AIR COMPRESSORSDOE-HDBK-1018/2-93Miscellaneous Mechanical ComponentsRotaryCompressorsThe rotary compressor is adaptable to direct drive by induction motors or multicylinder gasolineor diesel engines. The units are compact, relatively inexpensive, and require a minimum ofoperating attention and maintenance. They occupy a fraction of the space and weight of areciprocating machine of equivalent capacity. Rotary compressor units are classified into threegeneral groups, slide vane-type, lobe-type, and liquid seal ring-type.The rotary slide vane-type, as illustrated in Figure 3, has longitudinal vanes, sliding radially ina slotted rotor mounted eccentrically in a cylinder. The centrifugal force carries the slidingvanes against the cylindrical case with the vanes forming a number of individual longitudinalcells in the eccentric annulus between the case and rotor. The suction port is located where thelongitudinal cells are largest. The size of each cell is reduced by the eccentricity of the rotoras the vanes approach the discharge port, thus compressing the air.Figure 3 Rotary Slide Vane Air CompressorME-05Rev. 0Page 4
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