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External Gear Pump Design

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jcge:
Found this document online which covers the design of external gear pumps. Probably more that you ever wanted to know.

NRL/8230/FR--2022/3
Fundamentals of External Gear Pump Design
LOGAN T. WILLIAMS
DISTRIBUTION STATEMENT A: Approved for public release. Distribution is unlimited.

Courtesy of the US Naval Research Laboratory

https://apps.dtic.mil/sti/pdfs/AD1169714.pdf

Regards
John

/edit - added link as the file is too big 4MB to upload.

Mike R:
I find it somewhat timely that this is posted, I was casually investigating gear pumps and their designs as a potential alternative as a model locomotive feed water pump. 
The general consensus is that a gear pump isn't great at higher pressure water pumping due to the losses (parasitic leakage) associated with lower viscosity fluids like water.

However I did stumble on a "new" (https://patents.google.com/patent/US4127365 - patent is 1977) variant of the gear pump called a suction shoe pump.  Intriguingly, it claims to be good with lower viscosity fluids.


Ah if I didn't have to work for a living I'd be playing with this to see if its feasible for models..  It doesn't seem that its much of stretch from current gear pumps, and with the patent expired I'm rather curious why its not being proliferated by others.

jcge:
Hi Mike - I see that Micropump Corporation still do use that IP in their current product lineup.
John

tghs:
I have a couple of magnetic drive micropump pump and motor units,, they were used in industrial printers,, neat thing with the mag-drive was no shaft seals needed. not large volume but would get up to around 85psi deadhead..

steamer:
Thanks John!

Dave

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