Subject:
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Re: Random Pneumatic idea/question
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 21 Nov 2005 16:48:53 GMT
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Viewed:
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4706 times
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In lugnet.technic, Chio Siong Soh wrote:
> In lugnet.technic, Billy Bauman wrote:
> > Here we go. I finally got some pictures of my progress.
> >
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1495506
> >
> > The tank represents the load on the circuit.
> >
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1495508
> >
> > And this is with the ram for the load. I am very pleased to find that it
> > works.
>
> Nice work.
>
> With the exhaust sealed off, I figure the piston will move up and down gradually
> and gracefully rather than the quick movement that we're used too, because of
> the cushioning effect. This would be fine for an application like a scissor lift
> for jacking up a car but it might not be suitable to drive an engine.
>
> Would I be correct?
>
> CS
To be honest, I never actually intended it to be used in an engine. And to be
more truthful, I just buitl my first pneumatic engine a couple of days ago, so
my knowledge on the subject is a bit, archaic. I wanted to create a closed
circuit just to see if hydraulics were possible, and I'm close to finding my
answer. The problem is, the fluid itself. Obviously you wouldn't want to use
water in your hydraulic system, because that would damage the components, Which
warrents the use of oil. But oil's advantage is also its dissadvantage, for I
suspect that if even the TINIEST amount of oil was able to slip in between the
hose attaches and the port it attaches to, the lubricating qualities of the oil
would cause the tubing to just slip right off. And this is bad. also, in order
to construct a closed circuit, you need a 4-switch desing on the pumps and (if
my suspisions are correct.) on the load rams. For a 2 cylinder engine with
external valve controolers, (such as your own diagram)
http://www.fifth-r.com/cssoh1/control.htm
you would eight valves for the switch mechanisms and also four more for the
pump. 12 valves in a system is quite alot, especially in a system as simple as
this one should be. Also I think that it would be difficult getting the rams to
throw 4 switches, and that you may have to use 2 per switch device. This would
add more volume to the system, and thus make it slower. Obviously this is not
going to get us anywhere.
But on that note, I think that the closed circuit WOULD be perfect for a
scissor lift or jack, and that that should be the way it should be implimented.
I think your right. I think it wouldn't make a good engine, But I think that
it would make for a more powerful system. (as long as it holds together.)
Billy.
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Message is in Reply To:
 | | Re: Random Pneumatic idea/question
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| (...) Nice work. With the exhaust sealed off, I figure the piston will move up and down gradually and gracefully rather than the quick movement that we're used too, because of the cushioning effect. This would be fine for an application like a (...) (19 years ago, 21-Nov-05, to lugnet.technic)
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