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1. (WO2002005697) A SUCTION APPARATUS WITH NOISE REDUCION MEANS

Pub. No.:    WO/2002/005697    International Application No.:    PCT/DK2001/000465
Publication Date: Jan 24, 2002 International Filing Date: Jul 3, 2001
IPC: A47L 9/00
F04D 29/66
Applicants: NILFISK-ADVANCE A/S
LARSEN, Peter, Nøhr
Inventors: LARSEN, Peter, Nøhr
Title: A SUCTION APPARATUS WITH NOISE REDUCION MEANS
Abstract:
The invention concerns a suction apparatus with noise reduction means (7, 8) in one or more airflow passages (2, 3, 4) for reducing noise emission from an airflow generator (1) or the like, wherein at least one airflow passage (2, 3, 4) is provided with at least one indentation (7) with a predetermined depth (D) extending substantially perpendicularly to the general direction of the noise in the passage. By the invention, a suction apparatus with noise reduction means is provided which is simple and efficient at reducing noise and also inexpensive to manufacture.