Closed extraction stirrer

The utility model discloses a closed extraction stirrer. The problem that an existing closed extraction stirrer is low in liquid discharge amount is mainly solved. The utility model relates to a paddle, which is characterized by comprising an upper plate (1) and a lower plate (2), paddles (3) are arranged between the upper plate and the lower plate, the cross section of each paddle is a polygon formed by connecting at least three blades (31) end to end, a liquid inlet (21) is arranged on the lower plate, and a liquid discharge channel (4) communicated with the liquid inlet is formed between every two adjacent paddles. The utility model provides a closed extraction stirrer, which adopts a multi-blade type paddle structure, is large in liquid discharge amount and suction force, saves energy, reduces consumption, and reduces investment cost and purchase cost. Compared with a common disc stirrer in the market, the disc stirrer has the advantages that when experiments and CFD fluid simulation verification are carr