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Basic air compressor system

LEARN BASIC AIR COMPRESSOR SYSTEM

GIA MAY NEN KHI – MAY SAY KHI, PHU TUNG | SHAFT COMPRESSOR, HITACHI AIR COMPRESSOR, OIL FREE AIR COMPRESSOR, SALE OLD AIR COMPRESSOR

Air compressors are machines (mechanical systems) that increase the pressure of a gas. The use of air compressors is many, they are present in most industries such as printing, packaging, food, textiles, wood, … Air compressors are an important “link” in the systems. Industry uses high-pressure gas to operate other machines …

LEARN BASIC AIR COMPRESSOR SYSTEM

 

GIA MAY NEN KHI – MAY SAY KHI, PHU TUNG | HITACHI AIR COMPRESSOR, HITACHI AIR COMPRESSOR, OIL FREE AIR COMPRESSOR, SALE OLD AIR COMPRESSOR

Screw air compressors are commonly found in factories
Screw air compressors use a circular motion of a screw using 2 bolts that are connected to 2 screws that press air into a smaller volume with a large power range from 7.5kw (10HP) – 240 kW (300HP).

 

A complete air compressor system will include: Air compressor → Accumulator → Air dryer → Filter → compressed air consumption device. The system diagram is shown below

The effects of each device in the system are briefly described as follows:

– Air compressors: create compressed air with the flow and pressure required by the customer. Oil-based compressors are used for mechanical manufacturing in general and oil-free air compressors are applied in clean technology such as food, medicine, beer, electronic alcohol …

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The structure of the screw air compressor is shown below:

Construction of screw air compressors (enlargement)

The working principle of screw air compressors is shown in the figure below:

Working principle of screw air compressors (enlargement)

Model of pneumatic path in screw air compressors

Basic quantities of the compressed air system:

+) Capacity (Capacity) of compressed air is usually calculated in units of liter / min, m3 / min, CFM, Nm3 / min. . . With the following formula:

1 m3 / minute = 1000 liters / minute

1 m3 / min = 1,089 x 1 Nm3 / min

1 CFM = 0.0283 m3 / min

+) Compressed air pressure is usually calculated in units of Mpa (Megapascal), bar, kgf / cm2, psi, atm … With the converted formula as follows:

1 Mpa = 10 bar

1 atm pressure = 1,01325bar

1 bar = 14,5038 psi

1 bar = 1.0215 kgf / cm2

+) Power (Power) of air compressors is usually calculated in Kw or HP (horse power) with the converted formula as follows:

1kw = 1.35 HP

Currently on the market air compressors can be divided into four main categories:

Oil-free piston compressors and oil-free Piston compressors:

Oil-free screw compressors and oil-free screw compressors:

High pressure air compressor

Turbo large air compressor

Portable air compressor

– Pressure tank: Normally, when the compressor starts working, it cannot immediately meet the required pressure of production (For example, the factory needs compressed air with a pressure of 8 bar to control a certain device. ) that the compressor has to run for a while (usually about 1-2 minutes) to reach a pressure of 8 bar so if there is no accumulator, there will be a certain delay in control. Thus, it can be said that the accumulator acts as a storage place for compressed air to meet production needs and also to partially separate the water in the compressed air and to reduce the temperature of the compressed air before the gas goes. into the air dryer. When the compressor stores enough pressure on the accumulator, it will either stop the engine or run in idle mode depending on the installation.

The size of the accumulator will depend on the technology of each plant.

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– Air dryer: has the effect of drying compressed air by water manipulation. Currently on the market, there are two types of dryers, which are (1) the water separator dryer according to the principle of compressed air cooling to condense water, (2) the water-separating dryer according to the principle of absorbing water through the absorbent particles. .

The structure of the air dryer is shown below:

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