Closed submersible sewage pump impeller:
The impeller of this type has higher normal efficiency. The submersible sewage pump with this type of impeller has smaller axial force and can install auxiliary vanes on the front and rear cover plates. The secondary vanes on the front cover plate can reduce the eddy loss at the impeller inlet and the wear of particles on the sealing ring.
The secondary blades on the back cover plate not only balance the axial force, but also prevent suspended particles from entering the mechanical seal chamber to protect the mechanical seal. However, the impeller has poor plug-free performance and is easy to winding. It is not suitable for pumping large particles (long fibers) and other end-treated sewage media.
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