INSULATED EXHAUST PIPE AND METHOD AND MEANS FOR PRODUCING AND CONNECTING SAME

摘要

An insulated exhaust pipe (10) comprising inner and outer spaced corrugated metallic tubes (12, 14) separated by a layer of low density refractory fiber insulation (16) and strips of higher density refractory fibers insulation (18). The pipe (10) is made by adhering the insulation (18) to the inner tube (12) and inserting the insulated inner tube (12) into the outer tube (14) while rotating it so that the corrugations (22) of the outer tube (14) do not damage the insulation (18). Attachment means (134) for connecting a corrugated insulated pipe (154) to an element in the exhaust system means include a conduit (130) having a transverse lug (138) which allows the conduit (130) to be threaded into the pipe (154). The end of the pipe (154) is received in an end cap (142) slidably mounted on the conduit (130). A stop (140) on the conduit (130) limits relative movement of the pipe (154) and conduit (130), permitting the connection between the pipe (154) and conduit to be tightened.