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Centrifugal pump test

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petertha:
I drew up & 3D printed a bench test centrifugal pump. I was expecting anemic flow based on TLAR design #1, but it is apparently worse than that. Before mounting to my stationary motor, I gave it a spin-up in in the sink with my cordless drill. Even trying to pull 1" hydrostatic head & priming best & pinching outlet hose on & off, it just did not want to flow. Like at all. Some specs: inlet diameter = 6mm. Flares internally to 8mm rotor eye diameter. Throat maximum is 6mm wide x 4mm high, 8 rotor vanes are 6mm high (~0.2mm clearance to volute), rotor vanes are 1mm sec thick, outlet diverges from rectangular throat to round section by about 20% more section area. The minimum cutwater distance to rotor is about 0.6-0.8mm. The 2 pump halves are not sealed with a gasket, just lightly tightened face to face using M2 bolts you see. Any ideas? I can scale the volute down if its too aggressive for (not sure really - 'cordless drill' speed).

petertha:
PS - the pump insides are MUCH smoother than what you see on the outside which is rough as a result of print orientation & tree supports. I forgot to take a pics of the insides but will.

Dave Otto:
When you say 1" hydrostatic head, you are also saying that the inlet to the pump was being supplied with the fluid source 1" above the pump? So it should not need priming, just trying to understand.

Dave

CI:
I have used drill-powered pumps like that to transfer liquids, and the worked well, and were self-priming.
I suspect the pumps I used had a tight rubber impeller, which pulled enough vacuum to allow them to be self priming.
That is a nice pump design.
.

Vixen:
Hello Peter,

Can you post a full cross section, including the inlet. Then we can see exactly what you have designed. We can go from there.

Mike

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