JP2013086027A - Cyclone type filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cyclone type filtering device enabling easy backwash operation for a filter, and consequently allowing repeated use of the filter.SOLUTION: In the cyclone type filtering device, the inside of a casing is vertically partitioned by a partition plate, and a liquid filtering chamber for introducing discharged water is formed on the lower side in the casing. Moreover, a backwash water storage chamber for storing treated water after filtration, and then passing it is formed on the upper side in the casing. In the partition plate, a communication port making the backwash water storage chamber and the liquid filtering chamber communicated is arranged. The filter is protruded to the liquid filtering chamber from the communication port of the partition plate. The filter has a bottom plate in a lower end of a cylindrical filter peripheral wall part. On the outer peripheral surface of the filter peripheral wall part, a slit making the inside and the outside communicated is arranged. The slit is formed into a coil shape throughout the whole length of the cylindrical shape, or a plurality of slits are formed annularly throughout the whole length of the cylindrical shape at intervals. A vertical width of the slit is formed widely toward the inside from the outside of the cylinder.

Description

  The present invention relates to a cyclonic filtration device for filtering impurities contained in a liquid.

  For example, in a facility that treats wastewater such as sewage and sewage, wastewater is treated at a high level, and the treated water is discharged into a river or the like.

  As a technique for treating such waste water, a technique using a filter in which a hollow fiber membrane is accommodated in a casing is widely known in practice (see Patent Document 1).

Japanese Patent Laid-Open No. 11-33364

  However, the filter in which the hollow fiber membrane is accommodated becomes clogged as the filtering operation is performed. In order to eliminate clogging, there is an idea of backwashing, but impurities trapped in the hollow fiber membrane cannot be removed sufficiently even by backwashing. In addition, the impurities contained in the backwash water adhere to the hollow fiber membrane by the backwashing operation, and it is common sense that the filter needs to be replaced. Most of them do not allow easy backwashing.

  The present invention was created in view of the above circumstances, and an object of the present invention is to provide a cyclonic filtration device that can easily perform backwashing work on a filter and thereby can repeatedly use the filter.

The present invention partitions a cylindrical casing up and down by a partition plate, forms a liquid filtration chamber for introducing liquid to the lower side of the casing, and stores the treated water after filtration on the upper side of the casing and then passes through The backwash water storage chamber is formed, the partition plate has a communication port that communicates the backwash water storage chamber and the liquid filtration chamber, and the filter protrudes from the communication port of the partition plate to the liquid filtration chamber. A bottom plate portion is provided at the lower end of the cylindrical filter peripheral wall portion, and the outer peripheral surface of the filter peripheral wall portion is provided with a slit communicating inside and outside, and the slit is formed in a coil shape over the entire length of the cylindrical shape, Alternatively, a cyclonic filtration device, wherein a plurality of the annular slits are formed at intervals over the entire length of the cylindrical shape, and the upper and lower widths of the slits are formed wider from the outside to the inside of the tube. is there.
It is desirable that the cyclone type filtration device prevent the liquid introduced into the liquid filtration chamber in the casing from directly going to the filter and enhance the centrifugal action as follows. That is, the cylindrical baffle plate hangs concentrically with the casing from the partition plate, and the positional relationship is such that the filter is arranged at an interval on the inner peripheral side of the baffle plate.

In addition, as described above, the present invention projects the filter into the liquid filtration chamber, and at the same time, includes a bottom plate at the lower end of the filter peripheral wall, and widens the vertical width of the filter slit from the outside to the inside of the cylinder. The filter is projected into the backwash water storage chamber, and a top plate is provided at the upper end of the filter peripheral wall, and the vertical width of the slit of the filter is increased from the outside to the inside of the cylinder. It may be formed narrowly.
In this case as well, it is desirable that the cyclone type filtration apparatus prevents the liquid introduced into the liquid filtration chamber in the casing from going directly to the filter and enhances the centrifugal action as follows. That is, the cylindrical baffle plate hangs concentrically with the casing from the partition plate.

  Only the liquid may be introduced into the liquid filtration chamber in the casing, but in order to make the filter difficult to clog, it is desirable to do the following. That is, supplying air together with liquid to the liquid filtration chamber in the casing.

  The capacity ratio between the upper case and the lower case does not matter. However, in order to remove more deposits causing clogging from the filter by backwashing, it is desirable to do the following. That is, the casing has a capacity of the upper case substantially equal to or greater than that of the lower case.

  According to the present invention, in the filtering operation, most of the impurities contained in the liquid are separated by the action of centrifugal force by the cyclone and collected at the bottom of the casing, and the remaining impurities are filtered by the filter. And, in the backwashing operation performed when the filter is clogged, when the treated water collected in the backwash water storage chamber falls by its own weight, it passes through the slit vigorously from a wide part up and down through a narrow part. Therefore, clogging of the filter is resolved naturally. The treated water collected in the backwash water storage chamber contains only impurities that cannot be removed by the filter, and even if the treated water is used for backwashing work, other impurities do not adhere to the filter. .

  In addition, when the baffle plate is suspended from the partition plate, the centrifugal force of the cyclone acts sufficiently to efficiently collect impurities contained in the liquid at the bottom, and the impurities that could not be removed are filtered with a filter. Therefore, the filter is not easily clogged and can be used for a long time.

  In addition, when air is supplied together with the liquid, the air is also included in the liquid as bubbles, which makes it difficult for impurities to adhere to the filter, and the filter can be used for a longer period of time.

  For the casing, if the volume of the upper case is almost equal to or greater than that of the lower case, the amount of backwash water collected by the filtration operation will be large, so that the deposits that cause clogging The filter is further removed by the backwashing operation, and the filtering ability of the filter is further improved.

(A) and (B) are explanatory diagrams in the plane direction showing the state of use during the filtration operation and the drainage flow during the filtration operation, showing the cyclonic filter of the first embodiment of the present invention. (A) and (B) are explanatory diagrams in the plane direction showing the flow of backwashing water during backwashing work and the state of use during backwashing work showing the cyclonic filter of the first embodiment. It is a use condition figure in the filtration operation | work which shows the cyclonic filter apparatus of 2nd Embodiment.

  FIG. 1 shows a state in which a filtering operation is performed using the cyclonic filter device 11 of the first embodiment. The cyclonic filtration device 11 of the first embodiment includes a cylindrical upper case 12, a similar cylindrical lower case 13, and a partition with a filter 14 sandwiched between the upper case 12 and the lower case 13 as main components. A packing 16 is provided on the upper surface and the lower surface of the plate 15 and the partition plate 15. Hereinafter, each component and these connection structures are explained in full detail.

  The upper case 12 includes a cylindrical upper case peripheral wall portion 21 and a top plate portion 22 that closes the upper end of the upper case peripheral wall portion 21. Connected to the upper part of the upper case peripheral wall portion 21 is a secondary side pipe 23 for discharging treated water in the cylindrical tangential direction. Further, an air intake pipe 24 is connected to the upper part of the upper case peripheral wall portion 21, and in the illustrated example, the pipe 24 is branched and connected to the secondary side pipe 23.

  The lower case 13 includes a cylindrical lower case peripheral wall portion 31, a bottom portion 32 that closes the lower end of the lower case peripheral wall portion 31, and a leg portion 33 that supports the lower case peripheral wall portion 31 with the bottom portion 32. The bottom 32 has a conical shape whose radius decreases downward, and a drain pipe 34 is connected to the center of the bottom 32. Further, a primary side pipe 35 through which drainage flows from the cylindrical tangential direction is connected to the upper outer periphery of the lower case peripheral wall portion 31. Further, a pipe 36 that supplies air together with drainage is connected to the upper outer periphery of the lower case peripheral wall portion 31. In the illustrated example, the pipe 36 is branched and connected to a primary side pipe 35. In the illustrated example, stop valves 34a, 35a, 36a, 23a, 24a are connected to the pipes 34, 35, 36 of the lower case 13 and the pipes 23, 24 of the upper case 12, respectively.

  Further, a lower flange 31 a protrudes radially outward from the upper end portion of the lower case peripheral wall portion 31, while an upper flange 21 a protrudes radially outward from the lower end portion of the upper case peripheral wall portion 21. A cylindrical casing 17 is formed by overlapping the lower flange 31a and the upper flange 21a and fastening them with bolts and nuts. Further, the partition plate 15 is sandwiched between the lower flange 31a and the upper flange 21a via the ring-shaped packing 16 on the upper and lower surfaces thereof. In the casing 17, a backwash water storage chamber 17 a is formed that stores treated water after filtration on the upper side of the partition plate 15 and allows the treated water to pass through. A liquid that introduces liquid below the partition plate 15 is formed. A drainage filtration chamber 17b serving as a filtration chamber is formed. The capacity of the backwash water storage chamber 17a is substantially the same as the capacity of the drainage filtration chamber 17b.

  The partition plate 15 has a disk shape and is formed around a communication port 15a penetrating in the vertical direction. The drainage filtration chamber 17b and the backwash water storage chamber 17a are connected by the communication port 15a. A cylindrical filter 14 is inserted inside the communication port 15a, and the communication port 15a is welded to the upper part of the filter 14 over the entire circumference. Thereby, the filter 14 is provided depending on the partition plate 15.

The filter 14 includes a cylindrical filter peripheral wall portion 41 and a bottom plate portion 42 that closes the lower end of the filter peripheral wall portion 41.
The configuration of the filter peripheral wall portion 41 is such that a plurality of support bars 43 are arranged in parallel at intervals in the circumferential direction, and a wire 44 having a triangular cross section is extended from the support bar 43 while surrounding the outside of the support bars 43. The wire 44 is wound around the support rods 43 and fixed in a coil shape with a gap in the direction. Therefore, the slit 45 communicating inside and outside along the wire 44 is formed in a coil shape over the entire length of the outer peripheral surface of the filter peripheral wall portion 41. For this reason, in the longitudinal section including the center line of the cylindrical filter peripheral wall portion 41, a gap is formed between the wires 44 adjacent to each other in the vertical direction. Further, the filter peripheral wall portion 41 has one of the apexes of the wire 44 having a triangular cross section directed toward the inner peripheral side of the cylindrical shape, and one side facing the apex facing the cylindrical outer peripheral surface. As a result, the vertical width W of the slit 45 increases from the outside toward the inside, and the longitudinal section of the slit 45 has a triangular cross section (more specifically, an isosceles trapezoid). Moreover, since the vertical width W on the outer peripheral side of the slit 45 is very narrow, the outer peripheral surface of the filter peripheral wall portion 41 is formed into a smooth cylindrical surface.
The bottom plate portion 42 is welded to the lower end of the filter peripheral wall portion 41, and the upper end of the filter peripheral wall portion 41 is an open end. Further, a cylindrical baffle plate 18 is provided to hang from the partition plate 15 at an interval on the outer peripheral side of the filter peripheral wall portion 41. The baffle plate 18, the filter peripheral wall portion 41, and the casing 17 (lower case peripheral wall portion 31) have a concentric positional relationship.

The cyclonic filter device 11 of the first embodiment described above is used as in the following (1) and (2).
(1) When performing the filtration operation, as shown in FIG. 1, the stop valves 35a, 36a, 23a connected to the pipes 35, 36, 23 on the primary side, the air supply and the secondary side are opened, and the drain The stop valves 34a and 24a connected to the air intake pipes 34 and 24 are closed. Then, a pump (not shown) is driven to cause wastewater to flow into the drainage filtration chamber 17b from the primary side pipe 35, and the compressor is driven to cause air to flow into the drainage filtration chamber 17b from the air supply pipe 36. Then, the drainage is prevented from going directly to the filter 14 by the baffle plate 18 and turns downward while turning, and during that time, large impurities contained in the drainage collide with the inner surface of the lower case 13 by the action of centrifugal force. The remaining impurities that have accumulated in the bottom 32 and could not be removed by centrifugal force rise together with the drainage and go to the inside of the baffle plate 18 and the filter 14. At this time, if air is not supplied from the air supply pipe, the remaining impurities adhere to the outer peripheral surface of the filter 14 as it is. Other impurities are filtered by the filter 14 and adhere to the outer peripheral surface of the filter 14. That is, the bubbles reduce the amount of impurities attached to the filter 14. Then, the treated water after passing through the filter 14 enters the backwash water storage chamber 17a and flows out from the secondary pipe 23. If the filter 14 is clogged during the filtering operation, the pump is stopped and the backwashing operation is performed.

(2) When performing the backwash operation, as shown in FIG. 2, the stop valves 34a and 24a connected to the drain and air intake pipes 34 and 24 are opened, contrary to the case of the filtration operation. The stop valves 35a, 36a, 23a connected to the primary side, air supply and secondary side pipes 35, 36, 23 are closed. Then, the treated water stored in the backwash water storage chamber 17a, that is, the backwash water falls by its own weight, and at this time, air enters the backwash water storage chamber 17a and reverses from the inside of the filter 14 to the outside. Wash water passes. The vertical width W of the slit 45 is formed so that the inner side is wide and the outer side is narrow, so that the backwash water passes through the slit 45 vigorously. And drained from the drain pipe 34 together with impurities and backwash water accumulated at the bottom of the drainage filtration chamber 17b. In this way, clogging is eliminated naturally.

  FIG. 3 shows a state in which a filtering operation is performed using the cyclonic filter device 11 of the second embodiment. Compared with the first embodiment, the cyclone filtration device 11 of the second embodiment is different in that the filter 14 is accommodated in the backwash water storage chamber 17a with the protruding direction of the filter 14 as the upward direction. .

  Moreover, the cyclone filtration device 11 of the second embodiment is also different in the configuration of the filter 14. More specifically, in the first embodiment, the configuration of the filter 14 is such that the upper end of the filter peripheral wall portion 41 is made an open end by closing the lower end with the bottom plate portion 42, and the vertical width W of the slit 45 extends from the outside to the inside. In the second embodiment, the upper end is closed with the top plate portion 46 to make the lower end of the filter peripheral wall portion 41 an open end, and the vertical width W of the slit 45 is increased from the inside to the outside. It will become wider. Therefore, the filter peripheral wall portion 41 is configured such that one vertex of the wire 44 having a triangular cross section faces the outer peripheral side and one side facing the vertex faces the inner peripheral side, and the inner peripheral surface of the filter peripheral wall portion 41 is smooth. A cylindrical surface is formed.

The cyclonic filtration device 11 of the second embodiment described above is also used as in the first embodiment. (1) The filtering operation differs from the first embodiment in that impurities contained in the wastewater adhere to the inner surface of the filter 14.
(2) Moreover, what is different from the first embodiment in the backwashing operation is that the deposits are peeled off from the inner surface of the filter 14 and are directed to the drainage filtration chamber 17b.

  The present invention is not limited to the above embodiment. For example, the slits 45 are not limited to those formed in a coil shape over the entire length of the cylindrical shape, but are not illustrated, but a plurality (several numbers) are formed in an annular shape and at equal intervals over the entire length of the cylindrical shape. In this case, the filter peripheral wall portion is configured by arranging a large number of wires wound in a circle at equal intervals over the entire length of the cylindrical shape.

  Further, for the primary side pipe 35 and the air intake pipe 24, check valves may be used instead of the stop valves 35a and 24a. In this case, if the installation direction of the check valve is taken into consideration, the drainage flows into the primary side pipe 35 through the check valve and the drainage flows through the check valve even when the check valve is not closed. At 24, the check valve prevents the flow from proceeding and does not flow to the outside. On the contrary, during the backwash operation, air flows into the air intake pipe 24 from the outside through the check valve, and the backwash water is discharged. In the primary side pipe 35, the check valve prevents the progress and prevents the reverse flow.

  Furthermore, in the case of the cyclonic filtration device 11 of the second embodiment, assuming that the partition plate 15 is not provided and the relationship between the filter 14 and the baffle plate is viewed from the plane direction, the baffle plate 18 has a diameter larger than that of the filter 14. The baffle plate 18 and the filter 14 may have the same diameter, and the baffle plate 18 and the filter 14 may overlap each other. Alternatively, the baffle plate 18 may have a smaller diameter than the filter 14 and the filter 14 may be disposed outside the baffle plate 18 with an interval.

  In addition, the liquid filtered with the cyclone type filtration device of the present invention is not limited to drainage but may be drinking water or the like, and the vertical width W of the slit 45 is set in accordance with the liquid to be filtered.

11 Cyclone filter 12 Upper case 13 Lower case 14 Filter 15 Partition plate 15a Communication port 16 Packing 17 Casing 17a Backwash water storage chamber 17b Drainage filtration chamber (liquid filtration chamber)
18 baffle plate 21 upper case peripheral wall portion 21a upper flange 22 top plate portion 23 secondary side pipe 23a stop valve 24 air intake pipe 24a stop valve 31 lower case peripheral wall portion 31a lower flange 32 bottom 33 leg 34 drain Piping 34a Stop valve 35 Primary pipe 35a Stop valve 36 Air supply pipe 36a Stop valve 41 Filter peripheral wall portion 42 Bottom plate portion 43 Support rod 44 Wire 45 Slit W Vertical width 46 Top plate portion

Claims (6)

Backwash water that partitions the inside of the cylindrical casing up and down with a partition plate, forms a liquid filtration chamber for introducing liquid to the lower side of the casing, and stores the filtered treated water on the upper side of the casing and then passes it through A storage chamber is formed, and the partition plate is provided with a communication port for communicating the backwash water storage chamber and the liquid filtration chamber, and the filter protrudes from the communication port of the partition plate to the liquid filtration chamber,
The filter includes a bottom plate at the lower end of the cylindrical filter peripheral wall, and a slit that communicates the inside and outside of the outer peripheral surface of the filter peripheral wall.
The slit is formed in a coil shape over the entire length of the cylindrical shape, or a plurality of slits are formed annularly and spaced over the entire length of the cylindrical shape,
A cyclone type filtering device, wherein the vertical width of the slit is formed wider from the outside to the inside of the cylinder.   The cylindrical baffle plate hangs concentrically with the casing from the partition plate, and is in a positional relationship in which the filter is arranged at an interval on the inner peripheral side of the baffle plate. The cyclonic filtration device described. Backwash water that partitions the inside of the cylindrical casing up and down with a partition plate, forms a liquid filtration chamber for introducing liquid to the lower side of the casing, and stores the filtered treated water on the upper side of the casing and then passes it through A storage chamber is formed, and the partition plate is provided with a communication port for communicating the backwash water storage chamber and the liquid filtration chamber, and the filter protrudes from the communication port of the partition plate to the backwash water storage chamber.
The filter has a top plate at the upper end of the cylindrical filter peripheral wall, and a slit that communicates the inside and the outside on the outer peripheral surface of the filter peripheral wall.
The slit is formed in a coil shape over the entire length of the cylindrical shape, or a plurality of slits are formed annularly and spaced over the entire length of the cylindrical shape,
A cyclone type filtering device, wherein the vertical width of the slit is formed narrower from the outside to the inside of the cylinder.   The cyclonic filtration device according to claim 3, wherein a cylindrical baffle plate hangs concentrically with the casing from the partition plate.   The cyclonic filtration device according to claim 1, 2, or 4, wherein air is supplied together with liquid to a liquid filtration chamber in the casing.   The cyclone filtration device according to claim 1, 2, 3, 4, or 5, wherein the casing has a capacity of the upper case substantially equal to or larger than that of the lower case.

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