External axial force balancing device and mounting method thereof

The invention relates to an external axial force balancing device and a mounting method thereof. The device mainly comprises a base, a cylinder, cylinder covers, a piston disk, a rotating shaft, couplings, a left pipe joint, a right pipe joint, a first connecting pipe, a second connecting pipe, a first flange pipe and a second flange pipe. The piston disk is arranged on the rotating shaft, the piston disk and the rotating shaft are arranged in the cylinder together, the piston disk divides the inner chamber of the cylinder into a left chamber and a right chamber, two ends of the rotating shaft respectively penetrate out of the cylinder covers at two ends of the cylinder, and the couplings are respectively arranged on two end parts of the rotating shaft; the left pipe joint is arranged on the left side of the cylinder and is connected with the first pipe joint on the first flange pipe by the first connecting pipe; and the right pipe joint is arranged on the right side of the cylinder and is connected with the second pipe joint on the second flange pipe by the second connecting pipe. The external axial force balancing device is reasonable in design, simple in structure, low in fault rate, flexible in use and easy to maintain, and can be used for modifying existing multistage centrifugal pumps.