| 摘要 |
A single-shaft vacuum positive displacement pump ( 10 ) comprises two pump stages ( 12,14 ) each provided with a pump rotor ( 13,15 ) and a drive motor ( 16 ). The drive motor ( 16 ) is axially arranged between the two pump stages ( 12,14 ), wherein the shaft ( 22 ) supports the pump rotors ( 13,15 ) and the motor rotor ( 17 ).
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