Large Francis turbine generator set

Abstract

The invention discloses a large-scale mixed-flow hydroelectric generator group which comprises two generator groups, namely a first generator group and a second generator group, wherein a disk type funnel is fixedly communicated with a water inlet pipe, and the water inlet pipe is internally provided with a ball-type water-saving valve; a first upper generator is fixedly arranged on a first rotating wheel, a first lower motor chamber is arranged below the first rotating wheel, the first lower motor chamber and the first upper generator are successively coaxially provided with a first lower generator and a first jacking support nest, and tail water of the first generator group enters a first crooked spiral pipe; a second upper generator is fixedly installed on a second rotating wheel, a second lower motor chamber is arranged below the second rotating wheel, and the second lower motor chamber and the second upper generator are successively coaxially provided with a second lower generator and a second jacking support nest; and tail water of the second generator group enters a second crooked spiral pipe. The large-scale mixed-flow hydroelectric generator group provided by the invention has the advantages that a water power resource is further developed, a unit output is improved, the generated energy is increased, the productivity development is promoted, and the large-scale mixed-flow hydroelectric generator group has a high practical economical value.

Description

technical field [0001] The invention relates to a hydraulic generator set, in particular to a large mixed-flow hydraulic generator set. Background technique [0002] At present, the Francis turbine has a compact structure, high efficiency, and can adapt to a wide range of water heads. It is one of the turbine types widely used in countries all over the world. [0003] When the water flow passes through the working wheel of the turbine, it enters in the radial direction and flows out in the axial direction, so it is also called the radial axial flow turbine. [0004] The Francis turbine is also called the Francis turbine. The water flows radially into the runner from all sides, and then flows out of the runner approximately axially. The runner is composed of an upper crown, a lower ring and blades. [0005] It is suitable for the range of water head from 20 meters to 700 meters. It has simple mechanism, stable operation and high efficiency, but it is generally used in the ra...

AI Technical Summary

Problems solved by technology

When the water flow flows into the draft tube, there may be a spiral cavity vortex belt, which intensifies the vibration of the unit. Many units cannot meet the requirements of stable operation. On the side, crosses are placed in the draft tube at the beginning of entry, inflation, etc., which reduces the output of the unit, thereby reducing the power generation

In addition, the kinetic energy of the water body when it starts to flow into the water inlet pipe is quite large, which has not been utilized yet, and the utilization rate of water energy is low

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