Working Principles Of Two-Stage Air Compressors

Now that we have established the basic operating principle of all air compressors, let us address the 2-stage air compressor theory. Unlike single-stage air compressors that typically use a piston or rotary screw to draw air from an external intake and pressurize it once, 2-stage compressors repeat the pressurization of the air they take in twice. Naturally, this means there are two cylinders to store the pressurized air, as well as double the mechanisms to draw air in and pressurize it.

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There are several differences between single-stage and 2-stage compressors. In the single-stage process, air is compressed, used and replenished at the speed with which a single piston or screw can draw in more air and pressurize it. In contrast, 2-stage air compressors work on the principle that after the first stage of pressurization, a second stage of pressurization allows for a higher pressure of stored air. This process is prized by those requiring higher sources of pressurized air, typically above 100 PSI, as well as the quick and continuous replenishment of air.

1. Single-Stage Rotary Screw Air Compressor

A single-stage rotary screw compressor is a type of air compressor that uses one rotating helical screw element to compress air. The screw element is driven by an electric motor.

In some respects, the single-stage rotary screw compressor may be considered as a positive displacement motor as it delivers a fixed volume per revolution. This fixed volume for each rotor is called swept volume (compressed volume). It is the volume, which will be occupied by the gas when the rotor returns to step 1 position.

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Single-stage rotary screw compressors are commonly used in a range of applications, including home and business AC.

2. Two-Stage Rotary Screw Air Compressor

The Two-Stage Compressor is an efficient way to provide compressed air for your tools whenever you need it.

A dual-stage rotary screw compressor is a type of air compressor that uses two rotating helical screw elements to compress air. The screws are typically driven by two electric motors, one for each stage.

The two-stage air compressor is capable of providing a greater volume of compressed air at various pressures, which are desired for most pneumatic applications. In addition, unlike single-stage units, there is no significant pressure fluctuation in their output. The two-stage air compressors best suit a larger air compressor for better performance.

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