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- W3021638710 abstract "Publisher SummaryRoots-type blower systems composed of blowers and backing pumps are almost universally used in vacuum systems where large gas loads are pumped in the intermediate vacuum range and/or volumes must be evacuated in a relatively short time. They are used as primary pumps at intermediate vacuum levels, for rough pumping to the vacuum level where high-vacuum pumps can be effectively employed, and, where required, as backing for high-vacuum pumps. In some systems, the blower system provides all three functions. This chapter provides information on pumping principles, operating characteristics, and limitations of blower systems required to assist users in proper application and problem diagnostics. The blower has no valves and depends on close clearances to minimize backflow from discharge to the inlet pressure. The amount of gas that flows back through the clearances reduces the net effective pumping speed. Efficiency is measured by the ratio of the actual volume of gas pumped to the gross displacement or theoretical maximum pumping speed. Impeller clearances vary with blower size, but typically are on the order of 0.25 mm. At high pressures, with a compression ratio of 2 (or higher), backflow is sonic and turbulent and is a function of upstream pressure. As suction pressure decreases, flow may become viscous and backflow will be a product of the differential pressure time clearance conductance." @default.
- W3021638710 created "2020-05-13" @default.
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- W3021638710 date "1998-01-01" @default.
- W3021638710 modified "2023-09-26" @default.
- W3021638710 title "Vacuum Blowers" @default.
- W3021638710 doi "https://doi.org/10.1016/b978-012352065-4/50053-5" @default.
- W3021638710 hasPublicationYear "1998" @default.
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