Research on axial force balancing device for large vertical multistage centrifugal pumps
For the problem of axial force balancing of multistage centrifugal pump,research was conducted on the axial force balancing device for large-scale vertical multistage pumps,and its axial force balancing effect under different flow rates and number of pump stages was analyzed and compared.Numerical simulation and prototype testing were employed to calculate and measure the axial force of the pump and thrust of the balancing device.And the variations of axial force and thrust under different conditions were compared.The calculation results show that the axial force of the multistage pump and thrust of the balancing device is negatively correlated with the flow rate,and the axial force balancing effect is enhanced with the increase of flow rate.With the increase of number of pump stages,the axial force of the multistage pump exhibits an ascending trend,and the relationship between the axial force and number of pump stages shows a nonlinear multiple relationship,the axial force of a six-stage pump is approximately 2.5 times that of a three-stage pump,the axial force balancing effect of the thrust device becomes weaker with the increase of number of pump stages.The axial force balancing device can effectively balance the axial force of large vertical multistage centrifugal pump,and can balance more than 50%of the axial force of the pump under various working conditions.Additionally,the thrust estimation based on the head is close to the experimental results,which can be used as a rapid estimation method for the thrust of the balancing device.The research results can privide reference for the design and opplication of multistage centrifugal pumps.
multistage centrifugal pumpaxial forcenumerical simulationaxial force balancing devicesthrust calculation
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