What is the difference between a centrifugal fan and a Roots blower? After reading this article, you will understand!
Many friends are often confused when choosing industrial fans by centrifugal fans and Roots fans. These two types of fans may seem capable of supplying air, but their actual applications are quite different. Today we will discuss their differences from several key perspectives to help you avoid the embarrassment of choosing the wrong device!
The working principle is very different
1 * * Centrifugal fan * *: Like a rotating umbrella throwing water, it "throws" air out through a high-speed rotating impeller. After entering the fan, the air is accelerated and changes direction under the action of centrifugal force, and is discharged from the air outlet.
2 * * Roots blower * *: More like two meshing gears, it rotates inside the casing through two three or two bladed rotors, pushing air from the inlet to the outlet. The air volume remains basically unchanged, but the pressure increases.
Performance Characteristics Comparison
1 * * Wind volume and pressure characteristics * *:
-Centrifugal fan: The air volume varies greatly with pressure, suitable for medium air volume and medium pressure applications
-Roots blower: The airflow is almost unaffected by pressure, making it suitable for high-pressure applications that require stable airflow
2 * * Efficiency difference * *:
-The efficiency of centrifugal fans is generally between 60-85
-The efficiency of Roots blower is relatively low, about 50-70%
3 * * Noise level * *:
-Centrifugal fan has relatively low noise
-Roots blowers produce significant noise due to pulsating airflow and typically require mufflers
Pain points in maintenance and use
1 * * Maintenance difficulty * *:
-Centrifugal fans have a simple structure and are easy to maintain
-The rotor clearance requirements for Roots blowers are strict and maintenance is complex
2 * * Common faults * *:
-Centrifugal fan: impeller wear, excessive vibration
-Roots blower: rotor wear, gearbox failure
3 * * Startup Features * *:
-Centrifugal fans can start without load
-Roots blower must be started with load, otherwise it may damage the equipment
material costs
1 * * Initial investment * *:
-Centrifugal fans are cheaper at low air volumes
-Roots blower has more cost advantage under high air volume and high pressure
2 * * Operating costs * *:
-Centrifugal fans have high efficiency and are more energy-efficient during long-term operation
-The maintenance cost of Roots blowers is usually higher
Typical application scenarios
1 * * Centrifugal fan is suitable for * *:
-HVAC system ventilation
-Boiler induced draft
-General industrial air supply
2 * * Roots blower excels in * *:
-Sewage treatment aeration
-Pneumatic conveying system
-High pressure applications requiring constant flow rate
When making a choice, it should be based on the actual working conditions and requirements, not just the price! If you are still unsure, it is recommended to consult a professional engineer to avoid selecting the wrong equipment and causing unnecessary losses.
