ELECTRICALLY-HEATED PIPES

摘要

An electrically-heated pipe or hose (1) has a central bore (9) formed by an extruded nylon tube (8) that is coated with an extruded layer (10) of electrically-conductive plastics within a protective sleeve (2) . Bare-wire conductors (11,12) embedded diametrically opposite one another in the layer (10) , run lengthwise of the hose (1) , so that electric current supplied via a cable (5) flows in the layer (10) around the tube (8) to heat it along its length. Supply of electric current to hoses (28-30, each having the form of hose 1) within a selective catalytic reduction system (SCR) of a diesel-powered vehicle engine (20) , maintains flowability of a urea solution injected into the exhaust (21) of the engine (20) .