JP4212766B2 - Water ejector for scum gathering and scum gathering device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water jetting tool and a water flow type scum squeezing device for use in scum squeezing in a water basin or settling basin in a water and sewage treatment facility.
[0002]
[Prior art]
Conventionally, spray nozzles have been used for collecting scum in water tanks and sedimentation basins in water and sewage treatment facilities. If left undisturbed, it will agglomerate on the surface of the water and solidify like a hard shell, which may make it difficult to discharge. Is placed on the water flow, and the scum is scraped and discharged from the scum pit installed at the end of the water conduit. A plurality of spray nozzles are installed at intervals in the width direction of the water basin and settling basin. The spray nozzle is fan-shaped so that the scum can be squeezed over a certain width of the water basin by one spray nozzle. In order to obtain an expanded jet flow, the jet outlet is throttled and the original pressure of the water flow (pump discharge pressure) is increased.
[0003]
[Problems to be solved by the invention]
In the conventional spray nozzle, the source pressure is increased, and the jet outlet diameter is greatly reduced to a few (minimum 2 to 3) mm (increase the pressure loss) to obtain a fan-shaped expanded jet flow. Generally, the water source used for scum squeezing is sewage treated water (so-called secondary treated water and tertiary treated water), but secondary treated water and tertiary treated water are liable to generate algae, so clogging of foreign substances into the spray nozzle is likely. It was easy to occur, and frequent maintenance work of the spray nozzle was essential. However, since water canisters are often covered with concrete from the viewpoint of deodorization, maintenance of spray nozzles is not easy, and they are often left as they are for a long period of time. It has led to accumulation and solidification.
[0004]
The present invention has been made in view of the problems of the conventional spray nozzle described above, and an object thereof is to prevent clogging due to foreign matters without requiring frequent maintenance work.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a water jetting tool for use in scum squeezing in a water treatment facility, which is fixed to the pipe-shaped main body and the pipe-shaped main body and intersects the axis of the pipe-shaped main body. And a guide plate extending in such a manner that the side wall of the pipe-shaped body forms a notch opening in the extending direction of the guide plate at the joint with the guide plate. A water spout is provided.
[0006]
The operation and effect of the invention of claim 1 will be described. The water for scum scraping introduced into the pipe-shaped main body passes through the pipe-shaped main body and collides with a guide plate crossing the pipe-shaped main body. And since the notch part of the lower end of a pipe-shaped main body is opening in the extending direction of a guide plate, water is guided along a guide plate. Therefore, it is possible to obtain a water flow having an arbitrary ejection shape according to the shape of the guide plate (for example, a fan-shaped water flow using a conventional spray nozzle). And, it is made to collide with the guide plate, and a powerful water flow of arbitrary shape is obtained by selecting the energy at the time of collision and the shape of the guide plate, and since it is not due to pressure loss as in the past, there is no part to throttle the water flow Since clogging does not occur, there is an effect that scum can be collected almost without maintenance. Moreover, since there is little possibility of clogging, water with a low degree of treatment, for example, water that has not been subjected to advanced treatment such as intermediate water such as a water conduit or a sedimentation basin can be used as a water source.
[0007]
According to a second aspect of the present invention, in the first aspect of the present invention, the guide plate extends in the direction of water ejection from the opening, and its front edge extends in a direction intersecting with the direction of water ejection. A water squirting device for scum gathering is provided.
[0008]
The operation and effect of the invention of claim 2 will be described. Since the front edge of the guide plate extends in a direction intersecting with the direction of water ejection, the shape of the ejection flow in the width direction can be selected by selecting the shape of the front edge. There is an effect that can be obtained.
[0009]
According to a third aspect of the present invention, there is provided a water squirting tool for scraping scum, wherein the front end edge of the guide plate has an arc shape in the second aspect of the present invention.
[0010]
The operation and effect of the invention of claim 3 will be described. By making the front end edge of the guide plate into an arc shape, a fan-like ejection pattern similar to that of a conventional spray nozzle can be obtained, and water ejection in the width direction of the water conduit It is possible to cover the full width of the water tank while reducing the number of tools installed.
[0011]
According to a fourth aspect of the present invention, there is provided a water squirting tool for scum gathering characterized in that in the first aspect of the present invention, the guide plate has regulating plates at both side edges. The
[0012]
The operation and effect of the invention of claim 4 will be described. Since the restriction plates are provided on both sides of the guide plate, water can be guided to the entire surface of the guide plate and does not sag from the side surface. There is an effect that can achieve a realistic scum gathering.
[0013]
According to invention of Claim 5, it is an apparatus which draws up a scum by a water flow in water treatment facilities, such as a diversion basin and a sedimentation basin, Comprising: The several water ejection tool installed at intervals in the width direction, A piping system for connecting the plurality of water ejection tools to a water source for scum raking water, and each water ejection tool is fixed to the pipe-shaped body, a pipe-shaped body connected to the piping system, A guide plate extending at least in the scum scraping direction so as to cross the axis of the pipe-shaped main body, and a side wall of the pipe-shaped main body opens in the extending direction of the guide plate at a joint portion with the guide plate. There is provided a scum scraping device characterized by forming a notch.
[0014]
The action and effect of the invention of claim 5 will be explained. Water for scum scraping introduced into each water jetting tool from the piping system passes through the pipe-shaped main body and collides with a guide plate crossing the pipe-shaped main body. The water introduced into the pipe-shaped body flows out while receiving the guidance of the guide plate from the notch with the energy at the time of the collision, but the guide plate extends in the scum scraping direction. The scum can be gathered by. And the water ejection tool does not substantially have a throttle part, and there is an effect that almost maintenance-free scum squeezing can be performed as in the first aspect of the invention. In addition, a water flow of an arbitrary shape can be obtained by selecting the shape of the guide plate, and a fan-shaped water flow by a conventional spray nozzle can also be obtained. There is an effect that the scum can be gathered over the entire width of the diversion basin and the sedimentation basin by the limited number of water ejection tools.
[0015]
According to the invention described in claim 6, in the invention described in claim 5, the piping system is lifted so as to form a drop with respect to the water jetting tool immediately before the connection point with the water jetting tool. A scum raking device is provided.
[0016]
The piping system forms a head with respect to the water jetting tool immediately before the connection point with the water jetting tool, so that the required amount of water can be obtained by the head, and the scum is crushed even if the source pressure is low. can do.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the case where the present invention is implemented in a water basin to a sedimentation basin of a sewage treatment device, and 10 is a sedimentation basin. In a large facility such as a public sewage treatment facility such as a local government, Many sedimentation ponds are installed in parallel. The water conduit 12 is disposed so as to extend along one side of the settling basin 10, and is connected to each settling basin 10 by an inflow port 14. In the figure, to-be-treated water is introduced into the water conduit 12 from the center as indicated by an arrow a, and the water to be treated is divided into right and left as indicated by an arrow b and proceeds through the water conduit 12 as indicated by an arrow c from each inlet 14. It is made to flow into each sedimentation basin 10. The water conduit 12 is provided with scum pits 15 at both left and right ends thereof.
[0018]
In order to attract the scum generated on the surface of the water conduit 12, a water flow type scraper is provided. In this embodiment, in this embodiment, as shown in FIG. 2, an assembly 20 consisting of four water jetting tools 16 and pipes 18 is arranged at intervals in the longitudinal direction of the water conduit 12 as shown in FIG. Configured.
[0019]
In FIG. 1, water is ejected from each water ejection tool 16 in the scum scraping direction. The scum rafting direction is the right end side of FIG. 1 for the right half water conduit 12 and the left end side of FIG. 1 for the left half water conduit 12. Therefore, water is ejected in the right direction as indicated by arrow e ₁ from each water ejection tool 16 of the assembly 20 provided in the right half of the water conduit 12, and the scum of the surface of the water in the water conduit 12 by the ejected water force. Is gathered in the scum pit 15 on the right end side and finally sucked and removed by a scum pump (not shown). Similarly, the water jet device 16 which is provided on the left half of the water guide grooves 12 are water ejected to the left as indicated by arrow e _2, scum surfaces are scraped up in the left direction in the figure, and finally the left side It is collected in the scum pit 15 and sucked and removed by the scum pump.
[0020]
In FIG. 2, four water jetting tools 16 constituting the water jetting tool assembly 20 are installed at intervals in the width direction of the water conduit 12. The four water jetting tools 16 are screwed to the pipe 18 as described later, and the opening direction of the water jetting tools 16 is the scum scraping direction (the direction perpendicular to the paper surface in FIG. 2). The pipe 18 extends close to and parallel to the water surface L of the water conduit 12 at the installation location of the water jetting tool 16, but has a vertically upright portion 18 'immediately upstream thereof, and this upright pipe portion. 18 'is a common pipe 22 (upright pipe portions 18' of each water jetting tool assembly 20 are gathered) and a water pump (not shown) on the common pipe 22 is a water source (secondary treatment in a sewage treatment facility). Water or tertiary treated water). The upright piping portion 18 ′ has a head H of about 0.5 to 1 m, and a water force from the water jetting tool 16 for breaking the scum is obtained by this head.
[0021]
Next, the configuration of each water jetting tool 16 will be described with reference to FIGS. 3 to 5. The water jetting tool 16 is fixed to the pipe-shaped main body 24 and the lower end of the pipe-shaped main body 24 so as to cross the axis of the pipe-shaped main body. The guide plate 26 extends to one side of the pipe-shaped main body, and the regulation plate 28 is fixed upright on both side edges of the guide plate 26. A circular arc portion of about 120 degrees at the lower end of the pipe-shaped main body 24 joined to the guide plate 26 forms a notch 30 over a height of about 20 mm. The opening direction of the notch 30 is the scum scraping direction (the longitudinal direction of the water conduit 12 in FIG. 1) indicated by arrows e ₁ and e ₂ in FIG. Therefore, water can be ejected from the notch 30 in the scum scraping direction e ₁ , e ₂ . As shown in FIG. 4, the guide plate 26 has a fan shape that expands in the opening direction of the notch 30, and the front edge 26-1 has an arc shape.
[0022]
The size of the notch 30 is almost the same as the effective cross-section of the pipe-shaped main body 24 (diameter is, for example, φ19) (the cross-section of the pipe-shaped main body 24 at the most narrowed diameter) (about 80% even if it is narrowed). The notch angle and height are determined so as to have a cross-sectional area. Therefore, the water that has entered the pipe-shaped main body 24 collides with the guide plate 26 without being subjected to throttling (pressure loss), and flows out in the scum scraping directions e ₁ and e ₂ while being guided by the guide plate 26.
[0023]
As shown in FIG. 3, the pipe-shaped main body 24 has a nut portion 32 at the upper end thereof and also forms a screw portion 34. The threaded portion 34 is screwed into the boss portion 18-1 of the pipe 18. In this threaded state, each water ejection tool 16 is attached to the pipe 18 so that the notch 30 and the guide plate 26 face the scum scraping directions e ₁ and e ₂ .
[0024]
The scum squeezing operation by the water jetting tool 16 of the present invention described above will be described. Secondary or tertiary treated water in a sewage treatment facility serving as a scum squeezing water source is supplied from a common pipe 22 (FIG. 2) and upright from a pump (not shown). It is introduced into the pipe 18 of each water jetting tool assembly 20 through the pipe portion 18 ′. And it introduce | transduces into the pipe-shaped main body 24 of each water ejection tool 16 like the arrow j of FIG. Since the guide plate 26 is fixed so as to be orthogonal to the lower end of the pipe-shaped main body 24, the water flow collides with the guide plate 26. Although the water loses its directionality for a moment due to collision with the guide plate 26, the notch 30 is provided at the lower end of the pipe-shaped main body 24, so that the collision energy is directed to the notch 30 all at once and guides the guide plate 26. And flows out along the shape of the guide plate 26. That is, in the illustrated embodiment, the front end edge 26-1 of the guide plate 26 has an arc shape, so that a water flow k (see FIG. 5) expanded in a fan shape can be obtained. This water flow has a water force corresponding to the head H (FIG. 2). Therefore, the scum formed on the surface of the water conduit in the width w portion of the water flow k from the guide plate 26 is subdivided, flows toward the scum pit as indicated by the arrow m, and is formed on the liquid surface of the water conduit. The scum can be subdivided.
[0025]
Since the restricting plates 28 are provided on both side edges of the guide plate 26, water does not spill from the side surfaces, and the intended expansion range of the guide plate 26 can be obtained, and the scum is effectively scraped. It can contribute to realization of operation.
[0026]
In the embodiment of the present invention, the water flowing out from the guide plate 26 as indicated by the arrow k has a water force based on the potential energy corresponding to the head H. For this reason, it is possible to obtain sufficient energy to squeeze only the scum without substantially reducing the opening diameter of the notch 30 with respect to the effective diameter of the pipe-shaped main body 24. There is no constricted portion in the water jetting tool 16 (the cutout portion 30 is almost the same as the diameter of the pipe-shaped main body 24 (for example, φ19) and is overwhelmingly larger than a few mm (2 to 3 mm) of a conventional spray nozzle. Therefore, clogging of foreign matter hardly occurs over a long period of time, and not only the secondary treated water and tertiary treated water of the sewage treatment facility as in the past, but also the scum of the scum by guiding the water of the settling basin as it is to the water ejection tool. There is no problem even if you do.
[0027]
Further, in the present invention, since the water flow is not restricted in the cutout portion 30, there is no pressure loss and the source pressure may be low (that is, the discharge pressure of the scum suction pump connected to the common pipe 22 may be low). The pump equipment cost can be reduced, and the maintenance can be facilitated.
[0028]
In the embodiment of the present invention described above, the front end edge 26-1 has an arc shape in order to obtain a jet shape expanded in a predetermined range in the width direction of the water conduit, but the front end edge of the guide plate 26 is By appropriately selecting the shape, the desired shape of the squirt water can be obtained. For example, if a straight front end edge 26-2 is used as shown in FIG. 6, water can be ejected in a linear direction as shown.
[Brief description of the drawings]
FIG. 1 is a plan view of a connecting portion of a water conduit to a sedimentation basin, and shows an overall schematic configuration of a scum raking device using water flow in an embodiment of the present invention.
FIG. 2 is a side view of the water jetting tool assembly according to the embodiment of the present invention, and is a view seen in the direction of the arrows along the line II-II in FIG.
FIG. 3 is a partially cutaway side view of the water ejection tool, and is an arrow view taken along line III-III in FIG. 2;
4 is a cross-sectional view of the water ejection tool, and is a cross-sectional view taken along the line IV-IV in FIG.
FIG. 5 is a perspective view of a water ejection tool.
FIG. 6 is similar to FIG. 4 but shows another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Sedimentation basin 12 ... Diversion basin 14 ... Inlet 15 ... Scum pit 16 ... Water ejection tool 18 ... Piping 18 '... Upright piping part 24 ... Pipe-shaped main body 26 ... Guide plate 28 ... Restriction plate
26-1 ... guide plate front edge 30 ... notch 32 ... nut part e ₁ , e ₂ ... scum scraping direction in water conduit

Claims (6)

A water jetting tool for use in scum gathering in a water treatment facility, comprising a pipe-like main body and a guide plate fixed to the pipe-like main body and extending so as to cross the axis of the pipe-like main body. A water jetting tool for scraping scum, wherein a side wall of the pipe-shaped main body forms a notch that opens in the extending direction of the guide plate at the joint with the guide plate. In the invention according to claim 1, the guide plate extends in the direction of water ejection from the opening, and its front end edge extends in a direction intersecting with the direction of water ejection. Water spout tool. The water jetting tool for scum gathering according to claim 2, wherein the front edge of the guide plate has an arc shape. The water jetting tool for scum scraping according to claim 1, wherein the guide plate has a regulating plate at both side edges. A device for collecting scum by a water flow in a water treatment facility such as a diversion basin or a settling basin, wherein a plurality of water ejectors arranged at intervals in the width direction, and the plurality of water ejectors are used for scum rafting A pipe system connected to a water source for each of the pipes, and each water jetting tool is connected to the pipe system, and is fixed to the pipe-type body and at least crosses the axis of the pipe-type body. A guide plate extending in the scum scraping direction, and a side wall of the pipe-shaped body forms a notch opening in the extending direction of the guide plate at a joint portion with the guide plate. Scum raking device to do. 6. The scum scraping device according to claim 5, wherein the piping system is lifted so as to form a drop with respect to the water jetting tool immediately before the connection point with the water jetting tool.

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