[Mohamed Sami] built a syringe pump out of Meccano building set parts. It consists of a simple framework with a DC motor mounted on it that actuates the syringe when powered. A check valve harvested from an ordinary household spray bottle keeps the syringe from sucking back liquid that it has just pumped out, so it can keep pumping forever. A lead-acid battery powers the whole thing.
Syringe pumps are typically used to deliver precisely measured quantities of substances. Right now [Mohamed]’s rig is just an uncontrolled pump, but he hopes to get a better understanding of and control over how much liquid gets pumped. Adding an encoder to the DC motor would be a start, was his thought — or even better would be a stepper.
You’d be surprised how many syringe pump projects we publish. Not just another syringe pump, but simple hydraulic projects and even using the syringe barrel as a logic probe’s enclosure.
I just
hackedmade a coffee with a coffee machine! No mechanical drawings, though.:)
Good tip for harvesting a check valve for cheap, but I would definitely swap out the motor for a stepper. Especially after seeing how slow it is running anyway.
There are no electronics in the project, and the motor has a gearbox.
” so it can keep pumping forever.”
I doubt it, syringes seem to get pretty worn after a few hundred cycles.
yes, but this is a simple kit to explain how it works, it isn’t industrial pump :)
just explain the concept of piston pump
Yeah, there is a definite reason for syringes to be considered a “one time use” for so called isolated systems in the medical field.
any combo of fluid, pressure, and friction is bound to fail sooner rather than later.
This reminded me of a “Dave The barbarian : Makes a megaphone out of a squirrel, string, and a megaphone”.