Other Compressor Types

Sliding vane rotary compressors include a radially slotted rotor that is offset in its housing. Sliding vanes held in the slots trap air as the rotor turns and provides compression as the volume between the vanes changes due to the rotor offset in the housing. Figure 30-17 is an illustration of an oil-flooded sliding vane rotary compressor that demonstrates the compression cycle. Vane compressors offer moderate pressure capability. Over the past few decades, the use of sliding vane compressors has dropped substantially, to the point where they are now rather uncommon.

Oil-free rotary-lobe compressors feature rotating lobes that have an intermeshing profile. Each stage consists of two rotors held within a figure eight-shaped cylinder. As the two rotors intermesh, compression takes place around the perimeter of the rotor as opposed to along the axis.

In axial compressors, a series of axial blades draws in, compresses, and discharges air, continuing along the axis of the compressor. Stationary axial compressors are the type used in very large combustion gas turbines. Axial compressors typically start in capacity at several thousand

Fig. 30-18 Axial Flow Compressor. Source: Compressed Air and Gas Institute
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