Two screws in a rotary screw compressor are used to com […]
Two screws in a rotary screw compressor are used to compress the gas. Works by driving a set of screws on a synchronous gear. Basically, it works by reducing the gap between threads to compress the gas. The gas is then discharged through the end of the screw.
This mechanism is only as effective as the gap between the rotors (called the spiral) and sealing the open or compression cavity.
Rotary screw compressors do not require spring suspension due to their compact design and smooth operation, and they do not have any vibration. In short, this reduces maintenance and noise. In fact, many models have elastomeric vibration isolation mounts to absorb vibrations, especially those that operate at high speeds.
Although you can find consumer-level models, they are often used in business environments, that is, models based on general industrial applications. They are often used to power heavy construction machinery.
Many people want to know what is the difference between oil-free compressors and oil-filled compressors. Oil-free models are only inflated by compressed air with the help of screws without the help of an oil seal. These devices typically have lower psi emissions and are more suitable for low-end operations or consumer-grade models. There are other oil-free devices that can produce large psi, with output exceeding 2,000 cubic feet per minute. These units have multi-stage screw sets. Although they are oil-free, they are not pollution-free machines and still require filtration as hydrocarbons and other pollutants enter the outside air.
Oil immersed rotary screw compressors have higher compressed air psi. To seal and provide cooling for aeration, the oil injection unit injects oil into the cavity, although it separates from the discharge stream when cooled. It is then filtered and recycled back into the unit. To counteract the effects of oil passing through air pressure, there are two solutions: one is a filter or coalescing container. Another way to catch leaking oil is to condense the oil and discharge the airflow through the condensate management equipment. A basic oil-filled compressor can reach a pressure of 1500 cubic feet per minute.
On most models, you can find a variable speed drive that regulates air flow.
Another such rotating unit is called a supercharger. The advantages of this model over typical roots-type units are low leakage levels and low parasitic losses.
Screw barrel of injection moulding machine
