Abstract: A centrifugal compressor includes an impeller, a compressor inlet pipe for guiding air to the impeller, a scroll passage disposed on an outer peripheral side of the impeller, and a bypass passage connecting the compressor inlet pipe and the scroll passage and bypassing the impeller. In a cross-section perpendicular to an axis of the compressor inlet pipe, when A1 is a connection portion on a downstream side in a rotational direction of the impeller of connection portions between an inner wall surface of the compressor inlet pipe and an inner wall surface of the bypass passage, C is a virtual circle constituting the inner wall surface of the compressor inlet pipe, and L1 is a tangent line of the virtual circle C at the connection portion A1, the inner wall surface of the bypass passage is formed from the connection portion A1 along the tangent line L1.

Abstract: A pump rotor includes a hub, a back plate and a plurality of blades extending from the hub and disposed on the back plate. Each of the plurality of blades has an outer surface essentially parallel to a rotational axis of the hub, and a first end adjacent the hub and a second end distal from the hub, the first end having a height from the planar surface that is less than a height from the planar surface of the second end. The plurality of blades is configured to cause a synchronized central column of flow.

Abstract: A pump includes a housing having an internal surface defining a volute configured to receive a pump impeller therein, an extension tube fluidly coupled to the volute, a wall of the extension tube having an internal surface disposed opposite an external surface, and a bonnet having an internal surface defining a first inlet aperture and a second inlet aperture therethrough, the first inlet aperture and the second inlet aperture being in fluid communication with the volute via the extension tube. The internal surface of the bonnet and the external surface of the extension tube define a bonnet flow path therebetween, the first inlet aperture of the bonnet being in fluid communication with the volute via the bonnet flow path.

Abstract: A pump device (1A) includes: an impeller (2) that rotates about an axis of rotation (A); an inlet passage (10a) that extends along the axis of rotation (A) of the impeller (2); a volute chamber (10b) provided around the impeller (2); a high-pressure chamber (4) provided around the inlet passage (10a); a circumferential wall (5) that separates the inlet passage (10a) and the high-pressure chamber (4); and a bypass passage (6) that communicates the volute chamber (10b) and the high-pressure chamber (4). The circumferential wall (5) has a plurality of through holes (51) provided in a circumferential direction. The central axis (B) of each of the through holes (51) is included in a plane substantially perpendicular to the axis of rotation (A). The central axis (B) is inclined with respect to a reference line (L).

Abstract: In order to improve a turbo compressor comprising a compressor housing, in which an incoming gas volume flow is supplied to an impeller channel through an inlet channel, is compressed in the impeller channel by an impeller and is discharged from the impeller channel via an outlet channel, and a flow diversion channel which is provided in the compressor housing, extends outside of the impeller channel and the inlet channel, opens into the inlet channel with an opening on the inlet side and into the impeller channel with an opening on the impeller side and conveys a diversion volume flow between the openings as a function of a difference in pressure, in such a manner that it can be operated optimally with volume flows which are far below the volume flow provided for the design point it is suggested that the flow diversion channel have a cross-sectional flow area increasing in size up to the opening on the inlet side proceeding from the opening on the impeller side.

Abstract: There is provided a compressor (10) and an associated method for controlling a recirculation flow to control surging in the compressor. The compressor includes a housing (12) and a compressor wheel (16) mounted therein. A recirculation passage (41) receives compressed air from the compressor and recirculates the compressed air to an inlet passage (20) of the housing and, in particular, to leading edges (32) of blades (18) of the compressor wheel. An adjustable flow control device (60) is configured to control the flow of the compressed air through the recirculation passage to control a surge characteristic of the compressor. For example, the flow control device can include one or more valves (V1, V2, V3), each of which can be adjusted by an actuator (64).

Abstract: There is provided a compressor (10) and associated method for providing a flow of recirculated air to control surging in the compressor. The compressor includes a housing (12) with a compressor wheel (16) rotably mounted therein. The housing defines at least one injection port (36) configured to receive compressed air from the compressor wheel and recirculate the compressed air to an inlet passage (20) of the compressor. In particular, each injection port defines an outlet (38) proximate to the leading edges (32) of the blades (18) of the compressor wheel such that the compressed air is delivered to the leading edges and reduces the occurence of surging.

Abstract: A housing is incorporated as part of a compressor having blades that impart to a fluid a momentum along a main gas flow direction and a swirl. The housing includes a channel that has at least one channel wall and defines an axis substantially aligned with the main gas flow direction. The channel is configured to duct at least some of the fluid. The channel wall defines an internal cavity that extends axially within the channel wall. A bleed passage connects and provides fluid communication between the channel and the cavity. The channel wall defines a plurality of injection passages providing fluid communication between the cavity and the channel at a location spaced in a direction opposite the main gas flow direction from both the bleed passage and the blades. The injection passages have a portion configured to direct fluid from the cavity into the channel with a component along the main gas flow direction and a component opposed to the swirl.

Abstract: A housing is disclosed for a compressor having a duct defining a main gas flow axis and blades that draw a fluid through the duct. The blades impart to the fluid a momentum along a main gas flow direction and a swirl. The housing includes a volute configured to extend substantially circumferentially around and fluidly communicate with the duct (at a first location). The volute may be configured to direct a fluid portion flowing thereinto from the duct to have a velocity with a component in a first circumferential direction generally aligned with the swirl. The housing may also include at least one conduit, such as a pipe, in fluid communication with the first volute. The conduit may be configured to redirect the fluid portion to have a velocity with a first component along the main gas flow axis in a direction opposite the main gas flow direction and a second component in a second circumferential direction opposite to the first circumferential direction.

Abstract: A compressor assembly (304) includes a compressor housing (312) having a main air inlet (324) and an annular wall (328) defining an inducer bore (325). A secondary inlet passage (322) is disposed around the inducer bore (325). The secondary inlet passage (322) has an inlet slot (320) operatively intersecting the inducer bore (325) to permit the entry of a fluid thereinto through an inlet port (327). The inlet slot (320) advantageously defines an augmented inducer diameter region (331). Preferably the secondary inlet passage (322) may be selectively partially or completely isolated from the main air inlet (324). A compressor wheel (318) is located in the compressor housing (312) and has a stepped portion (330) formed by at least one plurality of vanes (238) operatively associated with the augmented inducer diameter region (331) adjacent to the inlet slot (320) of the housing (312) to receive fluid therefrom.

Abstract: To provide a pump comprising an impeller which sucks and discharges liquid, a motor unit which drives the impeller, a parting plate which is disposed between the impeller and the motor unit and which partitions the impeller and the motor unit, a case formed with a pump chamber in which the impeller is accommodated, a suction port which is connected to the case and which sucks liquid and a discharge port which discharges liquid, wherein the case is provided with a discharge passage which discharges liquid introduced into the pump chamber from the suction port, the discharge passage has a predetermined diameter, the discharge passage is provided along an outer periphery of the pump chamber at a location at a predetermined distance from the outer periphery of the pump chamber, the pump further comprises at least one reflow passage which brings the discharge passage and the pump chamber into communication with each other and through which liquid flowing through the discharge passage flows back to the pump chamber

Abstract: Fluid transfer controllers (FTCs) having a rotor assembly with multiple rotor blade sets coupled to a hub component of the rotor assembly and further having barrier components forming passages for routing fluid through the multiple rotor blade sets are provided. More specifically, the FTCs include passages for routing fluid along one side of a dividing structure to which a first set of rotor blades is attached and subsequently along the opposite side of the dividing structure to which a second set of rotor blades is attached. The dividing structure may be the hub component of the rotor assembly or a partition separating different levels of rotor blades within the rotor assembly. In some cases, the FTCs may be configured to route fluid from the first rotor blade set to a thermal energy alteration device and further route fluid from the thermal energy alteration device to the second rotor blade set.

Abstract: A pumping apparatus for pumping a liquid from a source to a target including a motor, a first pump driven by the motor, a second pump driven by the motor and a separator in fluid communication with the first and second pump for separating a liquid received from a source into a gaseous component and a liquid component. The separator further diverts the gaseous component to the first pump and the liquid component to the second pump, wherein the first pump pumps the gaseous component back to the source and the second pump pumps the liquid component to a target.

Abstract: A compressor for compressing a gas comprises an impeller wheel (1) including a plurality of vanes (4) rotatably mounted within a housing (2). The housing (2) has an inner wall defining a surface (5) located in close proximity to radially outer edges (4a) of impeller vanes (4). The compressor inlet comprises an outer tubular wall (7) extending forming a gas intake and an inner tubular wall (8) extending within the outer tubular wall (7) and defining an inducer portion (10) of the inlet. An annular gas flow passage (11) is defined between the inner and outer tubular walls. There is at least one downstream aperture (13) communicating between the annular flow passage (11) and the surface (5) of the housing (2) swept by the impeller vanes (4) and at least one upstream aperture communicating between the annular flow passage (11) and the inducer or intake portions of the inlet.

Abstract: A centrifugal pump with facilitated self-priming, which comprises a casing with a suction inlet and a discharge outlet and with an internal series of diffusers and impellers, which form a cylindrical assembly that forms, together with the casing, an annular interspace which is connected to the inside of the series of diffusers and impellers on the discharge side through corresponding openings and on the inlet side through a hole arranged perimetrically in the intake region; the hole is controlled, on the side of the interspace, by a normally-open flexible metallic laminar valve. A wall of the pump struck by the fluid exiting from the interspace through the controlled hole is shaped so as to have a double symmetrical channel for imparting to the fluid a double vortex before passing through the first impeller.

Abstract: In an air compressor, particularly for an internal combustion engine, which has a compressor housing with a flow duct structure and a recirculation arrangement including a bypass structure for recirculation some of the air entering the compressor wheel, a recirculating ring is arranged in the bypass flow structure around the compressor wheel and the ring has a plurality of flow passages distributed uniformly around its circumference with inflow orifices at the radial inner end in communication with the compressor flow duct and outflow orifice at the radial outer end in communication with a by-pass flow space.

Abstract: A submersible pump assembly has a pump and a valve connected to the outlet of the pump. An outlet of the valve is connected to a riser. A valve member in the valve housing is vertically movable between a pumping position and a priming position, the valve member being biased toward the priming position. A priming conduit connects the outlet of the valve housing to the inlet of the pump for directing well fluids flowing through the conduit into an intake of the pump for re-priming the pump. When the pump is pumping well fluid, the valve member is moved to the pumping position by the fluid pressure, well fluids flowing from the inlet of the valve housing to the outlet of the valve housing but not through the priming conduit. When pumping ceases, the valve member returns to the priming position, well fluids flowing through the priming conduit for re-priming the pump.