Flush water tank device

Abstract

To provide a flush water tank device with a hand wash basin that enables water discharge from a hand wash water discharge part regardless of an amount of flush water in a flush water tank.SOLUTION: A flush water tank device 1 comprises: a flush water tank 30 which stores flush water and has a drain port 30a for discharging the stored flush water to a toilet 10 formed therein; a hand wash water discharge part 42 which discharges a part of the flush water supplied to the flush water tank 30 as hand wash water; a hand wash basin 41 which receives the flush water discharged from the hand wash water discharge part 42 and supplies the received flush water to the flush water tank 30; and a solenoid valve 26 and a hand wash water supply control valve 25 which perform discharge and stoppage of discharge from the hand wash water discharge part 42.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a flush water tank apparatus. [Background technology]

[0002] Conventionally, toilet units equipped with a flush water tank device with a hand washing basin are known (see, for example, Patent Document 1). In such a flush water tank device with a hand washing basin, as the flushing of the toilet bowl progresses and the flush water level in the flush water tank drops, a float in a ball tap provided in the water supply channel descends, opening the water supply channel. When the water supply channel is opened, tap water is supplied to the flush water tank as flush water, and is also supplied to the hand washing water outlet as flush water for hand washing. The flush water supplied to the hand washing water outlet is discharged toward the hand washing basin, and then supplied to the flush water tank where it is stored. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-190176 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional flush water tank devices with hand washing basins, the supply of flush water to the hand washing water outlet depends on the amount of flush water in the flush water tank, and therefore flush water cannot be discharged from the hand washing water outlet except when the amount of flush water in the flush water tank has decreased due to flushing of the toilet bowl.

[0005] In addition, the water supply channel remains closed after the flush water tank drain valve opens and flushing of the toilet bowl begins until the flush water level in the flush water tank drops to a predetermined level, which causes a delay in the supply of flush water to the hand-washing water outlet and a delay in the timing of the flush water being discharged from the hand-washing water outlet.

[0006] Furthermore, because flush water discharged from the hand-washing water outlet is stored in the flush water tank, flush water that has passed through the hand-washing basin continues to be supplied to the flush water tank even after the flush water level in the flush water tank reaches a predetermined level and the supply of flush water from the tap is stopped. As a result, the flush water level stored in the flush water tank exceeds the predetermined level, delaying the supply of flush water to the hand-washing water outlet, and further delaying the timing of flush water discharge from the hand-washing water outlet. In addition, because the amount of flush water in the flush water tank fluctuates and varies depending on whether or not a hand-washing basin is installed, it was necessary to set the nominal water volume with a margin of error.

[0007] Therefore, it is desirable to develop a flush water tank device with a hand washing basin that can discharge water from the hand washing water discharge section regardless of the amount of flush water in the flush water tank.

[0008] The present disclosure aims to provide a flush water tank device with a hand washing basin that can discharge water from a hand washing water discharge section regardless of the amount of flush water in the flush water tank. [Means for solving the problem]

[0009] The present disclosure relates to a flush water tank device comprising: a flush water tank for storing flush water and having a drain outlet formed for discharging the stored flush water into a flush toilet; a hand-washing water outlet section that discharges a portion of the flush water supplied to the flush water tank as flush water for hand washing; a hand-washing basin that receives the flush water discharged from the hand-washing water outlet section and supplies it to the flush water tank; and a first solenoid valve that starts and stops the discharge of water from the hand-washing water outlet section. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a toilet unit equipped with a flush water tank apparatus according to a first embodiment. FIG. [Figure 2] 1 is a schematic diagram of a flush water tank apparatus according to a first embodiment. [Figure 3] FIG. 10 is a schematic diagram of a flush water tank apparatus according to a second embodiment. [Figure 4]FIG. 10 is a schematic diagram of a flush water tank apparatus according to a third embodiment. [Figure 5] FIG. 10 is a schematic diagram of a flush water tank apparatus according to a fourth embodiment. [Figure 6] FIG. 10 is a schematic diagram of a flush water tank apparatus according to a fifth embodiment. [Figure 7] FIG. 10 is a schematic diagram of a flush water tank apparatus according to a sixth embodiment. [Figure 8] FIG. 13 is a schematic diagram of a flush water tank apparatus according to a seventh embodiment. [Figure 9] FIG. 13 is a diagram showing the flush valve of the flush water tank apparatus according to the seventh embodiment when water is stopped. [Figure 10] FIG. 13 is a diagram showing the flush valve of a flush water tank apparatus according to a seventh embodiment when activated. [Figure 11] FIG. 13 is a diagram showing the flush valve of a flush water tank apparatus according to a seventh embodiment when opening. [Figure 12] FIG. 13 is a diagram showing the flush valve of a flush water tank apparatus according to a seventh embodiment when it is operating to close. [Figure 13] FIG. 13 is a diagram showing the flush valve of a flush water tank apparatus according to a seventh embodiment when it is operating to close. [Figure 14] FIG. 13 is a schematic diagram of a flush water tank apparatus according to a first modified example of the seventh embodiment. [Figure 15] FIG. 13 is a schematic diagram of a flush water tank apparatus according to a second modification of the seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the description of the second and subsequent embodiments, components common to the first and second embodiments will be denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

[0012] [First embodiment] As shown in Figure 1, a toilet unit 100 equipped with a flush water tank apparatus 1 according to the first embodiment comprises a toilet bowl 10 and a flush water tank apparatus 1. Note that the cover tank 50 is not shown except in Figures 3 and 4.

[0013] The toilet 10 comprises a toilet body 11, a toilet seat 12 and a toilet lid 13 that are openably and closably attached to the top of the toilet body 11. A toilet bowl 11a with an open top is formed inside the toilet body 11, and flush water is supplied to this toilet bowl 11a from a flush water tank device 1, which will be described later.

[0014] The flush water tank device 1 comprises a base plate 3, a flush water tank 30, a hand washing basin 40, a cover tank 50, a remote control 60, a human sensor 70, a seating sensor 80, and a controller 90.

[0015] The base plate 3 is attached to the upper surface of the rear of the toilet body 11. On the upper surface of the base plate 3, a flush water tank 30 is placed.

[0016] The flush water tank 30 is located above the base plate 3, behind and above the toilet bowl 10, and is attached to the upper surface of the base plate 3. Flush water for flushing the toilet body 11 is supplied to the flush water tank 30 from a water supply device (not shown), and the flush water tank 30 stores the supplied flush water.

[0017] The hand washing basin 40 is located above the flush water tank 30. However, this is not limited to this, and for example, if a cabinet is provided on the rear side of the toilet unit 100, the hand washing basin 40 may be located above the cabinet other than above the flush water tank 30. The hand washing basin 40 comprises a hand washing basin 41 and a hand washing water outlet 42.

[0018] Hand wash basin 41 is formed by recessing the upper surface of cover lid 52 of cover tank 50, which will be described later. Hand wash basin 41 receives washing water for hand washing that is discharged from hand wash water outlet 42. A drain outlet (not shown) is formed at the bottom of hand wash basin 41. The washing water received in hand wash basin 41 is supplied to washing water tank 30 via the drain outlet and stored therein.

[0019] Hand-washing water outlet 42 is provided so as to protrude forward from the front surface of the rear wall of hand-washing basin 41. Water outlet 42a of hand-washing water outlet 42 opens downward and ejects wash water toward hand-washing basin 41.

[0020] The cover tank 50 accommodates the flush water tank 30 inside. The cover tank 50 is an outer tank that covers the flush water tank 30, which is an inner tank, from the outside. The cover tank 50 comprises a cover body 51 and a cover lid 52.

[0021] Cover body 51 is cylindrical and has an open top, and houses flush water tank 30 inside. Cover lid 52 is attached to the top of cover body 51 so as to close the opening of cover body 51. The above-mentioned hand washing basin 41 is formed on the top surface of cover lid 52.

[0022] In this embodiment, the cover tank 50 is made up of two members, the cover main body 51 and the cover lid 52, but is not limited to this. For example, the cover main body 51 and the cover lid 52 may be integrally molded, and the cover tank 50 may be made up of one member.

[0023] The remote control 60 is detachably attached to a wall or the like of the toilet room in which the toilet unit 100 is placed. The remote control 60 is a device that can remotely control various functions of the toilet unit 100 that is equipped with the flush water tank apparatus 1. The remote control 60 has an operation unit on its exterior that can be operated by the user, and has a control unit and communication unit inside. There are no particular limitations on the communication method of the remote control 60, and it transmits signals using communication methods such as infrared or BLE (registered trademark) to remotely control various functions. The remote control 60 may be either battery-powered or rechargeable battery-powered.

[0024] The human presence sensor 70 is attached to the front surface of the cover body 51 of the cover tank 50. However, the location where the human presence sensor 70 is attached is not particularly limited, and it may be attached anywhere as long as it can detect the presence of a user. The human presence sensor 70 detects the presence of a user entering or exiting the toilet room. The human presence sensor 70 detects the presence of a user using, for example, infrared rays.

[0025] The seat sensor 80 detects when a user sits on the toilet seat 12, and detects when the user leaves the toilet seat 12. The seat sensor 80 may be a photoelectric sensor using infrared rays or the like, a load-type sensor, or a capacitance-type sensor. For example, when a photoelectric sensor using infrared rays or the like is used, the seat sensor 80 is disposed in a functional section at the rear of the toilet bowl 10 as shown in FIG. 1, and when a load-type sensor or capacitance-type sensor is used, the seat sensor 80 is disposed on the toilet seat 12.

[0026] The controller 90 is placed inside the cover tank 50 of the flush water tank apparatus 1. The controller 90 comprises a circuit board on which a control unit (CPU) and a communication unit are mounted, and may also comprise a capacitor or battery for charging with power generated by a generator described below. The controller 90 receives signals from the remote control 60, human presence sensor 70 and seating sensor 80 described above, and controls the operation of the flush water tank apparatus 1 in accordance with the received signals. Operational control of the flush water tank apparatus 1 by the controller 90 will be described in detail later.

[0027] The flush water tank device 1 according to this embodiment is configured so that when a user operates the remote control 60, for example by pressing the flush start button, when the presence of a user in the toilet room is detected by the human presence sensor 70, or when the seat sensor 80 detects that a user has sat on or left the toilet seat, the controller 90 receives signals from the remote control, the human presence sensor, and the seat sensor, and flushes the toilet bowl 11a. When a signal from the human presence sensor 70 or the seat sensor 80 is received, the system may be configured to flush the toilet bowl 11a a predetermined time after the signal is received.

[0028] Next, the configuration of the flush water tank apparatus 1 according to this embodiment will be described. As shown in Figure 2, the flush water tank apparatus 1 comprises the above-mentioned flush water tank 30, a drain valve 31 that opens and closes the drain outlet 30a formed in the flush water tank 30, and a drain valve drive unit 21 that drives the drain valve 31 to open and close.

[0029] Drain outlet 30a is formed in the bottom of flush water tank 30. An overflow pipe 32 that discharges overflowing flush water directly into toilet bowl 11a is connected to the downstream side of drain outlet 30a. Drain valve 31 opens and closes drain outlet 30a by being pulled upward by drain valve drive unit 21, which will be described later.

[0030] Drain valve drive unit 21 uses the pressure of water supplied from the water main to flush water tank apparatus 1 to open and close drain valve 31. Drain valve drive unit 21 includes a cylindrical cylinder 21a into which water supplied via water supply control valve 24 (described below) and inlet channel 22a flows, a piston 21b that moves up and down within cylinder 21a, and a rod 21c that is connected to drain valve 31. Inside cylinder 21a, a spring 21f is disposed on top of piston 21b, urging piston 21b downward. An annular packing 21g is attached to the outer periphery of piston 21b, ensuring watertightness between the inner wall surface of cylinder 21a and piston 21b. A clutch 21h is provided midway along rod 21c; by disengaging clutch 21h, upper rod 21d and lower rod 21e are separated, and by engaging clutch 21h, upper rod 21d and lower rod 21e are connected.

[0031] An inlet passage 22a is connected to the lower end of the cylinder 21a. Water flowing out from the water supply control valve 24 flows into the cylinder 21a through the inlet passage 22a. The pressure of the water flowing into the cylinder 21a pushes the piston 21b upward against the biasing force of the spring 21f.

[0032] Outlet passage 22b is connected to the upper end of cylinder 21a. When piston 21b is pushed up above the connection point of outlet passage 22b, water that has flowed into cylinder 21a flows out into outlet passage 22b. Outlet passage 22b branches into first outlet passage 22c and second outlet passage 22d at the downstream end. First outlet passage 22c allows water to flow into flush water tank 30, and second outlet passage 22d allows water to flow into overflow pipe 32.

[0033] Rod 21c is connected to the underside of piston 21b, passes through a through-hole 21i formed in the bottom surface of cylinder 21a, and has its lower end connected to drain valve 31. When piston 21b is pushed upward, rod 21c lifts drain valve 31 upward, thereby opening drain valve 31.

[0034] Clutch 21h is configured to separate rod 21c into upper rod 21d and lower rod 21e when drain valve 31 is lifted a predetermined distance by rod 21c. A drain valve float mechanism 33 is provided near drain valve 31, and when clutch 21h separates lower rod 21e, buoyancy can be used to delay the closure of drain port 31a as a result of gravity causing lower rod 21e and drain valve 31 to descend. Drain valve float mechanism 33 includes float 33a and engaging portion 33b that moves in conjunction with float 33a.

[0035] Engagement portion 33b engages with lower rod 21e, which has been disengaged by clutch 21h and lowered, preventing lower rod 21e and drain valve 31 from descending and seating drain valve 31 in drain outlet 31a. When the water level in flush water tank 30 drops to a second predetermined water level that is lower than the predetermined water level, float 33a rotates engagement portion 33b, thereby releasing the engagement between engagement portion 33b and lower rod 21e. When the engagement is released, lower rod 21e and drain valve 31 resume their descent, and drain valve 31 seats in drain outlet 31a. This delays the closing of drain valve 31, allowing an appropriate amount of flush water to be discharged from drain outlet 31a.

[0036] As shown in Figure 2, the flush water tank device 1 also includes a generator 23 provided in the inlet passage 22a, which is a water supply passage to the drain valve drive unit 21, a water supply control valve 24 that supplies water to the drain valve drive unit 21 and the flush water tank 30, and a water supply valve float 39 attached to the water supply control valve 24.

[0037] The generator 23 is provided midway along the inflow path 22a connecting the water supply control valve 24 and the drain valve drive unit 21, and generates electricity from the flow of water supply that flows through the inflow path 22a. In this embodiment, the generator 23 is configured to be able to provide the power necessary to control the opening and closing of the solenoid valve, which will be described later. However, when the flush water tank device 1 is first driven, power from the generator 23 cannot be used and power must be supplied from another power source, so a configuration may be used in which power can be supplied by providing, for example, a dry cell battery. The generator 23 may be a turbine or water wheel equipped with blades that can receive the flow of water supply and convert it into rotational energy. The power generated by the generator 23 is charged into a capacitor or battery built into the controller 90. A vacuum breaker may be provided in the inflow path 22a between the water supply control valve 24 and the generator 23 to prevent backflow.

[0038] Water supply control valve 24 is connected to a first branch water supply channel 35 that branches off from water supply channel 34. Here, water supplied from the water main via water supply channel 34 is supplied to flush water tank apparatus 1 via stop valve 37, which is located on the outside of flush water tank 30, and constant flow valve 38, which is located inside flush water tank 30 downstream of stop valve 37. Stop valve 37 is provided to stop the supply of water to flush water tank apparatus 1 during maintenance, etc., and is normally used in an open state. Constant flow valve 38 is provided to allow water supplied from the water main to flow at a predetermined flow rate into water supply control valve 24 and hand wash water supply control valve 25, which will be described later, and a constant flow rate of water is supplied to water supply control valve 24 and hand wash water supply control valve 25 regardless of the installation environment of toilet unit 100.

[0039] The water supply control valve 24 allows the water supplied from the first branch water supply passage 35 to flow into the inflow passage 22a. The water that flows into the inflow passage 22a is used for power generation by the generator 23 as described above, and is then supplied to the drain valve drive unit 21.

[0040] The water supply control valve 24 includes a water supply valve main body 24a, a main valve element 24b disposed inside the water supply valve main body 24a, a float-side pilot valve 24c, and a solenoid valve-side pilot valve 24d. A water supply valve float 39 is connected to the float-side pilot valve 24c. A solenoid valve 27 is connected to the solenoid valve-side pilot valve 24d.

[0041] The water supply valve float 39 is disposed inside the flush water tank 30, and rises and falls according to the level of flush water in the flush water tank 30. The water supply valve float 39 is connected to the float-side pilot valve 24c by an arm portion 39a, and when the water supply valve float 39 rises and falls, the float-side pilot valve 24c moves via the arm portion 39a.

[0042] The solenoid valve 27 operates based on an instruction signal from the controller 90, which receives a signal from any one of the remote control 60, the human sensor 70, and the seating sensor 80. The solenoid valve 27 operates using power generated by the generator 23 and charged in a capacitor or battery built into the controller 90.

[0043] In this embodiment, the solenoid valve 27 can be opened or closed by the user's operation of the remote control 60, and the energization time of the solenoid valve 27 can be set appropriately. For example, the energization time can be set arbitrarily, or the user can select from predetermined modes as appropriate.

[0044] There are no particular limitations on the placement of solenoid valve 27. It may be placed inside flush water tank 30, which is an inner tank, or it may be placed outside flush water tank 30 and inside cover tank 50, which is an outer tank.

[0045] If the solenoid valve 27 is located outside the flush water tank 30 and inside the cover tank 50, which is an outer tank, then the connecting flow path connecting the solenoid valve 27 and the solenoid valve-side pilot valve 24d of the water supply control valve 24 is arranged from the outside to the inside of the flush water tank 30. In this case, the first branch water supply path 35 and constant flow valve 38 may also be arranged on the outside of the flush water tank 30. Also, for example, if the flush water tank 30 is equipped with a lid, the first branch water supply path 35 and the above-mentioned connecting flow path may be arranged from the outside of the lid, passing through the lid and through the inside of the flush water tank 30.

[0046] The solenoid valve 27 includes, for example, a cylindrical solenoid coil (none of which are shown) that generates an electromagnetic force generated by energization as a driving force, a plunger housed in the hollow portion of the solenoid coil that can move axially by the electromagnetic force and has the above-mentioned solenoid valve side pilot valve 24d connected to its tip, and a coil spring that presses the solenoid valve side pilot valve 24d against the main valve body 24b of the hand-washing water supply control valve 24 when the valve is closed.

[0047] Unlike solenoid valve 26, which will be described later, there is no need to use a bistable latching solenoid coil for solenoid valve 27, which maintains its state even when power is cut off. This is because water supply control valve 24 can be closed by the operation of water supply valve float 39.

[0048] Specifically, the water supply control valve 24 operates as follows. Normally, that is, when the solenoid coil is not energized, the solenoid valve-side pilot valve 24d closes the pilot valve port by the biasing force of a coil spring. On the other hand, when the solenoid coil is energized for a predetermined time based on a command signal from the controller 90, the electromagnetic force acting between the solenoid coil and the plunger pulls the solenoid valve-side pilot valve 24d away from the pilot valve port, opening the pilot valve port. In this way, by operating the solenoid valve 27 to move the solenoid valve-side pilot valve 24d, the pilot valve port of the main valve element 24b of the water supply control valve 24 is opened. As a result, based on the operation of the solenoid valve 27, the main valve element 24b of the water supply control valve 24 opens, water supply to the drain valve drive unit 21 begins, and the drain valve drive unit 21 operates to open the drain valve 31.

[0049] Furthermore, in response to the rise and fall of the water supply valve float 39 caused by the rise and fall of the flush water level in the flush water tank 30, the float-side pilot valve 24c moves via the arm portion 39a. The float-side pilot valve 24c moves and seats on or off from a pilot valve port (not shown) provided in the water supply valve main body 24a, thereby opening and closing the pilot valve port. This causes the pressure in a pressure chamber (not shown) provided in the water supply valve main body 24a to rise and fall, causing the main valve body 24b to seat and lift off from the valve seat, thereby opening and closing the main valve body 24b. In this way, the water supply control valve 24 opens and closes.

[0050] As shown in Figure 2, the flush water tank device 1 also includes a hand wash water supply control valve 25 that supplies water to the hand wash basin 40, and an electromagnetic valve 26 that is attached to the hand wash water supply control valve 25 and operates using electricity generated by the generator 23.

[0051] Hand-washing water supply control valve 25 is configured to control the water supply to hand-washing water outlet 42 of hand-washing basin 40 based on the operation of solenoid valve 26. In other words, solenoid valve 26, which constitutes the first solenoid valve of the present disclosure, controls the discharge and stopping of water from hand-washing water outlet 42.

[0052] Hand-washing water supply control valve 25 is connected to second branch water supply line 36, which branches off from water supply line 34, which is connected to the water main. Hand-washing water supply control valve 25 is connected downstream of second branch water supply line 36, and controls the supply and stop of water flowing in from second branch water supply line 36 to hand-washing water outlet 42 based on instruction signals from controller 90. Hand-washing water supply control valve 25 is connected to hand-washing water supply line 29, and supplies washing water for hand-washing to hand-washing water outlet 42 via hand-washing water supply line 29.

[0053] Hand wash water supply control valve 25 comprises hand wash water supply valve main body 25a, main valve element 25b arranged inside hand wash water supply valve main body 25a, and solenoid valve-side pilot valve 25c. Solenoid valve-side pilot valve 25c is connected to solenoid valve 26. Hand wash water supply control valve 25 differs from water supply control valve 24 described above in that float-side pilot valve 24c is replaced with solenoid valve-side pilot valve 25c. The drive source for float-side pilot valve 24c is water supply valve float 39, while the drive source for solenoid valve-side pilot valve 25c is solenoid valve 26.

[0054] The solenoid valve 26 operates based on an instruction signal from the controller 90, which receives a signal from any one of the remote control 60, the human sensor 70, and the seating sensor 80. The solenoid valve 26 operates using power generated by the generator 23 and charged in a capacitor or battery built into the controller 90.

[0055] In this embodiment, the solenoid valve 26 can be opened or closed by the user's operation of the remote control 60, and the energization time of the solenoid valve 26 can be set appropriately. For example, the energization time can be set to any desired time, or the user can select from a variety of predetermined modes as appropriate.

[0056] There are no particular limitations on the placement of the solenoid valve 26. It may be placed inside the flush water tank 30, which is an inner tank, or it may be placed outside the flush water tank 30 and inside the cover tank 50, which is an outer tank.

[0057] If solenoid valve 26 is located outside flush water tank 30 and inside cover tank 50, which is the outer tank, then the connecting flow path connecting solenoid valve 26 and solenoid valve side pilot valve 25c of hand wash water supply control valve 25 is arranged from the outside to the inside of flush water tank 30. Also, if flush water tank 30 is equipped with a lid, for example, then the connecting flow path may be arranged from the outside of the lid, passing through the lid and through the inside of flush water tank 30.

[0058] The solenoid valve 26 includes, for example, a cylindrical solenoid coil (none of which are shown) that generates an electromagnetic force generated by energization as a driving force, a plunger housed in the hollow portion of the solenoid coil that can move axially by the electromagnetic force and has the above-mentioned solenoid valve side pilot valve 25c connected to its tip, and a coil spring that presses the solenoid valve side pilot valve 25c against the main valve body 25b of the hand-washing water supply control valve 25 when the valve is closed.

[0059] Specifically, hand-washing water supply control valve 25 operates as follows. Normally, that is, when the solenoid coil is not energized, solenoid-valve-side pilot valve 25c closes the pilot valve port by the biasing force of a coil spring. On the other hand, when the solenoid coil is energized for a predetermined time based on a command signal from controller 90, electromagnetic force acting between the solenoid coil and the plunger pulls solenoid-valve-side pilot valve 25c away from the pilot valve port, opening the pilot valve port. In this way, by operating solenoid valve 26 and moving solenoid-valve-side pilot valve 25c, the pilot valve port of main valve element 25b of hand-washing water supply control valve 25 is opened and closed based on the operation of solenoid valve 26, and water discharge and stop of hand-washing water discharge portion 42 are controlled.

[0060] The solenoid valve 26 may be a bistable latching solenoid coil, which moves the solenoid valve-side pilot valve 25c when energized and maintains that state even when de-energized. In this case, energizing the solenoid valve again in the opposite direction returns the solenoid valve-side pilot valve 25c to its original position. This is expected to result in reduced power consumption.

[0061] The flush water tank apparatus 1 according to this embodiment, which is configured as described above, operates as follows.

[0062] First, in the standby state, when the flush water level in the flush water tank 30 is at a predetermined level, the water supply valve float 39 is at the predetermined level and no current is supplied to the solenoid valves 26, 27, so both the water supply control valve 24 and the hand wash water supply control valve 25 are closed. From this standby state, for example, if a user presses the flush button on the remote control 60, or if the presence of a user is detected by the human presence sensor 70, or if the user leaving the seat is detected by the seat sensor 80, a toilet flush command signal is sent from the remote control 60 or from each of these sensors, and when this is received by the controller 90, it begins supplying current to each of the solenoid valves 26, 27.

[0063] When solenoid valve 26 is energized for a predetermined time, solenoid valve-side pilot valve 25c is released from the pilot valve port of main valve body 25b for a predetermined time. This reduces the pressure in the pressure chamber of hand-wash water supply control valve 25, causing main valve body 25b to release from its valve seat and remain open for a predetermined time. When hand-wash water supply control valve 25 is opened, wash water is supplied to hand-wash water outlet 42 via hand-wash water supply passage 29, and wash water is discharged from hand-wash water outlet 42. The wash water discharged into hand-wash basin 41 is supplied to wash water tank 30 and stored therein.

[0064] If a bistable latching solenoid coil, which maintains its state even when de-energized, is used as solenoid valve 26, it is preferable to provide a float switch capable of detecting the water level in flush water tank 30. In this case, when the water level in flush water tank 30 rises to a predetermined level, the float switch detects this and sends a signal to controller 90. When controller 90 detects via the float switch that the water level in flush water tank 30 has reached the predetermined level, it re-energizes solenoid valve 26. This causes solenoid valve 26 to move the solenoid valve-side pilot valve toward main valve element 25b of hand-wash water supply control valve 25, closing the pilot valve port of main valve element 25b. As a result, the pressure in the pressure chamber within hand-wash water supply control valve 25 rises, moving main valve element 25b and closing hand-wash water supply control valve 25.

[0065] On the other hand, when the solenoid valve 27 is energized, the solenoid valve-side pilot valve moves away from the pilot valve port of the main valve body, which reduces the pressure in the pressure chamber of the water supply control valve 24, causing the main valve body 24b to move away from the valve seat and open the water supply control valve 24.

[0066] When the water supply control valve 24 is opened, the tap water supplied to the water supply control valve 24 flows into the inflow passage 22a, generating electricity by the generator 23. The generated electricity is charged into a capacitor or a battery built into the controller 90.

[0067] The water that flows through inflow channel 22a flows into cylinder 21a of drain valve drive unit 21 and pushes up piston 21b, which in turn pulls up rod 21c connected to piston 21b and drain valve 31, opening drain outlet 30a and discharging flush water, thereby flushing toilet bowl 11a of toilet 10.

[0068] When flush water is discharged from flush water tank 30 and the water level in flush water tank 30 drops, water supply valve float 39 descends, and float-side pilot valve 24c leaves the pilot valve port of main valve body 24b via arm portion 39a, leaving the pilot valve port open. Then, the pressure in the pressure chamber of water supply valve main body 24a of water supply control valve 24 drops, causing main valve body 24b to leave the valve seat, and water supply control valve 24 remains open.

[0069] Meanwhile, when water flows from inlet channel 22a into cylinder 21a of drain valve drive unit 21 and piston 21b is pushed up to the top of cylinder 21a, the water in cylinder 21a flows out through outlet channel 22b. The water that flows out through outlet channel 22b flows into flush water tank 30 through first outlet channel 22c, and flows into overflow pipe 32 through second outlet channel 22d.

[0070] Furthermore, when piston 21b is pushed up, and as a result rod 21c and drain valve 31 are raised to a predetermined position, clutch 21h separates lower rod 21e and drain valve 31 from upper rod 21d. The separated lower rod 21e and drain valve 31 descend under their own weight. At this time, the separated lower rod 21e engages with engaging portion 33b of drain valve float mechanism 33, preventing lower rod 21e and drain valve 31 from descending. As a result, drain port 30a of flush water tank 30 remains open, and water continues to drain from flush water tank 30.

[0071] Next, when the water level in the flush water tank 30 drops to a second predetermined water level that is lower than the predetermined water level, float 33a of drain valve float mechanism 33 drops further, causing engagement portion 33b to rotate. This releases engagement between lower rod 21e and engagement portion 33b, and lower rod 21e and drain valve 31 begin to descend again. Drain valve 31 then closes drain outlet 30a of flush water tank 30, stopping the discharge of flush water into toilet bowl 11a. Even after drain outlet 30a is closed, water supply control valve 24 remains open as described above, so the water level in flush water tank 30 rises.

[0072] When the water level in the flush water tank 30 rises to a predetermined level, the water supply valve float 39 rises, and the float-side pilot valve 24c moves via the arm portion 39a, closing the pilot valve port. This increases the pressure in the pressure chamber in the water supply valve main body 24a, closing the main valve body 24b and closing the water supply control valve 24.

[0073] When water supply control valve 24 is closed, the water supply from water supply control valve 24 to drain valve drive unit 21 and the water supply to flush water tank 30 are stopped, and the generation of electricity by generator 23 ends. In addition, piston 21b of drain valve drive unit 21 is pushed down by the biasing force of spring 21f. When upper rod 21d is pushed down together with piston 21b, upper rod 21d and lower rod 21e, which had been separated by clutch 21h, are reconnected. This ends the toilet flush and returns to the standby state.

[0074] According to this embodiment, the following effects are achieved.

[0075] Flush water tank device 1 according to this embodiment is provided with solenoid valve 26 as a first solenoid valve that starts and stops water spouting from hand-washing water outlet 42, and hand-washing water supply control valve 25. Therefore, hand-washing water supply control valve 25 can be controlled to open and close in response to a command signal from controller 90. In conventional hand-washing flush water tank devices, the supply of flush water to the hand-washing water outlet depends on the amount of flush water in the flush water tank, and so flush water could not be discharged from the hand-washing water outlet except when the amount of flush water in the flush water tank had decreased due to flushing of the toilet bowl. In contrast, this embodiment allows hand-washing water outlet 42 to start and stop spouting at any desired timing, regardless of the amount of flush water in flush water tank 30. For example, hand-washing water spouting can start before drain valve 31 opens and flushing of toilet bowl 11a begins.

[0076] Furthermore, in the past, the water supply passage remained closed from the time the flush water tank drain valve opened and flushing of the toilet bowl began until the flush water level in the flush water tank dropped to a predetermined level, which delayed the supply of flush water to the hand-washing water outlet and caused a delay in the timing of flushing water from the hand-washing water outlet. In contrast, according to this embodiment, solenoid valve 26 can be controlled to open and close in response to a command signal from controller 90, so hand-washing water supply control valve 25 can be controlled to open and close without any delay in timing, and water can be discharged and stopped from hand-washing water outlet 42 without delay.

[0077] In addition, in conventional systems, flush water discharged from the hand-washing water outlet is stored in the flush water tank, and even after the flush water level in the flush water tank reaches a predetermined level and the supply of flush water from the tap is stopped, flush water from the hand-washing basin continues to be supplied to the flush water tank. As a result, the flush water level stored in the flush water tank exceeds the predetermined level, delaying the supply of flush water to the hand-washing water outlet, further delaying the timing of flush water discharge from the hand-washing water outlet. In addition, because the amount of flush water in the flush water tank fluctuates depending on whether or not a hand-washing basin is installed, it is necessary to set the nominal water volume with a margin of error. In contrast, according to this embodiment, solenoid valve 26 and hand-washing water supply control valve 25 can be controlled to open and close in response to command signals from controller 90, allowing for flexible setting of the timing of water discharge from hand-washing water outlet 42 and the timing of water stoppage. Therefore, according to this embodiment, delays in the timing of water discharge can be avoided and fluctuations in the amount of flush water in the flush water tank 30 due to the presence or absence of a hand washing basin can be suppressed, so there is no need to leave a large margin for setting the nominal water volume, which is advantageous from a design perspective.

[0078] Furthermore, in this embodiment, the supply of flush water to hand-washing water outlet 42 does not depend on the amount of flush water in flush water tank 30, so when water supply control valve 24 is closed, for example, a large flow rate of flush water can be supplied to hand-washing water outlet 42, and water can be discharged in a waterfall-like manner, for example. The water discharged from hand-washing water outlet 42 can also be used for manual toilet flushing using a care support faucet or hose.

[0079] In the above embodiment, appropriate modifications can be made without departing from the spirit of the present disclosure. For example, in the above embodiment, the main valve element is opened and closed by a pilot valve driven by a solenoid valve, but the main valve element can also be opened and closed directly by a solenoid valve.

[0080] [Second embodiment] Flush water tank apparatus 1A according to the second embodiment differs from the first embodiment in that it is equipped with a power cord that supplies power to flush water tank apparatus 1A from the outside, but other configurations are the same as those of embodiment 1. However, other configurations are not limited to this, and this embodiment may be applied to a flush water tank apparatus that does not have a generator 23 or hand washing basin 40, for example.

[0081] As shown in Figure 3, the flush water tank apparatus 1A according to this embodiment is provided with a power cord 91 that supplies power to the flush water tank apparatus 1A from an external source in case there is a possibility that the power generated by the generator 23 will not be enough to cover the power required to control the opening and closing of the solenoid valve 26, etc. The power cord 91 connects the controller 90 to an external power source, and supplies power from the external power source to the controller 90.

[0082] In this embodiment, the power cord 91 is inserted through an opening 53 formed between the cover body 51 and the cover lid 52 and connected to an external power source. Examples of the external power source include a commercial power source.

[0083] According to this embodiment, by inserting the power cord 91 connected to the controller 90 located inside the flush water tank 30, which is the inner tank, into the opening 53 formed between the cover body 51, which is the outer tank, and the cover lid 52, it is possible to prevent the power cord 91 from getting wet with the flush water inside the flush water tank 30. Therefore, according to this embodiment, power can be more reliably supplied from an external power source to the controller 90 of the flush water tank device 1A.

[0084] [Third embodiment] Flush water tank apparatus 1B according to the third embodiment differs from the second embodiment in the arrangement of the power cord that supplies power to flush water tank apparatus 1B from the outside, but other configurations are the same as those of the first and second embodiments. However, other configurations are not limited to this, and this embodiment may be applied to a flush water tank apparatus that does not have a generator 23 or hand washing basin 40, for example.

[0085] As shown in Figure 4, flush water tank apparatus 1B according to this embodiment is provided with a power cord 92 that supplies power to flush water tank apparatus 1B from an external source in case there is a possibility that the power generated by generator 23 will not be enough to cover the power required to control the opening and closing of solenoid valve 26, etc. Power cord 92 connects controller 90 to an external power source, and supplies power from the external power source to controller 90.

[0086] In this embodiment, the power cord 92 is inserted through the bottom of the cover body 51, more specifically, through an opening 54 formed in the bottom surface, and connected to an external power source. Examples of external power sources include commercial power sources. The toilet seat 12 is often equipped with a heater and various sensors, and the toilet seat 12 is often connected to an external power source to supply power to these. In such cases, the toilet seat 12 and the controller 90 may be connected by the power cord 92, and the controller 90 may be connected to the external power source via the toilet seat 12 to supply power.

[0087] According to this embodiment, by inserting the power cord 92 connected to the controller 90 located inside the flush water tank 30, which is the inner tank, into the opening 54 formed in the bottom of the cover body 51, which is the outer tank, it is possible to prevent the power cord 92 from getting wet with the flush water inside the flush water tank 30. Therefore, according to this embodiment, power can be more reliably supplied from an external power source to the controller 90 of the flush water tank device 1B.

[0088] [Fourth embodiment] Flush water tank apparatus 1C according to the fourth embodiment differs from the first embodiment in that it is equipped with a manual lifting mechanism that can manually raise and lower water supply valve float 39, but other configurations are the same as those of embodiment 1. However, other configurations are not limited to this, and this embodiment may be applied to a flush water tank apparatus that does not have a generator 23 or hand wash basin 40, for example.

[0089] As shown in Figure 5, the flush water tank apparatus 1C according to this embodiment is equipped with a manual lifting mechanism 39b that can manually raise and lower the water supply valve float 39. The manual lifting mechanism 39b is arranged on the outside of the flush water tank 30C, and is configured so that the user can manually push and pull the water supply valve float 39 through an opening 39c formed in the flush water tank 30C. For example, as shown in Figure 5, one example is a structure that has an operating unit such as an operation button connected to the top surface of the water supply valve float 39 by a rod-shaped member. If a rod-shaped member is used, the structure can be such that it is pushed from above, and if a string-shaped member is used instead of a rod-shaped member, the structure can be such that it is pulled from below, allowing the water supply valve float 39 to be manually raised and lowered.

[0090] According to this embodiment, in a flush water tank apparatus 1C equipped with a solenoid valve 26 and the like, even if manual operation of the flush water tank apparatus 1C is required in the event of a power outage or malfunction, the water supply valve float 39 can be manually raised and lowered using the manual lifting mechanism 39b. As a result, the water supply control valve 24 can be opened and closed manually, so water can be manually supplied to the drain valve drive section 21 and flush water tank 30C. In addition, the drain valve 31 can be opened and closed manually to drain flush water.

[0091] [Fifth embodiment] Flush water tank apparatus 1D according to the fifth embodiment differs from the first embodiment in that it is equipped with a manual opening and closing mechanism that allows solenoid valves 26, 27 to be opened and closed manually, but other configurations are the same as those of embodiment 1. However, other configurations are not limited to this, and this embodiment may be applied to a flush water tank apparatus that does not have a generator 23 or a hand-washing basin 40, for example.

[0092] As shown in Figure 6, flush water tank apparatus 1D according to this embodiment is equipped with manual opening and closing mechanism 26a that can manually open and close solenoid valve 26, and manual opening and closing mechanism 27a that can manually open and close solenoid valve 27. Manual opening and closing mechanisms 26a, 27a may be located inside or outside flush water tank 30. Specifically, they are configured so that the user can manually push and pull plungers provided inside solenoid valves 26, 27. By manually pushing and pulling the plungers, the pilot valve port can be manually opened and closed, and hand wash water supply control valve 25 and water supply control valve 24 can be manually opened and closed.

[0093] According to this embodiment, in flush water tank apparatus 1D equipped with solenoid valves 26, 27, etc., even if manual operation of flush water tank apparatus 1D becomes necessary due to a power outage, malfunction, etc., solenoid valves 26, 27 can be manually opened and closed using manual opening and closing mechanisms 26a, 27a. Therefore, hand wash water supply control valve 25 and water supply control valve 24 can be manually opened and closed, so water can be manually supplied to hand wash water discharge section 42 and water can be supplied to drain valve drive section 21, and water discharge and water discharge from hand wash water discharge section 42, and water supply and drainage of flush water tank 30, and these can be stopped manually.

[0094] [Sixth embodiment] Flush water tank apparatus 1E pertaining to the sixth embodiment differs from the first embodiment in that it is equipped with an ejector in the communication passage that connects inflow passage 22a and drainage passage 30b, and in that it is not equipped with overflow pipe 32 and the downstream end of outflow passage 22b is not branched, but the other configurations are the same as those of the first embodiment. However, the other configurations are not limited to this, and this embodiment may be applied to a flush water tank apparatus that is not equipped with a generator 23 or a hand washing basin 40, for example.

[0095] 7, flush water tank apparatus 1E according to this embodiment comprises inflow channel 22a, which is a drive section water supply channel to drain valve drive section 21, drain channel 30b through which flush water discharged from drain outlet 30a flows, a communication passage 22e that connects inflow channel 22a and drain channel 30b, and ejector 28, which is arranged at junction 30e of communication passage 22e and drain channel 30b. Ejector 28 generates negative pressure by discharging flush water in inflow channel 22a via communication passage 22e into drain channel 30b, and uses this negative pressure to forcefully discharge flush water in flush water tank 30, which is discharged from drain outlet 30a when drain valve 31 is open, into toilet bowl 11a.

[0096] According to this embodiment, in a flush water tank apparatus 1E equipped with a solenoid valve 26 and the like, by providing an ejector 28 at connection 30e between communication passage 22e and drainage channel 30b, drainage into drainage channel 30b can begin before drainage valve 31 opens, avoiding delays in drainage. Also, due to the drainage effect of ejector 28 using negative pressure, a large flow rate of flush water can be forcefully discharged at the same time as drainage valve 31 opens, improving drainage performance.

[0097] [Seventh embodiment] The flush water tank apparatus 1F according to the seventh embodiment differs from the first embodiment in that it does not include a hand wash basin 40, a hand wash water supply control valve 25, or a water supply control valve 24, and therefore the water supply passage 34f is not branched, and the drain valve drive section 21 is composed of a flush valve 15 equipped with a second solenoid valve 16; the other configurations are the same as those of the first embodiment. However, the other configurations are not limited to this, and this embodiment may be applied to a flush water tank apparatus that does not include a generator 23, for example.

[0098] As shown in Figure 8, the flush water tank device 1F of this embodiment further includes a flush valve 15 that uses the pressure of the water supply to the flush water tank device 1F to open and close the drain valve 31, and a second solenoid valve 16 that supplies water to the flush valve 15 and stops the water supply.

[0099] Similar to the above-mentioned drain valve drive unit 21, flush valve 15 uses the pressure of water supplied from the water line to flush water tank apparatus 1F to open and close drain valve 31. Flush valve 15 comprises a cylindrical cylinder 15a into which water supplied via water supply passage 34f flows, a piston 15b that slides up and down within cylinder 15a, an upper space 15c formed above piston 15b as a pressure chamber, and a rod 21c.

[0100] A small through-flow passage 15f is formed inside the piston 15b, penetrating from the water supply passage 34f side to the upper space 15c. The upper space 15c is a space surrounded by the inner wall surface of the cylinder 15a and the top surface of the piston 15b. Water that flows into the cylinder 15a via the water supply passage 34f is supplied to this upper space 15c via the through-flow passage 15f of the piston 15b, causing high pressure within the upper space 15c.

[0101] The flush valve 15 also includes a first pressure release pilot valve 15d and a second pressure release pilot valve 15e provided at the upper end of the cylinder 15a, a second solenoid valve 16 connected to the first pressure release pilot valve 15d, and a float 17 connected to the second pressure release pilot valve 15e. The first pressure release pilot valve 15d and the second pressure release pilot valve 15e have the same configuration as the float-side pilot valve 24c and the solenoid-valve-side pilot valve 25c of the first embodiment. The second solenoid valve 16 has the same configuration as the solenoid valve 26 of the first embodiment. The float 17 has the same configuration as the water supply valve float 39 of the first embodiment.

[0102] A water supply passage 34f is connected to the lower end of the cylinder 15a. Water supplied from a water main flows into the cylinder 15a via the water supply passage 34f. As described above, the water that flows into the cylinder 15a via the water supply passage 34f flows into the upper space 15c via the through-flow passage 15f of the piston 15b. When the second solenoid valve 16 is opened and the first pressure release pilot valve 15d is opened to release the pressure in the upper space 15c, the piston 15b begins to move upward, and the water that has flowed into the cylinder 15a enters the gap created below the piston 15b and pushes the piston 15b upward.

[0103] Rod 21c is connected to the underside of piston 15b, passes through a through-hole 15i formed in the bottom surface of cylinder 15a, and has its lower end connected to drain valve 31. When piston 15b is pushed upward, rod 21c lifts drain valve 31 upward, thereby opening drain valve 31.

[0104] The rod 21c, the clutch 21h, and the drain valve float mechanism 33 have the same configuration as in the first embodiment.

[0105] Next, the operation of the flush valve 15 will be described with reference to Figures 9 to 13. Note that in Figures 9 to 13, the configuration is omitted as appropriate.

[0106] As shown in Figure 9, when the water flow is stopped, the flush valve 15 is closed because water flows into the upper space 15c through the through flow path 15f, causing pressure to build up and become high, pressing the piston 15b downward.

[0107] As shown in Figure 10, at startup, the pressure in the upper space 15c of the flush valve 15 is high, and the second solenoid valve 16 opens, opening the first pressure release pilot valve 15d to release the pressure in the upper space 15c. Then, the piston 15b starts to move upward. At this time, the water that has flowed into the cylinder 15a enters the space created below the piston 15b, pushing the piston 15b upward.

[0108] 11, during the opening operation of the flush valve 15, the water that has flowed into the cylinder 15a further enters the space below the piston 15b, pushing the piston 15b sufficiently upward. At this time, the drain valve 31 is further lifted by the rod 21c, and the drain valve 31 is opened.

[0109] As shown in Figure 12, during the closing operation, when drain valve 31 is lifted up a predetermined distance by rod 21c, flush valve 15 separates rod 21c into upper rod 21d and lower rod 21e by clutch 21h. The separated lower rod 21e descends together with drain valve 31 due to its own weight, and drain valve 31 is closed. Also, as the flush water level in flush water tank 30 drops, float 17 descends and second pressure release pilot valve 15e opens. At this time, second solenoid valve 16 closes and first pressure release pilot valve 15d closes. Also, water flows into the space below cylinder 15a via water supply passage 34f, is discharged from opening 15g on the bottom of cylinder 15a and is stored in flush water tank 30.

[0110] As shown in Figure 13, during the subsequent closing operation, flush valve 15 discharges flush water from opening 15g on the bottom surface of cylinder 15a, causing the flush water level in flush water tank 30 to rise, causing float 17 to rise and second pressure release pilot valve 15e to close. At this time, water also flows into upper space 15c via through passage 15f of piston 15b, increasing the pressure in upper space 15c and pushing piston 15b downward. When piston 15b has been pushed downward sufficiently, the water stops flowing.

[0111] According to this embodiment, in a flush water tank apparatus 1F equipped with a solenoid valve, a flush valve 15 equipped with a second solenoid valve 16 is provided to drive the drain valve 31 to open and close. This makes it possible to use the pressure of the water supply to the flush water tank apparatus 1F to drive the drain valve 31 to open and close by the flush valve 15. As a result, there is no need for a flush handle in the flush water tank apparatus, improving the external design.

[0112] 14, the first pressure release pilot valve 15d and the second pressure release pilot valve 15e may be provided in the outflow path 18 from the upper end of the cylinder 15a, rather than being provided directly on the cylinder 15a. With the first pressure release pilot valve 15d and the second pressure release pilot valve 15e provided directly on the cylinder 15a, there is a possibility that the flow rate will be insufficient and the valves will not open, but according to this modification 1, by providing the first pressure release pilot valve 15d and the second pressure release pilot valve 15e in the outflow path 18, they can be used as the primary flow path for a small valve for operating the piston 15b, making it possible to open and close the flush valve 15G.

[0113] Furthermore, as in the flush water tank device 1H relating to variant example 2 of this embodiment shown in Figure 15, by branching the water supply passage 34 into a first branch water supply passage 35h and a second branch water supply passage 36h, and using the second branch water supply passage 36h as a branch water supply passage for the shower toilet 14, the piping can be arranged inside the flush water tank 30, making it possible to keep things neat.

[0114] Furthermore, by attaching a magnetic ring 34h to the water supply passage 34, as in the flush water tank device 1H relating to variant example 2 of this embodiment shown in Figure 15, it is possible to create a structure that adsorbs metallic foreign matter in the water supply and prevents the foreign matter from flowing to the secondary side.

[0115] Furthermore, as in the flush water tank device 1H relating to variant example 2 of this embodiment shown in Figure 15, a first pressure release pilot valve 15d and a second pressure release pilot valve 15e are provided in the outflow path 18 to form the primary flow path of a small valve for operating the piston 15b, and by providing a structure to manually and mechanically open the valve, it can be operated even during a power outage, and the piston can be operated at the same time as the valve is opened.

[0116] Furthermore, as in flush water tank apparatus 1H according to modified example 2 of this embodiment shown in Figure 15, by providing through passage 15h with a diameter equal to or greater than that of through passage 15f inside piston 15b in addition to through passage 15f for operation, it is possible to speed up the operation of piston 15b and improve the responsiveness of drain valve 31. Furthermore, because improving responsiveness causes a strong impact when the valve is closed, which can cause abnormal noise, an on-off valve 15j can be provided in through passage 15h so that it returns to its original through passage 15f when the valve is closed. [Explanation of symbols]

[0117] 1, 1A~1H Cleaning water tank device 10 Toilet 11 Toilet bowl body 11a Toilet bowl 12 toilet seats 13 Toilet lid 21 Drain valve drive unit 22a Inflow channel (drive section supply channel) 22b Outflow channel 22e Communication path 23 Generator 24 Water supply control valve 25 Hand wash water supply control valve (first solenoid valve) 26 Solenoid valve (first solenoid valve) 26a Manual opening / closing mechanism 28 Ejector 3 Base Plate 30,30C cleaning water tank 30a drain 30b Drainage channel 30e connection 31 Drain valve 39 Water supply valve float (water supply float valve) 39b Manual lifting mechanism 40 Hand Wash Basin 41 Hand Wash Basin 42 Hand wash faucet 42a Outlet 50 Cover Tank 51 Cover body 52 Cover lid 53,54 aperture 60 Remote Control 70 Human Sensor 80 Seat sensor 90 Controller 91,92 Power cord 100 Toilet Unit

Claims

1. a flush water tank in which flush water is stored and in which a drain port is formed for discharging the stored flush water into the flush toilet bowl; a hand-washing water discharge unit that discharges a portion of the flush water supplied to the flush water tank as hand-washing water; a hand washing basin that receives flush water discharged from the hand washing water discharge portion and supplies it to the flush water tank; A flush water tank device comprising: a first solenoid valve that starts and stops water discharge from the hand-washing water discharge section.

2. a drain valve that opens and closes the drain outlet and starts and stops the supply of flush water to the flush toilet; a flush valve that uses the pressure of water supplied to the flush water tank device to open and close the drain valve; 2. The flush water tank apparatus according to claim 1, further comprising: a second electromagnetic valve that starts and stops the supply of water to the flush valve.

3. The flush water tank apparatus according to claim 2 , further comprising a manual opening / closing mechanism that can manually open and close at least one of the first solenoid valve and the second solenoid valve.

4. a generator that generates electricity using the flow of water supplied to the flush water tank device; 3. The flush water tank apparatus according to claim 2, wherein at least one of the first solenoid valve and the second solenoid valve is operated by power generated by the generator.

5. 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 drive unit that uses the pressure of water supplied to the flush water tank device to open and close the drain valve; a water supply float valve that opens and closes by raising and lowering a float according to the level of flush water stored in the flush water tank, and stops the supply of water to at least the drain valve drive unit; The flush water tank apparatus according to claim 1 , further comprising a manual lifting mechanism that can manually raise and lower the float of the water supply float valve.

6. a drive unit water supply line to the drain valve drive unit; a drainage channel through which the cleaning water discharged from the drain outlet flows; a communication passage that communicates the drive unit water supply passage and the drainage passage; 6. The flush water tank apparatus according to claim 5, further comprising an ejector that is arranged at the connection between the communication passage and the drainage channel, and generates negative pressure by discharging flush water in the drive unit water supply channel through the communication passage into the drainage channel, and uses the negative pressure to discharge the flush water in the flush water tank that is discharged from the drain outlet into the flush toilet bowl.

7. a power cord for supplying power to the flush water tank device; a cover tank that covers the flush water tank, The cover tank includes a cover body having an open top surface and accommodating the flush water tank; a cover lid that closes the opening of the cover body, 3. The flush water tank apparatus according to claim 1, wherein the power cord is inserted through an opening formed between the cover body and the cover lid or an opening formed in the bottom of the cover body and connected to an external power source.

8. a remote controller capable of remotely operating the flush water tank device; A human presence sensor that detects the presence of a person; a seating sensor that detects whether a person sits on or leaves the toilet seat of the flush toilet; a controller that acquires signals from the remote control, the human presence sensor, and the seating sensor and controls the flush water tank device, 3. The flush water tank apparatus according to claim 2, wherein the controller controls the opening and closing of at least one of the first solenoid valve and the second solenoid valve based on signals from the remote control, the human presence sensor, and the seating sensor.

9. 3. The flush water tank apparatus according to claim 2, wherein at least one of the first electromagnetic valve and the second electromagnetic valve is disposed outside the flush water tank.

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