When buying air compressors on a daily basis, many companies generally ask many manufacturers for considerations such as power saving and procurement costs. The solutions given by the manufacturers will mention the bipolar compression air compressor. For the two-stage compression screw air compressor, many companies do not understand what it is specifically about. The following is our introduction to the two-stage compression high-efficiency energy-saving air compressor. I hope it will be helpful for you when purchasing an air compressor!
First of all, we want to talk about the introduction of the main engine of the two-stage compression high-efficiency energy-saving air compressor.
1. The main engine adopts a large rotor and low-speed design, containing two independent compression units.
2. The accuracy, reliability and effectiveness of the rotor profile are guaranteed.
3. The first-stage compression rotor and the second-stage compression rotor are combined in one casing, and they are directly driven by helical gears respectively, so that each stage of the rotor can obtain a suitable speed and the compression transmission efficiency is improved.
4. The compression ratio of each stage of compression is precisely designed to reduce the bearing and gear load and extend the life of the main engine.
5. For the oil lubrication system, the compression chamber and the bearing oil supply are separated independently. The compression chamber uses ordinary cleanliness lubricating oil, and the bearing part uses high cleanliness lubricating oil to ensure high reliability of the bearing.
6. The compression ratio of each stage is small, the leakage is smaller, and the volumetric efficiency is high.
7. Under the same power, the load is borne by two heads, the bearing force is small, and the life is longer.
The second is the main engine bearing
The exhaust end adopts a combination of two pairs of cylindrical bearings, which has excellent reliability and extended life under special conditions. Large bearings are used-also have excellent reliability under special conditions. The design service life reaches more than 100,000 hours.
Take the single-stage compression screw air compressor with a rated output pressure of 8 bar as a comparison. The "compression ratio" of the two-stage compression screw air compressor is reduced, which is lower than 40% of the former. The reduction in compression ratio will bring the following advantages:
1. The reflux leakage is reduced, and the output flow of the screw main engine is improved.
2. The compression heat generated during the air compression process is reduced, and the temperature rise in the compression chamber is low, which can improve the volume efficiency of compressed air.
3. The axial force and radial force generated by the rotor are reduced, which can reduce the axial force and radial force borne by the rotor bearing, greatly improving the service life and reliability of the rotor bearing and the rotor.
The last is the two-stage compression process
First, natural air enters the first stage of compression through the air filter, mixes with a small amount of lubricating oil in the compression chamber, and compresses the mixed gas to the interstage pressure. The compressed gas enters the cooling channel and contacts with a large amount of oil mist, which greatly reduces the temperature. The compressed gas after cooling enters the second stage rotor for secondary compression and is compressed to the final exhaust pressure. Finally, it is discharged from the compressor through the exhaust flange to complete the entire compression process.