JPS5827965B2 - Sediment basin machinery and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to mechanical equipment for a settling basin for removing settled sand and sieve residue in water and sewage treatment plants.

The mechanical equipment of a settling basin using a conventional screw conveyor will be explained based on FIG. 1. A settling basin 1 faces an inlet channel 2 into which raw water flows in upstream, and a water pump (not shown) downstream thereof. is connected to.

A sieve residue scraping device 3 is provided at the downstream end of the settling basin 1 to remove sieve residue in the raw water that may be a hindrance to the water pump or the like.

This dust remover 3 is configured to scrape up the sieve residue caught on a fine grid 4 with a rake 8 provided on a chino 7 that rotates between sprocket wheels 5 and 6.

In addition, the sediment that obstructs the pump and the processing equipment installed in the latter stage is removed from the sediment pit 10 formed near the upstream of the sediment settling basin 1 by means of a screw conveyor 9 for scraping up sediment installed at the bottom of the settling basin 1. Raise it.

The sand collected in the sand settling pit 10 is discharged to the outside of the sand settling basin by a sand pump 11.

Furthermore, the sieve residue that becomes an obstacle to the sand pump 11 is removed by a coarse grid 12 provided on the midstream side of the sand settling pit 10 facing the inlet channel 2.
This prevents inflow into the settling basin 1.

The conventional sand settling basin mechanical equipment mentioned above had the following drawbacks.

(1) A plurality of grids 4 and 12 are required in the settling basin 1, and the coarse grid 12 on the upstream side has the effect of increasing the inflow resistance of raw water due to the rough sieve residue.

This action induces a vortex in the raw water, which prevents the sand from settling in the settling basin 1.

As a result, the L.L. water pump installed downstream of the settling basin 1 will be impaired.

(2) There is no means to collect the settled sand near the bottom of the fine grid 4 into the sand settling pit 10.

As a result, the lower sprocket wheel 6 is buried in the sand, making the dust remover inoperable.

As a result, there was a risk that a large water level difference would occur before and after the grid 40, making it impossible to operate the water pump.

SUMMARY OF THE INVENTION An object of the present invention is to provide a grit settling basin mechanical equipment which eliminates the above-mentioned conventional drawbacks and also allows a single-stage grid to be installed in the settling basin.

The present invention is a sand settling basin mechanical equipment in which a screw conveyor is disposed so as to penetrate into the lower part of the dust remover, and a sand settling pit is provided on the downstream side of the screw conveyor with respect to the inflow direction of raw water.

Hereinafter, the present invention will be explained based on embodiment figures.

FIG. 2 is a sectional view showing one embodiment of the present invention, and FIG.
In the AA cross-sectional view of the figure, the same parts as those in FIG. 1 will be described with the same reference numerals.

In the figure, a screw conveyor 14 is installed in the grit settling basin 13 connected to the downstream side of the inflow passage 2 at a position lower than the inflow passage 2, and the drive unit 15 of the screw conveyor 14 is connected to the settling basin 13 at a lower position than the inflow passage 2.
Placed on the upstream side of 3.

In FIG. 3, the screw conveyor 14 is provided at the bottom of a sand settling basin 13 that forms a valley-like sloping bottom.

A sand settling pit 16 is provided at the downstream end of the screw conveyor 14, and a sand pump 11 is provided within the sand settling pit 16.

Above the middle part of the screw conveyor 14, a fine grid 11 is provided which extends in the vertical direction so as to straddle the screw conveyor 14 and cross the channel of the sand settling basin 13.

On the upstream side of the fine grid 17, there is a sprocket wheel 18.
, 19, a dust remover having a rake 20 is provided on the check 7 which rotates by means of , 19.

In this way, the screw conveyor 14 is arranged so that a portion thereof penetrates the lower part of the dust remover.

Further, downstream of the sand settling basin 13, a water pump (L. not shown) is provided.

Next, the operation of the present invention will be explained.

The sand settling basin 13 reduces the flow velocity of the raw water flowing in from the inlet channel 2 and settles the sand.

The V-shaped bottom of the settling tank 13 guides this settled sand to the screw conveyor 14 6. The screw conveyor 14 and the grid 17 block the inside of the settling tank 13, and the sieve residue and coarse dust are transferred to the downstream side of the grid 17. prevent it from leaking.

The screw conveyor 14 rotated by the drive unit 15 is
No matter how low the flow rate of the raw water in the sand settling basin 13 is, the sand is forcibly carried into the sand settling pit 16 along the entire length of the screw conveyor 14, and the sand carried into the pit 16 is transferred to the settling basin 13 by the sand pump 11. Discharge to the outer surface of the

On the other hand, the lower end of the fine grid 17 and the screw conveyor 14
A slight gap 21 is provided between the gratings 17 to allow the raw water to flow freely, thereby reducing the water level difference between the upstream and downstream sides of the grid 17 and stabilizing the sedimentation of the sand.

The sieve residue caught on the grid 17 is removed by the rake 20 that scrapes the grid 17, thereby protecting the sand pump 11 and the water pump.

In the present invention, a part of the screw conveyor 14 that scrapes up the sediment penetrates into the lower part of the lower sprocket wheel 19 of the dust remover, so the sediment that has settled at the lower part of the sprocket wheel 19 is removed from the L. But it will be possible to scrape together.

Therefore, the lower sprocket wheel of the dust remover will not be buried in sediment.

The present invention described above has the following effects.

(1) The purgative sprocket wheel of the dust remover with a grid will not be buried in sediment.

Therefore, the dust remover will not become inoperable.

(2) Since the sieve residue is removed by the L flow of the sand pump, there is no need for a conventional dust remover with a coarse grid.

This not only has an energy saving effect, but also has the effect of stabilizing and speeding up the settling action of the sand.

[Brief explanation of the drawing]

The first concavity is a cross section showing the conventional sand settling basin mechanical equipment (: fi figure,
Broom Figure 2 is a cross-sectional view showing one embodiment of the present invention, and Figure 3 is a cross-sectional view showing one embodiment of the present invention.
[A cross-sectional view of Zl taken along A-A]. , 13: Sand basin, 14: Screw conveyor, 16: Sand pit [・, 17: Grid.

Claims (1)

[Claims] 1. In a sand settling basin equipped with a dust remover that crosses the flow path and a screw conveyor that runs along the bottom of the basin along the flow path, a screw conveyor 14 is provided at the bottom of the sand settling basin 13 that forms a valley-like sloping bottom, and this screw conveyor 14 Lattice 17 in the intermediate agent of
This sand settling basin mechanical equipment is characterized in that a sand settling pit 16 is provided at the downstream end of a screw conveyor 14.