An air compressor is a device that compresses air. Because the compressed air can withstand high temperatures and radiation, air compressors are used in various industries. Common applications include general manufacturing, medical, machinery, pharmaceutical, chemical, and metallurgical industries. So, what are the main types of air compressors, and what are their characteristics? This article will analyze them one by one.
I. Classification of Air Compressors
Because air compressors are often used in different industries and scenarios, they are classified according to different dimensions. The following are some common classifications.
1. According to the operating principle of air compressors: they can be divided into rotary screw air compressors, centrifugal compressors, and reciprocating air compressors.
2. According to the lubrication method: they can be divided into oil-injected screw-compressor.html and oil-free screw air compressors.
3. According to the compressed gas:compressors can be divided into air compressors, oxygen compressors, natural gas compressors and ammonia compressors.
4. According to the number of compressions: compressors can be divided into single-compression compressors, double-compression compressors, and multi-compression compressors.
5. According to the method of gas compression: positive displacement air compressors and dynamic air compressors. Positive displacement air compressors can be further divided into reciprocating (piston, rotary), vane, screw, and rotary types. Dynamic air compressors can be divided into centrifugal compressors and axial compressors.
6. According to the pressure level
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Working Pressure
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Name
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0.3-1.0MPa
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Medium Pressure Compressor
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1.0-10Mpa
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High Pressure Compressor
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10.0-100Mpa
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Ultra High Pressure Compressor
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II. Characteristics of Common Air Compressors
1. Oil-injected screw air compressor: Oil-injected screw air compressors need to reduce the heat generated during operation. Because they directly use lubricating oil, the temperature is lowered during compression, thus improving the efficiency of compressed air. The lubricating oil also increases the compression ratio of each stage. Furthermore, oil-injected screw air compressors can achieve high efficiency at low speeds, with low vibration and low noise. They are suitable for most industries. If the purchased air compressor is a variable frequency type, appropriate capacity adjustment can be selected for efficient operation, saving energy for the company's production.
2. Oil-free screw air compressor: As the name suggests, an oil-free screw air compressor does not use lubricating oil. Its biggest advantage is the cleanliness of the compressed air. It is suitable for industries such as medical equipment, pharmaceuticals, electronics, textiles, food, beverages, and semiconductors. It also features convenient maintenance and repair, low vibration, high efficiency and energy saving, and wide applicability.
3. Centrifugal Air Compressor: A centrifugal air compressor uses an impeller to drive the gas at high speed, generating centrifugal force. Due to the diffusion flow of the gas within the impeller, the velocity and pressure of the gas after passing through the impeller are increased, continuously producing compressed air. Centrifugal air compressors are velocity compressors, and they operate stably and reliably when the gas load is stable. They also feature a compact structure, light weight, a wide range of discharge capacities, few vulnerable parts, reliable operation, long service life, exhaust gas unaffected by lubricating oil contamination, high air quality, and high efficiency at large discharge capacities, thus contributing to energy conservation.
4. Features of scroll compressorsThe scroll compressor has a novel and precise structure, and has the advantages of small size, low noise, light weight, low vibration, low energy consumption, long service life, continuous and stable air delivery, reliable operation, and clean air source. It is known as the "new revolutionary compressor" and "maintenance-free compressor". It is an ideal power source for pneumatic machinery and is widely used in industries such as industry, agriculture, transportation, medical equipment, food decoration and textiles, as well as other occasions that require compressed air.
