There are various forms of air compressors. The earliest developed and most widely used is the reciprocating piston compressor. With the development in recent years, screw air compressors have gradually replaced piston compressors in society because screw air compressors have special features.
The unique lubrication method of the screw compressor has the following advantages: its own pressure difference allows it to inject coolant into the compression chamber and bearings, simplifying the complex mechanical structure; injecting coolant can form a liquid film between the rotors, and the auxiliary rotor can be directly driven by the main rotor; the injected coolant can increase the airtight effect, reduce noise, and can also absorb a large amount of compression heat. Therefore, the screw air compressor has the advantages of small vibration, no need to fix it on the foundation with anchor bolts, low motor power, low noise, high efficiency, stable exhaust pressure, and no wearing parts.
There are certain faults in the piston compressor, and the piston rings and packing devices do not require oil lubrication. Under normal circumstances, the compressed gas is basically pure and contains no oil. However, because the oil scraper ring often does not scrape the oil completely and the seal is not good, oil often runs onto the packing device and even the piston ring, causing the compressed gas to contain oil. In addition, the exhaust temperature is high, sometimes as high as 200°C; the cooler is clogged, resulting in poor cooling effect; the piston ring is stained with oil and is particularly prone to wear; the valve flap is leaking; the cylinder liner is worn, etc.
Screw air compressors have few faults. As long as the oil and gas separator, air and oil filters, etc. are regularly maintained, their normal operation can be guaranteed. The two 10m3 screw machines used had maintenance problems other than maintenance, including blocked sewage pipes and faulty control panels. Over the past two years, the host system has been operating normally.
Therefore, from the perspective of use effects, performance, machine maintenance costs, etc., screw compressors have unparalleled advantages over piston air compressors. They not only reduce the labor intensity of operators, but also eliminate the need for maintenance workers, which greatly reduces maintenance costs. On the other hand, when using a piston machine, the exhaust pressure will occasionally be too low, causing the ion membrane control system to alarm. After switching to a screw machine, the exhaust pressure is set at 0.58MPa, and the pressure remains stable, so it is safe and noise-free.
Post time: Feb-28-2025
