corrugated pipe
corrugated pipe
A corrugated pipe of thermoplastic polymer material for use as fluid line with at least one polymer layer, comprising closed geometric outer contours which are spaced at an interval from each other in the axial direction of the pipe and which define a corrugation on the pipe jacket in at least one radial angular sector in axial, longitudinal direction one behind the other, characterized in that the closed geometric outer contours are designed in such a manner that two jacket lines of the pipe jacket surface, which lines are approximately opposite one another, are free of corrugations and that these jacket lines extend in the longitudinal direction of the pipe.
Summary of corrugated pipe
The invention relates to a corrugated pipe of thermoplastic polymer material for use as fluid line with at least one polymer layer, comprising closed geometric outer contours which are spaced at an interval from each other in the axial direction of the pipe and which define plastic pallets
on the pipe jacket in at least one radial angular sector in axial, longitudinal direction. The outer contours are protruding radially, at least partly. Especially preferred applications of corrugated pipes of the present invention are in the automobile sector for realizing liquid lines and air-conduction parts. A related German Application 197 07 518.5-24, filed with the German Patent Office on Feb. 25, 1997, is incorporated herein by reference.
Background of the corrugated pipe
Various types of corrugated pipe are known such as that described in DE 44 32 584 C1, which stems from the same applicant and in which the outer contours are designed as flattened or segmentally enlarged circles. In this embodiment the corrugations extend over all radial angular sectors in the longitudinal direction of the pipe. This results in the disadvantages explained below.
Other embodiments of corrugated pipes result from EP 0 671 582 A1; DE 43 21 575 C1 and GB 1 209 569. These known embodiments of corrugated pipes all contain outer contours which assure a wave line in all radial angular sectors on the pipe jacket surface.
Traditionally, air-conduction parts and liquid lines, e.g. coolant lines, are preferably manufactured out of rubber pipes and rubber hoses reinforced with textiles. Stackable plastic containers and hoses of thermoplastic plastics offer considerable savings of expense and weight and have, in addition, an improved recycling potential. In this material substitution a bending flexibility comparable to that of rubber pipes is required from the thermoplastic pipes.
A corrugated pipe of thermoplastic polymer material for use as fluid line with at least one polymer layer, comprising closed geometric outer contours which are spaced at an interval from each other in the axial direction of the pipe and which define a corrugation on the pipe jacket in at least one radial angular sector in axial, longitudinal direction one behind the other, characterized in that the closed geometric outer contours are designed in such a manner that two jacket lines of the pipe jacket surface, which lines are approximately opposite one another, are free of corrugations and that these jacket lines extend in the longitudinal direction of the pipe.
Summary of corrugated pipe
The invention relates to a corrugated pipe of thermoplastic polymer material for use as fluid line with at least one polymer layer, comprising closed geometric outer contours which are spaced at an interval from each other in the axial direction of the pipe and which define plastic pallets
on the pipe jacket in at least one radial angular sector in axial, longitudinal direction. The outer contours are protruding radially, at least partly. Especially preferred applications of corrugated pipes of the present invention are in the automobile sector for realizing liquid lines and air-conduction parts. A related German Application 197 07 518.5-24, filed with the German Patent Office on Feb. 25, 1997, is incorporated herein by reference.
Background of the corrugated pipe
Various types of corrugated pipe are known such as that described in DE 44 32 584 C1, which stems from the same applicant and in which the outer contours are designed as flattened or segmentally enlarged circles. In this embodiment the corrugations extend over all radial angular sectors in the longitudinal direction of the pipe. This results in the disadvantages explained below.
Other embodiments of corrugated pipes result from EP 0 671 582 A1; DE 43 21 575 C1 and GB 1 209 569. These known embodiments of corrugated pipes all contain outer contours which assure a wave line in all radial angular sectors on the pipe jacket surface.
Traditionally, air-conduction parts and liquid lines, e.g. coolant lines, are preferably manufactured out of rubber pipes and rubber hoses reinforced with textiles. Stackable plastic containers and hoses of thermoplastic plastics offer considerable savings of expense and weight and have, in addition, an improved recycling potential. In this material substitution a bending flexibility comparable to that of rubber pipes is required from the thermoplastic pipes.