Distinctive Varieties of Air Compressors

An air Compressor is one of the main energy consuming utilities in any industrial operation and are mostly classified in two sorts. The classification is depending on their building and operation options.

The two most important classification of Air Compressor are:

01) Good Displacement Kind

02) Dynamic Variety.

You'll discover details of every single variety from beneath description.

01) Constructive Displacement Variety Air Compressor.

Positive displacement varieties compressor are those, who mechanically displace a fixed volume of air into a reduced volume. The continual volume is usually delivered by compressor when operated at fixed speed. The discharge pressure is determined by the method load situations. In the event the consumption of air is a lot more, then discharge stress falls under the cut-off pressure & compressor works on load condition.

This varieties of Air Compressor further classified as

A) Reciprocating Air Compressor.

In this form, compressed air is generated by to & fro movement of piston inside the cylinder(compression chamber). Every single movement compresses a fixed quantity of free air at a specific stress. Single stage, double stage or multiple stage and single acting or double acting is the further classification of Reciprocating Air Compressor. A Vertical kind Air Compressor is use for the application of compressed air ranging in between 50 to 150 c. f. m and the Horizontal balance kind is most suitable for application ranging from 200 to 5000 c. f. m.

B) Rotary Air Compressor.

In this variety, air is compressed by two rotating or inter meshing rotors. According to the sort of building Rotary Compressor may be further classified as (a) Rotary Screw Compressor (b) Rotary Vane compressor.

(a) Rotary Screw Compressor.

Air is compressed between two rotating screw (male & female screw) and casing. The compression took place in gradually reducing space between these two parts.

(b) Rotary Vane compressor.

Air is compressed between casing & rotating rotor by the help of movable rotor blade. This sort of Air Compressor can be further classified as Single Stage or Double Stage Rotary Air Compressor.

02) Dynamic Variety Air Compressor.

The Dynamic Variety Air Compressors mechanically impart velocity to the air. This action is produced by the Impellers rotating at a high speed, in enclosed casing. The air is forced into a progressively reduced volume. The volumetric flow will vary inversely with the differential stress across the compressor.

This type of compressor is further classified as (a) Centrifugal Air Compressor (b) Axial Flow Air Compressor (c) Roots Blower Compressor.

(a) Centrifugal Air Compressor.

In a Centrifugal Air Compressor, an Impeller is mounted on a shaft and positioned within housing, consisting of an inlet duct, a volute and a Diffuser. The velocity to the air can be impart by the high speed rotation of Impeller. The Diffuser surrounds the Impeller and act to convert the Kinetic energy of air into potential power at a higher stress level.

(b) Axial Flow Air Compressor.

The Axial Flow Type Air Compressor is essentially a large capacity, high speed machine with characteristics quite distinctive from the centrifugal air compressor. Every stage consist of two row of blades, one row rotating & the next row of blade is stationery. The rotor blades impart velocity and stress to the air as the motor turns, the velocity being converted to stress in stationery blades.

(c) Roots Blower Compressor.

This type is generally called as blower. The discharge air pressure obtained from this type of machine is very low. The Discharge Stress of 1 bar is often obtained in Single Stage and stress of 2. 2 bar is obtained from Double Stage. The discharge pressure achieved by two rotors which have separate parallel axis and rotate in opposite directions. This is the example of Positive Displacement Compressor in Rotary Kind Air Compressor.

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