Replace-free mechanical sealing structure

The invention provides a replace-free mechanical sealing structure and relates to the technical field of sealing structures. The replace-free mechanical sealing structure comprises a standby sealing group and a sealing group isolation pad. The standby sealing group comprises a clamping plate, a stationary seal ring sleeve and a spring. The clamping plate is arranged at the upper end of a sealing gland, the stationary seal ring sleeve comprises a first stationary seal ring sleeve body parallel to an axial surface and a second stationary seal ring sleeve body perpendicular to the axial surface,a positioning groove is formed in the upper end of the first stationary seal ring sleeve body, the spring is arranged at the bottom end of the sealing gland, the sealing gland is connected to the second stationary seal ring sleeve body through the spring, and the lower end surface of the second stationary seal ring sleeve body and the upper end of the sealing group isolation pad are arranged oppositely. The replace-free m