Roots blower is a type of positive displacement fan, whose working principle mainly relies on the relative motion of two blade rotors (usually three bladed impellers) in the cylinder to compress and transport gas. The following is a detailed introduction to its working principle:
1、 Basic Structure
Roots blower is mainly composed of components such as casing, impeller, gears, bearings, etc. Among them, two impellers rotate towards each other, and the gap between them and the casing and wall panel forms a sealed working chamber.
2、 Working principle
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 inhalation: 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 inhaled into the inlet chamber under atmospheric pressure.
3. Gas compression: As the impeller continues to rotate, two of the blades of each impeller form a sealed chamber with the wall panel and casing. The air in the intake chamber is continuously carried to the exhaust chamber by the sealed chamber formed by these two blades during the rotation of the impeller. Also, because the impellers in the exhaust chamber are interlocked, the air between the two blades is squeezed out.
4. Gas exhaust: Through continuous inhalation and compression, air is transported from the inlet to the outlet on site, completing the entire gas transportation process.
3、 Characteristics and Applications
Roots blower has the advantages of simple structure, easy manufacturing, low vibration, low noise, long-lasting performance, long-term continuous operation, high volume utilization rate, and high volume efficiency. Therefore, it is widely used in various fields such as aquaculture oxygenation, sewage treatment aeration, cement conveying, pneumatic conveying, flue gas desulfurization and denitrification, ventilation, etc.
In addition, Roots blowers also have the characteristic of mandatory gas transmission. When the resistance of the process system increases, without changing the working speed, it can only cause an increase in the load on the motor, and the amount of air transported will not significantly decrease. This gives the Roots blower an advantage in situations where stable air output is required.
4、 Operating conditions and precautions
The operating conditions of Roots blower include: the inlet temperature of the conveying medium should usually not exceed 40 ℃; The bearing temperature during operation shall not exceed 95 ℃, and the lubricating oil temperature shall not exceed 65 ℃; The pressure used shall not exceed the pressure rise range specified on the nameplate.
When using a Roots blower, the following precautions should also be taken:
1. Fans should not be installed in places where people frequently enter and exit to prevent injury.
2. Fans should not be installed in places that are prone to producing flammable, explosive, and corrosive gases to prevent accidents such as fire and poisoning.
3. When installing the fan, it is necessary to check whether the foundation is firm and whether the surface is flat.
4. Pay attention to whether the lubrication and heat dissipation are normal, and regularly listen for any noise during the operation of the blower.
In summary, Roots blowers have been widely used and recognized in multiple fields due to their working principle and excellent performance characteristics.
