JP3689162B2 - Sand pumping device in sewage pond - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sand pumping device in a sewage pond, in particular, a sewage pond in which a partition plate is lowered to prevent the sand from rising, and the sand is surely moved to the sand collecting pit for sand collection. It is related with the sand lifting apparatus in the.
[0002]
[Prior art]
Conventionally, in the sewage pond such as a sewerage facility or a pumping station, the sewage deposited on the bottom of the pond is provided with a sand pit 2 at the bottom of the sewage pond 1 as shown in FIG. The nozzles are jetted sequentially, and the sand is collected by the jet water pressure on the sand pit side. In this case, the pond bottom is almost horizontal. Further, as shown in FIG. 8, the bottom surface of the sewage pond 1 is arranged in a step-like manner, the jet nozzles 12 are arranged at the bottoms of the respective basins, and these nozzles are sequentially ejected from a high position to a low position. Sand is collected on the sand pit side by the jet water pressure, and this is discharged by a sand pump.
Also, a screw conveyor is laid on the bottom of the pond and sand is collected by driving this conveyor.
[0003]
[Problems to be solved by the invention]
In the conventional sand pumping device in the sewage pond, the jet nozzle type does not restrict the jet flow of jet water, so that it has no flow direction as shown in FIGS. The sand that has settled in is transferred forward and part of it rises again, part of which flows downstream, affecting the pump and the next process. In addition, the sand collection is spreading again due to the rising of sand and the sand collection efficiency is deteriorated. Although it is conceivable to stop the raw water flowing into the sewage pond to suppress the soaking of the sedimentary sand and the downstream flow, it is impossible to stop at places where there is a continuous flow like the sewage pond. There is a point.
In addition, in a mechanical sand collecting device such as a screw conveyor type, the moving part is in sewage mixed with sewage, so the wear of the moving part is severe and the life is shortened, and trouble occurs due to biting of filth, etc. There was a problem that it was easy and maintenance costs were high.
The present invention solves the problems of the sand pumping device in the conventional sewage pond, partitions the sewage layer during sediment collection and the sedimented sand layer with a lowered partition plate, and removes the sediment sand by the jet water from the nozzle. An object of the present invention is to provide a sand-carrying device in a sewage pond that prevents the soaring and improves the sand collecting and conveying efficiency and reliably collects the sand.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the sand pumping apparatus in the sewage pond according to the present invention includes a sand pit provided with a sand pump at the bottom of the sewage pond and a pump pit, and the sand pit at the bottom of the sewage pond. with arranging a plurality of jet flow generating nozzle to carry current sand grit to, when causing operation of said jet flow generating nozzle is provided with a size to cover the Ikezoko to prevent from rising sand precipitated Ikezoko When the partition plate is installed in the vicinity of the pond bottom by the lifting and lowering means and the fountain generating nozzle is not operated, the partition plate is lifted to a position above the water surface of the sewage pond by the lifting and lowering means. Features.
[0005]
The sand pumping device in the sewage pond of the present invention having the above-described configuration is the sewage only when the sand settled in the sewage pond is collected in the sand pit by using the jet water pressure of the jet generating nozzle for pumping sand. A partition plate with a size covering the bottom of the pond that had been waiting on the surface of the water is lowered with the sewage layer in the pond and the sedimented sand layer, partitioned by this partition plate, and then the sedimented sand by the jet water from the nozzle Therefore, it is possible to prevent the settling sand from rising, improve the sand collection and transport efficiency, and reliably collect the sand into the sand pit and lift the sand.
[0006]
In this case, a rectifying plate is provided on the lower surface of the partition plate for preventing the sand settling on the pond bottom from flowing in the direction of collecting sand.
[0007]
Since the sand pumping device in the sewage pond of the present invention having the above-described configuration is provided with a baffle plate on the lower surface of the partition plate, it is possible to rectify the jet water pressure ejected from the jet flow generating nozzle, thereby reducing the sedimentation. The flow of water can be adjusted in the direction of sand collection, and the amount of jet water can be controlled to efficiently collect and transport sand.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a sand raising device in a sewage pond of the present invention will be described based on the drawings.
In the figure, reference numeral 1 denotes a sewage pond having a required shape and size in a pumping station, a sewerage treatment plant, etc., and a dust remover 10 is disposed on the side of the sewage pond 1 where the raw water flows in, so that Sediment is removed in advance so that only the sewage flows into the sewage pond, and a sand collecting pit 2 and a pump pit 3 are formed on the bottom 11 of the sewage pond 1, In the pump pit 3, a pumping pump 4 is disposed in the pump pit 3, and the bottom surface of the sewage pond 1 is a horizontal surface as shown in the figure, or an inclined surface so that the sand pit 2 side is lowered. In addition, a plurality of jet stream generating nozzles (jet nozzles) 12, 12... Are arranged in a plurality of rows on the bottom of the pond so that the dirty sand that has settled at the bottom of the pond is sequentially collected into the sand pool pit 2. Set up.
[0009]
As shown in detail in FIGS. 1 and 2, the arrangement of the fountain generating nozzle 12 is such that the sewage sand settled by the jet from the nozzle is below the sand pit 2 side in the longitudinal direction of the sewage pond. Arranged in a plurality of rows at intervals to flow into the basin, and arranged at intervals that uniformly flow over the entire width of the pond in the width direction of the sewage pond. The fountain generating nozzles 12 are arranged so as to oppose each other, and the sand collecting pit 2 is collected from both directions so as to collect sand, or is arranged so that the sand flows in one direction.
[0010]
The sand pump 6 provided in the sand reservoir pit 2 of the sewage pond 1 employs a centrifugal vane submersible pump, an air-mixing jet pump, etc., to collect the sediment collected in the sand reservoir pit 2 by using this sand pump. It is discharged to the sewage pond 1 through the sand discharge pipe 7 connected to The sand pool pit 2 has a bowl shape and can be reliably discharged by a sand pump disposed at the bottom.
[0011]
A water distribution pipe 5 is connected to a pumping pump 4 provided in the pump pit 3, and sewage obtained by precipitating and removing the sand portion in the raw water is pumped from the water distribution pipe and discharged to the sewage pond 1. As shown in the figure, the inner bottom surface of the pump pit 3 may be lower than the sand pit, that is, deeper, or the same depth as the sand pit.
[0012]
In addition, a partition plate 8 is suspended and supported on the sewage pond 1 through an elevating means 9. The partition plate 8 is flat and prevents the sand that has settled on the pond bottom from rising when the jet generating nozzle is operated. The partition plate 8 is large enough to cover the pond bottom where the sand settles as shown in FIGS. However, the partition plate 8 is suspended by a rope W such as a wire, and the rope is wound up via a lifting / lowering means 9 and is provided so as to be movable up and down so that it can be placed near the pond bottom by lowering.
[0013]
As shown in detail in FIGS. 1 to 3, the elevating means 9 has a counter shaft 9K attached to a motor 9M, and supports a hoisting shaft 9S from the counter shaft 9K via bevel gears 9G and 9G. The cords 9D and 9D provided on the winding shaft 9S are supported so as to be able to wind up. As a result, the partition plate is lowered by lowering the rope and is hung at a predetermined position near the bottom of the sewage pond 1. This state is shown in FIGS. When the fountain generating nozzle is not actuated, the rope is wound up by the lifting / lowering means 9 and the partition plate is lifted from the sewage pond, preferably above the water surface of the sewage pond, to stand by.
[0014]
The embodiment shown in FIGS. 4 to 7 is provided with a rectifying plate 81 on the lower surface of the partition plate 8, and when the jet stream generating nozzle is activated, the partition plate suppresses the rising of the sand settled on the pond bottom, Arranged at predetermined intervals in the direction toward the sand pit and parallel to the width direction of the sewage pond. As a result, when the jet stream generating nozzle is operated and the sand settled on the pond bottom is sequentially flow-conveyed in the direction of the sand pit, the jet flow of the nozzle can be directed by the rectifying plate 81, and in the sand collecting direction. The flow is rectified, and the flow can be reliably conveyed even if the jet flow rate of the jet stream generating nozzle is small, and the jet water amount can be suppressed by adjusting the jet of each nozzle.
[0015]
Next, the operation of the sand raising device in the sewage pond constructed as described above will be described. When the sedimented sediment reaches a certain value or more in the sewage pond, this is automatically detected or periodically detected to drive the lifting means 9. As a result, the partition plate descends from the standby position when the rope is lowered, and stops at a predetermined position below the surface of the sewage pond. Next, the jet stream generating nozzle 3 is operated, and the sediment sand is moved by the jet water pressure sprayed from the nozzle. In this case, the nozzles are sequentially ejected from the side close to the sand pit, or all nozzles are ejected at the same time, and are stopped almost simultaneously. Although the settling sand is swept up by the fountain generating nozzle 3, the rising of the sand is prevented by the falling partition plate.
[0016]
And when the partition plate is provided with a rectifying plate, the jet water from the nozzle is rectified, so if it is sprayed for each row in the flow direction, the amount of jet water can be reduced and the sand is collected in the sand pit. Since the volume is not large at once, the sand pump can be downsized. The sand pump is driven almost simultaneously with the jet of the jet generating nozzle 12. When the sand collection of the settling sand is completed, both the jet stream generating nozzle 12 and the sand pump 6 are stopped, and the partition plate is raised and stopped at the standby position.
[0017]
Therefore, when the nozzle is jetted under the released conditions, the movement of sand is extremely fluctuating in both direction and speed. It is possible to collect sand even when there is a flow like a sewage pond. Furthermore, since fluctuations in the amount of collected sand are greatly reduced, pump clogging and loss time for sucking only water are reduced.
[0018]
【The invention's effect】
According to the sand pumping apparatus in the sewage pond of the present invention, the sand that has settled in the sewage pond for sand pumping is only on the water surface when collecting in the sand pool pit using the jet water pressure of the jet generating nozzle. The partition plate with a size covering the bottom of the pond was lowered to partition the sewage layer in the sewage pond and the sedimented sand layer, and then the sedimented sand was allowed to flow down by the jet water from the nozzle. There is an advantage that the sand collection and transport efficiency can be improved by preventing the sedimentation sand from rising above the sedimented sand layer, and the sand collection and the sand pumping can be surely performed.
[0019]
Moreover, according to the sand raising device in the sewage pond according to claim 2 of the present invention, since the flow regulating plate is provided on the lower surface of the partition plate, the jet water pressure injected from the jet flow generating nozzle can be rectified. Thus, there is an advantage that the flow of the settling sand is adjusted in the sand collecting direction, and the amount of jet water is suppressed and efficient sand collecting and transportation can be performed.
[0020]
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view showing a first embodiment of a sand raising device in a sewage pond according to the present invention.
FIG. 2 is a longitudinal side view of the same.
FIG. 3 is a plan view of the same.
FIG. 4 is a cross-sectional front view showing a second embodiment of the sand raising device in the sewage pond of the present invention.
FIG. 5 is a side view of the same longitudinal section.
FIG. 6 is a plan view of the same.
FIG. 7 is a cross-sectional front view showing a conventional jet nozzle type sand collecting device.
FIG. 8 is a longitudinal front view showing a conventional jet nozzle type sand collecting device.
FIG. 9 is an explanatory diagram of sand collection by nozzle injection using the partition plate according to the present invention.
FIG. 10 is an explanatory diagram of sand collection by nozzle injection according to a conventional example.
FIG. 11 is an explanatory diagram of sand collection by nozzle injection using a partition plate and a current plate according to the present invention.
FIG. 12 is an explanatory diagram viewed from the upper surface of sand collection by nozzle injection according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sewage pond 2 Sand collection pit 3 Pump pit 6 Lifting pump 7 Lifting pipe 8 Partition plate 81 Current plate 9 Elevating means 11 Pond bottom 12 Jet stream generating nozzle W Strip

Claims (2)

A sand pit equipped with a sand pump at the bottom of the sewage pond and a pump pit are arranged, and a plurality of jet flow generating nozzles are arranged at the bottom of the sewage pond so as to convey and collect sand into the sand pit. together, when causing operation of said jet flow generating nozzle, the soaring partition plate having a size to cover the Ikezoko to prevent the precipitated sand placed near Ikezoko by lifting means to Ikezoko, jet flow generating When the nozzle is not operated, the sand lift device in the sewage pond is characterized in that the partition plate is lifted to a position above the water surface of the sewage pond by an elevating means to stand by .   2. The sand raising device in a sewage pond according to claim 1, wherein a rectifying plate is provided on the lower surface of the partition plate to adjust the flow of the sand in the sand collecting direction.

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