The working principle and structural characteristics of Roots blower are explained in detail as follows:
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1、 Working principle
Roots blower is a type of positive displacement fan, which mainly relies on the relative motion of two blade rotors (usually three bladed impellers) in the cylinder to compress and transport gas. The specific process is as follows:
1. Impeller rotation: When the motor drives one of the impellers to rotate, the other impeller will rotate synchronously at the same speed and in the opposite direction through the action of the synchronous gear.
2. Gas suction and compression: Due to the gaps between impellers, impellers and casings, and impellers and wall panels, a vacuum state is formed at the inlet during the rotation of the impeller, and air is sucked into the inlet chamber under atmospheric pressure. As the impeller continues to rotate, two of the blades of each impeller form a sealed chamber with the wall panel and casing, and the air in the intake chamber is continuously carried to the exhaust chamber by the sealed chamber formed by these two blades. Also, because the impellers in the exhaust chamber are interlocked, the air between the two blades is squeezed out.
3. Gas exhaust: Through continuous inhalation and compression, air is transported from the inlet to the outlet on site, completing the entire gas transportation process.
2、 Structural characteristics
Roots blower has various structural characteristics, which make it perform well in various applications:
1. Main structure: The Roots blower is mainly composed of components such as the casing, wall panels, and impeller. It adopts a volumetric design, which uses two interlocked impellers (usually a three bladed design) to change the working chamber volume during rotation to transport gas.
2. Three bladed rotor: Compared to the two bladed rotor, the three bladed design has less gas pulsation, lower vibration, and lower noise during rotation. This design makes the Roots blower operate more smoothly, reducing unnecessary vibration and noise.
3. Gap design: There is a gap between the impeller and the body to avoid direct contact, thereby reducing friction loss and improving efficiency. At the same time, this gap design also facilitates maintaining the mutual clearance between rotors, improving sealing performance.
4. Equal diameter gear: The Roots blower uses a pair of equal diameter gears to ensure that the two rotors mesh with each other while rotating in the opposite direction at a constant speed. This design enables the rotor to maintain a stable relative position during rotation, ensuring stable gas delivery.
5. High precision manufacturing: Gears are usually made of special steel and undergo quenching and high-precision grinding treatment to ensure smooth operation and reduce adverse interference with the product.
6. Compact structure: The Roots blower has a compact structure, small volume, and is easy to install and maintain. This enables it to be flexibly applied in various confined spaces.
7. Flexible installation: The installation method of Roots blower is flexible and versatile, and can be installed horizontally or vertically according to actual needs. This flexibility enables Roots blowers to adapt to different application scenarios and installation conditions.
8. Long lifespan: Due to the integrated design of the impeller and shaft, and the absence of wear on the impeller, the performance of the Roots blower is long-lasting and can operate continuously for a long time.
9. Control: The Roots blower adopts an advanced digital control system, which can control the blower to meet different air volume and pressure requirements.
In summary, Roots blowers have the advantages of simple structure, easy manufacturing, low vibration, low noise, long-lasting performance, long-term continuous operation, high volume utilization rate, high volume efficiency, compact structure, and flexible installation methods. These characteristics make Roots blowers have significant advantages in gas conveying and pressurization, and are widely used in various fields such as aquaculture oxygenation, sewage treatment aeration, cement conveying, pneumatic conveying, flue gas desulfurization and denitrification, ventilation, etc.
