SU1617090A1 - Water intake and water outlet - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to hydraulic engineering, in particular to the hydraulics of the water intake-outlets of pumped storage and tidal power plants. The purpose of the invention is to increase the efficiency of hydraulic units at work by preventing the sediment from falling into them. Within the waterway 2 of the water intake and outflow, a sump chamber in the form of trench 3 and slopes 4 and 5 is made across the stream. At the bottom of the trench there are teeth - splitters 6, each of which is made with an upper facet of trapezoidal shape in the plan extending towards hydraulic units. The height of the teeth does not exceed the depth of the trench. During the operation of the structure in the receiving mode, the flow, due to expansion within the trench, loses speed and sediment is deposited. When the facility operates in the outflow mode, the flow is split by the teeth into downstream jets, which carry sediment along the slope 5 from the trench. Due to the reversible mode of operation of the structure, automatic sediment retention and their subsequent removal without significant distortion of the hydraulic flow regime are ensured in turn. 5 il.

Description

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The invention relates to hydraulic construction and can be used to delay sediment (mainly bottom) at the intake waters of water accumulating and tidal power plants.

The aim of the invention is to increase the efficiency of the hydraulic units by preventing bottom pumps from entering them.

FIG. 1 shows a water intake-water outlet of a HPSP, a section; in Fig 2, node I in Fig 1 (trench with teeth); in fig. 3 - trench with teeth, plan view; in fig. 4 — node I in FIG. 1 (trench with teeth of different size); in fig. 5 - trench with teeth of different size, plan view.

The design of the water intake outlet consists of the head section of the flow path t, water tower 2, within which the trench is made. The bottom of the trench 3 with the help of slopes 4 and 5 is matched with the waterborne surface 2. At the bottom of the trench 3 to the slope 4 located on the side of the head part of the flow path 1, there are adjacent teeth - splitters, each of which is made with the upper edge of the trapezoidal shape in plan, expanding in the direction of hydraulic units, a height not exceeding the depth of the trench and decreasing in the direction of hydraulic units.

In another embodiment, at the bottom of the trench set, a series, teeth 6 and 7 of two different sizes (Fig. 4, 5).

The trench width at the bottom is determined by calculating from the provision condition with a certain reserve of volume sufficient to delay the pumps entering the trench during the calculated time interval when the HENP is operating in the ET mode. The distance in the axis between the teeth is approximately 1.3 greater than the base of the trapezium. In order for the teeth not to play the role of energy absorbers, their height should not exceed the depth of the trench.

The principle of operation of the structure is reduced

to the next.

During the operation of the structure in the water receiving mode, the flow within the trench loses speed, as a result sediment sedimentation occurs and clarified water enters the flow path 1. The deposits of the pumps have a form of sickle-like cages, the tails of which are located between the teeth 6, When the construction works in the water outlet mode, the stream in the trench first expands and loses speed on the slope 4, and then splits the teeth 6 on the bottom - direct jets directed towards the gaps between the teeth, which provides an increased effect of the flow on sediment deposition. As a result, sediment is transported out of trench 3, the presence of slope 5 facilitates a smooth flow of water, and with it, sediment outflow from trench 3. This process can be intensified by alternating teeth 6 and 7 of different sizes. Due to the reversible operation of the construction, the structure provides automatic sediment retention during the water intake mode and having washed them out when operating in the water outlet mode, there is almost no distortion in the hydraulic flow regime compared to the construction in which the trench is absent.

F o rm ulo 1 acquisition

The water intake-outlet of the HPSP, within the waterway of which the sump chamber is made, is characterized in that, in order to increase the efficiency of hydraulic units by preventing bottom sediments from getting into them, the sump chamber is designed as a trench located across the waterworks with slopes at the bottom of which are installed

teeth - splitters adjacent to the slope of the trench, located on the side of hydraulic units, and made with the upper edge of the trapezoidal shape in the plan, expanding on the side of hydraulic units, and a height not exceeding the depth of the trench and decreasing in the direction of hydraulic units, while the height of the splitters does not exceeds the depth of the trench.

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Claims (1)

Claim A hydroelectric intake-water outlet of the PSPP, within the limits of which a sump chamber is made, characterized in that, in order to increase the efficiency of hydraulic units by preventing sediment from entering them, the sump chamber is made in the form of a trench with slopes placed across the waterhole, at the bottom of which there are teeth splitters adjacent to the slope of the trench, located on the side of the hydraulic units, and made with the upper face of the trapezoidal 'shape in plan, expanding towards the hydraulic units, and height, not exceed reducing the depth of the trench and decreasing towards the hydraulic units, while the height of the splitter teeth does not exceed the depth of the trench. Fig. B FIG. 5