JP7611670B2 - Toilet - Google Patents

Description

This disclosure relates to a toilet.

Conventionally, flush toilets are known in which flush water discharged from a spout swirls inside the toilet bowl and discharges waste into a drain trap. For example, the following Patent Document 1 describes a toilet in which flush water discharged from a spout flows over a waste receiving surface into a basin, and is then discharged from a drain in the basin into a drain trap pipe.

JP 2020-51054 A

There is a demand for improved discharge performance for toilets like the one above, to prevent waste from remaining in the basin.

This disclosure was completed based on the above circumstances, and aims to provide a toilet that can improve waste discharge performance.

The toilet bowl of the present disclosure comprises a toilet bowl portion and a drain trap portion extending rearward from an inlet formed in the toilet bowl portion, the toilet bowl portion having a rim portion, a bowl portion and a recessed portion, the rim portion forms the upper edge of the toilet bowl portion, the bowl portion extends inwardly and downwardly from the lower edge of the rim portion, the recessed portion has a standing wall portion extending downward from the lower edge of the bowl portion and a bottom portion having the inlet formed at the rear, the rim portion is provided with a water outlet that discharges water to form a swirling flow in either a clockwise or counterclockwise direction when viewed from above in a plan view of the toilet bowl portion, the water outlet being provided from the rear of a first side of the toilet bowl portion where the swirling flow flows forward, to the rear of a second side of the toilet bowl portion where the swirling flow flows forward, It is arranged in a region up to the front of the second side on the opposite side, and in a plan view of the pooled water surface of the recess from above, a line passing through the center of the pooled water surface in the left-right direction is a virtual vertical line, a line passing through the center of the pooled water surface in the front-to-back direction is a virtual horizontal line, the point where the virtual vertical line and the virtual horizontal line intersect is a center point, and two lines passing through the center point at angles of 45 degrees to the virtual vertical line and the virtual horizontal line are virtual diagonal lines, and when the pooled water surface is divided into four by the virtual diagonal lines, the front region is the front region, the rear region is the rear region, the region located on the first side of the left and right regions is the first region, and the region located on the second side of the left and right regions is the second region, more than half of the amount of flush water discharged from the water outlet flows into the first region.

A vertical cross-sectional view of a toilet Cross-sectional view of a toilet Horizontal cross-sectional view of a toilet FIG. 1 is a first schematic plan view for explaining the flow of cleaning water; FIG. 2 is a second schematic plan view for explaining the flow of cleaning water; FIG. 3 is a third schematic plan view for explaining the flow of cleaning water; FIG. 4 is a fourth schematic plan view for explaining the flow of cleaning water;

<Embodiment>
The toilet 10 is a siphon type toilet. As shown in Fig. 1, the toilet 10 comprises a toilet bowl 11, a drain trap 12, a peripheral wall 13, and a support wall 14. Below, each component will be described with the positive side of the X axis in Fig. 1 (the front side when the orientation of a person sitting on the toilet 10 in a normal position is used as a reference) as the front side, the negative side of the X axis in Fig. 1 as the rear side, the positive side of the Y axis in Fig. 1 as the upper side, the negative side of the Y axis in Fig. 1 as the lower side, the positive side of the Z axis in Fig. 2 (the right side when the toilet 10 is viewed from the front) as the right side, and the negative side of the Z axis in Fig. 2 (the left side when the toilet 10 is viewed from the front) as the left side.

As shown in FIG. 1, the toilet bowl 11 includes a rim 15, a bowl 16, and a recess 17. The rim 15 forms the upper periphery of the toilet bowl 11. As shown in FIG. 3, the rim 15 is provided with a first water outlet 18 and a second water outlet 19. The first water outlet 18 and the second water outlet 19 discharge flushing water to form a counterclockwise swirling flow in a plan view of the toilet bowl 11 from above. The flushing water discharged from the first water outlet 18 (referred to as first flushing water 71) and the flushing water discharged from the second water outlet 19 (referred to as second flushing water 72) flow forward on the left side of the toilet bowl 11 and backward on the right side of the toilet bowl 11. The left side of the toilet bowl 11 corresponds to the first side. The right side of the toilet bowl 11 corresponds to the second side.

As shown in FIG. 3, the first water outlet 18 is disposed in a region from the rear of the left side of the toilet bowl 11 to the front of the right side in a plan view of the toilet bowl 11 viewed from above. Specifically, the first water outlet 18 is disposed in the center of the left side of the toilet bowl 11 in the front-to-rear direction. The first water outlet 18 is disposed in a position overlapping with a first region 42 described later in the left-to-right direction. In other words, the first water outlet 18 is disposed in a range rearward of the front end of the first region 42 described later in the rim portion 15 and forward of the rear end of the first region 42. The first water outlet 18 opens forward. The first flushing water 71 is discharged forward from the first water outlet 18.

As shown in FIG. 3, the second water outlet 19 is located toward the right side of the rear of the toilet bowl 11. The second water outlet 19 opens toward the left. The second flush water 72 is discharged toward the left from the second water outlet 19. The flow rate of the second flush water 72 is slower than the flow rate of the first flush water 71. The amount of the second flush water 72 discharged in one flush is less than the amount of the first flush water 71. Specifically, the ratio of the amount of the first flush water 71 discharged to the amount of the second flush water 72 discharged is in the range of 6.5:3.5 to 7.0:3.0.

As shown in FIG. 3, the rim portion 15 is provided with a collision wall 21. The collision wall 21 is disposed on the left side of the rear of the toilet bowl portion 11. The collision wall 21 faces the second water outlet 19. The first flush water 71 and the second flush water 72 that pass through the rear of the toilet bowl portion 11 collide with the collision wall 21 and change the flow direction inward (toward the front).

As shown in FIG. 3, the front portion 23 of the vertical surface 22 of the rim portion 15 is curved with little change in curvature when viewed from above in a plan view. This allows the first flush water 71 and the second flush water 72 to flow smoothly in the circumferential direction around the toilet bowl portion 11. The front portion 23 of the vertical surface 22 of the rim portion 15 extends from the front surface of the rim portion 15 to the center in the front-to-rear direction on both the left and right sides. The radius of curvature of the front portion 23 of the vertical surface 22 of the rim portion 15 is greater than the radius of curvature of the rear portion of the vertical surface 22. The radii of curvature of the front portion 23 of the vertical surface 22 of the rim portion 15 are approximately equal.

As shown in FIG. 2, the bowl portion 16 extends downward and inward from the lower edge of the vertical surface 22 of the rim portion 15. The bowl portion 16 is inclined at an angle closer to the horizontal than the vertical surface 22 of the rim portion 15.

As shown in Figures 1 and 2, the recess 17 has a standing wall portion 24 and a bottom portion 25. The standing wall portion 24 extends downward from the lower edge of the pot portion 16. The standing wall portion 24 is inclined at an angle closer to vertical than the pot portion 16. The height dimension of the front standing wall portion 24 is smaller than the height dimension of the rear standing wall portion 24. The upper edge of the standing wall portion 24 rises toward the rear. The height dimensions of the left and right standing wall portions are the same (see Figure 2).

As shown in FIG. 1, the bottom 25 is inclined at an angle closer to horizontal than the standing wall 24. An inlet 26 to the drain trap section 12 is formed at the rear of the bottom 25. The inlet 26 opens to the upper side. The inlet 26 is provided in the center of the bottom 25 in the left-right direction.

As shown in FIG. 1, the drain trap section 12 extends rearward from the inlet 26. The drain trap section 12 has a descending passage 27 and an ascending passage 28. The descending passage 27 extends rearward and downward from the inlet 26. The ascending passage 28 extends rearward and upward from the downstream end of the descending passage 27.

As shown in FIG. 1, accumulated water 29 is stored in the lower part of the recess 17 and the drain trap section 12. The upper surface of the accumulated water 29 in the standby state (referred to as the accumulated water surface 31) is determined by the height of the highest point 32 of the lower surface of the drain trap section 12. When viewed from above, the accumulated water surface 31 is a roughly ellipse with a large dimension in the front-to-rear direction, as shown in FIG. 3.

As shown in FIG. 3, the pooled water surface 31 is divided into multiple regions by an imaginary vertical line L1, an imaginary horizontal line L2, and two imaginary diagonal lines L3, and the flow of the first cleaning water 71 and the second cleaning water 72 is explained. The imaginary vertical line L1, the imaginary horizontal line L2, and the imaginary diagonal lines L3 are parallel to the pooled water surface 31.

In a plan view of the pooled water surface 31 seen from above, the imaginary vertical line L1 passes through the center in the left-right direction of the pooled water surface 31. In a plan view of the pooled water surface 31 seen from above, the imaginary horizontal line L2 passes through the center in the front-to-back direction of the pooled water surface 31. The imaginary vertical line L1 and the imaginary horizontal line L2 are perpendicular to each other. In a plan view of the pooled water surface 31 seen from above, the imaginary diagonal line L3 forms an angle of 45 degrees with the imaginary horizontal line L2 and the imaginary vertical line L1. The imaginary diagonal line L3 passes through the intersection (called the center point D) of the imaginary vertical line L1 and the imaginary horizontal line L2.

As shown in FIG. 3, the pooled water surface 31 is divided into four regions by an imaginary diagonal line L3. The four regions are a front region 40, a rear region 41, a first region 42, and a second region 43. The front region 40 is the region in front of the pooled water surface 31. The rear region 41 is the region in rear of the pooled water surface 31. The first region 42 is the region on the left side of the pooled water surface 31. The second region 43 is the region on the right side of the pooled water surface 31.

As shown in FIG. 3, the water surface 31 is divided into eight regions by an imaginary vertical line L1, an imaginary horizontal line L2, and two imaginary diagonal lines L3. The eight regions are obtained by dividing the front region 40, the rear region 41, the first region 42, and the second region 43 into two. The eight regions are the front left region 40A, the front right region 40B, the rear left region 41A, the rear right region 41B, the first front region 42A, the first rear region 42B, the second front region 43A, and the second rear region 43B.

The front left region 40A is the region on the left side of the front region 40. The front right region 40B is the region on the right side of the front region 40. The rear left region 41A is the region on the left side of the rear region 41. The rear right region 41B is the region on the right side of the rear region 41. The first front region 42A is the region in front of the first region 42. The first rear region 42B is the region behind the first region 42. The second front region 43A is the region in front of the second region 43. The second rear region 43B is the region behind the second region 43.

As shown in FIG. 3, the rim portion 15 is divided into four regions by imaginary diagonal lines L3. The four regions are a rim front region 15A, a rim rear region 15B, a rim first region 15C, and a rim second region 15D. The rim front region 15A is the region in front of the rim portion 15. The rim rear region 15B is the region in the rear of the rim portion 15. The rim first region 15C is the region on the left side of the rim portion 15. The rim second region 15D is the region on the right side of the rim portion 15. The first water outlet 18 is provided in the rim first region 15C.

As shown in FIG. 3, the bowl portion 16 is divided into four regions by an imaginary diagonal line L3. The four regions are a bowl portion front region 60, a bowl portion rear region 61, a bowl portion first region 62, and a bowl portion second region 63. The bowl portion front region 60 is the region in front of the bowl portion 16. The bowl portion rear region 61 is the region in the rear of the bowl portion 16. The bowl portion first region 62 is the region on the left side of the bowl portion 16. The bowl portion second region 63 is the region on the right side of the bowl portion 16.

The flow of the first flush water 71 and the second flush water 72 will be explained. As shown in FIG. 3, the first flush water 71 starts to be discharged from the first water outlet 18. The first flush water 71 is discharged forward from the first water outlet 18. The second flush water 72 starts to be discharged from the second water outlet 19. The second flush water 72 is discharged leftward from the second water outlet 19. The first flush water 71 forms a first water flow 73. The first water flow 73 passes through the first bowl region 62, the front bowl region 60, and the second bowl region 63, reaches the rear bowl region 61, and merges with the second flush water 72.

The second washing water 72 forms a second water flow 75 and a third water flow 76, as shown in FIG. 4. The second water flow 75 flows into the first region 42 of the pool surface 31. Most of the second water flow 75 flows into the first front region 42A. The third water flow 76 passes through the first basin region 62 and the front basin region 60, and as shown in FIG. 5, loses momentum to the right of the front basin region 60 and flows into the front region 40 of the pool surface 31. Most of the third water flow 76 flows into the front right region 40B of the pool surface 31.

The merged water 74, which is the merged water of the first flush water 71 and the second flush water 72, forms a fourth water flow 77 and a fifth water flow 78, as shown in FIG. 5. The fourth water flow 77 reaches the first region 62 from the rear region 61 of the bowl and flows into the first region 42. Most of the fourth water flow 77 flows into the first front region 42A. The fifth water flow 78 flows inside the first water flow 73 and makes one revolution around the toilet bowl 11. Specifically, as shown in FIG. 6, the fifth water flow 78 passes from the rear region 61 of the bowl to the first region 62, the front region 60 of the bowl, and the second region 63 of the bowl, reaches the rear region 61 of the bowl, and reaches the lower part (inside) of the second water outlet 19. The flow velocity of the fifth water flow 78 (flow velocity of the merged water 74) is faster than the flow velocity of the second flush water 72. As shown in FIG. 7, the fifth water flow 78 merges with the second flush water 72 and flows into the first region 42 of the pool surface 31. Most of the fifth water flow 78 flows into the first front region 42A. As shown in FIG. 6 and FIG. 7, a part of the fifth water flow 78 branches to form a sixth water flow 78A. The sixth water flow 78A flows into the second region 43. Most of the sixth water flow 78A flows into the second rear region 43B. The amount of the sixth water flow 78A flowing into the second region 43 is less than the amount of the second water flow 75, the fourth water flow 77, and the fifth water flow 78 flowing into the first region 42. However, the flow of the sixth water flow 78A into the second region 43 has the effect of washing away the waste in the recess 17 into the drain trap portion 12.

As shown in FIG. 7, a large amount of washing water consisting of the second water flow 75, the fourth water flow 77, and the fifth water flow 78 flows vigorously into the recess 17 from the left of the recess 17 diagonally toward the front right. The washing water consisting of the sixth water flow 78A flows vigorously into the recess 17 from the right of the recess 17 diagonally toward the rear left. The large amount of washing water that flows into the recess 17 forms a thick flow 79 along the standing wall 24 of the recess 17, and becomes a vortex flow from the front to the rear of the recess 17. As the first washing water 71 and the second washing water 72 flow into the pooled water surface 31, the water level of the pooled water 29 rises from the pooled water surface 31, and the siphon is activated. The waste in the recess 17 is swept away from the inlet 26 into the drain trap section 12 by the thick flow 79 formed by the large amount of washing water and the siphon action. The water level of the pooled water 29 falls, and when it falls below the lowest point 33 of the upper surface of the drain trap section 12, air enters and breaks the seal. After that, the water level of the pooled water 29 returns to the pooled water surface 31.

More than half of the discharged water volume of the first washing water 71 from the start of discharge to the start of siphoning forms the fourth water flow 77 and the fifth water flow 78 and flows into the first region 42. The amount of the discharged water volume of the first washing water 71 that forms the fourth water flow 77 and the fifth water flow 78 and flows into the first front region 42A is greater than the amount of the first washing water 71 that flows into each of the other seven regions. More than half of the total amount of the discharged water volume of the first washing water 71 and the second washing water 72 forms the second water flow 75, the fourth water flow 77 and the fifth water flow 78 and flows into the first region 42. The amount of the discharged water volume of the first washing water 71 that flows into the front region 40 is the smallest among the front region 40, the rear region 41, the first region 42 and the second region 43.

The operation and effects of the embodiment configured as described above are explained below.

The toilet bowl 10 comprises a toilet bowl portion 11 and a drain trap portion 12. The drain trap portion 12 extends rearward from an inlet 26 formed in the toilet bowl portion 11. The toilet bowl portion 11 comprises a rim portion 15, a bowl portion 16, and a recess 17. A first water outlet 18 is provided in the rim portion 15. The first water outlet 18 discharges water to form a swirling flow counterclockwise in a plan view of the toilet bowl portion 11 seen from above. The first water outlet 18 is positioned in the area from the rear left side of the toilet bowl portion 11 to the front right side of the toilet bowl portion 11 in a plan view of the toilet bowl portion 11 seen from above. On the left side of the toilet bowl portion 11, the swirling flow flows forward. In a plan view of the pool surface 31 of the recess 17 from above, the pool surface 31 is divided into four areas by an imaginary diagonal line L3; out of the front area 40, rear area 41, first area 42, and second area 43, more than half of the amount of first flush water 71 discharged from the first water outlet 18 flows into the first area 42.

With this configuration, a large amount of flushing water flows into the first region 42 of the water pool surface 31, forming a thick stream in the recess 17. The thick stream of waste material is discharged from the recess 17 into the drain trap section 12. This improves waste material discharge performance.

The toilet 10 is a siphon toilet. More than half of the amount of first flush water 71 discharged from the first water outlet 18 until the siphon starts flows into the first area 42. With this configuration, waste is discharged from the recess 17 into the drain trap section 12 by the siphon action and the thick flow formed by the large amount of flush water. This can therefore further improve waste discharge performance.

Of the first flushing water 71 that flows into each of the eight regions that divide the water pool surface 31 by an imaginary vertical line L1, an imaginary horizontal line L2, and two imaginary diagonal lines L3, the amount of first flushing water 71 that flows into the first front region 42A is the largest. With this configuration, a large amount of flushing water flows into the first front region 42A of the first region 42, forming a thick stream in the recess 17. Waste is discharged from the recess 17 into the drain trap section 12 by the thick stream. This can further improve the discharge performance of waste.

The first flush water 71 passes through the rear of the toilet bowl 11 and flows into the first area 42. This configuration can prevent waste from remaining at the rear of the toilet bowl 11.

Of the amounts of first flush water 71 flowing into the front region 40, the rear region 41, the first region 42, and the second region 43, the amount of first flush water 71 flowing into the front region 40 is the smallest. With this configuration, most of the first flush water 71 passes through the front part of the toilet bowl 11, which prevents waste from remaining in the front part of the toilet bowl 11.

The second flush water 72 merges with the first flush water 71 and reaches the inside of the second water outlet 19. The inside of the second water outlet 19 is located closer to the center point D of the second water outlet 19 in a plan view of the toilet bowl 11 from above. With this configuration, the second flush water 72 goes around the toilet bowl 11 once, which prevents waste from remaining in the toilet bowl 11.

The combined water 74, which is the combination of the first flush water 71 and the second flush water 72, travels around the toilet bowl 11. This configuration can prevent waste from remaining in the toilet bowl 11.

The flow rate of the combined water 74 is faster than the flow rate of the second flush water 72. With this configuration, the second flush water 72 merges with the combined water 74 to form a thick stream that can clean the toilet bowl 11.

<Other embodiments>
The present disclosure is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included within the technical scope of the present disclosure.
(1) In the above embodiment, the toilet 10 is a siphon toilet. However, the toilet is not limited to this and may be a wash-down toilet.
(2) In the above embodiment, the first water outlet 18 and the second water outlet 19 spout water to form a swirling flow in a counterclockwise direction. However, the present invention is not limited to this. The positions and the water outlet direction of the first water outlet and the second water outlet may be changed to spout water to form a swirling flow in a clockwise direction.
(3) In the above embodiment, the first area 42 is the area on the left side of the water pool surface 31, and the second area 43 is the area on the right side of the water pool surface 31. This is not intended to be limiting, and in a case where the swirling flow in the toilet bowl flows clockwise, the first area is the area on the right side of the water pool surface, and the second area is the area on the left side of the water pool surface.
(4) In the above embodiment, the first water outlet 18 is disposed in the center in the front-to-rear direction on the left side of the toilet bowl 11. The position of the first water outlet may be changed as appropriate without being limited to this. When the swirling flow flows counterclockwise, the first water outlet may be disposed, for example, on the right side of the toilet bowl, or in the front or rear of the toilet bowl.
(5) In the above embodiment, the first water outlet 18 is disposed in a position that overlaps with the first region 42 in the left-right direction. This is not limiting, and the first water outlet may be disposed in a position that does not overlap with the first region in the left-right direction.
(6) In the above embodiment, the rim portion 15 is provided with the second water outlet 19. However, the present invention is not limited to this, and the second water outlet does not have to be provided on the rim portion.
(7) In the above embodiment, two water outlets (the first water outlet 18 and the second water outlet 19) are provided in the rim portion 15. However, this is not limited to this, and three or more water outlets may be provided in the rim portion.

D...center point, L1...imaginary vertical line, L2...imaginary horizontal line, L3...imaginary diagonal line, 10...toilet bowl, 11...toilet bowl, 12...drain trap, 15...rim, 16...bowl, 17...recess, 18...first water outlet, 19...second water outlet, 24...standing wall, 25...bottom, 26...inlet, 31...water surface, 40...front area, 41...rear area, 42...first area, 42A...first front area, 42B...first rear area, 43...second area, 15C...rim first area (area located on the first side), 71...first flush water, 72...second flush water, 74...merged water

Claims (16)

The toilet comprises a toilet bowl portion and a drain trap portion extending rearward from an inlet formed in the toilet bowl portion,
The toilet bowl portion includes a rim portion, a bowl portion, and a recessed portion,
The rim portion forms an upper peripheral edge of the toilet bowl,
The bowl portion extends downward and inward from a lower edge of the rim portion,
The recess has a standing wall portion extending downward from a lower edge of the pot portion and a bottom portion having the inlet formed at a rear portion thereof,
The rim portion is provided with a water outlet that discharges water so as to form a swirling flow in either a clockwise or counterclockwise direction when the toilet bowl is viewed from above in a plan view,
The water outlet is disposed in a region from a rear part of a first side, on one of the left and right sides of the toilet bowl, along which the swirling flow flows forward, to a front part of a second side, on the other of the left and right sides of the toilet bowl, opposite to the first side, in a plan view of the toilet bowl from above;
In a plan view of the pooled water surface of the recess from above, a line passing through the center of the pooled water surface in the left-right direction is defined as a virtual vertical line, a line passing through the center of the pooled water surface in the front-to-back direction is defined as a virtual horizontal line, a point where the virtual vertical line and the virtual horizontal line intersect is defined as a center point, and two lines passing through the center point at angles of 45 degrees to the virtual vertical line and the virtual horizontal line are defined as virtual diagonal lines,
When the water collecting surface is divided into four by the imaginary diagonal lines, the front region is the front region, the rear region is the rear region, the region of the left and right regions located on the first side is the first region, and the region of the left and right regions located on the second side is the second region, more than half of the amount of flush water discharged from the spout flows into the first region and forms a thick stream along the upright wall portion, flowing from the front of the recess toward the inlet, and a portion of the flush water flows into the second region and flows toward the inlet . The toilet according to claim 1, which is a siphon toilet, and more than half of the flush water discharged from the start of water discharge from the water discharge port until the siphon starts flows into the first area. When the pooled water surface is divided into eight sections by the imaginary vertical line, the imaginary horizontal line, and the two imaginary diagonal lines, the area in front of the first area is defined as a first front area, and the area in rear of the first area is defined as a first rear area,
The toilet according to claim 1 or 2, wherein, of the flush water discharge amounts flowing into the eight regions, the flush water discharge amount flowing into the first front region is the largest. A toilet according to any one of claims 1 to 3, wherein the flush water passes through the rear of the toilet bowl and flows into the first area. The toilet according to any one of claims 1 to 4, wherein the water outlet is provided in an area located on the first side of four areas defined by the imaginary diagonal lines dividing the rim when the toilet bowl is viewed from above. The toilet according to any one of claims 1 to 5, wherein the amount of flush water flowing into the front region is the smallest among the amounts of flush water flowing into the front region, the rear region, the first region, and the second region. The water outlet is a first water outlet,
The cleaning water is a first cleaning water,
The rim portion is provided with a second water outlet that discharges second flush water so as to form a swirling flow in the same direction as the swirling flow discharged from the first water outlet,
A toilet bowl as described in any one of claims 1 to 6, wherein the second water outlet is located in an area different from the area in which the first water outlet is located among the four areas divided by the imaginary vertical and horizontal lines when the toilet bowl is viewed in a plan view from above. The toilet according to claim 7, wherein more than half of the combined discharge amount of the first flush water and the second flush water flows into the first area. The toilet according to any one of claims 7 to 8, wherein the amount of the second flush water discharged is less than the amount of the first flush water discharged. The toilet according to any one of claims 7 to 9, wherein the second flush water merges with the first flush water and reaches the inside of the second water outlet. The toilet according to any one of claims 7 to 10, wherein the combined water of the first flush water and the second flush water flows around the toilet bowl once. The toilet according to any one of claims 7 to 11, wherein the flow rate of the combined water of the first flush water and the second flush water is faster than the flow rate of the second flush water. 13. The toilet according to any one of claims 1 to 12, wherein the standing wall portion is inclined at an angle closer to vertical than the bowl portion. A toilet as described in any one of claims 1 to 13, wherein the height dimension of the front standing wall portion is smaller than the height dimension of the rear standing wall portion, and the upper edge of the standing wall portion rises from the front to the rear. 15. The toilet according to any one of claims 1 to 14, wherein the flush water flows into the first area in a forward direction. 16. The toilet according to claim 1, wherein the flush water flows rearwardly into the second area.

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