Washing water tank device and flush toilet device equipped with the same

Abstract

To provide a washing water tank device capable of stopping securely at accurate timing, washing water supplied from a water supply source.SOLUTION: A washing water tank device (4) for supplying washing water to an upper water discharge port and a lower water discharge port of a water closet body (2) comprises: a washing water tank body (10); a drain valve (12) that on the basis of a user's operation, discharges, from the lower water discharge port, the washing water in the washing water tank body; a first on-off valve (19) for switching causing / stopping discharge from the upper water discharge of the washing water from a water supply source; a first on-off valve drive mechanism (16) that on the basis of the user's operation, is moved from a stop position to a discharge position; an energization mechanism (17) for moving the first on-off valve drive mechanism to the stop position; a holding mechanism (20) for holding the first on-off valve drive mechanism at the discharge position so as to be kept at the discharge position against energization force; and a release mechanism (21) for releasing holding of the first on-off valve drive mechanism by the holding mechanism, using the washing water discharged from the first on-off valve.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 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 pipe from the rim water passage part is started. Here, a float is attached to the tip of the lever member, and a force to push up the lever member acts on the lever member due to the buoyancy acting on the float. However, the state where the lever member is pushed down is held by the engagement of the rotary push part provided in the toilet washing tank device and the lever member.

[0003] Furthermore, the water storage tank is provided with a delayed opening valve type tank drainage means. After the water discharge from the rim water passage part is started, the washing water in the water storage tank is discharged to the jet water guide passage with a delay. When the water level in the water storage tank drops to a predetermined level due to the discharge of the washing water in the water storage tank, the buoyancy acting on the float provided on the lever member disappears, so the engagement between the rotary push part and the lever member is released. When the engagement between the rotary push part and the lever member is released, the rotary push part is rotated, and accordingly the switching valve is switched to the side of the water supply in the tank. Thereby, the water discharge from the rim water passage part is stopped, and the washing water flowing in from the water supply source through the water supply valve is supplied into the water storage tank. When the water level in the water storage tank rises due to the water supply into the water storage tank, the lever member is pushed up by the buoyancy acting on the float. When the water level in the water storage tank rises to a predetermined level, the ball tap type water supply valve is closed by the lever member, and the toilet washing tank device returns to the initial state.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, in the toilet bowl cleaning tank device described in Patent Document 1, when the cleaning water in the water storage tank is discharged and the water level in the water storage tank drops, the engagement between the rotary pressing part and the lever member is released, and the switching valve is switched from the rim water passage side to the side of water supply into the tank. Therefore, in the toilet bowl cleaning tank device described in Patent Document 1, the stop of water discharge from the rim water discharge port is determined by the water level in the water storage tank. However, since the water level in the water storage tank changes depending on the drainage of the cleaning water from the water storage tank and the flow rate of the cleaning water flowing into the water storage tank through the water supply valve, it is difficult to precisely control.

[0006] Also, in the toilet bowl cleaning tank device described in Patent Document 1, the engagement state between the rotary pressing part and the lever member is maintained by the buoyancy acting on the float attached to the lever member. Therefore, due to the rippling of the water surface in the water storage tank or the like, the engagement between the rotary pressing part and the lever member may be released at an unintended timing. Accordingly, in the toilet bowl cleaning tank device described in Patent Document 1, there is a problem that it is difficult to accurately control the timing to stop the cleaning water supplied from the water supply source and discharged from the rim water passage part.

[0007] Therefore, an object of the present invention is to provide a cleaning water tank device that can surely stop the cleaning water supplied from the water supply source at an accurate timing, and a flush toilet device equipped with the same.

Means for Solving the Problems

[0008] In order to solve the above problems, the present invention provides 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, the cleaning water tank device including a cleaning water tank main body, a drain valve that discharges the cleaning water stored in the cleaning water tank main body based on a user's operation and discharges the cleaning water from the lower water discharge port, a first on-off valve for switching between a discharge state and a discharge stop state of the cleaning water supplied from a water supply source from the upper water discharge port, a first on-off valve drive mechanism that moves the first on-off valve from a stop position where the first on-off valve is in the discharge stop state to a discharge position where the first on-off valve is in the discharge state based on a user's operation, a biasing mechanism that generates a biasing force so that the first on-off valve drive mechanism moves to the stop position, a holding mechanism that holds the first on-off valve drive mechanism moved to the discharge position against the biasing force generated by the biasing mechanism, and a release mechanism that releases the holding of the first on-off valve drive mechanism by the holding mechanism using the cleaning water flowing out from the first on-off valve.

[0009] In the present invention configured as described above, based on a user's operation, the drain valve discharges the cleaning water stored in the cleaning water tank main body from the lower water discharge port of the flush toilet body. Further, the first on-off valve drive mechanism moves the first on-off valve from a stop position where the first on-off valve is in the discharge stop state to a discharge position where the first on-off valve is in the discharge state based on a user's operation, and the first on-off valve discharges the cleaning water supplied from the water supply source from the upper water discharge port. Furthermore, the biasing mechanism generates a biasing force so that the first on-off valve drive mechanism moves to the stop position, and the holding mechanism holds the first on-off valve drive mechanism in the discharge position against the biasing force generated by the biasing mechanism. The release mechanism releases the holding of the first on-off valve drive mechanism by the holding mechanism using the cleaning water flowing out from the first on-off valve.

[0010] According to the present invention configured as described above, by using the washing water supplied from a water supply source such as a waterworks and flowing out from the first on-off valve, the holding state of the first on-off valve drive mechanism is released, and the first on-off valve drive mechanism is moved to the stop position. Therefore, it is possible to reliably stop the water discharge from the upper water discharge port at an accurate timing without being affected by the water level inside the washing water tank body. Further, since the first on-off valve drive mechanism is biased by the biasing force of the biasing mechanism, the biasing force is stable, and it is possible to prevent the first on-off valve drive mechanism from being accidentally moved, and the first on-off valve drive mechanism can be reliably operated.

[0011] In the present invention, preferably, the release mechanism releases the holding of the first on-off valve drive mechanism and moves the first on-off valve drive mechanism to the stop position based on the amount of washing water flowing out from the first on-off valve.

[0012] According to the present invention configured as described above, since the release mechanism releases the holding of the first on-off valve drive mechanism based on the amount of washing water flowing out from the first on-off valve, it is possible to accurately set the time during which the first on-off valve is open, and it is possible to precisely control the amount of washing water discharged from the upper water discharge port.

[0013] In the present invention, preferably, the washing water flowing out from the first on-off valve is branched and supplied to the upper water discharge port and the release mechanism, respectively.

[0014] According to the present invention configured as described above, since the washing water flowing out from the first on-off valve is branched and supplied to the upper water discharge port and the release mechanism, respectively, the washing water supplied from the water supply source and flowing out from the first on-off valve can be used for both the washing of the water closet and the operation of the release mechanism.

[0015] In the present invention, preferably, the release mechanism includes a water receiving portion into which the washing water supplied from the first on-off valve flows, and when the washing water accumulated in this water receiving portion exceeds a predetermined amount, the holding of the first on-off valve drive mechanism by the holding mechanism is released.

[0016] According to the present invention configured as described above, since the holding of the first on-off valve drive mechanism is released by the amount of the washing water supplied from the first on-off valve and accumulated in the water receiving portion, the holding by the holding mechanism can be released based on the amount of the washing water by a simple mechanism.

[0017] In the present invention, preferably, further, a second on-off valve for opening the drain valve is provided, and when the washing water accumulated in the water receiving portion exceeds a predetermined amount, the release mechanism releases the holding of the first on-off valve drive mechanism and opens the second on-off valve.

[0018] According to the present invention configured as described above, when the washing water accumulated in the water receiving portion exceeds a predetermined amount, the release mechanism releases the holding of the first on-off valve drive mechanism and opens the second on-off valve, so that the drain valve can also be controlled by using the washing water flowing out from the first on-off valve.

[0019] In the present invention, preferably, further, a hydraulic drive mechanism for opening and closing the drain valve is provided, and this hydraulic drive mechanism opens the drain valve by the water pressure of the washing water supplied through the second on-off valve.

[0020] According to the present invention configured as described above, since a hydraulic drive mechanism for opening and closing the drain valve is provided, the drain valve can be opened even with a relatively small amount of washing water flowing out from the second on-off valve.

[0021] In the present invention, preferably, the biasing mechanism is provided inside the washing water tank main body, and has a small tank for storing the washing water and a biasing float disposed in this small tank, and the biasing mechanism generates a biasing force by the buoyancy acting on the biasing float.

[0022] According to the present invention configured as described above, since the biasing force by the biasing mechanism is generated by the buoyancy acting on the biasing float, the biasing force can be surely generated by a simple mechanism. Further, since the biasing float is disposed in the small tank, a stable biasing force can be generated regardless of the water level inside the washing water tank main body.

[0023] In the present invention, preferably, the holding mechanism includes an engaging member and an engaging receiving member that engages with the engaging member. When the engaging member engages with the engaging receiving member, the first on-off valve driving mechanism is held at the discharge position.

[0024] According to the present invention configured as described above, the holding mechanism holds the first on-off valve driving mechanism at the discharge position when the engaging member engages with the engaging receiving member. Therefore, with a simple mechanism, the first on-off valve driving mechanism can be reliably held at the discharge position.

[0025] In the present invention, preferably, the engaging member is provided so as to be movable between an engaged position and a disengaged position, and the engaging member is biased toward the engaged position by an elastic member.

[0026] According to the present invention configured as described above, since the engaging member is biased toward the engaged position by the elastic member, the engaging member can be moved to the engaged position with a simple mechanism, and the holding mechanism can be reliably operated.

[0027] In the present invention, preferably, the engaging member includes an inclined surface. When the first on-off valve driving mechanism is moved to the discharge position based on the operation of the user, the engaging member is moved toward the disengaged position against the biasing force of the elastic member by the sliding of the inclined surface of the engaging member on the engaging receiving member.

[0028] According to the present invention configured as described above, since the inclined surface of the engaging member slides on the engaging receiving member, the engaging member is moved toward the disengaged position. Therefore, based on the operation of the user, the engaging member can be reliably moved with a simple mechanism.

[0029] The present invention also relates to a flushing toilet device, which is characterized by including 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 a cleaning water tank device of the present invention that supplies cleaning water to the upper water discharge port and the lower water discharge port.

Effects of the Invention

[0030] According to the cleaning water tank device of the present invention, the discharge timing of the cleaning water can be accurately set without using a motor for pulling up the drain valve.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Best Mode for Carrying Out the Invention

[0032] Next, with reference to the accompanying drawings, a flushing toilet device according to an embodiment of the present invention will be described. FIG. 1 is a perspective view showing the entire flushing toilet device according to an embodiment of the present invention. FIG. 2 is a full cross-sectional view of the flushing toilet device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a schematic configuration of a washing water tank device according to an 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 washing water tank device according to an embodiment of the present invention. FIG. 5 is a perspective view showing the entire washing water tank device according to an embodiment of the present invention.

[0033] As shown in FIGS. 1 and 2, the flushing toilet device 1 according to an embodiment of the present invention is composed of a flushing toilet main body 2 and a washing water tank device 4 according to an 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, by operating a lever handle 8 provided on the washing water tank device 4, the bowl portion 2a of the flushing toilet main body 2 is washed. The washing water tank device 4 according to the present embodiment is configured to supply the washing water stored therein and the washing water supplied from a water supply source, i.e., a water pipe C, to the flushing toilet main body 2 based on the operation of the lever handle 8, and to wash the bowl portion 2a with these washing waters.

[0034] 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, for example, it can also be provided in the flushing toilet main body 2 or the cleaning water tank device 4. Further, the human presence sensor (not shown) only needs to be able to detect the user's sitting, leaving, approaching, departing, or hand-waving actions. 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.

[0035] 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 main 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 main 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 main body 2 during toilet cleaning. Also, the cleaning water supplied from the water supply C and supplied through 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.

[0036] 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 from a stop position where the water supply control valve 19 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 moves to the stop position. The washing water tank device 4 also includes a holding mechanism 20 that holds the water supply valve drive mechanism 16 moved to the discharge position against the biasing force of the biasing mechanism 17, and a release mechanism 21 that releases the holding of the water supply valve drive mechanism 16 by the holding mechanism 20 using the washing water flowing out from the water supply control valve 19. Furthermore, the washing water tank device 4 has 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.

[0037] The water storage tank 10 is a tank configured to store the washing water to be supplied to the jet discharge port 2b of the flush toilet body 2, and a drain port 10a (FIG. 3) for discharging the stored washing water to the flush toilet 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 stop water level L 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 discharge port 2b of the flush toilet body 2. 1 than. Accordingly, 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 discharge port 2b of the flush toilet body 2.

[0038] 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 body 2 and discharged from the jet discharge port 2b provided at the lower part of the bowl portion 2a.

[0039] Next, referring 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 the 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.

[0040] The cylinder 14a is a cylindrical member, arranged with its axis in the vertical direction, and slidably receives the piston 14b inside. Also, the inflow pipe 23 is connected to the lower end of the cylinder 14a, and 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.

[0041] 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 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.

[0042] 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 in 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.

[0043] 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 the inside of 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.

[0044] 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. 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.

[0045] 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 upper movement of the piston 14b and the upper rod 15a, and the lower rod 15b, together with the drain valve 12, descends by gravity while resisting buoyancy.

[0046] Also, 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 engagement portion 26b that is interlocked with the float portion 26a.

[0047] The engagement portion 26b is configured to engage with the lower rod 15b that has been disengaged and descended by the clutch mechanism 22, and 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, and when the water level in the water storage tank 10 drops to a predetermined level, the float portion 26a rotates the engagement portion 26b to release the engagement between the engagement portion 26b and the lower rod 15b. When the engagement is released, 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.

[0048] 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 that connects 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.

[0049] Next, the drain valve control valve 18 includes a control valve main body portion 18a, a main valve body 18b disposed within the control valve main body portion 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 release mechanism 21. When the pilot valve port 18c is opened, the pressure in a pressure chamber 18d (FIG. 11) provided within the control valve main body portion 18a decreases, and the main valve body 18b of the drain valve control valve 18 is opened. Also, when the pilot valve port 18c is closed, the pressure in the pressure chamber 18d increases, and the main valve body 18b is closed. Thereby, based on the operation of the release mechanism 21, the main valve body 18b of the drain valve control valve 18 is opened and closed, and the supply of water to and the stop of the drain valve hydraulic drive unit 14 are controlled.

[0050] That is, the drain valve control valve 18 controls the supply of the supplied cleaning water to and the stop of 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 a 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.

[0051] 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.

[0052] The stop valve 32a is provided to stop the supply of water to the wash 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 water at a constant flow rate regardless of the installation environment of the flush toilet device 1.

[0053] 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. 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 wash water flowing into the rim water supply pipe 25 is discharged from the rim water discharge port 2d as rim wash 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 side of the water supply control valve 19 becomes negative pressure, it is possible to prevent water from flowing back from the side of the flush toilet body 2 into 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 wash water flowing through the rim water supply pipe 25 flows into the down pipe 25b, and the remaining wash water is discharged from the rim water discharge port 2d.

[0054] 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.

[0055] 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 release mechanism 21 will be described. FIG. 6 is a perspective view showing a part of the water supply valve drive mechanism 16 and the release mechanism 21. FIG. 7 is a side view showing the water supply valve drive mechanism 16 in an enlarged manner. FIG. 8 is a rear view showing the holding mechanism 20 and the release mechanism 21 in an enlarged manner. FIG. 9 is a schematic diagram for explaining the operation of the holding mechanism 20 and the release 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.

[0056] 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 be moved 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 the 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 of the drive arm member 16a, 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 the water supply valve main body portion 19a of the water supply control valve 19.

[0057] That is, in a state where 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, so 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, in a state where the drive arm member 16a is moved to the discharge position, the pilot valve port 19c is opened, so the pressure in the pressure chamber 19d decreases, and the main valve body 19b is opened. The drive arm member 16a of the water supply valve drive mechanism 16 is moved from the stop position to the discharge position by the user operating 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).

[0058] 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 for storing washing water, a biasing float 17b disposed in the small tank 17a, and a biasing rod 17c extending 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 always subjected to buoyancy from the washing water stored in the small tank 17a regardless of the water level in the water storage tank 10, and is configured to generate an upward biasing force. The biasing rod 17c is a rod-shaped member extending upward from the upper part of the biasing float 17b. As shown in FIG. 7, 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 a result, 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.

[0059] In this embodiment, the biasing mechanism 17 has the small tank 17a and the 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 also be configured such that a biasing force is generated by an elastic member such as a coil spring.

[0060] 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 disengaging 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.

[0061] The engaging receiving member 20c is a plate-like member fixed at a position facing the holding mechanism main body 20a and is provided with an opening 20f for receiving the engaging member 20b. When the user operates the lever handle 8, the drive arm member 16a rotates 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 engaging member 20b protruding from the holding mechanism main body 20a abuts against the upper end of the engaging 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 engaging member 20b slides on the upper end of the engaging receiving member 20c, and the tip of the engaging member 20b retreats toward the holding mechanism main body 20a. That is, the engaging member 20b is moved from the engaging position toward the disengaging position against the biasing force of the spring 20d by sliding on the engaging receiving member 20c.

[0062] When the holding mechanism main body 20a is further pushed down and the drive arm member 16a is moved to the discharge position, the engaging 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 engaging 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 engaging member 20b protrudes into the opening 20f of the engagement receiving member 20c. That is, the engaging member 20b is moved from the engagement release position to the engagement position, and the engaging 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. Thereby, the drive arm member 16a is held at the discharge position against the biasing force of the biasing mechanism 17.

[0063] Next, the configuration of the release mechanism 21 will be described. As shown in FIG. 5, the release mechanism 21 includes a release arm member 21a formed generally in a U-shape, a support portion 21b that rotatably supports the release arm member 21a, a water receiving portion 21c attached to one end of the release 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.

[0064] The release arm member 21a is rotatably supported about the support portion 21b and is configured to move between a release position shown by a solid line in FIG. 8 and a non-release position shown by an imaginary line. Further, as shown in FIG. 11, the pilot valve portion 21f of the release arm member 21a functions as a pilot valve that opens and closes the pilot valve port 18c of the drain valve control valve 18. The pilot valve port 18c communicates with a pressure chamber 18d in the control valve main body portion 18a. Therefore, when the release arm member 21a is moved to the release position, the pilot valve port 18c is opened, whereby the pressure in the pressure chamber 18d of the drain valve control valve 18 decreases, and thus the main valve body 18b of the drain valve control valve 18 is opened.

[0065] Also, as shown in FIG. 8, the release arm member 21a extends to the back side of the engagement receiving member 20c, and the release end portion 21g of the release arm member 21a is positioned so as to face the engagement member 20b with the engagement receiving member 20c interposed therebetween. Therefore, when the release arm member 21a is moved from the non-release position shown in column (d) of FIG. 9 to the release position shown in column (e) of FIG. 9, the tip 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 release arm member 21a. Thereby, the engagement between the engagement member 20b and the engagement receiving member 20c is released.

[0066] On the other hand, as shown in FIG. 5, a water receiving portion 21c is connected to the other end of the release arm member 21a. The water receiving portion 21c is a cup-shaped member with an open top, and the water receiving portion 21c is configured such that the washing water branched from the rim water supply pipe 25 at the branch portion 25a and flowing into the down pipe 25b flows in. Further, a discharge hole 21h is provided at the bottom of the water receiving portion 21c, and the washing water flowing into the water receiving portion 21c is discharged into the water storage tank 10 through this discharge hole 21h. Here, the flow rate of the washing water flowing from the down pipe 25b into the water receiving portion 21c is larger than the flow rate of the washing water flowing out from the discharge hole 21h, and in a state where the washing water is flowing in from the down pipe 25b, the water level of the washing water in the water receiving portion 21c rises.

[0067] The balance float 21d is a float attached below the water receiving portion 21c via a connecting portion 21e. The balance float 21d is configured to receive buoyancy from the washing water stored in the water storage tank 10 and push the water receiving portion 21c upward. When there is no washing water stored in the water receiving portion 21c, the water receiving portion 21c is in a state of being pushed upward by the buoyancy received by the balance float 21d. In this state, the release arm member 21a connected to the water receiving portion 21c is moved to the non-release position.

[0068] On the one hand, when the cleaning water flows into the water receiving part 21c from the downcomer 25b, 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 cleaning water flows into the water receiving part 21c, the weight of the water receiving part 21c increases. When the buoyancy acting on the balance float 21d is overcome, the release arm member 21a is moved to the release position. When the release arm member 21a is moved to the release position, the pilot valve port 18c is opened, and thereby, the main valve body 18b of the drain valve control valve 18 is opened.

[0069] Note that since the water receiving part 21c is connected above the balance float 21d via the connecting part 21e, even in a state where the cleaning water has flowed in and the position of the water receiving part 21c has dropped, the water receiving part 21c still remains above the water stop level L 1 in the water storage tank 10. For this reason, the water receiving part 21c itself does not receive buoyancy from the cleaning water in the water storage tank 10, and the water receiving part 21c can effectively push down the balance float 21d when the cleaning water flows in.

[0070] Next, with reference to FIG. 12 newly, the operation of the cleaning water tank device 4 according to the 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 cleaning sequence by the cleaning water tank device 4 according to the embodiment of the present invention.

[0071] First, in the standby state of toilet cleaning at time t in FIG. 12 0 , the water level in the water storage tank 10 is at the water stop level L 1 . In this state, the drive arm member 16a of the water supply valve drive mechanism 16 is in the stop position, and the release arm member 21a of the release mechanism 21 is in the non-release position. Thereby, 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 respectively closed. For this reason, the main valve body 19b of the water supply control valve 19 is in the closed state, and the main valve body 18b of the drain valve control valve 18 is also in the closed state.

[0072] Next, at time t in FIG. 12 1When the user operates the lever handle 8 (Fig. 1), the drive arm member 16a of the water supply valve drive mechanism 16 is moved to the discharge position in conjunction with this operation. When the drive arm member 16a is moved to the discharge position, the holding mechanism main body portion 20a of the holding mechanism 20 connected to the drive arm member 16a and the biasing rod 17c of the biasing mechanism 17 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 column (b) 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 column (c) of Fig. 9). Thereby, the engaging member 20b and the engagement receiving member 20c are engaged with each other.

[0073] 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.

[0074] 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 water discharge port 2d (Fig. 2) of the toilet bowl main body 2, and the washing of the bowl portion 2a is started with the rim washing water as the "front rim" water discharge before the water discharge from the jet water discharge port 2b is started. Also, a part of the washing water that has flowed into the rim water supply pipe 25 flows into the down pipe 25b (Fig. 5), and the flowing-in washing water flows into the water receiving portion 21c of the release mechanism 21 disposed below the down pipe 25b. That is, the washing water flowing out from the water supply control valve 19 is branched and supplied to the rim water discharge port 2d and the water receiving portion 21c of the release mechanism 21, respectively.

[0075] After the water discharge from the rim water discharge port 2d is started, at the time t in Fig. 12 2 When the washing water flowing in from the down pipe 25b in the water receiving portion 21c accumulates 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 release arm member 21a connected thereto is rotated about the support portion 21b, and the release arm member 21a is moved from the non-release position to the release position. When the release arm member 21a is moved to the release position, the pilot valve port 18c (Fig. 11) of the drain valve control valve 18 is opened, so that 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 release arm member 21a is moved to the release position, the holding of the drive arm member 16a by the holding mechanism 20 is also released.

[0076] 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 washing 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. That is, the drain valve control valve 18 is a control valve for opening the drain valve 12.

[0077] When the drain port 10a is opened, the washing water stored in the water storage tank 10 flows out through the drain port 10a and is discharged as "jet water" from the jet water discharge port 2b (Fig. 2) provided at the lower part of the bowl portion 2a. The washing water discharged from the jet water discharge port 2b fills the drain trap pipe 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 2e. In this way, even while the washing water is being discharged from the jet water discharge port 2b, the water discharge from the rim water discharge port 2d continues as "middle rim" water discharge. Therefore, when the drain port 10a is opened, the washing water is discharged simultaneously from both the rim water discharge port 2d and the jet water discharge port 2b.

[0078] As described above, in the flushing toilet device 1 of the present embodiment, the supply of the washing water from the rim water discharge port 2d continues even while the siphon phenomenon is occurring due to the washing water discharged from the jet water discharge port 2b. Therefore, it is possible to suppress the excessive decrease in the accumulated water in the bowl portion 2a due to the siphon phenomenon pulling in the accumulated water and the interruption of the water seal in the drain trap pipe 2e. 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 water discharge port 2d continues even while the siphon phenomenon is occurring, the water seal is not interrupted, the siphon phenomenon can be continued, and the termination of the siphon phenomenon halfway can be suppressed.

[0079] 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 disengages the lower rod 15b and the drain valve 12 from the upper rod 15a. As a result, while the upper rod 15a remains pushed upward together with the piston 14b during the opening of the drain valve control valve 18, the lower rod 15b and the drain valve 12 descend due to their own weights. However, the disengaged lower rod 15b engages with the engaging portion 26b of the drain valve float mechanism 26, preventing the lower rod 15b and the drain valve 12 from descending. Thereby, 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.

[0080] Further, when cleaning water flows into the cylinder 14a of the drain valve hydraulic drive unit 14 from the inflow pipe 23 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 into the cylinder 14a from the inflow pipe 23 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 toilet 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.

[0081] On one hand, when the release arm member 21a is moved to the release position, the release end portion 21g (FIG. 8) of the release arm member 21a presses back the engagement member 20b that faces the engagement receiving member 20c of the holding mechanism 20 with the engagement receiving member 20c in between (from column (d) to column (e) in FIG. 9), releasing the engagement between the engagement member 20b and the engagement receiving member 20c. When the engagement between the engagement member 20b and the engagement 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 release mechanism 21 uses the weight of the washing water that flows out from the water supply control valve 19 and accumulates 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 release 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 engagement member 20b and the engagement receiving member 20c is released, the biasing rod 17c rises gently.

[0082] 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 engagement portion 26b. Thereby, the engagement between the lower rod 15b and the engagement portion 26b is released, and the lower rod 15b and the drain valve 12 begin to descend again. And at time t in FIG. 12 3 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.

[0083] Furthermore, even after the drain port 10a is closed, the drain valve control valve 18 remains open, so 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. 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, thereby 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 port 10a is closed, the washing water flowing into the overflow pipe 10b flows into the bowl portion 2a through the jet outlet 2b in a small flow rate, and the flowing-in washing water is used as refill water.

[0084] Furthermore, at time t in FIG. 12 3 after the water discharge from the jet outlet 2b stops, at time t 4 the drive arm member 16a of the water supply valve drive 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. 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 drive unit 14 is used for the refill of the bowl portion 2a.

[0085] 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 this is used for the refill of the bowl portion 2a. On the other hand, 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.

[0086] 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 release mechanism 21 through the downcomer 25b branched from the rim water supply pipe 25 (Fig. 5) also stops. Further, as described above, a discharge hole 21h (Fig. 5) is provided in 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. 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.

[0087] At the time t in Fig. 12 5 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 release arm member 21a (Fig. 5) connected to the water receiving part 21c is rotated from the release position to the non-release position around the support part 21b. When the release arm member 21a is moved to the non-release position, the pilot valve port 18c (Fig. 11) of the drain valve control valve 18 is closed. As a result, 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. Thus, 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 L 1 and becomes.

[0088] 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 bowl is cleaned, the upper rod 15a and the lower rod 15b are both pulled up by the piston 14b. Thus, one-time toilet bowl cleaning is completed, and the flushing toilet device 1 returns to the standby state for toilet bowl cleaning.

[0089] According to the washing water tank device 4 of the embodiment of the present invention, by using the washing water supplied from a water supply source such as a water supply C and flowing out from the water supply control valve 19 which is a first on-off valve, the holding state of the water supply valve drive mechanism 16 is released and the water supply valve drive mechanism 16 is moved to the stop position. Therefore, it is possible to surely stop the water discharge from the rim water discharge port 2d at an accurate timing without being affected by the water level in the water storage tank 10. Further, since the water supply valve drive mechanism 16 is biased by the biasing force of the biasing mechanism 17, the biasing force is stable without being affected by the water level in the water storage tank 10, and it is possible to prevent the water supply valve drive mechanism 16 from being accidentally moved, and the water supply valve drive mechanism 16 can be surely operated.

[0090] Further, according to the washing water tank device 4 of the present embodiment, since the release mechanism 21 releases the holding of the water supply valve drive mechanism 16 based on the amount of the washing water flowing out from the water supply control valve 19, the time during which the first on-off valve is opened can be accurately set, and the amount of the washing water discharged from the upper water discharge port can be precisely controlled.

[0091] Furthermore, according to the washing water tank device 4 of the present embodiment, the washing water flowing out from the water supply control valve 19 is branched and supplied to the rim water discharge port 2d and the water receiving portion 21c of the release mechanism 21 respectively. Therefore, the washing water supplied from the water supply source and flowing out from the water supply control valve 19 can be used for both the washing of the water closet and the operation of the release mechanism 21.

[0092] Further, according to the washing water tank device 4 of the present embodiment, since the holding of the water supply valve drive mechanism 16 is released by the amount of the washing water supplied from the water supply control valve 19 and accumulated in the water receiving portion 21c, the holding by the holding mechanism 20 can be released based on the amount of the washing water by a simple mechanism.

[0093] Furthermore, according to the washing water tank device 4 of the present embodiment, when the amount of the washing water accumulated in the water receiving portion 21c exceeds a predetermined amount, the release mechanism 21 releases the holding of the water supply valve drive mechanism 16 and opens the drain valve control valve 18 which is a second on-off valve. Therefore, the drain valve 12 can also be controlled by using the washing water flowing out from the water supply control valve 19.

[0094] Also, according to the washing water tank device 4 of the present embodiment, since the drain valve hydraulic drive unit 14, which is a hydraulic drive mechanism for opening and closing the drain valve 12, is provided, even a relatively small amount of washing water flowing out from the drain valve control valve 18 can open the drain valve 12.

[0095] Furthermore, according to the washing water tank device 4 of the present embodiment, since the biasing force by the biasing mechanism 17 is generated by the buoyancy acting on the biasing float 17b, a biasing force can be surely generated with a simple mechanism. Also, since the biasing float 17b is disposed in the small tank 17a, a stable biasing force can be generated regardless of the water level in the water storage tank 10.

[0096] Also, according to the washing water tank device 4 of the present embodiment, the holding mechanism 20 holds the water supply valve drive mechanism 16 in the discharge position by the engagement member 20b engaging with the engagement receiving member 20c, so that the water supply valve drive mechanism 16 can be surely held in the discharge position with a simple mechanism.

[0097] Furthermore, according to the washing water tank device 4 of the present embodiment, since the engagement member 20b is biased toward the engagement position by the spring 20d which is an elastic member, the engagement member 20b can be moved to the engagement position with a simple mechanism, and the holding mechanism 20 can be surely operated.

[0098] Also, according to the washing water tank device 4 of the present embodiment, since the inclined surface 20e of the engagement member 20b slides on the engagement receiving member 20c, the engagement member 20b is moved toward the engagement release position, so that the engagement member 20b can be surely moved with a simple mechanism based on the operation of the user.

[0099] 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 embodiment, 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 embodiment, 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.

Explanation of Reference Numerals

[0100] 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 portion 16c Pilot valve portion 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 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 Release mechanism 21a Release arm member 21b Support part 21c Water receiving part 21d Balance float 21e Connecting part 21f Pilot valve part 21g Release end 21h Discharge hole 22 Clutch mechanism 23 Inflow pipe 24 Outflow pipe 24a Branch part 24b First down pipe 24c Second down pipe 25 Rim water supply pipe 25a Branch part 25b Down pipe 26 Drain valve float mechanism 26a Float part 26b Engaging part 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 section 33a First branch pipe 33b Second branch pipe

Claims

1. 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, comprising: a washing water tank body; a drain valve that discharges the washing water stored in the washing water tank body based on a user's operation and discharges the washing water from the lower water discharge port; a first on-off valve for switching between a discharge state and a discharge stop state of the washing water supplied from a water supply source from the upper water discharge port; The first on-off valve is configured to switch between a discharge stop state and a discharge state by moving a drive member from a stop position to a discharge position based on a user's operation; a first on-off valve drive mechanism including a biasing mechanism that generates a biasing force so that the drive member is moved to the stop position; a holding mechanism that holds the drive member moved to the discharge position against the biasing force by the biasing mechanism; a release mechanism that releases the holding of the drive member by the holding mechanism by using the washing water flowing out from the first on-off valve; having; The release mechanism has a water receiving portion that uses a part of the washing water introduced through the first on-off valve; A washing water tank device characterized in that when the washing water introduced into the water receiving portion through the first on-off valve reaches a predetermined amount, the water receiving portion moves to release the engagement of the holding mechanism.

2. The washing water tank device according to claim 1, wherein the release mechanism releases the holding of the first on-off valve drive mechanism based on the amount of washing water flowing out from the first on-off valve and moves the first on-off valve drive mechanism to the stop position.

3. The washing water tank device according to claim 2, wherein the washing water flowing out from the first on-off valve is branched and supplied to the upper water discharge port and the release mechanism, respectively.

4. In the water receiving portion of the release mechanism, the washing water supplied from the first on-off valve flows in, and when the washing water accumulated in the water receiving portion exceeds a predetermined amount, the holding of the first on-off valve drive mechanism by the holding mechanism is released. The washing water tank device according to claim 3.

5. Furthermore, it has a second on-off valve for opening the drain valve, and when the washing water accumulated in the water receiving portion exceeds a predetermined amount, the release mechanism releases the holding of the first on-off valve drive mechanism and opens the second on-off valve. The washing water tank device according to claim 4.

6. Furthermore, it has a hydraulic drive mechanism for opening and closing the drain valve, and this hydraulic drive mechanism opens the drain valve by the water pressure of the washing water supplied through the second on-off valve. The washing water tank device according to claim 5.

7. The biasing mechanism is provided inside the main body of the washing water tank, and includes a small tank for storing washing water and a biasing float disposed inside the small tank. The biasing mechanism generates a biasing force by the buoyancy acting on the biasing float. The washing water tank device according to any one of claims 1 to 6.

8. The holding mechanism includes an engaging member and an engaging receiving member that engages with the engaging member. When the engaging member engages with the engaging receiving member, the first on-off valve drive mechanism is held in the discharge position. The washing water tank device according to any one of claims 1 to 7.

9. The engaging member is provided so as to be movable between an engaged position and a disengaged position, and the engaging member is biased toward the engaged position by an elastic member. The washing water tank device according to claim 8.

10. The engaging member has an inclined surface. When the first on-off valve drive mechanism is moved to the discharge position based on the operation of the user, the engaging member moves toward the disengaged position against the biasing force of the elastic member by sliding the inclined surface on the engaging receiving member. The washing water tank device according to claim 9.

11. A flush toilet device, A flush toilet 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 10 that supplies washing water to the upper water discharge port and the lower water discharge port, Characterized by having.

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