Patent ID: 8112829

Claim:
A flush valve assembly structure of a water tank, comprising: a valve seat, mounted and fixed on the water tank, and having a longitudinal through hole, and a support rib extending into the longitudinal through hole; a guide rod, having a fixing portion on a bottom end, wherein the fixing portion is mounted and fixed on the support rib of the valve seat, and a guide portion is disposed above the fixing portion; a canister flush valve, closing the longitudinal through hole of the valve seat in a normal state, and having an annular bottom wall, wherein an inner cylindrical wall and an outer cylindrical wall extend upward from an inner side and an outer side of the bottom wall respectively, so as to define an annular chamber in the inner cylindrical wall, the outer cylindrical wall, and the bottom wall, and flush water flows into the chamber; an inner edge surface of the inner cylindrical wall is guided and positioned by the guide portion of the guide rod, and at least one via in a predetermined shape is arranged in the bottom wall; the canister flush valve has an upward displacement along the guide portion of the guide rod, so as to be separated from the valve seat to form a valve port; and a spraying assembly, mounted and fixed on a top end of the guide rod, wherein a part of supplemented flush water flows into the spraying assembly, and forms an umbrella-shaped spray water flow that flows into the chamber of the canister flush valve.