Electronics > Beginners
Need a small vacuum to suck liquid into a reservoir
engineheat:
Can I build a venturi tube using air tubings and a T fitting like this:
The compressed air (6 bar) we have come out of a 4mm tubing already. This might be an easy way to try if there is enough suction.
I'm thinking:
input: 4mm
output: 4mm
suction: 4mm
or would I get better suction if suction tube is smaller in diameter?
tautech:
--- Quote from: engineheat on December 27, 2019, 11:21:10 pm ---Can I build a venturi tube using air tubings and a T fitting like this:
The compressed air (6 bar) we have come out of a 4mm tubing already. This might be an easy way to try if there is enough suction.
I'm thinking:
input: 4mm
output: 4mm
suction: 4mm
or would I get better suction if suction tube is smaller in diameter?
--- End quote ---
Not really without an inserted nozzle on the compressed air supply side. But yes possible but you'd need to experiment to get good suction.
Have a study of the images here of how they are built:
https://www.google.com/search?rlz=1C1CHBF_enNZ760NZ760&sxsrf=ACYBGNSvvcWdhKePsxs-J4Vf6z7nJGhbrA:1577489388938&q=venturi+design+principles&tbm=isch&source=univ&sa=X&ved=2ahUKEwimn6j1_dbmAhWbyDgGHYunDH0QsAR6BAgKEAE&biw=1279&bih=673
Edit to add
With 6 Bar of available pressure a nozzle of 0.5-1mm would be adequate for what you want to do.
It seems you don't need to shift much oil so there's no need to use lots of air.
tautech:
Further understanding can be had searching for 'eductor'.
james_s:
A venturi will consume a lot of air, don't forget that compressed air is not free. A small electric pump is likely to be much more efficient.
Doctorandus_P:
If you can not stick the end of your tube into the liquid, but have to hover over it, then a small vacuum or membrane pump probably will not work satisfactory.
However, if you use a standard vacuum cleaner, you can such up lots of liquid from several cm away.
Of course use a vacuum cleaner that's fit for sucking liquids.
Another way is to use some kind of air cylinder or membrane that pushes the end of your tube into the liquid when the pump activates, and a spring to pull it back.
Or use a small stepper motor with a lever to move the end of the tube into and out of the liquid compartment. This is probably easier to make reliable then using the vacuum with some actuator, but would need more electronics.
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