Sand slurry wear-resistant high-position sealing structure for main shaft of water turbine

Abstract

The invention relates to a sand slurry wear-resistant high-position sealing structure for a main shaft of a water turbine, which is applied to main shaft sealing of a water turbine of a hydropower station in a sediment-laden river basin. A main shaft of the sand slurry wear-resistant high-position sealing structure is provided with a shaft protecting sleeve; the upper part of the shaft protecting sleeve is pressed against the root part of a wear-resistant plate installation base; the plate surface of the wear-resistant plate installation base is vertical to the central line of the main shaft, and is sleeved and fixed on the main shaft; a sealing base is fixed on a top cover through a fastening piece; an air shroud ring is arranged on the sealing base through the fastening piece by using a lower cover plate, and is encircled and hooped on the shaft protecting sleeve; a sealing ring is arranged on the sealing base through the fastening piece by using an outer cover plate; a pressure water communicating pipe fitting is communicated with the lower space of the sealing ring; the upper surface of the sealing ring is pressed against the lower surface of a wear-resistant plate; the wear-resistant plate is arranged on the lower plate surface of the wear-resistant plate installation base; and the upper cavity of a protecting hood is communicated with a sand flushing pipe fitting I and a sand flushing pipe fitting II. The sand slurry wear-resistant high-position sealing structure has the advantages that parts of a sealing device are completely prevented from being worn, the sealing performance is not influenced by machine lifting, and long-term good running is realized.

Description

technical field [0001] The invention relates to a high-position sealing structure of a main shaft of a water turbine which is resistant to sediment wear, and is applied to the main shaft seal of a water turbine in a hydropower station in a river basin with many sediments. Background technique [0002] my country is rich in hydropower resources, ranking first in the world. However, the sediment content of rivers is very high, especially the Yellow River and the Yangtze River have become silt-rich rivers, and the sediment load of other major rivers is also gradually increasing. Therefore, anti-wear measures for power stations with many sediments have become a research topic that people pay attention to. [0003] In the structural design of the unit of the silt-rich power station, it is impossible to completely copy the structure that works well in the clean water power station. The main shaft seal plays the role of a water-blocking seal in the structure of the turbine, mainl...

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Problems solved by technology

The positions of the sealing ring and the air shroud in the closed cavity are very low. Because of this, the sealing structure in the prior art is inevitably eroded by sediment and water.

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