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Simple Pump Action Design

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Simple Pump Action Design

Unread postAuthor: jean » Wed Sep 28, 2016 1:55 pm

Hi,
i am a rookie with cad, but it will be enough to understand the whole concept.
Hopefully your will leave a comment or critique

The design comes up with only a few parts.
1. The blue one is the moving part. Built of butane reservoir, outer part of the meter and a piston (with one-way-oring).
2. The green one - barrel and endplug, for the combustion chamber.
3. The red one - inner part of the meter, endplug (with one-way-oring).

Remenber .. green part and red part are "static" parts.

1.By moving the blue part to left...
-the piston suck fresh air in (right side)
-the piston push the (old) gases (left side of piston) out into the enviroment
-the butane-reservoir shut up
-the meter-pipe open (meter-pipe to chamber)


2.By moving the blue part, from left to right (front to back),
-the piston will displace the air/fuel from the right side of the piston to the left side of the piston (passing the lose oring)
-the meter-pipe shut up (meter-pipe to chamber)
-the butane-reservoir get open

ready to ignite..

:)
Sorry for bad english..
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Re: Simple Pump Action Design

Unread postAuthor: mark.f » Thu Sep 29, 2016 11:47 am

I had a similar idea that I never got around to implementing here. Essentially it's the same operating principle although yours is a lot better.

Hopefully we can see something like this in action. :D
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Re: Simple Pump Action Design

Unread postAuthor: jean » Thu Sep 29, 2016 5:23 pm

Thanks for you reply:)
Nice design.
And yes i hope it to :mrgreen:

So i just ordered some aluminium pipe 3"x8" (80mmx2mmx200mm).

Orings are the next on my list but i have some trouble to decide the dimensions and materials...some help is very welcome.
Should i skip the orings and go with a flap-check-valve design..?

Some of the parts will be 3d-printed in ABS :idea:, there no problems with oring grooves or something like that.
Ordered a spool of flexible TPU-filament to try printable seal.
Ideas are welcome:)
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Re: Simple Pump Action Design

Unread postAuthor: mark.f » Thu Sep 29, 2016 8:34 pm

I had to deal with the build constraints I had personally. If you can print o-ring grooves they would probably be more reliable and safer.
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Re: Simple Pump Action Design

Unread postAuthor: jean » Wed Oct 05, 2016 11:30 am

Today some orings arrived. Still waiting for the al-pipe.

The orings are 66mmx5mm and 2x2mm in dimension.
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Re: Simple Pump Action Design

Unread postAuthor: jean » Thu Oct 13, 2016 12:42 pm

Hi :)

I got the aluminium tubes and printed the first parts.
Changed the meter in size (6mm diameter to 13mm dia.), also got new orings 7.8mmx2.4mm (insted of 2mmx2mm)
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Re: Simple Pump Action Design

Unread postAuthor: jean » Fri Oct 21, 2016 8:21 am

So yeah redesigned red part and printed in pla. Some parts will be glued together..because of some warping issues i sliced the piece.
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Re: Simple Pump Action Design

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Re: Simple Pump Action Design

Unread postAuthor: Alanstone » Sat Oct 22, 2016 4:15 pm

Hi Jean. Good luck with your project. You say you are printing the parts in pla and then going to glue them together. What glue are you going to use for that?
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Re: Simple Pump Action Design

Unread postAuthor: jean » Sat Oct 22, 2016 9:23 pm

Thanks Alanstone
Glue for PLA is Dichloromethane.
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Re: Simple Pump Action Design

Unread postAuthor: jean » Tue Nov 01, 2016 12:13 pm

Slowly getting in shape.
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Re: Simple Pump Action Design

Unread postAuthor: Alanstone » Tue Nov 01, 2016 1:35 pm

Looking good. It's coming along nicely. I am looking forward to how your project works out.
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