JPH07102286B2 - Jet type sand remover - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet sand remover in a water treatment facility such as a water purification facility.

2. Description of the Related Art Conventionally, water purification facilities have been provided with a sand basin as a facility for removing suspended solids from the raw water taken. The sand basin is provided with a sand unloading device corresponding to the sand pit formed at the bottom, and the sand that flows into the sand pit is discharged outside the pond by the sand unloading device. This sand lifting device is to jet a jet water stream from a lower end opening into a sand lifting pipe arranged in the up-down direction, and to suck sand together with the jet water flow into the sand lifting pipe to lift sand. In addition, the sand basin is equipped with a scraping device that transfers the sand that has accumulated at the bottom to the sand pit.The scraping device is designed to apply pressure from multiple pressure water injection nozzles installed at the bottom of the sand basin to the sand pit. The water was jetted and the settling sand was transferred by a jet stream of pressurized water.

However, in the above-described conventional configuration, the pipeline for supplying the pressure water to the sand lifting device and the pipeline for supplying the pressure water to the pressure water jet nozzle of the scraping device are provided. It was provided separately and a pressure pump was installed in each pipeline. In addition, each pipe is equipped with an electrically operated on-off valve for controlling the supply of pressurized water to the sand lifting device, an electrically operated on-off valve for controlling the supply of pressurized water to each pressure water jet nozzle, and the like. Was there. Therefore, in addition to requiring a plurality of driving machines, electrical components for controlling each driving machine, such as a magnet contactor, a relay, a timer, and a thermal protector, are required, and the device configuration becomes complicated, and
There was a problem that the equipment cost was high.

The present invention solves the above problems, and an object of the present invention is to provide a jet type sand remover capable of reducing the component members to simplify the device configuration and reducing the facility cost.

Means for Solving the Problems In order to solve the above problems, the present invention is provided corresponding to a sand pit of a sand basin, a sand lifting device driven by a jet water flow, and a bottom portion of the sand basin following the sand pit. A plurality of pressure water injection nozzles arranged at appropriate intervals in the flow direction of the raw water, a pressure water supply pipe having one end communicating with a water source, and a pressure pump installed in the middle, and a pressure water supply pipe A multi-way valve having an inflow side communicated with the other end, and a plurality of one-way valves having one end communicated with the outflow side of the multi-way valve and the other end communicated with the sand lifting device and each pressure water jet nozzle. It is configured to include a pressure water main pipe.

Action With the above configuration, the settling sand that has flowed into the settling basin together with the raw water settles at the settling speed according to the specific gravity and accumulates at the bottom.
Then, the sand is removed by jet water flow every predetermined period or when an appropriate amount of sand is deposited on the bottom of the sand basin. First, the multi-way valve is controlled to connect the pressure water supply pipe to the pressure water main pipe connected to the pressure water jet nozzle located farthest from the sand pit, and in this state, the pressure feed pump is driven to drive the pressure water jet nozzle. Pressure water is jetted from the tank, and the settling sand is transferred to the settling pit by the jet stream of the pressure water. Then, the multi-way valve is controlled to switch the pressure water main pipe for supplying pressure water and the pressure water injection nozzle, and the pressure water is sequentially ejected from the pressure water injection nozzle located further away from the sand pit to cause the sand basin to move. The settling sand that has accumulated at the bottom is scraped into the settling pit. Finally, the multi-way valve is controlled to connect the pressure water supply pipe to the pressure water main pipe connected to the sand lifting device, and the pressure water pumped by the drive of the pressure pump is supplied to the sand lifting device to the sand setting pit. The settled sand is lifted by a jet stream. Therefore, the control target is only one motorized multi-way valve, and by switching the multi-way valve, the pressure water pumped by one pump pump is used to carry out the operation cycle of scraping sediment and lifting sand. The device configuration and control operation are simplified.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, a sand basin 1 forms a flow path through which raw water 2 flows from the upstream side to the downstream side, and a sand pit 3 is formed at the bottom on the upstream side. Further, a sand lifting device 4 is provided corresponding to the sand setting pit 3, and the sand lifting device 4 is driven by a jet water flow, and corresponds to a lower end opening inside a vertically lifting sand pipe 5. The pressure water 7 is jetted from the jet nozzles 6 arranged as described above, and the settling sand 8 is sucked into the sand lifting pipe 5 together with the jet water flow of the pressure water 7 to lift the sand. Furthermore, a sand pool 9 is formed at the bottom of the sand pit 3 downstream, and a plurality of pressure water jet nozzles 10 are provided in the sand pool 9 at appropriate intervals in the width direction of the sand basin 1. Are arranged in rows and are arranged at appropriate intervals in the flow direction of the raw water 2. In addition, each pressure water injection nozzle
10 are attached to a plurality of main pressure water pipes 11 for each row. Then, the electric multi-way valve 12 is connected to each pressure water main pipe 11.
Is provided, and each pressure water main pipe 11 is connected to a port on the outflow side of the electric multi-way valve 12. In addition, the pressure water main pipe 10 communicating with the sand lifting device 3 is also connected to the outflow side port of the electrically operated other valve 12. A pressure water supply pipe 14 communicating with the water supply tank 13 is connected to the inflow side port of the electric multi-way valve 12, and a pressure pump is provided in the middle of the pressure water supply pipe 14.
15 are installed.

The operation of the above configuration will be described below. Raw water 2
At the same time, the settling sand 8 that has flowed into the settling basin settles down at the settling speed according to the specific gravity and accumulates at the bottom. And every predetermined period,
Alternatively, when an appropriate amount of sand 8 is deposited on the bottom of the sand basin 1, the sand is removed by jet water flow. First, the electric multi-way valve 12 is controlled so that the pressure water supply pipe 14 and the pressure water main pipe 11 connected to the pressure water jet nozzle 10 located farthest from the sand pit 3 are located. . In this state, the water in the water supply tank 13 is pressure-fed as the pressure water 7 by driving the pressure feed pump 15, and the pressure water 7 is discharged from the pressure water injection nozzle 10 through the pressure water supply pipe 14, the electric multi-way valve 12, and the pressure water main pipe 11. Jetted water and settling sand 8 by jet stream of pressure water 7
Is transferred to the sand pit 3. At this time, the jet water flow in which the settling sand 8 floats is jetted from the downstream side to the upstream side, so that the outflow to the downstream side is prevented.

Then, when the settling sand 8 accumulated in front of the pressure water jet nozzle 10 currently being jetted has been transferred to the front side of the upstream pressure water jet nozzle 10, the electric multi-way valve 12 is controlled to control the pressure water 7 The pressure water main pipe 11 for supplying water and the pressure water jet nozzle 10 are switched, and the pressure water 7 is sequentially jetted from the pressure water jet nozzle 10 located on the downstream side to deposit the sand 8 deposited on the sand pool 9.
To the sand pit 3.

Then, in a state where all the sand 8 in the sand reservoir 9 has been transferred to the sand pit 3, the electric multi-way valve 12 is controlled to connect the pressure water supply pipe 14 and the pressure water main pipe 11 connected to the sand lifting device 4. And the pressure water 7 which is pressure-fed by driving the pressure-feed pump 15 is supplied to the sand lifting device 4. The pressurized water 7 supplied to the sand lifting device is jetted from the jet nozzle 6 toward the sand lifting pipe 5, and the sand settled 8 in the sand setting pit 3 is lifted by the jet water flow.

Therefore, the control target is only one electric multi-way valve 12, and by switching the electric multi-way valve 12, the pressure water pumped by the one pump 15 is used to scrape the sand and operate the sand lift. Since the cycle is performed, the device configuration and control operation are simplified.

As described above, according to the present invention, the pressure water pumped by one pump can be used for rake and sedimentation by controlling one multiway valve, It is possible to simplify the device configuration and control operation.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. 1 ... sand basin, 2 ... raw water, 3 ... sand pit, 4 ...
Sand lifting device, 7 ... Pressure water, 8 ... Sanding device, 10 ... Pressure water jet nozzle, 11 ... Pressure water main pipe, 12 ... Electric multi-way valve, 14
...... Pressure water supply pipe, 15 ...... Pressure pump.

Claims (1)

[Claims] 1. A sand pit is provided corresponding to a sand pit in a sand basin,
A sand lifting device driven by a jet water flow, a plurality of pressure water jet nozzles arranged at appropriate intervals in the flow direction of raw water at the bottom of a sand pit in a sand basin, and one end communicating with a water source. , A pressure water supply pipe in which a pressure pump is interposed, a multi-way valve in which the inflow side communicates with the other end of the pressure water supply pipe, and one end communicates with the outflow side of this multi-way valve, A jet type sand remover having an end provided with a sand lifting device and a plurality of pressure water main pipes provided in communication with each pressure water jet nozzle.