Centrifugal compressor structure capable of automatically balancing axial force

The utility model belongs to the field of fluid machinery, and relates to a centrifugal compressor structure capable of automatically balancing axial force, which comprises a first-stage volute and a second-stage volute which are respectively arranged at two ends of a motor shell, and a first-stage impeller and a second-stage impeller which are respectively arranged at two ends of a main shaft in a back-to-back manner, the first-stage impeller and the second-stage impeller are located in the first-stage volute and the second-stage volute correspondingly. A first-stage shaft seal is arranged between the motor shell and the first-stage volute, and a second-stage shaft seal is arranged between the motor shell and the second-stage volute. The back pressure of the first-stage impeller and the back pressure of the second-stage impeller are controlled by adjusting the air inlet pressure of the first-stage shaft seal and the air inlet pressure of the second-stage shaft seal and are respectively balanced with axial fo