Axial flow pump having a non-circular outlet cross-section

Hydraulic pump comprising a pump shaft and a casing delimiting a liquid circulation duct in which the cross-section of the outlet orifice is flattened and that is oriented such that the liquid outlet direction is inclined from a longitudinal axis of the pump shaft passing through said casing, the casing comprising a first segment in which the inside surface has a circular cross-section centred on said longitudinal axis and surrounding a pump impeller supported on the pump shaft,

• wherein said first segment has a downstream end from which the cross-section of the casing inside surface becomes flattened, and wherein said flattened cross-section of the outlet orifice is generally rectangular in shape,
• wherein the casing comprises a second segment formed in continuity with the first segment, the second segment having an inside surface with a variable cross-section and being arranged entirely around the pump shaft, and being centred on the longitudinal axis over its entire length,
• said casing comprising an elbow formed in continuity with the second segment, and an outlet segment formed in continuity with the elbow, the pump shaft crossing said casing at the elbow,
• said elbow and the outlet segment having an internal surface with the same cross-section, this cross-section being identical to the cross-section of the outlet orifice located at the downstream end of said outlet segment.