公开(公告)号：US20190104899A1

公开(公告)日：2019-04-11

申请号：US15999251

申请日：2017-02-10

Applicant: Nilfisk A/S

Inventor： Peter Nøhr Larsen ,  Bilal Sahsah

IPC: A47L9/00 ,  A47L9/22 ,  F04D29/66

Abstract: A compact motor housing for housing a motor and a blower of a cleaning device and with integrated air outlet silencing. The motor housing encloses a flow passage between a flow inlet and outlet. The housing has a blower chamber fluidically connected to the flow inlet, and via first and second outlet openings also fluidically connected to at least two parallel, preferably similar, silencer ducts each being arranged in an area limited by an angle of less than 90°, seen in a view parallel with the blower and motor axis. The silencer ducts each have at least one wallbetween the blower chamber and the external wall of the motor housing for causing at least one flow direction bend, so as to provide a noise attenuating effect. The areas occupied by the at least two silencer ducts are non-overlapping, seen in a view parallel with the blower and motor axis. With a circular blower chamber, a compact box shaped motor housing can be provided with corner volumes available for silencer ducts.