JP5811342B2 - Drain valve device, wash water tank device equipped with this drain valve device, and flush toilet equipped with this wash water tank device - Google Patents

Description

  The present invention relates to a drain valve device, a washing water tank device provided with the drain valve device, and a flush toilet equipped with the washing water tank device, and more particularly, a washing water tank for storing washing water for washing the toilet bowl. The present invention relates to a drain valve device, a flush water tank device including the drain valve device, and a flush toilet including the flush water tank device.

Conventionally, as a drain valve device of a wash water tank for storing wash water for washing toilet bowls, for example, as described in Patent Document 1, a water storage part formed with a small hole through which wash water flows out at a small flow rate; There is known a drain valve device including a float that descends as the water level in the water storage section decreases.
In such a drain valve device, the horizontal shaft member connected to the float is engaged with the protrusion of the drain valve device main body, so that the drain valve is kept open, while the float is lowered and connected to the float. When the engagement between the horizontal shaft member and the projection of the drain valve device main body is released, the drain valve closing operation is started.

European Patent No. 1650366

In such a conventional drain valve device described in Patent Document 1, the rate at which the water level in the water storage section descends is set to a very slow speed before the drain valve in the open state starts the valve closing operation. Therefore, a sufficient amount of washing water can be supplied from the washing water tank to the toilet.
However, the lower the water level in the reservoir, the slower the float. In particular, when the opening area of the small hole in the reservoir is set to be extremely small, the water level in the reservoir gradually passes through the balance position between the float's own weight and buoyancy as the washing water flows out from the small hole at a smaller flow rate. Therefore, the float is not easily lowered even in the balance position between its own weight and buoyancy, and the engagement between the horizontal shaft member connected to the float and the protrusion of the drain valve device main body is easily caused by friction or the like. There is a problem that it becomes difficult to come off.
In addition, when the engagement between the horizontal shaft member connected to the float and the protrusion of the drain valve device main body is difficult to be disengaged, the disengagement timing is likely to vary, and the water is discharged from the flush water tank to the toilet. There is a problem that the amount of washing water and the dead water level (dead water line (DWL)) in the washing water tank at the end of drainage also vary.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and provides a drain valve device that can prevent variations in the amount of flush water supplied from the drain of the flush water tank to the toilet. The purpose is to do.

In order to achieve the above object, the present invention is a drain valve device for a wash water tank for storing wash water for washing a toilet, and a valve body that opens and closes a drain port disposed on the bottom surface of the wash water tank, A control cylinder that controls the movement of the valve body, and includes a water storage section that forms a water storage area for storing cleaning water, and the cleaning water stored in the water storage section flows out into the cleaning water tank at a predetermined flow rate. The control cylinder in which the opening to be formed is formed, and the control cylinder is attached so as to be engageable with the valve body, and is lowered when the engagement with the valve body is released due to a decrease in the water level in the water storage portion of the control cylinder. After the float provided in the water storage part of the control cylinder and the valve body open the drain, the water level in the water storage part of the control cylinder descends and passes the balance position between the weight of the float and the buoyancy The float is in the water reservoir of the control cylinder. A predetermined height above the balance position in the water storage region in the water storage section so that the engagement between the float and the valve body is released and the valve body is closed. And a storage area reduction means for rapidly decreasing the storage area below the position.
In the present invention configured as described above, in the water storage area in the water storage section of the control cylinder, a predetermined height position above the float balance position (balance position between the float's own weight and buoyancy) by the water storage area reduction means. Since the water storage area below the abruptly decreases, the water level in the water storage part of the control cylinder is lowered when the water level in the control cylinder water storage part drops and passes the float balance position after the valve body opens the drainage port. The descent speed can be increased. As a result, when the water level in the water storage section of the control cylinder passes the float balance position, the engagement between the float and the valve body can be smoothly released, and the lowering of the float can be started smoothly. It can be closed smoothly. As a result, it is possible to prevent variation in the amount of cleaning water discharged from the drain port of the cleaning water tank.

In the present invention, preferably, the water storage area reducing means is a step portion formed so as to raise a part of a bottom portion in the water storage portion of the control cylinder, and an upper surface of the step portion is raised to the bottom of the water storage portion. A surface is formed and is located above the balance position.
In the present invention configured as described above, the valve body is formed by using the step portion formed so as to raise a part of the bottom portion in the water storage portion of the control cylinder as the water storage area reducing means of the water storage portion of the control cylinder. After opening the drain, the water level in the water storage part of the control cylinder descends, and the upper surface of the step part of the water storage part located above the balance position of the float in the water storage part (the balance position of the float's own weight and buoyancy) ( When passing through the bottom-up surface), the water storage area in the water storage section of the control cylinder is rapidly reduced, so that the descent speed of the water level in the water storage section can be increased. As a result, since the water level in the water storage part further descends and the water level descending speed when passing through the float balance position can be accelerated, the engagement between the float and the valve body is smoothly released to lower the float. It can start smoothly and can close a valve body smoothly. As a result, it is possible to prevent variation in the amount of cleaning water discharged from the drain port of the cleaning water tank.

In the present invention, preferably, the opening formed in the water storage part of the control cylinder is formed to extend in a slit shape in a substantially horizontal direction at a position below the water storage part, and further, a part of the opening of the control cylinder And a shielding member that is attached to the outside of the opening of the control cylinder. The shielding member changes the mounting position of the control cylinder by changing the attachment position to the control cylinder. By adjusting the communication area between the opening and the communication port, it is possible to adjust the amount of cleaning water flowing out from the water storage portion of the control cylinder into the cleaning water tank.
In the present invention configured as described above, the opening formed in the water storage part of the control cylinder is formed so as to extend in a slit shape in a substantially horizontal direction at a position below the water storage part. When adjusting and adjusting the communication area between the control cylinder opening and the shielding member communication port, the effect of variation in water pressure in the vertical direction when passing from the control cylinder opening to the shielding member communication port is controlled and controlled. Variations in the amount of washing water flowing out from the opening of the cylinder can be suppressed. As a result, it is possible to prevent variation in the total amount of cleaning water discharged from the drain of the cleaning water tank.

Next, the present invention is a washing water tank device comprising the drain valve device.
In this invention comprised in this way, the washing water tank apparatus which can prevent the dispersion | variation in the amount of washing water which wash | cleans a toilet bowl can be provided.

Next, the present invention is a flush toilet comprising the flush water tank apparatus.
In this invention comprised in this way, the flush toilet which can prevent the dispersion | variation in the amount of washing water which wash | cleans a toilet bowl can be provided.

  According to the drain valve device of the present invention, it is possible to prevent variations in the amount of washing water supplied to the toilet from the drain port of the washing water tank.

1 is a perspective view showing a state where a toilet seat, a toilet lid, and a lid of a flush water tank device are removed in a flush toilet to which a flush water tank device including a drain valve device according to an embodiment of the present invention is applied. It is the perspective view which looked at the internal structure of the washing water tank apparatus provided with the drain valve device by one embodiment of the present invention from the diagonally forward upper part. It is a disassembled front view which shows the drain valve apparatus by one Embodiment of this invention. It is a left view which shows the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the state before the waste_water | drain start in the small washing mode and large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the state at the time of valve opening in the small washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the state at the time of valve opening in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line of FIG. 4, and shows the state in the middle of the waste_water | drain in the small washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the state at the time of the completion | finish of drainage in the small washing mode of the drain valve apparatus by one Embodiment of this invention. It is a perspective view which shows the control cylinder of the drain valve apparatus by one Embodiment of this invention. It is a left view which shows the control cylinder of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the XII-XII line | wire of FIG. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the 1st state in the middle of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the XIV-XIV line | wire of FIG. 4, and shows the 1st state in the middle of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the 2nd state in the middle of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the XIV-XIV line | wire of FIG. 4, and shows the 2nd state in the middle of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the 3rd state in the middle of the waste_water | drain in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the XIV-XIV line | wire of FIG. 4, and shows the 3rd state in the middle of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the VV line | wire of FIG. 4, and shows the state at the time of completion | finish of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention. It is sectional drawing seen along the XIV-XIV line | wire of FIG. 4, and shows the state at the time of completion | finish of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention.

Next, a drain valve device according to an embodiment of the present invention, a flush water tank device equipped with the drain valve device, and a flush toilet equipped with the flush water tank device will be described with reference to the accompanying drawings.
First, referring to FIG. 1, a flush toilet to which a flush water tank apparatus equipped with a drain valve apparatus according to an embodiment of the present invention is applied will be described.
FIG. 1 is a perspective view showing a state where a toilet seat, a toilet lid, and a lid of a flush water tank apparatus are removed in a flush toilet to which a flush water tank apparatus including a drain valve device according to an embodiment of the present invention is applied. It is.

As shown in FIG. 1, reference numeral 1 is a so-called siphon type flush toilet that sucks filth in the bowl portion using a siphon action and discharges it from the drain trap pipe to the outside at once. This flush toilet 1 includes a toilet bowl body 2 made of earthenware. A bowl section 4 and a trap pipe 6 communicating with a lower portion of the bowl section 4 are formed in the toilet bowl body 2.
To the upper edge of the bowl portion 4 of the toilet body 2, flush water supplied from a rim 8 overhanging on the inside and a water conduit (not shown) formed in the rear side of the toilet body 2 is spouted. The first water outlet 10 is formed, and the wash water discharged from the first water outlet 10 descends while swirling to wash the bowl portion 4.

Below the bowl portion 4 is formed a water storage portion 12 whose water storage surface is indicated by a chain line W0. An inlet 6a of a drain trap pipe 6 is opened below the water reservoir 12, and a drain trap pipe 6 behind the inlet 6a is connected to a drain pipe (not shown) through a drain socket (not shown). (Not shown).
Further, a second water discharge port 14 for discharging wash water supplied from a water conduit (not shown) formed in the rear side of the toilet body 2 is formed above the water storage surface W0 of the bowl portion 4. The wash water discharged from the second water discharge port 14 generates a swirling flow that swirls the water stored in the water storage unit 12 in the vertical direction.

A flush water tank device 16 for storing flush water supplied to the toilet bowl 2 is provided on the upper surface on the rear side of the toilet bowl 2.
In addition, although this embodiment demonstrates the example which applied the washing water tank apparatus 16 to the siphon type flush toilet mentioned above, it is not limited to such a siphon type flush toilet, The head of the water in a bowl part The present invention is also applicable to other types of flush toilets such as a so-called flush toilet that flushes filth by flowing water.

Next, the internal structure of the cleaning water tank device 16 will be described with reference to FIG.
FIG. 2 is a perspective view of the internal structure of the washing water tank apparatus provided with the drain valve device according to the embodiment of the present invention, as viewed obliquely from the upper front.
As shown in FIG. 2, the flush water tank device 16 includes a reservoir tank 18 for storing flush water for washing the flush toilet 1, and a water conduit (not shown) of the toilet body 2 is provided at the bottom of the reservoir tank 18. A drain outlet 20 communicating with the water tank 18 is formed, and the wash water in the water storage tank 18 is supplied to a water conduit (not shown) of the toilet body 2. Further, the amount of washing water stored in the water storage tank 18 differs depending on the type of toilet bowl.

  As shown in FIG. 2, in the water storage tank 18 of the cleaning water tank device 16, a water supply device 22 that supplies cleaning water into the water storage tank 18 and a drain outlet 20 for the cleaning water stored in the water storage tank 18 are provided. A drain valve device 24 (details will be described later) is provided that opens and flows out to a water conduit (not shown) of the toilet body 2.

  The water supply device 22 is connected to an external water supply source (not shown) and extends upward from the bottom of the water storage tank 18. The water supply device 22 is attached to the upper end of the water supply pipe 26 and is supplied with water from the water supply pipe 26. A water supply valve 28 that switches between water discharge and water stoppage into the water storage tank 18 and a float 30 that moves up and down according to fluctuations in the water level in the water storage tank 18 and switches water discharge and water stoppage by the water supply valve 28 are provided. Yes.

A water discharge port 32 is opened at the lower end on the outer peripheral side of the water supply pipe 26, and the wash water from the water supply valve 28 is discharged into the water storage tank 18 from the water discharge port 32.
The water supply device 22 further includes a refill pipe 34 connected to the water supply valve 28, and the downstream end portion of the refill pipe 34 is positioned near the upper end opening of the overflow pipe 36 of the drain valve device 24 described later. In addition, a part of the refill pipe 34 is fixed to a predetermined location in the overflow pipe 36 or the water storage tank 18.

In the water supply device 22, when the wash water in the water storage tank 18 is drained to the toilet by the drain valve device 24 described later, the water level of the wash water is lowered and the float 30 is lowered, thereby opening the water supply valve 28. Water discharge from the water discharge port 32 is started, and water discharge from the water supply source (not shown) outside the washing water tank device 16 into the water storage tank 18 is started.
Further, when water discharge continues and the water level in the water storage tank 18 rises, the float 30 rises, thereby closing the water supply valve 28 and stopping water discharge from the water discharge port 32. Thereby, the water level of the washing water in the water storage tank 18 is maintained at a predetermined water level when the water is full.

Next, details of the drain valve device 24 according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is an exploded front view showing a drain valve device according to an embodiment of the present invention, and FIG. 4 is a left side view showing the drain valve device according to an embodiment of the present invention. Next, FIG. 5 is a cross-sectional view taken along line VV in FIG. 4, and shows a state before the start of drainage in the small washing mode and the large washing mode of the drain valve device according to one embodiment of the present invention. . 6 and 7 are cross-sectional views taken along the line VV in FIG. 4, and the drain valve device according to one embodiment of the present invention is in a state when the valve is opened in the small washing mode and the large washing mode. Respectively. 8 and 9 are cross-sectional views taken along the line VV in FIG. 4, and the state during the drainage and the end of the drainage in the small washing mode of the drain valve device according to the embodiment of the present invention. Each state is shown. Here, in FIGS. 6 to 8, the flow of the cleaning water is schematically indicated by arrows.

  3 and 4, the drain valve device 24 is attached to the bottom surface of the water storage tank 18 and has a drain port unit 38 that forms a drain port 20 that communicates with a water conduit (not shown) of the toilet body 2. The drain valve unit 40 attached to the upper end of the drain port unit 38 is provided.

The drain port unit 38 of the drain valve device 24 includes a drain port forming member 42 that is attached to a predetermined position on the bottom surface 18 a of the water storage tank 18 and forms the drain port 20.
The lower end portion of the drain port forming member 42 penetrates the bottom surface 18 a of the water storage tank 18 and is fastened by a fastening member 46 through a seal member 44, and the drain port forming member 42 is fixed to the bottom surface 18 a of the water tank 18. .

  An overflow pipe mounting portion 48 to which the overflow pipe 36 is attached is provided on a part of the outer periphery of the drain port forming member 42, and the overflow pipe 36 is disposed inside the drain port forming member 42 via the overflow pipe mounting portion 48. It communicates with the drain port 20.

Furthermore, the drain port forming member 42 includes a valve seat 50 that is formed over the entire periphery along the upper edge of the drain port 20 and protrudes upward. The valve seat 50 and the valve body 52 of the drain valve unit 40 are provided with each other. By contact, the drainage port 20 is closed.
Further, the drain port forming member 42 includes a plurality of column portions 56 extending in the vertical direction from a position spaced apart from the valve seat 50 toward the outside to the upper end portion 54 of the drain port forming member 42. 56 are arranged at predetermined intervals along the circumferential direction, and a plurality of communication ports 58 for allowing the cleaning water outside the drain valve device 24 to flow into the drain port 20 between the adjacent column portions 56. Is forming.

  Next, as shown in FIGS. 3 to 5, the drain valve unit 40 of the drain valve device 24 includes a valve body 52, a valve body holding member 60 that holds the valve body 52, and the valve body holding member 60. A resin main shaft member 62 having a lower end attached and extending in the vertical direction, and an inner control cylinder member 64 attached to the upper end portion 54 of the drain port forming member 42 of the drain port unit 38 and controlling the movement of the valve body 52, A shielding member 66 attached to the outside of the side peripheral wall 64b of the inner control cylinder member 64 in which the flow rate adjusting opening 64a is formed, and a resin-made large washing float member 68 for starting the valve closing operation in the large washing mode. A resin-made small washing float member 70 and a resin-made cam member 72 for starting the valve closing operation in the small washing mode, a resin-made support member 74 for supporting these members 70, 72, and An outer control cylinder member 76 that surrounds the members 60 to 74 from the outside, an operation wire 78 that is attached to the upper end portion 62a of the main shaft member 62 and operates the valve opening operation of the valve body 52 by pulling up the main shaft member 62, and outer control And a guide member 80 that holds the cylindrical member 76 from above and guides the vertical movement of the operation wire 78.

The valve body 52 is made of a seal member such as a seat packing, and as shown in FIGS. 3 and 5, the upper holding portion 60a and the lower holding portion 60b of the valve body holding member 60 attached to the lower end portion of the main shaft member 62. It is inserted and fixed between.
The main shaft member 62 is inserted into a guide hole 64c formed at substantially the center of the inner control cylinder member 64 and is slidably mounted in the axial direction (vertical direction). The valve body 52 is attached to the main shaft member 62. At the same time, it moves up and down and functions as a drain valve that opens and closes the drain port 20.

  Next, as shown in FIGS. 2, 3, and 5 to 7, one end of the operation wire 78 that has passed through the guide hole 80 a of the guide member 80 is attached to the upper end 62 a of the main shaft member 62. The end is attached to a wire take-up device 82 attached to the inside of the water storage tank 18. The wire winding device 82 is connected to an operation lever 84 attached to the outside of the water storage tank 18, and the operation lever 84 is rotated in a direction to execute a predetermined cleaning mode of large cleaning or small cleaning. As a result, the wire winding device 82 is operated in conjunction with the rotation of the operation lever 84, the operation wire 78 is taken up by the wire winding device 82, and the drain valve unit 40 is taken up by the taken up operation wire 78. The main shaft member 62 is pulled up, and the valve body holding member 60 and the valve body 52 are raised together with the main shaft member 62.

For example, when the operation lever 84 is rotated in a predetermined direction (a direction in which the small cleaning mode is executed), the wire winding device 82 is activated, and the operation wire 78 is smaller than the maximum winding amount in the large cleaning mode. The main shaft member 62 and the valve body holding member 60 of the drain valve unit 40 are pulled up to a predetermined height position lower than the maximum height position. At this time, the height (stroke) H of the valve body 52 with respect to the valve seat 50 becomes H1, and the drainage in the small washing mode to the toilet body 2 of the flush toilet 1 by the drain valve device 24 of the flush water tank device 16 is started. (See FIG. 6).
On the other hand, when the operation lever 84 is rotated in the direction opposite to the predetermined direction (the direction in which the large cleaning mode is executed), the wire winding device 82 is activated, and the operation wire 78 has a predetermined maximum winding amount. The main shaft member 62 and the valve body holding member 60 of the drain valve unit 40 are wound up to their respective maximum height positions. At this time, the rising height (stroke) H of the valve body 52 with respect to the valve seat 50 becomes the maximum height (maximum stroke) H2 (H2> H1), and the flush toilet 1 by the drain valve device 24 of the flush water tank device 16 is used. Drainage of the large washing mode to the toilet body 2 is started (see FIG. 7).

  In this embodiment, as an example, the operation lever 84 will be described with reference to a manual operation mode in which the user directly operates the operation lever 84 to operate the wire winding device 82. However, the driving means such as a motor for rotating the operation lever 84 is provided, and the driving means is driven by a command signal from an externally set operation button (not shown) or a human sensor (not shown). The operation mode may be such that the operation of the system is automatically controlled.

Next, as shown in FIGS. 3 and 5 to 9, a small cleaning float member 70 is attached to an intermediate portion in the axial direction of the support member 74, and the small cleaning float member is attached to the support member 74. The attachment position 70 can be changed in the axial direction (vertical direction).
Further, the lower end portion of the support member 74 is inserted into a support member mounting hole 64d penetrating in the vertical direction of the inner control cylinder member 64, which will be described in detail later, and the upper end portion of the support member 74 is attached to the support member for the guide member 80. The support member 74 is inserted into the hole 80b and is held in the support member mounting holes 64d and 80b so as to be slidable in the vertical direction.

  The cam member 72 is a hinge portion 72a rotatably attached to the hinge coupling portion 74a of the support member 74, and an engagement formed so as to protrude outward from the upper end portion 62a of the main shaft member 62 to a predetermined position. An engaging recess 72b that can engage with the protrusion 62b is provided.

  The large washing float member 68 includes a float main body portion 68a housed in a water storage portion 86 of the inner control cylinder member 64, which will be described in detail later, and a pair of arm portions extending horizontally from the upper ends on both sides of the float main body portion 68a. 68b and a pair of hinge projections formed so as to protrude outward from the respective distal ends of these arm portions 68b and rotatably attached to a pair of hinge coupling holes 64e at the upper end of the inner control cylinder member 64 68c and an engagement protrusion 62c that is formed at a distal end portion extending a predetermined length downward from the respective distal end portions of the arm portion 68b and protrudes outward from the engagement protrusion 62b of the main shaft member 62 to a predetermined position in the axially lower direction. The engaging recess 68d is engageable.

  As shown in FIGS. 3 to 9, a plurality of slit holes 76 b extending in the vertical direction are formed in the side peripheral surface 76 a of the outer control cylinder member 76. The cleaning water in the water storage tank 18 stored above the lower end of the slit hole 76b of the outer control cylinder member 76 and outside the outer control cylinder member 76 passes through the slit hole 76b and flows into the outer control cylinder member 76. It can flow into the interior.

Further, as shown in FIG. 5, when the drain valve device 24 is in the small washing mode and the large washing mode before the drainage is started, the valve body 52 comes into contact with the valve seat 50, the drain port 20 is closed, and the water storage tank 18. The water level inside becomes the still water level Wf when the water is full, and the wash water in the water storage tank 18 stored outside the outer control cylinder member 76 flows into the outer control cylinder member 76 through the slit hole 76b. The cleaning float member 68 and the small cleaning float member 70 are submerged.
Further, the engaging recess 72b of the cam member 72 is located above the engaging protrusion 62b of the main shaft member 62, and the both 72b and 62b are not engaged with each other. The mating recess 68d is also positioned above the engagement protrusion 62c of the main shaft member 62, and the two 68d and 62c are not engaged.

Next, as shown in FIG. 6, in the state when the drain valve device 24 is opened in the small washing mode, the valve body 52 rises with respect to the valve seat 50 at the stroke H1 and the drain port 20 is opened. The cleaning water in the water storage tank 18 stored on the outside of the outer control cylinder member 76 and the cleaning water in the outer control cylinder member 76 communicate with the slit hole 76b of the outer control cylinder member 76 and the drain port forming member 42. Since the communication is made through the port 58, the water level in the water storage tank 18 and the water level in the outer control cylinder member 76 both become the water level W1 lower than the water stop water level Wf when full, and the large washing float member 68 and the small washing. The float member 70 is in a state where it is submerged.
Further, the support member 74 is raised by the buoyancy of the small cleaning float member 70.
Further, since the main shaft member 62 and its engaging projection 62b as well as the valve body 52 are raised at the stroke H1, the engaging recess 72b of the cam member 72 is engaged with the engaging projection 62b of the main shaft member 62. Thus, the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is constrained. On the other hand, the engaging recess 68d of the large cleaning float member 68 is positioned above the engaging protrusion 62c of the main shaft member 62, and the two 68d and 62c are not engaged.

On the other hand, as shown in FIG. 7, when the drain valve device 24 is opened in the large washing mode, the valve body 52 rises with respect to the valve seat 50 with the maximum stroke H2 and the drain port 20 is opened. The water level in the water storage tank 18 becomes a water level W2 lower than the water stop water level Wf when the water is full, and the cleaning water in the water storage tank 18 stored outside the outer control cylinder member 76 and the inside of the outer control cylinder member 76 are stored. Since the cleaning water communicates with the slit hole 76b of the outer control cylinder member 76 and the communication port 58 of the drain port forming member 42, the large cleaning float member 68 is submerged, but the small cleaning float member 70 and Each upper portion of the cam member 72 is exposed above the water level W2.
Further, since the main shaft member 62 and its engaging projection 62b as well as the valve body 52 are also raised at the maximum stroke H2, the engaging recess 72b of the cam member 72 is positioned below the engaging projection 62b of the main shaft member 62, Both 72b and 62b are not engaged. However, the engagement recess 68d of the large washing float member 68 is engaged with the engagement protrusion 62c of the main shaft member 62, and the main shaft member 62 and the valve body 52 are lowered (valve closing operation). Is in a restrained state.

Next, as shown in FIG. 8, in the middle of drainage in the small washing mode of the drain valve device 24, the water level in the water storage tank 18 and the outer control cylinder member are accompanied by drainage from the drain port 20 to the toilet body 2. Since the water level inside 76 is lowered to a water level W3 lower than the water level W1 shown in FIG. 6, the buoyancy of the small washing float member 70 is reduced in conjunction with the lowering of the water level, and the small washing float member 70 and The support member 74 is lowered.
Further, when the support member 74 is lowered, the cam member 72 is interlocked with this and moves in a direction (upward in FIG. 8) in which the engagement recess 72b and the engagement protrusion 62b of the main shaft member 62 are disengaged. The hinge 72a is pivoted about the center. Further, when the engagement between the engagement recess 72b of the cam member 72 and the engagement protrusion 62b of the main shaft member 62 is released, the main shaft member 62 and the valve body 52 are lowered as the water level decreases, and the drain valve device 24 is small. The valve closing operation in the cleaning mode is started.
The engaging recess 68d of the large cleaning float member 68 is located above the engaging protrusion 62c of the main shaft member 62, and the main shaft 68d and 62c are not engaged with each other. The valve closing operation caused by the lowering of the member 62 and the valve body 52 is not hindered.

  Next, when the main shaft member 62 and the valve body 52 are further lowered as the water level is lowered in FIG. 8, the valve body 52 comes into contact with the valve seat 50 and the drain port 20 is closed as shown in FIG. The drainage in 24 small cleaning modes is completed. Further, in the state at the end of drainage, the water level in the water storage tank 18 and the water level in the outer control cylinder member 76 are lowered to the water level W4 lower than the water level W3 shown in FIG. 8, and become the dead water level (DWL). It has become.

Next, the details of the inner control cylinder member 64 will be described with reference to FIGS.
10 is a perspective view showing a control cylinder of a drain valve device according to an embodiment of the present invention, FIG. 11 is a left side view showing a control cylinder of a drain valve device according to an embodiment of the present invention, and FIG. It is sectional drawing seen along the XII-XII line | wire of FIG.
First, FIG. 13 is a cross-sectional view taken along line V-V in FIG. 4 and shows a first state during drainage in the large cleaning mode of the drain valve device according to one embodiment of the present invention. These are sectional drawings seen along the XIV-XIV line of FIG. 4, and show the 1st state in the middle of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention.
Next, FIG. 15 is a cross-sectional view taken along line VV in FIG. 4, showing a second state during drainage in the large washing mode of the drain valve device according to one embodiment of the present invention. 16 is a cross-sectional view taken along line XIV-XIV in FIG. 4 and shows a second state during drainage in the large cleaning mode of the drain valve device according to the embodiment of the present invention.
17 is a cross-sectional view taken along line VV in FIG. 4 and shows a third state during drainage in the large cleaning mode of the drain valve device according to one embodiment of the present invention. These are sectional drawings seen along the XIV-XIV line of Drawing 4, and show the 3rd state in the middle of drainage in the large washing mode of the drain valve device by one embodiment of the present invention.
Further, FIG. 19 is a cross-sectional view taken along the line VV in FIG. 4 and shows a state at the end of drainage in the large washing mode of the drain valve device according to one embodiment of the present invention. It is sectional drawing seen along the XIV-XIV line | wire of FIG. 4, and shows the state at the time of completion | finish of drainage in the large washing mode of the drain valve apparatus by one Embodiment of this invention.
Here, in FIGS. 13 to 20, the flow of the cleaning water is schematically indicated by arrows.

  First, as shown in FIGS. 10 and 12, the water storage portion 86 of the inner control cylinder member 64 serves as a means for rapidly reducing the water storage area (hereinafter referred to as “water storage area reduction means”). The step portion 90 is formed so as to raise a part of the bottom surface 88. The step portion 90 includes an inner wall surface 90a formed so as to extend upward from the bottom surface 88 in the water storage portion 86. An upper surface formed so as to extend substantially horizontally from the upper end of the inner wall surface 90a of the 90 forms a bottom-up surface 90b.

  Next, a water storage region A that is formed in the water storage portion 86 of the inner control cylinder member 64 and stores the wash water includes an inner wall surface 92 that extends upward from the bottom raised surface 90b and parallel to the inner wall surface 90, and a bottom raised surface. A central inner wall surface 94 formed on the central side of the water storage section 86 in 90b, an outer inner wall surface 96 formed so as to face the central inner wall surface 94, and two adjacent central inner wall surfaces 94 The inner inner wall surface 98 formed so as to be connected and the inner peripheral wall surface 100 of the side peripheral wall portion 64b formed in a partially cylindrical shape of the inner control cylinder member 64 so as to connect the outer inner wall surfaces 96 to each other. ing.

  That is, as shown in FIGS. 10, 12, 14, 16, 18, and 20, the water storage region A in which the wash water is stored in the water storage portion 86 is raised to the bottom of the stepped portion 90 in the water storage portion 86. The same plane as the surface 90b is defined as the boundary surface P1, the water storage region of the water storage portion 86 formed above the boundary surface P1 is defined as the upper water storage region A1, and the water storage portion 86 formed below the boundary surface P1. When the water storage area is the lower water storage area A2, the cross-sectional area S1 seen in plan view in the upper water storage area A1 is larger than the cross-sectional area S2 seen in plan view in the lower water storage area A2, and the water storage section 86 The amount of water stored in the water storage section 86 is drastically reduced before and after the cleaning water level w decreases and passes through the boundary surface P1.

Also, as shown in FIGS. 12, 14, 16, 18 and 20, the bottom raised surface 90b in the water storage portion 86 of the inner control cylinder member 64 is the weight of the large washing float member 68 in the water storage portion 86. Float for large washing by the wash water stored in the water reservoir 86, located above the water level wn in the water reservoir 86 corresponding to the balance position of the downward force due to G and the upward force due to buoyancy F When the upward buoyancy F of the member 68 exceeds the downward weight of the large washing float member 68, the large washing float member 68 rises in the water storage portion 86 of the inner control cylinder member 64, and the large washing float. When the upward buoyancy F of the member 68 falls below the downward weight of the large cleaning float member 68, the large cleaning float member 68 is lowered in the water storage portion 86 of the inner control cylinder member 64. .
More specifically, the inner control cylinder member 64 moves up and down the large cleaning float member 68 according to the water level w in the water reservoir 86, that is, the large cleaning cylinder 64e of the inner control cylinder member 64 The rotation around the hinge protrusion 68c (see FIG. 3) of the float member 68 can be controlled.

In addition, at a predetermined position below the side peripheral wall portion 64 b of the inner control cylinder member 64 shown in FIGS. 10 to 20, cleaning water in the water storage portion 86 of the inner control cylinder member 64 is stored outside the inner control cylinder member 64. An opening 64a for adjusting the flow rate flowing out into the tank 18 is formed to extend in a slit shape along the circumferential direction of the side peripheral wall 64b of the inner control cylinder member 64. As shown in FIG. 11, the flow rate adjusting opening 64 a of the inner control cylinder member 64 changes stepwise in a rectangular opening area along the circumferential direction of the side peripheral wall portion 64 b of the inner control cylinder member 64. Is formed.
In the present embodiment, the opening shape of the flow rate adjustment opening 64a of the inner control cylinder member 64 changes rectangularly along the circumferential direction, and the opening area of the flow rate adjustment opening 64a changes stepwise. Although such a form is demonstrated, it is not limited to such a form, The form which changes continuously the opening area of the opening 64a for flow volume adjustment along the circumferential direction may be sufficient.

Further, as shown in FIGS. 10 and 11, the projection member 64f formed on the side peripheral wall portion 64b of the inner control cylinder member 64 is fitted on the inner peripheral surface of the partially annular wall portion 66a of the shielding member 66. A plurality of fitting recesses 66a (see FIG. 10) that can be combined are formed.
Further, the wall 66 a of the shielding member 66 has a communication port that can communicate with the flow rate adjustment opening 64 a of the inner control cylinder member 64 in a state where the shielding member 66 is attached to the side peripheral wall 64 b of the inner control cylinder member 64. 66c is formed. The circumferential length d1 of the communication port 66c is shorter than the circumferential length d2 of the flow rate adjusting opening 64a of the inner control cylinder member 64, and the vertical length d3 of the communication port 66c is The length 644 is substantially equal to the vertical maximum length d4 of the flow rate adjusting opening 64a.

Furthermore, when the shielding member 66 is attached to the side peripheral wall portion 64b of the inner control cylinder member 64, the attachment position of the shielding member 66 with respect to the side peripheral wall portion 64b of the inner control cylinder member 64 is as shown in FIGS. By shifting in the direction L or the circumferential direction R, the fitting recess 66b of the shielding member 66 to be fitted with the protrusion 64f of the inner control cylinder member 64 can be changed, and the flow rate adjustment opening 64a of the inner control cylinder member 64 can be changed. The communication area S3 (see FIG. 11), which is the cross-sectional area of the flow path that communicates with the communication port 66c of the shielding member 66, can be changed.
For example, the flow rate adjustment opening 64a of the inner control cylinder member 64 and the communication port 66c of the shield member 66 communicate with each other as the mounting position of the shielding member 66 with respect to the side peripheral wall portion 64b of the inner control cylinder member 64 is shifted in the circumferential direction L. The communication area S3 to be increased and the attachment position of the shielding member 66 with respect to the side peripheral wall portion 64b of the inner control cylinder member 64 is shifted in the circumferential direction R, so that the flow rate adjustment opening 64a of the inner control cylinder member 64 and the shielding member 66 are increased. A communication area S3 that communicates with the communication port 66c is reduced.
Further, when adjusting the communication area S3 between the flow rate adjusting opening 64a of the inner control cylinder member 64 and the communication port 66c of the shielding member 66, the communication port 66c of the shielding member 66 is used for adjusting the flow rate of the inner control cylinder member 64. By shifting in the horizontal direction with respect to the opening 64a of the inner control cylinder member 64, the influence of variation in water pressure in the vertical direction when passing through the communication port 66c of the shielding member 66 from the opening 64a for adjusting the flow rate of the inner control cylinder member 64 is suppressed. Variations in the amount of washing water that flows out from the flow rate adjustment opening 64a of the control cylinder member 64 can be suppressed.

  Further, an opening 76c is partially formed along the circumferential direction below the side peripheral surface 76a of the outer control cylinder member 76, and the outer control cylinder member 76 is attached to the inner control cylinder member 64 in the outer side. The communication port 66c of the shielding member 66 and the inside of the water storage tank 18 can communicate with each other through the opening 76c of the control cylinder member 76, and the attachment position of the shielding member 66 with respect to the side peripheral wall portion 64b of the inner control cylinder member 64 is adjusted. In the state where the communication area S3 between the opening 64a of the inner control cylinder member 64 and the communication port 66c of the shielding member 66 is adjusted, the cleaning water in the water reservoir 86 of the inner control cylinder member 64 is communicated from the opening 64a to the shielding member 66. The water can be discharged into the water storage tank 18 through the opening 66c and the opening 76c of the outer control cylinder member 76.

Next, as shown in FIGS. 13 and 14, in the first state in the middle of draining in the large washing mode of the drain valve device 24, the water in the water storage tank 18 is drained from the drain port 20 to the toilet body 2. Since the water level and the water level inside the outer control cylinder member 76 are lowered to a water level W5 lower than the water level W2 shown in FIG. 7, the buoyancy of the small washing float member 70 is reduced in conjunction with the lowering of the water level. The cleaning float member 70 and the support member 74 are lowered. When the support member 74 is lowered, the cam member 72 is interlocked with the engagement member 72b to release the engagement between the engagement recess 72b and the engagement protrusion 62b of the main shaft member 62 (upper direction in FIGS. 13 and 14). It turns around the hinge part 72a toward the center.
However, in the large cleaning float member 68, the water level W5 is higher than the water level wn in the water storage portion 86 corresponding to the balance position between the weight G of the large cleaning float member 68 in the water storage portion 86 and the buoyancy F. The buoyancy F by the washing water exceeds the own weight G of the large washing float member 68, and the engagement recess 68 d of the large washing float member 68 is engaged with the engagement protrusion 62 c of the main shaft member 62. Since the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is restricted, the valve closing operation in the large washing mode of the drain valve device 24 is not started. ing.

Next, as shown in FIGS. 15 and 16, in the second state during the drainage in the large washing mode of the drain valve device 24, the drainage from the drain port 20 to the toilet body 2 is accompanied by the drainage in the water storage tank 18. While the water level outside the outer control cylinder member 76 decreases to a water level W6 lower than the water level W5 shown in FIGS. 13 and 14, the water level in the water reservoir 86 of the inner control cylinder member 64 is communicated with the shielding member 66. Since the size (communication area S3) of the flow adjustment opening 64a of the inner cylindrical member 64 that overlaps the port 66c is smaller than the size (opening area) of the communication port 58 and the drain port 20 of the drain port forming member 42. The lowering speed v1 of the water level w1 in the water storage section 86 of the inner control cylinder member 64 is made slower than the lowering speed V1 of the water level W6 outside the outer control cylinder member 76 in the water storage tank 18.
Further, in the large washing float member 68, the water level w <b> 1 in the water storage portion 86 of the inner control cylinder member 64 corresponds to a balance position between the own weight G and the buoyancy F of the large washing float member 68 in the water storage portion 86. It is located above the water level wn in the water storage part 86, the buoyancy F by the washing water exceeds the own weight G of the large washing float member 68, and the engaging recess 68d of the large washing float member 68 is the main shaft member 62. In this state, the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is still constrained.

Next, as shown in FIGS. 17 and 18, in the third state in the middle of drainage in the large washing mode of the drain valve device 24, in the water storage tank 18 along with drainage from the drain port 20 to the toilet body 2. While the water level outside the outer control cylinder member 76 is lowered to a water level W7 lower than the water level W6 shown in FIGS. 15 and 16, the water level in the water storage section 86 of the inner control cylinder member 64 is the upper water storage area A1 and the lower water storage. When the water level wn in the water storage part 86 corresponding to the balance position between the dead weight G and the buoyancy F of the large washing float member 68 passes through the boundary surface P1 with the region A2, the water level of the cleaning water in the water storage part 86 is reached. The water storage amount in the water storage portion 86 decreases rapidly before and after passing through the boundary surface P1, and the water level lowering speed v2 in the lower water storage region A2 of the water storage portion 86 of the inner control cylinder member 64 is shown in FIG. And the inner control shown in FIG. So that the earlier than the decrease velocity v1 water level w1 in the upper reservoir region A1 of the reservoir 86 of the member 64.
Further, in the large washing float member 68, the water level in the water storage section 86 decreases from the water level w1 in the upper water storage area A1 of the water storage section 86 of the inner control cylinder member 64 shown in FIGS. 15 and 16, and the water storage section When the water level wn of the lower water storage area A2 of the water storage section 86 corresponding to the balance position between the dead weight G of the large cleaning float member 68 and the buoyancy F in the 86 is reached, the buoyancy F by the cleaning water is increased by the large cleaning float member 68. Below the dead weight G, the large cleaning float member 68 rotates in a direction (downward in FIGS. 17 and 18) in which the main shaft member 62 is disengaged from the engaging protrusion 62c. The engagement between the engagement recess 68d and the engagement protrusion 62c of the main shaft member 62 is released, and the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is started.

  Next, as shown in FIGS. 19 and 20, in the state when drainage is completed in the large washing mode of the drain valve device 24, the drain valve device 24 flows into the water storage tank 18 from the flow adjustment opening 64 a of the inner control cylinder member 64. Thus, the water level in the lower water storage area A2 of the water storage section 86 of the inner control cylinder member 64 is lowered so that the buoyancy of the large cleaning float member 68 is lost. Further, the water level outside the outer control cylinder member 76 in the water storage tank 18 is lower than the water level W7 shown in FIGS. 17 and 18 and lower than the dead water level W4 (DWL) in the small cleaning mode shown in FIG. The water level is lowered to W8, the water level W8 becomes the dead water level (DWL), the valve body 52 comes into contact with the valve seat 50, and the drain port 20 is closed.

  In addition, about the fall rate of the water level of the water storage area | region A of the water storage part 86 of the inner side control cylinder member 64, as shown in FIG. 11, the shielding member 66 is shifted to the circumferential direction R, and the opening 64a of the inner side control cylinder member 64 and shielding are carried out. As the communication area S3 of the member 66 with the communication port 66c is adjusted and set to be smaller, the speed difference with the lowering speed of the water level outside the outer control cylinder member 76 increases, and the main shaft member 62 and the valve body 52 are lowered. The timing at which (valve closing operation) starts is delayed, the dead water level (DWL) in the water storage tank 18 at the end of drainage is lowered, and the total amount of wash water supplied from the water storage tank 18 to the toilet body 2 in the large wash mode Many are set.

Next, referring to FIG. 1 to FIG. 20, a drain valve device according to an embodiment of the present invention, a flush water tank device equipped with the drain valve device, and a flush toilet equipped with the flush water tank device are shown. The operation (action) will be described.
First, with reference to FIGS. 1 to 6, 8, and 9, the small cleaning mode of the two types of cleaning modes executed by the cleaning water tank apparatus including the drain valve device according to the embodiment of the present invention will be described. .
As shown in FIG. 5, in the state before the drainage start in the small washing mode of the drain valve device 24, the valve body 52 contacts the valve seat 50, the drain port 20 is closed, and the water level in the water storage tank 18 is full. The flush water level in the water storage tank 18 stored on the outside of the outer control cylinder member 76 flows into the outer control cylinder member 76 through the slit hole 76b, and the large cleaning float member 68 and The small cleaning float member 70 is submerged.
Further, the engaging recess 72b of the cam member 72 is positioned above the engaging protrusion 62b of the main shaft member 62, so that the both 72b and 62b are not engaged, and the engaging recess 68d of the large cleaning float member 68 is engaged. Is positioned above the engagement protrusion 62c of the main shaft member 62, and the two members 68d and 62c are not engaged.

  Next, as shown in FIG. 2 and FIG. 6, when the drain valve device 24 is in the valve opening state in the small washing mode, the user operates the operation lever 84 (see FIG. 2) in the predetermined small washing mode. When the rotating operation is performed, the wire winding device 82 is activated, and the operation wire 78 is wound with a winding amount smaller than the maximum winding amount in the large cleaning mode, and the main shaft member 62 and the valve of the drain valve unit 40 are wound. The body holding member 60 is pulled up to a predetermined height position lower than each maximum height position, and the drain port 20 is opened. At this time, the rising height (stroke) H of the valve body 52 with respect to the valve seat 50 becomes H1 lower than the maximum stroke H2 in the large washing mode, and the toilet of the flush toilet 1 by the drain valve device 24 of the flush water tank device 16 Draining of the small cleaning mode to the main body 2 is started.

In addition, as shown in FIG. 6, in the state when the drain valve device 24 is opened in the small cleaning mode, the cleaning water in the water storage tank 18 stored outside the outer control cylinder member 76 and the outer control cylinder member 76 are stored. Since the cleaning water in the inside is communicated by the slit hole 76b of the outer control cylinder member 76 and the communication port 58 of the drain port forming member 42, the water level in the water storage tank 18 and the water level in the outer control cylinder member 76 are In both cases, the water level W1 is lower than the water stop level Wf when the water is full, and the large washing float member 68 and the small washing float member 70 are submerged.
Further, the support member 74 is lifted by the buoyancy of the small cleaning float member 70, and the main shaft member 62 and its engagement protrusion 62b are also lifted at the stroke H1 together with the valve body 52. Is engaged with the engagement protrusion 62b of the main shaft member 62, and the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is constrained.
On the other hand, the engaging recess 68d of the large cleaning float member 68 is positioned above the engaging protrusion 62c of the main shaft member 62, and the two members 68d and 62c are not engaged.

Next, as shown in FIG. 8, in the middle of drainage in the small washing mode of the drain valve device 24, the water level in the water storage tank 18 and the outer control cylinder member are accompanied by drainage from the drain port 20 to the toilet body 2. Since the water level inside 76 is lowered to a water level W3 lower than the water level W1 shown in FIG. 6, the buoyancy of the small washing float member 70 is reduced in conjunction with the lowering of the water level, and the small washing float member 70 and The support member 74 is lowered.
Further, when the support member 74 is lowered, the cam member 72 is interlocked with this and moves in a direction (upward in FIG. 8) in which the engagement recess 72b and the engagement protrusion 62b of the main shaft member 62 are disengaged. It rotates around the hinge part 72a.
Further, when the engagement between the engagement recess 72b of the cam member 72 and the engagement protrusion 62b of the main shaft member 62 is released, the main shaft member 62 and the valve body 52 are lowered as the water level decreases, and the drain valve device 24 is small. The valve closing operation in the cleaning mode is started. At this time, the engagement recess 68d of the large cleaning float member 68 is positioned above the engagement protrusion 62c of the main shaft member 62, and the two main portions 68d and 62c are not engaged with each other. The valve closing operation by the lowering of 62 and the valve body 52 is not hindered.

Next, when the main shaft member 62 and the valve body 52 are further lowered as the water level is lowered in FIG. 8, the valve body 52 comes into contact with the valve seat 50 and the drain port 20 is closed as shown in FIG. The drainage in the 24 small cleaning modes ends.
Moreover, in the state at the time of completion | finish of drainage, the water level in the water storage tank 18 and the water level in the outer side control cylinder member 76 fall to the water level W4 lower than the water level W3 shown in FIG. 8, and become a dead water level (DWL). The dead water level W4 (DWL) in the small washing mode is higher than the dead water level W8 (DWL) in the large washing mode shown in FIG.

Next, with reference to FIGS. 1 to 5, 7, and 10 to 20, the large cleaning mode executed by the cleaning water tank device including the drain valve device according to the embodiment of the present invention will be described.
First, the drain valve device 24 in a state before the drainage in the large washing mode as shown in FIG. 5 is the same as in the small washing mode shown in FIG. Is omitted.

  Next, as shown in FIG. 7, when the drain valve device 24 is opened in the large washing mode, the user rotates the operation lever 84 (see FIG. 2) in a direction to execute the predetermined large washing mode. When operated, the wire take-up device 82 is actuated, the operation wire 78 is taken up by a predetermined maximum take-up amount, and the main shaft member 62 and the valve body holding member 60 of the drain valve unit 40 are at their highest height positions. Is raised. At this time, the rising height (stroke) H of the valve body 52 with respect to the valve seat 50 becomes the maximum height (maximum stroke) H2 higher than the lifting height H1 in the small cleaning mode (H2> H1), and the cleaning water tank device The drainage in the large washing mode to the toilet body 2 of the flush toilet 1 by the 16 drain valve devices 24 is started.

Further, as shown in FIG. 7, when the drain valve device 24 is opened in the large washing mode, the valve body 52 rises with respect to the valve seat 50 with the maximum stroke H2 and the drain port 20 is opened. The water level in the water storage tank 18 becomes a water level W2 lower than the water stop water level Wf when the water is full, and the cleaning water in the water storage tank 18 stored outside the outer control cylinder member 76 and the inside of the outer control cylinder member 76 are stored. Since the cleaning water communicates with the slit hole 76b of the outer control cylinder member 76 and the communication port 58 of the drain port forming member 42, the large cleaning float member 68 is submerged, but the small cleaning float member 70 and Each upper portion of the cam member 72 is exposed above the water level W2.
Further, since the main shaft member 62 and its engaging projection 62b as well as the valve body 52 are also raised at the maximum stroke H2, the engaging recess 72b of the cam member 72 is positioned below the engaging projection 62b of the main shaft member 62, Both 72b and 62b will be in the state which is not engaging.
On the other hand, the engagement recess 68d of the large cleaning float member 68 is engaged with the engagement protrusion 62c of the main shaft member 62, and the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is restricted. It becomes a state.

Next, as shown in FIGS. 13 and 14, in the first state in the middle of draining in the large washing mode of the drain valve device 24, the water in the water storage tank 18 is drained from the drain port 20 to the toilet body 2. The water level and the water level inside the outer control cylinder member 76 are lowered to a water level W5 lower than the water level W2 shown in FIG. 7, and the buoyancy of the small washing float member 70 is reduced in conjunction with the lowering of the water level. The float member 70 and the support member 74 are lowered.
When the support member 74 is lowered, the cam member 72 is interlocked with the engagement member 72b to release the engagement between the engagement recess 72b and the engagement protrusion 62b of the main shaft member 62 (upper direction in FIGS. 13 and 14). It turns around the hinge part 72a toward the center.

  On the other hand, as shown in FIGS. 13 and 14, in the large washing float member 68, the water level W <b> 5 corresponds to the balance position between the own weight G and the buoyancy F of the large washing float member 68 in the water reservoir 86. The buoyancy F due to the washing water exceeds the own weight G of the large washing float member 68, and the engagement recess 68 d of the large washing float member 68 is formed on the main shaft member 62. Since the engaging protrusion 62c is engaged and the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is restricted, the valve closing operation of the drain valve device 24 in the large washing mode is performed. Never be started.

Next, as shown in FIGS. 15 and 16, in the second state during the drainage in the large washing mode of the drain valve device 24, the drainage from the drain port 20 to the toilet body 2 is accompanied by the drainage in the water storage tank 18. While the water level outside the outer control cylinder member 76 decreases to a water level W6 lower than the water level W5 shown in FIGS. 13 and 14, the water level in the water reservoir 86 of the inner control cylinder member 64 is communicated with the shielding member 66. Since the size (communication area S3) of the flow adjustment opening 64a of the inner cylindrical member 64 that overlaps the port 66c is smaller than the size (opening area) of the communication port 58 and the drain port 20 of the drain port forming member 42. The lowering speed v1 of the water level w1 in the water storage section 86 of the inner control cylinder member 64 becomes slower than the lowering speed V1 of the water level W6 outside the outer control cylinder member 76 in the water storage tank 18.
Further, in the large washing float member 68, the water level w <b> 1 in the water storage portion 86 of the inner control cylinder member 64 corresponds to a balance position between the own weight G and the buoyancy F of the large washing float member 68 in the water storage portion 86. It is located above the water level wn in the water storage part 86, the buoyancy F by the washing water exceeds the own weight G of the large washing float member 68, and the engaging recess 68d of the large washing float member 68 is the main shaft member 62. The engagement protrusion 62c is engaged, and the lowering operation (valve closing operation) of the main shaft member 62 and the valve body 52 is still restrained.

  Next, as shown in FIGS. 17 and 18, in the third state in the middle of drainage in the large washing mode of the drain valve device 24, in the water storage tank 18 along with drainage from the drain port 20 to the toilet body 2. While the water level outside the outer control cylinder member 76 is lowered to a water level W7 lower than the water level W6 shown in FIGS. 15 and 16, the water level in the water storage section 86 of the inner control cylinder member 64 is the upper water storage area A1 and the lower water storage. The cleaning water in the water storage section 86 passes through the boundary surface P1 with the region A2 and reaches the water level wn in the water storage section 86 corresponding to the balance position between the weight G of the large cleaning float member 68 and the buoyancy F. Before and after the water level descends and passes through the boundary surface P1, the amount of water stored in the water storage section 86 decreases rapidly, and the rate of decrease v2 of the water level in the lower water storage area A2 of the water storage section 86 of the inner control cylinder member 64 is shown in FIG. 15 and inside shown in FIG. Earlier than the decrease velocity v1 water level w1 in the upper reservoir region A1 of the reservoir 86 of the control cylinder member 64.

  Also, as shown in FIGS. 17 and 18, in the large cleaning float member 68, the water level in the water storage section 86 is higher than the upper water storage area A1 of the water storage section 86 of the inner control cylinder member 64 shown in FIGS. When the water level falls from the inner water level w1 and reaches the water level wn in the lower water storage region A2 of the water storage portion 86 corresponding to the balance position between the dead weight G of the large washing float member 68 and the buoyancy F in the water storage portion 86, The buoyancy F is below the dead weight G of the large cleaning float member 68 (F <G), and the large cleaning float member 68 releases the engagement with the engagement protrusion 62c of the main shaft member 62 (FIGS. 17 and 18). And the engagement recess 68d of the large cleaning float member 68 and the engagement protrusion 62c of the main shaft member 62 are released, and the main shaft member 62 and the valve body 52 are lowered (the valve closing operation). ) Is started.

Further, as shown in FIGS. 17 and 18, the wash water stored in the water storage area A of the water storage portion 86 of the inner control cylinder member 64 flows from the opening 64 a for adjusting the flow rate of the inner control cylinder member 64. The water flows out from the opening 76c of the outer control cylinder member 76 into the water storage tank 18 outside the drain valve device 24 through the communication port 66c of the shielding member 66 that communicates.
Moreover, the timing at which the descending operation (valve closing operation) of the main shaft member 62 and the valve body 52 is started is delayed so that the dead water level (DWL) in the water storage tank 18 at the end of drainage is set low, and water is stored in the large washing mode. When it is desired to set a large total amount of washing water supplied from the tank 18 to the toilet body 2, the shielding member 66 is shifted in the circumferential direction R, and the opening 64 a of the inner control cylinder member 64 and the communication port 66 c of the shielding member 66 are connected. The communication area S3 is set small, and the speed difference between the water level lowering speed outside the outer control cylinder member 76 and the water level lowering speed in the water storage region A of the water storage section 86 of the inner control cylinder member 64 is set large.
On the other hand, when the dead water level (DWL) in the water storage tank 18 at the end of drainage is set high and it is desired to set the total amount of cleaning water supplied from the water storage tank 18 to the toilet body 2 in the large cleaning mode, the shielding member 66 is shifted in the circumferential direction L, the communication area S3 between the opening 64a of the inner control cylinder member 64 and the communication port 66c of the shielding member 66 is set large, and the lowering speed of the water level outside the outer control cylinder member 76 and the inner control cylinder The speed difference from the water level lowering speed of the water storage area A of the water storage section 86 of the member 64 is set small.

Next, as shown in FIGS. 19 and 20, in the state when drainage is completed in the large washing mode of the drain valve device 24, the drain valve device 24 flows into the water storage tank 18 from the flow adjustment opening 64 a of the inner control cylinder member 64. Thus, the water level in the lower water storage area A2 of the water storage section 86 of the inner control cylinder member 64 is lowered, and the buoyancy of the large cleaning float member 68 is lost.
Further, the water level outside the outer control cylinder member 76 in the water storage tank 18 is lower than the water level W7 shown in FIGS. 17 and 18 and lower than the dead water level W4 (DWL) in the small cleaning mode shown in FIG. The water level is lowered to W8, the water level W8 becomes the dead water level (DWL), the valve body 52 comes into contact with the valve seat 50, and the drain port 20 is closed.

  According to the drain valve device 24 according to the first embodiment of the present invention described above, the step portion 90 formed so as to raise a part of the bottom surface 88 in the water storage portion 86 of the inner control cylinder member 64 is the inner control cylinder member. In order to function as a water storage area reduction means for rapidly reducing the water storage area A of the 64 water storage sections 86, the water level w in the water storage section 86 of the inner control cylinder member 64 after the valve body 52 opens the drain port 20. , And the water level in the water storage section 86 of the inner control cylinder member 64 is the same plane as the raised surface 90b of the stepped section 90 in the water storage section 86, and the boundary surface P1 between the upper water storage area A1 and the lower water storage area A2 Until the water level wn in the water storage portion 86 corresponding to the balance position between the dead weight G and the buoyancy F of the large washing float member 68 passes through the boundary surface Before and after passing through P1, The amount of water suddenly decreases, and the water level lowering speed v2 in the lower water storage area A2 of the water storage section 86 of the inner control cylinder member 64 becomes the upper water storage area of the water storage section 86 of the inner control cylinder member 64 shown in FIGS. It is made faster than the decreasing speed v1 of the water level w1 in A1. Therefore, the buoyancy F due to the cleaning water is less than the own weight G of the large cleaning float member 68, and the large cleaning float member 68 releases the engagement with the engagement protrusion 62c of the main shaft member 62 (see FIGS. 17 and 18). Smoothly downward), the engagement between the engagement recess 68d of the large washing float member 68 and the engagement protrusion 62c of the main shaft member 62 can be smoothly released, and the main shaft member 62 and the valve body 52 can be released. Can be smoothly started. As a result, it is possible to prevent the total amount of washing water supplied from the drain port 20 of the water storage tank 18 of the washing water tank device 16 to the toilet body 2 of the flush toilet 1 from varying.

  Furthermore, according to the drain valve device 24 according to the present embodiment, the flow rate adjusting opening 64a formed in the water storage portion 86 of the inner control cylinder member 64 is substantially circumferentially positioned below the side peripheral wall portion 64b of the water storage portion 86. Since it is formed to extend in a slit shape, the attachment position of the shielding member 66 is changed to adjust the communication area S3 between the flow rate adjustment opening 64a of the inner control cylinder member 64 and the communication port 66c of the shielding member 66. At this time, the communication port 66c of the shielding member 66 is shifted in the horizontal direction with respect to the flow rate adjustment opening 64a of the inner control cylinder member 64, whereby the flow rate adjustment opening 64a of the inner control cylinder member 64 is removed from the shielding member 66. The influence of variation in the water pressure in the vertical direction when passing through the communication port 66c can be suppressed, and variation in the amount of cleaning water flowing out from the flow rate adjustment opening 64a of the inner control cylinder member 64 is suppressed. It is possible. As a result, it is possible to prevent the total amount of washing water supplied from the drain port 20 of the water storage tank 18 of the washing water tank device 16 to the toilet body 2 of the flush toilet 1 from varying.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 4 Bowl part 6 Trap line 6a Drain trap line inlet 8 Rim 10 First outlet 12 Reservoir part 14 Second outlet 16 Washing water tank device 18 Reservoir 18a Reservoir bottom DESCRIPTION OF SYMBOLS 20 Drain port 22 Water supply apparatus 24 Drain valve apparatus 26 Water supply pipe 28 Water supply valve 30 Float 32 Drain outlet 34 Refill pipe 36 Overflow pipe 38 Drain outlet unit 40 Drain valve unit 42 Drain outlet formation member 44 Seal member 46 Fastening member 48 Overflow pipe attachment Portion 50 Valve seat 52 Valve body 54 Upper end portion of drainage port forming member 56 Column portion 58 Communication port 60 Valve body holding member 62 Main shaft member 62a Main shaft member upper end portion 62b Main shaft member engagement protrusion 62c Main shaft member engagement protrusion 64 Inner control cylinder member 64a Flow rate adjustment opening 64b Side peripheral wall 6 c Guide hole of main shaft member 64d Mounting hole for support member 64e Hinge coupling hole 64f Protrusion 66 Shielding member 66a Wall portion 66b Fitting recess 66c Communication port 68 Float member for large cleaning 68a Float main body portion 68b Arm portion 68c Hinge protrusion portion 68d Engagement Joint recess 70 Small cleaning float member 72 Cam member 72a Cam member hinge 72b Cam member engagement recess 74 Support member 76 Outer control cylinder member 76a Outer control cylinder member side peripheral surface 76b Slit hole 76c Open 78 Operation wire 80 Guide member 80a Guide hole 80b Support member mounting hole 82 Wire winding device 84 Operation lever 86 Water storage part of inner control cylinder member 88 Bottom surface of water storage part of inner control cylinder member 90 Step part of water storage part of inner control cylinder member (water storage) Area reduction means)
90a Inner wall surface of the water storage section of the inner control cylinder member 90b Raised bottom surface of the water storage section of the inner control cylinder member 92 Inner wall surface of the water storage section of the inner control cylinder member 94 Central inner wall surface of the water storage section of the inner control cylinder member 96 Inner control cylinder Outer inner wall surface 98 of the water storage part of the member Intermediate inner wall surface 100 of the water storage part of the inner control cylinder member Inner peripheral wall surface of the water storage part of the inner control cylinder member

Claims (5)

A drain valve device for a washing water tank for storing washing water for washing a toilet,
A valve body for opening and closing a drain outlet disposed on the bottom surface of the washing water tank;
A control cylinder that controls the movement of the valve body, and includes a water storage section that forms a water storage area for storing cleaning water, and the cleaning water stored in the water storage section flows out into the cleaning water tank at a predetermined flow rate. The control cylinder in which the opening to be formed is formed;
A float provided in the water reservoir of the control cylinder so as to be lowered when the engagement with the valve body is released due to a drop in the water level in the water reservoir of the control cylinder. ,
After the valve body opens the drain, when the water level in the water storage part of the control cylinder descends and passes through the balance position between the weight and buoyancy of the float, the water level in the water storage part of the control cylinder A predetermined height position above the balance position in the water storage region in the water storage section so that the engagement between the float and the valve body is released and the valve body is closed. A storage area reduction means for rapidly reducing the storage area below the storage area;
A drain valve device characterized by comprising:   The water storage area reducing means is a step portion formed so as to raise a part of a bottom portion in the water storage portion of the control cylinder, and an upper surface of the step portion forms a bottom raising surface of the water storage portion, and the balance The drain valve device according to claim 1, wherein the drain valve device is located above the position.   The opening formed in the water storage part of the control cylinder is formed to extend in a slit shape in a substantially horizontal direction at a position below the water storage part, and further communicates with a predetermined width communicating with a part of the opening of the control cylinder. A shielding member formed on the outside of the opening of the control cylinder, and the shielding member is configured such that the opening of the control cylinder and the communication port are changed by changing a mounting position to the control cylinder. The drainage valve device according to claim 1 or 2, wherein the amount of washing water flowing out from the water storage section of the control cylinder into the washing water tank can be adjusted by adjusting the communication area.   A flush water tank device comprising the drain valve device according to any one of claims 1 to 3.   A flush toilet comprising the flush water tank apparatus according to claim 4.

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