CN113574229B

CN113574229B - Flush tank device and flush toilet device provided with same

Info

Publication number: CN113574229B
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: 2023-09-01
Anticipated expiration: 2041-02-05
Also published as: CN113574229A

Abstract

The invention provides a flush water tank device capable of precisely setting the amount of flush water to be discharged while opening a drain valve by a drain valve water pressure driving unit, and a flush toilet device provided with the flush water tank device. The present invention is a cleaning water tank device, comprising: a drain valve water pressure driving unit (14); a clutch mechanism (30); a cleaning water amount selection unit (6); a timing control mechanism (46); and a valve control unit that, when the first amount of cleaning water is selected, engages the timing control mechanism with the drain valve, 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 a first time elapses, and when the second amount of cleaning water is selected, engages the timing control mechanism with the drain valve, wherein the valve control unit 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 a second time shorter than the first time elapses.

Description

Flush tank device and flush 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 that supplies flush water to a toilet bowl, and a toilet bowl device provided with the flush water tank device.

Background

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

When the drain valve is closed, the electromagnetic valve is closed to stop the supply of water to the hydraulic cylinder device. Accordingly, the pushed-up piston descends, and the drain valve returns to the valve-closing position due to its own weight. At this time, the water in the hydraulic cylinder device flows out from the drain portion little by little, and therefore the piston gradually descends, and the drain valve also gradually returns to the valve-closing position. In the low-level cistern device described in patent document 1, the time for opening the solenoid valve is adjusted to change the time for opening the drain valve, thereby realizing cleaning with different amounts of cleaning water, such as large cleaning and small cleaning.

Prior art literature

Patent literature

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

Disclosure of Invention

Problems to be solved by the invention

However, in the low-level tank device described in patent document 1, there is a problem in that it is difficult to precisely set the amount of the cleaning water to be discharged. That is, in the low-level tank device described in patent document 1, since the water in the hydraulic cylinder device flows out from the drain portion little by little after the electromagnetic valve is closed in order 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 to be short. Further, since the lowering speed of the piston depends on the flow rate of water flowing out from the water discharge portion and the sliding resistance of the piston, there is a possibility that the lowering speed may vary or may vary with time. Therefore, in the low-level tank device described in patent document 1, it is difficult to precisely set the amount of the cleaning water to be discharged.

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

Solution for solving the problem

In order to solve the above-described problems, an embodiment of the present invention is a flush tank device for supplying flush water to a flush toilet, comprising: a water storage tank that stores washing water to be supplied to the toilet bowl, and that has a drain port for draining the stored washing water to the toilet bowl; a drain valve that opens and closes the drain port, and that supplies the washing water to the toilet bowl, and that stops the supply of the washing water to the toilet bowl; a drain valve water pressure driving unit for driving the drain valve by using the water supply pressure of the supplied tap water; a clutch mechanism that connects the drain valve to the drain valve water pressure driving unit, lifts the drain valve by a driving force of the drain valve water pressure driving unit, and cuts off the clutch mechanism at a predetermined timing to lower the drain valve; a flush water amount selection unit configured to select a first flush water amount for cleaning the toilet bowl and a second flush water amount smaller than the first flush water amount; a timing control mechanism for stopping the lowering of the drain valve while engaged with the drain valve, and controlling the timing at which the drain port is closed; and a valve control unit connected to the timing control unit, the valve control unit being configured to operate at a timing corresponding to the amount of the washing water selected by the washing water amount selection unit, the timing control unit being engaged with the drain valve when the first amount of the washing water is selected by the washing water amount selection unit, the valve control unit being configured to operate the timing control unit to release the engagement between the timing control unit and the drain valve when a first time elapses, the drain valve being configured to be lowered when the first time elapses, the timing control unit being configured to engage with the drain valve when the second amount of the washing water is selected by the washing water amount selection unit, the valve control unit being configured to operate 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 the valve control unit being configured to be lowered when the second time elapses.

According to an embodiment of the present invention thus constituted, the drain valve and the drain valve water pressure driving portion are coupled by the clutch mechanism which is cut off at a predetermined timing, and therefore the drain valve can be moved and closed irrespective of the operation speed of the drain valve water pressure driving portion. Thus, even if there is a deviation in the operating speed of the drain valve water pressure driving unit when the drain valve is lowered, the timing of closing the drain valve can be controlled so as not to be affected by the deviation. Further, when the first amount of washing water is selected by the washing water amount selection unit, the timing control mechanism is engaged with the drain valve, the valve control unit operates the timing control mechanism so as to release the engagement between the timing control mechanism and the drain valve when a first time elapses, and when the second amount of washing water is selected by the washing water amount selection unit, the timing control mechanism is engaged with the drain valve, and the valve control unit operates the timing control mechanism so as to release the engagement between the timing control mechanism and the drain valve when a second time shorter than the first time elapses. In this way, when the second amount of the washing water is selected by the washing water amount selecting unit, the valve control unit can operate the timing control mechanism so that the timing at which the drain port is closed is earlier than when the first amount of the washing 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 while using the clutch mechanism.

In one embodiment of the present invention, a flush tank device for supplying flush water to a toilet is preferably provided with: a water storage tank that stores washing water to be supplied to the toilet bowl, and that has a drain port for draining the stored washing water to the toilet bowl; a drain valve that opens and closes the drain port, and that supplies the washing water to the toilet bowl, and that stops the supply of the washing water to the toilet bowl; a drain valve water pressure driving unit for driving the drain valve by using the water supply pressure of the supplied tap water; a clutch mechanism that connects the drain valve to the drain valve water pressure driving unit, lifts the drain valve by a driving force of the drain valve water pressure driving unit, and is cut off, thereby lowering the drain valve; a flush water amount selection unit configured to select a first flush water amount for cleaning the toilet bowl and a second flush water amount smaller than the first flush water amount; and a valve control unit configured to be able to switch off the clutch mechanism at a predetermined timing, wherein the valve control unit operates to switch off the clutch mechanism when a first time elapses, and to lower the drain valve when the first time elapses, and operates to switch off the clutch mechanism when a second time shorter than the first time elapses, and to lower the drain valve when the second time elapses, when the second water amount is selected by the water amount selection unit.

According to an embodiment of the present invention thus constituted, the drain valve and the drain valve water pressure driving portion are coupled by the clutch mechanism which is cut off at a predetermined timing, and therefore the drain valve can be moved and closed irrespective of the operation speed of the drain valve water pressure driving portion. Further, when the first amount of the washing water is selected by the washing water amount selecting unit, the valve control unit operates to cut off the clutch mechanism when a first time elapses, and the drain valve is lowered when the first time elapses, and when the second amount of the washing water is selected by the washing water amount selecting unit, the valve control unit operates to cut off the clutch mechanism when a second time shorter than the first time elapses, and the drain valve is lowered when the second time elapses. In this way, when the second amount of the washing water is selected by the washing water amount selecting unit, the valve control unit can switch off the clutch mechanism at a timing earlier than when the first amount of the washing water is selected. Therefore, according to an embodiment of the present invention, the first and second amounts of cleaning water can be set by lowering the drain valve by the lapse of a predetermined time while using the clutch mechanism.

In one embodiment of the present invention, it is preferable that the method further comprises: a control valve provided in a flow path for supplying the washing water to the valve control unit, the control valve controlling the supply of the washing water to the valve control unit; and a control unit configured to control the control valve, the valve control unit being configured to operate by the supplied washing water.

According to an embodiment of the present invention thus constituted, the control unit controls the control valve, and the valve control unit operates with the washing water supplied from the control valve. Accordingly, the first and second amounts of cleaning water can be set by lowering the drain valve by the lapse of a predetermined time while 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 is lifted by the drain valve water pressure driving unit.

According to an embodiment of the present invention thus constituted, the first and second amounts of wash water can be set by lowering the drain valve by a predetermined time period while using the clutch mechanism with a relatively compact and simple configuration so as not to hinder the operation of the drain valve water pressure driving unit to raise the drain valve by the wash water.

In one embodiment of the present invention, the control valve is preferably configured to control the supply of the washing water to the drain valve hydraulic driving unit.

According to an embodiment of the present invention configured as described above, the control valve is configured to control the supply of the washing water to the water pressure driving portion of the drain valve, so that the first washing water amount and the second washing water amount can be set by lowering the drain valve by a predetermined time period while using the clutch mechanism with a relatively compact and simple configuration.

In one embodiment of the present invention, the control valve preferably supplies the 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, the generation of relatively wasteful washing water that does not contribute to any operation of the drain valve water pressure driving section and the valve control section can be suppressed in the washing water supplied from the control valve by the relatively compact and simple constitution, and the washing water can be effectively used in the drain valve water pressure driving section and the valve control section.

In one embodiment of the present invention, the valve control unit preferably includes: a water accumulation part for accumulating the cleaning water, wherein a discharge hole for discharging the accumulated cleaning water is formed at the lower part of the water accumulation part; a drain unit that drains the washing water to the water accumulation unit; and a float provided in the water accumulation portion and moving up and down according to a water level in the water accumulation portion, wherein the timing control mechanism includes an engagement portion engageable with the drain valve according to a position of the float, and the timing control mechanism is configured to dispose the engagement portion at a position engageable with the drain valve when the float is raised due to the accumulation of the cleaning water in the water accumulation portion, and to move the engagement portion to a position to release the engagement with the drain valve when the float is lowered.

According to an embodiment of the present invention configured as described above, the timing control means is configured to position the engagement portion so as to be engageable with the drain valve when the float is raised while the water reservoir is storing the washing water, and to move the engagement portion to a position to release the engagement with the drain valve when the float is lowered. By using the water accumulation portion and the float provided in the water accumulation portion in this manner, the influence of the deviation in the flow rate of the washing water supplied to the water accumulation portion can be suppressed, and the operation of the timing control mechanism can be made relatively stable by a relatively simple configuration. Therefore, according to an embodiment of the present invention, the first and second amounts of cleaning 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, the drain valve water pressure driving unit is preferably disposed so as to be separated from the drain valve housing on the outside of the drain valve housing, the drain valve is preferably disposed on the inside of the drain valve housing, and the clutch mechanism is preferably disposed between the drain valve water pressure driving unit and the drain valve housing on the drain valve water pressure driving unit side.

According to an embodiment of the present invention thus constituted, the drain valve water pressure driving section is disposed apart from the drain valve housing on the outside of the drain valve housing, the drain valve is disposed on the inside of the drain valve housing, and the clutch mechanism is disposed between the drain valve water pressure driving section and the drain valve housing on the drain valve water pressure driving section side. Thus, the clutch mechanism can be disposed between the drain valve housing and the drain valve water pressure driving unit at a position closer to the drain valve water pressure driving unit, and the degree of freedom in setting the position for shutting off the clutch mechanism and the degree of freedom in the arrangement position of the clutch mechanism can be improved.

An embodiment of the present invention is characterized in that the valve control unit includes: a discharge unit that discharges the supplied cleaning water when the second cleaning water amount is selected by the cleaning water amount selection unit; a water accumulation unit for accumulating the washing water discharged from the discharge unit; and a float provided in the water accumulation portion and moving up and down according to a water level in the water accumulation portion, wherein the timing control means 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 of closing the drain port when the second amount of the cleaning water is selected is earlier than a timing of closing the drain port when the first amount of the cleaning water is selected.

According to an embodiment of the present invention thus constituted, the drain valve and the drain valve water pressure driving portion are coupled by the clutch mechanism which is cut off at a predetermined timing, and therefore the drain valve can be moved and closed irrespective of the operation speed of the drain valve water pressure driving portion. Thus, even if there is a deviation in the operating speed of the drain valve water pressure driving unit when the drain valve is lowered, the timing of closing the drain valve can be controlled so as not to be affected by the deviation. When the second amount of washing water is selected by the washing water amount selecting unit, washing water is supplied from the draining unit into the water accumulating unit, and the timing control mechanism operates in accordance with the upward and downward 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 the washing water is selected is earlier than when the first amount of the washing water is selected. Thus, 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, the drain valve hydraulic driving unit preferably includes: a cylinder into which supplied washing water flows; a piston slidably disposed in the cylinder and driven by pressure of the cleaning water flowing into the cylinder; and a rod connected to the piston, for driving the drain valve, wherein the volume of the cleaning water stored between the water storage part and the float in the water storage part is smaller than the volume of the cylinder.

According to an embodiment of the present invention configured as described above, the float is moved up and down by accumulating the cleaning water amount smaller than the cleaning water amount of the piston driving the drain valve hydraulic driving unit between the water accumulating unit and the float, and the timing control mechanism can be operated earlier by the smaller cleaning water amount.

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

According to an embodiment of the present invention configured as described above, since the drain portion forms the downward drain port, the drain portion can easily supply the cleaning water to the lower portion between the water accumulation portion and the float, and the float can be moved upward and downward earlier by a relatively small amount of the cleaning water, so that the timing control mechanism can be operated.

In one embodiment of the present invention, it is preferable that at least a part of the water accumulation portion is located below a water stop level of the water tank.

According to an embodiment of the present invention thus constituted, since at least a part of the water accumulation portion is located below the water stop level of the water tank, buoyancy by the water stop level or less in the water tank can be generated at the float in a state where the water stop level is accumulated in the water tank, and the timing control mechanism can be operated by supplying a smaller amount of the water to the water accumulation portion.

In one embodiment of the present invention, it is preferable that a drain hole for draining the accumulated cleaning water is formed in the water accumulation portion.

According to an embodiment of the present invention thus constituted, since the drain hole for draining the stored washing water is formed in the water accumulation portion, the water accumulation portion can simultaneously store washing water and drain washing water with a relatively simple structure.

In one embodiment of the present invention, the drain hole of the water accumulation unit is preferably formed in a lower portion of a side wall of the water accumulation unit, and an opening is preferably formed so as to face an opposite side of the drain valve in a plan view.

According to an embodiment of the present invention configured as described above, it is possible to prevent 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 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.

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 accumulated in the water accumulation portion, and the timing control mechanism can be operated by supplying a smaller amount of washing water to the water accumulation portion.

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

Effects of the invention

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

Drawings

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

Fig. 2 is a cross-sectional view showing a schematic configuration of a flush tank apparatus according to a first embodiment of the present invention.

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

Fig. 4 is an enlarged view of a portion such as a drain valve and a water accumulation portion of the flush tank device according to the first embodiment of the present invention.

Fig. 5 is a view showing the operation of the first embodiment of the present invention in the large cleaning mode.

Fig. 6 is a view showing the operation of the first embodiment of the present invention in the large cleaning mode.

Fig. 7 is a view showing the operation of the first embodiment of the present invention in the large cleaning mode.

Fig. 8 is a diagram showing the operation of the first embodiment of the present invention in the large cleaning mode.

Fig. 9 is a diagram showing the operation of the first embodiment of the present invention in the large cleaning mode.

Fig. 10 is a view showing the operation of the cleaning tank device according to the first embodiment of the present invention in the large cleaning mode.

Fig. 11 is a view showing the operation of the cleaning tank device according to the first embodiment of the present invention in the small cleaning mode.

Fig. 12 is a view showing the operation of the cleaning tank device according to the first embodiment of the present invention in the small cleaning mode.

Fig. 13 is a view showing the operation of the cleaning tank device according to the first embodiment of the present invention in the small cleaning mode.

Fig. 14 is a view showing the operation of the cleaning tank device according to the first embodiment of the present invention in the small cleaning mode.

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

Fig. 16 is a cross-sectional view showing a schematic configuration of a flush tank apparatus according to a second embodiment of the present invention.

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

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

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

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

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

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

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

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

Fig. 25 is a cross-sectional view showing a schematic configuration of a flush tank apparatus according to a third embodiment of the present invention.

Detailed Description

Next, a flush 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 whole of a flush toilet apparatus including a flush tank apparatus according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing a schematic configuration of a flush tank apparatus 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 includes a toilet bowl main body 2 as a toilet bowl and a flush 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-washing toilet body 2 is washed by the washing water supplied from the washing water tank device 4. The flush toilet apparatus 1 of the present embodiment is configured to: after use, the remote control device 6 mounted on the wall surface is operated, or after the human body sensor 8 provided in the toilet seat senses the user's unseating, a predetermined time elapses, thereby cleaning the bowl portion 2a of the toilet main body 2. The flush tank device 4 of the present embodiment is configured to: based on the instruction signal from the remote control device 6 or the human body induction sensor 8, the washing water stored in the inside is discharged to the toilet main body 2, and the basin 2a is washed by the washing water.

Further, "large washing" or "small washing" for washing the tub portion 2a is performed by the user pressing the button 6a of the remote control 6. Therefore, in the present embodiment, the remote control device 6 functions as a cleaning water amount selecting unit that can select a first amount of cleaning water for cleaning the toilet main body 2 and a second amount of cleaning water smaller than the first amount of cleaning water. As a modification, the remote control device 6 may be configured as a cleaning water amount selecting unit capable of changing the cleaning water amount to another predetermined setting, or may be configured as a cleaning water amount selecting unit capable of arbitrarily changing the cleaning water amount. In the present embodiment, the human body 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 user can sense the sitting, unseating, approaching, separating, and extending actions of the user, for example, the toilet bowl main body 2 and the flush tank device 4. The human body sensor 8 may be any one that can sense the sitting, unseating, approaching, separating, and stretching actions of the user, and for example, an infrared sensor or a microwave sensor may be used as the human body sensor 8. The remote control device 6 may be changed to a lever device or an operation button device having a structure capable of mechanically controlling the opening and closing of the first control valve 16 and the second control valve 22 described later.

As shown in fig. 2, the flush tank apparatus 4 includes: a water storage tank 10 for storing 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 tank 10; and a drain valve water pressure driving unit 14 for driving the drain valve 12. The flush tank device 4 includes inside: a first control valve 16 for controlling water supply to the drain valve water pressure driving section 14; and a solenoid valve 18 mounted to the first control valve 16. The cleaning tank device 4 includes, in the water storage tank 10: a second control valve 22 for supplying washing water to the water storage tank 10; and a solenoid valve 24 mounted to the second control valve 22. The flush tank device 4 further includes a clutch mechanism 30, and the clutch mechanism 30 connects the drain valve 12 to the drain valve hydraulic driving unit 14, and lifts the drain valve 12 by the driving force of the drain valve hydraulic driving unit 14. A housing 13 is formed above the drain valve 12, and the housing 13 is formed in a cylindrical shape with a lower side opening. The housing 13 is connected and fixed to the drain valve hydraulic pressure driving portion 14 and the drain portion 54.

The water storage tank 10 is a tank configured to store the washing water to be supplied to the flush toilet body 2, and a drain port 10a for draining the stored washing water to the flush toilet body 2 is formed at the bottom thereof. In the water reservoir 10, an overflow pipe 10b is connected to the downstream side of the drain port 10a. 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 storage tank 10. Therefore, the washing water flowing in from the upper end of the overflow pipe 10b bypasses the drain port 10a and directly flows out to the toilet body 2.

The drain valve 12 is a valve body arranged to open and close the drain port 10a, and the drain valve 12 is lifted up to open the valve, so that the wash water in the reservoir 10 is discharged to the toilet main body 2, and the bowl 2a is washed. The drain valve 12 supplies the washing water to the bidet body 2 and stops the supply of the washing water to the bidet body 2. When the drain valve 12 is lifted up by the driving force of the drain valve water pressure driving unit 14 and lifted up to a predetermined height, the clutch mechanism 30 is cut off, and the drain valve 12 is lowered by its own weight. When the drain valve 12 is lowered, the drain valve 12 is held by a holding mechanism 46 described later for a predetermined time, and the time until the drain valve 12 is seated in the drain port 10a is adjusted.

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

A spring 14c is disposed inside the cylinder tube 14a, and biases the piston 14b downward. A seal 14e is attached 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 30 is provided at the lower end of the lever 32, and the lever 32 is coupled to the valve shaft 12a of the drain valve 12 and the coupling between the lever 32 and the valve shaft 12a of the drain valve 12 is released by the clutch mechanism 30.

The cylinder tube 14a is a cylindrical member whose axis is arranged toward the vertical direction, and houses the piston 14b slidably therein. A driving portion water supply passage 34a is connected to the lower end portion of the cylinder 14a, and the cleaning water flowing out of the first control valve 16 flows into the cylinder 14 a. Accordingly, 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 the upper portion of the cylinder tube 14a, and the driving portion drain passage 34b communicates with the inside of the cylinder tube 14a via the outflow hole. Therefore, when the washing water flows into the cylinder 14a from the driving portion water supply path 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. Then, when the piston 14b is pushed up to the second position above the outflow hole, the water flowing into the cylinder 14a flows out from the outflow hole through the driving portion drain passage 34 b. That is, when the piston 14b moves to the second position, the driving portion water supply passage 34a and the driving portion water discharge passage 34b communicate via the inside of the cylinder 14 a. A discharge portion 54 is formed at the tip end portion of the driving portion discharge passage 34b extending from the cylinder tube 14 a. In this way, the driving portion drain passage 34b forms a flow path extending to the drain portion 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 tube 14a so as to protrude downward from the cylinder tube 14 a. The rod 32 is connected to the piston 14b to drive the drain valve 12. 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 of the gap 14 d. The water flowing out of the gap 14d flows into the water reservoir 10. Since the gap 14d is relatively narrow and the flow path resistance is large, even when water flows out of the gap 14d, the pressure in the cylinder 14a is increased by the washing water flowing into the cylinder 14a from the driving portion water supply path 34a, and the piston 14b is pushed up against the urging 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 portion 14 based on the operation of the solenoid valve 18, and to control the supply of water to the drain portion 54 and the stop of the supply of water to the drain portion 54. Accordingly, the first control valve 16 is provided in a flow path for supplying the washing water to a drain 54 or the like as a valve control unit described later, and controls the supply of the washing water to the drain 54 or the like as the valve control unit. Accordingly, the first control valve 16 supplies the cleaning water to the drain 54 and the like, which are valve control portions, via the drain valve hydraulic pressure driving portion 14.

The first control valve 16 includes: a main valve body 16a; a main valve port 16b opened and closed by the main valve body 16a; a pressure chamber 16c for moving the main valve body 16a; and a pilot valve 16d for switching 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, tap water supplied from the water supply pipe 38 flows into the drain valve water pressure driving portion 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 pressure inside the pressure chamber increases. When the pressure in the pressure chamber 16c increases, 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 port (not shown) is opened by a pilot valve, water in the pressure chamber 16c flows out and the pressure in the interior is reduced. When the pressure in the pressure chamber 16c decreases, the main valve body 16a unseats from the main valve port 16b, and the first control valve 16 opens. When the pilot valve 16d is closed, the pressure in the pressure chamber 16c increases, and the first control valve 16 is closed.

The pilot valve 16d is moved by the 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 induction sensor 8, and the controller 40 transmits an electric signal to the solenoid valve 18 to operate the solenoid valve. Thus, the first control valve 16 is controlled by the controller 40.

A vacuum regulator valve 36 is provided in the driving unit water supply path 34a between the first control valve 16 and the drain valve water pressure driving unit 14. By the vacuum regulating valve 36, when the first control valve 16 side is negative pressure, the backflow of water to the first control valve 16 side is prevented.

Next, the second control valve 22 is configured to control the water supply to the water reservoir 10 and stop the water supply to the water 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 a solenoid 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 tap water flowing from the water supply pipe 38 is supplied into the water tank 10 or the overflow pipe 10b. 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 transmits an electric signal to the solenoid valve 24 based on the operation of the remote control device 6, and operates the solenoid valve. Thus, the second control valve 22 is controlled by the controller 40. When the solenoid valve 24 is omitted, the pilot valve 22c may be controlled by the float switch 42 as will be described later.

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

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

The water supply line 50 is provided with a vacuum regulating valve 44. By the vacuum regulating valve 44, when the second control valve 22 side is negative pressure, the backflow of water to the second control valve 22 side is prevented.

The water supplied from the water supply line is supplied to the first control valve 16 and the second control valve 22 via a stopper 38a disposed outside the water tank 10 and a constant flow valve 38b disposed in the water tank 10 downstream of the stopper 38 a. The water stopper 38a is provided for stopping the supply of water to the flush tank device 4 at the time of maintenance or the like, and is normally used in a state of being opened. The constant flow valve 38b is provided to allow water supplied from the tap water pipe 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 flush toilet device 1.

The controller 40 incorporates a CPU, a memory, and the like, and controls the connected devices so as to execute a large purge mode and a small purge mode 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 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 by the drain valve water pressure driving portion 14.

First, as shown in column (a) of fig. 3, the clutch mechanism 30 is provided at the lower end of the lever 32 extending downward from the drain valve water pressure driving portion 14, and is configured to connect the lower end of the lever 32 to the upper end of the valve shaft 12a of the drain valve 12 and to disconnect the lower end of the lever 32 from the upper end of the valve shaft 12a of the drain valve 12. The clutch mechanism 30 includes: a rotation shaft 30a mounted to a lower end of the lever 32; a hook member 30b supported by the rotation shaft 30 a; and an engagement claw 30c provided at an upper end of the valve shaft 12 a. With this structure, the clutch mechanism 30 is cut off at a predetermined timing and a predetermined lifting height, and the drain valve 12 is lowered.

The rotation shaft 30a is fitted to the lower end of the lever 32 so as to face in the horizontal direction, and rotatably supports the hook member 30 b. The hook member 30b is a plate-like member, and its intermediate portion is rotatably supported by the rotation shaft 30 a. The lower end of the hook member 30b is bent into a hook shape, and a hook portion is formed. The engagement claw 30c provided at the upper end of the valve shaft 12a of the drain valve 12 is a right-angle triangular claw. The engagement claw 30c is formed such that the bottom side thereof is oriented substantially horizontally and the side surface thereof is inclined downward.

In the state shown in column (a) of fig. 3, the drain valve 12 is seated on the drain port 10a, and the drain port 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 column (b) of fig. 3, when the water is supplied to the water discharge valve hydraulic driving unit 14, the piston 14b moves upward, and the water discharge valve 12 is lifted up by the rod 32. As shown in column (c) of fig. 3, when the drain valve 12 is lifted to the predetermined position, the upper end of the hook member 30b abuts against the bottom surface of the drain valve water pressure driving unit 14, and the hook member 30b rotates about the rotation shaft 30 a. By this rotation, the hook portion at the lower end of the hook member 30b moves in a direction of disengaging 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 from the washing water stored in the water storage tank 10, as shown in fig. 3 (d). (As will be described later, the lowered drain valve 12 is temporarily held at a predetermined height by the holding mechanism 46 before being seated in the drain port 10 a.)

When the supply of the washing water to the drain valve hydraulic drive unit 14 is stopped, the lever 32 is lowered by the urging force of the spring 14c, as shown in column (e) of fig. 3. When the lever 32 is lowered, as shown in 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 against the engaging claw 30 c. When the lever 32 is further lowered, as shown in column (g) of fig. 3, the hook portion of the hook member 30b is pushed by the inclined surface of the engagement claw 30c, and the hook member 30b rotates. When the lever 32 is further lowered, as shown in fig. 3 (h), the hook portion of the hook member 30b passes over the engaging claw 30c, the hook member 30b is rotated to the original position by gravity, and the engaging claw 30c is engaged with the hook portion of the hook member 30b again, and the state shown in fig. 3 (a) is restored.

Referring back to fig. 2 and 4, the water accumulation portion and the like of the flush tank device 4 will be described.

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

As shown in fig. 2, the flush tank apparatus 4 further includes: a discharge unit 54 for discharging the supplied cleaning water; and a water accumulation portion 56 for accumulating the washing water discharged from the discharge portion 54; a float 26 provided in the water accumulation portion 56 and moving up and down according to the water level in the water accumulation portion 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 drain valve 12 is restricted and a non-holding state in which the lowering of the drain valve 12 is not restricted (a state in which the engagement with the holding claw 12b of the drain valve 12 is released) in conjunction with the movement of the transmission portion 48. As a modification, the flush tank device 4 may be defined to further include: a discharge portion 54; a water accumulation portion 56; a float 26; and a timing control mechanism coupled to the float 26, which operates in response to the upward and downward movement of the float 26, and which controls the timing of lowering the drain valve 12 so that the timing of closing the drain port 10a when the second amount of the washing water is selected is earlier than the timing of closing the drain port when the first amount of the washing water is selected. Such a timing control mechanism may be defined to include: 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 drain valve 12 is restricted and a non-holding state in which the lowering of the drain valve 12 is not restricted (a state in which the engagement with the holding claw 12b of the drain valve 12 is released) in conjunction with the movement of the transmission portion 48.

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 coupled to the holding mechanism 46 and is set to operate at a timing corresponding to the amount of the cleaning water selected by the remote control device 6 or the like. The flush 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 causes the holding mechanism 46 to be engaged with the drain valve 12 for a first time, and then causes the holding mechanism 46 to operate so as to release the engagement between the holding mechanism 46 and the drain valve 12, and causes the drain valve 12 to descend after the first time has elapsed. When the second 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 be engaged with the drain valve 12 for a second time shorter than the first time, and then causes the holding mechanism 46 to be operated so as to release the engagement between the holding mechanism 46 and the drain valve 12, and causes the drain valve 12 to descend after the second time has elapsed. When an arbitrary amount of the washing water is selected by the remote control device 6 or the like, the valve control unit causes the holding mechanism 46 to be engaged with the drain valve 12 for a predetermined time corresponding to the arbitrary amount of the washing water, and then causes the holding mechanism 46 to be operated so as to release the engagement between the holding mechanism 46 and the drain valve 12, and causes the drain valve 12 to be lowered after the predetermined time has elapsed. Thus, the first amount of the washing water (the amount of washing water for the large washing mode) and the second amount of the washing water (the amount of washing water for the small washing mode) are not limited, and the amount of washing water can be changed relatively easily according to the use state of the user, and any amount of washing water can be supplied to the toilet body 2. The valve control unit formed by the drain 54, the water accumulation 56, the float 26, and the transmission unit 48 is configured to operate by the supplied washing water.

The drain 54 drains the supplied washing water when the second amount of washing water is selected by the remote control 6. The drain 54 is configured to drain the washing water even when the first amount of washing water is selected by the remote control 6. The discharge portion 54 is formed at the lower end of the driving portion discharge path 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 whose tip is thin and downward. Therefore, the washing water is accelerated downward by gravity, and the flow path is narrowed at the discharge port, so that the flow rate thereof is further accelerated. The drain 54 is disposed inside the sidewall of the water accumulation 56 and above the full water level WL.

At least a part of the water accumulation portion 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 portion 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. The water accumulation portion 56 is formed in a hollow box shape, and an upper surface thereof is opened. A part of the side wall of the water accumulation portion 56 is formed by the housing 13, and the water accumulation portion 56 is fixed to the housing 13. The water accumulation portion 56 is disposed below the drain portion 54, and is configured to receive the washing water drained from the drain portion 54. Further, the water accumulation portion 56 is disposed so as to surround the outside of the float 26. The volume of the cleaning water that can be accumulated between the water accumulating portion 56 and the float 26 in the water accumulating portion 56 is smaller than the volume of the cylinder 14 a. A drain hole 56b for draining the accumulated cleaning water is formed in the water accumulation portion 56. The drain hole 56b is formed in a lower portion of the side wall 56c of the water accumulation portion 56, and is open toward the opposite side of the valve shaft 12a of the drain 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 drain hole 56b to the outside of the water accumulation portion 56 (inside the water reservoir 10) is smaller than the instantaneous flow rate A2 (see fig. 7) of the washing water discharged from the drain portion 54.

The float 26 is disposed in the water accumulation portion 56. The float 26 is a hollow rectangular parallelepiped member configured to receive buoyancy from the washing water stored in the water accumulation portion 56. When the water level in the water accumulation portion 56 is equal to or higher than a predetermined water level (approximately the water level of the float 26), the float 26 is in a state shown by a solid line in column (a) of fig. 4 due to the buoyancy. The float 26 is driven based on the water level in the water accumulation 56, indirectly in relation to the water level in the water reservoir 10, but directly independently.

The transmission portion 48 is formed as a rod-like member extending downward in the vertical direction from the lower surface of the float 26. The transfer portion 48 is fixed to the lower surface of the float 26. The transmission portion 48 penetrates the bottom surface of the water accumulation portion 56 and extends below the water accumulation portion 56. The transmission portion 48 is not fixed to the water accumulation portion 56, and is slidably disposed with respect to the water accumulation portion 56. The lower end of the transmission portion 48 is coupled to the holding mechanism 46. Accordingly, the transmission unit 48 moves up and down in the same manner as the float 26 moves up and down, and the holding mechanism 46 is operated.

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

The holding mechanism 46 moves between a holding state and a 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 moving 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 rotation shaft fixed to the water reservoir 10 by an arbitrary member (not shown), and rotatably supports the arm member 46b and the engagement member 46c. On the other hand, a holding claw 12b formed to be engageable with the engaging member 46c is formed at the base end portion of the valve shaft 12a of the drain valve 12. The holding claw 12b is a rectangular triangular projection extending from the valve shaft 12a toward the engaging member 46c, and extends with its bottom side facing in the horizontal direction and its side surface 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 reservoir 10 by an arbitrary member (not shown), and the intermediate portion is bent away from the valve shaft 12 a. The arm member 46b is a bent beam-shaped member, and is configured such that its lower end portions are branched into two. 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 drain valve 12 moves in the vertical direction, the support shaft 46a and the arm member 46b do not interfere with the holding claw 12b provided to the valve shaft 12a of the drain valve 12.

On the other hand, the upper end portion of the arm member 46b is rotatably coupled to the transmission portion 48. Accordingly, in a state where the float 26 is subjected to 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 by their own weight, and the arm member 46b and the engagement member 46c pivot about the support shaft 46a to a state shown by the phantom line in column (a) of fig. 4. The rotation of the arm member 46b and the engagement member 46c is limited from the holding state of the holding mechanism 46 shown by the solid line in column (a) of fig. 4 to the non-holding state shown by the virtual line.

The engaging member 46c is a member that is rotatably mounted on the support shaft 46a, and the base end portions thereof are rotatably supported at both end portions of the support shaft 46 a. The engagement member 46c is formed to be engageable with the drain valve 12 in accordance with the position of the float 26. The engagement member 46c extends such that the tip end portion thereof is bent toward the valve shaft 12a of the drain valve 12. When the float 26 rises due to the accumulation of the cleaning water in the water accumulation portion 56, the holding mechanism 46 disposes the engagement member 46c at a position where it can engage with the drain valve 12. Therefore, in the holding state in which the engaging member 46c is rotated to the position shown by the solid line in the column (a) of fig. 4, the tip end portion of the engaging member interferes with the holding pawl 12b provided in the valve shaft 12 a. On the other hand, when the float 26 is lowered, as shown in the phantom line of the column (a) of fig. 4, the holding mechanism 46 moves the engagement member 46c to a position where the engagement with the drain valve 12 is released. In this way, in the non-holding state in which the engagement member 46c rotates to the position shown by the phantom line in fig. 4 (a), interference between the distal end portion of the engagement member 46c and the holding claw 12b does not occur.

The engaging member 46c is configured to rotate in conjunction with the arm member 46b about the support shaft 46 a. That is, when the float 26, the transmission 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 virtual line, the engaging member 46c rotates to the state shown by the virtual 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 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 by being rotated. That is, when the tip end portion of the engaging member 46c is pushed up by the holding claw 12b, only the engaging member 46c can be rotated to the position shown by the phantom line in fig. 4 in a state where the float 26, the transmitting portion 48, and the arm member 46b are held at the positions shown by the solid lines.

On the other hand, as shown by the solid line in column (b) of fig. 4, in a state where the drain valve 12 is lifted up and the holding claw 12b is located above the engaging member 46c, the holding claw 12b engages with the engaging member 46c, and the drain valve 12 is prevented from being lowered. That is, the engagement member 46c constituting the holding mechanism 46 engages with the drain valve 12 to hold the drain valve 12 at a predetermined height. Accordingly, the drain valve 12 is lifted by the lever 32 (fig. 3) connected to the drain valve hydraulic driving portion 14, and then, when the clutch mechanism 30 is disengaged, the drain valve 12 is lowered. During this lowering, the holding claw 12b of the drain valve 12 engages with the engagement member 46c of the holding mechanism 46, and the drain valve 12 is held at a predetermined height.

Next, when the water level in the water accumulation portion 56 decreases, the position of the float 26 decreases, and the float 26, the transmission portion 48, and the arm member 46b move to the positions shown by the phantom line in column (b) of fig. 4. In conjunction with this movement, the engaging member 46c also rotates to the position shown by the phantom line in the column (b) of fig. 4, and therefore, the engagement of the holding claw 12b with the engaging member 46c is released. Thereby, the drain valve 12 is lowered, and is seated in the drain port 10a, and the drain port 10a is closed.

Next, the operation of the flush tank apparatus 4 according to the first embodiment of the present invention and the flush toilet apparatus 1 provided with the flush tank apparatus 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 water tank 10 is at a 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 column (a) of fig. 4. In the standby state before the drain 54 drains the cleaning water, the cleaning water is stored in the water accumulation portion 56, the float 26 of the water accumulation portion 56 rises by receiving the buoyancy of the cleaning water, the transmission portion 48 connected to the float 26 rises, and the holding mechanism 46 is in a holding state. Next, when the user presses the large purge button of the remote control device 6 (fig. 1), the remote control device 6 transmits an instruction signal for executing the large purge mode to the controller 40 (fig. 2). Further, when the small washing button is pressed, an instruction signal for executing the small washing mode is transmitted to the controller 40. As described above, in the present embodiment, the flush toilet apparatus 1 includes two flush modes, i.e., the large flush mode and the small flush mode, in which the flush water amounts are different, and the remote control device 6 functions as a flush water amount selecting section that selects the flush water amount.

In the flush toilet apparatus 1 of the present embodiment, even when the user's unseating is detected by the human body sensor 8 (fig. 1) and the cleaning button of the remote control device 6 is not pressed and the predetermined time has elapsed, the instruction signal for toilet cleaning is transmitted to the controller 40. When the time from when the user sits on the flush toilet apparatus 1 to when the user leaves the seat is less than the predetermined time, the controller 40 determines that the user has performed urination and executes the small flush mode. On the other hand, when the time from sitting to unseating is equal to or longer than a predetermined time, the controller 40 executes the large cleaning mode. In this case, therefore, the controller 40 selects the large cleaning mode in which the first cleaning water amount is used for cleaning and the small cleaning mode in which the second cleaning water amount smaller than the first cleaning water amount is used for cleaning, and therefore, the controller 40 functions as the cleaning water amount selecting section.

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

When receiving the instruction signal indicating that the large purge should be performed, the controller 40 operates the solenoid valve 18 (fig. 2) provided in the first control valve 16, and unseats the pilot valve 16d on the solenoid valve side from the pilot valve port. Thereby, the pressure in the pressure chamber 16c is reduced, 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 water pressure driving portion 14 via the first control valve 16. Thereby, the piston 14b of the drain valve hydraulic driving unit 14 is pushed up, the drain valve 12 is lifted up via the rod 32, and the wash water in the reservoir 10 is discharged from the drain port 10a to the toilet body 2. At this time, the pilot valve 16d is still in an open state, and the washing water flowing from the water supply pipe 38 is continuously supplied to the drain valve hydraulic driving portion 14 via the first control valve 16. The piston 14b is raised to the second position, and the driving portion water supply path 34a and the driving portion water discharge path 34b communicate with each other via the inside of the cylinder 14a, so that the washing water is discharged from the discharge portion 54 to the water accumulation portion 56. Accordingly, after the drain valve 12 is lifted by the drain valve water pressure driving unit 14, the supply of the washing water from the first control valve 16 to the water accumulation unit 56 is started. As will be described later, since the clutch mechanism 30 is disconnected by the rise of the drain valve 12, after the clutch mechanism 30 is disconnected, the supply of the washing water from the first control valve 16 to the water accumulation portion 56 or the like as the valve control portion is started.

When the drain valve 12 is lifted, the holding claw 12b provided on the valve shaft 12a of the drain valve 12 pushes up and rotates the engaging member 46c of the holding mechanism 46, and the holding claw 12b passes over the engaging member 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 cut 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 water pressure driving portion 14, and the clutch mechanism 30 is cut off (column (b) → (c) of fig. 3).

When the clutch mechanism 30 is disengaged, the drain valve 12 starts to descend toward the drain port 10a due to its own weight. Here, immediately after the drain valve 12 is opened, the water level in the water accumulation portion 56 is high, and therefore the float 26 is at a position where it floats due to buoyancy, the transmission portion 48 is in a raised state, and the holding mechanism 46 is set to a holding state shown by a solid line in column (b) of fig. 4. Accordingly, the holding claw 12b of the lowered drain valve 12 is engaged with the engagement member 46c of the holding mechanism 46, and the drain 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 the open state, and the drain of the washing water in the water storage tank 10 to the toilet main body 2 is maintained. When the clutch mechanism 30 is turned off and the drain port 10a is opened, the pilot valve 16d is still opened, and the washing water is drained from the drain portion 54 to the water accumulation portion 56. Accordingly, the float 26 in the water accumulation portion 56 is restricted from descending, and the drain valve 12 is restricted from descending.

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 turned off, the pilot valve 22c provided in the second control valve 22 is opened. Accordingly, the washing water is supplied from the second control valve 22 into the water tank 10 via 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. The washing water flowing from the water supply pipe 38 is still discharged from the discharge portion 54 to the water accumulation portion 56 via the first control valve 16 and the drain valve hydraulic pressure driving portion 14.

The washing water discharged from the discharge portion 54 is stored in the water accumulation portion 56. At this time, the cleaning water is slightly discharged from the discharge hole 56b to the outside of the water accumulation portion 56 (into the water reservoir 10). On the other hand, the instantaneous flow rate A1 (see fig. 7) of the washing water discharged from the discharge hole 56b is smaller than the instantaneous flow rate A2 (see fig. 7) of the washing water discharged from the discharge portion 54. The cleaning water discharged to the water accumulation portion 56 exceeds the upper end of the water accumulation portion 56 and flows out into the water reservoir 10. In this way, the amount of the cleaning water in the water accumulation portion 56 is not reduced, and the water level is maintained substantially the same as the water level in the standby state before the start of cleaning. Therefore, the water level in the water accumulation portion 56 is high, and therefore the float 26 is at a position where it floats due to buoyancy, the transmission portion 48 is in a raised state, and the holding mechanism 46 is set to a holding state shown by a solid line in column (b) of fig. 4. Accordingly, the holding claw 12b of the lowered drain valve 12 is engaged with the engagement member 46c of the holding mechanism 46, and the drain 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 the open state, and the drain of the washing water in the water storage tank 10 to the toilet main body 2 is maintained.

Next, as shown in fig. 8, when the controller 40 selects the large purge mode, after a first time elapses from when the controller 40 opens the solenoid valve 18 (starts purging), the solenoid valve 18 is closed, and the first control valve 16 is closed. The timing (the lapse of the first time) at which the controller 40 closes the solenoid valve 18 is set in consideration of the following timing: as will be described later, the cleaning water in the water accumulation portion 56 is lowered, and the float 26 is lowered at a timing such that the drain valve 12 is seated in the drain port 10a when the water level in the water reservoir 10 is lowered to the predetermined water level WL1, and the drain port 10a is closed. The first control valve 16 closes, and thus the supply of the washing water to the drain valve hydraulic driving portion 14 and the drain portion 54 is stopped. Immediately after the supply of the cleaning water is stopped, the cleaning water is stored in the water accumulating portion 56 substantially near the full state of the water outside the float 26 in the water accumulating portion 56, and the float 26a is in a state (a state of being floated by receiving buoyancy) as shown in fig. 7. Then, the washing water stored in the water accumulation portion 56 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water accumulation portion 56 is lowered.

As shown in fig. 8, when the water level of the washing water in the water accumulation portion 56 decreases to the predetermined water level WL3 (in this case, the water level in the water tank 10 corresponds to the water level decreased to the predetermined water level WL 1), the position of the float 26 connected to the transmission portion 48 and the holding mechanism 46 decreases. Thereby, the holding mechanism 46 shifts to a non-holding state shown by a virtual line in 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. When the holding mechanism 46 is shifted to the non-holding state, the drain valve 12 is disengaged 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 tank 10 via 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 drain valve 12 is held until the water level in the water storage tank 10 decreases from the full water level WL to the predetermined water level WL1, and the first flush water amount is discharged to the flush toilet body 2.

On the other hand, the float switch 42 is still in the off state, and thus the valve-open state of the second control valve 22 is maintained, and water is continuously supplied to the water tank 10. The washing water supplied through the water supply channel 50 reaches the water supply channel branching portion 50a, and a part of the washing water branched at the water supply channel branching portion 50a flows into the overflow pipe 10b, and the remaining part is stored in the water storage tank 10. The washing water flowing into the overflow pipe 10b flows into the main body 2 for water supply to the bowl 2 a. In a state where the drain valve 12 is closed, the wash water flows into the water reservoir 10, whereby the water level in the water reservoir 10 rises.

As shown in fig. 10, when the water level in the water reservoir 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 the valve. Accordingly, the pilot valve 22c is in a valve-closed state, and therefore, the pressure in the pressure chamber 22b rises, and 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 storage tank 10 rises to the predetermined full water level WL, the washing water flows into the water accumulation portion 56, the float 26 and the transmission portion 48 rise, and the holding mechanism 46 returns to the holding state.

After the first control valve 16 is closed and the supply of water to the drain valve water pressure driving portion 14 is stopped as shown in fig. 8, the washing water in the cylinder 14a of the drain valve water pressure driving portion 14 slowly flows out from the gap 14d as shown in fig. 9 and 10, and the piston 14b is pressed down by the urging force of the spring 14c, and the lever 32 is lowered accordingly. Thus, the clutch mechanism 30 is connected (see fig. 3 (e) to (h)) and returns to the standby state before the toilet cleaning starts.

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

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

When receiving the instruction signal indicating that the small purge should be performed, the controller 40 operates the solenoid valve 18 provided 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 water pressure driving portion 14 via the first control valve 16. Thereby, the piston 14b of the drain valve hydraulic driving unit 14 is pushed up, the drain valve 12 is lifted up via the rod 32, and the wash water in the reservoir 10 is discharged from the drain port 10a to the toilet body 2. When the drain valve 12 is lifted, the holding claw 12b (column (a) of fig. 4) provided on the valve shaft 12a of the drain valve 12 pushes up and rotates the engaging member 46c of the holding mechanism 46, and the holding claw 12b passes over the engaging member 46c.

Next, as shown in fig. 12, when the drain valve 12 is further lifted, the clutch mechanism 30 is cut 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 water pressure driving portion 14, and the clutch mechanism 30 is cut off (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 portion 54 is stored in the water accumulation portion 56. At this time, the cleaning water is slightly discharged from the discharge hole 56b to the outside of the water accumulation portion 56 (into the water reservoir 10). On the other hand, the instantaneous flow rate A1 (see fig. 7) of the washing water discharged from the discharge hole 56b is smaller than the instantaneous flow rate A2 (see fig. 7) of the washing water discharged from the discharge portion 54. The cleaning water discharged to the water accumulation portion 56 exceeds the upper end of the water accumulation portion 56 and flows out into the water reservoir 10. In this way, the amount of the cleaning water in the water accumulation portion 56 is not reduced, and the water level is maintained substantially the same as the water level in the standby state before the start of cleaning. Therefore, the water level in the water accumulation portion 56 is high, and therefore the float 26 is at a position where it floats due to buoyancy, the transmission portion 48 is in a raised state, and the holding mechanism 46 is set to a holding state shown by a solid line in column (b) of fig. 4. Accordingly, the holding claw 12b of the lowered drain valve 12 is engaged with the engagement member 46c of the holding mechanism 46, and the drain 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 the open state, and the drain of the washing water in the water storage 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 opens the solenoid valve 18 (starts purging) and then closes the solenoid 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 elapse of the second time) at which the controller 40 closes the solenoid valve 18 is set in consideration of the following timing: as will be described later, the cleaning water in the water accumulation portion 56 is lowered, and the float 26 is lowered at a timing such that the drain valve 12 is seated in the drain port 10a when the water level in the water reservoir 10 is lowered to the predetermined water level WL2, and the drain port 10a is closed. The first control valve 16 closes, and thus the supply of the washing water to the drain valve hydraulic driving portion 14 and the drain portion 54 is stopped. Immediately after the supply of the cleaning water is stopped, the cleaning water is stored in the water accumulating portion 56 substantially near the full state of the water outside the float 26 in the water accumulating portion 56, and the float 26 is in a state (a state of being floated by receiving buoyancy) as shown in fig. 12. Then, the washing water stored in the water accumulation portion 56 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water accumulation portion 56 is lowered.

As shown in fig. 13, when the water level of the washing water in the water accumulation portion 56 decreases to a predetermined water level WL4 (a water level substantially equal to the predetermined water level WL 3) (in this case, the water level in the water tank 10 corresponds to the water level decreased to the predetermined water level WL 2), the position of the float 26 connected to the transmission portion 48 and the holding mechanism 46 decreases. Thereby, the holding mechanism 46 shifts to a non-holding state shown by a virtual line in 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. When the holding mechanism 46 is shifted to the non-holding state, the drain valve 12 is disengaged 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 tank 10 via the water supply path 50 is continued.

As shown in fig. 14, the descending drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. In this way, when the small flush mode is executed, the drain valve 12 is held until the water level in the water reservoir 10 decreases from the full water level WL to the predetermined water level WL2, and the second flush water amount is discharged to the flush toilet body 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 the valve. Accordingly, the pilot valve 22c is in a valve-closed state, and therefore, the pressure in the pressure chamber 22b rises, and 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 storage tank 10 rises to the predetermined full water level WL, the washing water flows into the water accumulation portion 56, the float 26 and the transmission portion 48 rise, and the holding mechanism 46 returns to the holding state.

After the first control valve 16 is closed and the supply of water to the drain valve water pressure driving portion 14 is stopped as shown in fig. 13, the washing water in the cylinder 14a of the drain valve water pressure driving portion 14 slowly flows out from the gap 14d as shown in fig. 14 and 15, and the piston 14b is pressed down by the urging force of the spring 14c, and the lever 32 is lowered accordingly. Thus, the clutch mechanism 30 is connected (see fig. 3 (e) to (h)) and returns to the standby state before the toilet cleaning starts.

According to the flush tank device 4 of the first embodiment of the present invention described above, the drain valve 12 and the drain valve water pressure driving unit 14 are coupled by the clutch mechanism 30, and the clutch mechanism 30 is cut off at a predetermined timing, so that the drain valve 12 can be moved and the drain valve 12 can be closed regardless of the operation speed of the drain valve water pressure driving unit 14. Thus, even if there is a deviation in the operating speed of the drain valve water pressure driving unit when the drain valve is lowered, the timing of closing the drain valve can be controlled so as not to be affected by the deviation. When the first amount of the cleaning water is selected by the remote control device 6, the holding mechanism 46 is engaged with the drain valve 12, the valve control unit operates the holding mechanism 46 to release the engagement between the holding mechanism 46 and the drain valve 12 when a first time elapses, and when the second amount of the cleaning water is selected by the remote control device 6, the holding mechanism 46 is engaged with the drain valve 12, and the valve control unit operates the holding mechanism 46 to release the engagement between the holding mechanism 46 and the drain valve 12 when a 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 is earlier than when the first amount of cleaning 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 while using the clutch mechanism 30.

Further, according to the flush tank device 4 of the first embodiment of the present invention, the controller 40 controls the first control valve 16, and the valve control unit operates with the flush water supplied from the first control valve 16. Accordingly, the first and second amounts of cleaning water can be set by lowering the drain valve 12 by the lapse of a predetermined time while using the clutch mechanism 30, with a relatively compact and simple configuration.

In the flush water tank device 4 according to the first embodiment of the present invention, after the drain valve 12 is lifted by the drain valve water pressure driving unit 14, supply of flush water from the first control valve 16 to the valve control unit is started. Accordingly, the first and second amounts of wash water can be set by lowering the drain valve 12 by a predetermined time period using the clutch mechanism 30 with a relatively compact and simple configuration so as not to hinder the operation of the drain valve water pressure driving unit 14 to raise the drain valve 12 by wash water.

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

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

In the flush water tank device 4 according to the first embodiment of the present invention, when the float 26 is raised by storing the flush water in the water storage portion 56, the holding mechanism 46 positions the engagement member 46c at a position where the engagement member can engage 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 the engagement member is disengaged from the drain valve 12. By using the water accumulation portion 56 and the float 26 provided in the water accumulation portion 56 in this manner, the influence of the deviation in the flow rate of the washing water supplied to the water accumulation portion 56 can be suppressed, and the operation of the holding mechanism 46 can be made relatively stable by a relatively simple configuration. Therefore, according to the embodiment of the present invention, the first and second amounts of cleaning water can be set relatively stably while using the clutch mechanism 30.

Further, according to the flush tank device 4 of the first embodiment of the present invention, after the clutch mechanism 30 is turned off, supply of flush water from the first control valve 16 to the valve control section is started. Accordingly, the first and second amounts of wash water can be set by lowering the drain valve 12 by a predetermined time period using the clutch mechanism 30 with a relatively compact and simple configuration so as not to hinder the operation of the drain valve water pressure driving unit 14 to raise the drain valve 12 by wash water.

Further, a flush toilet apparatus according to a first embodiment of the present invention includes a plurality of flush patterns having different amounts of flush water, and includes: washing the toilet bowl; and a flush tank device according to the present invention that supplies flush water to the flush toilet.

In the flush tank device 4 according to the first embodiment of the present invention, since the drain valve 12 and the drain valve water pressure driving unit 14 are coupled by the clutch mechanism 30, and the clutch mechanism 30 is cut off at a predetermined timing, the drain valve 12 can be moved and the drain valve 12 can be closed regardless of the operation speed of the drain valve water pressure driving unit 14. Thus, even if there is a deviation in the operating speed of the drain valve water pressure driving unit when the drain valve is lowered, the timing of closing the drain valve can be controlled so as not to be affected by the deviation. When the second amount of washing water is selected by the remote control device 6, washing water is supplied from the drain 54 into the water accumulation unit 56, and the timing control mechanism operates in response to the upward and downward movement of the float 26. The timing control means lowers the drain valve 12 so that the timing at which the drain port 10a is closed when the second amount of the washing water is selected is earlier than when the first amount of the washing water is selected. This allows the first amount of cleaning water and the second amount of cleaning water to be set while using the clutch mechanism 30.

In the flush water tank device 4 according to the first embodiment of the present invention, the float 26 moves up and down by accumulating a smaller amount of flush water between the water accumulation portion 56 and the float 26 than the amount of flush water driving the piston 14b of the drain valve hydraulic driving portion 14, and the timing control mechanism can be operated earlier by the smaller amount of flush water.

Further, according to the flush tank device 4 of the first embodiment of the present invention, since the drain 54 forms a downward drain, the drain 54 can easily supply flush water to the lower portion between the water accumulation portion 56 and the float 26, and the float 26 can be moved up and down earlier than a small amount of flush water to operate the timing control mechanism.

Further, according to the flush water tank device 4 of the first embodiment of the present invention, since at least a part of the water accumulation portion 56 is located below the water stop level of the water tank 10, buoyancy by the flush water at the water stop level or lower in the water tank 10 can be generated at the float 26 in a state where the flush water is accumulated in the water tank 10 to the water stop level, and the timing control mechanism can be operated by supplying a smaller amount of flush water to the water accumulation portion 56.

Further, according to the cleaning water tank device 4 of the first embodiment of the present invention, since the drain hole 56b for draining the stored cleaning water is formed in the water accumulation portion 56, the water accumulation portion 56 can simultaneously store the cleaning water and drain the cleaning water with a relatively simple configuration.

Further, according to the flush water tank device 4 of the first embodiment of the present invention, the flow of the flush water discharged from the discharge hole 56b can be suppressed from acting on the equipment provided on the drain valve 12 side, for example, equipment such as a timing control mechanism, and causing malfunction of the equipment.

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

Further, according to the flush tank device 4 of the first embodiment of the present invention, the timing control mechanism can be operated stably by a relatively simple mechanical structure, and the drain valve 12 can be lowered so that the timing at which the drain port 10a is closed when the second flush water amount is selected is earlier than when the first flush water amount is selected.

Next, a flush tank apparatus 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 parts as those of the flush tank apparatus 4 of the first embodiment of the present invention described above, and the description thereof will be omitted.

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

The flush tank device 104 according to the second embodiment of the present invention as shown in fig. 16 is provided in the flush toilet device 1 (see fig. 1) in the same manner as in the first embodiment of the present invention.

The flush tank device 104 has a clutch mechanism 130 that is cut off to lower the drain valve 12, and the clutch mechanism 130 connects the drain valve 12 to the drain valve hydraulic driving unit 14, and lifts the drain valve 12 by the driving force of the drain valve hydraulic driving unit 14. The housing 13 is connected to and fixed to the drain valve hydraulic pressure driving unit 14.

The drain valve 12 is lifted by the driving force of the drain valve water pressure driving unit 14, and the clutch mechanism 130 is cut off at a predetermined height or at a predetermined timing, so that 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 drain valve 12 is lowered and the drain valve 12 is seated in the drain 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 by the drain valve water pressure driving portion 14. Since the clutch mechanism 130 of the second embodiment has a similar structure and function to those of the clutch mechanism 30 of the first embodiment, the same parts will be omitted from the description below, and mainly different parts will be described.

First, as shown in fig. 16, the clutch mechanism 130 is provided at the lower end of the lever 32 extending downward from the drain valve water pressure driving portion 14, and is configured to connect the lower end of the lever 32 to the upper end of the valve shaft 12a of the drain valve 12 and to disconnect the lower end of the lever 32 from the upper end of the valve shaft 12a of the drain valve 12. The clutch mechanism 130 includes: a rotation shaft 130a mounted to the lower end of the lever 32; a hook member 130b supported by the rotation shaft 130 a; an engagement claw 30c provided at the upper end of the valve shaft 12 a; and a damper 130f defining an upper limit of a lift height of the clutch mechanism 130. With this structure, the clutch mechanism 130 is cut off at a predetermined timing and a predetermined lifting height, and the drain valve 12 is lowered.

The rotation shaft 130a is mounted to the lower end of the lever 32 so as to face in the horizontal direction, and is rotatably supported. The hook member 130b is a plate-like member, and its intermediate portion is rotatably supported by the rotation shaft 130 a. 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. In the hook member 130b, an upper end portion of the hook member 130b is formed to an upper side portion extending above the rotation shaft 130a, and an upper end portion 130e of the hook member 130b is formed to a length and a position that do not abut against a bottom surface of the drain valve water pressure driving portion 14 even in a state where the piston 14b is most lifted. In the hook member 130b, a lower portion extending downward from the rotation shaft 130a extends obliquely downward as a splayed lower portion, and then forms a hook portion 130d of the hook member 130b that returns toward the valve shaft 12 a. The engagement claw 30c provided at the upper end of the valve shaft 12a of the drain valve 12 is a plate-shaped claw. The bottom edge of the engaging claw 30c is formed to be substantially horizontal. The shutter 130f is formed so that the shutter 130f comes into contact with the bottom surface of the drain valve water pressure driving portion 14 before the upper end 130e of the hook member 130b in the connected state comes into contact with the bottom surface of the drain valve water pressure driving portion 14, and the lifting is stopped.

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

Referring back to fig. 16, the water accumulation portion and the like of the flush tank device 4 will be described.

The flush tank apparatus 104 further includes: a discharge unit 54 for discharging the supplied cleaning water; a water accumulation portion 156 for accumulating the washing water discharged from the discharge portion 54; a transmission unit 148 connected to the water accumulation unit 156; and an action portion 158 coupled to the transmission portion 148 and moving laterally.

The drain valve hydraulic pressure driving unit 14, the drain unit 54, the water accumulation unit 156, the transmission unit 148, and the acting unit 158 function as a valve control unit in whole or in part. The valve control unit is configured to be able to switch off the clutch mechanism 130 at a predetermined timing. The flush tank apparatus 104 includes such a valve control unit. When the first amount of washing water is selected by the remote control 6 or the like, the valve control unit operates to disconnect the clutch mechanism 130 when the first time elapses, and lowers the drain valve 12 when the first time elapses. When the second amount of washing water is selected by the remote control 6 or the like, the valve control unit operates to switch 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 unit is configured to operate by the supplied washing water.

The drain 54 drains the supplied washing water when the second amount of washing water is selected by the remote control 6. The drain 54 is configured to drain the washing water even when the first amount of washing water is selected by the remote control 6. The discharge portion 54 is formed at the lower end of the driving portion discharge path 34b and extends downward. The discharge portion 54 is provided above the upper surface of the housing 13. The drain 54 is disposed outside the housing 13 above the full water level WL. The discharge portion 54 forms a discharge port whose tip is thin and downward. Therefore, the washing water is accelerated downward by gravity, and the flow path is narrowed at the discharge port, so that the flow rate thereof is further accelerated. The drain 54 is disposed inside the sidewall of the water accumulation 156 and above the full water level WL.

At least a part of the water accumulation portion 156 is located above 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 portion 156 is located above the water stop level (full water level WL) of the water tank 10 in the standby state before the start of cleaning. The water accumulation portion 156 is formed in a hollow box shape, and an upper surface thereof is opened. The water accumulation portion 156 is disposed above the housing 13. The water accumulation portion 156 is disposed below the drain portion 54, and is configured to receive the washing water drained from the drain portion 54. The volume of the cleaning water that can be stored in the water storage portion 156 is smaller than the volume of the cylinder 14 a. The water accumulation portion 156 has a discharge hole 56b for discharging the accumulated cleaning water. The drain hole 56b is formed in a lower portion of the side wall 56c of the water accumulation portion 156, and is opened toward the opposite side of the valve shaft 12a of the drain 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 drain hole 56b to the outside of the water accumulation portion 156 (into the water reservoir 10) is smaller than the instantaneous flow rate A2 (see fig. 7) of the washing water discharged from the drain portion 54.

The transfer portion 148 forms a rod-like member extending downward in the vertical direction from the lower surface of the water accumulation portion 156. The transfer portion 148 is fixed to the lower surface of the water accumulation portion 156. The transfer portion 148 extends through the top surface of the housing 13 to the inside of the housing 13. The transmission portion 148 is not fixed to the housing 13, and is slidably disposed with respect to the housing 13. A spring 149 is disposed outside the transmission portion 148, and the spring 149 is fixed to the water accumulation portion 156 and the housing 13. Therefore, when the weight of the water accumulation portion 156 becomes light after the water accumulation portion 156 and the transmission portion 148 descend, the water accumulation portion 156 and the transmission portion 148 ascend again by the spring 149, returning to the standby position. The transmission portion 148 is coupled to the acting portion 158 via a rotatable transmission portion side rotation shaft 160. The transmission-section-side rotation shaft 160 rotatably supports the acting section 158 and the transmission section 148. The transmission unit side rotation shaft 160 extends in a direction perpendicular to the paper surface of fig. 16. The acting portion 158 further has a distal-side rotation shaft 162 that allows the distal side to rotate. The distal-side rotation shaft 162 rotatably supports the distal-side portion and the transmission-side portion of the acting portion 158. The distal-side rotation shaft 162 is also an axis extending in a direction perpendicular to the paper surface of fig. 16. The distal rotary shaft 162 is mounted to the housing 13 so as to be located on the virtual line B1 and to be movable along the virtual line B1. The virtual line B1 is substantially equal to the height of the rotation shaft 130a in the state where the drain valve 12 is lifted up most. Accordingly, the transmission portion 148 can move up and down in the same manner in accordance with the up and down movement of the water accumulation portion 156, and the action portion 158 can be pushed out or pulled back in the lateral direction.

The action portion 158 is formed to be movable in the left-right direction at a predetermined height below the bottom surface of the drain valve water pressure driving portion 14. The acting portion 158 moves laterally so as to advance toward the valve shaft 12a when the transmission portion 148 descends. The distal end 158a of the acting portion 158 is located in a space between the splayed hook members 130b in a state where the hook members 130b are lifted up to the highest position in the advanced state (see fig. 18). The acting portion 158 moves laterally so as to recede in a direction away from the valve shaft 12a when the transmission portion 148 is lifted. The tip 158a of the acting portion 158 is formed as a relatively large protruding portion having a semicircular cross section. The action unit 158 controls the timing of lowering the drain valve 12 so that the timing of closing the drain port 10a when the second amount of the cleaning water is selected is earlier than the timing of closing the drain port when the first amount of the cleaning water is selected, together with the operations of the transmission unit 148, the water accumulation unit 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 accumulation portion 156 and the transmission portion 148 are lowered. If the acting 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 water pressure driving portion 14 is stopped and the piston 14b moves downward, the upper end 130e of the hook member 130b contacts the acting portion 158, and the hook member 130b rotates to cut off the clutch mechanism 130.

Next, the operation of the flush tank apparatus 104 according to the second embodiment of the present invention and the flush toilet apparatus 1 provided with the flush tank apparatus 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 water tank 10 is at a 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 accumulation portion 156 does not accumulate the washing water, and the water accumulation portion 156 and the transmission portion 148 are biased upward by the spring 149. The acting portion 158 is pulled by the transmitting portion 148 to be located at a position retracted relative to the valve shaft 12 a. Next, when the user presses the large purge button of the remote control device 6 (fig. 1), the remote control device 6 transmits an instruction signal for executing the large purge mode to the controller 40 (fig. 16). Further, when the small purge button is pressed, an instruction signal for executing the small purge 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.

When receiving the instruction signal indicating that the large purge should be performed, the controller 40 operates the solenoid valve 18 (fig. 16) provided in the first control valve 16, and unseats the pilot valve 16d on the solenoid valve side from the pilot valve port. Thereby, the pressure in the pressure chamber 16c is reduced, 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 water pressure driving portion 14 via the first control valve 16. Thereby, the piston 14b of the drain valve hydraulic driving unit 14 is pushed up, the drain valve 12 is lifted up via the rod 32, and the wash water in the reservoir 10 is discharged from the drain port 10a to the toilet body 2. At this time, the pilot valve 16d is still in an open state, and the washing water flowing from the water supply pipe 38 is continuously supplied to the drain valve hydraulic driving portion 14 via the first control valve 16. The piston 14b is raised to the second position (the state of being pushed up most), and the driving portion water supply path 34a and the driving portion water discharge path 34b communicate via the inside of the cylinder 14a, so that the washing water is discharged from the discharge portion 54 to the water accumulation portion 156. Accordingly, after the drain valve 12 is lifted by the drain valve water pressure driving unit 14, the supply of the washing water from the first control valve 16 to the water accumulation unit 156 is started. Even in a state in which the drain valve 12 is raised and the shutter 130f is in contact with the bottom surface of the drain valve water pressure driving portion 14, the upper end 130e of the hook member 130b of the clutch mechanism 130 is not in contact with the bottom surface of the drain valve water pressure driving portion 14. Thus, the clutch mechanism 130 remains connected. Accordingly, the drain valve 12 is maintained in a lifted state. On the other hand, the supply of the washing water to the water accumulation portion 156 is started, and the water accumulation portion 156 and the transmission portion 148 gradually descend, whereby the acting portion 158 starts to move toward the 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 drive unit 14 is continued via the first control valve 16. The piston 14b of the drain valve hydraulic drive unit 14 is in the most pushed-up state, and the lever 32 and the clutch mechanism 130 are also in the most lifted state. Since the piston 14b is in the second position (most pushed up state), the drain valve hydraulic pressure driving unit 14 supplies the drain 54 with the washing water. The instantaneous flow rate A1 of the washing water discharged from the discharge hole 56b of the water accumulation portion 156 is smaller than the instantaneous flow rate A2 of the washing water discharged from the discharge portion 54, so that the water level of the washing water in the water accumulation portion 156 gradually rises. When the water level of the washing water in the water accumulation portion 156 becomes substantially the full water level in the water accumulation portion 156, the water accumulation portion 156 and the transmission portion 148 are lowered by the weight of the washing water. The acting portion 158 moves so as to protrude further laterally by the descent of the transmitting portion 148. The tip 158a of the acting portion 158 is located in a space between the hook members 130b that are stationary in the lifted-up highest state. The upper end 130e of the hook member 130b is located above the distal end 158a, and is separated from the distal end 158 a. Therefore, the clutch mechanism 130 is still not cut off and continues to be in the hold 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 turned off, the pilot valve 22c provided in the second control valve 22 is opened. Accordingly, the washing water is supplied from the second control valve 22 into the water tank 10 via 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. The washing water flowing from the water supply pipe 38 is still discharged from the discharge portion 54 to the water accumulation portion 156 via the first control valve 16 and the drain valve hydraulic pressure driving portion 14. Therefore, the amount of the cleaning water in the water accumulation portion 156 is not reduced, and the substantially full water level of the water accumulation portion 156 is maintained. Accordingly, the water accumulation portion 156 and the transmission portion 148 are in a lowered state, and the tip end portion 158a of the acting portion 158 is located in the space between the hook members 130 b.

Next, as shown in fig. 20, when the controller 40 selects the large purge mode, after a first time elapses from when the controller 40 opens the solenoid valve 18 (starts purging), the solenoid valve 18 is closed, and the first control valve 16 is closed. The timing (the lapse of the first time) at which the controller 40 closes the solenoid valve 18 is set in consideration of the following timing: as will be described later, the piston 14b starts to descend and the clutch mechanism 130 is cut off at a timing when the drain valve 12 is seated in the drain port 10a and the drain port 10a is closed when the water level in the water tank 10 decreases to the predetermined water level WL 1. The first control valve 16 closes, and thus the supply of the washing water to the drain valve hydraulic driving portion 14 and the drain portion 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water storage portion 156 until the water storage portion 156 is substantially full, and the water storage portion 156 is lowered by the weight of the washing water. Accordingly, the tip end 158a of the acting portion 158 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 driving unit 14 is stopped, the washing water in the cylinder 14a slowly flows out from the gap 14d, and the piston 14b is pushed down by the urging force of the spring 14c, and the rod 32 is lowered accordingly. Thus, the upper end 130e of the hook member 130b abuts against the distal end 158a, and the upper end 130e rotates counterclockwise about the rotation shaft 130 a. With this rotation, the lower side portion of the hook member 130b and the hook portion 130d are rotated in a lifted manner. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 130 is disconnected, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water tank 10 via the water supply path 50 is continued.

As shown in fig. 21, 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 drain valve 12 is held until the water level in the water storage tank 10 decreases from the full water level WL to the predetermined water level WL1, and the first flush water amount is discharged to the flush toilet body 2. Then, the washing water stored in the water accumulation portion 156 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water accumulation portion 156 is lowered. When the cleaning water in the water accumulation portion 156 is emptied or reduced, the water accumulation portion 156 and the transmission portion 148 rise again by the spring 149, and return to the standby position. Therefore, the acting portion 158 also moves backward in a direction away from the valve shaft 12a according to the upward movement of the transmission portion 48. The piston 14b is further lowered as the washing water in the cylinder 14a of the drain valve hydraulic driving unit 14 flows out.

The float switch 42 is still in the off state, and thus the valve-open state of the second control valve 22 is maintained, and water is continuously supplied to the water tank 10. The washing water supplied through the water supply channel 50 reaches the water supply channel branching portion 50a, and a part of the washing water branched at the water supply channel branching portion 50a flows into the overflow pipe 10b, and the remaining part is stored in the water storage tank 10. The washing water flowing into the overflow pipe 10b flows into the main body 2 for water supply to the bowl 2 a. In a state where the drain valve 12 is closed, the wash water flows into the water reservoir 10, whereby the water level in the water 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 the valve. Accordingly, the pilot valve 22c is in a valve-closed state, and therefore, the pressure in the pressure chamber 22b rises, and 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 urging 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 rotates to the original position by gravity when passing over the engagement claw 30c, the hook 130d is engaged with the engagement claw 30c again, the clutch mechanism 130 is connected, and the lever 32 and the valve shaft 12a are connected. Therefore, the standby state is restored before the toilet cleaning is started.

Next, the operation of the small cleaning 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 cleaning is the same as the large cleaning mode.

When receiving the instruction signal indicating that the small purge should be performed, the controller 40 operates the solenoid valve 18 provided in the first control valve 16 to open the first control valve 16. Then, the water accumulation portion 156 and the transmission portion 148 as shown in fig. 16, 17 to 19 are lowered, and the operation of the action portion 158 until the tip portion 158a is located 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 is described with reference to fig. 16, 17 to 19, and the operation in the large cleaning mode, and the description thereof is omitted.

Next, as shown in fig. 23, when the small purge mode is selected, the controller 40 opens the solenoid valve 18 (starts purging) and then closes the solenoid valve 18 and closes the first control valve 16 after a second time elapses. The second time is set to a time shorter than the first time. The timing (the elapse of the second time) at which the controller 40 closes the solenoid valve 18 is set in consideration of the following timing: as will be described later, the piston 14b starts to descend and the clutch mechanism 130 is cut off at a timing when the drain valve 12 is seated in the drain port 10a and the drain port 10a is closed when the water level in the water tank 10 decreases to the predetermined water level WL 2. The first control valve 16 closes, and thus the supply of the washing water to the drain valve hydraulic driving portion 14 and the drain portion 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water storage portion 156 until the water storage portion 156 is substantially full, and the water storage portion 156 is lowered by the weight of the washing water. Accordingly, the tip end 158a of the acting portion 158 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 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 urging force of the spring 14c, and the rod 32 is lowered accordingly. Thus, the upper end 130e of the hook member 130b abuts against the distal end 158a, and the upper end 130e rotates counterclockwise about the rotation shaft 130 a. With this rotation, the lower side portion of the hook member 130b and the hook portion 130d are rotated in a lifted manner. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 130 is disconnected, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water tank 10 via the water supply path 50 is continued.

As shown in fig. 24, the lowered drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. In this way, when the small flush mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 decreases from the full water level WL to the predetermined water level WL2, and the second flush water amount smaller than the first flush water amount is discharged to the flush toilet body 2. Then, the washing water stored in the water accumulation portion 156 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water accumulation portion 156 is lowered. When the cleaning water in the water accumulation portion 156 is emptied or reduced, the water accumulation portion 156 and the transmission portion 148 rise again by the spring 149, and return to the standby position. Accordingly, the acting portion 158 also moves backward in a direction away from the valve shaft 12a in response to the upward movement of the transmission portion 148. The piston 14b is further lowered as the washing water in the cylinder 14a of the drain valve hydraulic driving unit 14 flows out.

The float switch 42 is still in the off state, and thus the valve-open state of the second control valve 22 is maintained, and water is continuously supplied to the water tank 10. The washing water supplied through the water supply channel 50 reaches the water supply channel branching portion 50a, and a part of the washing water branched at the water supply channel branching portion 50a flows into the overflow pipe 10b, and the remaining part is stored in the water storage tank 10. The washing water flowing into the overflow pipe 10b flows into the main body 2 for water supply to the bowl 2 a. In a state where the drain valve 12 is closed, the wash water flows into the water reservoir 10, whereby the water level in the water reservoir 10 rises. After that, when the water level in the water tank 10 rises to a 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 that in the large cleaning mode as shown in fig. 22, and therefore, the description thereof is omitted.

According to the flush tank device 4 of the second embodiment of the present invention described above, the drain valve 12 and the drain valve water pressure driving unit 14 are coupled by the clutch mechanism 130, and the clutch mechanism 130 is cut off at a predetermined timing, so that the drain valve 12 can be moved and the drain valve 12 can be closed regardless of the operation speed of the drain valve water pressure driving unit 14. When the first amount of the washing water is selected by the remote control device 6, the valve control unit operates to switch off the clutch mechanism 130 when the first time elapses, and lowers the drain valve 12 when the first time elapses, and when the second amount of the washing water is selected by the remote control device 6, the valve control unit operates to switch off the clutch mechanism 130 when the second time shorter than the first time elapses, and lowers the drain 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 switch off the clutch mechanism 130 so that the timing at which the drain port 10a is closed is earlier than when the first amount of cleaning water is selected. Therefore, according to an embodiment of the present invention, the first and second amounts of cleaning water can be set by lowering the drain valve 12 by the lapse of 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 applied to the first or second embodiments. For example, in the second embodiment described above, the acting 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 lever member of the piston cylinder may advance toward the valve shaft 12a, and the clutch mechanism 130 may be cut off by the lever member at an arbitrary timing. According to such a configuration, the cylinder portion of the piston cylinder is connected to the water supply passage 50 extending from the second control valve 22, and the rod member is pressed by the cleaning water supplied into the cylinder portion to move. The lever member is formed to move laterally toward the valve shaft below the bottom surface of the drain valve water pressure driving portion 14. The top end 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 driving portion. The T-shaped portion is formed in a flat plate shape extending in the longitudinal direction. The upper end 130e of the hook member 130b hits the upper end of the T-shape, the clutch mechanism 130 is cut off, and the drain valve 12 is lowered.

When the controller 40 selects the large purge mode, after a first time elapses from when the controller 40 opens the solenoid valve 18 (starts purging), the solenoid valve 24 is opened, and the second control valve 22 is opened. Thereby, the cleaning 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 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 lapse of the first time) at which the controller 40 opens the solenoid valve is set in consideration of the following timing: when the water level in the water reservoir drops to the predetermined water level WL1, the drain valve 12 is seated in the drain port 10a, and the drain port is closed, and the lever member abuts against the hook member 130b, so that the clutch mechanism 130 is turned off. Thereby, the drain valve 12 can be lowered, and the large washing mode for discharging the first amount of washing water can be performed.

When the small purge mode is selected, the controller 40 opens the solenoid valve 24 and opens the second control valve 22 after a second time shorter than the first time elapses from the opening of the solenoid valve 18 (the start of purging) by the controller 40. Thereby, the cleaning 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 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 lapse of the second time) at which the controller 40 opens the solenoid valve is set in consideration of the following timing: as will be described later, when the water level in the water tank 10 is reduced to the predetermined water level WL2, the drain valve 12 is seated in the drain port 10a, and the lever member is brought into contact with the hook member so that the drain port is closed, and the clutch mechanism 130 is cut off. Thereby, the drain valve 12 can be lowered, and the small washing mode of discharging the second amount of washing water can be performed.

For example, in the second embodiment described above, the acting 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 washing water may be discharged from the discharge portion toward the clutch mechanism 130, and the clutch mechanism 130 descends at an arbitrary timing and is cut off by the discharged washing water. The clutch mechanism 130 is configured so that the clutch mechanism 130 is not cut off only by lifting the drain valve 12, as in the second embodiment. When the supply of the washing water to the drain valve water pressure driving unit 14 is stopped and the piston 14b moves downward, the clutch mechanism 130 gradually descends in the connected state. At a position lowered below the highest lifting position, for example, the hook member 130b of the clutch mechanism 130 rotates due to 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 driving unit 14, and the discharge unit function as a valve control unit. The valve control unit is configured to be able to switch off the clutch mechanism 130 at a predetermined timing. The flush tank device 4 includes such a valve control unit. When the first amount of the 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 after the lapse of the first time, and lowers the drain valve 12 after the lapse of the first time. Therefore, the drain valve 12 can be lowered at a timing corresponding to the original predetermined water level WL1, and the large washing mode can be executed. When the second amount of the washing water is selected by the remote control device 6 or the like, the valve control unit operates to cause the washing water to be discharged from the discharge unit to act on the clutch mechanism 130 when a second time shorter than the first time elapses, and to shut off the clutch mechanism 130, and to cause the drain valve 12 to descend when the second time elapses. Therefore, the drain valve 12 can be lowered at a timing corresponding to the original predetermined water level WL2, and the small washing mode can be executed. The above-described modifications are exemplified, but the structure of each modification, 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 portion 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 portion 48 presses the upper surface of the float device.

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

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

Here, the drain portion 54 continues to drain for a predetermined period of time, so that the transmission portion 48 does not operate to push down the float device, and the float device is lowered in association with the water level (WL 1) in the water 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 prescribed water level WL1, and the large washing mode can be performed.

When the small purge mode is selected, the controller 40 causes the solenoid valve 18 to continue to open. Accordingly, the washing water flowing from the water supply pipe 38 is still discharged from the discharge portion 54 to the water accumulation portion 56 via the first control valve 16 and the drain valve hydraulic pressure driving portion 14. Therefore, the water level in the water accumulation portion 56 is high, the float is in a floating position, and the holding mechanism 46 is in a holding state. Next, when the small purge mode is selected, the controller 40 opens the solenoid valve 18 (starts purging) and then closes the solenoid 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 elapse of the second time) at which the controller 40 closes the solenoid valve 18 is set in consideration of the following timing: as will be described later, the cleaning water in the water accumulation portion 56 is lowered, and the float 26 is lowered at a timing such that the drain valve 12 is seated in the drain port 10a when the water level in the water reservoir 10 is lowered to the predetermined water level WL2, and the drain port 10a is closed. The washing water stored in the water accumulation portion 56 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water accumulation portion 56 is lowered. When the water level of the washing water in the water accumulation portion 56 decreases to a predetermined water level WL4 (a water level substantially equal to the predetermined water level WL 3) (in this case, the water level in the water tank 10 corresponds to the water level decreased to the predetermined water level WL 2), the positions of the transmission portion 48 and the float 26 decrease. Thereby, the float is pressed down, and the holding mechanism 46 shifts to the non-holding state. Thereby, the drain valve 12 can be lowered, and the small washing mode of discharging the second amount of washing water can be performed.

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 accumulation portion 56, in the standby state, the water accumulation portion 56 is not accumulated with the washing water, the washing water is supplied to the water accumulation portion 56 through the drain portion 54, the float 26 is lifted, and the transmission portion 48 is lifted. In this case, a seesaw-type force transmission device (see-saw-shaped transmission portion) having a shape in which the letter Z is tilted 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 lifted up, the other end of the force transmission device is lowered like a teeterboard, and an action portion provided at the other end acts on the clutch mechanism 30. One end of the force transmitting means forms a transmitting portion 48 and the other end of the force transmitting means forms an acting portion acting on the clutch mechanism 30. Therefore, the operating portion can be lowered on the opposite side of the seesaw-shaped force transmission tool by the raising of the float 26, and act on the clutch mechanism 30, thereby switching off the clutch mechanism 30 in advance. In this case, instead of the structure in which the discharge portion 54 is connected to the driving portion water discharge 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 accumulation portion 56 at an arbitrary timing without passing through the drain valve water pressure driving portion 14.

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

When the small washing mode is selected, the controller 40 can open the second control valve 22 at a predetermined timing to supply the washing water from the drain of the water supply path 50 to the water accumulation portion 56, raise the float 26 in the water accumulation portion 56, lower the operation portion, and switch off the clutch mechanism 30 in advance. The small washing mode of discharging the second amount of washing water can be performed by turning off the clutch mechanism 30 in advance while the drain valve 12 is lowered in advance.

In the case where the structure in which the acting portion acts on the clutch mechanism 30 is adopted as in the modification described above, as a further modification, the flush tank device 4 may be provided with a float device for the large flush mode and a float device for the small flush mode, respectively. For example, the action portion acting on the clutch mechanism 30 may be a plate formed in a T shape at the tip of a rod extending in the lateral direction, and the clutch mechanism 30 may be cut off by the plate.

In the flush tank device 4 having such a structure, when the large flush mode is selected, the controller 40 is configured not to discharge the flush water from the discharge portion 54 of the water supply passage 50 to the accumulation portion 56 until at least the float device for the large flush mode is lowered by the water level at which the water level in the reservoir 10 reaches the predetermined water level WL1, and not to raise the float 26 and the transmission portion 48, and the application portion does not switch off the clutch mechanism 30 in advance. Accordingly, the clutch mechanism 30 is disconnected as originally prescribed, and the drain valve 12 is held by the holding mechanism 46 connected to the float device for the large cleaning mode. Thereafter, the drain valve 12 can be lowered at a timing corresponding to the predetermined water level WL1 by the operation of the float device for the large purge mode, and the large purge mode can be executed.

When the small washing mode is selected, the controller 40 causes the washing water to be discharged from the discharge portion 54 to the water accumulation portion 56, and causes the float 26 and the transmission portion 48 to rise, and the acting portion switches off the clutch mechanism 30 in advance. The float 26 in the water accumulation portion 56 can laterally act on the lever of the acting portion with the rise of the float 26, and the clutch mechanism 30 is turned off at a relatively early timing. By thus forming, the height at which the drain valve 12 is raised (the height at which the clutch mechanism 30 is cut off) can be adjusted to a lower position, and in the small washing mode, the clutch mechanism 30 is cut off in advance so that the drain valve 12 is held by the holding mechanism 46 connected to the float device for the small washing mode, thereby achieving the small washing mode.

As a further modification, a teeter-totter type force transmission device as described above may be provided between the float 26 and the float device for the large cleaning mode, instead of the structure in which the acting portion acts on the clutch mechanism 30 as in the modification described above. A rotation center shaft is provided at the center of the force transmission device, and when the transmission portion 48 at one end of the force transmission device is lifted up, the lever portion at the other end of the force transmission device is lowered like a teeter-totter, and the lever portion presses down the float device for the large cleaning mode. According to this configuration, the transmission portion 48 can be raised by the raising of the float 26, and the lever portion on the opposite side of the seesaw-shaped force transmission device of the action portion can be lowered to press down the float device, and the holding mechanism 46 extending from the float device for the large cleaning mode is placed in the non-holding state.

In addition to this structure, when the large cleaning mode is selected, the controller 40 is configured so that the cleaning water is not discharged from the discharge portion 54 to the water accumulation portion 56, the float 26 and the transmission portion 48 are not lifted, and the lever portion does not push down the float device for the large cleaning mode. Therefore, the float device for the large purge mode can be operated according to the predetermined water level WL1 as originally set, and the drain valve 12 is lowered at a predetermined timing to execute the large purge 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 accumulation unit 56, and causes the float 26 and the transmission unit 48 to rise, and the lever presses 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 cleaning mode is released and the float device 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 washing mode. Then, the float device for the small purge mode is lowered at a timing corresponding to the predetermined water level WL2, and the holding mechanism 46 of the float device for the small purge mode is brought into a non-holding state, so that the drain valve 12 is lowered, and the small purge mode for discharging the second amount of the purge water can be executed.

The above-described modifications are exemplified, but the structure of each modification and the structure of the first embodiment may be changed by any combination or extraction.

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

The flush toilet apparatus 1 according to the third embodiment is different from the second embodiment in that the clutch mechanism 230 is disposed outside the drain valve housing 213. Only the points of the third embodiment of the present invention that differ from the second embodiment will be described, and the same reference numerals will be attached to the same parts in the drawings, and the description will be omitted. Fig. 25 is a cross-sectional view showing a schematic configuration of a flush tank apparatus according to a third embodiment of the present invention.

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

The flush tank device 204 supplies flush water to the flush toilet main body 2. The flush tank device 204 has a drain valve water pressure driving section 214 that drives the drain valve 12.

The flush tank device 204 has a clutch mechanism 230 for lowering the drain valve 12 by being disconnected, and the clutch mechanism 230 connects the drain valve 12 to the drain valve hydraulic driving unit 214, and lifts the drain valve 12 by the driving force of the drain valve hydraulic driving unit 214.

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

The drain valve water pressure driving unit 214 is configured to drive the drain valve 12 by using the water supply pressure of the washing water supplied from the tap water pipe. Specifically, the drain valve water pressure driving unit 214 includes: a cylinder 14a into which the 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 drain valve 12. The drain valve water pressure driving portion 214 is a horizontally disposed drain valve water pressure driving portion that horizontally drives the piston 14b and the rod 232. The drain valve water pressure driving unit 214 is disposed apart from the drain valve housing 213 on the outside of the drain valve housing 213, and the drain valve 12 is disposed on the inside of the drain valve housing 213.

A spring 14c is disposed in the cylinder tube 14a, and biases the piston 14b laterally toward the first end 14g on the drain valve 12 side. Further, a seal 14e is attached 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 230 is provided at the other end of the lever 232, and the lever 232 is coupled to a coupling member 270 coupled to the valve shaft 12a of the drain valve 12 by the clutch mechanism 230, whereby the coupling between the lever 232 and the coupling member 270 is released.

The cylinder tube 14a is a cylindrical member whose axis 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 driving portion water supply passage 34a is connected to the first end 14g of the cylinder 14a on the drain valve 12 side, and the washing water flowing out from the first control valve 16 flows into the cylinder 14 a. Accordingly, the piston 14b in the cylinder 14a is driven laterally from the first end 14g toward the second end 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 the upper portion of the cylinder tube 14a, and the driving portion drain passage 34b communicates with the inside of the cylinder tube 14a via the outflow hole. Therefore, when the washing water flows into the cylinder 14a from the driving portion water supply path 34a connected to the cylinder 14a, the piston 14b is pushed from the first end 14g side portion of the cylinder 14a as the first position toward the second end 14h. The piston 14b is driven by the pressure of the washing water flowing into the cylinder. Then, when the piston 14b is pushed to the second position on the second end 14h side of the outflow hole, the water flowing into the cylinder 14a flows out from the outflow hole through the driving portion drain passage 34 b. That is, when the piston 14b moves to the second position, the driving portion water supply passage 34a and the driving portion water discharge passage 34b communicate via the inside of the cylinder 14 a. A discharge portion 54 is formed at the tip end portion of the driving portion discharge passage 34b extending from the cylinder tube 14 a. In this way, the driving portion drain passage 34b forms a flow path extending to the drain portion 54.

The rod 232 is a rod-shaped member connected to the side surface of the piston 14b on the drain valve 12 side, 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 is also connected to the clutch mechanism 230 outside the cylinder 14 a. 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 of the gap 14 d. The water flowing out of the gap 14d flows into the water reservoir 10. Since the gap 14d is narrow and the flow path resistance is large, even when water flows out of the gap 14d, the pressure in the cylinder 14a increases due to the washing water flowing into the cylinder 14a from the driving portion water supply path 34a, and the piston 14b is pushed toward the second end portion 14h against the urging force of the spring 14 c.

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

The float switch 42 is disposed in the water tank 10, and is configured to stop the supply of water from the first control valve 16 to the drain valve water pressure driving unit 214 when the water level in the water tank 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 construction and operation principle as the clutch mechanism 130 in the second embodiment. The difference between them is that: the clutch mechanism 230 in the third embodiment is a lateral clutch mechanism provided laterally at an end of a laterally extending rod 232, whereas the clutch mechanism 130 in the second embodiment is a longitudinal clutch mechanism provided longitudinally at an end of a longitudinally extending rod 32. The clutch mechanism 230 of the third embodiment is substantially the same structure as the clutch mechanism 130 of the second embodiment except that it is assembled laterally and moved laterally, and therefore, a description of common parts will be omitted and a description of different parts will be mainly described.

First, as shown in fig. 25, the clutch mechanism 230 is provided at an end of the lever 232 extending laterally from the drain valve hydraulic drive unit 214, and is configured to connect an end of the lever 232 on the drain valve side to an upstream end of the connecting member 270 and to disconnect an end of the lever 232 on the drain valve side to an upstream end of the connecting member 270. The clutch mechanism 230 moves in the lateral direction to form a lateral clutch mechanism, that is, a clutch mechanism connecting portion 272 connecting the lever 232 to a laterally aligned position in the lateral direction and releasing the connection of the lever 232 to the clutch mechanism connecting portion 272. More specifically, the clutch mechanism 230 is formed such that the lever 232 is laterally separated from the clutch mechanism connecting portion 272 or such that the lever 232 is laterally engaged with the clutch mechanism connecting portion 272 by movement of the hook member 130b described later. The clutch mechanism 230 is disposed at approximately the same height as the lever 232. The clutch mechanism 230 has: a rotation shaft 130a mounted to a lower end of the rod 232; a hook member 130b supported by the rotation shaft 130 a; an engagement claw 30c described later provided at an end portion of the clutch mechanism connecting portion 272 on the clutch mechanism side; and a shutter 130f defining an upper limit of the lift position of the clutch mechanism 230. With this structure, the clutch mechanism 230 is cut off at a predetermined timing and a predetermined lift height (lift height of the drain valve 12), and the drain valve 12 is lowered.

The hook member 130b is formed to spread upward from the rotation shaft 130a in a splayed shape. In the hook member 130b, the drain valve water pressure driving portion side end 130e of the hook member 130b is formed on the drain valve water pressure driving portion side extending from the rotation shaft 130a toward the drain valve water pressure driving portion side, and the drain valve water pressure driving portion side end 130e of the hook member 130b is formed in a length and a position that 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 lifted (pushed-in state). In the hook member 130b, a drain valve side portion extending from the rotation shaft 130a to the drain valve side extends obliquely upward as a splayed portion, and then, a hook portion 130d of the hook member 130b returning toward the clutch mechanism connecting portion 272 is formed. 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 shutter 130f is formed so that the shutter 130f comes into contact with the bottom surface of the drain valve water pressure driving portion 214 before the drain valve water pressure driving portion side end 130e of the hook member 130b in the connected state comes into contact with the bottom surface of the drain valve water pressure driving portion 214, and the lifting of the drain valve 12 and the like is stopped.

In the state shown in fig. 25, the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. In this state, the drain valve water pressure driving unit 214 is coupled to the drain valve 12, and in this coupled state, the hook 130d of the hook member 130b engages with the bottom edge of the engagement claw 30c, and the drain 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, the action portion 258, and the like, which will be described later, may function as a timing control mechanism.

The clutch mechanism 230 is disposed between the drain valve water pressure driving portion 214 and the drain valve housing 213 (or the drain valve 12) on the drain valve water pressure driving portion 214 side. For example, the clutch mechanism 230 is disposed closer to the drain valve water pressure driving portion 214 than a position of half of the length of the lever 232 and the connecting member 270 from the drain valve water pressure driving portion 214 to the drain valve housing 213 (or the drain valve 12) in the standby state. The clutch mechanism 230 is disposed closer to the drain valve water pressure driving portion 214 than the end of the flexible member 274 on the drain valve water pressure driving portion side. The clutch mechanism 230 is disposed closer to the drain valve water pressure driving portion 214 than the end of the clutch mechanism connection portion 272 closer to the drain valve water pressure driving portion.

The clutch mechanism 230 is disposed between the drain valve water pressure driving portion 214 and the drain valve housing 213 on the drain valve water pressure driving portion 214 side, and therefore, the degree of freedom in setting the position of the shut-off clutch mechanism 230, the degree of freedom in the position of the clutch mechanism 230, and the degree of freedom in the structure of the clutch mechanism 230 can be improved as compared with the case of being disposed on the drain valve housing 213 side near the water surface. Further, the degree of freedom in the arrangement position of the operating portion 258 and the like of the cut-off clutch mechanism 230, and the degree of freedom in the structure of the operating portion 258 and the like can be improved. The distance between the drain valve water pressure driving unit 214 and the clutch mechanism 230 in the standby state is set to be shorter than the distance between the drain valve housing 213 (or the drain valve 12) and the clutch mechanism 230 in the standby state. The height difference between the drain valve water pressure driving unit 214 and the clutch mechanism 230 in the standby state is set to be 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 connection member 270 is longer than the rod 232. The connection member 270 includes: a clutch mechanism connection portion 272 connected to the clutch mechanism 230; and a flexible member 274 formed of a wire connecting the clutch mechanism connection portion 272 and the valve shaft 12 a. The clutch mechanism connection 272 extends along the same axis as the lever 232. The clutch mechanism connecting portion 272 is formed in a bar shape having rigidity. The clutch mechanism connecting portion 272 is formed with an engaging claw 30c.

The flexible member 274 is disposed within a tube 276 extending from the drain valve housing 213. The flexible member 274 can be deformed along the shape of the tube 276. The flexible member 274 is configured to bend along the shape of the curved tube 276. When one end portion of the flexible member 274 is moved by a certain amount of movement, the other end portion is moved by the same certain amount of movement. In this way, the flexible member 274 transmits the lifting operation from one end portion or the pulling operation from the other end portion as the lifting operation of the other end portion or the pulling operation of the one end portion. The flexible member 274 can be connected to each other so as not to depend on the arrangement positions of the drain valve water pressure driving unit 214 and the drain valve 12, and can transmit a lifting operation or the like. This allows the drain valve water pressure driving unit 214 and the drain valve 12 to be arranged at more free positions. The flexible member 274 may be formed from other connecting members such as a chain, ball chain, or the like.

Referring back to fig. 25, the water accumulation portion and the like of the flush tank device 204 will be described.

The flush tank apparatus 204 further includes: a discharge unit 54 for discharging the supplied cleaning water; a water accumulation portion 156 for accumulating the washing water discharged from the discharge portion 54; a transmission unit 248 connected to the water accumulation unit 156; and an action portion 258 coupled to the transmission portion 248 and longitudinally movable.

The drain valve hydraulic pressure driving unit 214, the drain unit 54, the water accumulation unit 156, the transmission unit 148, and the acting unit 158 function as a valve control unit in whole or in part. The valve control unit is configured to be able to switch off the clutch mechanism 230 at a predetermined timing. In this case, the clutch mechanism 230 can function as a timing control mechanism. The flush tank apparatus 204 includes such a valve control unit. When the first amount of washing water is selected by the remote control 6 or the like, the valve control unit operates to switch off the clutch mechanism 230 when the first time elapses, and lowers the drain valve 12 when the first time elapses. When the second amount of washing water is selected by the remote control 6 or the like, the valve control unit operates to switch 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 unit is configured to operate by the supplied washing water.

The valve control unit is not limited to the above-described water supply type valve control unit, and may be an electrically driven type valve control unit in which the water accumulation unit 156, the action unit 158, and the like are driven by the washing water supplied to the water accumulation unit 156, that is, the action unit 158 and the like are driven by an electrically driven driving unit without the water accumulation unit 156, or may be a physical type valve control unit in which the clutch mechanism is cut off at a predetermined timing by applying a force to the action unit 158 and the like in the direction of cutting off the clutch mechanism by a physical structure such as a spring without using a unit such as an electrically driven unit.

The drain 54 drains the supplied washing water when the second amount of washing water is selected by the remote control 6. The drain 54 is configured to drain the washing water even when the first amount of washing water is selected by the remote control 6. The discharge portion 54 is formed at the lower end of the driving portion discharge path 34b and extends downward. The drain portion 54 is provided above the upper surface of the drain valve housing 213. The drain portion 54 is disposed outside the drain valve housing 213. The discharge portion 54 forms a discharge port whose tip is thin and downward. Therefore, the washing water is accelerated downward by gravity, and the flow path is narrowed at the discharge port, so that the flow rate thereof is further accelerated. The drain 54 is disposed inside the sidewall of the water accumulation 156 and above the full water level WL.

The water accumulation portion 156 is disposed above the drain valve housing 213. The drain 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 downward in the vertical direction from the lower surface of the water accumulation portion 156. The transmission portion 248 is fixed to the lower surface of the water accumulation portion 156. The transmission portion 248 is not fixed to the rod 232, and is slidably disposed with respect to the rod 232. A spring 249 is disposed outside the transmission portion 248, and the spring 249 is provided between the water accumulation portion 156 and the drain valve water pressure driving portion 214. Therefore, when the weight of the water accumulation portion 156 becomes light after the water accumulation portion 156 and the transmission portion 248 descend, the water accumulation portion 156 and the transmission portion 248 ascend again by the spring 249, and return to the standby position. The transmitting portion 248 is coupled to the acting portion 258. The transmission unit 248 can move up and down in the same manner as the water accumulation unit 156 moves up and down, and the action unit 258 moves up and down. In this way, the transmission portion 248 and the action portion 258 move up and down along the virtual line B2.

The action portion 258 is formed to be movable in the up-down direction at a position on the side of the first end portion 14g of the bottom surface of the drain valve water pressure driving portion 214 and on the upper side of the lever 232. In fig. 25, the position of the operation portion 258 in the standby state is shown by a solid line, and the operation portion 258 in a state of being moved downward toward the lever 232 is shown by a virtual line B3. The action portion 258 moves downward in such a manner as to advance toward the rod 232 when the transmission portion 248 descends. The tip end portion 258a of the acting portion 258 can be located in a space between the splayed hook members 130b in a state where the hook members 130b are most lifted (a state where the hook members are most advanced toward the drain valve water pressure driving portion 214 side) in a state where the hook members are advanced. The action portion 258 moves upward so as to recede in a direction away from the lever 232 when the transmission portion 248 is lifted. The tip end portion 258a of the working portion 258 is formed as a relatively large protruding portion having a semicircular cross section. The action portion 258 controls the timing of lowering the drain valve 12 so that the timing of closing the drain port 10a when the second amount of the cleaning water is selected is earlier than the timing of closing the drain port when the first amount of the cleaning water is selected, together with the operations of the transmission portion 248, the water accumulation portion 156, and the like.

The action portion 258 extends to the lever 232 side of the drain valve water pressure driving portion side end 130e of the hook member 130b in a state where the water accumulation portion 156 and the transmission portion 248 are lowered. If the acting 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 water pressure driving portion 214 is stopped and the piston 14b moves toward the drain valve, the drain valve water pressure driving portion side end 130e of the hook member 130b contacts the action portion 258 with the movement of the lever 232, and the hook member 130b rotates to cut off the clutch mechanism 230.

As a modification, a case will be described in which a physical valve control unit is configured instead of the water supply type valve control unit according to the present embodiment.

In this modification, instead of the drain portion 54 and the water accumulation portion 156 of the flush tank device 204, the flush tank device 204 includes: a spring type transmission part formed by a spring fixed in the water storage tank 10; and an action part connected with the spring type transmission part and longitudinally moving. At this time, the drain valve water pressure driving unit 214, the spring type transmission unit, and the acting unit function as a valve control unit in all or part thereof. The valve control unit is configured to be able to switch 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 modification described above is disposed above the drain valve housing 213. The spring-type transmission portion 248 is disposed above the rod 232. A spring type transmission portion 248 is fixed above the rod 232 and extends downward. The spring-like transmission portion forms a spring-like member extending downward in the vertical direction. The action part is fixed at the lower end of the spring type transmission part. The spring type transmission portion is not fixed to the rod 232, and is disposed slidably in the up-down direction with respect to the rod 232. When the hook member 130b of the clutch mechanism 230 acts on an inclined surface of the acting portion, which will be described later, from the drain valve side, the spring transmission portion can receive a relatively large upward force from the inclined surface and expand and contract upward, so that a relatively large load is not applied to the hook member 130b and is retracted. 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 transmission portion can receive a relatively large amount of force from the vertical surface in the lateral direction, and is hard to expand and contract upward, and a relatively large load acts on the hook member 130b, whereby the hook member 130b is rotated, and the clutch mechanism 230 is cut off. The spring transmission portion returns to its natural length and returns to the standby position without receiving the force from the hook member 130 b.

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

The action portion in the modification described above is extended to the side of the lever 232 than the drain valve water pressure driving portion side end 130e of the hook member 130b in a standby state where the spring transmission portion returns to the natural length after the hook member 130b temporarily pushes up the inclined surface of the action portion and advances to the drain valve water pressure driving portion 214 side. If the acting portion 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 water pressure driving portion 214 is stopped and the piston 14b moves toward the drain valve, the drain valve water pressure driving portion side end 130e of the hook member 130b contacts the vertical surface of the acting portion with the movement of the lever 232, and the hook member 130b rotates to cut off the clutch mechanism 230.

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

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

First, in the standby state of toilet cleaning shown in fig. 25, the water level in the water tank 10 is at a 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 accumulation portion 156 does not accumulate the washing water, and the water accumulation portion 156 and the transmission portion 248 are biased upward by the spring 249. The action portion 258 is pulled by the transmission portion 248 to be located at a retreated position with respect to the lever 232. Next, when the user presses the large purge button of the remote control device 6, the remote control device 6 transmits an instruction signal for executing the large purge mode to the controller 40. Further, when the small purge button is pressed, an instruction signal for executing the small purge 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 indicating that the large purge should be performed, the controller 40 operates the solenoid valve 18 provided in the first control valve 16, and unseats the pilot valve 16d on the solenoid valve side from the pilot valve port. When the first control valve 16 is opened, the washing water flowing from the water supply pipe 38 is supplied to the drain valve water pressure driving portion 214 via the first control valve 16. Thereby, the piston 14b of the drain valve hydraulic driving unit 214 is pushed in, the drain valve 12 is lifted up via the rod 232, and the wash water in the reservoir 10 is discharged from the drain port 10a to the toilet body 2. At this time, the pilot valve 16d is still in an open state, and the washing water flowing from the water supply pipe 38 is continuously supplied to the drain valve hydraulic driving portion 214 via the first control valve 16. The piston 14b moves to the second position (the state in which the piston is most pushed toward the second end portion 14h side), and the driving portion water supply path 34a and the driving portion water discharge path 34b communicate with each other through the inside of the cylinder 14a, so that the washing water is discharged from the discharge portion 54 to the water accumulation portion 156. Accordingly, after the drain valve 12 is lifted by the drain valve water pressure driving unit 214, the supply of the washing water from the first control valve 16 to the water accumulation unit 156 is started. Even in a state in which the lever 232 moves toward the drain valve water pressure driving portion side due to the movement of the piston 14b and the lever 232 and the shutter 130f is in contact with the bottom surface of the drain valve water pressure driving portion 214, the drain valve water pressure driving portion side end 130e of the hook member 130b of the clutch mechanism 230 is not in contact with the bottom surface of the drain valve water pressure driving portion 214. Thus, the clutch mechanism 230 remains connected. Accordingly, the drain valve 12 is maintained in a lifted state. On the other hand, the supply of the washing water to the water accumulation portion 156 is started, and the water accumulation portion 156 and the transmission portion 248 gradually descend, whereby the action portion 258 starts to descend toward the hook member 130b on the lever 232 side. The controller 40 keeps the second control valve 22 closed.

As shown in fig. 18 and 25, the supply of the washing water to the drain valve hydraulic pressure driving portion 214 is continued via the first control valve 16. The piston 14b of the drain valve hydraulic driving unit 214 is in a state of being pushed up most (pushed-in state), and the lever 232 and the clutch mechanism 230 are also in a state of being lifted up most. Since the piston 14b is in the second position (most pushed up), the drain valve hydraulic pressure driving unit 214 supplies the drain 54 with the washing water. When the water level of the washing water in the water accumulation portion 156 becomes substantially the full water level in the water accumulation portion 156, the water accumulation portion 156 and the transmission portion 248 are lowered by the weight of the washing water. The action portion 158 descends toward the rod 232 due to the descent of the transmission portion 248. The tip end portion 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 driving portion side end 130e of the hook member 130b is located above the tip end 258a, and is separated from the tip end 258 a. Accordingly, the clutch mechanism 230 remains unset and remains in the hold state.

Next, as shown in fig. 19 and 25, 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 turned off, the pilot valve 22c provided in the second control valve 22 is opened. Accordingly, the washing water is supplied from the second control valve 22 into the water tank 10 via 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. The washing water flowing from the water supply pipe 38 is still discharged from the discharge portion 54 to the water accumulation portion 156 via the first control valve 16 and the drain valve hydraulic pressure driving portion 14. Therefore, the amount of the cleaning water in the water accumulation portion 156 is not reduced, and the substantially full water level of the water accumulation portion 156 is maintained. Accordingly, the water accumulation portion 156 and the transmission portion 248 are in a lowered state, and the tip end portion 258a of the action portion 258 is located in the space between the hook members 130 b.

Next, as shown in fig. 20, 25, and the like, when the controller 40 selects the large purge mode, after a first time elapses from when the controller 40 opens the solenoid valve 18 (starts purging), the solenoid valve 18 is closed, and the first control valve 16 is closed. The timing (the lapse of the first time) at which the controller 40 closes the solenoid valve 18 is set in consideration of the following timing: as will be described later, the piston 14b starts to descend and the clutch mechanism 230 is cut off at a timing when the drain valve 12 is seated in the drain port 10a and the drain port 10a is closed when the water level in the water tank 10 decreases to the predetermined water level WL 1. The first control valve 16 closes, and thus the supply of the washing water to the drain valve hydraulic driving portion 214 and the drain portion 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water storage portion 156 until the water storage portion 156 is substantially full, and the water storage portion 156 is lowered by the weight of the washing water. Accordingly, 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 water pressure driving unit 214 is stopped, the washing water in the cylinder 14a slowly flows out from the gap 14d, and the piston 14b is pressed by the urging force of the spring 14c, and the rod 232 moves to the right side of the paper surface and moves to the drain valve side. Thus, the drain valve water pressure driving portion side end 130e of the hook member 130b abuts against the tip end 258a, and the drain valve water pressure driving portion side end 130e rotates counterclockwise about the rotation shaft 130 a. With this rotation, the lower side portion of the hook member 130b and the hook portion 130d are rotated in a lifted manner (refer to fig. 20). Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 230 is cut off, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water tank 10 via the water supply path 50 is continued.

As shown in fig. 21, 25, and the like, the 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 drain valve 12 is held until the water level in the water storage tank 10 decreases from the full water level WL to the predetermined water level WL1, and the first flush water amount is discharged to the flush toilet body 2. Then, the washing water stored in the water accumulation portion 156 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water accumulation portion 156 is lowered. When the cleaning water in the water accumulation portion 156 is emptied or reduced, the water accumulation portion 156 and the transmission portion 248 rise again by the spring 249, and return to the standby position. Therefore, the working portion 258 also moves backward in a direction away from the lever 232 according to the rising of the transmission portion 248. The piston 14b moves back toward the drain valve side in association with the outflow of the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14.

The float switch 42 is still in the off state, and thus the valve-open state of the second control valve 22 is maintained, and water is continuously supplied to the water tank 10. The washing water supplied through the water supply channel 50 reaches the water supply channel branching portion 50a, and a part of the washing water branched at the water supply channel branching portion 50a flows into the overflow pipe 10b, and the rest is stored in the water storage tank 10. In a state where the drain valve 12 is closed, the wash water flows into the water reservoir 10, whereby the water level in the water reservoir 10 rises.

As shown in fig. 22, 25, etc., 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 the valve. Accordingly, the pilot valve 22c is in a valve-closed state, and therefore, the pressure in the pressure chamber 22b rises, and 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 of the gap 14d, and the piston 14b is pressed by the urging force of the spring 14c, and the rod 232 moves toward the drain valve. When the hook 130d is lowered to the position of the engaging claw 30c, it descends along the inclined surface of the engaging claw 30c, and rotates to the original position by gravity when passing over the engaging claw 30c, the hook 130d is engaged with the engaging claw 30c again, the clutch mechanism 230 is connected, and the lever 232 and the valve shaft 12a are connected. Therefore, the standby state is restored before the toilet cleaning is started.

Next, the operation of the small cleaning 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 cleaning is the same as the large cleaning mode.

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

Next, as shown in fig. 23, 25, etc., when the controller 40 selects the small purge mode, the controller 40 opens the solenoid valve 18 (starts purging) and then closes the solenoid valve 18 and closes the first control valve 16 after a second time elapses. The second time is set to a time shorter than the first time. The timing (the elapse of the second time) at which the controller 40 closes the solenoid valve 18 is set in consideration of the following timing: as will be described later, the piston 14b starts to descend and the clutch mechanism 230 is cut off at a timing when the drain valve 12 is seated in the drain port 10a and the drain port 10a is closed when the water level in the water tank 10 decreases to the predetermined water level WL 2. The first control valve 16 closes, and thus the supply of the washing water to the drain valve hydraulic driving portion 214 and the drain portion 54 is stopped. Immediately after the supply of the washing water is stopped, the washing water is stored in the water storage portion 156 until the water storage portion 156 is substantially full, and the water storage portion 156 is lowered by the weight of the washing water. Accordingly, 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 water 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 urging force of the spring 14c, and the rod 232 moves toward the drain valve. Thus, the drain valve water pressure driving portion side end 130e of the hook member 130b abuts against the tip end 258a, and the drain valve water pressure driving portion side end 130e rotates counterclockwise about the rotation shaft 130 a. With this rotation, the lower side portion of the hook member 130b and the hook portion 130d are rotated in a lifted manner. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. Thereby, the clutch mechanism 230 is cut off, and the drain valve 12 is lowered. The supply of the washing water from the second control valve 22 into the water tank 10 via the water supply path 50 is continued.

As shown in fig. 24, 25, etc., the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. In this way, when the small flush mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 decreases from the full water level WL to the predetermined water level WL2, and the second flush water amount smaller than the first flush water amount is discharged to the flush toilet body 2. Then, the washing water stored in the water accumulation portion 156 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water accumulation portion 156 is lowered. When the cleaning water in the water accumulation portion 156 is emptied or reduced, the water accumulation portion 156 and the transmission portion 248 rise again by the spring 249, and return to the standby position. Therefore, the working portion 258 also moves backward in a direction away from the lever 232 according to the rising of the transmission portion 248. The piston 14b is further lowered as the washing water in the cylinder 14a of the drain valve hydraulic driving unit 14 flows out.

While the third embodiment has been described above, all or part of the structures of the first embodiment, the second embodiment, the third embodiment, and the structures of the modifications may be arbitrarily combined or extracted and changed.

According to the flush tank device 204 according to the third embodiment of the present invention described above, the drain valve water pressure driving section 214 is disposed so as to be separated from the drain valve housing 213 on the outside of the drain valve housing 213, the drain valve 12 is disposed on the inside of the drain valve housing 213, and the clutch mechanism 230 is disposed between the drain valve water pressure driving section 214 and the drain valve housing 213 on the drain valve water pressure driving section side. Accordingly, the clutch mechanism 230 can be disposed between the drain valve housing 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 cut-off clutch mechanism 230 and the degree of freedom in the arrangement position of the clutch mechanism 230 can be improved.

Reference numerals illustrate:

1: a toilet flush device; 2: a water-washing toilet body; 4: cleaning the water tank device; 6: a remote control device; 10: a water storage tank; 10a: a water outlet; 12: a drain valve; 14: a water pressure driving part of the drain valve; 18: an electromagnetic valve; 24: an electromagnetic valve; 26: a float; 26a: a float; 30: a clutch mechanism; 46: a holding mechanism; 48: a transmission section; 54: a discharge section; 56: a water accumulation part; 56b: a discharge hole; 104: cleaning the water tank device; 130: a clutch mechanism; 148: a transmission section; 156: a water accumulation part; a1: instantaneous flow; a2: instantaneous flow; f: a float switch; f1: a float device; LS: an electromagnetic valve; PV: a pilot valve; VB: a vacuum regulating valve; WL: full water level; WL1: defining a water level; WL2: defining a water level; WL3: the water level is specified.

Claims

1. A flush tank device for supplying flush water to a flush toilet is provided with:

a water storage tank that stores washing water to be supplied to the toilet bowl, and that has a drain port for draining the stored washing water to the toilet bowl;

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

a drain valve water pressure driving unit for driving the drain valve by using the water supply pressure of the supplied tap water;

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

a flush water amount selection unit configured to select a first flush water amount for cleaning the toilet bowl and a second flush water amount smaller than the first flush water amount;

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

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

When the first amount of washing water is selected by the washing water amount selecting unit, the timing control mechanism is engaged with the drain valve, the valve control unit causes the timing control mechanism to operate so as to release the engagement between the timing control mechanism and the drain valve when a first time elapses, causes the drain valve to descend when the first time elapses,

when the second amount of washing water is selected by the washing water amount selecting unit, the timing control mechanism is engaged with the drain valve, and the valve control unit operates the timing control mechanism so as to release the engagement between the timing control mechanism 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 flush tank device for supplying flush water to a flush toilet is provided with:

a clutch mechanism that connects the drain valve to the drain valve water pressure driving unit, lifts the drain valve by a driving force of the drain valve water pressure driving unit, and is cut off, thereby lowering the drain valve;

a flush water amount selection unit configured to select a first flush water amount for cleaning the toilet bowl and a second flush water amount smaller than the first flush water amount; and

a valve control unit configured to be able to cut off the clutch mechanism at a predetermined timing, wherein when the first amount of the washing water is selected by the washing water amount selection unit, the valve control unit operates to cut off the clutch mechanism by a lapse of a first time, and lowers the drain valve by the lapse of the first time,

when the second amount of washing water is selected by the washing water amount selecting unit, the valve control unit operates to cut 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 flush tank apparatus according to claim 1 or 2, further comprising:

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

a control unit for controlling the control valve,

the valve control unit is configured to operate by the supplied washing water.

4. The flush tank assembly of claim 3, wherein,

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

5. The flush tank assembly of claim 3, wherein,

the control valve is provided to control the supply of the washing water to the drain valve hydraulic driving unit.

6. The flush tank assembly of claim 3, wherein,

the control valve supplies the cleaning water to the valve control section via the drain valve water pressure driving section.

7. The flush tank apparatus according to claim 1, wherein the valve control section includes:

a water accumulation part for accumulating the cleaning water, wherein a discharge hole for discharging the accumulated cleaning water is formed at the lower part of the water accumulation part;

a drain unit that drains the washing water to the water accumulation unit; and

a float arranged in the water accumulation part and moving up and down according to the water level in the water accumulation part,

The timing control mechanism is provided with an engaging part which can be engaged with the drain valve according to the position of the float,

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

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.

8. The flush tank assembly of claim 7, wherein,

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

9. The flush tank assembly of claim 1, wherein,

the drain valve water pressure driving 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 on the inside of the drain valve housing, and the clutch mechanism is disposed between the drain valve water pressure driving unit and the drain valve housing on the drain valve water pressure driving unit side.

10. The flush tank apparatus according to claim 1, wherein the valve control section includes:

a discharge unit that discharges the supplied cleaning water when the second cleaning water amount is selected by the cleaning water amount selection unit;

A water accumulation unit for accumulating the washing water discharged from the discharge unit; and

the timing control means is connected to the float and operates in response to the upward and downward movement of the float, and controls the timing of lowering the drain valve so that the timing of closing the drain port when the second amount of the cleaning water is selected is earlier than the timing of closing the drain port when the first amount of the cleaning water is selected.

11. The flush tank assembly of claim 10, wherein,

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

the volume of the cleaning water which can be stored between the water accumulating part and the floater in the water accumulating part is smaller than that of the cylinder barrel.

12. The flush tank apparatus of claim 10 or 11, wherein,

the discharge portion forms a downward discharge port.

13. The flush tank assembly of claim 10, wherein,

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

14. The flush tank assembly of claim 10, wherein,

a drain hole for draining the accumulated cleaning water is formed in the water accumulation portion.

15. The flush tank assembly of claim 14 wherein,

the drain hole of the water accumulation part is formed at the lower part of the side wall of the water accumulation part, and forms an opening facing to the opposite side of the drain valve in a plan view.

16. The flush tank assembly of claim 14 wherein,

the instant flow rate of the washing water discharged from the drain hole is smaller than the instant flow rate of the washing water discharged from the drain portion.

17. A water-washing toilet device is characterized by comprising:

the flush tank apparatus of any one of claims 1 to 16; and

the flush toilet is cleaned by the cleaning water supplied from the cleaning water tank device.