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vacuum pumps, liquid ring pumps - water usage and sizing

6/9/20       
marius moldovan Member

Website: http://standivarius.com

Hi all

we are cutting on the 5*8 cnc router a thin composite (acp), and so far we have been using 2x double stage 4kw blowers with inverters.
We manged this way taking them from 50Hz to 90Hz, but not using any MDF as the vacuum depth too low. So now switching to a new solution as holding parts should not be any matter of luck (price of acp is 20EUR/m2).

One option we consider is a liquid ring pump that we can buy at a relatively good price (below 500EUR) for the 15hp I get. I expect though a 8gpm (3m3/h) water consumption, which is huge. Is this what you also experience? Do you use other sources of water? What alternatives to this volume do I have?
also, is it complicated this setup with the liquid ring pump?

I found also another pump that is atypical for cnc, namely one for semiconductors (dry pump). it is a combination of 2 pumps, and is doing in excess of 700cfm at very deep vacuum. Anyone tried this type?

on the rotary vane, quite a few people complain about the maintenance costs. I would stay away from them for this reason.

any recommendations are welcome.
thank you

6/11/20       #2: vacuum pumps, liquid ring pumps - w ...
yaakov

water ring ,its best effective/cost
no any maintenance
3 year work perfect
just add float to test water level and electric valve to make auto fill
about water consumption,its not even close to what you wrote
i didn't check exactly but i think about max
2 liter per day

6/11/20       #3: vacuum pumps, liquid ring pumps - w ...
marius moldovan Member

thank you yaakov

I took the numbers for the flow from the manual...
btw, what is your setup? do you reuse water?
I am considering this pump:
https://biehler-equip.com/gb/vacuum-pumps/1072-spi-speck-liquid-vacuum-pump-type-v
h300grds-hp-15.html

but I don't know what other elements would I need. No local specialist in such pumps around here (Romania) so i cannot figure out the correct parts I need. Wiring should be fine (inclusing either inverter of soft started which i have both), but for the water/air circuit it is a bit confusing.
can you take a few photos of you setup and maybe explain in 2-3 lines how it works?

thank you
Marius


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