Patent ID: 11859641
Assignee: nan
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 10:
11. A method of attenuating sound emanating from an air blower, the method comprising:
providing an air blower having an intake housing, an impeller, a sound damper positioned in the intake housing, one or more baffles positioned within the intake housing, and a flow modulator tube assembly fluidly coupled between the intake housing and the impeller;
receiving air in the intake housing and directing the air from the intake housing into the flow modulator tube assembly, wherein directing the air from the intake housing into the flow modulator tube assembly comprises deflecting the air off of the one or more baffles, wherein each of the one or more baffles comprises an angled wall positioned at an angle relative to a surface of the sound damper such that the one or more baffles direct the air from the intake housing into the flow modulator tube assembly;
directing the air through a plurality of separate air flow paths in the flow modulator tube assembly and to the impeller, wherein the separate air flow paths extend from a first end of the flow modulator tube assembly to a second end of the flow modulator tube assembly and are fluidically isolated from one another between the first and second ends, wherein the separate air flow paths straighten the flow of the air through the flow modulator tube assembly and direct the air to the impeller;
directing at least some sound from the impeller through the separate air flow paths in the flow modulator tube assembly and to the intake housing, wherein the air flow paths straighten the propagation of sound through the flow modulator tube assembly and direct sound along a path to impact with the sound damper, and wherein passing sound through the air flow paths attenuates sound emanating from the air blower during operation of the air blower.