Iowa State University Research Foundation Inc

White Consolidated Industries, Inc.

Stephen P Rittmueller

J Adin Mann, Iii

Douglas E Johnson

David K Holger

Steven D Lauritsen

A central vacuum cleaner having an air flow exhaust pipe is provided with a muffler comprising an elongated muffler pipe having a reduced diameter inlet and a reduced diameter outlet and a noise reducing foam liner disposed in the muffler pipe between the inlet and outlet. The foam liner includes a smooth inner surface that is generally flush with inner surfaces of the inlet and outlet. The foam liner comprises a combustion modified polyether polyurethane foam tube inserted in the muffler pipe between the inlet and outlet.

Central vacuum cleaner muffler

A central vacuum unit having an acoustic damping system is provided. The central vacuum unit includes a canister having a sidewall forming a hollow interior and a lid closing an end of the sidewall, a vacuum motor within the canister which emits noise during operation, at least one cooling air inlet for admitting cooling air into the hollow interior, and at least one cooling air outlet in the sidewall for exhausting the cooling air from the hollow interior. Additionally, the sidewall has an exhaust port and the motor has an exhaust pipe extending through the exhaust port. The acoustic damping system includes an acoustic damping tunnel, an acoustic damping canopy, and an exhaust port seal. The acoustic damping tunnel is within the hollow interior and forms a pathway between the hollow interior and the cooling air outlet. The pathway is lined with a sound absorbing material so that the tunnel reduces noise emitted from the hollow interior through the cooling outlet. The acoustic damping canopy is attached to the canopy over the cooling air inlet. The canopy has an inlet and forms a serpentine pathway between the canister cooling air inlet and said canopy inlet to reduce noise emitted from the hollow interior through the canister cooling air inlet. The exhaust port seal covers the exhaust port to reduce noise emitted from the hollow interior through the exhaust port. The exhaust port seal preferably includes flexible foam bonded to the canister sidewall.

Growing community of inventors

St. Charles, IL, United States of America

Stephen P Rittmueller