Universal hinge-type expansion joint

Abstract

The invention belongs to the technical field of fluid delivery pipelines and relates to a universal hinge-type expansion joint which comprises a first connecting pipe, a second connecting pipe and a rectangular universal ring. The first connecting pipe and the second connecting pipe are in abutted connection through a corrugated pipe, each of the first connecting pipe and the second connecting pipe is provided with a pair of hinge seats formed by radial extending of an outer circle, and the hinge seats axially extend towards the direction of the connecting pipe adjacent to the hinge seats to form hinge plates; the rectangular universal ring is formed by surrounding of four polygonal plates with hinge holes in the middle, each polygonal plate has a long straight edge, a short straight edge, end portions positioned at two ends of the long straight edge, and a gradually-narrowing bevel edge transiting from the short straight edge to the end portions, the hinge holes are positioned in middle sections of the end portions in the width direction, and the end portions of adjacent polygonal plates are welded at positions opposite to the short straight edges; the hinge seats of the first connecting pipe and the second connecting pipe are angularly staggered by 90 degrees respectively and are close to the long straight edges of the corresponding polygonal plates, and the hinge plates are hinged to the hinge holes of the corresponding polygonal plates. The universal hinge-type expansion joint has the outstanding advantages of high load-bearing capacity in each direction, flexibility in rotating, long fatigue life, controllability in angular displacement and compact structure.

Description

Technical field [0001] The invention relates to an expansion joint, in particular to a universal hinge type expansion joint, which belongs to the technical field of fluid conveying pipelines. Background technique [0002] Universal hinge type expansion joints can absorb angular displacement in any direction and bear the axial pressure thrust generated by the bellows. Therefore, as a pipeline accessory, it has been widely used in the pipeline system of petrochemical, metallurgical, electric power, heating network and other industries. [0003] GB / T12777-2008 recommends a single universal hinge type expansion joint similar to a cross universal joint, which is mainly composed of rectangular or circular universal rings, pins, hinges, etc., and the universal ring bears axial pressure thrust; The universal ring adopts a beam structure of equal section in the side length direction. Its advantage is that the hinge seat has a simple structure, but the universal ring and hinge seat have poor...

AI Technical Summary

Problems solved by technology

Although the universal hinge type expansion joint is connected with the arc plate and the bow plate in a stepped shape, it slightly improves the problem of long product length in GB / T12777, but the universal ring is still a traditional symmetrical diamond plate structure, and its stepped shape There is obvious stress concentration at the center, which weakens the improvement of bearing capacity. At the same time, with the increase of reinforced steel plates on the universal ring and hinge seat, the problem of long product length has not been significantly improved, and it is difficult to apply to various occasions with narrow assembly space.

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