PUMP FOR HANDLING VISCOUS LIQUIDS Russian patent published in 2003 - IPC

FIELD: mechanical engineering; pumps. SUBSTANCE: invention relates to positive-displacement pumps designed for transfer of viscous liquids at higher proportioning and delivery. Proposed pump consists of housing and cover. Holder with driving and driven screws is installed inside housing. Flights of screws have base and tops with known and additional faces. Additional face is formed by cut of one part along line of known face and two parts along line of outer diameter of flight. Base of driving screw flight has straight section equal to or less in length than length of additional face of drive screw flights. EFFECT: provision of complete disengagement of delivery and suction chambers and accuracy of geometric form of screw flights. 4 dwg