Roots Blower
Key Features
| Roots Blower | : | Type Positive Displacement Rotary Lobe Blower Material Cast Iron / Steel Rotor Type Two-lobe / Three-lobe Flow Range 50–10,000 m³/hr Pressure Range 0.1–1.0 kg/cm² Cooling Type Air-cooled Drive Type Direct Coupling Noise Level ≤ 80 dB Lifespan 8–10 years (with regular maintenance) |
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High-Efficiency Roots Blower – Reliable Air Blower for Industrial and Wastewater Applications
The Roots Blower is a positive displacement rotary air blower designed to deliver a constant volume of air at varying discharge pressures. Known for its robust construction, high efficiency, and durability, this machine plays a crucial role in numerous industrial processes such as wastewater treatment, pneumatic conveying, aquaculture aeration, cement plants, and more.
Unlike traditional fans or compressors, the Roots Blower operates on a simple yet effective principle that ensures a steady, pulsation-free airflow — making it an ideal choice for continuous and heavy-duty applications.
1. Overview
The Roots Blower, also known as a Rotary Lobe Blower, works by trapping a specific volume of air between two counter-rotating lobes and the casing, then pushing it from the inlet to the outlet. Since it delivers a constant air volume regardless of pressure variations.
Its rugged mechanical design ensures long-lasting performance with minimal maintenance. The Roots Blower is commonly used to supply air in aeration tanks, transport materials pneumatically, or generate vacuum pressure for industrial systems.
2. Design and Construction
The Roots Blower is built with precision-engineered components to ensure efficient performance and long service life. The housing, rotors, and shaft are made from high-grade cast iron or ductile steel, ensuring durability and resistance to wear.
The two-lobe or three-lobe rotors rotate in opposite directions within a close-clearance casing, driven by synchronized timing gears. This contact-free operation ensures zero metal-to-metal friction, reducing wear and eliminating the need for internal lubrication.
Each blower is fitted with oil-lubricated bearings on both sides and mechanical seals that prevent air leakage. The casing and impellers are dynamically balanced to minimize vibration and noise, ensuring smooth operation even under continuous load.
3. Working Principle
The Roots Blower operates on the positive displacement principle. As the rotors turn, air enters through the inlet and is trapped in the space between the rotor lobes and casing. The trapped air is then carried around the casing to the outlet side.
Because the rotors maintain precise clearance and never touch each other, there is no internal compression — instead, air pressure builds up as the outlet resistance increases. This unique design results in steady, non-pulsating airflow and constant air volume regardless of outlet pressure changes.
4. Applications
Roots Blowers are used in a wide variety of industries and applications due to their reliability and versatility. Some key uses include:
Wastewater Treatment Plants: Supplies air for aeration tanks and biological treatment.
Aquaculture: Provides oxygen for fish and shrimp farming ponds.
Cement & Lime Plants: Used for conveying powdered materials pneumatically.
Power Generation: Air supply for combustion and cooling systems.
Chemical & Petrochemical Plants: Gas transfer, vapor recovery, and vacuum creation.
Food & Beverage Industry: Used for pneumatic conveying of granules and powders.
Textile and Paper Industry: Assists in drying, conveying, and air agitation.
5. Features and Benefits
Constant Airflow Output: Delivers a fixed air volume independent of pressure variations.
Heavy-Duty Construction: Made from cast iron/steel for long-term durability.
Oil-Free Air Delivery: Non-contact rotors eliminate the risk of oil contamination.
Low Vibration & Noise: Precision balancing ensures smooth and quiet performance.
Easy Maintenance: Simple design allows easy inspection and servicing.
High Efficiency: Optimized design ensures low power consumption.
Versatile Use: Suitable for pressure and vacuum applications alike.
Reliable Operation: Designed for continuous duty under demanding conditions.
6. Performance & Operation
The Roots Blower can operate across a wide pressure range, typically from 0.1 kg/cm² to 1.0 kg/cm², and can deliver air volumes from 50 m³/hr to over 10,000 m³/hr, depending on the model and configuration.
The blower can be directly coupled with an electric motor or driven by a belt pulley system. For protection and optimal efficiency, accessories such as silencers, filters, pressure relief valves, and non-return valves are used.
7. Maintenance and Safety
Regular maintenance ensures smooth and safe operation. Users should:
Check and replace lubricating oil periodically.
Inspect the inlet filter and clean it to prevent dust buildup.
Monitor vibration and noise for early detection of mechanical wear.
Ensure proper alignment of motor and blower shafts.
Use relief valves to prevent overpressure damage.
With proper care, a Roots Blower can operate efficiently for 8–10 years with minimal downtime.
8. Technical Specifications
Type: Positive Displacement Rotary Lobe Blower
Material: Cast Iron / Ductile Iron / Steel
Rotor Type: Two-lobe / Three-lobe
Air Flow Capacity: 50–10,000 m³/hr
Pressure Range: 0.1–1.0 kg/cm²
Vacuum Range: Up to -0.5 bar
Lubrication: Oil splash system
Drive Type: Direct-coupled or Belt-driven
Cooling: Air-cooled
Noise Level: ≤ 80 dB (with silencer)
Operating Temperature: Up to 120°C
9. Why Choose This Roots Blower
The Roots Blower combines reliability, performance, and efficiency. It’s an essential machine for any system requiring consistent airflow under variable pressure. Its sturdy build and minimal maintenance make it one of the most cost-effective solutions in industrial air-handling applications.
Whether it’s for wastewater aeration, pneumatic conveying, or general air supply, this Roots Blower ensures dependable operation 24/7 — delivering performance you can trust.
| Roots Blower | Type Positive Displacement Rotary Lobe Blower Material Cast Iron / Steel Rotor Type Two-lobe / Three-lobe Flow Range 50–10,000 m³/hr Pressure Range 0.1–1.0 kg/cm² Cooling Type Air-cooled Drive Type Direct Coupling Noise Level ≤ 80 dB Lifespan 8–10 years (with regular maintenance) |
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