JP4444913B2 - 3D screen for dust removal - Google Patents

Description

  The present invention relates to a dust-removing three-dimensional screen in which water permeability is ensured for a long time and the amount of inspection capture increases.

  Conventionally, as a dust removing device equipped with a dust removing screen, an endless dust removing screen is rotatably installed in the water channel, and a water passage hole is formed so that running water passes through the dust removing screen. There is a method in which the inspection that flows down is captured by a dust removal screen, while the inspection that is captured is pulled up on the water surface and removed outside the water channel (see Patent Document 1).

  Here, “inspection” means floating dust such as sewage, floating dust such as wood chips (substances that cause solids in sewage, sediments in pipes, specifically Are paper, human feces, moss, plants, hair, vinyl / plastics, metal / glass, etc.). It may be described as “shisa” or “inspection”.

As the screen for dust removal as described above, since the water permeability of the flowing water and the capture ability of the inspection are good, the wire mesh screen was the mainstream, but the fibrous inspection like the hair is easily entangled, Its removal becomes difficult. Therefore, a porous flat screen having a certain thickness in the flowing direction of running water is used in order to make it difficult to cause entanglement of fibrous inspection like hair.
Utility Model Registration No. 3098519

  However, as shown in FIG. 5, in the porous flat screen 7 as described above, since the upstream filtration surface has a flat structure (flat screen), the trapped p is thickened by the water pressure of the flowing water r. There is a problem that the water-permeable hole 7a is easily closed in a short time because it is dense and sticks flatly on the filtration surface of the planar structure, so that water permeability is hindered and the amount of inspection and capture is reduced.

  The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a dust removing three-dimensional screen in which water permeability is ensured for a long time and the amount of inspection capture is increased. To do.

  In order to solve the above-mentioned problem, the first means of the present invention is to provide a protruding water pipe projecting toward the upstream side on the filtration surface on the upstream side of the screen main body, so that the height difference between adjacent protruding water pipes is different. The present invention provides a three-dimensional screen for dust removal which is characterized by being attached.

  According to a second aspect of the present invention, the number of protruding water pipes can be two.

  According to a third aspect of the present invention, the protruding water pipe can have a height difference of about 5 mm to 10 mm.

  According to a fourth aspect of the present invention, the overall water passage area ratio of the high protruding water pipe and the low protruding water pipe may be about 1: 3.

  As described in claim 5, the protruding water pipes may have a configuration in which the inner and outer diameters are the same, and are arranged side by side without any gaps in the vertical and horizontal directions.

According to the second means of the present invention, the water passage holes are arranged side by side on the filtration surface of the screen main body, and the protruding water passage pipes protruding toward the upstream side are arranged on the filtration surface between the adjacent water passage holes. The present invention provides a dust-removing three-dimensional screen characterized by having a difference in height between a water passage hole on a filtration surface and a protruding water pipe .

  As in claim 7, the three-dimensional screen can be configured to be attached to a dust removing device installed in a water channel.

  According to the first means of the present invention, the protruding water pipes are arranged side by side on the upstream filtration surface of the screen body, and the protruding water pipes are provided with a difference in height. When water adheres, the inspection causes a bridging phenomenon, and subsequent inspections are stacked there, and the flowing water flows into a low protruding water pipe from the lateral gap of the inspection. It becomes like this. In addition, when the inspection sticks to the low protruding water pipe, the peripheral edge of the inspection rises due to a bridge phenomenon on the outer peripheral surface of the high protruding water pipe, and subsequent inspections are stacked there. The flowing water causes a bridging phenomenon and starts to flow into a low protruding water pipe from the gap between the peripheral edges of the inspection.

  In this way, by making the filtration surface upstream of the screen body into a three-dimensional structure (three-dimensional screen), the captured inspection causes a bridge phenomenon due to the protrusion of the filtration surface and the unevenness of the water pipe, and passes through the gap However, since it starts to flow into the protruding water pipe that is not blocked by the inspection, a time difference (time lag) occurs between the inspection and the protruding water pipe being blocked, and the protruding water pipe is blocked in a short time. Since it is difficult, the amount of inspection and capture is increased while water permeability is secured for a long time.

  In addition, when the flow-in amount and the inspection amount are the same, the three-dimensional screen of the present invention has a larger water flow rate than the conventional flat screen, so the screen area can be reduced compared to the flat screen. The dust removal device and the like for mounting can be made compact, and the equipment cost can be reduced.

  According to the second aspect, since the number of inspection and capture is increased with a small number of stages, the equipment cost is reduced.

  According to the third aspect, since the amount of inspection and capture is increased with a small difference in height, the facility cost is reduced.

  According to the fourth aspect, since the number of high protruding water pipes is small, the equipment cost is reduced.

  According to the fifth aspect of the present invention, since the protruding water pipes have the same inner and outer diameters, the equipment cost is reduced, and the vertical and horizontal arrangements are provided without gaps.

  According to the second means of the present invention, the protruding water pipes are arranged side by side on the filtration surface on the upstream side of the screen body, and the water flow holes on the filtration surface and the protruding water pipes have a difference in height. When the inspection sticks across the bridge, the bridge causes a bridge phenomenon, and subsequent inspections are stacked there, and the flowing water is low from the lateral gap of the inspection. It sticks out and flows into the water pipe.

  In this way, by making the filtration surface upstream of the screen body into a three-dimensional structure (three-dimensional screen), the captured inspection causes a bridge phenomenon due to the filtration surface and protrusions of the water pipe, and passes through the gap However, since it starts to flow into the protruding water pipe that is not blocked by the inspection, a time difference (time lag) occurs between the inspection hole and the protruding water pipe. Since the water passage hole and the projecting water pipe are not easily blocked in a short time, the amount of inspection and capture is increased while water permeability is secured for a long time.

  In addition, when the flow-in amount and the inspection amount are the same, the three-dimensional screen of the present invention has a larger water flow rate than the conventional flat screen, so the screen area can be reduced compared to the flat screen. The dust removal device and the like for mounting can be made compact, and the equipment cost can be reduced.

  According to the seventh aspect, the dust removal device can efficiently capture the water flow in the water channel.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  1 (a) is a front view of the dust-removing stereoscopic screen 1, FIG. 1 (b) is a sectional view of FIG. 1 (a), and the left half of FIG. 1 (b) is a type with a height difference H1 of 5 mm. Half of the figures have a height difference H2 of 10 mm.

  The flat screen main body 2 is formed in a circular shape in a front view in the present embodiment, but may be a polygonal shape such as a square shape.

  On the upstream filtration surface of the screen main body 2, the protruding water pipes 3A and 3B protruding toward the upstream side are arranged at regular intervals vertically and horizontally so that the protruding water pipes 3A and the protruding water pipes 3B are almost alternately arranged. They are arranged side by side without any gaps. In the present embodiment, the protruding water pipes 3A and 3B are arranged side by side so that the entire outer contour of the protruding water pipes 3A and 3B has a hexagonal shape. The screen body 2 and the protruding water pipes 3A and 3B are integrally formed of a synthetic resin (for example, polypropylene). Each protruding water pipe 3A, 3B is formed with a water hole 3a penetrating the screen body 2. In addition, the water flow hole 3a does not need to be circular, and may be a polygon (a square, a rectangle, a regular hexagon, etc.). The protruding water pipes 3A and 3B may be made of metal, and the downstream end may be fixed to the screen body 2 by welding or the like.

  Of the protruding water pipes 3A and 3B, the protruding water pipe 3A is higher (longer), and the protruding water pipe 3B is lower (shorter), and the adjacent protruding water pipes 3A and 3B are provided with a height difference H1 or H2. ing.

  When the outer diameter of the screen main body 2 of the experimental dust removal stereoscopic screen 1 created to obtain performance data described later is about 90 mm, for example, the protruding water pipes 3A and 3B have the same inner and outer diameters, for example, In the case of an aluminum tube having an inner diameter of 5 mm and an outer diameter of 7 mm, and the height from the upstream filtration surface of the screen body 2 is 5 mm, the protruding water pipe 3A is protruded by 15 mm. In the type in which the water pipe 3B is 10 mm and the height difference H2 is 10 mm, the protruding water pipe 3A is 20 mm, the protruding water pipe 3B is 10 mm, and the number of elevations is two. The inner and outer diameters, materials, height differences H1, H2 and the like (the following numerical values are the same) of the protruding water pipes 3A, 3B are merely examples, and are not limited to these. Further, the inner and outer diameters of the protruding water pipes 3A and 3B need not all be the same.

  In FIG. 1A, in order to clarify the arrangement of the protruding water pipes 3A and 3B, the upper ends of the high protruding water pipes 3A are painted in black, and the upper ends of the low protruding water pipes 3B are white.

  And in Fig.1 (a), it is set as the arrangement | sequence of the following protruding water pipes 3A and 3B.

Row a: 6 low protruding water pipes 3B b row: 5 low protruding water pipes 3B, 4 high protruding water pipes 3A, 9 subtotals c row: 10 low protruding water pipes 3B d row: Low 6 protruding water pipes 3B, 5 high protruding water pipes 3A, 11 subtotals e row: 12 low protruding water pipes 3B f line: 7 low protruding water pipes 3B, 6 high protruding water pipes 3A 13 rows, 13 subtotals g row: 12 low protruding water pipes 3B h row: 6 low protruding water pipes 3B, 7 high protruding water pipes 3A, 13 subtotals i row: 12 low protruding water pipes 3B Main line j: 5 low protruding water pipes 3B, 6 high protruding water pipes 3A, 11 subtotals k line: 10 low protruding water pipes 3B, l line: 4 low protruding water pipes 3B, high protruding Five water pipes 3A, Total 9 m rows: 6 low protruding water pipes 3B n rows: 1 low protruding water pipe 3B, 3 high protruding water pipes 3A, 3 subtotals If this arrangement, the protruding water pipes 3A, 3B Is a total of 137, of which 35 are high protruding water pipes 3A and 102 are low protruding water pipes 3B, and the overall water flow area ratio between the high protruding water pipes 3A and the low protruding water pipes 3B is: About 1: 3.

  In the case of the three-dimensional screen 1 for dust removal as described above, protruding water pipes 3A and 3B are arranged side by side on the upstream filtration surface of the screen body 2, and the height difference H1 or H2 is attached to the protruding water pipes 3A and 3B. Therefore, as shown in FIG. 2 (a), when the inspection p1 is attached across the high protruding water pipe 3A, the inspection p1 causes a bridging phenomenon, and subsequent inspections are stacked there. At the same time, the flowing water r causes a bridge phenomenon and flows into the low protruding water pipe 3B from the side gap s of the inspection p1.

  Further, as shown in FIG. 2 (b), when the probe p2 adheres to the low protruding water pipe 3B, the outer peripheral surface of the high protruding water pipe 3A causes the peripheral portion of the inspection p2 to rise and cause a bridge phenomenon. Subsequent checks are stacked there, and the flowing water r causes a bridging phenomenon and flows into the lower protruding water pipe 3B from the rising gap s at the peripheral edge of the check p2. Further, when the inspection p3 adheres across the high protruding water pipe 3A and the low protruding water pipe 3B, the inspection p3 causes a bridging phenomenon and subsequent inspections are stacked there. The flowing water r causes a bridge phenomenon and flows into the low protruding water pipe 3B from the side gap s of the inspection p3.

  As confirmed by the experiment, the relatively rough inspection causes a bridge phenomenon across the high protruding water pipe 3A, and the relatively fine inspection starts to gradually block from the low protruding water pipe 3B, and then the upper part of the bridge is observed. It closes and finally closes the high protruding water pipe 3A. Note that, as described above, even in the low protruding water pipe 3B, the bridge phenomenon occurs and the inspection is swollen, so that the swollen gap s is generated.

  Thus, by making the filtration surface on the upstream side of the screen body 2 into a three-dimensional structure (three-dimensional screen), the trapped inspections p1 to p3 have a bridge phenomenon due to protrusions of the filtration surfaces and unevenness of the water pipes 3A and 3B. Wake up and flow into the protruding water pipe 3B that is not blocked by the inspections p1 to p3 through the gap s, so that it is time consuming for the inspections p1 to p3 to protrude and close the water transmission pipes 3A and 3B. A difference (time lag) occurs, and the protruding water pipes 3A and 3B are not easily blocked in a short time, so that the amount of inspection and capture is increased while water permeability is secured for a long time.

  In addition, when the flow-in amount and the inspection amount are the same, the three-dimensional screen 1 of the present embodiment has a larger water flow rate than the conventional porous flat screen 7. Therefore, the dust removing device (described later) for attaching the three-dimensional screen 1 can be made compact, and the construction cost can be reduced. For example, the porous flat screen 7 requires an area of 3.5 m × 0.5 m square, but the three-dimensional screen 1 can perform the same amount of inspection process with an area of 2.5 m × 0.5 m square. is there.

  3 shows the porous flat screen 7 of FIG. 5 (indicated by line A), the three-dimensional screen 1 of this embodiment having a height difference H1 of 5 mm (indicated by line B), and this embodiment having a height difference of H2 of 10 mm. 3 is a graph of performance data obtained by using the three-dimensional screen 1 (indicated by the line C), in which the horizontal axis indicates the adhesion thickness (mm) and the vertical axis indicates the drainage time (sec).

  From this graph, it is understood that when the adhesion thickness of the inspection is the same, drainage time is taken in the order of A, B, and C, that is, A is easily hindered in water permeability and B and C are hardly hindered in water permeability. At the same time, it can also be seen that the difference in drainage time between A, B, and C decreases as the adhesion thickness of the inspection increases. In addition, since B has a different relationship between the adhesion thickness of 0 to 7.2 mm and the adhesion thickness of 7.2 mm to 21.61 mm-drainage time, a branch point occurs near the adhesion thickness of 7.2 mm, and the adhesion thickness of 7 It can be seen that up to 0.2 mm tends to be a quadratic curve, and the adhesion thickness after 7.2 mm shows a proportional tendency.

  Further, since the adhesion thickness of the inspection is the capture ability of the inspection, if A and C are compared, the ratio of the drainage time is left as it is and the capture ability of the inspection is obtained. That is, for example, when the adhesion thickness of the inspection is 5 mm, C is 3.1 times that of A, and when the adhesion thickness of the inspection is 10 mm, C is 2.4 times that of A. .

  The number of protruding water pipes 3A and 3B of the three-dimensional screen 1 of the above embodiment is two, and the number of steps is small and the amount of inspection is increased, so the equipment cost is reduced, but it is shown in FIG. 4 (a). In this way, if a higher protruding water pipe 3C is provided, the number of elevations can be made three. In addition, four or more stages are possible.

  Moreover, since the height differences H1 and H2 of the protruding water pipes 3A and 3B are about 5 mm to 10 mm, the amount of inspection and capture increases because the height difference is small, and the equipment cost is reduced.

  Furthermore, since the overall water passage area ratio between the high protruding water pipe 3A and the low protruding water pipe 3B is about 1: 3, the number of high protruding water pipes 3A is small, so that the equipment cost is reduced.

  Further, since the protruding water pipes 3A and 3B have the same inner and outer diameters, the equipment cost is reduced, and they are arranged side by side without any gaps in the vertical and horizontal directions, so that the amount of inspection capture increases.

  Furthermore, as shown in FIG.4 (b), while forming the water flow hole 2a in the filtration surface of the screen main body 2, it is low protruding toward the upstream in the filtration surface between the adjacent water flow holes 2a. If the protruding water pipes 3B are arranged side by side, the same effect as that of the three-dimensional screen 1 of FIG. 1 can be obtained, and the height of the water flow holes 2a and the protruding water pipes 3B is two, so that the high protruding water pipes 3A are provided. It can be omitted.

  As shown in FIGS. 6 to 8, the three-dimensional screen 1 can be attached to a dust removing device (neo screen) installed in a water channel, for example.

  FIG. 6 is a partially broken view of the dust removing device 10 in order to make it easy to understand, and a portion thereof is omitted. The dust removing device 10 flows through the water channel 11 and captures the three-dimensional screen 1, a driving mechanism for driving the three-dimensional screen 1, and a removal for capturing the collected three-dimensional screen by dropping it from the three-dimensional screen 1. Device 14.

  The three-dimensional screen 1 is formed in an endless belt shape so as to penetrate in the longitudinal direction of the water channel 11, and is erected at the center of the water channel 11 on the downstream side of the partition wall 12 protruding from the water channel 11. It is rotationally driven in a state where it is disposed vertically between the intermediate strut wall 13 so that the upper part is exposed on the water surface.

  More specifically, guides 20 for guiding the three-dimensional screen 1 are disposed on the partition wall 12 and the intermediate strut wall 13 respectively, while a rotating body 22 having a pair of sprockets 23 is rotatable above the guides 20. The three-dimensional screen 1 is supported across the rotating body 22 and the guide 20, and the roller chain 30 described later of the three-dimensional screen 1 meshes with the sprocket 23 of the three-dimensional screen 1. A motor 25 is disposed on the side of the rotating body 22, and a drive chain 28 extends between a pulley 26 attached to the output shaft of the motor 25 and a pulley 27 attached to the rotating shaft of the rotating body 22. It is being handed over. With this configuration, when the motor 25 is operated, the rotational driving force is transmitted to the rotating body 22, and as a result, the three-dimensional screen 1 is rotated (rotated) as the rotating body 22 rotates.

  As shown in FIG. 8, the frames 34 are arranged on both chains 30 in a state where they are arranged in a row in a circumferential direction between a pair of endless roller chains 30 (only one side is shown in the figure) parallel to each other. The three-dimensional screen 1 is assembled to the central opening of each frame 34 so as to be detachable with bolts and nuts.

  Of the frames 34 connected to the roller chain 30, the frames 34 adjacent to each other in the circumferential direction are connected to each other via, for example, a rubber connecting member (not shown). With this configuration, the frames 34 are connected endlessly with no gap while maintaining flexibility.

  The removing device 14 includes a spray device 40 disposed immediately above the rotating body 22 and a trough 42 disposed inside the stereoscopic screen 1 so as to face the spray device 40.

  The spray device 40 is configured to inject water at high pressure toward the three-dimensional screen 1 while pumping running water by a pump installed at the bottom of the water channel, for example, and is configured to drop the inspection captured by the three-dimensional screen 1. Yes. On the other hand, the trough 42 is disposed below the stereoscopic screen 1 with the spray device 40 interposed therebetween, and the trap 42 is disposed on the upstream side of the stereoscopic screen 1 while falling off the stereoscopic screen 1 due to water pressure and collecting the inspection. It is configured to guide the collection box 44.

  In the dust removing device 10 as described above, the flowing water in the water channel 11 is guided to the inside of the stereoscopic screen 1 through the opening 12a of the partition wall 12 as indicated by the white arrow in FIGS. And flow down to the downstream side through the water passage holes 3a of the protruding water pipes 3A and 3B. Therefore, when the inspection is included in the water, the flowing water is captured when passing through the peripheral surface of the three-dimensional screen 1.

  While the inspection is captured in this manner, the three-dimensional screen 1 is rotated by the operation of the motor 25. As the stereoscopic screen 1 is driven in this manner, the captured inspection is lifted from the water along with the rotation of the stereoscopic screen 1 and is carried to the upper end of the screen (position of the rotating body 22). By spraying high-pressure water, the inspection is removed from the three-dimensional screen 1 and collected in the trough 42.

  Thus, the investigation collected in the trough 42 moves along the trough 42 by its own weight, and is thereby guided to the collection box 44. And when this collection box 44 becomes full to some extent, it will be carried out of a water channel by an operator.

  As described above, if the three-dimensional screen 1 is attached to the dust removing device 10 installed in the water channel 11, the dust removing device 10 can efficiently capture the inspection of running water (agricultural water, clean water) in the water channel 11.

  The three-dimensional screen 1 is used for solid-liquid separation such as dust screens such as flexible screens, ring screens, cup screens, rotary screens, fine screens, traveling screens, self screens, drum screens, cone screens, etc. It can also be applied to screens.

  6 to 8, the three-dimensional screen 1 is attached to a dust removing device (neo screen or the like) installed in the water channel. However, the three-dimensional screen 1 according to the present embodiment is particularly a combined rainwater with a large amount of inspection. Ideal for first flash countermeasures. That is, the flowing water at the beginning of the rain contains high-concentration pollutants because the pollutants accumulated on the ground surface and in the pipeline facilities flow out at once with the start of the rain. The phenomenon of sewage containing high-concentration pollutants immediately after the start of rainwater discharge is called first flush.

It is the three-dimensional screen for dust removal which concerns on embodiment of this invention, (a) is a front view, (b) is sectional drawing of (a). (A) (b) is sectional drawing of the capture condition of inspection by the three-dimensional screen for dust removal of FIG. It is a graph which shows the relationship between drainage time and adhesion thickness. (A) (b) is principal part sectional drawing of the three-dimensional screen for dust removal of a modification. It is sectional drawing of the capture condition of inspection by the conventional porous flat screen. It is the perspective view which made the principal part of a dust remover the cross section. It is a plane sectional view of the dust removing device of FIG. It is a principal part top view of the three-dimensional screen of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust removal solid screen 2 Screen main body 2a Water flow hole 3A High protruding water pipe 3B Low protruding water pipe 3a Water flow hole 10 Dust removal device 11 Water channel H1, H2 Height difference p1-p3 Inspection gap

Claims (7)

  A three-dimensional dust removal screen characterized in that a protruding water pipe protruding toward the upstream side is provided on the upstream filtration surface of the screen body, and the adjacent protruding water pipes are provided with a height difference.   The three-dimensional screen for dust removal according to claim 1, wherein the number of the protruding water pipes is two.   The three-dimensional screen for dust removal according to claim 1 or 2, wherein a difference in height of the protruding water pipe is about 5 mm to 10 mm.   The three-dimensional screen for dust removal according to any one of claims 1 to 3, wherein a ratio of the total water flow area of the high protruding water pipe and the low protruding water pipe is about 1: 3.   The three-dimensional screen for dust removal according to any one of claims 1 to 4, wherein the protruding water pipes have the same inner and outer diameters and are arranged side by side without any gap in the vertical and horizontal directions. In addition to arranging the water passage holes on the filtration surface of the screen body and arranging the protruding water pipes protruding toward the upstream side on the filtration surface between adjacent water passage holes, the water passage holes on the filtration surface are projected A three-dimensional screen for dust removal, characterized in that the water pipe has a height difference .   The three-dimensional screen for dust removal according to any one of claims 1 to 6, wherein the three-dimensional screen is attached to a dust removing device installed in a water channel.

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