A dual-shaft built-in pump includes a main body, provided with an air inlet and an air outlet; a motor cover, provided with an accommodating cavity having an air inflation vent and an air deflation vent; two valve bodies; a first fan blade, located between the air inflation vent and the air inlet; a second fan blade, located between the air deflation vent and the air outlet; a dual-shaft motor, configured in the accommodating cavity and having an output shaft connected with the first fan blade and the second fan blade; and a rotating member, rotatably provided on the main body and configured to drive either of the two valve bodies thereby opening the air inlet or the air outlet. The pump has simple structure, convenient fabrication and low cost.

A fan comprises a fan housing which includes a shroud having an upstream end that defines an inlet of the fan housing, a motor which is connected to the fan housing, and an impeller which is connected to the motor. The impeller includes an impeller hub and a number of impeller blades which extend radially outwardly from the impeller hub. The shroud includes a cylindrical micro-perforated panel (“MPP”) liner which extends axially from proximate the inlet to proximate the impeller.

A heat exchanger has a first plurality of passages extending in a first direction and to receive a first fluid and a second plurality of passages extending in a second direction, and to receive a second fluid, and the first plurality of passages being formed across a cross-sectional face of the heat exchanger, and there being distinct combined flow cross-sectional areas of the first plurality of passages in different locations across the cross-sectional face of the heat exchanger. A gas turbine engine and a method of forming a heat exchanger are also disclosed.

Recirculation systems for engine intake air are disclosed having a turbocharger compressor with an inlet and an outlet, a recirculation pathway connecting fluid flow from the outlet of the turbocharger compressor to fluid flow into the inlet of the turbocharger compressor, and a recirculation valve assembly controlling fluid flow through the recirculation pathway. The recirculation valve assembly includes an actuator operating a valve coupled to an aspirator assembly that produces vacuum when the fluid flows through the recirculation pathway from the inlet to the outlet and when fluid flows through the recirculation pathway from the outlet to the inlet. Fluid flows through the recirculation pathway from the outlet to the inlet when the turbocharger generates boost. The vacuum generated by the aspirator assembly is in fluid communication with the actuator to move the valve between two or more positions.

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 fan frame assembly includes a first fan frame and a second fan frame. The first fan frame includes a first annular wall part and a plurality of first engagement parts connected to the first annular wall part. The second fan frame includes a second annular wall part and a plurality of second engagement parts connected to the second annular wall part. Each of the first engagement parts has a positioning structure extending along an axial direction of the first annular wall part, and each of the second engagement parts has a positioning structure extending along the axial direction of the first annular wall part. when the first engagement parts and the second engagement parts are respectively engaged with each other, the positioning structures of the second engagement parts are positioned by the positioning structures of the first engagement parts.

A cordless wall fan having a front and rear housing, and safety grills, that plugs directly into a wall socket, and configured to safely provide air movement in the home and white noise near sleeping children, without taking up space on horizontal surfaces and without using potentially dangerous power cords.

An axial flow fan with high-temperature resistance for a ship desulfurization system includes a fan casing, axial flow fan blades, a high-temperature resistant bearing, and a cold water pipe. The axial flow fan blades are coaxially configured at an inner front end of the fan casing, and a rotating shaft is inserted in a middle of the axial flow fan blade. A middle part of the rotating shaft is sleeved with two high-temperature resistant bearings, and outsides of the two high-temperature resistant bearings are fixedly provided with a cruciform axis support. A rear end of the rotating shaft is sleeved with a worm gear, and an upper end of the worm gear is provided with a worm. The worm gear meshes with the worm. The worm gear and the worm are configured inside a lubricating oil casing, and the lubricating oil casing is covered with the insulating layer.

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 fan blade apparatus for use in a high-volume, low-speed fan wherein the fan blade includes a body portion, a leading edge portion and a trailing portion. The fan blade coupled to an electric motor configured to rotate in an intended direction wherein the leading portion of the fan blade is at the forefront of the rotation of the blade. The leading edge portion of the fan blade includes a series of steps extending along the length of the leading edge. The stepped configuration creates turbulent air flow when the electric motor rotates in the intended direction.