JPS5831206B2 - Lokasouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filtration device that can maintain good filtration conditions at all times and can rapidly process stock solutions.

The same drawback of conventional filter presses using filter cloth is that the filtration ability decreases as the thickness of the filter slag layer adhering to the filter cloth increases.

To solve this problem, it is known that during filtration, for example, water is sometimes blown into the back side of the filter cloth to shake off the slag layer from the filter cloth. Although this can be achieved to some extent, there are problems such as poor dewatering effect and difficulty in automatically removing the filter dregs, and in the end, smooth filtration work cannot be expected.

It is also well known to perform filtration by simply pressing the filtration chamber with fluid, but even with this method, clogging of the filter cloth cannot be eliminated and filtration is hindered once the thickness of the filter slag layer reaches a certain level. It was due.

The present invention eliminates these drawbacks and is configured so that the filtrate is separated from the filter cloth by pressurizing the undiluted solution into the filtration chamber, so that the undiluted solution can be rapidly filtered on the filtration surface that is always free of filtration dregs. will be described with reference to the illustrated embodiment.

The filtration device shown in FIGS. 1 to 10 is provided with a stretchable water passage network 3 surrounding the cylindrical filter body 1 through a rubber bag 2 disposed on the entire inner circumferential surface of the body 1. The inner peripheral surface of the net 3 is covered with a filter cloth 4 to form a cylindrical stock solution filtration chamber A at the center of the fluid body.

An upper lid 5 is attached to the upper end of the filter body 1 by tightening bolts 6, and the upper lid 5 has a conical cylindrical guide portion 5 provided with a through hole 5a.
b are consecutively provided.

Then, connect the stock solution conduit pipe 7 and the air supply pipe 8 with a check valve to the upper lid 5.
It leads to the cavity 5c.

Further, at the bottom of the filter body 1, a bottom cover 9 having the same structure as the upper cover 5 is provided.
is rotatably mounted on a hinge 10 or the like, and a stock solution conduit 11 is opened in the bottom cover 9.

Note that reference numeral 12 denotes a fluid supply pipe such as water installed around the outer periphery of the filter body 1, and a passage opened in each rubber bag 2 so that fluid can be pressurized into the fluid chamber B formed in each rubber bag 2. A tube 18 is arranged.

For use in the filtration device of this example, first, the stock solution is pressurized into the filtration chamber A through the through holes 5a and 9a by a stock solution supply device consisting of a pump (not shown) and the conduction pipes 7 and 11, and then the rubber bag 2 and the Filtration is performed with the water net 3 and filter cloth 4 being pressed against the inner circumferential surface of the filter body 1, and the filtered water that has passed through the net 3 is guided to the collection pipe 14.

A filter sludge layer S is formed on the surface of the filter cloth 4 by filtration, and when the filtration sludge layer S reaches a predetermined thickness (see Figure 3), a fluid, water in this example, is pumped (not shown). ) and supply pipe 12
, each rubber bag 2 is supplied by a fluid supply device from a passage pipe 13.
．． ...Fluid chamber 3. Force feed to...

The pressure at this time needs to be higher than the pressure for injection of the undiluted solution.

As a result, the filtration chamber A is pressed, and the unfiltered stock solution in the filtration chamber A is discharged by flowing backward through the conduit pipes 7 and 11 that serve as the discharge mechanism, and the filter slag adhering to the filter cloth 4 is pressed together. The state shown in FIG. 4 is reached.

That is, each of the fluid chambers B, .

Next, when the pressure feeding of the water is stopped and the water is discharged from the fluid chamber B by flowing backward into the supply pipe 12, the pressure for injecting the stock solution overcomes and the filtration chamber A is filled with the stock solution, and the rubber bag 2, the water passage network 3, and the filter cloth 4 are filled with the stock solution. is pressed against the inner circumferential surface of the filter body 1 (see FIG. 5).

At this time, when the filter cloths 4 pressed by removing the water try to separate from each other, the stock solution is supplied by the stock solution supply device, but the stock solution that has been press-in is unable to dissolve the filter slag Sa that has become a lump. The filter slag Sa is press-fitted between the filter cloth 4 and the filter slag Sa is separated from the filter cloth 4.

The separated filter dregs adhere to a part of the filter cloth or are located in the center of the filter chamber A.

For this reason, a new stock solution is filtered on the filter cloth surface to which the filter slag Sa is not attached, and a new filtration sludge layer S is formed on the filter cloth surface again (see FIG. 5).

After a new filter layer S is formed, water is poured into each fluid chamber B again.
, .
The new filter dregs layer S and the old filter dregs Sa adhering to each other are pressed together (see FIG. 6).

Next, as described above, water is discharged from the fluid chamber B, the stock solution is press-fitted between the lump of filter slag sb and another filter cloth surface to which it is not attached, and a new filter slag S is added to the filter cloth. (See Figure 7).

This operation is repeated again, i.e., the water is forced into the respective fluid chambers B, . . . and the old filter dregs are pressed against the new filtration dregs while discharging the undiluted solution, and then the pressure in the fluid chamber B is lowered and the fluid is discharged. However, the operation of pressurizing the stock solution between the lumped filter dregs and the filter cloth surface to which it is not attached to form new filter dregs on the filter cloth surface is repeated an appropriate number of times.

As shown in FIG. 8, when the amount of filter scum Sc increases and it is desired to remove it, compressed air is rapidly supplied to the filtration chamber A at the same time as water is removed from the fluid chambers B, .

If even a small amount of this compressed air flows into the filtration chamber A, the slag begins to spread while adhering to a portion of the filter cloth 4 (see FIG. 9).

Then, the air pressure overcomes the air permeability of the filter cloth by the compressed air that is continuously and rapidly injected, and the rubber bag 2, the water passage network 3, and the filter cloth 4
is pressed against the inner circumferential surface of the filter body 1, and the filter dregs are removed from the filter cloth 4 at once, as shown by the imaginary line P in FIG.

According to experiments, it was possible to separate the filter slag from the filter cloth instantly by introducing compressed air.

Finally, the bottom cover 9 may be opened to allow the filter cake to fall naturally (see Fig. 10).

In this way, according to this example, the filter slag is made into a lump by the high-pressure suppression of the filtration chamber A of the fluid chamber B by the fluid supply device and the stock solution discharge mechanism, so that it is easy to discharge the filter slag and to process and handle the filter slag after the discharge. It becomes.

In addition, the feature of this example is that after the filter slag becomes a lump due to the suppression of the fluid chamber B, the stock solution is forced into the filtration chamber A while separating the lump of filter slag from the filter cloth by the connection between the stock solution supply device and the fluid drainage mechanism. In order to do this, the new stock solution that is press-ined must always be filtered through a filter cloth surface that is free of filter dregs and is less clogged.

In other words, even though there is filter dregs in the filtration chamber A, the stock solution is always filtered on the filter cloth surface to which no filtration dregs are attached, so the filtration action is quick and smooth, and it takes less time to create the same volume of filter dregs than in the conventional method. This will be considerably shorter than the original.

In addition, in the middle of the process of stacking the filter dregs of this example, a process of pumping compressed air instead of pressurizing the stock solution may be added an appropriate number of times.

In this way, the entire surface of the filter cloth 4 can perform the next filtration action.

Further, although the fluid chamber B in this example is formed of a plurality of rubber bags 2 as described above, it may be formed of one rubber pattern 2' and a warm body inner wall, as shown in FIGS. 11 and 12, for example. There is no problem.

Further, if the filter body is formed into a truncated conical shape, the filter dregs can be easily discharged.

Although this example is configured as described above, the present invention is not limited to this.

For example, the stock solution supply device to the filtration chamber and the fluid supply device to the fluid chamber may be automated by using a switching valve and a timer.

Further, the impermeable plate constituting the fluid chamber does not necessarily have to be stretchable, but only needs to be able to displace the volume of the filtration chamber until the filtration dregs are compressed.

The stock solution supply device and its discharge mechanism, and the fluid supply device and its discharge mechanism may be constructed as separate devices each provided with a check valve.

Note that the configuration of the filtration section of the filtration chamber is also arbitrary, and a wet wall may be configured by providing water passage grooves on the circumferential surface of the impermeable body.

In short, the present invention includes a cylindrical wetted wall and a filter cloth to form a stock solution filtration chamber, a fluid chamber formed by an impermeable material around the outer periphery of the filtration chamber, and a fluid supplied to the fluid chamber. A filtration device that changes the volume of a filtration chamber by displacing an impermeable body includes a high-pressure fluid supply device that suppresses and displaces the impermeable body until the filter slag formed in the filtration chamber is compressed into a mass; A fluid discharge mechanism that discharges from the chamber, a raw solution discharge mechanism that is connected to the fluid supply device and discharges the raw solution in the filtration chamber, and a fluid discharge mechanism that is connected to the fluid drainage mechanism and between a lump of filter slag and the filter cloth to which it is attached. This filtration device is characterized by being equipped with a stock solution supply device that can pressurize stock solution.

Therefore, according to the present invention, after the filtrate is compressed by a high-pressure fluid supply device connected to the undiluted solution discharge mechanism, the undiluted solution is pressurized together with the fluid drainage mechanism between the mass of the filtrate and the filter cloth to which it is attached. The stock solution that is press-injected by the stock solution supply device separates the filter dregs from the filter cloth, so that the newly supplied stock solution is always filtered on the filter surface to which no filter dregs are attached.

Therefore, the filtration condition can always be optimized and the filtration action can be carried out smoothly, and since the filtration is carried out in the filtration section to which no slag is attached, it has a great effect of allowing rapid filtration, and the thickness of the filtration layer in the filtration chamber is increased. However, there is no problem with filtration,
The filter dregs are compressed by a high-pressure fluid supply device to form a single mass, which makes it easy to drain, and the filter dregs have a uniform moisture content, which makes it easy to process and handle the filter dregs after discharge. There is also.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view of the stock solution injected, Fig. 3 is an enlarged NN cross-sectional view of Fig. 2, and Fig. 4 is a fluid flow diagram. 5 is a sectional view corresponding to FIG. 3 in a state where fluid is pressurized into chamber B; FIG. 5 is a sectional view corresponding to FIG.
Fig. 6 is a cross-sectional view corresponding to Fig. 3 in a state in which fluid is again pressurized, Fig. 7 is a cross-sectional view corresponding to Fig. 3 in the state shown in Fig. 6 with stock solution injected again, and Fig. 8 is a laminated layer. 9 is a longitudinal sectional view corresponding to FIG. 2 showing the filter slag being pumped into the filtration chamber A, and FIG. 10 is a diagram showing the discharged state of the filtration slag. A partially cutaway front view, FIG. 11 is a separate partially cutaway longitudinal sectional front view, and FIG. 12 is M-M in FIG. 11.
It is an enlarged sectional view. 4... Filter cloth, 2,2'... Opaque body,
7.11... Raw solution conduction pipe, 8... Compressed gas supply pipe, 12... Fluid supply pipe, 13...
...Water pipe, A...Filtering chamber, B...
Fluid chamber.

Claims (1)

[Claims] 1. A filter wall and a filter cloth are provided in a cylindrical shape to form a stock solution filtration chamber A, and a fluid chamber B formed of an impermeable material is provided around the outer periphery of the filtration chamber A, and a fluid is supplied to the fluid chamber B. In a filtration device that changes the volume of a filtration chamber A by displacing an impermeable body, a high-pressure fluid supply device presses and displaces the impermeable body until the filter slag formed in the filtration chamber A is compressed into a mass; a fluid drainage mechanism that discharges the fluid from the fluid chamber B; a fluid discharge mechanism that is connected to the fluid supply device and discharges the fluid in the filtration chamber A;
1. A filtration device characterized by comprising an undiluted solution supply device connected to a fluid drainage mechanism and capable of pressurizing an undiluted solution between a block of filter dregs and a filter cloth to which it is attached.