The Roots blower is composed of five main parts: the housing, wall plate, impeller, oil tank, and muffler.

Shell: Primarily serves as support (wall panels, impellers, mufflers) and fixation.

Panel: Primarily used to connect the housing with the impeller, supporting its rotation, and providing end face sealing.

Impeller: The rotating part of the Roots blower, available in two-blade and three-blade designs. Due to the many advantages of the three-blade design, such as reduced exhaust pulsation, lower noise, and smoother operation, it has gradually replaced the two-blade Roots blower.

Fuel Tank: Primarily used for storing lubricating oil for gears and bearings.

Silencer: Reduces noise generated by the pulsation of airflow during the intake and exhaust of a Roots blower.

Principle

Roots blowers are a type of volumetric blower, featuring two three-blade impellers rotating in a sealed space between the casing and wall plates. As each impeller is shaped with a involute or a cycloid contour, the three blades on each impeller are identical, and so are the two impellers themselves, significantly reducing the difficulty of manufacturing. The impellers are machined using CNC equipment, ensuring that regardless of their rotational position, the two impellers maintain a consistent small gap with the center distance unchanged, thus keeping gas leakage within the permissible range.

Two impellers rotate in opposite directions. Due to the small gaps between the impellers, the housing, and the wall panel, the inlet forms a vacuum. Air is drawn into the inlet chamber under the force of atmospheric pressure. Then, two blades of each impeller, along with the wall panel and housing, form a sealed chamber. As the impellers rotate, the air in the inlet chamber is continuously carried to the exhaust chamber by the sealed chamber formed by the two blades. Since the impellers in the exhaust chamber mesh with each other, they squeeze out the air between the two blades. This continuous operation ensures a steady flow of air from the inlet to the outlet, which is the entire working process of a Roots blower.

The Roots blower features a housing designed with a special structure, ensuring reliable operation under high pressure and reduced operating noise; 2. The blower impeller and shaft are integrated, providing rigidity and ensuring high pressure, large flow rate, and smooth operation at high speeds.

The fan oil seal is made of imported fluoroelastomer material, which is heat-resistant, wear-resistant, and has a long service life.