JP7846866B2 - A flushing water tank device, and a flush toilet device equipped therewith. - Google Patents

Description

This invention relates to a flushing water tank device, and more particularly to a flushing water tank device for supplying flushing water to a flush toilet body, and a flush toilet device equipped therewith.

U.S. Patent Application Publication No. 2011/0231988 (Patent Document 1) describes a drain valve having a valve seat with a reduced cross-sectional area. In this drain valve, the valve body of the drain valve is lifted from the seat surface of the drain valve, which is located at the bottom of the flush water tank, thereby allowing the flush water in the tank to flow into the drain passage and supply flush water to the toilet bowl body.

U.S. Patent Application Publication No. 2011/0231988

However, in the drain valve described in Patent Document 1, when the valve body of the drain valve is lifted from the seat surface, the flushing water in the flushing water tank flows rapidly towards the center of the seat surface. As a result, the flow of flushing water flowing out of the flushing water tank separates from the inner wall surface of the drainage passage, preventing the flushing water in the flushing water tank from flowing smoothly into the toilet bowl body, and resulting in a problem of reduced instantaneous flow rate of flushing water supplied to the toilet bowl body.

Therefore, the present invention aims to provide a flushing water tank device that can suppress the instantaneous decrease in the flow rate of flushing water supplied to the toilet bowl immediately after opening the drain valve, and a flushing toilet bowl equipped therewith.

To solve the above-mentioned problems, the present invention provides a flushing water tank device for supplying flushing water to a flush toilet body, comprising: a flushing water tank body for storing flushing water; a drainage passage formed to extend downward from the bottom surface of the flushing water tank body; an annular seat surface provided to surround the inlet of the drainage passage; and a drain valve that, by seating on and lifting off the seat surface, discharges and stops the flushing water from the flushing water tank body. The bottom of the flushing water tank body is provided with a flow guide section that reduces the flow velocity of the flushing water towards the center of the drainage passage within the flushing water tank body.

According to the present invention configured as described above, a flow guide is provided at the bottom of the flushing water tank body to reduce the flow velocity of the flushing water towards the center of the drainage passage within the flushing water tank body. This reduces the horizontal component of the flushing water flow velocity towards the center of the drainage passage. As a result, the flushing water flowing out of the flushing water tank body flows more easily along the inner wall surface of the drainage passage located inside the seat surface, suppressing the separation of the flushing water flow from the inner wall surface of the drainage passage. This allows for a higher instantaneous flow rate of flushing water flowing out of the flushing water tank body, thereby improving the flushing performance of the toilet bowl.

In this invention, preferably, the flow guidance section is a surrounding wall surface provided on the outside of the sheet surface so as to surround the sheet surface.

According to the present invention configured in this way, since the flow guidance section is composed of a surrounding wall surface provided on the outside of the sheet surface so as to surround the sheet surface, the cleaning water directed toward the center of the sheet surface flows over the surrounding wall surface, thereby reducing the horizontal component of the flow velocity of the cleaning water toward the center of the sheet surface.

In this invention, preferably, the upper end of the flow guide portion is located above the tangent line at the inlet of the drainage passage in a vertical cross-section.

According to the present invention configured in this manner, since the upper end of the flow guide portion is located above the tangent to the inlet of the drainage passage in the vertical cross-section, the cleaning water directed toward the center of the sheet surface must overcome the higher flow guide portion, thereby sufficiently reducing the horizontal component of the flow velocity toward the center of the sheet surface.

In this invention, preferably, the drain valve is configured to be pulled upward from the seat surface, and when the drain valve is pulled up to its maximum extent, the vertical distance from the upper end of the surrounding wall surface to the drain valve is at least half the vertical distance from the seat surface to the drain valve.

According to the present invention configured as described above, when the drain valve is raised to its highest position, the vertical distance from the upper end of the surrounding wall surface to the drain valve is more than half the vertical distance from the seat surface to the drain valve. Therefore, a sufficient flow cross-sectional area for the washing water can be secured between the upper end of the surrounding wall surface and the drain valve. This prevents a decrease in instantaneous flow rate caused by the presence of the surrounding wall surface.

In this invention, preferably, the surrounding wall surface enclosing the sheet surface is partially cut out.

According to the present invention configured in this way, the surrounding wall surface enclosing the sheet surface is partially cut out. Therefore, a relatively large horizontal component of flow velocity is maintained in the cut-out portion, and the horizontal component of flow velocity toward the center of the sheet surface can be adjusted by the size of the cut-out.

In this invention, preferably, a portion of the surrounding wall surface of the flow guide section is integrated with the wall surface of the washing water tank body.

According to the present invention configured in this way, since a portion of the surrounding wall surface constituting the flow guidance section is integrated with the wall surface constituting the washing water tank body, the present invention can also be applied to washing water tank devices in which the sheet surface is located near the wall surface of the washing water tank body.

Furthermore, the present invention is a flush toilet device that is cleaned with flushing water, characterized by comprising a flush toilet body and a flushing water tank device of the present invention provided at the rear of the flush toilet body for supplying flushing water to the flush toilet body.

The flushing water tank device of the present invention can suppress the instantaneous decrease in the flow rate of flushing water supplied to the toilet bowl immediately after opening the drain valve.

This is a plan view showing a flush toilet device according to an embodiment of the present invention. This is a side cross-sectional view of a flush toilet device according to an embodiment of the present invention, along the line II-II in Figure 1. This is an enlarged cross-sectional view showing the connection portion between the toilet body and the flushing water tank body in a flushing toilet device according to an embodiment of the present invention. This is a magnified cross-sectional view showing the drain port portion of the washing water tank body provided in the washing water tank device according to an embodiment of the present invention. This is a top view of the washing water tank body provided in a washing water tank device according to an embodiment of the present invention. This is a top view of the washing water tank body, using a comparative example. This is a top view of a modified washing water tank body of a washing water tank device according to an embodiment of the present invention.

Next, with reference to the attached drawings, a flushing water tank device according to an embodiment of the present invention and a flush toilet device equipped therewith will be described.
Figure 1 is a plan view showing a flush toilet device according to an embodiment of the present invention. Figure 2 is a side cross-sectional view taken along the line II-II in Figure 1.

As shown in Figures 1 and 2, the flush toilet device 1 according to an embodiment of the present invention is a siphon-jet type flush toilet, comprising a ceramic flush toilet body 2, a resin toilet seat and lid (not shown) positioned on the upper surface of the flush toilet body 2, and a flush water tank device 4 positioned at the rear upper part of the flush toilet body 2 and covered by a resin cover (not shown).

The toilet bowl body 2 includes a bowl section 6 for receiving waste, a drain trap pipe 8 located at the bottom of the bowl section 6 for discharging waste via siphon action, a rim outlet 10 for rim water discharge, a rim water channel 12 for guiding flushing water to the rim outlet, a jet outlet 14 for jet water discharge, and a jet water channel 16 for guiding flushing water to the jet outlet 14.

The bowl section 6 comprises a bowl-shaped waste receiving surface 18, a rim section 20 formed along the upper edge of the bowl section 6, and a shelf section 21 formed between the waste receiving surface 18 and the rim section 20. The bowl section 6 also includes a pot section 22 formed in the area below the waste receiving surface 18 and connected to the drain trap pipe 8. A water seal surface W is formed inside this pot section 22.

The drain trap pipe 8 comprises an inlet 8a, an upward pipe 8b extending upward from the inlet 8a, a downward pipe 8c extending downward from the upward pipe 8b, and a top 8d located between the downward pipe 8c and the upward pipe 8b, which defines the water seal level.
Here, the lower end of the descending pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

The rim spout 10 is formed on the left rear side of the rim portion 20 when viewed from the front of the toilet bowl body 2. The rim spout 10 discharges flushing water forward, and this flushing water flows down to the waste receiving surface 18 while swirling on the inner circumferential surface of the rim portion 20 and the shelf surface of the shelf portion 21.

The rim water conduit 12 is formed in a tapered shape, with the cross-sectional area of the flow path gradually decreasing towards the rim outlet 10. Washing water is supplied to the rim water conduit 12 from the water supply via the washing water tank device 4, and the washing water is discharged from the rim outlet 10 due to the water supply pressure from the water supply.

The jet outlet 14 is formed at the bottom of the bowl section 6. The jet outlet 14 is positioned opposite the inlet 8a of the drain trap pipe 8 and directed towards the inlet 8a. The jet outlet 14 discharges cleaning water towards the inlet 8a of the drain trap pipe 8, causing this cleaning water to flow into the drain trap pipe 8 and activate the siphon effect.

The jet water channel 16 comprises an upstream channel 16a extending forward from the flushing water tank device 4, a bent channel 16b branching off from the upstream channel, and a downstream channel 16c extending backward from the bent channel and connecting to the jet outlet 14. Flushing water is supplied to the jet water channel 16 from the flushing water tank body 26 of the flushing water tank device 4, and the flushing water is discharged from the jet outlet 14 due to the head pressure of the flushing water. Thus, in this embodiment, the flushing water discharged from the rim outlet 10 is supplied directly from the water supply, while the flushing water discharged from the jet outlet 14 is supplied from the flushing water tank body 26. However, as a modification, the present invention can also be applied to a flush toilet device in which the entire amount of flushing water supplied is supplied from a flushing water tank.

Next, with further reference to Figures 3 to 5, the configuration of the washing water tank device 4 according to an embodiment of the present invention will be described.
Figure 3 is an enlarged cross-sectional view showing the connection between the toilet body 2 and the flushing water tank body 26 in the flushing toilet device 1 of this embodiment. Figure 4 is an enlarged cross-sectional view showing the drain port portion of the flushing water tank body 26 provided in the flushing water tank device 4 of this embodiment. Figure 5 is a top view of the flushing water tank body 26 provided in the flushing water tank device 4 of this embodiment.

As shown in Figures 1 and 2, the cleaning water tank device 4 includes a valve unit 24 for supplying and stopping cleaning water from the water supply, a resin cleaning water tank body 26 for storing the cleaning water supplied via the valve unit 24, and a drain valve 28 for discharging and stopping the cleaning water from the cleaning water tank body 26.

The valve unit 24 includes a solenoid valve 24a for tank water supply, a solenoid valve 24b for rim water discharge, etc., and is configured to control the supply and cessation of tap water supplied from the water supply to the washing water tank body 26, and the discharge and cessation of tap water from the rim discharge port 10.

As shown in Figure 3, the flushing water tank body 26 is configured to store flushing water for flushing the toilet body and is fixed to the toilet body 2 via a base plate 30. A drain valve 28 and a drain valve drive mechanism 32 are located inside the flushing water tank body 26. The drain valve drive mechanism 32 lifts the drain valve 28, opening it and discharging flushing water from the flushing water tank body 26. The flushing water discharged from the flushing water tank body 26 flows through an inlet 2a located on the rear upper surface of the toilet body 2 into a jet water channel 16 located inside the toilet body 2.

In this embodiment, the flushing water tank body 26 is a small resin tank with a volume of approximately 2 liters. As shown in Figure 2, the lower part of the flushing water tank body 26 is positioned below the upper surface of the rim portion 20 of the flush toilet body 2, and above the top portion 8d of the drain trap pipe 8. This results in a low-profile toilet system 1. Furthermore, in this embodiment, the flushing water in the flushing water tank body 26 is discharged from the jet outlet 14 by gravity.

As shown in Figure 3, the bottom surface of the cleaning water tank body 26 is provided with an annular projection 26a that protrudes downward. The inside of this annular projection 26a constitutes a drainage passage 26b that extends downward from the bottom surface of the cleaning water tank body 26. The circular opening at the lower end of this drainage passage 26b functions as the drain port of the cleaning water tank body 26. The diameter of this drain port is approximately the same as the diameter of the drainage opening 30a formed in the base plate 30, and the drainage passage 26b and the drainage opening 30a are smoothly connected. A groove 26c is formed on the outer circumferential surface of the projection 26a, and an annular O-ring 34 is fitted into this groove 26c.

On the other hand, the bottom surface of the base plate 30 is provided with a cylindrical portion 30b that protrudes downward, surrounding the drainage opening 30a. Furthermore, an annular upper recess 30c is formed on the upper surface of the base plate 30's bottom surface, surrounding the drainage opening 30a. Conversely, an annular lower recess 30d is formed on the lower surface of the base plate 30's bottom surface, surrounding the cylindrical portion 30b.

Furthermore, the protruding portion 26a, which extends from the bottom surface of the cleaning water tank body 26, is received within the upper surface recess 30c formed on the upper surface of the base plate 30. By fitting the protruding portion 26a of the cleaning water tank body 26 into the upper surface recess 30c of the base plate 30 in this way, the O-ring 34 positioned on the outer circumference of the protruding portion 26a is compressed radially in the drainage passage 26b, thereby sealing the space between the cleaning water tank body 26 and the base plate 30.

Meanwhile, a packing 36 is positioned within the annular lower recess 30d formed on the lower surface of the base plate 30. The packing 36 is annular in shape and is fitted around the cylindrical portion 30b formed on the inner circumference of the lower recess 30d, receiving it within the lower recess 30d. The base plate 30 is fixed to the rear upper surface of the toilet body 2 by multiple bolts 38 (only one is shown in Figure 3).

As a result, the packing 36, positioned in the lower recess 30d on the underside of the base plate 30, is compressed between the base plate 30 and the toilet bowl body 2. That is, when the flushing water tank body 26 is fixed to the toilet bowl body 2 via the base plate 30, the packing 36 is sandwiched and crushed between the lower recess 30d of the base plate 30 and the periphery of the inlet 2a on the upper surface of the toilet bowl body 2. This ensures watertightness between the base plate 30 and the toilet bowl body 2.

Next, as shown in Figure 4, the drainage passage 26b is a passage formed to extend downward from the bottom surface of the cleaning water tank body 26, and has a circular cross-section, with the flow path cross-sectional area narrowing towards the bottom. Furthermore, the inner wall surface of the drainage passage 26b is curved upward in a convex shape in the vertical cross-section shown in Figure 4. In addition, an annular seat surface 26d (Figure 5) is provided surrounding the inlet at the upper end of the drainage passage 26b. The seat surface 26d is a narrow annular surface, and the drain valve 28 sits on and off this seat surface 26d, thereby opening and closing the drain port of the cleaning water tank body 26, and the cleaning water is discharged and stopped.

Specifically, when flushing the bowl portion 6 of the toilet bowl body 2, the drain valve 28 is lifted by the drain valve drive mechanism 32 (Figure 3) from the closed position P1 (shown by a dashed line in Figure 4) to the open position P2 (shown by a dashed line). When the drain valve 28 is in the closed position P1 and seated on the seat surface 26d, the discharge of flushing water from the flushing water tank body 26 is stopped. Then, when the drain valve 28 moves to the open position P2 and lifts off the seat surface 26d, flushing water is discharged from the flushing water tank body 26.

Furthermore, as shown in Figures 4 and 5, a flow guide section 40 is provided at the bottom of the washing water tank body 26, surrounding the periphery of the sheet surface 26d. This flow guide section 40 is a surrounding wall surface that rises vertically from the outside of the sheet surface 26d, surrounding the sheet surface 26d, and is formed concentrically with the circular sheet surface 26d. By providing this flow guide section 40, the flow velocity of the washing water towards the center C of the drainage passage 26b within the washing water tank body 26 is reduced.

Furthermore, as shown in Figure 4, the surrounding wall surface constituting the flow guide section 40 is configured such that its upper end is located above the tangent line L1 that contacts the inner wall surface of the drainage passage 26b at the entrance of the upper end of the drainage passage 26b. By configuring the flow guide section 40 in this way, the cleaning water flowing towards the center C of the drainage passage 26b near the bottom surface of the cleaning water tank body 26 hits the flow guide section 40 and is temporarily directed upward, thus reducing the velocity component of the cleaning water heading towards the center C of the drainage passage 26b.

Furthermore, in this embodiment, the surrounding wall surface constituting the flow guide section 40 is notched at four locations on the circumference. That is, as shown in Figure 5, the flow guide section 40 has four notches 40a provided at equal intervals on the circumference, and the height of the surrounding wall surface is reduced in those areas. In this way, in the areas where the notches 40a are provided, the velocity component of the washing water flowing from around the drain outlet toward the center C of the drain passage 26b is hardly reduced. Therefore, the magnitude of the average velocity component toward the center C of the drain passage 26b can be adjusted by changing the number and size of the notches 40a provided in the flow guide section 40.

Furthermore, as shown by the dashed line in Figure 4, when the drain valve 28 is raised to its highest open position P2, the vertical distance D1 from the upper end of the surrounding wall surface (flow guide section 40) to the lower surface of the drain valve 28 is more than half of the vertical distance D2 from the seat surface 26d to the lower surface of the drain valve 28. By setting this distance from the upper end of the flow guide section 40 to the drain valve 28, it is possible to ensure a sufficient flow path cross-sectional area between the flow guide section 40 and the drain valve 28 while providing the flow guide section 40 around the seat surface 26d.

Next, the operation of the flush toilet device 1 according to an embodiment of the present invention will be described.
First, when the user performs the flushing operation of the flush toilet device 1, a controller (not shown) provided in the flush toilet device 1 sends a control signal to the rim water discharge solenoid valve 24b (Figure 1) of the valve unit 24, causing it to open. As a result, the flushing water supplied from the water supply passes through the rim water discharge solenoid valve 24b and the rim water conduit 12 and is discharged from the rim water outlet 10. The flushing water discharged from the rim water outlet 10 forms a swirling flow on the waste receiving surface 18 of the bowl portion 6, cleaning the waste receiving surface 18.

After the rim water discharge solenoid valve 24b is opened, and a predetermined time has elapsed, the controller (not shown) sends a control signal to the drain valve drive mechanism 32 (Figure 3), which activates the motor (not shown) provided in the drain valve drive mechanism 32, lifting the drain valve 28 from the seat surface 26d of the flush water tank body 26. This opens the drain valve 28, and the flush water stored in the flush water tank body 26 flows through the drain passage 26b of the flush water tank body 26 to the inlet 2a (Figure 3) of the flush toilet body 2, and is discharged from the jet outlet 14 through the jet water conduit 16. The discharge from the jet outlet 14 induces a siphon effect in the drain trap pipe 8, and the flush water and waste in the bowl section 6 are discharged through the drain trap pipe 8.

Here, when the drain valve 28 is lifted from the seat surface 26d of the cleaning water tank body 26, the cleaning water inside the cleaning water tank body 26 immediately begins to flow towards the center C of the drain passage 26b (drain outlet). That is, at the moment the drain valve 28 is lifted, the cleaning water inside the cleaning water tank body 26 flows from the gap between the bottom surface of the drain valve 28 and the seat surface 26d towards the center C of the drain passage 26b, and then falls downwards within the drain passage 26b.

In this case, since a flow guide section 40 is provided around the annular seat surface 26d, the flow toward the center C of the drainage passage 26b, as shown by arrow F1 in Figure 4, is initially directed upward, overcoming the flow guide section 40, and then flows downward into the drainage passage 26b. The flow F1 of the cleaning water that flows over the flow guide section 40 into the drainage passage 26b then falls along the inner wall surface of the drainage passage 26b. As a result, at the moment the drain valve 28 is lifted from the seat surface 26d, the cleaning water in the cleaning water tank body 26 can flow smoothly into the drainage passage 26b. This allows for a significant increase in the instantaneous flow rate of cleaning water from the cleaning water tank body 26 into the jet water conduit 16.

In contrast, in the case of the cleaning water tank body 126 of the comparative example shown in Figure 6, where a flow guide section 40 is not provided around the seat surface 126d, the moment the drain valve 128 is lifted from the seat surface 126d, cleaning water flows at an extremely high velocity towards the center of the drain passage 126b through the gap between the bottom surface of the drain valve 128 and the seat surface 126d. As a result, the cleaning water that flows in through the gap between the drain valve 128 and the seat surface 126d flows almost horizontally, as shown by arrow F3 in Figure 6. Consequently, immediately after the drain valve 128 is lifted from the seat surface 126d, the cleaning water does not flow along the inner wall surface of the drain passage 126b, and the effective flow path cross-sectional area becomes narrower. This reduces the instantaneous flow rate immediately after the drain valve 128 is lifted. In other words, if the flow guide section 40 is not provided, the horizontal component of the cleaning water flow becomes too large, and immediately after the drain valve 128 is opened, the cleaning water flow separates from the inner wall surface of the drain passage 126b, creating a region B where cleaning water does not flow. As a result, the flow resistance when the cleaning water flows from the cleaning water tank body 126 into the drain passage 126b increases, and the instantaneous flow rate decreases.

On the other hand, in the flush toilet device 1 of this embodiment shown in Figure 4, when the drain valve 28 is opened, the flow of flushing water toward the center C of the drain passage 26b is temporarily directed upward by the flow guide unit 40, so that the horizontal component of the flushing water flow is appropriately reduced. Therefore, the flow of flushing water flowing into the drain passage 26b does not separate from the inner wall surface of the drain passage 26b, and the flushing water can flow smoothly along the inner wall surface of the drain passage 26b, thereby increasing the instantaneous flow rate.

Furthermore, as shown in Figure 4, in the flush toilet device 1 of this embodiment, a flow guide section 40 is provided on the bottom surface of the flush water tank body 26, and a notch 40a is provided in this flow guide section 40. In the portion where this notch 40a is provided, as indicated by arrow F2 in Figure 4, the flow of flush water from around the flow guide section 40 toward the center C of the drainage passage 26b is not directed upwards, but flows almost horizontally into the inside of the flow guide section 40. Therefore, the flush water that passes through the notch 40a proceeds toward the center C of the drainage passage 26b at a relatively high flow velocity, then merges with the flush water that has overflowed the flow guide section 40, and flows into the drainage passage 126b.

Thus, in the portion of the flow guide section 40 where a notch 40a is provided, the horizontal component of the flow velocity of the cleaning water increases, while in the portion that has passed over the flow guide section 40, the horizontal component of the flow velocity of the cleaning water decreases. Therefore, the average flow velocity of the cleaning water toward the center C of the drainage passage 26b can be adjusted by changing the size and number of notches 40a provided in the flow guide section 40. In this embodiment, the size and number of notches 40a provided in the flow guide section 40 are set so that the flow velocity of the cleaning water toward the center C of the drainage passage 26b is as high as possible, while preventing delamination from occurring on the inner wall surface of the drainage passage 126b.

In this manner, the drain valve 28 is lifted from the seat surface 26d, and flushing water is discharged from the jet outlet 14. After a predetermined time, the controller (not shown) sends a control signal to the rim water discharge solenoid valve 24b, causing it to close. This stops the discharge of water from the rim outlet 10, completing one toilet flush cycle.

According to the flush toilet device 1 of the present invention, a flow guide section 40 is provided at the bottom of the flush water tank body 26 to reduce the flow velocity of the flush water directed toward the center C of the drainage passage 26b within the flush water tank body 26. This reduces the horizontal component of the flow velocity of the flush water toward the center C of the drainage passage 26b. As a result, the flush water flowing out of the flush water tank body 26 flows more easily along the inner wall surface of the drainage passage 26b, which is located inside the seat surface 26d, and prevents the flush water from separating from the inner wall surface of the drainage passage 26b. This allows for a higher instantaneous flow rate of flush water flowing out of the flush water tank body 26, improving the flushing performance of the flush toilet body 2.

Furthermore, according to the flush toilet device 1 of this embodiment, since the flow guidance section 40 is composed of a surrounding wall surface provided on the outside of the seat surface 26d so as to surround the seat surface 26d, the flushing water directed toward the center C of the seat surface 26d flows over the surrounding wall surface, thereby reducing the horizontal component of the flow velocity of the flushing water toward the center of the seat surface 26d.

Furthermore, according to the flush toilet device 1 of this embodiment, since the upper end of the flow guide section 40 is located above the tangent L1 (Figure 4) of the inlet of the drainage passage 26b in the vertical cross-section, the flushing water directed toward the center C of the seat surface 26d needs to overcome the higher flow guide section 40, and the horizontal component of the flow velocity toward the center C of the seat surface 26d can be sufficiently reduced.

Furthermore, according to the flush toilet device 1 of this embodiment, when the drain valve 28 is raised to its highest position, the vertical distance D1 (Figure 4) from the upper end of the surrounding wall surface (flow guide section 40) to the drain valve 28 is more than half of the vertical distance D2 from the seat surface 26d to the drain valve 28. Therefore, a sufficient flow path cross-sectional area for flushing water can be secured between the upper end of the surrounding wall surface and the drain valve 28. This avoids a decrease in instantaneous flow rate due to the presence of the surrounding wall surface.

Furthermore, in the flush toilet device 1 of this embodiment, a portion of the surrounding wall surface (flow guide section 40) enclosing the seat surface is cut out (Figures 4 and 5). Therefore, a relatively large horizontal component of the flow velocity is maintained in the cut-out portion (cut-out section 40a), and the horizontal component of the flow velocity toward the center of the seat surface 26d can be adjusted by the size of the cut-out.

The embodiments of the present invention have been described above, but various modifications can be made to the embodiments described above.

For example, in the embodiment described above, the surrounding wall surface constituting the flow guide section was configured separately from the side wall surface of the washing water tank body. However, as shown in Figure 7, a portion of the surrounding wall surface can be integrated with the side wall surface of the washing water tank body. That is, in the modified example shown in Figure 7, a surrounding wall surface 52 is provided as a flow guide section, surrounding the periphery of the seat surface 50a of the washing water tank body 50. This surrounding wall surface 52 is provided concentrically with the annular seat surface 50a, and a portion of it is integrated with one of the side wall surfaces 50b of the washing water tank body 50. Even when a portion of the surrounding wall surface 52 is integrated with the side wall surface 50b of the washing water tank body 50, the surrounding wall surface 52 can reduce the horizontal component of the flow velocity toward the center C of the seat surface 50a, thereby increasing the instantaneous flow rate of washing water flowing through the drainage passage 50c.

1 Flush toilet device 2 Flush toilet body 2a Inlet 4 Flush water tank device 6 Bowl section 8 Drain trap pipe 8a Inlet section 8b Rising pipe 8c Downward pipe 8d Top section 10 Rim outlet 12 Rim water channel 14 Jet outlet 16 Jet water channel 16a Upstream channel 16b Bent channel 16c Downstream channel 18 Waste receiving surface 20 Rim section 21 Shelf section 22 Bowl section 24 Valve unit 24a Solenoid valve for tank water supply 24b Solenoid valve for rim water discharge 26 Flush water tank body 26a Protruding section 26b Drainage passage 26c Groove 26d Seat surface 28 Drain valve 30 Base plate 30a Drainage opening 30b Cylindrical section 30c Upper recess 30d Lower recess 32 Drain valve drive mechanism 34 O-ring 36 Packing 38 Bolt 40 Flow guide section (enclosing wall surface)
40a Notch 50 Washing water tank body 50a Seat surface 50b Side wall surface 50c Drainage passage 52 Enclosing wall surface 126 Washing water tank body 126b Drainage passage 126d Seat surface 128 Drain valve

Claims (5)

A flushing water tank device for supplying flushing water to the main body of a flush toilet,
A washing water tank body for storing washing water,
A drainage passage is formed to extend downward from the bottom surface of the washing water tank body,
An annular sheet surface is provided to surround the entrance of this drainage passage,
A drain valve that, when a person sits on or leaves this seat surface, causes the cleaning water to be discharged from the cleaning water tank body and stops,
It has,
At the bottom of the washing water tank body, a flow guide is provided to reduce the flow velocity of the washing water towards the center of the drainage passage within the washing water tank body .
The above-mentioned flow guidance section is a surrounding wall surface provided on the outside of the sheet surface so as to surround the sheet surface, and its upper end is located above the tangent to the inlet of the drainage passage in a vertical cross-section, characterized in that the washing water tank device is such that the flow guidance section is a surrounding wall surface provided on the outside of the sheet surface, and its upper end is located above the tangent to the inlet of the drainage passage in a vertical cross -section. The washing water tank device according to claim 1, wherein the drain valve is configured to be pulled upward from the seat surface, and when the drain valve is pulled up to its maximum extent, the vertical distance from the upper end of the surrounding wall surface to the drain valve is more than half the vertical distance from the seat surface to the drain valve . The washing water tank device according to claim 1 , wherein a portion of the surrounding wall surface that surrounds the sheet surface is cut out. The washing water tank device according to claim 1 , wherein a portion of the surrounding wall surface constituting the flow guidance section is integrated with the wall surface constituting the washing water tank body. A flush toilet device that is cleaned with flushing water,
The toilet unit and
A flushing water tank device according to any one of claims 1 to 4 is provided at the rear of the flushing toilet body to supply flushing water to the flushing toilet body,
A flush toilet device characterized by having the following features.