Dual-impeller sewage pump
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How does that impeller inside work? Does the hole for the motor direction not leak water?
The impeller inside is used for creating a vacuum; it draws the medium into the pump chamber so that the larger impeller can function. There should also be a pipeline for filling the pump, as filling it is necessary when starting up the pump
Why doesn’t the C-shaped hole in the last image leak water? Is it connected to the impeller?
Is there a cover left that hasn’t been installed in the final diagram?
I guess so, I’m starting to understand:D
The impeller at the back is a secondary impeller; together with the blades on the back side of the main impeller, it forms a dynamic seal to prevent particles from entering the pump chamber
The impeller at the back is a water ring vacuum pump, which is used to exhaust the air from the inlet pipeline during startup, enabling self-priming
Your picture is incomplete, so it’s hard to say! If the pump is also equipped with a mechanical seal, then this small impeller must be that of a liquid ring vacuum pump, used to remove gas from within the pump and enable self-priming. In this case, the arrangement of the impellers is asymmetric, making it difficult to determine this from a single image ； If the pump does not have an additional mechanical seal, this small impeller should serve as a centrifugal seal!