Plugging method for inner cavity of lost foam double-suction impeller mold shell

The invention discloses a plugging method for an inner cavity of a lost foam double-suction impeller mold shell. The mold shell is cooled, an inlet of the impeller mold shell is sealed by adopting a sealing film, zircon sand is poured from an outlet of the impeller mold shell, vibrating and tamping are carried out, a mixture of resin, a curing agent and emery are filled into remaining runners, tamping is carried out, the sealing film is removed, and the inlet of the impeller mold shell is sealed by using the mixture of resin, a curing agent and emery. Due to the fact that the zircon sand is large in density and good in flowing performance, the corner of an inlet of each runner can be filled in a compact mode; resin and the curing agent are uniformly mixed with emery, and the strength is high after tamping and hardening are carried out; the emery uniformly mixed with the resin and the curing agent is good in high-temperature collapsibility after being poured, so that inner cavity sand is convenient to clean; a