Dual-seal socket and spigot type flexible connection structure for large-diameter spiral welded steel pipes

Abstract

The invention provides a dual-seal socket and spigot type flexible connection structure for large-diameter spiral welded steel pipes. Two spiral welded steel pipes socketed with each other include a spiral welded spigot pipe and a spiral welded socket pipe; two parallel annular grooves are formed in a connecting end of the spiral welded spigot pipe by a groove pressing machine; a connecting end of the spiral welded socket pipe is expanded and formed by an expanding die; two special-shaped seal rings are put into the annular grooves, the outer diameters of the special-shaped seal rings after installation are greater than the outer diameter of the spiral welded spigot pipe, and the spiral welded spigot pipe and the spiral welded socket pipe are connected in an insertion manner by a special tool or tooling. The dual-seal socket and spigot type flexible connection structure for the large-diameter spiral welded steel pipes solves a thermal expansion and cold contraction problem of rigid connection and is quick to mount, convenient, good in seal property and reliable; if slight displacement between the two pipes occurs, seal pressures are same and leakage cannot be caused.

Description

technical field [0001] The invention relates to a large-diameter spiral welded steel pipe double-seal socket flexible connection structure, which belongs to the field of mechanical technology. Background technique [0002] Xinjiang has a vast land and abundant resources, drought and little rain, severe water shortage, large temperature difference between day and night, and long sunshine hours during the day. To expand deserts into oases and barren beaches into fertile fields, it is necessary to increase water conservancy infrastructure construction. Large-diameter spiral welded steel pipe transportation is mainly used in urban drinking water, drainage, chemical industry, large-scale power plants, and agricultural irrigation to realize long-distance water transportation, water diversion, and water transfer. In the construction process of large-diameter spiral welded steel pipe transportation project, whether flange connection or butt ring welding connection is used, the weldi...

AI Technical Summary

Problems solved by technology

In the construction process of large-diameter spiral welded steel pipe transportation project, whether flange connection or butt ring welding connection is adopted, the welding workload is heavy, labor-intensive, time-consuming, and costly, especially for steel pipes, cast iron pipes and cement pipes.

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