Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1995-11-28
1998-04-14
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15314, 15413, 55276, A47L 538
Patent
active
057377979
ABSTRACT:
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.
REFERENCES:
patent: 2884185 (1959-04-01), Dolan
patent: 3358316 (1967-12-01), Okun
patent: 3882961 (1975-05-01), Cannan et al.
patent: 4015683 (1977-04-01), Williams
patent: 4356591 (1982-11-01), Lude
patent: 4938309 (1990-07-01), Emdy
patent: 5365633 (1994-11-01), Sunagawa et al.
patent: 5400463 (1995-03-01), Attard et al.
Holger David K.
Johnson Douglas E.
Lauritsen Steven D.
Mann, III J. Adin
Rittmueller Stephen P.
Iowa State University & Research Foundation, Inc.
Moore Chris K.
White Consolidated Industries, Inc.
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