JP7432118B2 - Drain valve device, flush water tank device, and flush toilet - Google Patents

Description

The present invention relates to a drain valve device, a flush water tank device, and a flush toilet, and in particular, a drain valve device provided in a flush water tank device that supplies flush water to a flush toilet, and the present invention includes the drain valve device. The present invention relates to a flush water tank device and a flush toilet equipped 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 drainage valve device that opens and closes a drain port of a flush water tank has been used. It is known that the drain valve is equipped with a valve and uses the buoyancy of a float to open and close the drain valve.
First, in the conventional drain valve device described in Patent Document 1 mentioned above, there is a valve body that opens and closes the drain port provided at the bottom of the wash water tank, and an operating shaft that opens and closes the valve body by moving up and down. a water storage cylinder through which the operating shaft is inserted in the vertical direction and which stores a portion of the washing water in the washing water tank; and a float disposed within the water storage cylinder to apply buoyancy to the operating shaft. There is.
In addition, in the conventional drain valve device described in Patent Document 1 mentioned above, the float is arranged in the water storage cylinder, so that the float does not affect the flow of wash water outside the water storage cylinder. 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 is different between large and small washes.

Next, the conventional drain valve device described in Patent Document 2 mentioned above is a so-called ball tap type drain valve device that is 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 washing is set to be longer than the opening time of the drain valve during small washing, so that the amount of washing water during large washing is greater than the amount of washing water during small washing. It is now possible to set it to a larger value.

Japanese Patent Application Publication No. 2014-185491 Japanese Patent Application Publication No. 2019-157601

However, in the conventional drain valve device described in Patent Document 1 mentioned above, while the opening time of the drain valve is set constant during each of large washing and small washing, the drain opening of the washing water tank is This causes a difference in the amount of washing water discharged.
As a result, especially during small washing, the flow rate per unit time (hereinafter referred to as "instantaneous flow rate") [L/min] of the washing water discharged from the drain port immediately after the drain valve opens is lower than that for large washing. Although the maximum value (so-called "drainage peak") is almost the same as that at the time of washing, the instantaneous flow rate [L/min] will decrease significantly after that while the drain valve is open compared to the time of deep cleaning. Maintaining the instantaneous flow rate [L/min] as high as possible has been a conventionally required issue in order to ensure good cleaning performance.
In addition, in the conventional drain valve device described in Patent Document 2 mentioned above, by using two floats, a float for large washing and a float for small washing, the drain valve is activated during each of large and small washing. Since the valve opening time is changed, the instantaneous flow rate [L/min] of the wash water discharged from the drain port can be maintained relatively high during small washes.
However, there is a problem that the higher the instantaneous flow rate [L/min] of the washing water discharged from the drain port is maintained, the louder the closing sound generated when the drain valve closes the drain port becomes. There is a problem in 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 inventors of the present invention maintained a relatively high instantaneous flow rate [L/min] of the wash water discharged from the drain port during a small wash, and suppressed the blockage that occurs when the drain valve closes the drain port. In order to reduce noise, we focused on changing the descending speed of the float as the water level in the water tank falls, depending on the selected large wash mode or small wash mode.
As a result, various means have been found that can change the float lowering time and the valve opening time of the valve body depending on the cleaning mode.

That is, the present invention was made in order to solve the above-mentioned conventional problems and problems of the conventional technology, and the water level in the water tank is adjusted depending on the selected large wash mode or small wash mode. By changing the descending speed of the float as it decreases, it is possible to maintain a relatively high instantaneous flow rate [L/min] of wash water discharged from the drain port during small washes, and the drain valve also It is an object of the present invention to provide a drain valve device, a flush water tank device, and a flush toilet that can reduce the closing noise generated when closing the toilet.

In order to solve the above-mentioned problems, the present invention provides a drain valve device provided in a flush water tank that supplies flush water to a flush toilet, the drain valve device being provided in a flush water tank that supplies flush water to a flush toilet. a valve body that opens and closes; an operating shaft that opens and closes the valve body by vertically moving the valve body; and an operating shaft that opens and closes the valve body by vertically moving the valve body; The water storage cylinder is arranged in the water storage cylinder and has a water storage cylinder that partially stores water and has an outflow hole that allows the cleaning water inside the water storage cylinder to flow out to the outside. a float that applies a buoyant force to the operating shaft, and when the float descends as the water level in the water tank decreases, the operating shaft and the valve body descend in conjunction with the float. , the valve body is configured to close the drain port, and from when the valve body opens to when the valve closes, flush water in the water storage tank flows from the drain port to the flush toilet. Either a large washing mode in which one washing water quantity is supplied or a small washing mode in which a second washing water quantity is supplied smaller than the first washing water quantity can be selectively executed, and the water tank or the The float is characterized in that it is configured to change the descending speed of the float as the water level in the water storage cylinder decreases depending on the selected large wash mode or small wash mode.
In the present invention configured in this way, when starting to clean the flush toilet, first select either the large flush mode or the small flush mode, and then turn the operating shaft of the drain valve device. By raising the valve body, the valve body is raised (opened), and the flush water in the flush water tank is supplied to the flush toilet from the drain port.
Then, the water level in the water tank is lowered depending on the selected large wash mode or small wash mode, and as the water level is lowered, the float in the water tank is lowered. As a result, the operating shaft of the drain valve device descends, causing the valve body to descend (close), stopping the supply of flush water from the flush water tank to the flush toilet, and completing flushing of the flush toilet. .
At this time, the water tank or float is configured to change the descending speed of the float as the water level in the water tank falls, depending on the selected large wash mode or small wash mode. Depending on the cleaning mode, the float lowering time and the valve opening time can be changed.
Therefore, the flow rate of cleaning water per unit time (hereinafter referred to as "instantaneous flow rate") [L/min], which affects cleaning performance, is relatively high even in the small cleaning mode, which has a smaller amount of cleaning water than the large cleaning mode. can be maintained.
Additionally, by changing the descending speed of the float as the water level in the water tank decreases, depending on the selected large flush mode or small flush mode, the closing noise generated when the valve body closes the drain port is reduced. can be done.

In the present invention, preferably, when the valve body is opened, the water storage cylinder has a total opening area of the outflow holes in the small washing mode, compared to a total opening area of the outflow holes in the large washing mode. The area is set to be large, and the amount of cleaning water per unit time in which the cleaning water in the water storage cylinder flows out from the outflow hole to the cleaning water tank is larger in the small cleaning mode than in the large cleaning mode. .
In the present invention configured in this manner, when the valve body is opened, the water storage cylinder has a total opening area of the outflow holes in the small washing mode compared to a total opening area of the outflow holes in the large washing mode. In small washing mode, the amount of washing water per unit time [L/min] (so-called "water draining speed") at which the washing water in the water storage cylinder flows out from the outflow hole to the washing water tank is smaller than in large washing mode. mode, the lowering speed of the float in the small cleaning mode can be made greater than the lowering speed of the float in the large cleaning 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, depending on the selected large wash mode or small wash mode, the amount of wash water per unit time [L/min] in which the wash water in the water tank flows out from the outflow hole to the wash water tank (so-called "water drain") By changing the "speed"), it is possible to change the descending speed of the float as the water level in the water tank decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Further, the closing noise generated when the valve body closes the drain port can also be reduced.

In the present invention, preferably, the water tank has a first outflow hole through which the wash water in the water tank flows out into the wash water tank in the large wash mode, and the wash water in the water tank in the small wash mode. a second outflow hole through which the water flows out into the wash water tank, and when the valve body is opened, the total opening area of each of the first outflow hole and the second outflow hole is the same as each other. , and the second outflow hole is arranged above the first outflow hole, and in the large wash mode, the wash water in the water storage cylinder flows out from the first outflow hole into the wash water tank. The amount of second cleaning water per unit time in which the cleaning water in the water reservoir flows out from the second outflow hole to the cleaning water tank in the small cleaning mode is larger than the amount of first cleaning water per unit time. is set to .
In the present invention configured in this manner, when the valve body is opened in the large cleaning mode, the cleaning water in the water storage cylinder flows out from the first outflow hole to the cleaning water tank, while in the small cleaning mode, the cleaning water flows out from the first outflow hole to the cleaning water tank. When the valve body is open, the wash water in the water storage cylinder flows out from the second outflow hole into the wash water tank.
At this time, even if the total opening area of each of the first outflow hole and the second outflow hole is the same, since the second outflow hole is arranged above the first outflow hole, water is stored in the large cleaning mode. Compared to the amount of first cleaning water per unit time [L/min] (so-called "first water drainage rate") in which the cleaning water in the cylinder flows out from the first outflow hole to the cleaning water tank, the amount of water in the water storage tank in the small cleaning mode is The amount of second cleaning water per unit time [L/min] (so-called "second water drainage rate") at which the cleaning water flows out from the second outflow hole into the cleaning water tank can be increased.
Therefore, the lowering speed of the float in the small cleaning mode can be made greater than the lowering speed of the float in the large cleaning mode. The lowering time of the float and the opening time of the valve body can be made shorter.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water per unit time [L/min] in which the wash water in the water tank flows out from the outflow hole to the wash water tank (so-called "water drain") By changing the "speed"), it is possible to change the speed at which the float descends as the water level in the water tank falls.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Further, the closing noise generated when the valve body closes the drain port can also be reduced.

In the present invention, preferably, the outflow hole includes a first outflow hole and a second outflow hole, and the water tank is configured to drain the wash water in the water tank to the first outflow hole in the large wash mode. While in the small wash mode, the wash water in the water tank is caused to flow out from both the first outflow hole and the second outflow hole into the wash water tank in the small wash mode.
In the present invention configured in this manner, when the valve body is opened in the large cleaning mode, the cleaning water in the water storage cylinder flows out from the first outflow hole to the cleaning water tank, while in the small cleaning mode, the cleaning water flows out from the first outflow hole to the cleaning water tank. When the valve body is opened, the wash water in the water storage cylinder flows out into the wash water tank from both the first outflow hole and the second outflow hole.
At this time, compared to the first wash water amount per unit time [L/min] (so-called "first water draining speed") in which the wash water in the water storage cylinder flows out from the first outflow hole to the wash water tank in the large wash mode. In the small washing mode, the amount of second washing water per unit time [L/min] (so-called "second water "Escape speed") can be increased.
Therefore, the descending speed of the float in the small cleaning mode can be made greater than the descending speed of the float in the large cleaning mode. The lowering time of the float and the opening time of the valve body can be made shorter.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water per unit time [L/min] in which the wash water in the water tank flows out from the outflow hole to the wash water tank (so-called "water drain") By changing the "speed"), it is possible to change the descending speed of the float as the water level in the water tank decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Further, the closing noise generated when the valve body closes the drain port can also be reduced.

In the present invention, preferably, the second outflow hole is arranged above the first outflow hole.
In the present invention configured in this way, when the valve body is opened in the large cleaning mode, the cleaning water in the water storage cylinder flows out only from the first outflow hole to the cleaning water tank, while in the small cleaning mode When the valve body is opened, the wash water in the water storage cylinder flows out into the wash water tank from both the first outflow hole and the second outflow hole.
At this time, since the second outflow hole is arranged above the first outflow hole, in the large cleaning mode, the cleaning water in the water tank flows out only from the first outflow hole to the cleaning water tank. Compared to the first wash water volume [L/min] (so-called "first water draining speed"), the wash water in the water storage cylinder flows out into the wash water tank from both the first outflow hole and the second outflow hole in the small wash mode. The amount of second washing water [L/min] per unit time (so-called "second water removal rate") can be increased.
Therefore, the descending speed of the float in the small cleaning mode can be made greater than the descending speed of the float in the large cleaning mode. The lowering time of the float and the opening time of the valve body can be made shorter.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water per unit time [L/min] in which the wash water in the water tank flows out from the outflow hole to the wash water tank (so-called "water drain") By changing the "speed"), it is possible to change the descending speed of the float as the water level in the water tank decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Further, the closing noise generated when the valve body closes the drain port can also be reduced.

In the present invention, preferably, the water reservoir includes a partition portion that closes a part of the outflow hole, and the partition portion is such that the total opening area of the outflow hole in the large wash mode is larger than the small wash mode. A portion of the outflow hole is closed so that the total opening area of the outflow hole is smaller than the total opening area of the outflow hole in the mode.
In the present invention configured as described above, the total opening area of the outflow holes in the large cleaning mode is larger than the total opening area of the outflow holes in the small cleaning mode by the partition portion that closes a part of the outflow holes of the water tank. Part of the outflow hole can be closed so that it is also smaller.
As a result, the amount of cleaning water per unit time [L/min] (so-called "water draining speed") in which the cleaning water in the water storage cylinder flows out from the outflow hole to the cleaning water tank is lower in the small cleaning mode than in the large cleaning mode. Therefore, the lowering speed of the float in the small cleaning mode can be made higher than the lowering speed of the float in the large cleaning mode.
Therefore, 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, depending on the selected large wash mode or small wash mode, the amount of wash water per unit time [L/min] in which the wash water in the water tank flows out from the outflow hole to the wash water tank (so-called "water drain") By changing the "speed"), it is possible to change the descending speed of the float as the water level in the water tank decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Further, the closing noise generated when the valve body closes the drain port can also be reduced.

In the present invention, preferably, the partition portion has a communication hole that allows communication between the inside of the water storage cylinder and the inside of the wash water tank while the outflow hole is closed, and that has a smaller opening cross-sectional area than the outflow hole. In the large washing mode, the partition part allows the washing water in the water storage cylinder to flow out from the communication hole into the washing water tank while the outflow hole is closed, while in the small washing mode In the mode, the outflow hole is opened and the wash water in the water storage cylinder is allowed to flow out from the entire outflow hole into the wash water tank.
In the present invention configured as described above, in the large cleaning mode, the partition closes the outflow hole, so that the washing water in the water tank is drained from the communication hole of the partition, which has a smaller opening cross-sectional area than the outflow hole. It can be drained into the wash water tank.
On the other hand, in the small wash mode, the partition part opens the outflow hole, so that the wash water in the water storage cylinder can flow out from the entire outflow hole into the wash water tank.
As a result, in the small washing mode, the amount of washing water per unit time [L/min] (so-called "water drainage rate") in which the washing water in the water storage cylinder flows out from the entire outflow hole to the washing water tank is the same as that of the water stored in the large washing mode. The amount of cleaning water in the cylinder flowing out from the communication hole in the partition to the cleaning water tank per unit time [L/min] (so-called "water drainage rate") is larger than that.
Therefore, the lowering speed of the float in the small cleaning mode can be made higher than the lowering speed of the float in the large cleaning mode.
Thereby, the valve opening time of the valve body in the small cleaning mode can be made shorter than the valve opening time of the valve body in the large cleaning mode.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water per unit time [L/min] in which the wash water in the water tank flows out from the outflow hole to the wash water tank (so-called "water drain") By changing the "speed"), it is possible to change the descending speed of the float as the water level in the water tank decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Further, the closing noise generated when the valve body closes the drain port can also be reduced.

Next, the present invention is a wash water tank device equipped with the above-mentioned drain valve device.
In the present invention configured in this way, by changing the descending speed of the float as the water level in the water tank decreases, depending on the selected large washing mode or small washing mode, the water can be removed from the drain port during small washing. Equipped with a drain valve device that can maintain a relatively high instantaneous flow rate [L/min] of discharged wash water and reduce the closing sound generated when the valve body closes the drain port. A wash water tank device can be provided.

Next, the present invention is a flush toilet equipped with the above-mentioned flush water tank device.
In the present invention configured in this way, by changing the descending speed of the float as the water level in the water tank decreases, depending on the selected large washing mode or small washing mode, the water can be removed from the drain port during small washing. A cleaning device that has a drain valve device that can maintain a relatively high instantaneous flow rate [L/min] of discharged cleaning water and reduce the closing sound generated when the valve body closes the drain port. A flush toilet equipped with a water tank device can be provided.

According to the drain valve device, flush water tank device, and flush toilet of the present invention, the descending speed of the float as the water level in the water tank decreases is changed depending on the selected large flush mode or small flush mode. This makes it possible to maintain a relatively high instantaneous flow rate [L/min] of wash water discharged from the drain port during small washes, and reduces the closing noise that occurs when the drain valve closes the drain port. can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 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, as viewed diagonally from above. FIG. 1 is a front sectional view of a wash water tank device including a drain valve device according to a first embodiment of the present invention. 1 is a schematic diagram showing the 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 opening of the valve in a deep cleaning mode and closing of the valve. 1 is a schematic diagram showing the 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 washing mode when the valve starts to open and closes. FIG. 7 is a schematic diagram showing the configuration of a drain valve device according to a second embodiment of the present invention, and a series of operations from a standby state to opening the valve in a deep cleaning mode to closing the valve. FIG. 7 is a schematic diagram showing the configuration of a drain valve device according to a second embodiment of the present invention, and a series of operations from a standby state to a small cleaning mode when the valve starts opening and closes. FIG. 7 is a schematic diagram showing the configuration of a drain valve device according to a third embodiment of the present invention, and a series of operations from a standby state to opening the valve in a deep cleaning mode and closing the valve. FIG. 7 is a schematic diagram showing the configuration of a drain valve device according to a third embodiment of the present invention, and a series of operations from a standby state to a small washing mode when the valve starts to open and closes. It is a conceptual diagram of the structure of the drain valve apparatus by 4th Embodiment of this invention, and the state when the float is descending after opening of a valve is started by deep washing mode. It is a conceptual diagram of the structure of the drain valve apparatus by 4th Embodiment of this invention, and the state when the float is descending after opening of a valve is started by small washing mode.

Hereinafter, some embodiments of a drain valve device of the present invention, a flush water tank device equipped with this drain valve device, and a flush toilet equipped with this flush water tank device 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 equipped with 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 4, to which a drain valve device 1 according to a first embodiment of the present invention is applied, as viewed diagonally from above. Further, FIG. 2 is a front sectional view of a wash water tank device 2 equipped with a drain valve device 1 according to the first embodiment of the present invention.

As shown in FIGS. 1 and 2, a flush toilet 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 toilet bowl made of ceramic that forms a bowl portion 6. It has a main body 8.
A wash water tank device 2, the details of which will be described later, is provided on the rear side of the upper surface of the toilet main body 8. When the wash water stored in the wash water tank device 2 is supplied to the toilet body 8 of the flush toilet 4 by the operation of the drain valve device 1 of this embodiment, the inside of the bowl portion 6 is cleaned. It has become.
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, the filth in the bowl part 6 is sucked in using a siphon action, A so-called "siphon-type flush toilet" may be applied, in which water is discharged to the outside at once from a drainage trap section (not shown) on the downstream side, or the water is discharged by the head of the water in the bowl section 6. A form of a so-called "flushing type flush toilet", which flushes out waste by action, may be applied.

Next, with reference to FIG. 2, a schematic configuration of a wash water tank device 2 to which the drain valve device 1 of this 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 which is a flush water tank disposed inside the exterior tank 10 and stores flush water for flushing a toilet bowl, and an exterior tank. The lid body 14 is placed above the lid body 10.
First, the water storage tank 12 is attached to the exterior tank 10 via a heat insulator 16 that surrounds its outer periphery.
Furthermore, a drain port 18 is provided at the bottom of each of the water storage tank 12 and the exterior tank 10, which communicates with the water conduit 8a of the toilet main body 8. This drain port 18 can be opened and closed by the drain valve device 1 of this embodiment, which will be described in detail later.
Regarding the lid body 14 of the washing water tank device 2 of this embodiment, a form will be described in which no means for hand washing, such as a hand washing bowl part (hand washing bowl) or a hand washing collar, is provided on the top surface of the lid body 14. , it is also applicable even if these means are provided for hand washing.

Next, as shown in FIG. 2, the wash water tank device 2 includes a water supply device 20 that supplies wash 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 to the valve unit 24, and receives cleaning water supplied from the water supply source (not shown) such as an external water pipe. can be supplied to the valve unit 24.
Next, 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, thereby controlling the water supply valve (not shown) of the valve unit 24. It is designed to open and close.
Further, the water discharge pipe 28 is connected to the downstream side of the valve unit 24, and when a water supply valve (not shown) is opened and closed, the water discharge pipe 28 discharges cleaning water from the valve unit 24 into the water storage tank 12 (water is discharged and water is stopped). water supply and water shutoff).

Next, as shown in FIG. 2, the wash water tank device 2 includes an operating device 32 that opens and closes the drain valve device 1.
This operating device 32 includes an operating lever 34 that is manually rotated by the user, an operating section (lifting section 38) that pulls up the valve body 36 of the drain valve device 1, and the operating lever 34 and the lifting section 38. A plurality of rotating shafts (an outer rotating shaft 40 and an inner rotating shaft 42) are respectively provided.

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

Next, the upper end of the lifting actuator 38 is fixed to the upper end and center side of the water storage tank 12.
This lifting operation part 38 includes a rotating main shaft part 44 connected to the other end side (inner end side) of the inner rotating shaft 42, a cylindrical rotating part 46 provided on the outer peripheral side of this rotating main shaft part 44, It is equipped with This cylindrical rotating portion 46 can rotate around the rotational center axis A2 integrally with the rotational main shaft portion 44 when the rotational main shaft portion 44 rotates around the rotational center axis A2.
Further, the cylindrical rotating part 46 is connected to a first swing lever 48 that is involved in lifting up the valve body 36 of the drain valve device 1 when opening the valve body 36 of the drain valve device 1 in order to start flushing the toilet bowl. A second swing lever 50 that is involved in switching the cleaning mode to either the large cleaning mode or the small cleaning mode.
Further, the first swing lever 48 is connected to the upper side of a first chain 52, and the lower side of this first chain 52 operates (directly) the valve body 36 of the drain valve device 1, which will be described in detail later. The upper end of the operating shaft 54 is connected to the upper end of the actuating shaft 54 for moving the motor.
On the other hand, the second swing lever 50 is connected to the upper side of a second chain 56, and the lower side of the second chain 56 is connected to a partition for switching between large and small cleaning of the drain valve device 1, which will be described in detail later. (Switching valve 58 for switching between large and small washes).

For example, when starting toilet flushing in the large flush mode, the operating lever 34 shown in FIG. 2 is rotated by a predetermined angle (e.g., 90 degrees) to one side (to the front side in FIG. 2) around the rotation center axis A1. Then, the outer rotation shaft 40 and the inner rotation shaft 42 connected to the operating lever 34 rotate to one side, and the rotation main shaft portion 44 of the lifting actuator 38 rotates to one side around the rotation center axis A2. It has become.
As a result, the cylindrical rotating portion 46 of the pulling actuating portion 38 also rotates to one side (the front side in FIG. 2) around the rotational center axis A2 integrally with the rotating main shaft portion 44, and the first swinging lever 48 swings (rotates) to one side (the front side in FIG. 2) so as to pull up the first chain 52, and the second swing lever 50 swings (rotates) to one side (the front side in FIG. 2) to pull up the second chain 56. It is designed to swing (rotate) toward the front side of 2).
On the other hand, when starting toilet bowl flushing in the small flush mode, the operating 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 rotary shaft 40 and the inner rotary shaft 42 connected to the operating lever 34 rotate to the other side, and the rotational main shaft portion 44 of the lifting actuator 38 rotates to the other side around the rotation center axis A2. It has become.
As a result, the cylindrical rotating portion 46 of the pulling actuating portion 38 also rotates integrally with the rotating main shaft portion 44 around the rotation center axis A2 to the other side (backward side in FIG. 2), and the first swinging lever 48 swings (rotates) to the other side (inner side in FIG. 2) so as to pull up the first chain 52, while the second swing lever 50 does not swing and moves toward the other side (back side in FIG. 2). The two-bead chain 56 cannot be pulled up.

In this embodiment, a mode in which the user manually operates the operating lever 34 as the operating device 32 for operating the drain valve device 1 will be described, but the present invention is not limited to this mode, and can be applied to other modes as well. It is possible.
For example, as another form of the operating device, the controller electrically controls the operation of the drive section (motor, etc.) of the lifting operation section based on a signal input by the user using an operation button or the like. The lifting operation of the valve body 36 of the drain valve device 1 using the first swing lever 48 and the switching operation between the large and small cleaning modes using the second swing lever 50 may be performed automatically.
Further, each of the chains 52 and 56 of the drain valve device 1 of the present embodiment may be a linear wire member.

Next, details of the drain valve device 1 of this embodiment will be explained 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 opening of the valve in the deep cleaning mode and the closing of the valve.
Moreover, 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 opening of the valve in the small wash mode and the closing of the valve.
Here, in each state (I) to (VI) of the drain valve device 1 in each of the large cleaning mode and the small cleaning mode shown in FIGS. 3A and 3B, the state (I) to (VI) before the valve body 36 starts opening is Thereafter, the open state of the valve body 36 is defined as state (II) to (V) in chronological order, and the closed state of the valve body 36 is defined as state (VI).

First, as shown in FIG. 2, the drain valve device 1 of this embodiment includes a drain port forming part 60 that is attached to the bottom surface of the water storage tank 12 and forms the drain port 18, and a drain port forming part 60 that is attached to the bottom surface of the water storage tank 12 and forms the drain port 18. It includes a water storage cylinder 62 and an overflow pipe 64 attached to the drain port forming part 60 so as to communicate with the drain port 18.
Next, as shown in FIG. 2, the drain valve device 1 includes a valve seat 66 formed at the upper edge of the drain port 18, and a valve seat 66 that is provided so as to be able to close the valve seat 66 and to be movable upwardly. The valve body 36 includes a valve body 36 and an operating shaft 54 that is provided at the lower end of the valve body 36 and opens and closes the valve body 36 by vertically moving (vertically moving) the valve body 36 . This operating shaft 54 is provided so as to be inserted into the water storage cylinder 62 in the vertical direction.
Further, the water storage cylinder 62 is configured to store a part of the washing water in the water storage tank 12, and the left and right side walls 62a are provided with the washing water in the water storage cylinder 62 to the outside (inside the water storage tank 12). A first outflow hole 68 and a second outflow hole 70 are provided, respectively.
Furthermore, a float 72 is arranged within the water storage cylinder 62. This float 72 is provided concentrically on the outer circumferential side of the operating shaft 54, and moves in conjunction (up and down) with the water level in the water storage cylinder 62, and transfers the buoyancy obtained from the wash water in the water storage cylinder 62 to the operating shaft 54. It is now possible to act on

Next, as shown in FIG. 2, a second outflow hole 70 on one side of the left and right side walls 62a of the water storage cylinder 62 (on the right side when looking at the water storage cylinder 62 from the front side in FIG. 2) has a large and small washing switching hole. A partition portion (switching valve 58) is provided so as to be openable and closable.
As shown in FIG. 3A, this partition part (switching valve 58) is operated by the second chain 56 being pulled up by the second swinging lever 50 when the toilet bowl is flushed in the large flush mode. The second outflow hole 70 can be closed.
On the other hand, as shown in FIG. 3B, the second chain 56 of the partition (switching valve 58) is not pulled up by the second swinging lever 50 when flushing the toilet bowl in the small flush mode. This allows the second outflow hole 70 to be opened.

That is, as shown in states (II) to (V) of FIG. 3A, when the valve body 36 is opened in the large cleaning mode, the first outflow hole 68 is always open, and the second outflow hole 70 is always open. is closed by the switching valve 58.
On the other hand, as shown in states (II) to (V) of FIG. 3B, when the valve body 36 is opened in the small cleaning mode, the first outflow hole 68 is always open, and the second outflow hole 70 is always open. is opened by the switching valve 58.
As a result, the total opening area S2 of the outflow holes 68, 70 when the valve body 36 is opened in the small cleaning mode shown in states (II) to (V) of FIG. 3B is the same as that of states (II) to (V) of FIG. ) is set to be larger than the total opening area S1 of the outflow holes 68, 70 of the water storage cylinder 62 when the valve body 36 is opened in the large cleaning mode (S2<S1).
Therefore, in the small cleaning mode, when the valve body 36 is open, the cleaning water in the water storage cylinder 62 flows out from each outlet hole 68, 70 to the water storage tank 12, the amount of cleaning water per unit time Q2 [L/min] (so-called " Water draining speed Q2'') is the amount of cleaning water per unit time Q1 [L /min] (so-called "water draining speed Q1") (Q2>Q1).

Here, in each state (I) to (VI) of FIGS. 3A and 3B, the water level in the water storage tank 12 is indicated by symbol W1, and the water level in the water storage cylinder 62 is indicated by symbol W2. The amount of cleaning water Q2 per unit time that flows out into the water storage tank 12 from each of the outflow holes 68 and 70 of the cylinder 62 is the same as that per unit time that flows out into the water storage tank 12 only from the first outflow hole 68 of the water storage cylinder 62 in the large cleaning mode. (Q2>Q1), the lowering speed v2 when the water level W2 in the water tank 62 in the small wash mode falls is also lower than the water level W1 in the water tank 62 in the large wash mode. The descending speed when descending is set to be greater than v1 (v2>v1).
As a result, the descending speed v2 of the float 72 when the float 72 descends in conjunction with the lowering of the water level in the water tank 62 during the small washing mode also becomes greater than the descending speed v1 of the float 72 during the large washing mode. (v2>v1).

Next, the operation of the drain valve device 1 according to the first embodiment of the present invention will be explained with reference to FIGS. 2 to 3B.
First, the large cleaning mode executed 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.
When starting the deep cleaning mode from the standby state (I) in FIGS. 2 and 3A, for example, if the user rotates the operating lever 34 shown in FIG. 2 90 degrees toward the front, the initial position shown in FIG. The first swing lever 48 and the second swing lever 50 in the state (standby state) are each swung, and the first chain 52 and the second chain 56 are each pulled up.
As a result, the operating shaft 54 and the valve body 36 of the drain valve device 1 are pulled up and moved directly upward via the first chain 52, and the float 72 is also pulled up integrally via the operating shaft 54. (See state (II) in FIG. 3A).
Further, by lifting a part of the partition part (switching valve 58) for switching between large and small cleaning of the drain valve device 1 through the second chain 56, this switching valve 58 is moved to the second outflow hole 70 of the water storage cylinder 62. (See state (II) in FIG. 3A).

At this time, as shown in state (II) of FIG. 3A, the float 72 and the valve body 36 are raised to the highest position, the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water is stored. Draining of the wash water from inside the tank 12 to the drain port 18 is started.
Thereafter, as shown in state (III) of FIG. 3A, after the water level W1 in the water storage tank 12 drops to near the upper end of the water storage cylinder 62, when the water level becomes lower than the upper end of the water storage cylinder 62, Since the water pressure due to the water level W2 in the tank 62 exceeds the water pressure due to the water level W1 in the water storage tank 12 on the outside, the cleaning water in the water storage cylinder 62 flows from the first outflow hole 68 into the water storage tank 12 on the outside. leak.
As shown in state (IV) of FIG. 3A, the water level W2 in the water storage cylinder 62 is higher than the water level W1 in the water storage tank 12 outside thereof, but the cleaning water in the water storage cylinder 62 is Since the water continues to flow out from the first outflow hole 68, the water level W2 in the water storage cylinder 62 gradually decreases, and the float 72 also decreases in conjunction with the decrease in the water level W2.

Next, as shown in state (V) in FIG. 3A, when the water level W1 in the water storage tank 12 outside the water storage cylinder 62 falls below the upper end of the first outflow hole 68 of the water storage cylinder 62, the water storage cylinder 62 The outside of the first outflow hole 68 is exposed to the atmosphere.
As a result, the speed at which the cleaning water in the water storage cylinder 62 flows out from the first outflow hole 68 is increased, and the water level W2 in the water storage cylinder 62 further decreases, so that the float 72 also lowers, and the operating shaft 54 and valve The body 36 also descends integrally.
Then, as shown in state (VI) of FIG. 3A, when the valve body 36 contacts the valve seat 66, the drain port 18 is closed.
As a result, drainage of the flushing water from inside the water storage tank 12 to the drain port 18 is stopped, and the supply of flushing water from the flushing water tank device 2 to the toilet main body 8 in the large flushing mode is ended.
At this time, the float 72, the operating shaft 54, and the valve body 36 are in a stopped state, but the lowest water level DWL1 in the water storage tank 12 (so-called "dead water line" water level at which drainage is stopped) is the same as that of the water storage cylinder 62. It is located below the lower end of the first outflow hole 68. Therefore, the cleaning water in the water storage cylinder 62 continues to flow out from the first outflow hole 68 to the water storage tank 12 side, and only the water level W2 in the water storage cylinder 62 gradually decreases, and the water pressure in the water storage cylinder 62 also decreases. descend.
At this time, the switching valve 58 that closes the second outflow hole 70 of the water storage cylinder 62 changes from the closed state due to the water pressure of the wash water in the water storage cylinder 62 to the water pressure inside the water storage cylinder 62. By lowering, the second outflow hole 70 is actuated (rotated) in a direction to open it, and becomes in an open state.
That is, the switching valve 58 is in a state in which the second outflow hole 70 is opened in a standby state after the end of the large cleaning mode until the next cleaning mode is started.

Next, the small wash mode executed 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, if the user rotates the operating lever 34 shown in FIG. 2 90 degrees to the back, the initial position shown in FIG. Only the first swinging lever 48 in the state (standby state) is swung, and only the first chain 52 is pulled up.
As a result, the operating shaft 54 and the valve body 36 of the drain valve device 1 are pulled up and moved directly upward via the first chain 52, and the float 72 is also pulled up integrally via the operating shaft 54. (See state (II) in FIG. 3B).
On the other hand, since the second swinging lever 50 is not swung, the second chain 56 is also not pulled up, and the switching valve 58 for switching between large and small washes always opens the second outflow hole 70 of the water tank 62. The current state will be maintained.
Note that the state in which the switching valve 58 is always open is maintained from then on until the small wash mode ends (see states (II) to (VI) in FIG. 3B).

Further, as shown in state (II) of FIG. 3B, the float 72 and the valve body 36 are in a state of being raised to the highest position, the drain port 18 of the water storage tank 12 is opened by the raised valve body 36, and the water storage tank Draining of the wash water from inside 12 to drain port 18 is started.
Thereafter, as shown in state (III) of FIG. 3B, after the water level W1 in the water storage tank 12 drops to near the upper end of the water storage cylinder 62, when the water level becomes lower than the upper end of the water storage cylinder 62, Since the water pressure due to the water level W2 in the tank 62 exceeds the water pressure due to the water level W1 in the water storage tank 12 outside thereof, the cleaning water in the water storage cylinder 62 flows from the first outflow hole 68 and the second outflow hole 70, respectively. The water flows out into the water storage tank 12 on the outside thereof.
As shown in states (IV) and (V) of FIG. 3B, the water level W2 in the water storage cylinder 62 is higher than the water level W1 in the water storage tank 12 outside thereof; Since the wash water continues to flow out from each of the outflow holes 68 and 70, the water level W2 in the water tank 62 gradually decreases, and the float 72 also decreases in conjunction with the decrease in the water level W2.

At this time, the amount of cleaning water Q2 per unit time flowing out from each outlet hole 68, 70 of the water storage cylinder 62 into the water storage tank 12 in the small cleaning mode shown in states (IV) and (V) of FIG. 3B is the same as that of FIG. 3A. The amount of cleaning water per unit time Q1 that flows out into the water storage tank 12 only from the first outflow hole 68 of the water storage cylinder 62 during the large cleaning mode shown in states (IV) and (V) is larger (Q2>Q1).
As a result, the water level W2 in the water storage cylinder 62 and the descending speed v2 when the float 72 descends in the small washing mode are lower than the water level W1 in the water storage cylinder 62 and the descending speed v2 when the float 72 descends in the large washing mode. The speed becomes larger than v1 (v2>v1).

Then, as shown in state (VI) of FIG. 3B, when the valve body 36 comes into contact with the valve seat 66, the drain port 18 is closed, and drainage of the wash water from the water storage tank 12 to the drain port 18 is stopped. Ru.
As a result, the supply of wash water from the wash water tank device 2 to the toilet main body 8 in the small wash mode is ended.
At this time, the lowest water level DWL2 in the water storage tank 12 in the small wash mode in the state (VI) of FIG. 3B (so-called "dead water line" water level at which drainage is stopped) is the same as the large wash water level in the state (VI) of FIG. 3A. It is located above the lowest water level DWL1 in the water storage tank 12 during mode.
In other words, the amount of cleaning water drained from the water storage tank 12 to the drain port 18 during the minor cleaning mode is increased by the amount that the lowest water level DWL2 in the minor cleaning mode exceeds the lowest water level DWL1 in the major cleaning mode. This will be less than the amount of washing water drained from the tank 12 to the drain port 18.

According to the drain valve device 1 according to the first embodiment of the present invention described above, when starting to clean the flush toilet 4, first, the cleaning mode, either the large flush mode or the small flush mode, is selected and then By raising the operating shaft 54 of the drain valve device 1, the valve body 36 rises (opens), and the flush water in the water storage tank 12 of the flush water tank device 2 flows from the drain port 18 to the flush toilet bowl 4. It is supplied to the toilet bowl main body 8.
Then, the water level W2 in the water tank 62 is lowered depending on the selected large wash mode or small wash mode, and as the water level W2 is lowered, the float 72 in the water tank 62 is lowered.
As a result, the operating shaft 54 of the drain valve device 1 is lowered, so that the valve body 36 is lowered (closed), and the supply of flush water from the water storage tank 12 to the flush toilet 4 is stopped. cleaning is completed.
At this time, the descending speeds v1 and v2 of the float 72 as the water level in the water tank 62 decreases can be changed depending on the selected large wash mode or small wash mode. The lowering time of the float 72 and the opening time of the valve body 36 can also be changed.
Therefore, the flow rate of cleaning water per unit time (instantaneous flow rate) [L/min], which affects cleaning performance, should be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Can be done.
In addition, by changing the descending speeds v1 and v2 of the float 72 as the water level in the water tank 62 decreases, depending on the selected large wash mode or small wash mode, when the valve body 36 closes the drain port 18, It is possible to reduce the closing noise generated in the

Further, according to the drain valve device 1 according to the present embodiment, the total opening area S2 of the outflow holes 68 and 70 of the water storage cylinder 62 in the small washing mode when the valve body 36 is opened is It is set to be larger than the total opening area S1 of the outflow holes 68 of the water storage cylinder 62 in the large cleaning mode (S2>S1).
As a result, the amount of cleaning water per unit time Q2 [L/min] (so-called "Water draining speed Q2") is the amount of cleaning water Q1 [ L/min] (so-called "water removal speed Q1"), the descending speed v2 of the float 72 in the small cleaning mode can be made larger than the descending speed v1 of the float 72 in the large cleaning mode ( v2>v1).
Thereby, the descending time of the float 72 and the valve opening time of the valve body 36 in the small cleaning mode can be made shorter than the descending time of the float 72 and the valve opening time of the valve body 36 in the large cleaning mode.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water Q1, Q2 [L/ min] (so-called "water draining speeds Q1, Q2"), it is possible to change the descending speeds v1, v2 of the float 72 as the water level in the water tank 62 decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode.
Moreover, the closing noise generated when the valve body 36 closes the drain port 18 can also be reduced.

Furthermore, according to the drain valve device 1 according to the present embodiment, when the valve body 36 is opened in the large cleaning mode, the cleaning water in the water storage cylinder 62 flows out from the first outflow hole 68 to the cleaning water tank. When the valve body 36 is opened in the small wash mode, the wash water in the water storage cylinder 62 flows out into the water storage tank 12 from both the first outflow hole 68 and the second outflow hole 70.
At this time, in the large washing mode, the first washing water amount Q1 [L/min] per unit time in which the washing water in the water storage cylinder 62 flows out from the first outflow hole 68 to the water storage tank 12 (so-called "first water draining speed Q1 ''), the amount of second cleaning water per unit time Q2 [L/ min] (so-called "second water draining speed Q2").
Therefore, since the descending speed v2 of the float 72 in the small cleaning mode can be made larger than the descending speed v1 of the float 72 in the large cleaning mode, the descending time of the float 72 in the small cleaning mode and the opening time of the valve body 36 can be increased. The valve time can be made shorter than the descending time of the float 72 and the opening time of the valve body 36 in the large cleaning mode.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water Q1, Q2 [L/ min] (so-called "water draining speeds Q1, Q2"), it is possible to change the descending speeds v1, v2 of the float 72 as the water level in the water tank 62 decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode.
Moreover, the closing noise generated when the valve body 36 closes the drain port 18 can also be reduced.

Further, according to the drain valve device 1 according to the present embodiment, the large and small washing switching valve 58 that closes a part of the outflow holes 68 and 70 (the second outflow hole 70) of the water storage cylinder 62 is used for large and small washing. Some of the outflow holes 68 and 70 (the second outflow hole 70 ) can be closed.
As a result, the amount of cleaning water per unit time Q2 [L/min] (so-called "Water draining speed Q2") is the amount of cleaning water Q1 [ L/min] (so-called "water removal speed Q1") (Q2>Q1), the descending speed v2 of the float 72 in the small cleaning mode is made larger than the descending speed v1 of the float 72 in the large cleaning mode. (v2>v1).
Therefore, the lowering time of the float 72 and the valve 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 valve opening time of the valve body 36 in the large cleaning mode.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water Q1, Q2 [L/ min] (so-called "water draining speeds Q1, Q2"), it is possible to change the descending speeds v1, v2 of the float 72 as the water level in the water tank 62 decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Moreover, the closing noise generated when the valve body 36 closes the drain port 18 can also be reduced.

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 a drain valve device according to a second embodiment of the present invention, and a series of operations from the standby state to the opening of the valve in the deep cleaning mode and the closing of the valve. Moreover, 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 opening of the valve in the small washing mode and the closing of the valve.
Here, in the drain valve device 100 according to the second embodiment of the present invention shown in FIGS. 4A and 4B, the same parts as the drain valve device 1 according to the first embodiment of the present invention described above are given the same reference numerals, Descriptions 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 water storage cylinder 162 includes a single outflow hole 168 in the side wall portion 162a on one of the left and right sides thereof. There is.
Further, the outflow hole 168 of the water storage cylinder 162 is provided with a partition part (switching valve 158) for switching between large and small washes so as to be openable and closable. The switching valve 158 can open and close the outflow hole 168 by sliding in the vertical direction according to the vertical movement of the second chain 56.
Furthermore, in the drain valve device 100 of the present embodiment, the switching valve 158 includes a communication hole 170 that allows communication between the inside of the water storage cylinder 162 and the inside of the water storage tank 12 while the outflow hole 168 is closed. . The communication hole 170 is set to have a smaller opening cross-sectional area than the outflow hole 168.
Furthermore, in the drain valve device 100 of this embodiment, even when the outflow hole 168 of the water storage cylinder 162 is closed by the switching valve 158, the communication hole 170 connects the inside of the water storage cylinder 162 and the inside of the water storage tank 12. These structures are different from the structure of the drain valve device 1 according to the first embodiment of the present invention described above.

Next, the 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) of FIGS. 4A and 4B, the switching valve 158 opens the outflow hole 168 of the water storage cylinder 162.
When the large cleaning mode is started from the standby state shown in state (I) of FIG. 4A, the operating shaft 54 and the valve body 36 are moved by the first chain 52 in state (II) of FIG. be pulled upwards.
At this time, the switching valve 158 also slides upward by being pulled upward by the second chain 56, and the outflow hole 168 of the water reservoir 162 is closed by the switching valve 158 (see state (II) in FIG. 4A). ).

Note that the state in which the outflow hole 168 of the water storage cylinder 162 is closed by the switching valve 158 changes from the subsequent state (III) in FIG. 4A to the state in FIG. 4A in which the valve body 36 closes and the large cleaning mode ends. (VI).
However, as shown in states (II) to (VI) of FIG. 4A, even when the outflow hole 168 of the water storage cylinder 162 is closed by the switching valve 158, the communication hole 170 is connected between the inside of the water storage cylinder 162 and the water storage tank. 12 are in constant communication.
Then, as shown in states (IV) to (VI) of FIG. 4A, when the water level W1 in the water storage tank 12 outside the water storage cylinder 162 becomes lower than the water level W2 in the water storage cylinder 162, the water pressure in the water storage cylinder 162 is higher than the water pressure inside the water storage tank 12, so even if the outflow hole 168 of the water storage cylinder 162 is closed by the switching valve 158, the pressure difference between the inside of the water storage cylinder 162 and the outside of the water storage tank 12 This allows the wash water in the water storage cylinder 162 to flow out into the water storage tank 12 through the communication hole 170.

On the other hand, when the small cleaning mode is started from the standby state shown in state (I) of FIG. 4B, the operating shaft 54 and the valve body 36 are moved upward by the first chain 52 in state (II) of FIG. be lifted up.
On the other hand, the switching valve 158 is neither pulled up nor slid upward by the second chain 56, so the outflow hole 168 of the water reservoir 162 is opened by the switching valve 158 (see FIG. 4B). (see condition (II)).
The outflow hole 168 of the water tank 162 is kept open at all times by the switching valve 158 from the standby state (I) in FIG. 4B to the state (VI) where the small wash mode ends in FIG. 4B.
Incidentally, in the state (VI) of FIG. 4B where the small wash mode has ended, the lowest water level DWL2 in the water storage tank 12 in the small wash mode is the same as that in the water storage tank 12 in the large wash mode in the state (VI) of FIG. 4A. It will be located above the lowest water level DWL1.

According to the drain valve device 100 according to the second embodiment of the present invention described above, in the large washing mode shown in FIG. The wash water in the water storage cylinder 162 can be made to flow out into the water storage tank 12 through the communication hole 170 of the switching valve 158, which has a smaller opening cross-sectional area than the outflow hole 168.
On the other hand, in the small wash mode shown in FIG. 4B, the switching valve 158 always opens the outflow hole 168, so that the wash water in the water storage cylinder 162 can flow out from the entire outflow hole 168 into the water storage tank 12.
As a result, the amount of cleaning water per unit time Q2 [L/min] (so-called "water draining speed Q2") in which the cleaning water in the water storage cylinder 162 flows out from the entire outflow hole 168 to the water storage tank 12 in the small cleaning mode is as follows. In the large cleaning mode, the amount of cleaning water in the water storage cylinder 162 flowing out from the communication hole 170 of the switching valve 158 to the water storage tank 12 is larger than the amount of cleaning water Q1 [L/min] (so-called "water removal rate Q1") per unit time. (Q2>Q1).
Therefore, the descending speed v2 of the float 72 in the small cleaning mode can be made greater than the descending speed v1 of the float 72 in the large cleaning mode.
Thereby, the valve opening time of the valve body 36 in the small cleaning mode can be made shorter than the valve opening time of the valve body 36 in the large cleaning mode.
As a result, the amount of cleaning water Q1, Q2 [L/min] per unit time when the cleaning water in the water tank 162 flows out from the outflow hole 168 to the water storage tank 12 is determined according to the selected large cleaning mode or small cleaning mode. By changing the so-called "water draining speeds Q1, Q2", it is possible to change the descending speed of the float 72 as the water level in the water tank 162 decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Moreover, the closing noise generated when the valve body 36 closes the drain port 18 can also be reduced.

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 a drain valve device according to a third embodiment of the present invention, and a series of operations from the standby state to the opening of the valve in the deep cleaning mode and the closing of the valve. Moreover, FIG. 5B is a schematic diagram showing the configuration of a drain valve device according to a third embodiment of the present invention, and a series of operations from the standby state to the start of opening of the valve in the small washing mode and the closing of the valve.
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 device 1, 100 according to the first and second embodiments of the present invention described above are the same. Reference numerals are given, and explanations thereof will be omitted.

First, as shown in FIGS. 5A and 5B, in the drain valve device 200 according to the third embodiment of the present invention, the water storage cylinder 262 has a first outflow disposed below in the side wall portion 162a on one of the left and right sides thereof. A hole 268 and a second outflow hole 270 arranged above the first outflow hole 268 are provided.
Further, the second outflow hole 270 of the water storage cylinder 262 is provided with a partition part (switching valve 258) for switching between large and small washes so as to be openable and closable. The switching valve 258 can open and close the second outflow hole 270 by rotating from a horizontal position to a vertical position according to the vertical movement of the second chain 56.
As a result, in the large cleaning mode shown in FIG. 5A, the second outflow hole 270 of the water storage cylinder 262 is closed by the switching valve 258, so that the cleaning water in the water storage cylinder 262 is stored only from the first outflow hole 268 below. It is designed to be drained into a tank 12.
On the other hand, in the small wash mode shown in FIG. 5B, the second outflow hole 270 of the water storage cylinder 262 is opened by the switching valve 258, so that the washing water in the water storage cylinder 262 flows through the first outflow hole 268 and the second outflow hole 270. The water flows out into the water storage tank 12 from both sides.
Furthermore, when the valve body 36 is opened, the total opening area S1 of the water storage cylinder 262 is larger than that of the first outflow hole 268 and the second outflow hole in the small washing mode, compared to the total opening area S1 of only the first outflow hole 268 in the large washing mode. The total opening area S2 of the hole 270 is set to be large.
As a result, the amount of cleaning water per unit time Q2 [L/min] (so-called "water leakage") in which the cleaning water in the water storage cylinder 262 flows out from the first outflow hole 268 and the second outflow hole 270 to the water storage tank 12 during the small cleaning mode. "speed Q2") is the amount of cleaning water per unit time Q1 [L/min] (so-called "water draining speed Q1") in which the cleaning water in the water storage cylinder 262 flows out into the water storage tank 12 only from the first outflow hole 268 in the large cleaning mode. ”) (Q2>Q1).

Next, the operation of the drain valve device 200 according to the third embodiment of the present invention will be described with reference to FIGS. 5A and 5B.
First, in the standby state shown in state (I) of FIGS. 5A and 5B, the switching valve 258 is in a horizontal position, and the second outflow hole 270 of the water storage cylinder 162 is opened.
When the large cleaning mode is started from the standby state shown in state (I) of FIG. 5A, the operating shaft 54 and the valve body 36 are moved by the first chain 52 in state (II) of FIG. be pulled upwards.
At this time, the switching valve 258 is pulled upward by the second chain 56 and rotates from the horizontal position to the vertical position, and the outflow hole 268 of the water tank 262 is closed by the switching valve 258 (see FIG. 5A). (see condition (II)).
Note that the state in which the outflow hole 268 of the water storage cylinder 262 is closed by the switching valve 258 changes from the subsequent state (III) in FIG. 5A to the state in FIG. 5A in which the valve body 36 closes and the large cleaning mode ends. (VI).
However, as shown in states (II) to (VI) of FIG. 5A, even when the second outflow hole 270 of the water tank 262 is closed by the switching valve 258, the first outflow hole 268 is always open. The inside of the water storage cylinder 162 and the inside of the water storage tank 12 are always communicated.
Then, as shown in states (III) to (VI) of FIG. 5A, when the water level W1 in the water storage tank 12 outside the water storage cylinder 262 becomes lower than the water level W2 in the water storage cylinder 262, the water pressure in the water storage cylinder 262 is higher than the water pressure inside the water storage tank 12, so even if the second outflow hole 270 of the water storage cylinder 262 is closed by the switching valve 258, the pressure between the inside of the water storage cylinder 262 and the outside of the water storage tank 12 is high. The pressure difference allows the wash water in the water storage cylinder 262 to flow out from the first outflow hole 268 into the water storage tank 12 .

On the other hand, when the small cleaning mode is started from the standby state shown in state (I) of FIG. be lifted up.
On the other hand, since the switching valve 258 is not pulled upward by the second chain 56 and does not rotate from the horizontal position to the vertical position, the second outflow hole 270 of the water tank 262 is in a state where it is opened by the switching valve 258. (See state (II) in FIG. 5B).
The second outflow hole 270 of the water tank 262 is kept open at all times by the switching valve 258 from the standby state (I) in FIG. 5B to the state (VI) in which the small wash mode ends in FIG. 5B. Ru.

Next, in the state in the small washing mode shown in states (III) to (V) in FIG. Since the water level W2 in the water tank 262 is located above the lower end of the second outflow hole 270, the cleaning water in the water storage cylinder 262 flows from the first outflow hole 268 to the amount of cleaning water per unit time Q2a [L/min] ( The cleaning water flows out from the second outflow hole 270 at a rate of Q2b [L/min] (so-called "water drainage rate Q2b") per unit time.
At this time, when the water level W1 in the water storage tank 12 is lower than the second outflow hole 270, the second outflow hole 270 is opened to the atmosphere. The water drainage rate is equal to or greater than the water drainage rate Q2a in No. 268 (Q2b≧Q2a).
As shown in the state (VI) of FIG. 5B, when the small wash mode is finished, the lowest water level DWL2 in the water storage tank 12 in the small wash mode is the same as that in the large wash mode in the state (VI) of FIG. 5A. It is located above the lowest water level DWL1 in the water storage tank 12.

According to the drain valve device 200 according to the third embodiment of the present invention described above, the total opening area S2 of the first outflow hole 268 and the second outflow hole 270 of the water storage cylinder 262 in the small wash mode is the same as that in the large wash mode. It is set to be larger than the total opening area S1 of only the first outflow hole 268 of the water storage cylinder 262, and the second outflow hole 270 is arranged above the first outflow hole 268.
As a result, when the valve body 36 is opened in the large cleaning mode shown in FIG. 5A, the cleaning water in the water tank 262 flows out only from the first outflow hole 268 to the water storage tank 12, while the small water tank shown in FIG. 5B When the valve body 36 is opened in the cleaning mode, the cleaning water in the water storage cylinder 262 flows out into the water storage tank 12 from both the first outflow hole 268 and the second outflow hole 270.
In addition, in the small washing mode, the amount of second washing water per unit time Q2 [L/min] (so-called Regarding the "second water draining speed Q2"), the first wash water amount Q1 [L/min] per unit time when the wash water in the water tank 262 flows out only from the first outflow hole 268 to the water storage tank 12 in the large wash mode. (so-called "first water drainage speed Q1").
Therefore, since the descending speed v2 of the float 72 in the small cleaning mode can be made larger than the descending speed v1 of the float 72 in the large cleaning mode, the descending time of the float 72 in the small cleaning mode and the opening time of the valve body 36 can be increased. The valve time can be made shorter than the descending time of the float 72 and the opening time of the valve body 36 in the large cleaning mode.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water Q1, Q2 [L/ min] (so-called "water draining speeds Q1, Q2"), it is possible to change the descending speeds v1, v2 of the float 72 as the water level in the water tank 262 decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Moreover, the closing noise generated when the valve body 36 closes the drain port 18 can also be reduced.

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 conceptual diagram of the configuration of a drain valve device according to a fourth embodiment of the present invention, and a state in which the float is descending after opening of the valve is started in the deep cleaning mode. Moreover, FIG. 6B is a conceptual diagram of the configuration of the drain valve device according to the fourth embodiment of the present invention, and the state when the float is descending after opening of the valve is started in the small wash mode.
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 first to third embodiments of the present invention described above are as follows. The same reference numerals are used, and the description thereof will be omitted.

First, as shown in FIGS. 6A and 6B, in the drain valve device 300 according to the fourth embodiment of the present invention, the water storage cylinder 362 has a first outflow disposed below in the side wall portion 362a on one of the left and right sides thereof. A hole 368 and a second outflow hole 370 arranged above the first outflow hole 368 are provided.
Moreover, a partition part (switching valve 358) for switching between large and small washes is provided in each of the first outflow hole 368 and the second outflow hole 370 of the water storage cylinder 362 so as to be openable and closable.
This switching valve 358 can be slid in the vertical direction by moving the second chain 56 up and down according to the large and small cleaning mode.
That is, in the deep cleaning mode shown in FIG. 6A, the switching valve 358 is pulled up by the second chain 56 and slid upward, so that the first outflow hole 368 is opened by the switching valve 358, and the second outflow hole is opened. 370 is closed by a switching valve 358.
On the other hand, in the small cleaning mode shown in FIG. 6B, the switching valve 358 is not pulled up by the second chain 56, the first outflow hole 368 is closed by the switching valve 358, and the second outflow hole 370 is closed by the switching valve 358. It is now open to the public.

Furthermore, the total opening area S1 of the first outflow holes 368 opened by the switching valve 358 in the large cleaning mode is the same as the total opening area S2 of the second outflow holes 370 opened by the switching valve 358 in the small cleaning mode. (S1=S2).
In the drain valve device 300 of this embodiment, similarly to the drain valve devices 1, 100, 200 according to the first to third embodiments of the present invention described above, when the deep cleaning mode is started, the water storage cylinder 362 is opened. The water level W1 in the outer water storage tank 12 is lowered to be lower than the water level W2 in the water storage cylinder 362.
Thereafter, when the water level W1 in the water storage tank 12 falls below the upper end position of the first outflow hole 368, the cleaning water in the water storage cylinder 362 flows out from the first outflow hole 368 into the water storage tank 12. The amount of washing water Q1 [L/min] (so-called "water draining speed Q1") is accelerated.
On the other hand, when the small wash mode is started, the water level W1 in the water storage tank 12 outside the water storage cylinder 362 is lowered to be lower than the water level W2 in the water storage cylinder 362.
Thereafter, when the water level W1 in the water storage tank 12 falls below the upper end position of the second outflow hole 370, the cleaning water in the water storage cylinder 362 flows out from the second outflow hole 370 into the water storage tank 12. The amount of washing water Q2 [L/min] (so-called "water draining speed Q2") is accelerated.
As a result, in the large cleaning mode, the amount of first cleaning water Q1 [L/min] per unit time in which the cleaning water in the water storage cylinder 362 flows out from the first outflow hole 368 to the water storage tank 12 (so-called "water draining speed Q1") Compared to this, the amount of second cleaning water per unit time Q2 [L/min] (so-called "water draining speed Q2") in which the cleaning water in the water tank 362 flows out from the second outflow hole 370 to the water storage tank 12 in the small cleaning mode. ) is set to be large (Q1<Q2).

According to the drain valve device 300 according to the fourth embodiment of the present invention described above, when the valve body 36 is opened in the large cleaning mode, the cleaning water in the water storage cylinder 362 flows from the first outflow hole 368 to the water storage tank 12. It will be leaked.
On the other hand, when the valve body 36 is opened in the small wash mode, the wash water in the water storage cylinder 362 flows out from the second outflow hole 370 into the water storage tank 12.
At this time, even if the total opening areas S1 and S2 of the first outflow hole 368 and the second outflow hole 370 are the same, the second outflow hole 370 is arranged above the first outflow hole 368. Therefore, in the large washing mode, the first washing water amount Q1 [[L/min] (so-called "first water draining speed Q1 ''), the amount of second cleaning water per unit time Q2 [L/min] (so-called "second water The exit speed Q2'') can be increased.
Therefore, since the descending speed v2 of the float 72 in the small cleaning mode can be made larger than the descending speed v1 of the float 72 in the large cleaning mode, the descending time of the float 72 in the small cleaning mode and the opening time of the valve body 36 can be increased. The valve time can be made shorter than the descending time of the float 72 and the opening time of the valve body 36 in the large cleaning mode.
As a result, depending on the selected large wash mode or small wash mode, the amount of wash water Q1, Q2 [L/ min] (so-called "water draining speeds Q1, Q2"), it is possible to change the descending speeds v1, v2 of the float 72 as the water level in the water tank 362 decreases.
Therefore, the instantaneous flow rate [L/min] of cleaning water that affects cleaning performance can be maintained relatively high even in the small cleaning mode where the amount of cleaning water is smaller than in the large cleaning mode. Moreover, the closing noise generated when the valve body 36 closes the drain port 18 can also be reduced.

In addition, in the drain valve devices 1, 100, 200, and 300 according to the first to fourth embodiments of the present invention described above, the water storage cylinders 62, 162, 262, As a means for changing the descending speed v1, v2 of the float 72 as the water level in the tank 362 decreases, the cleaning water in each water tank 62, 162, 262, 362 flows through each outflow hole 68, 70, 168, 170, 268, 270. , 368, 370 to the water storage tank 12 per unit time Q1, Q2 [L/min] (so-called "water draining speed Q1, Q2"). The present invention is not limited to this example, and other forms other than changing the so-called "water removal speed" are also applicable.
For example, as another form, depending on the selected large wash mode or small wash mode, the total outflow amount [L] of the wash water in the water storage cylinder flowing out from the outflow hole to the water storage tank (so-called "water loss amount") may be changed.
Alternatively, as yet another embodiment, the buoyancy of the wash water in the water storage tank or water storage cylinder acting on the float may be changed depending on the selected large wash mode or small wash mode.

1 Drain valve device according to the first embodiment of the present invention 2 Wash water tank device 4 Flush toilet 6 Bowl portion 8 Toilet main body 8a Water conduit 10 Exterior tank 12 Water storage tank (wash water tank)
14 Lid body 16 Heat insulator 18 Drain port 20 Water supply device 22 Water supply pipe 24 Valve unit 26 Water supply float 28 Water discharge pipe 30 Lever 32 Operating device 34 Operating lever 36 Valve body 38 Lifting operation part 40 Outer rotating shaft 42 Inner rotating shaft 44 Rotation Main shaft part 46 Cylindrical rotating part 48 First swing lever 50 Second swing lever 52 First chain 54 Operating shaft 56 Second chain 58 Switching valve for switching between large and small washes (partition part)
60 Drain port forming part 62 Water storage cylinder 62a Side wall part 64 Overflow pipe 66 Valve seat 68 First outflow hole 70 Second outflow hole 72 Float 100 Drain valve device according to the second embodiment of the present invention 158 Switching valve for switching between large and small washes ( partition)
162 Water tank 162a Side wall part 168 Outflow hole 170 Communication hole 200 Drain valve device according to the third embodiment of the present invention 258 Switching valve for switching between large and small washes (partition part)
262 Water storage cylinder 262a Side wall part 268 First outflow hole 270 Second outflow hole 300 Drain valve device according to the fourth embodiment of the present invention 358 Switching valve for switching between large and small washes (partition part)
362 Water tank 362a Side wall part 368 First outflow hole 370 Second outflow hole A1 Rotation center axis A2 Rotation center axis DWL1 Minimum water level of the water storage tank in large cleaning mode DWL2 Minimum water level of the water storage tank in small cleaning mode Q1 Large cleaning mode The amount of cleaning water per unit time in which the cleaning water in the water storage cylinder when the valve body is opened flows into the water storage tank only from the first outflow hole. Q2 The amount of cleaning water in the water storage cylinder when the valve body is opened in the small cleaning mode. is the amount of cleaning water per unit time that flows out from the first outflow hole and the second outflow hole to the water storage tank. v1 Water level in the water tank and descending speed of the float in the large wash mode v2 Water level in the water tank and descending speed of the float in the small wash mode W1 Water level in the water tank W2 Water level in the water tank

Claims (3)

A drain valve device provided in a flush water tank that supplies flush water to a flush toilet,
a valve body that opens and closes a drain port provided at the bottom of the wash water tank;
an operating shaft having the valve body provided at its lower end and opening and closing the valve body by moving up and down;
A water storage cylinder through which the operating shaft is inserted in the vertical direction and a part of the washing water in the washing water tank is stored, the water storage cylinder having an outflow hole through which the washing water inside the tank flows out to the outside. ,
a float disposed in the water storage cylinder, which causes buoyancy obtained by washing water in the water storage cylinder to act on the actuation shaft;
The operating shaft and the valve body are configured such that when the float descends as the water level in the water storage cylinder decreases, the valve body moves downward in conjunction with the float, and the valve body closes the drain port;
A large flush mode or the first flush in which the flush water in the flush water tank is supplied from the drain port to the flush toilet at a first flush water amount from when the valve body opens to when the valve closes. Any of the washing modes of the small washing mode in which the second washing water amount is supplied with a smaller amount of water than the second washing water amount can be selectively executed;
The water tank or the float is configured to change the descending speed of the float as the water level in the water tank falls, depending on the selected large wash mode or small wash mode,
The outflow hole of the water storage cylinder includes a first outflow hole arranged on a side wall of the water storage cylinder so as to allow the washing water in the water storage cylinder to flow out into the washing water tank in the large washing mode, and a first outflow hole arranged in the side wall of the water storage cylinder and the small washing a second outflow hole disposed on the side wall so as to allow the wash water in the water storage cylinder to flow out into the wash water tank in the mode;
When the valve body is opened, the total opening area of each of the first outflow hole and the second outflow hole is the same, and the second outflow hole is located above the first outflow hole. The cleaning water in the water storage tank is configured such that in the large cleaning mode, the cleaning water flows out only from the first outflow hole to the cleaning water tank, while in the small cleaning water mode, the cleaning water flows through the second outflow hole. The water flows only from the hole into the washing water tank.
Compared to the amount of first washing water per unit time in which the washing water in the water storage cylinder flows out from the first outflow hole to the washing water tank in the large washing mode, the washing water in the water storage cylinder in the small washing mode is set so that the amount of second wash water flowing out from the second outflow hole into the wash water tank per unit time is increased. A wash water tank device comprising the drain valve device according to claim 1. A flush toilet comprising the flush water tank device according to claim 2.

Images