JPS6019017A - Filter element used in backwashing type filter apparatus - Google Patents

Abstract

PURPOSE:To remove fine foreign matters by enabling effective backwashing, by applying flocking to a part or the entire surface of a filter element formed by winding a wire material in a coil form. CONSTITUTION:Flocking (a) is applied to the entire surface of a coil shaped wire material for forming a filter element 13. Flocking (a) is performed by allowing fine fibers each cut into a predetermined length to adhere to the surface of the wire material by an electrostatic flocking machine. The fiber may be either one of a synthetic fiber and a natural fiber. A flocking region may be limited to the surface opposed to the adjacent wire material, that is, surfaces between which filtering gaps are formed. When filtering capacity is lowered, the filter element 13 is extended to widen the gaps between the wire material segments and a large amount of backwashing water is passed through said gaps to enable effective washing of foreign matters.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filtration element used in a backwash type filtration device, and more specifically, a coil type filtration element in which both ends are pulled during backwashing to forcibly widen the filtration gap. This element is made up of wire rods whose surface is flocked with hair to filter extremely fine dust.

First, an example of a backwash type filtration device using a coiled filtration element, which is a premise of the present invention, will be described based on FIGS. 1 and 2.

In FIG. 1, ■ indicates a main container, which in this example has a substantially cylindrical shape. This cylindrical main body container 1
A horizontal first partition wall 2 is located approximately in the middle of the interior in the vertical direction.
A horizontal second partition wall 3 is provided at a position further down from the first partition wall 2. Due to these first partition wall 2 and second partition wall 3, the inside of main body container 1 includes a drain chamber 6 surrounded by second partition wall 3, bottom wall 4 of container 1, and container side wall 5, and second partition wall 3 and first partition wall. The container is divided into three spaces: a lower first chamber 7 surrounded by the container 2 and the container side wall 5, and an upper second chamber 9 surrounded by the first partition 2, the ceiling plate 8 of the container 1, and the container side wall 5. . Said No.-
The chamber 7 leads to an inlet 10 provided on the side of the container l, while said second chamber 9 leads to an outlet 11 provided in the container side wall opposite said inlet 10.

A plurality of through holes 12 are formed in the first partition wall 2 at regular intervals on a circumference whose center coincides with the central axis of the container 1. In the figure, reference numeral 13 indicates a filtering element, which is formed by winding a wire into a coil and having a cylindrical shape as a whole. This filtration element 13 has its lower end 13a fitted and fixed into each of the through holes 12, and its upper end 13b fixed to the reciprocating member 15 of the reciprocating means 14 provided on the ceiling 8 of the container 1. It is arranged within the second chamber 9. As the reciprocating means 14,
In this example, an air cylinder is used.

When the reciprocating member 15 of the reciprocating means 14 moves downward, as shown on the right side of FIG. 1, the filter elements 13 are compressed so that adjacent wire rods form a constant filtering gap with each other.

This state is the filtering state of the filter element 13.

On the other hand, when the reciprocating portion 15 moves upward, the filtration element 13 is stretched by a certain amount, as shown on the left side of FIG. It will be done. This state is the backwash state of the filter element 13. In addition, in the figure, the code 16... is
In order to prevent the filtration element 13 from shifting in the lateral direction at the intermediate portion thereof, a plurality of guide bars are shown extending between the first partition wall 2 and the ceiling of the container 1 along its circumference.

On the upper surface of the second partition wall 3, the plurality of through holes 12...
A plurality of backwash nozzles 17 are provided so as to face the filtration element 13 whose lower end is fitted and fixed thereto in the upper and lower direction. The backwash nozzle 17... has a lower part communicating with the drain chamber 6, and a base end member 17a... fixed to the second partition wall 3.
The tip member 17b is fitted onto the outer surface of the tip member 17b so as to be able to slide a certain distance in the vertical direction. Further, the distal end members 17b...
A compression coil spring 19 interposed between the lower part of the partition wall 3 and the second partition wall 3 is elastically biased upward when the main body is in use. The outer diameter of the upper end of the tip member 17b is set to be slightly larger than the inner diameter of the through hole 12, and when the tip member 17b is moving upward, the outer diameter of the upper end of the tip . . , to break the communication between the first chamber 7 and the second chamber 9. In this example, the outer periphery of the upper end of the tip member 17b is formed like a cone-shaped valve, and this is a valve seat formed by rounding the edge of the lower opening of the through hole 12. It should be in close contact with the

On the other hand, inside each filter element 13, there is a push rod 20 that reciprocates in the vertical direction in conjunction with the reciprocating member 15.
is installed. A cone-shaped valve 21 is formed at the lower end of this push rod 20, and when it moves downward, the nozzle opening 2 of the backwash nozzle 17 opens as shown on the right side of FIG.
At the same time as blocking 2, the tip of this backwash nozzle 17 +J
' 17b is pushed down against the elasticity of the compression coil spring 19. This state is the state of the backwash nozzle 17 in the filtration state. As is clear from the figure, while the nozzle port 22 of the nozzle 17 is closed, the flow path for raw water from the first chamber 7 to the filtered niremen 1 to 13 via the through holes 12 is secured. .

In the example shown in the drawings, the upper part of the push rod 20 is
In order to make the length of the reciprocating movement in the vertical direction and the length of the vertical movement of the upper end of the filter element 13 different, the following configuration is particularly adopted.

That is, as shown in the upper part of FIG. 1, the cylindrical shaft-shaped member 23 to which the two ends of the filtration element 13 are fixed is fitted onto the outer periphery of the push rod 20 so as to be slidable up and down. By interposing a compression coil spring 25 between this member 23 and a collar 24 formed on the push rod 20, the member 23 is elastically urged downward. That is, the filtration element 13 is not compressed directly by the reciprocating member 15, but is configured to be compressed via the compression coil spring 25. By doing this, the filter element 13
Even after the compression coil spring 25 has been compressed by a predetermined amount, the compression coil spring 25 can be further compressed.
You can move up even further. Such a configuration is effective when it is not necessary to widen the filtration gap of the filtration element during backwashing.

The operation of the backwash type filtration device shown in Figures 1 and 2 is as follows:
It is as follows.

During normal filtration, all filter elements 13
The backwash nozzle 17 is in a filtration state as shown on the right side of FIG. In this state, the raw water that has flowed into the first chamber 7 from the inlet 10 flows into each filtration element 13 through each through hole 12, and then passes through the filtration gap formed by each adjacent wire of the element. and flows into the second chamber 9. The raw water is filtered at this time. The filtered water in the second chamber 9 is discharged from the container 1 through the outlet 11.

On the other hand, when it becomes necessary to clean the filter element 13, the reciprocating member 15 of the reciprocating means 14 is moved upward to bring the filter element 13 or the backwash nozzle 17 into a backwash state as shown on the left side of FIG. At this time, the tip of the backwash nozzle 17 comes into contact with the through hole 12 . . . , disconnects the second chamber 7 from the second chamber 9 and at the same time connects the second chamber 9 to the drain chamber 6 . Since the pressure in the drain chamber 6 is overwhelmingly lower than the pressure in the second chamber 9, the filtration water in the second chamber 9 flows through the expanded filtration gap to the filtration element 13, contrary to the above-mentioned filtration state. At this time, the foreign matter adhering to the inner wall of the filter element 13 is washed away at once. In this way, the backwash water containing foreign matter is discarded to the outside of the container 1 via the backwash nozzle 17 or the drain chamber 26.

As mentioned above, in a backwash type filtration device that uses a filtration element made of coiled wire, the space between the wires that make up the element is forcibly expanded during backwashing. The filter element has a special feature in that the backwash water flows vigorously and as desired between the wire rods, which makes it possible to clean the filter element very effectively.

In such a filtration element, both ends of the coil are compressed to create a predetermined gap between adjacent wire rods, thereby forming a filtration gap, but only the ends of the coil are compressed to form the filtration gap. Due to the nature of wire rods, it is almost impossible to maintain a precisely constant gap between adjacent wire rods. This is because errors inevitably occur during the bending process during coil formation, and the bending rigidity also varies slightly at different locations along the length of the wire. Therefore, in such a filter element,
It is not possible to reduce the filtration gap formed between the wire rods beyond a certain level, and therefore, extremely fine dust cannot be filtered, as is the case with filter cloth, for example.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to enable a filtration element formed by winding a wire into a coil to be able to filter out even the most minute dust. It is to do so.

In order to achieve such an objective, the present invention employs the following technical means.

In other words, a part or all of the surface of a filtration element formed by winding a wire into a coil is flocked.

FIG. 3 is a sectional view showing one embodiment of the present invention. As is clear from the figure, in this embodiment, the entire surface of the coiled wire forming the filtration element 13 is covered with flocked a.
is alms. This flocking a can be easily carried out by, for example, adhering fine nylon fibers cut to a predetermined length onto the surface of the wire using an electrostatic flocking machine. Of course, the fine fibers may be made of synthetic fibers other than nylon, wool, or cotton. Further, as a method of flocking, adhesive may be applied to the surface of the wire in advance and the above-mentioned fibers may be sprayed onto the surface of the wire. Furthermore, the part to be flocked may be the entire surface of the wire, or only the surface facing an adjacent wire, that is, the surface sandwiching the filtration gap.

As is clear from the figure, a filtration space in which fine fibers are intertwined is formed in the gap between each wire of the filtration element 13. Foreign substances such as fine scales in the raw water are effectively removed by the fibers serving as a filtering medium when the raw water passes through the gaps.

Additionally, if filtration is continued for a long time, many foreign substances will accumulate in the gaps between the wire rods, reducing the filtration ability of the device.
In this case as well, by stretching the filtration element 13 to widen the space between the wire rods and passing a large amount of backwash water between the expanded wire rods, the above-mentioned foreign substances can be effectively washed. The basic advantages of the filter element are not lost.

FIG. 4 is a sectional view showing another embodiment of the present invention. In this example, appropriate protrusions b... are provided on the surface of the wire in the vertical direction of the element, and when the element is compressed to the maximum, each wire has a certain filtration gap corresponding to the height of the protrusion. The surface of the wire is flocked. This is advantageous because the filtration gap becomes constant and there is no variation in filtration performance at different locations along the length of the element.

It goes without saying that the scope of the present invention is not limited to the embodiments shown in the drawings, and the type of backwash filtration device to which the present invention is to be used does not matter. That is, in addition to the filtration device shown in FIGS. 1 and 2, the present inventor's patent application
The filtration element of the present invention can also be used in the filtration device shown in FIG. 1 of Japanese Patent No. 7-169165. In addition, regarding the winding of the filter element, the above patent application No. 57-16
It may be as shown in FIG. 3, FIG. 8, and FIG. 9 of No. 9165.

As explained above, the filtration element of the present invention stretches both ends during backwashing, expands the space between the wires, and allows backwash water to flow through them vigorously, thereby effectively performing backwashing. It has the remarkable effect of being able to perform the filtration action of a filter cloth, which removes extremely fine foreign matter, while retaining the unique advantage of a coil-wound filtration element.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a backwash type filtration device using the filtration element of the present invention, and FIG.
A line sectional view, FIG. 3 is a sectional view showing an embodiment of the present invention,
FIG. 4 is a sectional view showing another embodiment of the present invention. 13... Filtration element, a '-' ``Flocking applicant Asahi Kikai Seisakusho Co., Ltd. Agent Patent attorney Toyoharu Higuchi Haka 2 0'') 6 Figure 3 Figure 4

Claims (1)

[Claims] (1) A filtration element used in a backwash type filtration device, which is formed by winding a wire into a coil and is characterized by flocking on a part or the entire surface of the filtration element.