A fan motor according to an embodiment of the present invention may include: an impeller a hub connected to a rotary shaft and at least one blade formed on the outer surface of the hub; a shroud surrounding the outer circumference of the impeller; and a coating layer coated on the inner circumferential surface of the shroud. The coating layer may include: a polymer having strength lower than the strength of the blade; and a plurality of beads mixed with the polymer and having strength higher than the strength of the polymer.

A fluid circulating assembly having a rotation axis is provided. The fluid circulating assembly includes a fan impeller including an inlet ring and a rear plate that together define a central fan chamber. The fluid circulating assembly also includes an electrical machine having a rotor assembly, a stator assembly, and at least one bearing assembly. The rotor assembly is coupled to the rear plate such that the electrical machine is located entirely outside the central fan chamber. The rotor assembly includes a hub portion having a radially inner wall that at least partially defines a central opening extending entirely through the electrical machine and oriented about the rotation axis such that the central opening does not include a shaft extending therethrough.

A magnetic coupling suspension pump includes a stator body and a rotor. The stator body includes a magnetic suspension stator assembly and a magnetic coupler stator assembly; the rotor includes a magnetic suspension rotor assembly and a magnetic coupler rotor assembly; the magnetic suspension stator assembly and the magnetic suspension rotor assembly constitute a magnetic suspension assembly, and the magnetic suspension assembly is configured to generate radial uni-polar magnetic poles and magnetic fields arranged along a circumferential direction, resulting in that the rotor suspends; and the magnetic coupler stator assembly and the magnetic coupler rotor assembly constitute a magnetic coupler assembly, and the magnetic coupler assembly is configured to generate radial non-zero even number of periodic magnetic poles and magnetic fields arranged along the circumferential direction, resulting in that the rotor rotates.

Provided is a turbo compressor. The turbo compressor includes a driving shaft, a first impeller, a second impeller, a first shroud, a second shroud, a first-stage outflow passage, and a second-stage outflow passage. Also, the turbo compressor includes a gap adjustment passage that is branched from at least one of the first-stage outflow passage or the second-stage outflow passage to extend to the first shroud.

In centrifugal pumps and, in particular, pumps for transferring fluids containing abrasive particles such as slurry pumps, wear of wetted areas is a major maintenance issue. The invention provides for the protection of internal surfaces vulnerable to wear from such particles by providing means for adjusting and controlling distribution of gland fluid for flushing vulnerable areas. The invention extends to a method and a retrofit kit, but provides primarily for a centrifugal pump assembly comprising an impeller rotatably mounted therein and support means operatively arranged for supporting the impeller from its suction side in sealing relationship with the housing. The sealing means may be mechanically adjustable for substantially even distribution of gland fluid to both axial sides of the impeller in the pump housing.

A turbomachinery according to an embodiment includes an impeller including at least one blade, and a casing for housing the impeller rotatably. A size of a gap between a tip of the blade and an inner surface of the casing during a stop of the impeller is formed non-uniformly over a circumferential direction of the impeller.

An embodiment of the present disclosure discloses a motor assembly including a rotation shaft, an impeller including a hub fastened to the rotation shaft, and a plurality of blades protruding outward from an outer surface of the hub, an inlet body for surrounding an outer circumference of the impeller, and a coating layer coated on an inner surface of the inlet body, wherein at least a portion of the coating layer is ground in a form of powder by friction with the plurality of blades during rotation of the impeller.

A hydraulically powered rotary actuator is described including: a hydraulic linear actuator which is moveable in both directions between a retracted position and an extended position; a clutch device which is operable between an engaged condition and a disengaged condition; and a rotary output member; wherein the linear actuator is coupled to the rotary output member by way of the clutch.

A motor assembly is disclosed. The motor assembly includes a motor having an axis, an impeller having a plurality of wings and configured to connect with the axis, and an impeller cover configured to cover a side surface of the impeller and disposed spaced apart from the impeller by a pre-set distance, and at least one from among the plurality of wings includes a protrusion disposed between the impeller cover and the wing.

The present disclosure describes a system and method for varying pressure from a pressure generator without pressure generator motor speed variations. The system comprises a pressure generator housing, a centrifugal compressor housed within the housing, and at least one impeller blade. The centrifugal compressor is configured to generate a pressurized flow of gas. The pressure generator system includes a pressure adjustment body (e.g., a plate) that is movably attached to and/or within the housing, and an actuator configured to displace the pressure adjustment body with respect to the housing, such that displacement of the pressure adjustment body is configured to regulate pressure of the generated gas flow by varying a gap between the impeller blade and a surface of the pressure adjustment body.