Venturi water pump w/ concentric nozzle (aka Infinity Jet) for garden hose

thingiverse

This is a Venturi water pump, with a concentric continuous nozzle. I needed a pump that was able to suck up sandy water from the rain and drainage pipes, also I wanted to learn some Fusion360 modeling. Other Venturi pump designs I found on Thingiverse kinda worked, but were either flimsy, or clogged-up easily. If You search about this type of design (Infinity Jet), you'd find that's it's used for gold sand dredging and ROV substrate removal, and it's touted for its' efficiency and uncloggability, but the sizes start from 2", way too much for a garden hose powered pump. Suction-outlet path minimum cross-section diameter is ~18.9 mm, so it should be able to cope even with small gravel. I've tested several versions of this thing, and found out that for my garden hose pressure, 0.3mm nozzle gap worked quite well (at least it empties a bucket in a few seconds). In failed versions 2mm and 1mm nozzle gap provided laughably little suction, but made for an ok watering nozzle. So, the nozzle gap should be small, from 0.05mm to 0.5mm, depending on pressure and flow capability. Since the original design weighs ~130g for PLA, I've also made a refined version that should work just as well, but weighs only 90g total. There are 2 nozzle variants for the refined version: 0.3mm and 0.2mm gap. If you need a different nozzle gap, ask, I'll upload it. Pump connections (all male): - Pressure input 1/2" - Suction 1" (3/4" for the refined version) - Outlet 3/4" (tip: put a ball valve here for priming)