Toilet bowl flushing apparatus

Abstract

A toilet flushing apparatus for firmly discharging a filth by a small amount of flush water and by a short period of time and still having a flush sound. The toilet flushing apparatus includes a first water supply supplying flush water to a toilet bowl of a toilet main body, a second water supply additionally supplying the flush water, a drain flow path communicated with a downstream side of a water seal portion of the toilet main body, an air sucking mechanism sucking air from the drain flow path, and a control apparatus controlling the first and second water supplies and the air sucking mechanism. The control apparatus produces a siphon operation by operating the air sucking mechanism continuous to operate the first water supply and to open an opening/closing valve through which flush water from the second water supply enters the toilet bowl, after forming a swirl flow inside the toilet bowl and before finishing the siphon operation.

1 . A toilet flushing apparatus comprising:
 first water supply means for supplying flush water to a toilet bowl of a toilet main body;   second water supply means for additionally supplying flush water to the toilet bowl in addition to the flush water supplied from the first water supply means;   a drain flow path continuous to a downstream side of a water seal portion of the toilet main body;   air sucking means for sucking air from the drain flow path; and   control means for controlling the first water supply means, the second water supply means and the air sucking means in flushing the toilet main body;   wherein the first water supply means is constituted to be able to supply the flush water from a rear side of the toilet bowl such that a swirl flow is formed at inside of the toilet bowl;   the second water supply means includes a water tank for storing the flush water, and transporting means for transporting the flush water at inside of the water tank to the toilet bowl by opening an opening/closing valve; and   wherein the control means makes the air sucking means operate to produce a siphon operation continuous to operating the first water supply means and makes the opening/closing valve open after forming the swirl flow and before finishing the siphon operation.   
     
     
         2 . The toilet flushing apparatus according to  claim 1 ,
 wherein the air sucking means includes a negative pressure generating apparatus, and a sucking tank partitioned into a first chamber and a second chamber by an extractable/retractable movable wall;   wherein the first chamber is communicated with the negative pressure generating apparatus by a sucking pipe and communicated with an atmosphere by way of an atmosphere open valve;   wherein the second chamber is communicated with the drain flow path by a communicating path; and   wherein the control apparatus controls the negative pressure generating apparatus and the atmosphere open valve.   
     
     
         3 . The toilet flushing apparatus according to  claim 2 , wherein the negative pressure generating apparatus includes an ejector for generating a negative pressure by passing the flush water, and a negative pressure tank storing a negative pressure produced by sucking air at inside thereof by the ejector and communicated with the first chamber by the sucking pipe. 
     
     
         4 . The toilet flushing apparatus according to  claim 3 , wherein the flush water delivered from the ejector is stored at the water tank. 
     
     
         5 . The toilet flushing apparatus according to  claim 1 , wherein the drain flow path includes a dwell portion dwelled with the flush water and reducing or nullifying a communication area and the air sucking means sucks air from between the water seal portion and the dwell portion. 
     
     
         6 . The toilet flushing apparatus according to  claim 2 , wherein the drain flow path includes a dwell portion dwelled with the flush water and reducing or nullifying a communication area and the air sucking means sucks air from between the water seal portion and the dwell portion. 
     
     
         7 . The toilet flushing apparatus according to  claim 3 , wherein the drain flow path includes a dwell portion dwelled with the flush water and reducing or nullifying a communication area and the air sucking means sucks air from between the water seal portion and the dwell portion. 
     
     
         8 . The toilet flushing apparatus according to  claim 4 , wherein the drain flow path includes a dwell portion dwelled with the flush water and reducing or nullifying a communication area and the air sucking means sucks air from between the water seal portion and the dwell portion.