PUMP Russian patent published in 2004 - IPC

FIELD: handling liquids in transport facilities, industries and in domestic equipment. SUBSTANCE: inner surface of pump housing is provided with two passages which are perpendicular relative to generatrix of cylindrical surface; these passage are located oppositely; one passage is communicated with liquid inlet branch pipe and other passage is communicated with liquid outlet branch pipe. Beginning of passage communicated with liquid inlet branch pipe coincides with line which is tangential relative to the first piston when two adjacent pistons are located at minimum distance and beginning of passage connected with liquid outlet branch pipe coincides with line which is tangential relative to first piston when both pistons are at maximum distance. EFFECT: simplified and balanced-out construction of pump; enhanced efficiency. 5 cl, 5 dwg