A rotation mechanism includes a casing with an upper half portion and a lower half portion; and an internal unit disposed in the casing with a rotor rotating around an axis thereof. Additionally, a bearing portion rotatably supports the rotor, and an annular seal portion seals a gap surrounding a circumferential surface of the rotor. An axial movement restricting portion includes a fitting concave portion on one of the casing and the internal unit, and a fitting convex portion to be fitted into the fitting concave portion as a pair, which restricts relative movement between the casing and the internal unit in a direction of axis. A tapered surface is formed on the fitting concave portion and the fitting convex portion and a width thereof in the direction of axis increases toward an inner circumferential side in a radial direction.

A method and apparatus according to which an output of a power generation system is controlled. In one embodiment, the power generation system includes a turbine and a feedback control system. The turbine includes a rotor to which a first portion of a power fluid is communicated, the first portion imparting torque to the rotor; a shaft to which the rotor is connected; a shroud extending circumferentially about the rotor and the shaft; and a bypass gap between the rotor and the shroud, through which a second portion of the power fluid is communicated. The feedback control system axially displaces the shroud relative to the rotor, thereby adjusting the size of the bypass gap and, consequently, the ratio of the first portion relative to the second portion.

A coupling pin for use in a pump housing, the pump housing including an outer casing and an inner pump liner, the coupling pin being suitable for locating the liner and casing relative to one another, the coupling pin including a shank and a head at one end of the shank. The head includes a cammed surface thereon which is adapted to co-operate with a follower on the liner, and a locating section on a remote or terminal end of the head which is adapted to be positioned against a seat in the outer casing when fitted. The arrangement is such that rotation of the coupling pin causes the follower to track along the cammed surface so as to cause relative movement between the outer casing and the inner pump liner.

A rotor assembly that includes a shaft and an impeller and/or a rotor core. The shaft is secured within a bore in the impeller and/or the rotor core by an adhesive such that the concentricity of the shaft is smaller than that of the bore. A method of manufacturing the rotor assembly is also described.

A magnetically driven centrifugal pump has a pump case, an open vane impeller in the pump case, a stuffing box including a stuffing box outer being fixed relative to the pump case and a stuffing box inner threadedly engaged with the stuffing box outer, and a rotor axially fixed and rotatably mounted in the stuffing box inner. Bushings are arranged between the rotor and the stuffing box inner. A drive is fixed relative to the pump case and includes a drive output extending into the rotor. There is a magnetic coupling between the rotor and the drive and a canister fixed to the stuffing box and extending through the magnetic coupling to isolate the rotor from the drive. A rub ring closes the end of the stuffing box inner and constrains the drive output from damaging the cannister under catastrophic bearing failure.

A rotor assembly that includes a shaft and an impeller and/or a rotor core. The shaft is secured within a bore in the impeller and/or the rotor core by an adhesive such that the concentricity of the shaft is smaller than that of the bore. A method of manufacturing the rotor assembly is also described.

An object is to provide a method of manufacturing a supercharger that can promptly and easily form an abradable layer in a supercharger. A method of manufacturing a supercharger is a method of manufacturing a supercharger including a turbine configured to rotationally drive, and a compressor having an impeller configured to rotate according to rotational force of the turbine and a housing (10) configured to store the impeller, and the method includes a process of applying coating of an abradable material which is to form an abradable layer (20) when being solidified, only to a predetermined range on a surface of the housing (10) via which the impeller and the housing (10) face.

The present disclosure relates to impellers with removable and replaceable vanes, and methods of constructing such impellers. According to aspects of the present disclosure, a plurality of impeller back plates are provided with differently configured slots to receive removable vanes. In addition, a plurality of differently configured vanes are disclosed which may be connected to the plurality of impeller back plates. As a result, the desired performance characteristics of a pump based upon end use applications may be efficiently and quickly achieved by combining appropriately configured vanes and back plate into a desired impeller providing the desired characteristics, together with a particular pump casing and motor.

A centrifugal compressor includes a casing, a first impeller, a motor, a cooling medium delivery structure, a shaft, and a first bearing. The casing has a first inlet portion and a first outlet portion. The first impeller is attached to the shaft and disposed between the first inlet portion and the first outlet portion. A first axial gap exists between the first impeller and the casing. The shaft is rotatably supported and axially moveable with respect to the casing by the first bearing. The motor is arranged inside the casing to rotate the shaft. The cooling medium delivery structure is configured to vary a supply of a cooling medium to the casing.

An impeller clearance control apparatus for a centrifugal compressor includes a sensor and a controller. The controller controls a supply of a cooling medium to the casing based on a value detected by the sensor.

The invention relates to a centrifugal pump, in particular a waste water submersible pump having an impeller (1), of which the end face facing the pump intake opening is open and only the end face of the impeller facing away from the intake opening (8) is covered by a circular coaxial impeller hub (2), on which the curved vanes (3, 4) are fastened, and in particular molded on, wherein the base plate (7) having the intake opening (8) facing the impeller (1) or at least one segment (7a) of the base plate is mounted so as to be movable against spring pressure (20) in such a way that the distance thereof from the impeller (1) and thus from the impeller vanes (3, 4) changes.