Blower
AssigneeMilwaukee Electric Tool Corporation
InventorsAdam Czerwonka, Adam Ostrowski
Life of this patent
Estimating the term…
Abstract
Blowers, e.g., for use in outdoor applications, are provided. A blower includes an air inlet; an air outlet; and a fan assembly disposed between the air inlet and the air outlet. The fan assembly has a three-stage fan. The three-stage fan includes three axial fans mounted on a drive shaft and three stator fans arranged in series with the axial fans, wherein each axial fan comprises a plurality of blades each having a blade tip. The three-stage fan has a dimensionless flow coefficient Φ in a range from about 0.3 to 0.5 as calculated by the equation Φ=(q/(A))/ωR where q represents flow (m3/s), A represents cross sectional area at the fan (m2), ω represents speed (rad/s) and R represents fan tip radius (m) measured at a blade tip.
Claims19
A blower comprising:
- an air inlet;
- an air outlet;
- and
- a fan assembly disposed between the air inlet and the air outlet,
- wherein the fan assembly comprises a three-stage fan,
- wherein the three-stage fan comprises three axial fans mounted on a drive shaft and three stator fans arranged in series with the axial fans, wherein each axial fan and each stator fan comprises an inlet side and an outlet side, wherein the inlet side is disposed nearer to the air inlet than the outlet side, and wherein the outlet side is disposed nearer to the air outlet than the inlet side,
- wherein each axial fan comprises a plurality of blades each having a blade tip, and
- wherein the three-stage fan has a dimensionless flow coefficient Φ in a range from about 0.3 to 0.5 as calculated by the equation
- Φ
- =
- q
- /
- (
- A
- )
- ω
-
- R
- where q represents flow (m3/s), A represents cross sectional area at the fan (m2), ω represents speed (rad/s) and R represents fan tip radius (m) measured at a blade tip.
Dependencies are inferred from the claim text.