JP6749580B2 - Flush water tank device and flush toilet equipped with the same - Google Patents

Description

The present invention relates to a flush water tank device for supplying flush water to a toilet bowl, and a flush toilet including the flush water tank device.

Conventionally, as a flush water tank device for supplying flush water to a toilet bowl, a drain port formed on the bottom surface of the water storage tank and a drainage provided on the outer periphery of a lower portion of an overflow pipe supported movably up and down in the water storage tank. It is known that a valve and a valve seat provided around the drainage port are provided. In such a conventional wash water tank device, the drain valve is seated from above with respect to the valve seat provided on the bottom surface of the water storage tank, and the drain valve is also moved up and down as the overflow pipe is moved up and down. Open and close.

On the other hand, in addition to the above configuration, a flush water tank device is known in which a drain valve is provided with valve body holding means for holding the drain valve substantially horizontally so as to cover the drain valve above and the peripheral portion (for example, See Patent Document 1). With this valve body holding means, it is possible to suppress the deformation of the drain valve and improve the sealing performance of the drain valve.

JP 2012-255253A

Here, in recent years, in order to improve the design and secure the size of the toilet room, it is required to reduce the depth of the flush water tank device while increasing the overall height of the flush water tank device. ..

If the overall height of the flush water tank device is reduced while the depth is narrowed and widened, the overall height of the water storage tank accommodated inside the flush water tank device is also lowered, and The water level of the washing water in the water drops. A decrease in the level of the wash water in the water storage tank causes a decrease in the head pressure on the drain valve.
In addition, according to a recent trend, from the viewpoint of environmental protection, there is a tendency to save the amount of water used for cleaning the toilet bowl once. The water storage tank stores the amount of water used for cleaning the toilet once. When the amount of water used for cleaning the toilet is saved, the amount of water stored in the water storage tank decreases. When the amount of water stored in the water storage tank decreases, the water level of the wash water in the water storage tank becomes lower when the water is full, and the head pressure on the drain valve decreases.
When the water head pressure applied to the drain valve is reduced in this way, there is a concern that the sealing performance of the drain valve will deteriorate and the wash water in the water storage tank will leak from the drain port between the drain valve and the valve seat.
Here, if the valve body holding means is provided like the flush water tank device of Patent Document 1 described above, the sealing performance may be improved to some extent even if the water head pressure is low, but it is applied to the drain valve. The water head pressure itself is reduced, and as a result, the deterioration of the drain valve sealing performance cannot be fundamentally solved. Further, when the valve body holding means is provided separately from the drain valve as in the flush water tank device described in the cited document 1, the structure becomes complicated, the cost becomes high, and the productivity is lowered. There are also concerns.

The present invention has been made in order to solve the above-mentioned problems, and even when the front-rear length of the drainage valve cannot be sufficiently secured due to the shape limitation of the water storage tank, the drainage valve of the drainage valve has a simple configuration. It is an object of the present invention to provide a wash water tank device capable of maintaining the sealing performance equal to or higher than the conventional one.

In order to achieve the above object, according to the flush water tank device of one aspect of the present invention, in a flush water tank device for supplying flush water to a toilet bowl, a drainage port is formed on the bottom surface to store flush water. A tank, a drain valve that opens and closes the drain port by moving in the vertical direction, and a valve seat that is provided around the drain port and contacts the drain valve, and the water storage tank has a length in the front-rear direction, The drain valve has a long length in the left-right direction, and the drain valve has a longer length in the left-right direction than the length in the front-rear direction.

According to this configuration, since the drain valve has a large left-right length, the drain valve has an area larger than that of the conventional drain valve in which the front-rear length and the left-right length are substantially the same. It can be formed large. Therefore, even if the length of the drainage valve in the front-rear direction cannot be sufficiently secured due to the shape restriction of the water storage tank, the sealing performance of the drainage valve can be kept equal to or higher than the conventional one with a simple configuration.
With this configuration, when the drain valve and the valve seat are brought into contact with each other, the distance from the outer peripheral edge of the drain valve to the valve seat becomes substantially uniform. Therefore, the deflection and deformation of the drain valve are suppressed, and the sealing performance of the drain valve can be further improved. Further, since the drain valve is formed in an elliptical shape, it is possible to suppress the resistance of water when the drain valve is moved up and down. Therefore, the vertical movement of the drain valve can be smoothly performed.
According to this configuration, since the drainage port 24b is formed in an elliptical shape, the drainage port 24b in the circumferential direction of the drainage port is longer than that of the drainage port according to the configuration, which has the same length in the front-rear direction. The length becomes longer. Therefore, when the drain valve is moved upward to open the drain port, it is possible to increase the instantaneous flow rate flowing into the drain port.

Further, in the flush water tank device according to one aspect of the present invention, preferably, on the downstream side of the drain port, a supply flow channel for supplying flush water to the toilet bowl extends, and the flow channel cross section has an elliptical shape. Has been formed.

According to this configuration, the supply channel 24e for supplying the wash water to the toilet extends downstream of the drain port, and the channel cross section of the supply channel 24e is formed in an elliptical shape. As a result, the length of the supply passage in the circumferential direction becomes longer than that of a true-circle supply passage having the same length in the front-rear direction as the flow passage cross section according to the configuration. Therefore, the instantaneous flow rate when the wash water flows from the drain outlet 24b into the supply flow path 24e, as compared with the true circular supply flow path having the same length in the front-rear direction as the cross section of the supply flow path according to the configuration. Will increase. As a result, it is possible to smoothly supply the flush water to the toilet while ensuring the flushing ability.

Further, the present invention is a flush toilet having a flush water tank device.

With this configuration, it is possible to provide a flush toilet having a flush water tank device having a compact structure and improved sealing performance.

According to the present invention, in the flush water tank device, even if the longitudinal length of the drainage valve cannot be sufficiently secured due to the shape limitation of the water storage tank, the drainage valve sealing performance is equivalent to that of the conventional one with a simple structure. Or you can keep it above that.

1 is a sectional view of a flush toilet to which a flush water tank device according to an embodiment of the present invention is applied. It is a perspective view of the wash water tank device concerning one embodiment of the present invention. It is sectional drawing of the wash water tank apparatus which concerns on one Embodiment of this invention. FIG. 4 is a schematic cross-sectional view of an overflow pipe and a guide portion as seen along line IV-IV in FIG. 3. FIG. 5 is a cross-sectional view of the wash water tank device taken along line VV of FIG. 3. FIG. 5 is a partially omitted cross-sectional view of the wash water tank device taken along line VV of FIG. 3.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same components are designated by the same reference numerals, and detailed description thereof will be appropriately omitted.

<Structure of flush toilet>
First, a flush toilet to which a flush water tank device according to an embodiment of the present invention is applied will be described with reference to FIG.

FIG. 1 is a cross-sectional view of a flush toilet to which a flush water tank device according to an embodiment of the present invention is applied.

As shown in FIG. 1, in a flush toilet 2 to which a flush water tank device according to an embodiment of the present invention is applied, a bowl portion 4, a water conduit 6, and a drain trap communicating with the lower portion of the bowl portion 4. And a pipe line 8 are formed.

At the upper edge of the bowl portion 4, an inwardly overhanging rim 10 and a first spout 12 for spouting the wash water supplied from the water conduit 6 are formed. The wash water discharged from the first water discharge port 12 flows down the bowl surface of the bowl portion 4 evenly, and flows down toward the water reservoir portion 14 formed below the bowl portion 4.

In the unused water state, the accumulated water portion 14 formed below the bowl portion 4 accumulates water up to the accumulated water surface W0 indicated by the alternate long and short dash line. An inlet 8a of the drain trap pipe 8 is opened below the water reservoir 14, and an ascending passage 8b extends rearward and obliquely upward from the inlet 8a. A descending path 8c is continuous to the downstream end of the ascending path 8b, and the lower end of the descending path 8c is connected to an underfloor discharge pipe (not shown) via a drain socket (not shown).

A second spout 16 for spouting the wash water supplied from the water conduit 6 may be formed below the first spout 12 and above the water surface W0 of the bowl 4. By discharging the wash water from the second water discharge port 16, it is possible to generate a swirling flow that swirls the stored water in the water storage portion 14 in the vertical direction.

A flush water tank device 20 (details of which will be described later) for storing flush water to be supplied to the flush toilet 2 is provided above the water conduit 6 of the flush toilet 2.
The wash water tank device 20 includes an exterior tank 22 made of earthenware, a water storage tank 24 made of resin contained in the exterior tank 22, and an outer lid 26 placed above the exterior tank 22.
The wash water supplied to the flush toilet 2 is stored in the water storage tank 24, and the bottom surface 24a of the water storage tank 24 communicates with the water conduit 6 to transfer the wash water stored in the water tank 24 to the water conduit 6. A drain port 24b for discharging is formed.

<Structure of wash water tank device>
Next, with reference to FIGS. 2 to 6, details of the wash water tank device according to the embodiment of the present invention will be described.
In the following, description will be given using the directions shown in the drawings.

FIG. 2 is a perspective view of a wash water tank device according to an embodiment of the present invention. FIG. 3 is a sectional view of a wash water tank device according to an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of the overflow pipe and the guide portion taken along the line IV-IV of FIG. FIG. 5 is a cross-sectional view of the wash water tank device taken along line VV of FIG. FIG. 6 is a partially omitted cross-sectional view of the wash water tank device taken along the line VV in FIG. 3.
Note that, in FIG. 2, the exterior tank 22 and the outer lid 26 are omitted for convenience of description. Further, in FIG. 3, the inner lid 28 is omitted for convenience of description. Further, in FIG. 6, the drainage device 50 is omitted for convenience of description.
In addition, in FIG. 3, the water level (maximum water level) when the water tank 24 is fully filled with water is designated by WL1.

As shown in FIGS. 2 and 3, the wash water tank device 20 further includes an inner lid 28, a water supply device 30, an operating device 40, and a drainage device 50, which are provided in the water storage tank 24. There is.

The water storage tank 24 is a so-called low silhouette type tank, has a substantially rectangular parallelepiped outer shape as a whole, and has a horizontal length (width) rather than a vertical length (height) of the water storage tank 24. It is formed long. Further, the length (depth) in the front-rear direction of the water storage tank 24 is formed to be shorter than the length (height) in the up-down direction. The exterior tank 22 in which the water storage tank 24 is housed is also a so-called low silhouette type, and like the water storage tank 24, the length (width) in the left-right direction is larger than the length (height) in the up-down direction of the exterior tank 22. ) Is long, and the length (depth) in the front-rear direction is shorter than the length (height) in the up-down direction.
In addition, an opening 25 that opens upward is formed in the upper part of the water storage tank 24 (see FIG. 3 ), and the inner lid 28 is closed so as to cover the inside of the water storage tank 24 by closing the opening 25. Is attached.

As shown in FIG. 3, the water supply device 30 includes a water supply pipe 32, a water supply valve 34, a float 36, and a water discharge part 38.
The water supply pipe 32 is a pipe extending in the up-down direction on the outside of the left side surface of the water storage tank 24, and the upstream end thereof is connected to an external water supply source (not shown). To the upstream end of the water supply pipe 32, a water supply valve 34 that is provided so as to be inserted from the outer side to the inner side of the wall on the left side of the water storage tank 24 is connected. The water supply valve 34 switches between spouting and stopping the flushing water supplied from the water supply pipe 32 to the water storage tank 24.

A float 36 is connected to the water supply valve 34. The float 36 is provided in the water storage tank 24 and moves up and down according to the fluctuation of the water level in the water storage tank 24. The opening/closing of the water supply valve 34 and the opening degree of the water supply valve 34 are switched according to the vertical movement of the float 36. As a result, the water stoppage from the water discharger 38, which will be described later, into the water tank 24 and the instantaneous flow rate from the water discharger 38 are controlled.

A water discharger 38 is connected to the downstream end of the water supply valve 34. Further, the water spouting portion 38 is provided with a water spouting port 38 a, and when the water supply valve 34 is switched to water spouting in accordance with the vertical movement of the float 36, flush water is supplied from the water spouting port 38 a of the water spouting part 38 into the water storage tank 24. The water is discharged and the wash water is stored in the water storage tank 24.

In the water supply device 30, when the wash water in the water storage tank 24 is drained to the flush toilet 2 by the drainage device 50 described later, the water level of the wash water in the water storage tank 24 is the predetermined water level WL1 to the predetermined water supply level. The water level drops to the starting water level and the float 36 descends. The predetermined water supply start water level is a position lower than the predetermined water level WL1 when full, and higher than the bottom surface 24a of the water storage tank 24. When the float 36 descends, the water supply valve 34 is switched to the water discharge side, and water discharge from the water discharge port 38a into the water storage tank 24 is started. Next, when the water discharge is continued and the water level of the wash water in the water storage tank 24 rises, the float 36 also rises. When the water level of the wash water in the water storage tank 24 rises to the predetermined full water level WL1, the float 36 also rises to a position corresponding to the predetermined full water level WL1. When the float 36 rises to a position corresponding to the predetermined full water level WL1, the water supply valve 34 is switched to the water stop side, the water discharge from the water discharge port 38a into the water storage tank 24 is completed, and the wash water is stopped. R. As a result, the water level of the wash water in the water storage tank 24 is maintained at the predetermined fully water level WL1.

The operating device 40 includes a drive unit 42, a rotating shaft 44, a handle 46, and a ball chain attaching unit 48. The operating device 40 is provided so as to be inserted from the outer side to the inner side of the water storage tank 24 at the upper part of the water storage tank 24, and when the handle 46 of the operation device 40 is operated, the rotating shaft 44 rotates and the drainage described later. The device 50 operates.

The drive unit 42 is provided outside the water storage tank 24, and inside the drive unit 42, a rotary shaft 44 that extends from the drive unit 42 through the wall on the right side of the water storage tank 24 and extends into the water storage tank 24 is provided. Has been. In other words, the rotating shaft 44 is provided so as to be inserted from the outer side to the inner side of the wall on the right side of the water storage tank 24. A handle 46 is provided at one end of the rotating shaft 44 (outside of the water storage tank), and a chain attachment portion 48 is provided at the other end (inside of the water storage tank). One of the ball chains 54 described later is mounted on the ball chain mounting portion 48.

Further, inside the drive unit 42, a motor (not shown) and a receiving unit (not shown) that receives a command signal from a controller (not shown) provided outside the wash water tank device 20. , Are provided. When the receiving unit receives the command signal from the controller, the motor inside the drive unit 42 is driven based on the command signal. By driving this motor, the rotating shaft 44 rotates and the drainage device 50 described later operates.
Here, the “command signal from the controller” means, for example, a signal from a human body detection sensor (not shown) provided in the flush toilet 2 to detect a human body (for example, a user), or a flush large signal. The signal is, for example, a signal indicating that a user operates a cleaning button (not shown) for instructing a cleaning operation of the toilet bowl 2.

The drainage device 50 includes an overflow pipe 52, a ball chain 54, a drainage valve 56, and a guide member 58.
The drainage device 50 is provided above the drainage port 24b, and stores the wash water in the water storage tank 24 by opening and closing the drainage port 24b, or drains the wash water in the water storage tank 24 to the flush toilet 2. To do.

The overflow pipe 52 is a cylindrical member that extends in the vertical direction, and has an inlet 52a and an outlet 52b at the upper end and the lower end. The inlet portion 52a of the overflow pipe 52 is opened upward, and when the wash water in the water storage tank 24 becomes higher than a predetermined full water level WL1, the wash water flows from the inlet portion 52a into the overflow pipe 52. To do. On the other hand, since the outlet portion 52b of the overflow pipe 52 is opened to face directly above the drain port 24b, the flush water flowing into the overflow pipe 52 passes through the outlet portion 52b and is discharged from the drain port 24b to the flush toilet 2 Drained to.

A drain valve mounting portion 52c is provided on the outer peripheral side of the lower end of the overflow pipe 52. The drain valve mounting portion 52c is a brim-shaped portion projecting from the outer peripheral surface of the overflow pipe 52 toward the outer peripheral side from the central axis of the overflow pipe 52, and is formed in a disc shape as a whole. Further, a groove having a recess is formed over the entire circumference of the disk-shaped peripheral surface of the drain valve mounting portion 52c. The size of the vertical gap of the groove and the vertical thickness of the drain valve 56, which will be described later, are formed to be substantially the same. Therefore, the drain valve 56 is fitted in the groove of the drain valve mounting portion 52c, and the drain valve 56 is connected to the overflow pipe 52.
The vertical thickness of the drain valve 56 is larger than the size of the vertical gap of the groove of the drain valve mounting portion 52c so that the drain valve mounting portion 52c and the drain valve 56 can be fitted to each other. May be.

A ball chain attachment portion 52d is provided at the lower end of the overflow pipe 52. The ball chain attachment portion 52d protrudes downward from three positions in the front-rear direction and the right direction of the edge portion that defines the outlet portion 52b of the overflow pipe 52, and each of the portions protruding downward from the three positions is the center of the overflow pipe 52. Bent in the direction toward the axis. Then, a portion to which the ball chain 54 is attached is formed at a position substantially overlapping the central axis of the overflow pipe 52.
Here, a ball chain 54 is vertically inserted in the conduit of the overflow pipe 52, and one side of the ball chain 54 is attached to the ball chain attaching portion 48 of the operating device 40 and the other side of the ball chain 54. Is attached to the ball chain attachment portion 52d of the overflow pipe 52. At this time, the ball chain 54 extends along the central axis of the overflow pipe 52.

At the central portion of the overflow pipe 52 in the vertical direction, a protrusion 52e as a protrusion extending in the vertical direction is provided on the outer peripheral surface of the overflow pipe 52. The protrusions 52e are provided at four locations at substantially equal intervals along the circumferential direction of the outer peripheral surface of the overflow pipe 52.

The drainage valve 56 that fits into the groove of the drainage valve mounting portion 52c of the overflow pipe 52 is a disc-shaped seal member and is made of a rubber material. Further, a mounting hole (not shown) is opened at a substantially central portion of the drain valve 56. The inner peripheral portion of this mounting hole is inserted so as to fit into the groove of the drain valve mounting portion 52c of the overflow pipe 52, and the drain valve 56 is fixed to the overflow pipe 52. As a result, the drain valve 56 also moves up and down as the overflow pipe 52 moves up and down, and the drain valve 56 opens and closes the drain port 24b.

Here, as shown in FIG. 5, the drain valve 56 when the water storage tank 24 is viewed from above is formed in an elliptical shape having a length in the left-right direction that is longer than a length in the front-rear direction. That is, the drain valve 56 corresponds to the plan view shape of the water storage tank 24 having a substantially rectangular shape with the left-right direction as the longitudinal direction, and an ellipse with the major axis direction along the left-right direction and the short axis direction along the front-rear direction. Has an outer shape. The drain valve 56 has an outer diameter larger than the outer diameter of the valve seat 24c described later and smaller than the outer diameter of the outer peripheral end of the recess 24d described later.
Further, the outer shape of the drain valve mounting portion 52c of the overflow pipe 52 when the water storage tank 24 is viewed from above is also formed in an elliptical shape having a length in the left-right direction longer than a length in the front-rear direction. The outer diameter of the drain valve mounting portion 52c is smaller than the inner diameter of the valve seat 24c described later. Further, the horizontal interval from the outer peripheral edge of the drain valve 56 to the outer peripheral edge of the drain valve mounting portion 52c is formed to be substantially uniform. That is, the outer shape of the drainage valve mounting portion 52c is an elliptical shape that follows the outer shape of the drainage valve 56, and the drainage valve 56 and the drainage valve mounting portion 52c have the elliptical outer shape with respect to the major axis direction and the minor axis direction. They are provided so as to be matched and concentric with each other.

Returning to FIG. 3, the guide member 58 is provided so as to cover the outer circumference of the overflow pipe 52, and holds the overflow pipe 52 slidably in the vertical direction. Further, the guide member 58 has a support leg 58a, a fixed leg 58b, a storage portion 58c, and a guide portion 58d. The storage portion 58c and the guide portion 58d are integrally formed.

The support legs 58a of the guide member 58 are columnar portions provided upright on the bottom surface 24a of the water storage tank 24, and are provided around the drainage outlet 24b at four predetermined intervals. A cylindrical storage portion 58c and a guide portion 58d formed integrally with the storage portion 58c are placed on the upper ends of the four support legs 58a, and the support leg 58a supports the storage portion 58c and the guide portion 58d from below. doing. That is, the support leg 58a supports the storage portion 58c and the guide portion 58d at a position above the bottom surface 24a of the water storage tank 24 by a predetermined distance.

Similarly to the support legs 58a, the fixed legs 58b of the guide portion are columnar portions erected on the bottom surface 24a of the water storage tank 24, and are provided around the drainage port 24b at predetermined intervals. A snap fit for fixing the storage portion 58c is provided at the tips of the four fixed legs 58b, and the snap fit of the fixed leg 58b is fitted into the snap fitting fitting hole provided at the lower end of the storage portion 58c. By fitting, the storage portion 58c is fixed to the fixed leg 58b.

The storage portion 58c and the guide portion 58d are formed in a substantially cylindrical shape having different diameters, and the small diameter guide portion 58d is integrally formed above the large diameter storage portion 58c. That is, the accommodating portion 58c and the guide portion 58d of the guide member 58 are continuously formed such that the accommodating portion 58c or the guide portion 58d is hung from the accommodating portion 58c so that the outer diameter and the inner diameter of the accommodating portion 58c or the guide portion 58d are reduced. ing.
Further, the overflow pipe 52 is housed inside the housing portion 58c and the guide portion 58d. The storage portion 58c has a tubular shape that extends upward from the height position of the upper ends of the support legs 58a, and horizontally extends in the direction toward the central axis of the overflow pipe 52 so as to partially close the upper end opening of the extended portion. Overhangs are formed. The guide portion 58d is formed so as to extend in a tubular shape upward from an opening formed in the substantial center of the projecting portion.

The inner shape of the storage portion 58c when the drainage device 50 is viewed from below is formed in a substantially elliptical shape, and is formed larger than the outer shape of the drainage valve 56. That is, the storage portion 58c stores the drain valve 56 so as to surround the drain valve 56 when the drain valve 56 is pulled up to the upper position. Further, the outer shape of the storage portion 58c when the drainage device 50 is viewed from above is formed in a substantially elliptical shape similarly to the inner shape of the storage portion 58c.

As shown in FIG. 4, the guide portion 58d is provided with a recessed portion 58e as a groove extending vertically in the inner peripheral surface thereof. The recesses 58e are provided at four locations at substantially equal intervals along the circumferential direction of the inner peripheral surface of the overflow pipe 52. Further, the overflow pipe 52 is inserted into the guide portion 58d so that the projection 52e of the overflow pipe 52 is arranged in the recess 58e. That is, the inner shape of the guide portion 58d is formed so as to follow the outer peripheral surface of the overflow pipe 52 at the position where the protruding portion 52e is provided. More specifically, the guide portion 58d has a substantially quarter arc-shaped portion along the peripheral wall portion of the overflow pipe 52 and a protruding portion outward in the radial direction that receives the protruding portion 52e in the cross-sectional shape as shown in FIG. (Recessed portions 58e) are provided alternately at four locations in the circumferential direction.

Returning to FIG. 3, a valve seat 24c with which the drainage valve 56 abuts is provided in an annular shape around the drainage port 24b of the water storage tank 24. The valve seat 24c is a convex portion (projection portion) protruding upward from the bottom surface 24a of the water storage tank 24, and the outer diameter of the valve seat 24c is formed smaller than the outer diameter of the drain valve 56 (Fig. 5 and FIG. 6).
Around the valve seat 24c, a recess 24d that is recessed downward from the bottom surface 24a is provided. Therefore, for example, when the water storage tank 24 is molded, even if the valve seat 24c is deformed such as a sink mark, it is possible to keep the valve seat 24c protruding from the bottom surface 24a of the water storage tank. is there. That is, by providing the concave portion 24d around the valve seat 24c, the relative amount of protrusion of the valve seat 24c is increased by the amount that the concave portion 24d is lower than the bottom surface 24a, and the amount of protrusion of the valve seat 24c is secured. ..

On the downstream side of the drain port 24b, a supply flow path 24e for supplying the wash water to the water conduit 6 of the flush toilet 2 extends. The supply flow path 24e extends downward from the drainage port 24b, and a supply flow path outlet 24f communicating with the drainage port 24b opens at the downstream end of the supply flow path 24e. Therefore, the wash water drained from the drainage port 24b is discharged to the water conduit 6 of the flush toilet 2 from the supply channel outlet 24f via the supply channel 24e.

Further, as shown in FIGS. 5 and 6, the drain port 24 b and the valve seat 24 c are formed in an elliptical shape so as to follow the outer shape of the drain valve 56. Further, the valve seat 24c is formed so that the horizontal distance from the outer peripheral edge of the drain valve 56 to the valve seat 24c is substantially uniform when the drain valve 56 and the valve seat 24c are in contact with each other. Further, the flow passage cross section of the supply flow passage 24e and the supply flow passage outlet 24f are also formed in an elliptical shape. That is, in the flush water tank device 20 of the present embodiment, in plan view, the opening shape of the drain port 24b, the surrounding shape of the valve seat 24c, the flow path cross-sectional shape of the supply flow path 24e, and the open shape of the supply flow path outlet 24f. Each of the (flow passage cross-sectional shape) is an elliptical shape that follows the outer shape of the drainage valve 56, and the portion forming each shape has a major axis with respect to the elliptical shape that is the outer shape of the drainage valve 56. It is provided so that the direction and the minor axis direction coincide with each other and are concentric.

<Operation and action>
Next, the operation and action of the wash water tank device according to the embodiment of the present invention will be described with reference to FIGS. 3 and 5.

First, in the state before the user uses the flush toilet 2, as shown in FIGS. 3 and 5, the drain valve 56 and the valve seat 24c are in contact with each other over the entire circumference, and the drain valve 56 drains water. The mouth 24b is closed (initial state).

In this initial state, the wash water is stored in the water storage tank 24 up to the height position of the water level WL1 when the water level is predetermined, and the drain valve 56 is under head pressure. Due to this head pressure, the drain valve 56 is pressed against the valve seat 24c from the upper side to the lower side.
The term "water head pressure" as used herein means that the drain valve 56 and the valve seat 24c are in contact with each other, and the flush water is stored in the water storage tank 24 up to the height of WL1. It represents the magnitude of water pressure per unit area.
Here, the sealing performance of the drainage valve 56 with respect to the valve seat 24c is affected by the magnitude of the water head pressure, the area of the surface of the drainage valve 56 to which the water head pressure is applied, or both. That is, the larger the head pressure and the larger the surface area of the drain valve 56 to which the head pressure is applied, the more the sealing performance of the drain valve 56 with respect to the valve seat 24c is improved.

Here, in the state where the drain valve 56 and the valve seat 24c are in contact with each other, the horizontal interval from the outer peripheral edge of the drain valve mounting portion 52c to the contact position of the drain valve 56 and the valve seat 24c is the entire circumference. Is almost uniform. Therefore, when the drain valve mounting portion 52c having relatively high rigidity is pushed downward and the drain valve 56 is pressed against the valve seat 24c, the force applied from the drain valve mounting portion 52c to the drain valve 56 is applied to the valve seat 24c. And transmitted almost uniformly. In other words, the stress applied to the drainage valve 56 by the contact with the valve seat 24c becomes substantially uniform over the entire circumference of the drainage valve 56. Thereby, the sealing force between the drain valve 56 and the valve seat 24c can be improved.
Further, in a state where the drain valve 56 and the valve seat 24c are in contact with each other, a part of the drain valve 56 (a part on the outer peripheral side) extends to the outer peripheral side from the contact position of the drain valve 56 and the valve seat 24c. The horizontal interval from the outer peripheral edge of the drainage valve 56 to the contact position between the drainage valve 56 and the valve seat 24c is substantially uniform over the entire circumference. Therefore, the force applied to the drain valve 56 from the contact position with the valve seat 24c to the outer peripheral edge of the drain valve 56 (force due to the head pressure) is substantially uniform over the entire circumference of the drain valve 56. Thereby, the deformation of the drain valve 56 from the contact position with the valve seat 24c to the outer peripheral edge of the drain valve 56 is suppressed, and the sealing force between the drain valve 56 and the valve seat 24c can be improved. Furthermore, since the deformation of the drain valve 56 is suppressed, the deterioration of the drain valve 56 can also be suppressed.
In addition, "substantially uniform" includes a case where it is completely uniform and a case where it is uniform enough to exert an effect.

Next, when the user operates the handle 46 of the operating device 40 after using the flush toilet 2 or drives the motor inside the drive unit 42 by a command signal from a controller (not shown), the rotary shaft 44 rotates. .. When the rotary shaft 44 rotates, the ball chain mounting portion 48 provided at the end of the rotary shaft rotates, and the ball chain 54 mounted on the ball chain mounting portion 48 rises.

Since one end of the ball chain 54 is attached to the ball chain mounting portion 52d of the overflow pipe 52, the overflow pipe 52 and the drain valve 56 ascend as the ball chain 54 rises. At this time, the overflow pipe 52 rises while being guided by the guide portion 58d, and therefore rises while the inclination of the overflow pipe 52 is suppressed.
Further, since the drain valve 56 is formed in an elliptical shape, the resistance of water when the drain valve 56 is raised is suppressed. This allows the drain valve 56 to operate smoothly.

When the drain valve 56 rises, a gap is created between the drain valve 56 and the valve seat 24c, and the wash water in the water storage tank 24 flows into the drain port 24b through this gap. Then, while the drain valve 56 opens the drain port 24b, the water is drained from the drain port 24b to the water conduit 6 of the flush toilet 2 via the supply flow path 24e. The wash water in the water conduit 6 is spouted from the first spout or the second spout, and the flush toilet 2 is washed.

Here, when a perfect circular drain port having an inner diameter of the drain port 24b in the front-rear direction is hypothesized to the elliptical drain port 24b, the circumferential direction of the perfect circular drain port is assumed. The length of the elliptical drainage outlet 24b in the circumferential direction is longer than the length of. Therefore, as compared with the case of a virtual perfect circular drainage port, the elliptical drainage port 24b is a drainage valve when the drainage valve 56 is raised from the state where the drainage valve 56 closes the drainage port 24b. The area of the elliptic cylinder peripheral surface defined by the locus of the outer peripheral edge of 56 increases. That is, the elliptical drainage outlet 24b increases the instantaneous flow rate of the wash water flowing into the drainage outlet 24b through the gap between the drainage valve 56 and the valve seat 24c, as compared with the perfect circular drainage outlet.

Further, since the flow passage cross section of the supply flow passage 24e is formed into an elliptical shape, as in the case of the drainage port 24b described above, a true length of the flow passage cross section of the supply flow passage 24e is defined as an inner diameter dimension. The instantaneous flow rate of the wash water flowing through the supply flow path 24e is increased as compared with the circular flow path. In addition, since, for example, a throttle is not provided in the middle of the supply channel 24e, pressure loss in the pipeline of the supply channel 24e is suppressed.
Furthermore, since the flow passage cross section of the supply flow passage outlet 24f is formed into an elliptical shape, when the wash water is drained from the supply flow passage 24e to the water conduit 6, the wash water can be smoothly drained.

Next, when the overflow pipe 52 and the drainage valve 56 are raised to the highest position, the outer peripheral edge of the drainage valve 56 is enclosed and stored inside the storage portion 58c.

Then, after a predetermined time has elapsed, or by a command from a controller (not shown), the motor inside the drive unit 42 is driven to rotate the rotation shaft 44 in the opposite direction (the direction opposite to the rotation direction when the chain 54 is raised). When rotated, the ball chain 54 is pulled down, and the overflow pipe 52 and the drain valve 56 start to descend. At this time, since the overflow pipe 52 descends while being guided by the guide portion 58d, the overflow pipe 52 descends while suppressing the inclination of the overflow pipe 52.

When the overflow pipe 52 and the drain valve 56 descend and the drain valve 56 comes into contact with the valve seat 24c, the drain port 24b is closed and the supply of flush water to the water conduit 6 of the flush toilet 2 is completed.

After the drainage port 56 is closed by the drainage valve 56, the water supply valve 34 is switched to the water discharge side by the float 36 that descends as the water level of the wash water in the water storage tank 24 decreases, and the water discharge port 38a is discharged from the water discharge port 38a. Water discharge to the inside is started. When the water discharge is continued, the float 36 also rises as the level of the wash water in the water storage tank 24 rises. When the water level of the wash water in the water storage tank 24 rises to WL1, the water supply valve 34 is switched to the water stop side by the float 36, and the water discharge from the water discharge port 38a into the water storage tank 24 ends. When the water discharge is completed, the wash water tank device 20 returns to the initial state.

According to the flush water tank device 20 according to the embodiment of the present invention described above, since the horizontal length of the drain valve 56 is wide, the front-back length and the horizontal length are substantially the same. The drain valve 56 can be formed to have a larger area than the drain valve of FIG. Therefore, even if the front-rear length of the drainage valve 56 cannot be sufficiently secured due to the shape restriction of the water storage tank 24, it is possible to maintain the sealing performance of the drainage valve 56 at the same level or higher than the conventional one with a simple configuration. it can.

Further, according to the flush water tank device 20 according to the embodiment of the present invention described above, since the drain valve 56 and the valve seat 24c are formed in an elliptical shape, when the drain valve 56 and the valve seat 24c are brought into contact with each other. The distance from the outer peripheral edge of the drain valve 56 to the valve seat 24c becomes substantially uniform. Therefore, the deflection and deformation of the drain valve 56 are suppressed, and the sealing performance of the drain valve 56 can be further improved.
In addition, since the drain valve 56 is formed in an elliptical shape, it is possible to suppress the resistance of water when the drain valve 56 is moved up and down, as compared with, for example, a case where the drain valve 56 is formed in a rectangular shape. it can. Therefore, the vertical movement of the drain valve 56 can be smoothly performed.

Further, according to the flush water tank device 20 according to the embodiment of the present invention described above, since the drainage port 24b is formed in an elliptical shape, a circular drainage having the same length in the front-rear direction as the drainage port 24b. The drainage port 24b has a longer circumferential length than the mouth. Therefore, when the drain valve 56 is moved upward to open the drain port 24b, it is possible to increase the instantaneous flow rate into the drain port 24b and ensure the cleaning ability.

Further, according to the flush water tank device 20 according to the embodiment of the present invention described above, the supply channel 24e for supplying flush water to the toilet extends to the downstream side of the drain port 24b, and the channel of the supply channel 24e. The cross section is formed in an elliptical shape. As a result, the circumferential length of the flow passage cross section of the supply flow passage 24e is larger than that of the circular supply flow passage having the same length in the front-back direction as the flow passage cross section of the supply flow passage 24e. become longer. Therefore, the instantaneous flow rate of the wash water flowing from the drain port 24b into the supply channel 24e increases as compared with the circular supply channel having the same length in the front-rear direction as the cross section of the supply channel 24e. .. As a result, the cleaning water can be smoothly supplied to the flush toilet 2 while ensuring the cleaning ability.

Further, according to the flush water tank device 20 according to the embodiment of the present invention described above, it is possible to provide the flush toilet 2 having the flush water tank device 20 having a compact structure and improved sealing performance.

<Modification>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned one embodiment.

Although the exterior tank 22 is made of earthenware and the water storage tank 24 is made of resin, both may be made of resin or earthenware, or may be made of other materials.

Further, the switching of the water discharge and the water stoppage in the water supply valve 34 is described by the vertical movement of the float 36, but the water discharge and the water stoppage may be switched by a method other than the vertical movement of the float 36. For example, the wash water tank device 20 is provided with a water level sensor for detecting the water level of the wash water stored in the water storage tank 24, and the water supply valve 34 is configured to switch between water discharge and water stop based on detection information from the water level sensor. May be.

Further, the drain valve 56 when viewed from above has been described as having an elliptical shape, but it is sufficient if the drain valve 56 is formed to be longer in the left-right direction than the length in the front-rear direction of the drain valve. The shape of the drainage valve at this time may be formed in, for example, a rectangular shape or a rhombus shape. That is, as the outer shape of the drain valve 56, when the left-right direction that is the longitudinal direction in the plan view shape of the water storage tank 24 is the first direction and the front-rear direction that is the lateral direction is the second direction, the first direction is the first direction. The shape may be such that the dimension in the direction is longer than the dimension in the second direction.

Further, the drainage device 50 has been described as having a configuration in which the drainage valve 56 moves up and down to open and close the drainage port 24b, but it is sufficient if the drainage valve 56 closes the drainage port 24b, for example, the drainage valve 56. A part of the above may be pivotally supported by the water storage tank 24 to open and close the drain port 24b like a door.

Although the drain valve 56 has been described as being made of a rubber material, it may be made of any other synthetic resin material as long as it has a function of sealing the drain port.

The respective elements included in the above-described respective embodiments can be combined as long as technically possible, and a combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

2 flush toilet 4 bowl part 6 water conduit 8 drain trap line 8a inlet 8b ascending path 8c descending path 10 rim 12 first water outlet 14 reservoir part 16 second water outlet 20 wash water tank device 22 exterior tank 24 water storage tank 24a Bottom face 24b Drain port 24c Valve seat 24d Recess 24e Supply channel 24f Supply channel outlet 25 Opening 26 Outer lid 28 Inner lid 30 Water supply device 32 Water supply pipe 34 Water supply valve 36 Float 38 Water discharge part 38a Water discharge port 40 Drive device 42 Drive Part 44 Rotating shaft 46 Handle 48 Ball chain mounting part 50 Drainage device 52 Overflow pipe 52a Inlet part 52b Outlet part 52c Drain valve mounting part 52d Ball chain mounting part 52e Projection part 54 Ball chain 56 Drain valve 58 Guide member 58a Support leg 58b Fixed Leg 58c Storage part 58d Guide part 58e Recessed part W0 Water surface WL1 Water tank full water level

Claims (3)

In the flush water tank device that supplies flush water to the toilet bowl,
A drainage tank is formed on the bottom surface, and a water storage tank for storing cleaning water,
A drain valve that opens and closes the drain port by moving in the vertical direction ,
A valve seat that is provided around the drainage port and contacts the drainage valve,
The water storage tank is longer in the left-right direction than in the front-rear direction,
The drain valve is longer in the left-right direction than the length in the front-rear direction,
The flush water tank device in which the drain valve, the valve seat, and the drain port are formed in an elliptical shape . On the downstream side of the drain outlet, a supply flow path for supplying flush water to the toilet bowl extends,
The wash water tank device according to claim 1 , wherein a cross section of the supply flow passage is formed in an elliptical shape. Flush toilet having a flushing water tank apparatus according to claim 1 or 2.

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