WO2012127675A1

WO2012127675A1 - Diaphragm, filter plates, and filter press dehydrator

Info

Publication number: WO2012127675A1
Application number: PCT/JP2011/057122
Authority: WO
Inventors: 水谷　太; 裕康杉村; 博辻野
Original assignee: 株式会社クボタ
Priority date: 2011-03-24
Filing date: 2011-03-24
Publication date: 2012-09-27
Also published as: CN103442780A; CN103442780B

Abstract

Provided are a diaphragm which has a decreased chance of being damage, filter plates which are easily processed, and a filter press dehydrator upon which a filter chamber is formed by the diaphragm and the filter plates. The filter chamber (8) is formed by: the diaphragm (20) in which a thick section (21) that functions as a filter frame is integrally formed at the periphery of a thin section (22) that compresses an undiluted solution; and the filter plates, on side of which a compression section (31) that compresses the diaphragm (20) between adjacent filter plates is formed, and on the other side of which a rising section (37), into which the diaphragm (20) can be inserted, and the thickness of which is smaller than that of the thick section (21), is formed. By supplying the undiluted solution to the filter chamber (8) and inflating the diaphragm (20), the undiluted solution is compressed and dehydrated, producing a cake. In this case, the thick section (21) of the diaphragm (20) functions as a seal surface.

Description

Diaphragm, filter plate and filter press dehydrator

The present invention relates to a diaphragm incorporated in a filter press dehydrator that supplies and concentrates a stock solution into a filter chamber partitioned by a filter frame and a filter plate.

Conventionally, filter press dehydrators have been widely used as solid-liquid separation dehydrators in product manufacturing processes such as carbon production and titanium production, and sludge treatment processes.

The filter press dehydrator forms a filter chamber between parallel filter plates and diaphragms, and performs solid-liquid separation with the filter plate and a filter cloth suspended from the front of the diaphragm, and the dehydrated cake generated in the filter chamber is removed from the diaphragm. It is configured to squeeze in.

An example of a filter plate and a diaphragm used in such a filter press dehydrator is proposed in Patent Document 1. As shown in FIG. 12A, Patent Document 1 discloses a diaphragm 60 in which a support floor 61 and a peripheral edge 62 of a flat concave dewatered cake are integrally formed, a concave support surface 71, and a support surface. A filter plate 75 having a filter bed 75 formed on the back surface of 71 and a diaphragm 60 stretched on the support surface 71 is described.

At the edge of the filter plate 70 on which the diaphragm 60 is stretched, a concave groove 73 and a dovetail groove 74 having its inside expanded are formed endlessly. At the edge of the diaphragm 60, a sealing protrusion 63 to be inserted into the concave groove 73 of the filter plate 70, and a front end portion to be inserted into the dovetail groove 74 of the filter plate 70 are expanded to have a notched slope. The engaging protrusions 64 for locking are formed in an endless shape.

As shown in FIG. 12B, the diaphragm 60 and the filter plate 70 are juxtaposed, and a filter cloth (not shown) is disposed between the diaphragm 60 and the filter plate 70 so that the protrusions 63 and the engaging protrusions 64 of the diaphragm 60 are filtered. After pressing into the concave groove 73 and the dovetail groove 74 of the plate 70, the diaphragm 60 is inserted into the filter plate 70 to form a filter chamber, and after the compressed material is supplied from the stock solution supply member 80 to the filter chamber, the diaphragm 60 is filtered. Pressurized water is injected between the support floors 71 of the plate 70 to inflate the support floor 61 of the diaphragm 60 toward the filtration bed 75, thereby compressing and dewatering the object to be compressed.

JP 2005-144393 A

However, in the diaphragm 60 as described above, stress is repeatedly generated in the movable portion 65 every time the diaphragm 60 is repeatedly expanded and contracted in the pressing process. Since the movable portion 65 is in contact with the filter plate 70, a large stress is concentrated, and wear occurs every time the squeezing and dehydrating operation is performed, so that there is a problem that durability is deteriorated and easily damaged.

Further, the processing of the filter plate 70 that forms the concave groove 73 and the dovetail groove 74 that engage with the protrusion 63 and the engagement protrusion 64 of the diaphragm 60 and the support surface 71 that extends along the support floor 61 of the diaphragm 60. Was cumbersome.

Therefore, as shown in FIG. 12C, in order to reduce complicated processing of the filter plate, it is also conceivable to sandwich the diaphragm 67 with a flat filter plate 66. However, since the filter plate 66 is flat, a separate filter frame 68 is required to form a filter chamber, that is, a space, between the filter plate 66 and the diaphragm 67. Further, the contact surface between the filter frame 68 and the filter plate 66 is required. In order to securely seal, it is necessary to provide the seal member 69. As a result, there is a problem that the number of components increases and the manufacturing process increases.

An object of the present invention is to provide a diaphragm having a reduced risk of breakage, a filter plate that can be easily processed, and a filter press dehydrator in which a filter chamber is formed by the diaphragm and the filter plate.

In order to achieve the above-mentioned object, the characteristic configuration of the diaphragm according to the present invention is that, as described in claim 1 of the claims, the raw solution is supplied to the filter chamber partitioned by the filter frame and the filter plate and compressed. A diaphragm incorporated in a filter press dehydrator, a thick part that functions as a filter frame is integrally formed around a thin part that squeezes the stock solution, and is compressed by a filter plate to form a sealing surface In the point.

According to the above-described configuration, it is not necessary to use a separately manufactured filter frame to form the filter chamber by integrally forming the thick part that functions as a filter frame and the thin part that squeezes the stock solution. By forming the sealing surface by compressing the thick portion with the filter plate, the sealing member is not required, and the number of parts can be reduced.

In the second feature configuration, as described in claim 2, in addition to the first feature configuration described above, the thin portion is formed in a flat plate shape, and an edge portion of the thin portion is an inner portion of the thick portion. It exists in the point connected with the circumferential direction one end part.

According to the above-described configuration, for example, when a filter chamber is formed between one surface of the thin wall portion connected to the end surface of the thick wall portion and the filter plate facing the one surface, the elastic force acting on the thin wall portion is applied to the filter chamber. Since it can utilize as a force which squeezes the injected undiluted | stock solution, a undiluted solution can fully be squeezed. Furthermore, it is possible to prevent the dehydrated cake having passed through the filter cloth from adhering to the vicinity of the edge of the thin portion on the filter chamber side.

Note that, contrary to the above, a filter chamber may be formed between the back surface of one surface of the thin wall portion connected to the end surface of the thick wall portion and the filter plate facing the back surface.

In addition to the above-described second feature configuration, the third feature configuration is the inner peripheral surface of the thick portion, and one surface of the thin portion connected to the inner peripheral surface, as described in claim 3. The filter chamber is formed between the filter plate facing the one surface.

According to the above-described configuration, a filter chamber is formed between the inner peripheral surface of the thick wall portion, one surface of the thin wall portion connected to the inner peripheral surface, and the filter plate facing the one surface. The entire surface of the thin wall portion connected to the inner peripheral surface can be effectively used as a filter chamber. The amount of the stock solution to be injected can be increased.

Furthermore, when discharging the pressurized water used for squeezing the stock solution, the elastic force acting on the thin wall portion can be used as the force for discharging the pressurized water. When the flat part is returned to its original position, the pressurized water is completely discharged.Therefore, when the filtration unit is opened in the opening and dewatering cake discharging process, the pressurized water may spill out and stain the surroundings. Can be reduced.

In the fourth feature configuration, as described in claim 4, in addition to the first feature configuration described above, the thin portion is formed in a flat plate shape, and an edge portion of the thin portion is an inner portion of the thick portion. It exists in the point connected with the position spaced apart from the thickness direction both ends of the circumference.

¡When the diaphragm expands and contracts, stress concentrates repeatedly on the edge of the diaphragm. According to the above-described configuration, since the edge portion is connected to a position separated from the end portion in the thickness direction of the inner periphery of the thick portion, the edge portion does not contact the filter plate, so there is no risk of wear. The risk of damage can be reduced.

In the fifth feature configuration, as described in claim 5, in addition to any of the first, second, or fourth feature configurations described above, the edge of the thin portion functions as a filter frame. The thick portion is connected to one end side in the thickness direction, the central portion of the thin portion is formed on a flat surface protruding to the other end side in the thickness direction of the thick portion, and the flat surface and the edge portion It is in the point connected by the inclined surface.

According to the above-described configuration, it is possible to prevent the dewatered cake passing through the filter cloth from adhering to the vicinity of the edge of the thin portion on the side forming the filter chamber, while taking a relatively large volume of the filter chamber. .

Furthermore, when discharging the pressurized water used for squeezing the stock solution, the elastic force acting on the thin wall portion can be used as the force for discharging the pressurized water. When the thin-walled portion returns to the original position, the pressurized water can be easily discharged. Therefore, when the filtration unit is opened in the opening plate and dehydrated cake discharging step, the possibility that the pressurized water spills and stains the surroundings can be reduced.

The first characteristic configuration of the filter plate according to the present invention is incorporated into a filter press dewatering machine that squeezes the stock solution with the diaphragm having any one of the first to fifth characteristic configurations described above. It is a filter board, Comprising: It exists in the point which the compression part which compresses the said diaphragm between other filter boards, and the rising part for making compression of a diaphragm into a predetermined pressure are formed.

According to the above-described configuration, the pressure at which the thick wall portion of the diaphragm is compressed can be maintained at the predetermined pressure by the rising portion where the compression of the diaphragm is a predetermined pressure. The possibility of damage due to excessive tightening of the meat part can also be avoided.

As described in claim 7, the second characteristic configuration is that, in addition to the first characteristic configuration described above, the thickness of the rising portion is set smaller than the thickness of the thick portion of the diaphragm. .

According to the above-described configuration, the difference between the thickness of the rising portion and the thickness of the thick portion becomes the compression allowance of the diaphragm. Since the diaphragm is not compressed more than the compression allowance, the sealing effect of the sealing surface can be stabilized, and the possibility of damage due to excessive tightening of the thick portion can be avoided.

The characteristic configuration of the filter press dehydrator according to the present invention includes the diaphragm having any one of the first to fifth characteristic configurations described above and the first or second characteristic configuration described above. It is in the point provided with the provided filter plate.

According to the above-described configuration, the diaphragm can be squeezed between the adjacent filter plates at a predetermined pressure, so that a stable sealing effect can be obtained and the risk of damage due to overtightening of the diaphragm can be avoided. Can be dehydrated.

As described above, according to the present invention, it is possible to provide a diaphragm with a reduced risk of breakage, a filter plate that can be easily processed, and a filter press dehydrator in which a filter chamber is formed by the diaphragm and the filter plate. I can do it now.

FIG. 1 is a schematic view of a filter press dehydrator according to the present invention. 2A is an explanatory diagram of the diaphragm, which is a cross-sectional view taken along line AA of the front view, and FIG. 2B is a front view. FIG. 3A is a detailed view of the edge portion of the diaphragm, and FIG. 3B is an explanatory view of the thickness of the diaphragm and the thickness at the rising portion. 4A is a front view of the filter plate, and FIG. 4B is a side view of the filter plate. FIG. 5A is a front view of the stock solution supply member, and FIG. 5B is a side view of the stock solution supply member. FIG. 6A is a plan view of the filter plate, and FIG. 6B is a back view of the filter plate. 7A is a side sectional view showing a state in which the diaphragm is fitted into the filter plate, FIG. 7B is a plan view thereof, and FIG. FIG. 8A is a schematic diagram illustrating a state in which the filtration unit is opened, and FIG. 8B is a schematic diagram illustrating a state in which the filtration unit is closed. 9A is an explanatory diagram of the closing plate process, FIG. 9B is an explanatory diagram of the filtration process, FIG. 9C is an explanatory diagram of the pressing process, and FIG. 9D is an opening plate / dehydrated cake discharging process. It is explanatory drawing. FIG. 10A is a schematic view of a filtration unit according to this embodiment, FIG. 10B is a schematic view of a filtration unit according to another embodiment, and FIG. 10C is an explanatory view of a diaphragm according to another embodiment. FIG. 11A is an explanatory diagram of a diaphragm according to another embodiment, FIG. 11B is an explanatory diagram of a filtration unit provided with a diaphragm according to another embodiment, and FIG. 11C is a filtration provided with a diaphragm according to another embodiment. It is explanatory drawing of a unit. FIG. 12A is a schematic view of an engagement portion between a diaphragm and a filter plate used in a conventional filter press dehydrator, and FIG. 12B is a state in which the diaphragm and filter plate used in a conventional filter press dehydrator are engaged. Schematic and FIG.12 (c) are explanatory drawings in case a filter plate is flat.

Hereinafter, a diaphragm, a filter plate and a filter press dehydrator according to the present invention will be described.

As shown in FIG. 1, in the filter press dehydrator 100, a pair of guide rails 3 are horizontally mounted between the left frame 1 and the right frame 2, and a plurality of filtration units 4 are mounted on the left frame. 1 and the right frame 2 are slidably mounted. The right frame 2 is provided with a pressing cylinder 6, and a pressing member 5 is provided at the tip of the rod 6 a of the pressing cylinder 6.

The plurality of filtration units 4 are connected to adjacent filtration units 4 by link members (not shown), the rightmost filtration unit 4 in FIG. 1 is connected to a filtration unit driving device, and the leftmost filtration unit 4 is a left frame 1. It is connected with the side. When the right end filtration unit 4 moves in the right direction, the filtration unit 4 sequentially moves in the right direction, and the filtration units 4 are separated by a link member at a predetermined interval.

The movement of the filtration unit 4 is not limited to the above-described configuration, and the filtration unit 4 is suspended on a chain (not shown) disposed between sprockets (not shown) provided in the left frame 1 and the right frame 2. And the structure which moves the filtration unit 4 suspended by the said chain by driving a sprocket and moving a chain may be sufficient.

Between the adjacent filtration units 4, an endless filter cloth 7c stretched between a plurality of upper support members 7a and lower support members 7b is arranged in the vertical direction.

The plurality of filtration units 4 are pressed by a predetermined pressure from the right frame 2 direction to the left frame 1 direction with the filter cloth 7c sandwiched therebetween by the pressing cylinder 6 via the pressing member 5 so as to be closed. It is configured.

The filtration unit 4 includes a filter plate 30 and a diaphragm 20 supported on one side of the filter plate 30, and the filter chamber 8 is configured by being divided by a thick portion of the diaphragm 20 that functions as a filter frame and the filter plate 30.

The left frame 1 is provided with a stock solution supply port 9 for supplying a stock solution that is an object to be squeezed into the filter chamber 8 and a filtrate discharge port 10 through which the filtrate squeezed in the filter chamber 8 is discharged.

When the stock solution is supplied into the filter chamber 8 from the stock solution supply port 9 and squeezed by the filtration unit 4, the filtrate is discharged from the filtrate discharge port 10, and when the filtration unit 4 is opened by the filtration unit driving device, a plurality of filtrations are performed. The dewatered cake dehydrated from between the units 4 is discharged.

As shown in FIGS. 2 (a) and 2 (b), in the diaphragm 20, a thick portion 21 that functions as a filter frame is integrally formed around a thin portion 22 that squeezes the stock solution. The thick portion 21 is compressed between the filter plates 30 so that the compressed surface functions as a sealing surface.

As shown in FIG. 3, the edge portion of the thin portion 22 is connected to one end side in the thickness direction of the inner periphery of the thick portion 21, for example, a position separated by a distance d from one end portion in the thickness direction. The central portion of the thin portion 22 (see FIG. 2A) is formed on a flat surface that protrudes toward the other end in the thickness direction of the thick portion 21, and the flat surface and the edge portion are connected by an inclined surface 23. Yes. A plurality of filtrate grooves 25 are formed in the filter chamber side surface 22 a of the thin wall portion 22.

The edge of the thin wall portion 22 is a portion where stress concentration occurs when the thin wall portion 22 moves when the stock solution in the filter chamber is squeezed. However, according to the above-described configuration, the edge portion of the thin portion 22 is connected to the position separated from both end portions in the thickness direction of the inner periphery of the thick portion 21, so that the edge portion and the filter plate 30 where stress concentration occurs Can be avoided. The possibility of damage due to friction or the like can be reduced, and the life of the diaphragm 20 can be extended.

A filtrate discharge passage 26 penetrating in the thickness direction of the thick wall portion 21 is formed in the left and right lower portions of the diaphragm 20 so as to communicate with the filtrate groove 25 so that the filtrate can be passed through.

The diaphragm 20 is not particularly limited in material, but the thick portion 21 is subjected to a large pressure that functions as a sealing surface, and the thin portion 22 is moved to squeeze the stock solution. Those having flexibility are preferred.

For example, the diaphragm 20 can integrally form the thick portion 21 and the thin portion 22 by injection molding a polymer compound such as a thermoplastic elastomer. By integrally molding the thick portion 21 and the thin portion 22, the number of components necessary for forming a filter chamber space such as a separately manufactured filter frame can be reduced. Note that the thick portion 21 is sandwiched by a pressure that can withstand the supply pressure of the stock solution supplied into the filter chamber and functions as a seal surface.

The diaphragm 20 needs to maintain the function as a movable part that squeezes the stock solution while maintaining the function as a sealing surface, and therefore the hardness when using the elastomer resin is preferably in the range of about JIS A hardness 65 to 90. .

The thick wall portion 21 may have a solid structure, and as shown in FIG. 3, the plurality of recesses 24 are formed so as to be alternately front and back, so that the thickness of each portion of the diaphragm 20 is different. By reducing the above, it may be formed so as to prevent a bias in shrinkage during cooling of injection molding.

As shown in FIG. 4 (a), one side of the filter plate 30 is provided with a compression unit 31 that compresses the stock solution between adjacent diaphragms. A plurality of wavy filtrate grooves 32a for passing the filtrate compressed in the filter chamber 8 through the compression section 31 are formed in the vertical direction, and the plurality of filtrate grooves 32a are connected by a lower connection groove 32b. The connecting groove 32b is formed to be inclined downward from the center of the filter plate 30 to the left and right sides, and is configured to communicate with a filtrate discharge passage 33 formed at the lower left and right of the filter plate 30.

Further, a filtrate discharge passage 34 is formed below the filtrate discharge passage 33 so as to communicate with the filtrate discharge passage 26 in a state where the diaphragm 20 is sandwiched between the filter plates 30.

A stock solution supply passage 35 penetrating in the front-rear direction is provided at the upper left and right sides of the filter plate 30, and a recess 36 into which the stock solution supply member 40 can be loosely inserted is formed at the periphery of the stock solution supply passage 35. 36a is provided.

A pair of slide pieces 45 for mounting on the pair of guide rails 3 are attached to the left and right sides of the filter plate 30.

As shown in FIG. 5, the stock solution supply member 40 includes a stock solution supply pipe 41 that can be inserted into the stock solution supply path 35 and a stock solution supply unit 42 that is loosely inserted into the recess 36 of the filter plate 30. The stock solution supply section 42 is formed with a feed channel 43 that branches perpendicularly from the stock solution supply pipe 41 and feeds the stock solution supplied from the stock solution supply pipe 41 into the filter chamber 8.

The stock solution supply member 40 is positioned so that the stock solution supply member 40 is positioned at a predetermined position with the filter plate 30 into which the stock solution supply member 40 is loosely inserted and the adjacent filter plate being opened.

Link members

44a and 44b are fixed by bolts 44c.

As shown in FIGS. 8A and 8B, when the pair of filter cloths 7c are tightened by the

adjacent filtration units

4a and 4b, the stock solution supply part 42 of the stock solution supply member 40 is connected to the diaphragm 20 and the filter plate 30b. It becomes the shape sandwiched between the double filter cloths 7c positioned between them, and the stock solution is supplied into the filter chamber 8 formed between the thin portion 22 of the diaphragm 20 and the compression portion 31 of the filter plate 30.

The stock solution supply member 40 is loosely inserted into the recess 36 of the filter plate 30 when the

adjacent filtration units

4a and 4b are pressed to form the filter chamber 8 between the pair of filter cloths 7c. The stock solution supply pipe 41 is accommodated in the stock solution supply path 35 and is configured to be connected to the stock solution supply path 35 of the adjacent filtration unit 4.

When the stock solution is supplied from the stock solution supply port 9 to the stock solution supply path 35, the stock solution is supplied to each filter chamber 8 via the stock solution supply member 40.

6A and 6B, a rising portion 37 and a mounting surface 38 into which the diaphragm 20 can be fitted are formed on the other side of the back surface of the compression portion 31 of the filter plate 30. As shown in FIG. The thickness of the rising portion 37 is set to be smaller than the thickness of the diaphragm 20.

That is, when the diaphragm 20 is fitted and supported on the filter plate 30, the thickness of the thick portion 21 of the diaphragm 20 is larger than the thickness of the rising portion 37, so that the difference in thickness is a compression allowance between adjacent filter plates. It becomes.

Usually, the pressing force applied by the pressing cylinder 6 is large enough to prevent the stock solution in the filter chamber 8 from leaking out, but the pressing force by the pressing cylinder 6 is stronger than a predetermined pressure required for sealing the diaphragm 20. Even in this case, when the thick portion 21 of the diaphragm 20 is flush with the rising portion 37 of the filter plate 30, the rising portion 37 supports pressure with the adjacent filter plate 30, so that the thick portion 21 of the diaphragm 20 Since a pressure higher than a predetermined pressure is not applied, it is possible to avoid damage, displacement, etc. due to excessive tightening of the diaphragm 20.

When the diaphragm 20 is compressed by the compression portion 31 of the filter plate 30 adjacent to the mounting surface 38 in a state where the diaphragm 20 is fitted and supported on the mounting surface 38, the left and right rising portions 37 are compressed at a predetermined pressure. It is configured to be. The diaphragm 20 is fixed to the mounting surface 38 with bolts or the like as appropriate.

Below the center of the attachment surface 38 of the filter plate 30, a pressurized water inlet 39 a and a pressurized water inlet path 39 b for supplying pressurized water for inflating the diaphragm 20 toward the compression portion 31 side of the adjacent filter plate are formed.

As shown in FIGS. 7A, 7B, and 7C, when the diaphragm 20 is fitted into the filter plate 30, the pressurized water is introduced from the pressurized water supply pipe 46 attached to the lower portion of the filter plate 30. It is supplied between the attachment surface 38 and the thin portion 22 of the diaphragm 20 through the passage 39b and the pressurized water inlet 39a. The thin part 22 of the diaphragm 20 will expand to the compression part 31 side of the adjacent filter plate 30.

In addition, what expand | swells the thin part 22 of the diaphragm 20 to the compression part 31 side of the adjacent filter plate 30 should just be a fluid not only pressurized water, For example, pressurized gas may be sufficient.

For example, if a synthetic resin material such as polypropylene is extruded, the filter plate 30 may be inferior to a conventional metal filter plate in strength while taking advantage of the lightness and chemical resistance that are characteristics of the compatible resin. Absent. The filter plate 30 becomes lightweight, and the weight of the plurality of filtration units 4 arranged in parallel is reduced.

The filter cloth 7c will be described. The filter cloth 7c is formed in an endless shape, and includes a plurality of upper support members 7a and lower support members 7b provided between the filtration units 4, a filter cloth tensioning device 7d provided in the upper frame 11, and filter cloth meandering prevention. The filter unit 4 is driven by the filter cloth driving device 7f while being tensioned by the device 7e. A cleaning device 7g is provided in the upper frame 11, and even when the filter cloth 7c is clogged or the residue of the dewatered cake remains on the surface of the filter cloth 7c, the cleaning liquid supplied from the outside is sprayed. The dirt of the filter cloth 7c can be washed.

Thus, if the plurality of filter chambers 8 are covered with one filter cloth 7, the entire surface can be efficiently used by circulating the filter cloth 7c by the filter cloth driving device 7f. The filter cloth 7c may not be configured to circulate the filter cloth 7c by the filter cloth driving device 7f using a single endless filter cloth 7c. A configuration in which a pair of filter cloths are stretched between the plurality of filtration units 4 and the pair of filter cloths between the filtration units 4 respectively move downward is also possible.

The filter press dehydrator 100 configured as described above is operated in the order of a closing plate process, a filtration process, a pressing process, and an open plate / dehydrated cake discharging process. Each step will be described based on the schematic diagram shown in FIG.

In the closing plate process, the pressing member 5 is advanced through the rod 6 a of the pressing cylinder 6 to press the plurality of filter plate units 4, and a plurality of portions are interposed between the thin portion 22 of the diaphragm 20 and the compression portion 31 of the filter plate 30. This is a step of forming a filtration chamber. As shown in FIG. 9A, in the closing plate process, the pressing cylinder 6 is operated in a state where the filter cloth 7c is disposed between the adjacent filtration units 4, and the pressing member 5 is advanced through the rod 6a. The filtration unit 4 is pressed in the direction of the left frame 1 to form a plurality of filter chambers 8 defined by the thick portion 21 and the filter plate 30 of the diaphragm 20 functioning as a filter frame.

The filtration step is a step in which the stock solution is pressed into the pair of filter cloths 7c of the filter chamber 8 formed by the closed plate step and filtered. As shown in FIG. 9B, in the filtration step, the stock solution is press-fitted into the filter chamber 8 formed by the closing plate step from the stock solution supply port 9 on the left frame 1 side and filtered through the filter cloth 7c, and the filtrate is filtered at the bottom. The liquid flows down from the liquid discharge port 10 and is drained to the outside of the filter press dehydrator 100.

The squeezing step is a step of compressing and dewatering the residue containing moisture remaining between the filter cloths 7c in the filtration step to form a dehydrated cake. As shown in FIG. 9 (c), in the pressing process, pressurized water is supplied from the pressurized water supply pipe 46 to the back surface of the diaphragm 20 through the pressurized water inlet 39, and the diaphragm 20 is inflated toward the center side of the filter chamber 8, and the filter cloth 7c. The cake remaining in between is pressed to the compression part 31 side of the other filter plate 30 and compressed and dehydrated to form a cake.

The plate opening and dewatering cake discharging step is a step of stopping the supply of pressurized water and contracting the diaphragm 20, then retracting the rod 6 a of the pressing cylinder 6 to open each filtration unit 4 and discharging the dewatering cake. As shown in FIG. 9D, when each filtration unit 4 is opened, the dewatered cake falls from the filter cloth 7c by its own weight. When the viscous dehydrated cake adheres to the filter cloth 7c and does not fall under its own weight, the filter cloth drive device 7f moves the filter cloth 7c up and down to separate it. In addition, when discharging the pressurized water used for squeezing the stock solution, the elastic force acting on the thin-walled portion can be used as the force for discharging the pressurized water, and when the thin-walled portion returns to the original position, the pressurized water is discharged. Since it is easy, when the filtration unit is opened in the opening plate and dehydrated cake discharging step, the possibility of spilling pressurized water and soiling the surroundings can be reduced.

Hereinafter, another embodiment of the filter press dehydrator according to the present invention will be described. In the embodiment described above, as shown in FIG. 10 (a), the filtration unit 4 is constituted by a pair of diaphragms 20 and a filter plate 30, and the filter chamber 8 is formed by the thin portion of the diaphragm 20 and the compression portion of the adjacent filter plate 30. Although the case where it comprises is demonstrated, as shown in FIG.10 (b), you may comprise the filter chamber 51 by making a pair of diaphragms 20 oppose. In this case, the diaphragm 20 can be configured to be fitted and supported on both surfaces of the filter plate 50.

In the embodiment described above, the edge of the thin portion 22 of the diaphragm 20 is connected to one end side in the thickness direction of the thick portion 21, and the central portion of the thin portion 22 is the other end side in the thickness direction of the thick portion 21. The flat surface and the edge portion are connected to each other by the inclined surface 23. However, as shown in FIG. 10C, the diaphragm 20 has a thin-walled portion 22 in a flat plate shape. The edge part of the thin part 22 formed, and the structure connected to the position separated from the thickness direction both ends of the inner periphery of the thick part 21 which functions as a filter frame may be sufficient.

As shown in FIG. 11A, the diaphragm 20 has a thin portion 22 formed in a flat plate shape, and the edge of the thin portion 22 is one end in the thickness direction of the inner periphery of the thick portion 21 that functions as a filter frame. The structure connected with the part may be sufficient. In this case, the surface 22 b of the thin portion 22 is formed flush with the thickness direction end of the thick portion 21, or the edge of the thin portion 22 is slightly spaced from the thickness direction end of the thick portion 21. Thus, the surface 22b of the thin portion 22 is formed so as to be substantially flush with the end of the thick portion 21 in the thickness direction.

Stress concentration is achieved by connecting the edge of the thin portion 22 slightly away from the end of the thick portion 21 in the thickness direction, for example, by a distance of about 3% to 10% with respect to the thickness of the thick portion. Since the contact between the edge portion and the filter plate in which the occurrence of the phenomenon occurs can be avoided, the possibility of breakage due to friction or the like can be reduced, and the life of the diaphragm can be extended.

As shown in FIG. 11B, a drainage groove is formed on the back surface 22 c of the surface 22 b of the thin portion 22 of the diaphragm 20 configured as described above, and the diaphragm 20 so that the back surface 22 c faces the filter chamber 8. Since the thin wall portion 22 itself is formed in a flat plate shape when being inserted into the filter plate 30, the entire portion is used as the filter chamber 8 up to the edge portion 22 d of the back surface 22 c connected to the inner peripheral surface of the thick wall portion 21. Therefore, the amount of stock solution to be injected can be increased.

Furthermore, when the pressurized water injected into the surface 22b side of the thin portion 22 of the diaphragm 20 is discharged, the elastic force 22k acting on the thin portion 22 can be used as a force for discharging the pressurized water. Since the surface 22b of the thin portion 22 returns to a position that is flush with the end in the thickness direction of the thick portion 21, the pressurized water is not completely discharged and does not remain on the surface 22b side of the thin portion 22, When the filtration unit 4 is opened in the dehydrated cake discharging step, the possibility that the pressurized water spills and stains the surroundings can be reduced.

Conversely, as shown in FIG. 11 (c), a drainage groove is formed on the surface 22 b of the thin wall portion 22 of the diaphragm 20 configured as described above, and the diaphragm 20 so that the surface 22 b faces the filter chamber 8. When the filter plate 30 is used by being inserted into the filter plate 30, the elastic force 22k that the surface 22b of the thin wall portion 22 tries to return to the same direction as the end in the thickness direction of the thick wall portion 21 is used as the force for squeezing the stock solution. Can do. The whole undiluted solution press-fitted into the filter chamber 8 can be reliably squeezed. It is possible to prevent the dehydrated cake having passed through the filter cloth from adhering to the vicinity of the edge of the thin portion 22.

In embodiment mentioned above, although the structure provided with the rising part 37 which can insert the diaphragm 20 in the right and left of the other side of the back surface of the compression part 31 of the filter plate 30 was demonstrated, a rising part is not restricted to the right and left of a filter plate, A configuration provided on the top and bottom may be used. Further, the rising portion may be formed with a small protrusion and a diaphragm holding portion for holding the diaphragm may be provided separately. The rising portion may be in any form as long as the compression of the thick portion of the diaphragm can be maintained at a predetermined pressure. May be.

Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. Needless to say.

100: Filter press dehydrator 1: Left frame 2: Right frame 3: Guide rail 4: Filtration unit 5: Press member 6: Press cylinder 6a: Rod 7a: Upper support member 7b: Lower support member 7c: Filter cloth 7d: Filter Cloth tension device 7e: Filter cloth meandering prevention device 7f: Filter cloth drive device 7g: Cleaning device 8: Filter chamber 9: Stock solution supply port 10: Filtrate discharge port 11: Upper frame 20: Diaphragm 21: Thick part 22: Thin wall Portion 23: Inclined surface 24: Recess 25: Filtrate groove 26: Filtrate discharge passage 30: Filter plate 30b: Filter plate 31: Compression part 32a: Filtrate groove 32b: Connection groove 33: Filtrate discharge passage 34: Filtrate Discharge passage 35: Stock solution supply path 36: Recess 36a: Packing 37: Rising part 38: Mounting surface 39a: Pressurized water introduction port 39b: Pressurized water introduction path 40: Stock solution supply member 41: Stock solution supply pipe 42: Stock solution supply section 43

Supply fluid channel

44a, 44b: link member 44c: bolt 45: the sliding piece 46: the pressurized water supply pipe 50: filter plate 51: filtrate chamber d: Distance

Claims

A diaphragm built into a filter press dehydrator that supplies and squeezes a stock solution into a filter chamber partitioned by a filter frame and a filter plate,
A diaphragm in which a thick part that functions as a filter frame is integrally formed around a thin part that squeezes the stock solution and is compressed with a filter plate to form a sealing surface.
The diaphragm according to claim 1, wherein the thin portion is formed in a flat plate shape, and an edge portion of the thin portion is connected to one end portion in the thickness direction of the inner periphery of the thick portion.
The filter chamber is formed between an inner peripheral surface of the thick portion, one surface of the thin portion continuous to the inner peripheral surface, and a filter plate facing the one surface. Diaphragm.
2. The diaphragm according to claim 1, wherein the thin portion is formed in a flat plate shape, and an edge portion of the thin portion is connected to a position separated from both end portions in the thickness direction of the inner periphery of the thick portion.
A flat surface in which an edge of the thin portion is connected to one end in the thickness direction of the thick portion that functions as a filter frame, and a central portion of the thin portion projects to the other end in the thickness direction of the thick portion The diaphragm according to claim 1, wherein the flat surface and the edge portion are connected by an inclined surface.
A filter plate incorporated in a filter press dehydrator that squeezes the stock solution with the diaphragm according to any one of claims 1 to 5,
The filter plate in which the compression part which compresses the said diaphragm between other filter plates, and the rising part for making compression of a diaphragm into a predetermined pressure are formed.
The filter plate according to claim 6, wherein the thickness of the rising portion is set smaller than the thickness of the thick portion of the diaphragm.
A filter press dehydrator comprising the diaphragm according to any one of claims 1 to 5 and the filter plate according to claim 6 or 7.