A neck fan includes an arc-shaped housing configured to hang around user's neck and at least four fan assemblies arranged in the housing. The housing includes a first part and a second part. Each of the first part and the second part defines an accommodating space, air inlets and air outlets communicated with the accommodating space, at least one partition is arranged in the accommodating space and configured to divide the accommodating space into at least two accommodating parts arranged along an extension direction of the housing. Each of the fan assemblies is arranged in one of the at least two accommodating parts and is configured to direct air into the one of the at least two accommodating parts through corresponding air inlets and to direct air out of the one of the at least two accommodating parts through corresponding air outlets.

In one or more embodiments, an information handling system fan may include: a hub; multiple fan blades radially attached to the hub and configured to rotate perpendicularly to a longitudinal axis of the information handling system fan; an electric motor; a drive shaft parallel to the longitudinal axis of the information handling system fan that attaches the electric motor to the hub; and a housing that houses the hub, the multiple fan blades, and the electric motor. In one or more embodiments, the housing may have a concave portion perpendicular to the longitudinal axis of the information handling system fan, in which the housing may include a first vent in the concave portion of the housing to intake air as the multiple fan blades rotate and in which the housing may include a second vent configured to exhaust the air as the multiple fan blades rotate.

The present invention provides an air purifier including a plurality of bi-directional fans, which are arranged to be misaligned in a vertical direction such that the discharge directions of discharge ports are different from each other.

A noise suppression system for an air-cooled internal combustion engine is disclosed. The system may include an acoustically designed shroud forming a cavity and configured for attenuating noise produced by a cooling air fan associated with the engine. In one system, the shroud is mountable on a housing of the air fan. A pair of air inlet passages may be provided which are operable to draw ambient cooling air into the shroud to the fan. The air inlet passages are acoustically configured and tuned to attenuate noise generated by the fan. In one system, the air inlet passages may each be formed in a rear quadrant of the shroud. Various configurations of the shroud may include quarter wave resonators and/or micro-perforated panels to further attenuate fan noise.

A disclosed centrifugal blower comprises: a centrifugal fan; a scroll casing which is configured so as to surround the centrifugal fan, has an air inlet on at least one surface thereof, has an air outlet on one side thereof, and guides, to the air outlet, air discharged from the centrifugal fan; an expansion part which is provided at the air outlet and is configured such that the cross-sectional area of the flow path is expanded in the air discharge direction; and a dividing plate which is provided in the expansion part, is arranged at the outside of the air outlet and is arranged lengthwise along the flow direction of the air discharged from the air outlet.

Systems and methods are provided for cooling electronics and rear end stator windings in an alternator. The system includes an alternator having a rotor assembly, stator assembly, and dual-sided fan disposed in a housing. The housing includes a drive end, rear end, and sides. The rotor assembly includes drive end and rear end poles. The stator assembly surrounds the poles and includes drive end and rear end stator windings. The dual-sided fan is mounted to the rotor assembly adjacent the rear end poles within the housing. The dual-sided fan includes a separating wall, drive end blade set, and rear end blade set. The drive end blade set extends from a first side of the separating wall and at least partially faces the drive end. The rear end blade set extends from a second side of the separating wall and at least partially faces the rear end.

A blower assembly includes a blower housing and a fan wheel mounted within the blower housing and being rotatable about an axis of rotation. The fan wheel includes a support disk positioned near a center of the fan wheel. A first wheel portion having a first plurality of impeller blades is positioned adjacent a first side of the support disk. A second wheel portion having a second plurality of impeller blades is positioned adjacent a second side of the support disk. The first wheel portion and the second wheel portion are asymmetrical about a plane oriented perpendicular to the axis of rotation and intersecting the support disk.

A forward curved blower wheel has fan blades having relatively small leading edge blades angles and a relatively lengthy mean camber lines. The blower wheel also comprises leading edge notches adjacent its blower wheel inlet. The leading edge notches eliminate buffeting that would occur with such blades if such notches were not present.

A motor assembly having a rotational axis includes a motor housing comprising a plurality of cooling openings extending therethrough and defining a chamber. The motor assembly also includes a stator fixedly coupled to the motor housing and positioned within the chamber. A rotor is coupled to at least one of the motor housing and the stator, wherein the rotor is configured to rotate about the axis and is positioned within the chamber. The motor assembly includes a fan having a first inlet side on a first axial side of the fan and a second inlet side on a second, opposing, axial side of the fan. The fan is configured to draw cooling air in a first direction through the at least one cooling opening into the first inlet side, and the fan is also configured to draw cooling air in a second, opposite direction into the second inlet side.

A centrifugal fan and a clothing dryer. The centrifugal fan includes a housing as well as an impeller and a worm tongue disposed in the housing. The housing has an air inlet and an air outlet. The volute tongue includes a first volute tongue and a second volute tongue that are stacked and staggered. The first volute tongue cuts the air blown from the impeller and guide the air to the air outlet when the impeller rotates forward. The second volute tongue cuts the air blown from the impeller and guide the air to the air outlet when the impeller rotates backward. When the impeller rotates, the first volute tongue or the second volute tongue can cut the air blown from the impeller and guide the air to the air outlet, so that the centrifugal fan can blow out air when the impeller rotates forward and backward.