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Francis Turbine Components
May 25, 2017

Francis turbines, also known as Francis turbines, are a kind of counterattack turbine, invented by American engineer Francis in 1849, also known as Francis turbines, or radial axial turbines. The flow of water flows radially into the runner from the surroundings and then flows axially out of the runner. The runner consists of the crown, the lower ring and the blade. In recent years the development trend is high head, large capacity, high than the speed and high efficiency.

Francis turbine is a compact, highly efficient, able to adapt to a wide range of head, is currently widely used in the world one of the types of turbines. When the water flow through this turbine working wheel, it enters the radial, axial outflow, it is also known as radial axial flow turbine.

It is suitable for the head from 20 meters to 700 meters, the mechanism is simple, stable and efficient, but it is generally used in the middle head (50 meters to 400 meters). Stand out from tens of kilowatts to hundreds of thousands of kilowatts. At present, the maximum output of this turbine has more than 700,000 kilowatts. Is one of the most widely used turbines. China's stand-alone capacity of 700 MW units put into operation in the Three Gorges, Xiangjiaba 800 MW mixed flow unit.

Francis Turbine The main components include volute, seat ring, water guide, roof, runner, spindle, guide bearing (see turbine guide bearing), bottom ring, tail pipe, see Figure 1, the figure at the same time Indicating the flow of water. The volute is a diversion part, the shape of the snail shell, generally made of metal material, circular section. Seat ring between the volute and guide vane, by the ring, the lower ring and a number of columns, and the volute directly connected; column was wing, can not turn, also known as fixed guide vane. Water guide mechanism by the activities of guide vane, speed loop, arm, connecting rod and other components. The rotor is directly connected to the main shaft (see turbine main shaft), which is the rotating part of the turbine. The runner consists of the upper crown, the lower ring, the discharge cone and a number of fixed blades. The shape and the matching dimensions of the components are The use of different head and different. The draft pipe is the outlet of the runner to the downstream of the water turbine discharge components, generally curved elbow-shaped, small turbine commonly used straight cone-shaped tail pipe.