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<Noxz>
epoxy impreg'd borosilicate microfiber filter is what the edwards oil mist filter states
<Noxz>
also, it appears they have a decently long life and can recirculate/drain fairly easy
<Noxz>
so, may be worth just buying a commercial one
<pie_>
borosilicate microfiber
<pie_>
fancy as fk
<pie_>
thats glaasss
<Noxz>
epoxy impreg'd
<Noxz>
borosilicate fiberglass, more or less, yeah
<Noxz>
the idea of the diaphragm pump backing a vane pump is interesting to a point
<Noxz>
removes condensate and such
<Noxz>
no idea what temp that oil is though, for what else may be pulled out
<sync>
is it really that fancy pie_?
<pie_>
idk
<Noxz>
heh
<sync>
it is technology that is in most household waterfilters
<pie_>
oh.
<pie_>
ok then relatively maybe it isnt that fancy
<Noxz>
some vacuum cleaners too, I bet, for their hepa
<pie_>
but maybe its still overall fancy :O
<Noxz>
one idea was to simply source out vacuum filters
<sync>
ime hepa filters are foams
<Noxz>
I mean,, that's what it is
<Noxz>
from what I read HEPA is only an air throughput/particulate size standard
<Noxz>
I could be wrong though
<sync>
the large area filters could be glass, but I suppose most of them use some kind of fleece
<Noxz>
I find glass fiber hepas
<sync>
sure
<sync>
rotary vanes get hot but not incredibly hot
<sync>
maybe 60°C
<sync>
maybe more, never pointed my thermal camera at one
<Noxz>
the idea on where I was going for that is if the diaphragm backing pump got down to 5 torr or less, what would come over from the oil based on it's temp
<Noxz>
depends what you work on, but certainly water
<sync>
I would not do that
<sync>
it is too much work for no benefit
<sync>
if you want to get rid of the water after the pump sat for a while close the inlet valve and let it pump with the ballast open for a few hours
<sync>
but if you only pump air from a chamber there is not much water that is going to accumulate there
<Noxz>
that seemed to be the main benefit of these 'combo' pumps
<Noxz>
was condensate removal of the vane's oil
<sync>
yes, I have a chemical pump that works like that, but as I said, you should segregate your vacuum pumps to the duties they will serve
<sync>
if you pump a lot of solvents a membrane pump is useful
<sync>
if not, you just waste power
<Noxz>
I will be, on the chemistry side of things
<Noxz>
there is a DC pump available that can slow down (use less power) when higher vacuum is attained
<Noxz>
that's an idea..
<pie_>
INFINITE POWERRR
<sync>
or you just use a vfd
<sync>
all my rotary vane pumps have 3 phase motors, I threw the capacitor motors away nobody needs those
<Noxz>
heh
<Noxz>
simple enough to replace the motors
<Noxz>
would the oil need a certain RPM though?
<Noxz>
I can imagine the seal breaking from oil sliding out of place if too slow
<sync>
not really
<sync>
the pumps at work are programmed to run at 15Hz at the low end
<sync>
I have not done this at home tho because you need an adequate buffer volume or the pressure controller oscillates a lot
<Noxz>
ah
<pie_>
is there such a thing as a "wave pump"? just some random asspull idea i just had, where you put a valve in the antinode of a standing wave or something like that
<pie_>
doesnt look like anyone ever used it though
<Noxz>
if I use the vane pump for chemistry stuffs as well, then the chemically resistant diaphragm would be beneficial..
<Noxz>
as a backing pump though? like the one thing ti would do is ismply minimize oil changes
<Noxz>
a good oil mist filter still wanted at the input side
<sync>
well, oil filters only work so well
<Noxz>
right :/
<pie_>
dry pumps 4 life :x
<sync>
only if you cycle them rarely
<Noxz>
all I know is I am getting a somewhat decent vane pump... and I still want to do chemistry stuffs
<sync>
just get another one
<Noxz>
vane?
<Noxz>
diaphragm?
<Noxz>
and dont mix it with the vane?
<Noxz>
the idea there is if the SEM/mass spec/WHATEVER.. the vane pump, would benefit from the diaphragm, and wont harm the chamitry experiments, why not just rig them together to make less maintenance on the vane
<sync>
meh, you still don't get the point it seems
<pie_>
sync, try capital letters :D
<Noxz>
my point is wanting to get low pressure for chemistry stuff.. you say to get another pump... but I also want to have low maint on the diaphragm pump if I can, thus maybe requiring another pump.. I don't want two fo the same pump
<Noxz>
I understand ifI need to, but I just don't want to
<Noxz>
money money
<sync>
they are cheap tho
<sync>
but yes, you need a separate pump for actual high vacuum work instead of chemistry work
<sync>
vane pumps are quite low maintainance, most people just run them until they don't pump anymore
<Noxz>
hrrmm
<Noxz>
I think I also want the benefit of super low vac of the vane for chem
<Noxz>
like, I need under 10 torr for some distillations.. and the pumps I am looking at are started at ~2torr... but really, not sure if that is easily achievable or a broken ebay find or what
<Noxz>
getting sub 1 torr via a vane pump is simple
<Noxz>
the one I am getting gets 1-2 mtorr
<Noxz>
having more leeway, and making a controller for set pressure on the chemistry side of things, seems like a better route
<sync>
I mean even a 50$ single stage vane will do that
<Noxz>
but then you should add a oil mist filter so you dont get oil in your borosilicate glass
<Noxz>
backsplash
<Noxz>
it's also not very resistant
<sync>
you would be suprised
<sync>
they are not really worse than any other pump
<sync>
they might not be able to cope with the massflow you want, but leybold d8 are very cheap
<Noxz>
cheap is relative
<Noxz>
the 3 phase + VFD is rather interesting
<Noxz>
a simple 1/3 HP single phase GE motor on it currently
<Noxz>
even sticking a 3 phase ac +VFD on a diaphragm would be interesting
<sync>
on a diaphragm it is much less interesting imho because the suckage is much less constant
<sync>
you could however speed it up during exhaust and slow it down during intake
<Noxz>
that sounds a bit more complicated for the motor to do
<Noxz>
especially if more than 1 stage
<Noxz>
(I'm looking at 2 and 3 stage ones, and my current hacky setup is 2)
<sync>
well, a diaphragm is usually just one wobl stage
<sync>
you need an encoder to know the shaft position, yes
<sync>
I only use 3 phase motors because I refuse to use dc motors in 2017 :D
<Noxz>
what's wrong with DC?
<Noxz>
single phase AC is what I woud pick out
<Noxz>
DC is at least fairly variable/easy to operate
<Noxz>
and has constant torque
<sync>
so has 3 phase with FOC
<Noxz>
alright, but what's so bad about DC?
<Noxz>
lots of places really like DC because there isn't RF generated like with AC
<sync>
dc has brushes unless it is a bell shaped armature motor
<Noxz>
there's perm magnets on rotor, design, so brushless
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<sync>
well, yes, bldc is still a 3 phase motor tho
<Noxz>
is it? hrrmm
<sync>
it has to be
<Noxz>
so.. nothing against bldc? or... ?
<sync>
yes, bldcs are glorious
<Noxz>
ahh
<Noxz>
just checking ;)
<sync>
but usually overkill for simple jobs like that