An air compressor is a device that creates and moves pressurized air at various speeds to enable jobs, applications, and functions to be performed faster, more efficiently, more easily, and at lower costs. The devices are used in a broad range of major industries such as manufacturing, semiconductors, food and beverage, healthcare, home appliances, energy, and oil and gas.
Pressured air can provide
In the compressed air industry, one of the most important dynamics is the use of
Rotary Screw: Rotary screw air compressors use rotary-type, circular movement to compress the air. Capable of running continuously – they don’t need to be shut on and off -- these are one of the most popular types of compressors in many industries.
Piston (Reciprocating) Compressor: The conventional piston compressor, one of the most widely used, has five key parts: a crankshaft, connecting rod, piston, cylinder, and valve head. The valve head holds thin metal flaps, the inlet and discharge valves, at the apex of the cylinder. One is mounted underneath and the other above the valve plate. As the piston moves down, a vacuum is created above it, allowing outside air at atmospheric pressure to push open the inlet valve and fill the area above the piston. As the piston moves up, the air above it compresses, holds the inlet valve shut and pushes the discharge valve open. The air moves from the discharge port to the tank. With each stroke, more air enters the tank and the pressure rises.
Scroll Compressor: This type of air compressor, usually oil-free, works in a circular motion. A single spiral-shaped rotor oscillates against a
Centrifugal Compressor: For this compressor type, air gets drawn into the center of a rotating impeller with radial blades by centrifugal force. This movement of air raises pressure and spawns kinetic energy. Before the air is led into the center of the impeller, the kinetic energy turns into pressure by passing through a diffuser.
Tooth Compressors: The compression element in a tooth compressor consists of two rotors that rotate in opposite directions inside a compression chamber. During the intake phase, air is drawn into the compression chamber until the rotors block the inlet. Next, the drawn-in air is compressed in the compression chamber, which shrinks as the rotors rotate. One of the rotors blocks the outlet port during compression, while the inlet is open to draw in new air into the opposite section of the compression chamber. When one of the rotors opens the outlet port, the compressed air is forced out of the compression chamber.
Vane Compressor: The vane compressor, commonly oil-lubricated compressors, are usually manufactured with special cast alloys. The rotary vane compressor contains a cylindrical rotor placed inside a cavity or housing. The rotor also has a few grooves or slots where vanes are placed. The rotor is intentionally located where it almost comes into contact with the housing in which it is encased. Through
Compressors can be either fixed-speed or variable-speed drive (VSD). The latter automatically changes its motor speed to the air demand. By contrast, fixed speed compressors function at either full throttle on or off.
Air compressors are either single-stage or two-stage devices. The primary difference is the number of times air gets compressed between the inlet valve and the nozzle: