Introduction to Roots induced draft fan
Roots induced draft fan, also known as Roots blower, is a type of positive displacement fan widely used in various industrial fields. The following is a detailed introduction to Roots induced draft fan:
1、 Working principle
The working principle of Roots induced draft fan mainly relies on the relative motion of two blade rotors (usually three bladed impellers) in the cylinder to compress and transport gas. 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. During the rotation of the impeller, a vacuum is formed at the inlet due to the gaps between the impellers, the impeller and the casing, and the impeller and the wall panel. 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. Through continuous inhalation and compression, air is continuously transported from the inlet to the outlet, completing the entire gas transportation process.
2、 Main features
1. Three blade rotor structure: Roots induced draft fans typically use a three blade rotor design, which results in low vibration and noise during operation.
2. Overall structural design: The impeller and shaft of the fan are designed as a whole, avoiding the problem of impeller wear and ensuring the long-term stability of the fan performance. At the same time, this design also makes the fan structure compact, small in size, lightweight, and easy to install and maintain.
3. Energy saving: Roots induced draft fans have high efficiency and relatively low energy consumption. This is due to its specially designed rotor curve and reasonable meshing method, which reduces leakage and improves volumetric efficiency.
4. Output air cleanliness: Due to the lack of friction and lubrication inside the fan, the output air is clean and free of oil stains, suitable for occasions with high air quality requirements.
5. Pressure stability: Roots induced draft fan belongs to constant volume fan, and pressure changes have little impact on air volume. The air volume is mainly proportional to the speed of the fan, so the air volume can be adjusted by adjusting the speed to meet different needs.
6. Strong adaptability: There is a gap of 0.2-0.5mm between the fan rotor and the transfer, and between the rotor and the shell, without friction, allowing the airflow to contain dust. This enables Roots induced draft fans to maintain good performance when transporting gases containing dust.
3、 Application Fields
Roots induced draft fans have a wide range of applications, including but not limited to:
1. Wastewater treatment: In wastewater treatment systems, Roots induced draft fans are commonly used in aeration systems to inject gas into the aeration tank to promote biodegradation and oxidation processes in wastewater, thereby improving the efficiency of wastewater treatment.
2. Pharmaceutical industry: In the pharmaceutical process, Roots induced draft fans can be used to provide stable airflow for drying, mixing, and conveying materials such as powders and particles, ensuring the smooth progress of the pharmaceutical process.
3. Food processing: In the food processing industry, Roots induced draft fans are commonly used for dehydration, drying, cooling, and other processes to help process food and its raw materials, ensuring the quality and taste of the food.
4. Chemical industry: In the chemical industry, Roots induced draft fans can be used for gas supply or vacuum pumping to meet the needs of processes such as distillation, drying, cooling, and gas transportation.
5. Oil and gas industry: Roots induced draft fans can be used to provide pressure or vacuum for processes such as refining, oil and gas transportation and processing, and compressed natural gas.
6. Mining and mineral processing: In these industries, Roots induced draft fans are used for emissions, exhaust, gas transportation, drying, and other processes to improve the working environment and increase production efficiency.
In addition, Roots induced draft fans are widely used for ventilation, dust removal, and exhaust gas treatment in the paint coating industry, as well as ventilation systems in underground engineering such as subways and tunnels. In the air conditioning system of buildings, Roots induced draft fans are also used for cooling and circulating air, ensuring comfort and air quality inside the building.
4、 Maintenance and upkeep
In order to ensure the normal operation and extend the service life of Roots induced draft fans, regular maintenance and upkeep are necessary. Here are some common maintenance and upkeep measures:
1. Cleaning the fan room: Regularly clean the fan room, maintain a clean environment and good ventilation, and prevent impurities such as dust and moisture from entering the inside of the fan.
2. Cleaning fan components: Regularly clean the casing, air inlet, and air outlet of the Roots induced draft fan to prevent dust accumulation from affecting heat dissipation and ventilation efficiency. At the same time, clean or replace the filter to prevent dust and impurities from entering the interior of the fan.
3. Lubrication components: According to the manufacturer's recommendations, regularly lubricate the bearings, gears, and other components of the Roots induced draft fan to ensure smooth machine operation. Rolling bearings require regular lubrication, while shaft sealing devices require regular oil filling.
4. Check the fastening condition: Regularly inspect the fastening condition of various parts of the Roots induced draft fan, including bolts, nuts, locating pins, etc., to prevent faults caused by looseness. Pay special attention to the fastening of key parts such as bearing seats and couplings.
5. Detecting operating status: Regularly inspect the performance and operating status of Roots induced draft fans, including measuring and calibrating parameters such as pressure, flow rate, temperature, and vibration. Timely detection and resolution of potential issues through testing.
In summary, Roots induced draft fans play an important role in multiple industrial fields due to their unique working principle and superior performance characteristics. During use, it is important to choose the appropriate type and perform regular maintenance and upkeep to ensure its normal operation and extend its lifespan.
