Low pressure ratio, high flow compressor (Blower?)

[chuckago]

I am new to the compressor world (and this list) and think I may be looking for something that falls in between many of the standard designs out there. I need to compress helium from 1 atm to 1.1 atm at a flow rate of 300 l/m. The gas starts at room temperature and the pressure ratio might need to go up or down a bit. The system needs to be clean and sealed, and I would like something that has a high thermodynamic efficiency. At first I thought a centrifugal blower would be the right design, but they tend to move ten times as much gas for the smallest models. Any suggestions would be appreciated.

Thanks in advance

 

[crjones]

Look at a positive displacement straight blower, commonly called a Roots style.

 

[dcasto]

at bthose ratios and small voume, don't worry about efficiency, put you money in a unit that has no seals. A hemetically seal air conditioner type compressor would work.

 

[sreid]

http://www.pfeiffer-vacuum.com/cnt/en/378/