Everything About Oil-Injected Air Compressors | Working & Uses

Compressed air is an essential resource in various industries, from manufacturing to automotive and energy sectors. Among the many types of air compressors available, oil-injected air compressors stand out for their efficiency, durability, and reliability. These compressors are widely used in industrial applications where continuous and high-performance compressed air supply is crucial. But how do they work, and what makes them an ideal choice for businesses? Let’s explore the technology behind oil-injected air compressors and their benefits.

What Are Oil-Injected Air Compressors?

Oil-injected air compressors are a type of rotary screw compressors that use oil for lubrication, cooling, and sealing during operation. The injected oil plays a vital role in reducing friction between the rotors, dissipating heat, and ensuring efficient compression of air. Unlike oil-free compressors, which rely on special coatings or water-based cooling systems, oil-lubricated compressors offer superior longevity and performance in demanding industrial environments.

How Do Oil-Injected Screw Compressors Work?

The working principle of oil-injected screw compressors is based on a positive displacement mechanism. Here’s a step-by-step breakdown of their operation:

• Air Intake: Atmospheric air is drawn into the compressor through an intake valve and filtered to remove dust and debris.
• Compression Stage: The air enters the rotary screw element, where two intermeshing helical rotors compress the air as it moves along the length of the screws.
• Oil Injection: During compression, a precise amount of oil is injected to reduce heat, lubricate the rotors, and create a seal between them for efficient air compression.
• Separation Process: The compressed air and oil mixture enters a separator, where most of the oil is removed and recirculated back into the system.
• Cooling & Filtration: The compressed air passes through aftercoolers and filters to remove any remaining oil traces before being delivered to the end application.
• Final Output: The clean, compressed air is then stored in a receiver tank or directed into an air distribution system for industrial use.

Advantages of Oil-Injected Air Compressors

Businesses choose oil-injected air compressors for various reasons, including efficiency, durability, and cost-effectiveness. Some of their key advantages include:

High Efficiency and Performance

Since oil reduces friction and heat build-up, oil-lubricated compressors operate more efficiently than their oil-free counterparts. This results in lower energy consumption and enhanced reliability.

Longer Lifespan and Durability

Oil-injected systems protect critical components from wear and tear, extending the lifespan of the compressor. This makes them a cost-effective choice for industries that require continuous operation.

Better Cooling Capabilities

The presence of oil significantly improves heat dissipation, preventing overheating and ensuring consistent performance even under heavy workloads.

Low Maintenance Requirements

The maintenance of oil-injected screw compressors is cost effective, thanks to their built-in lubrication system that reduces wear on moving parts.

Wide Range of Industrial Applications

Industries such as manufacturing, metal working and automotive, rely on industrial screw type air compressors for their ability to deliver a continuous supply of high-pressure compressed air.

Applications of Oil-Injected Screw Compressors

Manufacturing & Production

Manufacturers use oil-injected air compressors for powering pneumatic tools, conveyor systems, and assembly lines.

Automotive Industry

From moving the assembly line to powering hydraulic lifts, oil-lubricated compressors play a crucial role in the automotive sector.

Energy & Oil Refining

Industries dealing with oil and gas refining depend on industrial screw type air compressors for instrument control, pipeline operations, and more.

Choosing the Right Oil-Injected Air Compressor

Selecting the ideal oil-injected air compressor depends on several factors, including:

• Compressed air demand: The volume and pressure requirements of your application.
• Energy efficiency: Choosing a model with advanced energy-saving features can reduce operational costs.
• Size and footprint: Depending on your available space, compact models like ELGi’s industrial screw type air compressors can be a great solution.
• Maintenance and serviceability: Opting for compressors with easy-to-access components can simplify maintenance.
• Oil separation efficiency: Lower oil carryover ensures cleaner compressed air and reduces filter replacement costs.

ELGi’s Advanced Oil-Injected Air Compressors

ELGi is a global leader in air compressor technology, offering a wide range of oil-injected screw compressors designed for high efficiency and reliability. Some of ELGi’s top models include:

1. ELGi EG Series

• Designed for long-lasting performance with energy-efficient airends.
• Advanced air-oil separation ensures minimal oil carryover.
• High durability with low noise operation.

2. ELGi EQ Series

• Compact and reliable with minimal maintenance requirements.
• Robust construction for demanding applications.

3. ELGi EN Series

• Ideal for small and medium businesses looking for cost-effective compressed air solutions.
• Space-saving design with optimised energy consumption.
• Integrated components for reduced leakages and operational efficiency.

Maintenance Tips for Oil Injected Screw Compressors

To maximise the lifespan and efficiency of your oil-injected air compressor, follow these maintenance best practices:

• Regular Oil Changes: Replace compressor oil according to the manufacturer’s recommendations to maintain performance.
• Check Oil Filters: Dirty or clogged filters can reduce efficiency and cause overheating.
• Inspect Air Filters: Keep air intake clean to prevent contaminants from entering the compressor system.
• Monitor Pressure & Temperature: Ensure the system is operating within safe limits to avoid excessive wear.
• Drain Condensate: Remove accumulated moisture to prevent corrosion in air storage tanks.
• Inspect Belts & Hoses: Replace worn-out belts and hoses to prevent unexpected breakdowns.

Conclusion

Oil-injected air compressors are an excellent choice for businesses requiring reliable, high-performance compressed air solutions. Their efficiency, durability, and cost-effectiveness make them the preferred choice across various industries. With brands like ELGi offering top-quality oil-lubricated compressors, industries can benefit from advanced technology, low maintenance, and maximum uptime.

Looking for the best oil-injected screw compressors? Explore ELGi’s range of industrial screw type air compressors for superior performance and long-term cost savings.