JPH0746323Y2 - Nozzle structure of sediment transfer device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a nozzle structure of a sediment transfer device in a water treatment facility such as a sewage treatment facility or a water purification facility.

2. Description of the Related Art Conventionally, a sewage treatment facility or a water purification facility is provided with a sand basin as a facility for removing suspended matter such as sand from inflowing sewage or taken raw water. Then, the sand basin is provided with a device that transfers the sediment deposited at the bottom to the sand pit, and as the sediment transport device, a device that scrapes the sand by mechanical operation such as a flight conveyor, a screw conveyor, and a feeder. The settling sand was transferred by a jet stream of pressure water jetted from a nozzle installed at the bottom of the settling basin as shown in FIG. In FIG. 5, the nozzle 21 has a nozzle opening 22 formed in a plate,
The pressure water main pipe 23 is provided via a nozzle mounting pipe 24.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the sand basin using the device for transferring the sand by the conventional jet water flow described above, when the nozzle 21 is buried in the accumulated sand 25, the powder smaller than the opening size of the nozzle 21 is generated. Diameter settling sand 25 enters the inside of the nozzle 21 and deposits,
There was a problem of closing the nozzle opening 22. In addition, even if the nozzle opening 22 is not blocked, the settling sand that has entered the pressure water main pipe 23
25 was not easily discharged to the outside, and there was a problem that the settling sand 25 continued to accumulate inside the pressure water main pipe 23.

The present invention solves the above-mentioned problems, and it is possible to prevent clogging of the nozzle opening due to sedimentation and to easily discharge the sediment that has entered the main pipe of the pressure water. The purpose is to provide.

Means for Solving the Problems In order to solve the above problems, the present invention is provided in the vicinity of the bottom of a sand basin where raw water flows from an upstream side to a downstream side,
In the nozzle of the sediment transfer device that injects pressure water toward the upstream side, the lowest part of the inner surface of the pipe of the pressure water main pipe that supplies the pressure water to the nozzle and the lowest part of the inner peripheral surface of the nozzle opening are The pressure water main pipe and the nozzle are connected so as to be positioned at the same level in the horizontal direction, and a nozzle shielding plate that covers the upper portion of the nozzle opening is provided.

Action With the above-mentioned configuration, the suspended matter that has flowed into the sand basin together with the raw water sequentially settles on the bottom of the sand basin according to the sedimentation velocity based on the specific gravity and accumulates as sand.

At this time, the settling of the settling sand is prevented by the nozzle shield plate, the settled sand does not settle below the nozzle shield plate, the entry of the settled sand into the nozzle opening portion is suppressed, and the nozzle opening portion is prevented from being blocked. Further, since the settling sand that has entered the pressure water main pipe is located at the same level in the horizontal direction, the lowest part of the pipe inner surface of the pressure water main pipe and the lowest part of the inner peripheral surface of the nozzle opening are located at the same level. At the time of water injection, it is easily discharged outside together with the pressure water.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
1 to 4, the sand basin 1 forms a flow path through which the raw water 2 flows from the upstream side to the downstream side, and at the bottom of the sand basin 1, a sand pit 3 is formed at the upstream side. ,
A sand pool 4 is formed on the upstream side of the sand pit 3. A plurality of nozzles 5 are arranged in the vicinity of the bottom of the sand pool portion 4, and the nozzle 5 is a thin plate having a nozzle opening portion 6 formed therein. This nozzle opening 6
Is formed so that the flow passage cross-sectional area becomes narrower toward the outer side of the thin plate, and the inner peripheral surface of the nozzle opening portion 6 and the outer surface of the thin plate have a blade-shaped cross section forming an edge α. Further, each nozzle 5 is connected to the pressure water main pipe 8 via a nozzle mounting pipe 7,
The lowest part A of the inner surface of the pressure water main pipe 8, the lowest part B of the inner surface of the nozzle mounting pipe 7, and the nozzle opening 6
And the lowermost portion C of the inner peripheral surface of are located at the same level in the horizontal direction. Further, a pressure water pump 9 is provided in the middle of the pressure water main pipe 8. Further, the pressure main pipe 8 is provided with a nozzle shielding plate 10 located immediately above the nozzle opening portion 6 and covering the periphery of the nozzle opening portion 10.

The operation of the above configuration will be described below. Raw water 2 flowing into the sand basin 1 circulates from the upstream side to the downstream side, and the suspended matter that has flowed into the sand basin 1 together with the raw water 2 is sequentially settled in the sand accumulation part 4 according to the sedimentation velocity based on the specific gravity. It deposits as settling sand 11. At this time, the settling of the sand 11 is blocked by the nozzle shield plate 10, the settled sand does not settle below the nozzle shield plate 10, the entry of the settled sand into the nozzle openings 6 is suppressed, and the nozzle openings 6 are closed. Is prevented.

Then, sand is settled at appropriate intervals or in the sand pool 4.
When 11 is deposited in an appropriate amount, the pressure water pump 9 is driven to pressure feed the pressure water 12 to the pressure water pipe 8 and eject it from the nozzle opening 6 of the nozzle 5 through the nozzle mounting pipe 7 to the bottom of the sand basin 1. The sand settled 11 is transferred to the sand set pit 3 by the jet water flow of the pressure water 12.

At this time, the settling sand 11 that has entered the inside of the pressure water main pipe 8 is the lowest portion A of the inner surface of the pressure water main pipe 8, the lowest portion B of the inner surface of the nozzle mounting pipe 7, and the inner circumference of the nozzle opening 6. Since the lowest part C of the surface is located at the same level in the horizontal direction, it is easily discharged to the outside together with the pressure water 12 at the time of pressure water injection. Further, since the nozzle openings 6 are formed in a blade-shaped cross section, the particles of the sediment 12 are only in line contact with the nozzle openings 6 at the edge α, so that the sediment 12 can be easily discharged.

Advantageous Effects of Invention As described above, according to the present invention, the nozzle shield plate is used to deposit the sediment below the nozzle shield plate to prevent the sand from entering the nozzle aperture. Can be prevented. Furthermore, by arranging the lowest part of the inner surface of the pressure water main pipe and the lowest part of the inner peripheral surface of the nozzle opening at the same level in the horizontal direction, the settling sand that has entered the pressure water main pipe is It can be easily discharged to the outside together with the pressurized water at the time of jetting.

[Brief description of drawings]

1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a vertical sectional view showing a nozzle structure in the same embodiment, FIG. 3 is a plan view thereof, and FIG. 4 is a vertical sectional view of a nozzle. FIG. 5 is a vertical sectional view showing a conventional nozzle structure. 1 ... sand basin, 5 ... nozzle, 6 ... nozzle opening, 8
...... Pressure water main pipe, 10 ...... Nozzle shielding plate, A ...... Lowermost part of the inner surface of the pressure water main pipe, C ...... Lowermost part of the inner peripheral surface of the nozzle opening.

Claims (1)

[Scope of utility model registration request] 1. A nozzle of a sediment transfer device, which is provided in the vicinity of a bottom of a sand basin where raw water flows from upstream to downstream and injects pressure water toward the upstream side, supplies the pressure water to the nozzle. Connect the pressure water main pipe and nozzle so that the lowest part of the inner surface of the pressure water main pipe and the lowest part of the inner peripheral surface of the nozzle opening are located at the same level in the horizontal direction. A nozzle structure of a sediment transfer device, characterized in that a nozzle shield plate covering the upper part of the nozzle is provided.