JPS6231963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter plate used for pressure filtration.

Conventionally, in filter plates 10A, 10B, and 10C of this type of filter plate, as shown in FIG.
Liquid guiding means such as liquid guiding grooves 3A, 3B, 3C are formed on the inner surfaces of the plate-like bodies 1A, 1C and on both sides of the plate-like body 1B.
1C is surrounded by peripheral frames 4A, 4B, and 4C, and filtrate discharge holes 5 are provided at the lower edges of the peripheral frames 4A, 4B, and 4C.
A, 5B, and 5C are provided. In order to perform pressure filtration in this way, the filter plates 10A and 10C are arranged at both ends, and a plurality of filter plates 10B are arranged in the middle, polymerized, and fixed by applying an appropriate pressing force to both ends to form a pressure filter. However, at this time, filter cloths 6A, 6B, and 6C are sandwiched between each of the filter plates 10A, 10B, and 10C. In this way, a filter chamber 10' is formed in the pressure filter, and when the pump 7 presses the liquid to be treated from the press-in path 8 into the liquid passage hole 2A of the filter plate 10A along the arrow, the liquid to be treated flows into the filter plate 10B, It fills the inside of the filter cloths 6A, 6B, 6C, that is, the inside of the filter chamber 10' along the arrows through the liquid passage hole 2B of 10C, and is filtered by the filter cloths 6A, 6B, 6C. Thus, the filtrate flows through each filter plate 1 as shown by the arrows.
0A, 10B, 10C filtrate discharge holes 5A, 5
It is discharged from B and 5C. Filter cloth 6A, 6B, 6
As solid content contained in the liquid to be treated accumulates inside C, the filtration pressure increases, and the filtration process ends when a predetermined pressure is reached. After this, the liquid passage hole 2A of the filter plate 10A
Pressurized gas such as air or nitrogen gas is injected into the filter cloth 6.
The solid content deposited in A, 6B, and 6C is squeezed and dehydrated. 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 substantially uniform, so that the solids are press-fitted into the pressure filter. The pressurized gas flows selectively upwardly within the filter chamber 10' due to buoyant forces. In this way, only the upper half of the solid matter deposited inside the filter cloths 6A, 6B, and 6C in the filter chamber 10' is selectively compressed and dehydrated, while the lower half is hardly dehydrated.

The present invention aims to improve the above-mentioned conventional drawbacks, uniformly dehydrate the solid content deposited inside the filter chamber, and easily collect the filtrate. A through hole is provided in the center of the
The gist is that a liquid collecting hole is provided in the peripheral portion, and that both surfaces of the plate-shaped body protrude downward from the center portion more than the upper portion.

The present invention will be described with reference to an embodiment shown in FIG. and plate-shaped body 11A,
Liquid guiding means such as liquid guiding grooves 30A, 30B, 30C are formed on the inner surface of 11C and both sides of the plate-like body 11B, and porous thick plates 13A, 1 are formed in the lower half of each.
3B, 13C are stretched, and further plate-shaped bodies 11A,
11B, 11C have peripheral frames 14A, 14B, 14C
are surrounded, and further plate-like bodies 11A, 11B, 11
A liquid collection hole 15 for collecting and discharging the filtrate is located at the lower peripheral edge of C.
A, 15B, 15C are provided, and liquid collecting holes 15A,
15B, 15C have liquid guide grooves 30A, 30B, 30
Guide holes 17A, 17B, and 17C leading to C communicate with each other. Note that the liquid collecting hole 15C is a blind hole. Above filter plate 2
Plate bodies 11A, 1 at 0A, 20B, 20C
Both sides of the parts 1B and 11C below the central part are made to protrude more than above by the thick plates 13A, 13B and 13C.

The filter plates 20A and 20C are arranged at both ends, and a plurality of filter plates 20B are arranged in the middle, and the liquid collection holes 15
A, 15B, and 15C are attached to each other and fixed by applying an appropriate pressing force to both ends to form a pressure filter. At this time, filter cloths 16A, 16B, and 16C are placed between each filter plate 20A, 20B, and 20C. to hold. In this way, a filter chamber 20' is formed in the pressure filter, but the upper part 20'A of the filter chamber 20' is restricted to be wide, and the lower part 20'A is restricted to a wide width.
0'B is narrowly regulated from both sides.

In the pressure filter having the above configuration, if the liquid to be treated is pressurized into the liquid passage hole 12A of the filter plate 20A from the press-in path 19 along the arrow by the pump 18B, the liquid to be treated passes through the liquid passage hole 12B of the filter plate 20B. The inside of the filter cloths 16A, 16B, 16C is filled along the arrows through the liquid guide grooves 30A, 30.
Filter plate 20A, 20B, 20C with B, 30C
surface and porous planks 13A, 13B, 13
By being regulated by the surface of C, a filtration pressure is generated and filtered by filter cloths 16A, 16B, and 16C. Thus, the filtrate passes through the filter cloths 16A, 16B, 16
The lower half of the board extending from C is a porous thick plate 13A, 13.
Liquid guide grooves 30A, 30B, 30 via B, 13C
The liquid flows down along C and passes through the guide holes 17A, 17B, 17C, and then flows along the arrows to the collection holes 15A, 15B, 15.
C and is discharged from the outlet of the liquid collecting hole 15A as shown by the arrow. In this filtration process, the narrowly restricted lower part 20'B of the filter chamber 20' is first filled with the solid content C of the liquid to be treated. At this time, lower part 2
Since 0'B is narrowly regulated from both sides, the filtration pressure in the lower part 20'B is not uneven but uniform, which is advantageous in terms of filtration efficiency. At this point, the width-limited upper part 20'A of the filter chamber 20' is not yet completely filled with the solid content C, and the gap E
is occurring. This state is shown in FIG. When the lower part 20'B is filled with the solid content C, the filtration pressure increases rapidly and the filtration rate decreases rapidly, so the filtration process is stopped at this point, and the residual liquid discharge path 19A branched from the injection path 19 is opened. When opened, the top 2
The liquid to be treated remaining in the gap 0'A and the liquid passage holes 12A and 12B is removed from the discharge path 19A. Next, the discharge path 19A is closed, and the branch pipe 19B of the press-in path 19 is opened to force a pressurized gas such as air or nitrogen into the pressure filter through the liquid passage hole 12A. The pressurized gas injected into the pressure filter enters the filter chamber 20' through the gap E, and dehydrates the solids deposited in the upper part 20'A and the solids filling the lower part 20'B. do. 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.
The dewatering rate is almost equal to the solid content C deposited in the lower part 20'B, and thus a substantially uniform solid content dewatering rate can be obtained throughout the pressure filter.
After the dehydration process is completed, the polymerized filter plates 20A, 2
The pressing force exerted on both ends of 0B and 20C is removed to separate the filter plates 20A, 20B and 20C, respectively, and the solid content accumulated in the filter cloths 16A, 16B and 16C is taken out.

The present invention is not limited to the above embodiments, but for example, as shown in FIG.
The part surrounded by the peripheral frame 14B, that is, the filter surface, may be circular, and a large number of concentric liquid guide holes 30B and a pair of radial liquid guide holes 30'B may be provided. As shown in FIG. 1, a liquid collection hole 15B may be provided on the peripheral frame 14B, and the filtrate may be guided to the liquid collection hole 15B by a pair of liquid introduction holes 30'B.

Since the present invention has the above-mentioned configuration, the liquid to be treated that is forced into the filter cloth from the liquid passage hole of the plate-like body is filtered by the filter cloth, and the filtrate is collected in the liquid collection hole and discharged from one place. The liquid collection means are thus greatly simplified.

In addition, since both sides of the plate-like body protrude downward from the center of the plate-like body more than above, the filter chamber formed by superposing the filter plates has a width on the lower side from the center than on the upper side. Therefore, even when the narrow part of the filter chamber is filled with solids during the filtration process, there are gaps between the accumulated solids in the wide part of the filter chamber. At this point, if the filtration process is stopped and the remaining liquid to be treated is discharged and then pressure gas is applied, the pressure gas will squeeze the solid content through the gap in the wide regulated area, A substantially uniform solid content dewatering rate can be obtained throughout the pressure filter.

Since the lower part of the filtration chamber is narrowly regulated from both sides, filtration pressure is easily applied evenly, filtration is performed uniformly, and filtration efficiency is positively influenced.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional filter plate in a superposed state, and Fig. 2 and the following show an embodiment of the present invention.
The figure is a front view, FIG. 3 is a side sectional view of the superposed state, FIG. 4 is a side sectional view of the filter chamber portion, FIG. 5 is a front view of another embodiment of the filter plate, and FIG. FIG. 7 is a front view of another embodiment. In the figure, 11A, 11B, 11C... plate-shaped body, 1
2A, 12B...Liquid hole, 15A, 15B, 15
C...Liquid collection hole, 20A, 20B, 20C...Filter plate, 20'...Filter chamber, 20'A...Wide part of the filter chamber, 20'B...Narrow part of the filter chamber.

Claims (1)

[Claims] 1. A plate-shaped body provided with a liquid guiding means on its surface has a liquid passage hole in the center, a liquid collection hole in the peripheral edge, and both sides of the plate-shaped body protrude downward from the center from the upper side. A filter plate characterized by: