JP2013013839A - Filtration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filtration apparatus having lightweight filter bodies low in cost and not corroded with seawater.SOLUTION: The filtration apparatus includes a plurality of filter bodies 5 each having an open end plate 15 at one end in the direction of an axis 1 of a cylindrical filter medium 19, and a blocked end plate 16 at the other end; a base 4 holding the filter bodies 5 on one plate face side and formed with through-holes 4A, 4B, 4C; and a backwash mechanism 7 driving a backwash pipe 6 on the other plate face side of the base. The filtration apparatus further includes a raw water lead-in pipe 8 communicating with a second chamber 2B on the other plate face side of the base, and a filter discharge pipe 11 communicating with a first chamber 2A on one plate face side. A backwash water discharge pipe 9 is extended to the outside of a container from the second chamber 2B, and the open end plate 15 is connected to the blocked end plate 16 through support members 17. The filter medium 19 externally contacts the support members 17 to form cylindrical shape. The filter medium 19 is made of resin cloth composed of an inner layer 19C, an intermediate layer 19B, and an outer layer 19A, and having mesh opening of 1-10 mm in the inner layer, 10-50 μm in the intermediate layer, and 300-3,000 μm in the outer layer.

Description

  The present invention relates to a filtration device that filters seawater as a large amount of raw water, and more particularly to a filtration device for efficiently capturing and removing organisms contained in ballast water loaded in a ballast tank of a ship.

  In general, a ship with an empty load or a small load is filled with seawater as ballast water at the time of unloading because of the necessity of ensuring the depth of submersion of the propeller and ensuring safe navigation when empty. Conversely, when loading, ballast water is discharged into the sea. By the way, when ballast water is taken and drained by a ship that reciprocates between a loading port and an unloading port in different environments, organisms such as bacteria and plankton contained in the ballast seawater are brought in. There are concerns about adverse effects on coastal ecosystems. Therefore, in February 2004, an international convention for the regulation and management of ship ballast water and sediment was adopted at an international conference on ship ballast water management, and the treatment of ballast water became mandatory.

According to the standard established by the International Maritime Organization (IMO) as a treatment standard for ballast water, the number of organisms (mainly zooplankton) of 50 μm or more contained in the ballast water discharged from the ship is less than 10 in 1 m ³ , The number of organisms (mainly phytoplankton) of 10 μm or more but less than 50 μm is less than 10 in 1 mL, the number of Vibrio cholerae is less than 1 cfu in 100 mL, the number of E. coli is less than 250 cfu in 100 mL, and the number of enterococci in 100 mL Is less than 100 cfu.

  Many ballast water treatment technologies are currently under development. However, Patent Document 1 and Patent Document 2 disclose conventional techniques for chlorinating harmful plankton or harmful algae cysts contained in ballast water when discharging ballast water. A method of sterilization using a system disinfectant or hydrogen peroxide has been proposed.

  However, the number of organisms contained in seawater taken as ballast water varies greatly depending on the date and place where the seawater is collected, and ranges from several to several hundred million in 1 mL of seawater. For this reason, with the methods of Patent Document 1 and Patent Document 2, it is difficult to reliably achieve all the items of the standards defined by the International Maritime Organization (IMO). In particular, there is a problem that in order to kill relatively large zooplankton, there is no effect unless a large amount of bactericide is used. For this reason, there is a problem that the cost of the bactericidal agent is increased and a storage tank for storing a large amount of the bactericidal agent has to be provided, and there is a problem that there is a problem in a ship having a limited space. Further, when a large amount of the bactericidal agent is used, there is a problem that the influence on the environment due to the remaining bactericidal agent being discharged into the sea together with the ballast water cannot be ignored.

  Therefore, before supplying the disinfectant into the drawn seawater, the relatively large plankton is captured and removed by the filtration device, and the small plankton and bacteria are killed by the disinfectant to reduce the amount of disinfectant used. It is proposed.

  In addition, when the ballast water is loaded or drained, the biological treatment in the seawater is performed when the vessel is unloaded or loaded, and the biological treatment is completed within the cargo handling time. Therefore, it is necessary to feed or drain a large amount of seawater in a short time to perform biological treatment. When collecting organisms with a filtration device, a filtration device capable of performing a large amount of filtration in a short time is desired. . Therefore, in Patent Document 3, a plurality of filter bodies are provided so as to enable a large amount of processing, and a filtration area is enlarged, and heating means is provided inside the apparatus to bring it into a high temperature state to kill residual organisms. A filtering device has been proposed. In the above-mentioned Patent Document 3, the filter body has a cylindrical shape with one end opened in the axial direction and the circumferential surface is capable of passing water. Seawater is introduced from this opening, filtered at the circumferential surface, and discharged outside the circumferential surface. The The filter body is formed by winding a thin metal wire (notch wire) with protrusions formed at regular intervals close to each other in a coil shape around the cylindrical frame to form a cylindrical shape. A notch wire filter is formed in which openings are formed by protrusions therebetween. Since this notch wire filter is made of metal, this notch wire filter exhibits sufficient strength even during filtration and backwashing.

JP 04-322788 JP 05-000910 A JP2009-066533

  However, in patent document 3, improvement is calculated | required regarding the damage resulting from the corrosion of a notch wire, and the replacement | exchange about a filter body.

  First, since the notch wire is made of metal, there is a problem that when seawater is filtered, it is easily corroded by salt. If it corrodes, it will affect the opening of the filter body and also reduce the strength. In order to avoid such a problem, a stainless steel notch wire which is not easily corroded is used, but the stainless steel notch wire is expensive.

  Next, the notch wire filter is formed by spirally winding a notch wire around a plurality of columnar supports that connect the upper plate and the lower plate at their peripheral edges, with one end of the notch wire being the upper plate and the other end being the lower side. The notch wire is completely integrated with the upper and lower plates. Therefore, to improve the performance of the degraded filter body, the entire filter body must be replaced with a new one. This is economically disadvantageous.

  Furthermore, unlike using a commercially available filter cloth, the filter body must be manufactured by winding a notch wire around the support material having the above-described structure for each filter body, resulting in an increase in manufacturing cost.

  In view of such circumstances, an object of the present invention is to provide a filtration device having a filter body that is not corroded by seawater and can be manufactured at a low cost.

  The present invention is broadly classified into a first invention having a backwashing mechanism only on one end side of the filter body and a second invention having both ends.

<First invention>
The filtration device according to the present invention includes a plurality of filter bodies provided with a cylindrical filter medium at a peripheral portion, an open end plate at one end in the central axial direction, and a closed end plate at the other end, and a plate shape. The filter body is held at the opening end of the filter body on one plate surface of the substrate at a plurality of circumferential positions around the central axis perpendicular to the center, and a through-hole that penetrates in the thickness direction communicates with the inside of the filter body. A substrate formed at a position where the substrate is formed, a container for storing an assembly formed by holding the plurality of filter bodies by the substrate, and a backwash provided in the container on the other plate surface side of the substrate. A backwashing mechanism for driving the tube, and the space in the container is divided into a first chamber on one plate surface side of the substrate and a second chamber on the other plate surface side. A raw water introduction pipe communicating with the first chamber and a filtration discharge pipe opening communicating with the first chamber, and a backwash water discharge pipe communicating with the backwash pipe And it extends to the outside of the container from the chamber.

  In such a filtration device, in the first invention, the open end plate and the closed end plate of the filter body are connected by a support member provided at a peripheral portion so as to allow water to pass through the filter medium. The filter material is formed in a cylindrical shape so as to be circumscribed by the support material so that the material is supported by the support material. The filter material is formed of a filter cloth made of resin cloth including an inner layer, an intermediate layer, and an outer layer. The cloth is characterized by being a resin cloth having an inner layer opening of 1 to 10 mm, an intermediate layer opening of 10 to 50 μm, and an outer layer opening of 300 to 3000 μm.

<Second invention>
The filtration device according to the present invention includes a plurality of filter bodies provided with a cylindrical filter medium in the peripheral portion and provided with open end plates at both ends in the central axial direction, and a plate-like shape around a central axis perpendicular to the plate surface. Through holes are formed at a plurality of positions in the circumferential direction at positions where the filter body is held by the opening end of the filter body on one plate surface of the substrate and penetrates in the plate thickness direction so as to communicate with the inside of the filter body. Two substrates, a container for housing an assembly formed by holding the plurality of filter bodies by the substrates, and a reverse driving the backwash tube provided in the container located on the other plate surface side of the substrate. A cleaning mechanism, and divides the space in the container into two first chambers on one plate surface side of the substrate and two second chambers on the other plate surface side by two substrates. A raw water introduction pipe communicating with the second chamber and a filtration discharge pipe port communicating with the first chamber are provided, and the reverse communication communicating with the backwash pipe is provided. Water discharge pipe is extended outside the container from the two second chambers.

  In such a filtration device, in the second invention, the open end plates at both ends of the filter body are connected by a support material provided at a peripheral portion so as to allow water to pass into and out of the filter material. The support material has a cylindrical shape that circumscribes the support material, and the filter material is formed of a filter cloth made of resin cloth including an inner layer, an intermediate layer, and an outer layer. The resin cloth is characterized in that the inner layer has an opening of 1 to 10 mm, the intermediate layer has an opening of 10 to 50 μm, and the outer layer has an opening of 300 to 3000 μm.

  According to the filtration device of the first and second inventions having such a configuration, raw water such as seawater is introduced into the second chamber of the container from the raw water inlet, enters the filter body through the through hole of the substrate, and the filter body. Permeated through the filter medium disposed in the periphery of the water, the filtered water reaches the first chamber, and is taken out from the container through the filtered water discharge port.

  On the other hand, in the filter body in which the backwash pipe of the backwash mechanism is located, since the backwash pipe is present, raw water cannot flow into the filter body from the second chamber. The filtered water enters the filter body through the filter material in the periphery. At that time, the filtered water removes deposits on the inner surface of the filter medium. And filtered water is discharged | emitted out of a container from a backwash water discharge pipe through a backwash pipe with this deposit. Since the backwash tube rotates about the central axis, the target filter body in which the backwash tube is located changes sequentially, so that the filter bodies are always backwashed one after another while filtering the raw water.

  The filter medium in the filter body of the present invention is formed of a filter cloth made of resin cloth consisting of an inner layer, an intermediate layer, and an outer layer. The filter cloth has an inner layer opening of 1 to 10 mm and an intermediate layer opening of 10 to 50 μm. And a resin cloth having an outer layer opening of 300 to 3000 μm. The intermediate layer having a small mesh size determines the particle size that can be filtered, that is, the filtration performance. Since the filter medium itself is a filter cloth made of resin cloth, it is lightweight and does not cause the problem of corrosion by seawater. During filtration and backwashing, the inner and outer layers reinforce and protect the intermediate layer.

  In the filter medium, raw water is transmitted from the inside to the outside when the raw water is filtered, and the filtered water is transmitted from the outside to the inside during backwashing. In the above filter medium, solid matter adheres to the intermediate layer during filtration, and the opening is gradually closed, the intermediate layer is subjected to pressure on the outside, and the intermediate layer alone has a risk of extending to the outside and breaking. However, since the outer layer suppresses the extension of the intermediate layer, the intermediate layer can be prevented from being broken. On the other hand, solid matter adheres to the intermediate layer during backwashing, and the intermediate layer is subjected to pressure on the inside, and the intermediate layer alone can stretch and break inside, and the intermediate layer can be used as a support for the filter medium. Although there is a risk of contact abrasion and breakage, the inner layer suppresses the extension of the intermediate layer, and the inner layer is between the support member of the filter body, so that the breakage of the intermediate layer can be prevented. Since the inner layer and the outer layer have a larger opening than the intermediate layer, the inner layer and the outer layer have no influence on the filtration performance in the intermediate layer.

  In the production of the filter medium, among the commercially available filter cloths made of resin cloth, those having the mesh openings are selected and employed as the inner layer, the intermediate layer, and the outer layer, and welded at appropriate places, for example, at the periphery. It can be integrated into a single sheet by means of, for example, and it can be easily placed around the support material and attached to the open end plate or the closed end plate. In other words, at the time of maintenance, it is only necessary to remove only the filter medium from the open end plate and the closed end plate without removing the entire filter body. This not only facilitates replacement work, but is also economically advantageous.

  In the present invention, the filtering material is provided on each peripheral surface of the open end plate and the closed end plate via a cushioning material disposed in an attachment groove formed on each peripheral surface of the open end plate and the closed end plate. It can be held by a clamp band. By using the cushioning material and clamp band, it is possible to prevent the filter medium from being damaged when the filter medium is attached to the open end plate or the closed end plate, during filtration and backwashing, and it is very easy to install and remove. It becomes.

  In the present invention, as described above, the filter medium disposed on the periphery of the cylindrical filter body is a resin cloth filter cloth composed of an inner layer, an intermediate layer, and an outer layer, and an intermediate for determining the filtration particle size. Since the intermediate layer is reinforced with an inner and outer layer having a smaller mesh number than the layer, the strength of the filter medium can be secured while maintaining the filtration performance in the intermediate layer, and it is not corroded even during seawater filtration. Furthermore, it becomes possible to easily remove only the filter medium without removing the entire filter body during maintenance.

1 is a partially cutaway front view of an embodiment of the present invention and a filtration device. It is a disassembled perspective view about one of the several filter body used for the filtration apparatus of FIG. It is a figure which isolate | separates and shows each layer about the filter material used for the filter body of FIG. 2 in the expansion | deployment state.

  The filtration device of the present embodiment shown in FIG. 1 includes a bottomed cylindrical container body 2 having a vertical center axis 1, a lid 3 attached to the upper opening of the container body 2 in a watertight state, and the container A substrate 4 that partitions the interior of the container body 2 into an upper chamber 2A that is a first chamber and a lower chamber 2B that is a second chamber at a lower portion of the main body 2, and a plurality of cylindrical shapes that are attached to the upper surface of the substrate 4 and extend upward. The filter body 5 is further provided with a backwash tube 6 that rotates in sliding contact with the lower surface of the substrate 4 and a drive mechanism 7 that rotationally drives the backwash tube 6.

  The container body 2 has a seawater introduction pipe 8 as a raw water introduction pipe so as to communicate with the lower chamber 2B at one place in the circumferential direction, and communicates with the lower chamber 2B at other places in the circumferential direction. The drain pipes 10 are connected via flanges so that the backwash water discharge pipe 9 is further communicated with the lower chamber 2B at the bottom. A first on-off valve 8A, a second on-off valve 9A, and a third on-off valve 10A are attached to the seawater introduction pipe 8, the backwash water discharge pipe 9, and the drain pipe 10, respectively.

  Further, a filtered water discharge pipe 11 is connected to the container body 2 so as to communicate with the upper chamber 2A at one place in the circumferential direction at the upper portion of the upper chamber 2A. A fourth on-off valve 11A is attached to the filtered water discharge pipe 11.

  The substrate 4 that partitions the upper chamber 2A and the lower chamber 2B includes a plurality of (three in the example of FIG. 1) circles that are concentric with the central axis 1 and a plurality of radial lines that are directed toward the central axis 1. Through holes 4A, 4B, and 4C that penetrate in the thickness direction are formed at the intersection positions. On the upper surface of the substrate 4, a filter body 5 described later is vertically attached so as to communicate with each of the through holes 4 </ b> A, 4 </ b> B, 4 </ b> C.

  The backwash tube 6 slidably rotating on the lower surface of the substrate 4 extends from one end at the position of the central axis 1 so as to have the other end in the vicinity of the circumferential surface of the container body 2 outward in one radial line direction. . The backwash pipe 6 is formed with connecting ports 6A, 6B, 6C protruding upward from the central axis 1 at positions equal to the radius of each circle where the through holes 4A, 4B, 4C are located. The connection ports 6A, 6B, 6C are in sliding contact with the lower surface of the substrate 4. The backwash tube 6 has one end that is the position of the central axis 1 opened and the other end closed. One end of the backwash pipe 6 that is open is connected integrally so as to communicate with the connecting pipe 12 located on the central axis 1. The connecting pipe 12 has an upper end closed and a lower end opened. The lower end of the connecting pipe 12 that opens is inserted into a receiving box 12A provided at the bottom of the container body 2, and is rotatable relative to the upper plate of the receiving box 12A around the central axis in a watertight state. It is supported. The aforementioned backwash water discharge pipe 9 is connected to the receiving box 12A.

  At the time of backwashing, the backwash pipe 6 communicates with the outside of the container, the pressure at the connection ports 6A, 6B, 6C is atmospheric pressure, and the through holes 4A, 4B, 4C are connected to the connection ports 6A, 6B, 6C. At the time of contact, the outside of the filter body 5 is subjected to filtered water pressure and the inside is atmospheric pressure, and the pressure outside the filter body 5 is higher than the inside, so that the filtered water flows from the outer periphery of the filter body through the filter medium and flows into the inside. Then, the adhering matter adhering to the inner surface of the filter medium is backwashed and discharged out of the container together with the filtered water.

  A drive mechanism 7 is connected to the backwash tube 6. The drive mechanism 7 includes a motor 14 with a speed reducer 13 provided on the outer surface of the lid 3 of the container, and a drive shaft that hangs down from the speed reducer 13 and enters the upper chamber 2A of the container and extends on the central axis 1. 13A, and the lower end of the drive shaft body 13A is connected to the upper end of the connecting pipe 12. Thus, the rotation of the motor 14 is decelerated by the speed reducer 13, transmitted to the drive shaft body 13 </ b> A, and the backwash pipe 6 integrally connected to the upper end of the connecting pipe 12 rotates around the central axis 1. It becomes like this. Due to the rotation of the backwash tube 6, the connection ports 6A, 6B, 6C of the backwash tube 6 move in the circumferential direction and communicate with the through holes 4A, 4B, 4C of the substrate 4 one after another.

  The filter body 5 attached to the positions of the through holes 4A, 4B, 4C with respect to the upper surface of the substrate 4 is, as shown in FIG. 2, an annular plate-shaped open end plate 15 positioned at the lower end and positioned at the upper end. A frame 18 formed by connecting the disk-shaped closed end plates 16 to each other by a columnar support member 17, a tubular filter medium 19 attached to the frame 18, and a frame body of the filter medium 19 18 and a clamp band 20 as an attachment used for attachment to 18.

  The open end plate 15 and the closed end plate 16 have the same outer diameter and are the same in that annular mounting grooves 15A and 16B for the clamp band 20 are formed on the peripheral surface. This is different from the closed end plate 16 in that an opening 15B is formed through the center. The inner diameter of the opening 15B of the opening end plate 15 is substantially the same as the inner diameter of the through holes 4A, 4B, 4C of the substrate 4. The open end plate 15, the closed end plate 16, the support member 17 and the clamp band 20 are preferably made of stainless steel or anticorrosive coated so as not to be corroded by seawater. The open end plate 15 and the closed end plate 16 are connected by a long and narrow columnar support member 17 arranged in parallel at a plurality of positions in the circumferential direction in the vicinity of their peripheral edges, and are integrated as a frame 18. . The intervals between the support members 17 are appropriately arranged so that the filter material 19 does not sag in the intervals between the support members 17.

  As shown in FIG. 2, clamp bands 20 for attaching a filter medium 19 to be described later are attached to the mounting groove portions 15A and 16A, respectively, by mounting groove portions 15A and 16A formed on the peripheral surfaces of the opening end plate 15 and the closed end plate 16. An elastic metal band with a width that fits in a substantially ring shape that is open at one place, a protrusion 20A is formed at one end in the circumferential direction, and a locking hole 20B is formed at the other end adjacent thereto, After the clamp band 20 is arranged on the outer periphery of the filter material, which will be described later, the filter material 19 is fixed to the opening end plate 15 and the closed end plate 16 by locking the protrusion 20A in the locking hole 20B in a snap shape. Hold tightly. The clamp band 20 is preferably used so that the filter medium is tightly held against the support member 17 even at an intermediate position between the open end plate 15 and the closed end plate 16. It is preferable that the mounting groove portions 15A and 16A are provided with a packing material or a sealant applied to the filter material 19 as a buffer material.

  As shown in FIG. 3, the filter medium 19 formed from a resin cloth filter cloth is formed by superposing three kinds of resin cloth filter cloths made of resin yarns into an outer layer, an intermediate layer, and an inner layer. At the same time, as shown in FIG. 1, the peripheral edge portions at both ends and the joining edge in the circumferential direction are welded to form a cylindrical body.

  The resin cloth of the filter cloth is made of, for example, any one of polyester, polyethylene, nylon, polypropylene, polyarylate, Teflon (registered trademark), etc., for the outer layer, the intermediate layer, and the inner layer. As seen in FIG. 3, the outer layer 19A, the intermediate layer 19B, and the inner layer 19C of the filter medium 19 preferably have an opening of the outer layer 19A of 300 to 3000 μm, an opening of the intermediate layer 19B of 10 to 50 μm, and The inner layer 19C is a resin cloth having an opening of 1 to 10 mm. At that time, the thickness of the yarn forming the resin cloth filter cloth increases in the order of the intermediate layer 19B, the outer layer 19A, and the inner layer 19C.

  As described above, the three types of filter cloth constituting the outer layer 19A, the intermediate layer 19B, and the inner layer 19C are cut into appropriate dimensions to form the cylindrical filter body 5 of FIG. A single sheet is formed by sewing or welding with resin, and then rolled into a cylindrical shape, and then the circumferential edges 19-2 are joined together by sewing or welding with a resin, as shown in FIG. The filter medium 19 is formed.

  As shown in FIG. 2, the filter medium 19 formed in this way is a frame body of a frame body 18 in which cushioning materials such as a sealant are arranged in advance in the mounting groove portions 15 </ b> A and 16 </ b> A of the open end plate 15 and the closed end plate 16. After being extrapolated from one end side of 18, it is clamped and held around the opening end plate 15 and the closed end plate 16 by the clamp band 20 at the positions of the mounting groove portions 15 </ b> A and 16 </ b> A from the outside. Further, it is desirable that the filter medium 19 is held tightly to the support material 17 by the clamp band 20 even at an intermediate position between the open end plate 15 and the closed end plate 16. The filter body 5 thus configured is attached to the upper surface of the substrate 4 in an easily attachable / detachable state at a position where the opening 15B of the opening end plate 15 coincides with the through holes 4A, 4B, 4C of the substrate 4. It is done.

  The filtration device of this embodiment configured as described above is filtered, backwashed, and maintained in the following manner.

<At the time of filtration and backwashing>
First, the first, second, and fourth on-off valves 8A, 9A, and 11A are opened and the third on-off valve 10A is closed, and raw water, for example, seawater before filtration, is introduced from the seawater introduction pipe 8 into the container. This raw water enters the lower chamber 2B of the container, as shown by a solid arrow in FIG. 1, and then flows into the corresponding filter body 5 through the through holes 4A, 4B, 4C of the substrate 4 from here. Furthermore, raw | natural water permeate | transmits the filter medium 19 which makes the periphery of the filter body 5, and reaches the upper chamber 2A. At that time, the raw water is filtered by the filter medium 19 and enters the upper chamber 2A as filtered water. This filtered water flows out from the filtered water discharge pipe 11 to the outside of the container.

  At the time of filtering the raw water, the drive shaft 13A of the backwashing mechanism 7 is rotated by receiving the driving force from the motor 14 with the speed reducer 13, and the backwashing pipe 6 has the connection ports 6A, 6B, and 6C connected to the substrate 4. Rotating around the central axis 1 while being in sliding contact with the lower surface of. Accordingly, the connection ports 6A, 6B, and 6C are intermittently communicated with the through holes 4A, 4B, and 4C of the substrate 4 one after another while rotating. The raw water from the lower chamber 2B cannot flow into the through-holes 4A, 4B, 4C of the substrate 4 communicating with the connection ports 6A, 6B, 6C of the backwash pipe 6, and conversely, the filtration in the upper chamber 2A A part of the water passes through the filter medium 19 that is a peripheral portion of the filter body 5 located corresponding to the backwash pipe 6 and flows into the filter body 5. At that time, the filtered water flowing into the filter body 5 separates the filtration residue adhering to the inner surface of the filter material 19 during filtration from the peripheral portion, that is, backwashes, and flows into the backwash tube 6 together with the filtration residue. . The filtered water with the deposits flows through the connecting pipe 12 and is discharged out of the backwash water discharge pipe 9 through the receiving box 12A. Thus, in the container, the filter body 5 is always backwashed sequentially using a part of the filtered water while the raw water is being filtered.

<During maintenance>
At the time of maintenance and inspection of the filtration device, the condition is confirmed by removing a specific or all of the filter bodies 5 from the substrate 4 with the lid 3 removed and the filter bodies 5 being exposed, and taking out to the outside. Is exchanged. Further, when it is desired to take out all the filter bodies 5 out of the container at once, they can be taken out together with the substrate 4 as an assembly.

  The filter medium 19 in the filter body 5 can be easily replaced by removing the clamp band 20 of the filter body 5. The cleaning of the container body 2 is performed with the first, second and fourth on-off valves 8A, 9A, 11A closed and the third on-off valve 10A open, and the liquid after cleaning is discharged from the drain pipe 10. The

  In the present embodiment, the filtering device has been described as a form in which the first chamber in the container is the upper chamber and the second chamber is the lower chamber. However, the first chamber and the second chamber have a positional relationship that is upside down. Or the horizontal position of the device may cause a positional relationship between the left and right.

  Furthermore, in the present invention, two substrates are arranged so that both ends of the filter body are open end plates, and the through hole communicates with the inside of the filter body by both of these open end plates, so that one first chamber is provided. Two second chambers may be formed, and a backwashing mechanism may be provided in each second chamber. Since backwash water is introduced from both filter bodies and backwashed, the deposits can be backwashed and removed efficiently and reliably.

DESCRIPTION OF SYMBOLS 1 Center axis 2A Upper chamber 2B Lower chamber 4 Substrate 4A, 4B, 4C Through-hole 5 Filter body 8 Seawater introduction pipe 9 Backwash water discharge pipe 11 Filtration water discharge pipe 15 Opening end plate 16 Closed end plate 17 Support material 19 Filter material 19A Outer layer 19B Middle layer 19C Inner layer 20 Clamp band

Claims (3)

A plurality of filter bodies that are provided with a cylindrical filter medium on the periphery and have an open end plate at one end in the central axial direction and a closed end plate at the other end, and a periphery around the central axis that is plate-shaped and perpendicular to the plate surface A substrate in which a through hole that holds the filter body at the opening end of the filter body and penetrates in the plate thickness direction on one plate surface of the substrate is formed at a position that communicates with the inside of the filter body at a plurality of positions in the direction. A container for housing an assembly formed by holding the plurality of filter bodies on a substrate, and a backwash mechanism for driving a backwash tube provided in the container on the other plate surface side of the substrate; A space in the container is divided into a first chamber on one plate surface side of the substrate and a second chamber on the other plate surface side, and the container has a raw water introduction pipe and a second chamber communicating with the second chamber. A filtration discharge pipe port communicating with one chamber is provided, and a backwash water discharge pipe communicating with the backwash pipe extends from the second chamber to the outside of the container. In the filtration device according to Rukoto,
The open end plate and the closed end plate of the filter body are connected to each other by a support member provided on the periphery so as to allow water to pass into and out of the filter material, and the filter material is supported by the support material. The filter material is formed in a cylindrical shape by circumscribing the support material, and the filter material is formed of a filter cloth made of a resin cloth including an inner layer, an intermediate layer, and an outer layer. A filtration device characterized by being a resin cloth having a size of 10 mm, an opening of an intermediate layer of 10 to 50 μm, and an opening of an outer layer of 300 to 3000 μm. A plurality of filter bodies provided with cylindrical filter media on the periphery and provided with open end plates at both ends in the central axial direction, and a plurality of filter bodies in the circumferential direction around the central axis perpendicular to the plate surface. Two substrates in which a through-hole that holds the filter body at the opening end of the filter body and penetrates in the thickness direction on one plate surface is formed at a position communicating with the inside of the filter body; A container that contains an assembly formed by holding a filter body with a substrate, and a backwashing mechanism that drives a backwashing tube that is located on the other plate surface side of the substrate and is provided in the container. The inner space is divided into two first chambers on one plate surface side of the substrate and two second chambers on the other plate surface side by two substrates, and the container introduces raw water that communicates with one second chamber The second chamber has two backwash water discharge pipes provided with a filtration discharge pipe port communicating with the first chamber and the backwash pipe. In the filtration device according to the extend to Luo outside of the container,
The open end plates at both ends of the filter body are connected by a support material provided on the periphery so as to allow water to pass through the filter material, so that the filter material is supported by the support material. The filter medium is circumscribed to form a cylindrical shape, and the filter medium is formed of a filter cloth made of resin cloth including an inner layer, an intermediate layer, and an outer layer, and the filter cloth has an inner layer opening of 1 to 10 mm, A filtration apparatus comprising a resin cloth having an opening of an intermediate layer of 10 to 50 µm and an opening of an outer layer of 300 to 3000 µm.   The filter medium is held by clamp bands on the respective peripheral surfaces of the open end plate and the closed end plate via cushioning materials disposed in the mounting groove portions formed on the peripheral surfaces of the open end plate and the closed end plate. The filtration device according to claim 1 or 2, wherein the filtration device is configured.

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