JPH03258310A - Jet type sand removing equipment - Google Patents

Abstract

PURPOSE:To remove the settled sand from a sand settling pool by providing plural pressurized water jet nozzles and plural pressurized water supply pipes on the bottom part following a sand settling pit, and furnishing electromotive stop valves in the way of the pressurized water supply pipes. CONSTITUTION:The sand 8 to be settled flows into the sand settling pool 1 accompanied with raw water 2 and is accumulated on the bottom part, and a timer unit 17 commands a control unit 16 in every set time to start the controlling action. The control unit 16 opens the electromotive stop valve 12 to supply the pressurized water 7 to a pressurized water jet nozzle 10. In this state, the pressurized water 7 sent from a pressurizing pump 15 is jetted from the pressurized water jet nozzle 10, and the settled sand 8 is transferred to the sand settling pit 3 by the jet water flow of the pressurized water 7. By the periodic regular operation in every set time in timer unit 16, the frequency of operation and the amount of pressurized water are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a jet type sand removal device for water treatment equipment such as water purification facilities.

BACKGROUND OF THE INVENTION Conventionally, in water purification facilities, a settling basin is provided as a facility for removing turbidity from raw water taken from the water. The sand settling pond is provided with a sand pumping device corresponding to the sand pit formed at the bottom thereof, and the sand flowing into the sand settling pit is discharged outside the pond by the sand pumping device. This sand pumping device injects a jet water stream from a lower end opening into sand pumping pipes arranged in the vertical direction, and sucks sediment into the sand pumping pipe together with the jet water stream to lift the sand. In addition, the sand settling basin is equipped with a scraping device that transfers the sand accumulated at the bottom to the sand settling pit. Water was injected and the sand was transported by a jet stream of pressurized water.

Problems to be Solved by the Invention However, in the conventional configuration described above, since the raw water is turbid, it is not possible to visually observe the amount of sediment deposited at the bottom of the settling basin, and a large amount of sediment is deposited. The sand pumping equipment and raking equipment are automatically operated on a timer at appropriate intervals based on the expected amount of sand.

In addition, in a sand settling basin with multiple waterways installed in parallel, the inflow amount of raw water and sand differs for each waterway, so the sand pumping device and the Operating a scraping device. For this reason, there is a problem that a larger amount of pressurized water is required than necessary, and the amount of sediment that can be transferred is small compared to the cumulative amount of pressurized water used.If a relatively clean water source cannot be secured, pressurized water Industrial water or tap water has to be used as a source of water, which poses the problem of rising operating costs.

In addition, with timer automatic operation, when a large amount of sediment accumulates in a short period of time, such as during heavy rain, there is a problem that the pressure water injection nozzle becomes buried in the sediment and becomes inoperable.

The present invention solves the above problems, and aims to provide a jet-type sand removal device that can timely remove sand from a settling basin without using excessively pressurized water.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a sand-lifting device that is provided corresponding to the sand pit of a sand settling basin and is driven by a jet water flow, and a sand lifting device that is provided at the bottom of the sand settling basin following the sand pit of the sand settling basin. A plurality of pressure water injection nozzles are arranged at appropriate intervals in the flow direction of raw water, and one end is provided in communication with the water source, and a pressure pump is interposed in the middle to connect the sand pumping device and each pressure water injection nozzle. A pressure water supply pipe that supplies pressure water, an electric on-off valve that is installed in the middle of the pressure water supply pipe and controls the supply of pressure water to the sand pumping device and each pressure water injection nozzle, A control device controls the opening/closing operation by sequentially supplying pressure from a pressure water injection nozzle far from the sand settling pit, and finally supplies pressure to the sand lifting device, and a control device that controls the opening/closing operation at set times. A timer device that instructs the start, an interface meter installed at the bottom of the settling basin to detect the sedimentation height, and a control device that starts the control operation when the interface meter detects the sedimentation height exceeding a set value. This configuration also includes a driving instruction device that instructs the driver.

Operation With the above-described configuration, the sand that has flowed into the sand settling basin together with the raw water settles at a settling speed corresponding to its specific gravity and is deposited on the bottom.

Then, the control device is activated based on instructions from the timer device every set time, and controls the opening and closing operations of the on-off valve. First, the control device operates the on-off valve to supply pressurized water, which is pumped by the pressure pump through the pressure water supply pipe, to the pressure water injection nozzle located farthest from the sand settling pit. In this state, pressurized water is injected from the pressure water injection nozzle, and the sand is transferred toward the sand pit by the jet stream of the pressure water. Then, the control device operates the on-off valve at regular intervals to sequentially inject pressure water from the pressure water injection nozzles located further away from the sand settling pit, dislodging the sand accumulated at the bottom of the settling basin into the sand settling pit. Scrape. Finally, the control device operates the on-off valve to supply pressurized water pumped by the pressure pump to the sand lifting device, and the sand collected in the sand settling pit is lifted by a jet water stream.

Thereafter, the control device repeats the above operations based on instructions from the timer device.

When the timer device activates the control device, if more sand than the scheduled amount is deposited and the interface meter detects the height of sediment accumulation exceeding the set value, the operation instruction device instructs the control device to start. Instructions will be given and the sand will be removed.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, a settling basin 1 forms a flow path through which raw water 2 flows from the upstream side to the downstream side, and a settling pit 3 is formed at the bottom of the upstream side. In addition, a sand lifting device 4 is provided corresponding to the sand settling pit 3, and the sand lifting device 4 is driven by a jet water flow, and has a lower end opening inside a sand lifting pipe 5 arranged in the vertical direction. Pressure water 7 is injected from a jet nozzle 6 arranged in such a manner that sediment 8 is sucked into a sand pumping pipe 5 together with the jet flow of the pressure water 7 to lift the sand. Further, a sand pool part 9 is formed at the bottom of the downstream side following the sand settling pit 3, and a plurality of pressure water injection nozzles IO are installed in the sand pool part 9 at appropriate intervals in the width direction of the channel of the sand settling basin 1. They are arranged in rows at appropriate intervals in the flow direction of the raw water 2. Further, each pressure water injection nozzle 10 is attached to a plurality of pressure water main pipes 11 in each row. Each pressure water main pipe 11 is connected to an electric on-off valve 1.
The main pressure water pipe 11 that communicates with the sand pumping device 3 also communicates with the pressure water supply pipe 13 via an electric on-off valve 12 . Further, the pressure water supply pipe 13 communicates with a drive water tank 14, and a pressure pump 15 is interposed in the middle.

The pressure pump 15 and each electric on-off valve I2 are connected to a control device IG, and the control device 16 controls starting and stopping of the pressure pump 15 and the opening and closing operations of each electric on-off valve 12. Further, a timer device 17 is connected to the control device 16, and a control operation of the control device 16 is started at each set time according to an instruction from the timer device 17. Further, the settling pit 3 is provided with an interface meter 18 for detecting the height of the sediment 8 piled up, and the interface meter 18 is connected to an operation instruction device 19. This driving instruction device 19
is connected to the control device 1G, and instructs the control device IB to start a control operation when the interface meter 18 detects a deposition height greater than a set value.

In this embodiment, a plurality of electrically operated on-off valves 12 are interposed in each pressure water main pipe 11 to constitute the water pressure circuit for the pressure water 7, but it may also be constructed using -3 electrically operated multi-way valves. It is possible.

The effects of the above configuration will be explained below.

Sediment 8 that has flowed into the settling basin 1 together with the raw water 2 settles at a sedimentation speed according to its specific gravity and is deposited on the bottom. The timer device 17 then instructs the control device 16 to start the control operation at every set time. The control device I6 first controls the pressure water injection nozzle I located farthest from the sand settling pit 3 and on the most downstream side.
In order to supply the pressure water 7 to the pressure water injection nozzle IO, an electric on-off valve 12 interposed in the pressure water pipe 11 communicating with the pressure water injection nozzle IO is opened.

In this state, the other electric on-off valves 12 are closed, and the pressure water 7 that is force-fed by the pressure pump 15 through the pressure water supply pipe 13 is injected from the pressure water injection nozzle 10 located on the most downstream side, and the pressure The sand 8 is transferred toward the sand pit 3 by the jet stream of water 7. After a certain period of time, the control device 1B closes the electric on-off valve 12 located on the most downstream side, and supplies the pressure water 7 to the pressure water injection nozzle 10 located on the more upstream side. The electric on-off valve 12 interposed in the main pressure water pipe 11 communicating with the injection nozzle 10 is opened. Then, the control device IG performs a similar control operation at regular intervals, and sequentially injects the pressure water 7 from the pressure water injection nozzle lO located further away from the sand settling pit 3 on the downstream side.
The sand 8 accumulated at the bottom of the sand pit 3 is collected.

Finally, the control device 1B opens the electric on-off valve 12 installed in the main pressure water pipe 11 communicating with the sand pumping device 4, and transfers the pressure water 7, which is pumped by the pressure pump 15, to the sand pumping device 4.
The sand 8 scraped into the sand pit 3 is lifted by a jet stream. Thereafter, the control device 1G repeats the above operations based on instructions from the timer device 17.

When the control device I6 is activated by the timer device 17, when more sediment than the scheduled amount is deposited and the interface meter 18 detects the height of the sediment 8 exceeding the set value, the operation instruction device 19 is activated. Upon receiving the detection signal from the interface meter 18, the controller 16 is instructed to start a control operation, and the sand settling 8 is removed by the above-described operation.

Therefore, by combining the periodic normal operation at each set time by the timer device 17 and the emergency operation performed by detecting the abnormal accumulation height of the sediment 8 by the interface meter 18, the pressure water injection nozzle IO Since it is prevented from being buried and becoming inoperable, it is no longer necessary to estimate the expected amount of sand 8 deposited during normal operation to ensure safety as in the past, and the number of normal operations and pressure water 7 The cumulative amount of water used is reduced. In addition, pressure pump I5
The rated capacity of the drive water tank 14 and the water storage capacity of the driving water tank 14 can be set low, and the equipment cost is reduced by reducing the equipment scale.

Effects of the Invention As described above, according to the present invention, if more sediment than the planned amount is deposited during periodic normal operation in which the control device is activated by the timer device, the interface meter will adjust the set value. Since the emergency operation is performed by detecting the sedimentation height above, it is possible to prevent the pressure water injection nozzle from being buried in the sediment and become disabled, and the expected amount of sedimentation during normal operation is set to a low value. Therefore, it is possible to reduce the number of normal operations and the cumulative amount of pressure water used.

Furthermore, equipment costs can be reduced by lowering the rated capacity and reducing the scale of the component equipment.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. 1...Sand settling pond, 2...Raw water, 3...Sand pit,
4...Sand lifting device, 7...Pressure water, 8...Sand settling, 1
0...Pressure water injection nozzle, 11...Pressure water main pipe,!
2...Electric on-off valve, 13...Pressure water supply pipe, 15
... pressure pump, is ... control device, 17 ... timer device, 18 ... interface meter, 19 ... operation instruction device.

Claims (1)

[Claims] 1. A sand pumping device installed corresponding to the sand settling pit of the sand settling basin and driven by a jet water flow, and a plurality of pressure pumps arranged at appropriate intervals in the flow direction of raw water at the bottom of the sand settling basin following the sand pit. A water injection nozzle, a pressure water supply pipe whose one end is connected to a water source, and a pressure pump is interposed in the middle to supply pressure water to the sand pumping device and each pressure water injection nozzle; An electric on-off valve is installed in the middle to control the supply of pressurized water to the sand lifting device and each pressure water injection nozzle, and the opening and closing operations of the electric on-off valve are controlled sequentially from the pressure water injection nozzle far from the sand settling pit. a control device that supplies pressure to the sand pumping device, and a timer device that instructs the control device to start control operations at set intervals. A jet characterized by comprising an interface meter that detects the height of sediment accumulation, and an operation instruction device that instructs a control device to start a control operation when the interface meter detects a sedimentation height that is equal to or higher than a set value. Type sand removal device.