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/diy/ - Do It Yourself

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1788918 No.1788918 [Reply] [Original]

I've read I can make my own vscume pump for a diy Büchner flask by taking apart a fridge.

I have had this old one in my back yard for over a year.im hoping I can still salvage the correct parts.

How do I do it safely tho I've read it can be dangerous taking apart a fridge ?

>> No.1788952

>>1788918
>isobutane
Whatever you do, don’t light a match....

>> No.1788990

>>1788918
I've done this, it works well but the fridge pumps are designed to be a close loop so all the oil inside the compressor will eventually shoot out the pressure side and your pump will eventually seize, you could occasionally suck up oil from the vacuum side to refill it, but you truly have no idea how much oil is in the system so it's all a guess.
Also, oil changes are a guess as well, with what the level currently is, and how much you need to add.
Just buy a chinese vacuum pump and use that, I also recommend using a drying bottle between the pump and the flask, a bottle with a tube going to the bottom, and a hose that goes out the top, that way if you suck up any moisture or chemicals it will be trapped in the dessicant or whatever material you fill the bottle with.
Another option, if you're dealing with very nasty chemicals like acids or something corrosive/flammable/dangerous, get a rotary vane pump from a carbonator or some such, and use an aspirator in a loop system, I know someone who has done this with success to vacuum distill some acids.
This method allows you to protect yourself and your equipment from acid damage.

>> No.1789108

>>1788990
Thanks for that info I think I'll just take your advice and buy a cheap vacume pump then.

With me saying that tho do you think it's still worth maybe dismantling tjismold fridge before.binning it.

I'm no diy/engineer (I am in construction tho) but would like to start fucking about with a few things when I have some more money to buy some tools

>> No.1789115

>>1789108
Yeah take the compressor out and have fun with it, I know someone who linked like 3 ac compressors together to fill up his compressed air tank and he ran power tools off it, but you need an unloader otherwise the motors wont have enough torque to restart with all the pressure on the tiny pistons in the compressor.
They work good for what they are, free compressors/vacuum pumps.
But yeah I'd just cut one of the lines into the compressor, I've done it a few times with a sawzall and it sprayed oil and refrigerant in my face but I'm not a pussy so it didnt really phase me.
Apparently >>1788952 says that shit is flammable so be aware of that I guess.