Patent ID: 8069503

Claim:
A quantitative refill for a water saving toilet being disposed in a water tank, inside the water tank being disposed an inlet valve, a double function flush valve, an overflow pipe connected to the flush valve, and a refill pipe connected to the inlet valve, the quantitative refill device comprising: a first pipe with a lower end fixed to a top end of the overflow pipe defining a first chamber and an outlet which is in communication with a lower end of the first chamber and the overflow pipe; a second pipe fixed in the first chamber of the first pipe, an outer surface of the second pipe and an inner surface of the first chamber defining a water flow passage therebetween, a top end of the water flow passage defining an overflow inlet for allowing water in the water tank to overflow, a lower end of the water flow passage being connected to the outlet of the first pipe, the second pipe being defined a second chamber therein, and in the second chamber the water is refilled from the refill pipe, a lower edge of the second pipe tapering upwards to form a conical surface, and then the conical surface extending upwards to form a through hole in communication with the second chamber; a float device comprising a float body, a rod portion extending downwards from a bottom of the float body, and a sealing portion extending downwards from a bottom of the rod portion, the float body being received in the second chamber of the second pipe, the rod portion being inserted through the through hole of the second pipe in such a manner that an outer periphery of the rod portion and an inner surface of the through hole define a water flow passage therebetween, the sealing portion being defined with a conical surface shaped correspondingly to the conical surface of the second pipe, and in normal condition, the sealing portion, under the effect of the gravity of the float device, defines a conical passage with respect to the conical surface of the second pipe, the conical passage enables an outflow of water flowing therethrough to be controlled to be smaller than an inflow of water refilled into the second chamber from the refill pipe, at the beginning of a water refilling process, water flows to the second chamber and then to the water flow passage and the conical passage and finally into the overflow pipe, to provide enough water to form a water closing, after that, the float body will move upward along with a rise of a water level of the second chamber and drive the whole float device to move upward, making the conical surface press against the conical surface, so as to close the conical passage after the water has been refilled for a predetermined time, creating a quantitative water refilling effect, and surplus water will overflow into the water tank from a top end of the second chamber, when the conical passage is closed, the water in the second chamber can still be leaked into the overflow pipe by a leakage design.