Subject:
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Re: Pneumatic cylinder/pump
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 12 Nov 2006 03:11:55 GMT
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Viewed:
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9693 times
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Well I've just built this, and I can say that with a minor modification
the pump works fine.
You need to join the outputs from the two switches depicted through a
third switch to prevent pressure being lost through the exhaust port.
However, since there is no one-way valve anywhere in the system, pumping
becomes harder and harder as the air pressure builds up.
It actually pumps about the same air as a hand pump for a given number
of cycles, even though the cylinder is pumping on the up-stroke as well
as the down-stroke, but the extra effort required to flip 3 switches
would make it less efficient.
In short, while a cylinder, 3 switches and the required lengths of
tubing would be more expensive than a pump, (or possibly even a couple
of pumps), it's nice to know that I've got something that I can use,
even if all my pumps break.
Play on.
Owen.
Owen Dive wrote:
> Hi all.
> For all those who, like me, have many pneumatic cylinders, but only a
> limited supply of pumps, I believe I have come up with a way to get a
> source of air pressure, using a cylinder and two switches. I've knocked
> a quick circuit diagram up in Paint.
>
> <http://www.brickshelf.com/cgi-bin/gallery.cgi?i=2114017>
>
> The following sequence should be followed. Compress the cylinder, then
> flip the switches, then extend the piston, then flip the switches. Then
> repeat.
>
> Of course, the mechanisms required to make this work may well make this
> too big to be useful, but you could hook up many cylinders in parallel
> to increase ariflow, and if it's the only source of air that you have...
> :-)
>
> I haven't yet had the chance to actually build this, as all my
> pneumatics are currently engaged in other projects, but I can't see any
> reason why it wouldn't work. The only thing that's bothering me is that
> it seems so simple, yet I've never seen it before.
>
> If someone knows of any reason for this not to work, please let me know.
> Play on.
> Owen.
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Message is in Reply To:
 | | Pneumatic cylinder/pump
|
| Hi all. For all those who, like me, have many pneumatic cylinders, but only a limited supply of pumps, I believe I have come up with a way to get a source of air pressure, using a cylinder and two switches. I've knocked a quick circuit diagram up in (...) (20 years ago, 3-Nov-06, to lugnet.technic)
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