JPH01224014A - Filter press - Google Patents

Abstract

PURPOSE:To smoothly carry out the pressing filtration eliminating the tight adhesion of each filter cloth by hanging and supporting the clearance keeping members between confronting filter cloth in the neighboring filter chambers, and changing the pressure of the raw liquid supplied to the filter chambers each other through plural raw liquid supply system. CONSTITUTION:In the filtration, a raw liquid is supplied to the filter chamber 6a of a 1st filter chamber group from a 1st raw liquid supply system I in the state that a 2nd filter plates 2, 3 are pressed between a pair of 1st filter plates 1, while a raw liquid is supplied to the filter chamber 6b of a 2nd filter chamber group from a 2nd raw liquid supply system II. When the raw liquid supply pressure of one liquid supply system is made higher than that of the other raw liquid supply system or a raw liquid is supplied from only one raw liquid supply system, the filter chambers of one side are enlarged and the filter cloth 5 forming these filter chambers presses the filter chambers of the other side, and the cake of the filter chambers is filtered with pressure. These filtration is alternatively carried out between the filter chamber groups, and the filter cloth 5 is prevented from tight adhesion therebetween by clearance keeping members 4, 11 hung and supported by the filter cloth 5.

Description

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

BACKGROUND OF THE INVENTION The present applicant has already proposed a filter press constructed by arranging a plurality of filter plates consisting only of frames without a filter bed in order to reduce the weight of the entire filter plate. When performing squeeze filtration in such a filter press, filter plates consisting of a frame body and filter plates having a squeeze membrane are arranged alternately, and the stock solution is distributed between a pair of filter cloths arranged between each filter plate. supply,
The squeeze membrane is expanded to compress and filter the stock solution between the filter cloths.

However, in such a filter press, since a material such as elastic rubber is used for the pressing membrane, there is a problem 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 applicant first
The patent application has been filed for a filter press in which the stock solution supply pressure is adjusted in adjacent filter chambers, one filter chamber is expanded, and the filter residue in the other filter chamber is compressed and filtered.

Problems to be Solved by the Invention However, with the structure described above, depending on the properties of the stock solution, a problem arises in that the pair of filter cloths forming the filter chamber come into close contact with each other, making it impossible to supply the stock solution into the filter chamber. Something happened.

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 that can smoothly supply stock solution into the filter chamber. It is about providing.

Means for Solving the Problems In order to achieve the above object, the present invention suspends and supports a gap holding member between opposing filter cloths between adjacent filter chambers,
The structure is such that the stock solution is reliably supplied between the filter cloths forming the filter chambers. 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 first stock solution supply holes that are arranged between the filter plates and can communicate with the first stock solution supply port of the first filter plate; A filter cloth each having a second stock solution supply hole that can communicate with the stock solution supply port, and a first stock solution supply that supplies the stock solution to the first stock solution supply port of the first filter plate and the first stock solution supply hole of each filter cloth. a second 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, and a second 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, and The first filter chamber is formed of a filter cloth and is alternately connected to at least a first filter chamber to which the stock solution is supplied from the first stock solution supply system and a second filter chamber to which the stock solution is supplied from the second stock solution supply system. Filter chambers arranged between plates,
A stock solution supply port is provided within the frame of the second filter plate, suspended between a pair of filter cloths sandwiching the second filter plate 3, and communicating with the first stock solution supply hole of the filter cloth. In addition to having
a gap holding member having a communication passage for stock solution supply that communicates the filter chamber of the first stock solution supply system adjacent to the stock solution supply port, and the pressure of the stock solution supplied to the filter chamber in both of the stock solution supply systems is controlled. In contrast, 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 compression filtration.

Effect of the Invention In the above configuration, during filtration, the second filter plate is placed between the pair of first filter plates.
With the filter plates sandwiched and tightened, the stock solution is supplied from the first stock solution supply system to the filter chambers of the first filter chamber group, while the stock solution is supplied from the second stock solution supply system to the filter chambers of the second filter chamber group. supply

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, either 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 stock solution supply from the first stock solution supply system and only use the stock solution from the second stock solution supply system. When supplying the stock solution, the second
Each filter chamber of the filter chamber group expands, and the filter cloth forming the filter chamber presses the filter chamber of the 1a 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 supplying the stock solution to each filter chamber, in the first stock solution supply system, the stock solution is supplied into the filter chamber from the stock solution supply port of the filter plate and the gap holding member or the stock solution supply hole of the filter cloth through the communication path of the gap holding member. supply

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 squeeze membrane, the filter residue in the one filter chamber is reliably squeeze-filtered. In the first stock solution supply system, the communication passage of the gap holding member allows communication between the stock solution supply port of the filter plate and the gap holding member, or the stock solution supply hole of the filter cloth, and the filter chamber, so that the stock solution can be supplied to the filter chamber. It 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 with reference to FIGS. 1-16.

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 IF is provided between the front and rear stands. 1.1, and the first of the pair.
A large number of second filter plates 2.3 consisting of only frames 2c are arranged between the filter plates 1.1, and each filter plate 1, 2.3 is suspended and supported on the side beam so as to be movable back and forth. Board 1, 2.
A pair of filter cloths 5, 5 are arranged to be sandwiched between the filter plates 1, 2. ．． A first stock solution supply system I is formed in a part corresponding to the filter bed part inside the frame part of No. 3, and a second stock solution supply system I is formed in a part corresponding to the frame part of each filter plate 1, 2.3. and configure. The filter chamber 6 is divided into two groups, and the filter chamber 6a of one group is supplied with the stock solution from the first stock solution supply system l, and the filter chamber 6b of the other group is supplied with the second stock solution. The stock solution is supplied from 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 1.2.3 are moved forward. Tighten it to the front stand side, and connect each pair of filter cloths 5.5 from the front stand or rear stand side through each stock solution supply system (■, ■).
The structure is such that the stock solution is appropriately supplied into the filtration chamber 6 formed in between to perform filtration. In addition, in FIG. 1, the first filter plate l is shown to simplify the explanation.

Although three second filter plates 2.3.2 are arranged between the two filter plates, the number of second filter plates is not limited to this and may be any number.

FIG. 2 shows the stock solution supply system I for supplying the stock solution to the filter chamber 6 of the filter press 7. The above first stock solution supply system I
is equipped with a valve 8.8, and the second stock solution supply system H is equipped with a valve 9.
9, the valve 8.9 is operated to supply the stock solution from the stock solution supply system I section to the predetermined filter chambers 6a, 6b, or to stop the stock solution supply. Note that the system having the valve 10 is a filtrate recovery system.

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

One of the second filters 2, as shown in Fig. 3.4.5, is roughly composed of a frame 2c surrounding the space 2''.

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. This frame 2
In c, a gap holding member 4 having a No. 1 stock solution supply port 4a is suspended and supported by the filter cloths 5, 5, as will be described later. A handle 2d is located near the center of each outer surface of each frame 2c.
The handles 2d are slidably mounted on the side beams installed on each side between the front and rear stands of the filter press, and the second filter plates 2 are suspended and supported. Guides the back and forth movement. Each lower corner of the second filter plate 2 is provided with a filtrate recovery port 2h penetrating in the thickness direction of the filter plate.

2h, and filtrate recovery grooves 21 communicating between both filtrate recovery ports 2h, 2h and the internal space 2r of the second filter plate 2 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 2 is formed in the protrusion 2g.
b, and a recess 2k is formed on one of the front and rear surfaces of the filter plate 2 around the second stock solution supply port 2b to communicate the space 2f with the surroundings of the second stock solution supply port 2b. Form. A stock solution supply member 20 for supplying stock solution to the filter chamber 6b is attached to this recess 2k.

The undiluted solution supply member 20 has a T-shaped cross section that includes a mounting ring 13 that is fitted into the second undiluted solution supply port 2b, and a mounting ring 13 that is fitted into the recess 2k to sandwich the periphery of the second undiluted solution supply hole of the filter cloth 5. The annular clamping member 16 and the annular stock solution supply plate 14 having a stock solution supply passage 14c formed between the clamping member 16 and supplying the stock solution to the filter chamber 6b are connected by bolts 15. . . . are connected at 15 and fixed to the second filter plate 2. Each member 13, 16.1
4 are stock solution supply ports 13b and 16b penetrating through the center thereof.
, I 4b, 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 (2).

As shown in Figure 6.7, 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 2nd one above
The difference between the filter plate 3 and the second filter plate 2 is that annular recesses 3k are formed around the front and rear surfaces of the second stock solution supply port 3b, which corresponds to the second stock solution supply port 2b. A packing 12 having a stock solution supply port 12b and made of an elastic material such as rubber is fitted into each of the four parts 3k, and the second stock solution supply port 3b does not communicate with the space 2f within the frame 2c. That's true. That is, the one second filter plate 2 is the second filter plate 2.
The stock solution supplied into the stock solution supply port 2b can be supplied into the space 2f, but the other second filter plate 3 allows the stock solution supplied into the second stock solution supply port 3b to be supplied into the space 2f. We are making it impossible for them to supply it. In the space 2e of the second filter plate 3, as will be described later, a gap holding member 2 having a structure different from the gap holding member 4 of the second filter plate 2 is suspended and supported by 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, and the pair of filter cloths 5.5
The internal spaces 2f and 2r are sandwiched between them. Each filter cloth 5 is a space 2f between the second filter plates 2 and 3.

In a pair of filter cloths 5, 5, which have a first stock solution supply hole 5a in a portion corresponding to 2f and are arranged to sandwich the spaces 2f, 2f of the second filter plates 2, 3, 1
The peripheral edges of the 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 2r of one of the second filter plates 2, a gap maintaining member 11 as shown in FIG. 10.11 is suspended and supported at the sewn portion. In the pair of filter cloths 5.5 sandwiching the space 2r of the other second filter plate 3, a second gap holding member 4 as shown in FIGS. 12 to 14 is suspended and supported at the sewn portion thereof. 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 filter cloth 5 has a pair of filter cloths 5, 5 sandwiched between adjacent filter plates 1, 2.2.3.3, 2.2.1, and a filter chamber 6, respectively, between both filter cloths 5.5.
a, 6b, 6a, 6b, and each filter cloth 5 is given an expansion allowance, so that when the stock solution is supplied to each filter chamber 6, it expands under the pressure of the stock solution, and the adjacent filter chamber It is arranged so that it can contact and press the filter cloth 5 forming the filter cloth 6. Note that this expansion of the filter cloth 5
In addition to expanding the filter cloth 5 by providing slack to ensure an expansion allowance, the material of the filter cloth itself may be made of an elastic material so that the filter cloth 5 expands by being stretched by the stock solution supply pressure. .

The first gap holding member 11 is made of an annular body as shown in FIG. 10.11, and has a stock solution supply port 11a through which the stock solution flows through the center thereof, and the annular portion has a hexagonal cross section. Eggplant. The sewn portions of the pair of filter cloths 5, 5 are passed through this stock solution supply port 11a and are suspended and supported.

The second gap holding member 4 is formed of 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 a stock solution supply port 4a formed on one surface thereof. A communication path 17 communicating with the space 2r of the second filter plate 3 is formed by forming a recess 4c extending vertically. On the one surface, convex portions 4 b and 4 b are respectively formed on the left and right portions of the stock solution supply port 4 a so as to surround the concave portion 4C94c. The pair of filter cloths 5 are connected to this stock solution supply port 4a.
, 5 sewn parts.

It is suspended and supported.

On the other hand, as shown in FIG. 8.9, the first filter plate l has an outer frame portion protruding from the surface on the side where the second a plate 2.3 is disposed to form a frame portion 1c. It is generally constructed by forming a recessed filter bed 1r in the portion 1c. An inclined surface le is formed between the frame portion 1c and the filter bed 1f to connect the image portions. A penetrating first stock solution supply port 1a is formed in the center of the filter bed 1e, 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, grooves 1i are formed in the lower corners of the frame 1c to pass through the filtrate recovery holes 1h and communicate the filtrate recovery holes 1h with the surface of the filter bed If. A downwardly protruding protrusion 1g is formed at the lower central portion of the frame lc, and a second stock solution supply port tb penetrating the protrusion tH 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 12 made of rubber or the like and having a stock solution supply port 12b is fitted into this white portion 1k. . In addition, the first undiluted solution mentioned above is a must! A tubular holding member 18 having a T-shaped cross section is fitted into the second filter plate side from the side of the second filter plate, and the holding member 18 controls the area around the first stock solution supply hole 5a of the filter cloth 5 from the first stock solution supply port. Make sure that it is in close contact with the surrounding surface to prevent the undiluted solution from leaking from this area.

Therefore, the first stock solution supply port 1a of the first filter plate 1 includes the first stock solution supply hole 5a of each filter cloth 5, and the first stock solution supply hole 5a of the first gap holding member 1.
The stock solution supply port 11a of the first stock solution supply port 11a and the stock solution supply port 4a of the second gap holding member 4 communicate with each other to constitute the first stock solution supply system I, and the stock solution flowing through these is connected to the communication path 17 of the second gap holding member 4.
a filter chamber 6a that communicates through the filter chamber 6a and is located between the second tilt plate 1 and the second filter plate 2; and a filter chamber 6a of the second filter plates 3 and 2;
are supplied respectively. Further, the second stock solution supply port 1b of the first filter plate 1 includes a second stock solution supply hole 5b of each filter cloth 5, each second stock solution supply port 2b, 3b of the second filter plate 2.3, and a stock solution supply port 1b of the first filter plate 1. The stock solution supply ports of the supply member 20 communicate with each other to constitute the second stock solution supply system (2), and the stock solution flowing through these ports is connected to the second stock solution supply port 2b of the second filter plate 2 and each stock solution supply of the stock solution supply member 20. Mouth 1
3b, l 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 the second filter plate 2 and the first filter plate l. and are respectively supplied to the filter chambers 6b between them.

According to the above configuration, it operates as follows.

That is, the movable plate is moved forward and all the filter plates 1, 2.3 are tightened toward the front stand to close the frame. In this state, between the convex part N of the first filter plate l and the convex part 4b of the second gap retaining member 4, and between the convex part 4b of the second gap retaining member 4 and the surface 11b of the first gap retaining member 11, and the first gap holding member 1
The annular portions of the filter cloth 5.5 around the first stock solution supply holes 5a, 5a are respectively sandwiched between the l1b of the filter cloth 5.5 and the convex portion 1j of the first filter plate l. On the other hand, the packing 12 of the first filter plate l, the part around the second stock solution supply port 2b of the second filter plate 2, and the part around the stock solution supply port 14b of the stock solution supply plate 14 and the packing 12 are connected to the filter cloth. The annular portions around the second stock solution supply holes 5b, 5b are sandwiched, respectively. In the concave portion 4C of the second gap holding member 4, a communication path 17 is formed between the filter cloths 5, 5, and the undiluted solution passing through the first stock solution supply port 1a and the first stock solution supply hole 5a passes through the communication path. 1
7 and into the filter chamber 6a. In addition, the stock solution passing through the second stock solution supply ports 1 b, 2 b, 3 b and the second stock solution supply hole 5b is passed through the stock solution supply passage 14c of the stock solution supply plate 14 and is transferred to the filtration chamber 6b.
It becomes possible to go inside.

Then, one valve (for example, the valve 8 on the left side in FIG. 2) of the first stock solution supply system I is opened, and while the other valve 8 remains closed, the stock solution is supplied from the front stand side to the first Stock solution supply port 1
a, the first stock solution supply hole 5a of the filter cloths 5, 5, the communication path 17 formed between the recess 4C of the first gap holding member 4 and the filter cloth 5;
A pair of filter cloths 5 between the first plate l and the second filter cloth 2,
It is supplied to the filter chamber 6a formed between 5 and 5 to perform filtration. Similarly, the above stock solution is further supplied to the first stock solution supply holes 5a, 5a of the filter cloths 5, 5, the stock solution supply port 4a of the first gap holding member 4, and the first stock solution supply 05a of the filter cloths 5, 5. , 5a,
The second filter plate 2 and the first filter cloth 1 are connected to each other through the communication path 17 formed between the stock solution supply port 11a of the second gap holding member 11, the recess 4C of the first gap holding member 4, and the filter cloth 5. A pair of filter cloths between 5. It is supplied to the filter chamber 6a formed between -5 and filtered.

At the same time, one valve (for example, the valve 9 on the left side in FIG. 2) of the second stock solution supply system H is opened while the other valve 9 remains closed.
The undiluted solution is supplied from the front stand side to the second undiluted solution supply port tb of the first plate 1a, the undiluted solution supply port 12b of the packing 12, the second undiluted solution supply hole 5b of the filter cloths 5, 5, and the second undiluted solution supply port of the second filter plate 2. 2b
, the stock solution supply port 13b of the attachment ring 13, 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 filtered. I do.

Similarly, the stock solution is further supplied to the stock solution supply port 14bSit! of the stock solution supply plate 14! Second stock solution supply hole 5b of r cloth 5
, the stock solution supply port 12b1 of the packing 12, the second of the second filter plate 3
Stock solution supply port 3b, 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 port 2b of second filter plate 2, stock solution supply port of mounting ring 13 13
b, pass through 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 through the stock solution supply passage 14c of the stock solution supply 1iE14 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 filtration is performed. conduct.

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 I, while valve 9 is kept open and the first stock solution is closed. 2. The stock solution supply system ■ continues to supply the 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 the filter cloth 5.5 surrounding each filter chamber 6b
expands and contacts and presses the filter cloths 5, 5 surrounding the filter chamber 6a. As a result, the filter chamber 6a is compressed by the expansion of the filter chamber 6b, and the filter residue in the filter chamber 6a is compressed and filtered. Filter chamber 6b
Then normal filtration is performed. In particular, the filter chamber 6a between the second filter plate 3 and the second filter plate 2 on the right side in FIG.
Now, since the filter chambers 6b and 6b expand from both sides,
The filter chamber 6a 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 I, while the valve 9 is closed and the stock solution is again supplied to the first stock solution supply system I.
The supply of the stock solution in the stock solution supply system (■) is stopped. As a result, contrary to the above, the filter cloths 5, 5 surrounding the filter chamber 6a expand and press the filter sludge in the filter chamber 6b to perform compression filtration. At this time, normal filtration is performed in the filter chamber 6a. below,
A similar valve switching is performed, and the filter chambers 6a, 6
The stock solution supplied in b is subjected to compression filtration.

In addition, in filtration by squeezing action, when the water content in the filter residue falls below a certain level, the filtration efficiency decreases rapidly, and the flow rate of the filtrate discharged per unit time decreases sharply. Therefore, if this timing is detected and the opening/closing states of the valves 8 and 9 are switched, efficient operation can be achieved.

In addition, as another method for determining the switching timing, for example, the internal pressure of the first stock solution supply system I and the second stock solution supply system ■ is measured, and the difference between the measured pressures is set to a certain allowable value. The opening/closing states of the valves 8 and 9 may be switched when the temperature exceeds the threshold.

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

The squeeze-filtered filter residue is held between the pair of filter cloths 5, 5, and the filtrate flows down the filter cloth 5 to the filtrate collection ports 1h, 2h, 2h of each filter plate 1, 2.3. will be collected respectively. - After the completion of the filtration process, as is well known,
Retract the movable plate and remove each filter plate l.

2.3 is moved back, and the filter residue held by the pair of filter cloths 5.5 between the filter plates is collected and prepared for the next filtration.

According to the above embodiment, one of the filter chambers 6 in the adjacent filter chambers 6 is expanded toward the other filter chamber 6 without using a squeezing membrane, and the filter residue in the one filter chamber 6 is reliably compressed. When filtering, in the first stock solution supply system I, the stock solution is supplied to each stock solution supply port 1a, 4a of the filter plate l and gap holding member 4 or to the filter cloth 5 through the communication path 17 of the second gap holding member 4. The holes 5a and the filter chamber 6a can be communicated with each other, and the stock solution can be reliably supplied into the filter chamber 6a through the communication path 17. In addition, in the second stock solution supply system H, the stock solution supply passage 14c of the stock solution supply plate 14 connects the filter plate 1.2.3.
The second stock solution supply ports 1b, 2b, 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 is passed through the stock solution supply passage 14C to each filter chamber 6b. can be reliably supplied. Therefore, the filter chamber 6
It is possible to effectively avoid a phenomenon in which the pair of filter cloths 5.5 forming filters a and 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. Moreover, since the gap holding members 4 and 11 can also secure a space between the pair of filter cloths 5 and 5 that sandwich the second filter plate 2.3, it is also possible to improve the discharge performance of the filtrate.

Note that the present invention is not limited to the above embodiments,
It can be performed for various other types of deafness.

For example, as shown in Figures 15 and 16, each stock solution supply port and stock solution supply hole of the second stock solution supply system H may be provided in the filtration method portion of the filter plate in the same way as the first stock solution supply system ① above. good. In this case, the first and second gap holding members 11 and 4
The stock solution is supplied from the second stock solution supply system (1) to each filter chamber 6b, but the arrangement order of the gap holding members 4 and 11 is made to be different from that of the first stock solution supply system I. do.

The filter plate shown in FIG. 15 is the second filter plate 19, and the filter plate shown in FIG.
Parts that perform the same functions as the filter plate 2 are given the same reference numerals and their explanations will be omitted. In the figure, 1912 is a filtrate recovery opening, and 19i is a communication hole that communicates the opening 19 (!) with 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 chamber (1) is disposed in the filter chambers disposed at both ends.

[BRIEF DESCRIPTION OF THE 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 Fig. 3.4.5 The figures show a front view, a cross-sectional side view, and a cross-sectional view of the filtrate collection port portion of the second filter plate 2 of the filter press, respectively. Figures 8 and 9 are a front view and a sectional side view of the 1'a plate, respectively, Figures 10.11 are a front view and a half sectional side view of the first gap retaining member, respectively, and Figures 12, 13, and 14 are a sectional side view of the first gap holding member, respectively. FIG. 15.16 is a plan view, a front view, and a half-sectional side view of the second gap holding member, and a front view and a cross-sectional side view of the second filter plate 19 according to another embodiment, respectively. l...first filter plate, 1a...first stock solution supply port, 1b...
...Second stock solution supply port, 1c, 2c...Frame, ld, 2
d...Handle, l e, 2 e...Slanted surface, If...
...Filtering bed, Ig, 2g...Protrusion, lh, 2h...
・Filtrate collection port, li, 2i...concave groove, lj...convex part, 1k, 2k, 3k...concave part, 2,3.1
9... Second filter plate, 2b, 3b... Second stock solution supply port,
2r...Space, 4...Second gap holding member, 4a...
・First stock solution supply port, 4b...convex part, 4c...concave part,
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, 11... First gap holding member, l1a... First stock solution supply port, 12.
...Patsukin, 12b, 13b, l 4b, 16
b...Stock solution supply port, 13...Mounting ring, 14...Stock solution supply plate, 14c...Stock solution supply passage, 15...Bolt, 16...Holding member, 17...Communication path , 18...
- Holding member, 2o... stock solution supply member. Patent applicant: Kurita Kikai Seisakusho Co., Ltd. Representative: Patent attorney: To Mr. Maeda and 2 others: To X

Claims (3)

[Claims] (1) Each filter bed (1f) is provided, and each filter bed (1f) is provided.
a pair of first filter plates (1, 1) each having a first stock solution supply port (1a) at a predetermined location and a second stock solution supply port (1b) at a predetermined location; 1) A frame body (
the second filter plate (2, 3) consisting of the filter plate (1, 2c);
2, 3), while the first filter plate (1)
A filter cloth having a first stock solution supply hole (5a) that can communicate with the first stock solution supply port (1a) of the filter cloth, and a second stock solution supply hole (5b) that can communicate with the second stock solution supply port (1b). (5), and a first stock solution supply system ( I ), and a second stock solution supply system (II) 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). , When tightening the filter plates, the pair of filter cloths (5, 5) between each of the filter plates
a first filtration chamber (6a), which is formed by a first filtration chamber (6a), and to which the stock solution is supplied from at least the first stock solution supply system;
The filter chambers (6) arranged between the first filter plates (1, 1) alternate with the second filter chambers (6b) to which the stock solution is supplied from the stock solution supply system.
), within the frame (2c) of the second filter plate (2, 3) and between a pair of filter cloths (5, 5) sandwiching the second filter plate (2, 3). , 5), and a stock solution supply port (4a) communicating with the first stock solution supply hole (1a) of the filter cloth (5).
and the adjacent first stock solution supply system (I
) A gap holding member (
4), and by mutually changing the pressure of the stock solution supplied to the filter chambers (6a, 6b) in both stock solution supply systems (I, II), the filter chamber (6a, 6b) on the high pressure side
The filter cloth (5) forming the filter chamber (6) expands to form the filter chamber (6) on the low pressure side.
) A filter press characterized in that filter sludge in ) is pressed to perform compression filtration. (2) Each of the above filter plates (1, 2, 3) has a frame body (1c,
2c) has the second stock solution supply port (1b, 2b, 3b) of the second stock solution supply system (II), and the filter plate (
1, 2, and 3), the frame of a predetermined filter plate has the second stock solution supply port (1b, 2b, 3b) and the second filter chamber (6b).
The filter press according to claim 1, further comprising a stock solution supply communication path (14c) that communicates with the filter press. (3) The filter chamber (6) has two first filter chambers (6a) and two
Claims 1 or 2, wherein a plurality of second filter chambers (6b) are arranged alternately between the first filter chambers (1, 1). filter press.