Water-washing toilet device

Abstract

To provide a flush toilet device capable of suppressing the decrease in the instantaneous flow rate of flush water supplied to a flush toilet body immediately after a drain valve is opened.SOLUTION: A disclosed flush toilet device (1) has a flush toilet body (2) and a flush water tank unit (4). The flush water tank unit includes: a flush water tank body (26); a drain port (30e); an annular seat surface (26d) formed to surround the drain port; a drain valve (28) placed on this seat surface; an exhaust passage (28b) that communicates a space below the seat surface with a space above the surface of flush water stored in the flush water tank body in a state where the drain valve is seated on the seat surface; and a condensation suppression part (28c) provided to the drain valve to suppress condensation of the flush water flow from the periphery of the seat surface to the center when flush water is discharged from the flush water tank body.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a flushing toilet device, and more particularly to a flushing toilet device that performs flushing with the flushing water stored in a flushing water tank device.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2017-133246 (Patent Document 1) describes a drain valve device. In this drain valve device, by pulling up the valve body of the drain valve from the valve seat provided at the bottom of the water storage tank, the flushing water in the water storage tank is made to flow into the drain space (passage), and the flushing water is supplied to the toilet main body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the drain valve device described in Patent Document 1, when the valve body is pulled up from the valve seat, the flushing water in the water storage tank flows into the center of the valve seat all at once. As a result, the air in the drain space on the downstream side of the valve seat is卷入 into the inflowing flushing water, and a state where the air is difficult to be discharged occurs. Thereby, the inflow of the flushing water in the water storage tank into the drain space is temporarily inhibited, and there is a problem that the initial instantaneous flow rate of the flushing water supplied to the toilet main body decreases.

[0005] Therefore, an object of the present invention is to provide a flushing toilet device that can suppress a decrease in the instantaneous flow rate of the flushing water supplied to the flushing toilet main body immediately after opening the drain valve.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, the present invention provides a flush toilet device that performs cleaning with cleaning water stored in a cleaning water tank device, comprising: a flush toilet body equipped with a bowl and an inlet for introducing cleaning water to clean the bowl; and a cleaning water tank device for storing cleaning water to clean the bowl, wherein the cleaning water tank device comprises: a cleaning water tank body for storing cleaning water; a drain port for discharging the cleaning water from the cleaning water tank body and introducing it into the inlet of the flush toilet body; an annular seat surface provided so as to surround the drain port; a drain valve that seats on the seat surface and, by lifting, discharges and stops the cleaning water from the cleaning water tank body; an exhaust passage that, when the drain valve is seated on the seat surface, connects the space below the seat surface with the space above the water level of the cleaning water stored in the cleaning water tank body; and a condensation suppression part provided on the drain valve to suppress the condensation of the flow of cleaning water from the periphery of the seat surface toward the center when the cleaning water from the cleaning water tank body is discharged.

[0007] According to the present invention configured in this way, a condensation suppression unit is provided in the drain valve to suppress the condensation of the flow of flushing water from the periphery of the seat surface toward the center. This suppresses the entrainment of air that was downstream of the seat surface by the flushing water flowing in from the periphery of the seat surface. As a result, the air that was downstream of the seat surface is quickly discharged through the exhaust passage, inhibiting the flow of flushing water by air, and increasing the initial instantaneous flow rate of flushing water supplied to the toilet bowl body.

[0008] In the present invention, preferably, the drain valve is configured to be pulled upward from the seat surface, and the exhaust passage is provided in the drain valve and is configured to connect the lower end of the condensation suppression part with the space above the water surface of the cleaning water stored in the cleaning water tank body.

[0009] According to the present invention configured in this way, the exhaust passage provided in the drain valve connects the lower end of the condensation suppression section with the space above the water surface of the flushing water stored in the flushing water tank body. This allows air downstream of the seat surface to escape quickly to the area above the water surface of the flushing water, thereby significantly reducing the influence of air that was downstream of the seat surface. As a result, the initial instantaneous flow rate of flushing water supplied to the toilet bowl body can be increased.

[0010] In the present invention, preferably, the condensation suppression portion is provided at the lower end of the drain valve and is a protruding portion that extends below the seat surface when the drain valve is seated on the seat surface.

[0011] According to the present invention configured in this way, the condensation suppression portion is provided at the lower end of the drain valve and is composed of a protrusion that extends below the seat surface. This prevents the washing water that flows in from between the drain valve and the seat surface toward the center of the seat surface from merging directly. As a result, condensation of the washing water flow is suppressed and the instantaneous flow rate of the washing water can be increased.

[0012] In the present invention, preferably, the water passage extending from the inlet of the toilet bowl body is sealed by the flushing water stored inside the toilet bowl body, and an air layer is formed between the seat surface and the water-sealing surface of the water passage.

[0013] In a flush toilet system where the water passage extending from the inlet of the toilet body is sealed by the flushing water stored inside the toilet body, the air in the air layer cannot escape into the water passage. According to the present invention configured as described above, the condensation suppression part suppresses the condensation of the flow of flushing water, and an exhaust passage is provided. Therefore, even in a flush toilet system where the water passage is sealed, the air in the air layer can be easily released, and the adverse effects of the air in the air layer can be effectively suppressed.

[0014] In the present invention, preferably, the vertical distance from the seat surface to the lower end of the condensation suppression portion when the drain valve is seated on the seat surface is 1 / 3 or more of the vertical distance from the seat surface to the water sealing surface of the water passage.

[0015] According to the present invention configured in this manner, since the distance from the seat surface to the lower end of the condensation suppression portion is 1 / 3 or more of the distance from the seat surface to the water sealing surface of the water passage, the merging of washing water that flows in from between the drain valve and the seat surface toward the center of the seat surface can be effectively suppressed, and the condensation of washing water can be sufficiently suppressed.

[0016] In the present invention, preferably, the horizontal cross-sectional area of ​​the condensation suppression portion is 1 / 2 or more of the inner area of ​​the sheet surface.

[0017] According to the present invention configured in this way, since the horizontal cross-sectional area of ​​the condensation suppression portion is 1 / 2 or more of the inner area of ​​the sheet surface, the washing water that flows below the condensation suppression portion is less likely to merge, and the condensation of the washing water can be sufficiently suppressed.

[0018] In the present invention, preferably, the washing water tank device further has a flow guide section which is a wall surface provided on the outside of the sheet surface so as to surround the sheet surface.

[0019] According to the present invention configured in this manner, the cleaning water tank device has a flow guide portion provided on the outside of the sheet surface so as to surround the sheet surface, which reduces the flow velocity of the cleaning water from between the drain valve and the sheet surface toward the center of the sheet surface, and further suppresses the merging of cleaning waters.

[0020] In the present invention, preferably, the water passage extending from the inlet of the toilet bowl body is sealed by the flushing water stored in the toilet bowl body, a drainage passage is formed between the seat surface and the drain outlet, with the flow path cross-sectional area narrowing downwards, and in the vertical plane, a straight line passing over the upper end of the flow guide and tangent to the inner wall surface of the drainage passage intersects below the water-sealing surface of the water passage of the toilet bowl body.

[0021] With the present invention configured in this way, the straight line passing over the upper end of the flow guide and in contact with the inner wall surface of the drainage passage intersects below the water seal surface of the water passage of the toilet body. As a result, the flushing water that falls through the drainage passage onto the water seal surface is less likely to merge above the water seal surface, and the air above the water seal surface can be easily released through the exhaust passage.

[0022] Furthermore, the present invention relates to a flush toilet device that performs cleaning with cleaning water stored in a cleaning water tank device, comprising: a flush toilet body having a bowl and an inlet for introducing cleaning water to clean the bowl; and a cleaning water tank device for storing cleaning water to clean the bowl, wherein the cleaning water tank device comprises: a cleaning water tank body for storing cleaning water; a drain outlet for discharging the cleaning water from the cleaning water tank body and introducing it into the inlet of the flush toilet body; an annular seat surface provided so as to surround the drain outlet; and a seat surface that allows for sitting and standing up. The toilet bowl has a drain valve that discharges and stops the flushing water from the flushing water tank body, and an overflow pipe that connects a lower end opening that opens into the space below the seat surface and an upper end opening that opens above the water level of the flushing water stored in the flushing water tank body. The water passage extending from the inlet of the flushing toilet body is sealed by the flushing water stored in the flushing toilet body, and the drain valve is configured to move away from the seat surface by rotating around a pivot shaft provided at one end, and the lower end opening of the overflow pipe is provided on the opposite side of the pivot shaft.

[0023] According to the present invention configured in this way, since the lower end opening of the overflow pipe is located on the opposite side of the support shaft of the drain valve, when the drain valve is opened, the flushing water that flows into the seat surface from the opposite side of the support shaft is less likely to flow into the lower end opening of the overflow pipe, and the air that was between the seat surface and the water seal can be easily discharged through the overflow pipe. As a result, the air in the air layer can be easily released, the adverse effects of the air in the air layer can be effectively suppressed, and the initial instantaneous flow rate of flushing water supplied to the toilet bowl body can be increased. [Effects of the Invention]

[0024] According to the flushing toilet device of the present invention, it is possible to suppress a decrease in the instantaneous flow rate of the flushing water supplied to the flushing toilet body immediately after opening the drain valve.

Brief Description of the Drawings

[0025] [Figure 1] It is a plan view showing a flushing toilet device according to the first embodiment of the present invention. [Figure 2] In the flushing toilet device according to the first embodiment of the present invention, it is a side cross-sectional view taken along line II-II of FIG. 1. [Figure 3] In the flushing toilet device according to the first embodiment of the present invention, it is a cross-sectional view showing an enlarged connection portion between the flushing toilet body and the flushing water tank body. [Figure 4] It is a cross-sectional view showing an enlarged drain port portion of the flushing water tank body provided in the flushing toilet device according to the first embodiment of the present invention. [Figure 5] It is a top view of the flushing water tank body provided in the flushing toilet device according to the first embodiment of the present invention. [Figure 6] In the flushing toilet device according to the first embodiment of the present invention, it is a cross-sectional view showing an enlarged drain valve seated on the seat surface. [Figure 7] In the flushing toilet device according to the first embodiment of the present invention, it is a cross-sectional view showing the flow of the flushing water in the flushing water tank body when the drain valve is opened. [Figure 8] It is a cross-sectional view showing the flow of the flushing water in the flushing water tank body in the flushing toilet device according to the comparative example. [Figure 9] It is a cross-sectional view schematically showing an enlarged portion of the flushing water tank device of the flushing toilet device according to the second embodiment of the present invention.

Modes for Carrying Out the Invention

[0026] Next, a flushing toilet device according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 is a plan view showing a flush toilet device according to a first embodiment of the present invention. Figure 2 is a side cross-sectional view taken along the line II-II in Figure 1.

[0027] As shown in Figures 1 and 2, the flush toilet device 1 according to the first embodiment of the present invention is a siphon jet type flush toilet and comprises a ceramic flush toilet body 2, a resin toilet seat and toilet lid (not shown) positioned on the upper surface of the flush toilet body 2, and a flush water tank device 4 positioned at the rear upper part of the flush toilet body 2 and covered by a resin cover (not shown).

[0028] The toilet bowl body 2 includes a bowl section 6 for receiving waste, a drain trap pipe 8 provided at the bottom of the bowl section 6 for discharging waste by siphon action, a rim spout 10 for rim water discharge, a rim water channel 12 for guiding flushing water to the rim spout, a jet spout 14 for jet water discharge, and a jet water channel 16 for guiding flushing water to the jet spout 14.

[0029] The bowl portion 6 comprises a bowl-shaped waste receiving surface 18, a rim portion 20 formed along the upper edge of the bowl portion 6, and a shelf portion 21 formed between the waste receiving surface 18 and the rim portion 20. The bowl portion 6 also includes a pot portion 22 formed in the area below the waste receiving surface 18 and connected to the drain trap pipe 8. A water seal surface W is formed inside this pot portion 22.

[0030] The drain trap pipe 8 comprises an inlet 8a, an upward pipe 8b extending upward from the inlet 8a, a downward pipe 8c extending downward from the upward pipe 8b, and a top 8d located between the downward pipe 8c and the upward pipe 8b, which defines the water seal level. Here, the lower end of the descending pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0031] The rim spout 10 is formed on the left rear side of the rim portion 20 when viewing the toilet bowl body 2 from the front. The rim spout 10 discharges flushing water forward, and this flushing water flows down to the waste receiving surface 18 while swirling on the inner circumferential surface of the rim portion 20 and the shelf surface of the shelf portion 21.

[0032] The rim water conduit 12 is formed in a tapered shape, with the cross-sectional area of ​​the flow path gradually decreasing towards the rim outlet 10. Cleaning water is supplied to the rim water conduit 12 from the water supply via the cleaning water tank device 4, and the cleaning water is discharged from the rim outlet 10 due to the water supply pressure from the water supply.

[0033] The jet outlet 14 is formed at the bottom of the bowl section 6. The jet outlet 14 is positioned opposite the inlet 8a of the drain trap pipe 8 and is directed toward the inlet 8a of the drain trap pipe 8. The jet outlet 14 discharges cleaning water toward the inlet 8a of the drain trap pipe 8, and this cleaning water flows into the drain trap pipe 8 to activate the siphon effect.

[0034] The jet water channel 16 comprises an upstream channel 16a extending forward from the flushing water tank device 4, a bent channel 16b that bends from the upstream channel, and a downstream channel 16c that extends backward from the bent channel and connects to the jet outlet 14. Flushing water is supplied to the jet water channel 16 from the flushing water tank body 26 of the flushing water tank device 4, and the flushing water is discharged from the jet outlet 14 by the head pressure of the flushing water. Thus, in this embodiment, the flushing water discharged from the rim outlet 10 is supplied directly from the water supply, and the flushing water discharged from the jet outlet 14 is supplied from the flushing water tank body 26 (Figure 1). However, as a modification, the present invention can also be applied to a flush toilet device in which the entire amount of flushing water to be discharged is supplied from a flushing water tank.

[0035] Next, with further reference to Figures 3 to 6, the configuration of the washing water tank device 4 of the first embodiment of the present invention will be described. Figure 3 is an enlarged cross-sectional view showing the connection between the toilet bowl body 2 and the flushing water tank body 26 in the flushing toilet device 1 of this embodiment. Figure 4 is an enlarged cross-sectional view showing the drain port portion of the flushing water tank body 26 provided in the flushing water tank device 4. Figure 5 is a top view of the flushing water tank body 26 provided in the flushing water tank device 4. Figure 6 is an enlarged cross-sectional view showing the drain valve seated on the seat surface.

[0036] As shown in Figures 1 and 2, the cleaning water tank device 4 includes a valve unit 24 for supplying and stopping cleaning water from the water supply, a resin cleaning water tank body 26 for storing the cleaning water supplied via the valve unit 24, and a drain valve 28 for discharging and stopping the cleaning water from the cleaning water tank body 26.

[0037] The valve unit 24 includes a solenoid valve 24a for tank water supply, a solenoid valve 24b for rim water discharge, etc., and is configured to control the supply and cessation of tap water supplied from the water supply to the washing water tank body 26, and the discharge and cessation of tap water from the rim water outlet 10.

[0038] As shown in Figure 3, the flushing water tank body 26 is configured to store flushing water for flushing the toilet body and is fixed to the toilet body 2 via a base plate 30. A drain valve 28 and a drain valve drive mechanism 32 are also located inside the flushing water tank body 26. The drain valve drive mechanism 32 lifts the drain valve 28, which opens and flushing water is discharged from the flushing water tank body 26. The flushing water discharged from the flushing water tank body 26 flows through an inlet 2a provided on the rear upper surface of the toilet body 2 and into a jet water channel 16 provided inside the toilet body 2. In other words, in this embodiment, the jet water channel 16 constitutes a water channel extending from the inlet 2a of the toilet body 2.

[0039] In this embodiment, the flushing water tank body 26 is a small resin tank with a volume of approximately 2 liters. As shown in Figure 2, the lower part of the flushing water tank body 26 is positioned below the upper surface of the rim portion 20 of the flush toilet body 2, and above the top portion 8d of the drain trap pipe 8. As a result, the flush toilet device 1 is a low-profile toilet. In this embodiment, the flushing water in the flushing water tank body 26 is discharged from the jet outlet 14 by gravity.

[0040] As shown in Figure 3, the bottom surface of the cleaning water tank body 26 is provided with an annular projection 26a that protrudes downward, and the inside of this annular projection 26a constitutes a drainage passage 26b that extends downward from the bottom surface of the cleaning water tank body 26. Furthermore, a groove 26c is formed on the outer circumferential surface of the projection 26a, and an annular O-ring 34 is fitted into this groove 26c. On the other hand, the base plate 30 that supports the cleaning water tank body 26 is provided with a circular drainage opening 30a. The circular opening at the lower end of the drainage passage 26b is formed to be approximately the same diameter as the drainage opening 30a provided in the base plate 30, and the drainage passage 26b and the drainage opening 30a are smoothly connected. In this embodiment, the lower end of the drainage opening 30a functions as the drain port 30e of the cleaning water tank device 4. Note that the drain port may be integrally formed with the cleaning water tank body.

[0041] Furthermore, the bottom surface of the base plate 30 is provided with a cylindrical portion 30b that protrudes downward, surrounding the drainage opening 30a. Additionally, an annular upper recess 30c is formed on the upper surface of the bottom surface of the base plate 30, surrounding the drainage opening 30a. On the other hand, an annular lower recess 30d is formed on the lower surface of the bottom surface of the base plate 30, surrounding the cylindrical portion 30b.

[0042] Furthermore, the protrusion 26a that extends from the bottom surface of the cleaning water tank body 26 is received in the upper surface recess 30c formed on the upper surface of the base plate 30. By fitting the protrusion 26a of the cleaning water tank body 26 into the upper surface recess 30c of the base plate 30 in this way, the O-ring 34 positioned on the outer circumference of the protrusion 26a is compressed radially in the drainage passage 26b, thereby sealing the space between the cleaning water tank body 26 and the base plate 30.

[0043] Meanwhile, a packing 36 is positioned in an annular lower recess 30d formed on the lower surface of the base plate 30. The packing 36 is configured as an annular shape and is fitted around a cylindrical portion 30b formed on the inner circumference of the lower recess 30d, and is received inside the lower recess 30d. The base plate 30 is fixed to the rear upper surface of the toilet body 2 by a plurality of bolts 38 (only one is shown in Figure 3).

[0044] As a result, the packing 36, which is positioned in the lower recess 30d on the lower surface of the base plate 30, is compressed between the base plate 30 and the toilet bowl body 2. That is, when the flushing water tank body 26 is fixed to the toilet bowl body 2 via the base plate 30, the packing 36 is sandwiched and crushed between the lower recess 30d on the lower surface of the base plate 30 and the periphery of the inlet 2a on the upper surface of the toilet bowl body 2. This ensures watertightness between the base plate 30 and the toilet bowl body 2.

[0045] Next, as shown in Figure 4, the drain passage 26b is a passage formed to extend downward from the bottom surface of the cleaning water tank body 26, has a circular cross-section, and is configured so that the cross-sectional area of ​​the flow path narrows towards the bottom. In addition, the inner wall surface of the drain passage 26b is curved upward in a convex shape in the vertical cross-section shown in Figure 4. Furthermore, an annular seat surface 26d (Figure 5) is provided at the entrance of the upper end of the drain passage 26b, surrounding it. The seat surface 26d is a narrow annular surface, and the drain valve 28 sits on and off this seat surface 26d, thereby opening and closing the drain port of the cleaning water tank body 26, and the cleaning water is discharged and stopped.

[0046] Specifically, when flushing the bowl portion 6 of the toilet bowl body 2, the drain valve 28 is lifted by the drain valve drive mechanism 32 (Figure 3) from the closed valve position P1, shown by the dashed line in Figure 4, to the open valve position P2, shown by the dashed line. When the drain valve 28 is in the closed valve position P1 and seated on the seat surface 26d, the discharge of flushing water from the flushing water tank body 26 is stopped. Then, when the drain valve 28 is moved to the open valve position P2 and lifted from the seat surface 26d, flushing water is discharged from the flushing water tank body 26.

[0047] Furthermore, as shown in Figures 4 and 5, a flow guide section 40 is provided at the bottom of the washing water tank body 26 so as to surround the periphery of the sheet surface 26d. This flow guide section 40 is a surrounding wall surface that rises vertically outside the sheet surface 26d so as to surround the sheet surface 26d, and is formed concentrically with the circular sheet surface 26d. By providing the flow guide section 40 in this way, the flow velocity of the washing water towards the center C of the drainage passage 26b is reduced within the washing water tank body 26.

[0048] Furthermore, as shown in Figure 4, the surrounding wall surface constituting the flow guide section 40 is configured such that its upper end is located above the tangent line L1 that contacts the inner wall surface of the drainage passage 26b at the entrance of the upper end of the drainage passage 26b. By configuring the flow guide section 40 in this way, the cleaning water flowing towards the center C of the drainage passage 26b near the bottom surface of the cleaning water tank body 26 hits the flow guide section 40 and is directed upward, thereby reducing the velocity component of the cleaning water heading towards the center C of the drainage passage 26b.

[0049] Furthermore, in this embodiment, the surrounding wall surface constituting the flow guide section 40 is notched at four locations on the circumference. That is, as shown in Figure 5, the flow guide section 40 has four notches 40a provided at equal intervals on the circumference, and the height of the surrounding wall surface is reduced in those areas. In this way, in the areas where the notches 40a are provided, the velocity component of the washing water heading from around the drain outlet toward the center C of the drain passage 26b is hardly reduced. For this reason, the magnitude of the average velocity component heading toward the center C of the drain passage 26b can be adjusted by changing the number and size of the notches 40a provided in the flow guide section 40.

[0050] Furthermore, as shown by the dashed line in Figure 4, when the drain valve 28 is raised to its highest height, the open valve position P2, the vertical distance D1 from the upper end of the flow guide section 40, which is the surrounding wall surface, to the lower surface of the drain valve 28 is more than half of the vertical distance D2 from the seat surface 26d to the lower surface of the drain valve 28. By setting the distance from the upper end of the flow guide section 40 to the drain valve 28 in this way, it is possible to provide the flow guide section 40 around the seat surface 26d while ensuring a sufficient flow path cross-sectional area between the flow guide section 40 and the drain valve 28.

[0051] Next, the detailed structure of the drain valve 28 will be described with reference to Figure 6. First, as shown in Figure 6, in the standby state of the flush toilet device 1, the inside of the jet water channel 16, which is a water passage extending from the inlet 2a, is filled with flushing water up to the water level of the water seal surface W, and the jet water channel 16 is sealed by the flushing water. The height of this water seal surface W is determined by the height of the top 8d (Figure 2) of the drain trap pipe 8, and is the same as the water level of the retained water stored in the bowl 6. As a result, when the drain valve 28 is seated on the seat surface 26d and the flush toilet device 1 is in the standby state, the space between the seat surface 26d and the water seal surface W of the jet water channel 16 is an air layer A.

[0052] Furthermore, as shown in Figure 6, the drain valve 28 has a disc portion 28a that sits on the seat surface 26d, an exhaust passage 28b extending vertically upward from the upper surface of the disc portion 28a, a condensation suppression portion 28c extending downward from the lower surface of the disc portion 28a, and a ball chain 28d extending vertically upward from the center of the disc portion 28a through the exhaust passage 28b. The disc portion 28a is a flat plate formed in the shape of a donut, with an outer diameter larger than that of the seat surface 26d. By seating on the seat surface 26d, the discharge of cleaning water from the cleaning water tank body 26 is stopped.

[0053] The exhaust passage 28b is a cylindrical pipe that extends vertically upward in a concentric circle with the disc portion 28a from the upper surface of the disc portion 28a, and its upper end extends above the water level of the flushing water stored in the flushing water tank body 26 when the flush toilet device 1 is in standby mode (Figure 3). Therefore, when the drain valve 28 is seated on the seat surface 26d, the air layer A below the seat surface 26d and the space above the water level of the flushing water stored in the flushing water tank body 26 are connected by the exhaust passage 28b. In other words, since the jet water channel 16 is sealed by the water seal surface W, the space between the seat surface 26d and the water seal surface W of the jet water channel 16 is in communication with the outside air only through the exhaust passage 28b.

[0054] The condensation suppression portion 28c is a cylindrical projection that extends downward from the lower surface of the disc portion 28a in a concentric manner with the disc portion 28a, and its lower end is open. This condensation suppression portion 28c extends so as to protrude below the seat surface 26d when the drain valve 28 is seated on the seat surface 26d. The air layer A below the seat surface 26d is connected to the space above the water surface of the cleaning water in the cleaning water tank body 26 through the condensation suppression portion 28c, the disc portion 28a, and the exhaust passage 28b. As will be described later, by providing the condensation suppression portion 28c on the drain valve 28, condensation of the flow of cleaning water from the periphery of the seat surface 26d toward the center is suppressed when the cleaning water in the cleaning water tank body 26 is discharged.

[0055] Furthermore, the lower end of the ball chain 28d is connected to the disc portion 28a of the drain valve 28, extends through the inside of the exhaust passage 28b, and its upper end is connected to the drain valve drive mechanism 32 (Figure 3). As a result, when the toilet is flushed, the ball chain 28d is pulled upward by the drain valve drive mechanism 32, which lifts the drain valve 28 and separates the disc portion 28a from the seat surface 26d.

[0056] Furthermore, as shown in Figure 6, when the drain valve 28 is seated on the seat surface 26d, the vertical distance H1 from the seat surface 26d to the lower end of the condensation suppression portion 28c is set to be at least 1 / 3 of the vertical distance H2 from the seat surface 26d to the water sealing surface W of the jet water conduit 16. Also, the horizontal cross-sectional area of ​​the outer circumference of the condensation suppression portion 28c is set to be at least 1 / 2 of the area inside the seat surface 26d. In this way, by occupying the space between the seat surface 26d and the water sealing surface W of the jet water conduit 16 with the condensation suppression portion 28c, it is possible to suppress the condensation of the cleaning water when the cleaning water in the cleaning water tank body 26 begins to flow into the inside of the seat surface 26d.

[0057] Furthermore, as shown in Figure 6, in the vertical plane, the straight line L2 that passes over the upper end of the flow guide section 40 and is in contact with the inner wall surface of the drainage passage 26b intersects below the water seal surface W of the jet water channel 16 of the flush toilet body 2. By configuring the flow guide section 40 and the drainage passage 26b in this way, it is possible to suppress the merging of flush water that flows in from around the seat surface 26d along the inner wall surface of the drainage passage 26b after overflowing the upper end of the flow guide section 40, before it falls to the water seal surface W. This prevents the flush water flowing in from around the seat surface 26d from entraining the air in the air layer A below the seat surface 26d and disrupting the flow of flush water.

[0058] Next, with further reference to Figures 7 and 8, the operation of the flush toilet device 1 according to the first embodiment of the present invention will be explained. Figure 7 is a cross-sectional view showing the flow of flushing water in the flushing water tank body 26 when the drain valve 28 is open. Figure 8 is a cross-sectional view showing the flow of flushing water in the flushing water tank body of a flush toilet device according to a comparative example.

[0059] First, when the user performs a flushing operation on the toilet flushing device 1, a controller (not shown) provided in the toilet flushing device 1 sends a control signal to the rim water discharge solenoid valve 24b (Figure 1) of the valve unit 24, causing it to open. As a result, the cleaning water supplied from the water supply passes through the rim water discharge solenoid valve 24b and the rim water conduit 12 and is discharged from the rim water outlet 10. The cleaning water discharged from the rim water outlet 10 forms a swirling flow on the waste receiving surface 18 of the bowl section 6 and cleans the waste receiving surface 18.

[0060] After the rim water discharge solenoid valve 24b is opened and a predetermined time has elapsed, the controller (not shown) sends a control signal to the drain valve drive mechanism 32 (Figure 3), which activates the motor (not shown) provided in the drain valve drive mechanism 32, lifting the drain valve 28 from the seat surface 26d of the flush water tank body 26. As a result, the disc portion 28a of the drain valve 28 is pulled away from the seat surface 26d, and the flush water stored in the flush water tank body 26 flows through the drain passage 26b of the flush water tank body 26 to the inlet 2a (Figure 3) of the flush toilet body 2, and is discharged from the jet outlet 14 through the jet water conduit 16. The discharge from the jet outlet 14 induces a siphon effect in the drain trap pipe 8, and the flush water and waste in the bowl portion 6 are discharged through the drain trap pipe 8.

[0061] Here, when the disc portion 28a of the drain valve 28 is lifted from the seat surface 26d of the cleaning water tank body 26, the cleaning water inside the cleaning water tank body 26 immediately begins to flow toward the center C of the drain passage 26b (drain port). That is, at the moment the drain valve 28 is lifted, the cleaning water inside the cleaning water tank body 26 flows from the gap between the lower surface of the disc portion 28a and the seat surface 26d toward the center C of the drain passage 26b, and then falls downward within the drain passage 26b.

[0062] In this case, a condensation suppression part 28c is provided on the lower surface of the disc part 28a so as to protrude downward, the flushing water flowing from around the seat surface 26d toward the center C of the drain port 30e hits the outer surface of the condensation suppression part 28c and falls downward. As a result, most of the flushing water that flows into the inside of the seat surface 26d flows smoothly along the inner wall surface of the drain passage 26b into the inlet 2a of the toilet body 2.

[0063] On the other hand, when cleaning water flows into this space, the air in the space between the sheet surface 26d and the water sealing surface W of the jet water channel 16 (air layer A) is pushed out and flows into the exhaust passage 28b, and then flows out into the space above the water surface of the cleaning water tank body 26. At this time, since the cleaning water flows along the inner wall surface of the drainage passage 26b, it is less likely to mix with the air in air layer A, and it quickly flows into the exhaust passage 28b and is discharged into the atmosphere.

[0064] In other words, the "condensation" of the cleaning water flowing from the periphery of the seat surface 26d toward the center C of the drain port 30e is suppressed, and the air in air layer A is quickly discharged through the exhaust passage 28b located in the center of the seat surface 26d. This prevents the air in air layer A from being drawn into the cleaning water, which would hinder the rapid flow of the cleaning water. As a result, the instantaneous flow rate of cleaning water discharged from the cleaning water tank body 26 immediately after the drain valve 28 is opened can be increased.

[0065] In contrast, as shown in the comparative example in Figure 8, if the drain valve 228 is not provided with a condensation suppression section and there is no flow guide section around the seat surface 226d, when the drain valve 228 moves away from the seat surface 226d, the cleaning water in the cleaning water tank body 226 flows rapidly towards the center C of the drain outlet. That is, as shown in Figure 8, the cleaning water flows from around the seat surface 226d towards the center C, colliding and merging with each other near the center of the drain outlet. The cleaning water that merges near the center of the drain outlet falls through the drain passage 226b, and a region where cleaning water does not flow temporarily occurs at the periphery of the drain passage 226b. In other words, in a conventional drain valve 228 that is not provided with a condensation suppression section, condensation of the cleaning water flow occurs immediately after the valve is opened, and the effective flow path cross-sectional area becomes narrower. As a result, the instantaneous flow rate of cleaning water immediately after the drain valve 228 is opened decreases.

[0066] In addition, when the cleaning water flowing from the periphery of the seat surface 226d toward the center C collides with each other near the center of the drain outlet, air present in the drain passage 226b is drawn into the cleaning water, and large bubbles may form in the cleaning water. Even if the drain valve 228 is provided with an exhaust passage, the air in these bubbles is difficult to expel and tends to remain inside the drain passage 226b. This stagnant air narrows the effective flow path cross-sectional area within the drain passage 226b, causing a decrease in the instantaneous flow rate of cleaning water immediately after the drain valve 228 is opened.

[0067] Such a decrease in instantaneous flow rate due to stagnant air is likely to occur in flush toilets where the water passage extending from the inlet of the flush toilet body is sealed with flushing water, as in the flush toilet device 1 of this embodiment. In other words, in flush toilets where the water passage is sealed with flushing water, there are few paths for the air that has been stagnating in the water passage to escape, and stagnation is likely to occur as the air is drawn into the flushing water. In the flush toilet device 1 of this embodiment, by providing a condensation suppression part 28c in the drain valve 28, the condensation of the flushing water is suppressed, and the air that has been stagnating in the water passage can be quickly discharged from the exhaust passage 28b, thereby suppressing the adverse effects of stagnant air.

[0068] Furthermore, in the flush toilet device 1 of this embodiment, a flow guide section 40 is provided around the annular seat surface 26d, surrounding it. As a result, as shown in Figure 4, the flow from around the seat surface 26d toward the center C of the drainage passage 26b is directed upward, overcoming the flow guide section 40, as indicated by arrow F1, before flowing downward into the drainage passage 26b. The flow F1 of flush water that flows over the flow guide section 40 into the drainage passage 26b falls along the inner wall surface of the drainage passage 26b. This suppresses the condensation of flush water at the moment the drain valve 28 is lifted from the seat surface 26d, and the flush water in the flush water tank body 26 can flow smoothly into the drainage passage 26b. As a result, the instantaneous flow rate of flush water flowing from the flush water tank body 26 into the jet water channel 16 increases.

[0069] In other words, in the flush toilet device 1 of this embodiment, when the drain valve 28 is opened, the flow of flushing water toward the center C of the drain passage 26b is temporarily directed upward by the flow guide unit 40, so that the horizontal component of the flushing water flow is appropriately reduced. As a result, the flow of flushing water flowing into the drain passage 26b does not separate from the inner wall surface of the drain passage 26b, and the flushing water can flow smoothly along the inner wall surface of the drain passage 26b, thereby increasing the instantaneous flow rate.

[0070] As described above, the drain valve 28 is lifted from the seat surface 26d, and flushing water is discharged from the jet outlet 14. After a predetermined time, the controller (not shown) sends a control signal to the rim water discharge solenoid valve 24b to close it. This stops the discharge of water from the rim outlet 10, and one toilet flush is completed.

[0071] In the flush toilet device 1 of the first embodiment of the present invention, a condensation suppression part 28c is provided in the drain valve 28 to suppress the condensation of the flow of flushing water from the periphery of the seat surface 26d toward the center C. As a result, the entrainment of air that was downstream of the seat surface 26d by the flushing water flowing in from the periphery of the seat surface 26d is suppressed. As a result, the air that was downstream of the seat surface is quickly discharged through the exhaust passage 28b, obstruction of the flow of flushing water by air is suppressed, and the initial instantaneous flow rate of flushing water supplied to the flush toilet body 2 can be increased.

[0072] Furthermore, according to the flush toilet device 1 of this embodiment, the exhaust passage 28b provided in the drain valve 28 connects the lower end of the condensation suppression section 28c with the space above the water surface of the flush water stored in the flush water tank body 26. This allows air downstream of the seat surface 26d to escape quickly to the area above the water surface of the flush water, and the influence of air downstream of the seat surface 26d can be greatly reduced. As a result, the initial instantaneous flow rate of flush water supplied to the flush toilet body 2 can be increased.

[0073] Furthermore, according to the flush toilet device 1 of this embodiment, the condensation suppression part 28c is provided at the lower end of the drain valve 28 and is composed of a protrusion that extends below the seat surface 26d. This prevents the flush water that flows in from between the drain valve 28 and the seat surface 26d toward the center of the seat surface 26d from merging directly. As a result, condensation of the flush water flow is suppressed and the instantaneous flow rate of the flush water can be increased.

[0074] Furthermore, according to the flush toilet device 1 of this embodiment, the condensation suppression unit 28c suppresses the condensation of the flushing water flow, and since an exhaust passage 28b is provided, even in the flush toilet device 1 in which the jet water channel 16, which is a water passage, is sealed with water, the air in the air layer A can be easily released, and the adverse effects of the air in the air layer A can be effectively suppressed.

[0075] Furthermore, according to the flush toilet device 1 of this embodiment, the distance from the seat surface 26d to the lower end of the condensation suppression part 28c is 1 / 3 or more of the distance from the seat surface 26d to the water seal surface W of the water passage, so the merging of flush water that flows in from between the drain valve 28 and the seat surface 26d toward the center C of the seat surface 26d can be effectively suppressed, and the condensation of the flush water can be sufficiently suppressed.

[0076] Furthermore, according to the flush toilet device 1 of this embodiment, since the horizontal cross-sectional area of ​​the condensation suppression section 28c is 1 / 2 or more of the inner area of ​​the seat surface 26d, the flush water that flows below the condensation suppression section 28c is less likely to merge, and the condensation of the flush water can be sufficiently suppressed.

[0077] Furthermore, according to the flush toilet device 1 of this embodiment, since there is a flow guide section 40 provided on the outside of the seat surface 26d so as to surround the seat surface 26d, the flow velocity of the flushing water from between the drain valve 28 and the seat surface 26d toward the center C of the seat surface 26d is reduced, and the merging of flushing water can be further suppressed.

[0078] Furthermore, according to the flush toilet device 1 of this embodiment, the straight line passing over the upper end of the flow guide section 40 and in contact with the inner wall surface of the drainage passage 26b intersects below the water seal surface W of the jet water passage 16, which is the water passage of the flush toilet body 2. As a result, the flushing water that falls onto the water seal surface W through the drainage passage 26b is less likely to merge above the water seal surface W, and the air above the water seal surface W can be easily released through the exhaust passage 28b.

[0079] Next, with reference to Figure 9, a flush toilet device according to a second embodiment of the present invention will be described. Figure 9 is a schematic, enlarged cross-sectional view showing a portion of the flushing water tank device of a flush toilet device according to a second embodiment of the present invention.

[0080] As shown in Figure 9, the flush toilet device 100 according to the second embodiment of the present invention comprises a flush toilet body 102 and a flush water tank device 104. The flushing water tank device 104 includes a flushing water tank body 126, a drain valve 128, and a drain valve drive mechanism 132. When the toilet is flushed, the drain valve 128 is opened, and the flushing water in the flushing water tank body 126 is discharged, and the flushing water flows into the water passage 102b from the inlet 102a of the flush toilet body 102.

[0081] A drainage passage 126b extending vertically downward is provided at the bottom of the flushing water tank body 126. When the drain valve 128 is opened, the flushing water in the flushing water tank body 126 is discharged through the drainage passage 126b. In other words, the inside of the drainage passage 126b functions as a drain outlet that discharges the flushing water from the flushing water tank body 126 and allows it to flow into the inlet 102a of the flush toilet body 102. Furthermore, a seat surface 126d is provided around the upper end of the drainage passage 126b. The drain valve 128 is closed when it sits on this seat surface 126d, stopping the discharge of flushing water.

[0082] On the other hand, an overflow pipe 130 is connected to the drainage passage 126b. The lower end opening 130a of this overflow pipe 130 is provided on the inner wall surface of the drainage passage 126b, and the upper end opening 130b is located above the water level of the cleaning water in the cleaning water tank body 126. That is, the overflow pipe 130 extends horizontally from the lower end opening 130a provided on the inner wall surface of the drainage passage 126b oriented vertically, then bends vertically and extends to the upper end opening 130b. This overflow pipe 130 connects the atmosphere above the water level in the cleaning water tank body 126 with the air layer A below the seat surface 126d.

[0083] The drain valve 128 is a float valve having a hemispherical float portion 128a and an arm portion 128b extending from the float portion 128a. The tip of the arm portion 128b is rotatably supported by a support shaft 128c oriented horizontally. In this embodiment, as shown in Figure 9, the support shaft 128c is provided on the opposite side of the lower end opening 130a provided in the drain passage 126b. A ball chain 128d is attached to the upper surface of the float portion 128a, and the upper end of the ball chain 128d is connected to the drain valve drive mechanism 132.

[0084] The drain valve drive mechanism 132 is located at the top of the flushing water tank device 104 and is configured to pull the ball chain 128d upward when the toilet is flushed. When the float portion 128a is seated on the seat surface 126d, pulling the ball chain 128d upward causes the float portion 128a to rotate around the pivot shaft 128c, and the float portion 128a separates from the seat surface 126d. As a result, the drain valve 128 opens, and the flushing water from the flushing water tank body 126 flows through the drain passage 126b into the inlet 102a of the flush toilet body 102. In this embodiment, the drain valve drive mechanism 132 is configured with a manual lever (not shown), but the drain valve drive mechanism 132 can also be configured with a motor (not shown) or the like.

[0085] Next, the operation of the flush toilet device 100 according to the second embodiment of the present invention will be described. First, in the flush toilet device 100 of this embodiment, the water passage 102b extending from the inlet 102a of the flush toilet body 102 is sealed by the flushing water stored inside the flush toilet body 102. That is, in the standby state of the flush toilet device 100, an air layer A is formed in the space between the water sealing surface W of the water seal in the water passage 102b and the seat surface 126d of the flushing water tank body 126, and the space is filled with air.

[0086] Next, when the user performs the cleaning operation, the ball chain 128d is pulled upward, causing the float portion 128a of the drain valve 128 to rotate around the pivot shaft 128c. As a result, the float portion 128a separates from the seat surface 126d, and the discharge of cleaning water from the cleaning water tank body 126 begins. At this point, when the float portion 128a rotates around the pivot shaft 128c, the float portion 128a separates significantly from the seat surface 126d on the opposite side of the pivot shaft 128c (the left side in Figure 9). Therefore, especially immediately after the start of cleaning water discharge, the cleaning water flows mainly into the drain passage 126b from the gap between the float portion 128a and the seat surface 126d, on the opposite side of the pivot shaft 128c.

[0087] As a result, the cleaning water in the cleaning water tank body 126 flows into the inside of the seat surface 126d from the opposite side of the support shaft 128c toward the support shaft 128c, as shown by arrow F in Figure 9. Consequently, the main stream of cleaning water flowing into the inside of the seat surface 126d flows into the drainage passage 126b, skipping over the lower end opening 130a of the overflow pipe 130 which opens on the opposite side of the support shaft 128c. Therefore, the air in the air layer A below the seat surface 126d is not drawn into the incoming cleaning water, but quickly flows into the lower end opening 130a of the overflow pipe 130 and is discharged into the atmosphere from the upper end opening 130b.

[0088] In other words, immediately after the start of the discharge of the cleaning water, the cleaning water flows over the lower end opening 130a provided on the opposite side of the support shaft 128c, so that the lower end opening 130a is not blocked by the cleaning water. As a result, the air in the air layer A can be quickly discharged through the overflow pipe 130. Therefore, in this embodiment, the overflow pipe 130 functions as an exhaust passage. In this way, the air in the air layer A can be quickly discharged, so that the flow of the cleaning water is not obstructed by stagnant air, and the instantaneous flow rate immediately after the start of the discharge of the cleaning water can be increased.

[0089] According to the flush toilet device 100 of the second embodiment of the present invention, the lower end opening 130a of the overflow pipe 130 is provided on the opposite side of the pivot shaft 128c of the drain valve 128. Therefore, when the drain valve 128 is opened, the flushing water that flows into the seat surface 126d from the opposite side of the pivot shaft 128c is less likely to flow into the lower end opening 130a of the overflow pipe 130, and the air in the air layer A between the seat surface 126d and the water seal can be easily discharged through the overflow pipe 130. As a result, the air in the air layer A can be easily released, the adverse effects of the air in the air layer A can be effectively suppressed, and the initial instantaneous flow rate of flushing water supplied to the flush toilet body 102 can be increased.

[0090] Although embodiments of the present invention have been described above, various modifications can be made to the embodiments described above. Furthermore, the present invention can also be configured as follows in a preferred configuration. 1. A flush toilet system that performs flushing using flushing water stored in a flushing water tank, A flush toilet body having a bowl section and an inlet for introducing flushing water to clean the bowl section, It has a cleaning water tank device for storing cleaning water for cleaning the bowl portion mentioned above, The above-mentioned washing water tank device is A washing water tank body for storing washing water, A drain outlet that discharges the flushing water from the flushing water tank body and flows it into the inlet of the flush toilet body, This drain opening is surrounded by an annular sheet surface, A drain valve that, when a person sits on or leaves this seat surface, causes the cleaning water to be discharged from the cleaning water tank body and stops, With the drain valve seated on the seat surface, an exhaust passage connects the space below the seat surface with the space above the water level of the cleaning water stored in the cleaning water tank body, To suppress the condensation of the flow of cleaning water from the periphery to the center of the seat surface when the cleaning water is discharged from the cleaning water tank body, the drain valve is provided with a condensation suppression part, A flush toilet device characterized by having the following features. 2. The flush toilet device according to claim 1, wherein the drain valve is configured to be pulled upward from the seat surface, the exhaust passage is provided in the drain valve, and the lower end of the condensation suppression part is configured to communicate with the space above the water level of the flush water stored in the flush water tank body. 3. The flush toilet device according to item 2, wherein the condensation suppression part is provided at the lower end of the drain valve and is a protruding part that extends below the seat surface when the drain valve is seated on the seat surface. 4. The flush toilet device according to item 2, wherein the water passage extending from the inlet of the flush toilet body is sealed by the flushing water stored inside the flush toilet body, and an air layer is formed between the seat surface and the water-sealing surface of the water passage. 5. The flush toilet device according to item 4, wherein the vertical distance from the seat surface to the lower end of the condensation suppression portion when the drain valve is seated on the seat surface is 1 / 3 or more of the vertical distance from the seat surface to the water seal surface of the water passage. 6. The flush toilet device according to item 2, wherein the horizontal cross-sectional area of ​​the condensation suppression portion is 1 / 2 or more of the inner area of ​​the sheet surface. 7. The flush toilet device according to claim 1, further comprising a flush water tank device, a flow guide portion which is a wall surface provided on the outside of the seat surface so as to surround the seat surface. 8. The flush toilet device according to item 7, wherein the water passage extending from the inlet of the flush toilet body is sealed by the flushing water stored in the flush toilet body, a drainage passage is formed between the seat surface and the drain outlet, the cross-sectional area of ​​the flow path narrows downwards, and in a vertical plane, a straight line passing over the upper end of the flow guide and tangent to the inner wall surface of the drainage passage intersects below the water-sealing surface of the water passage of the flush toilet body. 9. A flush toilet system that performs flushing using flushing water stored in a flushing water tank, A flush toilet body having a bowl section and an inlet for introducing flushing water to clean the bowl section, It has a cleaning water tank device for storing cleaning water for cleaning the bowl portion mentioned above, The above-mentioned washing water tank device is A washing water tank body for storing washing water, A drain outlet that discharges the flushing water from the flushing water tank body and flows it into the inlet of the flush toilet body, This drain opening is surrounded by an annular sheet surface, A drain valve that, when a person sits on or leaves this seat surface, causes the cleaning water to be discharged from the cleaning water tank body and stops, An overflow pipe connects a lower end opening that opens into the space below the seat surface and an upper end opening that opens above the water level of the cleaning water stored in the cleaning water tank body. It has, The water passage extending from the inlet of the above-mentioned flush toilet body is sealed by the flushing water stored inside the above-mentioned flush toilet body. The above-mentioned drain valve is configured to rotate around a pivot shaft provided at one end, thereby separating it from the seat surface, and the lower end opening of the overflow pipe is provided on the opposite side of the pivot shaft, characterized in that the flush toilet device. [Explanation of symbols]

[0091] 1 Flush toilet device 2 Flush toilet body 2a Inlet 4. Washing water tank device 6 Bowl section 8. Drain trap pipe 8a Entrance 8b Ascent conduit 8c descending pipe 8d top 10 Rim spout 12 Rim water conduit 14 Jet nozzle 16. Jet water conduit 16a Upstream channel 16b Bent channel 16c Downstream channel 18 Waste receiving surface 20 Rim section 21 Shelf 22 Acupressure points 24 Valve Unit 24a Solenoid valve for tank water supply 24b Solenoid valve for rim discharge 26 Washing water tank body 26a Protrusion 26b Drain passage 26c groove 26d Seat surface 28 Drain valve 28a Disc section 28b Exhaust passage 28c Condensation suppressing part (projecting part) 28d Jade Chain 30 base plate 30a drainage opening 30b Cylindrical section 30c Top recess 30d Bottom recess 30e drain 32 Drain valve drive mechanism 34 O-rings 36 Packing 38 volts 40 Flow guidance section 40a Notch 100 Flush toilet device 102 Flush toilet body 102a Inlet 102b Canal 104 Washing water tank device 126 Washing water tank body 126b Drain passage 126d Seat surface 128 Drain valve 128a Float section 128b Arm section 128c spindle 128d ball chain 130 Overflow pipe 130a Bottom opening 130b Top opening 132 Drain valve drive mechanism 226 Washing water tank body 226b Drain passage 226d Seat surface 228 Drain valve

Claims

1. A flush toilet system that performs flushing using flushing water stored in a flushing water tank, A flush toilet body having a bowl section and an inlet for introducing flushing water to clean the bowl section, It has a cleaning water tank device for storing cleaning water for cleaning the bowl portion mentioned above, The above-mentioned washing water tank device is A washing water tank body for storing washing water, A drain outlet that discharges the flushing water from the flushing water tank body and flows it into the inlet of the flush toilet body, This drain opening is surrounded by an annular sheet surface, A drain valve that, when a person sits on or leaves this seat surface, causes the cleaning water to be discharged from the cleaning water tank body and stops, With the drain valve seated on the seat surface, an exhaust passage connects the space below the seat surface with the space above the water level of the cleaning water stored in the cleaning water tank body, To suppress the condensation of the flow of cleaning water from the periphery to the center of the seat surface when the cleaning water is discharged from the cleaning water tank body, the drain valve is provided with a condensation suppression part, It has, The condensation suppression portion is provided at the lower end of the drain valve and is a projection that extends downward from the seat surface when the drain valve is seated on the seat surface. The water passage extending from the inlet of the above-mentioned flush toilet body is sealed by the flushing water stored inside the above-mentioned flush toilet body, and an air layer is formed between the seat surface and the water-sealing surface of the water passage. A flush toilet device characterized in that, when the drain valve is seated on the seat surface, the vertical distance from the seat surface to the lower end of the condensation suppression part is 1 / 3 or more of the vertical distance from the seat surface to the water seal surface of the water passage.

2. A flush toilet device that performs cleaning using cleaning water stored in a cleaning water tank device, A flush toilet body having a bowl section and an inlet for introducing flushing water to clean the bowl section, It has a cleaning water tank device for storing cleaning water for cleaning the bowl portion mentioned above, The above-mentioned washing water tank device is A washing water tank body for storing washing water, A drain outlet that discharges the flushing water from the flushing water tank body and flows it into the inlet of the flush toilet body, This drain opening is surrounded by an annular sheet surface, A drain valve that, when a person sits on or leaves this seat surface, causes the cleaning water to be discharged from the cleaning water tank body and stops, With the drain valve seated on the seat surface, an exhaust passage connects the space below the seat surface with the space above the water level of the cleaning water stored in the cleaning water tank body, To suppress the condensation of the flow of cleaning water from the periphery to the center of the seat surface when the cleaning water is discharged from the cleaning water tank body, the drain valve is provided with a condensation suppression part, It has, The condensation suppression portion is provided at the lower end of the drain valve and is a projection that extends downward from the seat surface when the drain valve is seated on the seat surface. A flush toilet device characterized in that the horizontal cross-sectional area of ​​the condensation suppression portion is 1 / 2 or more of the inner area of ​​the sheet surface.

3. A flush toilet device that performs cleaning with cleaning water stored in a cleaning water tank device, A flush toilet body having a bowl section and an inlet for introducing flushing water to clean the bowl section, It has a cleaning water tank device for storing cleaning water for cleaning the bowl portion mentioned above, The above-mentioned washing water tank device is A washing water tank body for storing washing water, A drain outlet that discharges the flushing water from the flushing water tank body and flows it into the inlet of the flush toilet body, This drain opening is surrounded by an annular sheet surface, A drain valve that, when a person sits on or leaves this seat surface, causes the cleaning water to be discharged from the cleaning water tank body and stops, With the drain valve seated on the seat surface, an exhaust passage connects the space below the seat surface with the space above the water level of the cleaning water stored in the cleaning water tank body, To suppress the condensation of the flow of cleaning water from the periphery to the center of the seat surface when the cleaning water is discharged from the cleaning water tank body, the drain valve is provided with a condensation suppression part, It has, The above-mentioned washing water tank device further includes a flow guide section, which is a wall surface provided on the outside of the sheet surface, so as to surround the sheet surface. A flush toilet device characterized in that the water passage extending from the inlet of the flush toilet body is sealed by the flushing water stored inside the flush toilet body, a drainage passage is formed between the seat surface and the drain outlet, the cross-sectional area of ​​the flow path narrows downwards, and in a vertical plane, a straight line passing over the upper end of the flow guide and tangent to the inner wall surface of the drainage passage intersects below the water-sealing surface of the water passage of the flush toilet body.

4. The flush toilet device according to any one of claims 1 to 3, wherein the drain valve is configured to be pulled upward from the seat surface, the exhaust passage is provided in the drain valve and is configured to communicate the lower end of the condensation suppression part with the space above the water level of the flush water stored in the flush water tank body.

Images