Flush water tank device and flush toilet device equipped with same

Abstract

To provide a washing water tank device in which the occurrence of turbulence of flow at a flow channel branch portion of a water supply device can be suppressed, and a flush toilet bowl device comprising the washing water tank device.SOLUTION: A washing water tank device comprises: a drain valve hydraulic drive unit 14 driving a drain valve using water supply pressure of washing water; and a water supply device 16 which supplies washing water from a water supply source, and comprises a flow channel branch portion 33 for making a flow channel branch toward a flush toilet bowl side flow channel 25 and a drain valve hydraulic drive unit side flow channel 23. The flow channel branch portion of the water supply device comprises: a pre-branch flow channel 33a; a first branch flow channel 33b connected to the flush toilet bowl side flow channel; and a second branch flow channel 33c connected to the drain valve hydraulic drive unit side flow channel. The water supply device further comprises: a first pressure valve 38 which is provided in the first branch flow channel and adjusts pressure of washing water in the first branch flow channel; and a second pressure valve 40 which is provided in the second branch flow channel and adjusts pressure of washing water in the second branch flow channel.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a flush water tank apparatus, and more particularly to a flush water tank apparatus that supplies flush water to a flush toilet, and a flush toilet apparatus equipped with the same. [Background technology]

[0002] Patent Document 1 discloses a flush toilet. This flush toilet is configured to discharge jet flush water from a jet outlet provided at the bottom of the bowl, and rim flush water from a rim water outlet hole provided at the top end of the bowl. In this flush toilet, flush water supplied from a stop valve is alternately switched between a low tank side flow path and a bowl side flow path by a water supply branch fitting. The jet flush water uses water stored in the low tank from the low tank side flow path. Also, the rim flush water uses water supplied from the bowl side flow path. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-61252 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a flush toilet such as that shown in Patent Document 1, the flow rate and water pressure required for the low tank side flow path after the water supply branch fitting and the bowl side flow path are different, so there is a problem that the flow of flush water in the water supply branch fitting becomes uneven, causing flow disturbance. Also, in a flush toilet such as that shown in Patent Document 1, water cannot be supplied from the water supply branch fitting to the low tank side flow path and the bowl side flow path at the same time. If water is to be supplied to the low tank side flow path and the bowl side flow path at the same time, there is a concern that the flush water will flow unevenly into one of the flow paths, and the problem of flow disturbance caused by the uneven flow of flush water will become more pronounced.

[0005] Therefore, the present invention has been made to solve the problems and issues of the conventional technology described above, and aims to provide a flush water tank device that can suppress the occurrence of flow disturbances at the flow path branching point of the water supply device, and a flush toilet device equipped with the same. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, one embodiment of the present invention is a flush water tank device that supplies flush water to a flush toilet, comprising a water storage tank that stores flush water to be supplied to the flush toilet and is formed with a drain outlet for discharging the stored flush water into the flush toilet, a drain valve that opens and closes the drain outlet and starts and stops the supply of flush water to the flush toilet, a drain valve hydraulic pressure drive unit that uses the supply pressure of the supplied flush water to drive the drain valve, and a water supply device that supplies flush water from a water supply source, the water supply device comprising a flush toilet side flow path that directly supplies flush water to the flush toilet, and a drain valve hydraulic pressure drive unit that is connected to the flush toilet side flow path. and a flow path branching section that branches a flow path toward a water supply source side flow path extending from the water supply source, the flow path branching section of the water supply device comprising a pre-branch flow path connected to a water supply source side flow path extending from the water supply source, a first branch flow path connected to the flush toilet side flow path, and a second branch flow path connected to the drain valve water pressure drive unit side flow path, the water supply device further comprising a first pressure valve provided in the first branch flow path and adjusting the pressure of flush water in the first branch flow path, and a second pressure valve provided in the second branch flow path and adjusting the pressure of flush water in the second branch flow path. According to one embodiment of the present invention configured in this manner, the second branch flow path of the flow path branching portion of the water supply device is connected to the flow path on the drain valve hydraulic drive portion side, which is connected to the drain valve hydraulic drive portion. Usually, the drain valve hydraulic drive portion requires a relatively large pressure of flush water to drive the drain valve. This may cause the pressure of flush water in the second branch flow path connected to the flow path on the drain valve hydraulic drive portion side to increase or fluctuate. In addition, when either the first branch flow path or the second branch flow path is open, a water pressure of flush water that is greater than necessary is generated, and for example, when only the first branch flow path connected to the flow path on the flush toilet side is open, flush water may splash from the opening on the flush toilet side. In response to this, the first pressure valve can suppress the increase or fluctuation of the pressure of flush water in the first branch flow path. In addition, when flush water is supplied from the flow path branching portion to the second branch flow path, the second pressure valve can suppress the increase or fluctuation of the pressure of flush water in the second branch flow path. Therefore, it is possible to prevent the flush water from flowing unevenly to the first or second branch flow path due to an increase in pressure at the flow path branching portion, which causes flow disturbance at the flow path branching portion. This improves the water supply performance from the water supply device having the flow path branching portion. In addition, for example, when flush water is supplied from the pre-branching flow path to both the first branch flow path and the second branch flow path at the same time, the pressure of the flush water in the second branch flow path is adjusted by the second pressure valve and the pressure of the flush water in the first branch flow path is adjusted by the first pressure valve, which prevents an increase in the pressure difference between the second branch flow path and the first branch flow path. This prevents the flush water from flowing unevenly to the first branch flow path out of the first and second branch flow paths from the pre-branching flow path, which causes flow disturbance. This improves the water supply performance from the water supply device having the flow path branching portion.

[0007] In one embodiment of the present invention, preferably, the water supply device further includes a first on-off valve provided in the first branch flow path and opening and closing the first branch flow path, and a second on-off valve provided in the second branch flow path and opening and closing the second branch flow path, wherein the first pressure valve is provided upstream of the first on-off valve, and the second pressure valve is provided upstream of the second on-off valve. According to one embodiment of the present invention configured as described above, the first pressure valve is provided upstream of the first on-off valve, and the second pressure valve is provided upstream of the second on-off valve. This makes it possible to suppress disturbances in the flow of wash water upstream of the first on-off valve and the second on-off valve, making it easier to regulate the flow of wash water, and further reducing the possibility that disturbances in the flow of wash water will affect the opening and closing operations of the first on-off valve and the second on-off valve.

[0008] In one embodiment of the present invention, the flush toilet side flow path preferably has an opening that is open to the atmosphere so as to supply flush water to the bowl portion of the flush toilet. According to one embodiment of the present invention configured in this manner, the flush toilet side flow path has an opening that is open to the atmosphere so as to supply flush water to the bowl section of the flush toilet. This makes it possible to make it difficult for the pressure of the flush water in the first branch flow path to become higher than atmospheric pressure when flush water is supplied to the flush toilet side flow path, while the pressure of the flush water in the second branch flow path connected to the drain valve hydraulic drive section may increase when water is supplied to the drain valve hydraulic drive section. Therefore, when flush water is supplied from the flow path branch section to both the first branch flow path and the second branch flow path at the same time, a flush water pressure difference between the second branch flow path and the first branch flow path may occur. In contrast, according to the structure of one embodiment of the present invention, the pressure of the flush water in the second branch flow path is adjusted by the second pressure valve and the pressure of the flush water in the first branch flow path is adjusted by the first pressure valve, so that an increase in the flush water pressure difference between the second branch flow path and the first branch flow path can be further suppressed. Therefore, it is possible to suppress the flush water from flowing from the pre-branch flow path to the first branch flow path out of the first branch flow path and the second branch flow path, which causes a turbulent flow.

[0009] In one embodiment of the present invention, preferably, at least one of the first pressure valve and the second pressure valve is configured by a constant flow valve. According to one embodiment of the present invention configured as described above, at least one of the first pressure valve and the second pressure valve is configured as a constant flow valve, and the pressure of the cleaning water in the flow path can be adjusted by the constant flow valve, and the flow rate of the cleaning water can be further stabilized by the constant flow valve. Therefore, it is possible to further suppress the cleaning water from flowing unevenly toward the first branch flow path out of the first branch flow path and the second branch flow path at the flow path branching portion, causing flow disturbance.

[0010] In one embodiment of the present invention, preferably, at least one of the first pressure valve and the second pressure valve is configured by a pressure regulating valve. According to one embodiment of the present invention configured as described above, at least one of the first pressure valve and the second pressure valve is configured as a pressure regulating valve, and the pressure fluctuation of the cleaning water in the flow path can be suppressed by the pressure regulating valve. Therefore, it is possible to further suppress the cleaning water from flowing from the pre-branch flow path toward the first branch flow path out of the first branch flow path and the second branch flow path, causing a disturbance in the flow.

[0011] In one embodiment of the present invention, the first pressure valve is preferably configured by a constant flow valve, and the second pressure valve is preferably configured by a pressure regulating valve. According to one embodiment of the present invention configured as described above, the first pressure valve is configured as a constant flow valve, and the second pressure valve is configured as a pressure adjustment valve. Fluctuations in pressure of the wash water in the first branch flow path can be suppressed by the constant flow valve, and the flow rate of the wash water can be further stabilized by the constant flow valve, while fluctuations in pressure of the wash water in the second branch flow path can be suppressed by the pressure adjustment valve. Therefore, it is possible to further suppress the wash water from flowing from the pre-branch flow path to the first branch flow path out of the first and second branch flow paths, causing turbulence in the flow.

[0012] Moreover, one embodiment of the present invention is a flush toilet device characterized by having a flush toilet and a flush water tank device that can suppress the occurrence of flow disturbances at a flow path branching portion of the water supply device. Effect of the Invention

[0013] According to the present invention, it is possible to provide a flush water tank apparatus that can prevent flow disturbances from occurring at the flow path branching point of the water supply apparatus, and a flush toilet apparatus equipped with the same. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view showing an entire flush toilet device according to an embodiment of the present invention. [Diagram 2] 1 is a full cross-sectional view of a flush toilet device according to an embodiment of the present invention. [Diagram 3] 1 is a cross-sectional view showing the schematic configuration of a flush water tank apparatus according to an embodiment of the present invention. [Figure 4] 1 is a perspective view showing the internal structure of a flush water tank assembly according to one embodiment of the present invention with the lid of the flush water tank assembly removed; [Diagram 5] 1 is a side view showing a flush water tank apparatus according to one embodiment of the present invention with the lid removed. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Next, a flush water tank device and a flush toilet device including the same according to one embodiment of the present invention will be described with reference to the attached drawings. The embodiments of the present disclosure are described as examples, and it will be apparent to those skilled in the art that many modifications, changes, and substitutions can be made within the spirit and scope of the present invention. Therefore, the present invention is not limited to the disclosed embodiments, and various modifications, changes, etc. can be made in form and details without departing from the scope of the claims. Fig. 1 is a perspective view showing the entire flush toilet apparatus according to one embodiment of the present invention. Fig. 2 is a full cross-sectional view of the flush toilet apparatus according to one embodiment of the present invention. Fig. 3 is a cross-sectional view showing the schematic configuration of a flush water tank device according to one embodiment of the present invention.

[0016] As shown in Figures 1 to 3, a flush toilet apparatus 1 according to one embodiment of the present invention comprises a flush toilet main body 2 and a flush water tank apparatus 4 according to one embodiment of the present invention placed at the rear of it. The flush water tank apparatus 4 is configured to supply flush water to the flush toilet main body 2. The flush toilet apparatus 1 of this embodiment is configured so that after use, the bowl portion 2a of the flush toilet main body 2 is flushed by operating a lever handle 8 provided on the flush water tank apparatus 4. The flush water tank apparatus 4 of this embodiment is configured to supply flush water stored internally and flush water supplied from the water supply source C to the flush toilet main body 2 based on operation of the lever handle 8, and to flush the bowl portion 2a with this flush water.

[0017] As a modified example, the present invention can be configured so that the bowl portion 2a is flushed by operating a remote control device (not shown) attached to a wall. Alternatively, the present invention can be configured so that the bowl portion 2a is flushed when a predetermined time has elapsed after a human presence sensor (not shown) provided on the toilet seat detects that the user has left the seat. In this case, the human presence sensor (not shown) can be provided on the toilet seat, or in a position where it can detect the user's sitting down, leaving the seat, approaching, leaving, or waving of a hand, and can be provided, for example, on the flush toilet main body 2 or the flush water tank device 4. The human presence sensor (not shown) may be any sensor that can detect the user's sitting down, leaving the seat, approaching, leaving, or waving of a hand, and for example, an infrared sensor or a microwave sensor can be used as the human presence sensor.

[0018] Next, as shown in Figure 2, the flush water tank device 4 comprises a storage tank 10, which is the flush water tank main body that stores the flush water to be supplied to the flush toilet body 2, a drain valve 12 for opening and closing a drain outlet 10a provided in this storage tank 10, a drain valve hydraulic drive unit 14, which is a hydraulic drive mechanism that drives this drain valve 12, and a water supply device 16 that supplies flush water from a water supply source. Here, flush water stored in water storage tank 10 and discharged by opening drain valve 12 is configured to be discharged from jet outlet 2b, a lower outlet located below the water level W of bowl portion 2a of flush toilet body 2, during toilet flushing. Also, flush water supplied from water supply C and supplied via toilet body side water supply valve 19 is configured to be discharged from rim outlet 2d, an upper outlet located in rim portion 2c of bowl portion 2a, above the water level W of bowl portion 2a, during toilet flushing.

[0019] The water storage tank 10 is a tank configured to store flush water to be supplied to the jet outlet 2b of the flush toilet body 2, and a drain outlet 10a is formed at the bottom of the tank to discharge the stored flush water into the flush toilet body 2. An overflow pipe 10b is also connected to the downstream side of the drain outlet 10a inside the water storage tank 10. This overflow pipe 10b rises vertically from near the drain outlet 10a and extends above the stop water level L1 of the flush water stored in the water storage tank 10. Therefore, flush water that flows in from the upper end of the overflow pipe 10b bypasses the drain outlet 10a and flows out directly from the jet outlet 2b of the flush toilet body 2.

[0020] The drain valve 12 opens and closes the drain outlet 10a to start and stop the supply of flush water to the flush toilet body 2. The drain valve 12 is a direct acting valve body arranged to move up and down above the drain outlet 10a, and is opened when the drain valve 12 is pulled upward, causing the flush water in the water storage tank 10 to be discharged into the flush toilet body 2 and then discharged from the jet outlet 2b provided at the bottom of the bowl portion 2a.

[0021] The drain valve hydraulic drive unit 14 is configured to drive the drain valve 12 using the water supply pressure of flush water supplied from the waterworks C. Specifically, the drain valve hydraulic drive unit 14 has a cylinder 14a into which water supplied from the tank side water supply valve 18 flows, a piston 14b slidably arranged in the cylinder 14a, and a rod 15 protruding from the lower end of the cylinder 14a to drive the drain valve 12. Furthermore, a spring 14c is arranged inside the cylinder 14a to urge 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. In addition, a clutch mechanism 22 is provided in the middle of the rod 15, and the clutch mechanism 22 separates the rod 15 into an upper rod 15a and a lower rod 15b.

[0022] The cylinder 14a is a cylindrical member that is disposed with its axis oriented vertically and that slidably receives the piston 14b inside. An inlet pipe 23 is connected to the lower end of the cylinder 14a, and water flowing out from the tank-side water supply valve 18 flows into the cylinder 14a. Therefore, the piston 14b in the cylinder 14a is pushed up against the biasing force of the spring 14c by the water that has flowed into the cylinder 14a.

[0023] 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 of the cylinder 14a. Then, when the piston 14b is pushed up to a position above the outflow hole, the water that has flowed into the cylinder 14a flows out from the outflow hole through the outflow pipe 24. That is, when the piston 14b moves upward, the inflow pipe 23 and the outflow pipe 24 are communicated through the inside of the cylinder 14a.

[0024] Also, a branch portion 24a is provided in the outflow pipe 24, and a first downcomer pipe 24b that branches downward from this branch portion 24a opens downward above the overflow pipe 10b. Also, a second downcomer pipe 24c that extends roughly horizontally from the branch portion 24a and then curves downward causes water to flow out into the water storage tank 10. Therefore, a portion of the flush water that flows out from the cylinder 14a flows into the overflow pipe 10b, and the remaining flush water is stored in the water storage tank 10.

[0025] Rod 15 is a rod-shaped member connected to the underside of piston 14b, and extends through through-hole 14f formed in the bottom surface of cylinder 14a so as to protrude downward from within cylinder 14a. Drain valve 12 is connected to the lower end of rod 15, and rod 15 connects piston 14b and drain valve 12. Therefore, when water flows into cylinder 14a and piston 14b is pushed up, rod 15 connected to piston 14b lifts drain valve 12 upward, and drain valve 12 opens.

[0026] Furthermore, 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 some of the water that flows into the cylinder 14a flows out from this gap 14d. The water that flows out from the gap 14d flows into the water storage tank 10. Note that since this gap 14d is relatively narrow and has a large flow resistance, even if water flows out from the gap 14d, the pressure inside the cylinder 14a increases due to the water flowing into the cylinder 14a from the inlet pipe 23, and the piston 14b is pushed up against the biasing force of the spring 14c.

[0027] Furthermore, a clutch mechanism 22 is provided midway along the rod 15. The clutch mechanism 22 is configured to separate the rod 15 into an upper rod 15a and a lower rod 15b when the drain valve 12 is lifted a predetermined distance together with the rod 15. When the clutch mechanism 22 is in a separated state, the lower rod 15b is no longer linked to the movement of the piston 14b and the upper part of the upper rod 15a, and the lower rod 15b, together with the drain valve 12, descends due to gravity while resisting buoyancy.

[0028] Further, a drain valve float mechanism 26 is provided near the drain valve 12. This drain valve float mechanism 26 is configured to delay the closing of the drain port 10a caused by the lower rod 15b and the drain valve 12 descending after the rod 15 is lifted a predetermined distance and the lower rod 15b is separated by the clutch mechanism 22. Specifically, the drain valve float mechanism 26 has a float portion 26a and an engagement portion 26b that interlocks with the float portion 26a.

[0029] The engaging portion 26b is configured to engage with the lower rod 15b that has been released by the clutch mechanism 22 and descends, preventing the lower rod 15b and the drain valve 12 from descending and seating on the drain outlet 10a. Next, the float portion 26a descends as the water level in the water storage tank 10 drops, and when the water level in the water storage tank 10 drops to a predetermined water 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. As a result of the disengagement, the lower rod 15b and the drain valve 12 descend and seat on the drain outlet 10a. This delays the closing of the drain valve 12, allowing an appropriate amount of flush water to be discharged from the drain outlet 10a.

[0030] In addition, a vacuum breaker 30 is provided on the inlet pipe 23 connecting the tank side water supply valve 18 of the water supply device 16 and the drain valve hydraulic drive unit 14. When negative pressure occurs on the tank side water supply valve 18 side, this vacuum breaker 30 allows outside air to be drawn into the inlet pipe 23, preventing backflow of water from the drain valve hydraulic drive unit 14 side.

[0031] Next, the water supply device 16 will be described with reference to Figs. Figure 4 is an oblique view showing the internal structure of a flush water tank apparatus according to one embodiment of the present invention with the lid of the flush water tank apparatus removed, Figure 5 is a side view showing a flush water tank apparatus according to one embodiment of the present invention with the lid removed, Figure 6 is a cross-sectional view taken along line VI-VI in Figure 5, Figure 7 is a cross-sectional view taken along line VII-VII in Figure 5, and Figure 8 is a cross-sectional view taken along line VIII-VIII in Figure 4.

[0032] As shown in Fig. 3, the water supply device 16 is provided between a water supply pipe 32 connected to a water supply C, an inlet pipe 23, and a rim water supply pipe 25. The water supply device 16 includes a flow path branching section 33 that branches a flow path to a tank side water supply valve 18 and a toilet body side water supply valve 19, the tank side water supply valve 18 connected to a second branch flow path 33c of the flow path branching section 33, and the toilet body side water supply valve 19 connected to a first branch flow path 33b of the flow path branching section 33. The water supply device 16 is a type of water supply device that includes a flow path branching section 33 that branches a flow path toward a rim water supply pipe 25 that constitutes a flush toilet side flow path that directly supplies flush water to the flush toilet body 2, and an inlet pipe 23 that constitutes a tank side flow path that supplies water to a drain valve hydraulic drive section 14 in a water storage tank 10. The rim water supply pipe 25 forms a flow path that directly connects the water supply device 16 and the flush toilet body 2, without temporarily storing flush water in the water storage tank 10. The rim water supply pipe 25 has an opening (for example, a rim water outlet 2d) that is open to the atmosphere so as to supply flush water to the bowl part 2a of the flush toilet body 2. The inflow pipe 23 forms a flow path that directly connects the water supply device 16 and the drain valve hydraulic drive part 14 in the water storage tank 10. The inflow pipe 23 constitutes a drain valve hydraulic drive part side flow path that supplies water to the drain valve hydraulic drive part 14. The flow rate per unit time of flush water supplied to the flush toilet body 2 through the rim water supply pipe 25 is made greater than the flow rate per unit time of flush water supplied to the water storage tank 10 through the inflow pipe 23.

[0033] The tank side water supply valve 18 is a second opening / closing valve that controls the water supply to the drain valve hydraulic drive unit 14. The tank side water supply valve 18 is provided in the second branch flow path 33c and opens and closes the second branch flow path 33c. The tank side water supply valve 18 is configured to control the water supply to the drain valve hydraulic drive unit 14 based on the operation of the drain control solenoid valve 20, and to control the supply and stop of water to the water storage tank 10. Next, the tank side water supply valve 18 includes a control valve main body 18a, a main valve body 18b arranged in the control valve main body 18a, and a pilot valve 18c. Furthermore, the tank side water supply valve 18 is connected to the drain control solenoid valve 20 connected to the solenoid valve side pilot valve 18c.

[0034] The drain control solenoid valve 20 is configured to move the solenoid valve side pilot valve 18c built into the tank side water supply valve 18 based on a signal sent from the controller 28, and open and close a pilot valve port (not shown). When the pilot valve port (not shown) is opened, the pressure in the pressure chamber provided in the control valve main body 18a decreases, and the main valve body 18b of the tank side water supply valve 18 is opened. When the pilot valve port (not shown) is closed, the pressure in the pressure chamber increases, and the main valve body 18b is closed. As a result, the main valve body 18b of the tank side water supply valve 18 is opened and closed based on the operation of the drain control solenoid valve 20, and the supply and stop of water to the drain valve water pressure drive unit 14 is controlled. In this embodiment, a bistable latching type solenoid is used as the drain control solenoid valve 20, in which the solenoid valve side pilot valve 18c is moved by applying current once, and the state is maintained even when the current is stopped. In this type of solenoid valve, when current is again applied in the opposite direction, the solenoid valve side pilot valve 18c can be returned to its original position.

[0035] The flush water tank device 4 further includes a float switch 34 provided on the wall surface inside the water storage tank 10. The float switch 34 functions as a water level sensor that detects the water level. The float switch 34 is electrically connected to the controller 28. When the water level inside the water storage tank 10 rises to the stop water level L1, the float switch 34 notifies the controller 28 that the water level has reached the stop water level L1. When the water level inside the water storage tank 10 falls below the stop water level L1, the float switch 34 notifies the controller 28 that the water level has fallen from the stop water level L1 to below the stop water level L1. When the float switch 34 detects that the water level has reached the stop water level L1, the controller 28 operates the solenoid valve side pilot valve 18c via the drain control solenoid valve 20, closes the pilot valve port (not shown), closes the main valve body 18b, and stops the supply of water to the water storage tank 10.

[0036] Incidentally, when the flush water tank device 4 is in a standby state, the storage tank 10 is at the stop water level L1, and in this state, the pilot valve port (not shown) that is opened and closed by the pilot valve 18c is closed. Therefore, during flushing, the pilot valve port (not shown) can be opened and the main valve body 18b of the tank-side water supply valve 18 can be opened by moving the solenoid valve-side pilot valve 18c based on the operation of the drainage control solenoid valve 20. Specifically, the controller 28 receives a signal from the lever handle 8, and the controller 28 sends an electric signal to the drainage control solenoid valve 20 to operate it and open the tank-side water supply valve 18.

[0037] That is, the tank side water supply valve 18 controls the supply and stop of the supplied flush water to the drain valve hydraulic drive unit 14 based on an instruction signal from the controller 28, which is the control unit. In this embodiment, the entire amount of flush water flowing out from the tank side water supply valve 18 is supplied to the drain valve hydraulic drive unit 14 through the inlet pipe 23. A portion of the flush 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 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 of the cylinder 14a through the outlet pipe 24 and flows into the overflow pipe 10b and the water storage tank 10, as described above.

[0038] The toilet body side water supply valve 19 is a first opening and closing valve that supplies flush water supplied from the water supply C directly to the flush toilet body 2. It is provided in the first branch flow path 33b and opens and closes the first branch flow path 33b. The toilet body side water supply valve 19 is configured to allow water supplied from the first branch flow path 33b to flow out to the rim water supply pipe 25. The rim water supply pipe 25 extends to the outside of the water storage tank 10 and communicates with the rim water outlet 2d of the flush toilet body 2 (not shown in FIG. 3), and the flush water that flows into the rim water supply pipe 25 is discharged from the rim water outlet 2d as rim flush water for cleaning the bowl section 2a. In addition, a vacuum breaker 31 is provided in the middle of the rim water supply pipe 25. This makes it possible to prevent water from flowing back from the flush toilet body 2 side to the toilet body side water supply valve 19 when negative pressure occurs on the toilet body side water supply valve 19 side.

[0039] The toilet body water supply valve 19 includes a water supply valve main body 19a, a main valve body 19b arranged in the water supply valve main body 19a, and a solenoid valve pilot valve 19c. A water supply control solenoid valve 21 is connected to the toilet body water supply valve 19, and the solenoid valve pilot valve 19c is moved by the water supply control solenoid valve 21. That is, the solenoid valve pilot valve 19c is configured to control the pressure in a pressure chamber provided in the water supply valve main body 19a by opening and closing a pilot valve port (not shown) provided in the water supply valve main body 19a. When the pilot valve port (not shown) is opened, the pressure in the pressure chamber provided in the water supply valve main body 19a decreases, and the main valve body 19b of the toilet body water supply valve 19 is opened. When the pilot valve port (not shown) is closed, the pressure in the pressure chamber increases, and the main valve body 19b is closed. As a result, the main valve body 19b of the toilet body-side water supply valve 19 is opened and closed based on the operation of the water supply control solenoid valve 21, and the supply and stop of water to the flush toilet body 2 is controlled.

[0040] Meanwhile, flush water supplied from water supply C is supplied via stop valve 32a, constant flow valve 32b, and a flow path branch to tank-side water supply valve 18 or toilet body-side water supply valve 19. Stop valve 32a is disposed outside water storage tank 10, and constant flow valve 32b is connected downstream of stop valve 32a, inside water storage tank 10. Flow path branch 33 is provided downstream of constant flow valve 32b.

[0041] Stopcock 32a is provided to stop the supply of water to flush water tank apparatus 4 during maintenance and the like, and is normally used in the open state. Constant flow valve 32b is provided to allow water supplied from water supply C to flow into water supply apparatus 16 at a predetermined flow rate, and is configured so that a constant flow rate of water is supplied to water supply apparatus 16 regardless of the installation environment of flush toilet apparatus 1.

[0042] The flow path branch section 33 is formed to branch the flow path toward the rim water supply pipe 25 constituting the flush toilet side flow path that directly supplies flush water to the flush toilet body 2, and the inflow pipe 23 constituting the tank side flow path that supplies water to the water storage tank 10. The flow path branch section 33 comprises a pre-branch flow path 33a connected to the water supply source side flow path extending from the water supply source, a first branch flow path 33b connected to the rim water supply pipe 25 constituting the flush toilet side flow path, and a second branch flow path 33c connected to the inflow pipe 23 constituting the drain valve hydraulic drive unit side flow path. The second branch flow path 33c is connected to the drain valve hydraulic drive unit 14 via the inflow pipe 23, while the first branch flow path 33b is open to the atmosphere on the flush toilet body 2 side via the rim water supply pipe 25, so that the pressure of the flush water in the second branch flow path 33c is relatively often higher than the pressure of the flush water in the first branch flow path 33b.

[0043] The first branch flow passage 33b is connected at one end to the toilet body side water supply valve 19, and is further connected to the rim water supply pipe 25 via the toilet body side water supply valve 19. The first branch flow passage 33b is a pipe-like flow passage formed in the water supply device 16. The first branch flow passage 33b extends horizontally from the downstream end of the pre-branch flow passage 33a, then bends upward and extends vertically. The central axis B1 of the first branch flow passage 33b of the flow passage branching portion 33 is disposed at a position offset from the central axis B2 of the pre-branch flow passage 33a. The angle formed by the central axis B1 of the first branch flow passage 33b and the central axis B2 of the pre-branch flow passage 33a is 90°. The central axis B2 of the branch portion of the pre-branch flow passage 33a and the central axis B3 of the inlet portion of the second specific flow passage portion 33e are disposed on the same line.

[0044] One end of the second branch flow path 33c is connected to the tank side water supply valve 18, and is further connected to the inlet pipe 23 via the tank side water supply valve 18. The second branch flow path 33c is a piping-like flow path formed in the water supply device 16. The second branch flow path 33c extends vertically from the downstream end of the pre-branch flow path 33a.

[0045] The water supply device 16 further includes a first pressure valve 38 provided in the first branch flow path 33b and adjusting the pressure of the cleaning water in the first branch flow path 33b, and a second pressure valve 40 provided in the second branch flow path 33c and adjusting the pressure of the cleaning water in the second branch flow path 33c.

[0046] The first pressure valve 38 is provided upstream of the toilet body side water supply valve 19. The first pressure valve 38 may be provided downstream of the toilet body side water supply valve 19. The second pressure valve 40 is provided upstream of the tank side water supply valve 18. The second pressure valve 40 may be provided downstream of the tank side water supply valve 18.

[0047] The first pressure valve 38 is configured as a constant flow valve that allows cleaning water to flow at a predetermined flow rate, and the second pressure valve 40 is configured as a pressure regulating valve that can adjust the pressure of the cleaning water in the flow path. At least one of the first pressure valve 38 and the second pressure valve 40 may be configured as a constant flow valve that allows cleaning water to flow at a predetermined flow rate. At least one of the first pressure valve 38 and the second pressure valve 40 may be configured as a pressure regulating valve that can adjust the pressure of the cleaning water in the flow path. The first pressure valve 38 and / or the second pressure valve 40 are electrically connected to the controller 28 if necessary. The first pressure valve 38 and / or the second pressure valve 40 may be other valves that can adjust the pressure of the cleaning water, such as a relief valve or a pressure reducing valve.

[0048] 8, when the downstream end portion of the pre-branch flow path 33a extends along the specific direction D1, the second pressure valve 40 is provided on the second specific flow path portion 33e extending in the specific direction D1 in the second branch flow path 33c. The first pressure valve 38 is provided on the first specific flow path portion 33d extending in the specific direction D1 in the first branch flow path 33b. The specific direction D1 is a specific direction in which the pre-branch flow path 33a extends in the flow path branching portion 33, and is the direction in which the central axis B2 extends. In this embodiment, the specific direction D1 is a vertical direction.

[0049] Returning to this embodiment, the explanation will be given again. The controller 28 incorporates a CPU, a memory, an interface circuit, etc., and can control other devices electrically connected thereto based on a predetermined control program, etc. For example, the controller 28 incorporates a circuit board, and is configured to control the drain control solenoid valve 20, the water supply control solenoid valve 21, etc., based on the operation of the lever handle 8. The controller 28 is electrically connected to the lever handle 8, the drain control solenoid valve 20, the water supply control solenoid valve 21, the float switch 34, etc., and can mutually transmit and receive electrical signals, so that each part can be electrically operated.

[0050] The controller 28 sends a control signal to the drain control solenoid valve 20 to move the solenoid valve side pilot valve 18c. When the pilot valve port (not shown) of the control valve main body 18a is opened by the solenoid valve side pilot valve 18c, the pressure in the pressure chamber in the control valve main body 18a decreases, the main valve body 18b is moved, and the tank side water supply valve 18 is opened. As a result, flush water supplied from the water supply pipe 32 flows out from the tank side water supply valve 18 to the drain valve water pressure drive unit 14, and is supplied to the water storage tank 10 via the drain valve water pressure drive unit 14.

[0051] In addition, the controller 28 sends a control signal to the water supply control solenoid valve 21 to move the solenoid valve pilot valve 19c. When the pilot valve port (not shown) of the water supply valve main body 19a is opened by the solenoid valve pilot valve 19c, the pressure in the pressure chamber inside the water supply valve main body 19a decreases, the main valve body 19b is moved, and the toilet body-side water supply valve 19 is opened. As a result, flush water supplied from the water supply pipe 32 flows out from the toilet body-side water supply valve 19 to the rim water supply pipe 25 and is discharged from the rim water outlet 2d of the flush toilet main body 2.

[0052] Next, the operation of the flush water tank apparatus 4 according to one embodiment of the present invention, and the flush toilet apparatus 1 equipped with it, will be described with reference to Figures 3, 8, etc.

[0053] First, in the toilet flush standby state as shown in Fig. 3, the water level in the water storage tank 10 is at the stop water level L1, and no current is applied to the drain control solenoid valve 20 and the water supply control solenoid valve 21. In this state, the pilot valve port (not shown) opened and closed by the solenoid valve pilot valve 18c is closed. As a result, the main valve body 18b of the tank side water supply valve 18 is in a closed state. In addition, the pilot valve port (not shown) opened and closed by the solenoid valve pilot valve 19c is also closed, and the main valve body 19b of the toilet body side water supply valve 19 is also in a closed state.

[0054] Next, when the user operates the lever handle 8 (Fig. 1), a signal commanding toilet flushing is sent to the controller 28 (Fig. 3). Upon receiving the command signal for toilet flushing, the controller 28 energizes the water supply control solenoid valve 21, opening the solenoid valve pilot valve 19c of the toilet body side water supply valve 19. This reduces the pressure in the pressure chamber of the toilet body side water supply valve 19, causing the main valve body 19b to lift off the valve seat and open. In this embodiment, a bistable latching solenoid is used as the water supply control solenoid valve 21, so once the solenoid valve pilot valve 19c is opened, it remains open even if the power supply is stopped.

[0055] When the toilet body water supply valve 19 is opened, tap water supplied to the toilet body water supply valve 19 from the water supply pipe 32 via the flow path branch 33 and the first branch flow path 33b flows through the toilet body water supply valve 19 into the rim water supply pipe 25. The flush water that flows into the rim water supply pipe 25 is discharged from the rim water outlet 2d (Figure 2) of the flush toilet body 2, and the rim flush water begins flushing the bowl portion 2a.

[0056] After energizing the water supply control solenoid valve 21, the controller 28 energizes the drain control solenoid valve 20 after a predetermined time has elapsed, causing the solenoid valve pilot valve 18c to be lifted from the pilot valve port (not shown). This reduces the pressure in the pressure chamber of the tank side water supply valve 18, causing the main valve body 18b to be lifted from the valve seat and opened. That is, after opening the toilet body side water supply valve 19, the controller 28 opens the tank side water supply valve 18 while maintaining the toilet body side water supply valve 19 in an open state. In this embodiment, since a bistable latching solenoid is used as the drain control solenoid valve 20, once the solenoid valve side pilot valve 18c is opened, the open state is maintained even if energization is stopped. When the tank side water supply valve 18 is opened, tap water supplied to the tank side water supply valve 18 from the water supply pipe 32 via the flow path branch 33 and the second branch flow path 33c flows into the inlet pipe 23 through the tank side water supply valve 18.

[0057] Furthermore, the flush water that has flowed into the inlet pipe 23 flows into the cylinder 14a of the drain valve hydraulic drive unit 14, pushing up the piston 14b. This also pulls up the rod 15 and the drain valve 12 connected to the piston 14b, and the drain port 10a is opened. This causes the flush water stored in the water storage tank 10 to flow out through the drain port 10a and be discharged from the jet water outlet 2b (FIG. 2) provided at the bottom of the bowl section 2a. The flush water discharged from the jet water outlet 2b fills the drain trap pipe 2e extending from the bottom of the bowl section 2a, inducing a siphon effect. Due to the siphon effect, the accumulated water and waste in the bowl section 2a are discharged through the drain trap pipe 2e. In this way, by opening the drain port 10a, flush water is discharged from both the rim water outlet 2d and the jet water outlet 2b at the same time.

[0058] Next, the flow of wash water passing through the first pressure valve 38 and the second pressure valve 40 will be described. 8, in the flow path branching section 33, the first pressure valve 38 can suppress an increase in pressure of the wash water flowing from the pre-branching flow path 33a through the first branching flow path 33b, and can suppress the occurrence of turbulence in the flow. Also, in the flow path branching section 33, the second pressure valve 40 can suppress an increase in pressure of the wash water flowing from the pre-branching flow path 33a through the second branching flow path 33c, and can suppress the occurrence of turbulence in the flow.

[0059] Also, for example, when flush water is supplied simultaneously from the water supply pipe 32 to both the first branch flow path 33b and the second branch flow path 33c at the flow path branch section 33, the flow rate per unit time of flush water that the water supply device 16 supplies directly through the rim water supply pipe 25 for flushing the flush toilet body 2 is greater than the flow rate per unit time of flush water supplied to the water storage tank 10 through the inlet pipe 23, and the flow rate per unit time of flush water supplied through the first branch flow path 33b is greater than the flow rate per unit time of flush water supplied through the second branch flow path 33c.

[0060] In the flow path branching section 33, when water is supplied from the pre-branch flow path 33a through the second branch flow path 33c to the drain valve hydraulic drive section 14, the pressure of the wash water in the second branch flow path 33c connected to the drain valve hydraulic drive section 14 may increase. In such a case, it becomes difficult for the wash water to flow from the pre-branch flow path 33a into the second branch flow path 33c, and the wash water is likely to stagnate at the inlet portion to the second branch flow path 33c. In such a case, the second pressure valve 40 can be adjusted to suppress the increase in the pressure of the wash water in the second branch flow path 33c, and disturbances in the flow of the wash water in the flow path branching section 33 can be suppressed.

[0061] Furthermore, for example, when cleaning water is supplied from the flow path branching section 33 to both the first branch flow path 33b and the second branch flow path 33c at the same time, the pressure of the cleaning water in the second branch flow path 33c can be adjusted by the second pressure valve 40 and the pressure of the cleaning water in the first branch flow path 33b can be adjusted by the first pressure valve 38, thereby suppressing an increase in the pressure difference between the cleaning water in the second branch flow path 33c and the first branch flow path 33b.

[0062] In addition, for example, when the water pressure in the drain valve hydraulic drive unit 14 changes while water is being supplied from the pre-branch flow path 33a via the second branch flow path 33c, for example when the piston 14b moves to the top and the outflow pipe 24 is opened, or when the clutch mechanism 22 is disconnected, the second pressure valve 40 can be adjusted to suppress increases and fluctuations in the pressure of the cleaning water in the second branch flow path 33c, thereby preventing disturbances in the flow of cleaning water at the flow path branch section 33.

[0063] The configuration of the first pressure valve 38 and the second pressure valve 40 can prevent the occurrence of an event in which the branched cleaning water flows biasedly into the first branch flow path 33b out of the first branch flow path 33b and the second branch flow path 33c, compared to the expected prescribed distribution amount, due to an increase in the pressure difference of the cleaning water between the second branch flow path 33c and the first branch flow path 33b, or a disturbance in the flow of the cleaning water in the flow path branch section 33. More specifically, it can prevent the occurrence of a bias in the flow rate, for example, in which a flow rate greater than the prescribed flow rate intended to pass through the first branch flow path 33b flows into the first branch flow path 33b, and a flow rate less than the prescribed flow rate intended to pass through the second branch flow path 33c flows into the second branch flow path 33c. As described above, this embodiment is not limited to the case where cleaning water is supplied simultaneously from the water supply pipe 32 to both the first branch flow path 33b and the second branch flow path 33c at the flow path branching portion 33, but can suppress disturbances in the flow of cleaning water at the flow path branching portion 33 when cleaning water is supplied only to the second branch flow path 33c from the flow path branching portion.

[0064] In this way, the cleaning water supplied from the pre-branch flow path 33a can be easily branched at the flow path branching section 33 into a flow at a predetermined flow rate flowing into the first branch flow path 33b and a flow at a predetermined flow rate flowing into the second branch flow path 33c, even if the cleaning water is supplied to two flow paths at the same time.

[0065] Next, the continuation of the operation of the flush water tank device 4 etc., from the operation in which the flush water that has flowed into the inflow pipe 23 flows into the drain valve water pressure drive section 14 will be explained again. When the piston 14b is pushed up in the drain valve hydraulic drive unit 14, and the rod 15 and drain valve 12 are raised to a predetermined position, the clutch mechanism 22 separates the lower rod 15b and drain valve 12 from the upper rod 15a. As a result, while the tank side water supply valve 18 is open, the upper rod 15a remains pushed up together with the piston 14b, while the lower rod 15b and drain valve 12 descend under their own weight. However, the separated lower rod 15b engages with the engagement portion 26b of the drain valve float mechanism 26, preventing the lower rod 15b and drain valve 12 from descending. As a result, the drain port 10a of the water storage tank 10 remains open even after the clutch mechanism 22 is separated, and drainage from the water storage tank 10 continues.

[0066] Furthermore, when flush 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 top of the cylinder 14a, the flush water in the cylinder 14a flows out through the outflow pipe 24. Furthermore, part of the water that flows into the cylinder 14a from the inflow pipe 23 flows out from the gap 14d 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. Meanwhile, part of the flush water that flows out through the outflow pipe 24 flows into the overflow pipe 10b, and the remaining flush water flows into the water storage tank 10. That is, part of the flush water that flows out from the drain valve hydraulic drive unit 14 flows into the water storage tank 10, and the remaining flush water that flows into the overflow pipe 10b bypasses the drain valve 12 and flows into the flush toilet body from the jet spout 2b. Furthermore, since the flow rate of flushing water flowing into the water storage tank 10 through the outflow pipe 24 is less than the flow rate of flushing water discharged from the drain outlet 10a when the drain valve 12 is opened, the water level in the water storage tank 10 drops in this state.

[0067] Next, when the flush water in the water storage tank 10 is discharged and the water level in the water storage tank 10 drops, the float switch 34 goes into a state where it is not detecting the water level. As a result, the controller 28 controls the drain control solenoid valve 20 so that the solenoid valve side pilot valve 18c is kept unseated from the pilot valve port. The tank side water supply valve 18 is maintained open.

[0068] Next, when the flush water in the water storage tank 10 is discharged from the drain outlet 10a and the water level in the water storage tank 10 drops to a predetermined level, the float portion 26a of the drain valve float mechanism 26 descends, which moves the engagement portion 26b. This releases the engagement between the lower rod 15b and the engagement portion 26b, and the lower rod 15b and the drain valve 12 begin to descend again. Then, after a predetermined time has elapsed, the drain outlet 10a of the water storage tank 10 is closed by the drain valve 12, and the discharge of the flush water that has flowed out of the drain outlet 10a from the jet water outlet 2b is stopped.

[0069] Furthermore, since the tank-side water supply valve 18 remains open even after the drain outlet 10a is closed, water supplied from the water supply pipe 32 flows into the drain valve hydraulic actuator 14 and flows out into the outflow pipe 24. A portion of the flush water that flows out of the outflow pipe 24 flows into the overflow pipe 10b through the first downcomer pipe 24b. Therefore, even after the drain outlet 10a is closed, the flush water that flows into the overflow pipe 10b flows into the bowl section 2a at a small flow rate through the jet spout 2b, and the inflowing flush water is used as refill water. Also, a remaining portion of the flush water that flows out of the outflow pipe 24 flows into the water storage tank 10 through the second downcomer pipe 24c, so the water level in the water storage tank 10 rises.

[0070] Furthermore, after a predetermined time has elapsed since the start of flushing, the controller 28 sends a control signal to the water supply control solenoid valve 21 to close the solenoid valve pilot valve 19c of the toilet body side water supply valve 19. This stops water discharge from the rim water outlet 2d of the flush toilet body 2. After jet water discharge ends, the flush water discharged from the rim water outlet 2d also flows into the bowl section 2a and is used as refill water. Even after the toilet body side water supply valve 19 is closed, the tank side water supply valve 18 remains open, and the flush water that has passed through the drain valve hydraulic drive section 14 and flowed from the first downcomer pipe 24b into the overflow pipe 10b is used to refill the bowl section 2a.

[0071] Next, when the water level in the water storage tank 10 rises to a predetermined water stop water level L1, the float switch 34 detects the water level, and the controller 28 controls the drain control solenoid valve 20 to move the solenoid valve pilot valve 18c to close the pilot valve port. This causes the pressure in the pressure chamber in the control valve main body 18a to rise, closing the main valve body 18b and closing the tank side water supply valve 18. As a result, water supply to the water storage tank 10 is stopped. As a modified example, the present invention can be configured so that the toilet body side water supply valve 19 is kept open until the tank side water supply valve 18 is closed, and the toilet body side water supply valve 19 is closed after the tank side water supply valve 18 is closed. As another modified example, the float switch 34 may not be provided, and the controller 28 may control the drain control solenoid valve 20 to move the solenoid valve side pilot valve 18c and close the pilot valve port after a predetermined time has elapsed since the start of cleaning in response to receipt of an operation signal from the lever handle 8. As yet another modified example, a mechanical float device may be provided instead of the float switch 34, and the float side pilot valve may be moved to close or open the pilot valve port by detecting the water level of the mechanical float device.

[0072] On the other hand, when the tank-side water supply valve 18 is closed to stop the supply of water to the drain valve hydraulic drive unit 14, the piston 14b of the drain valve hydraulic drive unit 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 lower rod 15b, which had been separated by the clutch mechanism 22, are reconnected. Therefore, the next time a toilet flush is performed, both the upper rod 15a and the lower rod 15b are pulled up by the piston 14b. This completes one toilet flush and the flush toilet device returns to its standby state for toilet flushing.

[0073] According to the flush water tank device 4 according to the embodiment of the present invention described above, the second branch flow path 33c of the flow path branch section 33 of the water supply device 16 is connected to the flow path on the side of the drain valve hydraulic drive section 14, which is connected to the drain valve hydraulic drive section 14. Normally, the drain valve hydraulic drive section 14 requires a relatively large flush water pressure to drive the drain valve. This may cause the pressure of the flush water in the second branch flow path 33c connected to the flow path on the side of the drain valve hydraulic drive section 14 to increase or fluctuate. Also, when either the first branch flow path 33b or the second branch flow path 33c is open, more water pressure than necessary is generated for flush water, and for example, when only the first branch flow path 33b connected to the flow path on the flush toilet side is open, there is a possibility that the flush water will splash out from the opening on the flush toilet side. In response to this, the first pressure valve can suppress the increase or fluctuation in the pressure of the flush water in the first branch flow path 33b. In addition, when flush water is supplied from the flow path branching section 33 to the second branch flow path 33c, the second pressure valve 40 can suppress the increase and fluctuation of the pressure of the flush water in the second branch flow path 33c. Therefore, it is possible to suppress the flush water from flowing unevenly to the first branch flow path 33b or the second branch flow path 33c due to an increase in pressure in the flow path branching section 33, causing a disturbance in the flow in the flow path branching section 33. This improves the water supply performance from the water supply device 16 equipped with the flow path branching section 33. In addition, for example, when flush water is supplied from the pre-branching flow path 33a to both the first branch flow path 33b and the second branch flow path 33c at the same time, the pressure of the flush water in the second branch flow path 33c is adjusted by the second pressure valve 40 and the pressure of the flush water in the first branch flow path 33b is adjusted by the first pressure valve 38, thereby suppressing an increase in the pressure difference between the flush water in the second branch flow path 33c and the first branch flow path 33b. Therefore, it is possible to prevent flush water from flowing from the pre-branch flow path 33a toward the first branch flow path 33b out of the first branch flow path 33b and the second branch flow path 33c, which would cause turbulence in the flow. Therefore, it is possible to improve the water supply performance from the water supply device 16 equipped with the flow path branch section 33.

[0074] Furthermore, with flush water tank apparatus 4 according to one embodiment of the present invention, the first pressure valve 38 is provided upstream of the toilet body side water supply valve 19, and the second pressure valve 40 is provided upstream of the tank side water supply valve 18. This makes it possible to suppress turbulence in the flow of flush water upstream of the toilet body side water supply valve 19 and the tank side water supply valve 18, making it easier to regulate the flow of flush water, and further reducing the possibility of turbulence in the flow of flush water affecting the opening and closing operations of the toilet body side water supply valve 19 and the tank side water supply valve 18.

[0075] Furthermore, according to the flush water tank device 4 of one embodiment of the present invention, the rim water supply pipe 25 has an opening that is open to the atmosphere so as to supply flush water to the bowl portion 2a of the flush toilet body 2. As a result, when flush water is supplied to the rim water supply pipe 25, the pressure of the flush water in the first branch flow path 33b is less likely to become higher than atmospheric pressure, while when water is supplied to the drain valve hydraulic drive unit 14, the pressure of the flush water in the second branch flow path 33c connected to the drain valve hydraulic drive unit 14 may increase. Therefore, when flush water is supplied from the flow path branch unit 33 to both the first branch flow path 33b and the second branch flow path 33c at the same time, a flush water pressure difference between the second branch flow path 33c and the first branch flow path 33b may occur. In contrast, according to the structure of one embodiment of the present invention, the pressure of the flush water in the second branch flow path 33c is adjusted by the second pressure valve 40 and the pressure of the flush water in the first branch flow path 33b is adjusted by the first pressure valve 38, so that an increase in the flush water pressure difference between the second branch flow path 33c and the first branch flow path 33b can be further suppressed. Therefore, it is possible to prevent the wash water from flowing from the pre-branch flow path 33a toward the first branch flow path 33b out of the first branch flow path 33b and the second branch flow path 33c, thereby preventing disturbance in the flow.

[0076] Furthermore, according to the flush water tank apparatus 4 according to one embodiment of the present invention, at least one of the first pressure valve 38 and the second pressure valve 40 is configured as a constant flow valve, and the pressure of the flush water in the flow path can be adjusted by the constant flow valve, and the flow rate of the flush water can also be more stabilized by the constant flow valve. Therefore, it is possible to further prevent the flush water from flowing biased toward the first branch flow path 33b out of the first branch flow path 33b and the second branch flow path 33c at the flow path branching section 33, causing turbulence in the flow.

[0077] Furthermore, according to the flush water tank apparatus 4 according to one embodiment of the present invention, at least one of the first pressure valve 38 and the second pressure valve 40 is configured as a pressure regulating valve, and fluctuations in the pressure of the flush water in the flow paths can be suppressed by the pressure regulating valve. Therefore, it is possible to further suppress the flush water from flowing from the pre-branch flow path 33a toward the first branch flow path 33b out of the first branch flow path 33b and the second branch flow path 33c, causing turbulence in the flow.

[0078] Furthermore, according to the flush water tank device 4 according to one embodiment of the present invention, the first pressure valve 38 is configured as a constant flow valve, and the second pressure valve 40 is configured as a pressure adjustment valve. Fluctuations in the pressure of the flush water in the first branch flow path 33b can be suppressed by the constant flow valve, and the flow rate of the flush water can be more stabilized by the constant flow valve, while fluctuations in the pressure of the flush water in the second branch flow path 33c can be suppressed by the pressure adjustment valve. Therefore, it is possible to further suppress the flush water from flowing from the pre-branch flow path 33a toward the first branch flow path 33b out of the first branch flow path 33b and the second branch flow path 33c, causing turbulence in the flow.

[0079] Furthermore, one embodiment of the present invention is a flush toilet device 1, characterized in that it comprises a flush toilet main body 2, and a flush water tank device 4 that can suppress the occurrence of flow disturbances at the flow path branching section 33 of the water supply device 16. [Explanation of symbols]

[0080] 1: Flush toilet device 2:Wash toilet body 2a: Bowl section 4: Cleaning water tank device 10: Water tank 10a: Drain port 12: Drain valve 14: Drain valve hydraulic drive unit 16: Water supply device 24a: Branch 33: Flow path branch 33a: Pre-branch flow channel 33a: Branch channel 33b: First branch channel 33c: Second branch channel 38: First pressure valve 40: Second pressure valve

Claims

1. A flush water tank device that supplies flush water to a flush toilet, a water storage tank for storing flush water to be supplied to the flush toilet and having a drain port for discharging the stored flush water into the flush toilet; a drain valve that opens and closes the drain outlet and starts and stops the supply of flush water to the flush toilet; a drain valve water pressure drive unit that drives the drain valve by utilizing the water supply pressure of the supplied flush water; a water supply device that supplies flush water from a water supply source, the water supply device including a flow path branching section that branches a flow path toward a flush toilet side flow path that directly supplies flush water to the flush toilet, and a drain valve water pressure drive part side flow path that is connected to the drain valve water pressure drive part; The flow path branching portion of the water supply device includes a pre-branch flow path connected to a water supply source side flow path extending from the water supply source, a first branch flow path connected to the flush toilet side flow path, and a second branch flow path connected to the drain valve water pressure drive unit side flow path, The water supply device further includes a first pressure valve provided in the first branch flow path and configured to adjust the pressure of the flush water in the first branch flow path; a second pressure valve provided in the second branch flow path and configured to adjust the pressure of the cleaning water in the second branch flow path; a first on-off valve provided in the first branch flow path and configured to open and close the first branch flow path; a second on-off valve provided in the second branch flow path and configured to open and close the second branch flow path; Equipped with The first pressure valve is provided upstream of the first on-off valve, A flush water tank apparatus, wherein the second pressure valve is provided upstream of the second opening / closing valve.

2. 2. The flush water tank device according to claim 1, wherein the flush toilet side flow path is provided with an opening that is open to the atmosphere so as to supply flush water to a bowl portion of the flush toilet.

3. 3. The flush water tank apparatus according to claim 1, wherein at least one of the first pressure valve and the second pressure valve is configured as a constant flow valve.

4. 4. A flush water tank apparatus according to claim 1, wherein at least one of the first pressure valve and the second pressure valve is constituted by a pressure regulating valve.

5. The first pressure valve is a constant flow valve, 5. A flush water tank apparatus as claimed in claim 1, wherein the second pressure valve is constituted by a pressure regulating valve.

6. A flush toilet device comprising: A flush water tank device according to any one of claims 1 to 5; the flush toilet that is flushed with flush water supplied from this flush water tank device; A flush toilet device comprising:

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