Axial force balance method for floating impeller of shielded centrifugal pump
A floating impeller design with axial force self-balancing capability was proposed to balance the axial force of the centrifugal impeller of the shielded pump.The mechanism and influencing factors of the axial force balance were analyzed through three-dimensional numerical simulation of the full flow path.Numerical calculations were conducted under various operating conditions and impeller positions after validating the simulation method.Results show that leakage decreases,head and efficiency increase when moving towards the inlet within the impeller's floating range.The closer towards the inlet,the more significant impact on the pump performance is.The axial force initially decreases but then increases.The direction points to the pump inlet when it is far from the inlet.The impeller axial force increases rapidly to realize the reverse when it is close to the pump inlet,pointing to the pump outlet and helping the impeller stop moving to the inlet.This trend of axial force change can make the impeller always be in a floating state when working and realize the axial force self-balancing.
centrifugal pumpfloating impelleraxial positionaxial force
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