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Thread: Homemade vacuum pump

  1. #1
    Senior Member TRYPHON974's Avatar
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    Homemade vacuum pump

    A friend of mine needs a vacuum pump for some research he's doing about "free" energy. Each man hunts his white whale...
    You can order one on EBAY and wait 2 months, or you can build it yourself, or try at least

    I was recently given a fridge compressor. I made is a crude version of a vacuum pump, some kind of mock up to see if it could work.



    First test is encouraging, it goes to -27 inHg (= -0.9 BAR or -13 PSI). The manometer may be a little optimistic.

    https://youtu.be/uLfne-eGp4s

    Second test with a bottle:

    https://www.youtube.com/watch?v=foO-TD-sO-E
    Jack of all trades, master of none.
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  2. #2
    they can pull a serious vacuum on them, if you hook two in series to act as a two stage setup, you can get even more vacuum, but just watch out and have a condenser trap before the pumps. They are a pain to change the oil in and if you suck a bunch of moisture or whatever your trying to pull a vacuum on gets into the compressor, the oil in those are very hygroscopic and love to absorb water, it will also wreak havoc on the internals if left undone. Ive used one of those before for projects as a vacuum pump, and it did work great for degassing stuff, but you still need to worry about that. Thats also why the cheaper ones from HF are so popular when you need a vacuum pump, because they can be drained of oil and refilled pretty easily.

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    Senior Member TRYPHON974's Avatar
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    No HF here .
    I built a compressor with two fridge units 6 years ago and I use it almost everyday. I opened the third tube (the one which is soldered) and put engine oil in it. Never changed the oil. They are much more reliable than they are supposed to be.

    I"ll put a moisture trap, that's a good advice. Can I use a regular filter you use on a compressor or have I to use the " coal cartridge" (dunno the name)? "I'm thinking adding a little tank too act as a damper, have to make some kind of regulation (maybe manual) too.

    It must work once, if it survives then it'll be a part of the family
    Jack of all trades, master of none.
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  4. #4
    I got mine at HF for 99bucks. Another one of the items that doesnt really suck too bad at HF. Is "free energy" code for penis pump? lol
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    Senior Member TRYPHON974's Avatar
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    Quote Originally Posted by jagboy69 View Post
    Is "free energy" code for penis pump? lol
    Do you mean that my vacuum pump sucks?
    Jack of all trades, master of none.
    http://fournaisedupiton.blogspot.com/

  6. #6
    Senior Member TRYPHON974's Avatar
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    I bought a pot ... I should say a pressure chamber. Made some tests, all was good until it reaches -70cmhg (-0,93bar),then it banged! Scared the hell out of me!



    The walls are 1mm stainless steel (18 gauge ). Lesson learned, the pot needs some kind of reinforcement. A steel ring should do the job.
    Jack of all trades, master of none.
    http://fournaisedupiton.blogspot.com/

  7. #7
    Funny you post a photo of a collapsed pressure cooker. I was cruising a goodwill last week and was thinking about buying a pressure cooker to pull a vacuum on for pulling air bubbles from investments. The ones I looked at didnt have glass lids. Thank you for the warning. I guess their strength lies with pressure and not vacuum. I would have never guessed this would happen. Time for a dome and a silicon mat.

    Anyone sucking on a kitchen apparatus and not pooping their pants??

    How about this??? http://www.ebay.com/itm/3-Gal-250mm-...-/361208603786


    This one is even better! comes with a PUMP! http://www.ebay.com/itm/3-Gallon-Vac...id=p5731.m3795 Same pump from HF
    Visit me: WWW.HandcraftedLanterns.com
    "Sometimes by losing a battle you find a new way to win the war"
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  8. #8
    Senior Member TRYPHON974's Avatar
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    Quote Originally Posted by jagboy69 View Post

    This one is even better! comes with a PUMP! http://www.ebay.com/itm/3-Gallon-Vac...id=p5731.m3795 Same pump from HF
    It's a very competitive price!

    The kitchen apparatus I showed may look like a pressure cooker but it's not one, a pressure cooker would stand the vacuum without any problem.
    And no, didn't ruin my pants
    Jack of all trades, master of none.
    http://fournaisedupiton.blogspot.com/

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