A blower for providing a supply of air at positive pressure in the range of approximately 2 cm H.sub.2O to 30 cm H.sub.2O includes a motor, at least one impeller, and a stationary component. The stationary component includes an inlet and an outlet. The motor, the impeller, the inlet and outlet are co-axial.

A fan capable of generating omnidirectional airflow includes a central shaft and a fan body. A windward surface of each of blades of the fan body and a radial direction of a motor of the fan body are perpendicular to each other. The central shaft is perpendicular to an axial direction of the motor. The fan body is connected with one side of a support unit. The central shaft is connected with a rotary device. The central shaft is fixed to the support unit. The rotary device can drive the support unit to rotate relative to the central shaft. When the fan is actuated, the blades generate 360-degree outward airflow, and the support unit is rotated by the rotary device so that the fan can generate omnidirectional airflow.

A motor assembly of the present disclosure improves a combined structure between an impeller and a rotor to more firmly combine them. Furthermore, the impeller is combined with a rotor shaft without deformation, so the durability of the respective components may be improved.

A blower includes a housing including an inlet and an outlet, a motor to drive a rotatable shaft, first and second impellers provided to the shaft, the first and second impellers each including a plurality of impeller blades, a first stationary component provided to the housing and including stator vanes downstream of the first impeller, and a second stationary component provided to the housing and including stator vanes downstream of the second impeller. A first set of stator vanes of the first stationary component is provided around the motor and are configured and arranged to direct airflow along the motor, to de-swirl the airflow and to decelerate air to increase pressure. A blower including a third impeller and third stationary component positioned above the first impeller is also described.

A blowing device includes an impeller that rotates about a central axis, a motor disposed below the impeller in a central axis direction that drives the impeller to rotate, and a motor housing surrounding the motor. The motor housing includes a motor housing top plate extending in a direction orthogonal to the central axis and facing a lower surface of the impeller, and a motor housing cylindrical portion extending downwardly in the axial direction from an outer edge of the motor housing top plate in a radial direction. A top plate recess portion extending from the outer edge of the motor housing top plate in the radial direction to an inside in the radial direction and recessed downwardly is defined on an upper surface of the motor housing top plate.

A blowing device includes a mixed flow impeller that rotates about a central axis extending vertically, a motor that drives the mixed flow impeller to rotate, and an impeller cover surrounding an outside of the mixed flow impeller in a radial direction. The mixed flow impeller includes a hub portion extending outwardly in the radial direction toward a lower side in an axial direction, and moving blades juxtaposed on an outer surface of the hub portion in a circumferential direction. A minimum dimension of a first gap between the moving blade and the impeller cover at a lower end portion of the moving blade is larger than a minimum dimension of a second gap between the moving blade and the impeller cover at an upper end portion of the moving blade.

A motor includes a shaft that rotates about a central axis, a rotor that rotates together with the shaft, a stator that opposes the rotor in a radial direction, and a motor housing that surrounds an outside of both the rotor and the stator in the radial direction. An intermediate member is disposed between the motor housing and the stator. The intermediate member includes a first contact portion in direct contact with an upper surface of the stator, and a second contact portion in direct contact with a lower surface of the motor housing. The motor housing includes an axial direction contact portion in direct contact with a lower surface of the stator.

A noise reduction diffuser for an electric blower has a motor holder and a rear cover fitted to the motor holder. The motor holder includes a sidewall and a bottom portion at one end of the sidewall. The other end of the sidewall has an opening for mounting an electric motor inside the sidewall. An output shaft of the motor extends through the bottom portion for driving a fan. The motor holder and the rear cover form a Helmholtz resonance cavity.

A vane wheel includes a shaft and an impeller. The shaft is disposed along a center axis and is circular in plan view from an axial direction. The impeller includes an impeller cylinder portion to which one end portion of the shaft in the axial direction is fixed. The impeller cylinder portion includes a plurality of first portions and second portions on an inner circumferential surface of the impeller cylinder portion. The first portions are disposed with an interval in a circumferential direction, and are in contact with the shaft and fix the shaft. The second portions face the shaft with an interval in a radial direction, and each of the second portions is positioned between two of the first portions which are adjacent in the circumferential direction.

A vane wheel includes a shaft, an impeller, and a fixing member. The impeller includes an impeller cylinder portion into which one end portion of the shaft in an axial direction is inserted. The fixing member is disposed on one end side of the impeller cylinder portion in the axial direction and fixes the shaft and the impeller to each other. The shaft includes a step surface at the other end of the one end portion of the shaft in the axial direction. The other end surface of the impeller cylinder portion faces the step surface in the axial direction. The impeller includes a convex portion protruding in the axial direction on at least one of one end surface and the other end surface of the impeller cylinder portion in the axial direction. The convex portion is in contact with the fixing member or the step surface.