Flush toilet

Abstract

To provide a flush toilet that can improve sewerage discharge performance even when a pooled water level is formed larger than before.SOLUTION: A flush toilet has: a bowl part 6 having a sewage receiving surface 14, a rim part 16, and a trap part 18; a first discharge port 20 provided in the rim part 16 on one side in a lateral direction of the bowl part 6 and discharging washing water along an inner peripheral surface 16a of the rim part 16 to form a swirling flow; and a second discharge port 22 provided in the rim part 16 on the other side in the lateral direction of the bowl part 6 and discharging the washing water in the same direction as a swirling direction of the washing water discharged from the first discharge port 20 along the inner peripheral surface 16a of the rim part 16, wherein a projection part 30 that protrudes toward the inside of the bowl part 6 is provided in an upper part of the inner peripheral surface 16a of the rim part 16 in the vicinity of an upstream side of the second discharge port 22, and the projection part 30 has a bottom surface 30d configured to change a flow direction of the washing water flowing along the inner peripheral surface 16a of the rim part 16 to a downward direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that expels waste using flush water supplied from a flush water source. [Background technology]

[0002] Conventionally, flush toilets have been known which include a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, a basin portion formed below the waste receiving surface within which a water collection surface is formed, and first and second spouts which spout flush water along the inner surface of the rim portion to form a swirling flow. In such flush toilets, as shown in Patent Document 1, for example, a protrusion that protrudes toward the inside of the bowl is provided on the lower part of the inner circumferential surface of the rim near the second spout. In such flush toilets, flush water discharged from the first spout swirls along the inner circumferential surface of the rim and hits the protrusion provided near the second spout. The flush water hits the side of the protrusion and changes its flow direction to the left. The flush water then flows down along the slope of the waste receiving surface toward the pooled water surface in the basin. This pushes waste toward the entrance of the drainage pipe and is discharged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-200605 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in order to prevent waste from adhering to the waste receiving surface in a flush toilet, it is conceivable to reduce the area of ​​the waste receiving surface, which is the dry surface, and make the water pooling surface larger than before. However, in the flush toilet of Patent Document 1 mentioned above, if the water pooling surface is made larger than before, the force pushing the waste is dispersed and weakened, resulting in the problem that the waste will remain without being expelled.

[0005] Therefore, the present invention has been made to solve the above-mentioned problems, and has as its object to provide a flush toilet that can improve waste discharge performance even if the pooled water surface is made larger than before. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a flush toilet that discharges waste using flush water supplied from a flush water source, the flush toilet having a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface and having an inner circumferential surface, and a pit portion formed below the waste receiving surface and within which a pooling surface is formed, a first water outlet provided in the rim portion on one left-right side of the bowl portion and which discharges flush water along the inner circumferential surface of the rim portion to form a swirling flow, a second water outlet provided in the rim portion on the other left-right side of the bowl portion and which discharges flush water along the inner circumferential surface of the rim portion in the same direction as the swirling direction of the flush water discharged from the first water outlet, and a drainage pipe connected to the pit portion for discharging waste, the upper part of the inner circumferential surface of the rim portion being provided with a protrusion that protrudes toward the inside of the bowl portion near the upstream side of the second water outlet, and this protrusion has a bottom surface configured to change the flow direction of the flush water flowing along the inner circumferential surface of the rim portion downward. In the present invention configured in this way, a protrusion that protrudes toward the inside of the bowl section is provided on the upper part of the inner circumferential surface of the rim section near the upstream side of the second water outlet, and this protrusion has a bottom surface configured to change the flow direction of flush water flowing along the inner circumferential surface of the rim section downward, so that the bottom surface of the protrusion can directly change the flow direction downward and strengthen the momentum of flush water flowing down toward the pooled water surface in the bowl section. As a result, the force pushing in the waste can be strengthened, and waste discharge performance can be improved even if the pooled water surface is formed larger than before.

[0007] In the present invention, the amount by which the innermost end of the protrusion protrudes inwardly into the bowl portion relative to the lower end of the inner circumferential surface of the rim portion is preferably set to increase downstream and then decrease. In the present invention configured in this manner, the amount by which the innermost end of the protrusion protrudes inwardly into the bowl portion relative to the lower end of the inner surface of the rim portion is preferably set to increase downstream and then decrease, thereby making it possible to make the protrusion less noticeable and to cause the cleaning water swirling around the inner surface of the rim portion to collide with the protrusion and flow downward.

[0008] In the present invention, the maximum projection amount of the projection is preferably set to be maximum on the inner circumferential surface of the rim portion in the rear region of the bowl portion. In the present invention configured in this manner, the maximum protrusion amount of the protrusion is set to be the greatest on the inner surface of the rim portion in the rear region of the bowl portion, so that the cleaning water swirling around the inner surface of the rim portion can be reliably caused to collide with the protrusion and flow down.

[0009] In the present invention, the inner circumferential surface of the rim portion below the projection is preferably formed so that the radius of curvature of the inner circumferential surface in a plan view is the smallest of any of the entire circumference of the bowl portion. In the present invention thus configured, the inner peripheral surface of the rim portion below the protrusion is formed so that the radius of curvature of the inner peripheral surface in a plan view is the smallest around the entire circumference of the bowl portion, which allows a relatively large pressure loss to be applied to the swirling flush water, causing the flush water to spread vertically and collide with the protrusion.

[0010] In the present invention, the upper edge of the waste receiving surface is preferably inclined upward from its front end toward the protruding portion. In the present invention configured in this manner, the upper edge of the waste receiving surface is inclined upward from its front end toward the protruding portion, so that the cleaning water swirling around the upper edge of the waste receiving surface can be guided toward the protruding portion, causing the cleaning water to collide with the protruding portion.

[0011] In the present invention, preferably, the inner surface of the rim portion above the second water outlet is provided with a sloping portion that slopes upwardly toward the inside of the bowl portion, and this sloping portion is provided downstream of the protrusion. In the present invention configured in this manner, an inclined portion is provided on the inner surface of the rim portion above the second water outlet, sloping upward toward the inside of the bowl portion, so that cleaning water that passes over the protrusion without flowing downward can be made to flow downward via the inclined portion. Effect of the Invention

[0012] According to the flush toilet of the present invention, it is possible to provide a flush toilet that can improve waste discharge performance even if the pooling surface is formed larger than before. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a side view of a flush toilet according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 3 is a partial enlarged view showing the vicinity of the second water outlet in the bowl portion of the flush toilet according to the embodiment of the present invention shown in FIG. 2. [Figure 4A] FIG. 4 is a cross-sectional view taken along line IVA-IVA in FIG. 3. [Figure 4B] FIG. 4 is a cross-sectional view taken along line IVB-IVB in FIG. [Figure 4C] FIG. 4 is a cross-sectional view taken along the line IVC-IVC in FIG. 3. [Figure 5A] FIG. 4 is a cross-sectional view taken along the line VA-VA in FIG. [Figure 5B] FIG. 4 is a cross-sectional view taken along line VB-VB in FIG. [Figure 6] FIG. 2 is a perspective view showing, in outline, the flow of flush water in the bowl portion of a flush toilet according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Below, we will explain a flush toilet 1 according to an embodiment of the present invention. First, the basic structure of the flush toilet 1 will be explained with reference to Figures 1 and 2. Figure 1 is a side view of a flush toilet according to an embodiment of the present invention, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1.

[0015] In this specification, when a user looks at flush toilet 1 from the front, the front of flush toilet 1 will be described as the "front side", the back side as the "rear side", the right side as the "right side", the left side as the "left side", the front-to-back direction of flush toilet 1 will be described as the "front-to-back direction", the left-to-right direction will be described as the "left-to-right direction", and the up-down direction will be described as the "vertical direction".

[0016] As shown in Figures 1 and 2, flush toilet 1 is a wash-down toilet in which waste is washed away by the flowing water caused by the difference in height of the water inside the bowl. Flush toilet 1 comprises a ceramic toilet body 2 and a water storage tank 4 which stores flushing water for cleaning toilet body 2. A bowl section 6 is formed in the front of toilet body 2, and a common water conduit 8 which communicates with water storage tank 4 is formed in the upper rear part of bowl section 6. Furthermore, a drainage pipe 10 is formed in the lower rear part of bowl section 6 for discharging waste. In the embodiment of the present invention, a wash-down toilet will be described, but the present invention is not limited to this, and the flush toilet of the present invention also includes a siphon type toilet that discharges waste by siphon action.

[0017] The above-mentioned water tank 4 is equipped with a drain valve 12, and when the user opens an operating lever (not shown), the drain valve 12 opens and flush water in the water tank 4 is supplied to the toilet body 2. Furthermore, in the flush toilet of the present invention, other than the water storage tank 4, the flush water source may be one that uses direct tap water pressure or a flush valve, and flush water may also be supplied using a pump.

[0018] The bowl section 6 is provided with a bowl-shaped waste receiving surface 14, a rim section 16 formed above the waste receiving surface 14 and having an inner peripheral surface 16a exposed to the outside, and a basin section 18 formed below the waste receiving surface 14 and forming a water pooling surface W therein. Here, the water pooling surface W of the basin section 18 is substantially triangular in plan view, measuring 160mm to 180mm in the front-to-back direction and 125mm to 145mm in the lateral direction, and is formed larger (enlarged) than the water pooling surface of a conventional wash-down toilet. The basin section 18 is also 200mm to 240mm in the front-to-back direction and 150mm to 190mm in the lateral direction in plan view, forming a substantially egg-shaped triangle (an elliptical shape tapered at the front) larger than the water pooling surface W.

[0019] The pot portion 18 of the bowl portion 6 includes a bottom wall 18a that forms the bottom surface, and a side wall 18b that extends substantially vertically upward from the outer edge of the bottom wall 18a. In this manner, the pot portion 18 is formed into a pot-like shape by the bottom wall 18a and the side wall 18b, and is capable of storing water inside.

[0020] A first water outlet 20 that spouts flush water is formed at the front left position on the rim portion 16 of the bowl portion 6, and a second water outlet 22 that spouts flush water is formed at the rear right position. The above-mentioned common water conduit 8 branches downstream into a first water conduit 24 and a second water conduit 26, with the first water conduit 24 extending to the first water outlet 20 and the second water conduit 26 extending to the second water outlet 22, and flush water is supplied from the water storage tank 4 to the first water outlet 20 and the second water outlet 22.

[0021] The first water outlet 20 spouts flush water toward the front of the bowl portion 6, and the second water outlet 22 spouts flush water toward the rear of the bowl portion 6. The first water outlet 20 and the second water outlet 22 are configured to form a swirling flow in the same counterclockwise direction on the waste receiving surface 14. Furthermore, in the case of the embodiment of the present invention, of the amount of flush water supplied from the water storage tank 4 to the common water conduit 8, the ratio of the amount of flush water spouted from the first water outlet 20 to the amount of flush water spouted from the second water outlet 22 is approximately 6:4, which is a greater amount of flush water spouted from the second water outlet 22 than in the past. Furthermore, the flush toilet of the present invention may have one water outlet, or it may have two or more (for example, three).

[0022] The drainage pipe 10 is provided with an inlet 10a connected to the bottom wall 18a of the pot portion 18, an introduction pipe 10b extending downward from the inlet 10a, an ascending pipe 10c extending upward from the introduction pipe 10b, a descending pipe 10d extending downward from the ascending pipe 10c, and a top portion 10e located between the descending pipe 10d and the ascending pipe 10c and defining the water level of the pooled water surface W before the start of flushing. The introduction pipe 10b is connected to the bottom wall 18a of the pot portion 18 as a smooth, continuous curved surface, allowing the flushing water flowing in from the inlet 10a to flow smoothly. Here, the lower end of the descending pipe 10d of the drain pipe 10 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0023] Next, the structure of the bowl portion 6 of a flush toilet 1 according to an embodiment of the present invention will be explained in detail with reference to Figures 2 to 4C. Figure 3 is a partially enlarged view of the vicinity of the second spout 22 in the bowl portion 6 of the flush toilet 1 according to the embodiment of the present invention shown in Figure 2, Figure 4A is a cross-sectional view taken along line IVA-IVA in Figure 3, Figure 4B is a cross-sectional view taken along line IVB-IVB in Figure 3, and Figure 4C is a cross-sectional view taken along line IVC-IVC in Figure 3. 2 and 3 indicate the innermost end 16b of the rim portion 16 (the upper opening of the bowl portion 6) when the flush toilet 1 is viewed from above. Additionally, the cross-sectional views in Figures 4A to 4C show cross sections perpendicular to the flow direction of flush water swirling around the inner circumferential surface 16a of the rim portion 16.

[0024] As shown in FIG. 1, the rim portion 16 of the bowl portion 6 is formed with a first water outlet 20 for discharging flush water at a position on the front left side, and a second water outlet 22 for discharging flush water at a position on the rear right side, as described above. Also, as shown in FIG. 2, the rim portion 16 is formed with an inner peripheral surface 16a extending upward from the upper edge portion 14a of the waste receiving surface 14 over almost the entire circumference. The inner peripheral surface 16a of the rim portion 16, together with the upper edge portion 14a of the waste receiving surface 14, constitutes a water passage through which the flush water discharged from the first water outlet 20 and the second water outlet 22 flows. The flush water discharged from the first water outlet 20 and the second water outlet 22 flows in the same direction over the upper edge portion 14a and the inner peripheral surface 16a to form a swirling flow.

[0025] As shown in Figs. 2 and 3, a protrusion 30 is formed on the inner circumferential surface 16a of the rim portion 16 near the upstream side of the second water outlet 22 (immediately upstream of the second water outlet 22) that protrudes toward the inside of the bowl portion 6 (area 30 surrounded by dotted lines in Figs. 2 and 3). The protrusion 30 is located on the right rear side of the pot portion 18 in a plan view of the bowl portion 16, and is located on the most downstream side of the inner circumferential surface 16a of the rim portion 16 from the first water outlet 20 to the second water outlet 22. With this configuration, flush water discharged from the first water outlet 20 swirls around the inner circumferential surface 16a of the rim portion 16, collides with the protrusion 30, and flows down toward the pot portion 18. The amount of flush water that collides with the protrusion 30 and flows down is about 30 percent of the total amount of water discharged from the first water outlet 20.

[0026] As shown in Figures 4A to 4C, the protrusion 30 is formed on the upper portion of the inner circumferential surface 16a (above the center line that vertically bisects the inner circumferential surface 16a). No protrusion 30 is formed on the lower portion of the inner circumferential surface 16a (below the center line that vertically bisects the inner circumferential surface 16a), and the lower portion of the inner circumferential surface 16a extends in a substantially vertical direction. The protrusion 30 is connected to the inner circumferential surface 16a, which extends in a substantially vertical direction, as a smooth, continuously curved surface.

[0027] As shown in FIG. 3 and FIG. 4A to FIG. 4C, the protrusion 30 is formed to protrude toward the inside (center) of the bowl portion 16 as it goes upward. The protrusion amount D of the innermost end 30a (innermost end 16b of the rim portion 16) of the protrusion 30 protrudes toward the inside of the bowl portion 16 relative to the lower end 16c of the inner peripheral surface 16a of the rim portion 16 is set to gradually increase toward the downstream side in the swirling direction of the flushing water, and after reaching the maximum protrusion amount Dmax, to gradually decrease toward the downstream side (see FIG. 3). In other words, the protrusion amount D is set to be small at the upstream end 30b and the downstream end 30c, and to be the maximum protrusion amount Dmax at the midpoint between the upstream end 30b and the downstream end 30c. The maximum protrusion amount Dmax of the protrusion 30 is set to be the maximum in the inner peripheral surface 16a of the rim portion 16 in the rear region of the bowl portion 6 (rear of the center line that divides the bowl portion 6 in half in the front-rear direction).

[0028] As shown in Figs. 4A to 4C, the protruding portion 30 has a bottom surface 30d facing downward. The bottom surface 30d is formed so as to incline upward toward the inside of the bowl portion 6. The bottom surface 30d is also formed so as to be curved in an arc shape. The bottom surface 30d is formed from the upstream end 30b to the downstream end 30c in the swirling direction of the wash water. The bottom surface 30d is set so that its entire surface is oriented toward the pooled water surface W in the pot portion 18. When the wash water collides with such a bottom surface 30d, the flow direction of the wash water is changed from the swirling direction to a downward direction. In the case of the flush toilet of this embodiment, the bottom surface 30d is formed so that it slopes upward toward the inside of the bowl portion, but it may also be formed so that it extends almost horizontally. Also, in the case of the flush toilet of this embodiment, the bottom surface 30d is formed so that it is curved in an arc, but it may also be formed so that it extends in a straight line.

[0029] 2, the inner peripheral surface 16a of the rim portion 16 below the protruding portion 30 is formed such that the radius of curvature R of the inner peripheral surface 16a of the rim portion 16 is the smallest in the entire circumference of the bowl portion 6 in a plan view. When flush water flows along the inner peripheral surface 16a below the protruding portion 30, the flush water is subjected to a relatively large pressure loss. As a result, the flush water spreads out in the vertical direction and collides with the bottom surface 30d of the protruding portion 30.

[0030] 1, the upper edge 14a of the waste receiving surface 14 is gradually inclined upward from its front end 14b toward the rear protruding portion 30. The flush water flows over such upper edge 14a, so that the flush water is guided toward the protruding portion 30. The flush water guided by the upper edge 14a collides with the bottom surface 30d of the protruding portion 30.

[0031] Next, the structure around the second outlet 22 of a flush toilet 1 according to an embodiment of the present invention will be described in detail with reference to Figures 2, 3, 5A, and 5B. Figure 5A is a cross-sectional view taken along line VA-VA in Figure 3, and Figure 5B is a cross-sectional view taken along line VB-VB in Figure 3.

[0032] As shown in Figures 5A and 5B, an inclined portion 40 is formed on the inner peripheral surface 16a of the rim portion 16 above the second water outlet 22, sloping upward toward the inside of the bowl portion 6, and this inclined portion 40 is formed on the downstream side of the protruding portion 30 (the area 40 surrounded by dotted lines in Figures 2 and 3). The upstream end of the inclined portion 40 is continuously connected to the downstream end 30c of the protruding portion 30. Specifically, the inclined surface 40a of the inclined portion 40 and the bottom surface 30d of the protruding portion 30 are smoothly continuous with no steps (see Figure 6).

[0033] The distance d from the bottom end 40b of the inclined portion 40 to the innermost end 40c (the innermost end 16b of the rim portion 16) is set to be maximum on the upstream side and to gradually decrease toward the downstream side in the swirling direction of the wash water (see FIG. 3). With this configuration, the wash water that passes over the protruding portion 30 without flowing downstream is made to flow downstream by the inclined portion 40.

[0034] Next, the flow of flush water within the bowl portion 6 during toilet flushing in a flush toilet 1 according to an embodiment of the present invention will be explained with reference to Figure 6. Figure 6 is a perspective view showing, in outline, the flow of flush water in the bowl portion of a flush toilet according to an embodiment of the present invention.

[0035] When flushing begins, flush water F1 is discharged from the first water outlet 20 toward the front of the bowl portion 6, and flush water is discharged from the second water outlet 22 toward the rear of the bowl portion 6. Of the flush water discharged from the second water outlet, some of the flush water F2 swirls around the inner circumferential surface 16a of the rim portion 16, and most of the flush water F3 flows down the waste receiving surface 14 and flows directly into the pool surface W in the basin portion 18. The flush water F1 discharged from the first water outlet 20 and the flush water F2 discharged from the second water outlet 22 swirl in the same direction over the inner circumferential surface 16a of the rim portion 16 and the upper edge portion 14a of the waste receiving surface.

[0036] Flush water F1 discharged from the first water outlet 20 flows over the upper edge 14a which slopes upward from the front end 14b towards the rear protruding part 30, and is guided towards the protruding part 30. Also, as the flush water F1 flows over the inner circumferential surface 16a of the rim part 16 below the protruding part 30, it experiences a relatively large pressure loss due to the inner circumferential surface 16a having the smallest radius of curvature, and some of the flush water flows in a manner that spreads out vertically (F4). Also, the remaining flush water F5 continues to swirl and merges with flush water F2 discharged from the second water outlet 22.

[0037] The flush water F4, which has spread out in the vertical direction, collides with the bottom surface 30d of the protruding portion 30, and the flow direction changes directly from the swirling direction to downward (F6). The flush water F6 flows down toward the pooled water surface W in the basin portion 18. In this way, the flow direction changes directly from the swirling direction to downward by the bottom surface 30d of the protruding portion 30, so that the force of the flush water flowing down toward the pooled water surface W in the basin portion 18 can be strengthened. The flush water F6 also merges with the flush water F3, which flows directly into the pooled water surface W in the basin portion 18 from the second water outlet 22, and flows into the pooled water surface W in the basin portion 18 as a bundle. As a result, the force pushing in the dirt can be strengthened.

[0038] Furthermore, flush water F7 that passes over protruding portion 30 without flowing downward is caused to flow downward by inclined surface 40a of inclined portion 40 formed above second water outlet 22.

[0039] Next, the effects of the flush toilet 1 according to the embodiment of the present invention described above will be explained. First, according to the flush toilet 1 according to the embodiment of the present invention, a protrusion 30 that protrudes toward the inside of the bowl section 6 is provided on the upper part of the inner circumferential surface 16a of the rim section 16 near the upstream side of the second water outlet 22, and this protrusion 30 has a bottom surface 30d that is configured to change the flow direction of flush water flowing along the inner circumferential surface 16a of the rim section 16 downward, so that the bottom surface 30d of the protrusion 30 can directly change the flow direction downward, and the momentum of the flush water flowing down toward the pooled water surface W in the basin section 18 can be strengthened. As a result, the force pushing in waste can be strengthened, and waste discharge performance can be improved even if the pooled water surface W is formed larger than before.

[0040] In the flush toilet 1 according to an embodiment of the present invention, the amount of protrusion D by which the innermost end 30a of the protrusion 30 protrudes into the inside of the bowl portion 6 relative to the lower end 16c of the inner surface 16a of the rim portion 16 increases downstream and then decreases, making it possible to make the protrusion 30 less noticeable and allowing the flush water swirling around the inner surface 16a of the rim portion 16 to collide with the protrusion 30 and flow downward.

[0041] Furthermore, according to the flush toilet 1 according to an embodiment of the present invention, the maximum protrusion amount Dmax of the protrusion 30 is set to be the greatest on the inner surface 16a of the rim portion 16 in the rear region of the bowl portion 6, so that the flush water swirling around the inner surface 16a of the rim portion 16 can be reliably caused to collide with the protrusion 30 and flow downward.

[0042] According to the flush toilet 1 according to the embodiment of the present invention, the inner circumferential surface 16a of the rim section 16 below the protruding portion 30 is formed so that the radius of curvature R of the inner circumferential surface 16a in a plan view is the smallest over the entire circumference of the bowl section 6, and so a relatively large pressure loss can be caused to the swirling flush water. As a result, the flush water spreads out vertically, allowing it to collide with the protruding portion 30.

[0043] Furthermore, according to the flush toilet 1 of the embodiment of the present invention, the upper edge 14a of the waste receiving surface 14 is inclined upward from its front end 14b towards the protruding portion 30, so that the flush water swirling around the upper edge 14a of the waste receiving surface 14 can be guided towards the protruding portion 30, causing the flush water to collide with the protruding portion 30.

[0044] In a flush toilet 1 according to an embodiment of the present invention, an inclined portion 40 is provided on the inner surface 16a of the rim portion 16 above the second spout 22, which slopes upward toward the inside of the bowl portion 6, and this inclined portion 40 is provided downstream of the protruding portion 30, so that flush water that passes over the protruding portion 30 without flowing downward can be caused to flow downward by the inclined portion 40.

[0045] The present invention is not limited to the above-described embodiment, and various changes and modifications are possible within the scope of the technical idea described in the claims. [Explanation of symbols]

[0046] 1: Flush toilet 6: Bowl section 10: Drainage pipe 10a: Drain pipe inlet 14: Waste receiving surface 14a: Upper edge of waste receiving surface 14b: Front end of waste receiving surface 16: Rim section 16a: Inner surface of rim 16b: Innermost end of rim 16c: Lower end of inner periphery of rim 18: Pressure point section 20: First outlet 22: Second outlet 30:Protrusion 30a: innermost end of protrusion 30b: upstream end of protrusion 30c: downstream end of protrusion 30d: Bottom surface of protrusion 40: Inclined part 40a: Inclined surface of inclined portion 40b: Lower end of the inclined portion 40c: Innermost end of the inclined section D: Protrusion amount of the protrusion Dmax: Maximum protrusion amount of the protrusion R: radius of curvature W: Reservoir surface

Claims

1. A flush toilet that discharges waste using flush water supplied from a flush water source, a bowl portion including a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface and having an inner peripheral surface, and a pot portion formed below the waste receiving surface and having a water collecting surface formed therein; A first water outlet provided in the rim portion on one side of the bowl portion in the left-right direction, the first water outlet outlet being configured to discharge flush water along an inner peripheral surface of the rim portion to form a swirling flow; A second water outlet provided on the rim portion on the other side of the bowl portion in the left-right direction and which discharges flush water in the same direction as the swirling direction of flush water discharged from the first water outlet along the inner circumferential surface of the rim portion; A drainage pipe connected to the pot portion for discharging waste; having A protrusion protruding toward the inside of the bowl portion is provided on an upper portion of an inner circumferential surface of the rim portion near the upstream side of the second water outlet, A flush toilet characterized in that this protrusion has a bottom surface configured to change the flow direction of flush water flowing along the inner circumferential surface of the rim portion downward.

2. 2. The flush toilet according to claim 1, wherein the amount by which the innermost end of the protrusion protrudes inwardly into the bowl portion relative to the lower end of the inner circumferential surface of the rim portion increases toward the downstream side and then decreases.

3. 3. The flush toilet according to claim 2, wherein the maximum amount of protrusion of the protrusion is set to be the greatest on the inner circumferential surface of the rim portion in the rear region of the bowl portion.

4. The flush toilet according to any one of claims 1 to 3, wherein the inner circumferential surface of the rim portion below the protrusion is formed so that the radius of curvature of the inner circumferential surface in a plan view is the smallest over the entire circumference of the bowl portion.

5. 5. The flush toilet according to claim 4, wherein an upper edge of the waste receiving surface slopes upward from its front end towards the protruding portion.

6. 2. The flush toilet according to claim 1, wherein an inclined portion is provided on the inner circumferential surface of the rim portion above the second spout, the inclined portion sloping upward toward the inside of the bowl portion, and this inclined portion is provided downstream of the protruding portion.

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