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Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
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Posts: 268
In another thread someone mentioned fridge compressor can be used as vacuum pump. Is it just something intusic about fridge compressor, or can I chain the workshop composer together? Is it the difference from input to output and the number in series that will ditectate the final pressure.
I'm after a cheap way to get lowish pressure 1psi.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
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Posts: 615
The cheapest way to get to 1 psi would be a water aspirator. Also known as a Venturi pump. You can easily make one with a few short pieces of copper pipe.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
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Posts: 615
And here's an aspirator:
The pump will reach a much lower pressure than the aspirator, but the aspirator is a better option for nasty gases, such as vacuum distilling acids. Both are cheap enough there's no need to muck about with fridge compressors or similar.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
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Posts: 615
Plasma wrote ...
and see if it gets low enough to light a plasma with a Nst.
My home made one does, so the bought one should be capable too. The colder your water is the better the vacuum will be.
Be warned: when you turn off the water you will lose your vacuum, and its likely any water remaining in the aspirator will be sucked back into what ever you evacuated. So add a valve and/or a trap (just another jar between your experiment and your aspirator to catch any water). This doesn't happen with pumps - they will hold vacuum without power.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Don't overlook the very cheap hand operated pistol-grip type vacuum pump. Some low pressure devices do not require a high vacuum for interesting effects to be observed. As an example, Geiger-Muller tubes operate at pressures between 5% - 50% of air pressure, which can easily be achieved with the hand operated pump where only a small volume of low pressure gas is required in the tube.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Hi Plasma, I mean a very cheap pump like this one on ebay:
With one of these you can reduce the pressure in a small volume chamber - like a glass test tube - sufficient to make old-fashioned Geiger Muller tubes (high voltage with organic quench like ethanol or butane) and produce other effects.
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Air compressor as a vacuum pump
