JP2023102350A - toilet bowl - Google Patents

Abstract

To provide a toilet bowl that can contain well the splash of washing water.SOLUTION: A toilet bowl 1 comprises an excreta bowl part 11 and a washing water distribution pipe 12. The excreta bowl part 11 comprises a rim part 11A and a recess part 11C. The rim part 11A being arranged at the upper end of the excreta bowl part 11 comprises a rim internal surface 11D. The recess part 11C is arranged at the lower end of the excreta bowl part 11. The washing water distribution pipe 12 discharges washing water into the excreta bowl part 11. The washing water discharged from the washing water distribution pipe 12 flows into the recess part 11C forming at least two streams, that is, a first main stream F1 that circles along the rim internal surface 11D and a second main stream F2 that flows down towards the recess part 11C. In the excreta bowl part 11, whereas the vertical positions of the first main stream F1 and the second main stream F2 are different from each other before flowing into the recess part 11C, a stream F22 that is a part of the second main stream F2 before flowing into the recess part 11C joins the first main stream F1.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to toilet bowls.

Patent Document 1 discloses a flush toilet provided with a first spout and a second spout. In this device, the wash water flowing from the first spout through the water passage in the toilet bowl and the wash water spouted from the second spout intersect and merge after passing through positions shifted in the height direction.

JP 2016-89431 A

The cleansing water spouted from the first spout tends to be more vigorously spouted than the cleansing water spouted from the second spout because it causes the water passage part to swirl, and splashes are likely to occur. Therefore, a technique for suppressing splashes from washing water has been desired.

The present disclosure has been made in view of the above-described conventional circumstances, and an object thereof is to provide a toilet that can satisfactorily suppress splashes from flush water.

The toilet bowl of the present disclosure includes:
A toilet bowl portion having a rim portion provided at an upper end portion and having a rim inner wall surface, and a recess portion provided at a lower end portion; The front, first main stream, and the second main stream are positioned at different positions in the vertical direction, and part of the second main stream before flowing into the recess joins the first main stream.

1 is a side cross-sectional view of the toilet bowl of Embodiment 1. FIG. Fig. 2 is a perspective view of the toilet bowl of Embodiment 1 as seen from the upper front; Fig. 2 is a partially broken plan view of the toilet bowl of Embodiment 1; 4 is a cross-sectional view taken along line AA in FIG. 3; FIG. FIG. 4 is a partially broken plan view for explaining the action of the toilet bowl of Embodiment 1; It is a graph which shows an example of the change of the flow volume of a 1st main stream and a 2nd main stream. FIG. 4 is an enlarged plan view of a main part for explaining the operation of the toilet bowl of Embodiment 1; FIG. 4 is an enlarged side cross-sectional view of a main part for explaining the action of the toilet bowl of Embodiment 1; Fig. 10 is a plan view of a toilet in another embodiment;

<Embodiment 1>
A first embodiment embodying the toilet bowl of the present disclosure will be described below with reference to FIGS. 1 to 8. FIG.

As shown in FIGS. 1 to 3, the toilet bowl 1 of Embodiment 1 includes a toilet bowl portion 11, a water supply portion 13, and a washing water pipe 12 which is a water discharge portion. In the following description, the vertical direction is the vertical direction when the toilet bowl 1 is installed on a horizontal installation surface. Regarding the front-rear direction, when the toilet bowl 1 is installed on a horizontal installation surface, the direction in which the tank mounting portion 13B is provided with respect to the toilet bowl portion 11 is the rear side, and the opposite direction is the front side. The left-right direction is the left-right direction viewed from the front when the toilet bowl 1 is installed on a horizontal installation surface. 1 to 5, 7, and 8, the upward direction is the positive direction of the X-axis, the downward direction is the negative direction of the X-axis, the forward direction is the positive direction of the Z-axis, the backward direction is the negative direction of the Z-axis, the left direction is the positive direction of the Y-axis, and the right direction is the negative direction of the Y-axis.

<Structure of Toilet Bowl>
The toilet bowl portion 11 includes a rim portion 11A, a waste receiving surface 11B, and a recessed portion 11C. The rim portion 11</b>A forms the upper edge of the toilet bowl portion 11 . The rim portion 11A has a rim inner wall surface 11D. The rim inner wall surface 11D is formed to have an annular shape and rise. In plan view, the radius of curvature of the front end portion of the rim inner wall surface 11D is smaller than the radius of curvature of the rear end portion. In plan view, the rim inner wall surface 11D has a substantially elliptical shape. A rim spout 11E is formed on the left side of the rear end of the rim inner wall surface 11D (see FIG. 2). The rim spout 11E is elongated in the left-right direction (see FIG. 2).

The outer edge of the dirt receiving surface 11B is continuous with the lower end of the rim inner wall surface 11D via the outer connecting surface C1. The filth receiving surface 11B is formed in a mortar shape. The waste receiving surface 11B is formed so as to be inclined downward toward the central portion in the vertical direction and the central portion in the horizontal direction. The front end portion of the outer connecting surface C1 is composed of a plurality of different surfaces that are continuous in the front-rear direction. The radius of curvature R3 of the outer connecting surface C1 in a side cross section obtained by cutting the toilet bowl 1 vertically in the center in the horizontal direction is about 8 mm. The value of this radius of curvature R3 is obtained by assuming that a plurality of different surfaces extending in the front-rear direction are one curved surface.

The concave portion 11C is provided at the lower end portion of the toilet bowl portion 11, as shown in FIG. The concave portion 11C is formed so as to be depressed downward. The recessed portion 11C has a side wall surface 11F that rises in an annular shape, and a bottom wall surface 11G that continues from the lower end of the side wall surface 11F and forms the bottom of the recessed portion 11C. The side wall surface 11F is slightly slanted downward and inward. The curvature radius R1 of the upper end of the front end portion of the side wall surface 11F in plan view is approximately 28 mm (see FIG. 3). A curvature radius R4 of the lower end of the front end portion of the side wall surface 11F in plan view is approximately 22 mm (see FIG. 3). The upper edge Te of the side wall surface 11F is continuous with the inner peripheral edge of the contaminant receiving surface 11B via the inner connecting surface C2 over the entire circumference (see FIG. 3). The curvature radius R2 of the front end portion of the inner connecting surface C2 in the vertical cross-sectional shape at the center in the left-right direction is approximately 12 mm. The vertical position of the upper edge Te of the side wall surface 11F gradually rises rearward from the front end Fe and abruptly lowers at the rear end. At the upper edge Te of the side wall surface 11F, the vertical position of the rear end Re is the lowest. An outflow port 11H is formed at the rear portion of the bottom wall surface 11G of the recess 11C. The bottom wall surface 11G is inclined slightly downward toward the outflow port 11H (that is, backward). The upstream end of the toilet drainage channel 11J is connected to the outflow port 11H. A reservoir R of cleaning water is formed in the concave portion 11C. A pooled water surface W of the pooled water portion R when no cleansing water is flowing into the concave portion 11C is located below the upper edge Te and above the bottom wall surface 11G, and is closer to the bottom wall surface 11G than the upper edge Te.

<Configuration of water supply unit>
The water supply part 13 is provided behind the toilet bowl part 11 . The water supply part 13 is for supplying washing water to the toilet bowl part 11 and is adjacent to the rear of the upper end part of the toilet bowl part 11 . A water supply space 13A is formed in the water supply unit 13 . The water supply space 13A and the toilet bowl portion 11 are continuously communicated through the rim spout 11E (see FIG. 3). A tank mounting portion 13B for mounting a cleaning tank (not shown) is provided at the rear portion of the water supply portion 13 .

<Configuration of washing water pipe>
The washing water pipe 12, which is the water discharge part, is arranged in the water supply space 13A. The washing water pipe 12 spouts washing water toward the toilet bowl portion 11 from the washing tank placed on the tank mounting portion 13B. As shown in FIG. 3, the washing water pipe 12 has a tubular first water discharger 12A and a tubular second water discharger 12B. The first water discharger 12A and the second water discharger 12B are bifurcated.

The first water discharger 12A is arranged on the right side of the water supply space 13A so as to extend in the front-rear direction. A front end portion of the first water discharging portion 12A is formed to be bent leftward. The tip of the bent front end of the first water discharger 12A is arranged on the left side of the water supply space 13A. A first water discharge port 12C for discharging cleansing water is formed to open at the front end of the first water discharger 12A.

The second water discharger 12B is arranged on the left side of the water supply space 13A so as to extend in the front-rear direction. A second water discharge port 12D for discharging cleansing water is formed to open at the front end of the second water discharger 12B. In plan view, the first water outlet 12C and the second water outlet 12D are open toward the front left. In plan view, the opening direction of the second water outlet 12D is more forward than that of the first water outlet 12C. In plan view, the first water outlet 12C and the second water outlet 12D are located behind the rim water outlet 11E. In plan view, the first water outlet 12C is arranged forward of the second water outlet 12D. In plan view, the first water outlet 12C and the second water outlet 12D are arranged on the left side of the water supply space 13A.

As shown in FIG. 4, the first water outlet 12C and the second water outlet 12D are arranged side by side in the left-right direction. The lower end of the first water outlet 12C and the lower end of the second water outlet 12D have different positions in the height direction. Specifically, the lower end of the first water outlet 12C is arranged at a position lower than the lower end of the second water outlet 12D.

<How flush water flows in the toilet bowl>
The washing water is stored in advance in an amount sufficient to wash the toilet bowl 11 once in a washing tank (not shown). For example, when an operation unit (not shown) provided in the cleaning tank is operated to start one toilet cleaning, water is discharged from each of the first water outlet 12C and the second water outlet 12D toward the toilet bowl 11 as shown in FIG.

The wash water spouted from the first water spout 12C and the wash water spouted from the second water spout 12D flow so as to cross each other on the dirt receiving surface 11B located in front of the rim spout 11E. Specifically, the wash water spouted from the first water spout 12C passes through the rim spout 11E, flows to the dirt receiving surface 11B, and forms a first mainstream F1 that flows counterclockwise along the rim inner wall surface 11D. That is, the first water outlet 12C spouts the first mainstream F1. The wash water spouted from the first water spout 12C includes a flow F11 that does not form the first main flow F1 and directly flows down toward the recess 11C.

The wash water spouted from the second water spout 12D forms a second mainstream F2 that passes through the rim spout 11E, passes through the dirt receiving surface 11B, and flows in a bundle toward the recess 11C. That is, the second water outlet 12D spouts the second mainstream F2. The wash water spouted from the second water spout 12D also includes a flow F21 that does not form the second main flow F2 and swirls counterclockwise along the rim inner wall surface 11D.

The lower end of the first water outlet 12C is positioned lower than the lower end of the second water outlet 12D (see FIG. 4). Therefore, the second main flow F2 discharged from the second water discharge port 12D is discharged to a position higher than the first main flow F1 discharged from the first water discharge port 12C, and flows so as to cover the first main flow F1 on the dirt receiving surface 11B positioned in front of the rim water discharge port 11E. At this time (that is, before flowing into the recess 11C), part of the second main flow F2 forms a flow F22 that joins the first main flow F1, and flows counterclockwise along the rim inner wall surface 11D.

The amount of water in the second main stream F2 joining the first main stream F1 (that is, the amount of water in the flow F22) is 50% or less of the amount of water in the second main stream F2 spouted from the second water outlet 12D. The second main flow F2 flowing above the first main flow F1 does not join the first main flow F1, flows above the first main flow F1 toward the recess 11C, and directly flows into the recess 11C. In this way, before flowing into the recessed portion 11C in the toilet bowl portion 11, the first main flow F1 and the second main flow F2 flow at different positions in the vertical direction at the portion where the first main flow F1 and the second main flow F2 intersect and overlap.

After crossing the second mainstream F2, the first mainstream F1 flows forward on the left dirt receiving surface 11B, collides with the front end part of the rim inner wall surface 11D, changes its flow direction to the rear right, and flows backward on the right dirt receiving surface 11B. A part of the first mainstream F1 flowing backward on the right dirt receiving surface 11B forms a flow F12 toward the recess 11C and flows into the recess 11C at a position behind the front end of the recess 11C. In other words, the flow F12, which is part of the first main flow F1 that flows backward on the right dirt receiving surface 11B, flows into the recess 11C from the right front.

The second main flow F2 after crossing the first main flow F1 (that is, the second main flow F2 that does not join the first main flow F1) flows forward on the left dirt receiving surface 11B and flows into the recess 11C at a position forward of the rear end of the recess 11C. In other words, the second mainstream F2 flowing forward on the left dirt receiving surface 11B flows into the recess 11C from the left rear. That is, the first mainstream F1 that turns along the rim inner wall surface 11D and flows backward on the dirt receiving surface 11B, and the second mainstream F2 that flows forward on the dirt receiving surface 11B flow into the recess 11C from a position overlapping the recess 11C in the front-rear direction. The cleansing water discharged from the cleansing water pipe 12 (water discharge portion) forms at least two flows, a first main flow F1 and a second main flow F2, and flows into the concave portion 11C.

The first mainstream F1 (that is, the first mainstream F1 excluding the flow F12) that flows backward on the right dirt receiving surface 11B and does not flow into the recess 11C reaches the rear end of the dirt receiving surface 11B. The first mainstream F1 that has reached the rear end of the dirt receiving surface 11B collides with the rear end of the rim inner wall surface 11D, and changes its direction of flow forward and leftward. The first main flow F1, which has changed its direction of flow forward and leftward, gradually approaches from the right to join the second main flow F2, which does not join the first main flow F1, and flows into the concave portion 11C.

The angle θ between the first mainstream F1 that turns along the rim inner wall surface 11D, reaches the rear end of the dirt receiving surface 11B, flows forward on the dirt receiving surface 11B, and the second mainstream F2 that flows forward on the dirt receiving surface 11B is 20 degrees or less in plan view. Thus, the first mainstream F1 and the second mainstream F2 join at 20 degrees or less and flow into the recess 11C.

As shown in FIG. 6, the flow rate of the first mainstream F1 and the flow rate of the second mainstream F2 sharply increase when water spouting is started (time T0), are maintained at a predetermined flow rate for a while, and then gradually decrease. Flow rate means the amount of fluid that passes per unit time at any given location. In one flush of the toilet bowl, the time for spouting water from the flushing water pipe 12 (spraying portion) is the time t1 between the time T0 when water spouting starts (hereinafter also simply referred to as time T0) and the time when water spouting ends T2 (hereinafter simply referred to as time T2). Time T1 is the time when the flow rate of the first mainstream F1 and the flow rate of the second mainstream F2 become the same.

Between time T0 and time T1, the flow rate of the first mainstream F1 is greater than the flow rate of the second mainstream F2. Between the time T1 and the time T2, the flow rate of the first mainstream F1 is less than the flow rate of the second mainstream F2. Time t0 from time T0 to time T1 is longer than time t2 from time T1 to time T2. That is, in one flush of the toilet bowl, the flow rate of the first mainstream F1 is higher than the flow rate of the second mainstream F2 for at least half of the time during which water is spouted from the flushing water pipe 12 (water spouting portion).

<Washing water flow in recessed portions>
The second main flow F2 that does not join the first main flow F1 is bundled from the rear left and flows into the recess 11C, and turns in the recess 11C in the vertical direction. Specifically, as shown in FIGS. 7 and 8, the second mainstream F2 that has flowed into the recess 11C from the left rear rises along the bottom wall surface 11G and the side wall surface 11F on the front side of the recess 11C. Along with this, the second mainstream F2 turns vertically to become a downward flow again behind the recess 11C, passes through the outlet 11H, and flows into the toilet drainage channel 11J.

The second mainstream F2, which rises on the front side of the recess 11C, reaches a position higher than the rear end Re of the upper edge Te of the side wall surface 11F of the recess 11C. Specifically, the second main flow F2 that has risen on the front side of the recess 11C reaches a position higher than the upper edge Te of the recess 11C in more than half of the entire circumference of the upper edge Te of the side wall surface 11F of the recess 11C (the dotted line section in FIG. 7). Furthermore, the highest position P reached by the second main flow F2 on the front side of the recess 11C is higher than the position N on the upper edge Te of the recess 11C closest to this position P (see FIGS. 7 and 8).

The second mainstream F2, which rises in front of the recess 11C, forms a bundle, descends backward, passes through the right side of the outflow port 11H, and flows into the toilet drainage channel 11J. The bundled second mainstream F2 descends and passes through the right side of the outlet 11H (see FIG. 7). Therefore, the amount of washing water per unit time passing through the outlet 11H is larger on the right side of the outlet 11H than on the left side of the outlet 11H. At this time, the second main stream F2 descending backward passes through the outlet 11H toward the downstream side so as to occupy 2/3 or more of the area of the outlet 11H (see FIG. 7).

In one toilet flush, the flush water rising in front of the recess 11C reaches a position higher than at least a part of the upper edge Te of the side wall surface 11F of the recess 11C for at least half of the time when the water is spouted from the flush water pipe 12. In this way, the second main flow F2 rising in front of the recess 11C is located on the right side of the recess 11C and flows into the recess 11C in a bundle from the left rear of the recess 11C.

According to the embodiment configured as described above, the following effects are obtained.

The toilet bowl 1 includes a toilet bowl portion 11 and a washing water pipe 12. - 特許庁The toilet bowl portion 11 includes a rim portion 11A and a recess portion 11C. The rim portion 11A is provided at the upper end portion of the toilet bowl portion 11 and has a rim inner wall surface 11D. The concave portion 11</b>C is provided at the lower end portion of the toilet bowl portion 11 . The washing water pipe 12 spouts washing water into the toilet bowl portion 11 . The wash water discharged from the wash water pipe 12 flows into the recess 11C in at least two flows: a first main flow F1 that swirls along the rim inner wall surface 11D and a second main flow F2 that flows down toward the recess 11C. Before flowing into the concave portion 11C in the toilet bowl portion 11, the positions in the vertical direction of the first mainstream F1 and the second mainstream F2 are different from each other. The flow F22, which is part of the second main flow F2 before flowing into the recess 11C, joins the first main flow F1. According to this configuration, the flow F22, which is a part of the second main flow F2, joins the first main flow F1 before flowing into the concave portion 11C in the toilet bowl portion 11, whereby the force of the first main flow F1 can be controlled so as not to generate splashes from the first main flow F1.

The second main flow F2 that does not join the first main flow F1 in the toilet bowl 1 directly flows into the recess 11C. According to this configuration, it is possible to maintain a flow that directly flows into the recess 11C, and it is possible to maintain the action of agitating the waste in the recess 11C.

The flushing water pipe 12 of the toilet bowl 1 is formed with a first water outlet 12C for discharging the first main flow F1 and a second water outlet 12D for discharging the second main flow F2. According to this configuration, by making the lower end of the first water outlet 12C and the lower end of the second water outlet 12D differ from each other in the height direction, even when the flow rate of the spouted cleansing water changes, the vertical positions of the first main stream F1 and the second main stream F2 can be stably kept different from each other.

The lower end of the first spout 12C of the toilet bowl 1 is positioned lower than the lower end of the second spout 12D. According to this configuration, the first main flow F1 can be positioned below the second main flow F2, thereby causing the second main flow F2 to flow so as to cover the first main flow F1, thereby satisfactorily suppressing the generation of droplets from the first main flow F1.

The first spout 12C and the second spout 12D of the toilet bowl 1 are arranged side by side in the left-right direction. According to this configuration, when the water source of flushing water is located behind the toilet bowl 11, by arranging the first water outlet 12C and the second water outlet 12D side by side in the left-right direction between the water source and the toilet bowl 11, it is possible to easily realize the configuration for discharging the first main flow F1 and the second main flow F2.

In the toilet bowl 1, the amount of water in the flow F22, which is part of the second main stream F2 joining the first main stream F1, is 50% or less of the water amount in the second main stream F2. According to this configuration, it is easy to maintain the direction of each flow by avoiding excessive mixing of the flows.

The toilet bowl portion 11 of the toilet bowl 1 has a filth receiving surface 11B that is continuous with the lower end of the rim inner wall surface 11D via the outer connecting surface C1. In the concave portion 11C, the upper edge Te of the side wall surface 11F is continuous with the inner peripheral edge of the contaminant receiving surface 11B via the inner connecting surface C2. A first mainstream F1 that swirls along the rim inner wall surface 11D and flows backward on the dirt receiving surface 11B, and a second mainstream F2 that flows forward on the dirt receiving surface 11B flow into the recess 11C from a position overlapping the recess 11C in the front-rear direction. According to this configuration, the left and right side walls of the recess 11C can be washed off well with the washing water.

In the toilet bowl 1, the first mainstream F1 that turns along the rim inner wall surface 11D, reaches the rear end of the dirt receiving surface 11B and flows forward on the dirt receiving surface 11B, and the second mainstream F2 that flows forward on the dirt receiving surface 11B merge at 20 degrees or less in plan view. According to this configuration, the flow of the second main flow F2 can be made less likely to be obstructed by the first main flow F1 that has reached the rear end portion of the filth receiving surface 11B.

In one flush of the toilet bowl 1, the flow rate of the first main flow F1 is higher than the flow rate of the second main flow F2 for at least half of the time during which water is spouted from the washing water pipe 12. Since the first mainstream F1 has a longer flow distance in the toilet bowl part 11 than the second mainstream F2, according to this configuration, the first mainstream F1 can be swirled along the rim inner wall surface 11D to evenly flow in the toilet bowl part 11. - 特許庁

<Other embodiments>
The present disclosure is not limited to the disclosure of Embodiment 1 explained by the above description and drawings, and includes, for example, the following embodiments.
(1) Unlike the first embodiment, two or more rim spouts may be provided. For example, a configuration is conceivable in which the first main stream is discharged from one rim water outlet and the second main stream is discharged from the other rim water outlet.
(2) The position of the rim spout is not limited to that of the first embodiment. The direction in which flush water is discharged from the rim spout and the direction in which the flush water is swirled in the toilet bowl are not limited. Therefore, the second main stream rising in front of the recess may be positioned on the left side of the recess and flow into the recess in a bundle from the rear on the right side of the recess.
(3) Different from the first embodiment, the second main flow that rises on the front side of the recess may reach a position higher than the upper edge of the recess over 3/4 or more of the entire circumference of the upper edge of the recess. Further, the second main stream that has risen on the front side of the recess may reach a position higher than the upper edge of the recess over the entire circumference of the upper edge of the recess.
(4) Unlike Embodiment 1, the flow rate of the first main flow may be greater than the flow rate of the second main flow throughout the time that water is spouted from the washing water pipe.
(5) As shown in FIG. 9, a rim spout may be formed by opening in a region H on the front side of the center in the front-rear direction of the rim inner wall surface 11D and on the right side of the center in the left-right direction. In this case, the wash water spouted from the rim spout flows backward on the dirt receiving surface 11B on the right side.

DESCRIPTION OF SYMBOLS 1... Toilet bowl, 11... Toilet bowl part, 11A... Rim part, 11B... Waste receiving surface, 11C... Recessed part, 11D... Rim inner wall surface, 12... Cleaning water pipe (water discharge part), 12C... First water outlet, 12D... Second water outlet, F1... First main stream, F2... Second main stream, F22... Flow (part of second main stream)

Claims (9)

a rim portion provided at the upper end portion and having a rim inner wall surface;
a concave portion provided at the lower end;
a toilet bowl portion comprising a
a water discharger that discharges cleansing water into the toilet bowl;
and
The wash water spouted from the water spouting part is
a first mainstream that turns along the inner wall surface of the rim;
a second main stream flowing down toward the recess;
flows into the recess in at least two streams of
Before flowing into the concave portion in the toilet bowl portion, the first main flow and the second main flow have different positions in the vertical direction,
A part of the second mainstream before flowing into the recess joins the first mainstream. The toilet bowl according to claim 1, wherein the second main stream that does not join the first main stream directly flows into the recess. The water discharge part is
a first water outlet for discharging the first main flow;
a second water outlet for discharging the second main stream;
is formed and
The toilet bowl according to any one of claims 1 and 2, wherein the lower end of the first spout and the lower end of the second spout are different in position in the height direction. The toilet bowl according to claim 3, wherein the lower end of the first spout is positioned lower than the lower end of the second spout. The toilet bowl according to any one of claims 3 and 4, wherein the first spout and the second spout are arranged side by side in the left-right direction. 6. The toilet bowl according to any one of claims 1 to 5, wherein the amount of water in said second main stream joining said first main stream is 50% or less of the amount of water in said second main stream. The toilet bowl portion has a filth receiving surface continuous with the lower end of the inner wall surface of the rim,
The concave portion has an upper edge continuous with an inner peripheral edge of the dirt receiving surface,
7. The toilet bowl according to any one of claims 1 to 6, wherein the first main stream that swirls along the inner wall surface of the rim and flows backward on the waste receiving surface and the second main stream that flows forward on the waste receiving surface flow into the recess from a position overlapping the recess in the front-rear direction. 8. The toilet bowl according to claim 7, wherein the first main flow that turns along the inner wall surface of the rim, reaches the rear end of the filth receiving surface, and flows forward on the filth receiving surface, and the second main flow that flows forward on the filth receiving surface join at an angle of 20 degrees or less in a plan view. 9. The toilet bowl according to any one of claims 1 to 8, wherein the flow rate of the first main flow is higher than the flow rate of the second main flow for at least half of the time during which water is spouted from the spouting portion in one flush.

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