Thermally insulated corrugated conduit
AssigneeBrugg Rohr AG Holding
InventorsAlfred Oeschger, Roberto Rudi
Life of this patent
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Abstract
The invention relates to a corrugated, thermally insulated conduit for fluids, e.g. for district heating networks, wherein at least one medium pipe (2) made of plastic or metal is surrounded by a thermal insulation layer (14), consisting of a polyurethane foam for example. The corrugation (25, 26) of the outer jacket (15) made of plastic is formed such that both the corrugation valleys (25) and the corrugation peaks (26) are round, particularly circular. In addition, the corrugation is dimensioned such that the corrugation depth T lies in a range of 4.5 mm to 8 mm for a conduit outer diameter range of 63 mm to 202 mm. This shaping and dimensioning of the conduit results in very good flexibility and thus the ability to roll up the pipe for the transport thereof.
Claims16
A thermally-insulated, corrugated conduit (22) comprising at least one inner service pipe (2) made from plastic or metal, wherein a thermal-insulating layer (14) made of plastic surrounds the service pipe (2) and an outer housing (15) made of plastic surrounds the thermal-insulating layer (14), wherein corrugations (25, 26) circumscribing the conduit (22) are formed in the outer housing and extend into the thermal insulation layer (14), characterized in that troughs (25) and peaks (26) of the corrugations have a round cross-sectional shape with an outer diameter of the conduit in the range of 63 mm to 202 mm, and a corrugation depth T in the range of 4.5 mm to 8 mm,
- wherein the round cross-sectional shape of the troughs (25) and peaks (26) in each case is part of a circle,
- wherein the troughs (25) and peaks (26) are connected by substantially straight sections of the corrugations, each straight section extending between stations spaced longitudinally along the length of the conduit (22), and
- wherein the radius of curvature RT of the troughs (25) is greater than the radius of curvature RB of the peaks (26).
A thermally-insulated, corrugated conduit (22) comprising at least one inner service pipe (2) made from plastic or metal, wherein a thermal-insulating layer (14) made of plastic surrounds the service pipe (2) and an outer housing (15) made of plastic surrounds the thermal-insulating layer (14), wherein corrugations (25, 26) of the conduit (22) circumscribe the conduit and extend into the thermal insulation layer (14), characterized in that troughs (25) and peaks (26) of the corrugations are formed in the housing and have a round cross-sectional shape, an outer surface of the thermal-insulating layer (14) has round cross-sectional peaks mating with the corrugations of the housing, with an outer diameter of the conduit in the range of 63 mm to 202 mm, and a corrugation depth T in the range of 4.5 mm to 8 mm,
- wherein the troughs (25) and peaks (26) are connected by substantially straight sections extending between spaced locations along the length of the conduit (22),
- wherein the round cross-sectional shape of the troughs (25) and peaks (26) in each case is part of a circle, and
- wherein the radius of curvature RT of the troughs (25) is greater than the radius of curvature RB of the peaks (26).
Dependencies are inferred from the claim text.