Rotary screw air compressors have some meshing spiral screws known as rotors to compress the input air. Whereas reciprocating air compressors use pistons touched by a shaft for compressing the air.
With simply 2 moving elements (screws) that have a little gap between them, screw air compressors aren’t subject to abundant wear and tear. Even in models wherever the 2 screws are available contact with one another, they don’t encounter any friction, that is why they’re less possible to interrupt down.
On the opposite hand, reciprocatory air compressors have many moving elements like pistons, piston rings, connecting rods, and inlet-outlet valves. Thanks to that they’re noisier and should want stocking of spares.
The internal heat made by screw air compressors throughout operation is between eighty – ninety nine degrees Celsius . The warmth production is restricted, as there’s no friction between the screws. The oil or stuff used between the rotors and casing creates a non-wearing seal that may eliminate the warmth with the assistance of a thermostatically managed fluid circuit.
In reciprocal air compressors, the pistons operate at temperatures between 150-200 degrees Celsius. The high temperatures square measure because of the friction caused by the movement of piston rings against the cylinder walls.
The chances of finding oil in associate with an oil-lubricated screw air compressor are terribly low, as a result of this unit encompasses a three-stage oil filtration system. The oil content is often below 3 particles per million (PPM).
However, a reciprocating compressor doesn’t have associate oil filtration system, that is why, its outlet air will be additional contaminated than a screw compressor. The oil content within the air additionally will increase once piston rings and oil rings deteriorate, permitting oil to maneuver up to the compression aspect.
It’s typically difficult to decide on the acceptable size of air-receiver tank after you use a rotary screw compressor, as most of the associated applications don’t need a tank the least bit. This unit is devised to deliver a continuing stream of compressed air with none disruption or pulsation. If the air flow demand of your tool is a smaller amount than what’s created by the compressor, then you wouldn’t need a tank the least bit.
On the opposite hand, piston-based compressors go together with air-receiver tanks during which they store air and take away pulsation before it runs the connected applications. Once the tank is full, one will operate the instrumentality.