Patent ID: 11889794
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC A  F | IPC A  F

Claim 0:
1. A handheld blower comprising: a housing;
an air duct including an air inlet and an air outlet opposite the air inlet, the air duct defining a duct axis;
a fan disposed in the air duct between the air inlet and the air outlet, the fan configured to rotate about the duct axis;
a cover disposed in the air duct between the fan and the air outlet, the cover having a first length extending along the axis; and
a flow region disposed radially between the cover and an inner surface of the air duct, the flow region including an annular cross-sectional area that is constant along a majority of the first length,
wherein the fan includes a fan hub and a plurality of fan blades extending radially outwardly from the fan hub, each fan blade including an upstream connection point to the fan hub; and
wherein the air duct includes an air duct intake length extending axially between the air inlet and the upstream connection point, wherein the air duct includes an air duct radius between an inner surface of the air duct and the duct axis at a position between the air inlet and the upstream connection point, and wherein a ratio of the air duct radius to the air duct intake length is between 0.4 and 0.55.