JPS6238008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a filter plate for a single filter press.

Prior Art This type of filter plate consists of a substrate and an elastic material for squeezing, such as rubber, which is placed over at least one side of the substrate and has a filtering surface on its surface. After completion of filtration, a pressure fluid is introduced between the substrate and the free part of the elastic body to expand the free part of the elastic body into the filtration chamber, thereby further squeezing the cake (filter slag) after filtration. It is.

However, since there is a gap around the stock solution supply port between adjacent filter plates for introducing the stock solution into the filtration chamber, when the cake is squeezed by pressure fluid, the unfiltered stock solution flows back through this gap. As a result, the throughput of press filtration is reduced, and a portion of the fluid pressure escapes through the gap, making it impossible to perform uniform press filtration. Furthermore, the elastic body stretches locally and deforms abnormally, causing it to enter the gap, causing the abnormally deformed part of the elastic body and the filter cloth covering it to tear, making it impossible to carry out press filtration work. There was a problem in that the elastic body and filter cloth had to be repaired or replaced frequently.

Purpose of the Invention The purpose of the present invention is to solve the above problems, to reliably prevent abnormal deformation of the elastic body even if the filtration pressure is increased during press filtration, and to prevent damage to the elastic body and filter cloth. Therefore, it is possible to carry out press filtration work extremely efficiently, and there is very little need for repair and replacement of the elastic body and filter cloth, and the throughput is large.
To provide a press filter plate for a single filter press capable of uniform press filtration.

Composition of the Invention In order to achieve the above-mentioned object, the present invention covers at least one side of a substrate with a compression elastic body,
A fixed edge of the elastic body around the raw solution supply port is covered with an elastic body abnormal deformation prevention member that extends toward the free portion of the elastic body and has a bendable overhang portion having a substantially annular hard reinforcing portion at the tip. When the free part of the elastic body is swollen by the pressure fluid, the overhanging part having the hard reinforcing part is bent together with the free part, and this overhanging part causes the area around the stock solution supply port between adjacent filter plates to be bent. The gist is a compressed filter plate of a single filter press whose gaps are closed.

Embodiments Next, embodiments of the present invention will be described based on the drawings.

In FIG. 1, the pressing filter plate 1 is composed of a substrate 2 and a pressing elastic body 3 made of a rubber plate, and has a stock solution supply port 4 in the center and filtrate outlets 5, 5 in the upper right corner and lower left corner. Alongside this, filtrate collection ports 6, 6 are provided inwardly, and a compressed fluid inlet 7 for compressed air or the like is provided in the lower right corner. The filtrate outlets 5,5 and the filtrate collection ports 6,6 are communicated by filtrate passages 8,8.

In FIG. 2, there is a through hole 9 in the center of the substrate 2.
is bored, and annular recesses 10 are provided on both sides of the through hole 9, respectively. Through holes 11, 11 connected to the through holes 9 of the substrate 2 are formed in the centers of both the elastic bodies 3, 3, respectively, and these through holes 9, 11, 11 connect the stock solution supply port 4.
is formed. Elastic body 3 around the undiluted solution supply port 4
The fixed edges 3a, 3a respectively protrude inward and are fitted into annular recesses 10, 10 on both sides of the substrate 2, respectively. These fixed edges 3a, 3
Annular recesses 12, 12 are provided in a, respectively.

Fixed edge 3 of the elastic body 3, 3 around the periphery of the stock solution supply port 4
Rubber annular elastic body abnormal deformation prevention members 13, 1 provided with bendable projecting portions 14, 14 extending toward the free portions 3b, 3b of the elastic bodies 3, 3 on a, 3a.
3 is covered. Abnormal deformation prevention member 1
Annular protrusions 16, 16 are provided on the peripheries of the through holes 15, 15, respectively.
7 and 17 are embedded, and circular recesses 20 and 20 in which the heads of bolts 18 or nuts 19 are accommodated are bored at predetermined intervals on the outer surface of the same, and fixed edges 3a of elastic bodies 3 and 3 are inserted. , 3a and the annular protrusions 16, 16 of the abnormal deformation prevention members 13, 13 are tightly fastened together with a bolt 18 and a nut 19 with the substrate 2 in between. Abnormal deformation prevention member 13,1
A hard reinforcing portion 22 made of an annular metal fitting is embedded in the tips of the overhanging portions 14, 14 of No. 3.

Here, as a material for the abnormal deformation prevention member 13, a material that has greater hardness than the elastic body 3, is bendable, and has restorability is used. For example, the hardness of the rubber constituting the compression elastic body 3 is about 60° according to the Japanese Industrial Standards (JIS) hardness tester, but the hardness of the rubber constituting the elastic body abnormal deformation prevention member 13 is about 60°. Preferably, the angle is about 70° to 80° when measured with a testing machine. Such abnormal deformation prevention material 13 made of rubber may be appropriately reinforced by embedding cloth or other reinforcing material therein, or may be made of an equivalent substance such as synthetic resin such as polypropylene resin in addition to rubber. You may use something.

The peripheral edge of the stock solution supply port 4 is covered with an annular thin rubber cover 23 having a substantially U-shaped cross section. At the periphery of the stock solution supply port 4 between the compressed filter plate 1 and the ordinary filter plate 21 adjacent thereto, there is a gap 2 for introducing the stock solution into the filtration chamber 24 in the middle of both filter plates 1 and 21.
5 is open.

In the above, after the compressed filter plate 1 and the ordinary filter plate 21 are superposed and the normal filtration is completed, a pressurized fluid such as compressed air is introduced between the substrate 2 of the compressed filter plate 1 and the free part 3b of the elastic body 3. When the free part 3b is expanded and the cake in the filtration chamber 24 is squeezed, the tip of the elastic body abnormal deformation prevention member 13 is removed together with the free part 3b of the elastic body 3, as shown by the two-dot chain line in FIG. The overhanging part 14 having an annular hard reinforcing part 22 is bent, and the tip of the overhanging part 14 faces the ordinary filter plate 2.
1, a gap 25 around the stock solution supply port 4 between adjacent filter plates 1 and 21 is closed by the overhang 14. At this time, the annular hard reinforcement part 22
Since it is hard, its size does not change and maintains its original size, and only the projecting portion 14 expands to close the gap 25. In addition, the hard reinforcement part 22
, the overhang 14 never enters the gap 25. Such an overhang part 1
4 acts like a check valve, it is possible to suppress local elongation of the free portion 3b of the elastic body 3, and prevent abnormal deformation of the elastic body 3 and the filter cloth 26 due to abnormal deformation. Damage can be prevented.

In the above embodiment, the hard reinforcing part 22 made of an annular metal fitting is embedded in the tip of the overhanging part 14 of the elastic body abnormal deformation prevention member 13, but the hard reinforcing part 22 is not limited to this. A hard reinforcing part made of a ring made of synthetic resin may be embedded, or an annular reinforcing part made of hard rubber may be integrally provided at the tip of the overhanging part 14 made of soft rubber. Accordingly, a hard reinforcing portion may be formed. Further, such hard reinforcing portion 22 does not need to be completely annular, but may be approximately annular with one or more discontinuous portions. The illustrated abnormal deformation prevention members 13, 13 are held down by bolts 18 and nuts 19 on both sides of the compressed filter plate 1, but the abnormal deformation prevention members 13, 13 are not limited to this, By pressing filter plate 1
It may be fixed to .

Further, in the above embodiment, the compressed filter plate 1 is shown in which both sides of the substrate 2 are covered with the elastic bodies 3, 3, but in this invention, the compressed filter plate 1 is The same applies to filter plates.

Effects of the Invention As described above, the compression filter plate of the single filter press according to the present invention extends from the fixed edge 3a of the elastic body 3 around the periphery of the stock solution supply port 4 toward the free portion 3b of the elastic body 3, and has approximately the tip thereof. When the elastic body abnormal deformation prevention member 13 equipped with the bendable overhanging part 14 having the annular hard reinforcing part 22 is fitted and the free part 3b of the elastic body 3 is bulged by the pressure fluid, the free part 3b At the same time, the overhanging portion 14 having the hard reinforcing portion 22 is bent so that the overhanging portion 14 closes the gap 25 around the stock solution supply port 4 between adjacent filter plates 1 and 21. Since a substantially annular hard reinforcing part 22 is provided at the tip of the overhanging part 14, it is completely impossible for the hard reinforcing part 22 to pass through the gap 25 during squeeze filtration, and therefore the filtration pressure is reduced. It is possible to reliably prevent abnormal deformation of the elastic body 3 even if it increases significantly, and damage to the elastic body 3 and the filter cloth 26 can be prevented, and therefore the press filtration work can be carried out extremely efficiently. In addition, the number of repairs and replacements of the elastic body 3 and the filter cloth 26 can be minimized. Furthermore, since the gap 25 is closed by the overhanging portion 14 of the elastic body abnormal deformation prevention member 13,
The unfiltered stock solution in the filtration chamber 24 is not pushed back into the stock solution supply port 4, so that the throughput is increased and uniform compression filtration can be performed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of the product of the present invention, and FIG. 2 is an enlarged sectional view taken along the line of FIG. 1. 1... Squeezing filter plate, 2... Substrate, 3... Elastic body for squeezing,
3a... Fixed edge portion, 3b... Free portion, 4... Stock solution supply port, 13... Elastic body abnormal deformation prevention member, 14... Overhanging portion, 21... Ordinary filter plate, 22... Hard reinforcing portion, 25
...Gap, 26...Filter cloth.

Claims (1)

[Claims] 1 A compression elastic body 3 is placed on at least one side of the substrate 2, and a substantially annular hard reinforcement is provided on the fixed edge 3a of the elastic body 3 around the periphery of the stock solution supply port 4, extending toward the free portion 3b of the elastic body 3 and at the tip. Elastic body abnormal deformation prevention member 1 provided with a bendable overhang portion 14 having a portion 22
3 is covered and the free part 3b of the elastic body 3 is bulged by the pressure fluid, the overhanging part 14 having the hard reinforcing part 22 is bent together with the free part 3b, and the adjacent overhanging part 14 is bent. A compressed filter plate for a single filter press, in which a gap 25 around the stock solution supply port 4 between the filter plates 1 and 21 is closed.