[R-390] Vacuum pumps

Tue, 3 Jun 2003 15:25:57 -0700

OK, so my bubbler scheme should work for the odd and very intermittent kind
of vacuum sourcing that my wife can find so many uses for around the
house....and probably for the rest of my life.

BTW, it was an old Gibson freezer, better than a Frigidaire! <G>

Thanks for the reality check.

Bob

-----Original Message-----
From: Constanten, Carl P. [mailto:[email protected]]
Sent: Tuesday, June 03, 2003 3:01 PM
To: Bob Tetrault
Subject: RE: [R-390] Vacuum pumps

Bob --

Many years ago I used Frigidaire compressors out of old refrigerators as
vacuum pumps. Used them for quite months on high school science projects,
etc. without worrying about oiling and had zero problems. If you have the
Frigidaire-manufactured compressor, unless you're thinking of 24/7 type use,
I personally wouldn't worry too much about it.

73,

Carl W6UO

-----Original Message-----
From: Bob Tetrault [mailto:[email protected]]
Sent: Tuesday, June 03, 2003 1:10 PM
To: [email protected]
Subject: [R-390] Vacuum pumps

Guys,

This is off-topic, and I won't joke about wanting to purge the rebuilt
ballast tube...

I salvaged a compressor out of a bent-up freezer and quickly found that it
is capable of high vacuum. But it also has/had compressor oil circulating
along with the refrigerant and here's the question: Does anyone have any
idea how/where I can get some type of oiling working with this? Right now
I'm thinking of a bubbler set-up at the input and the exhaust. The input
bubbler would promote suspension of oil vapor and the exhaust bubbler would
serve as a collector. When exhaust is full and the input is empty I would
switch 'em. The problem with this set-up is that the initial purge with it's
high air flow flow rate would have the highest oiling rate but the long term
operation towards high vacuum would be comparatively oil starved. Any ideas?

Are there oiling systems for vacuum? Where?

Sucking air in Portland, OR

Bob

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