Flush toilet apparatus

Abstract

The present invention provides a flush toilet apparatus that includes a flush toilet body including a bowl and having a rim water ejection port, a drain trap pipeline, and a jet water ejection port; a flush water tank body; a rim drain valve; and a jet drain valve, in which the flush toilet apparatus has an exhaust path along which air of an air layer formed in an upstream side of a jet water conduit is discharged, in which the rim-water-ejection drain port and the jet-water-ejection drain port are each provided at a position higher than the lower end of the rim water ejection port, and in which flush water is supplied into the jet water conduit after a flush is started and before the jet drain valve is opened.

What is claimed is: 
     
         1 . A flush toilet apparatus that flushes with flush water stored in a flush water tank, the flush toilet apparatus comprising:
 a flush toilet body that includes a bowl and has a rim water ejection port provided in an upper portion of the bowl, a drain trap pipeline extending from a lower portion of the bowl, and a jet water ejection port provided to face an inlet of the drain trap pipeline;   a flush water tank body that stores flush water for flushing the bowl of the flush toilet body;   a rim drain valve that stops or allows flush water to be ejected through the rim water ejection port via a rim water conduit provided in the flush toilet body, the rim drain valve being provided at a rim-water-ejection drain port formed in the flush water tank body; and   a jet drain valve that stops or allows flush water to be ejected through the jet water ejection port via a jet water conduit provided in the flush toilet body, the jet drain valve being provided at a jet-water-ejection drain port formed in the flush water tank body,   wherein the flush toilet apparatus has an exhaust path along which air of an air layer formed in an upstream side of the jet water conduit is discharged,   wherein the rim-water-ejection drain port and the jet-water-ejection drain port are each provided at a position higher than a lower end of the rim water ejection port, and   wherein flush water is supplied into the jet water conduit after a flush is started and before the jet drain valve is opened.   
     
     
         2 . The flush toilet apparatus according to  claim 1 ,
 wherein flush water is supplied into the jet water conduit by, after a flush is started and before the jet drain valve is opened, opening the rim drain valve to allow flush water to be ejected through the rim water ejection port and to thereby allow flush water to flow in through the jet water ejection port.   
     
     
         3 . The flush toilet apparatus according to  claim 2 ,
 wherein supply of flush water into the jet water conduit causes a water level in the jet water conduit to rise, and, at a point of time when the jet drain valve is opened, a water level in the drain trap pipeline rises to be higher than a water level in the jet water conduit.   
     
     
         4 . The flush toilet apparatus according to  claim 1 ,
 wherein a cross-sectional area of the jet water ejection port is larger than a cross-sectional area of the rim water ejection port.   
     
     
         5 . The flush toilet apparatus according to  claim 4 ,
 wherein ejection of flush water through the rim water ejection port forms a swirling flow on an inner wall surface of the bowl, and the swirling flow makes one or more revolutions in the bowl.   
     
     
         6 . The flush toilet apparatus according to  claim 1 ,
 wherein the jet drain valve is opened when or after a water level in the jet water conduit rises to a highest position.   
     
     
         7 . The flush toilet apparatus according to  claim 1 ,
 wherein one end of the exhaust path in communication with an inside of the jet water conduit is open at a position higher than a water surface that has risen in the jet water conduit due to supply of flush water into the jet water conduit.   
     
     
         8 . The flush toilet apparatus according to  claim 7 ,
 wherein one end of the exhaust path is open upward in a ceiling surface of the jet water conduit.   
     
     
         9 . The flush toilet apparatus according to  claim 1 ,
 wherein the exhaust path is configured such that an inside of the jet water conduit is in communication with outside air.   
     
     
         10 . The flush toilet apparatus according to  claim 9 ,
 wherein the exhaust path is configured such that an inside of the jet water conduit and an air layer in the flush water tank body are in communication with each other.   
     
     
         11 . The flush toilet apparatus according to  claim 1 ,
 wherein the jet water conduit is configured such that an air layer remains inside the jet water conduit even in a state in which flush water has been supplied into the jet water conduit before the jet drain valve is opened.   
     
     
         12 . The flush toilet apparatus according to  claim 1 ,
 wherein the jet water conduit is configured such that an air pocket is formed inside the jet water conduit after the jet drain valve is opened.   
     
     
         13 . The flush toilet apparatus according to  claim 1 ,
 wherein the rim drain valve and the jet drain valve are configured to be driven based on drive inputs that differ from each other, and   wherein one end side of the exhaust path is open inside the jet water conduit, and another end side of the exhaust path is open in an atmospheric region.   
     
     
         14 . The flush toilet apparatus according to  claim 13 ,
 wherein the one end side of the exhaust path is open inside an upstream region located directly under the jet drain valve or inside an intermediate region extending forward from the upstream region in plan view.   
     
     
         15 . The flush toilet apparatus according to  claim 14 ,
 wherein a downstream region extending to the jet water ejection port is connected to the intermediate region, and   wherein a water surface formed, after the jet drain valve is opened and flush water reaches the jet water ejection port, by a water flow of flush water in the upstream region in which the one end side of the exhaust path is open or in the intermediate region is determined depending on a position at which the one end side of the exhaust path is open, and an enclosed water flow of flush water is formed from the upstream region to the jet water ejection port via the intermediate region and the downstream region.   
     
     
         16 . The flush toilet apparatus according to  claim 15 ,
 wherein, after the jet drain valve is opened and flush water reaches the jet water ejection port,
 a flow rate of flush water that flows in the upstream region is larger than a flow rate of flush water that flows in the intermediate region, and 
 a flow rate of flush water that flows in the intermediate region is larger than a flow rate of flush water that flows in the downstream region. 
   
     
     
         17 . The flush toilet apparatus according to  claim 13 ,
 wherein the exhaust path is formed by a pipeline member that is formed integrally with the rim drain valve and/or the jet drain valve, and   wherein the other end side of the exhaust path is open in an upper-side space inside the flush water tank body.   
     
     
         18 . The flush toilet apparatus according to  claim 13 ,
 wherein the exhaust path is provided with a check valve.   
     
     
         19 . The flush toilet apparatus according to  claim 13 ,
 wherein the other end side of the exhaust path is open in a space outside the flush water tank body.   
     
     
         20 . The flush toilet apparatus according to  claim 13 ,
 wherein the one end side of the exhaust path is located above a water level of retained water.