Turbine vacuum pump, also known as turbine molecular pump, is an oil-free high vacuum equipment based on the principle of momentum transfer. Its core lies in the synergistic effect of high-speed rotating moving blades and stationary blades, which transport gas molecules in a molecular flow state to the exhaust port in a directional manner,

The inter stage reflux of a multi-stage centrifugal blower refers to the non ideal flow phenomenon in which gas fails to enter the inlet of the next stage impeller smoothly after the outlet of the previous stage impeller,

​The core working principle of a multi-stage centrifugal blower is based on a series cascade compression mechanism, which achieves a stepped increase in gas pressure by sequentially arranging multiple impellers on the same axis. Gas is sucked into the first stage impeller axially and is radially ejected under the centrifugal force generated by high-speed rotation,

The future development trend of multi-stage centrifugal blowers is accelerating towards ultra-high efficiency,full intelligence,energy synergy,and green life cycle.Its technological boundary has been upgraded from a single device to a key node

As an important category of centrifugal blowers, multi-stage centrifugal blowers are subject to basic national standards covering product definition, classification, and general technical requirements.