Shaft seal system for bidirectional movement of transmission shaft of multistage pump

The invention discloses a shaft seal system for bidirectional movement of a transmission shaft of a multistage pump, which is characterized in that an atmosphere side static ring seat is mounted on a shaft sleeve at the lower part of a bearing seat, an atmosphere side static ring is mounted on the atmosphere side static ring seat, and a bearing inner ring of a bearing is matched with the shaft sleeve through an interference support ring; the pump efficiency ring is installed on an atmosphere side moving ring seat located between a siphon inlet and a siphon outlet, an atmosphere side moving ring is installed in the atmosphere side moving ring seat, a medium side static ring and a medium side moving ring are installed on a shaft sleeve at the lower end of the atmosphere side moving ring seat in a matched mode, and a particle blocking spring seal is installed on an elastic sealing cavity. An elastic element of the elastic sealing cavity and a structural part of the elastic sealing cavity are welded together, and