Flexible duct and the production thereof

Details Flexible duct and the production thereof Flexible duct and the production thereof

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 59/153 (2006.01) B29C 53/58 (2006.01) F16L 11/11 (2006.01)

Patent

CA 2745171

A flexible duct comprising a first, inner layer (15) that includes multiple helical windings of a strip of thin flexible material, a second layer (16) overlying and adhered to said first, inner layer and including multiple helical wind-ings of a tube (13) containing insulating material (18), and a helically wound reinforcing element (17). Also disclosed is a method of forming a flexible duct including helically wind-ing a tube containing insulating material, wherein the tube is delivered into its initial winding at a rate of delivery so that at the outer periphery of the winding the tube remains substan-tially unstretched and uncompressed circumferentially, while at the inner periphery the tube is allowed to pucker circum-ferentially. Still further disclosed is a method of forming an insulating tube, including the steps of drawing a strip of flex-ible material relatively laterally of and into a forming head that delivers the strip forwardly from the forming head as a tubular casing in the direction of the axis of the casing, and delivering fibrous insulating material into said casing at the forming head as a gas-entrained stream of the material.

L'invention concerne un conduit souple comportant une première couche intérieure (15) comprenant des enroulements hélicoïdaux multiples d'une bande en matériau souple mince, une deuxième couche (16) recouvrant et adhérant à ladite première couche intérieure et comprenant des enroulements hélicoïdaux multiples d'un tube (13) contenant un matériau isolant (18), et un élément (17) de renfort enroulé en hélice. L'invention concerne également un procédé pour former un conduit souple comportant les étapes consistant à enrouler en hélice un tube contenant un matériau isolant, le tube étant amené dans son enroulement initial à une vitesse d'amenée telle que le tube, à la périphérie extérieure de l'enroulement, reste sensiblement exempt d'étirement et de compression circonférentiels, tandis qu'à la périphérie intérieure, on permet au tube de se froncer circonférentiellement. L'invention concerne en outre un procédé pour former un tube isolant, comportant les étapes consistant à dévider une bande en matériau souple en position relative à latérale et dans une tête de formation qui distribue la bande en avant de la tête de formation sous la forme d'une enveloppe tubulaire dans la direction de l'axe de l'enveloppe, et à amener un matériau isolant fibreux dans ladite enveloppe au niveau de la tête de formation sous la forme d'un flux du matériau entraîné par un gaz.

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