Definition of Roots Blower?
Before replying what is a Roots Blower, it is useful to know the inventors who named them.The roots blowers were invented by Francis Marion Roots and Philander Higley Roots in 1854. A Roots blower pump, also known in industry as rotary positive displacement blowers, rotary lobe blowers, roots blowers, or roots-type supercharger, is a type of positive displacement pump commonly used in various industries for moving large volumes of gas or air at relatively low pressures. They are essential components in various industries, such as wastewater treatment, pneumatic conveying, chemical processing, power generation, food, mining, thermoforming, surface treatment, soil remediation, aquaculture, and fish farms.
The Roots blower pump operates using two counter-rotating lobed rotors, often referred to as “twisted lobe” rotors, which are housed in a casing. The rotors, usually with two, three, or four lobes, mesh together without touching each other, and their synchronized rotation creates a series of expanding and contracting volumes between the rotor lobes and the pump casing. As the rotors turn, air or gas is drawn into the expanding volume on the inlet side of the pump, trapped between the rotor lobes and the casing, and then forced out through the outlet side as the volume between the lobes contracts.
They are known for their high flow rates, robustness, and low maintenance requirements, but they are not suitable for applications requiring high pressure ratios or high compression efficiency.
Positive displacement lobe pumps are employed not only pressure applications but also vacuum applications.