A pump with a wear ring includes at least one impeller; at least one diffuser; and at least one wear ring positioned between the at least one impeller and the at least one diffuser. The wear ring is removably coupled to the diffuser and includes radially extending clutch members. The clutch members are configured to hold a portion of the at least one diffuser.

A pump assembly (1) includes a rotor shaft, a pump base (3), a pump housing (5), a motor housing (9) enclosing a motor for driving the rotor shaft, and a motor stool (7) that includes a motor coupling portion (13) and a pump coupling portion (15). The pump housing encloses one or more impeller stages (10) arranged between the motor stool and the pump base. The motor stool is clamped to the pump base by at least two tie rods (17). The motor stool includes at least two fixation protrusions (39) each having a protrusion end (41) in the motor coupling portion. Each of the tie rods is fixed to the motor stool by way of a fastener (37) at least partially extending through one of the fixation protrusions. Each fastener is only accessible when the motor housing is decoupled from the motor coupling portion of the motor stool.

A multiple channel diffuser having an annular shaped radial inlet and a tangential outlet, and a plurality of separated diffuser channels connecting the radial inlet to the tangential outlet such that a flow does not mix. A tap-off passage can be used to provide flow to a gas generator or a preburner. A cross-over passage can also be used to provide flow from a first diffuser to a second diffuser.

Systems and devices for cooling servers are provided. In one aspect, a cooling device includes a first axial pump including a body having an impeller, the first axial pump coupled to a first pump housing, the first axial pump housing coupled to a chassis, a rack, a row of racks, or one or more racks of the row of racks that are housing one or more servers. The cooling device also includes an inlet pipe coupled to an inlet of the first pump housing, the inlet pipe supplying cooling fluid to the first axial pump. The cooling device also includes an outlet pipe having an outlet coupled to the first pump housing, the outlet pipe receiving the cooling fluid from the first axial pump.

A submersible well pump has diffusers fixed within the housing and an impeller mounted between each of the diffusers. Spacer sleeves located between and in abutment with hubs of adjacent ones of the impellers define a stack wherein the impellers rotate in unison with the shaft and are axially movable in unison with each other relative to the shaft. A stop shoulder on the shaft abuts the lower end of the stack. A spring mounted in compression around the shaft in abutment with the upper end of the stack urges the lower end of the stack against the stop shoulder. Upward movement of the stack requires further compression of the spring. Up thrust and down thrust gaps between each impeller and adjacent diffusers prevent up thrust and down thrust from being transferred to any of the diffusers.

A centrifugal pump assembly includes a pump head, a pump base defining a pump inlet and a pump outlet, a fluid outlet channel from the pump head to the pump outlet, impellers, defining an impeller fluid channel between an impeller inlet and outlet and connected with one of rotor shaft segments including a positive fit coupling for torque transfer between at least two rotor shaft segments, and one or more pump stage housing segments arranged between the pump base and the pump head. The pump stage housing segments have a structure defining a guide passage for receiving pumped fluid from the impeller outlet of the impellers and for guiding pumped fluid to the impeller inlet of another one of the impellers or to the pump head. The pump stage housing segments each have a structure defining at least a part of a wall section of the fluid outlet channel.

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.

A pump assembly with improved sealing includes an outer housing and an insert arranged therein. The insert includes a rotatable shaft and at least two pressure stages. Each pressure stage has a housing, an impeller, and a seal that separates a first pressure chamber from a second pressure chamber. At least one of the pressure stage housings includes a first casing part having a first region having an enlarged inner diameter and a second region having a reduced inner diameter, and a second casing part having at least one first portion having a reduced outer diameter and a second portion having an enlarged outer diameter. The first region surrounds the first portion and at least partially surrounds the second portion, such that an annular chamber is formed between the first casing part and the second part, with the annular chamber being connected to the second pressure chamber.

A pumping module is positionable within a pump housing for pumping fluid into a wellbore. The pumping module includes a cylindrical housing with an inlet end and an outlet end, an inlet cap positioned on the inlet end of the cylindrical housing and including an inlet formed through the inlet cap, and an outlet cap positioned on the outlet end of the cylindrical housing and including an outlet formed through the outlet cap. A shaft is rotatable with respect to the cylindrical housing, and a rotor is positioned within the cylindrical housing and rotatable by the shaft to push fluid through the cylindrical housing.

A sensor assembly (2) is configured to perform fault detection in a pump assembly that includes an electric motor (70) and a fluid pump (30). The sensor assembly (2) includes a housing (4) configured to be mechanically attached to the pump (30) and configured to be attached into a bore provided in the pump (30). One or more vibration sensing element(s) (16) is/are arranged in the housing (4). The sensor assembly (2) includes a calculation unit (84) configured to receive sensor signals (V.sub.1, V.sub.2, V.sub.3) from the vibration sensing element(s) (16) and perform calculations and thereby detect motor bearing faults and cavitation.