Water turbine

Abstract

The invention discloses a water turbine. The water turbine comprises a volute with an inner cavity and a tail water pipe. The tail water pipe communicates with a water outlet on the volute so that a water flow channel can be formed between the volute and the tail water pipe. A rotating wheel is arranged in the volute. The rotating wheel and the volute are in running fit, and a part of the rotatingwheel is located in the water flow channel. The water turbine is characterized in that a water drain pipeline is arranged in the rotating wheel, and a gap between the rotating wheel and the volute communicates with the water flow channel through a water drain pipeline, so that accumulated water in the gap between the rotating wheel and the volute flows back into the water flow channel through thewater drain pipeline. According to the water turbine, the pressure in the gap between the rotating wheel and the volute is reduced in a drainage manner, and therefore rotating resistance of the rotating wheel is reduced, the service life of the rotating wheel is prolonged, and the maintenance frequency is reduced.

Description

technical field [0001] The invention relates to the technical field of turbomachinery, in particular to a water turbine. Background technique [0002] The water turbine is an important energy conversion device that converts water flow energy into mechanical energy, and it is also an important core unit for hydropower generation in the utilization of new energy. The existing water turbine mainly includes a volute, a draft tube, a runner and a generator. The flowing water flows from the water inlet of the volute into the spiral and accelerates to form a high-pressure water flow that impacts the runner and is finally discharged through the draft tube. The wheel rotates, and then drives the generator to rotate and generate electricity through the transmission shaft. Since the part of the runner protrudes into the volute, there must be a rotation gap during the rotation of the runner and the volute, which will inevitably cause the water flow to enter the gap between the runner a...

AI Technical Summary

Problems solved by technology

[0004] Second, the impurity particles in the water flow will be brought into the gap between the runner and the volute, and long-term accumulation will cause the contact surface between the runner and the volute to wear and affect the service life of the runner

[0005] Third, the continuous high-pressure water flow will always maintain a large axial thrust between the runner and the volute, so the bearing of the runner will continue to bear a large axial force, which will inevitably lead to the acceleration of the bearing wear and tear

[0006] Of course, in the prior art, it has also been considered to install a sealing structure between the runner and the volute, but since the operating environment of the water turbine is in a low temperature, humid, and high pressure environment for a long time, the ordinary rubber sealing ring not only cannot meet the pressure demand but also easily Aging and damage, especially for large water turbines, the maintenance cost is high, which is obviously not conducive to actual needs, and the seals of special materials are not only expensive, but also the size of the seals required for large water turbines is also large, so It is difficult to guarantee the processing accuracy of the larger-sized seals, and it is not conducive to installation, and it is even difficult to ensure the assembly accuracy during the installation process.

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