High speed rotary vane air pump. Does it exist?
High speed rotary vane air pump. Does it exist?
(OP)
We have a requirement to move 200scfm of air and be able to achieve 20psig, and must be pos disp. Problem is it needs to be super compact. Looking at centrifugal pumps, that is no biggy at all to spin the hell out of them and get what you need.
In looking at PD pumps, you are really limited to either screw or rotary vane. Weight is another concern but primarily size. I was curious if rotary vane pumps are typically run rather slow or if they can possibly be run at say 5000-10000rpm which could make them a more compact item?
I realize life of the pump, or the vanes anyway, will be largely affected but due to the intermittent application, that would not matter much.
In looking at PD pumps, you are really limited to either screw or rotary vane. Weight is another concern but primarily size. I was curious if rotary vane pumps are typically run rather slow or if they can possibly be run at say 5000-10000rpm which could make them a more compact item?
I realize life of the pump, or the vanes anyway, will be largely affected but due to the intermittent application, that would not matter much.





RE: High speed rotary vane air pump. Does it exist?
RE: High speed rotary vane air pump. Does it exist?
Mike Halloran
Pembroke Pines, FL, USA
RE: High speed rotary vane air pump. Does it exist?
Last job was four years at an industrial air supplier/sales/service and installation company. I'm not an expert and I don't remember all the big screw and vane compressors but there were many, it's been over 14 years but one of the smallest and highest output that I liked was Hydrovane, made in England, I think, and the Ingersoll Rand, Atlas Copco type portables that could do 200+cfm at 100 psi or better all day long with minimal service problems.
I don't understand, or at least, cannot quite grasp your problems. Is there some underlying requirement for specifically a "vane" unit and not a "screw"?
Rod
RE: High speed rotary vane air pump. Does it exist?
For giggles, I was trying to find out what kind of clearances are inside a twin screw SC and all I find is "really tight". Duh, is that 2 tenthou tight, 2thou tight, or 10thou tight? No real need to know but interested I guess how much loss they have since there is no contact inside.
I guess I was also considering the VE to be higher with the vane with little to no loss but high speeds just might not be practical. I seem to find them specced in the 1000-2000rpm range and that would make for a huge pump.
We are looking for a pump that could easily fit in a 1ft cube if that helps.
RE: High speed rotary vane air pump. Does it exist?
RE: High speed rotary vane air pump. Does it exist?
Ted
RE: High speed rotary vane air pump. Does it exist?
RE: High speed rotary vane air pump. Does it exist?
Regarding twin screw, now that it was mentioned, I to recall in a shop that had one running a lot, there was an oil haze in the shop from the oil lube in the compressor. That would probably be an issue however, I have to wonder if, at these pressures, if there would be much loss from a twin screw. I could see it as a growing issue as the pressure delta rises in the case.
Can the twin screws be run dry or do they possibly have contact seals inside that must be lubed?
RE: High speed rotary vane air pump. Does it exist?
There certainly are geared dry running Roots blowers, which is another possibility if you can stand the noise.
Mike Halloran
Pembroke Pines, FL, USA
RE: High speed rotary vane air pump. Does it exist?
RE: High speed rotary vane air pump. Does it exist?
The smallest rotary vane units such as the aforementioned Hydrovane can supply small models but I really doubt anything near your requirements of 200cfm in a one cubic foot dimension. I think the largest vane I can think of that small was a 7 1/2 hp model, just a guess at something like 100cfm @ 90psi...just a guess, mind you.
Can you hook up a small compressor to a large external receiver? That could give you your specified flow rate as long as it is not continuous. Also, what are your requirements for a "dryer"? Any compressor without a receiver capable of anywhere near 200cfm are going to "pump" a lot of water.
Rod
RE: High speed rotary vane air pump. Does it exist?
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You'll have a tough job fitting a 15 HP motor into a cubic foot, let alone a compressor and motor.
RE: High speed rotary vane air pump. Does it exist?
RE: High speed rotary vane air pump. Does it exist?
The twin screws seem to be the closest match right now. HOwever, I am finding industrial screw pumps to run slow and are huge as opposed to supercharger type pumps that seems to spin VERY fast and are smaller. We also need air requirements much like that of an SC being high volume and low pressure.
Are there design differences between these? Can anyone confirm the clearances these pumps operate at between rotor/rotor, or rotor/case? I am not sure what type of filtration is need yet.
RE: High speed rotary vane air pump. Does it exist?
Sorry, I'm still not getting the 'size requirement' thing. As I said, I'm no expert but in that last four years I was around quite a few industrial installations and I must admit I'm still confused as to your requirements/specifications.... Belt drive? Most screws, vanes, Rootes are direct drive, even some of the smaller ones. Certainly 200cfm @ 20psi is within the range of conventional compressors. Remotely mounted? No receiver specs?
Rod
RE: High speed rotary vane air pump. Does it exist?
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Ted
RE: High speed rotary vane air pump. Does it exist?