Lobe pump
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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 used as an engine supercharger.source:Wikipedia
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