JP2023110607A - Drain valve device, washing water tank device, and water closet - Google Patents

Abstract

To provide a drain valve device, a washing water tank device, and a water closet capable of changing a time for lowering a float in association with drop of a water level to keep an instantaneous flow amount (L/min) of washing water drained from a drain port during small washing, relatively high, by changing buoyancy working on the float according to a selected large or small washing mode.SOLUTION: A drain valve device 1 includes a valve element 36, a water storage cylinder 62, and a float 72, where during a time from when the valve element is opened and to when the valve element is closed, either a large washing mode that washing water in a water storage tank 12 is supplied from a drain port 18 to a water closet 4 at a first washing water amount or a small washing mode that the washing water is supplied at a second washing water amount smaller than the first washing water amount can be selectively executed. The float is constructed so that buoyancy obtained during the small washing mode becomes smaller than the buoyancy obtained during the large washing mode.SELECTED DRAWING: Figure 3B

Description

The present invention relates to a drain valve device, a flush water tank device, and a flush toilet. The present invention relates to a flush water tank device and a flush toilet provided with this flush water tank device.

Conventionally, as a drain valve device provided in a flush water tank that supplies flush water to a flush toilet, for example, as described in Patent Documents 1 and 2, a drain that opens and closes the drain port of the flush water tank is disclosed. It is known to use the buoyancy of the float in the opening and closing operation of the drain valve.
First, in the conventional drain valve device described in the above-mentioned Patent Document 1, a valve body for opening and closing a drain port provided at the bottom of the wash water tank and an operating shaft for opening and closing the valve body by moving up and down a water reservoir for vertically inserting the operating shaft and storing part of the wash water in the wash water tank; and a float disposed in the water reservoir for applying buoyancy to the operating shaft. there is
Further, in the conventional drain valve device described in the above-mentioned Patent Document 1, the float is arranged in the water reservoir, so that the float does not affect the flow of wash water outside the water reservoir. Although the opening time of the drain valve can be made constant, the amount of wash water discharged from the drain port of the wash water tank differs between large and small wash operations.

Next, the conventional drain valve device described in the above-mentioned Patent Document 2 is a so-called ball tap type drain valve device equipped with two floats, a float for large washing and a float for small washing. .
With this drain valve device, the opening time of the drain valve during large flushing is set longer than the valve opening time of the drain valve during small flushing, so that the amount of flushing water during large flushing is greater than that during small flushing. It can be set large.

JP 2014-185491 A JP 2019-157601 A

However, in the conventional drain valve device described in the above-mentioned Patent Document 1, the opening time of the drain valve is constant during both the large wash and the small wash, while the water from the drain port of the wash water tank is kept constant. This causes a difference in the amount of washing water discharged.
As a result, especially during a small wash, immediately after the drain valve opens, the flow rate per unit time of the wash water discharged from the drain port (hereinafter "instantaneous flow rate") [L/min] Although the maximum value (the so-called "drainage peak") is almost the same as when the water is washed, the instantaneous flow rate [L/min] will decrease significantly compared to the time of the large wash while the drain valve is open. , maintaining the instantaneous flow rate [L/min] as high as possible has been a conventionally demanded issue in ensuring good cleaning performance.
Further, in the conventional drain valve device described in the above-mentioned Patent Document 2, by using two floats, a float for large cleaning and a float for small cleaning, the drain valve can be operated in each of the large and small cleanings. Since the valve opening time is changed, it is possible to maintain a relatively high instantaneous flow rate [L/min] of flush water discharged from the drain port during small flushes.
However, there is a problem that the more the instantaneous flow rate [L/min] of the wash water discharged from the drain port is maintained relatively high, the louder the closing sound generated when the drain valve closes the drain port. There is a problem that it is necessary to devise a design such as the size of each of the two floats, the float for washing and the float for small washing.
Therefore, the present inventors maintained a relatively high instantaneous flow rate [L/min] of the wash water discharged from the drain port during the small wash and In order to reduce the noise, attention was paid to changing the buoyant force acting on the float according to the selected large wash mode or small wash mode.
Accordingly, various means are available to change the balance position between the water level in the wash water tank or water storage cylinder and the float, and to change the float descending time associated with the decrease in the water level in the wash water tank or water storage cylinder. Found it.

That is, the present invention has been made to solve the conventionally demanded problems and problems of the prior art described above. By changing , it is possible to change the time required for the float to descend as the water level drops, and it is possible to maintain a relatively high instantaneous flow rate [L/min] of the wash water discharged from the drain port during a small wash. Another object of the present invention is to provide a drain valve device, a flush water tank device, and a flush toilet capable of reducing the closing noise generated when the drain valve closes the drain port.

In order to solve the above-described problems, the present invention provides a drain valve device provided in a flush water tank for supplying flush water to a flush toilet, wherein a drain port provided at the bottom of the flush water tank is a valve body that opens and closes, an operating shaft that is provided with the valve body at the lower end thereof and that moves vertically to open and close the valve body, and a shaft that vertically passes through the operating shaft to release the wash water in the wash water tank. a water reservoir for partially storing water, the water reservoir formed with an outflow hole for allowing wash water inside to flow out to the outside; and a float for applying a buoyant force to the operating shaft, and the operating shaft and the valve body descend together with the float when the float descends as the water level in the water reservoir decreases. The valve body is configured to close the drain port, and flush water in the water storage tank flows from the drain port to the flush toilet during the period from when the valve body opens until it closes. Either a large cleaning mode in which one volume of cleaning water is supplied or a small cleaning mode in which a second volume of cleaning water is supplied which is smaller than the first volume of cleaning water can be selectively executed, and the float is capable of It is characterized in that the buoyancy obtained in the small washing mode is smaller than the buoyancy obtained in the large washing mode.
In the present invention configured as described above, when starting flushing of the flush toilet, first, either the large flushing mode or the small flushing mode is selected, and then the operation shaft of the drain valve device is selected. is raised (valve is opened), and the flush water in the flush water tank is supplied from the drain port to the flush toilet.
Then, the water level in the water reservoir drops according to the selected large wash mode or small wash mode, and the float in the water reservoir descends as the water level drops.
As a result, the operating shaft of the drain valve device descends, the valve element descends (valve is closed), the supply of flush water from the flush water tank to the flush toilet is stopped, and flushing of the flush toilet is completed. .
At this time, since the buoyancy obtained in the float in the small cleaning mode is smaller than the buoyancy obtained in the large cleaning mode, the float descending time in the small cleaning mode is made shorter than the float descending time in the large cleaning mode. be able to.
As a result, the float lowering time and the valve opening time in the small cleaning mode can be made shorter than the float lowering time and the valve opening time in the large cleaning mode.
As a result, by changing the buoyancy acting on the float in accordance with the selected large wash mode or small wash mode, when the wash water in the water tank flows out from the outflow hole into the wash water tank, the By changing the equilibrium position between the water level in the reservoir and the float, it is possible to change the descending time of the float as the water level in the reservoir decreases.
Therefore, the flow rate of cleaning water per unit time (hereinafter "instantaneous flow rate") [L/min], which affects cleaning performance, is relatively high even in the small cleaning mode, which uses less cleaning water than the large cleaning mode. can be maintained. It is also possible to reduce the closing noise generated when the valve body closes the drain port.

In the present invention, it is preferable that the float has a storage portion for storing the wash water in a part thereof, and the storage portion has an amount of wash water stored in the small wash mode that is larger than that in the large wash mode. It is configured to be larger than the amount of wash water that is stored.
In the present invention configured as described above, since the float has a storage portion for storing the wash water in a part thereof, the storage portion allows the amount of wash water stored in the small wash mode to be reduced to a large wash amount. It can be made larger than the amount of wash water stored in the mode.
Therefore, since the weight of the reservoir in the small wash mode is also greater than the weight of the reservoir in the large wash mode, the buoyancy obtained in the float in the small wash mode is smaller than the buoyancy obtained in the large wash mode. .
Therefore, the float lowering time in the small washing mode can be made shorter than the float lowering time in the large washing mode.
As a result, the float lowering time and the valve opening time in the small cleaning mode can be made shorter than the float lowering time and the valve opening time in the large cleaning mode.
As a result, by changing the buoyancy acting on the float in accordance with the selected large wash mode or small wash mode, when the wash water in the water tank flows out from the outflow hole into the wash water tank, the By changing the equilibrium position between the water level in the reservoir and the float, it is possible to change the descending time of the float as the water level in the reservoir decreases.
Therefore, the instantaneous flow rate [L/min] of cleansing water, which affects the cleansing performance, can be maintained relatively high even in the small cleansing mode in which the amount of cleansing water is smaller than that in the large cleansing mode. It is also possible to reduce the closing noise generated when the valve body closes the drain port.

In the present invention, preferably, the reservoir is provided above the float, and is formed in a peripheral wall portion surrounding a portion of the upper portion of the float so as to store wash water, and a portion of the peripheral wall portion. and a partition provided to be openable and closable with respect to the outflow port,
The partition section opens the outflow port of the peripheral wall portion in the large cleaning mode to allow the cleansing water in the storage portion to flow out from the outflow port, while in the small cleaning mode, the peripheral wall portion allows the cleansing water to flow out through the outflow port. By closing the outlet and maintaining the state in which the wash water is stored in the reservoir, the reservoir serves as a water weight.
In the present invention configured as described above, when the large cleaning mode is executed, the partition opens the outflow port of the peripheral wall of the reservoir provided above the float, thereby cleaning the inside of the reservoir. Since the water flows out from the outflow port and no wash water is stored in the reservoir at the top of the float, the buoyancy of the float can be set relatively large.
On the other hand, when executing the small wash mode, the partition closes the outflow port of the peripheral wall so that the wash water in the reservoir cannot flow out from the outflow port, and the water is washed in the reservoir above the float. Water is stored, and the storage part itself functions as a water weight.
As a result, the buoyancy of the float in the small washing mode can be set smaller than that in the large washing mode.
As a result, by changing the buoyancy acting on the float according to the selected large wash mode or small wash mode, it is possible to reliably switch the float descending time and the valve opening time of the valve body.
Moreover, since the valve opening time of the valve body is not affected by manufacturing errors in the flush water tank or the flush toilet to which the drain valve device is applied, proper flushing can be performed.

In the present invention, preferably, the float has a peripheral wall portion that surrounds a portion of the lower portion of the float so as to store wash water, and a portion of the peripheral wall portion that surrounds the float. A communication port communicating between the inside and the outside is provided, and a partition portion is provided so as to be able to open and close with respect to the communication port, and the partition portion closes the communication port of the peripheral wall portion in the large cleaning mode. This restricts communication of cleansing water or air between the inside and outside of the float, while opening the communication port of the peripheral wall in the small cleansing mode enables communication of cleansing water or air between the inside and outside of the float. do.
In the present invention configured as described above, when the large cleaning mode is executed, the partition closes the communication port of the peripheral wall provided at the bottom of the float, thereby allowing the cleaning water or water to flow inside and outside the float. Since air communication is restricted, the buoyancy of the float can be set relatively large due to the air trapped inside the float.
On the other hand, when the small wash mode is executed, the partition opens the communication port of the peripheral wall to allow communication of wash water or air between the inside and outside of the float.
As a result, part of the air inside the float is discharged to the outside of the float through the communication port of the peripheral wall portion, and the wash water outside the float is discharged into the float by the volume of the discharged air. can partially flow into the lower region of the
Therefore, since the volume of air occupied in the float in the small wash mode is smaller than the volume of air occupied in the float in the large wash mode, the buoyancy of the float in the small wash mode is lower than in the large wash mode. Can be set smaller.
As a result, by changing the buoyancy acting on the float according to the selected large wash mode or small wash mode, it is possible to reliably switch the float descending time and the valve opening time of the valve body.
In addition, since the valve opening time is not affected by manufacturing errors in the flush water tank or flush toilet to which the drain valve device is applied, the flush toilet to which the drain valve device is applied can be properly flushed. can be executed.

In the present invention, preferably, the float includes a top surface portion closing an upper region of the peripheral wall portion and a lower opening formed along a lower edge of the peripheral wall portion. The communication port is provided at a height position between the top surface portion and the lower opening portion.
In the present invention configured as described above, when the partition closes the communication port of the peripheral wall portion of the float in the large wash mode, the inside of the float is filled with air, so that the washing water outside the float is removed. is suppressed from flowing into the float from the lower opening.
On the other hand, when the partition part opens the communication port of the peripheral wall of the float in the small wash mode, part of the air in the float is discharged from the communication port, so that the wash water outside the float flows downward. The water can flow from the opening and/or the communication port to the vicinity of the height of the communication port in the float, and the buoyancy acting on the float in the small cleaning mode is smaller than the buoyancy acting on the float in the large cleaning mode.
As a result, by changing the buoyancy acting on the float according to the selected large wash mode or small wash mode, it is possible to reliably switch the float descending time and the valve opening time of the valve body.
In addition, since the valve opening time is not affected by manufacturing errors in the flush water tank or flush toilet to which the drain valve device is applied, the flush toilet to which the drain valve device is applied can be properly flushed. can be executed.

Next, the present invention provides a drain valve device provided in a flush water tank for supplying flush water to a flush toilet, comprising: a valve body for opening and closing a drain port provided at the bottom of the flush water tank; The valve body is provided at the lower end, and an operating shaft that opens and closes the valve body by moving up and down; and a float to act on, and when the float descends as the water level in the wash water tank decreases, the actuating shaft and the valve body move downward in conjunction with the float, and the valve body moves downward. The water discharge port is closed, and the flush water in the water storage tank is supplied from the drain port to the flush toilet at a first flush water volume during the period from when the valve body opens until it closes. or a small washing mode in which a second washing water quantity smaller than the first washing water quantity is supplied, and the float is obtained in the small washing mode. It is characterized in that the buoyancy is made smaller than the buoyancy obtained in the large washing mode.
In the present invention configured as described above, when starting flushing of the flush toilet, first, either the large flushing mode or the small flushing mode is selected, and then the operation shaft of the drain valve device is selected. is raised (valve is opened), and the flush water in the flush water tank is supplied from the drain port to the flush toilet.
When the water level in the wash water tank drops according to the selected large wash mode or small wash mode, the float descends as the water level drops. As a result, the operating shaft of the drain valve device descends, the valve element descends (valve is closed), the supply of flush water from the flush water tank to the flush toilet is stopped, and flushing of the flush toilet is completed. .
At this time, since the buoyancy obtained in the float in the small cleaning mode is smaller than the buoyancy obtained in the large cleaning mode, the float descending time in the small cleaning mode is made shorter than the float descending time in the large cleaning mode. be able to.
As a result, the float lowering time and the valve opening time in the small cleaning mode can be made shorter than the float lowering time and the valve opening time in the large cleaning mode.
As a result, the balance position between the water level in the wash water tank and the float is changed by changing the buoyancy acting on the float according to the selected large wash mode or small wash mode. It is possible to change the descending time of the float as the water level drops.
Therefore, the instantaneous flow rate [L/min] of cleansing water, which affects the cleansing performance, can be maintained relatively high even in the small cleansing mode in which the amount of cleansing water is smaller than that in the large cleansing mode. It is also possible to reduce the closing noise generated when the valve body closes the drain port.

Further, the present invention is a washing water tank device including the drain valve device.
In the present invention configured as described above, by changing the buoyancy acting on the float according to the selected large wash mode or small wash mode, the descending time of the float as the water level drops can be changed. To maintain a relatively high instantaneous flow rate [L/min] of wash water discharged from a drain port during a small wash, and to reduce closing noise generated when a valve body closes the drain port. It is possible to provide a washing water tank device equipped with a drain valve device capable of

Furthermore, the present invention is a flush toilet provided with the flush water tank device.
In the present invention configured as described above, by changing the buoyancy acting on the float according to the selected large wash mode or small wash mode, the descending time of the float as the water level drops can be changed. To maintain a relatively high instantaneous flow rate [L/min] of wash water discharged from a drain port during a small wash, and to reduce closing noise generated when a valve body closes the drain port. It is possible to provide a flush toilet equipped with a flush water tank device having a drain valve device capable of

According to the drain valve device, the flush water tank device, and the flush toilet of the present invention, by changing the buoyancy acting on the float according to the selected large flush mode or small flush mode, The float descending time can be changed, the instantaneous flow rate [L/min] of wash water discharged from the drain port can be maintained relatively high during small washing, and the drain valve closes the drain port. It is possible to reduce the closing sound that occurs when the door is closed.

1 is a perspective view of a flush water tank device and a flush toilet to which a drain valve device according to a first embodiment of the present invention is applied, viewed obliquely from above; FIG. 1 is a front cross-sectional view of a washing water tank device equipped with a drain valve device according to a first embodiment of the present invention; FIG. 1 is a schematic diagram showing a configuration of a drain valve device according to a first embodiment of the present invention, and a series of operations from a standby state to a large cleaning mode starting to open a valve and closing the valve; FIG. 1 is a schematic diagram showing a configuration of a drain valve device according to a first embodiment of the present invention, and a series of operations from a standby state to a small cleaning mode starting to open a valve and closing the valve; FIG. It is the schematic which shows the structure of the drain valve apparatus by 2nd Embodiment of this invention, and a series of operation|movement until valve-opening is started by large washing mode from a standby state until it closes. It is the schematic which shows the structure of the drain valve apparatus by 2nd Embodiment of this invention, and a series of operation|movement until valve opening is started by small washing|cleaning mode from a standby state until it closes. It is a schematic diagram showing the structure of the drain valve apparatus by 3rd Embodiment of this invention, and a series of operation|movement until valve opening is started by the large washing mode from a standby state, and closing a valve. It is the schematic which shows the structure of the drain valve apparatus by 3rd Embodiment of this invention, and a series of operation|movement until valve opening is started and it closes by small washing|cleaning mode from a standby state. It is a schematic diagram showing the configuration of the drain valve device according to the fourth embodiment of the present invention, and a series of operations from the standby state to the start of opening the valve in the large cleaning mode until the valve is closed. It is the schematic which shows the structure of the drain valve apparatus by 4th Embodiment of this invention, and a series of operation|movement until valve opening is started by small washing|cleaning mode from a standby state until it closes.

Hereinafter, several embodiments of a drain valve device, a flush water tank device equipped with this drain valve device, and a flush toilet equipped with this flush water tank device of the present invention will be described with reference to the accompanying drawings. .
First, referring to FIGS. 1 to 3B, a drain valve device 1 according to a first embodiment of the present invention, a flush water tank device 2 including this drain valve device 1, and a flush toilet equipped with this flush water tank device 2 are shown. 4 will be explained.
FIG. 1 is a perspective view of a flush water tank device 2 and a flush toilet bowl 4 to which a drain valve device 1 according to a first embodiment of the present invention is applied, viewed obliquely from above. FIG. 2 is a front cross-sectional view of the washing water tank device 2 provided with the drain valve device 1 according to the first embodiment of the present invention.

As shown in FIGS. 1 and 2, a flush toilet bowl 4 equipped with a flush water tank device 2 to which a drain valve device 1 according to the first embodiment of the present invention is applied is a ceramic toilet bowl forming a bowl portion 6. A main body 8 is provided.
A flush water tank device 2, which will be described later in detail, is provided on the rear side of the upper surface of the toilet body 8. As shown in FIG. When the flush water stored in the flush water tank device 2 is supplied to the toilet body 8 of the flush toilet bowl 4 by the operation of the drain valve device 1 of the present embodiment, the inside of the bowl portion 6 is cleaned. It's becoming
Here, as a form of the flush toilet 4 equipped with the flush water tank device 2 to which the drain valve device 1 of the present embodiment is applied, for example, filth in the bowl portion 6 is sucked using a siphon action, A form of a so-called "siphon-type flush toilet bowl" may be applied, in which water is discharged to the outside at once from a drain trap portion (not shown) on the downstream side, or the running water due to the water drop in the bowl portion 6 may be applied. A form of a so-called “wash-off type flush toilet” may be applied in which waste is washed away by action.

Next, referring to FIG. 2, a schematic configuration of the washing water tank device 2 to which the drain valve device 1 of the present embodiment is applied will be described.
As shown in FIG. 2, the flush water tank device 2 includes an exterior tank 10 made of ceramic, a water storage tank 12 disposed inside the exterior tank 10 and serving as a flush water tank for storing flush water for flushing the toilet bowl, and an exterior tank. and a lid 14 placed above the 10 .
First, the water storage tank 12 is attached to the outer tank 10 via a heat insulator 16 surrounding the outer periphery.
A drain port 18 communicating with the water conduit 8 a of the toilet body 8 is provided at the bottom of each of the water storage tank 12 and the outer tank 10 . The drain port 18 can be opened and closed by the drain valve device 1 of the present embodiment, which will be detailed later.
In addition, regarding the cover body 14 of the washing water tank device 2 of the present embodiment, a form in which a hand-washing means such as a hand-washing bowl portion (hand-washing bowl) or a hand-washing faucet is not provided on the upper surface thereof will be described. , even in a form in which these means for hand washing are provided.

Next, as shown in FIG. 2, the washing water tank device 2 includes a water supply device 20 for supplying washing water into the water storage tank 12 .
The water supply device 20 includes a water supply pipe 22, a valve unit 24 including a water supply valve (not shown), a water supply float 26, a water discharge pipe 28, and the like.
First, the water supply pipe 22 connects a water supply source (not shown) such as an external water pipe and the valve unit 24, and the washing water supplied from the water supply source (not shown) such as an external water pipe is supplied. can be supplied to the valve unit 24.
The water supply float 26 is connected to the valve unit 24 via a lever 30, and moves up and down according to the water level in the water storage tank 12 to open the water supply valve (not shown) of the valve unit 24. It is designed to open and close.
The water discharge pipe 28 is connected to the downstream side of the valve unit 24, and when a water supply valve (not shown) opens and closes, the valve unit 24 discharges cleansing water into the water storage tank 12 and stops the water. water supply and water stoppage).

Next, as shown in FIG. 2, the washing water tank device 2 is provided with an operating device 32 for opening and closing the drain valve device 1 .
The operating device 32 includes an operating lever 34 that is manually rotated by the user, an operating portion (pulling-up operating portion 38) for pulling up the valve body 36 of the drain valve device 1, the operating lever 34, and the pulling-up operating portion 38. A plurality of rotating shafts (outer rotating shaft 40, inner rotating shaft 42) to be connected are provided.

First, the operating lever 34 is provided on one of the left and right outer sides of the outer tank 10 (on the right side when viewed from the front side of the outer tank 10 of the washing water tank device 2 shown in FIG. 2), and is manually operated by the user. Rotational operation is possible around the rotation center axis A1 extending in the direction.
Next, the outer rotating shaft 40 is provided inside the exterior tank 10 and extends in the left-right direction, and one end side (on the side of the operating lever 34 ) is connected to the operating lever 34 .
The other end side (inner end side) of the outer rotating shaft 40 is connected to one end side (outer end side) of an inner rotating shaft 42 disposed inside thereof.

Next, the upper end of the lifting operation part 38 is fixed to the upper end of the water storage tank 12 at the central side.
The lifting operation part 38 includes a rotary main shaft part 44 connected to the other end side (inner end side) of the inner rotary shaft 42, a cylindrical rotary part 46 provided on the outer peripheral side of the rotary main shaft part 44, It has When the rotation main shaft portion 44 rotates about the rotation center axis A2, the cylindrical rotating portion 46 can rotate integrally with the rotation main shaft portion 44 about the rotation center axis A2.
Further, the cylindrical rotating portion 46 includes a first swing lever 48 involved in pulling up the valve body 36 when opening the valve body 36 of the drain valve device 1 in order to start flushing the toilet bowl, and a toilet bowl. and a second rocking lever 50 involved in switching the washing mode to either the large washing mode or the small washing mode.
Further, the upper side of the first ball chain 52 is connected to the first rocking lever 48, and the lower side of the first ball chain 52 operates (directly) the valve body 36 of the drain valve device 1, which will be described later in detail. It is connected to the upper end of an operating shaft 54 that moves (moves).
On the other hand, the upper side of the second ball chain 56 is connected to the second swing lever 50 . Further, the lower side of the second ball chain 56 is connected to a part of a switching valve 58 for switching between large and small washings of the drain valve device 1, which will be detailed later.

For example, when starting toilet flushing in the large flushing mode, the operation lever 34 shown in FIG. 2 is rotated by a predetermined angle (for example, 90 degrees) to one side (the front side in FIG. 2) around the rotation center axis A1. As a result, the outer rotating shaft 40 and the inner rotating shaft 42 connected to the operation lever 34 rotate to one side, and the rotation main shaft portion 44 of the lifting operation portion 38 rotates to one side about the rotation center axis A2. It's becoming
As a result, the cylindrical rotating portion 46 of the lifting operation portion 38 also rotates to one side (the front side in FIG. 2) about the rotation center axis A2 integrally with the rotation main shaft portion 44, thereby moving the first rocking lever. 48 swings (turns) to one side (front side in FIG. 2) so as to pull up the first ball chain 52, while the second swing lever 50 does not swing and the second ball chain 56 is lifted. Each is designed not to be lifted.
On the other hand, when starting toilet flushing in the small flushing mode, the operation lever 34 shown in FIG. 2 is rotated by a predetermined angle (for example, 90 degrees) to the other side (back side in FIG. 2) around the rotation center axis A1. Then, the outer rotating shaft 40 and the inner rotating shaft 42 connected to the operation lever 34 rotate to the other side, and the rotation main shaft portion 44 of the lifting operation portion 38 rotates to the other side about the rotation center axis A2. It's becoming
As a result, the cylindrical rotating portion 46 of the lifting operation portion 38 also rotates to the other side (back side in FIG. 2) about the rotation center axis A2 integrally with the rotation main shaft portion 44, thereby moving the first rocking lever. 48 swings (turns) to the other side (back side in FIG. 2) so as to pull up the first ball chain 52, and the second swing lever 50 pulls up each of the second ball chains 56 to the other side. (Back side in FIG. 2) swings (turns).

In this embodiment, as the operation device 32 for operating the drain valve device 1, a mode in which the user manually operates the operation lever 34 will be described. It is possible.
For example, as another form of the operation device, the controller electrically controls the operation of the drive unit (motor, etc.) of the lifting operation unit based on a signal input by the user through an operation button or the like. The operation of pulling up the valve body 36 of the drain valve device 1 by the first rocking lever 48 and the switching operation between the large and small cleaning modes by the second rocking lever 50 may be performed automatically.
Further, each of the ball chains 52 and 56 of the drain valve device 1 in the present embodiment may be a linear wire member.

Next, details of the drain valve device 1 of the present embodiment will be described with reference to FIGS. 2 to 3B.
FIG. 3A is a schematic diagram showing the configuration of the drain valve device according to the first embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the large cleaning mode until the valve is closed.
FIG. 3B is a schematic diagram showing the configuration of the drain valve device according to the first embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the small wash mode until the valve is closed.
Here, in each state (I) to (VI) of the drain valve device 1 in the large cleaning mode shown in FIG. Thereafter, the open state of the valve body 36 is defined as states (II) to (V) in chronological order, and the closed state of the valve body 36 is defined as state (VI).
Further, in each state (I) to (IV) of the drain valve device 1 in the small cleaning mode shown in FIG. Hereinafter, the open state of the valve body 36 will be referred to as states (II) and (III), and the closed state of the valve body 36 will be referred to as state (IV).

First, as shown in FIG. 2, the drain valve device 1 of the present embodiment includes a drain port forming portion 60 attached to the bottom surface of the water storage tank 12 to form the drain port 18, and a drain port forming portion 60 above the drain port forming portion 60. and a water reservoir 62 provided. Also, an overflow pipe 60 a that communicates with the drain port 18 is attached to a part of the drain port forming portion 60 .
Next, as shown in FIG. 2, the drain valve device 1 is provided with a valve seat 66 formed on the upper edge of the drain port 18, and a valve seat 66 which is closable with respect to the valve seat 66 and can be linearly moved upward. It has a valve body 36 and an operating shaft 54 that opens and closes the valve body 36 by linearly moving (vertically moving) the valve body 36 provided at the lower end. The operating shaft 54 is provided so as to pass through the water reservoir cylinder 62 in the vertical direction.

Further, the water storage cylinder 62 can store a part of the wash water in the water storage tank 12 .
Further, an outflow hole 68 is provided in one of the left and right side walls 62a of the water reservoir 62 (the left side wall 62a when viewed from the front side of the water reservoir 62) to allow the washing water in the water reservoir 62 to flow out to the outside. It is
A float 72 is arranged in the water reservoir 62 . The float 72 is provided concentrically on the outer peripheral side of the operating shaft 54 , and interlocks (moves up and down) with the water level in the water reservoir 62 . It is designed to be able to act on

Next, as shown in FIG. 2, the outflow hole 68 of the water reservoir 62 is always open regardless of the large or small washing mode, and a reservoir 74 for storing washing water is provided above the float 72. It is The storage portion 74 includes a peripheral wall portion 76 surrounding the periphery thereof, an outflow port 78 formed in a part of the peripheral wall portion 76, and a partition portion (large/small cleaning switching) provided to be openable and closable with respect to the outflow port 78. and a switching valve 58 for.
Further, the switching valve 58 opens the outflow port 78 of the peripheral wall portion 76 of the storage portion 74 of the float 72 in the large wash mode so that the wash water in the storage portion 74 can flow out from the outflow port 78. It has become.

On the other hand, in the small wash mode, the switching valve 58 closes the outflow port 78 of the peripheral wall portion 76 of the reservoir 74 of the float 72 to maintain the state in which the wash water is stored in the reservoir 74. The portion 74 functions as a water weight.
As a result, the amount of cleansing water stored in the storage section 74 during the small cleaning mode is greater than the amount of cleansing water stored in the storage section 74 during the large cleaning mode. is larger than the weight of the reservoir 74 in the large wash mode, and the buoyant force obtained in the small wash mode in the float 72 is smaller than the buoyant force obtained in the large wash mode.

Incidentally, as shown in FIG. 3A, when the toilet bowl is flushed in the large flushing mode, the switching valve 58 is loosened without the second ball chain 56 being pulled up by the second rocking lever 50. .
Further, as shown in FIG. 3A, the switching valve 58 opens the outflow port 78 of the reservoir 74 of the float 72 without being pulled up by the second ball chain 56 .
As a result, wash water is not stored in the reservoir 74 of the float 72 .

On the other hand, as shown in FIG. 3B, the second ball chain 56 of the switching valve 58 is pulled up by the second swing lever 50 when the toilet bowl is flushed in the small flush mode. Also, the switching valve 58 is pulled up by the second ball chain 56 to close the outflow port 78 of the reservoir 74 of the float 72 .
As a result, wash water is stored in the reservoir 74 of the float 72 .
As a result, in the float 72, the reservoir 74 functions as a water weight in the small wash mode, while the reservoir 74 does not function as a water weight in the large wash mode. It is designed to be smaller than the buoyancy obtained in the cleaning mode.
Therefore, in each of the large and small cleaning modes, the balanced position between the water level W2 in the reservoir cylinder 62 and the float 72 is changed according to the selected cleaning mode. The descending time T2 of the float 72 is shorter than the descending time T1 of the float 72 in the large cleaning mode (T2<T1).

Next, operation of the drain valve device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 2 to 3B.
First, the large cleaning mode performed by the drain valve device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 2 and 3A.
2 and 3A, when starting the large cleaning mode, for example, when the user rotates the operation lever 34 shown in FIG. Only the first swing lever 48 in the state (standby state) is swung, and only the first ball chain 52 is pulled up.
As a result, the actuating shaft 54 and the valve body 36 of the drain valve device 1 are pulled up through the first ball chain 52 and linearly moved upward, so that the float 72 is also integrally pulled up through the actuating shaft 54. (See state (II) in FIG. 3A).
At this time, since the second ball chain 56 is not lifted by the second swing lever 50 , the switching valve 58 is not lifted by the second ball chain 56 and the outflow port 78 of the reservoir 74 of the float 72 is opened. It will be in a state in which it has been rotated so as to be opened (see state (II) in FIG. 3A).
The state in which the switching valve 58 opens the outflow port 78 of the reservoir 74 of the float 72 is maintained until the end of the large cleaning mode (see states (II) to (VI) in FIG. 3A). ).

As a result, in state (II) of FIG. 3A, the float 72 and the valve body 36 are raised to their highest positions, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36 . Then, the wash water in the water storage tank 12 is drained to the drain port 18 .
After that, as shown in state (III) of FIG. Since the water pressure due to the water level W2 in the water storage tank 12 exceeds the water pressure due to the water level W1 in the water storage tank 12, the wash water in the water storage cylinder 62 flows out from the outflow hole 68.
Then, as shown in states (IV) and (V) of FIG. 3A, the water level W2 in the water reservoir 62 is higher than the water level W1 in the water reservoir 12, and the wash water in the water reservoir 62 flows out. It continues to flow out of hole 68 . Therefore, as the water level W2 in the water reservoir 62 gradually decreases, the float 72 also decreases in conjunction with the decrease in the water level W2.

Next, as shown in state (VI) in FIG. The outside is open to the atmosphere.
As a result, the flushing water in the water storage tube 62 flows out from the outflow hole 68 at a higher speed, and the water level W2 in the water storage tube 62 further drops. also decreases integrally.
Then, when the valve body 36 contacts the valve seat 66, the drain port 18 is closed, and the flushing water from the water storage tank 12 to the drain port 18 is stopped.
As a result, the supply of flush water from the flush water tank device 2 to the toilet body 8 in the large flush mode is terminated.

Next, a small cleaning mode performed by the drain valve device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 2 and 3B.
When starting the small wash mode from the standby state (I) in FIGS. 2 and 3B, for example, when the user rotates the operating lever 34 shown in FIG. The first rocking lever 48 and the second rocking lever 50 in the state (standby state) are respectively rocked, and the first ball chain 52 and the second ball chain 56 are pulled up.
As a result, the actuating shaft 54 and the valve body 36 of the drain valve device 1 are pulled up through the first ball chain 52 and linearly moved upward, so that the float 72 is also integrally pulled up through the actuating shaft 54. (See state (II) in FIG. 3B).
Further, the switching valve 58 is pulled up via the second ball chain 56 , and the outlet 78 of the reservoir 74 of the float 72 is opened by the switching valve 58 .
Further, the state in which the outlet 78 of the reservoir 74 of the float 72 is closed by the switching valve 58 is maintained until the small wash mode ends (see states (II) to (IV) in FIG. 3B). .

Further, as shown in state (II) in FIG. 3B, the float 72 and the valve body 36 are raised to the highest position, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water storage tank is closed. Drainage of wash water from inside 12 to drain port 18 is started.
After that, as shown in state (III) of FIG. Since the water pressure due to the water level W2 in the water storage tank 12 exceeds the water pressure due to the water level W1 in the water storage tank 12, the wash water in the water storage cylinder 62 flows out from the outflow hole 68.

At this time, the outlet 78 of the storage portion 74 of the float 72 in which the cleansing water is stored is kept closed by the switching valve 58 .
As a result, the weight of the storage section 74 (and the amount of cleansing water stored in the storage section 74) in the small cleansing mode is changed to the weight of the storing section 74 (and the amount of cleansing water stored in the storage section 74) in the large cleansing mode. ).
Therefore, in the small wash mode, the reservoir 74 of the float 72 acts as a water weight, so the buoyancy acting on the float 72 in the small wash mode is smaller than that in the large wash mode.
Therefore, the descending time T2 of the float 72 in the small cleaning mode is shorter than the descending time T1 of the float 72 in the large cleaning mode (T2<T1).
Also, the balance position between the water level W2 in the water reservoir 62 and the float 72 in the small wash mode with respect to the water reservoir 62 is lower than the balance position in the large wash mode.

Then, as shown in state (IV) of FIG. 3B, when the valve body 36 contacts the valve seat 66, the drain port 18 is closed, and the discharge of wash water from the water storage tank 12 to the drain port 18 is stopped. be.
This terminates the supply of flush water from the flush water tank device 2 to the toilet body 8 in the small flush mode.
At this time, the minimum water level DWL2 in the water storage tank 12 in the small wash mode in the state (VI) of FIG. It is located above the minimum water level DWL1 in the water storage tank 12 in the mode.
That is, the amount of wash water drained from the water storage tank 12 in the small wash mode to the drain port 18 in the small wash mode is increased by the amount that the minimum water level DWL2 in the small wash mode exceeds the minimum water level DWL1 in the large wash mode. The amount of washing water drained from the tank 12 to the drain port 18 is less than the amount.

According to the drain valve device 1 according to the first embodiment of the present invention described above, when starting the flushing of the flush toilet bowl 4, first, either the large flushing mode or the small flushing mode is selected. Then, by raising the operating shaft 54 of the drain valve device 1, the valve body 36 is raised (opened), and the flush water in the water storage tank 12 is supplied from the drain port 18 to the toilet body 8 of the flush toilet 4. be.
Then, the water level W2 of the water reservoir 62 drops according to the selected large wash mode or small wash mode, and the float 72 in the water reservoir 62 descends as the water level W2 drops. As a result, the operating shaft 54 of the drain valve device 1 descends, the valve body 36 descends (closes), and the flush water in the water storage tank 12 is supplied from the drain port 18 to the toilet body 8 of the flush toilet 4. be done.
Then, the water level W2 of the water storage tube 62 is lowered according to the selected large flush mode or small flush mode, and the supply of flush water to the toilet body 8 of the flush toilet bowl 4 is stopped from this water level W2. 4 washing is finished.
At this time, the buoyancy of the float 72 in the small wash mode is smaller than the buoyancy in the large wash mode. It can be shorter than T1 (T2<T1).
As a result, the lowering time of the float 72 and the opening time of the valve body 36 in the small cleaning mode can be made shorter than the lowering time of the float 72 and the opening time of the valve body 36 in the large cleaning mode.
As a result, by changing the buoyancy acting on the float 72 in accordance with the selected large wash mode or small wash mode, the wash water in the water reservoir 62 is caused to flow out from the outflow hole 68. By changing the position of equilibrium between the water level W2 in the tank 62 and the float 72, the descending times T1 and T2 of the float 72 as the water level W2 in the tank 62 decreases can be changed.
Therefore, the flow rate of cleaning water per unit time (hereinafter "instantaneous flow rate") [L/min], which affects cleaning performance, is relatively high even in the small cleaning mode, which uses less cleaning water than the large cleaning mode. can be maintained. It is also possible to reduce the closing noise generated when the valve body 36 closes the drain port.

Further, according to the drain valve device 1 according to the present embodiment, the float 72 is partially provided with the storage portion 74 for storing the wash water. The amount of wash water stored in the large wash mode can be made larger than the amount of wash water stored in the large wash mode.
Therefore, the weight of the reservoir 74 in the small wash mode is also greater than the weight of the reservoir 74 in the large wash mode. becomes smaller.
Therefore, the descending time T2 of the float 72 in the small cleaning mode can be made shorter than the descending time T1 of the float 72 in the large cleaning mode (T2<T1).
As a result, the lowering time of the float 72 and the opening time of the valve body 36 in the small cleaning mode can be made shorter than the lowering time of the float 72 and the opening time of the valve body 36 in the large cleaning mode.
As a result, by changing the buoyancy acting on the float 72 according to the selected large wash mode or small wash mode, when the wash water in the water reservoir 62 flows out from the outflow hole 68 to the water reservoir tank 12, By changing the balanced position between the water level W2 in the water reservoir 62 and the float 72 according to the cleaning mode, the descending times T1 and Tv2 of the float 72 accompanying the decrease in the water level in the water reservoir 62 can be changed.
Therefore, the instantaneous flow rate [L/min] of cleansing water, which affects the cleansing performance, can be maintained relatively high even in the small cleansing mode in which the amount of cleansing water is smaller than that in the large cleansing mode. Also, the closing noise generated when the valve body 36 closes the drain port 18 can be reduced.

Furthermore, according to the drain valve device 1 according to this embodiment, when executing the large cleaning mode, the switching valve 58 opens the outflow port 78 of the peripheral wall portion 76 of the storage portion 74 provided above the float 72. can do.
As a result, the cleansing water in the reservoir 74 flows out from the outlet 78 and is not retained in the reservoir 74 above the float 72, so that the buoyancy of the float 72 can be set relatively large.
On the other hand, when executing the small washing mode, the switching valve 58 closes the outlet 78 of the peripheral wall portion 76 of the reservoir 74 so that the washing water in the reservoir 74 can flow out from the outlet 78 . First, the washing water is stored in the reservoir 74 above the float 72, and the reservoir 74 itself functions as a water weight.
Thereby, the buoyancy of the float 72 in the small washing mode can be set smaller than that in the large washing mode.
As a result, by changing the buoyancy acting on the float 72 in accordance with the selected large wash mode or small wash mode, the descending time of the float 72 and the valve opening time of the valve element 36 can be reliably switched. .
In addition, since the valve opening time of the valve body 36 is not affected by manufacturing errors in the flush water tank device 2 and the flush toilet 4 to which the drain valve device 1 is applied, the flush toilet 4 to which the drain valve device 1 is applied can also perform proper cleaning.

Next, a drain valve device 100 according to a second embodiment of the present invention will be described with reference to FIGS. 4A and 4B.
FIG. 4A is a schematic diagram showing the configuration of the drain valve device according to the second embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the large cleaning mode until the valve is closed. FIG. 4B is a schematic diagram showing the configuration of the drain valve device according to the second embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the small cleaning mode until the valve is closed.
Here, in the drain valve device 100 according to the second embodiment of the present invention shown in FIGS. 4A and 4B, the same reference numerals are given to the same parts as the drain valve device 1 according to the first embodiment of the present invention described above, Description of these will be omitted.

First, as shown in FIGS. 4A and 4B, in the drain valve device 100 according to the second embodiment of the present invention, the float 172 is provided at its lower portion, and the lower portion of the float 172 is provided so as to store wash water. A peripheral wall portion 176 surrounds a portion of the . The float 172 also has a communication port 178 that is formed in a part of the peripheral wall portion 176 and that communicates the inside and the outside of the float 172 . Further, the float 172 has a partition (switching valve 158 for switching between large and small cleaning) that can be opened and closed by sliding vertically with respect to the communication port 178 .
Further, the switching valve 158 can regulate communication of cleaning water or air between the inside and outside of the float 172 by closing the communication port 178 of the peripheral wall portion 176 of the float 172 in the large cleaning mode. there is
On the other hand, the switching valve 158 enables communication of cleaning water or air between the inside and outside of the float 172 by opening the communication port 178 of the peripheral wall portion 176 of the float 172 in the small cleaning mode.

Next, as shown in FIGS. 4A and 4B, the float 172 has a top surface portion 180 closing the upper region of the peripheral wall portion 176 and a lower opening portion 182 formed along the lower edge of the peripheral wall portion 176. I have.
As a result, the float 172 has a generally tubular shape with an open bottom.
These structures of the drain valve device 100 of the present embodiment described above are different from the structure of the drain valve device 1 according to the first embodiment of the present invention described above.

Next, operation of the drain valve device 100 according to the second embodiment of the present invention will be described with reference to FIGS. 4A and 4B.
First, in the standby state shown in state (I) in FIGS. 4A and 4B, the switching valve 158 closes the communication port 178 .
Then, when the large cleaning mode is started from the standby state shown in state (I) of FIG. pulled upwards.
On the other hand, the switching valve 158 closes the communication port 178 of the float 172 without being pulled upward by the second ball chain 56 (see state (II) in FIG. 4A).
The state in which the communication port 178 of the float 172 is closed by the switching valve 158 changes from the state (III) in FIG. 4A to the state (VI) in FIG. ).

As a result, in state (II) of FIG. 4A, the float 72 and the valve body 36 are raised to their highest positions, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36 . Then, the wash water in the water storage tank 12 is drained to the drain port 18 .
After that, as shown in state (III) of FIG. Since the water pressure due to the water level W2 in the water storage tank 12 exceeds the water pressure due to the water level W1 in the water storage tank 12, the wash water in the water storage cylinder 62 flows out from the outflow hole 68.
Then, as shown in states (IV) and (V) of FIG. 4A, the water level W2 in the water reservoir 62 is higher than the water level W1 in the water reservoir 12, and the wash water in the water reservoir 62 flows out. It continues to flow out of hole 68 . Therefore, as the water level W2 in the water reservoir 62 gradually decreases, the float 72 also decreases in conjunction with the decrease in the water level W2.

Next, as shown in state (VI) in FIG. The outside of 68 is open to the atmosphere.
As a result, the flushing water in the water storage cylinder 62 flows out from the outflow hole 68 at a higher speed, and the water level W2 in the water storage cylinder 62 further drops. also descend together.
Then, when the valve body 36 contacts the valve seat 66, the drain port 18 is closed, and the flushing water from the water storage tank 12 to the drain port 18 is stopped.
As a result, the supply of flush water from the flush water tank device 2 to the toilet body 8 in the large flush mode is terminated.

On the other hand, when the small cleaning mode is started from the standby state shown in state (I) in FIG. 4B, the operating shaft 54 and valve body 36 are moved upward by the first ball chain 52 in state (II) in FIG. 4B. be raised.
Further, the switching valve 158 is pulled up via the second ball chain 56 , thereby sliding the switching valve 158 upward and opening the communication port 178 of the float 172 .
The state in which the communication port 178 of the float 72 is opened by the switching valve 158 is maintained thereafter until the small wash mode ends (see states (II) to (IV) in FIG. 4B).

Further, as shown in state (II) in FIG. 4B, the float 172 and the valve body 36 are raised to the highest position, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water storage tank is closed. Drainage of wash water from inside 12 to drain port 18 is started.
After that, as shown in state (III) in FIG. Since the water pressure due to the water level W2 in 62 exceeds the water pressure due to the water level W1 in the water storage tank 12 outside it, the wash water in the water storage cylinder 62 flows out of the outflow hole 68 .

Here, regarding the float 172, the state in which the communication port 178 is opened by the switching valve 158 is maintained.
As a result, part of the air A in the float 172 is discharged to the outside of the float 172 from the communication port 178 of the peripheral wall portion 176. The wash water outside of the float partially flows into the lower region within the float 172 .
Therefore, the air volume Q2 occupied in the float 172 in the small cleaning mode is smaller than the air volume Q1 occupied in the float 172 in the large cleaning mode (Q2<Q1).
As a result, the buoyancy of the float 172 in the small wash mode becomes smaller than that in the large wash mode.
Therefore, the descending time T2 of the float 172 in the small cleaning mode is shorter than the descending time T1 of the float 172 in the large cleaning mode (T2<T1).
Also, the balanced position between the water level W2 in the water reservoir 62 and the float 72 during the small flush mode is lower than the balanced position during the large flush mode.

Then, as shown in state (IV) in FIG. 4B, when the valve body 36 contacts the valve seat 66, the drain port 18 is closed, and the discharge of wash water from the water storage tank 12 to the drain port 18 is stopped. .
This terminates the supply of flush water from the flush water tank device 2 to the toilet body 8 in the small flush mode.
At this time, the minimum water level DWL2 in the water storage tank 12 in the small wash mode in the state (IV) of FIG. It is located above the minimum water level DWL1 in the water storage tank 12 in the mode.
That is, the amount of wash water drained from the water storage tank 12 in the small wash mode to the drain port 18 in the small wash mode is increased by the amount that the minimum water level DWL2 in the small wash mode exceeds the minimum water level DWL1 in the large wash mode. The amount of washing water drained from the tank 12 to the drain port 18 is less than the amount.

According to the drain valve device 100 according to the second embodiment of the present invention described above, as shown in FIG. The communication port 178 of the provided peripheral wall portion 176 is closed.
As a result, communication of cleaning water or air between the inside and outside of the float 172 is regulated, so that the buoyancy of the float 172 can be set relatively large due to the air A trapped inside the float 172 .
On the other hand, as shown in FIG. 4B, when executing the small wash mode, the switching valve 158 opens the communication port 178 of the peripheral wall portion 176, thereby enabling communication of wash water or air between the inside and outside of the float 172. becomes.
As a result, in the small cleaning mode, part of the air A in the float 172 is discharged to the outside of the float 172 from the communication port 178 of the peripheral wall portion 176, and the discharged air in the float 172 , the wash water outside the float 172 can partially flow into the lower region within the float 172 .
Therefore, the air volume Q2 occupied in the float 172 in the small cleaning mode is smaller than the air volume Q1 occupied in the float 172 in the large cleaning mode (Q2<Q1).
Thereby, the buoyancy of the float 172 in the small washing mode can be set smaller than that in the large washing mode.
As a result, by changing the buoyancy acting on the float 172 in accordance with the selected large wash mode or small wash mode, the descending time of the float 172 and the valve opening time of the valve body 36 can be reliably switched. .
In addition, since the valve opening time of the valve body 36 is not affected by manufacturing errors in the flush water tank device 2 and the flush toilet 4 to which the drain valve device 100 of the present embodiment is applied, the flush toilet to which the drain valve device 100 is applied 4 can also be properly cleaned.

Further, according to the drain valve device 100 according to the present embodiment, as shown in FIG. 4A, the switching valve 158 for switching between large and small washings closes the communication port 178 of the peripheral wall portion 176 of the float 172 in the large washing mode. In this state, the inside of the float 172 is filled with the air A, so that washing water outside the float 172 is prevented from flowing into the float 172 through the lower opening 182 .
On the other hand, as shown in FIG. 4B, when the switching valve 158 opens the communication port 178 of the peripheral wall portion 176 of the float 172 in the small cleaning mode, part of the air in the float 172 washing water outside the float 172 can flow from the lower opening 182 and/or the communication port 178 to near the height of the communication port 178 inside the float 172 .
As a result, the buoyant force acting on the float 172 during the small cleaning mode is smaller than the buoyant force acting on the float 172 during the large cleaning mode.
As a result, by changing the buoyancy acting on the float 172 in accordance with the selected large wash mode or small wash mode, the descending time of the float 172 and the valve opening time of the valve body 36 can be reliably switched. .
In addition, since the valve opening time of the valve body 36 is not affected by manufacturing errors in the flush water tank device 2 and the flush toilet 4 to which the drain valve device 100 of the present embodiment is applied, the flush toilet to which the drain valve device 100 is applied 4 can also be properly cleaned.

Next, a drain valve device 200 according to a third embodiment of the present invention will be described with reference to FIGS. 5A and 5B.
FIG. 5A is a schematic diagram showing the configuration of the drain valve device according to the third embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the large cleaning mode until the valve is closed. FIG. 5B is a schematic diagram showing the configuration of the drain valve device according to the third embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the small cleaning mode until the valve is closed.
Here, in the drain valve device 200 according to the third embodiment of the present invention shown in FIGS. 5A and 5B, the same parts as the drain valve devices 1 and 100 according to the first and second embodiments of the present invention described above are the same. Reference numerals are attached, and explanations thereof are omitted.

As shown in FIGS. 5A and 5B, in the drain valve device 200 according to the third embodiment of the present invention, the outflow ports of the storage portion 74 and the peripheral wall portion 76 of the drain valve device 1 according to the first embodiment of the present invention are described above. The structure of the drain valve device 1 according to the first embodiment of the present invention described above is common in that the same float as the float 72 provided with 78 is provided.
However, the drain valve device 200 of this embodiment does not include a water reservoir corresponding to the water reservoir 62 of the drain valve device 1 according to the first embodiment of the present invention described above. 1 has a different structure.

Next, with reference to FIG. 5A, the large flushing mode executed by the drain valve device 200 according to the third embodiment of the present invention will be described.
When the large washing mode is started from the waiting state (I) of FIG. 5A, only the first ball chain 52 is pulled up.
As a result, the actuating shaft 54 and the valve body 36 of the drain valve device 1 are pulled up through the first ball chain 52 and linearly moved upward, so that the float 72 is also integrally pulled up through the actuating shaft 54. (See state (II) in FIG. 5A).
At this time, since the second ball chain 56 is not pulled up, the switching valve 58 is rotated to open the outflow port 78 of the reservoir 74 of the float 72 without being pulled up by the second ball chain 56. state (see state (II) in FIG. 5A).
The state in which the switching valve 58 opens the outflow port 78 of the reservoir 74 of the float 72 is maintained until the end of the large cleaning mode (see states (II) to (V) in FIG. 5A). ).

As a result, in the state (II) of FIG. 5A, the float 72 and the valve body 36 are raised to the highest position, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water is stored. The flush water in the tank 12 is drained from the drain port 18 to the water conduit 8a of the toilet body 8. As shown in FIG.
After that, as shown in states (III) and (IV) of FIG. 5A, when the water level W1 in the water storage tank 12 drops, the float 72 drops in conjunction with the drop of the water level W1.
At this time, in the storage portion 74 of the float 72, the outflow port 78 is opened by the switching valve 58, and no cleaning water is stored, so that the storage portion 74 does not act as a water weight.
Then, the operating shaft 54 and the valve body 36 descend integrally with the float 72, and when the valve body 36 comes into contact with the valve seat 66 as shown in state (V) in FIG. 5A, the drain port 18 is closed. , the discharge of wash water from the water storage tank 12 to the drain port 18 is stopped.
As a result, the supply of flush water from the flush water tank device 2 to the toilet body 8 in the large flush mode is terminated.

Next, with reference to FIG. 5B, the small flushing mode executed by the drain valve device 200 according to the third embodiment of the present invention will be explained.
When the small wash mode is started from the standby state (I) of FIG. 5B, for example, each of the first ball chain 52 and the second ball chain 56 is pulled up.
As a result, the actuating shaft 54 and the valve body 36 of the drain valve device 1 are pulled up through the first ball chain 52 and linearly moved upward, so that the float 72 is also integrally pulled up through the actuating shaft 54. (See state (II) in FIG. 5B).
Also, the switching valve 58 is pulled up via the second ball chain 56 and the outflow port 78 of the reservoir 74 of the float 72 is closed by the switching valve 58 .
The state in which the outlet port 78 of the reservoir 74 of the float 72 is closed by the switching valve 58 is maintained until the small wash mode ends (see states (II) to (V) in FIG. 5B). .

Further, as shown in state (II) of FIG. 5B, the float 72 and the valve body 36 are raised to the highest position, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water storage tank is closed. Drainage of wash water from inside 12 to drain port 18 is started.
After that, as shown in state (III) of FIG. descend together.

At this time, the outlet 78 of the storage portion 74 of the float 72 in which the cleansing water is stored is kept closed by the switching valve 58 .
As a result, the weight of the storage section 74 (and the amount of cleansing water stored in the storage section 74) in the small cleansing mode is changed to the weight of the storing section 74 (and the amount of cleansing water stored in the storage section 74) in the large cleansing mode. ).
Therefore, in the small wash mode, the reservoir 74 of the float 72 acts as a water weight, so the buoyancy acting on the float 72 in the small wash mode is smaller than that in the large wash mode.
Therefore, the descending time T2 of the float 72 in the small cleaning mode is shorter than the descending time T1 of the float 72 in the large cleaning mode (T2<T1).
Also, the balanced position between the water level W1 in the water storage tank 12 and the float 72 in the small wash mode is lower than the balanced position in the large wash mode.

Then, the operating shaft 54 and the valve body 36 descend integrally with the float 72, and when the valve body 36 comes into contact with the valve seat 66 as shown in state (V) in FIG. 5B, the drain port 18 is closed. , the discharge of wash water from the water storage tank 12 to the drain port 18 is stopped.
This terminates the supply of flush water from the flush water tank device 2 to the toilet body 8 in the small flush mode.
At this time, the minimum water level DWL2 in the water storage tank 12 in the small wash mode in the state (V) of FIG. It is located above the minimum water level DWL1 in the water storage tank 12 in the mode.
That is, the amount of wash water drained from the water storage tank 12 in the small wash mode to the drain port 18 in the small wash mode is increased by the amount that the minimum water level DWL2 in the small wash mode exceeds the minimum water level DWL1 in the large wash mode. The amount of washing water drained from the tank 12 to the drain port 18 is less than the amount.

According to the drain valve device 200 according to the third embodiment of the present invention described above, when starting the flushing of the flush toilet bowl 4, first, either the large flushing mode or the small flushing mode is selected. Then, by raising the operating shaft 54 of the drain valve device 1, the valve body 36 is raised (opened), and the flush water in the water storage tank 12 is supplied from the drain port 18 to the toilet body 8 of the flush toilet 4. be.
When the water level W1 in the water storage tank 12 drops according to the selected large wash mode or small wash mode, the float 72 descends as the water level W1 drops.
As a result, the operating shaft 54 of the drain valve device 1 descends, the valve body 36 descends (closes), and the flush water in the water storage tank 12 is supplied from the drain port 18 to the toilet body 8 of the flush toilet 4. be done.
At this time, the buoyancy of the float 72 in the small wash mode is smaller than the buoyancy in the large wash mode. It can be shorter than T1 (T2<T1).
As a result, the lowering time of the float 72 and the opening time of the valve body 36 in the small cleaning mode can be made shorter than the lowering time of the float 72 and the opening time of the valve body 36 in the large cleaning mode.
As a result, by changing the buoyancy acting on the float 72 according to the selected large wash mode or small wash mode, the balance position between the water level W1 in the water storage tank 12 and the float 72 is changed, and the water storage tank The lowering times T1 and T2 of the float 72 associated with the lowering of the water level W1 within the tank 12 can be changed.
Therefore, the flow rate of cleaning water per unit time (hereinafter "instantaneous flow rate") [L/min], which affects cleaning performance, is relatively high even in the small cleaning mode, which uses less cleaning water than the large cleaning mode. can be maintained. It is also possible to reduce the closing noise generated when the valve body 36 closes the drain port.

Next, a drain valve device 300 according to a fourth embodiment of the present invention will be described with reference to FIGS. 6A and 6B.
FIG. 6A is a schematic diagram showing the configuration of a drain valve device according to a fourth embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the large cleaning mode until the valve is closed. FIG. 6B is a schematic diagram showing the configuration of the drain valve device according to the fourth embodiment of the present invention, and a series of operations from the standby state to the start of valve opening in the small cleaning mode until the valve is closed.
Here, in the drain valve device 300 according to the fourth embodiment of the present invention shown in FIGS. 6A and 6B, the same parts as the drain valve devices 1, 100, 200 according to the above-described first to third embodiments of the present invention are The same reference numerals are given, and explanations thereof are omitted.

As shown in FIGS. 6A and 6B, in the drain valve device 300 according to the fourth embodiment of the present invention, the float 172 having the communication port 178 of the drain valve device 100 according to the second embodiment of the present invention described above is the same. float, it is common to the structure of the drain valve device 100 according to the second embodiment of the present invention described above.
However, the drain valve device 300 of the present embodiment does not include a water reservoir corresponding to the water reservoir 62 of the drain valve device 100 according to the second embodiment of the present invention. It has a different structure than 100.

Next, with reference to FIG. 6A, the large cleaning mode performed by the drain valve device 300 according to the fourth embodiment of the present invention will be described.
When the large washing mode is started from the standby state (I) of FIG. 6A, only the first ball chain 52 is pulled up.
As a result, the actuating shaft 54 and the valve body 36 of the drain valve device 1 are pulled up through the first ball chain 52 and linearly moved upward, so that the float 72 is also integrally pulled up through the actuating shaft 54. (See state (II) in FIG. 6A).
At this time, since the second ball chain 56 is not pulled up, the switching valve 158 closes the communication port 178 of the float 172 without being pulled up by the second ball chain 56 (state (II )reference).
The state in which the switching valve 158 closes the communication port 178 of the float 172 is maintained thereafter until the large cleaning mode ends (see states (II) to (V) in FIG. 6A).

As a result, in the state (II) of FIG. 6A, the float 172 and the valve body 36 are raised to the highest position, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water is stored. The flush water in the tank 12 is drained from the drain port 18 to the water conduit 8a of the toilet body 8. As shown in FIG.
Thereafter, as shown in states (III) and (IV) of FIG. 6A, when the water level W1 in the water storage tank 12 drops, the float 72 drops in conjunction with the drop of the water level W1.
At this time, the communication port 178 of the float 172 is closed by the switching valve 158, and the pressure inside the float 172 is higher than the water pressure inside the water storage tank 12 outside the float 172. Wash water cannot flow into the float 172 through the communication port 178 of the float 172 or the lower opening 182 .
Then, the operating shaft 54 and the valve body 36 descend integrally with the float 72, and when the valve body 36 comes into contact with the valve seat 66 as shown in state (V) in FIG. 5A, the drain port 18 is closed. , the discharge of wash water from the water storage tank 12 to the drain port 18 is stopped.
As a result, the supply of flush water from the flush water tank device 2 to the toilet body 8 in the large flush mode is terminated.

On the other hand, when the small cleaning mode is started from the standby state shown in state (I) of FIG. be raised.
Further, the switching valve 158 is slid upward by pulling up the switching valve 158 via the second ball chain 56 to open the communication port 178 of the float 172 .
The state in which the communication port 178 of the float 72 is opened by the switching valve 158 is maintained thereafter until the small wash mode ends (see states (II) to (V) in FIG. 6B).

Furthermore, as shown in state (II) in FIG. 6B, the float 172 and the valve body 36 are raised to the highest position, and the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water storage tank is closed. Drainage of wash water from inside 12 to drain port 18 is started.
After that, as shown in state (III) of FIG. descend together.

Here, regarding the float 172, the state in which the communication port 178 is opened by the switching valve 158 is maintained.
As a result, part of the air A in the float 172 is discharged to the outside of the float 172 from the communication port 178 of the peripheral wall portion 176, and in the float 172, the volume of the discharged air and washing water is increased. , the wash water outside the float 172 partially flows into the lower region within the float 172 .
Therefore, the air volume Q2 occupied in the float 172 in the small cleaning mode is smaller than the air volume Q1 occupied in the float 172 in the large cleaning mode (Q2<Q1).
As a result, the buoyancy of the float 172 in the small wash mode becomes smaller than that in the large wash mode.
Therefore, the descending time T2 of the float 172 in the small cleaning mode is shorter than the descending time T1 of the float 72 in the large cleaning mode (T2<T1).
Further, the balanced position between the water level W1 in the water storage tank 12 and the float 172 in the small wash mode is also lower than the balanced position in the large wash mode.

Then, as shown in state (V) in FIG. 6B, when the valve body 36 contacts the valve seat 66, the drain port 18 is closed, and the discharge of wash water from the water storage tank 12 to the drain port 18 is stopped. be.
This terminates the supply of flush water from the flush water tank device 2 to the toilet body 8 in the small flush mode.
At this time, the minimum water level DWL2 in the water storage tank 12 in the small wash mode in the state (V) of FIG. It is located above the minimum water level DWL1 in the water storage tank 12 in the mode.
That is, the amount of wash water drained from the water storage tank 12 in the small wash mode to the drain port 18 in the small wash mode is increased by the amount that the minimum water level DWL2 in the small wash mode exceeds the minimum water level DWL1 in the large wash mode. The amount of washing water drained from the tank 12 to the drain port 18 is less than the amount.

According to the drain valve device 300 according to the fourth embodiment of the present invention described above, when starting to clean the flush toilet 4, first, either the large cleaning mode or the small cleaning mode is selected. Then, by raising the operating shaft 54 of the drain valve device 1, the valve body 36 is raised (opened), and the flush water in the water storage tank 12 is supplied from the drain port 18 to the toilet body 8 of the flush toilet 4. be.
When the water level W1 in the water storage tank 12 drops according to the selected large wash mode or small wash mode, the float 172 descends as the water level W1 drops.
As a result, the operating shaft 54 of the drain valve device 1 descends, the valve body 36 descends (closes), and the flush water in the water storage tank 12 is supplied from the drain port 18 to the toilet body 8 of the flush toilet 4. be done.
At this time, the buoyancy of the float 172 in the small wash mode is smaller than the buoyancy in the large wash mode. It can be shorter than T1 (T2<T1).
As a result, the lowering time of the float 172 and the opening time of the valve body 36 in the small cleaning mode can be made shorter than the lowering time of the float 172 and the opening time of the valve body 36 in the large cleaning mode.
As a result, by changing the buoyancy acting on the float 172 according to the selected large wash mode or small wash mode, the balance position between the water level W1 in the water storage tank 12 and the float 172 is changed, and the water storage tank The lowering times T1, T2 of the float 172 associated with the lowering of the water level W1 in 12 can be changed.
Therefore, the flow rate of cleaning water per unit time (hereinafter "instantaneous flow rate") [L/min], which affects cleaning performance, is relatively high even in the small cleaning mode, which uses less cleaning water than the large cleaning mode. can be maintained. It is also possible to reduce the closing noise generated when the valve body 36 closes the drain port.

REFERENCE SIGNS LIST 1 drain valve device according to the first embodiment of the present invention 2 flush water tank device 4 flush toilet bowl 6 bowl portion 8 toilet body 8a water conduit 10 exterior tank 12 water storage tank (flushing water tank)
14 lid 16 heat insulator 18 drain port 20 water supply device 22 water supply pipe 24 valve unit 26 water supply float 28 discharge pipe 30 lever 32 operation device 34 operation lever 36 valve body 38 lifting operation part 40 outer rotating shaft 42 inner rotating shaft 44 rotation Main shaft portion 46 Cylindrical rotating portion 48 First rocking lever 50 Second rocking lever 52 First ball chain 54 Actuating shaft 56 Second ball chain 58 Switching valve (partition part) for switching between large and small cleaning
60 drain port forming part 60a overflow pipe 62 water reservoir 62a side wall part 66 valve seat 68 outflow hole 72 float 74 storage part 76 peripheral wall part 78 outflow port 100 drain valve device according to the second embodiment of the present invention 158 switching between large and small cleaning valve (partition)
172 Float 176 Peripheral wall portion 178 Communication port 180 Top surface portion 182 Lower opening portion 200 Drain valve device according to the third embodiment of the present invention 300 Drain valve device according to the fourth embodiment of the present invention 358 Switching valve for switching between large and small cleaning (partition )
362 Water storage tube 362a Side wall 368 First outflow hole 370 Second outflow hole A Air in the float A1 Rotation center axis A2 Rotation center axis DWL1 Minimum water level of water storage tank during large wash mode DWL2 Minimum water storage tank during small wash mode Water level Q1 Volume of air occupied in float 172 in large flush mode Q2 Volume of air occupied in float 172 in small flush mode T1 Water level in reservoir cylinder in large flush mode and float drop time T2 Water storage in small flush mode Water level in cylinder and float descending time W1 Water level in water storage tank W2 Water level in inner water storage cylinder

Claims (8)

A drain valve device provided in a flush water tank that supplies flush water to a flush toilet,
a valve body for opening and closing a drain provided at the bottom of the wash water tank;
an operating shaft provided with the valve body at a lower end portion and configured to open and close the valve body by moving up and down;
a water reservoir for vertically inserting the operating shaft and for storing part of the wash water in the wash water tank, the water reservoir having an outflow hole through which the wash water inside the wash water flows out to the outside; ,
a float that is arranged in the water reservoir and causes buoyancy obtained by the wash water in the water reservoir to act on the operating shaft;
When the float descends as the water level in the water reservoir decreases, the operating shaft and the valve body descend together with the float, and the valve body closes the drain port,
A large flush mode or the first flush water volume in which the flush water in the water storage tank is supplied from the drain port to the flush toilet at the first flush water volume during the period from when the valve body opens until it closes. any one of the small washing modes in which the amount of second washing water supplied is smaller than the second washing water can be selectively executed,
The drain valve device, wherein the float is constructed such that the buoyancy obtained in the small washing mode is smaller than the buoyancy obtained in the large washing mode. A portion of the float is provided with a storage section for storing cleansing water, and the amount of cleansing water that is stored in the small cleansing mode is greater than the amount of cleansing water that is stored in the large cleansing mode. 2. The drain valve assembly of claim 1, wherein the drain valve assembly is configured to be large. The storage part is provided on the upper part of the float. and a partition that can be opened and closed,
The partition section opens the outflow port of the peripheral wall portion in the large cleaning mode to allow the cleansing water in the storage portion to flow out from the outflow port, while in the small cleaning mode, the peripheral wall portion allows the cleansing water to flow out through the outflow port. 3. The drain valve device according to claim 2, wherein the reservoir serves as a water weight by closing the outlet and maintaining a state in which the cleaning water is stored in the reservoir. The float has a peripheral wall portion that surrounds a portion of the lower portion of the float so as to store wash water, and a communication port that is formed in a portion of the peripheral wall portion and communicates the inside and the outside of the float. , and a partition provided to be openable and closable with respect to the communication port,
The partition restricts communication of cleansing water or air between the inside and outside of the float by closing the communication port of the peripheral wall portion in the large cleaning mode, while the partition portion restricts communication of cleansing water or air between the inside and outside of the float by closing the communication port of the peripheral wall portion in the large cleaning mode. 2. The drain valve device according to claim 1, wherein the communication of cleaning water or air between the inside and outside of the float is enabled by opening the communication port. The float has a top surface portion that closes an upper region of the peripheral wall portion, and a lower opening that is formed along the lower edge of the peripheral wall portion. 5. The drain valve device according to claim 4, wherein the drain valve device is cylindrical, and the communication port is provided at a height position between the top surface portion and the lower opening portion. A drain valve device provided in a flush water tank that supplies flush water to a flush toilet,
a valve body for opening and closing a drain provided at the bottom of the wash water tank;
an operating shaft provided with the valve body at a lower end portion and configured to open and close the valve body by moving up and down;
a float that is connected to the operating shaft and causes buoyancy obtained by the wash water in the wash water tank to act on the operating shaft;
When the float descends as the water level in the wash water tank decreases, the operating shaft and the valve body move downward together with the float, and the valve body closes the drain port. ,
A large flush mode or the first flush water volume in which the flush water in the water storage tank is supplied from the drain port to the flush toilet at the first flush water volume during the period from when the valve body opens until it closes. any one of the small washing modes in which the amount of second washing water supplied is smaller than the second washing water can be selectively executed,
The drain valve device, wherein the float is constructed such that the buoyancy obtained in the small washing mode is smaller than the buoyancy obtained in the large washing mode. A washing water tank device comprising the drain valve device according to any one of claims 1 to 6. A flush toilet provided with the flush water tank device according to claim 7.

Images