A manufacturing method for a split-lobe runner of a large-scale impact water turbine

Abstract

The invention discloses a method for manufacturing large-scale impulsive turbine runners with split petals. According to the split structure of the large-scale impact hydraulic turbine runners manufactured by split flaps, narrow-gap submerged arc welding is used to weld the combined weld seams of the runner splits in hydropower stations. Groove form Double-sided U-shaped narrow-gap groove, compared with unilateral U-shaped narrow-gap groove, the amount of filler metal in the weld is reduced by 20%, and compared with ordinary submerged arc welding, the amount of filler metal in the weld is reduced by 60%; the use of tungsten inert Gas-shielded welding and gas-shielded gas-shielded welding are used to weld the combined weld seam at the end of the water bucket on the split-lobe surface of the runner. The impact toughness value of the seam metal is greater than 100J at 0°C, which is beneficial to prolong the service life of the combined weld. The main part of the weld is welded by the metal gas shielded welding process, which is conducive to improving the welding production efficiency.

Description

technical field [0001] The invention relates to the field of impact-type water turbine generators, in particular to a manufacturing process method for a split-lobe runner of a large-scale impact-type water turbine. Background technique [0002] With the development of high-head and large-capacity impingement hydro-generator sets, the impingement runner as the core component of the impingement hydro turbine, in order to solve the problem that the raw material of the runner cannot be forged as a whole and the road transportation capacity restricts the overall transportation of the runner, a new method is proposed. A large-scale impact turbine runner made of split lobes, the runner is divided into the first single lobe of the runner and the second single lobe of the runner through the split surface, and the runner bucket located on the split surface is divided into the first bucket. An end, a second bucket end, a first bucket root, and a second bucket root. The invention provi...

AI Technical Summary

Problems solved by technology

[0002] With the development of high-head and large-capacity impact turbine generator sets, the impact runner as the core component of the impact turbine, in order to solve the problem that the raw materials of the runner cannot be forged as a whole and the road transportation capacity limits the overall transportation of the runner, a new method is proposed. A large-scale impulse turbine runner made of split petals, the runner is divided into the first single lobe of the runner and the second single lobe of the runner through the split petal surface, and the runner water bucket located on the split petal surface is divided into the first water bucket end, second bucket end, first bucket root, and second bucket root

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