Roots blower, also known as Roots blower, is a type of positive displacement fan that works by utilizing two blade rotors to move relative to each other within a cylinder, thereby achieving compression and transportation of gas. The following is a detailed explanation of the Roots blower:
1、 Working principle
The working principle of Roots blower is based on the principle of volumetric compression. Two blade shaped rotors (usually three or two blades) move relative to each other inside the cylinder, maintaining small gaps between the rotors and between the rotors and the cylinder or wall panel. During the rotation of the rotor, the gas at the inlet is sucked in, and as the rotor moves, the gas is compressed and pushed to the exhaust outlet for discharge. Due to the gap between the rotors, gas leakage is controlled within the allowable range, thereby ensuring the efficiency of the fan.
2、 Structural characteristics
Roots blower usually consists of five main parts: casing, wall panel, impeller, oil tank, muffler, etc. Among them, the casing plays a supporting and fixing role; The wall panel connects the casing to the impeller and supports the rotation of the impeller; The impeller is the rotating part of a Roots blower, which can be divided into three bladed and two bladed types. The three bladed impeller has the advantages of small exhaust pulsation, low noise, and smooth operation; The oil tank is used to store lubricating oil to lubricate gears and bearings; Mufflers are used to reduce the noise generated by airflow pulsation during the inlet and outlet of fans.
3、 Classification and selection
Roots blowers can be classified according to different design principles and purposes. According to the structural type, there are vertical blowers, horizontal blowers, vertical shaft blowers, dense group blowers, etc. According to the sealing type, there are various types of blowers such as labyrinth seals, expansion ring seals, packing seals, and mechanical seals. In addition, there are also straight toothed Roots blowers and helical toothed Roots blowers.
When selecting, it is necessary to choose based on factors such as air volume, wind pressure requirements, and medium characteristics of the actual usage scenario. At the same time, factors such as installation conditions and maintenance costs of the fan need to be considered.
4、 Application Fields
Roots blowers have the advantages of simple structure, reliable operation, small airflow pulsation, and oil-free lubrication, and are widely used in various fields. For example, used for transporting gases in industries such as chemical, pharmaceutical, food, and electricity; Used for aeration and oxygenation in fields such as sewage treatment and aquaculture; It also exhibits good performance in cement transportation and other occasions.
5、 Usage and maintenance
When using a Roots blower, the following points should be noted:
1. Regularly check the status of inlet and outlet valves and bypass pipes to ensure they are in good working condition.
2. Regularly check and adjust the rotor clearance to ensure that gas leakage is within the allowable range.
3. Regularly inspect and replace the sealing device to prevent gas leakage.
4. Regularly check and clean the filter to prevent clogging.
5. Regularly inspect and replace lubricating oil to ensure the lubrication effect of gears and bearings.
In addition, it is recommended to adjust the wind pressure and air volume by adjusting the speed to achieve an operating state that meets both production needs and energy efficiency. At the same time, attention should be paid to the installation and fixing method of the fan to reduce vibration displacement during operation and improve the operational performance of the equipment.
In summary, Roots blower is a reliable positive displacement fan with wide applications in various fields. In the process of use and maintenance, it is necessary to follow the specifications and precautions to ensure its normal operation and extend its service life.
