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- W95556309 abstract "The chapter narrates the functioning of roots pumps. Roots pumps are rotary pumps operating on the positive displacement principle. The pumping mechanism consists of two counter-rotating impellers of figure-of-eight design. Both impellers are synchronized by a gear drive (ratio 1:1) which enables them to rotate with little play both to each other and the housing. The gaps resulting between the impeller and the housing and between the impellers themselves are kept as small as possible. The effective quantity of gas transferred by a roots pump is calculated from the theoretical transported quantity and the back streaming quantity. In contrast to the rotary vane and rotary piston pumps, the pump chamber of a roots pump is free of any sealing material or lubricant. Oil is only found in a separate side chamber used to lubricate the gear drive and the rotor bearings. Roots pumps with built-in motors operating under the normal supply voltage range are in the region of critical voltage break down. The danger of arcing is high, especially in areas of weak insulation, which considerably reduces the working life of the motor." @default.
- W95556309 created "2016-06-24" @default.
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- W95556309 date "1995-01-01" @default.
- W95556309 modified "2023-09-27" @default.
- W95556309 title "Leak-proof Roots vacuum pumps" @default.
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- W95556309 doi "https://doi.org/10.1016/b978-185617230-1/50013-4" @default.
- W95556309 hasPublicationYear "1995" @default.
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