A compressor system includes a compressor including a rotary shaft, an impeller, and a casing, a motor including a motor rotor disposed coaxially with the rotary shaft, and a coupling shaft coupling the motor rotor to the rotary shaft. The compressor includes a compressor bearing that rotatably supports the rotary shaft, and a compressor connecting hub that is fixed to the rotary shaft at a position where the compressor connecting hub overlaps the compressor bearing in the axial direction and at a position on an inner side in the radial direction. The coupling shaft is allowed to alleviate misalignment with the compressor connecting hub. The compressor bearing rotatably supports an outer peripheral surface of the compressor connecting hub.

Compressors having multi-speed gearboxes are disclosed. The apparatus comprises: a fluid channel to convey a fluid, a compressor fluidly coupled to the fluid channel, a gearbox operatively coupled to the compressor, the gearbox to control the compressor using a first gear ratio and a second gear ratio different from the first gear ratio to vary a flow rate of fluid in the fluid channel, and clutches to vary the gearbox between the first gear ratio and the second gear ratio.

Compressors having multi-speed gearboxes are disclosed. The apparatus comprises: a fluid channel to convey a fluid, a compressor fluidly coupled to the fluid channel, a gearbox operatively coupled to the compressor, the gearbox to control the compressor using a first gear ratio and a second gear ratio different from the first gear ratio to vary a flow rate of fluid in the fluid channel, and clutches to vary the gearbox between the first gear ratio and the second gear ratio.

A pulley wheel support frame having a ring-shaped support rim having a top surface adapted to support a horizontal pulley wheel, said ring-shaped support rim being coupled, on a bottom side, to an opening adapted to receive a ram or a saddle of a jack; a base; and three or more height-adjustable support columns coupling the base to the ring-shaped support rim, said height-adjustable support columns each being fixable at a plurality of different heights.

A centrifugal compressor is shown, comprising: an impeller; a rotatably mounted diffuser surrounding the impeller; and a driving arrangement configured to drive the impeller and diffuser to rotate in opposing directions.

A fan module including a first body, a second body, a first fan assembly, a power module, and a second fan assembly is provided. The second body is slidably disposed at the first body to form a circulation space together. The first fan assembly is rotatably disposed at the first body and has sliding grooves. The power module is disposed in the first body and connected to the first fan assembly. The second fan assembly is rotatably disposed at the second body and has sliding portions, respectively and slidably disposed in corresponding sliding grooves. The power module is adapted to drive the first and second fan assemblies to rotate relative to the first body. A link module is adapted to drive the first and second bodies to relatively slide along an axial direction, so that the first and second fan assemblies are relatively separated or overlapped along the axial direction.

Discloses is a hermetic blower for high-temperature gas, including: a blower unit in which the inside is hermetic so as to prevent an internal working fluid from being leaked to the outside; a motor unit supplying power to the blower unit; and a magnetic coupling unit connecting the blower unit and the motor unit by using a magnetic force.

The invention relates to a turbo compressor (10), in particular for a fuel cell system (1). The turbo compressor (10) has a first compressor unit (101) and a second compressor unit (102). The first compressor unit (101) comprises a first compressor (11) arranged on a first shaft (14) drivable by a drive unit (20). The second compressor unit (102) comprises a second compressor (12) and an exhaust gas turbine (13). The second compressor (12) and the exhaust gas turbine (13) are arranged on a second shaft (24).

A fluid pump assembly is used in combination with a container having a wall. The pump assembly comprises a first casing disposed outside the container in contact with the wall, a first magnetic assembly mounted to the first casing and operatively associated with a drive motor, a second casing disposed inside the container in contact with the wall, and a second magnetic assembly mounted to the second casing and operatively associated with an propeller. The first magnetic assembly includes a rotatable magnetic drive member drivingly coupled to the drive motor. The magnetic drive member is magnetically coupled to the magnetic driven member through the wall for imparting a rotary driving force of the drive motor to the propeller. Furthermore, the second casing is detachably connected to the second side of the wall of the container solely by magnetic attraction force between the first and second magnetic assemblies.

A controller includes: a control unit configured to calculate a control command value of an opening degree of a solenoid valve to control an opening degree of the solenoid valve; and an acquisition unit configured to acquire an estimated amount and a target amount of a working fluid in a labyrinth chamber, and a rotation speed of a drive shaft. The control unit calculates a final control command value based on a feedback control command value and a feedforward control command value, and controls the solenoid valve, the feedback control command value being calculated based on deviation between the estimated amount and the target amount, the feedforward control command value being used to maintain a rotation speed of a fan constant based on the estimated amount and the rotation speed of the drive shaft.