JP7255406B2 - Drainage valve device, flush water tank device and flush toilet - Google Patents

Description

The disclosed embodiments relate to drain valve devices, flush water tank devices and flush toilets.

Conventionally, a flush water tank device for storing flush water for flushing a toilet body is provided with a drain valve device for opening and closing a drain port in the flush water tank. Among drain valve devices, there is a so-called direct-acting type in which a valve body moves (vertically moves) in a vertical direction with respect to a drain port (see, for example, Patent Document 1).

Such a drain valve device comprises a pedestal and an overflow pipe. The pedestal is arranged substantially directly above the drain port. The pedestal has a plurality of pillars arranged concentrically with respect to the center of the drain port at predetermined intervals. The plurality of pillars are arranged on the outer side of the valve body that opens and closes the drain port, and guides the vertical movement of the valve body. The overflow pipe has a cylindrical shape and is arranged on the side of the pedestal, and discharges washing water to a drain port when the water level in the washing water tank exceeds the height of the upper end opening.

JP 2017-133246 A

By the way, in some of the drain valve devices described above, the base is fixed to the drain port by tightening screws at a plurality of locations on the outer side of the drain port.

However, for example, when the pedestal is fixed with a screw, tightening of the screw may cause the column portion to fall toward the axis of the valve body. If the pillars fall down, the space between the pillars becomes narrower, and the vertically moving valve body gets caught between the pillars. something happened.

One aspect of the embodiments has been made in view of the above, and provides a drain valve device, a flush water tank device, and a flush toilet that are capable of suppressing malfunction of the valve body and stabilizing the opening and closing of the drain port. intended to provide

A drain valve device according to an aspect of an embodiment includes a valve body disposed above a drain port formed in the bottom surface of a wash water tank in which cleansing water is stored and which moves vertically to open and close the drain port; a float for lowering the valve body in conjunction with a decrease in the water level in the wash water tank; and a plurality of pillars arranged at predetermined intervals on the outer peripheral portion of the valve body on the upper surface of the pedestal and guiding the movement of the valve body. It has a rib projecting toward it, and a notch is formed in the rib.

According to this configuration, the notch is formed in the rib of the pedestal so that when the pedestal is fixed to the bottom surface of the flushing water tank, the pillar is directed toward the axis of the valve body by fastening at the fixed position. You can prevent yourself from falling over. As a result, a constant interval is maintained between the plurality of pillars, and the pillars do not interfere with the vertical movement (vertical movement) of the valve body. opening and closing can be stabilized.

Moreover, in the drain valve device described above, the notch portion is formed to avoid the fixed position. According to such a configuration, it is possible to prevent the column portion from collapsing toward the axis of the valve body while maintaining the rigidity of the pedestal fixed to the bottom surface.

Further, in the drain valve device described above, the pedestal has a sealing surface formed by an annular sealing member on the inner side of the rib on the peripheral portion of the lower surface. According to such a configuration, deformation of the sealing surface can be suppressed due to the presence of the notch. Thereby, the deterioration of the sealing property can be suppressed.

Further, in the drain valve device described above, the cleaning water tank is made of ceramics. According to this configuration, when the pedestal is fixed to the bottom surface of a wash water tank made of ceramic, which tends to undulate, it is possible to prevent the pillar from collapsing toward the axis of the valve body by fastening at the fixed position. can.

A flushing water tank device according to an aspect of an embodiment includes the drain valve device described above and the flushing water tank to which the drain valve device is attached.

According to this configuration, in the drain valve device, when the pedestal is fixed to the bottom surface of the wash water tank, it is possible to prevent the column portion from falling toward the axis of the valve body by fastening at the fixed position. As a result, a constant interval is maintained between the plurality of pillars, and the pillars do not interfere with the vertical movement of the valve body. can be done.

A flush toilet according to one aspect of an embodiment includes the flush water tank device described above and a toilet bowl body to which flush water is supplied from the flush water tank.

According to this configuration, in the drain valve device attached to the wash water tank device, the pillar falls down toward the axis of the valve body by fastening at the fixed position when the base is fixed to the bottom surface of the wash water tank. can be suppressed. As a result, a constant interval is maintained between the plurality of pillars, and the pillars do not interfere with the vertical movement of the valve body. can be done.

According to one aspect of the embodiment, it is possible to suppress malfunction of the valve body and stabilize the opening and closing of the drain port.

FIG. 1 is a schematic side sectional view showing the flush toilet according to the embodiment. FIG. 2 is a schematic side sectional view showing the washing water tank device according to the embodiment. FIG. 3A is a side view (part 1) showing the drain valve device according to the embodiment; FIG. 3B is an enlarged view of part B in FIG. 3A. FIG. 4 is a side view (No. 2) showing the drain valve device according to the embodiment. FIG. 5 is a perspective view (Part 1) showing the drain valve device according to the embodiment. FIG. 6 is a perspective view (Part 2) showing the drain valve device according to the embodiment. FIG. 7A is an explanatory diagram (part 1) of the bottom surface of the wash water tank. FIG. 7B is an explanatory diagram (part 2) of the bottom surface of the wash water tank. FIG. 8A is a side view showing an attached state of the drain valve device according to the embodiment; FIG. 8B is a side view showing an attached state of the drain valve device according to the comparative example.

Hereinafter, embodiments of a drain valve device, a flush water tank device, and a flush toilet disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

<Flush toilet bowl>
First, an example of a flush toilet 1 according to an embodiment will be described with reference to FIG. FIG. 1 is a schematic side sectional view showing a flush toilet 1 according to an embodiment.

Note that FIG. 1 shows a three-dimensional orthogonal coordinate system including the Z-axis whose positive direction is the vertically upward direction. Hereinafter, the positive direction of the X axis is defined as rightward, the negative direction of the X axis is defined as leftward, the positive direction of the Y axis is defined as forward, and the negative direction of the Y axis is defined as rearward. is sometimes referred to as the front-rear direction, and the Z-axis direction is sometimes referred to as the vertical direction. The Cartesian coordinate system may also be shown in other figures.

As shown in FIG. 1 , the flush toilet 1 includes a toilet body 2 and a flush water tank device 4 . The toilet body 2 is installed on the floor of the toilet room. In addition, the toilet body 2 is not limited to a floor-standing type installed on the floor, and may be a wall-mounted type installed on a wall surface.

The toilet body 2 includes a bowl portion 6, a water conduit 8, and a drain trap conduit 10. - 特許庁The bowl portion 6 receives the user's waste. The bowl portion 6 includes a rim portion 12 , a first spout 7 and a second spout 16 .

The rim portion 12 overhangs the upper edge portion of the bowl portion 6 toward the center side of the bowl portion 6 in plan view. The first water discharger 7 is provided on the left side of the rim portion 12 and discharges forward cleansing water supplied from a water conduit 8, which will be described later. The second water discharger 16 is provided above the surface of the reservoir water, which will be described later, and discharges the wash water supplied from the water conduit 8 in the left-right direction.

The water conduit 8 guides wash water supplied from a wash water tank device 4 to be described later to the bowl portion 6 . The drain trap pipe line 10 has an inlet connected to the lower portion of the bowl portion 6 and discharges wastes in the bowl portion 6 to an external drain pipe (not shown) of the toilet body 2 .

The drain trap line 10 also has an ascending channel portion extending upwardly from the inlet and a descending channel portion extending downwardly from the ascending channel portion and connected to an external drain line. In this case, from the bowl portion 6 to the ascending channel portion of the drain trap pipe 10, wash water is stored for forming a water seal state. The stored washing water is called "reserved water", and the water surface of the reserved water is the reservoir water surface.

The flush water tank device 4 is installed above the rear portion of the toilet body 2 and stores flush water supplied to the toilet body 2 . A detailed configuration of the wash water tank device 4 will be described later with reference to FIG.

The flush toilet bowl 1 described above is of a so-called wash-off type in which dirt is flushed away by the action of running water caused by the drop of flush water in the bowl portion 6 . In the flush toilet bowl 1, the flush water discharged forward from the first spout 7 swirls and descends to wash the bowl portion 6, and the flush water discharged from the second spout 16 flows vertically. direction to agitate and push out the waste into the drain trap line 10 . The flush toilet bowl 1 is not limited to the wash-off type, and may be of a siphon type or the like.

<Washing water tank device>
Next, an example of the washing water tank device 4 according to the embodiment will be described with reference to FIG. FIG. 2 is a schematic side sectional view showing the washing water tank device 4 according to the embodiment. Specifically, FIG. 2 is a sectional view taken along line AA in FIG. Since FIG. 2 shows an example of the washing water tank device 4, the direction of the drain valve device 24 installed in the washing water tank 18 is not necessarily as shown in this drawing.

As shown in FIG. 2, the wash water tank device 4 includes a wash water tank 18, a lid portion 20 (see FIG. 1), a water supply device 22, and a drain valve device 24. The washing water tank 18 is made of ceramics. The washing water tank 18 may be made of ceramic, resin, or a combination of ceramic and resin. The washing water tank 18 is, for example, a substantially rectangular container having an opening at the top.

The lid portion 20 is attached to the upper portion of the cleaning water tank 18 and closes the upper opening. Note that the lid portion 20 is omitted in FIG.

The washing water tank device 4 also includes a lever handle 26 and a spindle 28 . The lever handle 26 is arranged on the outer surface of the wash water tank 18 and is rotatable around the axis of the base 26a. The spindle 28 is coaxially connected to the pivot shaft of the lever handle 26 and extends substantially horizontally within the cleaning water tank 18 . The spindle 28 rotates forward and backward in the figure by rotating the lever handle 26 .

The tip of the spindle 28 is positioned substantially directly above the drain valve device 24 . One end of a ball chain 30 as a connecting member is connected to the tip of the spindle 28 . The other end of the ball chain 30 is connected to a float 48 of the drain valve device, which will be described later.

The bottom surface 18a of the wash water tank 18 is formed with a drain port 32 that opens in a substantially circular shape. The drain port 32 communicates with the water conduit 8 (see FIG. 1) of the toilet body 2 to supply flush water to the water conduit 8 . The drain port 32 is opened and closed by a drain valve device.

The washing water tank device 4 also includes a water supply device 22 . The water supply device 22 includes a water supply pipe 34 , a small tank 36 and a water supply float 38 . The water supply pipe 34 is connected to an external water supply source (not shown) of the washing water tank 18 and extends upward from the bottom surface 18 a of the washing water tank 18 .

A water supply port 34 a for supplying washing water into the washing water tank 18 is provided at the bottom of the water supply pipe 34 . A diaphragm-type water supply valve (not shown) is provided above the water supply pipe 34 . The water supply valve switches between supplying and stopping cleaning water supplied from the water supply pipe 34 .

The small tank 36 is detachably provided on the side of the water supply pipe 34 . The small tank 36 is a substantially rectangular container having a water storage area inside. The small tank 36 is provided with a check valve (not shown) for opening and closing an opening (not shown) formed in the bottom surface. A water supply float 38 is arranged in the small tank 36 and moves up and down according to the water level of the wash water in the small tank 36 .

The water supply float 38 is connected to a water supply valve (not shown) via an oscillating body 40, and opens and closes the water supply valve by vertical movement. Specifically, the water supply float 38 descends as the water level in the small tank 36 drops as the wash water stored in the small tank 36 is drained from the opening in the bottom of the small tank 36 . . The water supply valve is opened by lowering the water supply float 38, and supplies washing water into the washing water tank 18 from the water supply port 34a.

<Drain valve device>
Next, the drain valve device 24 according to the embodiment will be described. First, the configuration of the drain valve device 24 according to the embodiment will be described with reference to FIGS. 2 to 6. FIG. FIG. 3A is a side view showing the drain valve device 24 according to the embodiment. FIG. 3B is an enlarged view of part B in FIG. 3A.

FIG. 4 is a side view showing the drain valve device 24 according to the embodiment. 4 shows a side view in a direction different from the side view shown in FIG. 3A. 5 and 6 are perspective views showing the drain valve device 24 according to the embodiment. 5 shows the drain valve device 24 viewed from above, and FIG. 6 shows the drain valve device 24 viewed from below.

As shown in FIG. 2, the drain valve device 24 is arranged above the drain port 32 of the wash water tank 18 . The drain valve device 24 is of a so-called direct-acting type in which a valve body 42, which will be described later, moves (moves up and down) in the vertical direction to open and close the drain port 32. As shown in FIG. As shown in FIGS. 2-6, the drain valve device 24 comprises a pedestal 44 and an overflow pipe 46 .

The pedestal portion 44 is arranged substantially directly above the drain port 32 . The pedestal portion 44 regulates the vertical movement range of the valve body 42 . The pedestal portion 44 includes a pedestal 441 and a plurality of pillars 442 .

The pedestal 441 is arranged above the drain port 32 , specifically, substantially directly above the drain port 32 . The pedestal 441 is disk-shaped and has an opening (central opening) 443 (see FIG. 6) formed in the center. The drainage port 32 is closed by closing the central opening 443 of the base 441 with the valve body 42 .

A plurality of pillars 442 are provided on an upper surface 444 of the pedestal 441 . The plurality of pillars 442 are arranged on the upper surface 444 of the base 441 at predetermined intervals around the periphery (peripheral edge) of the central opening 443, and are concentric with the center of the central opening 443 (also the center of the drain port 32). arranged in a row. That is, the plurality of pillars 442 are arranged concentrically with respect to the center of the drain port 32 at predetermined intervals on the outer peripheral portion of the valve body 42 that closes the central opening 443 . The plurality of pillars 442 arranged in this manner guide the vertical movement of the valve body 42 .

A drainage space 44 c communicating with the drainage port 32 is formed in the lower part of the pedestal 441 . The wash water in the wash water tank 18 is drained from the drain port 32 after passing through the drain space 44 c through the opening 44 d between the pillars 442 . Moreover, the base 441 has ribs 446 on the lower surface 445 of the base 441 . The rib 446 is provided on the periphery of the lower surface 445 of the pedestal 441 and protrudes downward from the lower surface 445 . A notch portion 447 to be described later is formed in the rib 446 .

The pedestal 441 is attached to the bottom surface 18a (see FIG. 2) of the wash water tank 18 at a plurality of fixed positions P (see FIG. 7A) in the vicinity of the drain port 32, such as the outer peripheral edge of the drain port 32, with fastening members such as screws. It is secured by fastening at 448 . By fixing the pedestal 441 to the bottom surface 18 a of the wash water tank 18 in this manner, the drain valve device 24 is attached inside the wash water tank 18 .

A rib 446 formed on a lower surface 445 of the pedestal 441 has a cutout portion 447 formed by cutting out a portion of the rib 446 . As shown in FIGS. 5 and 6 , the cutout portion 447 is formed to avoid the fastening member 447 on the peripheral edge portion of the lower surface 445 of the pedestal 441 . That is, the notch portion 447 is formed to avoid a plurality of fixed positions P when the drain valve device 24 is installed.

As shown in FIG. 6, the notch 447 is preferably notched so as to leave the rib 446 at an angle θ within the range of 80° to 45°. The notch 447 is more preferably notched so as to leave the rib 446 within the range of 45°. In addition, as shown in FIG. 3B, it is preferable that the cutout portion 447 is chamfered at the joint portion 446a with the rib 446. As shown in FIG.

The pedestal 441 also has a sealing surface 449 . As shown in FIG. 6, the sealing surface 449 is formed by a sealing member 450 arranged on the lower surface 445 of the pedestal 441 . Sealing member 450 is, for example, a member made of rubber. Seal member 450 is formed in an annular shape. The seal member 450 is arranged inside the rim 446 at the peripheral edge (inner peripheral edge) of the lower surface 445 of the pedestal 441 . Seal member 450 is retained between rim 446 and peripheral wall 451 projecting downwardly from the peripheral edge of central opening 443 .

The overflow pipe 46 is provided integrally with the pedestal portion 44 on the side of the pedestal portion 44 . The overflow pipe 46 is cylindrically formed. The overflow pipe 46 is arranged with one end opening (upper end opening) facing upward. In addition, the overflow pipe 46 has the other end opening (lower end opening) arranged substantially perpendicularly to the upper end opening, and the lower end opening is communicated with the drainage space 44c.

The overflow pipe 46 is provided to prevent wash water from overflowing from the wash water tank 18 . In the overflow pipe 46 , when the water level in the wash water tank 18 exceeds the height of the upper end opening, the wash water flows into the overflow pipe 46 and is discharged to the drain port 32 .

The drain valve device 24 also includes a valve body 42 and a float 48 . The valve body 42 is positioned above the drain port 32 formed in the bottom surface 18 a of the cleaning water tank 18 . The valve body 42 moves up and down to open and close the drain port 32 . A float 48 is attached to the valve body 42 . The float 48 lowers the raised valve body 42 in conjunction with the lowering of the water level in the wash water tank 18 .

The valve body 42 is lifted by the rotation of the spindle 28 (see FIG. 2) accompanying the rotation of the lever handle 26 to open the drain valve 32 . In addition, the valve body 42 descends together with the float 48 as the water level drops to close the drain valve 32 . The vertical movement of the valve body 42 is guided by the plurality of pillars 442 as described above.

The valve body 42 is formed in a disc shape. The valve body 42 has a rubber seal portion 42 a on its lower surface facing the drain port 32 . Further, the valve body 42 is provided so as to be vertically movable within a predetermined range on the pedestal portion 44 . In other words, the pedestal portion 44 restricts the vertical movement of the valve body 42 within a predetermined range.

The valve body 42 closes the drain port 32 by coming into contact with the pedestal 441 at the lowest position of its movable range. Further, the valve body 42 has a flange portion 42b. The flange portion 42b forms an annular sealing surface together with the sealing portion 42a.

The float 48 includes an inner cylinder 48a and an outer cylinder 48b. The inner cylinder 48a is formed in a cylindrical shape with a closed upper end. The outer cylinder 48b is formed in a cylindrical shape with an open upper end, and is arranged outside the inner cylinder 48a. The lower ends of the inner cylinder 48 a and the outer cylinder 48 b are closed by the lower surface 48 c , and the inner cylinder 48 a and the outer cylinder 48 b are connected to the valve body 42 and provided integrally with the valve body 32 .

When the water level WL (see FIG. 2) in the wash water tank 18 drops and reaches a predetermined height, the float 48 descends in conjunction with the subsequent drop in the water level WL. The inner cylinder 48a of the float 48 is formed so that the bottom is open. As a result, the float 48 receives an upward buoyant force due to the air retained in the internal space of the float 48 in a state where wash water is present around the float 48 .

In this manner, the float 48 generates a predetermined amount of buoyancy during drainage, and when the water level WL in the wash water tank 18 drops and reaches a predetermined height, the float 48 descends in conjunction with the subsequent drop in the water level WL. Therefore, it is possible to drain water up to the dead water level set at a predetermined height.

Here, an event occurred in which the plurality of column portions 442 fell toward the axial center L of the valve body 42 when the drain valve device 24 was fixed. When the column portion 442 falls toward the axial center L of the valve body 42, as shown in FIG. hinders the vertical movement of the valve body 42 . If the vertical movement of the valve body 42 is impeded, the opening and closing of the valve body 42 becomes unstable, such as being fixed at a midway position in the vertical direction.

The inventors of the present application investigated the reason why the column portion 442 collapsed, and found that the bottom surface 18a of the washing water tank 18 was undulating. Next, with reference to FIGS. 7A and 7B, the cause of the collapse of the column portion 442 will be described. 7A and 7B are explanatory diagrams of the bottom surface 18a of the wash water tank 18. FIG. 7A is a schematic plan view showing the undulations of the bottom surface 18a, and FIG. 7B is a schematic side view showing the undulations of the bottom surface 18a.

As shown in FIGS. 7A and 7B, the bottom surface 18a of the wash water tank 18 is undulating due to the mixture of high portions 181 and low portions 182. As shown in FIGS. Note that FIG. 7A shows a high portion 181 and a low portion 182 where the dots are sparse and dense. In FIG. 7A, high portions 181 are shown dense, and low portions 182 are shown sparse.

Especially when the wash water tank 18 is made of ceramic, such undulations are formed during manufacturing. Then, when the drain valve device 24 is fixed by fastening at a plurality of (two) fixing positions P near the drain port 32, the pedestal 441 (see FIG. 3A, etc.) is deformed, and the deformation of the pedestal 441 causes the column portion 442 to be deformed. I found myself falling over.

The deformation amount of the pedestal 441 increases as the undulation of the bottom surface 18a increases, that is, as the height difference between the high portion 181 and the low portion 182 increases. In addition to the undulation of the bottom surface 18a, aging also affects the deformation of the pedestal 441. As shown in FIG.

In this embodiment, by forming the notch portion 447 in the rib 446, deformation of the pedestal 441 as described above can be suppressed, and collapse of the column portion 442 can be suppressed.

Next, the effect of suppressing deformation of the pedestal 441 in the attached state of the drain valve device 24 according to the embodiment will be described with reference to FIGS. 8A and 8B. FIG. 8A is a side view showing an attached state of the drain valve device 24 according to the embodiment. FIG. 8B is a side view showing an attached state of the drain valve device 24A according to the comparative example. It should be noted that the drain valve device 24 as a comparative example shown in FIG.

As shown in FIG. 8A, when the drain valve device 24 is attached to the undulating bottom surface 18a, even if the lower surface 445 of the pedestal 441 and the bottom surface 18a gradually approach each other due to fastening, the notch 447 absorbs the undulations and the pedestal is closed. Deformation of 441 is suppressed.

As shown in FIG. 8B, when the drain valve device 24A without the notch 447 is attached to the undulating bottom surface 18a, when the bottom surface 445 of the pedestal 441 and the bottom surface 18a approach each other due to fastening, the arrows in the figure , the pedestal 441 follows the undulation, and the pedestal 441 is deformed.

In the example shown in FIG. 8B, the pedestal 441 floats upward in the portion located in the high portion 181 of the bottom surface 18a, sinks downward in the portion located in the low portion 182, and extends inward as shown by the two-dot dashed line. Warp. When the pedestal 441 warps inward, the column portion 447 collapses inward as indicated by the double-dotted dashed line.

According to the drain valve device 24 according to the above-described embodiment, the cutout portion 447 is formed in the rib 446 of the pedestal 441, so that when the pedestal 441 is fixed to the bottom surface 18a of the wash water tank 18, By fastening, the column portion 447 can be prevented from collapsing toward the axis L of the valve body 42 . As a result, the plurality of column portions 447 are maintained at constant intervals, and the column portions 447 do not hinder the vertical movement of the valve body 42 , so malfunction of the valve body 42 can be suppressed, and the drain port 32 is closed. The opening and closing can be stabilized, and water stoppage failure can be suppressed.

In addition, by forming the notch portion 447 so as to avoid the fixing position P, it is possible to prevent the column portion 447 from collapsing while maintaining the rigidity of the pedestal 441 fixed to the bottom surface 18a.

Moreover, deformation of the sealing surface 449 can be suppressed by the notch 447 . Thereby, the deterioration of the sealing property can be suppressed.

In addition, when fixing the pedestal 441 to the bottom surface 18a of the wash water tank 18 made of ceramic, which tends to undulate, the fastening at the fixed position P prevents the pillar 447 from collapsing toward the axis L of the valve body 42. can be done.

According to the washing water tank device 18 according to the above-described embodiment, in the drain valve device 24, it is possible to prevent the column portion 447 from collapsing when fixing the pedestal 441 to the bottom surface 18a of the washing water tank 18. The column portions 447 are maintained at constant intervals, and the column portions 447 do not hinder the vertical movement of the valve body 42 . Therefore, malfunction of the valve body 42 can be suppressed, opening and closing of the drain port 32 can be stabilized, and water shutoff failure can be suppressed.

According to the flush toilet 1 according to the embodiment described above, in the drain valve device 24 attached to the flush water tank device 4, it is possible to prevent the column portion 447 from collapsing when the pedestal 441 is fixed to the bottom surface 18a of the flush water tank 18. Therefore, the plurality of columns 447 are maintained at regular intervals, and the columns 447 do not hinder the vertical movement of the valve body 42 . Therefore, malfunction of the valve body 42 can be suppressed, opening and closing of the drain port 32 can be stabilized, and water shutoff failure can be suppressed.

In the above-described embodiment, the cutout portion 447 is entirely cut out so as to leave the rib 446 arranged at the fixed position P, but the cutout portion 447 is not limited to this. , may be cut out intermittently.

Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments so shown and described. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and equivalents thereof.

1 flush toilet bowl 2 toilet body 4 flush water tank device 18 flush water tank 18a bottom surface 24 drain valve device 32 drain port 42 valve body 48 float 441 base 442 column portion 444 upper surface 445 lower surface 446 rib 447 notch 449 sealing surface 450 seal Member P Fixed position WL Water level

Claims (6)

a valve body disposed above a drain port formed in the bottom surface of a wash water tank in which cleansing water is stored and which moves vertically to open and close the drain port;
a float that lowers the valve body in conjunction with a decrease in the water level in the wash water tank;
a pedestal disposed above the drain port and fixed to the bottom surface by fastening at a plurality of fixing positions in the vicinity of the drain port;
a plurality of pillars arranged at predetermined intervals on the outer peripheral portion of the valve body on the upper surface of the pedestal and guiding the movement of the valve body;
with
A drain valve device having a rib protruding downward on the periphery of the lower surface of the pedestal, the rib being formed with a notch. 2. The drain valve device according to claim 1, wherein said notch portion is formed avoiding said fixed position. 3. The drain valve device according to claim 1, wherein said pedestal has a sealing surface formed by an annular sealing member inside said rib on the peripheral edge of said lower surface. The drain valve device according to any one of claims 1 to 3, wherein the wash water tank is made of ceramics. A drain valve device according to any one of claims 1 to 4;
the wash water tank to which the drain valve device is attached;
A wash water tank arrangement comprising: a washing water tank device according to claim 5;
a toilet body to which flush water is supplied from the flush water tank;
A flush toilet.

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