| 摘要 |
The invention concerns a multi-stage pump, comprising a body with a shaft with a set of centrifugal rotors and a discharging disk, and a set of centrifugal and centripetal stators located between centrifugal rotors, as well as it is fitted with fixed sealing rings used for sealing the centrifugal rotors' necks, and with two sealing rings being the between-stage sealing, characterised in that the hole of every fixed sealing ring (7) and the external surface of every centrifugal rotor neck (3) and the interior aperture of every fixed sealing ring (9) and the external surface of the moving ring (8) are shaped as a truncated cone pointing with its vertex towards the pump suction side.<IMAGE>
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