LuckyWinner - 22-2-2019 at 09:05
whats your experience with this specific 'chinese made rotary Vane Vacuum Pumps'
reference amazon search 'rotary vane vacuum pump'
usually comes with these specs:
3CFM
5PA
1/4 HP
250ml oil
can these pumps achieve a steady vacuum over 2 hours at once and work for 2 months till they break?
these are my requirements.
-what vacuum are you able to achieve with these rotary vanes? (mmHg)
asking cause you cant trust chinese data
(there are threads about this topic here but they are all several years old)
Ubya - 22-2-2019 at 09:52
i have this model of pump, single stage, 5Pa max vacuum, 1/3HP price 60€. i don't have a vacuum gauge yet but i can assure you that it can pull a
vacuum (i made a crt with it). it gets hot after a while, i never used it for more than 10 minutes ( just to evacuate a 1L bottle not bigger volumes),
if you are going to run it for hours maybe a second fan is necessary, or maybe after it pulled most of the air the work is less so the heat is less.
AvBaeyer - 22-2-2019 at 19:06
I have a pump essentially identical to the one pictured above. It is used for many vacuum distillations and will consistently pull 0.2 - 0.3 mm Hg. I
have to bleed it in order not to have too much vacuum. It does run a bit hot but I have run it for as much as 1.5 hr with no problem. The oil is
changed religiously and I am careful not to pull volatiles into the pump. It is really a good value pump for the home lab.
AvB
Jayko - 26-2-2019 at 10:59
i have also the same pump since about a year and its better than i thought. i used it once for more than 2 days and it worked perfectly fine. The only
thing i did is to strap 2 old pc fans to the hot parts and thats it.