| 摘要 |
A screw pump comprises a pair of rotors ( 92, 94 ) each carrying an external screw thread ( 96, 98 ), the pair of rotors being rotatably mounted in a stator ( 72 ) and arranged such that, in operation, the screw threads of the rotors intermesh as the rotors rotate in opposing directions. Means ( 100, 102 ) are provided for actively controlling the axial position of the rotors within the stator during use of the pump.
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