A centrifugal air-sending device has blades that each have a vane length in a first region that is greater than a vane length in a second region, and are each formed such that a proportion for which a turbo vane portion accounts is higher in a radial direction than a proportion for which a sirocco vane portion accounts in the first region and the second region. The blades that are located closer to an outer circumference than is a blade inner diameter of inner circumferential ends of the blades at end portions of the blades that are close to a side plate in an axial direction are defined as a blade outer circumferential portion that is formed such that a vane thickness of each of the blades in decreased in the radial direction from an inner circumference toward the outer circumference.

A disclosed submersible pump apparatus includes a three-dimensional frame, a pump housing, a drive shaft, an impeller, and first and second motors. The impeller is mounted on the driveshaft within the pump housing and is driven by one or both of the motors. The first motor is connected to a first end of the drive shaft and the second motor connected a second end of the drive shaft. The first and second motors are hydraulic motors and in a first configuration, the first and second motors are configured to cooperatively rotate the drive shaft with hydraulic fluid supplied to and removed from the first and second motors using a parallel fluidic connection. In a second configuration, only one of the motors has a drive gear and drives the drive shaft while the second motor does not have a drive gear and acts as a frictionless bearing supporting the drive shaft.

An air mover is provided. The air mover includes a housing, a spacer, a co-axial motor, a first fan and a second fan. The housing includes a first housing member and a second housing member. A first inlet, a second inlet and an outlet are formed on the housing. The first inlet is formed on the first housing member and the second inlet is formed on the second housing member. The spacer is disposed between the first housing member and the second housing member. The co-axial motor includes a shaft, wherein the co-axial motor is disposed on the spacer. The shaft includes a first free end and a second free end. The first free end extends in a first direction, and the second free end extends in a second direction.

An impeller includes a backing plate, a rim disposed so as to face the backing plate, and a plurality of blades arranged in a circumferential direction around a virtual rotation axis of the backing plate. Each of the plurality of blades has an inner circumferential end, an outer circumferential end a sirocco blade portion being forward-swept and including the outer circumferential end and having a blade outlet angle of larger than 90 degrees, and a turbo blade portion being swept-back and including the inner circumferential end, a first region located closer to the backing plate than a middle point in an axial direction of the rotation axis, and a second region located closer to the rim than the first region. Each of the plurality of blades is formed such that a blade length in the first region is longer than a blade length in the second region. In the first region and the second region, a ratio of the turbo blade portion in the radial direction is larger than a ratio of the sirocco blade portion in the radial direction.

A centrifugal heat dissipation fan including a hub, a frame, and double-layer fan blade sets is provided. The double-layer fan blade sets surround the hub and are arranged along a radial direction at an inner layer and an outer layer. A gap is maintained along the radial direction between the fan blade set located at the inner layer and the fan blade set located at the outer layer. The frame is connected to the hub and the fan blade set located at the outer layer.

The invention relates to a respiratory assistance apparatus (10) comprising a rigid internal casing (1) comprising a motor compartment (3) within which a motorized micro-blower (2) is arranged. The casing (1) is formed from a first and a second half-casing (1a, 1b) which are rigidly connected to each other in a leaktight manner.

The present invention provides an impeller assembly and cutting equipment provided with the impeller assembly. Compared with cutting equipment for an external dust cleaner in the prior art, the present invention has a dust suction function and a dust collection function itself, is more convenient to operate in no need of cooperating with an external vacuum cleaner, and thus is applied more widely and not limited by working conditions. By reasonably setting a curvature of each first vane, a first impeller which is in rotation can suck a radial movement of surrounding air along a motor. The first impeller is disposed in the cutting equipment for forming a negative pressure in the cutting equipment, thereby realizing a dust suction function of the cutting equipment. A heat dissipation area of a rotor can be increased by providing a plurality of second impellers on a second impeller, thereby achieving a heat dissipation function of the rotor.

A blower including a housing at least partially defining a chamber, a motor including a drive shaft defining a rotational axis, an impeller driven by the motor to generate an air flow in the chamber, and a coupler operably connected between the drive shaft and the impeller. The chamber may have an axial height which increases from a position proximate a back plate to a position spaced from the back plate. The chamber may have a non-circular cross-section proximate a chamber outlet, and a tube assembly in fluid communication with the chamber may have a tube inlet with a non-circular cross-section. The impeller may define two separate airflow paths each having an inlet and an outlet.

A method of assembling a fan wheel includes forming a first wheel portion including a first plurality of impeller blades and a first connector, forming a second wheel portion including a second plurality of impeller blades and a second connector, affixing an end of each of the first plurality of impeller blades to a first surface of a support ring such that the first connector is affixed to the second connector, and affixing an end of each of the second plurality of impeller blades to a second surface of a support ring.

The present invention relates to a blower. A blower according to one embodiment of the present invention comprises: an upper fan for generating a first airflow, which is suctioned through an upper suction part and is then discharged; a lower fan disposed under the upper fan to generate a second airflow, which is suctioned through a lower suction part and is then discharged; an airflow changing device disposed between the upper fan and the lower fan to generate a third airflow by joining the first airflow and the second airflow; and a control part for controlling the rotation speed of each of the upper fan and the lower fan to adjust the discharge direction of the third airflow.