JPS5924652B2 - "Filtration" device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a type of filtration device that introduces pressurized gas into a filtration tank to discharge residual liquid remaining in the tank when filtration is completed.

In a conventional filtration device of this kind, a series of door plates are stacked horizontally and set in a filtration tank, and the undiluted solution introduced into the filtration tank from the inlet pipe of the undiluted solution enters the filtration chamber of each door plate.
The liquid is filtered by passing through a door plate provided on the perforated plate, and the filtered liquid passes through the outlet hole of the inner ring of the door plate and passes through the central passage defined by each inner ring. and is discharged from the outlet pipe at the bottom of the tank.

Since the tank is still full of liquid even after clearing is completed, pressurized gas is introduced from the gas introduction pipe installed at the top of the tank, and the remaining liquid treatment plate located under the outlet pipe and the bottom door plate is filled with pressurized gas. Residual liquid is quickly drained from the attached drain pipe.

However, in the conventional structure, the outlet pipe at the bottom of the tank can communicate with the pressurized gas above the liquid level of the residual liquid through the central passage and the inner 1 m1 outlet hole, so that the discharge process of the residual liquid does not progress. When the liquid level drops, the outlet hole in the inner ring of the upper door panel becomes higher than the liquid level, and a part of the pressurized gas flows through the outlet hole and the passage in the inner ring to the p-filter outlet pipe. Also from outside.

It will be done.

The amount of pressurized gas leaking increases as the liquid level decreases,
Therefore, the force with which the pressurized gas presses against the liquid surface is reduced.

Therefore, conventional equipment uses a door plate other than the residual liquid processing plate,
Moreover, even if a pressurized air body was introduced, it took time to discharge the residual liquid, and the residual liquid could not be treated efficiently.

An object of the present invention is to provide a filtration device that prevents the pressurized gas introduced into the E-filtration tank from leaking, thereby allowing residual liquid to be discharged in a short period of time.

In order to achieve the above object, the filtration device according to the present invention is characterized in that a series of furnace plates stacked in a tank is divided into an upper group and a lower group, and the filtrate is filtered through the furnace plates of each group. is discharged from a separate outlet pipe through a divided passage, and when filtration is completed, the valves of the outlet pipes are sequentially closed as the residual liquid level drops, thereby preventing pressurized gas from leaking. That's what I did.

Next, the present invention will be explained with reference to the drawings.

The figure shows an embodiment of a filtration device according to the present invention, in which 1 is a filtration tank, a residual liquid treatment plate 2 is attached to the bottom of the tank 1, and a residual liquid treatment plate 2 is installed in the tank. A series of hearth plates are stacked horizontally on top.

One of these oven plates is a partition oven plate 11, and the oven plate is divided into a group of the partition oven plate 11 and the oven plates 12 below it, and a group of oven plates 13 above the partition door plate. .

Preferably, the partition furnace plate 11 is placed approximately in the center of the series of F plates.

On the side of the tank 1 is an inlet pipe 3 for introducing the stock solution to be filtered.
A pressurized gas introduction pipe 4 is provided at the top of the tank.

As shown in the figure, the residual liquid processing plate 2 is provided with a discharge pipe 5 for discharging the accumulated liquid thereon.

As shown in an enlarged view in FIG. 2, each furnace plate includes a furnace plate member 10 extending in the radial direction, and an inner circumferential ring 1 on the inner periphery of the center thereof.
4. Consists of a perforated plate 16 provided on the external wall part 15 and the furnace plate member 10, and a P material 11 on the perforated plate 16,
An introduction hole 15 for the stock solution is formed in the outer cylinder side part 15.
In addition, a filtrate outlet hole 14 is formed in the inner circumferential ring 14 .

A vertical passage 20 is formed in the center by each inner circumferential groove 14 of the series of F plates, and the top of the passage 20 is closed by a closing plate 18.

In addition, as shown in FIG. 1, the top of the inner circumferential ring of the partition furnace plate 11 is divided into halves divided by diameter, and the passage 20 formed by the 1 m1 ring 14 in the group of furnace plates 12 below is closed in the longitudinal direction. The top of one passage section 21 is sealed by the closed inner ring section of the partition plate 11, and the other passage section 22 is separated by the passage 20 of the upper group of oven plates 13. is connected to.

These divided passage sections 21,22 are connected to separate outlet pipes 23 or 24, to which outlet pipe 23 is fitted a valve 25 and to outlet pipe 24 a valve 26.

A valve 21 is also attached to the discharge pipe 5.

Note that 28 is a pressure gauge.

Although not shown in the figure, a sealing material such as an O-IJ tank is placed on the mutual contact surfaces between the stacked furnace plates to maintain airtightness therebetween.

The partition plate 19 is preferably constituted by a partition wall 19' on the diameter of the inner peripheral ring 14 of each furnace plate 12, as shown in the drawing.

In addition, in each upper furnace plate 13, an appropriate number of lead-out holes 14' can be provided at arbitrary positions on the inner peripheral ring 14, but for example, in the third
As shown in the figure, the inner II IJ tank can be installed at equal intervals on all sides, but on the partition door plate 11 and each lower furnace plate 12, the fourth
As shown in the figure, the outlet hole 14' is formed in a portion of the inner IJ ring 14 on the side that communicates with the passage portion 21 whose top is closed, that is, in a portion of the inner IJ ring on the side that defines the passage portion 21.

During operation, the stock solution introduced into the filtration tank 1 from the inlet pipe 3 passes through the inlet holes 15' in the furnace plates to the respective furnace plates 11, 12, 13.
is fed into the filtration chamber and filtered through the furnace material 17.

The liquid filtered from each upper furnace plate 13 passes through a passage 20, a passage section 22 below it, and is discharged through an outlet pipe 24.

On the other hand, the filtrate from the partition furnace plate 11 and each lower furnace plate 12 passes through the passage section 21 and is discharged from the outlet pipe 23.

When the filtration is completed, the valve of the inlet pipe 3 is closed.

At that time, the tank 1 is filled with the undiluted solution, but the inlet pipe 4
Pressurized gas such as air is introduced into the tank to push down the liquid level.

In this case, in this filtration device, residual liquid treatment is performed in three stages depending on the position of the liquid level.

First, when the liquid level is above the level a of the uppermost F plate, the three valves 25, 26, and 27 are opened to discharge the filtrate from all furnace plates.

Next, if the liquid level is lower than level a and higher than level b of partition furnace plate 11, valve 26 is closed and valve 2 is closed.
5 and 27 are opened to discharge the filtrate from the outlet pipe 23 and the discharge pipe 5.

It should be noted that it is easy to know from the pressure gauge 28 that the rL plane has fallen below level a, since the atmospheric pressure suddenly drops when it falls below that level.

Furthermore, when the liquid level falls below level b, valve 25 as well as valve 26 are closed, only valve 27 is opened, and the discharge pipe 5 is closed.
Drain the filtrate from the chisel.

In this way, depending on the position of the liquid level of the remaining liquid, the valve is closed in stages, so the pressurized gas above the liquid level is prevented from flowing out from the outlet pipes 24 and 23, and pressure is constantly applied above the liquid level. This makes it possible to quickly process residual liquid.

Although each valve can be operated manually as described above, a drop in the liquid level is automatically detected using an appropriate gas pressure sensing device or level switch, and the valves are automatically opened and closed accordingly. Needless to say, automatic operation is possible.

Therefore, according to the present invention, the residual liquid in the filtration tank can be treated using the residual liquid treatment plate and other door plates,
Moreover, since leakage of the pressurized gas is prevented, the residual liquid treatment time can be significantly shortened, and the residual liquid treatment can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view somewhat schematically showing a filtration device according to an example of the present invention, and FIG. 2 is a partial sectional view showing an enlarged view of one of the door panels included in the filtration device. Figure 3 is an enlarged sectional view taken along line A-A in Figure 1;
FIG. 4 is an enlarged cross-sectional view taken along line B--B of FIG. In the figure, 1 is a filtration tank, 2 is a residual liquid processing plate, 3 is an inlet pipe,
4 is a pressurized gas introduction pipe, 11, 12.13 is a door plate, 14 is an inner ring, 20 is a passage, 11 is a partition door plate, 12 is a door plate in the lower group, 13 is a door plate in the upper group, 21 is one side 22 is the other passage portion, 23.24 is the outlet pipe, 2
5.26 is the valve, 14' is the extraction drying

Claims (1)

[Scope of Claims] 1. A filter comprising a filtration tank, a residual liquid processing plate provided at the bottom of the tank, and a series of filter plates stacked on the residual liquid processing plate in the tank, and each of the filter plates has a A vertical passage is formed in the center by the inner circumferential ring, the top of said passage is closed, and an inlet pipe for stock solution is attached to the side of the tank, and an inlet pipe for pressurized gas is attached to the top, and each filter is A filtration device in which the liquid filtered by the plate is led out to the central passage through a lead-out hole formed in an inner peripheral ring of the filter plate,
One of the series of filter plates is a partition filter plate, and is divided into a lower filter plate group including the partition filter plate and an upper filter plate group, and among the lower filter plate group) IIJ The passageway through the filter plate is divided by a longitudinal partition plate, one part of which is sealed at the top by the partition plate and which receives all the filtrate of the lower plate group. The outlet hole is formed in the inner Fm1J part of the side defining the one part of the passage, and the other part of the passage communicates with the passage of the upper filter plate group, and A filtration device characterized in that each lower end of said passageway is connected to a separate outlet pipe, each provided with a valve. 2. In the filtration device according to claim 1, the partition plate of the lower filter plate group is formed by a partition wall on the diameter of the inner peripheral ring of each filter plate belonging to the lower filter plate group. The filtration device consists of: 3. The filtration device according to claim 1, wherein the partition filter plate is located approximately at the center of the series of filter plates.