Detailed introduction of Roots vacuum fan
Roots vacuum fan, also known as Roots blower or Roots blower, is a type of positive displacement fan mainly used for gas compression and transportation. The following is a detailed introduction to Roots vacuum fan:
1、 Basic Composition
Roots vacuum fan is mainly composed of five parts: casing, wall panel, impeller, oil tank, and muffler.
1. Shell: mainly serves to support (wall panels, impellers, mufflers) and fix.
2. Wall panel: mainly used to connect the casing and impeller, support the rotation of the impeller, and provide end face sealing effect.
3. Impeller: It is the rotating part of a Roots blower, usually divided into two blades and three blades. The three bladed impeller has smaller air pulsation, lower noise, and smoother operation than the two bladed impeller, so the three bladed Roots blower has gradually replaced the two bladed Roots blower.
4. Oil tank: mainly used to store lubricating oil for lubricating gears and bearings.
5. Muffler: Used to reduce the noise generated by airflow pulsation during the inlet and outlet of Roots blower.
2、 Working principle
The working principle of Roots vacuum fan 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 continuously transported from the inlet to the outlet, completing the entire gas transportation process.
3、 Main features
1. Simple structure: Roots vacuum fan has a compact structure and is easy to manufacture.
2. Low vibration and noise: The three blade rotor structure and the reasonable structure at the inlet and outlet of the housing make the fan have low vibration and noise.
3. Long lasting performance: The impeller and shaft are an integral structure with no wear on the impeller. The fan's performance remains unchanged and can operate continuously for a long time.
4. High volumetric efficiency: The fan has a high utilization rate of volume and high volumetric efficiency.
5. Flexible installation method: The structure is compact, the installation method is flexible and varied, and the models are complete, which can meet the needs of different users and purposes.
4、 Application Fields
Roots vacuum fans are widely used in multiple fields, including but not limited to:
1. In the field of environmental protection, such as sewage treatment and garbage incineration, the stable air transport function helps to achieve processes such as sewage aeration and garbage incineration, thereby improving the efficiency and quality of environmental treatment.
2. In the field of electricity, Roots blowers are mainly used for fuel delivery and combustion air supply in thermal power plants. Its air transport capacity can meet the large demand for air in thermal power plants, ensuring the stable operation of the power generation process.
3. In the field of chemical engineering, Roots blowers are widely used in various gas transportation and stirring processes during chemical production. Its stable performance can ensure the efficiency of chemical production.
4. In the food industry, Roots blowers can be used for drying, ventilation, and stirring in the food production process. Its low noise and low vibration characteristics make the food production environment more comfortable, while improving product quality.
5、 Usage and maintenance
1. Precautions for use:
① The inlet temperature of the conveying medium should usually not exceed 40 ℃.
② The content of particles in the medium shall not exceed 100mg/m3, and the particle size shall not exceed half of the working gap.
③ The bearing temperature during operation shall not exceed 95 ℃, and the lubricating oil temperature shall not exceed 65 ℃.
④ The pressure used shall not exceed the pressure range specified on the nameplate.
2. Maintenance suggestion:
① Regularly check the fastening condition of each part and whether there is any looseness in the positioning pin.
② Pay attention to whether the lubrication and heat dissipation are normal, pay attention to the quality of the lubricating oil, and regularly listen for any noise during the operation of the blower.
③ Pay attention to the increasing trend of intake and exhaust pressure, bearing temperature, and motor current to determine whether the machine is running normally.
④ Before disassembling the machine, the dimensions of each fitting should be measured, recorded, and marked on the components to ensure that the original fitting requirements are maintained after assembly.
⑤ The oil tank of a new or overhauled blower should be cleaned and put into operation according to the usage steps. It is recommended to replace the lubricating oil after running for 8 hours.
⑥ A reasonable maintenance system should be formulated based on specific usage conditions, carried out on schedule, and recorded. It is recommended to conduct a major overhaul once a year and replace bearings and related vulnerable parts.
In summary, Roots vacuum fans are widely used in multiple fields due to their stability, low noise, and low vibration characteristics. During use, attention should be paid to its usage conditions and regular maintenance should be carried out to ensure its long-term stable operation.
