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US 2019/0099874 A1Published application
Hand-held electric power tool
AssigneeNanjing Chervon Industry Co., Ltd.
InventorsQingsong Yang, Wei Wei
Life of this patent
Estimating the term…
Abstract
A hand-held power tool includes a housing, a motor having a motor shaft, and a fan mounted onto the motor shaft and driven by the motor. The fan has a plurality of large and small fan blades arranged in a staggered form on a surface of the fan. Such arrangement of the fan blades effectively improve the heat dissipation efficiency of the power tool.
Claims8
A hand-held power tool, comprising:
- a housing;
- a motor positioned in the housing, the motor having a motor shaft;
- a tool accessory device configured to support a tool accessory;
- an output shaft for driving the tool accessory and arranged substantially perpendicular to the motor shaft;
- a transmission mechanism configured to operably connect the motor shaft to the output shaft;
- a fan mounted onto the motor shaft and configured to be driven by the motor;
- a guide cover configured to receive the fan therein;
- wherein the housing has an air inlet and an air outlet and an external air flow flows through the motor and the fan via the air inlet and out of the housing via the air outlet;
- wherein the fan has a fan surface with a plurality of large and small fan blades positioned thereon and the large fan blades and the small fan blades are arranged such that each of the small fan blades is located between every two adjacent large fan blades;
- wherein each of the large fan blades and the small fan blades has a respective head located adjacent to the motor shaft, and a respective tail located away from the motor shaft;
- wherein the head of the large fan blade is disposed closer to the motor shaft along a radial direction of the fan than the head of the small fan blade;
- wherein the fan has a fan blade inlet between the heads of the large fan blade and the adjacent small fan blade, and a fan blade outlet between the tails of the large fan blade and the adjacent small fan blade;
- and
- wherein the fan blade inlet and the fan blade outlet are arranged such that, during operation of the power tool, a first inlet velocity at the fan blade inlet is substantially equal to a second outlet velocity at the fan blade outlet.
11 more elements
A hand-held power tool, comprising:
- a housing;
- a motor positioned in the housing, the motor having a motor shaft;
- and
- a fan mounted onto the motor shaft and driven by the motor;
- wherein the housing has an air inlet and an air outlet and an external air flow flows through the motor and the fan via the air inlet and out of the housing via the air outlet;
- wherein the fan has a plurality of large and small fan blades alternately arranged on a surface of the fan;
- wherein each of the large fan blades and the small fan blades has a respective head located adjacent to the motor shaft and a respective tail located away from the motor shaft;
- wherein the fan has a fan blade inlet between the heads of the large fan blade and the adjacent small fan blade and a fan blade outlet between the tails of the large fan blade and the adjacent small fan blade;
- and
- wherein the fan blade inlet and the fan blade outlet are arranged such that, during operation of the power tool, a first inlet velocity at the fan blade inlet is substantially equal to a second outlet velocity at the fan blade outlet.
7 more elements
Dependencies are inferred from the claim text.