Flush toilet apparatus

Abstract

The present invention suppresses a decrease in the instantaneous flow rate of flush water supplied to a flush toilet main body immediately after a drain valve is opened. The present invention is a flush toilet device (1) comprising a flush toilet main body (2) and a flush tank device (4), the flush tank device comprising: a flush tank main body (26); a water outlet (30e); an annular seat surface (26d) provided so as to surround the water outlet; a drain valve (28) seated on the seat surface; an exhaust passage (28b) that, in a state in which the drain valve is seated on the seat surface, communicates a space below the seat surface with a space above the water surface of the wash water stored in the wash water tank main body; and a guide part which is provided to the drain valve or the bottom of the washing water tank main body so as to suppress condensation of the flow of the washing water from the periphery of the seat surface toward the center when the washing water in the washing water tank main body is discharged.

Description

Technical Field

[0001] The present invention relates to a flush toilet device, and in particular to a flush toilet device that is cleaned by flushing water stored in a flushing water tank device. Background Art

[0002] Japanese Patent Application Publication No. 2017-133246 (Patent Document 1) describes a drain valve device. In this device, the valve body of the drain valve is lifted from its valve seat at the bottom of a water storage tank, thereby allowing flushing water in the water storage tank to flow into a drainage space (passageway) and supply flushing water to the toilet body.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2017-133246

[0004] However, in the drain valve device described in Patent Document 1, when the valve body is lifted from the valve seat, flush water from the water tank suddenly flows toward the center of the valve seat. As a result, air in the drain space downstream of the valve seat is drawn into the inflowing flush water, making it difficult to expel the air. This temporarily hinders the flow of flush water from the water tank into the drain space, reducing the initial instantaneous flow rate of flush water supplied to the toilet body. Summary of the Invention

[0005] Therefore, an object of the present invention is to provide a flush toilet apparatus capable of suppressing a drop in the instantaneous flow rate of flush water supplied to a flush toilet body immediately after a drain valve is opened.

[0006] In order to solve the above-mentioned problems, the present invention is a flush toilet device, which is cleaned by washing water stored in a washing tank device. The flush toilet device is characterized in that it has: a flush toilet body, which has a bowl and an inlet for allowing washing water for washing the bowl to flow in; and a washing tank device, which stores washing water for washing the bowl, and the washing tank device has: a washing tank body, which stores washing water; a drain port, which discharges the washing water in the washing tank body and allows the washing water to flow into the inlet of the flush toilet body; an annular a seat surface arranged to surround the drain outlet; a drain valve which stops or discharges the washing water from the washing water tank body by seating on or moving away from the seat surface; an exhaust passage which, when the drain valve is seated on the seat surface, connects the space below the seat surface and the space above the water surface of the washing water stored in the washing water tank body; and a guide portion which is arranged at the bottom of the drain valve or the washing water tank body to suppress the condensation of the washing water flow from the periphery of the seat surface toward the center when the washing water in the washing water tank body is discharged.

[0007] In the present invention configured as described above, a guiding portion is provided to suppress the condensation of the flow of the washing water directed from the periphery of the seat surface toward the center. As a result, the entrainment of the air on the downstream side of the seat surface caused by the washing water flowing in from the periphery of the seat surface is suppressed. Thereby, the air on the downstream side of the seat surface is quickly discharged through the exhaust passage, the obstruction of the flow of the washing water caused by the air is suppressed, and the initial instantaneous flow rate of the washing water supplied to the flush toilet main body can be increased.

[0008] In the present invention, it is preferable that the guiding portion is a condensation suppression portion provided on the drain valve. The drain valve is configured to be lifted upward from the seat surface, and the exhaust passage is configured to be provided on the drain valve, and the lower end of the condensation suppression portion is communicated with a space above the water surface of the washing water stored in the washing water tank main body.

[0009] In the present invention configured as described above, the exhaust passage provided on the drain valve communicates the lower end of the condensation suppression portion with a space above the water surface of the washing water stored in the washing water tank main body. Therefore, the air on the downstream side of the seat surface can be quickly released above the water surface of the washing water, and the influence of the air on the downstream side of the seat surface can be greatly reduced. Thereby, the initial instantaneous flow rate of the washing water supplied to the flush toilet main body can be increased.

[0010] In the present invention, it is preferable that the condensation suppression portion is a protruding portion provided at the lower end of the drain valve and extending downward from the seat surface in a state where the drain valve is seated on the seat surface.

[0011] In the present invention configured as described above, the condensation suppression portion is provided at the lower end of the drain valve and is constituted by a protruding portion extending downward from the seat surface. Therefore, the situation where the washing water flowing in from between the drain valve and the seat surface toward the center of the seat surface directly merges with each other can be prevented. Thereby, the condensation of the flow of the washing water can be suppressed, and the instantaneous flow rate of the washing water can be increased.

[0012] In the present invention, it is preferable that the water passage extending from the inlet of the flush toilet main body is sealed by the washing water stored in the flush toilet main body, and an air layer is formed between the seat surface and the sealing water surface of the water passage.

[0013] In a flush toilet device in which the water passage extending from the inlet of the flush toilet main body is sealed by the washing water stored in the flush toilet main body, the air in the air layer cannot be released to the water passage. In the present invention configured as described above, the condensation of the flow of the washing water is suppressed by the condensation suppression portion, and since the exhaust passage is provided, the air in the air layer can be easily released even in a flush toilet device in which the water passage is sealed, and the adverse influence of the air in the air layer can be effectively suppressed.

[0014] In the present invention, the flush water tank assembly preferably further includes a water flow guide portion that is a wall surface provided on the outer side of the seat surface so as to surround the seat surface.

[0015] According to the present invention constructed as described above, the cleaning water tank device has a water flow guide portion arranged on the outside of the seat surface in a manner surrounding the seat surface, so the flow rate of the cleaning water from between the drain valve and the seat surface toward the center of the seat surface is reduced, which can further suppress the confluence of the cleaning water.

[0016] In the present invention, the water passage extending from the inlet of the flush toilet body is preferably a water seal of the cleaning water stored in the flush toilet body, and a drainage passage with a flow path cross-sectional area narrowing downward is formed between the seat surface and the drain outlet. In the vertical plane, a straight line passing through the upper end of the water flow guide part and tangent to the inner wall surface of the drainage passage intersects with the water sealing surface of the water passage of the flush toilet body below.

[0017] According to the present invention constructed as described above, the straight line passing through the upper end of the water flow guide part and being tangent to the inner wall surface of the drainage passage intersects with the water sealing surface of the water passage of the flush toilet body at a lower position than that of the water sealing surface. Therefore, the cleaning water falling to the water sealing surface through the drainage passage is not easy to merge above the water sealing surface, and the air above the water sealing surface can be easily released from the exhaust passage.

[0018] In addition, the present invention is a flush toilet device that is cleaned by washing water stored in a washing tank device. The flush toilet device is characterized in that it has: a flush toilet body, which has a bowl and an inlet for allowing washing water for washing the bowl to flow in; and a washing tank device, which stores washing water for washing the bowl. The washing tank device has: a washing tank body that stores washing water; a drain port that discharges the washing water in the washing tank body and allows the washing water to flow into the inlet of the flush toilet body; an annular seat surface that is configured to allow the drain port to be opened. Surrounded by; a drain valve, which stops or discharges the cleaning water from the cleaning water tank body by seating on or moving away from the seat surface; and an overflow pipe, which communicates a lower end opening opened in a space lower than the seat surface and an upper end opening opened above the water surface of the cleaning water stored in the cleaning water tank body, a water passage extending from the inlet of the flush toilet body is sealed with cleaning water stored in the flush toilet body, and the drain valve is configured to rotate around a support shaft provided at one end, thereby moving away from the seat surface, and the lower end opening of the overflow pipe is provided on the opposite side of the support shaft.

[0019] According to the present invention configured as described above, the lower end opening of the overflow pipe is provided on the opposite side of the support shaft of the drain valve. Therefore, when the drain valve is opened, the washing water flowing into the seating surface from the opposite side of the support shaft is not easily introduced into the lower end opening of the overflow pipe, and the air between the seating surface and the water seal can be easily discharged through the overflow pipe. Thus, 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 the washing water supplied to the flush toilet body can be increased.

[0020] In the present invention, it is preferable that the washing water tank body has a drain passage formed to extend downward from the bottom surface, and the guiding portion is a water flow guiding portion provided at the bottom of the washing water tank body for reducing the flow velocity of the washing water toward the center of the drain passage within the washing water tank body, and this water flow guiding portion is an enclosing wall surface provided so as to enclose the seating surface on the outer side of the seating surface.

[0021] According to the present invention configured as described above, a water flow guiding portion for reducing the flow velocity of the washing water toward the center of the drain passage is provided at the bottom of the washing water tank body. Therefore, the horizontal component of the flow velocity of the washing water toward the center of the drain passage is reduced. As a result, the washing water flowing out of the washing water tank body easily flows along the inner wall surface of the drain passage provided inside the seating surface, and the situation where the water flow of the washing water peels off from the inner wall surface of the drain passage can be suppressed. Thus, the instantaneous flow rate of the washing water flowing out of the washing water tank body can be increased, and the washing performance of the flush toilet body can be improved. In addition, since the water flow guiding portion is constituted by an enclosing wall surface provided so as to enclose the seating surface on the outer side of the seating surface, the washing water toward the center of the seating surface flows in a manner of crossing the enclosing wall surface, and the horizontal component of the flow velocity of the washing water toward the center of the seating surface can be reduced.

[0022] In the present invention, it is preferable that the upper end of the water flow guiding portion is located above the tangent line at the inlet portion of the drain passage in the vertical section.

[0023] According to the present invention configured as described above, since the upper end of the water flow guiding portion is located above the tangent line of the inlet portion of the drain passage in the vertical section, the washing water toward the center of the seating surface needs to cross a higher water flow guiding portion, and the horizontal component of the flow velocity toward the center of the seating surface can be sufficiently reduced.

[0024] In the present invention, it is preferable that the drain valve is configured to be lifted upward from the seating surface, and in a state where the drain valve is lifted to the highest position, the vertical distance from the upper end of the enclosing wall surface to the drain valve is more than half of the vertical distance from the seating surface to the drain valve.

[0025] According to the present invention constructed as described above, when the drain valve is raised to its highest position, the vertical distance from the upper end of the surrounding wall to the drain valve is at least half the vertical distance from the seat surface to the drain valve. Therefore, a sufficient flow path cross-sectional area for the wash water can be ensured between the upper end of the surrounding wall and the drain valve. Consequently, a momentary decrease in flow rate caused by the provision of the surrounding wall can be avoided.

[0026] In the present invention, it is preferable that a portion of the surrounding wall surface surrounding the seat surface is cut away.

[0027] According to the present invention constructed as described above, a portion of the surrounding wall surrounding the seat surface is cut away, so that a relatively high horizontal component of the flow velocity is maintained in the cut away portion, and the horizontal component of the flow velocity toward the center of the seat surface can be adjusted by the size of the cut away portion.

[0028] Effects of the Invention

[0029] According to the flush toilet apparatus of the present invention, it is possible to suppress a drop in the instantaneous flow rate of flush water supplied to the flush toilet body immediately after the drain valve is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a plan view showing the flush toilet apparatus according to the first embodiment of the present invention.

[0031] Figure 2 In the flush toilet device according to the first embodiment of the present invention, Figure 1 Side cross-sectional view of line II-II.

[0032] Figure 3 This is a cross-sectional view showing, in an enlarged manner, a connection portion between a flush toilet body and a flush water tank body in the flush toilet apparatus according to the first embodiment of the present invention.

[0033] Figure 4 This is a cross-sectional view showing an enlarged portion of a drain port of a flush water tank body included in the flush toilet apparatus according to the first embodiment of the present invention.

[0034] Figure 5 It is a plan view of a flush water tank body included in the flush toilet apparatus according to the first embodiment of the present invention.

[0035] Figure 6 This is a cross-sectional view showing an enlarged view of a drain valve seated on a seat surface in the flush toilet apparatus according to the first embodiment of the present invention.

[0036] Figure 7This is a cross-sectional view showing the flow of flushing water in the flushing water tank main body when the drain valve is opened in the flushing toilet device according to the first embodiment of the present invention.

[0037] Figure 8 This is a cross-sectional view showing the flow of flushing water in the flushing water tank main body in the flushing toilet device according to the comparative example.

[0038] Figure 9 This is an enlarged schematic cross-sectional view showing a part of the flushing water tank device of the flushing toilet device according to the second embodiment of the present invention.

[0039] Figure 10 This is an enlarged cross-sectional view showing the connection part between the flushing toilet main body and the flushing water tank main body in the flushing toilet device according to the third embodiment of the present invention.

[0040] Figure 11 This is a top view of the flushing water tank main body according to the comparative example.

[0041] Figure 12 This is a top view of the flushing water tank main body according to the modified example of the flushing water tank device according to the third embodiment of the present invention. Detailed Embodiments

[0042] Next, with reference to the drawings, the flushing toilet device according to the embodiments of the present invention will be described.

[0043] Figure 1 This is a top view showing the flushing toilet device according to the first embodiment of the present invention. Figure 2 It is along Figure 1 Side cross-sectional view taken along line II-II.

[0044] As Figure 1 and Figure 2 shown, the flushing toilet device 1 according to the first embodiment of the present invention is a siphon jet flushing toilet, having a pottery flushing toilet main body 2, a resin toilet seat and toilet lid (not shown) disposed on the upper surface of the flushing toilet main body 2, and a flushing water tank device 4 disposed at the upper rear of the flushing toilet main body 2 and covered by a resin lid (not shown).

[0045] In the flushing toilet main body 2, there are formed: a basin part 6 for receiving dirt; a drain bend pipe 8 provided at the bottom of the basin part 6 for discharging dirt by siphon action; a border water spray port 10 for performing border water spraying; a border water guide path 12 for guiding flushing water to the border water spray port; a jet water spray port 14 for performing jet water spraying; and a jet water guide path 16 for guiding flushing water to the jet water spray port 14.

[0046] The bowl portion 6 includes a bowl-shaped waste-receiving surface 18, a frame portion 20 formed along the upper edge of the bowl portion 6, and a bracket portion 21 formed between the waste-receiving surface 18 and the frame portion 20. The bowl portion 6 also includes a recessed portion 22 formed below the waste-receiving surface 18 and connected to the drain trap pipe 8. A water-sealing surface W is formed within the recessed portion 22.

[0047] The drainage trap conduit 8 has an inlet 8a, an ascending conduit 8b extending upward from the inlet 8a, a descending conduit 8c extending downward from the ascending conduit 8b, and a top portion 8d located between the descending conduit 8c and the ascending conduit 8b to regulate the sealing water level.

[0048] Here, the lower end of the downcomer conduit 8c of the drain trap conduit 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0049] The frame water outlet 10 is formed on the left rear side of the frame portion 20 when viewing the flush toilet body 2 from the front. The frame water outlet 10 sprays flush water forward, and the flush water flows down toward the waste receiving surface 18 while swirling around the inner peripheral surface of the frame portion 20 and the bracket surface of the bracket portion 21.

[0050] The frame water conduit 12 is formed into a tapered shape with a flow path cross section gradually decreasing toward the frame water outlet 10. Wash water is supplied from the water channel through the wash water tank assembly 4 to the frame water conduit 12, and the wash water is sprayed from the frame water outlet 10 by the water supply pressure of the water channel.

[0051] A jet water spout 14 is formed at the bottom of the bowl 6. The jet water spout 14 is disposed opposite the inlet 8a of the drain trap conduit 8 and faces the inlet 8a of the drain trap conduit 8. The jet water spout 14 sprays washing water toward the inlet 8a of the drain trap conduit 8. This washing water flows into the drain trap conduit 8, thereby initiating a siphon effect.

[0052] The jet water conduit 16 includes an upstream flow path 16a extending forward from the washing water tank device 4; a curved flow path 16b curved from the upstream flow path; and a downstream flow path 16c extending rearward from the curved flow path and connected to the jet water outlet 14. Washing water is supplied from the washing water tank body 26 of the washing water tank device 4 to the jet water conduit 16, and the washing water is sprayed from the jet water outlet 14 by the water head pressure of the washing water. As described above, in this embodiment, the washing water sprayed from the frame water outlet 10 is directly supplied from the water channel, and the washing water sprayed from the jet water outlet 14 is supplied from the washing 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 flush water to be sprayed is supplied from a flush water tank.

[0053] Next, with reference to the new Figures 3 to 6 , the structure of the flushing water tank device 4 of the first embodiment of the present invention will be described.

[0054] Figure 3 is a cross-sectional view showing an enlarged connection portion between the flushing toilet main body 2 and the flushing water tank main body 26 in the flushing toilet device 1 of the present embodiment. Figure 4 is a cross-sectional view showing an enlarged portion of the drain port of the flushing water tank main body 26 included in the flushing water tank device 4. In addition, Figure 5 is a top view of the flushing water tank main body 26 included in the flushing water tank device 4. Figure 6 is a cross-sectional view showing an enlarged drain valve seated on the seat surface.

[0055] As Figure 1 and Figure 2 shown, the flushing water tank device 4 includes: a valve unit 24 that supplies and stops the flushing water from the water supply; a resin-made flushing water tank main body 26 that stores the flushing water supplied via the valve unit 24; and a drain valve 28 that discharges the flushing water from the flushing water tank main body 26 or stops the flushing water.

[0056] The valve unit 24 is configured to include a water supply solenoid valve 24a for the water tank, a solenoid valve 24b for border spraying, etc., and controls the supply and stop of the water supply from the water supply to the inside of the flushing water tank main body 26 and the spraying and stop of the water supply from the border spraying port 10.

[0057] As Figure 3 shown, the flushing water tank main body 26 is configured to store the flushing water for flushing the flushing toilet main body, and is fixed to the flushing toilet main body 2 via a base plate 30. In addition, a drain valve 28 and a drain valve drive mechanism 32 are disposed inside the flushing water tank main body 26. The drain valve 28 is lifted by the drain valve drive mechanism 32, whereby the drain valve 28 is opened, and the flushing water is discharged from the flushing water tank main body 26. The flushing water discharged from the flushing water tank main body 26 flows into the injection water guide path 16 provided inside the flushing toilet main body 2 through the inflow port 2a provided on the upper surface of the rear portion of the flushing toilet main body 2. That is, in the present embodiment, the injection water guide path 16 constitutes a water passage extending from the inflow port 2a of the flushing toilet main body 2.

[0058] In the present embodiment, the flushing water tank main body 26 is a small resin-made water tank having a volume of approximately 2 liters. As Figure 2As shown, the lower part of the cleaning water tank main body 26 is disposed below the upper surface of the border part 20 of the flushing toilet main body 2, and is disposed above the top 8d of the drain bend pipe 8. Thus, the flushing toilet device 1 becomes a low-profile toilet. In addition, in the present embodiment, the cleaning water in the cleaning water tank main body 26 is ejected from the ejection water spray port 14 by gravity.

[0059] As Figure 3 shown, a circular protruding part 26a protruding downward is provided on the bottom surface of the cleaning water tank main body 26. The inner side of the circular protruding part 26a constitutes a drainage passage 26b, and the drainage passage 26b is formed to extend downward from the bottom surface of the cleaning water tank main body 26. And, a groove 26c is formed on the outer peripheral surface of the protruding part 26a, and a circular O-ring 34 is embedded in the groove 26c. On the other hand, a circular drainage opening 30a is provided on the base plate 30 that supports the cleaning water tank main body 26. The circular opening at the lower end of the drainage passage 26b is formed to have substantially the same diameter as the drainage opening 30a provided on the base plate 30, and the drainage passage 26b and the drainage opening 30a are smoothly connected. Moreover, in the present embodiment, the lower end of the drainage opening 30a functions as the drain port 30e of the cleaning water tank device 4. In addition, the drain port may be integrally formed with the cleaning water tank main body.

[0060] In addition, on the bottom surface of the base plate 30, a cylindrical part 30b protruding downward is provided so as to surround the drainage opening 30a. In addition, a circular upper surface recess 30c is formed on the upper side surface of the bottom surface of the base plate 30 so as to surround the drainage opening 30a. On the other hand, a circular lower surface recess 30d is formed on the lower side surface of the bottom surface of the base plate 30 so as to surround the cylindrical part 30b.

[0061] And, in the upper surface recess 30c formed on the upper surface of the base plate 30, the protruding part 26a protruding from the bottom surface of the cleaning water tank main body 26 is accommodated. As described above, by fitting the protruding part 26a of the cleaning water tank main body 26 into the upper surface recess 30c of the base plate 30, the O-ring 34 disposed on the outer periphery of the protruding part 26a is squeezed and deformed in the radial direction of the drainage passage 26b, thereby sealing between the cleaning water tank main body 26 and the base plate 30.

[0062] On the other hand, a seal 36 is disposed in the circular lower surface recess 30d formed on the lower surface of the base plate 30. The seal 36 is integrally formed in a circular shape and is fitted around the cylindrical part 30b formed on the inner periphery of the lower surface recess 30d and is accommodated in the lower surface recess 30d. The base plate 30 is fixed to the upper surface of the rear part of the flushing toilet main body 2 by a plurality of bolts 38 (only 1 bolt is shown in Figure 3 ).

[0063] As a result, the seal 36 disposed in the lower surface recess 30d of the base plate 30 is compressed between the base plate 30 and the flush toilet body 2. Specifically, when the flush water tank body 26 is secured to the flush toilet body 2 via the base plate 30, the seal 36 is sandwiched between the lower surface recess 30d of the base plate 30 and the periphery of the inlet 2a on the upper surface of the flush toilet body 2, causing compression and deformation. This ensures watertightness between the base plate 30 and the flush toilet body 2.

[0064] Next, if Figure 4 As shown, the drainage passage 26b is formed as a passage extending downward from the bottom surface of the washing water tank body 26, has a circular cross section, and is configured so that the flow path cross-sectional area narrows toward the bottom. In addition, the inner wall surface of the drainage passage 26b is Figure 4 In the vertical cross section shown in FIG. 26 , the drain passage 26 b is curved upward and convex. In addition, an annular seat surface 26 d ( Figure 5 The seat surface 26d is a narrow annular surface, and the drain valve 28 opens and closes the drain port of the washing water tank body 26 by seating on or moving away from the seat surface 26d, thereby stopping and draining the washing water.

[0065] That is, when the bowl 6 of the flush toilet body 2 is cleaned, the drain valve 28 is opened. Figure 4 From the closed valve position P1 shown by the dashed line to the open valve position P2 shown by the dotted line, the drain valve driving mechanism 32 ( Figure 3 ) is lifted. When drain valve 28 is in the closed position P1 and seated on seat surface 26d, the discharge of washing water from washing water tank body 26 is stopped. Furthermore, when drain valve 28 is moved to the open position P2 and removed from seat surface 26d, the washing water from washing water tank body 26 is discharged.

[0066] And, as Figure 4 and Figure 5 As shown, a water flow guide 40 is provided at the bottom of the wash water tank body 26, surrounding the seat surface 26d. This water flow guide 40 is a wall surface that rises vertically from the outside of the seat surface 26d, surrounding the seat surface 26d. It forms a concentric circle with the circular seat surface 26d. As described above, the provision of the water flow guide 40 reduces the flow rate of the wash water within the wash water tank body 26 as it flows toward the center C of the drainage passage 26b.

[0067] In addition, if Figure 4As shown, the surrounding wall surface forming the water flow guiding portion 40 is configured such that its upper end is located above the tangent line L1 tangent to the inner wall surface of the drainage passage 26b at the inlet portion at the upper end of the drainage passage 26b. By configuring the water flow guiding portion 40 in the above manner, the cleaning water flowing toward the center C of the drainage passage 26b near the bottom surface of the cleaning water tank main body 26 hits the water flow guiding portion 40 and temporarily moves upward, so that the velocity component of the cleaning water toward the center C of the drainage passage 26b is reduced.

[0068] Moreover, in the present embodiment, the surrounding wall surface forming the water flow guiding portion 40 is cut away at four positions on the circumference. That is, as Figure 5 shown, in the water flow guiding portion 40, cut-away portions 40a are provided at four equally spaced positions on the circumference, and at these portions, the height of the surrounding wall surface is reduced. As described above, at the portions where the cut-away portions 40a are provided, the velocity component of the cleaning water from the periphery of the drain opening toward the center C of the drainage passage 26b is hardly reduced. Therefore, the size of the average velocity component toward the center C of the drainage passage 26b can be adjusted by the number and size of the cut-away portions 40a provided in the water flow guiding portion 40.

[0069] In addition, as Figure 4 indicated by the center dash line, in the state where the drain valve 28 is lifted to the highest height, i.e., the valve opening position P2, the vertical distance D1 from the upper end of the water flow guiding portion 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. As described above, by setting the distance from the upper end of the water flow guiding portion 40 to the drain valve 28, it is possible to ensure a sufficient flow path cross-sectional area between the water flow guiding portion 40 and the drain valve 28 while arranging the water flow guiding portion 40 around the seat surface 26d.

[0070] Next, with reference to Figure 6 , the detailed structure of the drain valve 28 will be described.

[0071] First, as Figure 6 shown, in the standby state of the flushing toilet device 1, the cleaning water is filled in the water passage extending from the inflow port 2a, i.e., the injection water passage 16, up to the water level of the water sealing surface W, and the injection water passage 16 is sealed by the cleaning water. The height of this water sealing surface W is defined by the height of the top 8d ( Figure 2 ) of the drain bend pipe 8 and is the same as the water storage level stored in the basin portion 6. Thus, when the drain valve 28 is seated on the seat surface 26d and the flushing toilet device 1 is in the standby state, the space between the seat surface 26d and the water sealing surface W of the injection water passage 16 becomes an air layer A.

[0072] Moreover, as Figure 6As shown, the drain valve 28 has: a disk portion 28a that seats on the seat surface 26d; an exhaust passage 28b that extends vertically upward from the upper surface of the disk portion 28a; a condensation suppression portion 28c that extends downward from the lower surface of the disk portion 28a; and a bead chain 28d that extends vertically upward in the exhaust passage 28b from the center of the disk portion 28a. Further, in the present embodiment, the condensation suppression portion 28c functions as a guiding portion, and is provided on the drain valve 28 so as to suppress the condensation of the flow of the washing water from the periphery of the seat surface 26d toward the center when the washing water in the washing water tank main body 26 is drained.

[0073] The disk portion 28a is a flat plate formed in an annular plate shape having an outer diameter larger than that of the seat surface 26d, and seats on the seat surface 26d, whereby the drainage of the washing water in the washing water tank main body 26 is stopped.

[0074] The exhaust passage 28b is a cylindrical pipe that extends vertically upward from the upper surface of the disk portion 28a in a concentric circle with the disk portion 28a, and its upper end extends above the water surface of the washing water stored in the washing water tank main body 26 in the standby state of the flushing toilet device 1 ( Figure 3 ). Therefore, in a state where the drain valve 28 seats on the seat surface 26d, the air layer A on the lower side compared to the seat surface 26d and the space on the upper side compared to the water surface of the washing water stored in the washing water tank main body 26 communicate through the exhaust passage 28b. In other words, since the injection water guide path 16 is sealed by the sealing water surface W, the space between the seat surface 26d and the sealing water surface W of the injection water guide path 16 communicates with the outside air only through the exhaust passage 28b.

[0075] The condensation suppression portion 28c is a cylindrical protrusion that extends downward from the lower surface of the disk portion 28a in a concentric circle with the disk portion 28a, and its lower end is open. The condensation suppression portion 28c extends in a manner protruding downward compared to the seat surface 26d in a state where the drain valve 28 seats on the seat surface 26d. Moreover, the air layer A on the lower side of the seat surface 26d communicates with the space above the water surface of the washing water in the washing water tank main body 26 through the condensation suppression portion 28c, the disk portion 28a, and the exhaust passage 28b. As will be described later, by providing the condensation suppression portion 28c on the drain valve 28, the condensation of the flow of the washing water from the periphery of the seat surface 26d toward the center when the washing water in the washing water tank main body 26 is drained is suppressed.

[0076] In addition, the lower end of the bead chain 28d is connected to the disk portion 28a of the drain valve 28, extends through the inside of the exhaust passage 28b, and the upper end is connected to the drain valve drive mechanism 32 ( Figure 3 ). Thus, during toilet flushing, if the bead chain 28d is pulled upward by the drain valve drive mechanism 32, the drain valve 28 is lifted, and the disk portion 28a is moved away from the seat surface 26d.

[0077] Also, as Figure 6 shown, in a state where 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 configured to be 1 / 3 or more of the vertical distance H2 from the seat surface 26d to the sealing water surface W of the injection water guide path 16. In addition, the horizontal cross-sectional area of the outer periphery of the condensation suppression portion 28c is configured to be 1 / 2 or more of the area inside the seat surface 26d. As described above, the space between the seat surface 26d and the sealing water surface W of the injection water guide path 16 is occupied by the condensation suppression portion 28c, whereby condensation of the washing water when the washing water in the washing water tank main body 26 starts to flow into the inside of the seat surface 26d can be suppressed.

[0078] In addition, as Figure 6 shown, in the vertical plane, a straight line L2 passing through the upper end of the water flow guiding portion 40 and tangent to the inner wall surface of the drain passage 26b intersects below the sealing water surface W of the injection water guide path 16 of the flush toilet main body 2. The water flow guiding portion 40 and the drain passage 26b are configured in the above-described manner, whereby it is possible to suppress a situation where the washing water flowing along the inner wall surface of the drain passage 26b from the periphery of the seat surface 26d and crossing the upper end of the water flow guiding portion 26b joins together before falling onto the sealing water surface W. Thereby, it is possible to suppress a situation where the washing water flowing in from the periphery of the seat surface 26d entangles the air in the air layer A below the seat surface 26d and disturbs the water flow of the washing water.

[0079] Next, with reference to Figure 7 and Figure 8 , the operation of the flush toilet device 1 according to the first embodiment of the present invention will be described.

[0080] Figure 7 is a cross-sectional view showing the water flow of the washing water in the washing water tank main body 26 when the drain valve 28 is opened. Figure 8 is a cross-sectional view showing the water flow of the washing water in the washing water tank of the flush toilet device according to the comparative example.

[0081] First, if the user performs a cleaning operation of the flush toilet device 1, a controller (not shown) provided in the flush toilet device 1 sends a control signal to the frame spraying electromagnetic valve 24b ( Figure 1 ) of the valve unit 24 to open the frame spraying electromagnetic valve 24b.

[0082] Thereby, the washing water supplied from the water supply passes through the frame spraying electromagnetic valve 24b and the frame water guide path 12 and is sprayed from the frame spraying port 10. The washing water sprayed from the frame spraying port 10 forms a swirling flow on the dirt receiving surface 18 of the basin portion 6 to clean the dirt receiving surface 18.

[0083] After the frame water spraying electromagnetic valve 24b is opened, if a predetermined time has passed, the controller (not shown) controls the drain valve driving mechanism 32 ( Figure 3 ) sends a control signal to operate the motor (not shown) of the drain valve driving mechanism 32, thereby 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 drainage passage 26b of the flush water tank body 26 and into the inlet 2a ( Figure 3 ), and is ejected from the jet water outlet 14 through the jet water conduit 16. The water sprayed from the jet water outlet 14 causes a siphon phenomenon in the drain bend pipe 8, and the washing water and dirt in the basin 6 are discharged through the drain bend pipe 8.

[0084] Here, when the disk portion 28a of the drain valve 28 is lifted from the seat surface 26d of the flush water tank body 26, the washing water in the flush water tank body 26 suddenly begins to flow toward the center C of the drain passage 26b (drain port). In other words, at the moment the drain valve 28 is lifted, the washing water in the flush water tank body 26 flows through the gap between the lower surface of the disk portion 28a and the seat surface 26d toward the center C of the drain passage 26b, and then falls downward in the drain passage 26b.

[0085] At this time, the condensation-preventing portion 28c is provided on the lower surface of the disc portion 28a so as to protrude downward. Therefore, the flush water flowing from the periphery of the seat surface 26d toward the center C of the drain outlet 30e hits the outer peripheral surface of the condensation-preventing portion 28c and falls downward. As a result, a large amount of flush water flowing into the inner side of the seat surface 26d flows smoothly along the inner wall surface of the drain passage 26b into the inlet 2a of the flush toilet body 2.

[0086] On the other hand, when wash water flows into the space (air layer A) between the seat surface 26d and the water sealing surface W of the jet water conduit 16, the air is squeezed out and flows into the exhaust passage 28b, outflowing to the space above the water surface of the wash water tank body 26. At this time, the wash water flows along the inner wall surface of the drainage passage 26b, so it is unlikely to mix with the air in the air layer A, and quickly flows into the exhaust passage 28b and is discharged into the atmosphere.

[0087] Specifically, the "condensation" of wash water flowing from the periphery of seat surface 26d toward center C of drain outlet 30e is suppressed, and the air in air layer A is rapidly discharged through exhaust passage 28b located in the center of seat surface 26d. This prevents the air in air layer A from being drawn into the wash water and hindering its rapid flow. As a result, the instantaneous flow rate of wash water discharged from the wash water tank body 26 can be increased immediately after drain valve 28 is opened.

[0088] On the contrary, as Figure 8 shown in the comparative example, in the case where the condensation suppression portion is not provided in the drain valve 228 and the water flow guiding portion is not provided around the seat surface 226d, if the drain valve 228 is moved away from the seat surface 226d, the washing water in the washing water tank main body 226 suddenly flows toward the center C of the drain port. That is, as Figure 8 shown, the washing water flows from the periphery of the seat surface 226d toward the center C, collides with each other near the center of the drain port, and merges. The washing water that has merged near the center of the drain port falls after passing near the center of the drain passage 226b, and a region where there is no washing water flow is temporarily generated at the peripheral portion of the drain passage 226b. That is, in the existing drain valve 228 in which the condensation suppression portion is not provided, condensation of the washing water flow occurs immediately after the valve is opened, and the actual flow path cross-sectional area becomes narrow. As a result, the instantaneous flow rate of the washing water immediately after the drain valve 228 is opened decreases.

[0089] On top of that, the washing water flowing from the periphery of the seat surface 226d toward the center C collides with each other near the center of the drain port, and thus the air existing in the drain passage 226b is sometimes entrained into the washing water, forming large bubbles in the washing water. The air in the bubbles as described above is not easily discharged even when the drain valve 228 is provided with an exhaust passage, and tends to stay inside the drain passage 226b. Due to the trapped air, the effective flow path cross-sectional area inside the drain passage 226b becomes narrow, and the instantaneous flow rate of the washing water immediately after the drain valve 228 is opened decreases.

[0090] The decrease in the instantaneous flow rate caused by the trapped air as described above is likely to occur in a flush toilet device 1 of the present embodiment, such as a flush toilet in which the water passage extending from the water inlet of the flush toilet main body is sealed with washing water. That is, in a flush toilet in which the water passage is sealed with washing water, there are few paths for releasing the air trapped in the water passage, and it is easy to cause retention due to the air being entrained by the washing water. In the flush toilet device 1 of the present embodiment, by providing the condensation suppression portion 28c in the drain valve 28, it is possible to suppress the condensation of the washing water and quickly discharge the air trapped in the water passage from the exhaust passage 28b, thereby suppressing the adverse effects caused by the trapped air.

[0091] Moreover, in the flush toilet device 1 of the present embodiment, a water flow guiding portion 40 is provided around the annular seat surface 26d so as to surround the seat surface 26d. Therefore, as Figure 4As shown, the water flow from the periphery of the seat surface 26d toward the center C of the drainage passage 26b is as shown by arrow F1. After temporarily rising upward in a manner that crosses the water flow guiding portion 40, it flows downward into the drainage passage 26b. Moreover, the water flow F1 of the washing water that flows into the drainage passage 26b after crossing the water flow guiding portion 40 falls along the inner wall surface of the drainage passage 26b. Thereby, condensation of the washing water at the moment when the drainage valve 28 is lifted from the seat surface 26d is suppressed, and the washing water in the washing water tank main body 26 can smoothly flow into the drainage passage 26b. As a result, the instantaneous flow rate of the washing water flowing from the washing water tank main body 26 into the injection water guide passage 16 becomes large.

[0092] That is, in the flushing toilet device 1 of the present embodiment, when the drainage valve 28 is opened, the water flow of the washing water toward the center C of the drainage passage 26b temporarily rises upward through the water flow guiding portion 40. Therefore, the horizontal component of the water flow of the washing water is appropriately reduced. Thus, the water flow of the washing water flowing into the drainage passage 26b does not peel off from the inner wall surface of the drainage passage 26b, and the washing water can smoothly flow along the inner wall surface of the drainage passage 26b, and the instantaneous flow rate can be increased.

[0093] As described above, after the drainage valve 28 is lifted from the seat surface 26d and the washing water is ejected from the injection water spout 14, after a predetermined time, the controller (not shown) sends a control signal to the side frame spraying electromagnetic valve 24b to close the side frame spraying electromagnetic valve 24b. Thereby, the side frame spraying from the side frame water spout 10 stops, and one-time toilet washing is completed.

[0094] In the flushing toilet device 1 according to the first embodiment of the present invention, a condensation suppression portion 28c that suppresses condensation of the water flow of the washing water from the periphery of the seat surface 26d toward the center C is provided in the drainage valve 28. Therefore, entrainment of air on the downstream side of the seat surface 26d caused by the washing water flowing in from the periphery of the seat surface 26d is suppressed. Thereby, the air on the downstream side of the seat surface quickly discharges through the exhaust passage 28b, suppression of interference with the water flow of the washing water caused by the air is achieved, and the initial instantaneous flow rate of the washing water supplied to the flushing toilet main body 2 can be improved.

[0095] In addition, in the flushing toilet device 1 according to the present embodiment, the exhaust passage 28b provided in the drainage valve 28 connects the lower end of the condensation suppression portion 28c and a space above the water surface of the washing water stored in the washing water tank main body 26. Therefore, the air on the downstream side of the seat surface 26d can be quickly released to the upper side of the water surface of the washing water, and the influence of the air on the downstream side of the seat surface 26d can be greatly reduced. Thereby, the initial instantaneous flow rate of the washing water supplied to the flushing toilet main body 2 can be improved.

[0096] Furthermore, in the flush toilet apparatus 1 of this embodiment, the condensation suppressor 28c is provided at the lower end of the drain valve 28 and comprises a protruding portion extending downward from the seat surface 26d. This prevents flush water flowing from between the drain valve 28 and the seat surface 26d toward the center of the seat surface 26d from directly merging with each other. This suppresses condensation of the flush water flow and improves the instantaneous flow rate of the flush water.

[0097] In addition, according to the flush toilet device 1 of this embodiment, the condensation of the water flow of the cleaning water is suppressed by the condensation suppression portion 28c, and the exhaust passage 28b is provided. Therefore, in the flush toilet device 1 in which the jet water conduit 16 serving as the 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.

[0098] 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 portion 28c is more than 1 / 3 of the distance from the seat surface 26d to the water sealing surface W of the water passage, so that the confluence of the washing water flowing 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 washing water can be fully suppressed.

[0099] Furthermore, according to the flush toilet apparatus 1 of this embodiment, the horizontal cross-sectional area of the condensation suppressing portion 28c is equal to or greater than 1 / 2 of the area inside the seat surface 26d. Therefore, the flush water flowing below the condensation suppressing portion 28c is less likely to merge, and condensation of the flush water can be sufficiently suppressed.

[0100] Furthermore, according to the flush toilet device 1 of this embodiment, the water flow guide portion 40 is provided on the outside of the seat surface 26d so as to surround the seat surface 26d. Therefore, the flow rate of the washing 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 the washing water can be further suppressed.

[0101] In addition, according to the flush toilet device 1 of this embodiment, the straight line passing through the upper end of the water flow guide part 40 and being tangent to the inner wall surface of the drainage passage 26b intersects with the water sealing surface W of the water passage of the flush toilet body 2, that is, the jet water guide passage 16, at a lower position than that. Therefore, the cleaning water falling to the water sealing surface W through the drainage passage 26b is not easy to merge above the water sealing surface W, and the air above the water sealing surface W can be easily released from the exhaust passage 28b.

[0102] Next, refer to Figure 9 , a flush toilet device according to a second embodiment of the present invention will be described.

[0103] Figure 9This is a cross-sectional view schematically showing an enlarged portion of a flush water tank assembly of a flush toilet apparatus according to a second embodiment of the present invention.

[0104] like Figure 9 As shown in FIG. 1 , a flush toilet apparatus 100 according to a second embodiment of the present invention includes a flush toilet body 102 and a flush water tank apparatus 104 .

[0105] The flush water tank assembly 104 includes a flush water tank body 126, a drain valve 128, and a drain valve drive mechanism 132. When the toilet is flushed, if the drain valve 128 is opened, the flush water in the flush water tank body 126 is discharged and flows into the water passage 102b from the inlet 102a of the flush toilet body 102.

[0106] A drainage passage 126b extending vertically downward is provided at the bottom of the flush water tank body 126. When the drain valve 128 is opened, the flush water within the flush water tank body 126 is discharged through the drainage passage 126b. Specifically, the interior of the drainage passage 126b functions as a drain port, draining the flush water from the flush water tank body 126 and allowing 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. When the drain valve 128 seats on this seat surface 126d, closing the valve, the discharge of flush water is stopped.

[0107] On the other hand, an overflow pipe 130 is connected to the drain passage 126b. The lower opening 130a of the overflow pipe 130 is located on the inner wall of the drain passage 126b, while the upper opening 130b is located above the surface of the wash water in the wash water tank body 126. Specifically, the overflow pipe 130 extends horizontally from the lower opening 130a, located on the vertically facing inner wall of the drain passage 126b, then bends vertically to reach the upper opening 130b. This overflow pipe 130 connects the atmosphere above the water surface in the wash water tank body 126 with the air layer A below the seat surface 126d.

[0108] 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 front end of the arm portion 128b is rotatably supported by a support shaft 128c extending in the horizontal direction. In this embodiment, the support shaft 128c is as shown in FIG. Figure 9 As shown, it is provided on the opposite side of the lower end opening 130a provided in the drainage passage 126b. In addition, a bead chain 128d is attached to the upper surface of the float portion 128a, and the upper end of the bead chain 128d is connected to the drainage valve drive mechanism 132.

[0109] The drain valve drive mechanism 132 is provided at the upper part of the cleaning water tank device 104 and is configured to lift the bead chain 128d upward during toilet cleaning. When the float part 128a is seated on the seat surface 126d, the bead chain 128d is lifted upward, whereby the float part 128a rotates about the support shaft 128c, and the float part 128a moves away from the seat surface 126d. Thereby, the drain valve 128 is opened, and the cleaning water in the cleaning water tank main body 126 flows into the inlet 102a of the flushing toilet main body 102 through the drain passage 126b. In addition, in the present embodiment, the drain valve drive mechanism 132 is constituted by a manual rod (not shown), but the drain valve drive mechanism 132 can also be constituted by a motor (not shown) or the like.

[0110] Next, the operation of the flushing toilet device 100 according to the second embodiment of the present invention will be described.

[0111] First, in the flushing toilet device 100 of the present embodiment, the water passage 102b extending from the inlet 102a of the flushing toilet main body 102 is also sealed with the cleaning water stored in the flushing toilet main body 102. That is, in the standby state of the flushing 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 cleaning water tank main body 126, and the air layer A is filled with air.

[0112] Next, if the user performs a cleaning operation, the bead chain 128d is lifted upward, whereby the float part 128a of the drain valve 128 rotates about the support shaft 128c. Thereby, the float part 128a moves away from the seat surface 126d, and the discharge of the cleaning water in the cleaning water tank main body 126 starts. Here, if the float part 128a rotates about the support shaft 128c, on the opposite side of the support shaft 128c ( Figure 9 the left side in the figure), the float part 128a is greatly separated from the seat surface 126d. Therefore, especially at the beginning of the discharge of the cleaning water, the cleaning water mainly flows into the drain passage 126b through the gap on the opposite side of the support shaft 128c between the float part 128a and the seat surface 126d.

[0113] As a result, the cleaning water in the cleaning water tank main body 126 flows as shown by the arrow F in Figure 9 the figure from the opposite side of the support shaft 128c toward the support shaft 128c and into the inside of the seat surface 126d. Thereby, the main flow of the cleaning water flowing into the inside of the seat surface 126d flows into the drain passage 126b in a manner that flies over the lower end opening 130a of the overflow pipe 130 opening on the opposite side of the support shaft 128c. Therefore, the air in the air layer A below the seat surface 126d is not involved in the inflowing cleaning water, and quickly flows into the lower end opening 130a of the overflow pipe 130 and is discharged to the atmosphere from the upper end opening 130b.

[0114] Specifically, immediately after the wash water begins to be discharged, the wash water flows over the lower opening 130a located on the opposite side of the support shaft 128c. Therefore, lower opening 130a is not blocked by the wash water. As a result, the air in air layer A can be quickly discharged through overflow pipe 130. Therefore, in this embodiment, overflow pipe 130 functions as an exhaust passage. As described above, the air in air layer A can be quickly discharged, so the flow of wash water is not obstructed by trapped air, thereby increasing the instantaneous flow rate of wash water immediately after the discharge begins.

[0115] According to the flush toilet apparatus 100 of the second embodiment of the present invention, the lower end opening 130a of the overflow pipe 130 is located on the opposite side of the support shaft 128c of the drain valve 128. Therefore, when the drain valve 128 is open, the flush water flowing into the seat surface 126d from the opposite side of the support shaft 128c is less likely to flow into the lower end opening 130a of the overflow pipe 130. This allows the air in the air layer A between the seat surface 126d and the sealing water to be easily discharged through the overflow pipe 130. This facilitates the release of the air in the air layer A, effectively suppressing the adverse effects of the air in the air layer A and increasing the initial instantaneous flow rate of the flush water supplied to the flush toilet body 102.

[0116] Next, refer to Figure 10 and Figure 11 , a flush toilet device according to a third embodiment of the present invention will be described.

[0117] The flush toilet device of this embodiment differs from the first embodiment described above in the structure of the lower end portion of the drain valve. Therefore, the following describes only the parts of the flush toilet device involved in the third embodiment of the present invention that are different from the first embodiment, and the description of the first embodiment described above applies to the parts that are the same as the first embodiment. In particular, the structure of the flush water tank body in the flush toilet device of the third embodiment of the present invention is different from the structure of the flush water tank body in the first embodiment ( Figure 4 and Figure 5 ) are the same as those in the first embodiment, and descriptions of these parts are omitted.

[0118] Figure 10 This is a cross-sectional view showing, in enlarged form, the connection portion between the flush toilet body 2 and the flush water tank body 26 in the flush toilet device 1 according to the third embodiment of the present invention.

[0119] like Figure 10As shown, the flush water tank body 26 is configured to store flush water used to clean the flush toilet body and is secured to the flush toilet body 2 via a base plate 30. Furthermore, a drain valve 328 and a drain valve drive mechanism 32 are disposed within the flush water tank body 26. The drain valve drive mechanism 32 lifts the drain valve 328, thereby opening the drain valve 328 and draining the flush water from the flush water tank body 26. The flush water discharged from the flush water tank body 26 flows through an inlet 2a provided on the rear upper surface of the flush toilet body 2 and into the jet conduit 16 provided within the flush toilet body 2.

[0120] And, as Figure 10 As shown, the drain valve 328 includes: a disk portion 328a that is seated on the seat surface 26d; an exhaust passage 328b that extends vertically upward from the upper surface of the disk portion 328a; and a bead chain 328d that extends vertically upward from the center of the disk portion 328a in the exhaust passage 328b. As described above, the difference between this embodiment and the first embodiment is that the condensation suppression portion 28c is not provided on the lower side of the disk portion 328a. Figure 6 ).

[0121] The disc portion 328a is a flat plate formed in an annular plate shape having an outer diameter larger than the seat surface 26d. When the disc portion 328a is seated on the seat surface 26d, the discharge of the washing water in the washing water tank body 26 is stopped.

[0122] The exhaust passage 328b is a cylindrical tube extending vertically upward from the upper surface of the disc portion 328a in a concentric circle with the disc portion 328a, and its upper end extends to a position above the water surface of the flush water stored in the flush water tank body 26 in the waiting state of the flush toilet device 1.

[0123] The lower end of the bead chain 328d is connected to the disk portion 328a of the drain valve 328, extends through the interior of the exhaust passage 328b, and is connected to the drain valve drive mechanism 32 at its upper end. Therefore, when the bead chain 328d is pulled upward by the drain valve drive mechanism 32 during toilet flushing, the drain valve 328 is lifted and the disk portion 328a is removed from the seat surface 26d.

[0124] Next, the operation of the flush toilet apparatus according to the third embodiment of the present invention will be described.

[0125] First, when the user performs a flushing operation of the flush toilet apparatus 1, a controller (not shown) provided in the flush toilet apparatus 1 controls the electromagnetic valve 24b ( Figure 1)Send a control signal to open the electromagnetic valve 24b for border water spraying. Thus, the cleaning water supplied from the water supply passes through the electromagnetic valve 24b for border water spraying and the border water guide path 12 and is ejected from the border water spraying port 10. The cleaning water ejected from the border water spraying port 10 forms a swirling flow on the dirt receiving surface 18 of the basin part 6 to clean the dirt receiving surface 18.

[0126] After the electromagnetic valve 24b for border water spraying is opened, if a predetermined time has elapsed, the controller (not shown) sends a control signal to the drain valve driving mechanism 32 ( Figure 10 ) to operate the motor (not shown) provided in the drain valve driving mechanism 32 to lift the drain valve 328 from the seat surface 26d of the cleaning water tank main body 26. Thus, the drain valve 328 is opened, and the cleaning water stored in the cleaning water tank main body 26 flows into the inflow port 2a of the flushing toilet main body 2 through the drain passage 26b of the cleaning water tank main body 26 ( Figure 10 ) and is ejected from the jet water spraying port 14 through the jet water guide path 16. By the water spraying from the jet water spraying port 14, a siphon phenomenon is caused in the drain bend pipe 8, and the cleaning water and dirt in the basin part 6 are discharged through the drain bend pipe 8.

[0127] Here, if the drain valve 328 is lifted from the seat surface 26d of the cleaning water tank main body 26, the cleaning water in the cleaning water tank main body 26 suddenly starts to flow toward the center C of the drain passage 26b (drain port) ( Figure 4 ). That is, at the moment when the drain valve 328 is lifted, the cleaning water in the cleaning water tank main body 26 moves from the gap between the bottom surface of the drain valve 328 and the seat surface 26d toward the center C of the drain passage 26b and then falls downward in the drain passage 26b.

[0128] At this time, a water flow guiding part 40 is provided around the annular seat surface 26d so as to surround the seat surface 26d. Therefore, the water flow toward the center C of the drain passage 26b is as shown by the arrow F1 ( Figure 4 ), temporarily moves upward in a manner of crossing over the water flow guiding part 40 and then moves downward and flows into the drain passage 26b. Moreover, the water flow F1 of the cleaning water flowing into the drain passage 26b after crossing over the water flow guiding part 40 falls along the inner wall surface of the drain passage 26b. Thus, at the moment when the drain valve 328 is lifted from the seat surface 26d, the cleaning water in the cleaning water tank main body 26 can smoothly flow into the drain passage 26b. As a result, the instantaneous flow rate of the cleaning water flowing from the cleaning water tank main body 26 into the jet water guide path 16 can be increased.

[0129] In contrast, as Figure 11As in the case of the cleaning water tank main body 326 of the comparative example shown, when the water flow guiding portion 40 is not provided around the seat surface 326d, at the moment when the drain valve 328 is lifted from the seat surface 326d, the cleaning water flows into the center of the drain passage 326b at an extremely high flow rate through the gap between the bottom surface of the drain valve 328 and the seat surface 326d. Therefore, the cleaning water flowing in through the gap between the drain valve 328 and the seat surface 326d flows in a substantially horizontal direction as shown by the arrow F3 in Figure 11 . As a result, immediately after the drain valve 328 is lifted from the seat surface 326d, the cleaning water does not flow along the inner wall surface of the drain passage 326b, and the effective flow cross-sectional area becomes narrow. Thereby, the flow rate at the moment immediately after the drain valve 328 is lifted decreases. In other words, when the water flow guiding portion 40 is not provided, the horizontal component of the water flow of the cleaning water becomes too large, and immediately after the drain valve 328 is opened, the water flow of the cleaning water peels off from the inner wall surface of the drain passage 326b, generating a region B where the cleaning water does not flow. As a result, the flow path resistance when flowing from the cleaning water tank main body 326 into the drain passage 326b increases, and the instantaneous flow rate decreases.

[0130] On the other hand, in the flushing toilet device according to the third embodiment of the present invention shown in Figure 10 , when the drain valve 328 is opened, the water flow of the cleaning water toward the center C of the drain passage 26b is temporarily directed upward ( Figure 4 ) due to the water flow guiding portion 40. Therefore, the horizontal component of the water flow of the cleaning water is appropriately reduced. Therefore, the water flow of the cleaning water flowing into the drain passage 26b does not peel off from the inner wall surface of the drain passage 26b, and the cleaning water can flow smoothly along the inner wall surface of the drain passage 26b, and the instantaneous flow rate can be increased.

[0131] Moreover, in the flushing toilet device of the present embodiment, a water flow guiding portion 40 is provided on the bottom surface of the cleaning water tank main body 26, and a cutout portion 40a is provided in the water flow guiding portion 40. At the portion where the cutout portion 40a is provided, as shown by the arrow F2 ( Figure 4 ), the water flow of the cleaning water from the periphery of the water flow guiding portion 40 toward the center C of the drain passage 26b does not flow upward, but flows into the inside of the water flow guiding portion 40 in a substantially horizontal direction. Therefore, the cleaning water passing through the cutout portion 40a flows toward the center C of the drain passage 26b at a relatively high flow rate and then merges with the cleaning water that has passed over the water flow guiding portion 40 and flows into the drain passage 26b.

[0132] As described above, in the portion of the water flow guiding portion 40 where the cutting portion 40a is provided, the horizontal component of the flow velocity of the washing water becomes larger. On the other hand, in the portion where the water flow guiding portion 40 is crossed, the horizontal component of the flow velocity of the washing water becomes smaller. Therefore, the average flow velocity of the washing water toward the center C of the drainage passage 26b can be adjusted by the size and number of the cutting portions 40a provided in the water flow guiding portion 40. In the present embodiment, within the range where peeling does not occur on the inner wall surface of the drainage passage 26b, the size and number of the cutting portions 40a provided in the water flow guiding portion 40 are set so that the flow velocity of the washing water toward the center C of the drainage passage 26b is increased as much as possible.

[0133] As described above, after the drain valve 328 is lifted from the seat surface 26d and the washing water is ejected from the ejection water spray port 14, after a predetermined time, the controller (not shown) sends a control signal to the frame water spray solenoid valve 24b to close the frame water spray solenoid valve 24b. Thereby, the frame water spray from the frame water spray port 10 stops, and one-time toilet washing is completed.

[0134] According to the flushing toilet device of the third embodiment of the present invention, a water flow guiding portion 40 for reducing the flow velocity of the washing water in the washing water tank main body 26 toward the center C of the drainage passage 26b is provided at the bottom of the washing water tank main body 26. Therefore, the horizontal component of the flow velocity of the washing water toward the center C of the drainage passage 26b is reduced. As a result, the washing water flowing out from the washing water tank main body 26 easily flows along the inner wall surface of the drainage passage 26b provided inside the seat surface 26d, and the situation where the water flow of the washing water peels off from the inner wall surface of the drainage passage 26b can be suppressed. Thereby, the instantaneous flow rate of the washing water flowing out from the washing water tank main body 26 can be increased, and the washing performance of the flushing toilet main body 2 can be improved.

[0135] In addition, according to the flushing toilet device of the present embodiment, the water flow guiding portion 40 is constituted by an enclosing wall surface provided outside the seat surface 26d so as to enclose the seat surface 26d. Therefore, the washing water toward the center C of the seat surface 26d flows in a manner of crossing the enclosing wall surface, and the horizontal component of the flow velocity of the washing water toward the center of the seat surface 26d can be reduced.

[0136] Moreover, according to the flushing toilet device of the present embodiment, the upper end of the water flow guiding portion 40 is located above the tangent line L1 ( Figure 4 ) of the inlet portion of the drainage passage 26b in the vertical section. Therefore, the washing water toward the center C of the seat surface 26d needs to cross a higher water flow guiding portion 40, and the horizontal component of the flow velocity toward the center C of the seat surface 26d can be sufficiently reduced.

[0137] In addition, in the flushing toilet device according to the present embodiment, in a state where the drain valve 328 is lifted to the highest position, the vertical distance D1 from the upper end of the surrounding wall surface (water flow guiding portion 40) to the drain valve 328 ( Figure 4 ) is more than half of the vertical distance D2 from the seat surface 26d to the drain valve 328. Therefore, a sufficient flow path cross-sectional area of the washing water can be ensured between the upper end of the surrounding wall surface and the drain valve 328. Therefore, a decrease in the instantaneous flow rate caused by the provision of the surrounding wall surface can be avoided.

[0138] Moreover, in the flushing toilet device according to the present embodiment, a part of the surrounding wall surface (water flow guiding portion 40) surrounding the seat surface is cut off ( Figure 4 , Figure 5 ). Therefore, a horizontal direction component with a relatively large flow velocity is maintained at the cut-off portion (cut-off portion 40a), and the horizontal direction component of the flow velocity toward the center of the seat surface 26d can be adjusted by the size of the cut-off.

[0139] As described above, the embodiments of the present invention have been described, but various changes can be made to the above embodiments.

[0140] For example, in the above-described third embodiment, the surrounding wall surface constituting the water flow guiding portion is separated from the side wall surface of the washing water tank main body, but as Figure 12 shown, a part of the surrounding wall surface can also be integrated with the side wall surface of the washing water tank main body. That is, in the Figure 12 shown modification, a surrounding wall surface 352 is provided as a water flow guiding portion so as to surround the periphery of the seat surface 350a of the washing water tank main body 350. The surrounding wall surface 352 is provided concentrically with the circular seat surface 350a, and a part of it is integrated with one side wall surface 350b of the washing water tank main body 350. As described above, when a part of the surrounding wall surface 352 is integrated with the side wall surface 350b of the washing water tank main body 350, the horizontal direction component of the flow velocity toward the center C of the seat surface 350a can also be reduced by the surrounding wall surface 352, and the instantaneous flow rate of the washing water flowing in the drain passage 350c can be increased.

[0141] Explanation of reference numerals

[0142] 1 Flushing toilet device

[0143] 2 Flushing toilet main body

[0144] 2a Inlet

[0145] 4 Washing water tank device

[0146] 6 Basin portion

[0147] 8 Drain elbow pipe

[0148] 8a Inlet

[0149] 8b Rising pipeline

[0150] 8c Falling pipeline

[0151] 8d Top

[0152] 10 Frame water spray nozzle

[0153] 12 Frame water guide path

[0154] 14 Jet water spray nozzle

[0155] 16 Jet water guide path

[0156] 16a Upstream side flow path

[0157] 16b Bending flow path

[0158] 16c Downstream side flow path

[0159] 18 Dirt receiving surface

[0160] 20 Frame part

[0161] 21 Bracket part

[0162] 22 Groove part

[0163] 24 Valve unit

[0164] 24a Solenoid valve for water supply to water tank

[0165] 24b Solenoid valve for frame water spray

[0166] 26 Cleaning water tank main body

[0167] 26a Protrusion

[0168] 26b Drainage passage

[0169] 26c Groove

[0170] 26d Seat surface

[0171] 28 Drain valve

[0172] 28a Disc part

[0173] 28b Exhaust passage

[0174] 28c Condensation inhibition part (protrusion, guide part)

[0175] 28d Bead chain

[0176] 30 Base plate

[0177] 30a Drain opening

[0178] 30b Cylinder part

[0179] 30c Upper surface concave part

[0180] 30d Lower surface concave part

[0181] 30e Drainage port

[0182] 32 Drain valve drive mechanism

[0183] 34 O-ring

[0184] 36 Sealing member

[0185] 38 Bolt

[0186] 40 Water flow guiding part

[0187] 40a Notch part

[0188] 100 Flushing toilet device

[0189] 102 Flushing toilet main body

[0190] 102a Inlet

[0191] 102b Water passage

[0192] 104 Flushing water tank device

[0193] 126 Flushing water tank main body

[0194] 126b Drainage passage

[0195] 126d Seat surface

[0196] 128 Drain valve

[0197] 128a Float part

[0198] 128b Arm part

[0199] 128c Support shaft

[0200] 128d Bead chain

[0201] 130 Overflow pipe

[0202] 130a Lower end opening

[0203] 130b Upper end opening

[0204] 132 Drain valve drive mechanism

[0205] 226 Flushing water tank main body

[0206] 226b Drainage passage

[0207] 226d Seat surface

[0208] 228 drain valve

[0209] 326 cleaning water tank body

[0210] 326b Drainage channel

[0211] 326d seat

[0212] 328 drain valve

[0213] 328a Disc

[0214] 328b Exhaust passage

[0215] 328d bead necklace

[0216] 350 cleaning water tank body

[0217] 350a seat

[0218] 350b sidewall

[0219] 350c drainage channel

[0220] 352 surrounding wall

Claims

1. A flushing toilet device that is cleaned by the cleaning water stored in a cleaning water tank device. The flushing toilet device is characterized by comprising: A flushing toilet main body having a basin portion and an inlet through which cleaning water for cleaning the basin portion flows in; and A cleaning water tank device that stores cleaning water for cleaning the basin portion. The cleaning water tank device has: A cleaning water tank main body that stores cleaning water; A drain outlet that discharges the cleaning water in the cleaning water tank main body and causes the cleaning water to flow into the inlet of the flushing toilet main body; An annular seat surface that is arranged to surround the drain outlet; A drain valve that stops or discharges the cleaning water from the cleaning water tank main body by sitting on or moving away from the seat surface; An exhaust passage that communicates a space below the seat surface and a space above the water surface of the cleaning water stored in the cleaning water tank main body when the drain valve is sitting on the seat surface; and A guiding portion that is provided at the bottom of the drain valve or the cleaning water tank main body to suppress the condensation of the water flow of the cleaning water from the periphery of the seat surface toward the center when discharging the cleaning water in the cleaning water tank main body.

2. The flushing toilet device according to claim 1, wherein The guiding portion is a condensation suppression portion provided on the drain valve, the drain valve is configured to be lifted upward from the seat surface, and the exhaust passage is configured to be provided on the drain valve to communicate the lower end of the condensation suppression portion and a space above the water surface of the cleaning water stored in the cleaning water tank main body.

3. The flushing toilet device according to claim 2, wherein The condensation suppression portion is a protruding portion provided at the lower end of the drain valve and extending downward relative to the seat surface when the drain valve is sitting on the seat surface.

4. The flushing toilet device according to claim 2, wherein The water passage extending from the inlet of the flushing toilet main body is sealed by the cleaning water stored in the flushing toilet main body, and an air layer is formed between the seat surface and the water sealing surface of the water passage.

5. The flushing toilet device according to claim 1, wherein The cleaning water tank device further has a water flow guiding portion, and the water flow guiding portion is a wall surface provided outside the seat surface so as to surround the seat surface.

6. The flushing toilet device according to claim 5, wherein The water passage extending from the inlet of the flushing toilet main body is sealed by the cleaning water stored in the flushing toilet main body, a drain passage with a flow cross-sectional area narrowing downward is formed between the seat surface and the drain outlet, and in a vertical plane, a straight line passing through the upper end of the water flow guiding portion and tangent to the inner wall surface of the drain passage intersects below the water sealing surface of the water passage of the flushing toilet main body.

7. A flushing toilet device that is cleaned by the cleaning water stored in a cleaning water tank device. The flushing toilet device is characterized by comprising: a flush toilet body having a bowl and an inlet for allowing flushing water to flow in for flushing the bowl; and a washing water tank device for storing washing water for washing the basin; The cleaning water tank device comprises: A cleaning water tank body storing cleaning water; a drain port for discharging the cleaning water in the cleaning water tank body so that the cleaning water flows into the inlet port of the flush toilet body; an annular seat surface, which is configured to surround the drain opening; a drain valve that stops or drains the washing water from the washing water tank body by seating on or moving away from the seat surface; as well as an overflow pipe communicating between a lower end opening opened in a space below the seat surface and an upper end opening opened above a water surface of the washing water stored in the washing water tank body; The water passage extending from the inlet of the flush toilet body is a water passage for flushing water seal water stored in the flush toilet body. The drain valve is configured to be moved away from the seat surface by rotating around a support shaft provided at one end thereof, and the lower end opening of the overflow pipe is provided on the opposite side of the support shaft.

8. The flush toilet device according to claim 1, wherein: The cleaning water tank body has a drainage passage extending downward from the bottom surface. The guide portion is arranged at the bottom of the cleaning water tank body. In the cleaning water tank body, the water flow guide portion reduces the flow rate of the cleaning water toward the center of the drainage passage. The water flow guide portion is an enclosing wall surface arranged on the outer side of the seat surface in a manner that surrounds the seat surface.

9. The flush toilet device according to claim 8, wherein: The upper end of the water flow guide is located above a tangent line at the inlet of the drainage passage in a vertical cross section.

10. The flush toilet device according to claim 8, wherein: The drain valve is constructed to be lifted upward from the seat surface. When the drain valve is lifted to the highest position, the vertical distance from the upper end of the surrounding wall surface to the drain valve is more than half of the vertical distance from the seat surface to the drain valve.

11. The flush toilet device according to claim 8, wherein: A portion of the surrounding wall surface surrounding the seat surface is cut away.

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