Double-end-face mechanical sealing device and method for pump for media containing impurities and easy to crystallize

The invention relates to the technical field of mechanical sealing, and provides a double-end-face mechanical sealing device and method for an impurity-containing and easy-to-crystallize medium pump, and the double-end-face mechanical sealing device comprises a pump shaft, a shaft sleeve, a movable ring seat, a medium side seal, an atmosphere side seal, a medium, a cooling water cavity, a sealing cavity and a water flow indicator, compared with a traditional double-end-face mechanical sealing system, the cooling water tank and the cooling water pipeline connected with an external water source are additionally arranged, and during normal operation, the water flow indicator impeller does not act; the impeller of the water flow indicator rotates when sealing leakage occurs. If air side sealing leakage occurs, leaked water can be directly seen; if the medium side seal leaks, leaked water cannot be seen, and the severity of leakage can be judged according to the rotating speed of the impeller of the water flow ind