Self-aspirating and gas-liquid dispersing impellers

An impeller comprising:

• a stirring shaft (1), a hub (2), a disc (3) and a plurality of blades (4);
• the stirring shaft (1) being a hollow stirring shaft, the hub (2) being coaxially sleeved on the stirring shaft (1), the disc (3) being connected to the hub (2), the plurality of blades (4) which extend in the radial direction being arranged on the circumferential side face of the disc (3), and a gas inlet channel (31) being formed in the disc (3);
• each of the plurality of blades (4) comprising an upper curved surface (41) and a lower curved surface (42), a rotary cavity (50) being embedded between the upper curved surface (41) and the corresponding lower curved surface (42), and the rotary cavity (50) communicating with the hollow stirring shaft (1) through the gas inlet channel (31);
• one side of the rotary cavity (50) is a liquid facing surface (46), the other side of the rotary cavity is a liquid backing surface (45), a liquid inlet channel (49) is formed in the liquid facing surface (46), and the liquid inlet channel (49) communicates with the corresponding rotary cavity (50);
• and
• the upper curved surface (41) and the corresponding lower curved surface (42) converge on the corresponding liquid backing surface (45).