CN113574229A

CN113574229A - Washing water tank device and water-washing toilet device provided with same

Info

Publication number: CN113574229A
Application number: CN202180000525.3A
Authority: CN
Inventors: 林信宏; 北浦秀和; 志牟田晃大; 黑石正宏
Original assignee: Toto Ltd
Current assignee: Toto Ltd
Priority date: 2020-02-28
Filing date: 2021-02-05
Publication date: 2021-10-29
Anticipated expiration: 2041-02-05
Also published as: CN113574229B

Abstract

The invention provides a washing water tank device capable of precisely setting the amount of washing water to be discharged while opening a drain valve by a drain valve hydraulic drive unit, and a water closet device provided with the washing water tank device. The invention provides a cleaning water tank device, comprising: a drain valve hydraulic pressure drive unit (14); a clutch mechanism (30); a washing water amount selection unit (6); a timing control mechanism (46); and a valve control unit that engages the timing control mechanism with the drain valve when the first amount of cleaning water is selected, wherein the valve control unit causes the timing control mechanism to operate so as to release the engagement between the timing control mechanism (46) and the drain valve (12) when the first time elapses, engages the timing control mechanism with the drain valve when the second amount of cleaning water is selected, and causes the timing control mechanism (46) to operate so as to release the engagement between the timing control mechanism (46) and the drain valve (12) when the second time shorter than the first time elapses.

Description

Washing water tank device and water-washing toilet device provided with same

Technical Field

The present invention relates to a flush water tank device, and more particularly to a flush water tank device for supplying flush water to a flush toilet, and a flush toilet device provided with the flush water tank device.

Background

Japanese patent laid-open No. 2009 and 257061 (patent document 1) describes a low tank (low tank) device. In this low tank device, a hydraulic cylinder device having a piston and a drain portion is disposed inside a low tank having a drain valve, and the piston and the drain valve are connected by a connecting portion. When the flush water in the low tank is discharged, the solenoid valve is opened to supply water to the hydraulic cylinder device, thereby pushing the piston up. Since the piston is connected to the drain valve by the connection portion, the drain valve is lifted by the movement of the piston, the drain valve is opened, and the washing water in the low-level tank is discharged. The water supplied to the cylinder device flows out of the drain portion and flows into the low-level tank.

When the drain valve is closed, the electromagnetic valve is closed, and the supply of water to the cylinder device is stopped. The piston thus pushed up descends, and the drain valve returns to the valve-closed position by its own weight. At this time, the water in the cylinder device flows out little by little from the drain portion, and therefore, the piston is gradually lowered, and the drain valve is also gradually returned to the valve-closed position. In the low tank device described in patent document 1, the time for opening the electromagnetic valve is adjusted to vary the time for opening the drain valve, thereby realizing cleaning with different amounts of cleaning water, such as large cleaning and small cleaning.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2009-257061

Disclosure of Invention

Problems to be solved by the invention

However, the low-level tank device described in patent document 1 has a problem that it is difficult to precisely set the amount of washing water to be discharged. That is, in the low tank device described in patent document 1, since the water in the cylinder tube device is slightly drained from the drain portion after the electromagnetic valve is closed to close the drain valve, the lowering of the piston is slow, and it is difficult to set the valve opening time of the drain valve short. Further, since the lowering speed of the piston depends on the flow rate of water flowing out of the drain portion and the sliding resistance of the piston, the lowering speed may vary or may change with time. Therefore, in the low tank device described in patent document 1, it is difficult to precisely set the amount of the washing water to be discharged.

Accordingly, an object of the present invention is to provide a flush tank device capable of precisely setting the amount of flush water to be discharged while opening a discharge valve by using the water pressure of supplied water, and a flush toilet apparatus including the flush tank device.

Means for solving the problems

In order to solve the above problem, an embodiment of the present invention is a flush tank device for supplying flush water to a flush toilet, including: a water storage tank for storing the washing water to be supplied to the toilet bowl and having a water outlet for discharging the stored washing water to the toilet bowl; a drain valve that opens and closes the drain port, supplies the flush water to the flush toilet, and stops the supply of the flush water to the flush toilet; a drain valve hydraulic pressure drive unit that drives the drain valve by using a supply pressure of supplied tap water; a clutch mechanism that connects the drain valve to the drain valve hydraulic drive unit, lifts the drain valve by a driving force of the drain valve hydraulic drive unit, and cuts off the drain valve at a predetermined timing to lower the drain valve; a washing water amount selection unit capable of selecting a first washing water amount for washing the toilet and a second washing water amount smaller than the first washing water amount; a timing control mechanism for stopping the lowering of the drain valve while the drain valve is engaged with the drain valve, and controlling a timing at which the drain port is closed; and a valve control unit connected to the timing control unit, the timing control unit engaging with the drain valve when the first amount of washing water is selected by the washing water amount selection unit, the valve control unit causing the timing control unit to operate so as to release the engagement between the timing control unit and the drain valve when a first time elapses, the drain valve to lower when the first time elapses, the timing control unit engaging with the drain valve when a second amount of washing water is selected by the washing water amount selection unit, the valve control unit causing the timing control unit to operate so as to release the engagement between the timing control unit and the drain valve when a second time shorter than the first time elapses, the drain valve is lowered by the lapse of the second time.

According to one embodiment of the present invention thus constituted, the drain valve and the drain valve hydraulic drive unit are coupled by a clutch mechanism that is cut off at a predetermined timing, and therefore the drain valve can be moved and closed regardless of the operating speed of the drain valve hydraulic drive unit. Thus, even if there is a variation in the operating speed of the drain valve water pressure drive unit when the drain valve is lowered, the timing of closing the drain valve can be controlled without being affected by the variation. Further, the timing control means is engaged with the drain valve when the first amount of wash water is selected by the wash water amount selection unit, the valve control unit operates the timing control means to release the engagement between the timing control means and the drain valve when the first time has elapsed, the timing control means is engaged with the drain valve when the second amount of wash water is selected by the wash water amount selection unit, and the valve control unit operates the timing control means to release the engagement between the timing control means and the drain valve when the second time shorter than the first time has elapsed. In this way, when the second amount of washing water is selected by the washing water amount selection unit, the valve control unit can operate the timing control mechanism so that the timing at which the drain port is closed becomes earlier than the timing at which the first amount of washing water is selected. Therefore, according to one embodiment of the present invention, the first amount of cleaning water and the second amount of cleaning water can be set while using the clutch mechanism.

In one embodiment of the present invention, a flush tank device for supplying flush water to a flush toilet is preferably provided with: a water storage tank for storing the washing water to be supplied to the toilet bowl and having a water outlet for discharging the stored washing water to the toilet bowl; a drain valve that opens and closes the drain port, supplies the flush water to the flush toilet, and stops the supply of the flush water to the flush toilet; a drain valve hydraulic pressure drive unit that drives the drain valve by using a supply pressure of supplied tap water; a clutch mechanism that connects the drain valve to the drain valve hydraulic drive unit, lifts up the drain valve by a driving force of the drain valve hydraulic drive unit, and lowers the drain valve by being turned off; a washing water amount selection unit capable of selecting a first washing water amount for washing the toilet and a second washing water amount smaller than the first washing water amount; and a valve control unit configured to be capable of shutting off the clutch mechanism at a predetermined timing, wherein when the first washing water amount is selected by the washing water amount selection unit, the valve control unit operates to shut off the clutch mechanism when a first time elapses, and lowers the drain valve when the first time elapses, and wherein when the second washing water amount is selected by the washing water amount selection unit, the valve control unit operates to shut off the clutch mechanism when a second time shorter than the first time elapses, and lowers the drain valve when the second time elapses.

According to one embodiment of the present invention thus constituted, the drain valve and the drain valve hydraulic drive unit are coupled by a clutch mechanism that is cut off at a predetermined timing, and therefore the drain valve can be moved and closed regardless of the operating speed of the drain valve hydraulic drive unit. Further, when the first amount of wash water is selected by the wash water amount selection unit, the valve control unit operates to shut off the clutch mechanism when a first time elapses, and lowers the drain valve when the first time elapses, and when the second amount of wash water is selected by the wash water amount selection unit, the valve control unit operates to shut off the clutch mechanism when a second time shorter than the first time elapses, and lowers the drain valve when the second time elapses. In this way, when the second amount of wash water is selected by the wash water amount selection unit, the valve control unit can block the clutch mechanism at a timing when the drain port is closed earlier than when the first amount of wash water is selected. Therefore, according to an embodiment of the present invention, the first amount of cleaning water and the second amount of cleaning water can be set by lowering the drain valve for a predetermined time while using the clutch mechanism.

In one embodiment of the present invention, it is preferable that the display device further includes: a control valve provided in a flow path for supplying washing water to the valve control unit, and controlling the supply of washing water to the valve control unit; and a control unit for controlling the control valve, wherein the control valve is configured to be operated by the supplied washing water.

According to one embodiment of the present invention configured as described above, the control unit controls the control valve, and the valve control unit is operated by the washing water supplied from the control valve. Thus, the first and second amounts of wash water can be set by lowering the drain valve for a predetermined time using the clutch mechanism with a relatively compact and simple configuration.

In one embodiment of the present invention, it is preferable that the supply of the washing water from the control valve to the valve control unit is started after the drain valve hydraulic pressure driving unit raises the drain valve.

According to the embodiment of the present invention thus constituted, the first amount of cleaning water and the second amount of cleaning water can be set by lowering the drain valve with the elapse of a predetermined time using the clutch mechanism, with a relatively compact and simple configuration, so as not to hinder the operation of the drain valve for raising the drain valve with cleaning water by the drain valve hydraulic pressure drive unit.

In one embodiment of the present invention, it is preferable that the control valve further controls supply of the washing water to the drain valve hydraulic pressure driving unit.

According to the embodiment of the present invention thus constituted, the control valve is provided to control the supply of the washing water to the drain valve hydraulic drive unit, so that the first and second amounts of washing water can be set by lowering the drain valve with the elapse of the predetermined time using the clutch mechanism with a relatively compact and simple configuration.

In one embodiment of the present invention, it is preferable that the control valve supplies washing water to the valve control unit via the drain valve hydraulic pressure driving unit.

According to the embodiment of the present invention thus constituted, it is possible to suppress the generation of relatively wasteful washing water that does not contribute to the operation of either the drain valve water pressure driving portion or the valve control portion in the washing water supplied from the control valve, and it is possible to effectively use the washing water in the drain valve water pressure driving portion and the valve control portion, with a relatively compact and simple configuration.

In one embodiment of the present invention, it is preferable that the valve control unit includes: a water storage unit for storing washing water, wherein a discharge hole for discharging the stored washing water is formed at a lower portion of the water storage unit; a discharging unit for discharging the washing water to the water storage unit; and a float provided in the water storage unit and moving up and down according to a water level in the water storage unit, wherein the timing control mechanism includes an engagement portion engageable with the drain valve according to a position of the float, and when the float is raised due to accumulation of wash water in the water storage unit, the timing control mechanism arranges the engagement portion at a position engageable with the drain valve, and when the float is lowered, the timing control mechanism moves the engagement portion to a position where the engagement with the drain valve is released.

According to an embodiment of the present invention configured as described above, when the float is raised due to accumulation of wash water in the water accumulating portion, the timing control mechanism arranges the engagement portion at a position where the engagement portion can be engaged with the drain valve, and when the float is lowered, the timing control mechanism moves the engagement portion to a position where the engagement with the drain valve is released. By using the water storage unit and the float provided in the water storage unit in this manner, it is possible to suppress the influence of variations in the flow rate of the washing water supplied to the water storage unit, and to realize a relatively stable operation of the timing control mechanism with a relatively simple configuration. Therefore, according to the embodiment of the present invention, the first amount of washing water and the second amount of washing water can be set relatively stably while using the clutch mechanism.

In one embodiment of the present invention, it is preferable that the supply of the washing water from the control valve to the valve control unit is started after the clutch mechanism is turned off.

In one embodiment of the present invention, it is preferable that the drain valve hydraulic drive unit is disposed so as to be separated from the drain valve housing on the outside of the drain valve housing, the drain valve is disposed inside the drain valve housing, and the clutch mechanism is disposed on the side of the drain valve hydraulic drive unit from the drain valve hydraulic drive unit to the drain valve housing.

According to one embodiment of the present invention thus constituted, the drain valve hydraulic drive unit is disposed so as to be separated from the drain valve casing on the outside of the drain valve casing, the drain valve is disposed inside the drain valve casing, and the clutch mechanism is disposed on the side of the drain valve hydraulic drive unit from the drain valve hydraulic drive unit to the drain valve casing. Thus, the clutch mechanism can be disposed between the drain valve casing and the drain valve hydraulic drive unit on the side of the drain valve hydraulic drive unit, and the degree of freedom in setting the position at which the clutch mechanism is disengaged and the degree of freedom in the position at which the clutch mechanism is disposed can be improved.

In one aspect of the present invention, the valve control unit includes: a discharge unit configured to discharge the supplied washing water when the second washing water amount is selected by the washing water amount selection unit; a water storage unit for storing the washing water discharged from the discharge unit; and a float provided in the water reservoir and moving up and down according to a water level in the water reservoir, wherein the timing control mechanism is connected to the float and operates according to the up and down movement of the float, and controls a timing of lowering the drain valve so that a timing at which the drain port is closed when the second amount of washing water is selected is earlier than a timing at which the first amount of washing water is selected.

According to one embodiment of the present invention thus constituted, the drain valve and the drain valve hydraulic drive unit are coupled by a clutch mechanism that is cut off at a predetermined timing, and therefore the drain valve can be moved and closed regardless of the operating speed of the drain valve hydraulic drive unit. Thus, even if there is a variation in the operating speed of the drain valve water pressure drive unit when the drain valve is lowered, the timing of closing the drain valve can be controlled without being affected by the variation. When the second amount of washing water is selected by the washing water amount selection unit, the washing water is supplied from the discharge unit into the water storage unit, and the timing control mechanism operates in accordance with the vertical movement of the float. The timing control means lowers the drain valve so that the timing at which the drain port is closed when the second amount of washing water is selected is earlier than when the first amount of washing water is selected. Thus, the first and second amounts of washing water can be set while using the clutch mechanism.

In one embodiment of the present invention, it is preferable that the drain valve hydraulic pressure driving unit includes: a cylinder into which the supplied washing water flows; a piston slidably disposed in the cylinder and driven by the pressure of the washing water flowing into the cylinder; and a rod connected to the piston and driving the drain valve, wherein a volume of wash water that can be accumulated between the water accumulation unit and the float in the water accumulation unit is smaller than a volume of the cylinder.

According to the embodiment of the present invention configured as described above, the float is moved up and down by accumulating the amount of the washing water smaller than the amount of the washing water for driving the piston of the water pressure driving portion of the drain valve between the water accumulating portion and the float, and the timing control mechanism can be operated earlier by the relatively small amount of the washing water.

In one embodiment of the present invention, it is preferable that the discharge portion forms a downward discharge port.

According to the embodiment of the present invention configured as above, since the discharge portion is formed as the downward discharge port, the discharge portion can easily supply the washing water to the lower portion between the water storage portion and the float, and the timing control mechanism can be operated by moving the float up and down at an early stage by a relatively small amount of washing water.

In one embodiment of the present invention, at least a part of the water storage unit is preferably located below a water stop level of the water storage tank.

According to the embodiment of the present invention thus constituted, at least a part of the water storage unit is located below the water stop level of the water storage tank, so that buoyancy by the washing water below the water stop level in the water storage tank can be generated at the float in a state where the washing water is stored in the water storage tank to the water stop level, and the timing control mechanism can be operated by supplying a smaller amount of washing water to the water storage unit.

In one embodiment of the present invention, it is preferable that the water storage unit has a discharge hole for discharging the stored washing water.

According to the embodiment of the present invention configured as described above, since the drain hole for draining the stored washing water is formed in the water storage portion, the water storage portion can store both the washing water and the washing water by a relatively simple configuration.

In one embodiment of the present invention, it is preferable that the discharge hole of the water storage unit is formed in a lower portion of a side wall of the water storage unit, and an opening facing the opposite side to the water discharge valve in a plan view is formed.

According to the embodiment of the present invention thus constituted, it is possible to suppress the flow of the washing water discharged from the discharge hole from acting on the equipment provided on the drain valve side, for example, the equipment such as the timing control mechanism, and causing malfunction of the equipment.

In one embodiment of the present invention, it is preferable that an instantaneous flow rate of the washing water discharged from the discharge hole is smaller than an instantaneous flow rate of the washing water discharged from the discharge portion.

According to the embodiment of the present invention thus constituted, the instantaneous flow rate of the washing water discharged from the discharge hole is smaller than the instantaneous flow rate of the washing water discharged from the discharge portion, so that the washing water can be efficiently stored in the water storage portion, and the timing control mechanism can be operated by supplying a smaller amount of washing water to the water storage portion.

In addition, a toilet apparatus according to an embodiment of the present invention includes: the invention relates to a washing water tank device; and a flush toilet that is flushed by the flush water supplied from the flush water tank device.

Effects of the invention

According to the present invention, it is possible to provide a flush tank device capable of precisely setting the amount of flush water to be discharged while opening the drain valve by the drain valve hydraulic pressure drive unit, and a flush toilet apparatus including the flush tank device.

Drawings

Fig. 1 is a perspective view showing the entire toilet bowl apparatus including a flush water tank apparatus according to a first embodiment of the present invention.

Fig. 2 is a sectional view showing a schematic configuration of a washing water tank device according to a first embodiment of the present invention.

Fig. 3 is a diagram schematically showing the configuration and operation of a clutch mechanism provided in a flush water tank device according to a first embodiment of the present invention.

Fig. 4 is an enlarged view of a part of a drain valve, a water storage unit, and the like provided in the washing water tank device according to the first embodiment of the present invention.

Fig. 5 is a diagram showing an operation in a large washing mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 6 is a diagram showing an operation in a large washing mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 7 is a diagram showing an operation in a large washing mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 8 is a diagram showing an operation in a large washing mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 9 is a diagram showing an operation in a large washing mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 10 is a diagram showing an operation in a large washing mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 11 is a diagram showing an operation in a small wash mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 12 is a diagram showing an operation in a small wash mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 13 is a diagram showing an operation in a small wash mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 14 is a diagram showing an operation in a small wash mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 15 is a diagram showing an operation in a small wash mode of the wash water tank device according to the first embodiment of the present invention.

Fig. 16 is a sectional view showing a schematic configuration of a washing water tank device according to a second embodiment of the present invention.

Fig. 17 is a diagram showing an operation in a large cleaning mode of the cleaning water tank device according to the second embodiment of the present invention.

Fig. 18 is a diagram showing an operation in a large cleaning mode of the cleaning water tank device according to the second embodiment of the present invention.

Fig. 19 is a diagram showing an operation in a large cleaning mode of the cleaning water tank device according to the second embodiment of the present invention.

Fig. 20 is a diagram showing an operation in a large cleaning mode of the cleaning water tank device according to the second embodiment of the present invention.

Fig. 21 is a diagram showing an operation in a large cleaning mode of the cleaning water tank device according to the second embodiment of the present invention.

Fig. 22 is a diagram showing an operation in a large cleaning mode of the cleaning water tank device according to the second embodiment of the present invention.

Fig. 23 is a diagram showing an operation in a small wash mode of the wash water tank device according to the second embodiment of the present invention.

Fig. 24 is a diagram showing an operation in a small wash mode of the wash water tank device according to the second embodiment of the present invention.

Fig. 25 is a sectional view showing a schematic configuration of a washing water tank device according to a third embodiment of the present invention.

Detailed Description

Next, a toilet apparatus according to a first embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing the entire toilet bowl apparatus including a flush water tank apparatus according to a first embodiment of the present invention. Fig. 2 is a sectional view showing a schematic configuration of a washing water tank device according to a first embodiment of the present invention.

As shown in fig. 1, a toilet bowl apparatus 1 according to a first embodiment of the present invention is configured with a toilet bowl main body 2 as a toilet bowl and a flush water tank apparatus 4 according to the first embodiment of the present invention placed on a rear portion of the toilet bowl main body 2. The water flush toilet main body 2 is flushed with flush water supplied from the flush water tank device 4. The toilet apparatus 1 according to the present embodiment is configured to: after use, the remote control device 6 attached to the wall surface is operated, or after the motion sensor 8 provided in the toilet seat senses the user's absence, a predetermined time elapses, whereby the bowl portion 2a of the toilet main body 2 is washed. The cleaning water tank device 4 of the present embodiment is configured to: the washing water stored inside is discharged to the toilet main body 2 based on an instruction signal from the remote control device 6 or the human body sensor 8, and the bowl portion 2a is washed with the washing water.

Further, the "large wash" or the "small wash" for washing the bowl portion 2a is performed by the user pressing the button 6a of the remote control device 6. Therefore, in the present embodiment, the remote control device 6 functions as a washing water amount selecting unit that can select a first washing water amount for washing the toilet main body 2 and a second washing water amount smaller than the first washing water amount. As a modification, the remote control unit 6 may be a washing water amount selecting unit that can change the washing water amount to another predetermined setting, or may be a washing water amount selecting unit that can arbitrarily change the washing water amount. In the present embodiment, the motion sensor 8 is provided in the toilet seat, but the present invention is not limited to this configuration, and may be provided in a position where the motion of the user, such as sitting, leaving, approaching, departing, or stretching, can be sensed, and may be provided in the toilet main body 2 or the flush tank device 4, for example. The motion of the user, such as sitting, approaching, separating, or stretching, may be sensed by the motion sensor 8, and an infrared sensor or a microwave sensor may be used as the motion sensor 8. The remote control device 6 may be changed to an operation lever device or an operation button device having a structure capable of mechanically controlling opening and closing of the first control valve 16 and the second control valve 22, which will be described later.

As shown in fig. 2, the washing water tank device 4 includes: a water storage tank 10 for storing the washing water to be supplied to the toilet main body 2; a drain valve 12 for opening and closing a drain port 10a provided in the water storage tank 10; and a drain valve hydraulic pressure drive unit 14 that drives the drain valve 12. The cleaning water tank device 4 includes therein: a first control valve 16 for controlling the supply of water to the drain valve hydraulic drive unit 14; and a solenoid valve 18 fitted to the first control valve 16. The cleaning water tank device 4 includes, inside the water storage tank 10: a second control valve 22 for supplying washing water to the water reservoir 10; and a solenoid valve 24 fitted to the second control valve 22. The flush water tank apparatus 4 further includes a clutch mechanism 30, and the clutch mechanism 30 connects the discharge valve 12 to the discharge valve hydraulic drive unit 14, and lifts up the discharge valve 12 by the driving force of the discharge valve hydraulic drive unit 14. A case 13 is formed above the water discharge valve 12, and the case 13 is formed in a cylindrical shape with a lower side opened. The case 13 is connected and fixed to the drain valve hydraulic driving part 14 and the discharge part 54.

The water storage tank 10 is a tank configured to store the washing water to be supplied to the toilet main body 2, and has a bottom portion formed with a drain port 10a for discharging the stored washing water to the toilet main body 2. An overflow pipe 10b is connected to the downstream side of the drain port 10a in the water tank 10. The overflow pipe 10b is vertically erected from the vicinity of the drain port 10a and extends to a position above the full water level WL of the washing water stored in the water tank 10. Therefore, the washing water flowing in from the upper end of the overflow pipe 10b bypasses the drain opening 10a and directly flows out to the toilet main body 2.

The drain valve 12 is a valve body arranged to open and close the drain port 10a, and when the drain valve 12 is lifted up and opened, the washing water in the water tank 10 is discharged to the toilet main body 2 to wash the bowl portion 2 a. The drain valve 12 supplies the washing water to the toilet main body 2 and stops the supply of the washing water to the toilet main body 2. Further, when the drain valve 12 is lifted up by the driving force of the drain valve hydraulic driving unit 14 and lifted up to a predetermined height, the clutch mechanism 30 is disengaged, and the drain valve 12 is lowered by its own weight. When the water discharge valve 12 is lowered, the water discharge valve 12 is held by a holding mechanism 46, which will be described later, for a predetermined time, and the time until the water discharge valve 12 is seated on the water discharge port 10a is adjusted.

The drain valve hydraulic pressure drive unit 14 is configured to drive the drain valve 12 by the supply water pressure of tap water (cleaning water) supplied from a tap water line. Specifically, the drain valve hydraulic pressure drive unit 14 includes: a cylinder 14a into which washing water supplied from the first control valve 16 flows; a piston 14b slidably disposed in the cylinder 14 a; and a rod 32 that protrudes from the lower end of the cylinder 14a and drives the discharge valve 12.

A spring 14c is disposed inside the cylinder 14a to bias the piston 14b downward. Further, a seal 14e is fitted to the piston 14b, and water tightness between the inner wall surface of the cylinder 14a and the piston 14b is ensured. A clutch mechanism 30 is provided at the lower end of the lever 32, and the lever 32 and the valve shaft 12a of the water discharge valve 12 are coupled and the coupling of the lever 32 and the valve shaft 12a of the water discharge valve 12 is released by the clutch mechanism 30.

The cylinder 14a is a cylindrical member, the axis of which is arranged in the vertical direction, and the piston 14b is slidably accommodated inside. A drive unit water supply passage 34a is connected to a lower end of the cylinder 14a, and the washing water flowing out of the first control valve 16 flows into the cylinder 14 a. Therefore, the piston 14b in the cylinder 14a is pushed up against the urging force of the spring 14c by the washing water flowing into the cylinder 14 a.

On the other hand, an outflow hole is provided in an upper portion of the cylinder 14a, and the drive portion drain passage 34b communicates with the inside of the cylinder 14a via the outflow hole. Therefore, when wash water flows into the cylinder 14a from the drive unit water supply passage 34a connected to the lower portion of the cylinder 14a, the piston 14b is pushed up from the lower portion of the cylinder 14a as the first position. The piston 14b is driven by the pressure of the washing water flowing into the cylinder. When the piston 14b is pushed up to a second position above the outlet hole, the water flowing into the cylinder 14a flows out from the outlet hole through the drive section drain passage 34 b. That is, when the piston 14b moves to the second position, the drive unit water supply passage 34a and the drive unit water discharge passage 34b communicate with each other via the inside of the cylinder 14 a. A discharge portion 54 is formed at the distal end portion of the drive portion drain passage 34b extending from the cylinder 14 a. In this way, the driving-unit water discharge passage 34b forms a flow path extending to the discharge unit 54.

The rod 32 is a rod-shaped member connected to the lower surface of the piston 14b, and extends through a through hole 14f formed in the bottom surface of the cylinder 14a so as to protrude downward from the cylinder 14 a. The rod 32 is connected to the piston 14b to drive the drain valve 12. Further, a gap 14d is provided between the rod 32 protruding from the lower side of the cylinder 14a and the inner wall of the through hole 14f of the cylinder 14a, and a part of the washing water flowing into the cylinder 14a flows out from the gap 14 d. The water flowing out of the gap 14d flows into the reservoir 10. Since the gap 14d is relatively narrow and the flow path resistance is large, even in a state where water flows out from the gap 14d, the pressure in the cylinder 14a rises due to the washing water flowing into the cylinder 14a from the drive unit water supply path 34a, and the piston 14b is pushed up against the biasing force of the spring 14 c.

Next, the first control valve 16 is configured to control the supply of the washing water to the drain valve hydraulic pressure driving unit 14 based on the operation of the electromagnetic valve 18, and to control the supply of the water to the drain unit 54 and the stop of the supply of the water to the drain unit 54. Therefore, the first control valve 16 is provided in a flow path for supplying washing water to the discharge unit 54 or the like as a valve control unit described later, and controls the supply of washing water to the discharge unit 54 or the like as a valve control unit. Therefore, the first control valve 16 supplies the washing water to the discharge portion 54 or the like as the valve control portion via the drain valve hydraulic pressure driving portion 14.

The first control valve 16 includes: a main valve body 16 a; a main valve port 16b opened and closed by the main valve body 16 a; a pressure chamber 16c for moving the main valve body 16 a; and a pilot valve 16d that switches the pressure in the pressure chamber 16 c.

The main valve body 16a is configured to open and close a main valve port 16b of the first control valve 16, and when the main valve port 16b is opened, the tap water supplied from the water supply pipe 38 flows into the drain valve hydraulic pressure driving unit 14. The pressure chamber 16c is provided in the housing of the first control valve 16 adjacent to the main valve body 16 a. A part of the tap water supplied from the water supply pipe 38 flows into the pressure chamber 16c, and the internal pressure thereof is increased. When the pressure in the pressure chamber 16c rises, the main valve body 16a moves toward the main valve port 16b, and the main valve port 16b closes.

The pilot valve 16d is configured to open and close a pilot valve port (not shown) provided in the pressure chamber 16 c. When a pilot valve opens a pilot valve port (not shown), water in the pressure chamber 16c flows out and the internal pressure decreases. When the pressure in the pressure chamber 16c decreases, the main valve body 16a is unseated from the main valve port 16b, and the first control valve 16 opens. When the pilot valve 16d closes, the pressure in the pressure chamber 16c rises, and the first control valve 16 closes.

The pilot valve 16d is moved by a solenoid valve 18 attached to the pilot valve 16d, and opens and closes a pilot valve port (not shown). The solenoid valve 18 is electrically connected to the controller 40, and moves the pilot valve 16d based on a command signal from the controller 40. Specifically, the controller 40 as a control unit receives signals from the remote control device 6 and the human body sensor 8, and the controller 40 transmits an electric signal to the electromagnetic valve 18 to operate the same. In this manner, the first control valve 16 is controlled by the controller 40.

A vacuum control valve 36 is provided in the drive unit water supply path 34a between the first control valve 16 and the drain valve water pressure drive unit 14. The vacuum regulator valve 36 prevents the backflow of water toward the first control valve 16 when the negative pressure is generated on the first control valve 16 side.

The second control valve 22 is configured to control the supply of water to the reservoir 10 and the stop of the supply of water to the reservoir 10 based on the operation of the electromagnetic valve 24. The second control valve 22 is connected to the water supply pipe 38 via the first control valve 16, but tap water supplied from the water supply pipe 38 always flows into the second control valve 22 regardless of the opening and closing of the first control valve 16. The second control valve 22 includes a main valve body 22a, a pressure chamber 22b, and a pilot valve 22c, and the pilot valve 22c is opened and closed by an electromagnetic valve 24. When the pilot valve 22c is opened by the solenoid valve 24, the main valve body 22a of the second control valve 22 is opened, and the tap water flowing from the water supply pipe 38 is supplied to the water storage tank 10 or the overflow pipe 10 b. The solenoid valve 24 is electrically connected to the controller 40, and moves the pilot valve 22c based on a command signal from the controller 40. Specifically, the controller 40 operates the solenoid valve 24 by sending an electric signal to the solenoid valve based on the operation of the remote control device 6. In this manner, the second control valve 22 is controlled by the controller 40. Note that the electromagnetic valve 24 may be omitted, and when the electromagnetic valve 24 is omitted, the pilot valve 22c is controlled by the float switch 42 as described later.

On the other hand, a float switch 42 is connected to the pilot valve 22 c. The float switch 42 is configured to control the pilot valve 22c based on the water level in the reservoir tank 10, and open and close a pilot valve port (not shown). That is, when the water level in the reservoir tank 10 reaches a predetermined water level, the float switch 42 sends a signal to the pilot valve 22c to close the pilot valve port (not shown). That is, the float switch 42 is configured to set the stored water level in the reservoir tank 10 to a predetermined full water level WL as the water stop level. The float switch 42 is disposed in the reservoir 10 and configured to stop the supply of water from the first control valve 16 to the drain valve hydraulic drive unit 14 when the water level of the reservoir 10 rises to the full water level WL. The float switch 42 may be modified to a ball cock (ball tap) mechanism. The ball cock mechanism includes: a float for the ball cock, which moves up and down according to the water level; and a support arm connected to the float for the ball cock and acting on the pilot valve 22 c. Thus, when the water level of the reservoir tank 10 rises to the full water level WL, the ball cock float rises, and the support arm connected to the ball cock float rotates upward, so that the ball cock mechanism mechanically closes the pilot valve port of the pilot valve 22 c. When the water level of the water tank 10 drops below the full water level WL, the ball cock float drops, the support arm connected to the ball cock float rotates downward, and the ball cock mechanism mechanically opens the pilot valve port of the pilot valve 22 c.

Further, a water supply path branch portion 50a is provided in the water supply path 50 extending from the second control valve 22. One of the water supply paths 50 branched at the water supply path branching portion 50a is configured to allow water to flow into the water storage tank 10, and the other is configured to allow water to flow into the overflow pipe 10 b. Therefore, a part of the flush water supplied from the second control valve 22 is discharged to the flush toilet main body 2 through the overflow pipe 10b, and the remaining part is stored in the water tank 10.

Further, a vacuum control valve 44 is provided in the water supply path 50. When the second control valve 22 side becomes negative pressure, the vacuum regulator valve 44 prevents the water from flowing backward to the second control valve 22 side.

The water supplied from the water supply line is supplied to the first control valve 16 and the second control valve 22 via a water stop plug 38a disposed outside the water storage tank 10 and a constant flow valve 38b disposed in the water storage tank 10 on the downstream side of the water stop plug 38 a. The water stop plug 38a is provided to stop the supply of water to the wash tank device 4 at the time of maintenance or the like, and is normally used in a state where the plug is opened. The constant flow valve 38b is provided to allow water supplied from the water supply line to flow into the first control valve 16 and the second control valve 22 at a predetermined flow rate, and is configured to supply water at a constant flow rate regardless of the installation environment of the water flush toilet apparatus 1.

The controller 40 incorporates a CPU, a memory, and the like, and controls connected devices so as to execute a large cleaning mode and a small cleaning mode, which will be described later, based on a predetermined control program recorded in the memory or the like. The controller 40 is electrically connected to the remote control device 6, the human body sensor 8, the solenoid valve 18, the solenoid valve 24, and the like.

Next, the structure and operation of the clutch mechanism 30 will be described with reference to fig. 3.

Fig. 3 schematically shows the configuration of the clutch mechanism 30, and shows the operation when lifted up by the drain valve hydraulic drive portion 14.

First, as shown in the column (a) of fig. 3, the clutch mechanism 30 is provided at the lower end of the rod 32 extending downward from the discharge valve hydraulic drive unit 14, and is configured to connect the lower end of the rod 32 to the upper end of the valve shaft 12a of the discharge valve 12 and to release the connection between the lower end of the rod 32 and the upper end of the valve shaft 12a of the discharge valve 12. The clutch mechanism 30 includes: a rotating shaft 30a fitted to a lower end of the rod 32; a hook member 30b supported by the rotation shaft 30 a; and an engaging claw 30c provided at an upper end of the valve shaft 12 a. With such a configuration, the clutch mechanism 30 is cut off at a predetermined timing and at a predetermined lift height, and the drain valve 12 is lowered.

The rotating shaft 30a is fitted to a lower end of the lever 32 so as to be oriented in the horizontal direction, and rotatably supports the hook member 30 b. The hook member 30b is a plate-like member, and an intermediate portion thereof is rotatably supported by the rotating shaft 30 a. Further, the lower end of the hook member 30b is bent into a hook shape, and a hook portion is formed. The engaging claw 30c provided at the upper end of the valve shaft 12a of the water discharge valve 12 is a right-angled triangular claw. The bottom side of the engaging claw 30c is formed to be substantially horizontal, and the side surface is formed to be inclined downward.

In the state shown in the column (a) of fig. 3, the water discharge valve 12 is seated on the water discharge opening 10a, and the water discharge opening 10a is closed. In this state, the drain valve water pressure driving unit 14 and the drain valve 12 are coupled, and in this coupled state, the hook portion of the hook member 30b engages with the bottom edge of the engagement claw 30c, and the drain valve 12 can be lifted up by the lever 32.

Next, as shown in fig. 3 (b), when the washing water is supplied to the discharge valve hydraulic pressure driving unit 14, the piston 14b moves upward, and the discharge valve 12 is lifted up by the rod 32. As shown in the column (c) of fig. 3, when the drain valve 12 is lifted up to the predetermined position, the upper end of the hook member 30b abuts against the bottom surface of the drain valve hydraulic drive unit 14, and the hook member 30b pivots about the rotary shaft 30 a. By this rotation, the hook portion at the lower end of the hook member 30b moves in a direction to be disengaged from the engagement claw 30c, and the engagement between the hook member 30b and the engagement claw 30c is released. When the engagement between the hook member 30b and the engagement claw 30c is released, the drain valve 12 is lowered toward the drain port 10a in the wash water stored in the reservoir 10, as shown in the column (d) of fig. 3. (As will be described later, the descending drain valve 12 is temporarily held at a predetermined height by the holding mechanism 46 before being seated in the drain port 10 a.)

As shown in fig. 3 (e), when the supply of the washing water to the drain valve hydraulic pressure driving unit 14 is stopped, the lever 32 is lowered by the biasing force of the spring 14 c. When the lever 32 is lowered, as shown in the column (f) of fig. 3, the tip of the hook portion of the hook member 30b attached to the lower end of the lever 32 abuts on the engagement claw 30 c. When the lever 32 further descends, as shown in the column (g) of fig. 3, the hook portion of the hook member 30b is pressed by the inclined surface of the engagement claw 30c, and the hook member 30b rotates. When the lever 32 further descends, as shown in the column (h) of fig. 3, the hook portion of the hook member 30b passes over the engagement claw 30c, the hook member 30b rotates to the original position by gravity, the engagement claw 30c is engaged with the hook portion of the hook member 30b again, and the state shown in the column (a) of fig. 3 is restored.

Referring back to fig. 2 and 4 again, the water reservoir portion and the like of the cleaning water tank device 4 will be described.

Fig. 4 is an enlarged view of a part of the drain valve 12, the water accumulation portion 56, the float 26, and the holding mechanism 46 in fig. 2. The column (a) of fig. 4 shows a state in which the drain valve 12 is closed, and the column (b) of fig. 4 shows a state in which the drain valve 12 is opened and held by the holding mechanism 46.

As shown in fig. 2, the cleaning water tank device 4 further includes: a discharge unit 54 for discharging the supplied washing water; a water reservoir 56 for storing the washing water discharged from the discharge unit 54; a float 26 provided in the water reservoir 56 and moving up and down according to the water level in the water reservoir 56; a transmission unit 48 connected to the float 26; and a holding mechanism 46 as a timing control mechanism that moves between a holding state in which the lowering of the discharge valve 12 is restricted and a non-holding state in which the lowering of the discharge valve 12 is not restricted (in a state in which the engagement with the holding claws 12b of the discharge valve 12 is released) in conjunction with the movement of the transmission portion 48. As a modification, the wash water tank device 4 may be further provided with: a discharge portion 54; a water accumulation portion 56; a float 26; and a timing control mechanism coupled to the float 26, operating in accordance with the vertical movement of the float 26, for controlling the timing of lowering the drain valve 12 so that the timing at which the drain port 10a is closed when the second amount of wash water is selected is earlier than the timing at which the first amount of wash water is selected. Such a timing control mechanism may be provided with: a transmission unit 48 connected to the float 26; and a holding mechanism 46 that moves between a holding state in which the lowering of the discharge valve 12 is restricted and a non-holding state in which the lowering of the discharge valve 12 is not restricted (in a state in which the engagement with the holding claws 12b of the discharge valve 12 is released) in conjunction with the movement of the transmission portion 48.

Again in the present embodiment, the discharge portion 54, the water accumulation portion 56, the float 26, and the transmission portion 48 function as a valve control portion. The valve control unit is connected to the holding mechanism 46 and is configured to operate at a timing corresponding to the amount of washing water selected by the remote control unit 6 or the like. The cleaning water tank device 4 includes such a valve control unit. When the first amount of cleaning water is selected by the remote control device 6 or the like, the valve control unit causes the holding mechanism 46 to engage with the water discharge valve 12 for a first time, and thereafter causes the holding mechanism 46 to operate so as to release the engagement between the holding mechanism 46 and the water discharge valve 12, and the water discharge valve 12 is lowered after the first time elapses. When the second amount of cleaning water is selected by the remote control device 6 or the like, the valve control unit causes the holding mechanism 46 to engage with the water discharge valve 12 for a second time shorter than the first time, and thereafter causes the holding mechanism 46 to operate so as to release the engagement between the holding mechanism 46 and the water discharge valve 12, and the water discharge valve 12 is lowered after the second time elapses. When an arbitrary amount of washing water is selected by the remote control device 6 or the like, the valve control unit causes the holding mechanism 46 to engage with the discharge valve 12 for a predetermined time corresponding to the arbitrary amount of washing water, and thereafter causes the holding mechanism 46 to operate so as to release the engagement between the holding mechanism 46 and the discharge valve 12, and the discharge valve 12 is lowered after the predetermined time has elapsed. Thus, the amount of flush water can be relatively easily changed according to the use state of the user without being limited to the first amount of flush water (the amount of flush water for the large flush mode) and the second amount of flush water (the amount of flush water for the small flush mode), and an arbitrary amount of flush water can be supplied to the toilet main body 2. The valve control portion formed by the discharge portion 54, the water accumulation portion 56, the float 26, and the transmission portion 48 is configured to be operated by the supplied washing water.

When the second amount of washing water is selected by the remote control device 6, the drain unit 54 drains the supplied washing water. The drain 54 is configured to drain the washing water even when the first amount of washing water is selected by the remote control device 6. The discharge portion 54 is formed at the lower end of the driving portion drain passage 34b, and extends downward. The discharge portion 54 penetrates the upper surface of the housing 13 and is fixed to the upper surface of the housing 13. The discharge portion 54 forms a discharge port having a narrow tip and directed downward. Therefore, the washing water is accelerated downward by gravity, and the flow path is narrowed at the discharge port, so that the flow velocity thereof is further accelerated. The discharge portion 54 is disposed inside the side wall of the water storage portion 56 and above the full water level WL.

At least a part of the water reservoir 56 is located below the water stop level (full water level WL) of the water tank 10 in the standby state before the start of cleaning. More preferably, the water accumulation unit 56 is located below the water stop level (full water level WL) of the reservoir tank 10 in the standby state before the start of cleaning. The water reservoir 56 is formed in a hollow box shape and has an open upper surface. A part of the side wall of water accumulating portion 56 is formed by case 13, and water accumulating portion 56 is fixed to case 13. The water accumulator 56 is disposed below the discharge unit 54 and is configured to receive the washing water discharged from the discharge unit 54. Further, the water accumulation portion 56 is disposed so as to surround the outside of the float 26. The volume of the washing water that can be stored between the water storage unit 56 and the float 26 in the water storage unit 56 is smaller than the volume of the cylinder 14 a. The water accumulating portion 56 is provided with a discharge hole 56b for discharging the accumulated washing water. The discharge hole 56b is formed in a lower portion of the side wall 56c of the water accumulating portion 56, and is opened toward the opposite side to the valve shaft 12a of the water discharge valve 12 in a plan view. The discharge hole 56b forms a small hole having a relatively small diameter. Therefore, the instantaneous flow rate a1 (see fig. 7) of the washing water discharged from the discharge hole 56b to the outside of the water storage unit 56 (inside the water storage tank 10) is smaller than the instantaneous flow rate a2 (see fig. 7) of the washing water discharged from the discharge unit 54.

The float 26 is disposed within the sump portion 56. The float 26 is a hollow rectangular parallelepiped member configured to receive buoyancy from the washing water stored in the water storage unit 56. When the water level in the water accumulating portion 56 is equal to or higher than a predetermined water level (substantially the water level of the float 26), the float 26 is brought into a state shown by a solid line in the column (a) of fig. 4 by the buoyancy. The float 26 is driven based on the water level in the water reservoir portion 56, and is indirectly related to the water level in the water reservoir 10, but is directly driven independently.

The transmission portion 48 is formed as a rod-like member extending vertically downward from the lower surface of the float 26. The transmitting portion 48 is fixed to the lower surface of the float 26. The transmission portion 48 penetrates the bottom surface of the water storage portion 56 and extends below the water storage portion 56. The transmission unit 48 is not fixed to the water storage unit 56, and is disposed slidably with respect to the water storage unit 56. The lower end of the transmission portion 48 is coupled to the holding mechanism 46. Therefore, the transmission unit 48 moves up and down similarly according to the up and down movement of the float 26, and operates the holding mechanism 46.

The holding mechanism 46 is connected to the transmission portion 48, and operates in accordance with the vertical movement of the float 26 and the transmission portion 48, and controls the timing of lowering the drain valve 12 so that the timing at which the drain port 10a is closed when the second amount of cleaning water is selected is earlier than the timing at which the first amount of cleaning water is selected. Therefore, the holding mechanism 46 stops the lowering of the water discharge valve 12 while engaging with the water discharge valve 12, and controls the timing at which the water discharge port 10a is closed.

The holding mechanism 46 moves between the holding state and the non-holding state in conjunction with the movement of the transmission portion 48. The holding mechanism 46 is configured to engage with the drain valve 12 when moved to the holding state, and to hold the drain valve 12 at a predetermined height. The holding mechanism 46 is a mechanism coupled to the transmission portion 48 by a link mechanism or the like, and includes a support shaft 46a, an arm member 46b supported by the support shaft 46a, and an engaging member 46c as an engaging portion. The support shaft 46a is a rotary shaft fixed to the reservoir 10 by an arbitrary member (not shown), and rotatably supports the arm member 46b and the engagement member 46 c. On the other hand, a holding claw 12b configured to be engageable with the engaging member 46c is formed at the base end portion of the valve shaft 12a of the water discharge valve 12. The holding claw 12b is a right triangle-shaped projection, extends from the valve shaft 12a toward the engaging member 46c, and extends such that the bottom side thereof is directed horizontally and the side surface thereof is inclined downward.

The support shaft 46a is a shaft extending in a direction perpendicular to the paper surface of fig. 4, and is formed such that both end portions thereof are fixed to the water storage tank 10 by an arbitrary member (not shown), and an intermediate portion thereof is bent so as to be apart from the valve shaft 12 a. The arm member 46b is a bent beam-like member, and has two branched lower ends. The lower ends of the branched arm members 46b are rotatably supported by both end portions of the support shaft 46a, respectively. Therefore, even in the case where the water discharge valve 12 is moved in the vertical direction, the support shaft 46a and the arm member 46b do not interfere with the holding pawl 12b provided to the valve shaft 12a of the water discharge valve 12.

On the other hand, the upper end of the arm member 46b is rotatably coupled to the transmission portion 48. Therefore, in a state where the float 26 receives buoyancy, the float 26 is held in a state shown by a solid line in column (a) of fig. 4. When the water level in the water accumulation portion 56 decreases, the float 26 and the transmission portion 48 descend due to their own weight, and the arm member 46b and the engagement member 46c pivot about the support shaft 46a to a state shown by an imaginary line in the column (a) of fig. 4. The rotation of the arm member 46b and the engaging member 46c is restricted from the holding state of the holding mechanism 46 shown by the solid line in the column (a) of fig. 4 to the non-holding state shown by the imaginary line.

The engaging members 46c are rotatably attached to the support shaft 46a, and the base end portions thereof are rotatably supported at both end portions of the support shaft 46 a. The engaging member 46c is formed to be engageable with the drain valve 12 in accordance with the position of the float 26. The distal end portion of the engaging member 46c extends so as to be bent toward the valve shaft 12a of the water discharge valve 12. When the float 26 is lifted up due to the flush water stored in the water storage unit 56, the holding mechanism 46 arranges the engaging member 46c at a position where it can engage with the water discharge valve 12. Therefore, in the holding state where the valve shaft is rotated at the position indicated by the solid line in the column (a) of fig. 4, the distal end portion of the engaging member 46c interferes with the holding claw 12b provided on the valve shaft 12 a. On the other hand, when the float 26 descends, the holding mechanism 46 moves the engagement member 46c to a position at which the engagement with the water discharge valve 12 is released, as shown by the imaginary line in the column (a) of fig. 4. In the non-holding state where the engaging member is rotated at the position shown by the imaginary line in the column (a) of fig. 4, the distal end portion of the engaging member 46c does not interfere with the holding claw 12 b.

The engaging member 46c is configured to rotate about the support shaft 46a in conjunction with the arm member 46 b. That is, when the float 26, the transmitting portion 48, and the arm member 46b move from the state shown by the solid line in the column (a) of fig. 4 to the state shown by the imaginary line, the engaging member 46c also rotates to the state shown by the imaginary line in conjunction with the arm member 46 b. However, in the state shown by the solid line in the column (a) of fig. 4, when the tip end of the engaging member 46c is pushed up by the holding claw 12b of the drain valve 12, only the engaging member 46c is rotated while being rotated. That is, when the distal end portion of the engagement member 46c is pushed up by the holding claw 12b, only the engagement member 46c can be rotated to the position shown by the imaginary line in fig. 4 in a state where the float 26, the transmission portion 48, and the arm member 46b are held at the position shown by the solid line.

On the other hand, as shown by the solid line in the column (b) of fig. 4, in a state where the drain valve 12 is lifted up and the holding claw 12b is positioned above the engaging member 46c, the holding claw 12b engages with the engaging member 46c, and the lowering of the drain valve 12 is prevented. That is, the engaging member 46c constituting the holding mechanism 46 engages with the water discharge valve 12 to hold the water discharge valve 12 at a predetermined height. Therefore, the drain valve 12 is lifted by the lever 32 (fig. 3) connected to the drain valve hydraulic driving part 14, and then, when the clutch mechanism 30 is disengaged, the drain valve 12 is lowered. In the middle of this lowering, the holding claws 12b of the discharge valve 12 engage with the engaging members 46c of the holding mechanism 46, and the discharge valve 12 is held at a predetermined height.

When the water level in the water accumulating portion 56 decreases, the position of the float 26 lowers, and the float 26, the transmission portion 48, and the arm member 46b move to the positions shown by the imaginary lines in the column (b) of fig. 4. In conjunction with this movement, the engagement member 46c also rotates to the position shown by the imaginary line in the column (b) of fig. 4, and therefore, the engagement between the holding claw 12b and the engagement member 46c is released. Thereby, the water discharge valve 12 is lowered and seated on the water discharge port 10a, and the water discharge port 10a is closed.

Next, the operation of the flush water tank device 4 according to the first embodiment of the present invention and the water closet device 1 including the flush water tank device 4 will be described with reference to fig. 2 and 5 to 10.

First, in the standby state of toilet cleaning shown in fig. 2, the water level in the reservoir tank 10 is at the predetermined full water level WL, and in this state, both the first control valve 16 and the second control valve 22 are closed. The holding mechanism 46 is set to a holding state shown by a solid line in the column (a) of fig. 4. In the standby state before the flush water is discharged from the discharge unit 54, flush water is accumulated in the water accumulating unit 56, the float 26 of the water accumulating unit 56 rises by receiving the buoyancy of the flush water, the transmission unit 48 connected to the float 26 rises, and the holding mechanism 46 is held. Next, when the user presses the large washing button of the remote control 6 (fig. 1), the remote control 6 transmits an instruction signal for executing the large washing mode to the controller 40 (fig. 2). Further, when the small wash button is pressed, an instruction signal for executing the small wash mode is transmitted to the controller 40. In this way, in the present embodiment, the toilet apparatus 1 includes two wash modes, i.e., a large wash mode and a small wash mode, which are different in the amount of wash water, and the remote control device 6 functions as a wash water amount selector that selects the amount of wash water.

In the toilet water device 1 of the present embodiment, even when the human body sensor 8 (fig. 1) senses the absence of the seat of the user and the washing button of the remote control device 6 is not pressed and a predetermined time has elapsed, a toilet washing instruction signal is transmitted to the controller 40. When the time from when the user sits on the toilet apparatus 1 to when the user leaves the toilet is shorter than the predetermined time, the controller 40 determines that the user urinates and executes the small flush mode. On the other hand, when the time from seating to unseating is equal to or longer than the predetermined time, the controller 40 executes the large washing mode. Therefore, in this case, the controller 40 selects a large washing mode in which washing is performed with a first amount of washing water and a small washing mode in which washing is performed with a second amount of washing water smaller than the first amount of washing water, and thus the controller 40 functions as a washing water amount selecting unit.

Next, the operation of the large cleaning mode will be described with reference to fig. 2 and 5 to 10.

Upon receiving the instruction signal to perform the large purge, the controller 40 operates the solenoid valve 18 (fig. 2) included in the first control valve 16 to unseat the pilot valve 16d on the solenoid valve side from the pilot valve port. This reduces the pressure in the pressure chamber 16c, and the main valve body 16a is unseated from the main valve port 16b and the main valve port 16b is opened. When the first control valve 16 is opened, as shown in fig. 5, the washing water flowing from the water supply pipe 38 is supplied to the drain valve hydraulic pressure driving part 14 via the first control valve 16. Thereby, the piston 14b of the discharge valve hydraulic drive unit 14 is pushed up, the discharge valve 12 is lifted up via the rod 32, and the flush water in the reservoir tank 10 is discharged from the discharge port 10a to the toilet main body 2. At this time, the pilot valve 16d is still in the open state, and the washing water flowing from the water supply pipe 38 is continuously supplied to the drain valve hydraulic drive unit 14 via the first control valve 16. The piston 14b is raised to the second position, and the drive unit water supply passage 34a and the drive unit water discharge passage 34b communicate with each other through the inside of the cylinder 14a, so that the washing water is discharged from the discharge unit 54 to the water accumulating unit 56. Therefore, after the drain valve hydraulic pressure driving unit 14 raises the drain valve 12, the supply of the washing water from the first control valve 16 to the water storage unit 56 is started. As described later, since the clutch mechanism 30 is shut off by the rise of the drain valve 12, the supply of the washing water from the first control valve 16 to the water storage unit 56 or the like as the valve control unit is started after the clutch mechanism 30 is shut off.

When the water discharge valve 12 is lifted, the holding claws 12b provided on the valve shaft 12a of the water discharge valve 12 push up and rotate the engaging members 46c of the holding mechanism 46, and the holding claws 12b get over the engaging members 46c (column (a) → (b) of fig. 4).

Next, as shown in fig. 6, when the drain valve 12 is further lifted, the clutch mechanism 30 is turned off. That is, when the drain valve 12 reaches a predetermined height, the upper end of the hook member 30b of the clutch mechanism 30 abuts against the bottom surface of the drain valve hydraulic drive unit 14, and the clutch mechanism 30 is disconnected (column (b) → (c) of fig. 3).

When the clutch mechanism 30 is turned off, the drain valve 12 starts to descend toward the drain port 10a by its own weight. Immediately after the discharge valve 12 is opened, the water level in the water accumulating portion 56 is high, and therefore the float 26 is at the position floating by the buoyancy, the transmission portion 48 is in the raised state, and the holding mechanism 46 is in the holding state shown by the solid line in the column (b) of fig. 4. Therefore, the holding claws 12b of the descending discharge valve 12 engage with the engaging members 46c of the holding mechanism 46, and the discharge valve 12 is held at a predetermined height by the holding mechanism 46. The drain valve 12 is held by the holding mechanism 46, whereby the drain port 10a is maintained in an open state, and the discharge of the washing water in the reservoir tank 10 to the toilet main body 2 is maintained. After the clutch mechanism 30 is disconnected and the drain port 10a is opened, the pilot valve 16d is still opened, and the washing water is discharged from the discharge unit 54 to the water storage unit 56. Therefore, the lowering of the float 26 in the sump portion 56 is restricted, and the lowering of the drain valve 12 is restricted.

Next, as shown in fig. 7, when the water level in the water reservoir 10 decreases, the float switch 42 that detects the water level in the water reservoir 10 is turned off. When the float switch 42 is off, the pilot valve 22c provided in the second control valve 22 is opened. Therefore, the washing water is supplied from the second control valve 22 into the water tank 10 through the water supply path 50. When the pilot valve 22c is opened, the controller 40 keeps the pilot valve 16d on the solenoid valve 18 side in the opened state when the large purge mode is selected by the controller 40. The washing water flowing in from the water supply pipe 38 is still discharged from the discharge unit 54 to the water storage unit 56 via the first control valve 16 and the drain valve hydraulic drive unit 14.

The washing water discharged from the discharge unit 54 is stored in the water storage unit 56. At this time, the washing water is discharged from the discharge hole 56b to the outside of the water accumulating portion 56 (into the water storage tank 10) in a very small amount. On the other hand, the instantaneous flow rate a1 (see fig. 7) of the washing water discharged from discharge hole 56b is smaller than the instantaneous flow rate a2 (see fig. 7) of the washing water discharged from discharge portion 54. The washing water discharged to the water storage part 56 is discharged into the water tank 10 beyond the upper end of the water storage part 56. In this way, the amount of washing water in the water accumulating unit 56 is not reduced, and the water level is maintained substantially equal to the water level in the standby state before the start of washing. Therefore, the water level in the water accumulating portion 56 is high, and therefore the float 26 is at a position floating by buoyancy, the transmission portion 48 is in a raised state, and the holding mechanism 46 is in a holding state shown by a solid line in the column (b) of fig. 4. Therefore, the holding claws 12b of the descending discharge valve 12 engage with the engaging members 46c of the holding mechanism 46, and the discharge valve 12 is held at a predetermined height by the holding mechanism 46. The drain valve 12 is held by the holding mechanism 46, whereby the drain port 10a is maintained in an open state, and the discharge of the washing water in the reservoir tank 10 to the toilet main body 2 is maintained.

Next, as shown in fig. 8, when the large cleaning mode is selected, the controller 40 closes the electromagnetic valve 18 and closes the first control valve 16 after a first time has elapsed from when the controller 40 opens the electromagnetic valve 18 (starts cleaning). The timing (the first elapsed time) at which the controller 40 closes the electromagnetic valve 18 is set in consideration of the following timings: as described later, when the water level in the water tank 10 is lowered to the predetermined water level WL1, the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed, and the flush water in the water accumulating portion 56 is lowered to lower the float 26. The first control valve 16 is closed, and therefore, the supply of the washing water to the drain valve hydraulic pressure driving part 14 and the drain part 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored to the outside of the float 26 in the water accumulating portion 56 in a state almost close to the full water level of the water accumulating portion 56, and the float 26a is in a state as shown in fig. 7 (a state of floating by receiving the buoyancy). Then, the washing water stored in water collector 56 is gradually discharged from discharge hole 56b, and the water level of the washing water in water collector 56 is lowered.

As shown in fig. 8, when the level of the washing water in the water accumulating portion 56 is lowered to a predetermined level WL3 (in this case, the level in the water tank 10 corresponds to the lowering to a predetermined level WL1), the position of the float 26 connected to the transmission portion 48 and the holding mechanism 46 is lowered. Thereby, the holding mechanism 46 is shifted to the non-holding state shown by the imaginary line in the column (b) of fig. 4. Thereby, the engagement between the engagement member 46c and the holding claw 12b of the drain valve 12 is released. By the holding mechanism 46 shifting to the non-holding state, the drain valve 12 disengages from the holding mechanism 46 and starts to descend again. The supply of the washing water from the second control valve 22 into the water reservoir 10 through the water supply path 50 is continued.

As shown in fig. 9, the descending drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. In this way, when the large flush mode is executed, the first flush water amount is discharged to the toilet main body 2 by holding the discharge valve 12 until the water level in the reservoir 10 decreases from the full water level WL to the predetermined water level WL 1.

On the other hand, since the float switch 42 is still in the off state, the water supply to the reservoir tank 10 is continued with the open state of the second control valve 22 maintained. The washing water supplied through the water supply path 50 reaches the water supply path branch portion 50a, and a part of the washing water branched at the water supply path branch portion 50a flows into the overflow pipe 10b, and the rest is stored in the water tank 10. The flush water flowing into the overflow pipe 10b flows into the flush toilet main body 2 and is used for replenishing the bowl portion 2 a. In a state where the drain valve 12 is closed, the washing water flows into the reservoir 10, and the water level in the reservoir 10 rises.

As shown in fig. 10, when the water level in the water tank 10 rises to a predetermined full water level WL, the float switch 42 is turned on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side closes. As a result, the pilot valve 22c is in a closed state, and therefore, the pressure in the pressure chamber 22b increases, the main valve body 22a of the second control valve 22 is closed, and the water supply is stopped. Since the water level in the water tank 10 rises to the predetermined full water level WL, the flush water flows into the water reservoir 56, the float 26 and the transmission part 48 rise, and the holding mechanism 46 returns to the holding state.

As shown in fig. 8, after the first control valve 16 is closed and the water supply to the drain valve hydraulic drive unit 14 is stopped, as shown in fig. 9 and 10, the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 gradually flows out from the gap 14d, and the piston 14b is pressed by the biasing force of the spring 14c, and accordingly, the rod 32 is lowered. Thereby, the clutch mechanism 30 is connected (columns (e) to (h) of fig. 3), and returns to the standby state before the toilet bowl flushing is started.

Next, the operation of the small purge mode will be described with reference to fig. 2 and 11 to 15.

As shown in fig. 2, the standby state of toilet flushing is the same as the large flush mode.

When receiving the instruction signal to perform the small purge, the controller 40 operates the electromagnetic valve 18 included in the first control valve 16 to open the first control valve 16. On the other hand, the controller 40 keeps the second control valve 22 closed. When the first control valve 16 is opened, as shown in fig. 11, the washing water flowing from the water supply pipe 38 is supplied to the drain valve hydraulic pressure driving portion 14 via the first control valve 16. Thereby, the piston 14b of the discharge valve hydraulic drive unit 14 is pushed up, the discharge valve 12 is lifted up via the rod 32, and the flush water in the reservoir tank 10 is discharged from the discharge port 10a to the toilet main body 2. When the discharge valve 12 is lifted, the holding claw 12b (column (a) in fig. 4) provided on the valve shaft 12a of the discharge valve 12 pushes up and rotates the engaging member 46c of the holding mechanism 46, and the holding claw 12b rides over the engaging member 46 c.

Next, as shown in fig. 12, when the drain valve 12 is further lifted, the clutch mechanism 30 is turned off. That is, when the drain valve 12 reaches a predetermined height, the upper end of the hook member 30b of the clutch mechanism 30 abuts against the bottom surface of the drain valve hydraulic drive unit 14, and the clutch mechanism 30 is disconnected (column (b) → (c) of fig. 3).

The discharge from the discharge portion 54 continues for a predetermined time. The washing water discharged from the discharge unit 54 is stored in the water storage unit 56. At this time, the washing water is discharged from the discharge hole 56b to the outside of the water accumulating portion 56 (into the water storage tank 10) in a very small amount. On the other hand, the instantaneous flow rate a1 (see fig. 7) of the washing water discharged from discharge hole 56b is smaller than the instantaneous flow rate a2 (see fig. 7) of the washing water discharged from discharge portion 54. The washing water discharged to the water storage part 56 is discharged into the water tank 10 beyond the upper end of the water storage part 56. In this way, the amount of washing water in the water accumulating unit 56 is not reduced, and the water level is maintained substantially equal to the water level in the standby state before the start of washing. Therefore, the water level in the water accumulating portion 56 is high, and therefore the float 26 is at a position floating by buoyancy, the transmission portion 48 is in a raised state, and the holding mechanism 46 is in a holding state shown by a solid line in the column (b) of fig. 4. Therefore, the holding claws 12b of the descending discharge valve 12 engage with the engaging members 46c of the holding mechanism 46, and the discharge valve 12 is held at a predetermined height by the holding mechanism 46. The drain valve 12 is held by the holding mechanism 46, whereby the drain port 10a is maintained in an open state, and the discharge of the washing water in the reservoir tank 10 to the toilet main body 2 is maintained.

Next, as shown in fig. 13, when the small purge mode is selected, the controller 40 closes the electromagnetic valve 18 and closes the first control valve 16 after a second time elapses from when the controller 40 opens the electromagnetic valve 18 (starts purging). The second time is shorter than the first time. The timing (the second elapsed time) at which the controller 40 closes the electromagnetic valve 18 is set in consideration of the following timings: as described later, when the water level in the water tank 10 is lowered to the predetermined water level WL2, the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed, and the flush water in the water accumulating portion 56 is lowered to lower the float 26. The first control valve 16 is closed, and therefore, the supply of the washing water to the drain valve hydraulic pressure driving part 14 and the drain part 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored to the outside of the float 26 in the water accumulating portion 56 in a state almost close to the full water level of the water accumulating portion 56, and the float 26 is in a state as shown in fig. 12 (a state of floating by receiving the buoyancy). Then, the washing water stored in water collector 56 is gradually discharged from discharge hole 56b, and the water level of the washing water in water collector 56 is lowered.

As shown in fig. 13, when the level of the washing water in the water accumulating portion 56 is lowered to a predetermined level WL4 (a level substantially equal to the predetermined level WL 3) (in this case, the level in the water tank 10 corresponds to the level lowered to the predetermined level WL 2), the position of the float 26 connected to the transmission portion 48 and the holding mechanism 46 is lowered. Thereby, the holding mechanism 46 is shifted to the non-holding state shown by the imaginary line in the column (b) of fig. 4. Thereby, the engagement between the engagement member 46c and the holding claw 12b of the drain valve 12 is released. By the holding mechanism 46 shifting to the non-holding state, the drain valve 12 disengages from the holding mechanism 46 and starts to descend again. The supply of the washing water from the second control valve 22 into the water reservoir 10 through the water supply path 50 is continued.

As shown in fig. 14, the descending drain valve 12 is seated on the drain opening 10a, and the drain opening 10a is closed. In this way, when the small flush mode is executed, the second flush water amount is discharged to the toilet main body 2 by holding the discharge valve 12 until the water level in the reservoir 10 decreases from the full water level WL to the predetermined water level WL 2.

As shown in fig. 15, when the water level in the water tank 10 rises to a predetermined full water level WL, the float switch 42 is turned on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side closes. As a result, the pilot valve 22c is in a closed state, and therefore, the pressure in the pressure chamber 22b increases, the main valve body 22a of the second control valve 22 is closed, and the water supply is stopped. Since the water level in the water tank 10 rises to the predetermined full water level WL, the flush water flows into the water reservoir 56, the float 26 and the transmission part 48 rise, and the holding mechanism 46 returns to the holding state.

As shown in fig. 13, after the first control valve 16 is closed and the water supply to the drain valve hydraulic drive unit 14 is stopped, as shown in fig. 14 and 15, the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 gradually flows out from the gap 14d, and the piston 14b is pressed by the urging force of the spring 14c, and accordingly, the rod 32 is lowered. Thereby, the clutch mechanism 30 is connected (columns (e) to (h) of fig. 3), and returns to the standby state before the toilet bowl flushing is started.

According to the flush water tank apparatus 4 of the first embodiment of the present invention, since the discharge valve 12 and the discharge valve hydraulic drive unit 14 are connected by the clutch mechanism 30 and the clutch mechanism 30 is disconnected at a predetermined timing, the discharge valve 12 can be moved and the discharge valve 12 can be closed regardless of the operation speed of the discharge valve hydraulic drive unit 14. Thus, even if there is a variation in the operating speed of the drain valve water pressure drive unit when the drain valve is lowered, the timing of closing the drain valve can be controlled without being affected by the variation. Further, when the first amount of cleaning water is selected by the remote control device 6, the holding mechanism 46 is engaged with the water discharge valve 12, and the valve control unit causes the holding mechanism 46 to operate so as to release the engagement between the holding mechanism 46 and the water discharge valve 12 when the first time elapses, and when the second amount of cleaning water is selected by the remote control device 6, the holding mechanism 46 is engaged with the water discharge valve 12, and the valve control unit causes the holding mechanism 46 to operate so as to release the engagement between the holding mechanism 46 and the water discharge valve 12 when the second time shorter than the first time elapses. In this way, when the second amount of cleaning water is selected by the remote control device 6, the valve control unit can operate the holding mechanism 46 so that the timing at which the drain port 10a is closed becomes earlier than when the first amount of cleaning water is selected. Therefore, according to the embodiment of the present invention, the first amount of washing water and the second amount of washing water can be set while using the clutch mechanism 30.

In the wash tank apparatus 4 according to the first embodiment of the present invention, the controller 40 controls the first control valve 16, and the valve control unit is operated by the wash water supplied from the first control valve 16. Thus, the first and second amounts of wash water can be set by lowering the discharge valve 12 for a predetermined time while using the clutch mechanism 30 with a relatively compact and simple configuration.

In the wash water tank apparatus 4 according to the first embodiment of the present invention, after the drain valve hydraulic pressure driving unit 14 raises the drain valve 12, the supply of wash water from the first control valve 16 to the valve control unit is started. Thus, the first and second amounts of cleaning water can be set by lowering the discharge valve 12 for a predetermined time using the clutch mechanism 30, without hindering the operation of the discharge valve hydraulic pressure drive unit 14 to raise the discharge valve 12 with cleaning water, and with a relatively compact and simple configuration.

Further, according to the wash tank apparatus 4 of the first embodiment of the present invention, since the first control valve 16 is provided to control the supply of the wash water to the drain valve hydraulic pressure driving unit 14, the first and second wash water amounts can be set by lowering the drain valve 12 for a predetermined time period while using the clutch mechanism 30, with a relatively compact and simple configuration.

Further, according to the wash water tank apparatus 4 of the first embodiment of the present invention, the first control valve 16 supplies wash water to the valve control part via the drain valve hydraulic pressure driving part 14. Accordingly, it is possible to suppress the generation of relatively wasteful washing water that does not contribute to the operation of either the drain valve water pressure driving unit 14 or the valve control unit in the washing water supplied from the first control valve 16 by a relatively compact and simple configuration, and it is possible to effectively use the washing water in the drain valve water pressure driving unit 14 and the valve control unit.

Further, according to the wash water tank apparatus 4 of the first embodiment of the present invention, when the float 26 is raised due to the wash water stored in the water storage unit 56, the holding mechanism 46 arranges the engagement member 46c at a position where it can be engaged with the drain valve 12, and when the float 26 is lowered, the holding mechanism 46 moves the engagement member 46c to a position where it is released from engagement with the drain valve 12. By using the water storage unit 56 and the float 26 provided in the water storage unit 56 in this manner, it is possible to suppress the influence of variations in the flow rate of the washing water supplied to the water storage unit 56, and to realize a relatively stable operation of the holding mechanism 46 with a relatively simple configuration. Therefore, according to the embodiment of the present invention, the first amount of washing water and the second amount of washing water can be set relatively stably while using the clutch mechanism 30.

Further, according to the wash water tank apparatus 4 of the first embodiment of the present invention, after the clutch mechanism 30 is turned off, the supply of wash water from the first control valve 16 to the valve control portion is started. Thus, the first and second amounts of cleaning water can be set by lowering the discharge valve 12 for a predetermined time using the clutch mechanism 30, without hindering the operation of the discharge valve hydraulic pressure drive unit 14 to raise the discharge valve 12 with cleaning water, and with a relatively compact and simple configuration.

Further, a toilet apparatus including a plurality of washing modes having different amounts of washing water according to a first embodiment of the present invention includes: washing the toilet with water; and a water tank device according to the present invention configured to supply washing water to the water closet.

Further, according to the wash tank apparatus 4 of the first embodiment of the present invention, since the discharge valve 12 and the discharge valve hydraulic drive unit 14 are connected by the clutch mechanism 30 and the clutch mechanism 30 is cut off at a predetermined timing, the discharge valve 12 can be moved and the discharge valve 12 can be closed regardless of the operation speed of the discharge valve hydraulic drive unit 14. Thus, even if there is a variation in the operating speed of the drain valve water pressure drive unit when the drain valve is lowered, the timing of closing the drain valve can be controlled without being affected by the variation. When the second amount of washing water is selected by the remote control device 6, the washing water is supplied from the discharge unit 54 into the water storage unit 56, and the timing control mechanism operates in accordance with the vertical movement of the float 26. The timing control means lowers the discharge valve 12 so that the timing at which the discharge port 10a is closed becomes earlier when the second amount of cleaning water is selected than when the first amount of cleaning water is selected. Thus, the first and second amounts of wash water can be set while using the clutch mechanism 30.

Further, according to the wash water tank apparatus 4 of the first embodiment of the present invention, by accumulating a smaller amount of wash water than the amount of wash water that drives the piston 14b of the discharge valve hydraulic drive unit 14 between the water accumulation unit 56 and the float 26, the float 26 moves up and down, and the timing control mechanism can operate earlier with the smaller amount of wash water.

Further, according to the wash water tank device 4 of the first embodiment of the present invention, since the drain 54 forms the downward discharge port, the drain 54 can easily supply wash water to the lower portion between the water reservoir 56 and the float 26, and the timing control mechanism can be operated by moving the float 26 up and down in an early stage with a relatively small amount of wash water.

Further, according to the wash water tank device 4 of the first embodiment of the present invention, since at least a part of the water storage unit 56 is located below the water stop level of the drain unit 54, buoyancy by wash water equal to or lower than the water stop level in the drain unit 54 can be generated in the float 26 in a state where the drain unit 54 stores the wash water up to the water stop level, and the timing control mechanism can be operated by supplying a smaller amount of wash water to the water storage unit 56.

Further, according to the wash water tank device 4 of the first embodiment of the present invention, since the drain hole 56b for draining the accumulated wash water is formed in the water accumulation unit 56, the water accumulation unit 56 can achieve both of the accumulation of the wash water and the drainage of the wash water with a relatively simple configuration.

Further, according to the wash water tank apparatus 4 of the first embodiment of the present invention, it is possible to suppress the flow of wash water discharged from the discharge port 56b from acting on the devices provided on the discharge valve 12 side, for example, the devices such as the timing control mechanism, and causing malfunction of the devices.

Further, according to the wash water tank device 4 of the first embodiment of the present invention, since the instantaneous flow rate of the wash water discharged from the discharge hole 56b is smaller than the instantaneous flow rate of the wash water discharged from the discharge portion 54, the wash water can be efficiently stored in the water storage portion 56, and the timing control mechanism can be operated by supplying a smaller amount of the wash water to the water storage portion 56.

Further, according to the wash tank apparatus 4 of the first embodiment of the present invention, the timing control means can operate stably by a relatively simple mechanical structure, and can lower the discharge valve 12 so that the timing at which the discharge port 10a is closed when the second amount of wash water is selected is earlier than when the first amount of wash water is selected.

Next, a washing water tank device 104 according to a second embodiment of the present invention will be described with reference to fig. 16 to 24.

In the present embodiment, the same reference numerals are given to the same portions as those of the cleaning water tank device 4 according to the first embodiment of the present invention, and the description thereof will be omitted.

Next, a toilet apparatus according to a second embodiment of the present invention will be described with reference to the drawings.

A wash water tank device 104 according to a second embodiment of the present invention shown in fig. 16 is provided in the toilet bowl device 1 (see fig. 1) in the same manner as the first embodiment of the present invention.

The flush water tank device 104 includes a clutch mechanism 130 for lowering the discharge valve 12 when the valve is shut off, and the clutch mechanism 130 connects the discharge valve 12 to the discharge valve hydraulic drive unit 14 and lifts up the discharge valve 12 by the driving force of the discharge valve hydraulic drive unit 14. The case 13 is connected and fixed to the drain valve hydraulic pressure driving portion 14.

The drain valve 12 is lifted by the driving force of the drain valve hydraulic driving unit 14, the clutch mechanism 130 is cut off at a predetermined height or at a predetermined timing, and the drain valve 12 is lowered by its own weight. By controlling the predetermined time until the clutch mechanism 130 is turned off, the time until the water discharge valve 12 is lowered and the water discharge valve 12 is seated on the water discharge port 10a is adjusted.

Next, the structure and operation of the clutch mechanism 130 will be described with reference to fig. 17.

Fig. 17 schematically shows the configuration of the clutch mechanism 130, and shows the operation when lifted up by the drain valve hydraulic drive portion 14. Since the structure and operation of the clutch mechanism 130 in the second embodiment are similar to those of the clutch mechanism 30 in the first embodiment, the description of the same portions will be omitted and the description of different portions will be mainly given below.

First, as shown in fig. 16, the clutch mechanism 130 is provided at the lower end of the stem 32 extending downward from the discharge valve hydraulic drive unit 14, and is configured to connect the lower end of the stem 32 to the upper end of the valve shaft 12a of the discharge valve 12 and to release the connection between the lower end of the stem 32 and the upper end of the valve shaft 12a of the discharge valve 12. The clutch mechanism 130 includes: a rotating shaft 130a fitted to the lower end of the lever 32; a hook member 130b supported by the rotation shaft 130 a; an engaging claw 30c provided at the upper end of the valve shaft 12 a; and a stopper 130f that defines an upper limit of the lift height of the clutch mechanism 130. With such a configuration, the clutch mechanism 130 is cut off at a predetermined timing and at a predetermined lift height, and the drain valve 12 is lowered.

The rotary shaft 130a is fitted to the lower end of the lever 32 so as to be oriented in the horizontal direction, and is rotatably supported. The hook member 130b is a plate-shaped member, and an intermediate portion thereof is rotatably supported by the rotation shaft 130 a. Further, the lower end of the hook member 130b is bent into a hook shape, and a hook portion 130d is formed. The hook member 130b is formed to extend upward and downward in a splayed shape from the rotation shaft 130 a. The upper end portion of the hook member 130b is formed at the upper portion of the hook member 130b extending upward from the rotation shaft 130a, and the upper end portion 130e of the hook member 130b is formed at a length and position such that it does not come into contact with the bottom surface of the drain valve hydraulic drive unit 14 even in a state where the piston 14b is lifted the most. In the hook member 130b, a lower portion extending downward from the rotation shaft 130a extends obliquely downward as a lower portion in a splay shape, and then forms a hook portion 130d of the hook member 130b that returns toward the valve shaft 12 a. The engaging claw 30c provided at the upper end of the valve shaft 12a of the water discharge valve 12 is a plate-shaped claw. The bottom side of the engaging claw 30c is formed to be substantially horizontal. The baffle 130f is formed to come into contact with the bottom surface of the drain valve hydraulic drive unit 14 and stop the lifting thereof before the upper end portion 130e of the hook member 130b in the connected state comes into contact with the bottom surface of the drain valve hydraulic drive unit 14.

In the state shown in fig. 16, the drain valve 12 is seated on the drain opening 10a, and the drain opening 10a is closed. In this state, the discharge valve water pressure driving unit 14 is coupled to the discharge valve 12, and in this coupled state, the hook portion 130d of the hook member 130b is engaged with the bottom edge of the engaging claw 30c, and the discharge valve 12 can be lifted up by the lever 32.

Referring back to fig. 16 again, the water reservoir portion and the like of the cleaning tank device 4 will be described.

The wash water tank device 104 further includes: a discharge unit 54 for discharging the supplied washing water; a water reservoir 156 for storing the washing water discharged from the discharge unit 54; a transfer part 148 connected to the water accumulation part 156; and an action part 158 coupled to the transmission part 148 and moving laterally.

All or a part of the drain valve hydraulic pressure drive unit 14, the discharge unit 54, the water storage unit 156, the transmission unit 148, and the action unit 158 functions as a valve control unit. The valve control portion is formed to be able to cut off the clutch mechanism 130 at a predetermined timing. The wash water tank device 104 includes such a valve control unit. When the first amount of washing water is selected by the remote control device 6 or the like, the valve control unit operates to block the clutch mechanism 130 after the first time elapses, and lowers the drain valve 12 after the first time elapses. When the second amount of wash water is selected by the remote control device 6 or the like, the valve control unit operates to shut off the clutch mechanism 130 when a second time shorter than the first time elapses, and lowers the drain valve 12 when the second time elapses. In this way, the valve control portion is configured to be operated by the supplied washing water.

When the second amount of washing water is selected by the remote control device 6, the drain unit 54 drains the supplied washing water. The drain 54 is configured to drain the washing water even when the first amount of washing water is selected by the remote control device 6. The discharge portion 54 is formed at the lower end of the driving portion drain passage 34b, and extends downward. The discharge portion 54 is provided above the upper surface of the housing 13. The discharge portion 54 is disposed outside the housing 13 and above the full water level WL. The discharge portion 54 forms a discharge port having a narrow tip and directed downward. Therefore, the washing water is accelerated downward by gravity, and the flow path is narrowed at the discharge port, so that the flow velocity thereof is further accelerated. The discharge portion 54 is disposed inside the side wall of the water storage portion 156 and above the full water level WL.

At least a part of water reservoir 156 is located above the water stop level (full water level WL) of water tank 10 in the standby state before the start of cleaning. More preferably, the water accumulation portion 156 is located above the water stop level (full water level WL) of the reservoir tank 10 in the standby state before the start of cleaning. The water reservoir 156 is formed in a hollow box shape, and has an open upper surface. The water reservoir 156 is disposed above the housing 13. Water reservoir 156 is disposed below discharge unit 54 and is configured to receive the washing water discharged from discharge unit 54. The volume of the washing water stored in the water storage portion 156 is smaller than the volume of the cylinder 14 a. The water accumulating portion 156 is provided with a discharge hole 56b for discharging the accumulated washing water. The discharge hole 56b is formed in a lower portion of the side wall 56c of the water accumulating portion 156, and is opened toward the opposite side to the valve shaft 12a of the water discharge valve 12 in a plan view. The discharge hole 56b forms a small hole having a relatively small diameter. Therefore, the instantaneous flow rate a1 (see fig. 7) of the washing water discharged from the discharge hole 56b to the outside of the water storage unit 156 (inside the water storage tank 10) is smaller than the instantaneous flow rate a2 (see fig. 7) of the washing water discharged from the discharge unit 54.

The transmission portion 148 is formed as a rod-like member extending vertically downward from the lower surface of the water accumulation portion 156. The transmission part 148 is fixed to the lower surface of the water storage part 156. The transmission portion 148 extends through the top surface of the housing 13 to the inside of the housing 13. The transmission unit 148 is not fixed to the housing 13, and is disposed slidably with respect to the housing 13. A spring 149 is disposed outside the transmission part 148, and the spring 149 is fixed to the water storage part 156 and the housing 13. Therefore, when the weight of water accumulating unit 156 is reduced after water accumulating unit 156 and transmission unit 148 are lowered, water accumulating unit 156 and transmission unit 148 are raised again by spring 149 and returned to the standby position. The transmission unit 148 is coupled to the action unit 158 via a rotatable transmission unit-side rotating shaft 160. The transmission portion side rotating shaft 160 rotatably supports the acting portion 158 and the transmission portion 148. The transmission unit side rotating shaft 160 is a shaft extending in a direction perpendicular to the paper surface of fig. 16. The action portion 158 further has a tip-side rotation shaft 162 that allows the tip side to rotate. The distal-end-side rotating shaft 162 rotatably supports the distal-end-side portion and the transmission-portion-side portion of the working portion 158. The distal end side rotation shaft 162 is also a shaft extending in a direction orthogonal to the paper surface of fig. 16. The tip-side rotation shaft 162 is attached to the housing 13 so as to be located on the imaginary line B1 and move along the imaginary line B1. The imaginary line B1 substantially coincides with the height of the rotating shaft 130a in the state where the drain valve 12 is lifted at the highest. Therefore, the transmission unit 148 can move up and down in the same manner according to the up and down movement of the float 26, and the operation unit 158 can be pushed out or pulled back in the lateral direction.

The acting portion 158 is formed to be movable in the left-right direction at a predetermined height below the bottom surface of the drain valve hydraulic pressure driving portion 14. The acting portion 158 moves laterally in such a manner as to advance toward the valve shaft 12a as the transmitting portion 148 descends. The tip end 158a of the action portion 158 is positioned in a space between the hook members 130b that are splayed in the state where the hook members 130b are lifted at the highest position in the state of advancing (see fig. 18). Further, the acting portion 158 moves laterally so as to retreat in a direction away from the valve shaft 12a when the transmission portion 148 ascends. The tip 158a of the action portion 158 is formed as a relatively large projection having a semicircular cross section. The action portion 158 controls the timing of lowering the discharge valve 12 so that the timing at which the discharge port 10a is closed when the second amount of cleaning water is selected is earlier than the timing at which the first amount of cleaning water is selected, together with the operations of the transmission portion 148, the water storage portion 156, and the like.

The acting portion 158 extends to the valve shaft 12a side of the upper end portion 130e of the hook member 130b in a state where the water storage portion 156 and the transmission portion 148 are lowered. If the action portion 158 is simply moved to the space between the splayed hook members 130b, the hook members 130b do not operate. When the supply of the washing water to the drain valve hydraulic pressure driving unit 14 is stopped and the piston 14b moves downward, the upper end portion 130e of the hook member 130b contacts the operating portion 158, the hook member 130b rotates, and the clutch mechanism 130 is disengaged.

Next, the operation of the wash water tank device 104 according to the second embodiment of the present invention and the water closet device 1 including the wash water tank device 104 will be described with reference to fig. 16 to 22.

First, in the standby state of toilet cleaning shown in fig. 16, the water level in the reservoir 10 is at the predetermined full water level WL, and in this state, both the first control valve 16 and the second control valve 22 are closed. Water reservoir 156 does not store wash water, and water reservoir 156 and transmission 148 are biased upward by spring 149. The acting portion 158 is pulled by the transmission portion 148 to be located at a position retreated from the valve shaft 12 a. Next, when the user presses the large wash button of the remote control device 6 (fig. 1), the remote control device 6 transmits an instruction signal for executing the large wash mode to the controller 40 (fig. 16). Further, when the small wash button is pressed, an instruction signal for executing the small wash mode is transmitted to the controller 40.

Next, the operation of the large cleaning mode will be described with reference to fig. 16 to 22.

Upon receiving the instruction signal to perform the large purge, the controller 40 operates the solenoid valve 18 (fig. 16) included in the first control valve 16 to unseat the pilot valve 16d on the solenoid valve side from the pilot valve port. This reduces the pressure in the pressure chamber 16c, and the main valve body 16a is unseated from the main valve port 16b and the main valve port 16b is opened. When the first control valve 16 is opened, as shown in fig. 17, the washing water flowing from the water supply pipe 38 is supplied to the drain valve hydraulic pressure driving portion 14 via the first control valve 16. Thereby, the piston 14b of the discharge valve hydraulic drive unit 14 is pushed up, the discharge valve 12 is lifted up via the rod 32, and the flush water in the reservoir tank 10 is discharged from the discharge port 10a to the toilet main body 2. At this time, the pilot valve 16d is still in the open state, and the washing water flowing from the water supply pipe 38 is continuously supplied to the drain valve hydraulic drive unit 14 via the first control valve 16. When the piston 14b is raised to the second position (the state where the piston is pushed up most), the drive unit water supply passage 34a and the drive unit water discharge passage 34b communicate with each other through the inside of the cylinder 14a, and therefore the washing water is discharged from the discharge unit 54 to the water storage unit 156. Therefore, after the drain valve hydraulic pressure driving unit 14 raises the drain valve 12, the supply of the washing water from the first control valve 16 to the water storage unit 156 is started. Even in a state where the drain valve 12 is raised and the flapper 130f is in contact with the bottom surface of the drain valve hydraulic drive unit 14, the upper end portion 130e of the hook member 130b of the clutch mechanism 130 is not in contact with the bottom surface of the drain valve hydraulic drive unit 14. Thus, the clutch mechanism 130 remains connected. Therefore, the drain valve 12 is kept in a lifted state. On the other hand, when the supply of the washing water to water storage unit 156 is started, water storage unit 156 and transmission unit 148 gradually descend, and thus action unit 158 starts to move toward valve shaft 12 a. The controller 40 keeps the second control valve 22 closed.

As shown in fig. 18, the supply of the washing water to the drain valve hydraulic pressure driving part 14 via the first control valve 16 is continued. The piston 14b of the drain valve hydraulic drive unit 14 is pushed up most, and the lever 32 and the clutch mechanism 130 are also lifted up most. Since the piston 14b is at the second position (the most pushed-up state), the drain valve hydraulic pressure driving unit 14 supplies the drain unit 54 with the washing water. Since instantaneous flow rate a1 of the washing water discharged from discharge hole 56b of water collector 156 is smaller than instantaneous flow rate a2 of the washing water discharged from discharge unit 54, the water level of the washing water in water collector 156 gradually rises. When the water level of the washing water in water accumulating unit 156 becomes substantially the full water level in water accumulating unit 156, water accumulating unit 156 and transfer unit 148 are lowered by the weight of the washing water. The action portion 158 moves so as to further project in the lateral direction due to the lowering of the transmission portion 148. The tip end 158a of the action portion 158 is located in a space between the hook members 130b that are stationary in the state of being lifted highest. The upper end 130e of the hook member 130b is positioned above the distal end 158a and is separated from the distal end 158 a. Therefore, the clutch mechanism 130 is not yet disengaged and continues to be in the holding state.

Next, as shown in fig. 19, when the water level in the water reservoir 10 decreases, the float switch 42 that detects the water level in the water reservoir 10 is turned off. When the float switch 42 is off, the pilot valve 22c provided in the second control valve 22 is opened. Therefore, the washing water is supplied from the second control valve 22 into the water tank 10 through the water supply path 50. When the pilot valve 22c is opened, the controller 40 keeps the pilot valve 16d on the solenoid valve 18 side in the opened state when the large purge mode is selected by the controller 40. The washing water flowing in from the water supply pipe 38 is still discharged from the discharge unit 54 to the water storage unit 156 via the first control valve 16 and the drain valve hydraulic drive unit 14. Therefore, the amount of washing water in water accumulating portion 156 is maintained at substantially the full water level of water accumulating portion 156 without decreasing. Therefore, the water storage unit 156 and the transmission unit 148 are in a lowered state, and the tip end 158a of the action unit 158 is positioned in the space between the hook members 130 b.

Next, as shown in fig. 20, when the large cleaning mode is selected, the controller 40 closes the electromagnetic valve 18 and closes the first control valve 16 after a first time has elapsed from when the controller 40 opens the electromagnetic valve 18 (starts cleaning). The timing (the first elapsed time) at which the controller 40 closes the electromagnetic valve 18 is set in consideration of the following timings: as described later, when the water level in the reservoir tank 10 is lowered to the predetermined water level WL1, the discharge valve 12 is seated on the discharge port 10a, and the discharge port 10a is closed, and the piston 14b starts to descend, and the clutch mechanism 130 is turned off. The first control valve 16 is closed, and therefore, the supply of the washing water to the drain valve hydraulic pressure driving part 14 and the drain part 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water accumulating portion 156 until the water accumulating portion 156 is almost full of water, and the water accumulating portion 156 is lowered by the weight of the washing water. Therefore, the tip end portion 158a of the action portion 158 is positioned and stopped in the space between the hook members 130 b.

Further, since the supply of the washing water to the drain valve hydraulic pressure driving portion 14 is stopped, the washing water in the cylinder 14a gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c, and the rod 32 is lowered accordingly. Thereby, the upper end portion 130e of the hook member 130b abuts on the distal end portion 158a, and the upper end portion 130e rotates counterclockwise about the rotation shaft 130 a. Along with this rotation, the lower portion of the hook member 130b and the hook 130d rotate in a manner to be lifted. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 130 is turned off, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water reservoir 10 through the water supply path 50 is continued.

As shown in fig. 21, the descending drain valve 12 is seated on the drain opening 10a, and the drain opening 10a is closed. In this way, when the large flush mode is executed, the first flush water amount is discharged to the toilet main body 2 by holding the discharge valve 12 until the water level in the reservoir 10 decreases from the full water level WL to the predetermined water level WL 1. Then, the washing water stored in water storage unit 156 is gradually discharged from discharge hole 56b, and the water level of the washing water in water storage unit 156 is lowered. When the washing water in water accumulating unit 156 is drained or reduced, water accumulating unit 156 and transfer unit 148 are raised again by spring 149 and returned to the standby position. Therefore, the acting portion 158 also moves backward in a direction away from the valve shaft 12a in response to the rise of the transmission portion 48. The piston 14b is further lowered as the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 flows out.

Since the float switch 42 is still in the off state, the water is continuously supplied to the reservoir 10 while the second control valve 22 is kept in the open state. The washing water supplied through the water supply path 50 reaches the water supply path branch portion 50a, and a part of the washing water branched at the water supply path branch portion 50a flows into the overflow pipe 10b, and the rest is stored in the water tank 10. The flush water flowing into the overflow pipe 10b flows into the flush toilet main body 2 and is used for replenishing the bowl portion 2 a. In a state where the drain valve 12 is closed, the washing water flows into the reservoir 10, and the water level in the reservoir 10 rises.

As shown in fig. 22, when the water level in the water tank 10 rises to a predetermined full water level WL, the float switch 42 is turned on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side closes. As a result, the pilot valve 22c is in a closed state, and therefore, the pressure in the pressure chamber 22b increases, the main valve body 22a of the second control valve 22 is closed, and the water supply is stopped.

The washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c, and the rod 32 is lowered accordingly. When the hook 130d is lowered to the position of the engagement claw 30c, it descends along the inclined surface of the engagement claw 30c, and when it passes over the engagement claw 30c, it is rotated to the original position by gravity, the hook 130d and the engagement claw 30c are engaged again, the clutch mechanism 130 is connected, and the lever 32 and the valve shaft 12a are connected. Therefore, the toilet returns to the standby state before the toilet bowl cleaning is started.

Next, the operation of the small wash mode will be described with reference to fig. 16, 17 to 19, 22, 23, and 24.

As shown in fig. 16, the standby state of toilet flushing is the same as the large flush mode.

When receiving the instruction signal to perform the small purge, the controller 40 operates the electromagnetic valve 18 included in the first control valve 16 to open the first control valve 16. Thereafter, the water storage unit 156 and the transmission unit 148 are lowered as shown in fig. 16 and 17 to 19, and the operation until the tip end 158a of the action unit 158 is positioned in the space between the hook members 130b is the same as in the large cleaning mode. Therefore, the operation in the small cleaning mode as described above is explained with reference to fig. 16, 17 to 19, and the operation in the large cleaning mode, and the explanation thereof is omitted.

Next, as shown in fig. 23, when the small purge mode is selected, the controller 40 closes the electromagnetic valve 18 and closes the first control valve 16 after a second time elapses from when the controller 40 opens the electromagnetic valve 18 (starts purging). The second time is set to a time shorter than the first time. The timing (the second elapsed time) at which the controller 40 closes the electromagnetic valve 18 is set in consideration of the following timings: as described later, when the water level in the reservoir tank 10 is lowered to the predetermined water level WL2, the discharge valve 12 is seated on the discharge port 10a, and the discharge port 10a is closed, and the piston 14b starts to descend, and the clutch mechanism 130 is turned off. The first control valve 16 is closed, and therefore, the supply of the washing water to the drain valve hydraulic pressure driving part 14 and the drain part 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water accumulating portion 156 until the water accumulating portion 156 is almost full of water, and the water accumulating portion 156 is lowered by the weight of the washing water. Therefore, the tip end portion 158a of the action portion 158 is positioned and stopped in the space between the hook members 130 b.

Since the supply of the washing water to the drain valve hydraulic pressure driving unit 14 is stopped, the washing water in the cylinder 14a gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c, and the rod 32 is lowered accordingly. Thereby, the upper end portion 130e of the hook member 130b abuts on the distal end portion 158a, and the upper end portion 130e rotates counterclockwise about the rotation shaft 130 a. Along with this rotation, the lower portion of the hook member 130b and the hook 130d rotate in a manner to be lifted. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 130 is turned off, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water reservoir 10 through the water supply path 50 is continued.

As shown in fig. 24, the descending drain valve 12 is seated on the drain opening 10a, and the drain opening 10a is closed. In this way, when the small flush mode is executed, the second flush water amount smaller than the first flush water amount is discharged to the toilet main body 2 while the drain valve 12 is held until the water level in the reservoir 10 decreases from the full water level WL to the predetermined water level WL 2. Then, the washing water stored in water storage unit 156 is gradually discharged from discharge hole 56b, and the water level of the washing water in water storage unit 156 is lowered. When the washing water in water accumulating unit 156 is drained or reduced, water accumulating unit 156 and transfer unit 148 are raised again by spring 149 and returned to the standby position. Therefore, the acting portion 158 also moves backward in a direction away from the valve shaft 12a in response to the rise of the transmission portion 148. The piston 14b is further lowered as the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 flows out.

Since the float switch 42 is still in the off state, the water is continuously supplied to the reservoir 10 while the second control valve 22 is kept in the open state. The washing water supplied through the water supply path 50 reaches the water supply path branch portion 50a, and a part of the washing water branched at the water supply path branch portion 50a flows into the overflow pipe 10b, and the rest is stored in the water tank 10. The flush water flowing into the overflow pipe 10b flows into the flush toilet main body 2 and is used for replenishing the bowl portion 2 a. In a state where the drain valve 12 is closed, the washing water flows into the reservoir 10, and the water level in the reservoir 10 rises. Then, when the water level in the reservoir tank 10 rises to the predetermined full water level WL, the float switch 42 is turned on. The operation of the cleaning water tank device 104 and the like until the subsequent return to the standby state is the same as the operation in the large cleaning mode as shown in fig. 22, and therefore, the description thereof is omitted.

According to the flush water tank apparatus 4 of the second embodiment of the present invention, since the discharge valve 12 and the discharge valve hydraulic drive unit 14 are connected by the clutch mechanism 130 and the clutch mechanism 130 is cut off at a predetermined timing, the discharge valve 12 can be moved and the discharge valve 12 can be closed regardless of the operation speed of the discharge valve hydraulic drive unit 14. Further, when the remote control device 6 selects the first amount of washing water, the valve control unit operates to block the clutch mechanism 130 when the first time elapses and lower the discharge valve 12 when the first time elapses, and when the remote control device 6 selects the second amount of washing water, the valve control unit operates to block the clutch mechanism 130 when the second time shorter than the first time elapses and lower the discharge valve 12 when the second time elapses. In this way, when the second amount of cleaning water is selected by the remote control device 6, the valve control unit can block the clutch mechanism 130 at a timing when the drain port 10a is closed earlier than when the first amount of cleaning water is selected. Therefore, according to the embodiment of the present invention, the first amount of cleaning water and the second amount of cleaning water can be set by lowering the discharge valve 12 for a predetermined time while using the clutch mechanism 130.

While the first and second embodiments of the present invention have been described above, various modifications may be made to the first and second embodiments described above. For example, in the second embodiment described above, the working portion 158 advances toward the valve shaft 12a when the water accumulation portion 156 and the transmission portion 148 descend, but as a modification, the rod member of the piston cylinder may advance toward the valve shaft 12a and the clutch mechanism 130 may be cut off by the rod member at an arbitrary timing. With this configuration, the cylinder portion of the piston cylinder is connected to the water supply path 50 extending from the second control valve 22, and the rod member is pushed and moved by the washing water supplied into the cylinder portion. The lever member is formed to move laterally toward the valve shaft below the bottom surface of the discharge valve hydraulic drive unit 14. The tip of the lever member is formed in a T-shape, and the upper end of the T-shape is disposed in the vicinity of the bottom surface of the drain valve hydraulic pressure driving portion. The T-shaped portion is formed in a flat plate shape extending in the longitudinal direction. The upper end portion 130e of the hook member 130b contacts the upper end of the T-shape, the clutch mechanism 130 is cut off, and the drain valve 12 is lowered.

When the large cleaning mode is selected, the controller 40 opens the electromagnetic valve 24 and opens the second control valve 22 after a first time elapses from when the controller 40 opens the electromagnetic valve 18 (starts cleaning). Thereby, the washing water is supplied from the second control valve 22 into the cylinder portion, and the lever member moves laterally toward the valve shaft 12 a. When the lever member hits the upper end portion 130e of the hook member 130b, the hook member rotates, the clutch mechanism 130 is cut off, and the drain valve 12 is lowered. The timing (the first elapsed time) at which the controller 40 opens the electromagnetic valve is set in consideration of the following timings: when the water level in the reservoir tank is lowered to a predetermined water level WL1, the water discharge valve 12 is seated on the water discharge opening 10a, and the water discharge opening is closed, the lever member abuts on the hook member 130b, and the clutch mechanism 130 is turned off. This allows the discharge valve 12 to be lowered to execute a large washing mode in which the second amount of washing water is discharged.

When the small washing mode is selected, the controller 40 opens the electromagnetic valve 24 and opens the second control valve 22 after a second time shorter than the first time elapses from when the controller 40 opens the electromagnetic valve 18 (starts washing). Thereby, the washing water is supplied from the second control valve 22 into the cylinder portion, and the lever member moves laterally toward the valve shaft 12 a. When the lever member hits the upper end portion 130e of the hook member 130b, the hook member rotates, the clutch mechanism 130 is cut off, and the drain valve 12 is lowered. The timing at which the controller 40 opens the electromagnetic valve (the second elapsed time) is set in consideration of the following timings: as described later, when the water level in the reservoir tank 10 is lowered to the predetermined water level WL2, the water discharge valve 12 is seated on the water discharge port 10a, and the water discharge port is closed, and the lever member abuts on the hook member, and the clutch mechanism 130 is turned off. This allows the discharge valve 12 to be lowered to execute a small washing mode in which the second amount of washing water is discharged.

For example, in the second embodiment described above, the action unit 158 moves forward toward the valve shaft 12a when the water accumulation unit 156 and the transmission unit 148 move downward, but as a modification, the washing water may be discharged from the discharge unit toward the clutch mechanism 130, and the clutch mechanism 130 may move downward at an arbitrary timing to block the discharged washing water. The clutch mechanism 130 is configured such that the clutch mechanism 130 is not disengaged by only lifting up the drain valve 12, as in the second embodiment. When the supply of the washing water to the drain valve hydraulic pressure driving unit 14 is stopped and the piston 14b moves downward, the clutch mechanism 130 gradually moves downward in the connected state. At a position lowered to a height position lower than the highest lifting position, for example, the hook member 130b of the clutch mechanism 130 is rotated by the washing water discharged from the discharge portion, and the clutch mechanism 130 is cut off.

In such a configuration, the first control valve 16, the drain valve hydraulic pressure drive unit 14, and the discharge unit function as a valve control unit. The valve control portion is formed to be able to cut off the clutch mechanism 130 at a predetermined timing. The cleaning water tank device 4 includes such a valve control unit. When the first amount of washing water is selected by the remote control device 6 or the like, the valve control unit operates to shut off the clutch mechanism 130 by the washing water discharged from the discharge unit acting on the clutch mechanism 130 after the first time has elapsed, and the drain valve 12 is lowered after the first time has elapsed. Therefore, the drain valve 12 can be lowered at a timing corresponding to the original predetermined water level WL1, and the large flush mode can be executed. When the second amount of washing water is selected by the remote control device 6 or the like, the valve control unit operates to stop the clutch mechanism 130 by discharging the washing water from the discharge unit to act on the clutch mechanism 130 after a second time shorter than the first time has elapsed, and the drain valve 12 is lowered after the second time has elapsed. Therefore, the drain valve 12 can be lowered at a timing corresponding to the original predetermined water level WL2, and the small flush mode can be executed. The above-described modifications are exemplified, but the structures of the modifications, the structure of the first embodiment, and the structure of the second embodiment may be arbitrarily combined or extracted and changed.

For example, in the first embodiment described above, the transmission unit 48 is connected to the holding mechanism 46, but as a modification, a single float device may be connected to the holding mechanism 46, and the transmission unit 48 may press the upper surface of the float device.

With this configuration, when the water level in the water accumulating portion 56 decreases, the float device and the transmission portion 48 descend due to their own weight, the float device is pushed down, and the holding mechanism 46 is switched from the holding state to the non-holding state. Thus, the drain valve 12 is lowered.

Similarly to the present invention, when the controller 40 selects the large purge mode, the controller 40 causes the solenoid valve 18 to be continuously opened. Therefore, the washing water flowing in from the water supply pipe 38 is still discharged from the discharge unit 54 to the water storage unit 56 via the first control valve 16 and the drain valve hydraulic pressure driving unit 14. Therefore, the water level in the water accumulation portion 56 is high, the float is in the floating position, and the holding mechanism 46 is in the holding state.

Here, the drain portion 54 continues to drain for a predetermined time, the transmission portion 48 does not operate so as to press the float device, the float device descends in conjunction with the water level (WL1) in the reservoir tank 10 as it is, and the holding mechanism 46 is switched to the non-holding state. Therefore, the drain valve 12 can be lowered at a timing corresponding to the predetermined water level WL1, and the large flush mode can be executed.

When the small purge mode is selected, the controller 40 causes the solenoid valve 18 to be continuously opened by the controller 40. Therefore, the washing water flowing in from the water supply pipe 38 is still discharged from the discharge unit 54 to the water storage unit 56 via the first control valve 16 and the drain valve hydraulic pressure driving unit 14. Therefore, the water level in the water accumulation portion 56 is high, the float is in the floating position, and the holding mechanism 46 is in the holding state. Next, when the small purge mode is selected, the controller 40 opens the electromagnetic valve 18 (starts purging) from the controller 40, and then closes the electromagnetic valve 18 and closes the first control valve 16 after a second time elapses. The second time is shorter than the first time. The timing (the second elapsed time) at which the controller 40 closes the electromagnetic valve 18 is set in consideration of the following timings: as described later, when the water level in the water tank 10 is lowered to the predetermined water level WL2, the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed, and the flush water in the water accumulating portion 56 is lowered to lower the float 26. The washing water stored in water collector 56 is gradually discharged from discharge hole 56b, and the level of the washing water in water collector 56 is lowered. When the water level of the washing water in the water accumulating unit 56 is lowered to a predetermined water level WL4 (a water level at a height substantially equal to the predetermined water level WL 3) (in this case, the water level in the water tank 10 corresponds to the time of lowering to the predetermined water level WL 2), the positions of the transmission unit 48 and the float 26 are lowered. Thereby, the float is pressed, and the holding mechanism 46 shifts to the non-holding state. This allows the discharge valve 12 to be lowered to execute a small washing mode in which the second amount of washing water is discharged.

Further, for example, in the first embodiment described above, the water accumulation portion 56 is provided below the full water level WL, but as a modification, the water accumulation portion 56 and the float 26 in the water accumulation portion 56 may be provided above the full water level WL. According to such a water reservoir 56, the washing water is not stored in the water reservoir 56 in the standby state, and the washing water is supplied to the water reservoir 56 through the discharge unit 54, so that the float 26 rises and the transmission unit 48 rises. At this time, a seesaw-type force transmission device (transmission portion in a seesaw shape) having a shape in which the letter Z is inverted is provided instead of the holding mechanism 46. A rotation center shaft is provided at the center of the force transmission device, and when one end of the force transmission device is raised, the other end of the force transmission device is lowered like a seesaw, and an action portion provided at the other end acts on the clutch mechanism 30. One end of the force transmission means forms a transmission portion 48, and the other end of the force transmission means forms an action portion that acts on the clutch mechanism 30. Therefore, the operating portion can be lowered on the opposite side of the seesaw-shaped force transmission device by the rise of the float 26, and act on the clutch mechanism 30 to promptly interrupt the clutch mechanism 30. At this time, instead of the structure in which the discharge portion 54 is connected to the drive portion drain passage 34b, a structure in which the discharge portion 54 is connected to the water supply passage 50 is adopted. Thus, the controller 40 can supply the washing water to the water storage unit 56 at an arbitrary timing without passing through the drain valve hydraulic pressure driving unit 14.

When the large washing mode is selected, the controller 40 is configured not to discharge the washing water from the discharge portion 54 of the water supply path 50 to the water accumulating portion 56 and to lower the float device for the large washing mode through the action portion connected to the water accumulating portion 56 at least until the water level in the water tank 10 reaches the predetermined water level WL1 and the float device for the large washing mode is lowered according to the water level. Therefore, the drain valve 12 can be lowered at a timing corresponding to the original predetermined water level WL1, and the large flush mode can be executed.

When the small wash mode is selected, the controller 40 can supply wash water from the drain portion of the water supply path 50 to the sump portion 56 by opening the second control valve 22 at a predetermined timing, thereby raising the float 26 in the sump portion 56 and lowering the operation portion to promptly interrupt the clutch mechanism 30. The small washing mode in which the second washing water amount is discharged can be performed by lowering the drain valve 12 in advance by cutting off the clutch mechanism 30 in advance.

In the case of the structure in which the operating portion acts on the clutch mechanism 30 as in the above-described modification, the wash water tank device 4 may be provided with a float device for the large wash mode and a float device for the small wash mode, respectively, as a further modification. For example, the operating portion that operates on the clutch mechanism 30 may be a plate having a T-shaped tip end of a laterally extending rod, and the clutch mechanism 30 may be cut off by the plate.

In the wash water tank apparatus 4 having such a structure, the controller 40 is configured not to discharge wash water from the discharge portion 54 of the water supply path 50 to the water storage portion 56, not to raise the float 26 and the transmission portion 48, and not to cause the operation portion to prematurely interrupt the clutch mechanism 30, at least until the water level in the water tank 10 reaches the predetermined water level WL1 and the float device for the large wash mode is lowered according to the water level, when the large wash mode is selected. Therefore, the clutch mechanism 30 is cut off as intended, and the drain valve 12 is held by the holding mechanism 46 connected to the float device for the large flush mode. Thereafter, the drain valve 12 is lowered at a timing corresponding to the predetermined water level WL1 by the operation of the float device for the large flush mode, and the large flush mode can be executed.

When the small washing mode is selected, the controller 40 causes the washing water to be discharged from the discharge unit 54 to the water storage unit 56, and causes the float 26 and the transmission unit 48 to rise, thereby causing the operation unit to cut off the clutch mechanism 30 at an early stage. The float 26 in the water storage unit 56 can cause the rod of the operation unit to act laterally with the rise of the float 26, and the clutch mechanism 30 can be disengaged at a relatively early timing. By this configuration, the height at which the water discharge valve 12 rises (the height at which the clutch mechanism 30 is cut off) is adjusted to a lower position, and in the small flush mode, the clutch mechanism 30 is cut off at an early stage so that the water discharge valve 12 is held by the holding mechanism 46 connected to the float device for the small flush mode, thereby achieving the small flush mode.

As a further modification, instead of the structure in which the operating portion acts on the clutch mechanism 30 as in the above-described modification, a seesaw-type force transmission device as described above may be provided between the float 26 and the float device for the large washing mode. When the transmission part 48 at one end of the force transmission means is raised, the rod part at the other end of the force transmission means is lowered like a seesaw, and the rod part presses the float device for the large washing mode. With this configuration, the transmission section 48 can be raised by the rise of the float 26, the lever section of the action section on the opposite side to the seesaw-shaped force transmission device can be lowered, and the float device can be pressed down, so that the holding mechanism 46 extending from the float device for the large washing mode can be placed in a non-holding state.

With such a configuration, when the large washing mode is selected, the controller 40 prevents the washing water from being discharged from the discharge unit 54 to the water storage unit 56, prevents the float 26 and the transmission unit 48 from being raised, and prevents the lever unit from pressing the float device for the large washing mode. Therefore, the float device for the large flush mode can be operated at the predetermined water level WL1 at the initial timing, and the discharge valve 12 is lowered at a predetermined timing to execute the large flush mode.

When the small washing mode is selected, the controller 40 causes the washing water to be discharged from the discharge unit 54 to the water storage unit 56, causes the float 26 and the transmission unit 48 to rise, and causes the lever portion to press the float device for the large washing mode. The engagement between the drain valve 12 and the holding mechanism 46 of the float device for the large flush mode is released and the valve is lowered. Therefore, the holding claw of the drain valve 12 is held by the holding mechanism 46 of the float device for the small flush mode. Then, the float device for the small flush mode is lowered at a timing corresponding to the predetermined water level WL2, the holding mechanism 46 of the float device for the small flush mode is set to the non-holding state, the drain valve 12 is lowered, and the small flush mode for discharging the second flush water amount can be executed.

The above-described modifications are exemplified, but the structures of the modifications and the structure of the first embodiment may be arbitrarily combined or extracted and changed.

Next, a toilet apparatus according to a third embodiment of the present invention will be described with reference to the drawings.

The toilet water device 1 according to the third embodiment is different from the second embodiment described above in that the clutch mechanism 230 is disposed outside the discharge valve case 213. Here, only the points of the third embodiment of the present invention which are different from the second embodiment will be described, and the same portions are denoted by the same reference numerals in the drawings and the description thereof will be omitted. Fig. 25 is a sectional view showing a schematic configuration of a washing water tank device according to a third embodiment of the present invention.

As shown in fig. 25, a wash water tank device 204 according to a third embodiment of the present invention is provided in the toilet bowl device 1 (see fig. 1) in the same manner as the first embodiment of the present invention.

The water tank device 204 supplies the water toilet main body 2 with washing water. The wash tank unit 204 has a drain valve hydraulic drive unit 214 that drives the drain valve 12.

The flush water tank device 204 includes a clutch mechanism 230 for lowering the drain valve 12 when the valve is shut off, and the clutch mechanism 230 connects the drain valve 12 to the drain valve hydraulic drive unit 214, and lifts the drain valve 12 by the driving force of the drain valve hydraulic drive unit 214.

The drain valve 12 is lifted by the driving force of the drain valve hydraulic driving unit 214, the clutch mechanism 230 is cut off at a predetermined height or at a predetermined timing, and the drain valve 12 is lowered by its own weight. By controlling the predetermined time after the water discharge valve 12 is lifted up until the clutch mechanism 230 is turned off, the time until the water discharge valve 12 is lowered and the water discharge valve 12 is seated on the water discharge port 10a is adjusted. The drain valve 12 is disposed inside the drain valve housing 213. The drain valve case 213 is formed to cover the upper and outer peripheral sides of the drain valve 12. The drain valve case 213 is formed in a cylindrical shape covering the upper side of the drain valve 12. The drain valve case 213 is formed in the air from the water below the full water level WL of the washing water to the water above the full water level WL. The drain valve housing 213 is fixed at the base to the floor surface of the reservoir 10. The drain valve case 213 is not fixed to the drain valve hydraulic pressure driving unit 214, and is provided in the reservoir 10 separately from the drain valve hydraulic pressure driving unit 214.

The drain valve hydraulic pressure drive unit 214 is configured to drive the drain valve 12 by the supply water pressure of the washing water supplied from the water line. Specifically, the drain valve hydraulic pressure drive unit 214 includes: a cylinder 14a into which washing water supplied from the first control valve 16 flows; a piston 14b slidably disposed in the cylinder 14 a; and a rod 232 protruding from one end of the cylinder 14a to drive the discharge valve 12. The drain valve water pressure driving portion 214 is a horizontal type drain valve water pressure driving portion that laterally drives the piston 14b and the rod 232. The drain valve hydraulic pressure driving unit 214 is disposed so as to be separated from the drain valve case 213 outside the drain valve case 213, and the drain valve 12 is disposed inside the drain valve case 213.

A spring 14c is disposed inside the cylinder 14a, and biases the piston 14b laterally toward the first end portion 14g on the side of the discharge valve 12. Further, a seal 14e is fitted to the piston 14b to ensure water tightness between the inner wall surface of the cylinder 14a and the piston 14 b. A clutch mechanism 230 is provided at the other end of the rod 232, and the rod 232 is coupled to a coupling member 270 coupled to the valve shaft 12a of the water discharge valve 12 and the coupling of the rod 232 to the coupling member 270 is released by the clutch mechanism 230.

The cylinder 14a is a cylindrical member, the axis of which is arranged in a manner facing the lateral direction, for example, the horizontal direction, and accommodates the piston 14b slidably in the lateral direction inside. A drive unit water supply passage 34a is connected to the first end 14g of the cylinder 14a on the side of the discharge valve 12, and the wash water flowing out of the first control valve 16 flows into the cylinder 14 a. Therefore, the piston 14b in the cylinder 14a is laterally driven from the first end portion 14g toward the second end portion 14h against the urging force of the spring 14c by the washing water flowing into the cylinder 14 a.

On the other hand, an outflow hole is provided in an upper portion of the cylinder 14a, and the drive portion drain passage 34b communicates with the inside of the cylinder 14a via the outflow hole. Therefore, when the washing water flows into the cylinder 14a from the drive-portion water supply passage 34a connected to the cylinder 14a, the piston 14b is pushed from the first end portion 14g side portion of the cylinder 14a as the first position toward the second end portion 14 h. The piston 14b is driven by the pressure of the washing water flowing into the cylinder. When the piston 14b is pushed to a second position closer to the second end 14h side than the outlet hole, the water flowing into the cylinder 14a flows out from the outlet hole through the drive section drain passage 34 b. That is, when the piston 14b moves to the second position, the drive unit water supply passage 34a and the drive unit water discharge passage 34b communicate with each other via the inside of the cylinder 14 a. A discharge portion 54 is formed at the distal end portion of the drive portion drain passage 34b extending from the cylinder 14 a. In this way, the driving-unit water discharge passage 34b forms a flow path extending to the discharge unit 54.

The rod 232 is a rod-shaped member connected to the side surface of the piston 14b on the side of the discharge valve 12, and extends so as to protrude laterally from the cylinder 14a through hole 14f formed in the side surface of the cylinder 14 a. The rod 232 is connected to the piston 14b inside the cylinder 14a, and also connected to the clutch mechanism 230 outside the cylinder 14 a. Further, a gap 14d is provided between the rod 232 protruding from the side of the cylinder 14a and the inner wall of the through hole 14f of the cylinder 14a, and a part of the washing water flowing into the cylinder 14a flows out from the gap 14 d. The water flowing out of the gap 14d flows into the reservoir 10. Since the gap 14d is narrow and the flow path resistance is large, even in a state where water flows out from the gap 14d, the pressure in the cylinder 14a rises due to the washing water flowing into the cylinder 14a from the drive unit water supply path 34a, and the piston 14b is pushed toward the second end portion 14h against the biasing force of the spring 14 c.

The first control valve 16 is configured to control the supply of water to the drain valve hydraulic pressure driving unit 214 based on the operation of the electromagnetic valve 18, and to control the supply of water to the drain unit 54 and the stop of the supply of water to the drain unit 54. Therefore, the first control valve 16 is provided in a flow path for supplying washing water to the discharge unit 54 or the like as a valve control unit described later, and controls the supply of washing water to the discharge unit 54 or the like as a valve control unit. Therefore, the first control valve 16 supplies the washing water to the discharge portion 54 and the like via the drain valve hydraulic pressure driving portion 214.

The float switch 42 is disposed in the reservoir 10 and configured to stop the supply of water from the first control valve 16 to the drain valve hydraulic pressure driving portion 214 when the water level of the reservoir 10 rises to the full water level WL.

Next, the structure and operation of the clutch mechanism 230 will be described with reference to fig. 25 and the like.

The clutch mechanism 230 in the third embodiment has substantially the same configuration and operation principle as the clutch mechanism 130 in the second embodiment. The difference between the two is that: the clutch mechanism 230 in the third embodiment is a lateral clutch mechanism provided laterally at the end of the laterally extending rod 232, whereas the clutch mechanism 130 in the second embodiment is a longitudinal clutch mechanism provided longitudinally at the end of the longitudinally extending rod 32. The clutch mechanism 230 in the third embodiment has substantially the same structure as the clutch mechanism 130 in the second embodiment except that it is laterally assembled and laterally moved, and therefore, the common portions will not be described and the different portions will be mainly described.

First, as shown in fig. 25, the clutch mechanism 230 is provided at the end of the rod 232 extending laterally from the drain valve hydraulic drive unit 214, and is configured to connect the drain valve side end of the rod 232 to the upstream end of the connection member 270 and to release the connection between the drain valve side end of the rod 232 and the upstream end of the connection member 270. The clutch mechanism 230 moves in the lateral direction, and forms a lateral clutch mechanism, that is, a lever 232 is coupled to the clutch mechanism coupling portions 272 arranged in the lateral direction, and the lever 232 is decoupled from the clutch mechanism coupling portions 272. More specifically, the clutch mechanism 230 is formed to laterally separate the lever 232 from the clutch mechanism connecting portion 272 or to laterally engage the lever 232 with the clutch mechanism connecting portion 272 by movement of a hook member 130b, which will be described later. The clutch mechanism 230 is provided at substantially the same height as the lever 232. The clutch mechanism 230 has: a rotating shaft 130a fitted to the lower end of the rod 232; a hook member 130b supported by the rotation shaft 130 a; an engagement claw 30c, which will be described later, provided at the clutch mechanism side end of the clutch mechanism connecting portion 272; and a stopper 130f that defines an upper limit of the lifting position of the clutch mechanism 230. With such a configuration, the clutch mechanism 230 is cut off at a predetermined timing and at a predetermined lift height (lift height of the water discharge valve 12), and the water discharge valve 12 is lowered.

The hook member 130b is formed to extend upward in a splayed shape from the rotation shaft 130 a. In the hook member 130b, the drain valve water pressure driving portion side portion extending from the rotation shaft 130a to the drain valve water pressure driving portion side forms the drain valve water pressure driving portion side end portion 130e of the hook member 130b, and the drain valve water pressure driving portion side end portion 130e of the hook member 130b is formed in such a length and position that it does not come into contact with the bottom surface of the drain valve water pressure driving portion 214 even in a state where the piston 14b is most raised (pushed state). In the hook member 130b, the drain valve side portion extending from the rotary shaft 130a toward the drain valve side extends obliquely upward as a part in a shape of a letter "eight", and then forms the hook portion 130d of the hook member 130b that returns toward the clutch mechanism connecting portion 272. The engaging claw 30c is a plate-shaped claw. The bottom edge of the engaging claw 30c is formed to face the longitudinal direction. The baffle 130f is formed so that the baffle 130f abuts the bottom surface of the discharge valve water pressure driving portion 214 to stop the lifting of the discharge valve 12 and the like before the discharge valve water pressure driving portion side end portion 130e of the hook member 130b in the connected state comes into contact with the bottom surface of the discharge valve water pressure driving portion 214.

In the state shown in fig. 25, the drain valve 12 is seated on the drain opening 10a, and the drain opening 10a is closed. In this state, the discharge valve water pressure driving unit 214 is coupled to the discharge valve 12, and in this coupled state, the hook portion 130d of the hook member 130b is engaged with the bottom edge of the engaging claw 30c, and the discharge valve 12 can be lifted up by the lever 232. With such a configuration, for example, the clutch mechanism 230 functions as a timing control mechanism, and the timing at which the drain port is closed can be controlled by stopping the lowering of the drain valve 12 while the clutch mechanism 230 is engaged with the drain valve 12 via the connection member 270. For example, the clutch mechanism 230 and the action portion 258 described later may function as a timing control mechanism.

The clutch mechanism 230 is disposed between the drain valve hydraulic drive unit 214 and the drain valve housing 213 (or the drain valve 12) on the drain valve hydraulic drive unit 214 side. For example, the clutch mechanism 230 is disposed on the drain valve hydraulic drive unit 214 side of the position halfway in the length of the rod 232 and the coupling member 270 between the drain valve hydraulic drive unit 214 and the drain valve housing 213 (or the drain valve 12) in the standby state. The clutch mechanism 230 is disposed on the drain valve water pressure driving unit 214 side of the end of the flexible member 174 formed of the wire rod on the drain valve water pressure driving unit side. The clutch mechanism 230 is disposed on the drain valve water pressure driving unit 214 side of the end of the clutch mechanism connecting portion 272 on the drain valve water pressure driving unit side.

Since the clutch mechanism 230 is disposed at a position closer to the drain valve hydraulic drive unit 214 side than the position between the drain valve hydraulic drive unit 214 and the drain valve housing 213, the degree of freedom in setting the position at which the clutch mechanism 230 is disconnected, the degree of freedom in the position at which the clutch mechanism 230 is disposed, and the degree of freedom in the structure of the clutch mechanism 230 can be improved as compared with the case where the clutch mechanism is disposed at a position closer to the water surface than the position of the drain valve housing 213 side. Further, the degree of freedom of the arrangement position of the acting portion 258 and the like of the disconnecting/coupling mechanism 230 and the degree of freedom of the structure of the acting portion 258 and the like can be improved. The distance between the drain valve hydraulic pressure drive unit 214 and the clutch mechanism 230 in the standby state is set to be shorter than the distance between the drain valve case 213 (or the drain valve 12) and the clutch mechanism 230 in the standby state. The height difference between the drain valve hydraulic pressure driving unit 214 and the clutch mechanism 230 in the standby state is set smaller than the height difference between the drain valve housing 213 (or the drain valve 12) and the clutch mechanism 230 in the standby state.

The coupling member 270 couples the clutch mechanism 230 and the valve shaft 12 a. The connecting member 270 is longer than the rod 232. The connecting member 270 includes: a clutch mechanism connecting portion 272 connected to the clutch mechanism 230; and a flexible member 274 formed of a wire rod connecting the coupling mechanism connecting portion 272 and the valve shaft 12 a. The clutch mechanism connecting portion 272 extends along the same axis as the rod 232. The clutch mechanism connecting portion 272 is formed in a rod shape having rigidity. The clutch mechanism connecting portion 272 is formed with an engagement claw 30 c.

The flexible member 274 is disposed in a tube 276 extending from the drain valve housing 213. The flexible member 274 can deform along the shape of the tube 276. The flexible member 274 is configured to bend along the shape of the bent tube 276. When one end of the flexible member 274 moves by a certain amount of movement, the other end moves by the same certain amount of movement. In this way, the flexible member 274 transmits the lifting operation from the one end portion or the pulling-down operation from the other end portion as the lifting operation of the other end portion or the pulling-down operation of the one end portion. The flexible member 274 can be connected to the discharge valve hydraulic pressure driving unit 214 and the discharge valve 12 independently of the positions at which they are disposed, and can transmit a lifting operation or the like. This allows the drain valve hydraulic pressure driving unit 214 and the drain valve 12 to be disposed at more free positions. The flexible member 274 may be formed of other connecting members such as a chain, ball chain, or the like.

Referring back to fig. 25, the water reservoir and the like of the cleaning tank device 204 will be described.

The wash water tank device 204 further includes: a discharge unit 54 for discharging the supplied washing water; a water reservoir 156 for storing the washing water discharged from the discharge unit 54; a transfer unit 248 connected to the water accumulation unit 156; and an action part 258 connected to the transmission part 248 and moving longitudinally.

All or a part of the drain valve hydraulic pressure drive unit 214, the discharge unit 54, the water storage unit 156, the transmission unit 148, and the action unit 158 functions as a valve control unit. The valve control portion is formed so as to be able to cut off the clutch mechanism 230 at a predetermined timing. In this case, the clutch mechanism 230 can function as a timing control mechanism. The wash water tank device 204 includes such a valve control unit. When the first amount of washing water is selected by the remote control device 6 or the like, the valve control unit operates to block the clutch mechanism 230 after the first time elapses, and lowers the drain valve 12 after the first time elapses. When the second amount of wash water is selected by the remote control device 6 or the like, the valve control unit operates to shut off the clutch mechanism 230 when a second time shorter than the first time elapses, and lowers the drain valve 12 when the second time elapses. In this way, the valve control portion is configured to be operated by the supplied washing water.

The valve control unit is not limited to the water supply type valve control unit described above, i.e., the water storage unit 156 and the action unit 158 are driven by the washing water supplied to the water storage unit 156, and may be an electrically driven type valve control unit, i.e., the action unit 158 is driven by an electrically driven driving unit without the water storage unit 156, or may be a physical type valve control unit, i.e., the clutch mechanism is disengaged at a predetermined timing by biasing the action unit 158 in a direction to disengage the clutch mechanism by a physical structure such as a spring without using a unit such as an electric driving unit.

When the second amount of washing water is selected by the remote control device 6, the drain unit 54 drains the supplied washing water. The drain 54 is configured to drain the washing water even when the first amount of washing water is selected by the remote control device 6. The discharge portion 54 is formed at the lower end of the driving portion drain passage 34b, and extends downward. The discharge portion 54 is provided above the upper surface of the drain valve housing 213. The discharge portion 54 is disposed outside the water discharge valve case 213. The discharge portion 54 forms a discharge port having a narrow tip and directed downward. Therefore, the washing water is accelerated downward by gravity, and the flow path is narrowed at the discharge port, so that the flow velocity thereof is further accelerated. The discharge portion 54 is disposed inside the side wall of the water storage portion 156 and above the full water level WL.

The water reservoir 156 is disposed above the water discharge valve case 213. The discharge hole 56b is formed in the lower portion of the side wall of the water accumulation portion 156, and forms a small hole having a relatively small diameter.

The transmission portion 248 is formed as a rod-shaped member extending vertically downward from the lower surface of the water accumulation portion 156. The transmission portion 248 is fixed to the lower surface of the water storage portion 156. The transmission portion 248 is not fixed to the rod 232, and is disposed slidably with respect to the rod 232. A spring 249 is disposed outside the transmission portion 248, and the spring 249 is disposed between the water storage unit 156 and the discharge valve water pressure driving unit 214. Therefore, when the weight of water accumulating unit 156 is reduced after water accumulating unit 156 and transmission unit 248 are lowered, water accumulating unit 156 and transmission unit 248 are raised again by spring 249 and return to the standby position. The transmission portion 248 is coupled to the action portion 258. The transmission unit 248 can move up and down in the same manner in accordance with the up and down movement of the water storage unit 156, and the action unit 258 can move up and down. In this way, the transmission portion 248 and the action portion 258 move up and down along the imaginary line B2.

The action portion 258 is formed to be movable in the vertical direction at a position on the side of the first end portion 14g of the bottom surface of the drain valve hydraulic pressure driving portion 214 and on the upper side of the rod 232. In fig. 25, the position of the working portion 258 in the standby state is shown by a solid line, and the working portion 258 in a state of moving downward toward the lever 232 is shown by a phantom line B3. The acting portion 258 moves downward in such a manner as to advance toward the rod 232 when the transmitting portion 248 descends. The tip end 258a of the action portion 258 can be positioned in a space between the hook members 130b that are splayed in a state in which the hook members 130b are lifted most (state in which the hook members are advanced most toward the drain valve hydraulic drive portion 214). Further, the acting portion 258 moves upward so as to retreat in a direction away from the rod 232 when the transmission portion 248 ascends. The tip 258a of the action portion 258 is formed as a relatively large projection having a semicircular cross section. The action part 258 controls the timing of lowering the discharge valve 12 so that the timing at which the discharge port 10a is closed when the second amount of cleaning water is selected is earlier than the timing at which the first amount of cleaning water is selected, together with the operations of the transmission part 248 and the water storage part 156.

The acting portion 258 extends to the lever 232 side of the drain valve water pressure drive portion side end portion 130e of the hook member 130b in a state where the water storage portion 156 and the transmission portion 248 are lowered. If the action portion 258 is simply moved to the space between the splayed hook members 130b, the hook members 130b do not operate. When the supply of the washing water to the drain valve hydraulic pressure driving unit 214 is stopped and the piston 14b moves toward the drain valve, the drain valve hydraulic pressure driving unit side end portion 130e of the hook member 130b contacts the action portion 258 with the movement of the rod 232, and the hook member 130b rotates and the clutch mechanism 230 is disengaged.

A case where the physical valve control unit is configured instead of the water supply type valve control unit of the present embodiment will be described as a modification.

In this modification, the wash tank device 204 includes, in place of the drain portion 54 and the water accumulation portion 156 of the wash tank device 204: a spring type transmission part formed by a spring fixed in the water storage tank 10; and an action part which is connected with the spring type transmission part and moves longitudinally. At this time, all or a part of the drain valve hydraulic pressure driving portion 214, the spring type transmission portion, and the action portion functions as a valve control portion. The valve control portion is formed so as to be able to cut off the clutch mechanism 230 at a predetermined timing. In this case, the clutch mechanism 230 can function as a timing control mechanism.

The spring-type transmission portion in the above-described modification is disposed above the drain valve housing 213. Further, the spring-type transmitting portion 248 is disposed above the lever 232. The spring-loaded transmission portion 248 is fixed above the rod 232 and extends downward. The spring-type transmission portion is formed as a spring-like member extending vertically downward. The action part is fixed at the lower end of the spring type transmission part. The spring-type transmitting portion is not fixed to the rod 232, and is disposed slidably in the vertical direction with respect to the rod 232. When the hook member 130b of the clutch mechanism 230 acts on the inclined surface of the acting portion, which will be described later, from the drain valve side, the spring-type transmitting portion can receive a relatively large upward force from the inclined surface and expand and contract upward, thereby allowing the hook member 130b to escape without applying a relatively large load thereto. On the other hand, when the hook member 130b of the clutch mechanism 230 acts on a vertical surface of the acting portion 258, which will be described later, from the drain valve hydraulic pressure driving portion side, the spring-type transmission portion can receive a relatively large amount of lateral force from the vertical surface, and is less likely to expand and contract upward, and a relatively large load acts on the hook member 130b, thereby rotating the hook member 130b and disengaging the clutch mechanism 230. The spring-type transmission part returns to its natural length and returns to the standby position without receiving a force from the hook member 130 b.

The working portion in the above-described modification forms a structure having a substantially triangular lower portion in a side view. The action portion has a drain valve side surface formed as an inclined surface inclined from the upper portion to the lower portion toward the outer side toward the inner side, and a drain valve hydraulic drive portion side surface formed as a vertical surface extending in the vertical direction. The action portion is located at a height at which the spring-type transmission portion can act on the hook member 130b in a standby state of a natural length. The action portion is formed to be movable in the vertical direction by the spring-loaded transmission portion at a position lateral to the first end portion 14g of the bottom surface of the drain valve hydraulic pressure driving portion 214 and above the lever 232. The acting portion moves upward away from the rod 232 when the spring-loaded transmission portion contracts. The distal end portion of the action portion can be positioned in a space between the hook members 130b that are splayed in a state where the hook members 130b are advanced most and the hook members 130b are lifted most (state where the hook members are advanced most toward the drain valve hydraulic drive portion 214). The tip end portion of the action portion is formed with a vertical surface and an inclined surface as a downward projecting portion. The action portion controls the timing of lowering the discharge valve 12 so that the timing at which the discharge port 10a is closed when the second amount of cleaning water is selected is earlier than the timing at which the first amount of cleaning water is selected, together with the operations of the discharge valve hydraulic pressure driving portion 214, the transmission portion, and the like.

The action portion in the above-described modification extends to the side closer to the rod 232 than the drain valve water pressure driving portion side end portion 130e of the hook member 130b in the standby state where the spring transmission portion is returned to the natural length after the hook member 130b temporarily pushes up the inclined surface of the action portion and moves forward to the drain valve water pressure driving portion 214 side. If the action part is simply moved to the space between the splayed hook members 130b, the hook members 130b do not work. When the supply of the washing water to the drain valve hydraulic drive unit 214 is stopped and the piston 14b moves toward the drain valve, the drain valve hydraulic drive unit side end 130e of the hook member 130b contacts the vertical surface of the action portion with the movement of the rod 232, and the hook member 130b rotates and the clutch mechanism 230 is disengaged.

Next, the operation of the wash water tank device 204 according to the third embodiment of the present invention and the water closet system 1 including the wash water tank device 204 will be described with reference to fig. 25.

The clutch mechanism 230 in the third embodiment has substantially the same configuration and operation principle as the clutch mechanism 130 in the second embodiment. The operation of the acting portion 258 relative to the clutch mechanism 230 in the third embodiment is substantially the same as the operation of the acting portion 158 relative to the clutch mechanism 130 in the second embodiment. Therefore, the operation of the acting portion 258 with respect to the clutch mechanism 230 in the third embodiment is also described with reference to the operation of the acting portion 158 with respect to the clutch mechanism 130 in the second embodiment and fig. 17 to 24, and the like, and common description and illustration are omitted.

First, in the standby state of toilet cleaning shown in fig. 25, the water level in the reservoir tank 10 is at the predetermined full water level WL, and in this state, both the first control valve 16 and the second control valve 22 are closed. The water storage unit 156 does not store the washing water, and the water storage unit 156 and the transmission unit 248 are biased upward by a spring 249. The acting portion 258 is pulled by the transmitting portion 248 to be located at a position retreated from the rod 232. Next, when the user presses the large washing button of the remote control device 6, the remote control device 6 transmits an instruction signal for executing the large washing mode to the controller 40. Further, when the small wash button is pressed, an instruction signal for executing the small wash mode is transmitted to the controller 40.

Next, the operation of the large cleaning mode will be described with reference to fig. 25.

When receiving the instruction signal to perform the large purge, the controller 40 operates the solenoid valve 18 included in the first control valve 16 to unseat the solenoid-valve-side pilot valve 16d from the pilot valve port. When the first control valve 16 is opened, the washing water flowing in from the water supply pipe 38 is supplied to the drain valve hydraulic pressure driving part 214 via the first control valve 16. Thereby, the piston 14b of the discharge valve hydraulic pressure driving unit 214 is pushed forward, the discharge valve 12 is lifted up via the rod 232, and the flush water in the reservoir tank 10 is discharged from the discharge port 10a to the toilet main body 2. At this time, the pilot valve 16d is still in the open state, and the washing water flowing from the water supply pipe 38 is continuously supplied to the drain valve water pressure driving part 214 via the first control valve 16. When the piston 14b moves to the second position (the state where it is pushed most toward the second end 14h side), the drive unit water supply passage 34a and the drive unit water discharge passage 34b communicate with each other through the inside of the cylinder 14a, and therefore the washing water is discharged from the discharge unit 54 to the water storage unit 156. Therefore, after the drain valve hydraulic pressure driving unit 214 raises the drain valve 12, the supply of the washing water from the first control valve 16 to the water storage unit 156 is started. Even in a state where the rod 232 moves toward the drain valve water pressure driving portion side due to the movement of the piston 14b and the rod 232 and the stopper 130f abuts against the bottom surface of the drain valve water pressure driving portion 214, the drain valve water pressure driving portion side end portion 130e of the hook member 130b of the clutch mechanism 230 does not abut against the bottom surface of the drain valve water pressure driving portion 214. Thus, the clutch mechanism 230 remains connected. Therefore, the drain valve 12 is kept in a lifted state. On the other hand, when the supply of the washing water to water storage unit 156 is started, water storage unit 156 and transmission unit 248 gradually descend, and thus action unit 258 starts descending and moving between hook members 130b on the rod 232 side. The controller 40 keeps the second control valve 22 closed.

As shown in fig. 18, 25, and the like, the supply of the washing water to the drain valve hydraulic pressure driving part 214 via the first control valve 16 is continued. The piston 14b of the drain valve hydraulic drive unit 214 is pushed up most (pushed in state), and the rod 232 and the clutch mechanism 230 are also pulled up most. Since the piston 14b is at the second position (the most pushed-up state), the drain valve hydraulic pressure driving unit 214 supplies the drain unit 54 with the washing water. When the water level of the washing water in water storage unit 156 becomes substantially the full water level in water storage unit 156, water storage unit 156 and transfer unit 248 are lowered by the weight of the washing water. The operation portion 158 descends toward the rod 232 side due to the descent of the transmission portion 248. The tip end 258a of the acting portion 258 is located in a space between the hook members 130b that are stationary in the most lifted state. The drain valve hydraulic drive portion side end 130e of the hook member 130b is positioned above the tip end 258a and is separated from the tip end 258 a. Therefore, the clutch mechanism 230 is not yet disengaged, and continues to be in the holding state.

Next, as shown in fig. 19, 25, and the like, when the water level in the water reservoir 10 decreases, the float switch 42 that detects the water level in the water reservoir 10 is turned off. When the float switch 42 is off, the pilot valve 22c provided in the second control valve 22 is opened. Therefore, the washing water is supplied from the second control valve 22 into the water tank 10 through the water supply path 50. When the pilot valve 22c is opened, the controller 40 keeps the pilot valve 16d on the solenoid valve 18 side in the opened state when the large purge mode is selected by the controller 40. The washing water flowing in from the water supply pipe 38 is still discharged from the discharge unit 54 to the water storage unit 156 via the first control valve 16 and the drain valve hydraulic drive unit 14. Therefore, the amount of washing water in water accumulating portion 156 is maintained at substantially the full water level of water accumulating portion 156 without decreasing. Therefore, the water storage unit 156 and the transmission unit 248 are in a lowered state, and the tip 258a of the action unit 258 is positioned in the space between the hook members 130 b.

Next, as shown in fig. 20, 25, and the like, when the large cleaning mode is selected, the controller 40 closes the electromagnetic valve 18 and closes the first control valve 16 after a first time has elapsed from when the controller 40 opens the electromagnetic valve 18 (starts cleaning). The timing (the first elapsed time) at which the controller 40 closes the electromagnetic valve 18 is set in consideration of the following timings: as described later, when the water level in the water tank 10 is lowered to the predetermined water level WL1, the discharge valve 12 is seated on the discharge port 10a, and the discharge port 10a is closed, and the piston 14b starts to descend, and the clutch mechanism 230 is turned off. The first control valve 16 is closed, and thus the supply of the washing water to the drain valve hydraulic pressure driving part 214 and the drain part 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water accumulating portion 156 until the water accumulating portion 156 is almost full of water, and the water accumulating portion 156 is lowered by the weight of the washing water. Therefore, the tip end portion 258a of the acting portion 258 is located and stopped in the space between the hook members 130 b.

Further, since the supply of the washing water to the drain valve hydraulic pressure driving unit 214 is stopped, the washing water in the cylinder 14a gradually flows out from the gap 14d, the piston 14b is pressed by the biasing force of the spring 14c, and the rod 232 moves to the right on the paper surface and moves to the drain valve side. Thereby, the drain valve water pressure driving portion side end portion 130e of the hook member 130b abuts on the tip end portion 258a, and the drain valve water pressure driving portion side end portion 130e rotates counterclockwise about the rotation shaft 130 a. Along with this rotation, the lower portion of the hook member 130b and the hook 130d are rotated so as to be lifted (see fig. 20). Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 230 is turned off, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water reservoir 10 through the water supply path 50 is continued.

As shown in fig. 21, 25, and the like, the descending drain valve 12 is seated on the drain opening 10a, and the drain opening 10a is closed. In this way, when the large flush mode is executed, the first flush water amount is discharged to the toilet main body 2 by holding the discharge valve 12 until the water level in the reservoir 10 decreases from the full water level WL to the predetermined water level WL 1. Then, the washing water stored in water storage unit 156 is gradually discharged from discharge hole 56b, and the water level of the washing water in water storage unit 156 is lowered. When the washing water in water accumulating unit 156 is drained or reduced, water accumulating unit 156 and transfer unit 248 are raised again by spring 249 and returned to the standby position. Therefore, the acting portion 258 also retreats in a direction away from the rod 232 in accordance with the rise of the transmission portion 248. The piston 14b further moves back toward the drain valve side as the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 flows out.

Since the float switch 42 is still in the off state, the water is continuously supplied to the reservoir 10 while the second control valve 22 is kept in the open state. The washing water supplied through the water supply path 50 reaches the water supply path branch portion 50a, and a part of the washing water branched at the water supply path branch portion 50a flows into the overflow pipe 10b, and the remainder is stored in the water tank 10. In a state where the drain valve 12 is closed, the washing water flows into the reservoir 10, and the water level in the reservoir 10 rises.

As shown in fig. 22, 25, and the like, when the water level in the water tank 10 rises to the predetermined full water level WL, the float switch 42 is turned on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side closes. As a result, the pilot valve 22c is in a closed state, and therefore, the pressure in the pressure chamber 22b increases, the main valve body 22a of the second control valve 22 is closed, and the water supply is stopped.

Then, the washing water in the cylinder 14a of the drain valve hydraulic pressure driving unit 14 gradually flows out from the gap 14d, and the piston 14b is pressed by the biasing force of the spring 14c, and the rod 232 moves toward the drain valve side in accordance with this. When the hook 130d is lowered to the position of the engagement claw 30c, it descends along the inclined surface of the engagement claw 30c, and when it passes over the engagement claw 30c, it is rotated to the original position by gravity, the hook 130d and the engagement claw 30c are engaged again, the clutch mechanism 230 is connected, and the lever 232 and the valve shaft 12a are connected. Therefore, the toilet returns to the standby state before the toilet bowl cleaning is started.

Next, the operation of the small purge mode will be described with reference to fig. 17 to 19, 22, 23, 24, and 25.

As shown in fig. 25, the standby state of toilet flushing is the same as the large flush mode.

When receiving the instruction signal to perform the small purge, the controller 40 operates the electromagnetic valve 18 included in the first control valve 16 to open the first control valve 16. Thereafter, as shown in fig. 17 to 19, 25, and the like, the water accumulation portion 156 and the transmission portion 248 are lowered, and the operation until the tip end portion 258a of the action portion 258 is positioned in the space between the hook members 130b is the same as in the large cleaning mode. Therefore, the operation in the small cleaning mode up to this point will be described with reference to fig. 17 to 19, fig. 25, and the like, and the operation in the large cleaning mode, and the description thereof will be omitted.

Next, as shown in fig. 23, 25, and the like, when the small purge mode is selected, the controller 40 closes the electromagnetic valve 18 and closes the first control valve 16 after a second time elapses from when the controller 40 opens the electromagnetic valve 18 (starts purging). The second time is set to a time shorter than the first time. The timing (the second elapsed time) at which the controller 40 closes the electromagnetic valve 18 is set in consideration of the following timings: as described later, when the water level in the water tank 10 is lowered to the predetermined water level WL2, the discharge valve 12 is seated on the discharge port 10a, and the discharge port 10a is closed, and the piston 14b starts to descend, and the clutch mechanism 230 is turned off. The first control valve 16 is closed, and thus the supply of the washing water to the drain valve hydraulic pressure driving part 214 and the drain part 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water accumulating portion 156 until the water accumulating portion 156 is almost full of water, and the water accumulating portion 156 is lowered by the weight of the washing water. Therefore, the tip end portion 258a of the acting portion 258 is located and stopped in the space between the hook members 130 b.

Since the supply of the washing water to the drain valve hydraulic pressure driving unit 214 is stopped, the washing water in the cylinder 14a gradually flows out from the gap 14d, and the piston 14b is pressed by the biasing force of the spring 14c, and the rod 232 moves toward the drain valve side in accordance with the pressing. Thereby, the drain valve water pressure driving portion side end portion 130e of the hook member 130b abuts on the tip end portion 258a, and the drain valve water pressure driving portion side end portion 130e rotates counterclockwise about the rotation shaft 130 a. Along with this rotation, the lower portion of the hook member 130b and the hook 130d rotate in a manner to be lifted. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 230 is turned off, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water reservoir 10 through the water supply path 50 is continued.

As shown in fig. 24, 25, and the like, the descending drain valve 12 is seated on the drain opening 10a, and the drain opening 10a is closed. In this way, when the small flush mode is executed, the second flush water amount smaller than the first flush water amount is discharged to the toilet main body 2 while the drain valve 12 is held until the water level in the reservoir 10 decreases from the full water level WL to the predetermined water level WL 2. Then, the washing water stored in water storage unit 156 is gradually discharged from discharge hole 56b, and the water level of the washing water in water storage unit 156 is lowered. When the washing water in water accumulating unit 156 is drained or reduced, water accumulating unit 156 and transfer unit 248 are raised again by spring 249 and returned to the standby position. Therefore, the acting portion 258 also retreats in a direction away from the rod 232 in accordance with the rise of the transmission portion 248. The piston 14b is further lowered as the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 flows out.

The third embodiment has been described above as an example, but all or part of the structure of the first embodiment, the structure of the second embodiment, the structure of the third embodiment, and the structures of the modifications may be arbitrarily combined or extracted and changed.

According to the wash water tank apparatus 204 of the third embodiment of the present invention, the discharge valve water pressure driving unit 214 is disposed to be separated from the discharge valve case 213 outside the discharge valve case 213, the discharge valve 12 is disposed inside the discharge valve case 213, and the clutch mechanism 230 is disposed on the discharge valve water pressure driving unit side between the discharge valve water pressure driving unit 214 and the discharge valve case 213. Thus, the clutch mechanism 230 can be disposed between the drain valve casing 213 and the drain valve hydraulic drive unit 214 on the drain valve hydraulic drive unit side, and the degree of freedom in setting the position of the disconnection clutch mechanism 230 and the degree of freedom in the position where the clutch mechanism 230 is disposed can be increased.

Description of reference numerals:

1: a water closet device; 2: washing the toilet main body; 4: cleaning the water tank device; 6: a remote control device; 10: a water storage tank; 10 a: a water outlet; 12: a drain valve; 14: a drain valve water pressure driving part; 18: an electromagnetic valve; 24: an electromagnetic valve; 26: a float; 26 a: a float; 30: a clutch mechanism; 46: a holding mechanism; 48: a transmission section; 54: a discharge unit; 56: a water accumulation part; 56 b: a discharge hole; 104: cleaning the water tank device; 130: a clutch mechanism; 148: a transmission section; 156: a water storage part.

Claims

1. A wash water tank device for supplying wash water to a water closet, comprising:

a water storage tank for storing the washing water to be supplied to the toilet bowl and having a water outlet for discharging the stored washing water to the toilet bowl;

a drain valve that opens and closes the drain port, supplies the flush water to the flush toilet, and stops the supply of the flush water to the flush toilet;

a drain valve hydraulic pressure drive unit that drives the drain valve by using a supply pressure of supplied tap water;

a clutch mechanism that connects the drain valve to the drain valve hydraulic drive unit, lifts the drain valve by a driving force of the drain valve hydraulic drive unit, and cuts off the drain valve at a predetermined timing to lower the drain valve;

a washing water amount selection unit capable of selecting a first washing water amount for washing the toilet and a second washing water amount smaller than the first washing water amount;

a timing control mechanism for stopping the lowering of the drain valve while the drain valve is engaged with the drain valve, and controlling a timing at which the drain port is closed; and

a valve control part connected with the timing control mechanism and configured to operate at a timing corresponding to the washing water amount selected by the washing water amount selection part,

wherein the timing control means is engaged with the drain valve when the first amount of washing water is selected by the washing water amount selection unit, the valve control unit operates the timing control means to release the engagement between the timing control means and the drain valve when a first time elapses, and lowers the drain valve when the first time elapses,

when the second amount of washing water is selected by the washing water amount selection unit, the timing control unit engages with the drain valve, and the valve control unit operates the timing control unit to release the engagement between the timing control unit and the drain valve when a second time shorter than the first time elapses, and lowers the drain valve when the second time elapses.

2. A wash water tank device for supplying wash water to a water closet, comprising:

a clutch mechanism that connects the drain valve to the drain valve hydraulic drive unit, lifts up the drain valve by a driving force of the drain valve hydraulic drive unit, and lowers the drain valve by being turned off;

a washing water amount selection unit capable of selecting a first washing water amount for washing the toilet and a second washing water amount smaller than the first washing water amount; and

a valve control unit configured to be capable of shutting off the clutch mechanism at a predetermined timing, wherein the valve control unit operates to shut off the clutch mechanism when a first time elapses and to lower the drain valve when the first washing water amount is selected by the washing water amount selection unit,

when the second washing water amount is selected by the washing water amount selection unit, the valve control unit operates to shut off the clutch mechanism when a second time shorter than the first time elapses, and lowers the drain valve when the second time elapses.

3. The wash tank device according to claim 1 or 2, further comprising:

a control valve provided in a flow path for supplying washing water to the valve control unit, and controlling the supply of washing water to the valve control unit; and

a control unit for controlling the control valve,

the valve control portion is configured to be operated by the supplied washing water.

4. The wash water tank apparatus according to claim 3,

after the drain valve hydraulic pressure driving unit raises the drain valve, the supply of the washing water from the control valve to the valve control unit is started.

5. The wash water tank device according to claim 3 or 4,

the control valve is also configured to control the supply of the washing water to the drain valve hydraulic pressure driving part.

6. The wash water tank device according to any one of claims 3 to 5,

the control valve supplies washing water to the valve control part via the drain valve hydraulic pressure driving part.

7. The wash water tank device according to claim 1, wherein the valve control unit includes:

a water storage unit for storing washing water, wherein a discharge hole for discharging the stored washing water is formed at a lower portion of the water storage unit;

a discharging unit for discharging the washing water to the water storage unit; and

a float provided in the water reservoir and moving up and down according to a water level in the water reservoir,

the timing control mechanism includes an engaging portion engageable with the drain valve in accordance with a position of the float,

the timing control means is configured to arrange the engagement portion at a position where the engagement portion can engage with the drain valve when the float is raised due to the accumulation of the washing water in the water accumulation portion,

when the float descends, the timing control mechanism moves the engagement portion to a position where the engagement with the drain valve is released.

8. The wash water tank apparatus according to claim 7,

after the clutch mechanism is cut off, the supply of the washing water from the control valve to the valve control unit is started.

9. The wash water tank device according to any one of claims 1 to 8,

the drain valve hydraulic drive unit is disposed so as to be separated from the drain valve housing on the outside of the drain valve housing, the drain valve is disposed inside the drain valve housing, and the clutch mechanism is disposed on the side of the drain valve hydraulic drive unit between the drain valve hydraulic drive unit and the drain valve housing.

10. The wash water tank device according to claim 1, wherein the valve control unit includes:

a discharge unit configured to discharge the supplied washing water when the second washing water amount is selected by the washing water amount selection unit;

a water storage unit for storing the washing water discharged from the discharge unit; and

the timing control mechanism is coupled to the float, and operates in accordance with the vertical movement of the float, and controls the timing of lowering the drain valve so that the timing at which the drain port is closed when the second amount of wash water is selected is earlier than the timing at which the first amount of wash water is selected.

11. The wash tank device according to claim 10,

the drain valve hydraulic pressure drive unit includes: a cylinder into which the supplied washing water flows; a piston slidably disposed in the cylinder and driven by the pressure of the washing water flowing into the cylinder; and a rod connected with the piston to drive the drain valve,

the volume of wash water that can be stored between the water storage unit and the float in the water storage unit is smaller than the volume of the cylinder.

12. The wash water tank device according to claim 10 or 11,

the discharge portion forms a downward discharge port.

13. The wash water tank device according to any one of claims 10 to 12,

at least a part of the water storage part is positioned below a water stop level of the water storage tank.

14. The wash water tank device according to any one of claims 10 to 13,

the water storage unit is provided with a discharge hole for discharging the stored washing water.

15. The wash water tank apparatus according to claim 14,

the discharge hole of the water reservoir is formed in a lower portion of a side wall of the water reservoir, and is formed as an opening facing the opposite side to the drain valve in a plan view.

16. The wash water tank device according to claim 14 or 15,

an instantaneous flow rate of the washing water discharged from the discharge hole is smaller than an instantaneous flow rate of the washing water discharged from the discharge portion.

17. A water closet device is characterized by comprising:

the wash water tank arrangement of any one of claims 1 to 16; and

the flush toilet is flushed by flush water supplied from the flush water tank device.