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Because rotary lobe pumps need to maintain a clearance between the lobes, a single stage Roots blower can pump gas across only a limited pressure differential. If the pump is used beyond its specification, the compression of the gas generates enough heat so that the lobes expand to the point that they jam, damaging the pump.
Philander and Francis Roots, founders of Roots Blower Company Cover story of February 1880 Scientific American magazine, Manufacture of Rotary Pressure Blowers at Roots, Indiana A Roots blower with two-lobed rotors. Modern Roots blowers may have 2- or 3-lobed rotors.
A lobe pump, or rotary lobe pump, is a type of positive displacement pump. It is similar to a gear pump except the lobes are designed to almost meet, rather than touch and turn each other. An early example of a lobe pump is the Roots Blower , patented in 1860 [ 1 ] to blow combustion air to melt iron in blast furnaces, but now more commonly ...
The modern helical lobe screw compressor was developed in Sweden by Alf Lysholm who was the chief engineer at Ljungstroms Angturbin. Lysholm developed the screw compressor while looking for a way to overcome compressor surge in gas turbines. Lysholm first considered a roots type blower but found this was unable to generate a high enough ...
Rotary-type positive displacement: internal and external gear pump, screw pump, lobe pump, shuttle block, flexible vane and sliding vane, circumferential piston, flexible impeller, helical twisted roots (e.g. the Wendelkolben pump) and liquid-ring pumps; Reciprocating-type positive displacement: piston pumps, plunger pumps and diaphragm pumps
The Roots supercharger dates back to the 1860s, and this is the basis for the original Wade supercharger, but with patented modifications incorporated. The first patent of Costin and Densham deals with ways to achieve compression within the Roots-style blower. [ 2 ]
The Roots blower is one example of a vacuum pump. A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. [1]
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