A double curvature blade for a portion of system. The system may include a pump, such as a submersible pump. The pump may include a multiple or single stage pump. The pump may be powered by a selected motor.

A system having a variable diameter impeller device that is operable for reducing an energy consumption of a rotating fluid or gas pump by increasing said impeller diameter as a speed of said rotating fluid or gas pump increases and decreasing the impeller diameter as the speed decreases. An extendable vane mechanism is configured to move along an elongated curved or sloping slot, said movement along the elongated curved or sloping slot is operable for increasing and decreasing a diameter of the impeller device. A spring mechanism having a first end and a second end extends and retracts to dynamically increase or decrease a diameter of the impeller device.

A method for determining mechanical degradation of parts of a centrifugal pump having a fluid inlet, an impeller, and a fluid outlet. The method includes calculating at least one of a wear-ring clearance effect and an impeller wear effect. The wear-ring clearance effect is calculated using measurements of an actual pump flow rate Qp and actual pump power Pwp, calculating an internal flow rate of the pump Qp.sub.Pwp, calculating the mechanical power Pw.sub.Qp that should be used if the pump worked as specified in a theoretical curve, and calculating a difference between a theoretical Head and an internal Head Hp.sub.th?Hp.sub.Pwp to obtain the loss of Head due to the wear-ring clearance. The impeller wear effect is calculated by measuring an actual input pressure p.sub.in, an actual output pressure p.sub.out and an actual pump power Pwp, calculating a theoretical flow rate QpPwp corresponding to the measured mechanical power Pwp, calculating a theoretical Pump Head HpPwp, calculating the actual Pump Head Hp from the actual input pressure p.sub.in, and the actual output pressure p.sub.out and a pumped fluid density, and calculating a difference between the theoretical pump head and the actual pump Head HpPwp?Hp to obtain the loss of head due to the impeller wear.

A centrifugal pump with a cutter mechanism has a toothed cutter auger affixed to an impeller, and a toothed cutter stator affixed to the volute casing. The auger is a rotor cutter preferably profiled radially to match the inlet geometry of the impeller vanes while extending along its central axis towards the pump suction. The auger is preferably radially concentric to the impeller and includes vanes numbered preferably to match the number of vanes on the impeller. The auger is affixed to the impeller, preferably with a lockscrew threaded into a common pump shaft. The radial profile of the auger essentially makes a continuous vane with the impeller, and prevents solids from hanging on the inlet vane tip or center void while providing a smooth flow transition into the impeller.

A slim pump structure includes a case, a rotor assembly, a flow guide plate, a stator assembly and an enclosure member. The case has a first side and a second side. The first side is formed with a pump chamber. A partitioning section partitions the pump chamber into a first chamber and a second chamber. A pivotal section upward extends from the second chamber. A center of the pivotal section is formed with a bearing hole. The second side is recessed to form a cavity corresponding to the pivotal section. Multiple axial ribs are formed on a circumference of the cavity at intervals. Each two adjacent ribs define a gap therebetween. The rotor assembly is received in the second chamber. The flow guide plate covers the second chamber so as to uncommunicate the second chamber from the first chamber. The stator assembly is correspondingly disposed on the case.

A magnetically levitated rotor includes a magnetically effective core and a sheathing made of a thermoplastically processible fluoropolymer. The sheathing completely encloses the magnetically effective core. The magnetically effective core comprises at least one permanent magnet and each permanent magnet has a metallic coating for protection against acidic or chemically aggressive substances. A plastic coating is disposed between the metallic coating and the sheathing, and includes a polymer belonging to the family of parylenes.

A centrifugal pump includes a rotating blade member including an impeller member and a rotor magnet, a main body casing accommodating the rotating blade member, a coil portion that rotates the rotating blade member is located on a periphery of the rotor magnet, and an axial member associated with the main body casing. The rotating blade member pivots around the axial member. The axial member includes an end portion at axial rotor magnet side, and is fixed at the end portion. The main body casing forms a fluid introducing passage, and is associated with a blade casing accommodating the rotating blade member. An end portion of a bearing portion at an axial fluid introducing passage side is protruded such that the end portion of the bearing portion protrudes from an inner periphery opening portion of the blade casing into the fluid introducing passage.

Fluid pumps with integrated electric motors may be implemented by a variety of techniques. In one example embodiment, a pump may include an electric motor with a magnetically driven impeller/rotor that eliminates the need for a mechanical roller bearing system and shaft seals, which are a common cause of failure in fluid pump systems.

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 monolithic impeller includes a gear opening defined by a cylindrical member and an inner surface being splined for receiving a gear shaft and defining an impeller axis. A plurality of blades each include an arcuate configuration extending outwardly relative to the impeller axis. The blades include a proximal end disposed proximate the cylindrical member and a distal end disposed radially outwardly from the cylindrical member. A cover member extends radially outwardly to the distal end of the plurality of blades and defines a fluid inlet that is concentric with the impeller axis. A hub member is spaced from the cover member by the blades extending radially outwardly from the cylindrical member. The proximal end of the blades extend radially inwardly of the fluid inlet and the distal end of the blades terminating at a common concentric diameter as an outermost portion of the cover member and the hub member.