I probably said that wrong. I get that one cylinder feeds another, and
that that (smaller) cylinder can use its smaller size (with the same
power behind it) to shove more air into a tank, thus the higher pressure.
I just always wondered at really how much better you were getting if you
had cylinder A stuff smaller cylinder B, which stuffed the tank. You're
still putting the original volume of cylinder A into the tank with each
cycle. I get that running it through the slightly smaller cylinder B
allows just a bit more air to get stuffed in, but it seems that it's
only 'a bit'--you're not getting any huge payoffs (at least that's my
completely uninformed understanding from oogling two-stage compressors).
What Karl said about how some compressors use two first-stage cylinders
makes it make more sense to me. Using two first stage cylinders to feed
a second stage cylinder just seems to make more sense to me.
(Yes, I get that that's really the same thing as having just a 2x as
large single first stage cylinder, it's just all the two-stage
compressors I'm familiar with have two cylinders, with just one slightly
larger than the other. Since I assume they spin at the same speed, it
always seemed to me you're getting small gains in pressure.)
On 1/23/2012 5:00 PM, Jeff Scarbrough wrote:
> On Mon, Jan 23, 2012 at 3:43 PM, Scott<scott.hall.personal@gmail.com> wrote:
>> I'm curious about the 'how',
> A single-stage squishes the air and shoves it in the tank. A
> two-stage squishes it somewhat in one cylinder and feeds it to another
> cylinder that squishes it further, then shoves it in the tank. So,
> it's easier to attain higher pressures, and higher cfm at those
> pressures.
>
> Not all two-cylinder compressors are two-stage.
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