Fixed Vane Type Compressors
These compressors belong to the category of positive displacement type as compression is achieved by reducing the volume of the gas. In this type of compressors, the rotating shaft of the roller has its axis of rotation that matches with the centre line of the cylinder; however, it is eccentric with respect to the roller as shown in Figure 10.7. This eccentricity of the shaft with respect to the roller creates suction and compression of the gas. A single vane or blade is positioned in the non-rotating cylindrical block. The rotating motion of the roller causes a reciprocating motion of the single vane.
Figure 10.7 Fixed Vane Type Rotary Compressor
This type of compressor does not require a suction valve but requires a discharge valve. The leakage is controlled through hydrodynamic sealing and matching between the mating components. The effectiveness of the sealing depends on the clearance, compressor speed, surface finish, and oil viscosity. Close tolerances and good surface finishing is required to minimize internal leakage.
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