JPS6011175B2 - Float device in surface water intake equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a float device in surface water intake equipment.

Conventional surface water intake equipment has an expandable intake pipe installed inside the water intake tower, a float and an intake plate are attached to the top of the pipe, the intake plate is held at a constant water depth, and a spring is formed between the float and the intake plate. It has a structure that takes surface water into the expandable water intake pipe from the mouth. In this conventional structure, the outer diameter of the float is large because one float supports the entire weight of the expandable intake pipe and intake plate, whereas the size of the intake plate is limited to the column of the water intake tower. As a result, the outer periphery of the float comes close to the outer periphery of the water intake plate, which tends to cause disturbances in flowing water near the inlet of the spout formed between the two, resulting in a drawback that water intake efficiency is reduced. An object of the present invention is to solve such problems in the prior art and to provide a float device for surface water intake equipment in which the shape of the spout is substantially improved.

The illustrated embodiment will be described below. In the water intake tower 1, the lower ends of tower pillars 2 arranged in a hexagonal shape are fixed to an underwater foundation 3, the upper ends are made to protrude above the water surface 4 at the highest water level, and the horizontal members 5a , 5b, braces, etc., a screen 6 is attached to the outer periphery of the water intake tower 1, and an expandable water intake pipe 7 is guided and supported in the center of the interior so that it can be expanded and contracted vertically.

The expandable water intake pipe 7 consists of an upper water intake pipe 7a, intermediate water intake pipes 7b, 7c, and a lower water intake pipe 7d that slide tightly against each other, and the lower water intake pipe 7d is fixed to the foundation 3 and is passed through the water conveyance pipe 8. .

The periphery of a center hole 10 provided in a horizontal water intake plate 9 and having a trumpet-shaped circumference is connected to the upper end of the upper water intake pipe 7a, and an annular lower float 11 is fixed to the lower side of the water intake plate 9. A guide roller 1 in contact with the tower column 2 is installed on the lower surface of the outer periphery of the water intake plate 9.
2 will be provided. The upper float 13 is fixed to the upper side of the water intake plate 9 via ribs etc. arranged at equal intervals on the circumference, and the upper float 13 is fixed to the upper side of the water intake plate 9.
A spout 14 is formed between the upper float 13 and the upper float 13. The total buoyancy of the upper float 13 and the lower float 11 has a value sufficient to support the total weight of the intake pipes 7a, 7b, 7c, the intake plate 9, and the materials fixed thereto, and is responsive to changes in water level. The water intake pipe 7 is expanded and contracted along the column 2, and the water intake plate 9 is always maintained at a predetermined water depth h'. As shown in FIG. 3, the upper float 13 is combined with the lower float 11 to
The outer diameter D is sufficiently smaller than the outer diameter D2, and the lower surface 1
5 has a curved surface 15a on the outer periphery, a horizontal surface 15b facing the horizontal surface 9a of the water intake plate 9, and a concave curved surface 15c facing the curved surface 9M, and the center point 15d has a curved surface 9a.
Center hole 10 so that it is approximately the same height as the lower end exit surface a-a of b.
Get excited inside.

The horizontal surfaces 9a, 15b and the curved surfaces 9b, 15c allow the spring 014 to curve smoothly from the horizontal to the vertical direction, and its cross-sectional area gradually decreases from the outer circumference toward the center. Further, the lower float 11 is configured such that the outer diameter D3 is smaller than D2, and the lower surface is located above the plane a-a. In order to adjust the water depth h, a water injection pipe 16 is provided at the center of the upper float 13, and western water is drained into this from a machine room 17 provided at the top of the water intake tower 1.

The surface water above the water intake plate 9 flows into the telescopic water intake pipe 7 through the screen 6 and the spring opening 14, and is led to the water conduit pipe 8.

In this case, since the lower float 11 is provided, the diameter of the upper float 13 becomes smaller, which results in the water intake plate 9 extending sufficiently outward from the upper float 13, so that the surface water is relatively small due to the water intake plate 9. Haruguchi 14 with a flow velocity of
, so that no turbulence occurs at the screen 6. Therefore, cold water below the water intake plate 9 is less likely to mix into the surface water, resulting in stable water intake and improved water intake efficiency. Further, by making the outer diameter D3 of the lower float 11 smaller than the outer diameter D2 of the upper float, the above-mentioned mixing prevention effect can be further enhanced. Further, since the flow passage cross-sectional area of the spout 14 gradually decreases inward, turbulent flow within the spring spout 14 can be prevented. It is fully exerted by protruding to the upper end of the water intake pipe 7a.

When the water level decreases due to water intake, the expandable water intake pipe 7 sequentially overlaps and shortens from the intermediate water intake pipes 7c and 7b into the lower water intake pipe 7d, and surface water intake is performed until the upper water intake pipe 7a completely overlaps.

Since the lower surface of the lower float 11 is located above the line aa, it does not prevent the telescopic water intake pipe 7 from being shortened. The present invention has the above configuration, and by dividing the float into upper and lower parts, the outer diameter of the upper float is made sufficiently smaller than the outer diameter of the water plate, so even when a telescopic water intake pipe is installed in a water tower. This has the effect of improving water intake efficiency, and by gradually reducing the cross-sectional area of the spout from the outer periphery to the telescopic intake pipe, turbulence inside the spout is completely prevented, which also makes water intake stable. It has a calming effect.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional elevation view of a water intake tower, FIG. 2 is a cross-sectional plan view taken along line A-A in FIG. 1, and FIG. 3 is an enlarged cross-sectional elevation view of the intake It is. DESCRIPTION OF SYMBOLS 1... Water intake tower, 7... Expandable water intake pipe, 9... Water intake plate, 10... Center hole, 11... Lower float, 13...
...Top float, 14...Spout, 15...Bottom surface. 2 illustrations, 1 illustration, 3 illustrations

Claims (1)

[Claims] 1. In a surface water intake device that supports a telescopic intake pipe guided and supported in a water intake tower so as to be vertically expandable and retractable, and maintains a water intake plate with a center hole connected to the upper end of the telescopic intake pipe at a constant water depth, the float is The upper float is divided into an upper float whose lower surface forms a spout between the upper surface of the water intake plate and a lower float attached to the lower side of the water intake plate. A float for surface water intake equipment, characterized in that the cross-sectional area of the upper float is gradually reduced from the outer periphery of the upper float toward the upper end of the expandable water intake pipe, and the spout is curved more smoothly in the vertical direction than horizontally along the upper surface of the water intake plate. Device.