Corrugated tube of strip-form thin plate - has corrugation peaks and valleys running in plate longitudinal direction with plate wound spirally and welded or folded to form tube

摘要

The tube walls in section crossways to the corrugations and correspondingly crossways to the plate longitudinal direction, have a corrugation pattern in the form of a periodically transversal wave curve (2) with sinus wave-form basic shape and alternating valleys (4) and peaks (3) in the XY plane. The X-direction is the wave curve extending direction and the Y-direction is the transversal direction in towards the tube interior. The tube wave curve within a sector (S) of the peaks (3) directed towards the tube interior, has at least two inflection points (6,7) on opposite sides of a symmetry point (8) on the peak crown.