JP2007000805A - Multiple circular disc dehydration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of parts by integrating a circular disc constituting a filter medium and a spacer and to realize reduction of a cost in a multiple circular disc dehydration apparatus. <P>SOLUTION: The multiple circular disc dehydration apparatus is provided with a group of filter media in which a required number of filter media constituted by fitting circular discs on a rotatable shaft body in multiple while interposing the spacers having a smaller diameter than the circular disc are continuously provided such that a part of the circular discs is superposed and in which a treatment article to be dehydrated is filtered from a gap of the superposed part of the circular disc. At least one filter medium of the group of the filter media includes a circular disc 47 with a spacer in which the circular disc 31 and the spacer 32 are integrally molded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multiple disk dewatering device that separates solids and filtrate by subjecting a material to be dewatered such as sewage sludge, human waste sludge, and other industrial waste sludge to filtration.

  A multi-disk dewatering device is one of filtration devices that separates solids and filtrates by subjecting a material to be dewatered such as sewage sludge, human waste sludge, and other industrial waste sludge.

  Conventionally, as a multiple disk dewatering device, there are those shown in Patent Literature 1 and Patent Literature 2. An outline of such a multiple disk dewatering apparatus will be described with reference to FIGS.

  The multiple disk dewatering apparatus mainly includes a multiple disk dewatering machine 1 and an aggregating device 2 connected to the multiple disk dewatering machine 1.

  In the multiple disk dehydrator 1, an upper filter body group 4 and a lower filter body group 5 are arranged in the dehydration tank 3 so as to form a cake transport path 6. The cake transport path 6 The sectional area gradually decreases toward the downstream side, the downstream end opens on the wall surface of the dehydration tank 3 to form the discharge port 10, and the upstream side of the upper filter group 4 is connected to the lower filter group 5. On the other hand, the upper surface of the upstream end portion of the cake conveying path 6 is open.

  The upper filter body group 4 and the lower filter body group 5 are configured so that a required number of filter bodies 7 are partially polymerized, and the filter bodies 7 are formed on both side walls of the dehydration tank 3. The upper filter body group 4 and the lower filter body group 5 are driven so as to rotate toward the downstream side by a driving device (not shown).

  In the filter body 7, a large number of disks 9 and spacers 20 are alternately mounted on the rotary shaft 8, and the disks 9 and 9 of the adjacent filter bodies 7 and 7 have peripheral portions in the gaps formed by the spacers 20. It is inserted so that a part thereof is polymerized, and a gap formed between the discs 9 and 9 of the adjacent filter bodies 7 and 7 serves as an eye for filtering the liquid. The filter body 7 is formed with a filtrate passage 11 that penetrates the disk 9 and the spacer 20 in the axial direction.

  For each required number of spacers 20, for example, every five, a notch 40 is formed in the outer periphery of the spacer 20, and the filtrate passage 11 is opened by the notch 40 (FIG. 13). Middle, 20a). Accordingly, the filtered filtrate leaks to the filtrate passage 11 through the notch 40, and the filtrate passage 11 guides the leaked filtrate to the shaft end of the filter body 7, and from the side wall of the dehydration tank 3. It comes to discharge.

  The aggregating apparatus 2 has an aggregating tank 12, and the aggregating tank 12 is connected to the dehydrating tank 3 through an aggregating stock solution supply port 13. The coagulation tank 12 is connected to a stock solution supply line 14 and a coagulation liquid supply line 15. The coagulation tank 12 is supplied with a stock solution from the stock solution supply line 14 by a stock solution supply pump 16, and from the aggregate solution supply line 15. The aggregating liquid is supplied from the aggregating liquid supply pump 17.

  The agglomeration tank 12 is provided with a stirrer 18, and the agitation liquid is agitated by the agitator 18, thereby aggregating solids in the undiluted liquid.

  By supplying the stock solution from the stock solution supply line 14 and the aggregate solution from the aggregate solution supply line 15, the aggregate stock solution 19 overflows from the aggregate stock solution supply port 13 and is supplied to the dehydration tank 3. The supply amount of the agglomerated stock solution 19 is adjusted so as to form a free liquid level 21 at the upstream end opening portion of the cake transport path 6.

  The agglomerated stock solution 19 supplied to the cake transport path 6 is separated into filtrates by gravity filtration at the upstream portion of the cake transport path 6, and most of the separated filtrate is between the disks 9, 9. It falls from the eyes, and the remaining part leaks into the filtrate passage 11 and is discharged from the side wall of the dehydration tank 3 through the filtrate passage 11.

  The separated flocs that have been separated land on the lower filter body group 5 and are conveyed downstream by the rotation of the upper filter body group 4 and the lower filter body group 5. In addition, the aggregated floc is squeezed by the upper and lower upper filter body groups 4 and the lower filter body group 5 in the conveying process, and the filtrate is separated into a cake. That is, a gravity dewatering part is formed in the upstream part of the cake conveyance path 6, and a pressing dewatering part is formed in the downstream part.

  Most of the filtrate separated by the pressure falls through the eyes between the discs 9 and 9, falls below the lower filter body group 5, and the remainder leaks into the filtrate passage 11, and the filtrate passage 11 And is discharged from the side wall of the dehydration tank 3.

  Further, the dehydrated cake is discharged from the discharge port 10 by the conveying action of the upper filter body group 4 and the lower filter body group 5.

  In the conventional multiple disk dewatering device described above, the disk 9 and the spacer 20 constituting the filter body 7 are separate parts, and the spacer 20 also has a notch portion, a no-cut portion, and two types. There is a problem that it is necessary, the number of parts increases, and the production cost increases.

  In the above-described conventional multiple disk dewatering device, the filtrate separating action at the upstream portion of the cake conveying path 6 is liquid separation by gravity. Further, the eyes through which the filtrate passes are only from a slight gap formed in a portion where adjacent filter bodies 7 and 7 are superposed and the notch 40 formed in the spacer 20 for each predetermined number of sheets.

  The spacer 20 occupies most of the lower filter body group 5 facing the cake conveyance path 6, and a notch 40 is formed in the spacer 20 to communicate with the filtrate passage 11. Even if the filtrate is leaked into the filtrate passage 11 through 40, the cutout portion 40 is only formed in a part of the pole, and is not sufficient for filtration. Furthermore, the eyes formed by forming the notches 40 are slit holes that are long enough to correspond to the diameter of the filtrate passage 11 penetrating the spacer 20, and the size of the eyes for filtering the filtrate is as described above. When the length of the cut portion 40 is L, L × t (spacer thickness). This is significantly larger than the gap formed in the overlapping portion of the discs 9 and 9, and has a problem that the aggregated floc easily leaks into the filtrate passage 11.

JP 2004-330060 A

JP 2005-7327 A

  In view of such circumstances, the present invention is intended to reduce the number of parts and reduce the cost by integrating a disk and spacers constituting a filter body in a multiple disk dewatering apparatus.

  According to the present invention, a filter is formed by inserting a disc on a rotatable shaft body and a plurality of spacers with spacers having a diameter smaller than that of the disc. In the multiple disk dewatering device having a filter body group configured to filter the material to be dehydrated from the gap between the overlapping portions of the disk, at least one filter body of the filter body group includes the disk body. The present invention relates to a multiple disk dewatering device including a disk with a spacer in which a plate and the spacer are integrally formed.

  Further, the present invention provides a filter body constituted by multiplely inserting a disc on a rotatable shaft body and interposing spacers having a smaller diameter than the disc so that a part of the disc is overlapped. In the multi-disc dewatering device provided with a filter body group configured to filter the object to be dehydrated from the gap between the overlapping portions of the disk, at least one filter body of the filter body group is a circular body. The present invention relates to a multiple disk dewatering device in which plates and spacer-attached disks with spacers integrally formed on both surfaces are alternately arranged.

  The present invention also relates to a multiple disk dewatering device in which the disc with spacers is integrally formed of a synthetic resin, and the disc with spacers is integrally formed with a synthetic resin at a central portion including the spacer, and a peripheral portion. This relates to a multiple disk dewatering device made of metal.

  The present invention also relates to a multiple disk dewatering device in which a disk with spacers and a metal disk are fitted for each required number of sheets, and the disk is related to a multiple disk dewatering device made of metal. is there.

  Further, in the present invention, the filter body groups are provided so as to be opposed to each other in the vertical direction, and a dewatered material conveyance path whose cross-sectional area decreases toward the downstream is formed between the filter body groups. The filter body is transported from the upstream side to the downstream side by the rotation of the filter body, dewatered by gravity in the upstream part, and dewatered by pressing in the downstream part, and the filter body including the disc with the spacer Is related to a multiple disk dewatering device provided in an upstream portion of the dewatered material transport path.

  According to the present invention, the filter body is provided with a filtrate passage penetrating in the axial direction, the spacer extends in the radial direction, opens in a circumferential surface of the spacer, and is provided with a plurality of filtration grooves communicating with the filtrate passage. This relates to a disk dewatering device.

  According to the present invention, a required number of filter plates are formed so that a part of the discs are superposed on a disc formed on a rotatable shaft body and a plurality of spacers having spacers smaller in diameter than the disc. In a multiple disk dewatering device comprising a group of filter bodies that are connected in series and filter a material to be dehydrated from a gap between the overlapping portions of the disks, at least one filter body of the filter body group includes: Since the disk and the spacer are integrally formed with the spacer-attached disk, the number of parts can be reduced and the production cost can be reduced.

  Further, according to the present invention, it is necessary that a filter body constructed by multiplely inserting a disc on a rotatable shaft and interposing a spacer having a smaller diameter than the disc so that a part of the disc is superposed. In a multi-disc dewatering device comprising a plurality of filter bodies arranged in series and configured to filter the material to be dehydrated from the gaps between the overlapping portions of the disks, at least one filter body of the filter bodies is Since the discs and the discs with spacers in which the spacers are integrally formed on both sides are alternately arranged, the number of parts can be reduced and the production cost can be reduced.

  Further, according to the present invention, the disk with spacers is integrally formed of synthetic resin, so that the weight can be reduced and the driving power is reduced. Moreover, since the center part including the spacer is integrally formed of a synthetic resin and the peripheral part is made of metal, the spacer-attached disk is reinforced in strength when the spacer-made disk is made of synthetic resin.

  Further, according to the present invention, since the disk with spacers and the metal disk are fitted for each required number of sheets, the strength is enhanced when the disk with spacers is made of synthetic resin.

  According to the present invention, the filter body groups are provided so as to be opposed to each other in the vertical direction, and a dewatered material transport path whose cross-sectional area decreases downstream is formed between the filter body groups. Is conveyed from the upstream side to the downstream side by the rotation of the filter body, dewatering is performed by gravity in the upstream portion, and dewatering is performed by pressing in the downstream portion, including the disc with the spacer Since the filter body is provided in the upstream portion of the dehydrated material conveyance path, the filter body made of synthetic resin is used as the disk with spacer, so the disk with spacer is made of synthetic resin. The problem due to insufficient strength can be solved.

  According to the invention, the filter body is provided with a filtrate passage penetrating in the axial direction, and the spacer is formed with a filtration groove extending in a radial direction and opening in a circumferential surface of the spacer and communicating with the filtrate passage. Therefore, various excellent effects such as an improvement in the filtration efficiency at the spacer portion are exhibited.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 and FIG. 2 show an example of a multiple disk dewatering apparatus in which the present invention is implemented, particularly a multiple disk dewatering apparatus in which the cake transport path 6 has a closed structure.

  First, the multiple disk dewatering device will be described.

  In FIGS. 1 and 2, the same components as those shown in FIG. 12 are denoted by the same reference numerals.

  An upper filter body group 4 and a lower filter body group 5 are provided in the dehydration tank 3 so as to face each other vertically, and a cake transport path 6 is formed between the upper filter body group 4 and the lower filter body group 5.

  The upper filter body group 4 and the lower filter body group 5 are configured such that a required number of filter bodies 7 are partially polymerized and connected in series. The structure of the filter body 7 is the same as that described in the conventional multiple disk dewatering device, and thus the description thereof is omitted.

  An upstream end filter body group 23 is provided at the upstream end of the cake transport path 6. The upstream end filter body group 23 is constituted by the filter body 7, similar to the upper filter body group 4 and the lower filter body group 5, and the filter body 7 located at the upper and lower ends of the upstream end filter body group 23. Are connected to the upper filter body group 4 and the lower filter body group 5 so as to partially overlap with the filter body 7 located at the upstream end.

  Accordingly, the cake transport path 6 is a space closed by both side walls of the dehydration tank 3, the upper filter body group 4, the lower filter body group 5, and the upstream end filter body group 23.

  The filter bodies 7 constituting the upper filter body group 4, the lower filter body group 5, and the upstream end filter body group 23 are respectively connected to a driving source (not shown), and the aggregation stock solution in the cake transport path 6, or It is rotated to give the flock a downstream force.

  The discharge port 10 opened at the downstream end of the cake transport path 6 is provided with a resistance plate 24 as discharge resistance applying means. The resistance plate 24 is rotatably supported at the upper end by the dehydration tank 3 and is suspended so as to close the discharge port 10 by its own weight. Further, a required number of weight plates 25 can be attached to and detached from the resistance plate 24, and the closing force of the discharge port 10 can be adjusted by the number of weight plates 25.

  The coagulation tank 12 having a sealed structure and the dehydration tank 3 are connected to each other by a coagulation stock solution supply pipe 26, and the coagulation stock solution supply pipe 26 opens at the upstream end of the cake conveyance path 6 on the side wall of the dehydration tank 3.

  A pressure gauge 29 is provided at an appropriate position such as the upstream end of the aggregation tank 12, the aggregation stock solution supply pipe 26, or the cake conveyance path 6 so that the pressure in the upstream portion of the cake conveyance path 6 is detected. It has become.

  The coagulation tank 12 is connected with a stock solution supply line 14 and a coagulation liquid supply line 15, and the stock solution or the coagulation liquid can be pumped to the coagulation tank 12 by a stock solution supply pump 16 and a coagulation solution supply pump 17, respectively. . The agglomeration tank 12 has a closed structure, but an accumulator (not shown) capable of absorbing pressure fluctuations in the cake conveyance path 6 may be connected to the agglomeration tank 12.

  The stock solution in the agglomeration tank 12 is agitated by the agitator 18, and the aggregating action by the agglomerated liquid is promoted.

  Next, the filter body 7 and the like will be described in detail with reference to FIGS.

  A lower part of the lower filter body group 5 of the dehydration tank 3 is a filtrate storage part 27, and a filtrate storage side chamber 28 is formed on both sides or one side of the dehydration tank 3. Is configured to store the filtrate dropped by the gravity dehydration unit and the filtrate separated by the pressure dehydration unit, and the upper filter body group 4 and the lower filter body are stored in the filtrate storage side chamber 28 as described later. The collected filtrate flows into the filtrate passage 11 formed in the group 5.

  FIG. 3 shows the filter body 7, and a plurality of discs 47 with spacers are fitted on the shaft body 30, and the filter body 7 as a whole has a rod shape.

  The spacer disc 47 is shown in FIGS. The disc 47 with spacer is formed by integrally molding the disc 9 and the spacer 20 shown in FIG. 13, and is, for example, integral molding by synthetic resin or integral molding by aluminum die casting.

  The disc 31 and the spacer 32 are integrally formed of, for example, synthetic resin as the disc 47 with a spacer, and a fitting hole 48 through which the shaft body 30 (see FIG. 3) passes in the center of the disc 31. A thick boss portion 49 is formed around the fitting hole 48. Around the boss portion 49, a passage hole 51 for forming the filtrate passage 11 is formed at a position equally divided in the circumference (position divided into eight in FIG. 4). Around the passage hole 51, wedge-shaped protrusions 52 are formed so as to protrude over the entire circumference at a required circumferential pitch. The thickness of the portion where the projection 52 is formed is the same as the thickness of the boss portion 49, and the aggregate of the projection 52 and the boss portion 49 constitute the spacer 32.

  Further, as seen in FIG. 6, a filtration groove 53 is formed between the protrusions 52 and 52, and the filtration groove 53 has a tapered shape with a narrow outer peripheral side and a wide central side.

  When the disc 31 is incorporated in the shaft body 30 and the discs 31 and 31 are superposed, the protrusion 52 comes into contact with the adjacent disc 31 and the filtration groove 53 functions as a filtration hole extending in the radial direction. To do. The formed filtration hole has an outer end opened to the peripheral surface of the spacer 32 and an inner end opened to communicate with the passage hole 51. Further, since the filtration groove 53 has a wide cross-sectional area on the center side, it can be easily removed even when agglomerated floc flows, and the filtration hole is prevented from being clogged. Further, the size of the opening that opens to the outer periphery can be set to the same size as the eye 38 (see FIG. 3) by appropriately setting the interval between the passage holes 51.

  On the outer periphery of the disc 31, protrusions 50 are provided to protrude outward at a required interval.

  The outer diameter of the spacer 32 is smaller than the outer diameter of the disk 31, and the thickness of the spacer 32 is slightly larger than the thickness of the disk 31. In FIG. 3, for the sake of easy understanding, the thickness of the spacer 32 is shown large.

  When the disc 47 with spacer is overlapped and fitted on the shaft body 30, a groove 33 is formed on the outer periphery of the filter body 7 by the disc 31 and the spacer 32, and the groove 33 is adjacent to the groove 33. When the periphery of the disc 31 of the filter body 7 is fitted, the filter body 7 and the adjacent filter body 7 are partially polymerized. An eye 38 through which the filtrate passes is formed between the tip of the disk 31 and the peripheral surface of the spacer 32. The protrusion 50 protrudes to the extent that it substantially comes into contact with the peripheral surface of the spacer 32, and scrapes the aggregated floc adhering to the portion of the disk 31 that is in contact with the eye 38.

  A required number of filtrate inlets 35 are formed in the side wall 34 adjacent to the filtrate storage side chamber 28 of the dehydration tank 3. The filtrate inlet 35 is arranged on a circumference having the same diameter as the circumference where the filtrate passage 11 is provided so as to be able to match the filtrate passage 11. The shape of the filtrate inlet 35 is substantially the same as or slightly larger than that of the filtrate passage 11. Therefore, every time the filtrate inlet 11 and the filtrate passage 11 rotate at a pitch angle in which the filtrate passage 11 is drilled, the filtrate passage 11 and the filtrate inlet 35 coincide with each other. In the illustrated example, the filtrate passage 11 and the filtrate inlet 35 coincide with each other when the filter body 7 rotates 45 °.

  A hole 39 is provided in at least one portion of the other side wall 36 of the dehydration tank 3, and a cleaning nozzle 37 is provided adjacent to the hole 39, and the jet water flow from the cleaning nozzle 37 toward the filtrate passage 11 is provided. Is to be injected.

In addition, the jet direction of the jet water flow is inclined with respect to the axis of the filtrate passage 11, and the inclination angle θ is 0, where L is the total length of the filtrate passage 11 and D is the diameter of the filtrate passage 11. <a ^{θ <α ≒ tan -1 (D} / L). The angle of inclination does not have to be strict, and it is essential that the jet water flow penetrates or passes through the filtrate passage 11 and is inclined with respect to the axis of the filtrate passage 11.

  Hereinafter, the operation of the multiple disk dewatering device described above will be described.

  The stock solution supply pump 16 and the aggregate solution supply pump 17 are driven to pump the stock solution and aggregate solution into the aggregation tank 12. The stock solution and the flocculated liquid are stirred in the flocculation tank 12 to become a flocculated stock solution in which the solid content in the stock solution is flocculated, and the flocculated stock solution to be dehydrated is passed through the flocculated stock solution supply pipe 26 and the cake transport path 6 To the upstream of

  Since the discharge port 10 is closed by the resistance plate 24, the discharge port 10 is not discharged in any state of agglomerated stock solution or cake until the cake transport path 6 rises to a predetermined pressure.

  In the cake transport path 6, the aggregated undiluted solution is separated into aggregated flocs and filtrate by the eyes 38, and the filtrate passes through the eyes 38 and falls into the filtrate storage part 27, and opens to the entire circumference of the spacer 32. It flows into the filtrate passage 11 through the filtration groove 53, and flows out into the filtrate storage side chamber 28 through the filtrate inlet 35.

  By increasing the pressure inside the cake transport path 6, the filtrate separation action in the gravity dehydration unit is promoted, and the filtrate separation processing amount increases. Therefore, the moisture content of the cake transferred to the pressing and dehydrating portion is reduced, the cake pressing action in the pressing and dehydrating portion becomes effective, and the amount of dewatering treatment from the cake increases.

  The cake dehydrated in the gravity dewatering unit is squeezed in the squeezing and dewatering unit on the upstream side of the cake conveying path 6.

  The liquid contained in the cake is filtered and separated by pressing, and a part of the filtrate separated by the pressing and dewatering part leaks out to the filtrate passage 11 through the filtration groove 53 of the spacer 32, and the filtrate passage. 11 and flows into the filtrate storage side chamber 28 through the filtrate inlet 35.

  By forming the filtration groove 53 in the spacer 32, a filtration hole is formed that opens over the entire length and the entire circumference of the filter body 7, and the filtrate is guided to the filtrate passage 11 through the filtration hole. By forming the filtration hole over the entire length and the entire circumference of the filter body 7, eyes for uniform filtration are formed in the entire lower filter body group 5, and the filtration efficiency is greatly improved.

  The filtration groove 53 may be partially provided on the circumference of the spacer 32. For example, you may provide corresponding to the range in which the said passage hole 51 is provided.

  When the cake conveying path 6 is pressurized, the filtrate may leak to the upper side of the upper filter group 4 and accumulate on the upper filter group 4 in some cases. In this case, the upper filter body group 4 is inclined so as to be inclined downward toward the filtrate storage side chamber 28, or the dehydration tank 3 itself is inclined so that the filtrate storage side chamber 28 side is downward. As the upper filter body group 4 is inclined, the filtrate collected on the upper filter body group 4 is dropped and discharged into the filtrate storage side chamber 28.

  In addition, a pressure in the discharge direction acts on the cake by pressurizing the inside of the cake transport path 6, and further, the moisture content of the cake decreases, so that the upper filter body group 4 and the lower filter body group 5 The conveying power of the cake increases. The conveyed cake pushes up the resistance plate 24 and is discharged from the discharge port 10. By adjusting the number of the weight plates 25, the closing force of the discharge port 10 by the resistance plate 24 can be adjusted, and the resistance at the time of discharging the cake can be changed, so that the moisture content of the cake can be adjusted. It becomes.

  Control of the pressure inside the cake transport path 6 is also performed by controlling the supply amounts of the stock solution supply pump 16 and the coagulated solution supply pump 17. The pressure gauge 29 detects the pressure of the cake transport path 6, and the detection result is fed back to the driving of the stock solution supply pump 16 and the coagulated liquid supply pump 17 so that the pressure of the cake transport path 6 becomes a predetermined pressure. In addition, the supply amount of the stock solution and the aggregate solution is controlled. For example, about 0.05 MPA is selected as the predetermined value of the pressure to be controlled.

  Thus, the aggregation stock solution is pumped so that the detected pressure becomes a predetermined value, and the filtration state can be adapted to the state of the aggregation stock solution, and the filtration efficiency can be maintained and improved.

  In the case where an accumulator is provided, the fluctuation in pressure is absorbed by the accumulator, so that the supply amount of the stock solution supply pump 16 and the aggregate solution supply pump 17 can be a fixed amount supply.

  By continuing the filtration and dehydration of the aggregated stock solution, the aggregated floc adheres to the disk 31 and also adheres to the inner wall of the filtrate passage 11. Aggregated flocs adhering to the disc 31 are scraped and removed by sliding between the superposed discs 31 and 31 and by sliding the projection 50 with respect to the disc 31.

  Further, the flocs flocs adhering to the inner wall of the filtrate passage 11 or the flocs clogging the filtrate passage 11 are removed by jetting a jet water flow from the washing nozzle 37 to the filtrate passage 11.

  As shown in FIGS. 8A, 8B, and 8C, the washing of the filtrate passage 11 is such that the jet direction of the jet water flow is inclined with respect to the axis of the filtrate passage 11. Therefore, when the filter body 7 rotates, the jet water flow first collides with the wall surface on the cleaning nozzle 37 side (front side) (see FIG. 8A), and then comes into contact with the rotation of the filter body 7. The position gradually moves to the back (see FIG. 8B), and finally passes through the filtrate passage 11 (see FIG. 8C). Therefore, the penetration of the filtrate passage 11 and the cleaning of the wall surface of the filtrate passage 11 can be performed simultaneously by the jet water flow.

  Further, by providing a plurality of the washing nozzles 37 and changing the jet direction of the jet water flow from each washing nozzle 37, it becomes possible to wash different portions of the wall surface of the filtrate passage 11 for each washing nozzle 37. The entire 11 wall surfaces can be cleaned. Further, a jet water flow direction from the washing nozzle 37 may be combined in parallel with the axis of the filtrate passage 11.

  When the disc 47 is integrally formed, the use of a synthetic resin can reduce the cost and weight, but there is a case where the strength is lowered due to the use of the synthetic resin disc.

  For example, in the said filter body 7 which belongs to the pressing dehydration part of a cake conveyance path, there exists a burden of the load by pressing, and intensity | strength may be requested | required compared with a gravity dehydration part. In this case, the required number of the filter bodies 7 provided in the upstream portion of the upper filter body group 4 and the lower filter body group 5, for example, three, the disk 47 integrally formed of synthetic resin is used. And the said disk 31 of a metal plate is used about a press dehydration part.

  Further, the strength of the filter body 7 using the disc 47 made of synthetic resin may be reinforced. For example, it is possible to reinforce the synthetic resin disk 47 by inserting a metal plate disk 31 for each required number. Alternatively, the outer peripheral portion of the disc 47 outside the projection 52 is made of a metal material such as stainless steel, the central portion including the projection 52 is made of synthetic resin, and the outer peripheral portion and the central portion are press-fitted or molded. Sometimes it may be reinforced by, for example, casting or integrally molding.

  Further, a hard coating material may be applied to or embedded in the outer peripheral portion of the disc 47 made of synthetic resin, or the synthetic resin may be reinforced resin containing glass fiber.

  Further, the configuration of the upper filter body group 4, the lower filter body group 5 or the filter body 7 may be changed according to the state of the material to be dehydrated. For example, when processing a soft material to be dehydrated, all the disks constituting the upper filter body group 4 and the lower filter body group 5 are set as the disk 47 made of synthetic resin. When the intermediate substance is processed, all the upstream filter body 7 is constituted by the disk 47, and the mid-stream filter body 7 is made of the disk 47 and the metal disk 31. The spacer 32 made of synthetic resin is provided at a predetermined interval, and the filter body 7 in the downstream portion is constituted by the disk 31 made of metal and the spacer 32 made of synthetic resin.

  Another embodiment for integrally molding the disc 31 and the spacer 32 is shown in FIG.

  The disc 47 is formed integrally with the disc 31 with synthetic resin or the like so as to have boss portions 49 and 49 and protrusions 52 and 52 on both sides. The filtration groove 53 is formed between the protrusions 52 and 52, and the height of the boss portion 49 and the protrusion 52 is the same as that shown in FIGS.

  When the disc 47 is fitted to the shaft 30, the disc 31 made of synthetic resin or metal (without the boss portions 49 and protrusions 52) and the disc 47 are alternately arranged. Is polymerized. In the superposed state, a groove 33 is formed between the disks 31, 31, and one end of the filtration groove 53 is opened over the entire outer circumference of the spacer 32 formed by the protrusion 52.

  The disc 31 is made of a metal such as a stainless steel plate, and the disc 47 and the disc 31 are alternately polymerized, whereby the disc 31 is reinforced to the disc 47 and the filter body 7. Increased rigidity and strength.

  As another method of manufacturing the disk 47, the disk 31 and the spacer 32 may be separate parts, and the disk 31 and the spacer 32 may be fixedly integrated by welding, caulking, or the like.

  Hereinafter, the case where a disc and a spacer are manufactured as separate parts will be described.

  10 and 11 show a spacer 54 interposed between the disks 31 and 31, and the spacer 54 forms a filtration hole. The spacer 54 is formed by pressing a ring-shaped thin plate so that the cross section has a rectangular wave shape to form a filtration hole 55 extending in the radial direction.

  The spacer 54 is fixed to the disk 31 by necessary means such as welding or caulking, and the disk 31 and the spacer 54 are integrated to form the disk 47. The filter body 7 is configured by fitting a predetermined number of the discs 47 to the shaft body 30.

  In addition, although the said embodiment demonstrated the multiple disk dehydration apparatus with which the cake conveyance path 6 was closed, it is possible to implement to the multiple disk dehydration apparatus with the cake conveyance path 6 shown in FIG. 12 open. Needless to say.

It is a schematic explanatory drawing which shows embodiment of this invention. It is an AA arrow line view of FIG. It is a fragmentary top view of the lower filter body group in embodiment of this invention. The disc used for embodiment of this invention is shown, and it is a B arrow view of FIG. It is a side view of the disc used for embodiment of this invention. It is C enlarged view of FIG. It is the D section enlarged view of FIG. (A), (B), (C) is explanatory drawing about the filtrate channel | path washing | cleaning in this invention. It is a side view of the other disc used for embodiment of this invention. It is a partial front view of the spacer part of the further another disk used for embodiment of this invention. It is a fragmentary top view of a spacer part. It is a schematic perspective view which shows the conventional multiple disc dehydrator. It is a side view of the filter body used for the conventional multiple disc dehydrator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Dehydration tank 4 Upper filter body group 5 Lower filter body group 6 Cake conveyance path 7 Filter body 8 Rotating shaft 10 Discharge port 11 Filtrate passage 13 Aggregation stock solution supply port 14 Stock solution supply line 15 Aggregate supply line 16 Stock solution supply pump 17 Aggregation solution Supply pump 23 Upstream end filter body group 24 Resistance plate 30 Shaft body 31 Disc 32 Spacer 33 Groove 37 Cleaning nozzle 38 Eye 47 Disc 49 Boss part 50 Protrusion 51 Passage hole 52 Protrusion 53 Filtration groove 54 Spacer 55 Filtration hole

Claims (8)

  A required number of filter bodies, each of which is formed by overlapping a disc on a rotatable shaft and a plurality of spacers with a smaller diameter spacer interposed between the discs, are superposed so that a part of the disc is superposed. In a multiple disk dewatering device having a filter body group configured to filter a processed material through a gap between overlapping portions of the disk, at least one filter body of the filter body group includes the disk and the spacer. Includes a disk with a spacer formed integrally with each other.   A required number of filter bodies, each of which is formed by overlapping a disc on a rotatable shaft and a plurality of spacers with a smaller diameter spacer interposed between the discs, are superposed so that a part of the disc is superposed. In a multiple disk dewatering device comprising a filter body group configured to filter a treated product through a gap between overlapping portions of the disk, at least one filter body of the filter body group includes a disk and spacers on both sides. A multi-disk dewatering device, in which the disks with spacers formed integrally with each other are alternately arranged.   The multiple disk dewatering device according to claim 1 or 2, wherein the disk with spacers is integrally formed of synthetic resin.   The multiple disk dewatering device according to claim 1 or 2, wherein the disk with spacers is integrally formed with a synthetic resin at a central part including the spacers, and a peripheral part is made of metal.   2. The multiple disk dewatering device according to claim 1, wherein a disk with spacers and a metal disk are fitted for each required number.   The multiple disk dewatering device according to claim 2, wherein the disk is made of metal.   The filter body groups are provided so as to be opposed to each other in the vertical direction, and a dewatered material transfer path whose cross-sectional area decreases in the downstream direction is formed between the filter body groups. Transported from the upstream side to the downstream side, dewatering is performed by gravity in the upstream portion, and dewatering is performed by pressing in the downstream portion, and the filter body including the disc with the spacer is subjected to the dewatering treatment. The multiple disk dewatering device according to claim 1 or 2, wherein the multiple disk dewatering device is provided in an upstream portion of the article transport path.   The filter body is provided with a filtrate passage penetrating in the axial direction, and the spacer is formed with a filtration groove extending in a radial direction and opening in a circumferential surface of the spacer and communicating with the filtrate passage. 2 multiple disk dehydrator.

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