ROTOR-PISTON TYPE PUMP (VERSIONS) Russian patent published in 1999 - IPC

FIELD: fluid pumping equipment used in various branches of industry. SUBSTANCE: according to first version, pump has casing, cylindrical rotor, suction window and delivery window, two pistons spaced along longitudinal axis of rotor and positioned for progressive movement along rotor transverse axes right-angled one with respect to another by means of guides. Pump is further provided with drive mechanism for rotating rotor in synchronism with motion of pistons in guides. Casing has cylindrical inner surface. Drive mechanism is formed as shaft offset relative to rotor central axis for eccentricity value and equipped with two projections with the same eccentricity relative to central axis of rotor and with eccentricity axes of one projection relative to the other projection spread out for 180 deg. Pistons are pivotally connected to projections. Shaft is positioned between rotor guides. According to second version, each piston has circular section. Linear sizes of suction window, delivery window, pistons and guides in plane perpendicular to axis of rotation of rotor are equal to side of square inscribed into circle of diameter equal to that of rotor. According to third version, rotor is made composite and provided with spacer. Each piston is made in the from of cylindrical segment. Guides are formed as channels with surface curvature similar to that of cylindrical part of segment. EFFECT: increased feed and pressure difference, simplified construction and reduced sizes. 11 cl, 7 dwg