Washing water tank device and water-washing toilet device equipped with the same

Abstract

To provide a washing water tank device capable of opening a drain valve with sufficient driving force after a delay after water discharge from an upper water discharge port is started.SOLUTION: A washing water tank device (4) for supplying washing water to an upper water discharge port and a lower water discharge port comprises: a washing water tank body (10); a drain valve (12) that switches draining / stopping of washing water in the washing water tank body to discharge washing water from the lower water discharge port; a water pressure drive mechanism (14) for driving the drain valve using supply water pressure of washing water; a first on-off valve (19) for switching water discharge / stop of the washing water from the upper water discharge port; a second on-off valve (18) for switching water supply / stop of the washing water supplied from a water supply source to the water pressure drive mechanism; and a delayed valve opening mechanism (21) that after water discharge from the upper water discharge port is started using part of washing water introduced via the first on-off valve, opens the second on-off valve after a delay of a predetermined time to supply washing water to the water pressure drive mechanism.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a washing water tank device, and more particularly to a washing water tank device for supplying washing water to an upper water discharge port above the water storage surface of a flush toilet body and a lower water discharge port below the water storage surface, and a flush toilet device provided with the same.

Background Art

[0002] Japanese Patent Application Laid-Open No. 6-146365 (Patent Document 1) describes a toilet washing tank device. In this toilet washing tank device, when the lever handle is rotated, the lever member is pushed down. As a result, the switching valve is switched to the rim water passage side and the water supply valve is opened. Thereby, the discharge of the washing water supplied from a water supply source such as a water supply starts from the rim water passage portion. Here, a branch portion is provided in the water passage leading from the switching valve to the rim water passage portion, and a part of the washing water branched at this branch portion flows into a small water tank (chamber) provided inside the tank.

[0003] Furthermore, a float is disposed inside the small water tank. When washing water accumulates in the small water tank, buoyancy acts on the float. A drain valve body is connected below the float. When washing water accumulates in the water tank, the drain valve body is pulled up by the buoyancy acting on the float, and the drain valve body is opened. Thereby, after the discharge from the rim water passage portion starts, the drain valve body is pulled up with a delay for only the time until a predetermined amount of washing water accumulates in the water tank, and the washing water stored inside the tank is supplied to the toilet.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, in the toilet flushing tank device described in Patent Document 1, a part of the flushing water supplied to the rim water passage portion is branched and stored in a small water tank, and the buoyancy acting on the float disposed in this water tank pulls up the drain valve body. As a result, after the water discharge from the upper water discharge port (rim water passage portion) is started, the drain valve (drain valve body) is opened with a delay, and the flushing of the toilet is executed. However, there is a problem that it is difficult to obtain a sufficient driving force to pull up the drain valve body only by the buoyancy acting on the float. That is, the water head pressure of the flushing water stored inside the tank acts on the drain valve body, and a driving force to overcome this is required to pull up the drain valve body. Therefore, in order to obtain a sufficient driving force, it is necessary to use a very large float, and when the float is enlarged, there is a problem that the amount of flushing water that can be stored in the tank decreases.

[0006] Therefore, an object of the present invention is to provide a flushing water tank device that can open a drain valve with a sufficient driving force with a delay after the water discharge from the upper water discharge port is started, and a flush toilet device equipped with the same.

Means for Solving the Problems

[0007] In order to solve the above-described problems, the present invention is a flushing water tank device for supplying flushing water to an upper water discharge port above the water storage surface of a flush toilet body and a lower water discharge port below the water storage surface, a flushing water tank main body; a drain valve that switches the discharge and stop of the flushing water stored in the flushing water tank main body to thereby switch the discharge and stop of the flushing water from the lower water discharge port; a hydraulic drive mechanism that drives the drain valve by the water supply pressure of the flushing water supplied from a water supply source; a first on-off valve that switches the discharge state and the discharge stop state of the flushing water supplied from the water supply source from the upper water discharge port based on a user's operation; a second on-off valve that switches the water supply and stop of the flushing water supplied from the water supply source to the hydraulic drive mechanism; and a delay opening valve mechanism that uses a part of the flushing water introduced through the first on-off valve to open the second on-off valve with a predetermined delay after the water discharge from the upper water discharge port is started, and supplies the flushing water to the hydraulic drive mechanism.

[0008] In the present invention configured as described above, the drain valve switches the discharge and stop of the cleaning water stored in the cleaning water tank body, and also switches the discharge and stop of the cleaning water from the lower water discharge port. On the other hand, the first on-off valve switches the discharge state and the discharge stop state of the cleaning water supplied from the water supply source from the upper water discharge port. Further, the water pressure driving mechanism is configured to drive the drain valve by the water supply pressure of the cleaning water supplied from the water supply source, and the water supply and stop to the water pressure driving mechanism are switched by the second on-off valve. The delayed valve opening mechanism uses a part of the cleaning water introduced through the first on-off valve to open the second on-off valve after a predetermined time delay after the water discharge from the upper water discharge port starts, supplies the cleaning water to the water pressure driving mechanism, and thereby opens the drain valve.

[0009] According to the present invention configured as described above, since the water pressure driving mechanism drives the drain valve by the water supply pressure of the cleaning water supplied from the water supply source, the drain valve can be driven with sufficient driving force. Further, since the delayed valve opening mechanism supplies the cleaning water to the water pressure driving mechanism and opens the drain valve after a predetermined time delay after the water discharge from the upper water discharge port starts, the water discharge from the lower water discharge port can be started after a delay after the water discharge from the upper water discharge port starts, and the toilet bowl main body can be effectively cleaned.

[0010] In the present invention, preferably, the delayed valve opening mechanism includes a balance float arranged to receive buoyancy from the cleaning water stored in the cleaning water tank body, a water receiving portion configured such that a part of the cleaning water introduced through the first on-off valve flows in, and a second on-off valve driving mechanism connected to the balance float and the water receiving portion. The second on-off valve driving mechanism opens the second on-off valve when the weight of the water receiving portion increases due to the inflow of the cleaning water and overcomes the buoyancy acting on the balance float.

[0011] According to the present invention configured as described above, when the weight of the water receiving portion increases due to the inflow of washing water and overcomes the buoyancy acting on the balance float, the second on-off valve is opened, and as a result, the drain valve is opened. Therefore, the time until the second on-off valve is opened can be freely set by the configuration of the water receiving portion and the balance float. Also, by designing the buoyancy acting on the balance float to be small, the water receiving portion can also be miniaturized.

[0012] In the present invention, preferably, further, a water discharge port supply pipe connected to the downstream side of the first on-off valve and communicating with the upper water discharge port is provided, and a branch portion is provided in this water discharge port supply pipe, and the washing water branched at this branch portion flows into the water receiving portion.

[0013] According to the present invention configured as described above, by the design of the branch portion provided in the water discharge port supply pipe, the flow rate of the washing water flowing into the water receiving portion can be freely set, and the delay time until the drain valve is opened can be freely set.

[0014] In the present invention, preferably, the water receiving portion is provided with a discharge hole for discharging the washing water in the water receiving portion into the washing water tank main body, and this discharge hole discharges the washing water at a flow rate less than the flow rate of the washing water flowing into the water receiving portion.

[0015] According to the present invention configured as described above, the water receiving portion is provided with a discharge hole for discharging the washing water in the water receiving portion at a flow rate less than the flow rate of the inflowing washing water. Therefore, while the washing water is flowing in, the weight of the water receiving portion increases, and the buoyancy acting on the balance float can be overcome. Also, after the inflow of the washing water stops, the washing water in the water receiving portion is discharged, and it can be automatically restored to the initial state.

[0016] In the present invention, preferably, the water receiving portion is disposed above the water surface at the water stop level of the washing water tank main body.

[0017] According to the present invention configured as described above, since the water receiving portion is disposed above the water surface in the cleaning water tank body at the water stop level, no buoyancy acts on the water receiving portion itself, and the weight of the cleaning water accumulated in the water receiving portion can be effectively utilized.

[0018] In the present invention, preferably, the water receiving portion includes a connecting portion, and the water receiving portion is connected to the balance float with a space therebetween above the balance float by the connecting portion.

[0019] According to the present invention configured as described above, since the water receiving portion and the balance float are connected with a space therebetween by the connecting portion, the positional relationship between the water receiving portion and the balance float can be freely designed.

[0020] In the present invention, preferably, the second on-off valve includes a diaphragm valve, a pressure chamber that presses the diaphragm valve, and a pilot valve that controls the pressure in the pressure chamber, and the second on-off valve drive mechanism opens and closes the pilot valve based on the gravity acting on the water receiving portion and the buoyancy acting on the balance float.

[0021] According to the present invention configured as described above, since the second on-off valve drive mechanism opens and closes the pilot valve of the second on-off valve based on the gravity acting on the water receiving portion and the buoyancy acting on the balance float, the second on-off valve can be opened and closed with a small force acting on the water receiving portion and the balance float. Therefore, the degree of freedom in the design of the water receiving portion and the balance float can be increased.

[0022] Further, the present invention is a flushing toilet device, comprising a flushing toilet body having an upper water discharge port above the water storage surface and a lower water discharge port below the water storage surface, and the cleaning water tank device of the present invention that supplies cleaning water to the upper water discharge port and the lower water discharge port.

Advantages of the Invention

[0023] According to the cleaning water tank device of the present invention and the flush toilet device equipped with the same, after the water discharge from the upper water discharge port is started, the drain valve can be opened with sufficient driving force after a delay.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Embodiments for Carrying Out the Invention

[0025] Next, a flushing toilet device according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing an entire flushing toilet device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the entire flushing toilet device according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing a schematic configuration of a cleaning water tank device according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing a schematic configuration of a drain valve hydraulic drive unit provided in the cleaning water tank device according to the first embodiment of the present invention. FIG. 5 is a perspective view showing an entire cleaning water tank device according to the first embodiment of the present invention.

[0026] As shown in FIGS. 1 and 2, a flushing toilet device 1 according to the first embodiment of the present invention is composed of a flushing toilet main body 2 and a cleaning water tank device 4 according to the first embodiment of the present invention placed on the rear part thereof. The flushing toilet device 1 of the present embodiment is configured such that, after use, the bowl portion 2a of the flushing toilet main body 2 is cleaned by operating a lever handle 8 provided in the cleaning water tank device 4. The cleaning water tank device 4 according to the present embodiment is configured to supply the cleaning water stored therein and the cleaning water supplied from a water supply source, i.e., a water supply C, to the flushing toilet main body 2 based on the operation of the lever handle 8, and to clean the bowl portion 2a with these cleaning waters.

[0027] Further, as a modification, the present invention can also be configured such that the cleaning of the bowl portion 2a is performed by operating a remote control device (not shown) attached to the wall surface. Alternatively, the present invention can also be configured such that after a human presence sensor (not shown) provided in the toilet seat detects the user's leaving the seat, the cleaning of the bowl portion 2a is performed after a predetermined time has elapsed. In this case, the human presence sensor (not shown) can be provided in the toilet seat or at a position where it can detect the user's sitting, leaving, approaching, departing, or hand-waving actions, and can be provided, for example, in the flushing toilet body 2 or the cleaning water tank device 4. Also, the human presence sensor (not shown) only needs to be able to detect the user's sitting, leaving, approaching, departing, or hand-waving actions, and for example, an infrared sensor or a microwave sensor can be used as the human presence sensor. As described above, in this specification, "based on the user's operation" means any action of the user that serves as a trigger for starting the toilet cleaning.

[0028] Next, as shown in FIG. 2, the cleaning water tank device 4 includes a water storage tank 10 which is a cleaning water tank body for storing the cleaning water to be supplied to the flushing toilet body 2, a drain valve 12 for opening and closing a drain port 10a provided in the water storage tank 10, and a drain valve hydraulic drive unit 14 which is a hydraulic drive mechanism for driving the drain valve 12. Further, the cleaning water tank device 4 has a water supply control valve 19 which is a first on-off valve for directly supplying the cleaning water supplied from the water supply C to the flushing toilet body 2. Here, the cleaning water stored in the water storage tank 10 and flowing out by opening the drain valve 12 is configured to be discharged from a jet outlet 2b which is a lower discharge port provided below the water surface W of the bowl portion 2a of the flushing toilet body 2 during toilet cleaning. Also, the cleaning water supplied from the water supply C and supplied via the water supply control valve 19 is configured to be discharged from a rim outlet 2d which is an upper discharge port provided in the rim portion 2c of the bowl portion 2a above the water surface W of the bowl portion 2a during toilet cleaning.

[0029] Next, as shown in FIGS. 3 and 5, the washing water tank device 4 further includes a water supply valve drive mechanism 16 which is a first on-off valve drive mechanism that moves the water supply control valve 19 from a stop position where it is in a discharge stop state to a discharge position where it is in a discharge state based on a user's operation, and a biasing mechanism 17 that generates a biasing force so that the water supply valve drive mechanism 16 is moved to the stop position. The washing water tank device 4 also has a holding mechanism 20 that holds the water supply valve drive mechanism 16 moved to the discharge position against the biasing force by the biasing mechanism 17. Furthermore, the washing water tank device 4 includes a drain valve control valve 18 which is a second on-off valve that controls the water supply to the drain valve hydraulic drive unit 14, and a delay opening valve mechanism 21 that uses a part of the washing water introduced through the water supply control valve 19 to open the drain valve control valve 18 with a predetermined time delay after the water discharge from the rim water discharge port 2d is started, and supplies the washing water to the drain valve hydraulic drive unit 14.

[0030] The water storage tank 10 is a tank configured to store the washing water to be supplied to the jet water discharge port 2b of the flush toilet main body 2, and a drain port 10a (FIG. 3) for discharging the stored washing water to the flush toilet main body 2 is formed at the bottom thereof. Also, in the water storage tank 10, an overflow pipe 10b is connected downstream of the drain port 10a. This overflow pipe 10b rises vertically from the vicinity of the drain port 10a and extends above the water stop level L1 of the washing water stored in the water storage tank 10. Therefore, the washing water flowing in from the upper end of the overflow pipe 10b bypasses the drain port 10a and directly flows out from the jet water discharge port 2b of the flush toilet main body 2.

[0031] As shown in FIG. 4, the drain valve 12 is a valve body arranged to open and close the drain port 10a. When the drain valve 12 is pulled upward, it opens, and the washing water in the water storage tank 10 is discharged to the flush toilet main body 2 and discharged from the jet water discharge port 2b provided at the lower part of the bowl portion 2a.

[0032] Next, with reference to FIG. 4, the structure of the drain valve hydraulic drive unit 14 is shown. The drain valve hydraulic drive unit 14 is configured to drive the drain valve 12 by utilizing the water supply pressure of the cleaning water supplied from the water supply C. As shown in FIG. 4, the drain valve hydraulic drive unit 14 includes a cylinder 14a into which the water flowing out from the drain valve control valve 18 and supplied through the inflow pipe 23 flows, a piston 14b slidably disposed within the cylinder 14a, and a rod 15 protruding from the lower end of the cylinder 14a to drive the drain valve 12. Further, a spring 14c is disposed inside the cylinder 14a to bias the piston 14b downward, and a packing 14e is attached to the piston 14b to ensure watertightness between the inner wall surface of the cylinder 14a and the piston 14b. Also, the cylinder 14a is supported above the drain port 10a by a frame 14g. Further, a clutch mechanism 22 is provided in the middle of the rod 15, and by this clutch mechanism 22, the rod 15 is separated into an upper rod 15a and a lower rod 15b.

[0033] The cylinder 14a is a cylindrical member, its axis is arranged in the vertical direction, and it slidably receives the piston 14b inside. Also, the inflow pipe 23 is connected to the lower end of the cylinder 14a so that the water flowing out from the drain valve control valve 18 flows into the cylinder 14a from the lower end. For this reason, the piston 14b inside the cylinder 14a is pushed upward against the biasing force of the spring 14c by the water flowing into the cylinder 14a.

[0034] On the other hand, an outflow hole is provided at the upper end of the cylinder 14a, and the outflow pipe 24 communicates with the inside of the cylinder 14a through this outflow hole. Therefore, when water flows into the cylinder 14a from the inflow pipe 23 connected to the lower part of the cylinder 14a, the piston 14b is pushed upward from the lower part to the upper part of the cylinder 14a. And when the piston 14b is pushed upward above the outflow hole, the water flowing into the cylinder 14a flows out through the outflow hole and through the outflow pipe 24. That is, when the piston 14b is moved upward, the inflow pipe 23 and the outflow pipe 24 are communicated with each other through the inside of the cylinder 14a.

[0035] Also, as shown in FIGS. 3 and 5, a branch portion 24a is provided in the outflow pipe 24. The first downcomer 24b branched from this branch portion 24a opens downward within the overflow pipe 10b. Further, the second downcomer 24c extending downward from the branch portion 24a discharges water into the water storage tank 10. Therefore, a part of the washing water flowing out from the cylinder 14a flows into the overflow pipe 10b, and the remaining washing water is stored in the water storage tank 10.

[0036] Next, as shown in FIG. 4, the rod 15 is a rod-shaped member connected to the lower surface of the piston 14b, and extends downward from inside the cylinder 14a through a through hole 14f formed in the bottom surface of the cylinder 14a. Further, a drain valve 12 is connected to the lower end of the rod 15, and the rod 15 connects the piston 14b and the drain valve 12. For this reason, when water flows into the cylinder 14a and the piston 14b is pushed upward, the rod 15 connected to the piston 14b lifts the drain valve 12 upward, and the drain valve 12 is opened.

[0037] Also, a gap 14d is provided between the rod 15 protruding from below the cylinder 14a and the inner wall of the through hole 14f of the cylinder 14a, and a part of the water flowing into the cylinder 14a flows out from this gap 14d. The water flowing out from the gap 14d flows into the water storage tank 10. Note that since this gap 14d is relatively narrow and the flow path resistance is large, even when water is flowing out from the gap 14d, the pressure inside the cylinder 14a increases due to the water flowing into the cylinder 14a from the inflow pipe 23, and the piston 14b is pushed upward against the biasing force of the spring 14c.

[0038] Furthermore, a clutch mechanism 22 is provided in the middle of the rod 15. The clutch mechanism 22 is configured to disconnect the rod 15 into an upper rod 15a and a lower rod 15b when the drain valve 12 is lifted by a predetermined distance together with the rod 15. In a state where the clutch mechanism 22 is disengaged, the lower rod 15b no longer moves in conjunction with the movement of the upper part of the piston 14b and the upper rod 15a, and the lower rod 15b, together with the drain valve 12, descends due to gravity while resisting buoyancy.

[0039] In addition, a drain valve float mechanism 26 is provided in the vicinity of the drain valve 12. This drain valve float mechanism 26 is configured to delay the closing of the drain port 10a by causing the rod 15 to be lifted by a predetermined distance and then, after the lower rod 15b is disengaged by the clutch mechanism 22, causing the lower rod 15b and the drain valve 12 to descend. Specifically, the drain valve float mechanism 26 includes a float portion 26a and an engaging portion 26b interlocked with the float portion 26a.

[0040] The engaging portion 26b is engaged with the lower rod 15b that has been disengaged and descended by the clutch mechanism 22, and is configured to prevent the lower rod 15b and the drain valve 12 from descending and seating on the drain port 10a. Next, as the water level in the water storage tank 10 drops, the float portion 26a descends. When the water level in the water storage tank 10 drops to a predetermined level, the float portion 26a rotates the engaging portion 26b, and the engagement between the engaging portion 26b and the lower rod 15b is released. By releasing the engagement, the lower rod 15b and the drain valve 12 descend and seat on the drain port 10a. As a result, the closing of the drain valve 12 is delayed, and an appropriate amount of washing water is discharged from the drain port 10a.

[0041] Also, as shown in FIG. 3, a constant flow valve 30a is provided on the upstream side of the drain valve control valve 18. This constant flow valve 30a is configured to adjust the flow rate so that the washing water supplied from the water supply C flows into the drain valve control valve 18 at an appropriate flow rate to operate the drain valve hydraulic drive unit 14. Further, a vacuum breaker 30b is provided in the inflow pipe 23 connecting the drain valve control valve 18 and the drain valve hydraulic drive unit 14. When the drain valve control valve 18 side becomes negative pressure due to this vacuum breaker 30b, outside air is sucked into the inflow pipe 23, preventing the backflow of water from the drain valve hydraulic drive unit 14 side.

[0042] Next, the drain valve control valve 18 includes a control valve main body 18a, a main valve body 18b which is a diaphragm valve disposed within the control valve main body 18a, and a pilot valve port 18c (FIG. 11). As will be described later, the pilot valve port 18c provided in the drain valve control valve 18 is configured to be opened and closed by a pilot valve 21f (FIG. 11) provided in the delay valve opening mechanism 21. That is, the pilot valve 21f forms a part of the drain valve control valve 18 and controls the pressure within a pressure chamber 18d (FIG. 11) provided within the control valve main body 18a. When the pilot valve port 18c is closed by the pilot valve 21f, the pressure within the pressure chamber 18d rises and the main valve body 18b closes. Also, when the pilot valve port 18c is opened, the pressure within the pressure chamber 18d drops and the main valve body 18b of the drain valve control valve 18 opens. Thereby, based on the operation of the delay valve opening mechanism 21, the main valve body 18b of the drain valve control valve 18 opens and closes, controlling the supply of and stop of water supply to the drain valve hydraulic drive unit 14.

[0043] That is, the drain valve control valve 18 controls the supply of and stop of the supplied cleaning water to the drain valve hydraulic drive unit 14. In the present embodiment, as shown in FIG. 3, all of the cleaning water flowing out from the drain valve control valve 18 is supplied to the drain valve hydraulic drive unit 14 through the inflow pipe 23. A part of the cleaning water supplied to the drain valve hydraulic drive unit 14 flows out from the gap 14d between the inner wall of the through hole 14f (FIG. 4) of the cylinder 14a and the rod 15 and flows into the water storage tank 10. Also, most of the water supplied to the drain valve hydraulic drive unit 14 flows out from the cylinder 14a through the outflow pipe 24 and flows into the overflow pipe 10b and the water storage tank 10 respectively, as described above.

[0044] On the other hand, as shown in FIG. 3, the cleaning water supplied from the water supply C is supplied to the drain valve control valve 18 via a stop valve 32a, a constant flow rate valve 32b, a water supply pipe branch portion 33, and a first branch pipe 33a. The stop valve 32a is disposed outside the water storage tank 10, and a constant flow rate valve 32b is connected to the inside of the water storage tank 10 on the downstream side thereof. A water supply pipe branch portion 33 is provided on the downstream side of the constant flow rate valve 32b, and a first branch pipe 33a branched at the water supply pipe branch portion 33 is connected to the drain valve control valve 18.

[0045] The stop valve 32a is provided to stop the supply of water to the washing water tank device 4 during maintenance or the like, and is normally used in an open state. The constant flow valve 32b is provided to allow the water supplied from the water supply C to flow into the drain valve control valve 18 and the water supply control valve 19 at a predetermined flow rate, and is configured to supply a constant flow rate of water regardless of the installation environment of the flush toilet device 1.

[0046] On the other hand, the second branch pipe 33b branched at the water supply pipe branch portion 33 is connected to the water supply control valve 19. The water supply control valve 19 is configured to allow the water supplied from the second branch pipe 33b to flow out into the rim water supply pipe 25 which is the water discharge port water supply pipe. The rim water supply pipe 25 communicates with the rim water discharge port 2d of the flush toilet body 2 (not shown in FIG. 3), and the washing water flowing into the rim water supply pipe 25 is discharged from the rim water discharge port 2d as rim washing water for washing the bowl portion 2a. Further, a vacuum breaker 31 (FIG. 5) is provided in the middle of the rim water supply pipe 25. Thereby, when the water supply control valve 19 side becomes negative pressure, it is possible to prevent water from flowing back from the side of the flush toilet body 2 to the water supply control valve 19. Furthermore, a branch portion 25a is provided in the rim water supply pipe 25 on the downstream side of the vacuum breaker 31, and a part of the washing water flowing through the rim water supply pipe 25 flows into the down pipe 25b, and the remaining washing water is discharged from the rim water discharge port 2d.

[0047] The water supply control valve 19 includes a water supply valve main body portion 19a, a main valve body 19b disposed in the water supply valve main body portion 19a, and a pilot valve port 19c (FIG. 10). Further, as will be described later, the pilot valve port 19c provided in the water supply control valve 19 is configured to be opened and closed by the water supply valve drive mechanism 16. That is, the water supply valve drive mechanism 16 is configured to control the pressure in the pressure chamber 19d (FIG. 10) provided in the water supply valve main body portion 19a by opening and closing the pilot valve port 19c provided in the water supply valve main body portion 19a.

[0048] Next, with reference to FIGS. 6 to 11 newly, the configurations of the water supply valve drive mechanism 16, the biasing mechanism 17, the holding mechanism 20, and the delayed valve opening mechanism 21 will be described. FIG. 6 is a perspective view showing a part of the water supply valve drive mechanism 16 and the delayed valve opening mechanism 21. FIG. 7 is a side view showing the water supply valve drive mechanism 16 enlarged. FIG. 8 is a rear view showing the holding mechanism 20 and the delayed valve opening mechanism 21 enlarged. FIG. 9 is a schematic diagram for explaining the operation of the holding mechanism 20 and the delayed valve opening mechanism 21. FIG. 10 is a cross-sectional view showing the internal structure of the water supply control valve 19. FIG. 11 is a cross-sectional view showing the internal structure of the drain valve control valve 18.

[0049] As shown in FIGS. 6 and 7, the water supply valve drive mechanism 16 is composed of a drive arm member 16a curved in an L shape and a support portion 16b that rotatably supports the drive arm member 16a. The drive arm member 16a is rotatably supported about the support portion 16b and is configured to move between a stop position shown by a solid line in FIG. 7 and a discharge position shown by an imaginary line. Further, as shown in FIG. 10, a pilot valve portion 16c for opening and closing a pilot valve port 19c of the water supply control valve 19 is provided on the drive arm member 16a. When the drive arm member 16a is moved to the stop position, the pilot valve port 19c is closed by the pilot valve portion 16c, and when it is moved to the discharge position, the pilot valve port 19c is opened. The pilot valve port 19c communicates with a pressure chamber 19d in a water supply valve main body portion 19a of the water supply control valve 19.

[0050] That is, when the drive arm member 16a is moved to the stop position, the pilot valve port 19c is closed by the pilot valve portion 16c of the drive arm member 16a. As a result, the pressure in the pressure chamber 19d of the water supply control valve 19 increases, and the main valve body 19b of the water supply control valve 19 is closed. On the other hand, when the drive arm member 16a is moved to the discharge position, the pilot valve port 19c is opened. Thus, the pressure in the pressure chamber 19d decreases, and the main valve body 19b is opened. Further, the drive arm member 16a of the water supply valve drive mechanism 16 is moved from the stop position to the discharge position when the user operates the lever handle 8 (Fig. 3). Thereby, the pilot valve port 19c is opened, the main valve body 19b of the water supply control valve 19 is opened, and the water discharge from the rim water discharge port 2d is started. Note that the lever handle 8 and the drive arm member 16a are connected by a wire (not shown).

[0051] As shown in Figs. 3 and 5, the biasing mechanism 17 is provided in the water storage tank 10 and includes a small tank 17a that stores washing water, a biasing float 17b disposed in the small tank 17a, and a biasing rod 17c that extends upward from the biasing float 17b. The small tank 17a is a small tank provided inside the water storage tank 10 and is always filled with water regardless of the water level in the water storage tank 10. The biasing float 17b is a float disposed in a state of being submerged in the small tank 17a and is configured to always receive buoyancy from the washing water stored in the small tank 17a and generate an upward biasing force regardless of the water level in the water storage tank 10. The biasing rod 17c is a rod-shaped member that extends upward from the upper portion of the biasing float 17b. The upper end portion of the biasing rod 17c is connected to one end portion of the drive arm member 16a of the water supply valve drive mechanism 16 as shown in Fig. 7. Thereby, one end portion of the drive arm member 16a is biased upward, and as a result, the drive arm member 16a is biased toward its stop position.

[0052] In addition, in the present embodiment, the biasing mechanism 17 has a small tank 17a and a biasing float 17b, and generates a biasing force by the buoyancy acting on the biasing float 17b. On the other hand, as a modification, the biasing mechanism 17 can be configured such that a biasing force is generated by an elastic member such as a coil spring.

[0053] As shown in FIGS. 7 and 8, the holding mechanism 20 includes a holding mechanism main body 20a, an engaging member 20b attached to the holding mechanism main body 20a, and an engaging receiving member 20c that engages with the engaging member 20b. The holding mechanism main body 20a is attached to the upper end of the biasing rod 17c of the biasing mechanism 17 and is configured to move in the vertical direction together with the biasing rod 17c. The engaging member 20b is a member movably attached to the holding mechanism main body 20a, and moves between an engaging position (column (c) in FIG. 9) protruding toward the engaging receiving member 20c and a disengaged position (column (e) in FIG. 9) where it does not engage with the engaging receiving member 20c. Further, the engaging member 20b is biased toward the engaging position by a spring 20d (FIG. 9), which is an elastic member. Furthermore, an inclined surface 20e inclined with respect to the moving direction (vertical direction) of the holding mechanism main body 20a is provided at the tip of the engaging member 20b.

[0054] The engagement receiving member 20c is a plate-shaped member fixed at a position facing the holding mechanism main body 20a, and is provided with an opening 20f for receiving the engagement member 20b. When the user operates the lever handle 8, the drive arm member 16a is rotated about the support portion 16b. As shown in column (a) of FIG. 9, the biasing rod 17c and the holding mechanism main body 20a attached thereto are pushed down. When the holding mechanism main body 20a is pushed down, the inclined surface 20e of the engagement member 20b protruding from the holding mechanism main body 20a abuts against the upper end of the engagement receiving member 20c disposed opposite to the holding mechanism main body 20a. When the holding mechanism main body 20a is further pushed down, as shown in column (b) of FIG. 9, the inclined surface 20e of the engagement member 20b slides on the upper end of the engagement receiving member 20c, and the tip of the engagement member 20b retreats toward the holding mechanism main body 20a. That is, the engagement member 20b is moved from the engaged position toward the disengaged position against the biasing force of the spring 20d by sliding on the engagement receiving member 20c.

[0055] When the holding mechanism main body 20a is further pushed down and the drive arm member 16a is moved to the discharge position, the engagement member 20b is moved to a position that aligns with the opening 20f provided in the engagement receiving member 20c. When the opening 20f of the engagement member 20b and the engagement receiving member 20c are aligned, as shown in column (c) of FIG. 9, due to the biasing force of the spring 20d, the engagement member 20b protrudes into the opening 20f of the engagement receiving member 20c. That is, the engagement member 20b is moved from the disengaged position to the engaged position, and the engagement member 20b and the engagement receiving member 20c are engaged. In this state, the holding mechanism main body 20a holds its position against the biasing force of the biasing mechanism 17. As a result, the drive arm member 16a is held at the discharge position against the biasing force of the biasing mechanism 17.

[0056] Next, the configuration of the delay valve opening mechanism 21 will be described. As shown in Fig. 5, the delay valve opening mechanism 21 includes a transmission arm member 21a which is a second on-off valve drive mechanism generally formed in a gate shape, a support portion 21b that rotatably supports the transmission arm member 21a, a water receiving portion 21c attached to one end of the transmission arm member 21a, a balance float 21d provided below the water receiving portion 21c, and a connecting portion 21e (Fig. 3) that connects the water receiving portion 21c and the balance float 21d.

[0057] The transmission arm member 21a is rotatably supported about the support portion 21b and is configured to move between an open valve position shown by a solid line in Fig. 8 and a closed valve position shown by an imaginary line. Also, as shown in Fig. 11, a pilot valve 21f provided on the transmission arm member 21a forms a part of the drain valve control valve 18 and functions to open and close a pilot valve port 18c. The pilot valve port 18c communicates with a pressure chamber 18d in the control valve main body portion 18a. Therefore, when the transmission arm member 21a is moved to the open valve position, the pilot valve port 18c is opened, and as a result, the pressure in the pressure chamber 18d of the drain valve control valve 18 decreases, so that the main valve body 18b of the drain valve control valve 18 is opened.

[0058] Also, as shown in Fig. 8, the transmission arm member 21a extends to the back side of the engagement receiving member 20c, and the release end portion 21g of the transmission arm member 21a is positioned to face the engagement member 20b with the engagement receiving member 20c interposed therebetween. For this reason, when the transmission arm member 21a is moved from the closed valve position shown in column (d) of Fig. 9 to the open valve position shown in column (e) of Fig. 9, the tip portion of the engagement member 20b received in the opening 20f of the engagement receiving member 20c is pushed out by the release end portion 21g of the transmission arm member 21a. Thereby, the engagement between the engagement member 20b and the engagement receiving member 20c is released.

[0059] On the other hand, as shown in Fig. 5, a water receiving portion 21c is connected to the other end of the transmission arm member 21a. The water receiving part 21c is a cup-shaped member with an open top. The water receiving part 21c is configured such that the cleaning water branched from the rim water supply pipe 25 at the branch part 25a and flowing into the down pipe 25b flows in. Further, a discharge hole 21h is provided at the bottom of the water receiving part 21c, and the cleaning water flowing into the water receiving part 21c is discharged into the water storage tank 10 from this discharge hole 21h. Here, the flow rate of the cleaning water flowing from the down pipe 25b into the water receiving part 21c is larger than the flow rate of the cleaning water flowing out from the discharge hole 21h, and in a state where the cleaning water is flowing in from the down pipe 25b, the water level of the cleaning water in the water receiving part 21c rises.

[0060] The balance float 21d is a float attached below the water receiving part 21c via a connecting part 21e. The balance float 21d is configured to receive buoyancy from the cleaning water stored in the water storage tank 10 and push the water receiving part 21c upward. When no cleaning water is stored in the water receiving part 21c, the water receiving part 21c is in a state of being pushed upward by the buoyancy received by the balance float 21d. In this state, the transmission arm member 21a connected to the water receiving part 21c is moved to the valve closing position.

[0061] On the other hand, when the cleaning water flows from the down pipe 25b into the water receiving part 21c, the weight of the water receiving part 21c increases, and the balance float 21d is pushed down by the water receiving part 21c. When the weight of the water receiving part 21c increases due to the inflow of the cleaning water into the water receiving part 21c and overcomes the buoyancy acting on the balance float 21d, the transmission arm member 21a is moved to the valve opening position. When the transmission arm member 21a is moved to the valve opening position, the pilot valve port 18c is opened, and thereby, the main valve body 18b of the drain valve control valve 18 is opened.

[0062] Note that the water receiving part 21c is connected to the balance float 21d with a space therebetween above the balance float 21d via the connecting part 21e. Therefore, even when washing water flows in and the position of the water receiving part 21c drops, the water receiving part 21c still remains above the water stop level L1 in the water storage tank 10. For this reason, the water receiving part 21c itself does not receive buoyancy from the washing water in the water storage tank 10, and the water receiving part 21c can effectively push down the balance float 21d when washing water flows in.

[0063] Next, with reference to FIG. 12 newly, the operation of the washing water tank device 4 according to the first embodiment of the present invention and the flushing toilet device 1 equipped with the same will be described. FIG. 12 is a time chart showing an example of a washing sequence by the washing water tank device 4 according to the first embodiment of the present invention.

[0064] First, in the standby state of toilet washing at time t0 in FIG. 12, the water level in the water storage tank 10 is at the water stop level L1. In this state, the drive arm member 16a of the water supply valve drive mechanism 16 is at the stop position, and the transmission arm member 21a of the delay valve opening mechanism 21 is at the valve closing position. As a result, the pilot valve port 19c of the water supply control valve 19 and the pilot valve port 18c of the drain valve control valve 18 are each in the valve closed state. For this reason, the main valve body 19b of the water supply control valve 19 is in the valve closed state, and the main valve body 18b of the drain valve control valve 18 is also in the valve closed state.

[0065] Next, when the user operates the lever handle 8 (Fig. 1) at time t1 in Fig. 12, the drive arm member 16a of the water supply valve drive mechanism 16 is moved to the discharge position in conjunction therewith. When the drive arm member 16a is moved to the discharge position, the holding mechanism main body portion 20a of the holding mechanism 20 and the biasing rod 17c of the biasing mechanism 17, which are connected to the drive arm member 16a, are also pushed downward. Further, when the holding mechanism main body portion 20a is pushed downward, the inclined surface 20e at the tip of the engaging member 20b of the holding mechanism 20 abuts against the upper end of the engagement receiving member 20c, and the engaging member 20b retreats to the disengaged position (see the (b) column of Fig. 9). Furthermore, when the drive arm member 16a is moved to the discharge position, the engaging member 20b is aligned with the opening 20f of the engagement receiving member 20c, and the engaging member 20b protrudes into the opening 20f (see the (c) column of Fig. 9). Thereby, the engaging member 20b and the engagement receiving member 20c are engaged with each other.

[0066] On the other hand, the biasing mechanism 17 biases the holding mechanism main body portion 20a upward by the buoyancy acting on the biasing float 17b. However, when the engaging member 20b is engaged with the engagement receiving member 20c, the holding mechanism main body portion 20a is held at the pushed-down position. In this way, the holding mechanism 20 holds the drive arm member 16a of the water supply valve drive mechanism 16 moved to the discharge position against the biasing force of the biasing mechanism 17 by the engagement of the engaging member 20b with the engagement receiving member 20c.

[0067] When the drive arm member 16a of the water supply valve drive mechanism 16 is moved to the discharge position, the pilot valve port 19c (Fig. 10) of the water supply control valve 19 is opened. As a result, the pressure in the pressure chamber 19d of the water supply valve main body 19a decreases, and the main valve body 19b separates from the valve seat and opens. When the water supply control valve 19 is opened, the tap water supplied to the water supply control valve 19 from the water supply pipe 32 via the water supply pipe branch portion 33 and the second branch pipe 33b flows into the rim water supply pipe 25 through the water supply control valve 19. The washing water that has flowed into the rim water supply pipe 25 is discharged from the rim discharge port 2d (Fig. 2) of the water washing toilet body 2, and the washing of the bowl portion 2a is started with the rim washing water as the "front rim" discharge before the discharge from the jet discharge port 2b starts. Also, a part of the washing water that has flowed into the rim water supply pipe 25 flows into the downcomer 25b (Fig. 5), and the flowing-in washing water flows into the water receiving portion 21c of the delayed opening valve mechanism 21 disposed below the downcomer 25b. That is, the washing water flowing out from the water supply control valve 19 is branched and supplied to the rim discharge port 2d and the water receiving portion 21c of the delayed opening valve mechanism 21, respectively.

[0068] After the discharge from the rim discharge port 2d starts, at time t2 in Fig. 12, when the washing water that has flowed in from the downcomer 25b and accumulated in the water receiving portion 21c exceeds a predetermined amount, the gravity acting on the water receiving portion 21c overcomes the buoyancy acting on the balance float 21d, and the water receiving portion 21c descends. When the water receiving portion 21c descends, the transmission arm member 21a connected thereto is rotated about the support portion 21b, and the transmission arm member 21a is moved from the closed valve position to the open valve position. When the transmission arm member 21a is moved to the open valve position, the pilot valve port 18c (Fig. 11) of the drain valve control valve 18 is opened, so the pressure in the pressure chamber 18d of the control valve main body 18a decreases, and the main valve body 18b is opened. That is, after the water supply control valve 19 is opened, the drain valve control valve 18 is opened while the open state of the water supply control valve 19 is maintained. Also, as will be described later, when the transmission arm member 21a is moved to the open valve position, the holding of the drive arm member 16a by the holding mechanism 20 is released.

[0069] When the drain valve control valve 18 is opened, the tap water supplied from the water supply pipe 32 to the drain valve control valve 18 via the water supply pipe branch portion 33 and the first branch pipe 33a flows into the inflow pipe 23 (Fig. 5) through the drain valve control valve 18. Further, the cleaning water flowing into the inflow pipe 23 flows into the cylinder 14a of the drain valve hydraulic drive unit 14 and pushes up the piston 14b (Fig. 4). As a result, the rod 15 and the drain valve 12 connected to the piston 14b are also pulled up, and the drain port 10a is opened.

[0070] In this way, after the water discharge from the rim water discharge port 2d is started, the delay opening mechanism 21 opens the drain valve control valve 18 with a predetermined time delay and supplies the cleaning water to the drain valve hydraulic drive unit 14. Also, for the opening of the drain valve control valve 18, a part of the cleaning water that has flowed from the downcomer 25b into the water receiving portion 21c, that is, the cleaning water introduced through the water supply control valve 19, is used. Further, the drain valve control valve 18 functions as a control valve for opening the drain valve 12.

[0071] When the drain port 10a is opened, the cleaning water stored in the water storage tank 10 flows out through the drain port 10a and is discharged as "jet water discharge" from the jet water discharge port 2b (Fig. 2) provided at the lower part of the bowl portion 2a. The cleaning water discharged from the jet water discharge port 2b fills the drain trap pipe line 2e extending from the lower part of the bowl portion 2a and induces a siphon phenomenon. Due to the siphon phenomenon, the accumulated water and dirt in the bowl portion 2a are discharged through the drain trap pipe line 2e. In this way, even while the cleaning water is being discharged from the jet water discharge port 2b, the water discharge from the rim water discharge port 2d also continues as "mid-rim" water discharge. For this reason, when the drain port 10a is opened, the cleaning water is discharged simultaneously from both the rim water discharge port 2d and the jet water discharge port 2b.

[0072] As described above, in the flushing toilet device 1 of the present embodiment, while the siphon phenomenon is occurring due to the washing water discharged from the jet outlet 2b, the supply of the washing water from the rim outlet 2d is continued. For this reason, it is possible to suppress the excessive decrease in the stored water in the bowl portion 2a due to the siphon phenomenon drawing in the stored water, and to prevent the water seal in the drain trap pipe 2e from being interrupted. If the water seal in the drain trap pipe 2e is interrupted, there is a risk of odor flowing back from the drain trap pipe 2e, but in the present embodiment, this can be suppressed. Further, since the supply of the washing water from the rim outlet 2d is continued even while the siphon phenomenon is occurring, the water seal is not interrupted, the siphon phenomenon can be continued, and it is possible to suppress the siphon phenomenon from ending halfway.

[0073] On the other hand, when the piston 14b is pushed up in the drain valve hydraulic drive unit 14 and, accordingly, the rod 15 and the drain valve 12 are pulled up to a predetermined position, the clutch mechanism 22 disconnects the lower rod 15b and the drain valve 12 from the upper rod 15a. As a result, while the drain valve control valve 18 is open, the upper rod 15a remains pushed upward together with the piston 14b, while the lower rod 15b and the drain valve 12 descend due to their own weight. However, the separated lower rod 15b engages with the engaging portion 26b of the drain valve float mechanism 26, and the descent of the lower rod 15b and the drain valve 12 is blocked. As a result, even after the clutch mechanism 22 is disengaged, the drain port 10a of the water storage tank 10 remains open, and the drainage from the water storage tank 10 continues.

[0074] Further, when cleaning water flows from the inflow pipe 23 into the cylinder 14a of the drain valve hydraulic drive unit 14 and the piston 14b is pushed up to the upper part of the cylinder 14a, the cleaning water in the cylinder 14a flows out through the outflow pipe 24 (Fig. 5). Also, a part of the water flowing from the inflow pipe 23 into the cylinder 14a flows out from the gap 14d (Fig. 4) between the inner wall of the through hole 14f of the cylinder 14a and the rod 15, and this water flows into the water storage tank 10. On the other hand, a part of the cleaning water flowing out through the outflow pipe 24 flows into the overflow pipe 10b, and the remaining cleaning water flows into the water storage tank 10. That is, a part of the cleaning water flowing out from the drain valve hydraulic drive unit 14 flows into the water storage tank 10, and the remaining cleaning water flowing into the overflow pipe 10b bypasses the drain valve 12 and flows into the inside of the water closet main body from the jet outlet 2b. Note that the flow rate of the cleaning water flowing into the water storage tank 10 through the outflow pipe 24 is less than the flow rate of the cleaning water discharged from the drain port 10a when the drain valve 12 is opened. Therefore, in this state, the water level in the water storage tank 10 drops.

[0075] On one hand, when the transmission arm member 21a is moved to the valve opening position, the release end portion 21g (FIG. 8) of the transmission arm member 21a presses back the engaging member 20b that faces the engaging receiving member 20c of the holding mechanism 20 with the engaging receiving member 20c therebetween (from the column (d) to the column (e) in FIG. 9), releasing the engagement between the engaging member 20b and the engaging receiving member 20c. When the engagement between the engaging member 20b and the engaging receiving member 20c is released, the holding mechanism main body portion 20a of the holding mechanism 20 is moved upward by the biasing force of the biasing mechanism 17. That is, the biasing float 17b of the biasing mechanism 17 receives buoyancy from the washing water stored in the small tank 17a and moves the biasing rod 17c attached to the biasing float 17b upward. Thereby, the holding mechanism main body portion 20a and the drive arm member 16a connected to the biasing rod 17c are moved. In this way, the delay valve opening mechanism 21 uses the weight of the washing water that has flowed out from the water supply control valve 19 and accumulated in the water receiving portion 21c to release the holding state of the drive arm member 16a of the water supply valve drive mechanism 16. That is, the delay valve opening mechanism 21 releases the holding of the drive arm member 16a based on the amount of the washing water that has flowed out from the water supply control valve 19. As a result, the drive arm member 16a of the water supply valve drive mechanism 16 begins to move from the discharge position to the stop position. Also, the biasing force by the biasing mechanism 17 is relatively weak, and after the engagement between the engaging member 20b and the engaging receiving member 20c is released, the biasing rod 17c rises gently.

[0076] Next, when the washing water in the water storage tank 10 is discharged from the drain port 10a and the water level in the water storage tank 10 drops to a predetermined water level, the float portion 26a of the drain valve float mechanism 26 descends, which moves the engaging portion 26b. Thereby, the engagement between the lower rod 15b and the engaging portion 26b is released, and the lower rod 15b and the drain valve 12 begin to descend again. Then, at the time t3 in FIG. 12, the drain port 10a of the water storage tank 10 is closed by the drain valve 12, and the water discharge from the drain port 10a to the jet water discharge port 2b of the washing water that has flowed out is stopped.

[0077] Furthermore, even after the drain outlet 10a is closed, the drain valve control valve 18 remains open. Therefore, the water supplied from the water supply pipe 32 flows into the drain valve hydraulic driving unit 14 and then flows out to the outflow pipe 24 (Fig. 5). Most of the washing water flowing out from the outflow pipe 24 flows into the water storage tank 10 through the second downcomer 24c, thus raising the water level in the water storage tank 10. Also, a part of the remaining washing water flowing out from the outflow pipe 24 flows into the overflow pipe 10b through the first downcomer 24b. Therefore, even after the drain outlet 10a is closed, the washing water flowing into the overflow pipe 10b flows into the bowl portion 2a at a small flow rate through the jet outlet 2b, and the flowing-in washing water is used as refill water.

[0078] Furthermore, after the water discharge from the jet outlet 2b stops at time t3 in Fig. 12, at time t4, the drive arm member 16a of the water supply valve driving mechanism 16 that has been moved by the biasing rod 17c of the biasing mechanism 17 reaches the stop position. When the drive arm member 16a reaches the stop position, the pilot valve port 19c (Fig. 10) of the water supply control valve 19 is closed. As a result, the main valve body 19b of the water supply control valve 19 is closed, and the water discharge from the rim outlet 2d of the toilet bowl body 2 stops. Note that after the jet water discharge ends, water is discharged from the rim outlet 2d as "post-rim" water discharge, and the washing water discharged from this rim outlet 2d also flows into the bowl portion 2a and is used as refill water. Also, even after the water supply control valve 19 is closed, the drain valve control valve 18 remains open, and the washing water flowing from the first downcomer 24b into the overflow pipe 10b through the drain valve hydraulic driving unit 14 is used for the refill of the bowl portion 2a.

[0079] In this embodiment, a part of the remaining washing water flowing out from the outflow pipe 24 flows into the overflow pipe 10b through the first downcomer 24b and is used for the refill of the bowl portion 2a. On the contrary, as a modification, for example, the water discharge time from the rim outlet 2d of the toilet bowl body 2 can be adjusted, and the washing water discharged from the rim outlet 2d after the jet water discharge ends can also be used for the refill of the bowl portion 2a.

[0080] On the other hand, when the water supply control valve 19 is closed, the cleaning water flowing into the water receiving part 21c of the delay valve opening mechanism 21 through the downcomer 25b branched from the rim water supply pipe 25 (Fig. 5) also stops. Further, as described above, the water receiving part 21c is provided with a discharge hole 21h (Fig. 5), and the cleaning water flowing into the water receiving part 21c is discharged into the water storage tank 10 from this discharge hole 21h. Therefore, when the inflow of the cleaning water from the downcomer 25b stops, the amount of the cleaning water stored in the water receiving part 21c gradually decreases.

[0081] At time t5 in Fig. 12, when the amount of the cleaning water in the water receiving part 21c decreases to a predetermined amount, the water receiving part 21c rises due to the buoyancy acting on the balance float 21d. As a result, the transmission arm member 21a (Fig. 5) connected to the water receiving part 21c is rotated from the valve opening position to the valve closing position around the support part 21b. When the transmission arm member 21a is moved to the valve closing position, the pilot valve port 18c (Fig. 11) of the drain valve control valve 18 is closed. Thereby, the pressure in the pressure chamber 18d of the control valve main body part 18a rises to close the main valve body 18b, and the drain valve control valve 18 becomes a closed state. As described above, the water supply to the water storage tank 10 is stopped. At this time, the water level in the water storage tank 10 becomes the water stop level L1.

[0082] On the other hand, when the supply of water to the drain valve hydraulic drive part 14 stops due to the closing of the drain valve control valve 18, the piston 14b (Fig. 4) of the drain valve hydraulic drive part 14 is pushed down by the biasing force of the spring 14c. When the upper rod 15a is pushed down together with the piston 14b, the upper rod 15a and the lower rod 15b that were separated by the clutch mechanism 22 are connected again. Therefore, the next time the toilet is cleaned, the upper rod 15a and the lower rod 15b are both pulled up by the piston 14b. As described above, one toilet cleaning is completed, and the toilet washing device 1 returns to the standby state for toilet cleaning.

[0083] According to the cleaning water tank device 4 of the first embodiment of the present invention, since the drain valve hydraulic pressure driving unit 14 drives the drain valve 12 by the water supply pressure of the cleaning water supplied from the water supply C which is the water supply source, the drain valve 12 can be driven with sufficient driving force. Also, since the delay valve opening mechanism 21 supplies cleaning water to the drain valve hydraulic pressure driving unit 14 after a predetermined time delay after the water discharge from the rim water discharge port 2d is started to open the drain valve 12, after the start of water discharge from the rim water discharge port 2d, the water discharge from the jet water discharge port 2b can be started after a delay, and the water washing toilet body 2 can be effectively washed.

[0084] Also, according to the cleaning water tank device 4 of the present embodiment, the transmission arm member 21a which is the second on-off valve driving mechanism opens the drain valve control valve 18 when the weight of the water receiving portion 21c increases due to the inflow of cleaning water and overcomes the buoyancy acting on the balance float 21d, and as a result, the drain valve 12 is opened. Therefore, the time until the drain valve control valve 18 is opened can be freely set according to the configurations of the water receiving portion 21c and the balance float 21d. Also, by designing the buoyancy acting on the balance float 21d to be small, the water receiving portion 21c can also be miniaturized.

[0085] Furthermore, according to the cleaning water tank device 4 of the present embodiment, by the design of the branch portion 25a provided in the rim water supply pipe 25 which is the water discharge port water supply pipe, the flow rate of the cleaning water flowing into the water receiving portion 21c can be freely set, and the delay time until the drain valve 12 is opened can be freely set.

[0086] Also, according to the cleaning water tank device 4 of the present embodiment, the water receiving portion 21c is provided with a discharge hole 21h for discharging the cleaning water in the water receiving portion 21c at a flow rate less than the flow rate of the inflowing cleaning water. Therefore, while the cleaning water is flowing in, the weight of the water receiving portion 21c increases and can overcome the buoyancy acting on the balance float 21d. Also, after the inflow of the cleaning water stops, the cleaning water in the water receiving portion 21c is discharged and can be automatically restored to the initial state.

[0087] Furthermore, according to the washing water tank device 4 of the present embodiment, since the water receiving portion 21c is disposed above the water surface of the water storage tank 10 at the water stop water level L1, buoyancy does not act on the water receiving portion 21c itself, and the weight of the washing water accumulated in the water receiving portion 21c can be effectively utilized.

[0088] Also, according to the washing water tank device 4 of the present embodiment, since the water receiving portion 21c and the balance float 21d are connected with a space therebetween by the connecting portion 21e, the positional relationship between the water receiving portion 21c and the balance float 21d can be freely designed.

[0089] Furthermore, according to the washing water tank device 4 of the present embodiment, the transmission arm member 21a opens and closes the pilot valve 21f of the drain valve control valve 18 based on the gravity acting on the water receiving portion 21c and the buoyancy acting on the balance float 21d. Therefore, the drain valve control valve 18 can be opened and closed with a small force acting on the water receiving portion 21c and the balance float 21d. For this reason, the degree of freedom in the design of the water receiving portion 21c and the balance float 21d can be increased.

[0090] Next, with reference to FIGS. 13 to 15, a washing water tank device according to a second embodiment of the present invention will be described. The mechanism for opening and closing the water supply control valve of the washing water tank device of the present embodiment is different from that of the first embodiment of the present invention described above. Therefore, here, only the parts different from the first embodiment of the present invention in the second embodiment of the present invention will be described, and for the same configurations, the same reference numerals as those in the first embodiment will be given and the description will be omitted. Also, the description of the same operations and effects as those in the first embodiment of the present invention in the second embodiment of the present invention will be omitted.

[0091] FIG. 13 is a cross-sectional view showing a schematic configuration of a washing water tank device according to a second embodiment of the present invention. FIG. 14 is a cross-sectional view showing an internal structure of the water supply control valve. FIG. 15 is a cross-sectional view showing an internal structure of the drain valve control valve.

[0092] As shown in FIG. 13, the washing water tank device 104 according to the second embodiment of the present invention includes a solenoid valve 117 that opens and closes a water supply control valve 119, which is a first on-off valve, based on an operation of a remote controller 106 by a user, and a manual valve opening mechanism 116 that opens the water supply control valve 119 based on a manual operation by the user during a power failure. Further, the washing water tank device 104 includes a drain valve control valve 118, which is a second on-off valve that controls the water supply to the drain valve hydraulic drive unit 14, and a delay valve opening mechanism 121 that uses a part of the washing water introduced through the water supply control valve 119 to open the drain valve control valve 118 with a predetermined time delay after the water discharge from the rim water discharge port 2d is started, and supplies the washing water to the drain valve hydraulic drive unit 14.

[0093] As shown in FIG. 14, the water supply control valve 119 includes a water supply valve main body portion 119a, a main valve body 119b disposed in the water supply valve main body portion 119a, a pressure chamber 119d formed adjacent to the main valve body 119b, and a pilot valve port 119c communicating with the pressure chamber 119d. Further, a solenoid valve 117 is attached to the water supply control valve 119, and the pilot valve port 119c of the water supply control valve 119 is opened and closed by the solenoid valve 117. By opening and closing the pilot valve port 119c, the pressure in the pressure chamber 119d is controlled, and the main valve body 119b of the water supply control valve 119 is opened or closed.

[0094] The solenoid valve 117 includes a drive coil 117a, a plunger 117b driven by the drive coil 117a, and a pilot valve body 117c attached to the plunger 117b. When the user performs a washing operation using the remote controller 106, a current flows through the drive coil 117a of the solenoid valve 117, and the plunger 117b is retracted. As a result, the pilot valve body 117c attached to the plunger 117b is separated from the pilot valve port 119c, and the pilot valve port 119c is opened. As a result, the pressure in the pressure chamber 119d of the water supply control valve 119 decreases, and the main valve body 119b is opened.

[0095] In this embodiment, a latching solenoid is employed as the solenoid valve 117, and the plunger 117b remains in the retracted state even when the current flowing through the drive coil 117a is stopped. Further, by flowing a current in the reverse direction through the drive coil 117a, the plunger 117b moves forward, and the pilot valve body 117c closes the pilot valve port 119c.

[0096] Furthermore, a manual valve opening mechanism 116 is attached to the water supply control valve 119. In the event of a power outage, the user can manually open the water supply control valve 119 using the manual valve opening mechanism 116. The manual valve opening mechanism 116 includes a movable member 116a, a pilot valve body 116b attached to the movable member 116a, a coil spring 116c that biases the pilot valve body 116b toward the pilot valve port, and a wire 116d attached to the movable member 116a. A gripping ring 108 (FIG. 13), which is a manual operation part, is attached to the tip of the wire 116d. The configuration is such that the user can pull the wire 116d by holding the gripping ring 108 to retract the movable member 116a.

[0097] On the other hand, a pilot valve port 119e for power outage is provided in the water supply control valve 119. This pilot valve port 119e for power outage is normally closed by the pilot valve body 116b of the manual valve opening mechanism 116. In the event of a power outage or when the solenoid valve 117 does not operate, the user manually pulls the gripping ring 108 (FIG. 13) to retract the movable member 116a. As a result, the pilot valve port 119e for power outage, which was closed by the pilot valve body 116b, opens. Consequently, the pressure in the pressure chamber 119d of the water supply control valve 119 decreases, and the main valve body 119b opens. In this way, the water supply control valve 119 is configured such that its main valve body 119b opens by opening either the pilot valve port 119c or the pilot valve port 119e for power outage.

[0098] Next, as shown in FIG. 15, the drain valve control valve 118 includes a control valve main body portion 118a, a main valve body 118b disposed within the control valve main body portion 118a, a pressure chamber 118d formed adjacent to the main valve body 118b, and a pilot valve port 118c communicating with the pressure chamber 118d. Further, a delay valve opening mechanism 121 is attached to the drain valve control valve 118.

[0099] As shown in FIG. 13, the delay valve opening mechanism 121 includes a transmission arm member 121a which is a second on-off valve drive mechanism generally formed in an L-shape, a support portion 121b that rotatably supports the transmission arm member 121a, a water receiving portion 121c attached to one end of the transmission arm member 121a, a balance float 121d provided below the water receiving portion 121c, and a connecting portion 121e that connects the water receiving portion 121c and the balance float 121d.

[0100] The transmission arm member 121a is rotatably supported about the support portion 121b and is configured to move between an open valve position shown by a solid line and a closed valve position shown by an imaginary line in FIG. 15. Also, as shown in FIG. 15, a pilot valve 121f provided on the transmission arm member 121a forms a part of the drain valve control valve 118 and functions to open and close the pilot valve port 118c. The pilot valve port 118c communicates with the pressure chamber 118d within the control valve main body portion 118a. Therefore, when the transmission arm member 121a is moved to the open valve position, the pilot valve port 118c is opened, whereby the pressure within the pressure chamber 118d of the drain valve control valve 118 decreases, and thus the main valve body 118b of the drain valve control valve 118 is opened.

[0101] On the other hand, as shown in FIG. 13, a water receiving portion 121c is connected to the other end of the transmission arm member 121a. The water receiving part 121c is a cup-shaped member with an open top. The water receiving part 121c is configured such that the cleaning water branched from the rim water supply pipe 25 at the branch part 25a and flowing through the down pipe 25b flows into it. Further, a discharge hole (not shown) is provided at the bottom of the water receiving part 121c, and the cleaning water flowing into the water receiving part 121c is discharged into the water storage tank 10 through this discharge hole.

[0102] The balance float 121d is a float attached below the water receiving part 121c via the connecting part 121e. The balance float 121d is configured to receive buoyancy from the cleaning water stored in the water storage tank 10 and push the water receiving part 121c upward. When there is no cleaning water stored in the water receiving part 121c, the water receiving part 121c is in a state of being pushed upward by the buoyancy received by the balance float 121d. In this state, the transmission arm member 121a connected to the water receiving part 121c is moved to the valve-closed position.

[0103] On the other hand, when the cleaning water flows from the down pipe 25b into the water receiving part 121c, the weight of the water receiving part 121c increases, and the balance float 121d is pushed down by the water receiving part 121c. When the cleaning water flows into the water receiving part 121c and the weight of the water receiving part 121c increases to overcome the buoyancy acting on the balance float 121d, the transmission arm member 121a is moved to the valve-open position. When the transmission arm member 121a is moved to the valve-open position, the pilot valve port 118c is opened, and thereby, the main valve body 118b of the drain valve control valve 118 is opened.

[0104] Next, the operation of the cleaning water tank device 104 according to the second embodiment of the present invention will be described. First, in the standby state of the washing water tank device 104, the water level in the water storage tank 10 is at the water stop level L1. In this state, the pilot valve body 117c of the solenoid valve 117 closes the pilot valve port 119c of the water supply control valve 119, and the pilot valve body 116b of the manual valve opening mechanism 116 closes the pilot valve port 119e for power failure of the water supply control valve 119. Also, the pilot valve 121f of the delayed valve opening mechanism 121 closes the pilot valve port 118c of the drain valve control valve 118. Therefore, the main valve body 119b of the water supply control valve 119 is in a closed state, and the main valve body 118b of the drain valve control valve 118 is also in a closed state.

[0105] Next, when the user operates the remote control 106 (Fig. 13), the control unit (not shown) sends a control signal to the solenoid valve 117 to move the pilot valve body 117c and open the pilot valve port 119c. As a result, the main valve body 119b of the water supply control valve 119 is lifted off the valve seat and opened. When the water supply control valve 119 is opened, the tap water supplied from the water supply pipe 32 flows into the rim water supply pipe 25 through the water supply control valve 119. The washing water that has flowed into the rim water supply pipe 25 is discharged from the rim water discharge port 2d (Fig. 2) of the wash toilet body 2, and the washing of the bowl portion 2a is started by the rim washing water. Also, a part of the washing water that has flowed into the rim water supply pipe 25 flows into the down pipe 25b (Fig. 13), and the flowing-in washing water flows into the water receiving portion 121c of the delayed valve opening mechanism 121 disposed below the down pipe 25b. That is, the washing water flowing out from the water supply control valve 119 is branched and supplied to the rim water discharge port 2d and the water receiving portion 121c of the delayed valve opening mechanism 121, respectively.

[0106] After the water discharge from the rim water discharge port 2d starts, when the cleaning water that has flowed into the water receiving portion 121c from the downcomer 25b and accumulated in the water receiving portion 121c exceeds a predetermined amount, the gravity acting on the water receiving portion 121c overcomes the buoyancy acting on the balance float 121d, and the water receiving portion 121c descends. When the water receiving portion 121c descends, the transmission arm member 121a connected thereto is rotated about the support portion 121b, and the transmission arm member 121a is moved from the valve closed position (imaginary line in FIG. 15) to the valve open position (solid line in FIG. 15). As a result, the pilot valve port 118c (FIG. 15) of the drain valve control valve 118 is opened, so that the main valve body 18b is opened. That is, after the water supply control valve 119 is opened, the drain valve control valve 118 is opened while the open state of the water supply control valve 119 is maintained.

[0107] When the drain valve control valve 118 is opened, the tap water supplied from the water supply pipe 32 flows into the inflow pipe 23 (FIG. 13) through the drain valve control valve 118. Further, the cleaning water that has flowed into the inflow pipe 23 is supplied to the drain valve hydraulic drive unit 14 to lift the drain valve 12. As a result, the drain port 10a is opened.

[0108] In this way, the delay opening mechanism 121 opens the drain valve control valve 118 with a predetermined time delay after the water discharge from the rim water discharge port 2d starts, and supplies the cleaning water to the drain valve hydraulic drive unit 14. In addition, for the opening of the drain valve control valve 118, a part of the cleaning water that has flowed from the downcomer 25b into the water receiving portion 121c, that is, the cleaning water introduced through the water supply control valve 119 is used. Further, the drain valve control valve 118 functions as a control valve for opening the drain valve 12.

[0109] When the drain port 10a is opened, the cleaning water stored in the water storage tank 10 flows out through the drain port 10a and is discharged from the jet water discharge port 2b (FIG. 2) provided at the lower part of the bowl portion 2a. In this way, when the drain port 10a is opened, the cleaning water is discharged simultaneously from both the rim water discharge port 2d and the jet water discharge port 2b.

[0110] Also, the cleaning water supplied from the inflow pipe 23 to the drain valve hydraulic drive unit 14 flows out through the outflow pipe 24 (Fig. 13). A part of the outflowing cleaning water flows into the overflow pipe 10b, and the remaining cleaning water flows into the water storage tank 10.

[0111] Next, when the cleaning water in the water storage tank 10 is discharged from the drain port 10a and the water level in the water storage tank 10 drops to a predetermined level, the drain valve 12 begins to descend. Thereafter, the drain port 10a of the water storage tank 10 is closed by the drain valve 12, and the water discharge from the zero discharge port 2b of the cleaning water flowing out from the drain port 10a stops.

[0112] Furthermore, even after the drain port 10a is closed, since the drain valve control valve 118 is in the open state, the water supplied from the water supply pipe 32 flows into the drain valve hydraulic drive unit 14 and flows out to the outflow pipe 24 (Fig. 13). Most of the cleaning water flowing out from the outflow pipe 24 flows into the water storage tank 10 through the second down pipe 24c, thus raising the water level in the water storage tank 10. Also, a part of the remaining cleaning water flowing out from the outflow pipe 24 flows into the overflow pipe 10b through the first down pipe 24b.

[0113] Furthermore, after the water discharge from the zero discharge port 2b stops, the control unit (not shown) sends a control signal to the electromagnetic valve 117 to move the pilot valve body 117c and close the pilot valve port 119c. As a result, the main valve body 119b of the water supply control valve 119 seats on the valve seat, and the water supply control valve 119 is closed. That is, the control unit (not shown) sends a control signal to the electromagnetic valve 117 to open the water supply control valve 119, and then sends a control signal to the electromagnetic valve 117 again after a predetermined time to close the water supply control valve 119. When the water supply control valve 119 is closed, the water discharge from the rim discharge port 2d stops. Note that even after the water supply control valve 119 is closed, the drain valve control valve 118 remains in the open state.

[0114] On the one hand, when the water supply control valve 119 is closed, the cleaning water that flows into the water receiving part 121c of the delay valve opening mechanism 121 through the downcomer 25b branched from the rim water supply pipe 25 (Fig. 13) also stops. Also, as described above, a discharge hole (not shown) is provided in the water receiving part 121c, and the cleaning water that has flowed into the water receiving part 121c is discharged into the water storage tank 10 through this discharge hole. For this reason, when the inflow of the cleaning water from the downcomer 25b stops, the amount of the cleaning water stored in the water receiving part 121c gradually decreases.

[0115] When the amount of the cleaning water in the water receiving part 121c decreases to a predetermined amount, the water receiving part 121c rises due to the buoyancy acting on the balance float 121d. As a result, the transmission arm member 121a (Fig. 13) connected to the water receiving part 121c is rotated from the valve opening position to the valve closing position around the support part 121b. When the transmission arm member 121a is moved to the valve closing position, the pilot valve port 118c (Fig. 15) of the drain valve control valve 118 is closed. As a result, the drain valve control valve 118 is in the closed state. Thus, the water supply to the water storage tank 10 is stopped. Thus, one toilet cleaning is completed, and the toilet flushing device returns to the standby state for toilet cleaning.

[0116] On the other hand, when the solenoid valve 117 cannot be operated due to a power failure or the like, the user pulls the gripping ring 108 (Fig. 13) to retract the pilot valve body 116b (Fig. 14) of the manual valve opening mechanism 116. As a result, the pilot valve port 119e for power failure of the water supply control valve 119 is opened, the pressure in the pressure chamber 119d decreases, and the main valve body 119b is opened. As a result, the water discharge from the rim water discharge port 2d of the toilet flushing main body 2 is started. Thus, the operation of the cleaning water tank device 104 after the water supply control valve 119 is opened by the manual operation of the user is the same as when the water supply control valve 119 is opened by the solenoid valve 117.

[0117] That is, after the water supply control valve 119 is opened, the delayed opening mechanism 121 delays the opening of the drain valve control valve 118. When the drain valve control valve 118 is opened, the drain valve hydraulic drive unit 14 operates to open the drain valve 12, and the washing water stored in the water storage tank 10 is discharged from the jet outlet 2b of the toilet body 2. After the washing water is discharged from the jet outlet 2b, when the user stops pulling the grip ring 108, the pilot valve body 116b closes the power failure pilot valve port 119e of the water supply control valve 119 by the biasing force of the coil spring 116c (FIG. 14) of the manual opening mechanism 116. As a result, the pressure in the pressure chamber 119d of the water supply control valve 119 increases, and the main valve body 119b closes. Thereafter, the drain valve 12 closes, and the pilot valve 121f (FIG. 15) of the delayed opening mechanism 121 closes the pilot valve port 118c of the drain valve control valve 118. As a result, the drain valve control valve 118 closes, and the washing water tank device 104 returns to the standby state.

[0118] According to the washing water tank device 104 of the second embodiment of the present invention, by simply opening the water supply control valve 119 with the solenoid valve 117, the drain valve control valve 118 can be opened after a delay, and the drain valve 12 can be opened by the drain valve hydraulic drive unit 14. Further, when the water supply control valve 119 cannot be opened by the solenoid valve 117 due to a power failure or the like, the user can open the water supply control valve 119 by simply manually operating the grip ring 108. Further, even in this case, the drain valve control valve 118 can be opened after a delay, and the drain valve 12 can be opened.

[0119] The embodiments of the present invention have been described above, but various modifications can be made to the above-described embodiments. For example, in the above-described embodiments, the rim water discharge port 2d for discharging washing water along the wall surface of the rim portion 2c at the upper end of the bowl portion 2a was provided as the upper water discharge port. However, various water discharge ports provided above the water storage surface W of the flush toilet body 2 can be used as the upper water discharge port. Further, in the above-described embodiments, the jet water discharge port 2b provided so as to face the entrance of the drain trap pipe line 2e at the bottom of the bowl portion 2a was provided as the lower water discharge port. However, various water discharge ports provided below the water storage surface W of the flush toilet body 2 can be used as the lower water discharge port.

[0120] Also, in the above-described embodiments of the present invention, the delay valve opening mechanism includes a water receiving portion and a balance float, and the weight of the water receiving portion overcomes the buoyancy of the balance float to operate the transmission arm member which is the second on-off valve drive mechanism. In contrast, as a modification, the delay valve opening mechanism may not include a balance float. That is, the water receiving portion is supported so as to be rotatable about a predetermined axis, and when a predetermined amount or more of washing water accumulates in the water receiving portion, the water receiving portion is rotated about the axis, and the present invention can also be configured such that the transmission arm member is operated. In addition to this configuration, after the water discharge from the rim water discharge port is started by using a part of the washing water introduced through the water supply control valve, the drain valve control valve is opened with a predetermined time delay, and an arbitrary mechanism for supplying the washing water to the drain valve hydraulic drive portion can be used as the delay valve opening mechanism.

Explanation of Reference Numerals

[0121] 1 Flush toilet device 2 Flush toilet body 2a Bowl portion 2b Jet water discharge port (lower water discharge port) 2c Rim portion 2d Rim water discharge port (upper water discharge port) 2e Drain trap pipe line 4 Washing water tank device 8 Lever handle 10 Water storage tank (washing water tank body) 10a Drain port 10b overflow pipe 12 drain valve 14 drain valve hydraulic drive unit (hydraulic drive mechanism) 14a cylinder 14b piston 14c spring 14d gap 14e packing 14f through-hole 14g frame 15 rod 15a upper rod 15b lower rod 16 water supply valve drive mechanism (first on-off valve drive mechanism) 16a drive arm member 16b support part 16c pilot valve part 17 biasing mechanism 17a small tank 17b biasing float 17c biasing rod 18 drain valve control valve (second on-off valve) 18a control valve body part 18b main valve body (diaphragm valve) 18c pilot valve port 18d pressure chamber 19 water supply control valve (first on-off valve) 19a water supply valve body part 19b main valve body 19c pilot valve port 19d pressure chamber 20 holding mechanism 20a holding mechanism body part 20b engaging member 20c engaging receiving member 20d spring 20e inclined surface 20f opening 21 delayed valve opening mechanism 21a transmission arm member (second on-off valve drive mechanism) 21b support part 21c water receiving part 21d balance float 21e connecting part 21f pilot valve 21g release end 21h discharge hole 22 clutch mechanism 23 inlet pipe 24 outlet pipe 24a branch portion 24b first downcomer 24c second downcomer 25 rim water supply pipe (spout water supply pipe) 25a branch portion 25b downcomer 26 drain valve float mechanism 26a float portion 26b engaging portion 30a constant flow valve 30b vacuum breaker 31 vacuum breaker 32 water supply pipe 32a stopcock 32b constant flow valve 33 water supply pipe branch portion 33a first branch pipe 33b second branch pipe 104 washing water tank device 106 remote control 108 gripping ring (manual operation part) 116 manual valve opening mechanism 116a movable member 116b pilot valve body 116c coil spring 116d wire 117 solenoid valve 117a driving coil 117b plunger 117c pilot valve body 118 drain valve control valve (second on-off valve) 118a control valve main body portion 118b main valve body 118c pilot valve port 118d pressure chamber 119 water supply control valve (first on-off valve) 119a water supply valve main body portion 119b main valve body 119c pilot valve port 119d pressure chamber 119e pilot valve port for power failure 121 delay valve opening mechanism 121a transmission arm member (second on-off valve drive mechanism) 121b support part 121c water receiving part 121d balance float 121e connecting part 121f pilot valve

Claims

1. A cleaning water tank device for supplying cleaning water to an upper water discharge port above the water storage surface of a flush toilet body and a lower water discharge port below the water storage surface, comprising: a cleaning water tank body; a drain valve that switches the discharge and stop of the cleaning water stored in the cleaning water tank body to thereby switch the discharge and stop of the cleaning water from the lower water discharge port; a hydraulic drive mechanism that drives the drain valve by the water supply pressure of the cleaning water supplied from a water supply source; a first on-off valve that switches the discharge state and discharge stop state of the cleaning water supplied from the water supply source from the upper water discharge port based on a user's operation; a second on-off valve that switches the water supply and stop of the cleaning water supplied from the water supply source to the hydraulic drive mechanism; a water receiving part configured to utilize a part of the cleaning water introduced through the first on-off valve, and a delay valve opening mechanism that opens the second on-off valve by the water receiving part after a predetermined time has elapsed since the first on-off valve opened and water discharge from the upper water discharge port started, and supplies cleaning water to the hydraulic drive mechanism; A cleaning water tank device, characterized by comprising the above.

2. The delay valve opening mechanism includes a balance float arranged to receive buoyancy from the cleaning water stored in the cleaning water tank body, the water receiving part configured such that a part of the cleaning water introduced through the first on-off valve flows in, and a second on-off valve drive mechanism connected to the balance float and the water receiving part. The cleaning water tank device according to claim 1, wherein the second on-off valve drive mechanism opens the second on-off valve when the weight of the water receiving part increases due to the inflow of cleaning water and overcomes the buoyancy acting on the balance float.

3. Furthermore, it has a water discharge port supply water pipe connected to the downstream side of the first on-off valve and communicating with the upper water discharge port, a branch part is provided in this water discharge port supply water pipe, and the cleaning water branched at this branch part flows into the water receiving part. The cleaning water tank device according to claim 2.

4. The water receiving part is provided with a discharge hole for discharging the cleaning water in the water receiving part into the cleaning water tank body, and this discharge hole discharges the cleaning water at a flow rate less than the flow rate of the cleaning water flowing into the water receiving part. The cleaning water tank device according to claim 2 or 3, wherein the water receiving part is arranged above the water surface at the water stop level of the cleaning water tank body.

5. The water receiving part is provided with a connecting part, and the water receiving part is connected to the balance float with a space therebetween above the balance float by the connecting part. The washing water tank device according to any one of claims 2 to 4.

6. The second on-off valve includes a diaphragm valve, a pressure chamber that presses the diaphragm valve, and a pilot valve that controls the pressure in the pressure chamber. The second on-off valve drive mechanism opens and closes the pilot valve based on the gravity acting on the water receiving part and the buoyancy acting on the balance float. The washing water tank device according to any one of claims 2 to 5.

7. A flushing toilet device, A flushing toilet main body having an upper water discharge port above the water storage surface and a lower water discharge port below the water storage surface, The washing water tank device according to any one of claims 1 to 6, which supplies washing water to the upper water discharge port and the lower water discharge port, characterized by comprising the above.

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