Mini Internal Gear Pump

thingiverse

I have been playing around with some different pumps for a few projects. this is the final tested version, seams to work good pumps well and seams to last a long time. everything is printed other than the shaft witch i have added the stl and the pdf drawing. it might work with a printed shaft but some work might be needed in fitment. there are no bearings , everything is lubricated by the working fluid, and has no replaceable bushings. port fittings are g1/8 or 1/8bsp, witch i then tapped for 1/8 tapered pipe. can be powered with a few different motors, all of my pumps in this class have a bolt pattern on the back of the body that is 17mm diam, and a 4 bold circle ( on this pump one hole is suppressed but still has the same spacing) I was working on a magnetic sealed drive , or a sealed shaft but I had to many issues to make it worth wild and went with a less expensive and complicated design ( moved the motor away from the pump) parts needed : all internal gear pump parts are need 1 of each 1 shaft required for the pump and some 4mm shafting ( stainless preferred ) to use the long drive ( cut to suit your aplication ) also needs 3/4 pvc or equivilant to be glued in on one end and clamped onto on the other . 6x m3 x 10mm fasteners 3x m3x4mm fasterners the motor Im using has a 3.2mm shaft with no flat so I have it pressed into a plastic coupling witch seam to hold up in this application . ( ask if you want any specific couplings drawn up it wouldnt take much and ill add them here ) I will continue to work on this pump design as it was the most successful out of the other designed I attempted . I will post updates here for any improvements I come up with If you are interested I have a video that compares the different types of pumps and talks about how I ended up with this as the winner . https://youtu.be/0Hz-KQRJ-Rc Update: july 19 2022: added 2 ported front covers, 1/8npt , 8mm barbs ,and body without ports.