Abstract: A dust collection device for use with a power tool includes a housing, an air inlet pipe, a cyclone pipe, an air duct pipe, and a ventilation pipe. The air inlet pipe is configured to guide an airflow to enter the dust collection device along a first straight line. The cyclone pipe extends along the second straight line. The cyclone pipe has a first end for air intake and a second end for dust discharge. The ventilation pipe is arranged at the first end and communicated with the cyclone pipe and is configured to guide the airflow after the airflow is subjected to dust separation performed by the cyclone pipe out of the housing. The second straight line along which the cyclone pipe extends intersects the first straight line to form an angle greater than or equal to 25° and less than or equal to 90°.

Abstract: A blower includes an axial fan for generating airflow. The axial fan includes a center hub capable of rotating around a central axis and several blades extended outward from the center hub in a radial direction and arranged around the central axis. The several blades and the center hub are integrated as a whole. Each blade is provided with a suction surface and a pressure surface for generating airflow. Two opposite ends of the suction surface and a pressure surface are intersected to form a front edge and a rear edge, and the front edge is in the front of the rear edge in a rotation direction of the axial fan. The front edge has a point close to the center hub which is defined as a root point, and the front edge has another point far from to the center hub which is defined as a tip point.

Abstract: A blower includes an axial fan for generating airflow. The axial fan includes a center hub capable of rotating around a central axis and several blades extended outward from the center hub in a radial direction and arranged around the central axis. The several blades and the center hub are integrated as a whole. Each blade is provided with a suction surface and a pressure surface for generating airflow. Two opposite ends of the suction surface and a pressure surface are intersected to form a front edge and a rear edge, and the front edge is in the front of the rear edge in a rotation direction of the axial fan. The front edge has a point close to the center hub which is defined as a root point, and the front edge has another point far from to the center hub which is defined as a tip point.