An electric centrifugal pump having a motor housing, a pump head, a containment shell, and a rotor assembly consisting of a pump impeller and a permanent magnet rotor, wherein the pump head with the containment shell defines a wet chamber, in which the rotor assembly is arranged rotationally around a longitudinal motor axis, the containment shell with the motor housing defines a dry chamber, in which a wound stator is arranged, and the permanent magnet rotor is arranged within the stator and a hollow-cylindrical region of the containment shell. Particle accumulations in the region between the containment shell and the permanent magnet rotor cannot occur or can only occur to a very minor extent and that the consequences of impurities in the wet chamber are reduced in order to prevent premature wear or a blockage of the centrifugal pump.

A turbomachine includes a housing having an inlet and an outlet. A shaft is rotationally disposed in the housing. The shaft is rotatable about a longitudinal axis. An impeller is coupled to the shaft between the inlet and the outlet and rotates with the shaft. The impeller includes a single impeller inlet and an impeller outlet, a first set of vanes disposed on a first side of the impeller, and a second set of vanes disposed on a second side of the impeller. A passage is formed through a thickness of the impeller. The passage facilitates transmission of fluid from the first side of the impeller to the second side of the impeller such that fluid is supplied to the first set of vanes and the second set of vanes via the single impeller inlet. Transmission of fluid through the impeller reduces net axial thrust imparted to at least one of the impeller and the shaft.

A washing machine appliance and pumps therefore are provided. In one example aspect, a drain pump for a washing machine appliance includes features for improving pump performance and sand and debris management. The drain pump includes a pump housing and a pump body defining a pump chamber in which an impeller having a disk and blades is rotatably mounted. The pump body has a base defining a pump body recess. An outer rim of the base defines an outer periphery of the pump body recess. The disk is spaced from the outer rim so that sand and debris can be flushed from beneath the impeller. A sloped surface of the outer rim also facilitates removal of sand and debris from beneath the impeller. A labyrinth is defined beneath blades of the impeller to prevent sand and debris from entering an area between a seal and a shaft of the impeller.

A turbomachine includes a housing having an inlet and an outlet. A shaft is rotationally disposed in the housing. The shaft is rotatable about a longitudinal axis. An impeller is coupled to the shaft between the inlet and the outlet and rotates with the shaft. The impeller includes a single impeller inlet and an impeller outlet, a first set of vanes disposed on a first side of the impeller, and a second set of vanes disposed on a second side of the impeller. A passage is formed through a thickness of the impeller. The passage facilitates transmission of fluid from the first side of the impeller to the second side of the impeller such that fluid is supplied to the first set of vanes and the second set of vanes via the single impeller inlet. Transmission of fluid through the impeller reduces net axial thrust imparted to at least one of the impeller and the shaft.

An open impeller for a submergible pump for pumping abrasive fluids. The impeller has a cover plate, a hub and at least two spirally swept blades, each blade having a leading edge, a trailing edge, and a lower edge extending from the leading edge to the trailing edge and separating the suction and pressure sides of the blade. At least one blade includes a winglet at the lower edge projecting from the suction side, located radially outside an inner radius of the impeller, and extending circumferentially to the trailing edge at the suction side at a maximum radius of the impeller. The lower edge and winglet lower wear surface are configured to be located opposite of and facing a pump wear plate. The inner radius is equal to the largest of the maximum radius of the impeller multiplied by 0.6, and an inlet radius of the impeller multiplied by 1.2.

A double-sided impeller with a dual intake fluid housing apparatus is designed to suction an extraneous fluid through both a first intake and a second intake, where gases trapped in the fluid housing may escape and mitigate cavitation. The apparatus includes a fluid impeller, a fluid housing, an output volute, and a shaft. The fluid impeller is double-sided with a first plurality of blades and a second plurality of blades respectively adjacent to the first intake and the second intake. The fluid housing surrounds the fluid impeller and in fluid communication with the extraneous fluid. The shaft is rotationally coupled with the fluid impeller such that torque applied to the shaft applies torque to the fluid impeller. The output volute is in fluid communication with the fluid housing and tangentially positioned such that the motion of the extraneous fluid in the fluid housing is directed toward the output volute.

An electric centrifugal pump having a motor housing, a pump head, a containment shell, and a rotor assembly consisting of a pump impeller and a permanent magnet rotor, wherein the pump head with the containment shell defines a wet chamber, in which the rotor assembly is arranged rotationally around a longitudinal motor axis, the containment shell with the motor housing defines a dry chamber, in which a wound stator is arranged, and the permanent magnet rotor is arranged within the stator and a hollow-cylindrical region of the containment shell. Particle accumulations in the region between the containment shell and the permanent magnet rotor cannot occur or can only occur to a very minor extent and that the consequences of impurities in the wet chamber are reduced in order to prevent premature wear or a blockage of the centrifugal pump.

A dual stage grinder pump (10) includes a housing (12) with a liquid inlet (20) and an outlet (26). An impeller (36) includes first impeller vanes (52) on a first axial side, and second impeller vanes (60) on a second axial side. A grinder (40) operates to reduce the size of suspended solids in the liquid that enters the pump inlet. Liquid passes from the inlet to a first fluid passage (30) and is acted upon by first vanes of the impeller in a first stage, and then passes through a second fluid passage (72). Liquid is acted upon by the second vanes of the impeller in a second stage and is passed through a third fluid passage (88) to the outlet.

A washing machine appliance and pumps therefore are provided. In one example aspect, a drain pump for a washing machine appliance includes features for improving pump performance and sand and debris management. The drain pump includes a pump housing and a pump body defining a pump chamber in which an impeller having a disk and blades is rotatably mounted. The pump body has a base defining a pump body recess. An outer rim of the base defines an outer periphery of the pump body recess. The disk is spaced from the outer rim so that sand and debris can be flushed from beneath the impeller. A sloped surface of the outer rim also facilitates removal of sand and debris from beneath the impeller. A labyrinth is defined beneath blades of the impeller to prevent sand and debris from entering an area between a seal and a shaft of the impeller.

A turbopump is formed from a metal additive manufacturing process in which both the housing and the impeller are formed as a single piece with the impeller trapped within the single piece housing. The impeller is formed with an axial bore and a shaft is secured by a tie bolt on one end to secure forward and aft bearings within the housing after the impeller and housing have been formed.