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The term derives from the Roots brothers who invented the rotary lobe pump more than a century ago. Still in business today, Roots™ vacuum pumps are a diverse line of pumps manufactured by Roots division of industrial giant Dresser Industries . APPLICATIONS Roots blowers are typically used in applications where a large volume of gas must be moved across a relatively small pressure differential. This includes low vacuum applications, with the roots blower acting alone, or use as part of a high vacuum system, in combination with other pumps. Roots blowers are also used as Supercharger s. Roots blowers are also used in reverse to measure the flow of gases or liquids, for example, in Gas Meter s. TECHNICAL CONSIDERATIONS Because rotary lobe pumps need to maintain a clearance between the lobes, a single stage roots blower can only pump gas across a limited pressure differential. If the pump is used outside its specification, the compression of the gas generates so much heat that the lobes expand to the point that they jam, damaging the pump. Roots Pump s are capable of pumping large volumes but as they only achieve moderate compression, it is not uncommon to see multiple roots blower stages, frequently with Heat Exchanger s ( Intercooler s) in between to cool down the gas. The lack of oil on the pumping surfaces allows the pumps to work in environments where contamination control is important. The high pumping rate for hydrocarbons also allows the roots pump to provide an effective isolation between oiled Pump s, such as Rotary Compression pumps, and the vacuum chamber. COMPARATIVE ADVANTAGES The roots pump is never used as a stand alone pump in high vacuum applications but its high pumping speed can be used to reduce the end pressure and increase the pumping speed of other vacuum pump systems in the medium to low vacuum range. EXTERNAL LINKS
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