Diffusion Vacuum Pump

Please look up the definition of a Diffusion Vacuum Pump before continuing!

This pump is made from readily available materials and has been shown to achieve a .022 TORR vacuum!!!!

Use extreme caution when working with vacuum

This pump needs a "Roughing" pump to get down to a near vacuum then it will work as described.
No a refrigerator compressor will not work as a "Roughing" Pump for this
No a vacuum cleaner will not work either!

You will need a refrigeration service type pump for the "Roughing" of the vacuum.

Yes you may have to go to IKEA to get some of the parts!

Step 1: Materials

You will need a stainless steel tube (I used an exhaust pipe section)
Some 1/4 inch copper tube and
stainless steel flat sections.

I found that the local scrap yard had lots of stainless steel parts. Selecting the right few took a couple of trips.

You will also need to know how to braze. I used stainless brazing rod for joining all parts.

I used a stainless 2.75 od exhaust pipe adapter for the body. Some scrap stainless flats for the ends.

All cutting was done with a Dremel and cut-off abrasive wheel.

Several Ikea stainless cups were sacrificed for this build!

Comments

[eelco_g]

I'm a bit lost. Some background, a working principle and a schematic would make this a great instructable. Also, could you explain a bit more about the construction? For example in step 6, where does the copper coil come from? It's just there all of a sudden without explanation. Thanks.

[Random_Canadian]

Sorry about that. I got in the zone with the build. The copper tube is a gravity feed cooling apparatus. Wrap 3-4 coils of copper tube around the body of the pump. Braze this tot he body. Water is gravity fed in a steady drip to facilitate cooling of the pump body and allow the pump to cool the heated oil.

[gcr100]

You win a follower with this pump i am making my own but i have a question can i use 2 fridge compresors in series as a mechanical pum i know that the ideal pump is the rotary vanes one, but here in Mexico they are really expensive i know that one can get a vacuum of 100mbar

[rimar2000]

Awesome project!

Surely you can aluminize using this vaccum pump, isn't?

[Random_Canadian]

Thanks!

That is definitely one of the plans!

[rimar2000]

I envy you a bit... Is there something like good envy?

[omnibot]

Yep, called "admiration" and "inspiration".