Passion for the return pumps, my collection and research

Randy Holmes-Farley

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A water loops that keeps the impeller cavity flushed and cooled. In the early generation of wet magnetic drive pumps, the heat in the impeller cavity and overall lack of water movement would cause rather quick calcium precipitation deposits on the rotor (impeller magnet) and back end of the cavity and bearing.

Some pumps do a much better job at this than others. Look at the pump photo above, There is an intake port at the top that is connected to the hole at the rear of the impeller. The impeller has a hole through the shaft. This keeps water moving around and through the impeller, driven by the pressure difference between the water in the center and edge of the volute.

Ok, thanks. I simplistically assumed a high flow pump would have little time for the water to heat up, and the heat on the impeller wouldn’t be reduced by much by even more flow.
 
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Ok, thanks. I simplistically assumed a high flow pump would have little time for the water to heat up, and the heat on the impeller wouldn’t be reduced by much by even more flow.
the heavy pump need cooling itself, by some ways:
1- anti-lime-by pass (alti calcification) to remove detritus and cooling the rotor and inner stator, in Abyzz, it's simply a tube through back to front , in Octo/ Zoox: the system is more complicated: a tube, and the end of the tube as showed in 3rd photo make water through the back be even like bubble plate/ disc of protein skimmer to have less tremble. And, they make a hole / tube inside the shaft to connect water back- front too, so the pressure of water in the chamber of stator.
2- good material/ finish : the better finition, the less variable move inside the motor, less friction between the component, so less heat
3- good technique: like rotor/ stator in advance technique in Zoox with 8 poles rotor, the movement become smoother.
 

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Ok, thanks. I simplistically assumed a high flow pump would have little time for the water to heat up, and the heat on the impeller wouldn’t be reduced by much by even more flow.
I know it as the anti lime bypass. I've had quite a few pumps seize because that port clogged and calcium was allowed to build on the magnet.

Most people are unaware of what that port is and that it's a must to make sure it's flushed out during cleaning.
 

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