Flush toilet apparatus

Abstract

The present invention provides a flush toilet apparatus ( 1 ) including a flush toilet main body ( 2 ), and a flush water tank device ( 4 ), in which the flush water tank device includes a flush water tank main body ( 26 ), a discharge port ( 30 e ), an annular seat surface ( 26 d ), a discharge valve ( 28 ) seated on the seat surface, an exhaust passage ( 28 b ) that communicates between a space below the seat surface and a space above a water surface in the flush water tank main body in a state in which the discharge valve is seated on the seat surface, and a guide part provided in the discharge valve or in a bottom portion of the flush water tank main body to suppress contraction and merging of flows of flush water toward a center from a periphery of the seat surface when the flush water is discharged.

1 . A flush toilet apparatus that performs flushing with flush water stored in a flush water tank device, the flush toilet apparatus comprising:
 a flush toilet main body that includes a bowl and a water inlet into which the flush water for flushing the bowl flows; and   a flush water tank device that stores the flush water for flushing the bowl, wherein   the flush water tank device includes:   a flush water tank main body that stores the flush water;   a discharge port from which the flush water in the flush water tank main body is discharged to flow into the water inlet of the flush toilet main body;   an annular seat surface provided to surround the discharge port;   a discharge valve that is seated on and detached from the seat surface, so that the flush water is discharged and stopped from the flush water tank main body;   an exhaust passage that communicates between a space below the seat surface and a space above a water surface of the flush water stored in the flush water tank main body in a state in which the discharge valve is seated on the seat surface; and   a guide part provided in the discharge valve or in a bottom portion of the flush water tank main body to suppress contraction and merging of flows of flush water toward a center from a periphery of the seat surface when the flush water in the flush water tank main body is discharged.   
     
     
         2 . The flush toilet apparatus according to  claim 1 , wherein
 the guide part is a contraction and merging suppression part provided in the discharge valve, the discharge valve is configured to be pulled upward from the seat surface, and the exhaust passage is provided in the discharge valve and is configured to communicate between a lower end of the contraction and merging suppression part and a space above the water surface of the flush water stored in the flush water tank main body.   
     
     
         3 . The flush toilet apparatus according to  claim 2 , wherein
 the contraction and merging suppression part is a projection provided in a lower end of the discharge valve and extending downward with respect to the seat surface in a state in which the discharge valve is seated on the seat surface.   
     
     
         4 . The flush toilet apparatus according to  claim 2 , wherein
 a water passageway extending from the water inlet of the flush toilet main body is water-sealed by the flush water stored in the flush toilet main body, and an air layer is formed between the seat surface and a water seal surface in the water passageway.   
     
     
         5 . The flush toilet apparatus according to  claim 1 , wherein
 the flush water tank device further includes a flow guide part which is a wall surface provided outside of the seat surface to surround the seat surface.   
     
     
         6 . The flush toilet apparatus according to  claim 5 , wherein
 a water passageway extending from the water inlet of the flush toilet main body is water-sealed by the flush water stored in the flush toilet main body, a discharge passage in which a cross-sectional area of a flow channel decreases downward is formed between the seat surface and the discharge port, and in a vertical plane, straight lines that pass through an upper end of the flow guide part and are tangent to an inner wall surface of the discharge passage intersect below a water seal surface of the water passageway of the flush toilet main body.   
     
     
         7 . A flush toilet apparatus that performs flushing with flush water stored in a flush water tank device, the flush toilet apparatus comprising:
 a flush toilet main body that includes a bowl and a water inlet into which the flush water for flushing the bowl flows; and   a flush water tank device that stores the flush water for flushing the bowl, wherein   the flush water tank device includes:   a flush water tank main body that stores the flush water;   a discharge port from which the flush water in the flush water tank main body is discharged to flow into the water inlet of the flush toilet main body;   an annular seat surface provided to surround the discharge port;   a discharge valve that is seated on and detached from the seat surface, so that the flush water is discharged and stopped from the flush water tank main body; and   an overflow pipe that communicates between a lower end opening that is opened in a space below the seat surface and an upper end opening that is opened on an upper side with respect to a water surface of the flush water stored in the flush water tank main body, wherein   a water passageway extending from the water inlet of the flush toilet main body is water-sealed by the flush water stored in the flush toilet main body, and
 the discharge valve is configured to be detached from the seat surface by being turned about a pivot shaft provided on one end portion, and the lower end opening of the overflow pipe is provided on an opposite side of the pivot shaft. 
   
     
     
         8 . The flush toilet apparatus according to  claim 1 , wherein the flush water tank main body includes a discharge passage formed to extend downward from a bottom surface, the guide part is a flow guide part that is provided in a bottom portion of the flush water tank main body and decreases a flow velocity of flush water toward a center of the discharge passage in the flush water tank main body, and the flow guide part is an encirclement wall surface provided outside of the seat surface to surround the seat surface. 
     
     
         9 . The flush toilet apparatus according to  claim 8 , wherein the flow guide part has an upper end located above a tangent line in an inlet of the discharge passage in a vertical cross section. 
     
     
         10 . The flush toilet apparatus according to  claim 8 , wherein the discharge valve is configured to be pulled upward from the seat surface, and in a state in which the discharge valve is pulled up to a highest position, a vertical distance from an upper end of the encirclement wall surface to the discharge valve is a half or more of a vertical distance from the seat surface to the discharge valve. 
     
     
         11 . The flush toilet apparatus according to  claim 8 , wherein the encirclement wall surface surrounding the seat surface has cuts formed in portions of the encirclement wall surface.