Abstract
To determine the extent of pumping action produced by an axial flow compressor at very low pressures, a small ten-stage compressor was tested in series with an oil-sealed rotary piston vacuum pump. The performance of the compressor is similar to that of the Roots blower used in the same manner, except that the region of higher pressure ratios occurs at lower inlet pressures. Ultimate vacuum of 3 × 10−4 mmHg and pressure ratios as high as 70 were obtained at moderate rotor tip velocities. Design features of a high vacuum turbocompressor are outlined and possible use of such machines for high capacity vacuum pumping systems is discussed.
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