Flush toilet apparatus

Abstract

A flush toilet apparatus according to the present invention includes: a flush toilet body including a bowl portion, a rim spout port, a drain trap pipe, and a jet spout port; a flush water tank body; a rim spouting/stopping switch mechanism that spouts or stops flush water from the rim spout port; and a jet spouting/stopping switch mechanism that spouts or stops flush water from the jet spout port. The flush toilet apparatus executes a flushing sequence including a first step of starting rim spouting, a second step of starting jet spouting in a state in which rim spouting is continued and activating a siphon action in the drain trap pipe, and a third step of continuing rim spouting while stopping jet spouting.

What is claimed is: 
     
         1 . A flush toilet apparatus that performs flushing by using flush water stored in a flush water tank, comprising:
 a flush toilet body including
 a bowl portion, 
 a rim spout port provided in an upper part of the bowl portion, 
 a drain trap pipe extending from a lower part of the bowl portion, and 
 a jet spout port provided so as to face an inlet of the drain trap pipe; 
   a flush water tank body that stores flush water for flushing the bowl portion of the flush toilet body;   a rim spouting/stopping switch mechanism that spouts or stops flush water stored in the flush water tank body from the rim spout port via a rim water channel provided in the flush toilet body; and   a jet spouting/stopping switch mechanism that spouts or stops flush water stored in the flush water tank body from the jet spout port via a jet water channel provided in the flush toilet body,   wherein the rim spouting/stopping switch mechanism and the jet spouting/stopping switch mechanism execute a flushing sequence including
 a first step of starting spouting of flush water from the rim spout port, 
 a second step of starting spouting of flush water from the jet spout port after the first step in a state in which spouting of flush water from the rim spout port is continued and activating a siphon action in the drain trap pipe, and 
 a third step of continuing spouting of flush water from the rim spout port after the second step while stopping spouting of flush water from the jet spout port. 
   
     
     
         2 . The flush toilet apparatus according to  claim 1 , wherein the second step is executed after a water level of standing water in the bowl portion has risen due to the first step. 
     
     
         3 . The flush toilet apparatus according to  claim 2 , wherein the second step is executed after flush water in the drain trap pipe has started overflowing. 
     
     
         4 . The flush toilet apparatus according to  claim 2 , wherein the first step, the second step, the third step differ from each other in a length of execution time. 
     
     
         5 . The flush toilet apparatus according to  claim 4 , wherein an execution time of the third step is longer an execution time of each of the first step and an execution time of the second step. 
     
     
         6 . The flush toilet apparatus according to  claim 5 , wherein the execution time of the first step is longer than the execution time of the second step. 
     
     
         7 . The flush toilet apparatus according to  claim 2 , wherein the first step, the second step, and the third step differ from each other in an instantaneous flow rate of flush water spouted from the rim spout port. 
     
     
         8 . The flush toilet apparatus according to  claim 7 , wherein an instantaneous flow rate of flush water spouted from the rim spout port in the third step is lower than an instantaneous flow rate of flush water spouted from the rim spout port in each of the first step and the second step. 
     
     
         9 . The flush toilet apparatus according to  claim 1 ,
 wherein the rim spouting/stopping switch mechanism is a first drain valve that switches between spouting and stopping of flush water from a rim spout port provided in an upper edge part of the bowl portion by opening and closing a first drain port provided in the flush water tank body,   wherein the jet spouting/stopping switch mechanism is a second drain valve that switches between spouting and stopping of flush water from a jet spout port provided on a front side of a lower part of the bowl portion by opening and closing a second drain port provided in the flush water tank body,   wherein the first drain valve and the second drain valve are configured to be driven based on drive inputs that differ from each other,   wherein a jet water channel extending from the second drain valve to the jet spout port includes
 an upstream region that is positioned directly below the second drain valve, 
 an intermediate region that extends forward from the upstream region in plan view, and 
 a downstream region that extends sideward from a front side region of the intermediate region below a water level of standing water, circumvents the lower part of the bowl portion and/or the drain trap pipe, and reaches the jet spout port, 
   wherein a maximum value of an area of a vertical cross section of the intermediate region perpendicular to a front-back direction is larger than a maximum value of an area of a vertical cross section of the upstream region perpendicular to the front-back direction, and   wherein the maximum value of the area of the vertical cross section of the intermediate region perpendicular to the front-back direction is larger than a maximum value of an area of a vertical cross section of the downstream region perpendicular to a passage direction.   
     
     
         10 . The flush toilet apparatus according to  claim 9 ,
 wherein, after spouting of water from the jet spout port has been started,   a flow rate of flush water flowing in the upstream region is higher than a flow rate of flush water flowing in the intermediate region, and   the flow rate of flush water flowing in the intermediate region is higher than a flow rate of flush water flowing in the downstream region.   
     
     
         11 . The flush toilet apparatus according to  claim 10 , wherein the maximum value of the area of the vertical cross section of the upstream region perpendicular to the front-back direction is larger than the maximum value of the area of the vertical cross section of the downstream region perpendicular to the passage direction. 
     
     
         12 . The flush toilet apparatus according to  claim 11 , wherein the intermediate region is not filled with water from a time when the second drain valve is opened to a time when the second drain valve is closed. 
     
     
         13 . The flush toilet apparatus according to  claim 9 , wherein the flush water tank is positioned above the rim spout port. 
     
     
         14 . The flush toilet apparatus according to  claim 13 , wherein the flush water tank is integrated with the flush toilet body. 
     
     
         15 . The flush toilet apparatus according to  claim 13 , wherein the flush water tank is separate from the flush toilet body.