Abstract: A shaft-locating device can include a cylindrical inner collet having an engaging surface on an inner diameter and an outward-facing tapered portion on an outer surface and an outer nut, concentrically located around the inner collet. The outer nut can have an inward-facing tapered portion that engages the outward-facing tapered portion of the inner collet, causing the inner diameter of the inner collet to become smaller, thus engaging, for example, a shaft around which the inner collet is located. In embodiments, a shoulder on the inner collet can prevent axial movement of a shaft-mounted component such as, for example, a bearing.

Abstract: A centrifugal pump has a stationary diffuser with a bore. A thrust bearing is pressed into the diffuser bore and has a curved interior. A thrust runner having a curved exterior is correspondingly and closely received by the thrust bearing interior. The thrust runner is keyed to a shaft and transmits thrust from a rotating impeller to the diffuser via the thrust bearing. The curved surface of the thrust bearing allows for handling of both axial and radial thrust without the need for multiple thrust bearings. The increased surface area of the curved surface in the thrust bearing can also handle higher loads.

Abstract: A shaft-locating device can include a cylindrical inner collet having an engaging surface on an inner diameter and an outward-facing tapered portion on an outer surface and an outer nut, concentrically located around the inner collet. The outer nut can have an inward-facing tapered portion that engages the outward-facing tapered portion of the inner collet, causing the inner diameter of the inner collet to become smaller, thus engaging, for example, a shaft around which the inner collet is located. In embodiments, a shoulder on the inner collet can prevent axial movement of a shaft-mounted component such as, for example, a bearing.

Abstract: A centrifugal pump has impellers that are not connected by a central shaft. More specifically, each of the impellers has a separate hub segment that interlocks with an adjacent hub segment from another impeller. The hub segments are rotated in unison with each other to rotate the impellers.

Abstract: A centrifugal pump has a stationary diffuser with a bore. A thrust bearing is pressed into the diffuser bore and has a curved interior. A thrust runner having a curved exterior is correspondingly and closely received by the thrust bearing interior. The thrust runner is keyed to a shaft and transmits thrust from a rotating impeller to the diffuser via the thrust bearing. The curved surface of the thrust bearing allows for handling of both axial and radial thrust without the need for multiple thrust bearings. The increased surface area of the curved surface in the thrust bearing can also handle higher loads.

Abstract: A centrifugal pump has impellers that are not connected by a central shaft. More specifically, each of the impellers has a separate hub segment that interlocks with an adjacent hub segment from another impeller. The hub segments are rotated in unison with each other to rotate the impellers.

Abstract: An electrical submersible well pump assembly has a motor containing a dielectric lubricant. A seal section is mounted to the motor for reducing pressure differential between the lubricant in the motor and the well bore fluid. The seal section has a head on an end opposite the motor. A pump assembly is mounted to the head of the seal section. An intake is located in the head of the seal section for drawing well bore fluid into the pump assembly.