| 摘要 |
A scroll pump 60 comprising a scroll mechanism 62 having an orbiting scroll 64 and a fixed scroll 66; a drive shaft having a concentric shaft portion 68 and an eccentric shaft portion 70 connected to the orbiting scroll. The shaft is arranged to be driven by a motor 72 so that rotation of the shaft imparts an orbiting motion to the orbiting scroll relative to the fixed scroll for pumping fluid along a flow path from an inlet 74 to an outlet 76 of the scroll mechanism. An axial lip seal 88 is located between the orbiting scroll and. the fixed scroll for resisting leakage of fluid from outside the scroll mechanism into the flow path. Preferably the seal is fixed relative to the orbiting scroll or the fixed scroll and seals against the other of the orbiting scroll or the fixed scroll so that an orbiting motion is imparted to the seal relative to the other scroll. |
