| 摘要 |
A multi-stage pump has a housing defining a plurality of stages each having an internal rotor enclosure with each enclosure having a non-pumping inlet and outlet. A plurality of rotor assemblies are operatably contained in housing extending through all of the stages. The rotor assemblies and rotor enclosures are shaped to provide a smaller inlet volumetric delivery rate at the last (downstream or outlet) stage than at the first (upstream or inlet) stage. A plurality of fluid lines connect the non-pumping chambers to enable the pump to handle liquid so that, as the rotor assemblies are rotated, a fluid stream entering the pump inlet is subjected to a pumping action to transport the fluid stream to exit through the pump outlet.
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