A pump device (10) includes a housing (30) including a blood inflow port (38) through which blood flows in, and having a fixed-side repulsive magnet (44) disposed in an annular manner; and an impeller (14) that is rotatably housed inside the housing (30), and having a movable-side repulsive magnet (56) disposed in an annular manner. The fixed-side repulsive magnet (44) is disposed in a position offset toward the blood inflow port (38) side relative to the movable-side repulsive magnet (56). In the fixed-side repulsive magnet (44) and the movable-side repulsive magnet (56), a fixed-side repulsive surface (44a) and a movable-side repulsive surface (56a) adjacent to each other have the same polarity.

A blood pump includes an impeller; a drive shaft coupled to the impeller and configured to rotate with the impeller; a motor configured to drive the impeller; and a bearing assembly disposed adjacent the motor and configured to receive an end of the drive shaft. The bearing assembly includes a bearing, where the end of the drive shaft is at least partially rounded, and the where the bearing includes a concave depression defined in a first side of the bearing, where the depression is configured to receive the end of the drive shaft. The bearing assembly may include a lubricant chamber configured to hold a lubricant.

A downhole-type system includes a rotatable rotor, a magnetic thrust bearing coupled to the rotor, and a mechanical thrust bearing coupled to the rotor. The magnetic thrust bearing is configured to support a first portion of an axial load of the rotor during rotor rotation, and the mechanical thrust bearing is configured to support a second portion of the axial load of the rotor during rotor rotation.

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.

Pumps are provided for transferring fluids between tanks and other types of vessels. The pumps include a rotating impeller that pumps the fluid, and an electric motor that imparts rotation to the impeller. The impeller is mounted for rotation on a shaft by way of a bushing. The bushing is made of a material suitable for contact with food products intended for human consumption. Also, the material can withstand the elevated temperatures that arise in the bushing when the pump is run in a dry condition, i.e., without any fluid passing through the pump.

A rotary assembly for a centrifugal pump includes a housing, an impeller, a first opening formed in one of the housing or the impeller, a first bushing disposed in the first opening, and a first shaft projection projecting axially from one of the housing or the impeller. The first bushing extends annularly around a central opening thereof and is formed from an elastomeric material. The first shaft projection is received within the central opening of the first bushing. One of the first shaft projection or the first bushing is configured to rotate relative to the other of the first shaft projection or the first bushing during operation of the centrifugal pump.

A fluid rotor is configured to move or be rotated by a working fluid. A fluid stator surrounds the fluid rotor. The fluid stator is spaced from the fluid rotor and defines a first annular fluid gap in-between that is in fluid communication with an outside environment exterior the downhole-type pump. A radial magnetic bearing includes a first portion coupled to the fluid rotor and a second portion coupled to the fluid stator. The first portion is spaced from the second portion defining a second annular fluid gap in-between that is in fluid communication with the outside environment exterior the downhole-type pump.

A pump drive for an extracorporeal blood pumping system including an adjustable drive magnet. The pump drive may be coupled to a blood pump which includes a pump impeller. The pump drive may include a stepper motor for dynamically adjusting the position of the drive magnet. The position of the drive magnet may be varied to vary the distance between the drive magnet and an impeller magnet of the pump impeller. Adjusting the position of the drive magnet may include dynamically adjusting the drive magnet and may include axially moving the drive magnet to thereby vary a magnetic attraction force between the drive magnet and the impeller magnet which may thereby minimize forces acting on one or more bearings of a pump impeller.

A centrifugal pump includes: a rotating blade member including an impeller member and a rotor magnet associated with the impeller member, a main body casing in which the rotating blade member is accommodated, a coil portion that rotates the rotating blade member, wherein the coil portion is located on a periphery of the rotor magnet, and an axial member which is associated with the main body casing, wherein the rotating blade member pivots around the axial member. A clearance, in which the rotor magnet is allowed to move, is provided between the blade member and the rotor magnet.

A turbomolecular pump is provided. In one arrangement, a stator stack and rotor stack have corresponding conical or frustum shapes that allow for adjusting the clearance between the stator vanes and rotor vanes of the pump to provide adjustable compression ratios and/or to adjust clearances. In another arrangement, the actuator or drive mechanism of the pump is formed from coils attached to the upper stage of rotor vanes which are controlled to interact with a plurality of stationary magnets attached to the housing of the pump to rotate the stator stack. In another arrangement, a control system of the pump utilizes the coils of the rotor drive to dynamically balance the pump during operation.