Variable-frequency speed-regulating centrifugal pump for axial force balance

The invention discloses a variable-frequency and variable-speed centrifugal pump for axial force balance, which comprises a variable-frequency and variable-speed motor, an impeller inlet sealing flow guide structure, an impeller rear side pressure balance sealing structure and a volute impeller side inner wall surface buffer groove structure, the impeller inlet sealing flow guide structure is arranged on the impeller inlet side and is used for flow guide and sealing, and the impeller rear side pressure balance sealing structure is arranged on the volute impeller side inner wall surface buffer groove structure. The impeller rear side pressure balance sealing structure is arranged between the impeller and the volute rear cover plate and used for pressure balance and sealing, and the volute is provided with the volute impeller side inner wall face buffer groove structure for buffering and balance maintaining. According to the variable-frequency speed regulation centrifugal pump, the pump axial force has a good b