An apparatus for controlling a wireless charger for a vehicle includes a communication device to receive an input from a user and information on the vehicle, and a controller to employ one of a first driving duty ratio of a cooling fan set based on the information on the vehicle, a second driving duty ratio of the cooling fan set based on the input from the user, or a third driving duty ratio of the cooling fan set through auto-tuning operation to operate the cooling fan, to enhance charging performance of the wireless charger while minimizing the feeling of the user bothered due to operating noise of a cooling fan.

A compressor housing (12) for a turbocharger includes a recirculation cavity (4) formed in a portion of the compressor housing (12). The recirculation cavity (4) is defined by an inner cavity wall (2) and an outer cavity wall (5). In addition, an inlet groove (1) and an outlet (7) are formed in the recirculation cavity (4) for circulating airflow from the compressor housing (12) through the recirculation cavity (4), and at least one recirculation noise obstruction (6) is fixedly secured within the recirculation cavity (4) to disrupt air flow through the cavity and reduce noise in the compressor housing (12).

A fan blade (1) has a front inflow edge (2) and a rear outflow edge (3). The fan blade (1) has an at least partially wavy inflow edge (4) that forms a wave (W) having a specific three-dimensional waveform.

A centrifugal fan assembly including fan wheel, a primary inlet bell, a secondary inlet bell, and a flow grid. The primary inlet bell and secondary inlet bell direct air into an inlet of the fan wheel of the centrifugal fan. Also disclosed is a sound reduction assembly for reducing the sound produced by a centrifugal fan or centrifugal compressor. A method of directing air flowing into a centrifugal fan or a centrifugal compressor is also disclosed.

A fan blade unit and a fan impeller structure thereof. The fan blade unit includes a main body having a root section and an end section. The root section is connected with a hub. The end section extends in a radial direction away from the hub. The end section defines a first direction and a second direction. Multiple protrusion bodies are disposed at the end section and at least one channel is formed between the protrusion bodies. The channel extends in the first direction. The fan blade unit is applied to the fan impeller structure. When the fan impeller rotates, a high-pressure area is created between the channel and the wall of the outer frame of the fan, whereby the airflow is restrained from turning over from the lower wing face to the upper wing face to generate wingtip vortex.

Discharge grate intended to be mounted inside or at the outlet of a conduit of a discharge valve of a turbine engine of an aircraft, the discharge grate comprising an upstream face intended to receive a gas flow, a downstream face parallel to the upstream face and intended to deliver the gas flow received on the upstream face, and orifices passing through the perforated plate from the upstream face to the downstream face and intended to convey the gas flow through the perforated plate.

The discharge grate comprises for each orifice of the perforated plate a tubular channel, coaxial with the orifice with which it is associated, and projecting from the downstream face of the perforated plate.

A hanging head connecting mechanism of a ceiling fan has a connecting seat, a hanging rod, and a motor shaft. The connecting seat has a connecting plate, a first bushing, a second bushing, and multiple connecting pieces. The second bushing is located around the first bushing. The hanging rod is mounted in the connecting seat and disposed between the first bushing and the second bushing. The motor shaft is mounted in the connecting seat and disposed inside the first bushing. The connecting pieces are serially mounted through the second bushing, the hanging rod, and the motor shaft. Two of the connecting pieces are each mounted on a respective one of two opposite sides of the second bushing, and a wire-routing gap is formed between the first connecting piece and the second connecting piece.

A motor-fan assembly includes an assembly housing which supports a motor assembly, a working fan assembly which includes a working fan rotated by the motor assembly which draws in and exhausts working air, and a cooling fan assembly which includes a cooling fan rotated by the motor assembly which draws in and exhausts cooling air. The assembly housing includes a motor vent cover associated with the cooling fan assembly, wherein the motor vent cover further includes a sidewall with at least one vent hole therethrough and at least one socket aligned with the at least one vent hole. The assembly also includes a body having a tube opening extending therethrough, and an inner facing surface with at least one tail receivable in the at least one socket so that the at least one vent hole is contiguous with the tube opening.

A cooling fan has a fan shroud with a fan wheel recess surrounded by a shroud ring and a fan wheel rotatably mounted in the fan wheel recess for conveying the air flow along a conveying direction from a shroud upper side to a shroud underside. The fan wheel has a central hub cup with radially orientated blades and an outer ring connecting the blades at the blade tip ends. A circumferential ring gap is formed between the outer ring and the shroud ring. A rib structure in the ring gap reduces swirl in a gap flow orientated against the conveying direction. A shroud ring section of the shroud ring extends axially beyond the outer ring on the shroud underside. The shroud ring section is orientated parallel or at an angle of inclination and radially inwards relative to the conveying direction.

A blower may include a fan, a casing including a discharge port and housing the fan, and a nozzle attachable to the discharge port. The nozzle may include a nozzle tube in which air flows, and a plate member disposed within the nozzle tube. A rear end surface of the plate member may be inclined to a flow direction in which air flows within the nozzle tube.