Thrust balancing structure for turbomachinery

The thrust balance structure comprises an impeller back disc of the impeller machine and a fixed balance part installed on the impeller machine, the area of the impeller back disc is a set area, the impeller back disc can apply variable balance force to a rotor, and the variable balance force and variable axial thrust borne by the rotor are equal in magnitude and opposite in direction. The variable axial thrust can be changed, the fixed balance part can apply fixed balance force to the rotor, the fixed balance force and the fixed axial thrust borne by the rotor are equal in size and opposite in direction, and the fixed axial thrust is fixed. According to the thrust balance structure, the variable axial thrust borne by the rotor during operation is counteracted through the impeller back disc with the set area, then the fixed balance piece used for counteracting the fixed axial thrust is arranged on the impeller machine, it can be guaranteed that the stress of the rotor in the axial direction is balanced, in th