KR840000737B1 - Filteration-compression type filter press - Google Patents

Abstract

A filter press has a fixed end plate(4), a movable end plate(5) and compression filter plates(7) suitaly disposed therebetween. Each filter plate has a base plate(11) with a central opening(11a) that is larger than a slurry feed port(20), and a filter compression diaphragm(13) in the form of two flexible fluid-tight sheets(13b) that are applied to the front and rear surfaces of the base plate and have uneven filter surfaces(13a) with a filter cloth piece applied thereto. A ring(25,26) radially divided at least once to prevent the displacement of the filter compression diaphragm relative to the base plate, is fitted in the base plate opening around the cylindrical portion(13c) and held axially to the openingdefining inner periphery of the base plate.

Description

Filtration Press Filter Filter

1 is a partial cross-sectional side view of a filtration compression filter press showing an embodiment of the present invention.

2 is a partially enlarged cross-sectional view of FIG. 1 clearly showing the path of pressurized fluid.

3 is a front view of the compressed filter plate of the embodiment of FIG. 1 in which a part is cut away.

4 is a front view of the compression filtration plate with the filter plate of FIG. 3 removed.

FIG. 5 is a front view of a conventional filter plate of the FIG.

6 is a cross-sectional view showing the assembled state of the compressed filter plate shown in FIG. 3 and FIG.

7 is an enlarged cross-sectional view of the stock solution of FIG.

8 is a perspective view of a position preventing ring.

The present invention pressurizes and feeds the stock solution and advances the filtration as a primary treatment by the supply pressure, compresses the cake remaining in the filtration chamber after expansion by swelling to the filtration chamber side of the compressed membrane facing the same filtration chamber, The so-called filtration crimp filter press of the type which performs the liquid removal as a secondary process.

It is already widely known that this type of filter press forms an uneven filter surface on the surface facing the filtration chamber of the compressed membrane, shares it with the filtration and the compression, and simplifies the structure. In addition, what is known in US Patent No. 388242 is that the compressed film is integrally formed so that two flexible hermetic sheets covering the front and back of the substrate are continuously formed in a cylindrical portion through the opening in the center of the substrate to form a stock solution hole. It is molded to form a pressure chamber between the substrate and each sheet, and the compressed film is handled integrally with the substrate by its usual portion through the substrate opening.

Therefore, the compressed membrane and the substrate are handled in the same manner as one conventional filter plate. However, the crimping film is an integral molded product which is continuous to the ordinary portion in which two sheets form a stock solution hole, so that one sheet cannot be deposited on the substrate unless it exits the substrate opening. Thus, the substrate opening must be large enough for the above sheet insertion. Therefore, a normal gap occurs between the substrate opening and the normal portion of the compressed film. This gap causes the positional deviation of the compressed film with respect to the substrate, and destabilizes the function of the filter press. Due to the high pressure of the stock solution, a strong load acts on the stock solution, and it is preferable to prevent the positional deviation of the compressed film that has been transmitted with a sufficient structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a filtration compression filter press having a compression filtration plate having a structure that satisfies the foregoing requirements and which is easy to assemble.

The present invention is characterized by two substrates having a pressurized filter plate arranged appropriately between a fixed end plate and a movable end plate, the substrate having an opening at the center having a considerably larger than the undiluted hole, and a 凹凸 filtering surface abutting on the front and back of the filter body on which the filter body is deposited. It connects the flexible hermetic sheet to the cylindrical upper part passing through the substrate opening and at the same time becomes a filtration crimping film integrally formed to form a stock solution hole. The filtration crimping film rolls the flexible hermetic sheet on the other side and inserts it into the substrate opening. In the case of attaching the substrate to the substrate by developing the sheet, the positional variation is prevented in order to prevent the positional deviation between the substrate and the compressed film due to the gap between the substrate opening and the cylindrical upper part forming the undiluted hole of the compressed film sheet. Means for preventing are installed.

This position shift prevention means inserts a position shift prevention ring, which fills it in the gap between the substrate opening and the cylindrical portion forming the stock solution hole of the pressurized film, and places it in the inner circumference of the substrate opening.

Thereby, the positional change of a board | substrate and a crimping film is prevented, and the positional change prevention ring especially prevents the positional change to any direction. It does not deform even when subjected to a strong load by locking to the inner circumference of the substrate opening, so that it is stable and rich in durability, thereby fully reinforcing the compressed membrane cylindrical portion, and stabilizes the function of the filter press.

Moreover, the position change prevention ring can be easily attached when the sheet on one side is inserted into the substrate opening, and when the ring is divided, the attachment is easier.

Other features of the present invention will become apparent from the following description and drawings. First, the embodiment shown in the drawings will be described. In the drawings, 1 and 2 are the bases, side bars 3 and 3 are hypothesized between the two sides, and a fixed end plate 4 is placed on one base 1. The movable end plate 5 which advances and retreats by the cylinder 6 is provided in the other base 2. A handle in which the movable end plate 5, the filter plate 7 of a conventional structure alternately arranged between the movable end plate 5 and the fixed end plate 4, and the improved compressed filter plate 8 protrude from each side. 15) is suspended from the side bars (3, 3) to move. As shown in FIG. 1, FIG. 2, and FIG. 5, the normal filter plate 7 has a concave-convex filter surface 7a on both sides, and the compressed filter plate is adhered to the filter material 9 on the surface thereof. 8 shows a substrate 11 having an opening 11a which is sufficiently larger than the undiluted hole 10 as shown in FIGS. 1 to 4 and abuts on the front and back of the substrate 11. It becomes the filtration compression film 13 which forms the pressurization chamber 12. As shown in FIG.

The compressed film 13 abuts on the front and back of the substrate 11 so that flexible hermetic sheets 13b and 13b, such as rubber, having an uneven filtering surface 13a on the surface thereof, are formed through the opening 11a of the substrate 11. Continuously formed in the cylindrical portion 13c and formed integrally so as to form the stock solution hole 10. As the substrate 11, one sheet 13b is folded into two stock solutions in the stock solution hole 10. 10) The two sides are rolled around the portion, and the word is inserted into the substrate opening 11a by inserting one sheet 13b and then unfolding it. The insertion of this sheet can be facilitated by, for example, tying the dried sheet 13b with a string.

In the compressed filter plate 8 in which the compressed film 13 is attached to the substrate 11, the filter material 9 is deposited on the filtration surfaces 13a and 13a formed by the sheets 13b and 13b.

An annular protrusion (13d) is formed on the outer circumference of the ordinary portion (13c) that continues each sheet (13b) of the filtration compression film (13) to the stock solution hole (10), and the opening of the cylindrical portion (13c) and the substrate (11) An annular sphere 25a of the inner circumference between 11a is abutted on the ring 25 fitted with the protrusion 13d and one part of the front face of the ring 25 and is formed on the outer circumference between the ring 25. The auxiliary ring 26 which sandwiches the protrusion 11b formed in the inner part of the opening 11a in the groove 25b part is inserted, and both rings 25 and 26 are fastened with the bolt 27 and the nut 28. The nut 28 is unnecessary if a screw hole is formed in any of the rings 25 and 26, and the bolt 27 is also unnecessary if both rings 25 and 26 are directly screwed together. Each ring 25 and 26 can be divided in two radial directions to facilitate mounting. In this case, the fitting and fastening of the rings 25 and 26 is performed at the time when the sheet 13b on one side is inserted into the opening 11a. As a result, the positions of the rings 25 and 26, the substrate 11, and the rings 25 and 26 and the compressed film 13 in the axial direction of the stock solution hole 10 are also prevented. The fitting of the protrusion 13d and the groove 25a may be omitted without hindering free expansion of the crimping film 13. The grooves 25a may be formed by fitting the protrusions to the ring shaft, and in this case, it is appropriate to divide the ring into two in the radial direction.

The stationary end plate 5 and the movable end plate 6 are adjacent to the crimping filter plate 8, and the opposite surface is not shown, and a filtration surface like the filtration surface 7a of the conventional filter plate 7 is formed, The filter medium 9 is deposited on the surface.

When the filter plates 7 and 8 are pinched between the movable end plate 6 and the fixed end plate 5 by the advancement of the movable end plate 6, they are mutually press-contacted through the filter medium 9 as shown in FIG. The filtration chamber 14 surrounded by the filtration surfaces 7a and 13a is formed in between. Each of the filtration chambers 14 is adjacent to the pressure chamber 12 separated from the sheet 13b having the filtration surface 13a on one side thereof.

Each filter plate 7, 8 has the main filtrate outflow path 17a which communicates with the filtrate outlet 16 which is provided in the lower side both sides of the stationary end plate 4 continuously when press-contacted. And the filter plate 7 has the sub-filtrate outflow path 17b which communicates with the outflow path 17a of the left side of FIG. 5, and opens to the filtration surface 7a, The filter plate 8 is the right side of the FIG. The secondary filtrate outflow path 17b communicating with the filtrate outflow path 17a of the sheet 13b and communicating with the filtration surface 13a of the sheet 13b is spherically formed on the surface of the liquid margin part 13e of the sheet 13b. . The filtrate outflow path 17a of the filter plate 8 penetrates through the substrate 11 and the sheets 13b and 13b to be opened in the liquid margin portion 13d of the sheet 13b, and penetrates the liquid through the filter plate 7. It faces the outflow path 17a opened by the edge part 7b, it communicates with each other by the pressure contact of both liquid lead parts 13d. 7b, and the flow path 17b of the press filter plate 8 becomes an airtight path. The fixed end plate 4 has a grant and outflow path 17b opened to its filtration surface 4a and a main filtrate outflow path 17a that is continuous to and flows directly into the filtrate outlet 16, and has a movable end plate 5 ) Is filtered through the grant filtrate outflow path 17b opened to the filtration surface 5a, and the main filtrate outflow path 17a which is continuous to and provided to each of the filter plates 7, 8 and the fixed end plate 4, respectively. The main filtrate outflow path 17a communicated with the liquid outflow port 16 is provided. (FIGS. 1 and 3 to 5).

Further, each of the filter plates 7 and 8, the fixed end plate 4, and the movable end plate 5 are mutually continuous when they are press-contacted, and the pressurized fluid supply port 18 provided on one side of the upper side of the fixed end plate 4 is provided. The main pressure fluid supply passage 19a communicating with the opening is formed so as to be opened to each liquid lead portion, and the filter plate 8 communicates in the substrate 11 with respect to the supply passage 19a and opens to the pressure chamber 12. The additional pressure fluid supply passage 19b is provided, and the main combined supply passage 21a communicates with the combined supply port 20 for the washing water and the pressurized fluid provided on the upper side of the fixed end plate 4. ) Is also formed to open to the liquid edges of the filter plates 7 and 8 and the end plates 4 and 5, and the filter plates 7 and 8 communicate with the supply passage 21a to the filter surfaces 7a and 13a. A floating dual purpose supply path 21b is formed. In addition, the supply path 21b of the filter plate 8 is opened to the filter surface 13a by a through hole 21c formed at the corner of the filter surface 13a that is pressed against the liquid edge portion expanded portion 7b of the filter plate 7. It is. The pressurized fluid supply line 22 connected to the pressurized fluid supply port 18 is connected to the washing liquid supply line 23 connected to the branch pipe 22a to the combined supply path 20, and to the pressurized fluid supply line 22. Each main valve (V22. V23) is provided in front of the branch point of the branch pipe (22a) of the () and in front of the connection point where the branch pipe is in contact with the washing liquid supply pipe (23). In addition, the valve V2 is provided between the branch point of the valve V1, the pipe line 22, and the supply path 18 in the middle of the branch pipe 22a, and the branch point and the valve V1 of the branch pipe 22a are respectively provided. The first discharge path 22b which has the valve V3 in the middle between (), and the 2nd discharge which has the valve V4 in the middle between the branch pipe connection part of the washing | cleaning liquid supply line 23, and the supply port 20 in the middle. The pipes 23a are connected to each other (FIGS. 1 to 3).

In FIG. 1, 24 is the stock solution supply port provided in the base 1, and it communicates with each filtration chamber 14 through the fixed end plate 4 and the stock solution hole 10 of each filter plate 7,8. When performing filtration, the movable end plate 95 advances by the cylinder 6, and the respective filter plates 7 and 8 are pinched between the fixed end plates 4 as shown in FIG. In this state, the stock solution is supplied into each filtration chamber 14 from the stock solution supply port 24. The raw liquid fed into the filtration chamber is filtered by flowing through the filter medium 9 into each of the filtration surfaces 7a and 13a forming both side walls of the filtration chamber 14 by the supply pressure thereof. The filtrate flowing into the filtration surfaces 7a and 13a flows down the filtration surfaces 7a and 13a and is in a continuous state with each other through the grant filtrate outflow path 17b which is opened to the filtration surfaces 7a and 13a. The main filtrate outflow path (17a) is introduced and joined and discharged from the filtrate outlet (16).

After the filtration is continued for a predetermined time, the supply of the raw liquid is stopped, and the pressurized fluid is supplied to the supply port 18 through the pressurized fluid supply line 22. At this time, all other than the valves V22 and V2 are closed, and the supplied pressurized fluid is classified into each of the additional pressure fluid supply passages 19b from the main pressurized fluid supply passage 19a in a continuous state, and thus each pressurized chamber ( 12). As a result, the filtration compression film 13 of the filter plate 8 is separated from the substrate 11 shown on the left side of the cross section while the sheet 13b shown on the right side of the cross section of FIG. 1 adheres to the substrate 11. It swells and compresses the cake (not shown) which remains in the filtration chamber 14 by the said filtration, and further liquid-reduces. This dewatering liquid is discharged in the same path as the filtrate.

After the removal of the liquid, the valve V22 is closed, and the valve V1 is opened while the valve V1 is left. As a result, the main pressure fluid supply passage 19a and the washing liquid and the pressurized fluid supply passage 21a communicate with a part of the supply passages 22 and 23 through the branch pipe 22a, and were supplied into the pressure chamber 12. The pressurized fluid flows back to the combined supply path 21a. And it flows out into the filtration surfaces 7a and 13a of these filter plates 7,8 through the sub-universal supply path 21b of each filter plate 7,8, and remains in the filtrate opening of the filtration surfaces 7a and 13a. The filtrate is forcibly discharged through the filtrate outlet path. Therefore, the recovery rate of the filtrate is improved, and even when a cake is required, the filtrate remaining on the filtration surfaces 7a and 13a is mixed when the cake is recovered, so as not to lower the dehydration rate. In addition, the pressurized fluid forcing the filtrate is mixed with the filtrate and flows out. At this time, when compressed air is used as the pressurized fluid, the gas-liquid mixture is used, so air naturally diverges, so there is no problem. When this residual filtrate is not forcibly discharged, the pressurized fluid used for pressing is opened by pressing the valves V2.V3 and V4 after the desorption of the cake from the first and second discharge pipes 22b and 23a. Release.

Filtration is repeated by performing the above operation by one filtration operation. When the stock solution is supplied at each time, the valves V3 and V4 are left open for a predetermined time, and the remaining air in the pressurizing chamber 12 and the filtration chamber 14 is discharged by the stock solution supply. Proper operation of each valve can be carried out automatically according to a certain program with filtration operation.

When the filtration is repeatedly performed, the filter medium 9 gradually clogs and the filtration efficiency is lowered. For this reason, the filter medium 9 is backwashed at regular intervals or when necessary during the program. This backwash is performed by opening the valve V23 and supplying the washing liquid from the supply port 20 through the washing liquid supply line 23. The supplied washing liquid is classified into the dual feeder 21b in the main feeder 21a and flows out to the filter surfaces 7a and 13a. And the stock solution passage is opened as the washing liquid discharge passage, and the filtrate discharge passage is closed so that no air in the passage is extruded, and the feed washing liquid passes through the filter medium 9 from the filtrate. Penetrates into the filter chamber 14 from the side) and attaches to the filter medium 9 according to the filtration by the flow opposite to the filter plate. Rinse off. Thus, the stock solution passage is of course selectively connected to the stock solution source and the wash liquor outlet.

During each filtration operation, the filtration compression membrane 13 is compressed once and the cylindrical portion 13c is fatigued and does not shrink sufficiently to inhibit the flow of the stock solution, but the filtration compression membrane 13 has two sheets. 13b is open enough to be continuous in the portion of the stock solution hole 10, and the molding is easy, and the cylindrical portion 13c forming the stock solution 10 as shown in the sheet 13d is swarmed from the sheet 13d. The thickness can be continuously increased without a portion, and such fatigue can be sufficiently prevented without reinforcing, and there is no problem in the airtightness in the end hole 10 due to the integral molding.

Claims (1)

Between the fixed end plate 4 and the movable end plate 5, a conventional filter plate 7 having a filter material 9, a substrate 11 of the same size as the conventional filter plate, and a surface abutted on both surfaces thereof. A filtration pressurizing membrane 13 having an uneven filtering surface 13a and forming a pressurizing chamber 12 between the respective surfaces of the substrate 11, and a press-fitting filter plate 8 having a filter material 9 deposited on the surface thereof. In the pressurized fluid supply path (19'b) to the pressurizing chamber (12) on the substrate to supply pressure fluid, the filtration to contact the surface of the substrate (11) The compressed membrane 13 connects the two flexible hermetic sheets 13b at the cylindrical portion 13c passing through the opening 11a of the substrate so that the cylindrical inner hole forms the stock solution hole 20. And the opening 11a of the substrate is formed to a size that allows one side of the flexible hermetic sheet 13b to roll in and pass therethrough. In the gap between the opening 11a and the tubular portion 13c of the filtration crimp film 13, rings 25 and 26 for preventing mutual displacement are inserted, and grooves on the outer periphery of the rings 25 and 26 are formed. 25b is engaged with the annular protrusion 11b of the opening 11a of the substrate, and the groove 25a of the inner circumference of the ring is formed to fit the annular protrusion 13d of the tubular portion 13c of the filtration crimp film. Filtration crimp filter press, characterized in that.

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