How Oil-Injected Low-Pressure Rotary Screw Compressors Work & Their Industrial Applications

Oil-injected low-pressure rotary screw air compressors play a vital role in modern industry due to their efficiency, durability, and ability to deliver consistent compressed air supply. Understanding the low-pressure oil-injected screw compressor working principle, its applications, and the benefits of low-pressure screw compressors can help industries select the right equipment for their needs.

How Does a Low-Pressure Oil-Injected Compressor Work?

A low-pressure oil-injected rotary screw compressor is a type of positive displacement machine that uses two interlocking rotors to compress air. The main moving parts—the male and female rotors—trap air in the compression chambers. As the rotors turn, the volume of trapped air reduces, increasing pressure.

Oil is injected directly into the chambers to provide lubricating and sealing functions. The oil also helps with cooling, making the compressor more reliable under continuous duty. The injected oil is later separated from the compressed air in an oil separator, ensuring high-quality air output.

The air intake is controlled by an inlet valve, regulating the flow into the compressor. Many modern systems feature variable speed drive (VSD) technology, which adjusts motor speed to match demand, leading to energy savings, reduced energy consumption, and lower operational costs.

Benefits of Low-Pressure Screw Compressors

1. Constant flow of compressed air, ideal for processes that require stability.
2. Lower energy consumption compared to piston compressors, especially when integrated with VSD.
3. Superior lubricating and sealing properties due to oil injection, extending the lifespan of moving parts.
4. Enhanced reliability through efficient oil separation, resulting in high quality compressed air.
5. Reduced operational costs due to better energy efficient design.

Low-Pressure Screw Compressor Applications

Low-pressure rotary screw compressor industries span across multiple sectors:

• Textiles: for processes requiring large volumes of air at low pressure.
• Food and Beverage: where consistent compressed air supply ensures production reliability.
• Paper and Pulp: applications requiring constant flow.
• Chemicals: processes needing oil lubricated compressors for efficiency.
• Electronics: where stable air is critical.

Selecting a Low-Pressure Oil-Injected Compressor

When selecting low-pressure oil-injected compressors, several factors must be considered:

• Required pressure range (low vs. high pressure applications).
• Energy efficient features such as Low-Pressure Dry Oil-free Rotary Screw VSD Compressor from DREAM.
• Maintenance and reliability of moving parts and oil separators.
• Comparison with alternative types of air compressors, such as piston compressors or oil-free rotary screw compressors.

Industrial Impact and Future Outlook

The demand for injected rotary screw compressors continues to grow as industries focus on sustainability and energy savings. The balance of high quality air delivery, lower operational costs, and adaptability with variable speed drive systems makes them one of the most versatile choices.

In conclusion, oil-injected low-pressure rotary screw air compressors are indispensable in industries seeking reliable, efficient, and cost-effective compressed air solutions. By understanding the working principle, exploring the benefits of low-pressure screw compressors, and analyzing their applications, businesses can make informed choices to optimize energy use and maximize performance.