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Engine Demonstrator Compressor Project

An HPLV compressor?

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Neil Wyatt11/03/2014 16:38:22
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19226 forum posts
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Hi Ian,

Your 'suitable' pump sounds very much like my diaphragm compressor which I use with a small fire extinguisher bottle as a receiver (x12 safety margin). It has a reed valve and a propensity to stall just above 30psi.

Neil

Steve Withnell11/03/2014 19:24:23
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Posted by JasonB on 10/03/2014 20:06:30:

Steve not sure how you got there but I recon 3.15cu in which is about 0.05lts or 50cc per rev.

Can someone check my maths - 1" bore x 2" stroke

0.5 x 0.5 x 3.142 x 2 = 1.57

1.57 x two as its double acting = 3.15 or 0.05ts using online converter

I've got an 80lts airpump on my koi pond gets a lot louder when there is a restriction or the depth (pressure) increases and runs hotter

Edited By JasonB on 10/03/2014 20:08:14

My maths were 50mm x 12.5mm x 12.5mm x 3.142 x 2 (stroke x bore/2 x bore/2 x Pi x double acting) to get to swept volume per rev. However, looking at the cylinder and a 1 litre jug, the answer ain't 0.5 litres!! Suspect I had the decimal point in the wrong place which would agree with your maths. So 100rpm would then need 5 litres of air per minute, which seem very doable. (I bored my cylinder 25mm not one inch btw, haven't a clue why, it just happened)

Steve

Steve

jason udall11/03/2014 20:55:07
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Steve..along as your piston was 25 mm not1"...
Ian S C12/03/2014 09:49:03
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7468 forum posts
230 photos

Neil, the wee compressor is made by De Vilbiss. The only specs on it are 230V .8A 50Hz, on a paper lable. A simple pneumatic cut off switch would be easy enough to make, and a safety valve for the cylinder could be made, or purchased from a compressor supply agent. Ian S C

Ian S C12/03/2014 13:21:03
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7468 forum posts
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Bit more on the De Vilbiss compressor; sound level 51dB, air flow 9 L per min at 30psi. Motor 100 Watt. Ian S C

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