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

Abstract

To provide a washing water tank device in which biasing of washing water flow to either of a flow channel at a flow channel branching portion of a water supply device is suppressed, and a flush toilet bowl device comprising the washing water tank device.SOLUTION: A washing water tank device comprises a water supply device 16 for supplying washing water from a water supply source, the water supply device comprising a flow channel branching portion 33 for making a flow channel branch toward a flush toilet bowl side flow channel 25 for directly supplying washing water to a flush toilet bowl and a tank side flow channel 23 for supplying water to a water storage tank. The flow channel branching portion 33 of the water supply device comprises: a pre-branch flow channel 33a connected to a water supply source side flow channel; 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 tank side flow channel. The center axis B4 of a first specific flow channel portion 33d extending in a specific direction in the first branch flow channel 33b is disposed at a position deviating from the center axis B2 of a downstream end portion extending in the specific direction in the pre-branch flow channel 33a.SELECTED DRAWING: Figure 8

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 a flush toilet, and a flush toilet device equipped with the same.

Background Art

[0002] Patent Document 1 discloses a flush toilet. This flush toilet is configured to discharge jet washing water that discharges water from a jet port provided at the bottom of the bowl portion and rim washing water that discharges water from a rim discharge hole provided at the upper end of the bowl portion, respectively. In this flush toilet, the washing water supplied from the 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 washing water uses the water stored in the low tank from the low tank side flow path. Also, the rim washing water uses the water supplied from the bowl side flow path.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a flush toilet as shown in Patent Document 1, it was not possible to supply water to the low tank side flow path and the bowl side flow path simultaneously from the water supply branch fitting. If an attempt is made to supply water to the low tank side flow path and the bowl side flow path simultaneously, since the required flow rate and water pressure in the low tank side flow path and the bowl side flow path after the water supply branch fitting are different, there is a concern that the washing water will flow unevenly into one of the flow paths, resulting in uneven flow of the washing water and causing flow turbulence.

[0005] Accordingly, the present invention has been made to solve the above-described problems and issues of the prior art, and an object thereof is to provide a washing water tank device capable of suppressing the flow of washing water from being biased to any one of the flow paths in the flow path branching portion of the water supply device, and a flushing toilet device including the same.

Means for Solving the Problems

[0006] To solve the above-described problems, an embodiment of the present invention is a washing water tank device that supplies washing water to a flushing toilet, and includes a water storage tank that stores the washing water to be supplied to the flushing toilet and has a drain port for discharging the stored washing water to the flushing toilet, and a water supply device that supplies washing water from a water supply source. The water supply device includes a flow path branching portion that branches the flow path toward a flushing toilet side flow path that directly supplies washing water to the flushing toilet and a tank side flow path that supplies water to the water storage tank. The flow path branching portion of the water supply device includes a pre-branching flow path connected to a water supply source side flow path extending from the water supply source, a first branched flow path connected to the flushing toilet side flow path, and a second branched flow path connected to the tank side flow path. The central axis of a first specific flow path portion extending in a specific direction in the first branched flow path of the flow path branching portion is arranged at a position shifted from the central axis of a downstream end portion extending in the specific direction in the pre-branching flow path. According to an embodiment of the present invention configured as described above, the flow rate per unit time of the washing water supplied through the first branch flow path that directly supplies the washing water to the flush toilet may be greater than the flow rate per unit time of the washing water supplied through the second branch flow path that supplies water to the water storage tank. Here, the central axis of the first specific flow path portion extending in a specific direction in the first branch flow path of the flow path branch portion is arranged at a position deviated from the central axis of the downstream end portion extending in the specific direction in the pre-branch flow path. Thereby, the flow of the washing water in a specific direction supplied from the pre-branch flow path can be made less likely to flow into the first specific flow path portion of the first branch flow path while maintaining the direction of the flow. Therefore, it is possible to suppress the occurrence of an event in which the branched washing water flows biased toward the first branch flow path side having a relatively large flow rate among the first branch flow path and the second branch flow path. Thus, it is possible to suppress the flow of the washing water from being biased to either one of the flow paths in the flow path branch portion of the water supply device, and the water supply performance from the water supply device provided with the flow path branch portion can be improved.

[0007] In one embodiment of the present invention, preferably, the central axis of the downstream end portion of the pre-branch flow path is closer to the central axis of the second specific flow path portion extending in the specific direction in the second branch flow path than the central axis of the first specific flow path portion of the first branch flow path. According to an embodiment of the present invention configured as described above, the central axis of the downstream end portion of the pre-branch flow path is closer to the central axis of the second specific flow path portion extending in the specific direction in the second branch flow path than the central axis of the first specific flow path portion of the first branch flow path. Therefore, the flow of the washing water in a specific direction from the pre-branch flow path can be made more likely to be supplied by the second specific flow path portion of the second branch flow path than the first specific flow path portion of the first branch flow path, and the washing water can be easily supplied to the second branch flow path. Therefore, it is possible to further suppress the occurrence of an event in which the branched washing water flows biased toward the first branch flow path side having a relatively large flow rate among the first branch flow path and the second branch flow path.

[0008] In one embodiment of the present invention, preferably, the angle formed between the central axis of the downstream end portion of the pre-branching flow path and the central axis of the inlet portion of the first branching flow path is larger than the angle formed between the central axis of the downstream end portion of the pre-branching flow path and the central axis of the inlet portion of the second branching flow path. According to one embodiment of the present invention configured as described above, the angle formed between the central axis of the downstream end portion of the pre-branching flow path and the central axis of the inlet portion of the first branching flow path is larger than the angle formed between the central axis of the downstream end portion of the pre-branching flow path and the central axis of the inlet portion of the second branching flow path. Thereby, it is possible to suppress the cleaning water supplied from the pre-branching flow path from flowing into the first branching flow path as compared with the second branching flow path. Therefore, it is possible to further suppress the occurrence of an event in which the branched cleaning water flows in a biased manner toward the first branching flow path among the first branching flow path and the second branching flow path.

[0009] In one embodiment of the present invention, preferably, when the central axis of the downstream end portion of the pre-branching flow path is extended, this central axis reaches within the flow path range of the inlet portion of the second branching flow path. According to one embodiment of the present invention configured as described above, when the central axis of the downstream end portion of the pre-branching flow path is extended, this central axis reaches within the flow path range of the inlet portion of the second branching flow path. Thereby, the pre-branching flow path is arranged toward the second branching flow path, and the cleaning water supplied from the pre-branching flow path is made to flow more easily toward the second branching flow path. Therefore, it is possible to cause the cleaning water that cannot completely flow into the second branching flow path with a relatively small flow rate to flow into the first branching flow path. Therefore, the cleaning water supplied from the pre-branching flow path is more likely to be supplied to the second branching flow path, and it is possible to further suppress the occurrence of an event in which the branched cleaning water flows in a biased manner toward the first branching flow path among the first branching flow path and the second branching flow path.

[0010] In one embodiment of the present invention, preferably, the length of the second branching flow path is shorter than the length of the first branching flow path. According to an embodiment of the present invention configured as described above, the length of the second branch flow path is shorter than the length of the first branch flow path. As a result, the pressure loss of the second branch flow path can be reduced compared to the pressure loss of the first branch flow path, and it becomes easier to supply cleaning water to the second branch flow path than to the first branch flow path. Therefore, it is possible to further suppress the occurrence of an event in which the branched cleaning water flows in a biased manner toward the first branch flow path side among the first branch flow path and the second branch flow path.

[0011] In one embodiment of the present invention, preferably, when the central axis of the downstream end portion of the pre-branch flow path is extended, the flow path branching portion is configured such that this central axis extends outside the flow path range of the inlet portion of the first branch flow path. According to an embodiment of the present invention configured as described above, when the central axis of the downstream end portion of the pre-branch flow path is extended, the flow path branching portion is configured such that this central axis extends outside the flow path range of the inlet portion of the first branch flow path. Therefore, it becomes difficult for the cleaning water supplied from the pre-branch flow path to flow linearly into the flow path range of the inlet portion of the first branch flow path, and it can be easily made to collide once with the flow path wall within the flow path branching portion and be retained within the flow path branching. Also, even if the first branch flow path is formed at a position closer to the pre-branch flow path than the second branch flow path, it can be made difficult for the cleaning water to be directly guided to the first branch flow path. Therefore, it can be made difficult for the cleaning water to be directly guided to the first branch flow path and easy to be supplied to the second branch flow path. Therefore, it is possible to further suppress the occurrence of an event in which the branched cleaning water flows in a biased manner toward the first branch flow path side among the first branch flow path and the second branch flow path.

[0012] In one embodiment of the present invention, preferably, the flow path branching portion includes a guide portion that guides the cleaning water toward the second branch flow path on the extension line of the central axis of the downstream end portion of the pre-branch flow path. According to an embodiment of the present invention configured as described above, the flow path branching portion includes a guide portion that guides the washing water toward the second branch flow path on an extension line of the central axis of the downstream end portion of the pre-branch flow path. Therefore, the washing water is easily guided toward the second branch flow path by the guide portion, and the washing water can be easily guided toward the second branch flow path. Further, even if the first branch flow path is formed at a position closer to the pre-branch flow path than the second branch flow path, the washing water can be easily guided toward the second branch flow path. Therefore, the washing water can be made less likely to be directly guided to the first branch flow path and can be easily supplied to the second branch flow path. Therefore, it is possible to further suppress the occurrence of an event in which the branched washing water flows in a biased manner toward the first branch flow path side among the first branch flow path and the second branch flow path.

[0013] Further, an embodiment of the present invention is a flush toilet device, which includes a washing water tank device capable of suppressing the flow of washing water from being biased to one of the flow paths in the flow path branching portion of the water supply device, and the flush toilet washed by the washing water supplied from this washing water tank device.

Effect of the Invention

[0014] According to the present invention, it is possible to provide a washing water tank device capable of suppressing the flow of washing water from being biased to one of the flow paths in the flow path branching portion of the water supply device, and a flush toilet device including the same.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0016] Next, with reference to the accompanying drawings, a cleaning water tank device according to an embodiment of the present invention and a flush toilet device including the same will be described. 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. are possible in its form and details without departing from the scope of the claims. FIG. 1 is a perspective view showing the entire flush toilet device according to an embodiment of the present invention. FIG. 2 is a full cross-sectional view of the flush toilet device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing the schematic configuration of the cleaning water tank device according to an embodiment of the present invention.

[0017] As shown in FIGS. 1 to 3, a flushing toilet device 1 according to an embodiment of the present invention includes a flushing toilet main body 2 and a cleaning water tank device 4 according to an embodiment of the present invention placed at the rear thereof. The cleaning water tank device 4 is configured to supply cleaning water to the flushing toilet main body 2. The flushing toilet device 1 of the present embodiment is configured such that, after use, the bowl portion 2a of the flushing toilet main body 2 is cleaned by operating a lever handle 8 provided on the cleaning water tank device 4. The cleaning water tank device 4 according to the present embodiment supplies the cleaning water stored therein and the cleaning water supplied from a water supply source, i.e., a water supply line C, to the flushing toilet main body 2 based on the operation of the lever handle 8, and is configured to clean the bowl portion 2a with these cleaning waters.

[0018] Further, as a modification, the present invention can also be configured such that the bowl portion 2a is cleaned by operating a remote control device (not shown) attached to a wall surface. Alternatively, the present invention can also be configured such that, after a human presence sensor (not shown) provided on the toilet seat detects the user getting up, the bowl portion 2a is cleaned after a predetermined time has elapsed. In this case, the human presence sensor (not shown) can be provided on the toilet seat or at a position where it can detect the user's sitting, getting up, approaching, leaving, or waving hand movements, and can be provided, for example, on the flushing toilet main body 2 or the cleaning water tank device 4. Also, the human presence sensor (not shown) only needs to be able to detect the user's sitting, getting up, approaching, leaving, or waving hand movements, and for example, an infrared sensor or a microwave sensor can be used as the human presence sensor.

[0019] Next, as shown in FIG. 2, the cleaning water tank device 4 includes a water storage tank 10 which is a cleaning water tank main 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 on the water storage tank 10, a drain valve hydraulic drive unit 14 which is a hydraulic drive mechanism for driving the drain valve 12, and a water supply device 16 for supplying the cleaning water from a water supply source. Here, the washing water stored in the water storage tank 10 and flowing out by opening the drain valve 12 is configured to be discharged from the jet outlet 2b, which is a lower water discharge port provided below the water storage surface W of the bowl portion 2a of the water closet body 2 during toilet flushing. Further, the washing water supplied from the water supply C and supplied via the water supply valve 19 on the toilet body side is configured to be discharged from the rim outlet 2d, which is an upper water discharge port provided at the rim portion 2c of the bowl portion 2a, above the water storage surface W of the bowl portion 2a during toilet flushing.

[0020] The water storage tank 10 is a tank configured to store the washing water to be supplied to the jet outlet 2b of the water closet body 2, and a drain port 10a for discharging the stored washing water to the water closet body 2 is formed at the bottom thereof. Further, in the water storage tank 10, an overflow pipe 10b is connected to the downstream side of the drain port 10a. This overflow pipe 10b rises vertically from the vicinity of the drain port 10a and extends above the water stop level L1 of the washing water stored in the water storage tank 10. Therefore, the washing water flowing in from the upper end of the overflow pipe 10b bypasses the drain port 10a and directly flows out from the jet outlet 2b of the water closet body 2.

[0021] The drain valve 12 is a direct-acting 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 water closet body 2 and discharged from the jet outlet 2b provided at the lower part of the bowl portion 2a.

[0022] 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. Specifically, the drain valve hydraulic drive unit 14 includes a cylinder 14a into which the water supplied from the tank-side water supply valve 18 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, 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.

[0023] The cylinder 14a is a cylindrical member, arranged with its axis in the vertical direction, and slidably receives the piston 14b inside. Also, an inflow pipe 23 is connected to the lower end of the cylinder 14a so that the water flowing out from the tank-side water supply valve 18 flows into the cylinder 14a. 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.

[0024] 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 from the outflow hole through the outflow pipe 24. That is, the inflow pipe 23 and the outflow pipe 24 are communicated through the inside of the cylinder 14a when the piston 14b is moved upward.

[0025] Further, a branch portion 24a is provided in the outflow pipe 24. The first downcomer 24b branched downward from this branch portion 24a opens downward above the overflow pipe 10b. Also, the second downcomer 24c that extends substantially horizontally from the branch portion 24a and then curves downward discharges water into the water storage tank 10. Therefore, a part of the cleaning water flowing out from the cylinder 14a flows into the overflow pipe 10b, and the remaining cleaning water is stored in the water storage tank 10.

[0026] The rod 15 is a rod-shaped member connected to the lower surface of the piston 14b, and extends downward from inside the cylinder 14a through a through hole 14f formed in the bottom surface of the cylinder 14a. Also, 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 opens.

[0027] Also, a gap 14d is provided between the rod 15 protruding from below the cylinder 14a and the inner wall of the through hole 14f of the cylinder 14a, and a part of the water flowing into the cylinder 14a flows out from this gap 14d. The water flowing out from the gap 14d flows into the water storage tank 10. Note that since this gap 14d is relatively narrow and the flow path resistance is large, even when water is flowing out from the gap 14d, the pressure inside the cylinder 14a increases due to the water flowing into the cylinder 14a from the inflow pipe 23, and the piston 14b is pushed upward against the biasing force of the spring 14c.

[0028] 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 the state where the clutch mechanism 22 is disengaged, the lower rod 15b no longer moves in conjunction with the movement of the upper part of the piston 14b and the upper rod 15a, and the lower rod 15b, together with the drain valve 12, descends by gravity while resisting buoyancy.

[0029] In the vicinity of the drain valve 12, a drain valve float mechanism 26 is provided. This drain valve float mechanism 26 is configured to delay the closing of the drain port 10a by allowing the rod 15 to be lifted by a predetermined distance and then separating the lower rod 15b by the clutch mechanism 22, after which the lower rod 15b and the drain valve 12 descend. Specifically, the drain valve float mechanism 26 includes a float portion 26a and an engagement portion 26b interlocked with the float portion 26a.

[0030] The engagement portion 26b is configured to engage with the lower rod 15b that has been separated by the clutch mechanism 22 and descended, and to prevent the lower rod 15b and the drain valve 12 from descending and seating on the drain port 10a. Then, as the water level in the water storage tank 10 drops, the float portion 26a descends. When the water level in the water storage tank 10 drops to a predetermined level, the float portion 26a rotates the engagement portion 26b, releasing the engagement between the engagement portion 26b and the lower rod 15b. The release of the engagement causes the lower rod 15b and the drain valve 12 to 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.

[0031] Also, a vacuum breaker 30 is provided in the inflow pipe 23 that connects the tank-side water supply valve 18 of the water supply device 16 and the drain valve hydraulic drive unit 14. When the tank-side water supply valve 18 side becomes negative pressure due to this vacuum breaker 30, outside air is sucked into the inflow pipe 23, preventing the backflow of water from the drain valve hydraulic drive unit 14 side.

[0032] Next, the water supply device 16 will be described with reference to FIGS. 4 to 8 and the like. FIG. 4 is a perspective view showing the internal structure of the washing water tank device according to an embodiment of the present invention with the lid of the washing water tank device removed, FIG. 5 is a side view showing the washing water tank device according to an embodiment of the present invention with the lid removed, FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 5, and FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 4.

[0033] As shown in FIG. 3, the water supply device 16 is provided between the water supply pipe 32 connected to the water supply C, the inflow pipe 23, and the rim water supply pipe 25. The water supply device 16 includes a flow path branching portion 33 that branches the flow path into a tank-side water supply valve 18 and a toilet body-side water supply valve 19, a tank-side water supply valve 18 connected to the second branch flow path 33c of the flow path branching portion 33, and a toilet body-side water supply valve 19 connected to the first branch flow path 33b of the flow path branching portion 33. The water supply device 16 is a type of water supply device including a flow path branching portion 33 that branches the flow path toward the rim water supply pipe 25 that constitutes the toilet-side flow path for directly supplying washing water to the flush toilet body 2 and the inflow pipe 23 that constitutes the tank-side flow path for supplying water to the 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 the washing water in the storage tank 10. The inflow pipe 23 forms a flow path that directly connects the water supply device 16 and the drain valve hydraulic drive portion 14 in the storage tank 10. The inflow pipe 23 constitutes the drain valve hydraulic drive portion-side flow path for supplying water to the drain valve hydraulic drive portion 14. The flow rate per unit time of the washing water supplied to the flush toilet body 2 through the rim water supply pipe 25 is made larger than the flow rate per unit time of the washing water supplied to the storage tank 10 through the inflow pipe 23.

[0034] The tank-side water supply valve 18 is a second on-off 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 also to control the water supply to and stop of the water storage tank 10. Next, the tank-side water supply valve 18 includes a control valve main body portion 18a, a main valve body 18b disposed in the control valve main body portion 18a, and a solenoid valve side pilot valve 18c. Further, a drain control solenoid valve 20 connected to the solenoid valve side pilot valve 18c is connected to the tank-side water supply valve 18.

[0035] The drain control solenoid valve 20 is configured to move the solenoid valve side pilot valve 18c built in the tank-side water supply valve 18 based on a signal sent from the controller 28, and to 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 portion 18a decreases, and the main valve body 18b of the tank-side water supply valve 18 is opened. Also, when the pilot valve port (not shown) is closed, the pressure in the pressure chamber increases, and the main valve body 18b is closed. Thereby, based on the operation of the drain control solenoid valve 20, the main valve body 18b of the tank-side water supply valve 18 is opened and closed, and the water supply to and stop of the drain valve hydraulic drive unit 14 are controlled. In this embodiment, as the drain control solenoid valve 20, a bistable latching solenoid that moves the solenoid valve side pilot valve 18c once energized and maintains its state even after the energization is stopped is used. In this type of solenoid valve, when energized again in the opposite direction, the solenoid valve side pilot valve 18c can be returned to its original position.

[0036] The washing 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 for detecting the water level. The float switch 34 is electrically connected to the controller 28. When the water level in the water storage tank 10 rises to the stop water level L1, the float switch 34 transmits to the controller 28 that the water level has reached the stop water level L1. Also, when the water level in the water storage tank 10 drops below the stop water level L1, the float switch 34 transmits to the controller 28 that the water level has dropped from the stop water level L1 to below the stop water level L1. When the controller 28 detects that the float switch 34 has detected that the water level has reached the stop water level L1, it 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 water supply to the water storage tank 10.

[0037] In the standby state of the washing water tank device 4, the water storage tank 10 is set to the stop water level L1. In this state, the pilot valve port (not shown) opened and closed by the solenoid valve side pilot valve 18c is closed. Therefore, during washing, based on the operation of the drain control solenoid valve 20, by moving the solenoid valve side pilot valve 18c, 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. Specifically, the controller 28 receives a signal from the lever handle 8, and the controller 28 sends an electrical signal to the drain control solenoid valve 20 to operate it and open the tank side water supply valve 18.

[0038] That is, the tank-side water supply valve 18 controls the supply and stop of the supplied washing water to the drain valve hydraulic drive unit 14 based on an instruction signal from the controller 28 which is a control unit. In the present embodiment, all of the washing water flowing out from the tank-side water supply valve 18 is supplied to the drain valve hydraulic drive unit 14 through the inflow pipe 23. A part of the washing 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 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.

[0039] The toilet body-side water supply valve 19 is a first on-off valve that directly supplies the washing water supplied from the water supply C to the toilet body 2. The toilet body-side water supply valve 19 is configured to let the water supplied from the first branch flow path 33b flow out to the rim water supply pipe 25. The rim water supply pipe 25 extends outside the water storage tank 10 and communicates with the rim water discharge port 2d of the toilet body 2 (not shown in FIG. 3), and the washing water flowing into the rim water supply pipe 25 is discharged from the rim water discharge port 2d as rim washing water for washing the bowl portion 2a. Also, a vacuum breaker 31 is provided in the middle of the rim water supply pipe 25. Thereby, when the toilet body-side water supply valve 19 side becomes negative pressure, it is possible to prevent water from flowing back from the toilet body 2 side to the toilet body-side water supply valve 19.

[0040] The toilet body side water supply valve 19 includes a water supply valve main body portion 19a, a main valve body 19b disposed therein, and a solenoid valve pilot valve 19c. Further, a water supply control solenoid valve 21 is connected to the toilet body side water supply valve 19, and the solenoid valve pilot valve 19c is configured to be moved by the water supply control solenoid valve 21. That is, the solenoid valve pilot valve 19c is configured to control the pressure in the pressure chamber provided in the water supply valve main body portion 19a by opening and closing a pilot valve port (not shown) provided in the water supply valve main body portion 19a. When the pilot valve port (not shown) is opened, the pressure in the pressure chamber provided in the water supply valve main body portion 19a decreases, and the main valve body 19b of the toilet body side 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. Thereby, based on the operation of the water supply control solenoid valve 21, the main valve body 19b of the toilet body side water supply valve 19 is opened and closed, and the water supply to and stop of the flushing toilet body 2 are controlled.

[0041] On the other hand, the cleaning water supplied from the water supply C is supplied to the tank side water supply valve 18 or the toilet body side water supply valve 19 via the stop valve 32a, the constant flow rate valve 32b, and the flow path branching portion. 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 flow path branching portion 33 is provided on the downstream side of the constant flow rate valve 32b.

[0042] The stop valve 32a is provided to stop the water supply to the cleaning water tank device 4 during maintenance or the like, and is normally used in an open state. The constant flow rate valve 32b is provided to allow the water supplied from the water supply C to flow into the water supply device 16 at a predetermined flow rate, and is configured to supply a constant flow rate of water to the water supply device 16 regardless of the installation environment of the flushing toilet device 1.

[0043] The flow path branching portion 33 is formed so as to branch the flow path toward the rim water supply pipe 25 that constitutes a washlet side flow path for directly supplying washing water to the washlet body 2 and the inflow pipe 23 that constitutes a tank side flow path for supplying water to the storage tank 10. The flow path branching portion 33 includes a pre-branching flow path 33a connected to a water supply source side flow path extending from a water supply source, a first branching flow path 33b connected to the rim water supply pipe 25 that constitutes the washlet side flow path, and a second branching flow path 33c connected to the inflow pipe 23 that constitutes the tank side flow path. The second branching flow path 33c is connected to the drain valve water pressure driving portion 14 via the inflow pipe 23, while the first branching flow path 33b is open to the atmosphere on the washlet body 2 side via the rim water supply pipe 25. Therefore, the pressure of the washing water in the second branching flow path 33c is relatively often higher than the pressure of the washing water in the first branching flow path 33b.

[0044] One end of the first branching flow path 33b is connected to the toilet body side water supply valve 19, and further connected to the rim water supply pipe 25 via the toilet body side water supply valve 19. The first branching flow path 33b is a pipe-shaped flow path formed in the water supply device 16. The first branching flow path 33b extends substantially horizontally in the lateral direction once from the downstream end of the pre-branching flow path 33a, and then bends upward and extends vertically. The central axis B1 of the first branching flow path 33b of the flow path branching portion 33 is arranged at a position shifted from the central axis B2 of the pre-branching flow path 33a. The angle formed by the central axis B1 of the first branching flow path 33b and the central axis B2 of the pre-branching flow path 33a is 90°. The central axis B2 of the branching portion of the pre-branching flow path 33a and the central axis B3 of the inlet portion of the second specific flow path portion 33e are arranged on the same line.

[0045] One end of the second branching flow path 33c is connected to the tank side water supply valve 18, and further connected to the inflow pipe 23 via the tank side water supply valve 18. The second branching flow path 33c is a pipe-shaped flow path formed in the water supply device 16. The second branching flow path 33c extends vertically upward from the downstream end of the pre-branching flow path 33a.

[0046] As shown in FIG. 8, when viewed along a specific direction D1, the central axis B2 of the downstream end portion of the pre-branch flow path 33a extending along the specific direction D1 is closer to the central axis B3 of the second specific flow path portion 33e extending in the specific direction D1 in the second branch flow path 33c than to the central axis B4 of 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 at the flow path branch portion 33 and is the direction in which the central axis B2 extends. In the present embodiment, the specific direction D1 is the vertical direction.

[0047] Further, when the central axis B2 of the downstream end portion of the pre-branch flow path 33a is extended, the extended central axis B2 reaches within the flow path range E1 of the inlet portion of the second branch flow path 33c. More specifically, the extended central axis B2 is arranged so as to pass inside the inner diameter of the water passage of the inlet portion (branch portion) of the second branch flow path 33c.

[0048] The angle α1 (90° in the present embodiment) formed between the central axis B2 of the downstream end portion of the pre-branch flow path 33a and the central axis B1 of the inlet portion of the first branch flow path 33b is larger than the angle α2 (not shown in the figure because it is 0° in the present embodiment) formed between the central axis B2 of the downstream end portion of the pre-branch flow path 33a and the central axis B3 of the inlet portion of the second branch flow path 33c. Thereby, the bending angle α2 of the flow path from the pre-branch flow path 33a into the second branch flow path 33c is formed smaller than the bending angle α1 of the flow path from the pre-branch flow path 33a into the first branch flow path 33b, and the flow of the washing water supplied from the pre-branch flow path 33a is made easier to flow into the second branch flow path 33c than into the first branch flow path 33b. The angle α2 is set to a value within the range of 0° ≦ α2 ≦ 90°.

[0049] The length of the second branch flow path 33c, for example, the length G1 from the inlet portion of the second branch flow path 33c to the tank-side water supply valve 18, is shorter than the length of the first branch flow path 33b, for example, the length G2 from the inlet portion of the first branch flow path 33b to the toilet body-side water supply valve 19.

[0050] Note that FIG. 9 shows a modified example of the flow path branching portion 33. In the flow path branching portion 33 of the modified example, the positions and shapes of the first branch flow path 33b and the second branch flow path 33c with respect to the pre-branch flow path 33a are changed. The flow path branching portion 33 of the modified example includes a pre-branch flow path 33a, a first branch flow path 33b that extends upward at a position deviated from the extension line of the pre-branch flow path 33a above the pre-branch flow path 33a, and a second branch flow path 33c that extends substantially horizontally in the lateral direction from the downstream end of the pre-branch flow path 33a. When the central axis B2 extending along the specific direction D1 of the downstream end portion of the pre-branch flow path 33a is extended, the flow path branching portion 33 is configured such that the central axis B2 extends outside the flow path range E1 of the inlet portion of the first branch flow path 33b. The first branch flow path 33b is formed to extend in the specific direction D1 at a position deviated from the central axis B1 of the pre-branch flow path 33a. Therefore, it becomes difficult for the cleaning water supplied from the pre-branch flow path 33a to flow linearly into the flow path range E1 of the inlet portion of the first branch flow path 33b, and it can easily collide with the flow path wall in the flow path branching portion 33, for example, the guide portion 36 described later, and be retained in the flow path branching portion 33.

[0051] Further, the flow path branching portion 33 includes a guide portion 36 that guides the cleaning water toward the second branch flow path 33c on the extension line of the central axis B2 extending along the specific direction D1 of the downstream end portion of the pre-branch flow path 33a. The guide portion 36 is formed on the extension line of the central axis B2 and forms a wall surface orthogonal to the central axis B2. Therefore, as shown by the arrow F1, the main flow of the cleaning water flowing in from the pre-branch flow path 33a collides with the opposing guide portion 36 and is guided toward the lateral second branch flow path 33c. Therefore, it is possible to make it difficult for the cleaning water to be directly guided to the first branch flow path 33b and easy for it to be supplied to the second branch flow path 33c.

[0052] Furthermore, FIG. 10 shows still another modification of the flow path branching portion 33. In the flow path branching portion 33 of still another modification, the first branch flow path 33b and the second branch flow path 33c are formed at positions where they branch into two from the pre-branch flow path 33a. The flow path branching portion 33 of a further modification includes a pre-branch flow path 33a, a first branch flow path 33b that extends upward at a position shifted to one side from the extension line of the pre-branch flow path 33a above the pre-branch flow path 33a, and a second branch flow path 33c that extends upward at a position shifted to the other side from the extension line of the pre-branch flow path 33a.

[0053] When the central axis B2 extending along the specific direction D1 at the downstream end portion of the pre-branch flow path 33a is extended, the flow path branching portion 33 is configured such that the central axis B2 extends outside the flow path range H1 of the inlet portion of the first branch flow path 33b. The first branch flow path 33b is formed to extend in the specific direction D1 at a position shifted from the central axis B2 of the pre-branch flow path 33a. Therefore, the cleaning water supplied from the pre-branch flow path 33a can be made less likely to collide directly with the flow path wall within the flow path branching portion 33 and flow linearly into the flow path range H1 of the inlet portion of the first branch flow path 33b. Also, the flow path branching portion 33 includes a guide portion 36 that guides the incoming cleaning water toward the second branch flow path 33c while preventing it from flowing directly into the first branch flow path 33b, on the extension line of the central axis B2 extending along the specific direction D1 at the downstream end portion of the pre-branch flow path 33a. The guide portion 36 is formed on the extension line of the central axis B2 and forms a wall surface orthogonal to the central axis B2. Therefore, as shown by the arrow F2, the main flow of the cleaning water flowing in from the pre-branch flow path 33a collides with the opposing guide portion 36 and is guided toward the lateral second branch flow path 33c. Therefore, the cleaning water can be made less likely to be directly guided to the first branch flow path 33b while being easily supplied to the second branch flow path 33c.

[0054] Returning to the present embodiment for explanation, the controller 28 incorporates a CPU, a memory, an interface circuit, etc., and can control other electrically connected devices based on a predetermined control program or the like. 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., can transmit and receive electrical signals to and from each other, and can electrically operate each part.

[0055] 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 of the control valve main body 18a decreases and the main valve body 18b moves, opening the tank side water supply valve 18. As a result, the washing water supplied from the water supply pipe 32 flows out from the tank side water supply valve 18 to the drain valve hydraulic drive unit 14 and is supplied to the water storage tank 10 through the drain valve hydraulic drive unit 14.

[0056] Also, 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 of the water supply valve main body 19a decreases and the main valve body 19b moves, opening the toilet body side water supply valve 19. As a result, the washing 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 discharge port 2d of the flush toilet body 2.

[0057] Next, with reference to FIG. 3, FIG. 8, etc., the operation of the washing water tank device 4 according to an embodiment of the present invention and the flush toilet device 1 equipped with the same will be described.

[0058] First, in the standby state of toilet flushing as shown in FIG. 3, the water level in the water storage tank 10 is at the water stop level L1, and the drain control solenoid valve 20 and the water supply control solenoid valve 21 are not energized. In this state, the pilot valve port (not shown) opened and closed by the solenoid valve side pilot valve 18c is closed. As a result, the main valve body 18b of the tank side water supply valve 18 is in the closed state. Also, the pilot valve port (not shown) opened and closed by the solenoid valve pilot valve 19c is closed, and the main valve body 19b of the toilet body side water supply valve 19 is also in the closed state.

[0059] Next, when the user operates the lever handle 8 (FIG. 1), a signal instructing toilet flushing is sent to the controller 28 (FIG. 3). Upon receiving the toilet flushing instruction signal, the controller 28 energizes the water supply control solenoid valve 21 and opens the solenoid valve pilot valve 19c of the toilet body side water supply valve 19. As a result, the pressure in the pressure chamber of the toilet body side water supply valve 19 decreases, and the main valve body 19b separates from the valve seat and opens. In this embodiment, since a bistable latching type solenoid is used as the water supply control solenoid valve 21, once the solenoid valve pilot valve 19c is opened, the open state is maintained even if the energization is stopped.

[0060] When the toilet body side water supply valve 19 is opened, the tap water supplied to the toilet body side water supply valve 19 from the water supply pipe 32 through the flow path branch portion 33 and the first branch flow path 33b flows into the rim water supply pipe 25 through the toilet body side water supply 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 wash toilet body 2, and the washing of the bowl portion 2a is started by the rim washing water.

[0061] After energizing the electromagnetic valve 21 for water supply control, after a predetermined time has elapsed, the controller 28 energizes the electromagnetic valve 20 for drainage control to disengage the pilot valve 18c on the electromagnetic valve side from the pilot valve port (not shown). As a result, the pressure in the pressure chamber of the water supply valve 18 on the tank side decreases, and the main valve body 18b disengages from the valve seat and opens. That is, after the controller 28 opens the water supply valve 19 on the toilet body side, the controller 28 opens the water supply valve 18 on the tank side while maintaining the open state of the water supply valve 19 on the toilet body side. In this embodiment, since a bistable latching solenoid is used as the electromagnetic valve 20 for drainage control, once the pilot valve 18c on the electromagnetic valve side is opened, the open state is maintained even if the energization is stopped. When the water supply valve 18 on the tank side opens, the tap water supplied to the water supply valve 18 on the tank side from the water supply pipe 32 via the flow path branch portion 33 and the second branch flow path 33c flows into the inflow pipe 23 through the water supply valve 18 on the tank side.

[0062] Furthermore, the cleaning water that has flowed into the inflow pipe 23 flows into the cylinder 14a of the drain valve hydraulic drive unit 14 and pushes up the piston 14b. 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 opens. Thereby, the cleaning water stored in the water storage tank 10 flows out through the drain port 10a and is discharged from the jet outlet 2b (FIG. 2) provided at the lower part of the bowl portion 2a. The cleaning water discharged from the jet outlet 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. Thus, when the drain port 10a opens, the cleaning water is discharged temporarily from both the rim outlet 2d and the jet outlet 2b.

[0063] As shown in FIG. 8, the state when washing water is simultaneously supplied 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 will be described. At this time, the flow rate per unit time of the washing water directly supplied for washing the toilet body 2 by the water supply device 16 through the rim water supply pipe 25 is larger than the flow rate per unit time of the washing water supplied to the water storage tank 10 through the inflow pipe 23, and the flow rate per unit time of the washing water supplied through the first branch flow path 33b is larger than the flow rate per unit time of the washing water supplied through the second branch flow path 33c.

[0064] In the flow path branching portion 33, since the direction of the flow of the washing water supplied from the pre-branch flow path 33a (specific direction D1) and the direction of the flow flowing into the first branch flow path 33b (direction D2) are deviated, it is difficult for the washing water supplied from the pre-branch flow path 33a to linearly flow into the first branch flow path 33b while maintaining the direction of the flow (specific direction D1). It is possible to suppress the occurrence of an event in which the branched washing water flows in a biased manner toward the first branch flow path 33b side among the first branch flow path 33b and the second branch flow path 33c. For example, a flow rate bias in which a flow rate larger than the specified flow rate planned to flow through the first branch flow path 33b side flows to the first branch flow path 33b side and a flow rate smaller than the specified flow rate planned to flow through the second branch flow path 33c side flows to the second branch flow path 33c side can be suppressed.

[0065] Also, the central axis B2 of the downstream end portion extending along the specific direction D1 in the pre-branch flow path 33a is closer to the central axis B3 of the second specific flow path portion 33e extending along the specific direction D1 in the second branch flow path 33c than the central axis B4 of the first specific flow path portion 33d extending along the specific direction D1 in the first branch flow path 33b. Therefore, the cleaning water supplied from the pre-branch flow path 33a can be more easily supplied to the second specific flow path portion 33e extending along the specific direction D1 in the second branch flow path 33c than to the first specific flow path portion 33d extending along the specific direction D1 in the first branch flow path 33b, and the cleaning water can be easily supplied to the second branch flow path 33c. For example, when the pre-branch flow path 33a extending in the specific direction D1, the first specific flow path portion 33d, and the second specific flow path portion 33e are formed in the water supply device 16, the flow of the pre-branch flow path 33a can be made to easily flow into the second specific flow path portion 33e extending in the same direction at a closer position, and the cleaning water can be easily supplied to the second branch flow path 33c.

[0066] Also, the angle α1 formed between the central axis B2 of the pre-branch flow path 33a and the central axis B1 of the inlet portion of the first branch flow path 33b is larger than the angle α2 (not shown) formed between the central axis B2 of the pre-branch flow path 33a and the central axis B3 of the inlet portion of the second branch flow path 33c. Therefore, the flow of the cleaning water supplied from the pre-branch flow path 33a is made to more easily flow into the second branch flow path 33c than into the first branch flow path 33b. The event that the branched cleaning water is biased and flows into the first branch flow path 33b side of the first branch flow path 33b and the second branch flow path 33c can be made less likely to occur.

[0067] Also, when the central axis line B2 of the downstream end portion of the pre-branch flow path 33a is extended, the extended central axis line B2 reaches within the flow path range E1 of the inlet portion of the second branch flow path 33c. Thereby, the pre-branch flow path 33a is arranged toward the second branch flow path 33c, and the cleaning water supplied from the pre-branch flow path 33a is first directed toward the second branch flow path 33c, and the cleaning water that cannot completely flow into the second branch flow path 33c (for example, the cleaning water that cannot completely flow in and stays at the inlet) can be made to flow into the first branch flow path 33b side. Thereby, the cleaning water supplied from the pre-branch flow path 33a can be made to more easily flow into the second branch flow path 33c, and the event that the branched cleaning water is biased and flows into the first branch flow path 33b side can be made less likely to occur.

[0068] Also, the length G1 of the second branch flow path 33c is made shorter than the length G2 of the first branch flow path 33b. Thereby, the pressure loss of the second branch flow path 33c can be reduced compared to the pressure loss of the first branch flow path 33b, and the cleaning water can be more easily supplied to the second branch flow path 33c than to the first branch flow path 33b. The branched cleaning water can be made more likely to flow into the second branch flow path 33c side out of the first branch flow path 33b and the second branch flow path 33c, and the event that the branched cleaning water is biased and flows into the first branch flow path 33b side can be made even less likely to occur.

[0069] In this way, the cleaning water supplied from the pre-branch flow path 33a can be branched into a flow of a predetermined flow rate flowing into the first branch flow path 33b and a flow of a predetermined flow rate flowing into the second branch flow path 33c even when the cleaning water is supplied to the two flow paths at the same timing in the flow path branching portion 33.

[0070] Next, again, the continuation of the operations of the cleaning water tank device 4 and the like from the operation in which the cleaning water flowing into the inflow pipe 23 flows into the drain valve water pressure driving unit 14 will be described. In the drain valve hydraulic drive unit 14, when the piston 14b is pushed upward and accordingly the rod 15 and the drain valve 12 are pulled up to a predetermined position, the clutch mechanism 22 disconnects the lower rod 15b and the drain valve 12 from the upper rod 15a. As a result, while the upper rod 15a remains pushed upward together with the piston 14b during the opening of the tank-side water supply 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.

[0071] Also, 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. Also, a part of the water flowing 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. 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 bowl 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.

[0072] Next, when the water level in the water storage tank 10 drops due to the discharge of the cleaning water in the water storage tank 10, the float switch 34 is in a state where it does not detect the water level. Thereby, the controller 28 controls the drain control solenoid valve 20 so that the solenoid valve side pilot valve 18c remains disengaged from the pilot valve port. The tank side water supply valve 18 is maintained in the open state.

[0073] Next, when the cleaning water in the water storage tank 10 is discharged from the drain port 10a and the water level in the water storage tank 10 drops to a predetermined water level, the float portion 26a of the drain valve float mechanism 26 descends, which moves the engaging portion 26b. As a result, the engagement between the lower rod 15b and the engaging portion 26b is released, and the lower rod 15b and the drain valve 12 start to descend again. Then, after a predetermined time has elapsed, the drain port 10a of the water storage tank 10 is closed by the drain valve 12, and the discharge of the cleaning water flowing out from the drain port 10a from the jet discharge port 2b stops.

[0074] Furthermore, even after the drain port 10a is closed, since the tank side water supply valve 18 is in the open state, the water supplied from the water supply pipe 32 flows into the drain valve hydraulic drive unit 14 and flows out to the outflow pipe 24. A part of the cleaning water flowing out from the outflow pipe 24 flows into the overflow pipe 10b through the first down pipe 24b. Therefore, even after the drain port 10a is closed, the cleaning water flowing into the overflow pipe 10b flows into the bowl portion 2a through the jet discharge port 2b in a small flow rate, and the flowing-in cleaning water is used as refill water. Also, the remaining part of the cleaning water flowing out from the outflow pipe 24 flows into the water storage tank 10 through the second down pipe 24c, so the water level in the water storage tank 10 rises.

[0075] Furthermore, after a predetermined time has elapsed since the start of cleaning, the controller 28 sends a control signal to the electromagnetic valve for water supply control 21 to close the solenoid pilot valve 19c of the water supply valve 19 on the toilet body side. As a result, the water discharge from the rim water discharge port 2d of the water wash toilet body 2 stops. Note that after the jet water discharge ends, the cleaning water discharged from the rim water discharge port 2d also flows into the bowl portion 2a and is used as refill water. Even after the water supply valve 19 on the toilet body side is closed, the water supply valve 18 on the tank side remains open, and the cleaning water that has flowed 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.

[0076] Next, when the water level in the water storage tank 10 rises to a predetermined water stop level L1, the float switch 34 detects the water level, and the controller 28 controls the drain control electromagnetic valve 20 to move the solenoid valve side pilot valve 18c and close the pilot valve port. As a result, the pressure in the pressure chamber of the control valve main body portion 18a rises to close the main valve body 18b, and the water supply valve 18 on the tank side is closed. Thus, the water supply to the water storage tank 10 stops. As a modification, the open state of the water supply valve 19 on the toilet body side may be maintained until after the water supply valve 18 on the tank side is closed, and the water supply valve 19 on the toilet body side may be closed after the water supply valve 18 on the tank side is closed to configure the present invention. Also, as another modification, without arranging the float switch 34, the controller 28 may be configured to control the drain control electromagnetic 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 by receiving the operation signal of the lever handle 8. Further, as still another modification, instead of the float switch 34, a mechanical float device may be arranged, and the pilot valve port may be closed or opened by moving the float side pilot valve according to the detection of the water level of the mechanical float device.

[0077] On the one hand, when the supply of water to the drain valve hydraulic drive unit 14 is stopped by closing the tank-side water supply valve 18, 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 the lower rod 15b that were separated by the clutch mechanism 22 are connected again. Therefore, the next time the toilet bowl is washed, the upper rod 15a and the lower rod 15b are both pulled up by the piston 14b. As described above, one toilet bowl washing is completed, and the flushing toilet device returns to the standby state for toilet bowl washing.

[0078] According to the washing water tank device 4 according to the above-described embodiment of the present invention, the flow rate per unit time of the washing water supplied through the first branch flow path 33b that directly supplies the washing water to the flushing toilet main body 2 may be larger than the flow rate per unit time of the washing water supplied through the second branch flow path 33c that supplies water to the water storage tank 10. Here, the central axis B4 of the first specific flow path portion 33d extending in a specific direction in the first branch flow path 33b of the flow path branch portion 33 is arranged at a position deviated from the central axis B2 of the downstream end portion extending in the specific direction in the pre-branch flow path 33a. Thereby, the flow of the washing water in the specific direction supplied from the pre-branch flow path 33a can be made difficult to flow into the first specific flow path portion 33d of the first branch flow path 33b while maintaining the direction of the flow. Therefore, it is possible to suppress the occurrence of an event in which the branched washing water is biased and flows into the first branch flow path 33b having a relatively large flow rate among the first branch flow path 33b and the second branch flow path 33c. Therefore, it is possible to suppress the flow of the washing water from being biased to either one of the flow paths in the flow path branch portion 33 of the water supply device 16, and the water supply performance from the water supply device 16 including the flow path branch portion 33 can be improved.

[0079] Furthermore, according to the washing water tank device 4 according to an embodiment of the present invention, the central axis B2 of the downstream end portion of the pre-branching flow path 33a is closer to the central axis of the second specific flow path portion 33e extending in a specific direction in the second branching flow path 33c than the central axis B4 of the first specific flow path portion 33d of the first branching flow path 33b. Therefore, the flow of the washing water in the specific direction from the pre-branching flow path 33a can be more easily supplied by the second specific flow path portion 33e of the second branching flow path 33c than by the first specific flow path portion 33d of the first branching flow path 33b, and the washing water can be more easily supplied to the second branching flow path 33c. Accordingly, it is possible to further suppress the occurrence of an event in which the branched washing water flows in a biased manner toward the first branching flow path 33b having a relatively large flow rate among the first branching flow path 33b and the second branching flow path 33c.

[0080] Furthermore, according to the washing water tank device 4 according to an embodiment of the present invention, the angle α1 formed between the central axis B2 of the downstream end portion of the pre-branching flow path 33a and the central axis B1 of the inlet portion of the first branching flow path 33b is larger than the angle α2 formed between the central axis B2 of the downstream end portion of the pre-branching flow path 33a and the central axis B3 of the inlet portion of the second branching flow path 33c. Thereby, it is possible to suppress the washing water supplied from the pre-branching flow path 33a from flowing into the first branching flow path 33b as compared with the second branching flow path 33c. Accordingly, it is possible to further suppress the occurrence of an event in which the branched washing water flows in a biased manner toward the first branching flow path 33b among the first branching flow path 33b and the second branching flow path 33c.

[0081] Furthermore, according to the cleaning water tank device 4 according to an embodiment of the present invention, when the central axis B2 of the downstream end portion of the pre-branch flow path 33a is extended, this central axis B2 reaches within the flow path range E1 of the inlet portion of the second branch flow path 33c. Thereby, the pre-branch flow path 33a is arranged toward the second branch flow path 33c, and the cleaning water supplied from the pre-branch flow path 33a is made to flow easily toward the second branch flow path 33c. Therefore, the cleaning water that cannot completely flow into the second branch flow path 33c with a relatively small flow rate can be made to flow into the first branch flow path 33b. Therefore, the cleaning water supplied from the pre-branch flow path 33a is more likely to be supplied to the second branch flow path 33c, and an event in which the branched cleaning water is biased and flows into the first branch flow path 33b side of the first branch flow path 33b and the second branch flow path 33c can be more suppressed.

[0082] Furthermore, according to the cleaning water tank device 4 according to an embodiment of the present invention, the length G1 of the second branch flow path 33c is shorter than the length G2 of the first branch flow path 33b. Thereby, the pressure loss of the second branch flow path 33c can be reduced compared to the pressure loss of the first branch flow path 33b, and the cleaning water can be more easily supplied to the second branch flow path 33c than to the first branch flow path 33b. Therefore, an event in which the branched cleaning water is biased and flows into the first branch flow path 33b side of the first branch flow path 33b and the second branch flow path 33c can be further suppressed.

[0083] Furthermore, according to the washing water tank device 4 according to an embodiment of the present invention, when the central axis B2 of the downstream end portion of the pre-branch flow path 33a is extended, the flow path branching portion 33 is configured such that this central axis B2 extends outside the flow path range H1 of the inlet portion of the first branch flow path 33b. Therefore, the washing water supplied from the pre-branch flow path 33a is less likely to flow linearly into the flow path range H1 of the inlet portion of the first branch flow path 33b, and can easily collide with the flow path wall in the flow path branching portion 33 and be retained in the flow path branch. Also, even if the first branch flow path 33b is formed at a position closer to the pre-branch flow path 33a than the second branch flow path 33c, it is possible to make it difficult for the washing water to be directly guided to the first branch flow path 33b. Therefore, it is possible to make it difficult for the washing water to be directly guided to the first branch flow path 33b and easy for it to be supplied to the second branch flow path 33c. Therefore, it is possible to further suppress the occurrence of the event that the branched washing water flows in a biased manner toward the first branch flow path 33b side among the first branch flow path 33b and the second branch flow path 33c.

[0084] Furthermore, according to the washing water tank device 4 according to an embodiment of the present invention, the flow path branching portion 33 includes a guide portion 36 that guides the washing water toward the second branch flow path 33c on the extension line of the central axis B2 of the downstream end portion of the pre-branch flow path 33a. Therefore, it becomes easier for the washing water to be guided toward the second branch flow path 33c by the guide portion 36, and it is possible to easily guide the washing water toward the second branch flow path 33c. Also, even if the first branch flow path 33b is formed at a position closer to the pre-branch flow path 33a than the second branch flow path 33c, it is possible to easily guide the washing water toward the second branch flow path 33c. Therefore, it is possible to make it difficult for the washing water to be directly guided to the first branch flow path 33b and easy for it to be supplied to the second branch flow path 33c. Therefore, it is possible to further suppress the occurrence of the event that the branched washing water flows in a biased manner toward the first branch flow path 33b side among the first branch flow path 33b and the second branch flow path 33c.

[0085] Furthermore, one embodiment of the present invention is a flushing toilet device 1, comprising a flushing toilet main body 2 and a washing water tank device 4 capable of suppressing the flow of washing water from being biased to either one of the flow paths in the flow path branching portion 33 of the water supply device 16.

Explanation of reference numerals

[0086] 1: Water-washing toilet device 2: Water-washing toilet body 4: Cleaning water tank device 10: Water storage tank 10a: Drain outlet 16: Water supply device 33: Flow path branching part 33a: Flow path before branching 33b: First branched flow path 33c: Second branched flow path 33d: First specific flow path part 33e: Second specific flow path part 36: Guide part

Claims

1. A cleaning water tank device for supplying cleaning water to a flush toilet, comprising: a water storage tank for storing the cleaning water to be supplied to the flush toilet and having a drain port for discharging the stored cleaning water to the flush toilet; a water supply device for supplying cleaning water from a water supply source, the water supply device comprising a flow path branching portion for branching the flow path toward a flush toilet side flow path for directly supplying cleaning water to the flush toilet and a tank side flow path for supplying water to the water storage tank; the flow path branching portion of the water supply device comprises a pre-branching flow path connected to a water supply source side flow path extending from the water supply source, a first branching flow path connected to the flush toilet side flow path, and a second branching flow path connected to the tank side flow path and having a smaller flow rate than the first branching flow path; the first branching flow path of the flow path branching portion comprises a first specific flow path portion extending in a direction substantially the same as a specific direction which is the direction of the flow path at the downstream end portion of the pre-branching flow path, and the central axis of this first specific flow path portion is disposed at a position offset from the central axis of the downstream end portion of the pre-branching flow path; the second branching flow path comprises a second specific flow path portion extending in a direction substantially the same as the specific direction, and the central axis of the downstream end portion of the pre-branching flow path is closer to the central axis of the second specific flow path portion of the second branching flow path than to the central axis of the first specific flow path portion of the first branching flow path, a cleaning water tank device.

2. The angle formed between the central axis of the downstream end portion of the pre-branching flow path and the central axis of the inlet portion of the first branching flow path is larger than the angle formed between the central axis of the downstream end portion of the pre-branching flow path and the central axis of the inlet portion of the second branching flow path, the cleaning water tank device according to Claim 1.

3. When the central axis of the downstream end portion of the pre-branching flow path is extended, this central axis reaches within the flow path range of the inlet portion of the second branching flow path, the cleaning water tank device according to Claim 1 or 2.

4. The length of the second branching flow path is shorter than the length of the first branching flow path, the cleaning water tank device according to any one of Claims 1 to 3.

5. The flow path branching portion is configured such that when the central axis of the downstream end portion of the pre-branching flow path is extended, this central axis extends outside the flow path range of the inlet portion of the first branching flow path, the cleaning water tank device according to Claim 1.

6. The cleaning water tank device according to claim 5, wherein the flow path branching portion includes a guide portion that guides cleaning water toward the second branched flow path on an extension line of the central axis of the downstream end portion of the flow path before branching.

7. A flush toilet device, the cleaning water tank device according to any one of claims 1 to 6, and the flush toilet that is cleaned by the cleaning water supplied from the cleaning water tank device. The flush toilet device is characterized by comprising the above.

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