In this invention, an discharging port and water output channel are made on upper portion of pump shell and there are suction holes between air chamber and pump shell. When single-stage single-suction vane wheel is used, the pressure releasing hole on the lower end cover of pump can balance the axial force fully. When single-stage dual-suction vane wheel is used, water absorption ports are made on the lower end cover of pump for balancing axial force of pump ideally. This submersible pump is suitable for the water area where silt carrying capacity is higher. |