JP6788213B2 - Drain valve device, flush water tank device and flush toilet - Google Patents

Description

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

Conventionally, a flush toilet has been known in which the main body of the toilet is washed with the washing water stored in the water storage tank device. A drain valve device is used in this water storage tank device. As an example of this drain valve device, the drain port is opened and closed by moving the valve body vertically with respect to the drain port in the washing water tank. A drain valve device is used. As such a drain valve device, one in which a float that exerts buoyancy on the valve body is integrally formed with the valve body is known (for example, see Patent Document 1).

In this conventional drain valve device, the valve body descends in the vertical direction in conjunction with the decrease in the water level in the wash water tank due to the buoyancy of the float, so that the opening time of the drain port by the valve body can be kept almost constant. Therefore, the water level after the end of drainage (hereinafter referred to as "dead water level") can be stably determined. The amount of wash water drained from the full water level to the dead water level in one drainage operation in the water storage tank device is the amount of wash water supplied to the toilet bowl body.

U.S. Pat. No. 8079095

In such a conventional drain valve device, in order to increase the amount of washing water supplied to the toilet bowl body, it may be required to set the height of the dead water level to a position lower than the initially set dead water level. ..
However, simply increasing the size of the float to increase the buoyancy does not cause buoyancy in the float above the water level of the wash water, so the height of the dead water level cannot be further lowered. There are challenges. In addition, since the flow of drainage is likely to be obstructed by increasing the size of the float, there has been a problem that the instantaneous flow rate of the drained washing water is reduced.

Furthermore, in order to solve the problems of setting the dead water level and lowering the instantaneous flow rate, it is usually necessary to make fundamental design improvements such as changing the size of the drain valve device and the size of the water storage tank. There is a problem that the improvement cannot be easily performed and it is not economical.
Therefore, the height of the dead water level can be set even lower relatively easily without making major design improvements such as replacing the drain valve device or the water storage tank or increasing the size of the drain valve device. There has been a demand for a drain valve device capable of suppressing a decrease in the instantaneous flow rate of the drained washing water.

The present invention has been made in order to satisfy the conventional demands, and it is possible to increase the flow rate of the washing water to be drained from the full water level to the dead water level in the drainage operation of the water storage tank device, and further, the water is drained. A drain valve device that can suppress a decrease in the instantaneous flow rate of wash water and enhance the cleaning ability of the toilet bowl body with the wash water drained from the drain valve device, and a water storage tank device equipped with this drain valve device. Furthermore, it is an object of the present invention to provide a flush toilet equipped with this water storage tank device.

In order to achieve the above object, the present invention is a direct acting drain valve device attached to a water storage tank of a water storage tank device for storing wash water, and is above a drain port provided on the bottom surface of the water storage tank. A valve body that is attached to the water tank and moves up and down in the vertical direction to open and close the drainage port, a float that is attached to this valve body and lowers the valve body in conjunction with a drop in the water level in the water storage tank, and the inside of the valve body. It has a valve body lower float extension part for adding a float by being provided on the side and protruding downward from the valve body, and the valve body lower float extension part is at least one of the outer peripheral parts on the lower side. The valve body forms an inclined surface in which the portion is inclined inward from the outer edge of the outer peripheral portion, and even for the drainage amount set to be smaller of the drainage amounts from the drain ports set in a plurality of stages. Further, the float extension portion below the valve body is formed so as to be pulled up above the valve seat at the start of drainage .
According to the present invention configured as described above, the valve body lower float extension portion for adding the float is provided so as to project inward of the valve body and downward of the valve body, whereby the valve body lower float is provided. Since the extension part receives buoyancy and the timing at which the valve body closes the drain port can be delayed, more washing water in the water storage tank is drained before the valve body closes the drain port, and when draining, It is possible to achieve a low dead water level in the water storage tank. At this time, the valve body lower float extension portion forms an inclined surface in which at least a part of the lower outer peripheral portion protruding downward from the valve body is inclined inward. It is possible to prevent the washing water from colliding with the outer peripheral portion on the lower side of the float extension portion below the valve body, and to prevent the instantaneous flow rate of the washing water from decreasing. Therefore, it is possible to increase the flow rate of the flush water drained from the full water level to the dead water level in the drainage operation of the water storage tank device without changing the size of the drain valve device or the size of the water storage tank. It is possible to suppress a decrease in the instantaneous flow rate of the washing water to be performed, and to enhance the cleaning ability of the toilet bowl body by the washing water drained from the drain valve device.

In the present invention, preferably, the valve body lower float extension portion is formed so that the cross-sectional area of the horizontal cross section decreases downward.
According to the present invention configured in this way, the valve body lower float extension portion is formed so that the cross-sectional area of the horizontal cross section decreases downward, so that the washing water is added to the valve body lower float extension during drainage. It is possible to suppress the collision with the outer peripheral portion on the lower side of the portion and suppress the decrease in the instantaneous flow rate of the washing water. Therefore, even if the size of the drain valve device or the size of the water storage tank is not changed, the flow rate of the washing water drained from the full water level to the dead water level in the draining operation of the water storage tank device can be increased, and further, the washing can be performed. It is possible to suppress a decrease in the instantaneous flow rate of water and enhance the cleaning ability of the toilet bowl body by the washing water drained from the drain valve device.

The water storage tank device of the present invention includes the drain valve device described above.
According to the present invention configured in this way, since the water storage tank device includes the drain valve device, similarly, the flow rate of the washing water drained from the full water level to the dead water level in the drainage operation of the water storage tank device can be adjusted. It can be increased, and it is possible to suppress a decrease in the instantaneous flow rate of the drained wash water.

The flush toilet of the present invention includes the above-mentioned water storage tank device.
According to the present invention configured as described above, since the flush toilet is provided with the water storage tank device described above, the flow rate of the wash water drained from the full water level to the dead water level in the drainage operation of the water storage tank device is increased. Further, it is possible to suppress a decrease in the instantaneous flow rate of the drained washing water.

According to the drain valve device, the water storage tank device, and the flush toilet of the present invention, it is possible to increase the flow rate of the flush water drained from the full water level to the dead water level in the drainage operation from the water storage tank device, and further. It is possible to suppress a decrease in the instantaneous flow rate of the drained wash water and enhance the cleaning ability of the toilet bowl body by the wash water drained from the drain valve device.

It is a side sectional view which shows the flush toilet by one Embodiment of this invention. It is sectional drawing seen along the line AA of FIG. It is a perspective view of the drain valve device by one Embodiment of this invention. It is a perspective view which shows the pedestal and the overflow pipe of the drain valve device by one Embodiment of this invention. It is sectional drawing which shows the pedestal and overflow pipe of the drainage valve device by one Embodiment of this invention. It is a perspective view which shows the appearance of the valve body, the float, and the descent start timing adjustment mechanism of the drain valve device according to one embodiment of the present invention viewed from diagonally above. It is a perspective view which shows the valve body, the float, the valve body lower float extension part, and the lowering start timing adjustment mechanism of the drainage valve device by one Embodiment of this invention seen from diagonally lower side. It is sectional drawing which shows the valve body, the float, the valve body lower float extension part, and the descent start timing adjustment mechanism of the drainage valve device by one Embodiment of this invention. It is a perspective view which shows the guide part which guides the valve body of the drainage valve device by one Embodiment of this invention. It is a perspective view which shows the immediate wall of the water storage part of the descent start timing start mechanism of the drainage valve device by one Embodiment of this invention. It is a perspective view which shows the state which looked at the valve body lower float extension part of the drainage valve device by one Embodiment of this invention from diagonally above. It is a perspective view which shows the state which looked at the valve body lower float extension part of the drainage valve device by one Embodiment of this invention from diagonally below. It is a central sectional view of the modification of the valve body lower float extension part of the drain valve device by one Embodiment of this invention. It is sectional drawing which shows the state before the start of drainage of the drainage valve device by one Embodiment of this invention. It is sectional drawing which shows the state in the middle of drainage of the drainage valve device by one Embodiment of this invention. FIG. 5 is a cross-sectional view showing a state immediately after the valve body closes the drain port and drainage is completed in the drain valve device according to the embodiment of the present invention.

Hereinafter, the drain valve device, the water storage water tank device, and the flush toilet according to the embodiment of the present invention will be described with reference to the accompanying drawings.

The drain valve device, the washing water tank device, and the flush toilet according to the embodiment of the present invention according to FIGS. 1 and 2 will be described. First, a flush toilet according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a side sectional view showing a flush toilet according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

As shown in FIG. 1, the flush toilet bowl 1 according to the embodiment of the present invention is installed on the toilet bowl body 2 installed on the floor surface of the toilet room and on the rear upper part of the toilet bowl body 2, and is mounted on the toilet bowl body 2. It is provided with a water storage tank device 4 for storing the supplied wash water.

The toilet body 2 has a bowl portion 6 that receives filth, a water conduit 8 that guides the washing water supplied from the water storage tank device 4 to the bowl portion 6, and an inlet thereof connected to the lower portion of the bowl portion 6, and the inside of the bowl portion 6 is connected. It is provided with a drain trap pipeline 10 for discharging the filth from the outside to an external drain pipe (not shown).

The bowl portion 6 is provided on the left side side of the rim portion 12 overhanging inward at the upper edge portion and the toilet bowl of the rim portion 12, and discharges the washing water supplied from the headrace 8 to the front of the toilet bowl. It is provided with a 1 water spout 7 and a second spout 16 provided on the left side of the toilet bowl above the water reservoir surface and laterally discharges the washing water supplied from the headrace 8.

The drain trap pipeline 10 includes an ascending path portion extending upward from the inlet thereof and a descending path portion extending downward from the end of the ascending path portion and connected to an external drainage pipe (not shown). Washing water for forming a water-sealed state is stored from the bowl portion 6 to the ascending passage portion of the drain trap pipeline 10. The stored wash water is called "reservoir water", and the water surface of the pooled water is the pooled water surface.

The flush toilet 1 is a so-called flush toilet type in which filth is washed away by the running water action due to the drop of the washing water in the bowl portion 6. In the flush toilet 1, the washing water spouted forward from the first spout 7 descends while swirling to wash the bowl portion 6, and further, the washing water spouted from the second spout 16 is in the vertical direction. The filth is agitated and pushed out to the drain trap line 10. The present invention is not limited to this wash-off type, and may be another type of flush toilet such as a siphon type.

Next, the washing water tank device will be described with reference to FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 2, the water storage tank device 4 includes a water storage tank 18 for storing wash water, a lid 20 of the water storage tank 18, a water supply device 22 provided in the water storage tank 18, and a drain valve device 24. To be equipped.

As shown in FIG. 2, the water storage tank 18 is, for example, a container made of earthenware and having a substantially rectangular shape with an open top. Also, the upper opening is usually closed by, for example, a pottery lid 20 (see FIG. 1). In FIG. 2, the lid portion 20 is not shown.

A lever handle 26 is provided on the outer surface of the water storage tank 18. The lever handle 26 rotates about the axis of its base 26a. Further, a substantially L-shaped spindle 28 extending substantially horizontally into the water storage tank 18 and having the tip end bent downward is coaxially connected to the lever handle 26 with the rotation shaft of the lever handle 26. The spindle 28 is adapted to rotate toward the front side and the back side in the drawing by the rotation operation of the lever handle 26.

The tip of the spindle 28 is located substantially directly above the drain valve device 24. Further, one end of the ball chain 30, which is 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 described later in the drain valve device 24.

A drainage port 32 that opens in a circular shape is formed on the bottom surface of the water storage tank 18, and the drainage port 32 communicates with the headrace 8 (see FIG. 1) to supply wash water to the headrace 8. ing. The drain port 32 is opened and closed by the drain valve device 24.

As shown in FIG. 2, a water supply device 22 is provided in the water storage tank 18. 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 a water supply source (not shown) outside the water storage tank 18 and extends upward from the bottom surface of the water storage tank 18. Further, at the lower part of the water supply pipe 34, a water supply port 34a for supplying wash water into the water storage tank 18 is provided.

Further, a diaphragm type water supply valve (not shown) is provided on the upper part of the water supply pipe 34, and the water supply valve can supply and stop the washing water supplied from the water supply pipe 34 into the water storage tank 18. Is to be switched.

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

The water supply float 38 is connected to a water supply valve (not shown) via a rocking body 40, and opens and closes the water supply valve by vertical movement. Specifically, since the washing water stored in the small tank 36 is drained from the opening (not shown) formed on the lower surface of the water supply float 38, it is linked to the decrease in the water level in the small tank 36. Descend. Then, the water supply valve is opened by lowering the water supply float 38, and the washing water is supplied from the water supply port 34a into the water storage tank 18.

Next, the drain valve device 24 will be described with reference to FIGS. 2 to 8.
FIG. 3 is a perspective view of the drain valve device according to the embodiment of the present invention, FIG. 4 is a perspective view showing a pedestal and an overflow pipe of the drain valve device according to the embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view showing a pedestal and an overflow pipe of the drain valve device according to the embodiment of the present invention, and FIG. 6 is an obliquely upward view of the valve body, the float, and the lowering start timing adjusting mechanism of the drain valve device according to the embodiment of the present invention. FIG. 7 is a perspective view showing the state viewed from the above, and FIG. 7 is a obliquely downward view of the valve body, float, valve body lower float extension portion, and lowering start timing adjusting mechanism of the drain valve device according to the embodiment of the present invention. FIG. 8 is a perspective view showing a state, and FIG. 8 is a cross-sectional view showing a valve body, a float, a valve body lower float extension portion, and a lowering start timing adjusting mechanism of the drain valve device according to the embodiment of the present invention.

The drain valve device 24 is a so-called direct-acting drain valve device that is arranged above the drain port 32 and the valve body 42 moves up and down in the vertical direction to open and close the drain port 32.

The drain valve device 24 includes a pedestal 44 and an overflow pipe 46. The pedestal 44 is arranged substantially directly above the drain port 32. The pedestal 44 includes a plurality of pillars 44a concentrically arranged with respect to the center of the drainage port 32 at predetermined intervals, and a cylindrical connection portion 44b provided at the lowermost portion is screwed with the drainage port 32. To do. Further, a drainage space 44c communicating with the drainage port 32 is formed in the lower part of the pedestal 44. The wash water passes through the drainage space 44c from the opening 44d between the pillar portion 44a and the pillar portion 44a, and then is drained from the drain port 32.

The overflow pipe 46 is provided integrally with the pedestal 44 on the side of the pedestal 44. The overflow pipe 46 is formed in a cylindrical shape, and the upper end opening faces upward. Further, the lower end opening of the overflow pipe 46 opens laterally substantially orthogonal to the upper end opening and communicates with the drainage space 44c. The overflow pipe 46 is provided to prevent the washing water from overflowing from the water storage tank 18, and when the water level in the water storage tank 18 exceeds the height of the upper end opening of the overflow pipe 46, the washing water overflows. It flows into the 46 and is drained to the drain port 32.

Further, the drain valve device 24 is attached to the valve body 42 which is attached above the drain port 32 provided on the bottom surface of the water storage tank 18 and moves in the vertical direction to open and close the drain port 32, and is attached to the valve body 42. The float 48 that lowers the valve body 42 in conjunction with the decrease in the water level in the water storage tank 18, the lowering start timing variable mechanism 50, and the valve body 42 so as to protrude inward and below the valve body 42. It is provided with a valve body lower float expansion portion for expanding the float 48 by being attached.

The valve body 42 is formed in a disk shape, and has a rubber seal portion 42a on the lower surface facing the drain port 32. Further, the valve body 42 is provided in the pedestal 44 so as to be vertically movable within a predetermined range, and at the lowest position of the movable range, the drain port 32 is closed by contacting the valve seat 43 provided on the pedestal 44. To do. The valve body 42 is formed in an annular shape so that a space is formed inside in the radial direction. The valve body 42 and the seal portion 42a form an annular seal surface.

The float 48 includes a cylindrical inner cylinder 48a whose upper end is closed and an outer cylinder 48b whose upper end is open to the outside of the inner cylinder 48a, and the lower ends of the inner cylinder 48a and the outer cylinder 48b are closed by the lower surface 48c. Further, the lower ends of the inner cylinder 48a and the outer cylinder 48b are connected to the valve body 42 and are provided integrally with the valve body 42. When the water level in the water storage tank 18 drops and reaches a predetermined height, the float 48 descends in conjunction with the subsequent drop in the water level. The inner cylinder 48a of the float 48 is formed so that the lower portion thereof is opened. The float 48 forms an internal space 49 inside the inner cylinder 48a. Therefore, the float 48 is formed so as to receive an upward buoyancy by the air stored in the internal space 49 of the float 48 in a state where the washing water is present in the surroundings. By forming the internal space 49 of the float 48 in the space having the volume C1, a buoyancy of a predetermined size is generated at the time of drainage, and the water level in the water storage tank 18 is lowered to a predetermined height. When it reaches, it descends in conjunction with the subsequent decrease in water level, so that it is formed so that drainage can be performed up to the dead water level DWL1 at a predetermined height.

The descent start timing variable mechanism 50 is a buoyancy adjusting mechanism for the float 48, and is provided in a region around and above the float 48. The descending start timing variable mechanism 50 changes the water level in the water storage tank 18 when the valve body 42 and the float 48 start descending in conjunction with the decrease in the water level in the water storage tank 18 with respect to the buoyancy generated by the float 48. It is for making (variable).

By arranging the descending start timing variable mechanism 50 on the float 48, the height of the float 48 from the drain port 32 can be made constant, and the water level at which the valve body 42 and the float 48 start descending can be changed. ..

Next, the specific structure of the descending start timing variable mechanism 50 will be described with reference to FIGS. 3 to 10. FIG. 9 is a perspective view showing a guide portion for guiding the valve body of the drain valve device according to the embodiment of the present invention, and FIG. 10 is a water storage portion of the lowering start timing start mechanism of the drain valve device according to the embodiment of the present invention. It is a perspective view which shows the immediate wall of.
Here, the dead water level (DWL1 to DWL3) refers to the water level of the washing water in the washing water tank when the discharge of the washing water is stopped (see FIG. 16). The dead water level at a low position is referred to as "low DWL", and the dead water level at a high position is referred to as "high DWL".

The descent start timing variable mechanism 50 includes a water storage unit 52 and an adjusting unit 54. The water storage portion 52 is formed in a region around and above the float 48. Specifically, the water storage unit 52 includes a donut-shaped container having an open upper portion formed by an inner cylinder 48a, an outer cylinder 48b, and a lower surface 48c of the float 48. Further, the water storage unit 52 includes a cylindrical side wall 56 having an upper end and a lower end that are inserted into the inner side of the outer cylinder 48b from above and fixed to the inside of the outer cylinder 48b. The side wall 56 is formed over the entire circumference, and can store washing water up to the upper edge of the side wall 56. In this way, the water storage unit 52 is formed by the inner cylinder 48a, the outer cylinder 48b, the lower surface 48c, and the side wall 56 of the float 48, and the washing water is applied to the internal space (regions around and above the float 48) formed by them. Form a water storage area to store water.

Next, the adjusting unit 54 of the descending start timing variable mechanism 50 will be described with reference to FIGS. 3 to 10. The adjusting portion 54 of the descending start timing variable mechanism 50 includes a vertical groove 58 extending in the axial direction (vertical direction) of the float 48, which is provided so as to penetrate the outer peripheral surface and the inner peripheral surface of the outer cylinder 48b of the float 48. A horizontal groove 60 extending horizontally to the left of the vertical groove 58 is provided. The adjusting portion 54 is further provided on the outer peripheral surface of the side wall 56, and is provided with a convex portion 62 that can be inserted into the vertical groove 58 and the horizontal groove 60 of the outer cylinder 48b of the float 48. Here, a plurality of (specifically, five) lateral grooves 60 are provided at positions having different heights along the axial direction of the float 48 at predetermined intervals. In this regard, on the surface of the side wall 56, lines 1 to 5 extending in the horizontal direction (horizontal direction) are drawn corresponding to the positions of the five lateral grooves 60 of the outer cylinder 48b of the float 48. When the convex portion 62 is inserted into the specific horizontal groove 60, the line at the corresponding position is located immediately above the upper edge of the outer cylinder 48b and can be seen from the outside (see FIG. 10). ..

In the present embodiment, the convex portion 62 is formed on the side wall 56 of the water storage portion 52, and the vertical groove 58 and the horizontal groove 60 are formed on the outer cylinder 48b of the float 48, but conversely, the vertical groove 56 is formed on the side wall 56 of the water storage portion 52. A groove and a lateral groove may be formed, and a convex portion may be formed on the outer cylinder 48b of the float 48.

Here, the guide portion 64 of the drain valve device 24 will be described with reference to FIGS. 2 and 9. The guide portion 64 is provided on the pedestal 44. Further, as shown in FIG. 2, the guide portion 64 is formed in a cylindrical shape into which the outer cylinder 48b of the float 48 can be inserted. Guide grooves 66 that project outward and extend in the vertical direction are formed at two opposite positions on the outer peripheral surface of the guide portion 64. A wall portion 61 formed on the outside of the outer cylinder 48b of the float 48 is inserted into the guide groove 66 of the guide portion 64 through a minute gap to guide the vertical movement of the water storage portion 52. .. The guide portion 64 stabilizes the vertical movement of the valve body 42.

As shown in FIG. 9, two openings 68 extending in the vertical direction along the guide groove 66 are formed on both sides of one guide groove 66 of the guide portion 64. The opening 68 is formed in a substantially rectangular shape. Since the opening 68 is formed in the guide portion 64, if there is excess wash water exceeding the set amount of water stored inside the guide portion 64, the excess wash water can be discharged from the opening 68. Therefore, the water storage amount of the water storage unit 52 is stable. Further, since the wall portion 61 formed on the outside of the outer cylinder 48b of the water storage portion 52 is inserted into the guide groove 66 extending in the vertical direction of the guide portion 64, the movement of the valve body 42 and the float 48 in the circumferential direction is restricted. It is supposed to be done.

Here, the area of the opening 68 is formed so that the water level of the washing water in the guide portion 64 drops at a rate substantially equal to the water level of the washing water in the water storage tank 18.

The descent start timing variable mechanism 50 can set the dead water level at a relatively high position by adjusting the position where the convex portion 62 is inserted into the lateral groove 60 to a high position, and conversely, the convex portion 62 By adjusting the position of insertion into the lateral groove 60 to a low position, the dead water level can be set at a relatively low position. The descent start timing variable mechanism 50 can adjust the protruding height of the side wall 56 of the water storage portion 52 by adjusting the height of the convex portion 62 with respect to the lateral groove 60.
For example, in the drain valve device 24 in which the dead water level is set at a relatively high position, the convex portion 62 of the side wall 56 of the water storage portion 52 is inserted into the uppermost lateral groove 60 of the outer cylinder 48b of the float 48, and the side wall 56 is inserted. Is in the position where the protrusion height is the highest. At this time, the amount of washing water discharged from the drain port 32 is minimized.

From the state where the convex portion 62 of the side wall 56 of the water storage portion 52 is inserted into the uppermost horizontal groove 60 of the outer cylinder 48b of the float 48, the side wall 56 is rotated clockwise when viewed from above to vertically rotate the convex portion 62. The side wall 56 is moved horizontally to the groove 58, then the side wall 56 is pushed from above to be lowered to the lowermost lateral groove 60, and the side wall 56 is further rotated counterclockwise when viewed from above to move the convex portion 62 to the lowermost position. It is inserted into the lateral groove 60 so that the protruding height of the side wall 56 of the water storage portion 52 is the lowest position. At this time, the amount of washing water discharged from the drain port 32 becomes maximum. At this time, in the drain valve device 24, the dead water level at a relatively low position is set.

Next, with reference to FIG. 6, a string body attachment portion for attaching the ball chain 30 which is a connecting member to the float 48 will be described. A ball chain mounting portion 70, which is a connecting member mounting portion for mounting the ball chain 30, is provided substantially in the center of the upper surface of the float 48. The ball chain mounting portion 70 includes a pair of vertical members 70a extending in the vertical direction and a horizontal member 70b connecting these vertical members 70a. The ring portion 30a at the lower end of the ball chain 30 is inserted through the horizontal member 70b. The ring portion 30a at the lower end of the ball chain 30 extends substantially parallel to the inner side surface 70c of each of the vertical members 70a. Therefore, the inner side surface 70c of the vertical member 70a functions as a rotation regulating portion that regulates the rotation direction of the ring portion 30a of the ball chain 30 in one direction.
In this way, the inner side surface 70c of the vertical member 70a regulates the rotation direction of the ring portion 30a of the ball chain 30 in one direction, so that interference between the ball chain 30 and the member inside the water storage tank and entanglement of the ball chain 30 itself are prevented. Can be prevented.

Next, the valve body lower float extension portion of the drain valve device according to the embodiment of the present invention will be described with reference to FIGS. 7, 8, 11 to 13.
FIG. 11 is a perspective view showing a state in which the lower float extension portion of the valve body of the drain valve device according to the embodiment of the present invention is viewed from diagonally above, and FIG. 12 is a valve body of the drain valve device according to the embodiment of the present invention. FIG. 13 is a perspective view showing a state in which the lower float extension portion is viewed from diagonally below, and FIG. 13 is a central cross-sectional view of a modified example of the valve body lower float extension portion of the drain valve device according to the embodiment of the present invention.

The valve body lower float extension portion 72 has a circular outer shape in a plan view. The valve body lower float extension portion 72 is formed in a dish shape, and the upper portion is opened upward. In other words, the valve body lower float extension portion 72 forms a cylindrical cap shape, and forms a dome-shaped protrusion portion that projects further downward from the lower surface 42b (back surface) of the valve body 42. ing. The valve body lower float extension portion 72 has a circular bottom portion 72a protruding downward in a trapezoidal shape. Therefore, the valve body lower float extension portion 72 forms an extension internal space 74 inside the dish shape inside. That is, the valve body lower float extension portion 72 is attached to the inner side of the valve body 42 and the lower side of the valve body 42, and the internal space 49 is provided on the inner side of the valve body 42 and the lower side of the valve body 42. Can be expanded. The extension internal space 74 is formed in a substantially cylindrical shape inside the float extension portion 72 below the valve body. The additional internal space 74 forms a quadrangular cross-sectional shape in the central cross section. The additional internal space 74 forms a space having a volume C2. Therefore, with the valve body lower float extension portion 72 attached, the float 48 and the valve body lower float extension portion 72 have a volume of C1 + C2, and receive a buoyancy corresponding to the volume of C1 + C2.

The valve body lower float extension portion 72 is attached to the lower part of the valve body 42 so that the extension internal space 74 and the internal space 49 communicate with each other. That is, the float 48 is expanded in a state where the valve body lower float extension portion 72 is attached to the lower part of the valve body 42, and the float 48 and the valve body lower float expansion portion 72 are added to the volume C1 of the float 48 in the expansion internal space. Air can be stored by the amount to which the volume C2 is added. Therefore, the float 48 is added by attaching the float extension portion 72 below the valve body. The valve body lower float extension portion 72 is attached to the valve body 42 and the float 48 so as to move up and down integrally with them.

A circular perforation 72b is formed in the center of the bottom portion 72a of the valve body lower float extension portion 72. Therefore, air and washing water can pass through the perforation 72b and flow into the additional internal space 74 and the internal space 49.
In the float 48 and the valve body lower float extension portion 72, only the internal space 49 of the float 48 is provided by the air stored in the internal space 49 of the float 48 and the expansion internal space 74 in a state where the washing water is present in the surroundings. It is formed to receive an even greater upward buoyancy than if it were.
Further, since the buoyancy can be generated by the air stored in the expansion internal space 74 formed in the lower part of the valve body 42 in the valve body lower float extension portion 72, the water level of the washing water is set to the height of the valve body 42. Even if the water level is lowered to the maximum, buoyancy can be reliably generated in the valve body lower float extension portion 72 located below the water level. That is, even at a lower water level than before, sufficient buoyancy can be generated in the float 48 and the valve body lower float extension portion 72, and the lowering of the valve body 42 is delayed to bring the wash water to a lower dead water level. Can be drained. Since the valve body lower float extension part 72 is almost always located below the water level, the size of the valve body lower float extension part 72 can efficiently generate buoyancy and add it to the buoyancy of the float 48. it can.

The valve body lower float extension portion 72 forms an inclined surface 72c in which at least a part of the lower outer peripheral portion is inclined inward. For example, the valve body lower float extension portion 72 may form a slope in which at least a part of the lower outer peripheral portion is inclined inward. The valve body lower float extension portion 72 is formed so as to reduce the diameter downward in the region where the inclined surface 72c is formed, and the cross-sectional area of the horizontal cross section in the region where the inclined surface 72c is formed is downward. It is formed to decrease toward.
In particular, the outer peripheral portion 72e of the valve body lower float extension portion 72 that comes into contact with the lower surface 42b of the valve body 42 is formed so as to be tapered inward from the lower surface 42b of the valve body 42 toward the drain port 32.

As a modified example, as shown in FIG. 13, even if the valve body lower float extension portion 72 forms a curved surface in which at least a part of the lower outer peripheral portion is curved inward in an arc shape. Good. For example, in FIG. 13, the valve body lower float extension portion 72 forms a curved surface in which at least a part of the lower outer peripheral portion is curved inward in an arc shape on both the left and right sides in the central cross section. ing. The valve body lower float extension portion 72 has a trumpet-like shape that opens upward in the central cross section. The curved surface is formed in an arc shape, and the washing water can flow gently along the curved surface while changing the direction.

In the present embodiment, the bottom portion 72a (the top protruding downward) of the valve body lower float extension portion 72 extends in the left-right direction further below the lower end 48d of the outer cylinder 48b of the float 48. The valve body lower float extension portion 72 is attached so that the upper surface 72f is in contact with the lower surface 42b of the valve body 42, and the upper surface 72f is in contact with the lower surface 42b of the valve body 42. The inner vertical wall 72g of the above extends vertically downward by a predetermined distance from the vicinity of the lower surface 42b, and then is connected to the bottom portion 72a extending in the lateral direction. Therefore, the valve body lower float extension portion 72 is attached to the lower surface 42b side of the valve body 42, and is based on the reference position L of the height of the valve body 42 (the position where the initial valve body inner cap 71 is arranged). An additional internal space 74 is formed in which the side surface and the upper side are covered further below the position L).
In the present invention, the valve body 42 is initially formed in the shape of a single disk, and the valve body inner cap 71 formed in the inner direction of the valve body 42 is a flat plate on substantially the same plane as the valve body 42. It was being considered to be formed on top. For comparison with the present invention, such an initial valve body inner cap 71 is shown by a dotted line in FIG. The position where such an initial valve body inner cap 71 is arranged is shown as a reference position L.
In the present invention, the valve body lower float extension portion 72 forms an extension internal space 74 in which the side surface and the upper side are covered further below the reference position L of the height of the valve body 42.

The valve body lower float extension portion 72 of the drain valve device 24 of the present invention is formed so as to be removable. The valve body lower float extension portion 72 is formed so as to be attached to the valve body 42, but the valve body lower float extension portion 72 may be formed integrally with the valve body 42 from the beginning. The valve body lower float extension portion 72 can be attached instead of the valve body inner cap 71 of the valve body 42 of the comparative example, for example, when it can be attached as described above. Therefore, the dead water level DWL2 is obtained by removing the valve body inner cap 71 and retrofitting the valve body lower float extension portion 72 to the valve body 42 and the drain valve device 24 to which the valve body inner cap 71 was initially attached. The drain valve device 24 that realizes the above can be formed. Further, in the case of the drain valve device 24 having the valve body 42 to which the valve body lower float extension portion 72 can be attached, the drain valve device 24 of the present invention can be attached by post-mounting the valve body lower float extension portion 72. Can be formed.

Next, the operation of the drain valve device 24 will be described with reference to FIGS. 14 to 16. FIG. 14 is a cross-sectional view showing a state before the start of drainage of the drain valve device according to the embodiment of the present invention, and FIG. 15 is a cross-sectional view showing a state during drainage of the drain valve device according to the embodiment of the present invention. FIG. 16 is a cross-sectional view showing a state immediately after the valve body closes the drain port and drainage is completed in the drain valve device according to the embodiment of the present invention.

In the drain valve device 24, by setting the low DWL setting, a larger amount of washing water than the high DWL setting is drained from the drain port 32. On the contrary, by setting the high DWL setting, a smaller amount of washing water than the low DWL setting is drained from the drain port 32.

FIG. 14 shows a state before the drainage of the washing water is started. In the drain valve device 24 having a low DWL setting and a high DWL setting, the drain port 32 is blocked by the valve body 42. At this time, the water levels in the water storage tank 18 are both full water levels WL0. The internal space 49 and the expansion internal space 74 are in a state where air is stored, and the float 48 and the valve body lower float expansion portion 72 receive buoyancy.

After that, when the lever handle 26 is operated, the spindle 28 rotates (see FIG. 2). As shown in FIG. 15, when the spindle 28 rotates, the valve body 42 is pulled up by the ball chain 30 and moves to the uppermost position of the movable range. As a result, the washing water is drained from the drain port 32.

The difference in operation between the drain valve device 24 with a high DWL setting and the drain valve device 24 with a low DWL setting will be briefly described below.
In the drain valve device 24 with a high DWL setting, when the washing water is drained and the water level in the water storage tank 18 reaches the water level WL1 at a predetermined height, the buoyancy and its own weight of the float 48 and the valve body lower float extension portion 72 are balanced. The valve body 42 and the float 48 start to descend in conjunction with the collapse and the subsequent decrease in the water level. On the other hand, in the drain valve device 24 with a low DWL setting, when the water level in the water storage tank 18 is the water level WL1 at a predetermined height, the buoyancy of the float 48 of the valve body 42 sufficiently acts on its own weight. It remains stagnant at the top position.

Subsequently, in the drain valve device 24 with the high DWL setting, the valve body 42 continues to descend in conjunction with the descending water level. On the other hand, in the drain valve device 24 with a low DWL setting, when the water level in the water storage tank 18 reaches the water level WL2 of a predetermined height, the balance between the buoyancy and its own weight of the float 48 and the valve body lower float extension portion 72 is lost. The valve body 42 and the float 48 start to descend in conjunction with the decrease in the water level. That is, in the drain valve device 24 with the low DWL setting, the valve body 42 starts descending later than the drain valve device 24 with the high DWL setting.

Further, even if the valve body 42 continues to descend, the washing water flows out from the opening 68 of the guide part 64, so that the washing water does not collect in the guide part 64 and the weight exceeds the washing water stored in the water storage part 52. Is not added to the float 48.

Next, in the drain valve device 24 with the high DWL setting, the valve body 42 reaches the lowest position of the movable range, comes into contact with the valve seat 43, and closes the drain port 32. When the valve body 42 approaches the lowest position in conjunction with the falling water level, it is attracted to the flow of the washing water drained from the drain port 32, and rapidly descends to reach the lowest position. Here, as shown in FIG. 16, in the drain valve device 24 with a high DWL setting, the water level when the drain port 32 is blocked by the valve body 42 is the dead water level DWL1.
On the other hand, in the drain valve device 24 with the low DWL setting, the valve body 42 continues to descend in conjunction with the descending water level.

Next, as shown in FIG. 16, the valve body 42 reaches the lowest position of the movable range even in the drain valve device 24 in the low DWL setting, which is later than the drain valve device 24 in the high DWL setting, and the drain port 32 is closed. Here, in the drain valve device 24 with a low DWL setting, the water level when the drain port 32 is closed by the valve body 42 is the dead water level DWL2, which is lower than the dead water level DWL1 in the drain valve device 24 with a high DWL setting. On the other hand, since the full water level WL0 (see FIG. 14) is the same in the drain valve device 24 of any setting, the drain valve device 24 with the low DWL setting has a larger amount of cleaning than the drain valve device 24 with the high DWL setting. Drain water from the drain port 32.

Next, the operation of the drain valve device 24 due to the drain valve device 24 including the valve body lower float extension portion 72 will be described. The valve body lower float extension portion 72 can be provided in either the drain valve device 24 having a high DWL setting or the drain valve device 24 having a low DWL setting. Since the valve body lower float extension unit 72 is particularly effective in lowering the dead water level in the drain valve device 24 with a low DWL setting, the characteristic operation of the drain valve device 24 with a low DWL setting will be described. The description of the operation of the drain valve device 24 with the high DWL setting will be omitted.

As shown in FIG. 15, when the valve body 42 is pulled up from the drain port 32, the washing water is drained. During drainage, as shown by the arrow F1, the washing water flows from the periphery of the drain valve device 24 in the water storage tank 18 toward the lower part of the valve body 42 and the drain port 32. At this time, since the valve body lower float extension portion 72 forms an inclined surface 72c in which at least a part of the lower outer peripheral portion 72e is inclined inward, as shown by the arrow F2, the washing water However, the flow of water is less likely to be obstructed along the inclined surface 72c, and the water can flow smoothly. By forming an inclined surface 72c on the outer peripheral portion 72e on the lower side of the valve body lower float extension portion 72 where the washing water flowing below the valve body 42 easily collides, the flow of the washing water as shown by the arrow F2 is valved. It is possible to prevent the body from colliding with the float extension portion 72 below the body or disturbing the flow. The internal space 49 and the expansion internal space 74 are in a state where air is stored, and the float 48 and the valve body lower float expansion portion 72 receive buoyancy.

In the present invention, the valve body lower float extension portion 72 is provided so as to further project toward the lower surface 42b side of the valve body 42. The provision of the valve body lower float extension portion 72 is effective for lowering the dead water level, but on the other hand, it is provided so as to protrude below the valve body 42, and the flow path area below the valve body 42 is increased. As a result, a part of the float extension portion 72 below the valve body easily collides with the flow of the washing water flowing downward of the valve body 42, so that there is a problem that the instantaneous flow rate of the drained washing water decreases. Occurs.

If the inclined surface is not formed on the outer peripheral portion 72e on the lower side of the valve body lower float extension portion 72 and the corner portion exists, as shown by the arrow F1, the lower side of the valve body 42. A part of the washing water flowing toward the valve collides with the outer peripheral portion 72e on the lower side of the valve body lower float extension portion 72, and this turbulence obstructs the subsequent flow and drains from the periphery of the drain valve device 24. There arises a problem that the instantaneous flow rate of the washing water flowing toward 32 decreases. When the instantaneous flow rate of the washing water supplied from the water storage tank 18 to the toilet body 2 decreases, the washing ability of the toilet body 2 decreases in the wash-off type toilet, and the siphon action is delayed in the siphon type toilet. As a result, the cleaning ability is reduced.

In the present invention, in order to solve the above-mentioned problems, even when the valve body lower float extension portion 72 is provided so as to further project toward the lower surface 42b side of the valve body 42, the valve body lower float extension portion 72 is added. An inclined surface 72c is formed on the outer peripheral portion 72e on the lower side of the portion 72, and a smooth flow of the washing water as shown by the arrow F2 is formed. Therefore, the washing supplied from the water storage tank 18 to the toilet bowl main body 2 at the time of drainage. It is possible to suppress a decrease in the instantaneous flow rate of water and realize a relatively high instantaneous flow rate.

Further, even when the washing water gradually decreases at the time of drainage, the valve body lower float extension portion 72 provided on the lower side of the valve body 42 has the washing water around and inside the extension. The space 74 is filled with air, and buoyancy is generated upward. That is, by providing the valve body lower float extension portion 72 on the lower side of the valve body 42, the valve body lower float extension portion 72 can be reliably arranged below the water level of the washing water, and the valve body lower float extension portion 72 can be reliably arranged. The buoyancy of the extension portion 72 can be added to the buoyancy of the float 48, and the timing of the start of lowering of the valve body 42 can be reliably delayed. Therefore, since the timing of the start of descent of the valve body 42 is delayed, the washing water can be drained to a lower dead water level DWL2, and the drain valve device can be drained without significantly changing the configurations of the water storage tank 18 and the drain valve device 24. While the 24 is compactly formed, the amount of washing water for the toilet body 2 at one time can be increased.
When the balance between the buoyancy and its own weight of the float 48 and the lower float extension portion 72 of the valve body is lost due to the decrease in the washing water, the valve body 42 and the float 48 are lowered in conjunction with the subsequent decrease in the water level, and the valve body 42 is lowered. , It comes into contact with the valve seat 43 and closes the drain port 32. At this time, in the water storage tank 18, the washing water is stored up to the dead water level DWL2. The internal space 49 and the expansion internal space 74 are in a state where air is stored, and the float 48 and the valve body lower float expansion portion 72 receive buoyancy. After that, the water supply device 22 supplies the washing water, the washing water is raised to the full water level WL0, and the washing operation is completed.

Regarding the dead water level of the washing water, as a comparative example, when the initial valve body inner cap 71 is formed on the valve body 42 in a state where the valve body lower float extension portion 72 is not provided (the initial valve body). The inner cap 71 (shown in FIG. 16) is not provided with the valve body lower float extension portion 72, and the timing of the start of lowering of the valve body 42 is determined only by the buoyancy generated in the float 48. Since the timing of the start of descent is earlier, the washing water can be drained only to the dead water level DWL3 (indicated by the dotted line) at a position higher than the dead water level DWL2. Initially, it is difficult to change the dead water level DWL3 with such a low DWL setting to a lower dead water level DWL2 without major design changes of the water storage tank 18 and the drain valve device 24. It was being considered.
In the present invention, such a problem is solved, and the low dead water level DWL3 having a low DWL setting can be changed to a lower dead water level DWL2 by the above-described configuration. On top of that, when the dead water level is set to DWL2, a new problem (problem of lowering the instantaneous flow rate) is solved.

As described above, according to the drainage valve device 24 according to the present embodiment, the valve body lower float extension portion 72 for adding the float 48 protrudes inward of the valve body 42 and downward of the valve body 42. By being provided, the valve body lower float extension portion 72 receives buoyancy, and the timing at which the valve body 42 closes the drain port 32 can be further delayed. Therefore, the water storage tank is provided before the valve body 42 closes the drain port 32. It is possible to drain more of the wash water in the 18 to achieve a lower dead water level in the water storage tank 18 at the time of drainage.
At this time, since the valve body lower float extension portion 72 forms an inclined surface in which at least a part of the lower outer peripheral portion 72e protruding downward from the valve body 42 is inclined inward. It is possible to prevent the washing water from colliding with the outer peripheral portion 72e on the lower side of the valve body lower float extension portion 72 at the time of drainage, and to prevent the instantaneous flow rate of the washing water from decreasing.
Therefore, even if the size of the drain valve device 24 and the size of the water storage tank 18 are not changed, the flow rate of the washing water drained from the full water level to the dead water level in the drainage operation of the water storage tank device 4 can be increased. Further, it is possible to suppress a decrease in the instantaneous flow rate of the drained wash water and enhance the cleaning ability of the toilet bowl main body 2 by the wash water drained from the drain valve device 24.

Further, according to the drain valve device 24 according to the present embodiment, the valve body lower float extension portion 72 is formed so that the cross-sectional area of the horizontal cross section decreases downward, so that the washing water is discharged at the time of drainage. It is possible to suppress collision with the outer peripheral portion 72e on the lower side of the body lower float extension portion 72, and to suppress a decrease in the instantaneous flow rate of the washing water.
Therefore, even if the size of the drain valve device 24 and the size of the water storage tank 18 are not changed, the flow rate of the washing water drained from the full water level to the dead water level in the drainage operation of the water storage tank device 4 can be increased. Further, it is possible to suppress a decrease in the instantaneous flow rate of the washing water and enhance the cleaning ability of the toilet bowl main body 2 by the washing water drained from the drain valve device 24.

Since the water storage tank device 4 according to the present embodiment includes the drain valve device 24 described above, similarly, the flow rate of the flush water drained from the full water level to the dead water level in the drainage operation of the water storage tank device 4 is increased. Furthermore, it is possible to suppress a decrease in the instantaneous flow rate of the drained washing water.

Since the flush urinal 1 according to the present embodiment includes the water storage tank device 4 described above, it is possible to increase the flow rate of the wash water drained from the full water level to the dead water level in the drainage operation of the water storage tank device 4. Further, it is possible to suppress a decrease in the instantaneous flow rate of the drained washing water.

1 Flush toilet 2 Toilet bowl body 4 Water storage tank device 6 Bowl part 7 1st water spout 8 Headrace 10 Drain trap pipe line 12 Rim part 16 2nd spout 18 Water storage tank 20 Lid 22 Water supply device 24 Drain valve device 26 Lever Handle 26a Base 28 Spindle 30 Ball chain 30a Ring 32 Drain 34 Water supply pipe 34a Water supply port 36 Small tank 38 Water supply float 40 Swinging body 42 Valve body 42a Seal part 42b Bottom surface 43 Valve seat 44 Pedestal 44a Pillar part 44b Connection part 44c Drainage space 44d Opening 46 Overflow pipe 48 Float 48a Inner cylinder 48b Outer cylinder 48c Lower surface 48d Lower end 49 Internal space 50 Descent start timing variable mechanism 52 Water storage part 54 Adjustment part 56 Side wall 58 Vertical groove 60 Horizontal groove 61 Wall part 62 Convex part 64 Guide part 66 Guide groove 68 Opening 70 Ball chain mounting part 70a Vertical member 70b Horizontal member 70c Inner side surface 71 Valve body inner cap 72 Valve body lower float extension part 72a Bottom 72b Perforation 72c Inclined surface 72e Outer circumference 72f Top surface 72g Internal vertical wall 74 Extension inside Space C1 Volume C2 Volume DWL1 Dead water level DWL2 Dead water level DWL3 Dead water level F1 Arrow F2 Arrow L Reference position WL0 Full water level WL1 Water level WL2 Water level

Claims (4)

A direct-acting drain valve device attached to the water storage tank of a water storage tank device that stores wash water.
A valve body that is attached above the drainage port provided on the bottom of the water storage tank and moves up and down in the vertical direction to open and close the drainage port.
A float attached to this valve body and lowering the valve body in conjunction with a decrease in the water level in the water storage tank,
It has a valve body lower float extension portion for adding the float by being provided so as to project inward of the valve body and downward of the valve body.
The valve body lower float extension portion forms an inclined surface in which at least a part of the lower outer peripheral portion is inclined inward from the outer edge of the outer peripheral portion .
Even for the smaller amount of drainage from the drainage port set in multiple stages, the valve body and the valve body lower float extension part are pulled up above the valve seat at the start of drainage. A drain valve device characterized by being formed . The drain valve device according to claim 1, wherein the valve body lower float extension portion is formed so that the cross-sectional area of the horizontal cross section decreases downward. A water storage tank device including the drain valve device according to claim 1 or 2. A flush toilet equipped with the water storage tank device according to claim 3.

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