PUMP UNIT Russian patent published in 1996 - IPC

FIELD: pump engineering. SUBSTANCE: pump unit has pump 1 connected with tank 2 through sucking pipe line 3 provided with mixer 4 and pipe lines 5,6, and 7 connected with it and having throttles 8, 9, and 10. Delivery line 11 has reservoir 12 and control unit 13. When the level of a fluid in tank 2 drops, pipe lines 5, 6, and 7 are connected alternately with the ambient through throttles 8,9, and 10 and supply an increased portion of gas to mixer 4 resulting in decreasing capacity of pump 1. The gas, entering delivery line 11, enters reservoir 12, is extracted at the top part, and is directed to control device 13. As a result hydraulic resistance of the control device gets rise, capacity of pump 1 drops, and fluid level in tank 2 lifts. When the level of fluid in tank 2 rises, the reverse sequence occurs. EFFECT: enhanced efficiency. 1 dwg