SU289166A1 - SIPHON TO MAINTAIN A SPECIFIED WATER LEVEL IN THE TOP BEAT OF HYDROTECHNICAL CONSTRUCTIONS - Google Patents

Description

The invention relates to devices for maintaining a given water level in the upstream of hydraulic structures and can be used in pressure reservoirs of hydroelectric power stations, reservoirs and irrigation canals.

Siphons are known for maintaining a predetermined level of water in the headwater, including a bent pipe with a toe in its internal plane.

To accelerate the inclusion of the siphon and expanding the range of its stable operation, the siphon is made with a catchment tray located across the width of the cross section of the pipe to which the drainage tray is 0.3-0.5 wide from the width of the cross section of the siphon pipe, and the toe is located .

The top face of the catchment tray may be zigzag.

FIG. 1 shows the described siphon, a longitudinal section; in fig. 2 - the same plan view.

The siphon includes a curved pipe / toe 2 in its internal cavity. Across the width of the cross section of the pipe, there is a catchment tray 5, to which the overflow tray 4 is adjacent, 0.3-0.5 wide, of the width of the transverse section of the siphon pipe. The bottom of the overflow tray almost repeats the shape of the overflow face 5 of the siphon and ends with the toe 2. At the outlet of the overflow tray an air discharge tube 6 is located. The overflow can be performed with a flow regulator 7

and, if necessary, a charging well 8.

As the water horizon rises in the upstream of a hydraulic structure above the ridge of the siphon, water begins to flow over the ridge, collects in the catchment tray, and then flows into the overflow tray. The thickness of the stream of water flowing down the overflow tray is two to three times the thickness of the stream of water on the siphon ridge, since the width of the overflow tray is two to three times less than the width of the ridge. The siphon ensures the removal of air from its thinning part with a smaller height of a layer of water poured over the ridge, since water collected from the entire width of the ridge is concentrated by the overflow tray on the part of the toe cap. A stream with greater specific kinetic energy flows from this nose, which, when a well falls into the water, captures more air and carries it along. The inclusion of a siphon begins with a smaller rise of the water horizon in the upstream.

At very low headings (, 5 m), the proposed accelerator should be supplemented with a zigzag threshold on the crest of the siphon. it

siphon bots and kinetic energy of the flow, and therefore increase the intensity of air removal from the siphon.

Subject invention

Claims (2)

1. Siphon to maintain a given water level in the upstream of hydraulic structures, including a bent pipe with a toe in its internal cavity, characterized in that, in order to accelerate its inclusion and expanding the range of stable work, it is made with a catchment tray located across the width of the cross section of the pipe to which the drainage tray is 0.3-0.5 wide from the width of the cross section of the siphon pipe, and the toe is located at the outlet of the overflow drain. 2. Siphon according to claim 1, characterized in that the top face of the catchment tray is made zigzag. US 1