What are Scroll Compressors?

Are you looking for a way to improve the energy efficiency of your compressed air systems? By switching from a traditional piston compressor (reciprocating compressor) to a scroll compressor (rotary compressor), you could not only reduce your electricity bills but also minimise maintenance, gain greater control over the pressure of your compressed air, and improve your compressed air quality. But what exactly are scroll compressors, how do they work, and what are their pros and cons?

Anglian Compressors has been at the cutting edge of compressed air technology since 1977 and a premier distributor for the highly esteemed Atlas Copco, for almost 50 years. In this article, we explain everything you need to know about scroll air compressors so that you can decide whether upgrading is worth the expense for your business. If you have any questions or want to know how much a scroll compressor could save you in the long run, do not hesitate to call us.

Understanding Scroll Compressors

A scroll compressor – often called a scroll pump or spiral compressor – works by internally compressing air between a stationary scroll and an orbiting scroll, a process known as positive displacement. There are two main types of scroll compressors: oil-free and oil-lubricated. While oil-lubricated systems tend to be more common and budget-friendly, oil-free compressors are the preferred choice in industries where air purity is critical, such as food and beverage, medical, and pharmaceutical sectors.

How do Scroll Compressors Work?

Scroll compressors operate with a pair of spiral-shaped scroll members – one stationary and one orbiting. The orbiting scroll, driven by a motor, moves around the stationary scroll, creating air pockets that get progressively smaller as the air is compressed toward the center of the scroll. This method of compression is particularly energy-efficient due to reduced mechanical losses.

The compressed air exits through an outlet port equipped with a non-return valve, which maintains consistent pressure and prevents backflow. This ensures reliable performance and minimal air loss. Whether the application requires an oil-lubricated or oil-free system, scroll compressors offer consistent, high-quality output.

Air is drawn in through an inlet valve, where it enters the scroll. As the scroll moves, it captures and compresses the air efficiently, whether the application requires an oil-lubricated or oil-free system. The compressed air exits through an outlet port, with a non-return valve preventing backflow, maintaining pressure.

Scroll compressors are becoming increasingly popular in applications like HVAC systems, air conditioning, and transportation of food, due to their quiet operation, efficiency, and durability. Their design, with fewer moving parts, leads to less wear and tear, making them a reliable choice for industries with specific air quality needs.

Modular versus Single Scroll Compressors

Modular Scroll Compressors: Utilise variable flow technology, allowing the output to adjust dynamically to demand. They often feature a central controller for monitoring and optimising performance across multiple modules.

Single Scroll Compressors: Provide fixed output, making them simpler and more affordable upfront but potentially less energy-efficient during varying load demands.

Applications of Scroll Compressors

Scroll compressors are versatile and commonly used across a range of industries due to their efficiency, compact design, and reliability:

• HVAC (Heating, Ventilation, and Air Conditioning)
• Refrigeration systems and cold storage
• Food and beverage production (e.g., ice-making machines and packaging)
• Medical and dental equipment
• Electronics cooling and data center management
• Metal fabrication and plastic molding
• Transportation refrigeration (refrigerated trucks)

Their compact design and ability to deliver clean air make them a preferred solution in industries with strict operational and environmental standards​.

Advantages of Scroll Compressors

Scroll compressors offer several key benefits that make them a popular choice across industries:

Energy Efficiency
Scroll compressors operate with a smooth, continuous compression process, which minimises friction, leakage, and mechanical losses. Oil-free models, in particular, align with energy efficiency goals by meeting Class 0 air purity standards .

Reliability and Durability
With fewer moving parts inside the scroll, these compressors are more reliable and less prone to mechanical failure. The design also minimises the need for clean environments, making them durable for various applications, including air conditioning systems and other demanding settings.

Quiet Operation
Scroll compressors, especially in HVAC applications, are known for their quiet performance. They generate less vibration and noise, which is crucial for noise-sensitive environments like medical facilities and offices.

Compact Design
The compact design of scroll compressors allows for easy installation in tight spaces, making them ideal for applications such as air conditioners and refrigeration, where space is limited. Their smaller size doesn’t compromise performance, ensuring high-quality compressed air. Scroll compressors are easier to install in limited spaces without compromising performance.

Consistent Air Quality
Scroll compressors produce high-quality compressed air with minimised leakage, which is essential for industries with strict air quality requirements. Oil-free models are particularly beneficial in applications requiring absolutely Class Zero air purity, such as food and pharmaceuticals.

Reduced Maintenance
The simple, robust design, including components like the elektronikon® control, requires less maintenance. This leads to lower overall costs, minimal downtime, and an economical long-term solution for businesses.

Disadvantages/advantages of Scroll Compressors

Scroll compressors almost always work out cheaper than piston compressors in the long run while providing greater control over the pressure of your compressed air systems. Nevertheless, you should be aware of the following disadvantages before committing to a purchase:

Higher purchase price

Scroll compressors typically have higher upfront costs compared to piston compressors. However, their long-term energy savings and reliability often outweigh the initial expense​.

Complex Maintenance

Scroll compressors, though less prone to wear, can be challenging to service due to their precise design. Repairs often require specialised tools or component replacement.

Discover Our Range of Technologically Advanced Scroll Compressors

If you want to reduce your energy costs while gaining more control over the accuracy, pressure, and purity of your compressed air systems, you might benefit by switching from a piston compressor to a scroll compressor. Fortunately, if you are looking for versatile, cost-effective and durable solutions, you have come to the right place.

At Anglian Compressors, we have been an industry-leading supplier and installer of top-quality compressors by manufacturers such as Atlas Copco for over half a century. Whether you have questions about our products or want to know more about the latest technology, we are only a phone call away. Contact us today to learn more about us and our products.