PUMP UNIT Russian patent published in 1995 - IPC

FIELD: pump engineering. SUBSTANCE: bank of cylinders having plungers is mounted inside a housing. The plungers are received in wells of the bank. Grooves are arranged in the plane which passes through the center of the well and center of rotation of the cylinder bank from the side of the rotation axis. The wells are provided with grooves. Additional grooves, which are opposite to these grooves, are connected with the internal space of the plungers. The grooves provided from the side of the rotation axis are connected with the inlet pipe line thought the internal space. EFFECT: enhanced efficiency. 2 dwg