A diffuser system for a centrifugal compressor is provided. The diffuser system includes a nozzle base plate that defines a diffuser gap, support blocks, and a drive ring rotatable relative to the support blocks. The drive ring includes cam tracks and bearing assemblies positioned proximate an outer circumference of the drive ring. The diffuser system further includes drive pins extending through the support blocks and the nozzle base plate. The first end of each drive pin includes a cam follower mounted into a cam track on the drive ring. The second end of each drive pin is coupled to a diffuser ring. Rotation of the drive ring causes axial movement of the drive pins by movement of the cam followers in the cam tracks. This results in movement of the diffuser ring to control fluid flow through the diffuser gap.

A controllable Pitot device uses a Pitot nozzle supported by a Pitot nozzle holder for pumping fluid flowing in a first direction or in a second direction flowing opposite the first direction. The Pitot nozzle has one ingestion inlet pivotable to ingest fluid from either direction. Ingested fluid impinges on an obstacle interior to the Pitot nozzle which is disposed opposite the ingestion inlet to create a zone of fluid at stagnation pressure. Stagnation pressure pumps fluid via the interior of the Pitot nozzle through one of two openings for discharging pumped fluid out of a discharge outlet supported by the nozzle holder, to the exterior of the Pitot device. The nozzle holder can be a support structure or an embedded support operative with a rotating fluid machine.

A controllable Pitot device uses a Pitot nozzle supported by a Pitot nozzle holder for pumping fluid flowing in a first direction or in a second direction flowing opposite the first direction. The Pitot nozzle has one ingestion inlet pivotable to ingest fluid from either direction. Ingested fluid impinges on an obstacle interior to the Pitot nozzle which is disposed opposite the ingestion inlet to create a zone of fluid at stagnation pressure. Stagnation pressure pumps fluid via the interior of the Pitot nozzle through one of two openings for discharging pumped fluid out of a discharge outlet supported by the nozzle holder, to the exterior of the Pitot device. The nozzle holder can be a support structure or an embedded support operative with a rotating fluid machine.

The disclosure relates to a centrifugal compressor and a diffuser; the diffuser includes a pressure drive mechanism, a first diffuser part, a second diffuser part and a movable diffuser part movable diffuser part being connected with the pressure drive mechanism and movably arranged on one of the first diffuser part and the second diffuser part; moreover, the movable diffuser part gets close to or leaves away from the other one of the first diffuser part and the second diffuser parts under the action of a pressure medium in the pressure drive mechanism so as to adjust a width of a pressure diffusion flow channel and prevent adverse phenomena such as gas flow stall and surging.

Centrifugal pump systems and related methods are disclosed herein that can shift a best efficiency point of a pump based on one or more operating conditions to operate more efficiently across and/or adjust to a broader range of conditions. Pumps provided for herein can include an adaptive volute in which a geometry of the volute can be adjusted to shift an operating efficiency of the pump. In some embodiments, a height or radial dimension of the adaptive volute can be adjusted based on one or more operating condition. A geometry of the adaptive volute can be adjusted during operation of the pump and/or while an impeller is disposed within the volute. In some embodiments, a first and second collar can be disposed within the adaptive volute. Rotation of the first component can move the second component axially, which can expand or contract an axial dimension of the adaptive volute.

A compressor control system includes: a compressor; an inlet guide vane (IGV) arranged at an inlet of the compressor, and configured to adjust opening of the inlet based on a supplementary surge control signal or a performance control signal; an anti-surge valve (ASV) connected to an outlet of the compressor, and configured to prevent a surge based on a surge control signal; and a controller configured to generate the surge control signal for controlling the ASV when an operating point enters a surge control range, generate the supplementary surge control signal for controlling the IGV in an anti-surge mode when the operating point enters a supplementary surge control range set between the surge control range and a surge range, and generate the performance control signal for controlling the IGV in a performance mode until the operating point enters the surge control range.

A pump is provided for immersion in a fluid reservoir, such as a pit or lagoon containing liquid manure, from a position at an edge of the reservoir. The pump may be adapted for connection to a farm vehicle, such as a tractor, positioned at the edge of the reservoir. The pump comprises an extensible body, fluid conduit and drive means in order that a length of the pump may be varied in order to accommodate a variety of reservoir fluid heights. In addition, the pump may be pivotable relative to at least a portion of a frame in order that the entrance angle may be adjusted. The pump may comprise a housing with an inlet and an outlet, the outlet in fluid communication with the fluid conduit. An impeller within the housing may direct fluid from the inlet to the outlet in the housing.

An illustrative example embodiment of a compressor includes an inlet defining an intake passage, a plurality of lateral inlet guide vanes in the intake passage, and a plurality of medial inlet guide vanes in the intake passage. The lateral guide vanes are selectively oriented to alter an amount of fluid flow through a first, lateral portion of the intake passage. The medial inlet guide vanes are selectively oriented to alter an amount of fluid flow through a second, medial portion of the intake passage.

A regenerative pump includes a housing defining a cavity having a fluid inlet arrangement and fluid outlet arrangement, and a channel having an open volume extending between the fluid inlet arrangement and the fluid outlet arrangement. A rotatable shaft extends into the housing. An impeller is mounted to the shaft within the cavity and has a plurality of vanes spaced circumferentially around the axis and opening into the channel. An arm arrangement at least partially defines walls of the channel. The arm arrangement is radially movable to vary the volume of the channel. Enlarging the volume of the channel inhibits regenerative circulatory flow during pumping and limits the pressure generated.

A regenerative pump includes a housing defining a cavity having a fluid inlet arrangement and fluid outlet arrangement, and a channel having an open volume extending between the fluid inlet arrangement and the fluid outlet arrangement. A rotatable shaft extends into the housing. An impeller is mounted to the shaft within the cavity and has a plurality of vanes spaced circumferentially around the axis and opening into the channel. An arm arrangement at least partially defines walls of the channel. The arm arrangement is radially movable to vary the volume of the channel. Enlarging the volume of the channel inhibits regenerative circulatory flow during pumping and limits the pressure generated.