A system includes a machine; a centrifugal fan, the centrifugal fan having a plurality of centrifugal fan blades and being constructed to generate a cooling airflow for cooling the machine; and an axial flow inducer disposed on the plurality of centrifugal fan blades, wherein the axial flow inducer is constructed generate an axial flow through a central portion of the centrifugal fan.

The present disclosure provides an oil pump including a housing in which a space is formed, a rotor installed to be rotatable in an eccentric position in the housing and having vanes mounted along a circumference direction to be protruded and retracted in a radial direction of the housing, and an inner ring fitted to an inner surface of the housing and rotated along with the rotor when the rotor rotates. The housing is formed of a material harder than the material of the inner ring, and oil for lubrication is provided between the housing and the inner ring.

An air circulator includes an airflow guiding housing and a power assembly. The power assembly is disposed in said airflow guiding housing which sequentially has a purifying chamber and a guiding chamber from bottom to top. The power assembly is operated to drive air to flow into the purifying chamber through an air inlet formed on a bottom peripheral side of the airflow guiding housing radially and deliver along an airflow channel inside the airflow guiding housing. The airflow channel further has an airflow turning portion in the purifying chamber to drive the air in the purifying chamber to turn from a radial direction to and an upward direction to flow into the guiding chamber and discharge out through an air outlet formed on top of the airflow guiding channel upwardly, outwardly and helically.

A blower includes an impeller rotatable about a central axis extending in a vertical direction, a motor on a lower side of the impeller that rotates the impeller about the central axis, and a duct including an airflow passage in an inner space, a suction port through which a fluid flows in the inner space, and an air outlet through which the fluid is discharged from the inner space, the impeller being accommodated in the duct. The impeller includes blades arranged in a circumferential direction, an annular shroud that connects upper portions of the blades and includes an opening opposing the suction port in an axial direction, and a base plate that connects lower portions of the blades and extends in a radial direction. The duct includes a cover covering at least a portion of the blade and an upper portion of the shroud. An inner diameter of the shroud is equal to or larger than an outer diameter of the base plate. The cover includes a projection that projects axially downward from a bottom surface of the cover and is on a radial interior of an inner circumferential surface of the shroud.

The invention relates to mechanical engineering, namely to pumping installations designed for pumping water, water solutions, as well as oil, oil products and the like through the main, process and auxiliary pipelines, and is directed toward providing a single-stage centrifugal pumping unit which demonstrates peak efficiency in non-nominal modes while having a simplified design and being universal in nature. To this end, a single-stage centrifugal pumping unit comprises a centrifugal single-stage double entry pump, an electric drive motor, a coupling, connecting their shafts, a support frame for mounting the pump housing and the electric motor thereon, a housing, which consists of a base and a cover, inlet and outlet manifolds, a rotor with an impeller mounted thereon, the rotor being installed in support bearings, and a volute configured according to the invention in the form of a separate, independent component, and parts of the outside surface thereof, which are intended to be accommodated in cradles provided for this purpose in the cover and the housing, correspond to the shape of the surfaces of said cradles. The impeller and the volute are replaceable as a pair, the parameters of the impeller and the volute in each pair are calculated to provide maximum efficiency while ensuring the requisite feed and pressure. The replaceable volutes are made as an integrated cast component and comprise a baffle separating the fluid flow during the movement.

The present invention is a reversible pump-turbine installation position in a vertical shaft instead of in a conventional underground powerhouse or deep concrete powerhouse. The required plant cavitation coefficient may be achieved by simply boring a vertical shaft to the required depth rather than routing the water flow to and from a deeply buried powerhouse. A pneumatically controlled pressure relief valve may be incorporated into this invention.

A flattened DC brushless motor pump is provided. A first part of a silicon steel sheet unit is attached to a first face of a base plate and a second part of the silicon steel sheet unit is wound with a coil unit so that the coil unit does not overlap the height of a blade member of an impeller so as to reduce the length of a shaft of the impeller, such that the height of a base can be reduced to achieve the advantage of flattening. Thus, the flattened DC brushless motor pump can be hidden in a working machine to reduce the space of use.

Composite suction liners and associated centrifugal pump architectures are described herein which, in some embodiments, provide enhanced operating lifetimes under abrasive slurry conditions. For example, a composite suction liner includes a suction liner substrate and a monolithic cladding metallurgically bonded to a face of the suction liner substrate, the monolithic cladding comprising metal matrix composite including a hard particle phase dispersed in matrix metal or alloy.

A centrifugal pump with a rotor having at least one blade and a method for configuring the profile of a blade is provided. The blade has a profile which is obtained by superposing a symmetric profile with at least one additional profile and a camber line whose blade inlet angle is smaller than 0.

A low-cavitation impeller for a centrifugal pump is provided. The impeller provides a smooth flow path from the inducer section through to the outlet section. Continuous main blades run from a leading edge at the inlet eye to a trailing edge at the impeller outlet, and continuous secondary blades run from a leading edge in the transition region to a trailing edge at the impeller outlet.