Oil free air has many advantages: it can eliminate the potential risk of air pollution in the final product, reduce the operating costs of compressed air in the business, and lower maintenance costs. For example, under pipeline blowing and testing pressure, compressed air containing oil may cause hazards such as explosions. Oil free compressed air can minimize the risk of equipment and product damage, without damaging the pipeline system and final product.
Today, let's talk about the types of oil-free air compressors:
1. Oil free screw air compressor
The structure of the oil-free screw air compressor is basically the same as the principle of the oil injected screw air compressor, both of which achieve air compression through the volume change between the rotor and the housing. However, the air and oil circuits of the oil-free screw air compressor are separate. Although the pressurization of the pneumatic circuit is also completed inside the machine head, the rotor is composed of coated male and female screws that can rotate under oil-free conditions. The cooling of the head rotor is achieved by the rotor cooling jacket located inside the casing. The function of the oil circuit is to lubricate the bearings and gears of the air compressor. Effective isolation shaft seals should be used between the lubrication chamber and the compression chamber to prevent entry into the working chamber.
2. Centrifugal air compressor
Undoubtedly, centrifugal air compressors belong to oil-free air compressors. The principle is that the impeller drives the gas to rotate at high speed, producing centrifugal force. Then, through the expansion flow of the impeller, the gas reaches the required pressure. The entire process of suction compression does not come into contact with oil, so centrifugal air compressors belong to oil-free air compressors. Centrifugal air compressors belong to high displacement air compressors and are mostly used in factories or enterprises with high gas consumption, such as large electronic factories, large food processing plants, etc. Due to its high rotational speed, high precision, and high reliability, it requires regular maintenance and upkeep by professionals, which can result in higher costs.
3. Oil free piston air compressor
Oil free piston compressors belong to reciprocating air compressors, and their working principle is the same as that of piston air compressors with oil. One difference is that the crankcase does not have compressor oil, and the other difference is that the surface of the piston also has a layer of coating. The power of this type of air compressor is generally relatively small, and the cylinder cooling is usually done by air cooling, which is mostly used for on-board air compressors on buses.
4. Oil free scroll compressor
The oil-free vortex compressor forms several pairs of crescent shaped closed compression chambers through the meshing of the dynamic and static vortex plates, and compresses the gas with the rotation of the dynamic plates. Smooth operation with low noise. The power of oil-free vortex machines is generally small, with low maintenance costs and low gas production rate. They are mostly used in fields such as food, medicine, electronics, and precision spraying.
Yingke Aier focuses on leasing oil-free air compressors, providing you with fast, reliable, professional, and high-quality compressed air solutions.
