Two-stage through-flow turbine with ultralow specific speed

Abstract

The invention discloses a two-stage through-flow turbine with ultralow specific speed, which consists of a first guide vane chamber, a first runner chamber, a second guide vane chamber, a second runner chamber, a draft tube and a rotating shaft, wherein the outer shells of the first guide vane chamber, the first runner chamber, the second guide vane chamber, the second runner chamber and the draft tube are integrally connected through bolts; the outer shells of the first guide vane chamber and the second guide vane chamber are welded with one end of a guide vane together, the other end of the guide vane is welded with a flow guide cone together; a bearing is arranged in the flow guide cone to provide the support for the rotating shaft; and the blades of the first runner chamber and the second runner chamber are welded on a hub to form runners with rotating shaft which is connected through keys and form the runner chambers with the outer shells. Pressured water flows through the guide vane in a flow channel of a guide vane area, which is fixed on the outer shell, and then enters a runner area, turns the runner by flushing and drives a shaft system to rotate, in this way, the energy of water flow is converted into the mechanical energy for rotation.

Description

technical field [0001] The invention relates to the technical field of water conservancy machinery, and relates to a device for converting the energy contained in pressurized water flow into rotational mechanical energy, in particular to a two-stage ultra-low specific speed tubular water turbine. Background technique [0002] In petrochemical, smelting and other large and extra-large enterprises, most of them use circulating water cooling towers to reduce the temperature. Due to various reasons, most of the water pumps that provide circulating water for cooling towers have enough head margin. Using this margin to design The power of the water turbine is enough to replace the motor that the cooling tower drives the cooling fan to rotate to achieve the purpose of energy saving. [0003] The internal space of the cooling tower is small, so the water turbine driving the fan should be as small and efficient as possible. According to the flow rate, rotational speed and abundant w...

AI Technical Summary

Problems solved by technology

According to the flow rate, rotational speed and abundant water head provided by the circulating water of the cooling tower, the unit specific speed converted into the turbine is between 50-60. Type selection between type and Francis type, but because the tail water outlet of the turbine working in this case is pressurized water, and the efficiency of the impact type turbine is too low (generally not high) in the working environment with pressurized tail water 75%), the shaft power cannot meet the requirements, and the nozzles need to be arranged, occupying a large horizontal space, which directly affects the ventilation effect of the cooling tower, and then affects the cooling effect of the cooling tower; although the Francis turbine is specially designed in terms of efficiency, it can Meet the requirements, but because the mixed-flow volute also takes up a lot of horizontal space, it also affects the cooling effect of the cooling tower

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