JPH0560968B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for inspecting a compressed membrane of a filter press that can detect damage to the compressed membrane in a compressed filter press, and a filter press used in the method.

BACKGROUND ART Conventionally, this type of filter press has been known to have various structures. For example, compressed filter plates with compressed membranes attached to both sides of the filter plate body and ordinary filter plates consisting of filter plate bodies without compressed membranes are arranged alternately, and a pair of filter cloths is arranged between each adjacent filter plate. At the same time, ears projecting in the lateral direction are formed on the upper and lower sides of each filter plate, respectively, and a through hole is formed in each ear that penetrates in the thickness direction to provide a filtrate discharge port and a pressurized fluid supply port. There is something that consists of In such a filter press, after each filter plate is tightened, a stock solution is supplied into a filter chamber between a pair of filter cloths between adjacent filter plates, and then pressurized fluid is supplied to the above-mentioned compressed filter plate to form a compressed membrane. is expanded to compress and filter the stock solution supplied into the filter chamber between the pair of filter cloths between the compressed filter plate and the ordinary filter plate.

In such a filter press, if the squeezing membrane is torn or torn and damaged, the squeezing pressure decreases and the undiluted solution cannot be squeezed sufficiently. Therefore, the following methods are known for detecting this damaged compressed membrane. That is, if it is found that the squeezing pressure has decreased in any of the squeezing filter plates, after loosening the tightening of the filter plate, one of the through holes of the squeezing filter plate where the squeezing membrane is thought to be damaged is removed. After removing the packing of the two pressurized fluid supply ports and replacing the packing with a seal body without a through hole in the openings on both sides of the pressurized fluid supply port, closing both of the openings,
Pressurized air for testing is injected into the pressurizing chamber of the compressed filter plate from a supply pipe provided at the ear of the compressed filter plate and communicating with the pressurized fluid supply port.
If the pressure gauge attached to the supply pipe does not reach the specified pressure, it is thought that the compressed membrane is damaged and pressurized air is leaking from the damaged part, and the compressed filter plate is damaged. This means that the compressed membrane is damaged.

Problems to be Solved by the Invention However, in the above-mentioned method for inspecting compressed membranes, it is necessary to replace the packing of the pressurized fluid supply port of the compressed filter plate with a sealing body, and the replacement work is complicated. The thickness of the membrane and the thickness of the seal body are not necessarily the same, and due to the difference between the thickness of the squeezed membrane and the thickness of the seal body, the pressurized fluid for inspection may leak out of the filtration chamber, causing damage to the squeezed membrane. In addition to not being able to properly inspect the packing, there is a risk that the packing may be deformed when it is replaced, and the thickness of the packing may change when it is reattached.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems by providing a filter press that does not require replacing the packing of the through-hole of the press filter plate and can reliably detect damaged press membranes. An object of the present invention is to provide a method for inspecting compressed membranes and a filter press used in the method.

Means for Solving the Problems In order to achieve the above object, the present invention does not block the pressurized fluid supply through-hole on the compressed filter plate side, but instead closes the pressurized fluid supply through-hole on the normal filter plate side. The plate discharge through hole is configured to be closed. That is, ordinary filter plates having a filter plate body and compressed filter plates having a compressed membrane attached to the filter plate body are arranged alternately, and a pair of filter cloths is arranged between each adjacent filter plate, and each filter plate is A filtrate discharge through hole that penetrates in the thickness direction of each filter plate in the ear portion that protrudes laterally from the side of each filter plate and that can communicate with the filtration surface of each filter plate; The compressed filter plate has a pressurized fluid through-hole for supplying pressurized fluid that expands the compressed membrane, and when the filter plate is tightened, the through-hole of the ordinary filter plate and the compressed filter plate are connected to each other. The through-holes communicate with each other, and the pressurized fluid discharge means communicates with the filtrate discharge through-hole of any one of the compressed filter plates and can be opened and closed, and the compressed membrane of the compressed filter plate At the time of damage inspection, detecting a damaged compressed membrane in the compressed filter plate of a filter press equipped with a closing member made of a box-shaped seal body having a closed surface that closes openings on both sides of the filtrate discharge through hole of the ordinary filter plate. In a method for inspecting a compressed membrane of a filter press, after the compressed filter plate and the ordinary filter plate are tightened together, a stock solution is supplied, and then,
During a filtration process in which pressurized fluid is supplied to each compressed filter plate through the pressurized fluid through-hole to expand the compressed membrane, when a decrease in the compressed pressure by the compressed membrane is detected, the compressed filter plate and a step of loosening the tightening of the ordinary filter plate, and attaching the closing member to the filtrate discharge through hole of the ordinary filter plate adjacent to the compressed filter plate to be inspected, and fixing the through hole to the compressed filter plate to be inspected. After closing the filtrate discharge through-hole, and tightening the compressed filter plate and the ordinary filter plate again, pressurized fluid is introduced into the compressed filter plate through the pressurized fluid through-hole. The step of supplying again and the step of inspecting the compressed membrane for damage by respectively opening and closing the discharge means communicating with the filtrate discharge through hole of the compressed filter plate are configured to be performed in sequence.

In addition, the present invention alternately arranges ordinary filter plates having a filter plate body and compressed filter plates in which a compressed membrane is attached to the filter plate body, and has ears protruding laterally from the sides of each filter plate. A filtrate discharge through hole that penetrates in the thickness direction of the filter plate and can communicate with the filtration surface of each filter plate, and a pressurized fluid that penetrates in the thickness direction of each of the filter plates and expands the compressed membrane of the compressed filter plate. a pressurized fluid through-hole for supplying pressurized fluid, and the through-hole of the ordinary filter plate and the through-hole of the compressed filter plate are made to communicate with each other when the filter plate is tightened. , a pressurized fluid discharge means that communicates with the filtrate discharge through-hole of any one of the compressed filter plates and can be opened and closed is provided, and when inspecting the compressed membrane damage of the compressed filter plate, the It is configured to include a closing member that is a box-shaped seal body having a closing surface that closes the openings on both sides of the filtrate discharge through port.

Effects and Effects of the Invention According to the above-mentioned configuration, during a compressed membrane inspection, after the filtrate discharge through hole of the ordinary filter plate adjacent to the compressed filter plate to be inspected is closed with the closing member, the pressurized fluid discharge means If the compressed membrane is opened and the pressurized fluid is discharged, the compressed membrane is damaged and the pressurized fluid is flowing from the filtration surface into the filtrate discharge through-hole. Therefore, in the compressed filter plate from which the pressurized fluid has been discharged from the above means, the compressed membrane is damaged. Therefore, damage to the compressed membrane of the compressed filter plate can be detected simply by blocking the filtrate discharge through-hole of the ordinary filter plate with the closing member, and there is no need to replace the packing of the through-hole of the compressed filter plate. Therefore, a compressed filter plate with a damaged compressed membrane can be reliably detected, and the packing will not be damaged. In addition, when inspecting the compressed membrane for damage, pressurized fluid is supplied to the pressurizing chamber through the pressurized fluid supply through-hole in the same way as when expanding the compressed membrane.
A special device for supplying pressurized fluid for inspection to the pressurizing chamber of each squeeze filter plate is not required.

In particular, in the filter press according to claim 3, when the through holes of the ears of the ordinary filter plate are closed, the pair of openings of the through holes are simultaneously closed by simply placing the closing member over the ears. On the other hand, since it is sufficient to simply pull out the closing member from the ear portion, the closing operation and the closing member removal operation can be performed extremely easily and reliably. In addition, by slightly loosening the tightening of each filter plate, the above-mentioned closing member can be placed over the ear of a normal filter plate to close it, or removed from the ear, resulting in very good workability. .

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

As shown in FIG. 1, the filter press according to the present embodiment alternately arranges compressed filter plates 1 having compressed membranes 1b and ordinary filter plates 2 between front and rear stands (not shown), and each adjacent filter A pair of filter cloths 3 between the plates 1 and 2,
3, each of the filter plates 1 and 2 has a through hole penetrating in the thickness direction of the filter plate, and the through holes of each of the filter plates 1 and 2 communicate with each other,
It is generally configured to include a discharge pipe 4 as a pressurized fluid discharge means that communicates with the through-hole of each of the compressed filter plates 1 and can be opened and closed.

As shown in FIGS. 1, 2, and 3, the compressed filter plate 1 is constructed by attaching a rubber compressed membrane 1b with unevenness to the front and back surfaces of a filter plate main body 1a, and the filter plate main body 1a and the compressed membrane 1b. A pressurized chamber is formed between the two. When pressurized fluid, for example pressurized air, is supplied into this pressurized chamber,
Both compressed membranes 1b, 1b are expanded relative to the filter plate main body 1a. On each side of the compressed filter plate 1, there are ears 1c that protrude laterally above and below, respectively.
. . , 1c are formed, and a through hole penetrating in the thickness direction is formed in each ear portion 1c. Among these through-holes, the through-holes on both sides of the lower part and the through-hole on the left side of the upper part in FIG.
b are communicated with each opening 1e on the surface through a communication path 1f, and the filtrate on the surface of the pressed membrane 1b is passed through the opening 1e and the communication path 1f to the filtrate outflow through-hole 1d.
I try to let it flow inside. Further, the upper right through-hole is a pressurized fluid supply through-hole 1h, and this through-hole 1h and the pressurizing chamber communicate with each other through a communication path 1i. An annular packing 5 is fitted into each of the above-mentioned through holes 1d and 1f, and an annular fin portion 5a of this packing 5 that protrudes toward the normal filter plate side is attached to the normal filter plate 2 when the filter plate is tightened. It comes into contact with the end surfaces of the through-holes of the opposing ear portions 2c, is elastically deformed, and comes into close contact, so that both the through-holes communicate with each other in a sealed state. In addition, a stock solution supply port 1j is formed in the center of the compressed filter plate 1, which penetrates through the filter plate 1. In addition, in FIG. 5, 11 is a guide rail that slides and guides the handle 1k of the compressed filter plate 1 between the front and rear stands (not shown), 12 is a link whose one end is pivoted to the handle 1k, 13 is a spring, Reference numeral 14 denotes a filter cloth hanging rod that is suspended and supported by the link 12 with a spring 13.

In addition, in the right ear part 1c of the lower part of the squeeze filter plate 1 in FIG. 5, as shown in FIGS. 4 will be provided. An on-off valve is attached to the discharge pipe 4, and this on-off valve can be opened and closed manually or automatically by operating a lever 6.

On the other hand, as shown in FIGS. 1, 3 and 4, the ordinary filter plate 2 has a filter plate main body 2a which does not have a compressed membrane and has a frame body and a filter bed formed with unevenness to form a filter surface. It consists of more. On each side of the ordinary filter plate 2, there are ears 2c that protrude laterally above and below, respectively.
..., 2c are formed, and a through hole penetrating in the thickness direction is formed in each ear portion 2c. Among these through-holes, the through-holes on both sides of the lower part and the through-hole on the left side of the upper part in FIG. Each opening 2e on the surface is communicated with a communication path 2f,
The filtrate on the surface of the filter plate main body 2a of the normal filter plate 2 is made to flow into the filtrate outflow through-hole 2d through the opening 2e and the communication path 2f. Further, when the normal filter plate 2 and the compressed filter plate 1 are tightened, each of the through holes 2d is communicated with each of the through holes 1d of the ear portion 1c of the compressed filter plate 1, and the above-mentioned The filtrate is discharged from a filtrate outflow system (not shown). Further, the right through-hole in the upper part is a pressurized fluid supply through-hole (not shown), and can communicate with the through-hole 1h of the upper ear part 1c of the compressed filter plate 1. Although not specifically shown, a stock solution supply port communicating with the stock solution supply port 1j of the press filter plate 1 is formed in the center of the filtration surface of the ordinary filter plate 2. Together with the supply port 1j, it constitutes a stock solution supply system.

Furthermore, the ears 1c, 1c, 1c on both sides of the lower part and on the left side of the upper part in FIG. 5 of the ordinary filter plate 2,
When the compressed membrane breakage is detected, a closing member 7, which is a box-shaped sealing body, is placed on each of them. That is, each closing member 7
As shown in FIG. 4, it has a rectangular parallelepiped shape and has an opening 7a only on the left side in the figure.
The ear portion 1c is inserted into the ear portion 1c, and the openings on both sides of the through hole 1d of the ear portion 1c are closed with the closing surfaces 7b. The material of the closing member 7 may be any material such as metal such as steel plate or synthetic resin. This closing member 7 simply connects the through hole 1
Since it only closes the opening d, rigidity is unnecessary and a thin one is preferable.

According to the above configuration, when performing filtration, after tightening the normal filter plate 2 and the compressed filter plate 1, for example, to the front stand side, the stock solution is supplied from the stock solution supply port to the pair of filters between the adjacent filter plates 1 and 2. Supply it into the filter chamber between the cloths 3 and 3 and start filtration. Then, pressurized fluid is supplied from the pressurized fluid supply through-hole into the pressurizing chambers of each compressed filter plate 1 to expand each compressed membrane 1b, and the stock solution in each filter chamber is compressed and filtered. At this time, due to a decrease in pressurized fluid pressure, the sound of pressurized fluid leaking, etc., the compressed membrane 1b
If it is found that the pressurized fluid is leaking due to damage to the filter plates, the supply of pressurized fluid is stopped and each filter plate 1,
Slightly loosen the tightening of 2. Then, the above-mentioned closing member 7 is respectively placed over the ears 2c, 2c on both sides of the lower part and the left ear part 2c on the upper part of all the ordinary filter plates 2, . . . , 2 in FIG. Next, tighten each filter plate 1, 2 again, and apply pressurized fluid to each filter plate 1, 2.
The pressurized fluid is supplied to the pressurizing chamber through the pressurized fluid supply through-hole 1h. If the compressed membrane 1b is damaged, the pressurized fluid will escape from the compressed membrane 1b and the compressed membrane 1
b, that is, to the normal filter plate side, and flows from the opening 1e of the compressed membrane 1b, through the communication path 1f, and into each filtrate discharge through-hole 1d. This inflowing pressurized fluid cannot flow into the normal filter plate 2 side because the through holes 2d, 2d of the adjacent normal filter plates 2 are closed by the closing members 7, 7.
It remains within the through hole 1d of the compressed filter plate 1. Next, the levers 6 of the discharge pipes 4 are rotated in order from one end of the filter plate group to open the on-off valves of all the discharge pipes 4. Then, in the compressed filter plate 1 where the compressed membrane 1b is damaged, the pressurized fluid leaks from the compressed membrane 1b, flows into the filtrate discharge through-hole 1d, and remains there, so that the discharge pipe 4
is discharged from. Therefore, when the pressurized fluid is discharged from the discharge pipe 4, it can be seen that the compressed membrane 1b of the compressed filter plate 1 to which the discharge pipe 4 is attached is damaged. In the compressed filter plate 1 in which the compressed membrane 1b is not damaged, the pressurized fluid does not flow into the filtrate discharge through-hole 1d, so even if the discharge pipe 4 is opened, no pressurized fluid is discharged. When a damaged compressed membrane 1b is detected, the on-off valve of the discharge pipe 4 is closed by operating the lever, and the damaged compressed membrane 1b is replaced as appropriate, and then the filtration work is performed again.

Note that when the compressed membrane 1b is damaged and the pressurized fluid leaks into the filter chamber, it may be possible that the pressurized fluid flows into the filter chamber of another filter plate through the stock solution supply port 1j. However, due to the resistance caused by the cake, the pressurized fluid does not easily flow into the stock solution supply port 1j, and more easily flows into the filtrate discharge through port 1d rather than the stock solution supply port 1d. Therefore, it is highly unlikely that more pressurized fluid would be discharged from the filtrate discharge through-hole 1d of the other filter plate than from the filtrate discharge through-hole 1d of the compressed filter plate 1 in which the compressed membrane 1b was damaged. Since more pressurized fluid is discharged from the compressed filter plate 1 with the compressed membrane 1b damaged than that of the compressed filter plate 1 with the other normal compressed membrane 1b, the compressed filter plate 1 with the compressed membrane 1b damaged can be accurately can be detected. It is even more preferable to provide the discharge pipe 4 at the filtrate discharge through-hole 1d which is located further away from the stock solution supply port 1j.

According to the above embodiment, the damaged press membrane 1b can be detected by simply closing the filtrate discharge through-hole 2d of the ordinary filter plate 2 with the closing member 7 and opening the discharge pipe 4. There is no need to replace the packing 5 of the through-hole 1d of the plate 1, a compressed filter plate 1 with a damaged compressed membrane 1b can be accurately detected, and the packing 5 is not damaged. In addition, when detecting damage to the compressed membrane 1b, pressurized fluid is supplied to the pressurized fluid supply through-hole 1 of each filter plate 1, 2 in the same way as when expanding the compressed membrane 1b.
Since the pressurized fluid is supplied to the pressurized chamber via h, a special device for supplying pressurized fluid for testing is not required. Moreover, when closing the through-hole 2d of the ear 2c of the ordinary filter plate 2, the pair of openings of the through-hole 2d can be closed at the same time by simply placing the closing member 7 over the ear 2c. Since it is sufficient to simply pull out the closing member 7 from the ear portion 2c, the closing operation and the operation of removing the closing member can be performed extremely easily and reliably. Further, by simply loosening the tightening of each filter plate 1 and 2 slightly, the closing member 7 can be placed over the ear portion 2c of the ordinary filter plate 2 to close it, or
It can be removed from the ear part 2c, resulting in very good workability.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various other embodiments. For example, the closing member 7 is not limited to the shape described above, and as shown in FIG. 6, for example, as shown in FIG.
and a notch 8 on the upper left side.
c may be formed to make it easier to cover the ear portion 2c to form the closure member 8. A handle 9 is fixed to this closing member 8, and a handle 9 is fixed to the ear part 2c.
It may also be possible to make it easier to attach and remove the device. Further, the closing member 7 is not limited to a box shape, and may be any type as long as it closes the openings on both sides of the through hole 2d of the ear portion 2c of the ordinary filter plate 2. It may also be a letter-shaped member. Further, although no packing was provided on the ear portion 2c of the ordinary filter plate 2, an annular packing may be provided in the same manner as in the compressed filter plate. In addition, in each of the filter plates 1 and 2, the filtrate discharge through hole and the pressurized fluid supply through hole are
The invention is not limited to the provision of ears 1c and 2c that protrude to the sides, but instead of protruding ears, through-holes may be formed at each corner of the square filter plate, and the through-holes may be used to discharge the filter plate. A through-hole may be configured for use and pressurized fluid supply. In addition, each filter plate 1, 2
The filter plate main body is not limited to having a frame body and a filter bed, but may be composed only of a frame body.

[Brief explanation of drawings]

FIG. 1 is a plan view of the main part of the filter press according to an embodiment of the present invention when inspecting a damaged squeeze membrane, FIG. 2 is a front view of the main part of the filter press, and FIG. 3 is a front view of the main part of the filter press. A side view of the essential parts of the filter press when inspecting a damaged compressed membrane in the filter press, FIG. 4 is a front view of the essential parts of the ordinary filter plate with the closing member covered, and FIG. 5 is the compressed filter plate. FIG. 6 is a front view and a perspective view showing a modification of the closing member. 1... Press filter plate, 1a, 2a... Filter plate body, 1
b...Pressed membrane, 1c, 2c...Ear portion, 1d, 2d
...Filtrate discharge through port, 1e, 2e...Opening, 1
f, 2f... Communication path, 1h... Pressurized fluid supply through port, 1i... Communication path, 1j... Stock solution supply port, 1
k...Handle, 2...Ordinary filter plate, 3...Filter cloth, 4...
...Exhaust pipe, 5...Packing, 5a...Fin part,
6... Lever, 7, 8... Closing member, 7a, 8
a, 8b...opening, 9...handle, 11...guide rail, 12...link, 13...spring, 14...
...filter cloth hanging rod.

Claims (1)

[Claims] 1. Ordinary filter plates 2 having a filter plate body 2a and compressed filter plates 1 having a compressed membrane 1b attached to the filter plate body 1a are arranged alternately, and a pair of filter plates 2 and 1 are arranged between adjacent filter plates 2 and 1. The filter cloths 3, 3 are disposed, and each filter plate 2, 1 has an ear portion 2c, which protrudes laterally from the side of each filter plate 2, 1.
1c, filtrate discharge through holes 2d, 1d which penetrate in the thickness direction of the filter plate and can communicate with the filtering surfaces of the respective filter plates 2, 1; It has a pressurized fluid through-hole 1h for supplying pressurized fluid that expands the compressed membrane 1b, and when the filter plate is tightened, the through-hole 2d of the ordinary filter plate 2 and the pressurized filter plate 1 have a pressurized fluid through-hole 1h. Penetration holes 1d, 1h
and are provided with pressurized fluid discharge means 4, 6 which are openable and closable and communicate with the filtrate discharge through-hole 1d of any one of the compressed filter plates 1, and the compressed filter plates 1 The above-mentioned filtrate discharge through-hole 2 of the above-mentioned ordinary filter plate 2 during the compression membrane damage inspection
Damaged compressed membrane 1b in the compressed filter plate 1 of a filter press equipped with a closing member 7 made of a box-shaped seal body having a closing surface that closes the openings on both sides of d.
In a method for inspecting a compressed membrane of a filter press for detecting a Each squeeze filter plate 1 through
During the filtration process in which the compressed membrane 1b is expanded by supplying it to the compressed membrane 1b, when a decrease in the squeezing pressure by the compressed membrane 1b is detected, loosening the tightening of the compressed filter plate 1 and the ordinary filter plate 2; The closing member 7 is attached to the filtrate discharge through hole 2d of the ordinary filter plate 2 adjacent to the compressed filter plate 1.
and closing the through-hole 2d with respect to the filtrate discharge through-hole 1d of the compressed filter plate 1 to be inspected, and after tightening the compressed filter plate 1 and the ordinary filter plate 2 again, The pressurized fluid is passed through the pressurized fluid through-hole 1.
h, and opening and closing the discharge means 4 and 6, which communicate with the filtrate discharge through-hole 1d of the compressed filter plate 1, respectively, to prevent damage to the compressed membrane 1b. A method for inspecting a compressed membrane of a filter press, characterized in that the steps of inspecting are carried out in order. 2. An ordinary filter plate 2 having a filter plate body 2a and a compressed filter plate 1 having a compressed membrane 1b attached to the filter plate body 1a are arranged alternately, and a filter plate 2, which protrudes laterally from the side of each filter plate 2, 1, is arranged alternately. The ear portions 2c, 1c are provided with filtrate discharge through holes 2d, 1d that penetrate in the thickness direction of the filter plates and can communicate with the filtration surfaces of the respective filter plates 2, 1, and the above-mentioned compressor that penetrates in the thickness direction of each of the filter plates. It has a pressurized fluid through-hole 1h for supplying pressurized fluid that expands the compressed membrane 1b of the filter plate 1, and the pressurized fluid through-hole 2d of the ordinary filter plate 2 and the compressed membrane are provided when the filter plate is tightened. In a filter press in which the through-holes 1d and 1h of the filter plate 2 are communicated with each other, pressurization that communicates with the filtrate discharge through-hole 1d of any one of the compressed filter plates 1 and can be opened and closed. A box-shaped seal body that is equipped with fluid discharge means 4 and 6 and has a closing surface that closes openings on both sides of the filtrate discharge through hole 2d of the ordinary filter plate 2 when inspecting the compressed membrane damage of the compressed filter plate 1. A filter press characterized by comprising a certain closing member 7.