JPS5948128B2 - filter plate - Google Patents

Description

[Detailed description of the invention] The present invention relates to a filter plate used for pressure filtration.

Conventionally, in this type of filter plate, as shown in FIG.
Liquid passage holes 2A, 2B are provided in the center of each, and liquid guide means such as liquid guide grooves 3A, 3B, 3C are formed on the inner surface of the plate-shaped body IA, the IC, and both sides of the plate-shaped body 1B. forced,
Furthermore, surrounding frames 4A, 4B, 4C are attached to plate-like bodies IA, IB, and IC.
is surrounded by surrounding frame 4A.

The lower edges of 4B and 4C have filtrate discharge holes 5A and 5B.

5C is provided.

In order to perform pressure filtration in this way, the filter plates 10A and IOC are arranged at both ends, a plurality of filter plates 10B are arranged in the middle, they are superposed, fixed by applying an appropriate pressing force to both ends, and the pressure waver is installed. At this time, filter cloths 6A, 6B, and 6C are sandwiched between each of the filter plates 10A, IOB, and IOC.

Thus, a filter chamber 10' is formed in the pressure filter and the pump 7
The liquid to be treated is passed from the press-in path 8 to the filter plate 1 along the arrow.
If the liquid is press-fitted into the liquid passage hole 2A of 0A, the liquid to be treated will flow through the filter plate 10B,
Filter cloth 6A along the arrow through the liquid passage hole 2B of the IOC,
6B, 6C, that is, the inside of the filter chamber 10' is filled with filter cloth 6A.
, 6B, 6C.

Thus, the filtrate flows through each filter plate 10A, IO as shown by the arrow.
B. The filtrate is discharged from the filtrate discharge holes 5A, 5B, and 5C via the liquid guide grooves 3A, 3B, and 3C of the IOC.

As the solid content contained in the liquid to be treated accumulates inside the filter cloths 6A, 6B, and 6C, the filtration pressure increases, and the filtration process ends when a predetermined pressure is reached.

Thereafter, a pressurized gas such as air or nitrogen gas is forced into the filter plate 10A to compress and dehydrate the solid content deposited in the filter cloths 6A, 6B, and 6C.

However, in this case, the width of the filter chamber 10' is substantially uniform, and the density of the solids deposited inside the filter cloths 6A, 6B, and 6C is approximately uniform, so that the solid content in the pressure filter is The pressurized gas selectively flows upward in the filter chamber 10' due to buoyancy.

Thus, in the filter chamber 10', the filter cloths 6A, 6B,
Only the upper half of the solid content deposited inside 6C is selectively compressed and dehydrated, and the lower half is hardly dehydrated.

The purpose of the present invention is to improve the above-mentioned conventional drawbacks and uniformly dehydrate the solid content deposited inside the filter chamber. Provide a liquid hole,
The gist is that a filtrate discharge hole is provided in the peripheral edge, a filtrate discharge hole is provided in the peripheral edge, and the plate thickness on one side from the center is made larger than on the other side.

; The present invention will be described with reference to an embodiment shown in FIG. 2 and below. In a set of filter plates 20A, 20B, 20C,
The plate-like bodies 11A and IIB each have a liquid passage hole 12A in the center.
.

12B, and liquid guide grooves 30A, 30B are provided on the inner surface of the liquid material 11A, IIC and both surfaces of the plate-like material 11B.
A thick plate 13 on which a liquid guiding means such as 30C is formed, and the lower half of each plate is provided with a liquid guiding means by making it porous, for example.
A, 13B, and 13C are stretched, and the plate-shaped body 11
A.

11B, IIC has surrounding frames 14A, 14B, 14C
are surrounded, and further plate-like bodies 11A, IIB, IIC
A liquid collection hole 15A, 1 for collecting and discharging filtrate is provided at the lower peripheral edge of the 1
5B, 15C are provided, and liquid collection holes 15A, 15B,
15C has a liquid guiding groove 30A.

Guide holes 17A, 17B, 1 leading to 30B, 30C
7C will contact you.

Note that the liquid collecting hole 15C is a blind hole. The above filter plate 20A, 2
In 0B, 20C, plate-like bodies 11A, IIB, I
The plate thickness from the center of the IC to the bottom is 13A, 13B,
13C, it is larger than the upper plate thickness.

The filter plates 20A and 20C are arranged at both ends to form a plurality of filters.

The plate 20B is arranged in the middle for polymerization, and the liquid collection holes 15A, 15 are formed.
B.

15C are attached to each other and fixed by applying an appropriate pressing force to both ends to form a pressure wave device. At this time, each filter plate 20A,
Between 20B and 20C are filter cloths 16A, 16B, 1
6C is held between the two.

Thus, a filter plate 0' is formed in the pressure filter, but the filter chamber 2
0'A is regulated to be wide, and lower part 20'B is regulated to be narrow.

In the pressure wave filter having the above configuration, if the liquid to be treated is forced into the liquid passage hole 12A of the filter plate 20A from the press-in path 19 along the arrow by the pump 18, the liquid to be treated will be transferred to the filter plate 20B.

Filter cloth 16A, 1 along the arrow through the liquid passage hole 12B of
6B, 16C is filled with filter cloths 16A, 16B,
Filter plates 20A, 20B in which 16C has liquid guiding grooves 30A, 30B, 30C.

20C surface and porous planks 13A, 13B,
Filtration pressure is generated by being regulated by the surface of 13C.

It is filtered through filter cloths 16A, 16B, and 16C.

Thus, the filtrate is filter cloth 16A, 16B, t6c.
The lower half of the liquid flows down through the porous thick plates 13B and 13C along the guide grooves 30A, 30B and 30C to the guide hole 17A.

Liquid collection hole 15A along the arrow via 17B, 17C,
The liquid flows into 15B and 15C and is discharged from the outlet of the liquid collection hole 15A as shown by the arrow.

In such a filtration process, the narrow lower portion 20'B of the filter chamber 20' is first filled with the solid content C of the liquid to be treated.

At this point, the upper part 2 of the filter chamber 20' is restricted to a wide width.
0'A is still not completely filled with solids, leaving a gap E.

This state is shown in FIG. When the collation 1520'B is filled with the solid content C, the filtration pressure increases rapidly and the filtration rate decreases rapidly, so at this point the filtration process is stopped and the residual liquid discharge path 19A is branched from the press-in path 19. When opened, there is a gap in the upper part 20'A, and liquid passage holes 12A, 12.
The liquid to be treated remaining in B is removed from the discharge path 19A.

Next, the discharge path 19A is closed and the branch pipe 19 of the press-in path 19 is closed.
B is opened and pressurized gas such as air or nitrogen is forced into the pressure filter through the liquid passage hole 12A.

The pressurized gas injected into the pressure filter enters the filter plate 0' through the gap E to squeeze out the solids deposited in the upper part 20'A and the solids filling the lower part 20'B. Dehydrate.

. In this way, the solid content C deposited in the upper part 20'A is compressed uniformly by the pressure gas through the gap E, so that the dewatering efficiency is improved and the dewatering rate is reduced by the solid content C deposited in the lower part 20'B. Thus, a substantially uniform solids dewatering rate can be obtained throughout the pressure waver.

After the dehydration process is completed, the polymerized filter plates 2OA and 20B
, remove the pressing force exerted on both ends of the filter plate 20
A, 20B and 20C are separated, and the filter cloth 16A,
The solid content accumulated in 16B and 16C is taken out.

L The present invention is not limited to the above embodiments.

For example, as shown in FIG. 5, in order to make the lower half of the plate 11B of the filter plate 20B thicker than the upper half, the plate 11B
Only one side of the lower half may be bulged, or the portion surrounded by the peripheral frame 14B, that is, the wave surface may be circular as shown in FIG.

As described above, in the present invention, the thickness of one side from the center of the plate-shaped body provided with the liquid passage hole in the center is larger than that of the other side, so the filter plate can be formed by polymerizing. The width of the filtration chamber is narrower on one side than the other side from the center, so even when the narrowly regulated portion of the filtration chamber is filled with the liquid to be processed during the filtration process, the filtration chamber is narrower than the other side. In the wide regulated part of the chamber, gaps are created between the accumulated solids, and if the filtration process is stopped at this point and the remaining liquid to be treated is discharged, pressurized gas can be applied to the wide regulated part. In this case, the pressurized gas squeezes the solid content through the gap, and a substantially uniform dewatering rate of the solid content is obtained over the entire pressure waver.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional filter plate in a superposed state; Fig. 2 and the following show an embodiment of the present invention; Fig. 2 is a front view, Fig. 3 is a side sectional view of a superposed state; 5 is a side sectional view of a filter chamber portion, FIG. 5 is a side sectional view of another embodiment of the filter plate, and FIG. 6 is a plan view of still another embodiment of the filter plate. In the figure, IIA, IIB, IIC...Plate body, 12A, 12B...Liquid hole, 15A, 1
5B, 15C...Liquid collection hole, 20A, 20B
, 20C...Filter plate, 20'...Filter chamber, 20'A...Wide part, 20'B...
・Narrow part.

Claims (1)

[Claims] A plate-like body with a liquid guide means on its surface has a liquid passage hole in the center, a filtrate discharge hole in the peripheral part, and the plate thickness on one side from the center is larger than on the other side. A filter plate characterized by: