Noise reduction system for a rotary positive blower

摘要

A rotary positive blower is driven by a drive device and has an intake port and an exhaust port. A plurality of conduit arrangements each having an inlet coupled to the exhaust port and an outlet, each of the plurality of conduit arrangements have a first predetermined diameter in at least a given portion; and a restriction is disposed in at least one of the plurality of conduit arrangements between the inlet and the outlet of this at least one arrangement, the restriction has a predetermined length and a second predetermined diameter less than the first predetermined diameter to cooperate in reduction of noise and improved efficiency of the drive device and the rotary positive blower.