JP7205795B2 - drain valve device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain valve device, and more particularly, to a drain valve device of the type provided with a drain port mounting portion that is watertightly attached to a drain port and provides a valve seat on which a valve body is seated.

Conventionally, as a drain valve device for a flush water tank that stores flush water for flushing a toilet bowl body, for example, as disclosed in Patent Document 1 and Patent Document 2, a drain port provided in the flush water tank is opened and closed. and a drain port mounting portion that is watertightly attached to the drain port and provides a valve seat on which the valve disc closes the drain port. there is

FIG. 5 shows a configuration corresponding to the drain valve device disclosed in Patent Document 1. As shown in FIG. FIG. 5 is a cross-sectional view of a conventional drain valve device (Patent Document 1).

In the drain valve device shown in FIG. 5, the drain port mounting portion 114 provides a valve seat 126 on which the valve body 138 is seated. It has a collar portion 130 projecting outward on the upper side, and an abutting portion 131 hanging down on the outer edge of the collar portion 130 .

The lower surface of the abutting portion 131 is adapted to abut against the bottom surface 106a of the wash water tank. Further, a sealing member 132 is provided for water-tightly sealing between the bottom surface 106a of the wash water tank and the collar portion 130. As shown in FIG.

In such a drain valve device, the sealing member 132 ensures watertight attachment between the bottom surface 106a of the wash water tank and the drain port attachment portion 114. As shown in FIG. Moreover, since it is the structure which has the abutment part 131, it can suppress that the variation in the tightening amount (tightening allowance) of the sealing member 132 arises.

Next, FIG. 6 shows a configuration corresponding to the drain valve device disclosed in Patent Document 2. As shown in FIG. FIG. 6 is a cross-sectional view of another conventional (Patent Document 2) drain valve device.

Also in the drain valve device shown in FIG. and a brim portion 230 projecting outward on the upper side.

In the drain valve device shown in FIG. 6, the outer edge of the brim portion 230 is not provided with an abutting portion that hangs downward. On the other hand, a male threaded portion 224m is provided on the cylindrical portion 224, and a tightening member 228 having a female threaded portion 228f is tightened from below the flushing water tank, so that the bottom surface 206a of the flushing water tank and the collar portion 230 are fastened together. The tightening amount (tightening margin) of the seal member 232 between is secured.

For example, by managing the tightening torque of the tightening member 228, it is possible to suppress variations in the amount of tightening (tightening margin) of the seal member 232 from occurring. However, the management of the tightening torque, which is unnecessary in the case of the structure having the abutting portion, may be troublesome for the user.

JP 2016-180245 A JP 2013-204268 A

By the way, it has been reported that the structure shown in FIG. The inventors of the present invention conducted extensive studies to find out the cause of the problem, and found that one of the factors was that wash water tanks are generally made of ceramics.

In the current washing water tank, the amount of deformation of the pottery is suppressed to be small in the vicinity of the opening edge of the drain port 106b. However, the inventors have found that the pottery may "wavy" away from the opening edge, and that the bottom surface 106a of the wash water tank may not be flat. Since the bottom surface 106a of the wash water tank is not flat, the abutment portion 131 abutting thereon and the flange portion 130 supporting the abutment portion 131 are subjected to stress concentration exceeding the allowable design value, resulting in deformation or deformation thereof. Damage will occur.

Furthermore, the inventors of the present invention have found that one of the factors is that the load on the cylindrical portion 124 is increased by the "lever principle" at the abutment portion 131 away from the cylindrical portion 124 and exerts an influence.

The present invention has been made based on the above findings. SUMMARY OF THE INVENTION An object of the present invention is to provide a drain valve device of a type having a drain port mounting portion that is watertightly attached to the drain port and provides a valve seat on which a valve body is seated, and which is less prone to deformation or breakage. is to provide

The present invention is a drain valve device for a flush water tank that stores flush water for flushing a toilet bowl body, comprising: a valve body for opening and closing a drain port provided in the flush water tank; a drain port mounting portion that is attached to the drain port and provides a valve seat on which the valve body closes the drain port, wherein the drain port mounting portion is a cylindrical portion that is inserted into the drain port; abutting portion protruding outward from a side surface of the tubular portion adjacent to the upper side of the tubular portion; The lower surface of the abutting portion abuts against the bottom surface of the flushing water tank, and the bottom surface of the flushing water tank and the drain port mounting portion are provided outside the abutting portion. The drain valve device is characterized in that a seal member is provided for water-tightly sealing the gap with the flange.

According to the present invention, the lower surface of the abutment abuts against the bottom surface of the wash water tank at a position closer to the opening edge of the drain port. Also, the occurrence of stress concentration exceeding the design allowable value at the abutting portion is suppressed. This suppresses deformation or breakage of the abutting portion.

Further, according to the present invention, since the cylindrical portion and the abutting portion are adjacent to each other, the load on the cylindrical portion is not increased by the "lever principle" and affects the abutting portion. This also prevents the abutment from being deformed or damaged.

Further, according to the present invention, since the portion corresponding to the base of the cylindrical portion is thickened by the abutment portion, it is possible to significantly suppress the possibility of damage such as breaking (or cracking) of the cylindrical portion at the base. can.

Furthermore, according to the present invention, since the abutment portion is employed, it is possible to always secure a suitable tightening amount (tightening margin) of the seal member without requiring tightening torque management. can.

For example, the tubular portion may be formed with a male screw portion. In this case, by tightening a tightening member (a member such as a nut) having a female thread from the lower side of the wash water tank, it is easy to fix the drain port mounting portion to the wash water tank. However, in the configuration of the present invention, since the abutment portion is employed, the tightening force of the tightening member does not substantially affect the tightening amount (tightening allowance) of the seal member.

In this case, for example, the male screw portion may have a length of 4 pitches or more. Even with such a cylindrical portion having a long male screw portion, since the portion corresponding to the base of the cylindrical portion is thickened by the abutting portion, there is a possibility that the cylindrical portion will break (or crack) at the base. can be kept small.

In order to achieve the effects of the present invention, the height of the abutment is preferably 5 to 10 mm, and/or when the drainage port is cylindrical, the height of the abutment is The dimensions are preferably in the range of 1/20 to 1/10 of the inner diameter of the mouth.

In order to obtain the effect of the present invention, it is preferable that the projecting length of the abutting portion to the outside with respect to the cylindrical portion is 5 to 10 mm, and/or when the drain port is cylindrical, It is preferable that the projecting length of the abutting portion to the outside with respect to the cylindrical portion is within the range of 1/20 to 1/10 of the inner diameter of the drain port.

According to the present invention, the lower surface of the abutment abuts against the bottom surface of the wash water tank at a position closer to the opening edge of the drain port. Also, the occurrence of stress concentration exceeding the design allowable value at the abutting portion is suppressed. This suppresses deformation or breakage of the abutting portion. Further, according to the present invention, the cylindrical portion and the abutting portion are adjacent to each other, and the load on the cylindrical portion is increased by the "principle of leverage" and does not affect the abutting portion. The occurrence of deformation or breakage of the contact portion is suppressed. Further, according to the present invention, since the portion corresponding to the base of the cylindrical portion is thickened by the abutment portion, it is possible to significantly suppress the possibility of damage such as breaking (or cracking) of the cylindrical portion at the base. can. Furthermore, according to the present invention, since the abutment portion is employed, it is possible to always secure a suitable tightening amount (tightening margin) of the seal member without requiring tightening torque management. can.

1 is a schematic diagram showing a flush toilet provided with a flush water tank device to which a drain valve device according to an embodiment of the present invention is applied; FIG. FIG. 2 is a cross-sectional perspective view taken along line II-II of FIG. 1; 1 is a plan view of a drain valve device according to one embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3 (however, illustration of a cylinder is omitted); It is a cross-sectional view of a conventional drain valve device (corresponding to Patent Document 1). FIG. 11 is a cross-sectional view of another conventional drain valve device (corresponding to Patent Document 2).

A drain valve device 8 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a flush toilet 1 equipped with a flush water tank device 4 to which a drain valve device 8 according to an embodiment of the present invention is applied, and FIG. 2 is taken along line II-II in FIG. 1 is a cross-sectional view along FIG.

As shown in FIG. 1, a flush toilet 1 equipped with a flush water tank device 4 to which a drain valve device 8 according to the present embodiment is applied consists of a toilet bowl body 2 that receives waste and an upper surface on the rear side of the toilet bowl body 2. and a rectangular parallelepiped washing water tank device 4 arranged in the .

A large washing button 4a and a small washing button 4b are attached to the washing water tank device 4 as operating bodies. The large wash button 4a and the small wash button 4b are exposed to the outside on the upper surface of the wash water tank device 4 (the upper surface of the wash water tank 6), and are operated by an external operating force (usually a manual pressing force). is received and translated downward over a predetermined stroke.

As shown in FIG. 2, the wash water tank device 4 includes a wash water tank 6 and a drain valve device 8 according to one embodiment of the present invention attached to a drain port 6b formed in the bottom surface 6a of the wash water tank 6. and a water supply device 10 placed on the bottom surface 6 a of the washing water tank 6 to supply washing water into the washing water tank 6 .

Further, the drain valve device 8 has an overflow pipe 12, and when the wash water in the wash water tank 6 exceeds a specified water level corresponding to the upper end position of the overflow pipe 12, the downstream side of the drain valve device 8 ( It is designed to flow out to the downstream side of the valve body 38, which will be described later).

Further, referring also to FIGS. 3 and 4, the structure of the drain valve device 8 according to one embodiment of the present invention will be described. FIG. 3 is a plan view of a drain valve device 8 according to one embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.

As shown in FIGS. 2 to 4, the drain valve device 8 of the present embodiment includes a disk-shaped valve body 38 for opening and closing the drain port 6b provided in the wash water tank 6, and an inner wall of the wash water tank 6. and a housing part 18 which movably supports a main shaft member 34 fixed to the valve body 38 so that the valve body 38 can open and close the drain port 6b.

The housing portion 18 of the drain valve device 8 of the present embodiment includes a drain port mounting portion 14 that is watertightly attached to the cylindrical drain port 6b penetrating the bottom surface 6a of the wash water tank 6, and the drain port mounting portion 14 further. and a substantially cylindrical valve support portion 16 extending upward. The valve body support portion 16 is provided with a sliding cylinder portion 16 s that guides the vertical movement of the main shaft member 34 .

More specifically, the drain port mounting portion 14 includes a substantially cylindrical drain port mounting portion main body 22, a diameter-reduced portion 24a that decreases in diameter toward the inside and downward of the drain port mounting portion main body 22, and a reduced-diameter portion 24a. A drainage channel 24b extending further downward from the washing water tank 6 so as to penetrate the drainage port 6b, and a valve seat 26 formed in a substantially annular shape along the upper edge of the reduced diameter portion 24a and protruding upward. and have The reduced diameter portion 24a and the drainage channel 24b form the drainage channel forming portion 24. As shown in FIG.

In the drain port mounting portion 14 of the present embodiment, a portion corresponding to the drain channel 24b is a cylindrical portion 24c inserted into the drain port 6b, and adjacent to the upper side of the cylindrical portion 24c and extending from the side surface of the cylindrical portion 24c. and an abutting portion 24d projecting outward. The lower surface of the abutting portion 24d is in contact with the bottom surface 6a of the washing water tank 6. As shown in FIG.

Further, a collar portion 30 is provided adjacent to the upper side of the abutment portion 24d and protrudes further outward than the abutment portion 24d. The collar portion 30 is positioned on the outer periphery below the diameter-reduced portion 24a. An annular packing 32 is sandwiched between the bottom surface 6 a of the wash water tank 6 and the bottom surface of the flange portion 30 . The ring-shaped packing 32 is positioned outside the abutting portion 24d so as to function as a sealing member for water-tightly sealing between the bottom surface 6a of the wash water tank 6 and the flange portion 30 of the drain port mounting portion 14. It's becoming

A male screw portion 24m is formed on the tubular portion 24c. The male screw portion 24m of this embodiment has a length of 4 pitches. A tightening member 28 (a nut-like member) having a female threaded portion 28f (having a length of two pitches in this embodiment) is attached to the male threaded portion 24m of the cylindrical portion 24c from the lower side of the wash water tank. By tightening, the drain port attachment portion 14 and the wash water tank 6 are easily fixed. However, since the abutting portion 24d is employed, the tightening force of the tightening member 28 does not substantially affect the amount of tightening (tightening margin) of the annular packing 32 .

A plurality of communication ports 36 are formed in the circumferential direction in a region above the valve seat 26 of the drain port attachment portion main body 22 . The opening cross section of each communication port 36 is formed in a rectangular shape in the side view shown in FIG.

A substantially cup-shaped tubular body 20 (see FIGS. 2 and 3) is attached to the outer peripheral surface of the drain port attachment portion main body 22 . Each communication port 36 communicates an area outside the drain port mounting portion main body 22 and an area inside the drain port mounting portion main body 22 inside the cylindrical body 20 . As a result, when the water level of the cleansing water in the cleansing water tank 6 is positioned above the upper edge of the cylindrical body 20, the cleansing water that has flowed into the cylindrical body 20 flows through the communication ports 36 into the drain port mounting portion main body 22. It is designed to flow inside.

Further, the reduced diameter portion 24a is provided with an overflow pipe connecting portion (not shown) that allows communication between the lower portion of the overflow pipe 12 and the inside of the drain port mounting portion 14 (downstream side of the valve element 38).

The disc-shaped valve body 38 can open and close the drain port 6b by moving the drain port mounting portion 14 up and down with respect to the valve seat 26 (moving between the abutting state and the separated state). The vertical movement of the valve body 38 is guided by the vertical movement of the main shaft member 34 that supports the valve body by the sliding cylindrical portion 16 s of the valve body support portion 16 .

The large wash button 4a and the small wash button 4b described above are operating bodies for activating the lifting operation of the valve body 38, and are constituent elements of the drain valve device 8 of the present embodiment. The drain valve device 8 of this embodiment includes a link mechanism 40 that changes its position and orientation in conjunction with the movement of the operation bodies 4a and 4b so as to pull up the valve body 38. As shown in FIG.

The link mechanism 40 of this embodiment includes a first lift member 41 that pulls up the valve body 38 (main shaft member 34) from the closed position to the intermediate lifting position in conjunction with the first half stroke of the movement stroke of the operating body 4a, and the operating body 4a. and a second lift member 42 that pulls up the valve body 38 (main shaft member 34) further upward from the intermediate lifted position in conjunction with the second half stroke of the movement stroke.

Further, the link mechanism 40 of this embodiment further has a rotating arm 44 that rotates around a rotating shaft 43 provided inside the wash water tank 6 . A contact portion 45 that contacts the operating body 4a is provided on one side of the rotating arm 44 with respect to the rotating shaft 43 (left side in FIG. 4), and the other side of the rotating arm 44 with respect to the rotating shaft 43 (left side in FIG. 4) is provided. On the right side), the upper end portions of the first lift member 41 and the second lift member 42 are swingably supported (rotated).

In this embodiment, the position P1 at which the rotating arm 44 swingably supports the upper end of the first lift member 41 is the position at which the rotating arm 44 swingably supports the upper end of the second lift member 42. It is closer to the rotation shaft 43 than P2.

Further, in the present embodiment, in a cross section perpendicular to the axis of the rotating shaft 43, a straight line connecting the position P1 where the rotating arm 44 supports the first lift member 41 and the rotating shaft 43 is the rotating arm 44. forms an obtuse angle with a straight line connecting the position P1 where the arm supports the first lift member 41 and the position P2 where the pivot arm 44 supports the second lift member 42 .

As a result, when the position P1 at which the rotating arm 44 supports the first lift member 41 reaches above the rotating shaft 43 due to the rotation of the rotating arm 44, the rotating arm 44 moves toward the second lift member 42. is still below the pivot shaft 43 .

Further, in this embodiment, the lower end of the first lift member 41 lifts the valve body 38 via the main shaft member 34 (provides lifting force to the valve body 34). Specifically, the lower end of the first lift member 41 has a cylindrical contact surface in the front direction and the back direction (parallel to the axis of the rotation shaft 43) perpendicular to the plane of FIG. A first engaging portion 41e provided on the upper surface side extends (the entire first lift member 41 has a substantially inverted T shape), and the main shaft member 34 interferes with the first engaging portion 41e. Similarly, a first interference portion 51 extending in the front direction and the back direction (parallel to the axis of the rotation shaft 43) perpendicular to the plane of FIG. 4 is provided. On the lower surface side of the first interference portion 51, a concave cylindrical contact surface 51a extending in the front direction and the back direction (parallel to the axis of the rotation shaft 43) perpendicular to the paper surface of FIG. 4 is provided. The radius of curvature of the contact surface 51a is larger than the radius of curvature of the contact surface of the cylindrical first engaging portion 41e. With the above configuration, the first engaging portion 41e of the first lift member 41 lifts up the main shaft member 34 (and thus the valve body 38) via the first interference portion 51. As shown in FIG.

As is clear from FIG. 4, the lower end of the first lift member 41 is positioned at the center of the valve body 38 in plan view. That is, the position where the first lift member 41 acts on the valve body 38 via the main shaft member 34 to lift the valve body 38 (provides a lifting force) is at the center of the valve body 38 in plan view.

On the other hand, in the present embodiment, the lower end of the second lift member 42 also lifts the valve body 38 via the main shaft member 34 (provides a lifting force to the valve body 34). Specifically, the lower end of the second lift member 42 also has a cylindrical contact surface in the front direction and the back direction (parallel to the axis of the rotation shaft 43) perpendicular to the plane of FIG. A second engaging portion 42e provided on the upper surface side extends (the entire second lift member 42 also has a substantially inverted T shape, but is shorter than the first lift member 41), and the main shaft member 34 has: Similarly, a second interference portion 52 extending in the front direction and the back direction perpendicular to the paper surface of FIG. 4 (parallel to the axis of the rotation shaft 43) is provided so as to interfere with the second engagement portion 42e. ing. On the lower surface side of the second interference portion 52, a concave cylindrical contact surface 52a extending in the front direction and the back direction (parallel to the axis of the rotation shaft 43) perpendicular to the paper surface of FIG. 4 is provided. The radius of curvature of the contact surface 52a is larger than the radius of curvature of the contact surface of the cylindrical second engaging portion 42e. With the configuration as described above, the second engaging portion 42 e of the second lift member 42 lifts up the main shaft member 34 (and thus the valve body 38 ) via the second interference portion 52 .

As is clear from FIG. 4, the lower end of the second lift member 42 is positioned off the center position of the valve body 38 in plan view. That is, the position where the second lift member 42 acts on the valve body 38 via the main shaft member 34 to lift the valve body 38 (provides a lifting force) is a position off the center of the valve body 38 in plan view. It is in.

Next, the operation of the drain valve device 8 according to this embodiment will be described.

First, when the user presses the large wash button 4 a (operating body), the large wash button 4 a moves downward into the wash water tank 6 . Along with this movement, the link mechanism 40 is actuated and the valve body 38 is pulled up via the main shaft member 34 .

Specifically, the contact portion 45 of the rotating arm 44 is moved downward as the large wash button 4a is moved. As a result, the rotating arm 44 rotates around the rotating shaft 43 .

At the beginning of the movement stroke of the large wash button 4 a , the contact position between the large wash button 4 a and the contact portion 45 is relatively close to the rotation shaft 43 . Therefore, the pressing force can be used as a relatively large turning force due to the principle of leverage. Also, in the first half stroke of the movement stroke of the operating body 4a, the lower end of the first lift member 41 lifts the valve body 38 via the main shaft member 34 at the center of the valve body 38 in plan view. With these features, a smooth lifting operation of the valve body 38 can be realized, even though a lifting force that overcomes the water pressure is required to lift the valve body 38 from the closed position.

By pulling up the valve body 38 and separating it from the valve seat 26, the diameter-reduced portion 24a and the drainage passage 24b of the drainage passage forming portion 24 are communicated with the interior of the drainage port mounting portion main body 22, and the drainage port 6b is opened. Take. As a result, the wash water in the wash water tank 6 flows into the cylindrical body 20 and further flows into the drain port mounting portion main body 22 via the communication port 36 to It is discharged to the toilet body 2 through the drainage channel 24b.

The contact position between the large wash button 4a and the contact portion 45 is relatively far from the rotation shaft 43 in the middle of the movement stroke of the large wash button 4a (part of the first half stroke), and the pressing force is relatively large. Can be used as a stroke. As a result, a smooth reaction force transition can be obtained, and the operation is comfortable.

In a cross section perpendicular to the axis of the rotating shaft 43, if the straight line connecting the axis of the rotating shaft 34 and the position P1 where the rotating arm 44 supports the first lift member 41 exceeds around 30° with respect to the horizontal plane. Since the position P1 (first lift member) is not effectively raised by the subsequent rotation of the rotary arm 44, the first lift member 41 cannot effectively gain an upward stroke. On the other hand, the position P<b>2 where the rotating arm 44 supports the second lift member 42 is still below the rotating shaft 43 . Therefore, in order to utilize the elevation of the position P2 accompanying the rotation of the rotating arm 44, lifting of the valve body using the second lift member 42 is started (second half stroke of the stroke of movement of the operating body 4a).

Both the position P1 and the position P2 are further raised as the rotary arm 44 is rotated. Although the degree of each inclination also has an effect, it is usually negligible including the example of this embodiment), the lifting speed by the second lift member 42 exceeds the lifting speed by the first lift member 41, The previous lifting operation by the first lift member 41 is smoothly succeeded to the lifting operation by the second lift member 42 .

Thereby, a desired stroke can be secured. In the latter half of the stroke, the lower end of the second lift member 42 lifts the valve body 38 via the main shaft member 34 at a position off the center of the valve body 38 in plan view, but lifts the valve body 38 from the closed position. Unlike the case, the force (such as water pressure) that resists the pull-up force is small, so the smooth pull-up operation of the valve body 38 can be continued.

In addition, the contact position between the large wash button 4a and the contact portion 45 becomes relatively close to the rotation shaft 43 again at the end of the movement stroke (second half stroke) of the large wash button 4a, and the pressing force is compared again. It can be used as a significant turning force. As a result, a smooth reaction force transition can be obtained, and the operation is comfortable.

When the small wash button 4b is pressed instead of the large wash button 4a, for example, only the stroke corresponding to the first half stroke can be used.

According to the drain valve device 8 of the present embodiment as described above, the lower surface of the abutting portion 24d contacts the bottom surface 6a of the wash water tank 6 at a position closer to the opening edge of the drain port 6b. is made of ceramic and has "undulations", stress concentration exceeding the design allowable value is suppressed from occurring in the abutting portion 24d. This suppresses deformation or breakage of the abutting portion 24d.

Further, according to the drain valve device 8 of the present embodiment, since the tubular portion 24c and the abutment portion 24d are adjacent to each other, the load on the tubular portion 24c is increased by the "principle of leverage" and the abutment portion 24d is loaded. have no effect. This also prevents the abutment from being deformed or damaged.

Further, according to the drain valve device 8 of the present embodiment, since the portion corresponding to the root of the cylindrical portion 24c is thickened by the abutting portion 24d, the cylindrical portion 24c can be broken (or cracked) at the root. It is also possible to significantly suppress the sexuality.

Further, according to the drain valve device 8 of the present embodiment, since the abutting portion 24d is employed, there is no need to manage the tightening torque, etc., and the amount of tightening of the annular packing 32 ( tightening allowance) can always be secured.

Further, according to the drain valve device 8 of the present embodiment, the cylindrical portion 24c is formed with the male screw portion 24m, and by tightening the tightening member 28 having the female screw portion 28f from the lower side of the wash water tank 6, the , it is easy to fix the drain port mounting portion 14 to the washing water tank 6 . (However, since the abutting portion 24d is employed, the tightening force of the tightening member 28 does not substantially affect the tightening amount (tightening allowance) of the annular packing 32.)

The male screw portion 24m may have a length of 4 pitches or more. Even with the cylindrical portion 24c having such a long male threaded portion 24m, the portion corresponding to the base of the cylindrical portion 24c is thickened by the abutment portion 24d, so the cylindrical portion 24c is broken (or cracked) at the base. The possibility of breakage can be kept small.

As an example of suitable dimensions, when the drain port 6b is cylindrical with a diameter of φ80.2, the outer edge of the abutting portion 24d is The protruding length (radius difference) of 24d is (94−80.2)/2=6.9 mm), the outer edge of the annular packing 32 is φ107.4, and the height of the abutting portion 24d is 7 mm. .

In order to achieve the effect of the present invention, the height of the abutting portion 24d is preferably 5 to 10 mm, and/or when the drainage port 6b is cylindrical, the height of the abutting portion 24d is is preferably in the range of 1/20 to 1/10 of the inner diameter of the drain port 6b.

In order to obtain the effect of the present invention, it is preferable that the projecting length of the abutting portion 24d to the outside with respect to the cylindrical portion 24c is 5 to 10 mm, and/or when the drain port 6b is cylindrical. In particular, the radially outward projection length (radius difference) of the abutting portion 24d with respect to the cylindrical portion 24c is preferably within the range of 1/20 to 1/10 of the inner diameter of the drain port 6b.

1 flush toilet bowl 2 toilet bowl body 4 flush water tank device 4a large flush button (operator)
4b Small wash button (operator)
6 Washing water tank 6a Bottom surface 6b Drain port 8 Drain valve device 10 Water supply device 12 Overflow pipe 14 Drain port mounting portion 16 Valve body support portion 20 Cylindrical body 22 Drain port mounting portion main body 24 Drain passage forming portion 24 a Diameter reduction portion 24 b Drain passage 24c cylindrical portion 24m male screw portion 24d abutment portion 26 valve seat 28 tightening member 28f female screw portion 30 collar portion 32 packing 34 main shaft member 36 communication port 38 valve body 40 link mechanism 41 first lift member 41e first engaging portion 42 second lift member 42e second engaging portion 43 rotating shaft 44 rotating arm 45 contact portion 51 first interference portion 51a contact surface 52 second interference portion 52a contact surface P1 of the first lift member in the rotating arm Support position P2 of the upper end Support position 114 of the upper end of the second lift member in the rotating arm Drain port mounting portion 124 Cylinder portion 126 Valve seat 130 Collar portion 131 Abutment portion 132 Seal member 138 Valve body 106a Bottom surface 106b Drain port 214 Drain port Mounting portion 224 Cylinder portion 224m Male screw portion 226 Valve seat 228 Tightening member 228f Female screw portion 230 Collar portion 232 Sealing member 238 Valve body 206a Bottom surface 206b Drain port

Claims (6)

A drain valve device for a flush water tank for storing flush water for flushing a toilet body,
a valve body for opening and closing a drain port provided in the wash water tank;
a drain fitting that is watertightly attached to the drain and provides a valve seat upon which the valve body closes the drain;
with
The drain port mounting portion is
a cylindrical portion adapted to be inserted into the drain port and formed with a male screw ;
an abutting portion protruding outward from a side surface of the tubular portion adjacent to the upper side of the tubular portion;
a collar portion projecting further outward than the abutting portion on the upper side of the abutting portion;
and
the lower surface of the abutting portion is arranged so as to be able to directly abut against the bottom surface of the wash water tank;
A sealing member is provided outside the abutting portion for water-tightly sealing between the bottom surface of the wash water tank and the flange portion of the drain port mounting portion ,
A tightening member having a female screw portion that engages with the male screw portion of the cylindrical portion and is adapted to be tightened upward is provided on the lower side of the wash water tank,
The tightening member is tightened by a tightening amount such that the lower surface of the abutting portion and the bottom surface of the flush water tank are in direct contact with each other.
A drain valve device characterized by: 2. The drain valve device according to claim 1 , wherein the male screw portion has a length of 4 pitches or more. 3. The drain valve device according to claim 1, wherein the abutment has a height of 5 to 10 mm. the outlet is cylindrical,
4. The drain valve device according to any one of claims 1 to 3 , wherein the height of the abutting portion is within a range of 1/20 to 1/10 of the inner diameter of the drain port. 5. The drain valve device according to claim 1 , wherein the projecting length of the abutting portion to the outside of the cylindrical portion is 5 to 10 mm. the outlet is cylindrical,
6. Any one of claims 1 to 5 , wherein the projecting length of the abutting portion to the outside with respect to the cylindrical portion is a dimension in the range of 1/20 to 1/10 of the inner diameter of the drain port. A drain valve device as described.

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