Corrugated pipe

Abstract

The invention discloses a corrugated pipe which comprises a body. A plurality of peak parts and a plurality of valley parts continuously alternate on the body in the longitudinal direction; the shapesof the multiple peak parts are the same, and the cross sections of the peak parts are each in a U shape; U-shaped arc sections are composed of the first arc section, the second arc section and the third arc section; the curvature radiuses of the first arc section and the third arc section are R1, the curvature radius of the second arc section is R2, and R2 is smaller than R1; the circle centers of the first arc section and the third arc section coincide, and the circle centers of the second arc section and the third arc section do not coincide; and the shapes of the valley parts are the sameas those of the peak parts. In the extrusion forming process of the corrugated pipe, the problems of inner wall corrugation and outer wall thinning cannot occur to bent parts, and therefore the service life is prolonged; and the corrugated pipe is resistant to high temperature and high pressure and can be used under the working conditions that the temperature is 400 DEG C, and the pressure is 250KG.

Description

technical field [0001] The invention relates to the technical field of bellows, in particular to a bellows. Background technique [0002] During the use of bellows, the maximum stress of the bellows structure occurs on the inner wall of the wave trough, which is compressive stress and will not damage the structure. The maximum tensile stress occurs on the inner wall of the wave crest. The structural blasting starts from the inner wall of the wave crest, so the blasting parts are all appear at the crest. In the process of corrugated pipe extrusion, the pipe is plastically deformed under the constraints of the mold. For example, the inner ring of the U-shaped bellows in the bending part has wrinkles and the wall thickness of the outer ring is thinned, so that the inner wall of the corrugated pipe is in use. When it is more prone to damage, it will affect the service life of the bellows. Contents of the invention [0003] The object of the present invention is to provide a ...

AI Technical Summary

Problems solved by technology

In the process of corrugated pipe extrusion, the pipe is plastically deformed under the constraints of the mold. For example, the inner ring of the U-shaped bellows in the bending part has wrinkles and the wall thickness of the outer ring is thinned, so that the inner wall of the corrugated pipe is in use. It is more prone to breakage and affects the service life of the bellows

Images