The construction principle of Roots blower is mainly based on its unique rotor design and volumetric working principle. The following is a detailed explanation of the construction principle of Roots blower:
1、 Construction composition
The Roots blower mainly consists of the following key components:
1. Shell: The shell is the main part of a Roots blower, usually made of cast iron or steel plate, with sufficient strength and rigidity to withstand the internal pressure and external loads of the blower. The casing mainly plays a supporting and fixing role, providing protection and working space for the internal impeller and other components.
2. Wall panel: The wall panel is used to connect the casing with the impeller and support the rotation of the impeller. At the same time, the wall panel also plays a role in sealing the end face, ensuring effective compression and transportation of gas inside the fan.
3. Impeller: The impeller is the core component of a Roots blower, usually made of aluminum alloy or cast iron, with two or three blades (three bladed impellers are more common because they have advantages in air pulsation, noise, and smooth operation). Leave gaps between the blades to ensure that they do not collide with each other during rotation.
4. Drive shaft and driven shaft: The drive shaft and driven shaft are respectively connected to the drive impeller and the driven impeller, and are supported in the casing through bearings. The driving shaft is usually driven by an electric motor or diesel engine, which drives the driven shaft and impeller to rotate together.
5. Gears: Gears are used to connect the driving shaft and the driven shaft, ensuring that the two impellers can rotate synchronously and in reverse. Gears are usually made of high-strength alloy steel, which has sufficient wear resistance and impact resistance.
6. Bearings: Bearings are used to support the driving and driven shafts, reduce friction and wear, and ensure the smooth operation of the fan. Bearings are usually either rolling bearings or sliding bearings, depending on the specifications and operating environment of the fan.
7. Oil seal: Oil seals are used to prevent gear oil from leaking into the interior or external environment of the casing, ensuring the sealing performance of the fan.
8. Oil tank: The oil tank is mainly used to store lubricating oil, which is used to lubricate gears and bearings, ensuring the normal operation of the fan and extending its service life.
9. Inlet and exhaust ports and muffler: The inlet and exhaust ports are located at both ends of the casing respectively, used for gas suction and discharge. Silencers are used to reduce the noise generated by airflow pulsation during the intake and exhaust process of Roots blowers.
2、 Working principle
The working principle of Roots blower is based on its volumetric characteristics. After the motor is started, the driving shaft drives the driven shaft and impeller to rotate together through gear transmission. Due to the relative motion of the two impellers inside the cylinder, the cavity between them continuously sucks in air and discharges it outward, thereby generating airflow. During the rotation of the impeller, air is gradually compressed and discharged from the exhaust port. Roots blower belongs to the "external compression" type, with no volume change during the conveying process and no internal pressure change (relying on pipeline back pressure).
3、 Characteristics and Applications
Roots blower has the characteristics of simple structure, easy manufacturing, stable operation, and strong adaptability. It is widely used in fields such as sewage treatment, sewage aeration, waste gas treatment, gas transportation, and powder transportation. Meanwhile, due to its ability to adapt to various gas media and working conditions, Roots blowers also have broad application prospects and development potential.
In summary, the construction principle of Roots blower is mainly based on its unique rotor design and volumetric working principle. Through the collaborative action of various components, Roots blower can achieve effective compression and transportation of gas.
