A well fluid pump has a housing with a stator having a stack of discs through which windings extend. First and second stage modules in a bore of the stator have rotating impellers and non-rotating diffusers. Magnets mounted in each of the stage modules rotate the impellers in response to electromagnetic fields generated by the windings. Anti-rotation members join adjacent ones of the impellers together in each of the stage modules for rotation in unison. A bearing assembly between the first and second stage modules has a rotatable inner portion in engagement with the impellers in the first and second stage modules for causing them to rotate in unison. The bearing assembly has a non-rotating outer portion in engagement with the stator to prevent rotation.

The present disclosure relates to a downhole centrifugal pump system designed to include a diffuser configuration which optimally transfers fluid and builds head pressure at a dead zone between the diffuser and an adjacently upper impeller, the dead zone being defined as an open rotational area between the stationary diffuser and the adjacently upper impeller. The diffuser includes a first side for receiving fluid from a first impeller and a second side for transferring the fluid upwardly to the adjacently upper impeller. The diffuser also includes a plurality of vanes that direct fluid flow from the first side to the second side. Each vane of the diffuser includes an edge at the second side that includes a bulge between a proximal edge and a distal edge on the second side. The bulge advantageously extends upwardly toward the second impeller to reduce the dead zone relative to if the second edge extended linearly from the proximal edge to the distal edge. The structure of the bulge facilitates a head pressure buildup at the dead zone that improves the efficiency of the downhole centrifugal pump system as fluid moves from the diffuser to the adjacently upper impeller.

A boundary layer turbomachine (100) can include a housing (110) defining an interior space (115) and having an inlet opening (112) and an outlet (113) opening to facilitate movement of a fluid through the housing (110). The boundary layer turbomachine (100) can also include a rotor assembly (120) disposed in the rotor chamber (117) and configured to rotate about an axis of rotation (101). The rotor assembly (120) can have a plurality of disks (121) spaced apart along the axis of rotation (101) and defining an interior opening along the axis of rotation (101). The fluid can pass through gaps between the disks (121) and the interior opening as the fluid moves through the housing (110). Corresponding rotor assembly and partition are also provided.

A technique employs a system and methodology for improving sand control in pumps. The technique may be used in centrifugal pumps by providing uniquely constructed rib feature to facilitate sand control and thus reduction of erosion due to sand in the pumped fluid. The improved sand control is useful in centrifugal pumps employed in a variety of oilfield applications, such as in electric submersible pumping systems positioned downhole in a wellbore to pump oil or other fluids. The rib feature may be used in combination with a shield and arranged along diffuser bowl walls or other diffuser walls within sequential pump stages.

A submersible well pump assembly includes a pump driven by a motor. The pump has a number of stages, each stage including a diffuser having an annular diffuser inlet with an annular outer wall. Diffuser passages lead downstream and inward from the diffuser inlet. An impeller has a circumferential outer edge adjacent the outer wall of the diffuser inlet. Notches are formed in the circumferential outer edge, defining a serrated configuration.

A pumping apparatus includes an impeller, an inlet housing and at least one flow guiding element. The impeller is rotationally supported for the guidance of a pumpable medium about an axis of rotation. The inlet housing spans a suction region upstream of the impeller. The at least one flow guiding element is at least partly arranged within the suction region and the flow guiding element is provided to guide the medium flow in the direction of the impeller.

A fluid pump assembly is provided. The pump has a pair of units magnetically coupled to each other. The first unit contains a drive motor and a magnetic assembly. The second unit contains a magnetic assembly and a blade of a propeller/impeller for imparting movement to a fluid. As the first unit is activated by the drive motor, a magnetic flux is created which in turn rotates the magnetic assembly in the second unit, driving the blade.

Turbomachines having close-coupling flow guides (CCFGs) that are designed and configured to closely-couple flow fields of adjacent bladed elements. In some embodiments, the CCFGs may be located in regions extending between the adjacent bladed elements, described herein as coupling avoidance zones, where conventional turbomachine design would suggest no structure should be added. In yet other embodiments, CCFGs are located upstream and/or downstream of rows of blades coupled to the bladed elements, including overlapping one of more of the rows of blades, to improve flow coupling and machine performance. Methods of designing turbomachines to incorporate CCFGs are also provided.

A water pump having direction adjusting mechanism includes: a first housing, formed with an accommodation space and including a first pipe member and a plurality of first fasten parts arranged at a periphery of the first housing; a stator set, including a base plate covered on the first housing, and a coil structure; a partition cover enclosing the coil structure; an impeller set disposed on the partition cover; a rotor set disposed corresponding to the coil structure; and a second housing, engaged at another side of the first housing corresponding to the base plate, and including a second pipe member and a plurality of second fasten parts disposed corresponding to the first fasten parts and arranged at a periphery of the second housing, thereby allowing relative locations of the first pipe member and the second pipe member to be adjusted.

A well pump assembly includes a centrifugal pump having a housing with a cylindrical internal side wall. Upper and lower diffusers are located in the housing. A metal-to-metal seal seals an upper end portion of the lower diffuser to the lower end portion of the upper diffuser. The seal also has an outer surface that frictionally engages the internal side wall of the housing. The seal is energized in response to an axial force exerted between the upper and lower diffusers. One version has a metal seal ring located in mating recesses on the outer walls of the diffusers. Another version includes an inner lip on one of the end portions of the diffusers that extends within and deflects an outer lip on the other of the end portions of the diffusers.