JPH0411907A - Pressing filter plate - Google Patents

Abstract

PURPOSE:To prevent the compressing fluid of a pressing membrane from leakage by fixing filter cloth to a pressing filter plate with filter cloth fixing members so that the raw liquid port of filter cloth is communicated with the raw liquid port of pressing membrane and the raw liquid port of filter plate main body. CONSTITUTION:The raw liquid port 1k of the pressing membrane 1 is coincided and communicates with the raw liquid port 3k of the filter plate main body 3, and the pressing membrane 1 is fixed to the filter plate main body 3 by pressing membrane fixing members 21. The filter cloth 8 is so fixed to the pressing filter plate with filter cloth fixing members 19 that the raw liquid port 8k of the filter cloth 8 is coincided and communicates with the raw liquid port 1k of the pressing membrane 1 and the raw liquid port 3k of the filter plate main body 1. By this method, the filter cloth 8 and the filter membrane 1 are not dislocated to the filter plate main body 3 during filter process or the transfer of filter plate, and surely kept in the specified position, and the leakage of the compressing liquid of the pressing membrane 1 is effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION 11.5.1 The present invention provides a method for fixing a compressed membrane to a filter plate body so that the raw solution port of the compressed membrane and the raw solution port of the filter cloth are communicated with the raw solution port of the filter plate body. This invention relates to a compressed filter plate.

Conventional technology Conventionally, compressed membranes are arranged on both sides of a filter plate body, and the compressed membranes are attached to the filter plate body with bolts or the like to constitute a compressed filter plate, and the compressed filter plates are arranged between front and rear stands. A press filter press is known in which a pair of filter cloths are sandwiched between adjacent filter plates, and a stock solution is supplied between the pair of filter cloths to expand the press membrane to perform press filtration. In this compressed filter plate, when fixing the compressed membrane to the filter plate main body, the concentrated liquid inlet of the compressed membrane, the concentrated liquid inlet of the filter plate main body, and the concentrated liquid inlet of the filter cloth are aligned and positioned using a ring-shaped retaining plate. There is something that is fixed.

However, with the structure described above, when positioning the liquid inlet of the filter cloth to the liquid inlet of the squeezing membrane or the filter plate body, there is not much squeezing force acting on the filter cloth itself, so the filtration is difficult. As a stop plate for positioning and attaching the cloth, its rigidity can be reduced, but since the filter cloth is positioned and fixed to the filter plate body together with the compressed membrane, the stop plate that positions them integrally is a compressed membrane. There was a problem in that it needed to be highly rigid to withstand pressure.

Therefore, an object of the present invention is to solve the above-mentioned problem, and to be able to reliably position and hold the stock solution port of the pressing membrane and the stock solution port of the filter cloth with respect to the stock solution port of the filter plate main body, To provide a compressed filter plate which can reduce the rigidity of a member for positioning the raw solution port of a filter cloth to the raw solution port of a compressed membrane and can be easily attached.

Means for Solving the Problems In order to achieve the above object, the present invention provides a member for fixing a positioning member for a stock solution port so that the stock solution port of the compressed membrane communicates with a stock solution port of the filter plate main body, and The filter plate is configured to be separated from a member attached to communicate the stock solution port with the stock solution port of the filter plate main body. That is, in a compressed filter plate having a filter plate main body having a stock solution port and a squeeze membrane having a stock solution port that covers the surface of the filter plate main body and communicates with the stock solution port of the filter plate main body, the stock solution of the filter plate main body can be a compressed membrane fixing member that is fixed so as to communicate the opening of the compressed membrane with the raw solution port of the compressed membrane, and a filter that is attached to the fixing member and that connects the filter cloth raw solution port with the raw solution port of the compressed filter plate. and a filter cloth attachment member for attaching a cloth.

Further, in the above configuration, the compressed membrane fixing member has a flange on its outer periphery, and the compressed membrane is held between the surrounding area of the concentrate opening and the surrounding area of the concentrate opening of the filter plate main body by the flange. At the same time, a protrusion is formed on the filter plate main body side in a portion surrounding the concentrate opening of the compressed membrane, and a recessed portion with which the protrusion engages is formed in a portion surrounding the concentrate opening of the filter plate main body. You can also.

Effects and Effects of the Invention According to the above configuration, the compressed membrane is fixed to the filter plate body by the compressed membrane fixing member with the raw solution port of the compressed membrane communicating with the raw solution port of the filter plate body, and the concentrated solution of the filter cloth is fixed to the filter plate body. Since the filter cloth is attached to the compressed filter plate using a filter cloth attachment member so that the opening communicates with the raw solution port of the compressed membrane and the raw solution port of the filter plate body, the filter cloth can be attached during filtration work or when moving the filter plate. The compressed membrane and the compressed membrane do not shift relative to the filter plate main body, are reliably positioned and held at a predetermined position, and leakage of compressed fluid from the compressed membrane can be effectively prevented. In addition, the squeezing pressure acts on the squeezing membrane fixing member, and the pressure due to the expansion of the squeezing membrane does not act on the filter fabric mounting member that attaches the filter cloth to the filter plate body, so the rigidity of the filter fabric mounting member itself can be reduced and the The means for attaching the parts can also be simple.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 6.

As shown in the left half of FIG. 1, the compressed filter plate 2 according to this embodiment includes a filter plate main body 3 having a raw solution port 3k, and covers each front and rear surface of the filter plate main body 3 and covers the filter plate main body 3. 3 stock solution port 3
The filter plate main body 3 has a roughly square-shaped squeeze membrane 1 having a stock solution port 1k communicating with the stock solution port 3 of the filter plate body 3.
A compressed membrane fixing member 21 that connects and fixes the compressed membrane l to the stock solution port 1 of the compressed membrane l, and a filter cloth 8 attached to the fixing member 21 and connected to the stock solution port 3k and Ik of the compressed filter plate 2. and a filter cloth attachment member 19 to which the filter cloth 8 is attached by communicating the raw solution port 8k of the filter cloth.

In addition, since the compressed filter plate 2 is bilaterally symmetrical, only the left half thereof is illustrated. Also in Figure 2.4.5 below,
Since each filter plate, each pressed membrane fixing member, and each filter cloth mounting member are symmetrical, only one portion is illustrated.

The main body 3 has a stepped portion 3n formed inside a square outer frame 3a whose lower end center portion curves downward and protrudes, and further includes a filter portion 3b having a square recess at a portion corresponding to the filter portion inside the step portion 3n. Form. Laterally projecting ears 3d, .

Form 3 e, 3 h, 3 h. In the left half of FIG. 1, each through hole 3h of each ear portion 3d at the upper left side and lower right side (not shown) of the main body 3 communicates with each opening 3j arranged in the filter section 3b of the main body 3. 31 to form a compressed fluid supply path that communicates with the compressed fluid supply chamber formed between the back surface of the compressed membrane 1 and the surface of the filtration part 3b of the filter plate main body 3. Further, each through hole 3e of each ear portion 3d at the lower left side and upper right side (not shown) of the main body 3 is connected to the frame portion 1 of the compressed membrane l disposed inside the outer frame 3a of the main body 3.
A filtrate recovery path is configured by connecting each opening 1g of the inclined surface In of a with a connecting path 3f. Furthermore, a handle 3Q is formed on each side of the main body 3, and each handle 3g
are slidably mounted on each guide rail 18 arranged in parallel in the front-rear direction of the filter press, and each pressing filter plate 2 is suspended and supported by the pair of guide rails 18.18. Main body 3 above
A stock solution port 3k is formed to pass through a portion of the lower end of the filtration portion 3b that protrudes downward from the center portion. As shown in FIG. 2.3, an annular recess 3c is formed around the stock solution port 3 at a predetermined distance apart, and a thin annular groove 3m is further formed outside the recess 3c.

On the other hand, each of the compressed membranes 1 has a frame portion 1a whose lower end central portion of a square frame projects downward in a U-shape, and a frame portion 1a.
A filtration surface 1b in which a large number of filtrate recovery grooves are formed at positions corresponding to the square recesses of the filter plate main body 3 disposed therein.
It is made of an elastic material such as rubber. Moreover, the filtration surface tb of the compressed membrane 1 is arranged so as to cover the filtration section 3b on each front and rear surface of the main body 3 and the stepped section 3n around the filtration section 3b. The frame portion 1a is fitted inside the frame portion 1a of the filter plate main body 3 and attached with a plurality of bolts (not shown) or the like. Various known methods can be used to connect the compressed membrane 1 to the filter plate main body 3. A raw solution port 1k is formed to penetrate through a portion of each compressed membrane I that projects downward from the center of the lower end of the filtration surface 1b. This stock solution port 1 has a larger inner diameter than the stock solution port 3 of the filter plate main body 3, and an annular recess 1c is formed on the outer surface around the stock solution port 1, with which the compressed membrane fixing member 2I engages. At the same time, an annular projection 1m is formed on the inner surface around the stock solution port 1, so that the projection 1m can be engaged in the annular groove 3m of the filter plate main body 3.

The compressed membrane fixing member 21 is made of a ring-shaped plate made of metal or synthetic resin, and has a flange 21a formed on its outer periphery.
At the same time, the part other than the flange 21a is fitted into the stock solution port 1k of the compressed membrane l, and this part has a through hole 21k that communicates with the stock solution port 3k of the filter plate main body 3. The fixing member 21 fitted to this compressed membrane 1 is a compressed membrane l
After aligning and communicating the stock solution port 1k with the stock solution port 3k of the filter plate main body 3, the bolt 5 passing through the fixing member 21...
, 5 into the screw hole 3g around the stock solution port 3 of the filter plate main body 3.
3g to attach the fixing member 21 to the filter plate main body 3. A compressed membrane l is sandwiched between the flange 21a of this fixing member 21 and the filter plate main body 3, and each bolt 5
Since the pressed membrane 1 is not present in the part where the fixing member 21 is directly fastened to the filter plate main body 3, that is, in the part other than the flange, the bolt 5. . . , the compressed membrane 1 is not damaged by the tightening of 5.

The filter cloth mounting member 19 is a ring-shaped plate made of metal or synthetic resin, and the filter cloth mounting member 1
9 are screwed into the through holes 21 of the compressed membrane fixing member 21 to attach the filter cloth mounting member 1.
9 is attached to the compressed membrane fixing member 21. In this attached state, the through hole 19k of the filter cloth mounting member 19 and the stock solution port 8 of the filter cloth 8 communicate with the through hole 21 of the compressed membrane fixing member 21 and the stock solution port 3 of the filter plate body 3.

On the other hand, as shown in the right half of FIG. 1, the normal filter plate 4 has an inclined surface 4n formed inside a square cedar plate-shaped outer frame 4a, and further has a square shaped slanted surface 4n on the inside thereof. A filtering surface 4b having a recess in which a recovery groove is formed is formed. At each corner of this normal filter plate 4, similar to the filter plate main body 3,
Laterally protruding ears 4d, . . . , 4d are integrally formed, and a penetrating hole 4e is formed in each ear 4d. Further, the through holes 4e of the lower left side (not shown) and the upper and lower right ears 4d of the normal filter plate 4 are connected to the openings 4g of the filter surface 4b near the outer frame 4a of the normal filter plate 4. 4f to form a filtrate recovery path that communicates with the hole 4e through which the ear portion 4d of the normal filter plate 4 passes. In addition, the above-mentioned normal filter plate 4
The through hole 4e of the ear portion 4d at the upper left side (not shown) constitutes a compressed fluid supply path communicating with the hole 3h through which the ear portion 3d of the compressed filter plate 2 passes.

In addition, handles 4Q are formed on each side of the normal filter plate 4, and each handle 4Q is slidable on each guide rule 18 arranged in parallel in the front and back direction of the filter press. The filter plates 4 are placed on a pair of guide rails 18.
．． It is suspended and supported by 18. A stock solution port 1k of the compressed filter plate 2 is provided in a portion projecting downward from the center of the lower end of the filtering surface 4b of the normal filter plate 4.

A stock solution port 4k communicating with 3k is formed.

Further, when attaching the filter cloth 8 to the stock liquid port 4k of the normal filter plate 4, the ring-shaped filter cloth attaching member 19 is used. Above filter cloth mounting member! 9 penetrates the filter cloth mounting member 19 with the stock solution port 8k of the filter cloth 8 aligned with and communicating with the stock solution port 19k of the filter cloth mounting member 19, as in the case of the compressed filter plate 3. The bolts 6, . . . , 6 are inserted into the through holes 4g, . . . , 4g around the stock solution port 4 of the normal filter plate 4
The filter cloth attachment members 19 are normally attached to the filter plate 4 by screwing them into the respective holes.

In this attached state, the stock solution port 4 of the filter plate 4 normally communicates with the stock solution port 8 of the filter cloth 8 and the through hole 19 of the filter cloth mounting member 19.

According to the above configuration, for example, a pair of guide rails 18.
18, and a movable plate (not shown) is tightened toward the front stand by driving a drive device of the rear stand (not shown). In this tightened state, each filter plate 2
, 4 between the pair of filter cloths 8, 8, from the stock solution supply pipe (not shown) of the front stand to the stock solution ports 3k, 4k of each filter plate 2.4.

The filter cloth mounting member 19 is inserted into the through hole 21 of the compressed membrane fixing member 21.
Filtration is performed by supplying the stock solution into the filter chamber 20 between the pair of filter cloths 8.8 through the through hole 19k and the stock solution port 8k of the filter cloth 8. After the stock solution supply operation has been carried out for a predetermined period of time, or when a predetermined amount of stock solution has been supplied, compressed fluid, for example, compressed air, is supplied from the supply pipe to the compressed filter plate 2 through the compressed fluid supply path. The squeeze membrane 1 is expanded. That is, compressed fluid is supplied to the compressed fluid supply chamber between each compressed membrane 1 and the filter plate main body 3, and the compressed membrane 1 is expanded. At this time, the portion of the compressed membrane l around the raw solution port 1 also tries to expand, but the expansion is regulated because it is clamped and fixed between the compressed membrane fixing member 21 and the filter plate main body 3. A fixed state is maintained. Due to the expansion of the compressed membrane 1, the cake held between the filter cloths 8.8 is compressed and filtered. The filtrate discharged in the filtration and press filtration is collected in the filtrate recovery path and discharged from the filtrate recovery pipe (not shown). When the predetermined filtration work is completed, the movable plate is moved to the rear stand side by the drive of the drive device, and then the filter plates 2 and 4 are individually opened,
The cake held between the filter cloths 8.8 is dropped downward and collected. Each filter cloth 8 is supported by a known suspension support mechanism, for example, a filter cloth suspension whose lower end is suspended by a spring from a pin connecting the upper end of an arm pivotally connected to each handle 312.49 of each filter plate 2.4. supported by rods. Therefore, the filter cloth 8.8 is vibrated due to the vibration when the filter plate 2.4 is opened, the driving of a vibration imparting device (not shown), etc., and the cake is peeled off from the filter cloths 8, 8 and falls. After collecting the cake, the filter cloth 8.8 is washed by a washing device if necessary. When the cleaning operation is completed, the filter plate 2.4 is tightened again for the next filtration operation.

According to the above embodiment, the compressed membrane l is fixed to the filter plate main body 3 by the compressed membrane fixing member 21 with the raw solution port 1k of the compressed membrane 1 aligned with and communicated with the concentrated solution port 3k of the filter plate main body 3. At the same time, the stock solution port 8k of the filter cloth 8 is connected to the stock solution port 1 of the compressed membrane l.
Since the filter cloth 8 is attached to the compressed filter plate with the filter cloth attachment member 19 so as to be aligned and communicated with the stock solution port 3k of the filter plate main body 3, the filter cloth 8 can be attached during filtration work or when moving the filter plate. 8 and the compressed membrane 1 do not shift relative to the filter plate main body 3, and are reliably positioned and held at a predetermined position, and leakage of compressed fluid from the compressed membrane 1 can be effectively prevented.

In addition, the squeezing pressure acts on the squeezing membrane fixing member 21, and the filter cloth 8
Since the pressure due to the expansion of the compressed membrane 1 does not act on the filter cloth attachment member 19 that attaches the filter cloth attachment member 19 to the filter plate main body 3, the rigidity of the filter cloth attachment member 19 itself is small and the means for attaching the member 19 is simple. It can be done.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways. For example, in the above embodiment, the compressed filter plates 2 and the normal filter plates 4 are arranged alternately, but the filter press may be constructed from only the compressed filter plates 2. In addition, each compressed filter plate 2 and the normal filter plate 4 are not limited to those in which the opening of the stock solution is protruded downward, but the opening of the stock solution may be arranged within the filtration surface, or may be arranged so as to protrude above the filtering surface. The stock solution port may be positioned differently.

Also, the stock solution port 8 to which the filter cloth mounting member 19 is attached is provided.
A reinforcing material may be provided around the undiluted solution opening 8 of the filter cloth 8 to reinforce the periphery thereof.

Also, the compressed membrane fixing member 21 and the filter cloth mounting member! 9 is not limited to the structure described above, but may have a structure as shown in FIGS. 4 to 6, for example. That is, in FIGS. 4 to 6, in the pressing filter plate 2, a ring-shaped pressing membrane made of metal or synthetic resin is attached to the portion of the filter plate main body 3 at the undiluted solution opening 3, and the portion of the pressing membrane 1 at the undiluted solution opening 1. The fixing member 13 fixes them so that they communicate with each other. A flange 13a is formed on the outer periphery of this compressed membrane fixing member 13, and the flange 13a is engaged with the annular recess 1c of the compressed membrane I, and the portion other than the flange +3a is fitted into the raw solution opening 1k of the compressed membrane I. At the same time, this portion has a through hole 13k that communicates with the stock solution port 3k of the filter plate main body 3. The fixing member 13 fitted to the compressed membrane l is connected to a bolt 14 which passes through the fixing member 13 after aligning and communicating the raw solution opening 1k of the compressed membrane I with the raw solution opening 3k of the filter plate main body 3. . . , 14 are screwed into the perforated holes 3g, . A compressed membrane cover is sandwiched between the flange 13a of the fixing member 13 and the filter plate main body 3, and each bolt 5 connects the upper 5 to the fixing member 1.
3 is directly tightened to the filter plate main body 3, that is, there is no compressed membrane l in the part other than the flange, so the bolt 1
4. . . , the compressed membrane l is not damaged by the tightening of 14. Further, the filter cloth attachment member 9 made of metal or synthetic resin is a roughly U-shaped plate material, and the filter cloth attachment member 9 is placed in a state where its through hole 9k is aligned with and communicates with the stock solution opening 8k of the filter cloth 8. The filter cloth mounting member 9 is attached to the compressed membrane fixing member 13 by screwing the bolts lO3 . In this attached state, the through hole 9k of the filter cloth mounting member 9 and the stock solution port 8 of the filter cloth 8 communicate with the through hole 13 of the compressed membrane fixing member 13 and the stock solution port 3 of the filter plate body 3. Above U
The letter-shaped filter cloth attachment member 9 has a recess 9a formed in its upper part,
A protrusion 9b through which the bolt 10 passes is formed in the center of the recess 9a. This recess 9a constitutes a stock solution supply path for supplying the stock solution that has passed through each stock solution port into the filter chamber. Normally, for the filter plate 4, the filter cloth mounting member 9 is
A filter cloth mounting member 11 made of metal or synthetic resin is provided as a filter cloth mounting member 11 which has the same structure as 12. but is slightly larger in size and shape. ... Attach to the normal filter plate 4 at 112 to connect the stock solution port 8 of the filter cloth 8 and the stock solution port 4 of the normal filter plate 4. In this embodiment as well, the same effects as in the previous embodiment can be achieved.

Furthermore, the compressed membrane 1 is not limited to a single rubber sheet, but may be a bag.

[Brief explanation of the drawing]

1.2, the left half is a front view and an enlarged front view of essential parts of a compressed filter plate according to an embodiment of the present invention, and the right half is a front view and an enlarged front view of essential parts of a normal filter plate, and Figure 3 is a cross-sectional side view of the main parts of the compressed filter plate and the normal filter plate shown in Figures 1.2 and 3. Figure 4.5 shows the left half of the compressed filter plate and the normal filter plate shown in the tightened state. A front view and an enlarged front view of the main parts of a compressed filter plate according to another embodiment, the right half is a front view and an enlarged front view of the main parts of a normal filter plate, and FIG. 6 is the same as shown in FIG. 4.5, respectively. It is a sectional side view of the main part in a state in which the pressing filter plate and the above-mentioned normal filter plate are tightened. G... Pressed membrane, 1 k, 2 k, 3 k... Stock solution port, 2... Pressed filter plate, 3... Filter plate body, 4... Ordinary filter plate, 5, 6, 10° 14... Bolt, end... Filter cloth, 9.19... Filter cloth mounting member, 9, 13k, 19, 21k... Through hole, 13.21... Pressing membrane fixing member. Patent applicant: Kurita Kikai Seisakusho Co., Ltd. Patent attorney Aoyama Hajime and two others Figure 3

Claims (2)

[Claims] (1) A filter plate main body (3) having a stock solution port (3k), and a stock solution port (1k) that covers the surface of the filter plate main body (3) and communicates with the stock solution port (3k) of the filter plate main body (3). ) with a compressed membrane (
1), the compressed filter plate (2) has a stock solution port (3k) of the filter plate main body (3) and the compressed membrane (1).
) and a compressed membrane fixing member (21) that is fixed so as to communicate with the stock solution port (1k) of the filter plate (2), and a filter that is attached to the fixing member and is connected to the stock solution port (3k, 1k) of the compressed filter plate (2). The filter cloth (8) is connected so that the stock solution port (8k) of the cloth (8)
) A filter cloth mounting member (19) to which a filter cloth mounting member (19) is mounted. (2) The compressed membrane fixing member (21) has a flange (21a) on its outer periphery, and the flange (21a) allows the compressed membrane (1) to have a portion surrounding the stock solution port (1k) in the filter plate body. (3), and a protrusion (1m) is formed on the side of the filter plate body in the area surrounding the concentrate opening (1k) of the compressed membrane (1). , the protrusion (1) is located around the stock solution port (3k) of the filter plate body (3).
2. The pressing filter plate according to claim 1, wherein a recess (3m) is formed in which the filter member (m) engages.