Ways to Compress Air
Ways to Compress Air
(OP)
I need to know how I can compress air without an air compressor. Are there any mini compressors or air pumps?
I am working on project at work. I can give much detail, but this item must be able to expel air repeatedly on demand. It can't use an external air source such as (compressed gas bottle). This part should produce about 180 psi to 350 psi of air repeatedly on demand. This item should be no bigger than a fist. Anyone have any idea of where I can start, or websites/books I can get info on producing compress air?
I am working on project at work. I can give much detail, but this item must be able to expel air repeatedly on demand. It can't use an external air source such as (compressed gas bottle). This part should produce about 180 psi to 350 psi of air repeatedly on demand. This item should be no bigger than a fist. Anyone have any idea of where I can start, or websites/books I can get info on producing compress air?





RE: Ways to Compress Air
Good for 250 psi.
Cheers
Greg Locock
RE: Ways to Compress Air
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RE: Ways to Compress Air
STF
RE: Ways to Compress Air
RE: Ways to Compress Air
Depending on the environment that your device needs to operate in, one method stands out in my mind. Heat the air and it will expand. Small air compression devices are commonly used for hand held tools. One that comes to mind is a pneumatic nailer. These devices are readily available for you to inspect if this might be of interest. In essences, the device has a small bottle of propane and a combustion chamber. A small battery operated fan circulates air into the combustion chamber and propane is injected. When ignited the increase in air pressure drives a piston which in turns drive a nail. These are powerful yet small tools. If this might work for you, check them out at your commercial hardware store or lumber yard.
CRG
RE: Ways to Compress Air
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RE: Ways to Compress Air
You can't get good solutions with completely specifying the problem.
TTFN
RE: Ways to Compress Air
Don't know how much luck you'll have with a battery, I would think any battery capable of delivering enough juice for the volume & pressure of air you need the battery will either need constant changing or be the size of a car battery. One point nobody else seems to be concerned with though, do you have any temperature constraints? Even going from 10 psig to 180 psig with an industrial reciprocating compression would probably require a three stage machine with interstage cooling. That's a 13.9:1 compression ratio, adiabatic compression would produce a discharge temperature in the neighborhood of 550-600°F.
RE: Ways to Compress Air
How did you come up with the concept of a 13.9:1 compression ratio?
RE: Ways to Compress Air
Well, I'm assuming you're drawing atmospheric air into your suction and compressing it to a minimum of 180 psig. Using 14 psia for an atmospheric pressure just for the sake of an example you are compressing from 14 psia up to 194 psia. 194/14 = 13.9. Or did I read it wrong and you're actually boosting from 180 psig suction and discharging at 350 psig?
RE: Ways to Compress Air
Can the operator wear the battery on his belt to allow a little larger capacity without increasing the "gun" weight and size?
RE: Ways to Compress Air
Piston in a cylinder. One end of cylinder sealed from atmosphere and filled with a refrigerant type fluid. Other end of cylinder fitted with appropriate intake and discharge valves.
Cool the refrigerant, its saturation pressure drops (ideally below atmospheric pressure) pulling the piston towards that end of the cylinder and filling the other with air through the intake valve.
Heat the refrigerant. Saturation pressure rises, pushing the piston and compressing the air.
Essentially this is a steam engine driving a reciprocating compressor. Just no rotating parts.
RE: Ways to Compress Air
Regards
Pekelder
RE: Ways to Compress Air
RE: Ways to Compress Air
RE: Ways to Compress Air
Cheers
Azraq
RE: Ways to Compress Air