JPH0555165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a filter press capable of performing squeeze filtration without using a squeeze membrane.

Prior Art The present applicant has already proposed a filter press in which a plurality of filter plates each consisting of only a frame body without a filter bed are arranged in order to reduce the weight of the entire filter plate. In such a filter press,
When performing squeeze filtration, filter plates made of frames and filter plates having squeeze membranes are arranged alternately, and the stock solution is supplied between a pair of filter cloths placed between each filter plate. The squeeze membrane is expanded to compress and filter the stock solution between the two.

However, in such a filter press, since a material such as elastic rubber is used for the pressing membrane, there is a problem in that the properties of the stock solution that can be filtered are limited depending on the material of the pressing membrane.

Therefore, in order to solve this problem, the present applicant first adjusted the stock solution supply pressure in adjacent filter chambers, expanded one filter chamber, and compressed and filtered the filter residue in the other filter chamber. I applied for filter press.

Problems to be Solved by the Invention However, with the structure described above, depending on the properties of the stock solution, the pair of filter cloths forming the filter chamber may come into close contact with each other, making it impossible to supply the stock solution into the filter chamber. Problems sometimes arose.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a filter press that reduces the possibility of adjacent filter cloths coming into close contact with each other and can smoothly supply a stock solution into a filter chamber. Our goal is to provide the following.

Means for Solving the Problems In order to achieve the above object, the present invention suspends and supports a holding member between opposing filter cloths between adjacent filter chambers, and the filter cloths forming the filter chambers and the filter cloth. The structure is such that the stock solution is reliably supplied between the That is, a pair of first filter plates each having a filtration bed, each filter bed having a first stock solution supply port, and a second stock solution supply port at a predetermined location; a pair of second filter plates arranged between the filter plates and the second filter plate made of a frame;
a filter cloth having a first stock solution supply hole that can communicate with the first stock solution supply port of the filter plate, and a second stock solution supply hole that can communicate with the second stock solution supply port of the filter plate; A first stock solution supply system that supplies the stock solution to the stock solution supply port and the first stock solution supply hole of each filter cloth; and a stock solution supply system that supplies the stock solution to the second stock solution supply port of the first filter plate and the second stock solution supply hole of each filter cloth. a second undiluted solution supply system, a first filter chamber formed by the pair of filter cloths between the filter plates when the filter plates are tightened, and to which the undiluted solution is supplied from at least the first undiluted solution supply system; Second filter chambers to which the stock solution is supplied from two stock solution supply systems are alternately arranged between the first filter plates, and the second filter plate 3 is sandwiched within the frame of the second filter plate. The filter cloth is suspended between a pair of filter cloths, and has a stock solution supply port communicating with the first stock solution supply hole of the filter cloth, and also has a stock solution supply port that communicates with the filter chamber of the adjacent first stock solution supply system and the stock solution supply. Each of the filter plates has a holding member having a communication path for supplying the stock solution to communicate with the opening, and each of the filter plates has the second stock solution supply port of the second stock solution supply system in its frame, and The frame of a predetermined filter plate among the filter plates has a communication passage for supplying a stock solution that communicates the second stock solution supply port with the second filter chamber, and the stock solution is supplied to the filter chamber by both stock solution supply systems. By changing the pressures of the stock solutions, the filter cloth forming the filter chamber on the high pressure side expands and presses the filter residue in the filter chamber on the low pressure side to perform squeeze filtration.

Effects of the Invention In the above configuration, during filtration, the stock solution is supplied from the first stock solution supply system to the filter chambers of the first filter chamber group with the second filter plate sandwiched between the pair of first filter plates and tightened. Meanwhile, the stock solution is supplied from the second stock solution supply system to the filter chambers of the second filter chamber group. Make the stock solution supply pressure of the first stock solution supply system higher than the stock solution supply pressure of the second stock solution supply system, or stop the supply of stock solution from the second stock solution supply system and supply stock solution only from the first stock solution supply system. At this time, each filter chamber of the first filter chamber group expands, and the filter cloth forming the filter chamber presses the filter chamber of the second filter chamber group to compress and filter the filter residue in the filter chamber. next,
Make the stock solution supply pressure of the second stock solution supply system higher than the stock solution supply pressure of the first stock solution supply system, or stop the supply of stock solution from the first stock solution supply system and supply stock solution only from the second stock solution supply system. At this time, each filter chamber of the second filter chamber group expands, and the filter cloth forming the filter chamber presses the filter chamber of the first filter chamber group to compress and filter the filter residue in the filter chamber. By performing this operation alternately,
The filter residue in all the filter chambers is compressed and filtered. When the stock solution is supplied to each filter chamber, in the first stock solution supply system, the filter plate and the space are connected to each other by the communication path of the holding member.
The stock solution is supplied into the filter chamber from the stock solution supply port of the holding member or the stock solution supply hole of the filter cloth.

Effects of the Invention According to the above configuration, when one of the adjacent filter chambers is expanded toward the other filter chamber without using a compression membrane, the filter residue in one of the filter chambers is surely compressed and filtered. In the first stock solution supply system, the filter plate and the stock solution supply port of the spacer holding member or the stock solution supply hole of the filter cloth can be communicated with the filter chamber through the communication passage of the spacer holding member, and In the second stock solution supply system, the second stock solution supply port and the second filter chamber are communicated by the stock solution supply communication path, so that the stock solution can be reliably supplied into the filter chamber through the communication path. Therefore, it is possible to effectively avoid a phenomenon in which the pair of filter cloths forming the filter chamber come into close contact with each other due to the properties of the stock solution and the stock solution is not supplied into the filter chamber.

Embodiments Below, embodiments of the present invention will be described in detail based on FIGS. 1 to 16.

As shown in FIG. 1, the filter press according to this embodiment includes a pair of first filter plates, in which side beams are arranged on both sides between the front and rear stands (not shown), and a filter bed 1f is provided between the front and rear stands. 1, 1, and a large number of second filter plates 2, 3 consisting of only frames 2c are arranged between the pair of first filter plates 1, 1, and each filter plate 1, 2, 3 is movable back and forth. The adjacent filter plates 1 and 2 are suspended and supported on the side beam;
2, 3; A pair of filter cloths 5, 5 are arranged to be sandwiched between 3, 1, and a first stock solution supply system is installed in a portion corresponding to the filter bed portion inside the frame portion of the filter plates 1, 2, 3. , and a second stock solution supply system is formed in a portion corresponding to the frame portion of each filter plate 1, 2, 3. The filter chamber 6 is divided into two groups,
The filtration chambers 6a of one group are supplied with the stock solution from the first stock solution supply system, and the filtration chambers 6b of the other group are supplied with the stock solution from the second stock solution supply system. In this filter press, although not shown, a movable plate disposed between the first filter plate on the rear stand side and the rear stand is moved forward by a driving device, so that all of the filter plates 1, 2, and 3 are moved forward. Tighten it to the front stand side,
The structure is such that the stock solution is appropriately supplied from the front stand or the rear stand side through each stock solution supply system into the filter chamber 6 formed between each pair of filter cloths 5, 5 to perform filtration. In addition, in FIG. 1, in order to simplify the explanation, three second filter plates 2, 3, 2 are arranged between the first filter plates 1, 1, but the number of second filter plates is not limited to this, and may be any number of sheets.

FIG. 2 shows the stock solution supply system that supplies the stock solution to the filter chamber 6 of the filter press 7. The first stock solution supply system includes valves 8, 8, and the second stock solution supply system includes valves 8, 8.
The stock solution supply system is equipped with valves 9, 9, and by operating the valves 8, 9, a predetermined filter chamber 6 is supplied from the stock solution supply system.
A and 6b are supplied with the stock solution, or the supply of the stock solution is stopped. Note that the system having the valve 10 is a filtrate recovery system.

In the filter press 7, there are two types of second
Place the filter plates 2 and 3.

One of the second filter plates 2, as shown in FIGS. 3, 4, and 5, is generally composed of a frame 2c surrounding a space 2f. The frame 2c is made of a member having a pentagonal horizontal cross-section and a vertical cross-section, and has inclined surfaces 2e on its inner surface that are inclined on both sides from the center in the thickness direction. Inside this frame 2c, a holding member 4 is provided with a first stock solution supply port 4a as described later.
is suspended and supported by the filter cloths 5, 5. A handle 2d is provided near the center of each outer surface of each frame 2c, and each handle 2d is slidably mounted on the side beam installed on each side between the front and rear stands of the filter press. The second filter plates 2 are suspended and supported, and the back and forth movement of each second filter plate 2 is guided. 2nd above
A filtrate recovery port 2h, 2h penetrating in the thickness direction of the filter plate 2 is formed at each lower corner of the filter plate 2, and a space 2f inside the second filter plate 2 is formed between both filtrate recovery ports 2h, 2h.
Concave grooves 2i for filtrate collection are formed on either the front or rear surface of the frame 2c, respectively. Further, a protrusion 2g protruding downward is formed at the lower part of the frame 2c, and a second stock solution supply port 2b is formed through the protrusion 2g, and one of the front and rear surfaces of the filter plate 2 is formed. to the second stock solution supply port 2b.
A recess 2k is formed around the second stock solution supply port 2b to communicate the space 2f with the periphery of the second stock solution supply port 2b. A stock solution supply member 20 for supplying stock solution to the filter chamber 6b is attached to this recess 2k.

The stock solution supply member 20 includes a mounting ring 13 that fits into the second stock solution supply port 2b, and a recess 2k.
An annular clamping member 16 having a T-shaped cross section that is fitted to clamp around the second stock solution supply hole of the filter cloth 5, and a stock solution supply passage formed between the clamping member 16 and supplying the stock solution to the filter chamber 6b. Annular stock solution supply plate 1 having 14c
4 are connected with bolts 15, . . . , 15 and fixed to the second filter plate 2. Each member 13, 16, 14 has a stock solution supply port 13b, 16 penetrating through its center.
b, 14b, communicates with the second stock solution supply port 2b of the second filter plate 2, and constitutes a part of the second stock solution supply system.

As shown in FIGS. 6 and 7, the other second filter plate 3 has roughly the same structure as the one second filter plate 2, and the same parts are given the same numbers and their explanation will be omitted. The other second filter plate 3 is different from the one second filter plate 2 in that the second stock solution supply port 3b corresponding to the second stock solution supply port 2b has an annular recess 3k formed around the front and rear surfaces, respectively. However, each recess 3k
A gasket 12 having an undiluted solution supply port 12b and made of an elastic material such as rubber is fitted into the second
The stock solution supply port 3b does not communicate with the space 2f within the frame 2c. That is, the one second filter plate 2 can supply the stock solution supplied into the second stock solution supply port 2b into the space 2f, while the other second filter plate 3 can supply the stock solution supplied into the second stock solution supply port 2b. The stock solution supplied to the port 3b cannot be supplied into the space 2f. In the space 2e of the second filter plate 3, as will be described later, the second
Between the filter plates 2 = Between the structure different from the holding member 4 = The holding member 11 is suspended and supported by the filter cloths 5, 5.

Further, each of the filter cloths 5 is arranged replaceably before and after each of the second filter plates 2, 3, so that the inner spaces 2f, 2f of the second filter plates 2, 3 are sandwiched between the pair of filter cloths 5, 5. Make it. Each filter cloth 5 has a first stock solution supply hole 5a in a portion corresponding to the spaces 2f, 2f of each of the second filter plates 2, 3.
and spaces 2f, 2 of the second filter plates 2, 3
A pair of filter cloths 5, 5 arranged to sandwich f
In this step, the peripheral edges of the first stock solution supply holes 5a, 5a are sewn together and connected to each other. In the pair of filter cloths 5, 5 sandwiching the space 2f of the second filter plate 2, a retaining member 11 as shown in FIGS. 10 and 11 is suspended and supported at the sewn portion. A second filter holding member 4 as shown in FIGS. 12 to 14 is suspended and supported at the connecting portions of the pair of filter cloths 5, 5 sandwiching the space 2f of the other second filter plate 3. A second stock solution supply hole 5b communicating with the second stock solution supply ports 2b, 2b of the second filter plates 2, 3 is formed in the lower part of each filter cloth 5. Each of the filter cloths 5 has adjacent filter plates 1, 2;
3; 3, 1; A pair of filter cloths 5, 5 between 2, 1
are sandwiched between the filter cloths 5, 5, and filter chambers 6a, 5, respectively.
6b, 6a, 6b, and each filter cloth 5
are each given an expansion allowance, and when the stock solution is supplied to each filter chamber 6, it expands under the pressure of the stock solution and contacts and presses the filter cloth 5 forming the adjacent filter chamber 6. It is arranged so that it can be done. In addition,
In order to expand the filter cloth 5, in addition to expanding the filter cloth 5 by giving slack to the filter cloth 5 to ensure an expansion allowance, the material of the filter cloth itself is made of an elastic material, and the filter cloth 5 is expanded by the pressure of supplying the stock solution. It may be expanded by stretching.

As shown in FIGS. 10 and 11, the holding member 11 is made of an annular body, and the central part thereof has a stock solution supply port 11a through which the stock solution flows, and the annular portion has a hexagonal cross section. to do. The joined portions of the pair of filter cloths 5, 5 are passed through this stock solution supply port 11a and are suspended and supported.

The holding member 4 is an annular body as shown in FIGS. 12 to 14, and has a stock solution supply port 4a penetratingly formed in the center thereof, and has the stock solution supply port 4a formed on one surface thereof. A recess 4c extending further up and down is formed to form a communication path 17 communicating with the space 2f of the second filter plate 3. On the one surface, convex portions 4b, 4b are formed on the left and right portions of the stock solution supply port 4a so as to surround the concave portions 4c, 4c, respectively. The sewn portions of the pair of filter cloths 5, 5 are passed through the stock solution supply port 4a and are suspended and supported.

On the other hand, as shown in FIGS. 8 and 9, the first filter plate 1 has an outer frame portion protruding from the surface on the side where the second filter plates 2 and 3 are disposed to form a frame portion 1c. It is generally constructed by forming a recessed filter bed 1f within the frame 1c. An inclined surface 1e is formed between the frame portion 1c and the filter bed 1f to connect the two portions. Filter bed 1
A penetrating first stock solution supply port 1a is formed in the central portion of e, and a convex portion 1j having a trapezoidal cross section and projecting annularly is formed around the first stock solution supply port 1a.

In addition, a filtrate collection hole 1 is provided at the lower corner of the frame 1c.
A concave groove 1i is formed to penetrate through the filtrate recovery hole 1h and communicate the surface of the filter bed 1f with each filtrate recovery hole 1h. A downwardly protruding protrusion 1g is formed at the lower central portion of the frame 1c, and a second stock solution supply port 1b penetrating the protrusion 1g is formed. An annular recess 1k that does not communicate with the filter bed 1f is formed around the second stock solution supply port 1b, and a packing 1 made of rubber or the like and having a stock solution supply port 12b is formed in this recess 1k.
Fit 2. A tubular holding member 18 having a T-shaped cross section is fitted into the first stock solution supply port 1a from the second filter plate side, and this holding member 18 prevents the filter cloth 5 from surrounding the first stock solution supply hole 5a. This part is brought into close contact with the circumferential surface of the first stock solution supply port to prevent the stock solution from leaking from this part.

Therefore, the first stock solution supply port 1a of the first filter plate 1
, the first stock solution supply hole 5a of each filter cloth 5, and the first stock solution supply hole 5a of each filter cloth 5.
The stock solution supply port 11a of the holding member 11 and the stock solution supply port 4a of the second holding member 4 communicate with each other to constitute the first stock solution supply system. The filter chamber 6a communicates through the communication passage 17 and is located between the first filter plate 1 and the second filter plate 2, and is supplied to the filter chambers 6a of the second filter plates 3 and 2, respectively. Further, the second stock solution supply port 1b of the first filter plate 1 has a second stock solution supply hole 5 of each filter cloth 5.
b, each second stock solution supply port 2 of the second filter plates 2 and 3;
b, 3b and each stock solution supply port of the stock solution supply member 20 communicate with each other to constitute the second stock solution supply system, and the stock solution flowing through these is connected to the second stock solution supply port 2 of the second filter plate 2.
b, each stock solution supply port 13b, 1 of the stock solution supply member 20
6b, 14b and the stock solution supply passage 14c of the stock solution supply plate 14, and the filter chamber 6b between the second filter plate 2 and the second filter plate 3 and between the second filter plate 2 and the first filter plate 1. are respectively supplied to the filter chambers 6b.

According to the above configuration, it operates as follows.

That is, by moving the movable plate forward, all the filter plates 1, 2,
Tighten 3 to the front stand side to close the frame. In this state, between the convex portion 1j of the first filter plate 1 and the second
Between the convex portion 4b of the holding member 4 and the second gap〓The first gap between the convex portion 4b of the holding member 4〓The surface 1 of the holding member 11
1b and the first space = 11b of the holding member 11
The annular portions of the filter cloths 5, 5 around the first stock solution supply holes 5a, 5a are sandwiched between the filter cloths 5, 5 and the convex portion 1j of the first filter plate 1, respectively. On the other hand, the first filter plate 1
packing 12 and the second stock solution supply port 2 of the second filter plate 2
The annular portions of the filter cloths 5, 5 around the second stock solution supply holes 5b, 5b are sandwiched between the surrounding portions of the filter cloths 5, 5b, and the packing 12, and the surrounding portions of the stock solution supply ports 14b of the stock solution supply plate 14, respectively. A communication path 17 is formed between the filter cloths 5 and 5 in the concave portion 4c of the second gap holding member 4, and the undiluted solution passes through the first stock solution supply port 1a and the first stock solution supply hole 5a. Passage 1
7 and into the filter chamber 6a. In addition, the stock solution supply passage 14c of the stock solution supply plate 14
The second stock solution supply ports 1b, 2b, 3b and the second
The stock solution passing through the stock solution supply hole 5b is passed through the stock solution supply passage 14c.
It becomes possible to enter the filter chamber 6b through the filter chamber 6b.

Then, one valve (for example, the valve 8 on the left side in FIG. 2) of the first stock solution supply system is opened, and while the other valve 8 remains closed, the stock solution is supplied from the front stand side to the first filter plate 1.
The first stock solution supply port 1a of the filter cloth 5, the first stock solution supply hole 5a of the filter cloth 5, the first stock solution supply hole 5a of the filter cloth 5, the first filter plate through the communication path 17 formed between the recess 4c of the holding member 4 and the filter cloth 5. It is supplied to a filter chamber 6a formed between a pair of filter cloths 5, 5 between the first filter plate 1 and the second filter plate 2, and filtration is performed. Similarly, the above stock solution is further supplied between the first stock solution supply holes 5a, 5a of the filter cloths 5, 5, and the holding member 4.
stock solution supply port 4a, first stock solution supply ports 5a, 5a of filter cloths 5, 5, second space; stock solution supply port 11a of holding member 11; first space: recess 4c of holding member 4 and filter cloth 5.
is supplied to the filter chamber 6a formed between the pair of filter cloths 5, 5 between the second filter plate 2 and the first filter plate 1 through the communication path 17 formed between the filter plates 2 and 1 to perform filtration. .

At the same time, open one valve (for example, valve 9 on the left side in FIG. 2) of the second stock solution supply system and open the other valve 9.
While the is closed, pour the stock solution from the front stand side into the first stand.
The second stock solution supply port 1b of the filter plate 1, the stock solution supply port 12b of the packing 12, the second stock solution supply hole 5 of the filter cloths 5, 5
b, second stock solution supply port 2b of second filter plate 2, mounting ring 1
3, the second stock solution supply hole 5b of the filter cloth 5, the stock solution supply port 16b of the clamping member 16, and the stock solution supply port 14b of the stock solution supply plate 14. Then, the stock solution is supplied to the filter chamber 6b formed between the pair of filter cloths 5, 5 between the second filter plate 2 and the second filter plate 3 through the stock solution supply passage 14c of the stock solution supply plate 14, and filtration is performed. conduct. Similarly, the above stock solution is further supplied to the stock solution supply port 14b of the stock solution supply plate 14, the second stock solution supply hole 5b of the filter cloth 5, and the stock solution supply port 12 of the packing 12.
b, second stock solution supply port 3b of second filter plate 3, stock solution supply port 12b of packing 12, second stock solution supply holes 5b, 5b of pair of filter cloths 5, 5, second stock solution supply of second filter plate 2 Port 2b, stock solution supply port 13b of the mounting ring 13, second stock solution supply hole 5b of the filter cloth 5, stock solution supply port 16b of the clamping member 16, stock solution supply port 14 of the stock solution supply plate 14
Pass b. Then, the stock solution is supplied through the stock solution supply passage 14c of the stock solution supply plate 14 to the filter chamber 6b formed between the pair of filter cloths 5, 5 between the second filter plate 2 and the first filter plate 1, and filtered. I do.

When both the filter chambers 6a and 6b are filled with the stock solution, one valve, for example, valve 8, is closed to stop the supply of stock solution from the first stock solution supply system, while valve 9 is kept open and the second The stock solution supply system continues to supply stock solution. As a result, the stock solution is not supplied to each filter chamber 6a, but the stock solution is further supplied to each filter chamber 6b, so that the filter cloths 5, 5 surrounding each filter chamber 6b expand and surround the filter chamber 6a. Contact and press the filter cloths 5,5. As a result, the filter chamber 6a expands due to the expansion of the filter chamber 6b.
is compressed, and the filter residue in the filter chamber 6a is compressed and filtered. Normal filtration is performed in the filter chamber 6b. In particular, in the filter chamber 6a between the second filter plate 3 and the second filter plate 2 on the right side of the second filter plate 3 in FIG. 1, the filter chambers 6b, 6b expand from both sides. is pressed from both sides to perform compression filtration.

After a certain period of time, the valve 8 is opened and the stock solution is again supplied to the first stock solution supply system, while the valve 9 is closed and the supply of stock solution in the second stock solution supply system is stopped. As a result, contrary to the above, the filter chamber 6a
The filter cloths 5, 5 surrounding the filter chamber 6b expand and press the filter residue in the filter chamber 6b to perform compression filtration. At this time, normal filtration is performed in the filter chamber 6a. Thereafter, similar valve switching is performed, and the stock solution supplied into the filter chambers 6a, 6b is compressed and filtered.

Furthermore, in filtration by squeezing, when the water content in the filtrate falls below a certain level, the filtration efficiency drops sharply, resulting in a drastic drop in the flow rate of the filtrate discharged per unit time. Therefore, if this timing is detected and the opening/closing states of the valves 8 and 9 are switched, efficient operation can be achieved.

Another method for determining the switching timing is, for example, by measuring the internal pressure of the first stock solution supply system and the second stock solution supply system, respectively, and when the difference in the measured pressure exceeds a certain tolerance value. The opening/closing states of the valves 8 and 9 may be switched at the same time.

In the explanation of the operation of this embodiment, both valves 8 and 9 are opened at the initial stage of operation, but it is possible to open only one valve 8 or 9 from the beginning.
The valves may be switched after the filter chamber of the system is first filled with liquid.

The squeeze-filtered filter residue is held between the pair of filter cloths 5, 5, and the filtrate flows down through the filter cloth 5 to the filtrate collection port 1 of each filter plate 1, 2, 3.
h, 2h, and 2h, respectively. After one filtration process is completed, as is well known, the movable plate is moved back to move the filter plates 1, 2, and 3 back, and the filter residue held in the pair of filter cloths 5, 5 between the filter plates is collected. and prepare for the next filtration.

According to the above embodiment, one filter chamber 6 is replaced with the other filter chamber 6 in adjacent filter chambers 6 without using a compressed membrane.
When the filter residue in one of the filter chambers 6 is surely compressed and filtered by expanding toward
7, each of the stock solution supply ports 1a and 4a of the filter plate 1 and the holding member 4 or the stock solution supply hole 5 of the filter cloth 5
a can be communicated with the filter chamber 6a, and the stock solution can be reliably supplied into the filter chamber 6a through the communication path 17. In the second stock solution supply system, the stock solution supply passage 14c of the stock solution supply plate 14 is connected to the second stock solution supply ports 1b, 2 of the filter plates 1, 2, and 3.
b, 3b and the second stock solution supply hole 5b of the filter cloth 5 can be communicated with each filter chamber 6b, and the stock solution can be reliably supplied to each filter chamber 6b through the stock solution supply passage 14c. Therefore, it is possible to effectively avoid a phenomenon in which the pair of filter cloths 5, 5 forming the filter chambers 6a, 6b come into close contact with each other due to the properties of the stock solution, and the stock solution is not supplied into the filter chamber 6. can. Moreover, between the above-mentioned holding members 4 and 11, the second
Since a space can also be secured between the pair of filter cloths 5, 5 that sandwich the filter plates 2, 3, it is also possible to improve the drainage of the filtrate.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various other embodiments.

For example, as shown in FIGS. 15 and 16, each stock solution supply port and stock solution supply hole of the second stock solution supply system may be provided in the filter bed portion of the filter plate similarly to the first stock solution supply system. In this case, between the first and second holding members 11 and 4 are provided, and the stock solution is supplied from the second stock solution supply system to each filter chamber 6b. The arrangement order is made to be different from that of the first stock solution supply system. The 15th filter plate is a second filter plate 19, and parts that perform the same functions as the second filter plate 2 are designated by the same reference numerals and their explanations will be omitted. In addition, in the figure,
19l is the filtrate collection opening, 19i is the opening 19l
This is a communication hole that communicates between the filtrate recovery port 2h and the filtrate recovery port 2h.

Alternatively, two filter chambers 6a and two filter chambers 6b may be arranged alternately. In this case, the squeezing action is carried out from one side of each of the two squeezed filtration chambers arranged side by side on the opposite sides. Therefore, it is preferable that only one filter chamber is provided at both ends.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of essential parts of a filter press according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the stock solution supply system of the filter press, and FIGS. 3, 4, and 5 are respectively views of the filter press. 6 and 7 are a front view and a sectional side view of the second filter plate 3, respectively. 1. A front view and a cross-sectional side view of the first filter plate, and FIGS.
14 is a plan view, a front view, and a half-sectional side view of the second filter plate 19, respectively, and FIGS. 15 and 16 are a front view and a sectional side view, respectively, of the second filter plate 19 according to other embodiments. 1...First filter plate, 1a...First stock solution supply port, 1
b...Second stock solution supply port, 1c, 2c...Frame, 1
d, 2d...Handle, 1e, 2e...Slope, 1f
...Filter bed, 1g, 2g...Protrusion, 1h, 2h
...Filtrate collection port, 1i, 2i...concave groove, 1j...
Convex portion, 1k, 2k, 3k... Concave portion, 2, 3, 19
...Second filter plate, 2b, 3b...Second stock solution supply port,
2f...Space, 4...Second space Holding member, 4a...
...First stock solution supply port, 4b...Convex portion, 4c...Concave portion, 5...Filter cloth, 5a...First stock solution supply hole, 5b
...Second stock solution supply hole, 6, 6a, 6b...Filter chamber,
7...Filter press, 8,9,10...Valve, 1
1... First interval holding member, 11a... First stock solution supply port, 12... Packing, 12b, 13b, 14
b, 16b...Stock solution supply port, 13...Mounting ring, 1
4...Stock solution supply plate, 14c...Stock solution supply passage, 1
5... Bolt, 16... Holding member, 17... Communication path, 18... Holding member, 20... Stock solution supply member.

Claims (1)

[Scope of Claims] 1. A pair of first filter plates 1 each having a filter bed 1f, each filter bed 1f having a first stock solution supply port 1a, and each having a second stock solution supply port 1b at a predetermined location. , 1, a second filter plate 2, 3 arranged between the pair of first filter plates 1, 1 and consisting of a frame 2c, and a pair of second filter plates 2, 3 arranged between the pair of filter plates 1, 2, 3,
A first stock solution supply hole 5a that can communicate with the first stock solution supply port 1a of the first filter plate 1, and a second stock solution supply port 1.
supplying the stock solution to the first stock solution supply port 1a of the first filter plate 1 and the first stock solution supply hole 5a of each filter cloth 5; 1st
a stock solution supply system; a second stock solution supply system that supplies the stock solution to the second stock solution supply port 1b of the first filter plate 1 and the second stock solution supply hole 5b of each filter cloth 5;
a first filter chamber 6a formed by the pair of filter cloths 5, 5 between the filter plates when the filter plates are tightened and to which the concentrate is supplied from at least the first concentrate supply system; The filter chambers 6 are alternately arranged between the first filter plates 1 and 1, and the frame bodies 2c of the second filter plates 2 and 3 are alternately arranged with second filter chambers 6b to which the stock solution is supplied from the second stock solution supply system. The first filter cloth 5 is suspended between a pair of filter cloths 5, 5 sandwiching the second filter plates 2, 3 between the filter cloths 5, 5.
The holding member 4 has a stock solution supply port 4a that communicates with the stock solution supply hole 1a, and also has a stock solution supply communication passage 17 that communicates the stock solution supply port 4a with the filter chamber 6a of the adjacent first stock solution supply system. Further, each of the filter plates 1, 2, and 3 has a frame body 1.
c and 2c have the second stock solution supply ports 1b, 2b, and 3b of the second stock solution supply system, and the frame of a predetermined filter plate among the filter plates 1, 2, and 3 is provided with the second stock solution It has a communication path 14c for stock solution supply that communicates the supply ports 1b, 2b, 3b with the second filtration chamber 6b, and mutually changes the pressure of the stock solution supplied to the filter chambers 6a, 6b in both stock solution supply systems. As a result, the filter cloth 5 forming the filter chamber 6 on the high pressure side expands to form the filter chamber 6 on the low pressure side.
A filter press characterized in that filter filtration is performed by pressing the filter residue inside the filter press. 2 The filter chamber 6 is configured by alternately arranging two first filter chambers 6a and two second filter chambers 6b between the first filter plates 1, 1. A filter press according to scope 1.