Air supplementing structure for runner blades for water turbine

Abstract

The invention discloses an air supplementing structure for runner blades for a water turbine. The air supplementing structure is characterized in that a center air supplementing pipe is arranged in a center hole of a main shaft of the water turbine; the inner end of a transverse air inlet hole formed in a flange on the main shaft of the water turbine is communicated with the center air supplementing pipe; the outer end of the transverse air inlet hole is connected with a check valve arranged on the outer edge of the flange on the main shaft of the water turbine; grooves in the edges of all the runner blades are internally provided with exhaust pipes; the check valve, the transverse air inlet hole, the center air supplementing pipe and the exhaust pipes of all the runner blades are communicated in sequence; a plurality of perpendicular exhaust holes are formed in parts, located in cavitation areas of all the runner blades, of the exhaust pipes; and the perpendicular exhaust holes face the cavitation areas of the runner blades. The air supplementing structure is simple in structure and reasonable in design, air is directly supplemented to the cavitation areas of the runner blades, the air supplementing effect is good, and it is ensured that a hydroelectric generating unit operates stably.

Description

technical field [0001] The invention relates to a water turbine, in particular to a runner blade air supply structure for the water turbine. Background technique [0002] The air supply of the turbine is an important condition to ensure the stable operation of the hydroelectric unit. There are several types of air supply for the turbine, such as short pipe air supply, cross air supply, and spindle center air supply. The traditional form of water turbine air supply is generally to supply air or compressed air to the inlet section of the draft tube. Several problems have been exposed during use: short pipe air supply is to supply air or compressed air near the draft tube arm of the turbine, and the effect of air supply is not obvious during operation; cross air supply is to supply air to the center of the draft tube inlet and the cross At a quarter of the distance from the draft tube wall in the radial direction, the installation process of the cross air supply device is comp...

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Problems solved by technology

Several problems have been exposed during use: short pipe air supply is to supply air or compressed air near the draft tube arm of the turbine, and the effect of air supply is not obvious during operation; cross air supply is to supply air to the center of the draft tube inlet and the cross At a quarter of the distance from the draft tube wall in the radial direction, the installation process of the cross air supply device is complicated, it is not easy to repair and maintain, and it is sometimes easily washed away by the water flow during operation; the air supply at the center of the spindle is to supply air to the discharge cone The air is not replenished to the cavitation area of ​​the runner blades, and the air replenishment effect is not good

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