A rotation shaft supporting structure for an electric supercharger includes a rotation shaft that supports a compressor wheel, an electric motor including a motor rotator securely installed to the rotation shaft, and a stator for applying torque to the motor rotator. The supporting structure further includes a bearing provided on a bearing side end of the rotation shaft, which is adjacent to the compressor wheel, to support the rotation shaft, and a damper unit for absorbing shaft vibration of the rotation shaft. The compressor wheel is a wheel of a supercharging side, and the damper unit is provided at a shaft end on an opposite side to the bearing side.

A rotation shaft supporting structure for an electric supercharger includes a rotation shaft that supports a compressor wheel, an electric motor including a motor rotator securely installed to the rotation shaft, and a stator for applying torque to the motor rotator. The supporting structure further includes a bearing provided on a bearing side end of the rotation shaft, which is adjacent to the compressor wheel, to support the rotation shaft, and a damper unit for absorbing shaft vibration of the rotation shaft. The compressor wheel is a wheel of a supercharging side, and the damper unit is provided at a shaft end on an opposite side to the bearing side.

A centrifugal electric submersible pump (ESP). The centrifugal ESP comprises a rotatable shaft, a series of impellers stacked on the rotatable shaft, each impeller comprising a hub secured to the rotatable shaft by a key, the series of impellers comprising an uppermost impeller and a lowermost impeller, a flanged sleeve keyed to the rotatable shaft below the lowermost impeller, and a seal disposed between the lowermost impeller and the flanged sleeve.

The present invention relates to a motor pump (10) free from bearings, cooler and mechanical sealing, more specifically to a hydraulic motor pump, which comprises a housing (14) defined by a first chamber (19) isolated from fluids and a second chamber (17). In the second chamber (17) there is an integral rotor/turbine assembly (11), the rotor and the turbine being induced by magnetic forces of a stator (12), which is located in the first chamber (19). A fluid inlet (15) and a fluid outlet (16) are located at the same end of the motor pump (10), so that most of the fluid impelled into the motor pump (10) is guided directly to the outlet (16) with the aid of a fluid guide (20) located at the front end (24) of the rotor/turbine assembly (11), enabling an increase in the flowrate inside the motor pump (10), thus increasing the yield thereof.

A synchronous electric motor for operating a pump includes a motor body, a stator and a rotor coupled to an impeller of the pump. The motor also comprises a cylindrical element that extends towards the inside of the motor body from one of its outer walls so as to define a first cylindrical cavity open to the outside to insert inside the rotor, wherein the rotor has a circular cross section essentially corresponding to the inner section of the cylindrical element so that the rotor is in contact with the cylindrical element and then there is a friction between the rotor and the cylindrical element when the rotor rotates, and the rotor is shaftless and axially and directly coupled to the impeller of the pump.

A synchronous electric motor for operating a pump includes a motor body, a stator and a rotor coupled to an impeller of the pump. The motor also comprises a cylindrical element that extends towards the inside of the motor body from one of its outer walls so as to define a first cylindrical cavity open to the outside to insert inside the rotor, wherein the rotor has a circular cross section essentially corresponding to the inner section of the cylindrical element so that the rotor is in contact with the cylindrical element and then there is a friction between the rotor and the cylindrical element when the rotor rotates, and the rotor is shaftless and axially and directly coupled to the impeller of the pump.

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 canister under catastrophic bearing failure.

A fluid dynamic-pressure bearing set for a fan includes a casing having a hollow inner space; a seat integrally formed with the casing; the seat including a lower plate, and a hollow cylinder extended from the lower plate of the seat; a friction sheet being installed on the lower plate of the seat; a bearing being installed around an inner periphery of the cylinder; a motor coil installed around an outer periphery of the cylinder; a rotary shaft installed in an axial center of the bearing; and a fan blade set installed at an upper portion of the rotary shaft; and wherein a recess is formed on the lower plate of the seat and does not penetrate the bottom of the seat; and the recess is positioned between the friction sheet and an inner wall of the seat.

A fluid dynamic-pressure bearing set for a fan includes a casing having a hollow inner space; a seat integrally formed with the casing; the seat including a lower plate, and a hollow cylinder extended from the lower plate of the seat; a friction sheet being installed on the lower plate of the seat; a bearing being installed around an inner periphery of the cylinder; a motor coil installed around an outer periphery of the cylinder; a rotary shaft installed in an axial center of the bearing; and a fan blade set installed at an upper portion of the rotary shaft; and wherein a recess is formed on the lower plate of the seat and does not penetrate the bottom of the seat; and the recess is positioned between the friction sheet and an inner wall of the seat.

A compressor device includes a motor cooling system that provides a first flow of a first fluid through a housing for cooling a motor. The motor cooling system includes a first fluid flow section at a first axial position. The first fluid flow section extends in a downstream direction radially with respect to the axis of rotation. Also, the device includes a bearing cooling system that provides a second flow of a second fluid through the housing for cooling the bearing. The bearing cooling system includes a second flow section at a second axial position that is spaced apart axially from the first axial position. The second flow section extends in a downstream direction radially with respect to the axis of rotation. The first flow section and the second flow section are disposed in a heat exchanger arrangement configured to transfer heat between the second fluid and the first fluid.