how does a roots type blower work

How does a roots type blower work

Roots blower works with two rotors meshing with each other. When the gear drives the rotor to rotate, relative motion occurs between the two rotors, thereby forming airflow. One of the rotors is called the main rotor and the other is the passive rotor. The gear of the main rotor drives the passive rotor, which rotates simultaneously but in opposite directions.
Gas is continuously entered and discharged in the gap between the two rotors, thereby generating pressure or extracting exhaust gas.

Roots blower structural features:

The rotor and casing of Roots blowers are usually made of high-strength alloy materials to ensure their durability and stability.
The rotor surface is covered with coating to reduce internal friction and wear.
In addition, the Roots blower is equipped with a cooling system to ensure the heat dissipation effect of the equipment during long-term operation.

Root blower working principle

The working principle of the Roots blower is to separate the air inlet and exhaust port through the "meshing" of a pair of rotors. The rotors are driven by a pair of synchronous gears to rotate at a constant speed in opposite directions, and the inhaled gas is discharged from the air without internal compression. The suction port moves to the exhaust port. The moment the gas reaches the exhaust port, it is pressurized and transported due to the return flow of high-pressure gas on the exhaust side. ‌‌
Roots blower is a positive displacement blower. Its working principle is based on the relative movement of two blade-shaped rotors in the cylinder to compress and transport gas. This type of blower has a simple structure and is easy to manufacture. It is widely used in aquaculture oxygenation, sewage treatment aeration, cement transportation and other occasions. It is especially suitable for gas transportation and pressurization systems in low-pressure situations, and can also be used as a vacuum pump. There is a certain gap between the rotors of the Roots blower and they do not contact each other. This design allows the impeller to rotate without friction and does not require lubrication. Its operating temperature is usually not greater than 40°C.

Roots blower uses

‌Sewage treatment‌: Roots blowers are widely used in aeration systems of sewage treatment plants to accelerate the decomposition and oxidation of organic matter in sewage and improve sewage treatment efficiency.
‌Aquaculture‌: In aquaculture, Roots blowers are used to increase oxygen, increase the density of fish fry, and increase breeding output.
‌Chemical Industry‌: In the chemical, fertilizer, petrochemical, building materials and other industries, Roots blowers are used in gas transportation and pressurization systems, as well as desulfurization and oxidation processes.
‌Metallurgical Industry‌: In metallurgy, smelting and other industries, Roots blowers are used for blast furnace blowing, etc.
‌Other industrial processes‌: Roots blowers are also used in mine ventilation, powder conveying, pneumatic conveying systems, etc.

Roots blower diagram

Roots blower specifications

Roots blower pressure range

Roots blower is a commonly used gas delivery equipment, and its pressure range is crucial for different applications.
Generally speaking, the pressure range of Roots blower is between 9.8kpa and 200kpa, which is equivalent to 0.0098mpa to 0.2mpa.
This range covers both lower pressure and medium pressure requirements, making Roots blowers widely used in a variety of industrial fields.
It is worth noting that although Roots blowers have a certain pressure range, the specific working pressure needs to be adjusted based on actual usage and flow requirements.
For example, in some situations where high pressure output is required, it may be necessary to select a Roots blower with a higher pressure upper limit, or to increase the output pressure of the blower through other means.