A one-way airflow dual fan assembly of dismantling ease, comprising a first installation casing and a second installation casing, the first installation casing is aligned with the second installation casing, a flap is respectively fixed in both the first installation casing and the second installation casing, a cover plate is provided in the flap, connection mechanisms are provided between the cover plate and the flap, the flap is connected with the cover plate via the plurality of connection mechanisms, and the connection mechanisms comprise respectively a flexible connection component and a limiting part. By cooperation of the cover plates and the connection mechanisms, by pulling the cover plates, under limiting actions of the second wedges, the first wedges are pressed, the U-shaped connection blocks deform flexibly until the flexible connection components are released, and the cover plates are released from the flaps, so that the cover plates can be disassembled.

A pump arrangement includes an axial-flow machine and a drive to convey fluid mounted in a housing. The axial-flow machine is formed by at least one first rotor having permanent magnets, a shaft connected to the first rotor and a stator arrangement with stator teeth distributed concentrically around the shaft axis circumferentially and axially separated from the first rotor by an air gap. The stator teeth have axially-opposite end portions and a tooth core therebetween wound with at least one coil winding. The second end portion, turned away from the first rotor, of each stator tooth forms a tooth root joined to a back plate. The first rotor is an eccentric disk and on the side away from the stator arrangement has an eccentric cam, radially spaced from the shaft axis, and rotatably and torque-transmittingly connected to the drive. An axial-flow machine and a compressor includes the pump arrangement.

A counter rotating axial air moving device structure is disclosed. The rear rotor includes a rear hub and rear blades, and a pitch angle of each of the rear blades increases gradually in a direction away from the rear hub. The front rotor, the rear rotor and the stator component are stacked with each other. The ratio of the thickness to the diameter is equal to or greater than about 0.25 and equal to or less than about 0.8. Therefore, a better performance curve is obtained, and the vibration and noise are avoided.

An outdoor unit for an air conditioner, and an air conditioner are provided. The outdoor unit has a housing and a draught fan. The housing is provided with a first air exchange port and a second air exchange port. The draught fan is arranged in the housing and located between the first air exchange port and the second air exchange port. The draught fan has an electric motor, a first fan, and a second fan. The electric motor has two rotors which rotate independently of each other, and a first output shaft and a second output shaft connected to the two rotors respectively. The first output shaft and the second output shaft are respectively fixedly connected to the first fan and the second fan for driving the first fan and the second fan to rotate independently of each other.

A fan includes a first blower and a second blower each having an impeller. The first blower includes a first motor and a first motor drive controller to control driving of the first motor and communicate with the second blower. The second blower includes a second motor and a second motor drive controller to control driving of the second motor and communicate with the first blower. The first motor drive controller controls the driving of the first motor based on a result of communication with the second blower.

An air mover assembly may include an air mover comprising a body and a cable extending from the body and one or more air mover holders mechanically coupled to the body. The one or more air mover holders may comprise a plurality of cable maintenance features and a keying feature. The plurality of cable maintenance features may include a first cable maintenance feature configured to maintain the cable in a first configuration of the air mover in a first airflow direction and a second cable maintenance feature configured to maintain the cable in a second configuration of the air mover in a second airflow direction. The keying feature may be configured to mechanically interface with an interfering feature of a chassis when an attempt is made to improperly insert the air mover into the chassis in accordance with a proper airflow direction configuration of the chassis, in order to prevent improper insertion of the air mover into the chassis in accordance with the proper airflow direction configuration of the chassis.

A dual rotating axial fan includes a first axial fan element having a first motor that rotates a first impeller, a second axial fan element having a second motor that rotates a second impeller, and a clamping element coupling the first axial fan element to the second axial fan element in series so that the first axial fan element or the clamping element can move relative to the second axial fan element.

A contra-rotating fan system includes a fan chassis. A first fan in the fan chassis includes blades that provide airflow in a first direction when the first fan rotates in a second direction, and provide airflow in a third direction opposite the first direction when the first fan rotates in a fourth direction opposite the second direction. A second fan adjacent the first fan in the fan chassis includes the same number of blades as the first fan. The first fan and the second fan rotate at the same time in opposite directions. The blades on the second fan provide airflow in the first direction when the first fan rotates in the second direction and the second fan rotates in the fourth direction, and provides airflow in the third direction when the first fan rotates in the fourth direction and the second fan rotates in the second direction.

An axial fan includes a housing, an upper motor, and a lower motor. The housing includes an upper housing and a lower housing. A lower peripheral wall of the lower housing includes first engaging portions and lower protruding pieces. The lower protruding pieces oppose the first engaging portions in an axial direction and protrude axially upward from an axially upper surface. An upper peripheral wall of the upper housing includes upper engaging claws and upper notch grooves. The upper engaging claws extend axially downward from an axially lower surface, and include a second engaging portion that engages with the first engaging portion in a lower end portion. The upper notch grooves are notched axially upward from the axially lower surface radially inward of the upper engaging claw. At least a portion of the lower protruding pieces is located in the upper notch grooves.

The present disclosure relates to a fan apparatus (1). The fan apparatus (1) includes an impeller (12A, 12B, 12C, 26A, 26B) for generating a flow of air. A drive means (14) is provided for driving the impeller (12A, 12B, 12C, 26A, 26B). At least in certain embodiments, the drive means (4) includes a turbine (18) adapted to be rotated by a working liquid supplied to the fan apparatus (1). The fan apparatus (1) described herein is suitable for providing air ventilation and/or air extraction, for example.