JPH0691111A - Compression filter plate for compression filter press - Google Patents

Abstract

PURPOSE:To provide compression filter plates useful for compression filter presses where filtration holes of the filter plate are prevented from being clogged by filtration pressure and the filter cloth of the filter press does not enter the filtration holes. CONSTITUTION:Filtion hole holding members 5 are inserted into the filtration holes 3e of a compression membrane 3 which is overlaid on a core plate 1 to prevent the filtration holes 3e from being clogged so that the discharge of liquid filtrate for giving filtration dehydration in high pressure is smoothly secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeeze filter plate in a squeeze filter press which performs squeezing and squeezing using a squeeze film.

[0002]

2. Description of the Related Art Conventionally, various types of press filter plates for press filter presses of this type are known. For example,
The squeeze filter plate has a squeeze membrane disposed on the front and back sides of the core plate, filtrate holes are formed at both corners of the lower part of the squeeze film, and the filtrate hole and the filtrate hole of the core plate are connected by a communication hole to perform filtration. It is constructed so that the filtrate that sometimes flows out from the filtration chamber to the surface of the squeeze membrane can be collected along the surface of the squeeze membrane to the lower part and discharged from the filtrate hole of the squeeze film to the filtrate hole of the core plate through the communication hole. There is.

[0003]

However, in the structure described above, since the squeezing membrane itself is formed of an expandable elastic material, the filtration pores of the squeezing membrane are displaced by the filtering pressure during filtration, and the core plate of the slab is displaced. Filtrate hole 3
There is a problem that e is clogged and the filtrate cannot be discharged smoothly, and a part of the filter cloth gets into the filtrate hole of the squeeze membrane, which makes it difficult to carry out the filtering operation smoothly. there were. Therefore, an object of the present invention is to solve the above problems, and for a squeezing filter press that can prevent clogging of the filtrate holes even by filtration pressure, and that prevent the filter cloth from entering the filtrate holes. The object is to provide a press filter plate.

[0004]

In order to achieve the above object, the present invention is to prevent a clogging of a filtrate hole by inserting a filtrate hole holding member into the filtrate hole of a compressed membrane laminated on a core plate. Is configured to smoothly ensure the discharge of the filtered liquid that is filtered and dehydrated under high pressure. That is, in the squeezing filter plate for a squeezing filter press having a core plate and a squeezing membrane, the squeezing membrane having a filtrate hole, the squeezing membrane can be inserted into the filtrate hole of the squeezing membrane, and the filtrate passage is provided therein. A tubular portion having a filtrate passage hole that communicates the filtrate passage with the surface of the squeezed membrane, and is formed at the end of the tubular portion to form a surface substantially flush with the surface of the squeezed membrane when the filter plate is tightened. It is possible, and is provided with a collar portion that closes the opening of the filtrate passage of the tubular portion and is capable of contacting the periphery of the filtrate hole of the squeezed membrane, and the outer peripheral surface of the tubular portion and the filtrate hole of the squeezed membrane. The filtrate hole holding member is provided with an engaging projection on one of the inner peripheral surfaces thereof and an engaging recess engaging with the engaging projection on the other.

According to the above construction, both the engaging projection and the engaging recess may be annular so that they can be brought into close contact with each other during engagement. In the above configuration, a column portion may be provided upright around the filtrate hole of the squeeze membrane, and the collar portion of the filtrate hole holding member may abut on the column portion. In the above configuration, the squeeze membrane may be configured such that a surrounding portion surrounding the flange portion of the filtrate hole holding member is formed in a portion around the filtrate hole.

[0006]

According to the structure of the present invention, the filter cloth hole holding member is fitted into the filtrate hole of the squeeze membrane, and the filtrate passage is secured by the cylindrical portion of the member. It is possible to prevent the filtrate holes from being misaligned and entering the filtrate holes of the core plate and clogging the filtrate holes. Moreover, since the filtrate member of the compressed film can be reinforced by the holding member, the pressure of the compressed fluid can be prevented from being concentrated on the filtrate hole part of the compressed film and the filtrate can be applied to the back side of the compressed film. It can also be prevented from going around. Further, the holding member is fitted into the filtrate hole of the squeezing membrane, and the flange portion closes the opening of the filtrate hole in the thickness direction of the filter plate. The filter cloth can be prevented from entering and the damage to the filter cloth can be prevented. In addition, by engaging the engaging projection with the engaging recess of the holding member and the compressed film, it is possible to effectively prevent the holding member from being separated from the filtrate hole. Therefore, the holding member of the compressed film can be easily attached and removed from the compressed film without using a tightening tool such as a bolt and a nut.

If both the engaging projection and the engaging recess are annular so that they can be brought into close contact with each other at the time of engagement, a sealing effect for the compressed fluid and the stock solution can be provided at this portion. Moreover, if the back surface of the collar portion of the holding member is abutted and supported by the column of the compressed film, it is stably supported by the compressed film even when filtration pressure is applied. Further, in the compressed membrane, if a surrounding portion surrounding the flange portion of the filtrate hole holding member is formed in a portion around the filtrate hole, the collar portion may move along the surface of the compressed membrane. It can be effectively regulated by the surrounding portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to FIGS.
It will be described in detail based on. As shown in FIG. 1, a squeeze filter plate 6 for a squeeze filter press according to the present embodiment includes a core plate 1 made of a rigid body such as a casting and a squeeze film 3 made of an elastic material such as rubber. 3 has filtrate holes 3e at the lower corners thereof. The core plate 1
Has a frame portion 1a around the filtering portion 1b via an inclined portion 1c, and ears 1e, ..., At each corner of the frame portion 1a.
Has 1e. In FIG. 1, one compressed fluid supply hole 3 is provided in the inclined portion 1c at the upper left corner of the frame portion 1a of the core plate 1.
In addition to forming r, the compressed fluid supply hole 1k of the ear 1e at the upper left corner communicates with the supply hole 3r through the communication hole 1j. Further, in the core plate 1, a through hole 1m is formed in the ear portion 1e at the lower left corner of the frame portion 1a, and a stock solution hole 1n is formed in the center of the filtering portion 1a of the core plate 1. . In FIG. 1, 1d is a handle for suspending and supporting the filter plate on a guide rail (not shown). In addition, FIG. 1 shows the front surface of the squeezing filter plate 6 on which the filter cloth 2 is hung.
It is notched at the communication part that passes through n and connects with the squeezing membrane 3 on the back side, and the filter cloth 2 is also shown as notched.

The squeeze membranes 3 arranged on the front and back sides of the core plate 1 have a filtering part 3b, an inclined part 3c and a frame part 3a corresponding to the core plate 1, and the stock solution holes 1n of the core plate 1. Has a stock solution hole 3n communicating with the center of the filtration unit 3b. The filtration unit 3b has a large number of prisms 3 in order to smoothly discharge the filtrate.
g, ..., 3 g are erected. In FIG. 1, the squeeze film 3
In the upper right corner of the frame portion 3a, a recess 3d is formed which is continuous from the inclined portion 3c, and two filtrate holes 3e, 3e penetrating the compressed film 3 are formed in the recess 3d, and both of these filtrate holes are formed. Communication holes 1f, 1f of the core plate 1 in 3e, 3e
The through hole 1g of the ear portion 1e at the upper right corner of the core plate 1 communicates with each other through. Similarly, in the lower right corner of the frame 3a of the squeeze film 3, a recess 3d continuous from the inclined portion 3c is formed, and two filtrate holes 3e, 3e are formed in this recess 3d, and both filtrate holes 3e, 3e to the communication hole 1 of the core plate 1
The filtrate holes 1i of the ear portion 1e at the lower right corner of the core plate 1 communicate with each other via h and 1h.

On the surface side of each compressed film 3, a filter cloth 2 is provided.
Are arranged. The filter cloth 2 has a stock solution hole 2n communicating with the stock solution holes 1n and 3n.

On the other hand, the filtrate hole 3e of the squeezing membrane 3 and its peripheral portion are, as shown in FIGS.
And an annular engaging projection 3j is formed on the outer peripheral surface of the elliptical projection 3i to fit the elliptical projection 3i in the recess 1p of the core plate 1 and the inner peripheral surface of the recess 1p. The oval protrusion 3i of the squeeze film 3 is provided in the engaging recess 1q formed in a ring shape.
The squeezing membrane 3 is fitted and fixed to the core plate 1 by engaging the engaging convex portion 3j of. Further, on the surface of the compressed film 3, the filtrate hole 3 is formed at the end of the recess 3e continuous from the inclined portion 3c.
Two curved concave portions 3h and 3h are formed corresponding to e and 3e. Then, a filtrate hole holding member 5 is fitted into each filtrate hole 3e of the compressed film 3 to hold the filtrate hole 3e so that the filtrate hole 3e does not become clogged.

As shown in detail in FIG. 4, the filtrate hole holding member 5 has a filtrate passage 5e in the central portion thereof, and the filtrate passage holes 5c, ..., 5 communicating the filtrate passage 5e with the surface of the compressed membrane.
and a cylindrical thick-walled cylinder portion 5b having c, and a flange portion formed at an end portion of the cylinder portion 5b and capable of closing the opening of the cylinder portion 5b and abutting on a portion around the filtrate hole of the compression membrane 3 5a and 5a are integrally provided. The holding member 5 is preferably integrally formed of hard rubber such as ebonite, or is formed by covering the circumference of a cylindrical core metal with rubber. Further, the holding member 5 has an annular engagement protrusion 5d on the outer peripheral surface of the cylindrical portion 5b.
On the other hand, an engaging recess 3k that engages with the engaging projection 5d is formed on the inner peripheral surface of the filtrate hole 3e of the compressed film 3. Further, the collar portion 5a has no hole and prevents the filter cloth 2 from entering the filtrate hole 3e, and its surface can be formed substantially flush with the surface of the squeeze membrane 3 when the filter plate is tightened. Is arranged as. On the back surface of the collar portion 5a, a large number of columns 3f, ..., 3f provided upright around the filtrate hole 3e of the squeeze membrane 3 are supported by contact. The cylinders 3f, ..., 3f are formed on the inclined portion 3c other than this portion, but the cylinder 3 of the inclined portion 3c.
Since the column 3f around the filtrate hole 3e is lower than the column f by the thickness of the collar portion 5a of the holding member 5, the surface of the collar portion 5a at the time of tightening the filter plate is adjacent to the portion of the squeeze film 3 which is adjacent. It is formed to be substantially flush with the surface.

Therefore, the holding member 5 has a cylindrical portion 5b.
Is inserted into the filtrate hole 3e of the squeeze film 3 from the front end side of the squeeze film 3 to engage the engagement protrusion 5d of the holding member 5 with the engagement recess 3k of the squeeze film 3 and squeeze the back surface of the collar portion 5a of the holding member 5. Membrane 3
, 3f around the filtrate hole 3e in FIG. In this supported state, the tip of the tubular portion 5b of the holding member 5 penetrates the filtrate hole 3e of the squeeze membrane 3 and slightly enters the through hole 1r of the core plate 1.

Further, as shown in FIG. 3, a squeezing filter press is constructed by alternately arranging the squeezing filter plates 6 and the ordinary filter plates 7 having the above-mentioned structure. Ordinary filter plate 7
Has a filtrate hole 7j that communicates with the filtrate hole 1j of the core plate 1 of the squeezing filter plate 6 and a communication hole 7h that communicates with the filtrate hole 7j, and like the core plate 1, the filter part 7a and the inclined part 7c. ,
In addition to having a frame portion 7b, filter cloths 2 and 2 are arranged on both front and back surfaces of the normal filter plate 7. Therefore, one filter cloth 2 on the side of the ordinary filtration plate 7 and one filter cloth 2 on the side of the compression filtration plate 3
A filter chamber 8 is formed between In addition, in FIG.
10 is a packing provided on the squeeze filter plate 6 and the normal filter plate 7, respectively.

In the squeezing filter press having the above construction, as shown in FIG. 3, after squeezing the squeezing filter plates 6 and the ordinary filter plates 7 in an alternating arrangement, the undiluted liquid is fed through the undiluted liquid holes into the respective filtration chambers 8. Feed in to start filtration. At the time of tightening the filter plate, the surface of the collar portion 5a of the holding member 5 forms substantially the same surface as the surface of the adjacent compressed membrane 3. The filtrate flowing out from the filter cloth 2 to the pressing and filtering plate 6 side flows between the columns 3f and 3f on the surface of the pressing membrane 3, and the holding member fitted in the filtrate hole 3e so as to communicate with the columns 3f and 3f. , 5c into the filtrate passage 5e of the tubular portion 5b, and then into the filtrate hole 1j through the communicating hole 1h of the core plate 1. On the other hand, the filtrate flowing out to the normal filtration plate 7 side enters the filtrate hole 7j from the surface of the normal filtration plate 7 through the hole 7e and the communication hole 7h.

According to the above embodiment, the filtrate holes 3 of the squeeze membrane 3
Since the holding member 5 made of hard rubber or the like is fitted to e and the filtrate passage is secured by the cylindrical portion 5b, the filtrate hole portion of the squeeze membrane 3 is displaced and enters the filtrate hole of the core plate 1,
It is possible to prevent the filtrate holes 3e from being clogged. Since the holding member 5 can reinforce the filtrate hole portion of the squeeze membrane 3, the pressure of the squeezing fluid can be prevented from concentrating on the filtrate hole portion of the squeeze membrane 3 and the filtrate squeezed. It can also be prevented from wrapping around the back side of the film. Further, the holding member 5 is fitted into the filtrate hole 3e of the squeeze membrane 3, and the flange portion 5a closes the opening of the filtrate hole 3e in the thickness direction of the filter plate. 2 does not enter the inside of the filtrate hole 3e, and damage to the filter cloth 2 can be prevented. Further, the holding member 5 engages the engaging projection 5d with the engaging recess 3k formed on the inner peripheral surface of the filtrate hole 3e of the compressed film 3,
It is possible to effectively prevent the holding member 5 from coming off from the filtrate hole 3e. Therefore, the holding member 5 of the compressed film 3 can be easily attached and removed from the compressed film without using a tightening tool such as a bolt and a nut. Further, the collar portion 5 a of the holding member 5 is the column 3 of the compressed film 3.
Since the back surface is abutted and supported by f, ..., 3f, it is stably supported by the squeeze membrane 3 even when a filtering pressure is applied. Further, when the annular engagement protrusion 5d of the holding member 5 engages with the annular engagement recess 3k of the filtrate hole 3e of the squeeze membrane 3, both closely contact in an annular shape, so that the compressed fluid and the undiluted solution are in contact with this portion. It can provide a sealing effect. Such an effect can be exerted also between the annular convex portion of the compressed film 3 and the annular concave portion 1q of the concave portion 1p of the core plate 1.

The present invention is not limited to the above embodiment, but can be implemented in various other modes. For example,
An engaging recess is formed in the tubular portion 5b of the holding member 5, and
You may make it form the engagement protrusion which engages in the engagement recess in the squeeze film 3. Alternatively, the engaging protrusion and the engaging recess may be formed in each of the holding member 5 and the squeeze film 3 so that they are engaged with each other. Further, the number of engaging projections and engaging recesses is not limited to one, and may be arbitrary. In addition, the column 3f that abuts and supports the collar portion 5a of the holding member 5 has the compressed film 3
Instead of forming it on the side, it may be formed on the back surface of the collar portion, and the end surface thereof may be brought into contact with the surface of the compressed film 3 and similarly supported. Alternatively, a column may be formed on both the collar portion 5a and the squeeze membrane 3 so that they are brought into contact with each other. Further, the column 3f is not limited to a circular column, but may be a column of any shape such as a prism. Further, the collar portion 5a of the holding member 5
May have small holes to the extent that the filter cloth 2 does not enter, but it is preferable that there are no holes at all.

Further, as shown in FIG. 7, if the curved concave portions 3h, 3h of the depression 3d of the squeeze film 3 are formed as the surrounding portions 3q, 3q so as to surround the collar portion 5a of the holding member 5, the collar portions 3q, 3q. The movement of 5a on the surface of the compressed film 3 in a direction substantially parallel to the surface can be reliably controlled.

[Brief description of drawings]

FIG. 1 is a front view of a squeezing filter plate showing a relationship between a core plate, a filter cloth, and a squeezing membrane of a squeezing filter plate for a squeezing filter press according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of the filter plate.

3 is a squeezing filter press in which the filter plates of FIG. 1 and the normal filter plates are alternately arranged, and III-II of FIG.
It is an I line sectional view.

4A is an explanatory view in which the left half of the filtrate hole holding member is taken as a section, FIG. 4B is a sectional view taken along line IV-IV of FIG. 2, and FIG. 4C is a bottom view of the holding member. Is.

FIG. 5 is a partially enlarged view of a press filter plate according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Core plate, 1a ... Frame part, 1b ... Filtration part, 1c ... Inclined part, 1d ... Grip, 1e ... Ear part, 1f ... Communication hole, 1g ... Through hole, 1h ... Communication hole, 1i ... Filtrate hole, 1j … Communication hole, 1
k ... compressed fluid supply hole, 1m ... filtrate hole, 1n ... undiluted solution hole, 1
p ... concave part, 1q ... annular concave part, 1R ... through hole, 2 ... filter cloth,
2n ... undiluted liquid hole, 3 ... compressed film, 3a ... frame part, 3b ... filtration part, 3c ... inclined part, 3d ... hollow, 3e ... filtrate hole, 3f
... cylinder, 3g ... prism, 3h ... curved concave part, 3i ... projecting part,
3j ... annular convex part, 3k ... annular concave part, 3n ... undiluted solution hole, 3q
... Enclosed part, 5 ... Filtrate hole holding member, 5a ... Top plate, 5b ... Cylindrical part, 5c ... Filtrate inflow hole, 5d ... Annular convex part, 5e ... Filtrate passage, 6 ... Squeezing filter plate, 7 ... Normal filter plate, 7a … Frame,
7b ... Filtration part, 7c ... Inclined part, 7e ... Hole, 7h ... Communication hole, 7j ... Filtrate hole, 8 ... Filtration chamber, 9, 10 ... Packing,
9j, 10j ... filtrate holes.

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[Procedure amendment]

[Submission date] October 28, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (4)

[Claims] 1. A squeeze filter plate for a squeeze filter press comprising a core plate (1) and a squeeze film (3), wherein the squeeze film (3) has a filtrate hole (3e). It has a filtrate passage hole (5c) which can be inserted into the filtrate hole (3e) of 3) and has a filtrate passageway (5e) inside thereof and which connects the filtrate passageway (5e) and the surface side of the compressed membrane. The tubular portion (5b) and the end portion of the tubular portion (5b) can be formed to be substantially flush with the surface of the squeeze membrane (3) when the filter plate is fastened, and the tubular portion (5).
A collar (5) capable of closing the opening of the filtrate passage (5e) of b) and abutting on the periphery of the filtrate hole of the squeeze membrane (3).
a) and has an engaging projection (5d) on either the outer peripheral surface of the tubular portion (5b) or the inner peripheral surface of the filtrate hole (3e) of the compressed film (3), and On the other hand, the engaging recess (3) that engages with the engaging protrusion (5d).
A squeezing filter plate for a squeezing filter press, characterized in that it is provided with a filtrate hole holding member (5) having k). 2. The squeeze filter plate for a squeeze filter press according to claim 1, wherein both the engaging projection and the engaging recess are annular so that they can be brought into close contact when engaged. 3. A column portion (3f) is provided upright in the periphery of the filtrate hole of the squeezing membrane (3), and the collar portion (5a) of the filtrate hole holding member (5) contacts the column portion (3f). The press filter plate for press filter presses according to claim 1, wherein the press filter plates are in contact with each other. 4. The squeezing membrane (3) is configured such that a surrounding portion (3q) surrounding the flange portion (5a) of the filtrate hole holding member (5) is formed at a portion around the filtrate hole. 1-3
A squeeze filter plate for a squeeze filter press according to any one of 1.