![]() The screw compressors are efficient in low air pressure requirements. The rotary compressors are classified into screw type, vane type-lobe type, scroll type and other types. Instead, these compressors have screws, vanes, scrolls, and other devices which rotate and thus compress air. These compressors are not of reciprocating nature, therefore does not have any pistons and crankshaft. Thus both sides of the pistons are effectively used in compressing the air. The compressed air delivery is comparatively continuous when compared to a single-acting air compressor. The intake and delivery valves operate corresponding to the stroke of the compressor. As the piston moves up and down, both sides of the piston is utilized in compressing the air. These compressors are having two sets of suction/intake and delivery valves on both sides of the piston. The bottom of the piston is open to crankcase and not utilized for the compression of air. The air is compressed only on the top part of the piston. The other end of the piston is often free or open which does not perform any work. These are usually reciprocating compressors, which has piston working on air only in one direction. Better torque and balancing is achieved by displacing the units by certain angle. Higher capacity compressors are water cooled. The compressor has different units displaced usually by 90 degrees, may or may not be connected to same crank pin on the crank shaft. These are usually air cooled compressors with concentric valves mounted on each cylinder head unit. Refer the attached diagram of the reciprocating in-line compressors. These compressors are commonly direct driven by electric motors or diesel engines. The cylinders of various stages are found in a straight line when seen from top. These are simple in design with almost very little automation. These are most commonly used compressors with varying pressure ranges. The Attached picture shows the clear classification of different types of compressors.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |