface of the pressure-resistant case 1.

By inserting a filter paper 10 between the bottom surface of the pressure case 1 and the bottom surface of the cassette case 6, the filtration action is performed between the two at the beginning of the filter head. I try to seal the space between the filter paper 1
3 may be replaced with a rubber gasket or the like.

Furthermore, although the cassette case 6 is made of, for example, an aluminum can, the peripheral wall of the case 6 may be made of cardboard or the like to facilitate incineration and disposal after use.

Furthermore, it is not necessary to prepare a stock solution supply lower on the top surface of the cassette case 6 in advance, and when setting the cassette case 6 in the pressure-resistant case 1, the tongue piece 11 with a handle provided on the top surface of the case 6 is removed. The filtrate outlet 8 may be opened in the same manner as the stock solution supply lower.

Reference numeral 12 denotes a filter element provided within the cassette case 6, and is composed of an aggregate of short fiber pulp that has been dehydrated with oil.

The pulp constituting this filter element 12 may be one that has not yet been made into paper, but it may also be one that has been made into dust paper.

In the latter case, it goes without saying that the paper must be loosened and washed with water to remove the glue.

Specifically, pulp obtained from waste paper such as newspapers and magazines is thoroughly dried and ground using a suitable grinder to form short fibers.

The length of the fiber at this time is not particularly limited, but the shorter the better.

The pulp that has been crushed into short fibers is heated to 110°C to 120°C.
'C! immersed in oil and dehydrated.

Then, the fibers return to their original shape and take on a cylindrical shape penetrating back and forth, having flexibility and forming a filter element.

13 is a packing made of a laminate of polymerized filter paper on the lower surface of the filter element 12;
A filtrate passageway 14 is formed between the outer circumferential surface of the filter element 12 and the inner circumferential surface of the cassette case 6, and a filtrate passageway 14 is formed at the center of the filter element 12 and the packing 13 at the bottom of the cassette case 6. By forming the filtrate passage 15 continuous to the outlet 8, the concentrate supplied from the concentrate supply pipe 2 into the pressure resistant case 1 flows into the concentrate passage 14 from the concentrate supply lower of the cassette case 6, and the filter element 12 is The filtrate flows toward the filtrate passage 15 and flows out from the filtrate passage 15 through the filtrate outlet 8 and the filtrate outlet pipe 3 to the outside of the apparatus.

The filtrate passage 15 extends upward from the lower end of the filter element 12 and terminates midway through the filter element 12 without passing through it upward.

Reference numeral 16 denotes a filtration material that covers the inner and outer circumferential surfaces and the upper surface of the filter element 12 and the outer circumferential surface of the packing 13, and is made of a material with high liquid permeability and flexibility, such as cloth or paper. , the filter element 12 is kept in shape, and the element 12 and the packing 13 are integrated.

On the upper surface of the filter element 12 provided in the cassette case 6 in this way, a pressure receiving plate 17 is placed which descends in response to the pressure of the stock solution supplied into the stock solution passage 14. A shape retaining material 18 made of a filter paper or the like wound into a roll is inserted, and the aW passage 15 into which this shape retaining material 18 is inserted and the stock solution passage 14 formed on the outer periphery of the filter element 12 are Each filler material 19 having a filtering function, such as cloth or paper, is filled to prevent the filter element 12 from melting and collapsing.

It is sufficient that the pressure receiving plate 17 is placed on the upper surface of the filter element 12, and does not need to be fixed.

Since the present invention is constructed as described above, the stock solution supplied from the stock solution supply pipe 2 into the pressure resistant case 1 flows into the stock solution passage 14 via the stock solution supply lower.

The stock solution that has flowed into the stock solution passage 14 flows into the filtrate passage 15 via the filter element 12 .

As the stock solution flows through, foreign matter contained in the stock solution is removed not only from the outer surface of each pulp constituting the filter element 12 but also from the entire surface including the inner surface or end surface of the pulp. Ru.

Therefore, the area of the filter element 12 that is resistant to adhesion and removal of foreign matter becomes extremely large, and the filtration capacity is significantly increased compared to conventional filter elements.

Moreover, since the filter element 12 is made of an aggregate of dehydrated short fiber pulp, and the pulp is oriented in any direction, the flow rate of the stock solution flowing through the filter element 12 is reduced. be done.

Therefore, there is no risk that foreign matter adhering to the pulp will be washed out by the raw solution (filtrate) flowing through the filter element.

In addition, 1. When the pressure of the stock solution supplied into the stock solution passage 14 is high and the chaotic force applied to the filter elements I to 12 is high, the pressure receiving plate 17 is lowered by this pressure and the filter element 12 is Since the pulp is compressed, the density of the pulp constituting the filter element 12 increases.

Therefore, the flow resistance of the stock solution becomes high, and the flow speed of the stock solution is kept constant.

That is, as the pressure of the stock solution loaded on the filter element 12 increases, the amount of descent of the pressure receiving plate 17 increases, increasing the degree of compression of the filter element 12, so that even when the pressure of the stock solution fluctuates, the filter element The flow rate of the stock solution passing through 12 can be made constant, and a predetermined filtration performance can be maintained.

Furthermore, when the filter element 12 is compressed as described above, it is possible to prevent the filter element 12 from being damaged by the high-pressure stock solution, so there is no risk of forming a leak passage like in conventional filtration devices. Since the shape retaining material 18 is inserted into the a7U passage 15 that is about to be crushed, there is no risk that this passage 15 will be crushed.
The filtrate can flow out smoothly.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the filtration device of this invention, Fig. 2 is a klttJf+ side view of the filter element and cassette,
FIG. 3 is an exploded perspective view of the filter element. 1... Pressure resistant case, 2... Stock solution supply pipe, 3... Filtrate extraction pipe, 6... Cassette case, 7... Stock solution Supply port, 8...
Stock solution outlet, 12...Puff, filter element, 13...Packing, 14...Stock solution passage, 15...Stock solution passage, 16... ...Government attachment, 17...Pressure plate, 18...Shape retaining material.

Claims (1)

[Scope of utility model registration request] In a filtration device, a pressure-receiving plate 17 is placed on the top surface of a filter element 12 made of a pulp aggregate of short fibers dehydrated with oil, which compresses the filter element in response to the pressure of the raw solution passage 14. A cassette case 6 in which a raw solution supply lower and a filtrate outlet 8 are formed is housed in a removable manner, and the filter element 12 and pressure receiving plate 17 are mounted inside the cassette case 6, and the outer peripheral surface is connected to the raw solution passage 14. A filtrate passage 15 that terminates without penetrating the filter element is formed from the lower end on the inner peripheral part of the filter element 12 facing the filter element 12, and the inner and outer peripheral surfaces of the filter element 12 are covered with a highly flexible filtration material 16. In addition, a shape retaining material 18 formed by winding a filter paper inside the filtrate passage 15 on the inner circumference of the filter element 12
A filtration device characterized by having a.