Mixed flow type water turbine with ultralow specific speed and high efficiency for cooling tower special belt water distributer

Abstract

The invention relates to a mixed flow type water turbine with ultralow specific speed and high efficiency for a cooling tower special belt water distributer and relates to a novel energy-saving hydrodynamic device used for a cooling tower. The novel energy-saving hydrodynamic device comprises a rotating wheel, a main shaft, a bearing device, a stand ring, a base ring and cover plates, wherein the lower part of the base ring is connected with a water distributor, and the stand ring is formed by welding an volute, a guide vane, the upper cover plate and the lower cover plate into a whole. The mixed flow type water turbine provided by the invention has the characteristics of novel structure, stable operation, small noise, large flow capacity, high efficiency, energy conservation and environmental friendliness; the rotating wheel and each overflowing part of the water turbine are subjected to optimum design by adopting a CFD (computational fluid dynamic) three-dimensional flow turbulence unsteady constant analogue method, the geometric parameter of the rotating wheel and guide vane of the water turbine is set as follows: the ratio of the rotating wheel inlet diameter D1 to the rotating wheel outlet diameter D2 is equal to 1.508, the ratio of the rotating wheel height B0 to the rotating wheel inlet diameter D1 is equal to 0.20, the relative height of the guide vane O is equal to 0.09D1, the rotating wheel performance indexes meet the conditions that the specific speed ns=(50-70) m.kW, the unit speed n11=(45-55) r/min, the efficiency eta m=(88.5%-90.5%); and the key problem that the rotating wheel specific speed of the existing water turbine is overhigh and can not be matched with the cooling tower fan parameters if not being regulated by the planetary reducer is solved.

Description

technical field [0001] The invention belongs to the field of new energy-saving hydrodynamic equipment for cooling towers. Specifically, it is an ultra-low specific speed, low unit speed, and high-efficiency Francis water turbine with a water distributor dedicated to cooling towers. It uses the residual energy of circulating water without using The planetary gear reducer can directly drive the fan, thus replacing the motor as the power of the fan. Background technique [0002] The fan cooling system of the traditional cooling tower is composed of motor, drive shaft, bevel gear reversing device, planetary gear reducer, fan and other components. It has complex structure, poor reliability, high power consumption and high operating noise; The maintenance cost of the device is high. Therefore, the traditional cooling method of using a motor to drive a fan is neither environmentally friendly nor energy-saving. [0003] In view of the fact that the performance and efficiency of th...

AI Technical Summary

Problems solved by technology

Moreover, due to the limited installation space, the flow channel shape, size and structure of Francis turbines for power generation need to be greatly changed

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