A suction pipe inlet device for a centrifugal pump, the device having a hollow tubular axisymmetric body along a longitudinal axis having an open first end adapted for fitting into or against a retention tank; an open second end adapted for fitting into or against an inflow end of a suction pipe having an outer pipe diameter and an inner pipe diameter; a converging section located closer to the retention tank; a diverging section located closer to the suction pipe; a throat located at the intersection point between the converging and diverging sections, the converging and diverging sections defining an interior converging-diverging geometry within the tubular axisymmetric body and the throat defining a minimum inner cross sectional area of the tubular axisymmetric body.

The disclosure relates to a slurry pump for mineral processing and a pump housing for a slurry pump. The pump housing comprising a front part, a peripheral part, and a back part. The peripheral part comprises one or more first protrusions and/or indentations configured to create a turbulent flow.

A centrifugal pump for pumping blood includes a housing 2 with a housing main body 20, a blood inlet port 25, and a blood outlet port 26. A rotary body 3 is rotatably accommodated inside the housing main body 20, and a support mechanism 4 supports the rotary body 3. The support mechanism 4 is provided with a rod-like shaft member 5, and a first bearing 6 and a second bearing 7 which respectively and rotatably support end portions of the shaft member 5. The first bearing 6 is provided with a protruding portion 62 which protrudes in an eccentric manner with respect to a rotation center O when viewed from an upstream side of a blood flow, so that the protruding portion shields a counter-rotating, longitudinal side of the shaft member from exposure to the main flow of blood.

Provided are non-limiting embodiments of a wear-resistant impeller having a non-conventional blending provided between a surface of a vane and a surface of at least one of a front side shroud (15) and a rear side shroud (16). The impeller may comprise both a rear side blending gland a front side blending (2), and the front side blending (2) may comprise a different geometry from the rear side blending (3). The blending preferably comprises a bulbous geometry which is uniquely adapted for optimizing flow patterns adjacent to the vane and between the front and rear side shrouds in a manner which discourages the formation of horseshoe vortices proximate the leading edge (6) of the vane (1) during operation. Through the reduction, mitigation, or elimination of horseshoe vortices, local high velocities and turbulence are generally minimized, and wear experienced by portions of the impeller (e.g., to one or more vanes) from flows of abrasive slurry can be reduced. Accordingly, the useable life of an impeller may be improved.

A centrifuge turbo machinery includes an impeller which rotates about an axis to pressure-feed fluid flowing along the axis to an outer side in a radial direction, and a casing which accommodates the impeller and has a facing surface facing the impeller in an axial direction. A convex portion relatively close to the impeller and extending in the radial direction and a concave portion relatively spaced apart from the impeller and extending in the radial direction are alternately and continuously formed on the facing surface in a circumferential direction.

A subsea fluid pressure-increasing machine includes an elongated member that is rotatable about a longitudinal axis. The machine also may include a plurality of impellers each having a leading edge, a trailing edge, a suction side, and a chord line defined by a line between the leading and trailing edges. Each impeller is fixedly mounted to the member such that a chord angle defined by an angle between the chord line and the rotation direction is less than or equal to a stall angle at which a maximum force is exerted on a fluid in a direction primarily parallel to the longitudinal axis when the member is rotated in the rotation direction. At least some of the impellers comprise one or more features that effectively reduce a pressure peak or specific loading of the suction side such that the axial length of the impeller is configured to be reduced without exceeding a desired specific load.

An efficient reverse-thrusting modular propeller combines a center hub and a set of identical and replaceable blades. Each such blade has a radially and laterally symmetrical hydrofoil cross-section but disposed along a full wave (360) sinusoidal mean camber line. The blades all feature a very strong thicker symmetric hydrofoil cross-section at the propeller root which widens with a longer sinusoidal mean camber line wavelength, and thins in amplitude moving outward, and then the blades narrow again in shorter wavelength and thin more in diminishing amplitudes progressing toward the distal tip. Localized cupping on the leading or trailing edges is ruled-out as undesirable and counterproductive.

A subsea fluid pressure-increasing machine includes an elongated member that is rotatable about a longitudinal axis. The machine also may include a plurality of impellers each having a leading edge, a trailing edge, a suction side, and a chord line defined by a line between the leading and trailing edges. Each impeller is fixedly mounted to the member such that a chord angle defined by an angle between the chord line and the rotation direction is less than or equal to a stall angle at which a maximum force is exerted on a fluid in a direction primarily parallel to the longitudinal axis when the member is rotated in the rotation direction. At least some of the impellers comprise one or more features that effectively reduce a pressure peak or specific loading of the suction side such that the axial length of the impeller is configured to be reduced without exceeding a desired specific load.

A centrifugal pump for pumping blood includes a housing 2 with a housing main body 20, a blood inlet port 25, and a blood outlet port 26. A rotary body 3 is rotatably accommodated inside the housing main body 20, and a support mechanism 4 supports the rotary body 3. The support mechanism 4 is provided with a rod-like shaft member 5, and a first bearing 6 and a second bearing 7 which respectively and rotatably support end portions of the shaft member 5. The first bearing 6 is provided with a protruding portion 62 which protrudes in an eccentric manner with respect to a rotation center O when viewed from an upstream side of a blood flow, so that the protruding portion shields a counter-rotating, longitudinal side of the shaft member from exposure to the main flow of blood.

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). The direction of inclination of the central axis (B) with respect to the reference line (L) is determined so that an inlet passage side opening (51q) of the through hole (51) is located downstream from a high-pressure chamber (4) side opening (51p) in a rotational direction of the impeller (2).