Flush toilet apparatus

Abstract

A flush toilet apparatus includes a tank and a jet pump unit. A throat pipe of the jet pump unit includes: a first linear portion formed to linearly extend obliquely upward from a suction port; and a second linear portion formed to linearly extend toward an inlet of a water conduit on a lower side, and the entire throat pipe is in an inverted U-shape when viewed from the side. The throat pipe is arranged so that an angle between a central axis of the second linear portion and a vertical direction is smaller than an angle between a central axis of the first linear portion and the vertical direction when viewed from the side.

What is claimed is: 
     
         1 . A flush toilet apparatus that discharges waste to a drain pipe by wash water, the flush toilet apparatus comprising:
 a toilet body comprising a bowl portion that receives waste, wherein a water conduit for guiding water supplied as wash water to the bowl portion is formed inside;   a tank storing water inside and arranged on a backward upper part of the toilet body so as to be able to supply the water to an inlet of the water conduit; and   a jet pump unit arranged inside of the tank,   the jet pump unit comprising:   a throat pipe, wherein one end is connected to the inlet of the water conduit, a suction port is formed on the other end, and the throat pipe is arranged so that the suction port is positioned on a lower part of the inside of the tank; and   a nozzle that injects high-speed water toward the inside of the throat pipe from the suction port to induce a jet pump action, wherein   the throat pipe comprises:   a first linear portion formed to linearly extend obliquely upward from the suction port;   a curved portion that is a part on a downstream of the first linear portion and that is in a curved shape; and   a second linear portion that is a part on the downstream of the curved portion and that is formed to linearly extend toward the inlet of the water conduit on a lower side, the entire throat pipe is in an inverted U-shape when viewed from the side, and   the throat pipe is arranged so that an angle between a central axis of the second linear portion and a vertical direction is smaller than an angle between a central axis of the first linear portion and the vertical direction when viewed from the side.   
     
     
         2 . The flush toilet apparatus according to  claim 1 , wherein
 the tank comprises: a first tank portion; and a second tank portion formed so as to extend part of a bottom wall of the first tank portion downward, and   the suction port is arranged at a position overlapping with the second tank portion when viewed from the top.   
     
     
         3 . The flush toilet apparatus according to  claim 2 , wherein
 the first linear portion is formed so that a channel cross-sectional area in the downstream is smaller than a channel cross-sectional area in an upstream.   
     
     
         4 . The flush toilet apparatus according to  claim 3 , wherein
 an entire inner wall surface of the first linear portion is smooth, and the first linear portion is formed so that the channel cross-sectional area gradually changes from the upstream to the downstream.   
     
     
         5 . The flush toilet apparatus according to  claim 4 , wherein
 an entire inner wall surface of the second linear portion is smooth, and the second linear portion is formed so that the channel cross-sectional area gradually changes from the upstream to the downstream.   
     
     
         6 . The flush toilet apparatus according to  claim 2 , wherein
 the first linear portion is arranged so that the central axis of the first linear portion is inclined relative to a front-back direction of the tank when viewed from the top.   
     
     
         7 . The flush toilet apparatus according to  claim 2 , further comprising:
 an operation lever attached to an outside surface of the tank;   a valve unit that is arranged inside of the tank and that is for switching open/close of a channel for supplying water to the nozzle; and   a transmission mechanism for transmitting movement of the operation lever to the valve unit, wherein   at least one of the valve unit and the transmission mechanism is arranged above the first linear portion in an internal space of the tank.