Rotary Piston Pump

Rotary piston pump for semi-solid products, in particular for minced meat, comprising:

• a stator (4) defining a cylindrical cavity,
• a rotor or barrel (5) housed in said cylindrical cavity, able to be driven in rotation by a motor (10), said rotor comprising an array of bores (51) spaced circumferentially, wherein pistons (9) are mounted,
• a mechanical cam cooperating with the pistons in order to provoke during the rotation of the barrel an alternating back and forth movement of said pistons between a low position and a high position,
• a lid (6) closing the cylindrical cavity,
• a feeding orifice (63) coming into communication with at least one cylindrical chamber formed by the barrel cylindrical bore and a piston associated therewith, and intended to be in communication with a hopper (3),
• a discharging orifice (64) able to come simultaneously in communication with at least two consecutive cylindrical chambers, and
• vacuuming means for vacuuming cylindrical chambers (8) for filling thereof,
• characterised in that said vacuuming means include at least one vacuuming channel (52) connecting to the lower part of each cylindrical chamber, said vacuuming means being able to vacuum by the bottom each cylindrical chamber by the vacuuming channel therewith when the piston associated therewith is in lower position.