An upstream space forming portion of a centrifugal blower has a space division portion that divides an upstream space into an inner connection space and an outer connection space. The outer connection space has an overlapping space that overlaps the space division portion in an axial direction, and a non-overlapping space excluding the overlapping space from the outer connection space. A suction port has an outer overlapping portion located outside the separation cylinder in a radial direction, and an outer non-overlapping portion excluding the outer overlapping portion from the separation cylinder located outside in the radial direction. A relationship S1/S2≥0.5 is satisfied when a first area S1 is defined by projecting a boundary between the overlapping space and the non-overlapping space in the radial direction, and a second area S2 is defined by projecting the outer overlapping portion in the axial direction.

A blower fan assembly comprising a scroll housing, a forward curved blower wheel, and a blower motor adapted to rotate the blower wheel about a blower wheel axis. The forward-curved blower wheel comprises a plurality of fan blades circumferentially spaced about the blower wheel axis. Each of the fan blades has a leading edge with a leading edge angle and a trailing edge with a trailing edge angle. The leading edge angle is at least 50° and not more than 80°. The trailing edge angle is at least 5.5° and not more than 18.5°. The outer radius is not more than 4 inches (101.6 mm).

A blower unit can include an outer housing, an inlet subassembly, a fan subassembly, an outlet subassembly, and a grommet. The outer housing can have an aperture extend along a first axis between first and second ends. The inlet subassembly can be received in the first end of the aperture. The fan subassembly can be received in the aperture adjacent to the inlet subassembly and include at least one wire. The outlet subassembly can be received in the second end. The grommet can be positioned between at least part of the second end and the outlet subassembly. The at least one wire can extend through the grommet. The grommet can seal against the at least one wire. The grommet can seal between the outer housing and the outlet subassembly.

An electric blower includes a motor, a first rotor blade provided on one end side of the motor in an axial direction, a second rotor blade provided on another side of the motor opposite to the first rotor blade in the axial direction, and a first stator blade provided to face the first rotor blade.

A motor includes a rotating portion rotatable about a center axis that extends vertically and a stationary portion that rotatably supports the rotating portion. The stationary portion includes a stator facing at least a part of the rotating portion in a radial direction, a circuit board disposed axially below the stator, and a resin portion covering at least a part of the stator, and the circuit board. The stator includes a plurality of coils disposed in a circumferential direction. The circuit board includes an axially upper surface mounted with an electric element that is disposed at least at one of positions including a position between two coils of the plurality of coils, adjacent to each other in the circumference direction, and a position below the coil.

The present invention relates to a blower, the blower according to an embodiment of the present invention comprising: a lower case having a suction hole formed therein through which air is introduced; an upper case arranged on the upper side of the lower case and having a discharge hole formed therein through which air is discharged; and a fan arranged in the lower case and including a plurality of blades. Each of the plurality of blades includes a plurality of airfoils respectively extending along different camber lines from one another, and a leading edge of connecting the leading ends of the plurality of airfoils. Entrance angles formed by the respective camber lines of the plurality of airfoils and the rotation directions of the blades are different from one another. Thus, due to the curved shape of the leading edge and the design of a recessed notch, a flow separating from the leading edge is reduced, and thus, there is an advantage in that air volume performance is improved.

A neck-hanging fan, comprises a housing that can be worn on the neck and a fan assembly, wherein the two extended tail ends of the housing are provided with an accommodating chamber, and an air duct communicating with the accommodating chamber is formed in the housing, a fan assembly is arranged in the accommodating chamber, an air inlet hole communicating with the accommodating chamber is arranged on the housing, and a plurality of air outlet holes communicating with the air duct are arranged on the outer wall of the housing, and the plurality of air outlet holes are distributed along the extension direction of the air duct. The end of the air outlet away from the fan assembly is provided with a wind gathering plate extending into the air duct, wherein a plurality of wind gathering plates are provided.

A fan with airfoil blades is provided for a regenerative air vacuum street sweeper. The blades are formed using cut and pressed upper and lower panels which are welded at a forward edge to a rod to form the airfoil leading edge and welded at the rear edges to form the airfoil trailing edge. Pins extend laterally outwardly from the rod for mounting each blade in corresponding holes in the front and rear plates of the fan housing. The side edges of the blade are welded to the plates at a 9-11° angle of attack. The airfoil blades allow for reduced size, horse power, noise, and manufacturing and shipping costs.

An impeller is provided, including a metal housing, a shaft, and a plastic member. The metal housing has a shaft mounting hole. The inner surface of the shaft mounting hole includes three or more contact points, and the contact points are closer to the shaft than other portions of the inner surface of the shaft mounting hole. The shaft passes through the shaft mounting hole and is affixed by the contact points. The metal housing divides the shaft into an upper section, a middle section, and a lower section. The plastic member passes through the shaft mounting hole and is in contact with the middle section.

An impeller comprising a hub, a shroud, a plurality of blades, and circumferential outlet. The hub extends to an outer diameter and is rotatable about a longitudinal axis. The should defines an inlet aperture, extends to the outer diameter, and is offset from the hub along the longitudinal axis to define a passageway between the hub and the shroud. The plurality of blades are located between the hub and the shroud, the blades dividing the passageway into a plurality of passages between each of the plurality of blades. The circumferential outlet is between the hub and the shroud adjacent the outer diameter. Airflow is generated by the plurality of blades, the airflow passing along a flow path within each of the plurality of passages. A size of a cross-sectional area perpendicular to the flow path increases linearly along the flow path from the inlet aperture to the circumferential outlet.