A rotary compressor is like a car engine, with pistons, rods, sleeves, valves, etc. A screw compressor has two screw type rotating parts that squeeze the refrigerant as the screw threads get tighter and tighter. They have long life potential.
Rotary screw compressors are used in many industrial compressed air systems due to the high volume they produce in comparison to reciprocating compressors. Rotary screws take up much less space, require no heavy flywheels, and need less maintenance than the recip. compressors. Oil free compressed air can be produced by large rotary screw compressors designed as such, while reciprocating compressors can do this only on a smaller scale due to the need for cylinder lubrication in the larger models.
It depends on the requirement. Both are good types of compressor in the right application. Centrifugal compressors are designed to supply a high capacity and continuous flow of air. The screw compressor, also known as a rotary screw compressor supplies a lower capacity, high output compressor that provides a pulse-free continuous flow of air.
Helical gear and screw pump are often interchangeable designations for a rotary positive displacement pump that moves fluids. In a single screw helical gear pump the gear looks like a screw and fits tightly into the casing in order to move the fluid axially along the screw. In a multiple screw helical gear pump two or more "gears" or screws intermesh with one another to pump a fluid axially or radially through the pump.
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