Bent ventilation conduit for air conditioning system of motor vehicle, has noise attenuating unit with reflecting zone located in bending section, opposite to upstream section, and partially reflecting incident waves towards opening

摘要

#CMT# #/CMT# The conduit (10) has an upstream section (12) provided with an opening (14), and a bending section (20). A noise attenuating unit includes a plane reflecting zone (30) that is located in the bending section, opposite to the upstream section. The attenuating unit partially reflects incident waves towards the opening. The reflecting zone is oriented so as to form an angle of 90 degrees with respect to a longitudinal axis of the upstream section. #CMT#USE : #/CMT# Bent ventilation conduit for an air conditioning system of a cab interior of a motor vehicle (claimed). #CMT#ADVANTAGE : #/CMT# The arrangement of the reflecting zone allows slight increase of the volume of the ventilation conduit in an efficient manner. The reflecting zone arranged on the bending section forms an empty expansion zone, thus avoiding that the expansion zone does not cause turbulences or undesired degradation of the air flow. The configuration of the ventilation conduit enables to reduce fabrication cost of the conduit in a simple manner. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic sectional view of a ventilation conduit including a bending section with an acoustic device. 10 : Bent ventilation conduit 12 : Upstream section 14 : Opening 20 : Bending section 30 : Plane reflecting zone.