Sand blocking type corrugated pipe expansion joint for hydroelectric power station

Abstract

The invention relates to a sand blocking type corrugated pipe expansion joint for a hydroelectric power station, and relates to a structure of a water diversion pressure pipeline stretching compensator of the hydroelectric power station. The sand blocking type corrugated pipe expansion joint comprises a corrugated pipe and a guide cylinder, wherein the corrugated pipe is sleeved on the guide cylinder, one end of the corrugated pipe is fixedly connected with an upstream steel pipe, and the other end of the corrugated pipe is fixedly connected with a downstream steel pipe; and one end of the guide cylinder is fixedly connected with the downstream steel pipe, and an elastic packing is arranged between the guide cylinder and the corrugated pipe. The sand blocking type corrugated pipe expansion joint provided by the invention has the advantages that the structure is simple, the cost is low, the manufacture and installation are convenient, the service life is long, the sand blocking type corrugated pipe expansion joint can automatically prevent sand grain sundries from entering the gap between the guide cylinder and the corrugated pipe, and meanwhile, the sand blocking type corrugated pipe expansion joint can guarantee not to generate excessive compressive stress on the corrugated pipe; and the sand blocking type corrugated pipe expansion joint can be widely used to circulating pipelines such as water conservancy, electric power and chemical industry.

Description

technical field [0001] The invention relates to the structure of a telescopic compensator for a diversion pressure pipeline of a hydropower station. Background technique [0002] So far, one of the means to solve the displacement of the diversion pipes of hydropower stations due to geological changes or temperature changes is to install bellows expansion joints between the pipes. This expansion joint is composed of a bellows and a guide tube. Since the gap between the bellows and the guide tube is subjected to radial or angular displacement, the gap is changed. When the sand or debris in the water flow passes through the gap Entering and depositing in the bellows, these sand particles or sundries accumulate for a long time, which will cause the bellows to fail to deform properly, so that the bellows expansion joint has no telescopic function. In order to restore the telescopic function of the bellows expansion joint, it is only possible to periodically remove the guide tube...

AI Technical Summary

Problems solved by technology

This certainly solves the problem that the expansion joint of the bellows is consolidated by sand particles and loses its telescopic deformation function. However, the water must be shut down when the guide tube is removed, and the pressure pipes of the hydropower station are relatively large in diameter, with an average diameter of 1 to several meters, the size of the corresponding bellows expansion joint is also large, and the difficulty of maintenance work is also great

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