There is disclosed a gas turbine engine including a bearing housing having at least two bearings axially spaced from one another relative to a central axis. The bearing housing includes an axially deformable bellows between the bearings configured to permit axial relative movement of the bearings. A method of operating a bearing assembly is also disclosed.

There is disclosed a gas turbine engine including a bearing housing having at least two bearings axially spaced from one another relative to a central axis. The bearing housing includes an axially deformable bellows between the bearings configured to permit axial relative movement of the bearings. A method of operating a bearing assembly is also disclosed.

An electric water pump having a motor with an axially moveable rotor unit. A rotary pump member is fixed for axial movement with the rotor unit to vary its position within a pump chamber so as to vary the flow rate through the pump chamber.

An electric water pump having a motor with an axially moveable rotor unit. A rotary pump member is fixed for axial movement with the rotor unit to vary its position within a pump chamber so as to vary the flow rate through the pump chamber.

A parameter of a magnetic bearing supporting a rotor in operation within a stator of the downhole-type rotating machine is measured. A speed of the rotor is controlled based on the measured parameter.

A hydrodynamic heater pump may include a housing and a stator fixed relative to the housing. A rotor may be coaxially aligned with and positioned adjacent the stator. The rotor and the stator define an interior region of a hydrodynamic chamber operable for heating a fluid present within the interior region of the hydrodynamic chamber. The rotor may be attached to a drive shaft for concurrent rotation therewith. The rotor may be moved axially along an axis of rotation of the drive shaft between a pumping mode position and a heating mode position. The rotor may be located a first distance from the stator when arranged in the heating mode position and a second distance from the stator when arranged in the pumping mode position. The second distance may be greater than the first distance.

A pump is provided which includes a rotating element, and a volute housing having a fluid inlet and a fluid outlet. In operational state, the rotating element rotates, drawing fluid through the fluid inlet of the volute housing and expelling the fluid at a higher pressure through the fluid outlet. Further, the pump includes a bypass mechanism integrated, at least in part, within the volute housing and exposing in nonoperational state of the pump, a bypass path through, at least in part, the volute housing that allows the fluid to pass from the fluid inlet to the fluid outlet of the pump.

A pump is provided which includes a rotating element, and a volute housing having a fluid inlet and a fluid outlet. In operational state, the rotating element rotates, drawing fluid through the fluid inlet of the volute housing and expelling the fluid at a higher pressure through the fluid outlet. Further, the pump includes a bypass mechanism integrated, at least in part, within the volute housing and exposing in nonoperational state of the pump, a bypass path through, at least in part, the volute housing that allows the fluid to pass from the fluid inlet to the fluid outlet of the pump.

Technologies are described for devices and methods for adjusting a position of impellers within a bowl assembly. The devices may comprise an adjuster at the second end of a spacer coupling. The adjuster may include an adjuster sleeve. The adjuster sleeve may be a cylindrical sleeve. The adjuster sleeve may be threaded on an internal side. The adjuster sleeve may be spaced from the driven hub so that the adjuster sleeve can rotate around a driven shaft. The adjuster sleeve may threadedly mate and engage with an externally threaded first end of the driven shaft when the adjuster sleeve is rotated. The rotation of the adjuster sleeve may adjust a position of the driven shaft with respect to the driven hub and may thereby adjust a position of an impeller attached to a second end of the driven shaft with respect to a stationary bowl.

Technologies are described for devices and methods for adjusting a position of impellers within a bowl assembly. The devices may comprise an adjuster at the second end of a spacer coupling. The adjuster may include an adjuster sleeve. The adjuster sleeve may be a cylindrical sleeve. The adjuster sleeve may be threaded on an internal side. The adjuster sleeve may be spaced from the driven hub so that the adjuster sleeve can rotate around a driven shaft. The adjuster sleeve may threadedly mate and engage with an externally threaded first end of the driven shaft when the adjuster sleeve is rotated. The rotation of the adjuster sleeve may adjust a position of the driven shaft with respect to the driven hub and may thereby adjust a position of an impeller attached to a second end of the driven shaft with respect to a stationary bowl.