Patent ID: 7690077
Filing Date: 2010-04-06
Classification: A47L

Abstract:
1. A central vacuum unit configured to remove debris entrained in an air stream comprising: a canister having a sidewall forming a hollow interior; a vacuum motor disposed within the hollow interior; an exhaust port in fluid communication with the hollow interior; and an acoustic damping pathway formed within the hollow interior and adapted to receive the air stream from the vacuum motor and reduce noise produced by the vacuum motor from being emitted through the exhaust port, the pathway including a plurality of acoustic damping chambers in fluid communication with each other and having portions that are separated from each other by at least one partition substantially circumscribing the vacuum motor, the partition including at least one opening to provide fluid communication between the acoustic damping chambers, wherein the at least one opening is oriented at a position that is substantially diametrically opposed to the exhaust port such that the vacuum motor is disposed between the at least one opening and the exhaust port.