Water closet

Abstract

To provide a water closet capable of improving dirt draining performance even when a reserved water surface is formed larger.SOLUTION: A water closet 1 for draining dirt with washing water supplied from a washing water source, includes a bowl section 6 including a bowl-shaped dirt receiving surface 14, a rim part 16 formed above the dirt receiving surface 14, and a pot part 18 formed below the dirt receiving surface 14 and having a reserved water surfacer W formed therein, water discharge ports 20, 22 provided in the rim part 16 for discharging washing water to the bowl section 6, and a drainage line 10 connected to a bottom wall 18a of the pot part 18 for draining dirt. In the bottom wall 18a of the pot part 18, a recessed part 28 is formed extending to an inlet 10a of the drainage line 10. The recessed part 28 has a restriction part 36 of which the breadth is smaller in proportion as extending to the inlet 10a of the drainage line 10.SELECTED DRAWING: Figure 3

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, as described in Patent Document 1, for example, 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 and within which a water pool is formed, and a drainage pipe connected to the bottom wall of the basin portion for discharging waste. In addition, in this type of flush toilet, the bottom wall of the basin is formed with a flat surface and a recess formed to be recessed downwards. This recess is formed so that its width increases as it approaches the entrance of the drainage pipe. With this configuration, the cleaning water that flows into the basin forms a vertical swirl within the basin by colliding with the flat portion of the bottom wall of the basin, and is collected in a recess formed in the bottom wall of the basin and flows toward the entrance of the drainage pipeline. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-50883 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a flush toilet, it is conceivable to reduce the area of ​​the waste receiving surface, which is the drying surface, and to suppress the adhesion of waste, by making the water collecting surface larger than in the past. However, in the flush toilet of Patent Document 1 mentioned above, when the pooled water surface is made larger than before, the force of the flush water that is collected in the recess and flows toward the entrance of the drainage pipe weakens, resulting in the problem that waste, especially floating waste, remains in the basin instead of being discharged, making it impossible to fully discharge the waste.

[0005] 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 when a large water pool surface is formed. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides a flush toilet that discharges waste using flushing water supplied from a flushing water source, the bowl portion having a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a pit portion formed below the waste receiving surface and within which a water storage surface is formed, a water outlet provided in the rim portion for discharging flushing water toward the bowl portion, and a drainage pipe connected to the bottom wall of the pit portion for discharging waste, the bottom wall of the pit portion having a recess formed toward the entrance of the drainage pipe, and the recess having a narrowing portion whose width becomes smaller toward the entrance of the drainage pipe. In the present invention configured in this manner, a recess is formed in the bottom wall of the pot portion extending toward the entrance of the drainage pipeline, and this recess is equipped with a constriction section whose width becomes smaller as it approaches the entrance of the drainage pipeline.Therefore, the flow rate of the cleaning water flowing into the recess increases as it passes through the constriction section, and it flows forcefully toward the entrance of the drainage pipeline, thereby improving the waste discharge performance even if the water pool surface is formed large.

[0007] Also in the present invention, the recess preferably has an enlarged portion behind the narrowed portion, the width of which increases toward the inlet of the drainage pipeline. In the present invention configured in this manner, the recess has an enlarged portion behind the narrowing portion whose width increases toward the entrance of the drain pipe, allowing flush water to flow from the recess toward a wide area of ​​the entrance of the drain pipe. This allows flush water to flow evenly and forcefully over the entire entrance of the drain pipe, improving waste discharge performance.

[0008] In the present invention, the rear end of the recess is preferably formed so that its width is approximately the same as the width of the inlet of the drainage pipeline. In the present invention configured in this manner, the rear end of the recess is formed so that its width is approximately the same as the width of the inlet of the drainage pipeline, thereby enabling a smooth connection between the recess and the drainage pipeline and suppressing pressure loss when the cleaning water flows into the drainage pipeline.

[0009] In addition, in the present invention, the constriction portion, when viewed from above, becomes smaller with a first radius of curvature toward the inlet of the drainage pipeline, and the expansion portion becomes larger with a second radius of curvature toward the inlet of the drainage pipeline, and further, the first radius of curvature is formed to be smaller than the second radius of curvature. In the present invention configured in this manner, when viewed from above, the constriction portion becomes smaller with a first radius of curvature as it approaches the entrance of the drainage pipeline, and the expansion portion becomes larger with a second radius of curvature as it approaches the entrance of the drainage pipeline, and further, the first radius of curvature is formed to be smaller than the second radius of curvature.Since the constriction portion is formed with a relatively small first radius of curvature, the flow rate of the cleaning water flowing into the constriction portion can be quickly increased, and since the expansion portion is formed with a relatively large second radius of curvature, the cleaning water can be flowed toward a wide area of ​​the entrance of the drainage pipeline.

[0010] In the present invention, the narrowed portion is preferably located in a region forward of the center of the acupressure portion in the front-rear direction. In the present invention configured in this manner, the throttle portion is located in a region forward of the center of the pot portion in the front-to-rear direction, so that it is possible to prevent waste from clogging the drain pipe near its inlet.

[0011] In the present invention, the bottom wall of the pot preferably has a front flat portion, which is a substantially flat surface, on the front side of the recess. In the present invention configured in this manner, the bottom wall of the pot portion has a front flat portion which is an almost flat surface in front of the recess, so that the front flat portion can form a vertically swirling flow within the pot portion, and the recess can form a pushing flow toward the inlet of the drainage pipeline, thereby improving the discharge performance of sewage.

[0012] In the present invention, the ratio between the front-to-rear length of the front flat portion and the front-to-rear length of the recess is preferably set to 2:8. In the present invention configured in this manner, the ratio of the front-to-rear length of the front flat portion to the front-to-rear length of the recess is set to 2:8, thereby enabling a well-balanced formation of the vertical swirling flow within the pot portion and the pushing flow toward the entrance of the drainage pipeline, thereby improving the waste discharge performance.

[0013] Also, in the present invention, preferably, the bottom wall of the pot portion has lateral flat portions, which are substantially flat surfaces, formed on both the left and right sides of the recess, and the total length of the horizontal widths of these lateral flat portions is formed so as to be smaller than the horizontal width of the recess forward of the center of the pot portion in the fore-aft direction, and is formed so as to be larger than the horizontal width of the recess rearward of the center of the pot portion in the fore-aft direction. In the present invention configured in this manner, the bottom wall of the jar portion has lateral flat portions which are approximately flat surfaces formed on both the left and right sides of the recess, and the total width of the lateral flat portions is formed so as to be smaller than the width of the recess at the front side of the jar portion and larger than the width of the recess at the rear side of the jar portion.As a result, a vertically swirling flow can be formed throughout the jar portion, thereby improving the discharge performance of waste. Effect of the Invention

[0014] According to the flush toilet of the present invention, it is possible to provide a flush toilet that can improve waste discharge performance even when a large water pooling surface is formed. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a side cross-sectional view of a flush toilet according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a plan view of a flush toilet according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a partial enlarged view of the flush toilet according to the embodiment of the present invention shown in FIG. 2. [Figure 4A] 2 is a diagram showing cross section A of the basin part of the flush toilet according to the embodiment of the invention shown in FIG. [Figure 4B] 2 is a diagram showing cross section B of the basin part of the flush toilet according to the embodiment of the invention shown in FIG. [Figure 4C] 3 is a diagram showing cross section C of the basin part of the flush toilet according to the embodiment of the invention shown in FIG. [Figure 4D] 2 is a diagram showing cross section D of the basin part of the flush toilet according to the embodiment of the invention shown in FIG. [Figure 4E] 2 is a diagram showing a cross section E of the basin part of the flush toilet according to the embodiment of the invention shown in FIG. [Diagram 5] 1 is a diagram showing a schematic diagram of the flow of flush water within a bowl portion during toilet flushing in a flush toilet according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Below, a flush toilet 1 according to an embodiment of the present invention will be explained. First, the basic structure of the flush toilet 1 will be explained with reference to Figures 1 and 2. Figure 1 is a side cross-sectional view of a flush toilet according to an embodiment of the present invention, and Figure 2 is a plan view of a flush toilet according to an embodiment of the present invention.

[0017] As shown in Figures 1 and 2, the 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. The flush toilet 1 comprises a ceramic toilet body 2 and a water storage tank 4 which stores flushing water for cleaning the toilet body 2. The toilet body 2 comprises a bowl portion 6 on the front side, and a common water conduit 8 which communicates with the water storage tank 4 is formed in the upper rear part of the bowl portion 6. Furthermore, a drainage pipe 10 is formed in the lower rear part of the bowl portion 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.

[0018] 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-front 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".

[0019] 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 source of flush water may be one that uses direct tap water pressure or a flush valve, and flush water may also be supplied using a pump.

[0020] 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, measuring 160mm to 180mm in the front-to-back direction and 125mm to 145mm in the left-to-right direction when viewed from above, 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 left-to-right direction when viewed from above, forming a substantially egg-shaped triangle (an elliptical shape tapered at the front) larger than the water pooling surface W.

[0021] 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. The above-mentioned common water conduit 8 branches downstream into a first water outlet 24 and a second water outlet 26, the first water outlet 24 extends to the first water outlet 20, and the second water outlet 26 extends to the second water outlet 22, so that flush water is supplied from the water storage tank 4 to the first water outlet 20 and the second water outlet 22. Here, the first water outlet 20 discharges water toward the front of the bowl portion 6, and the first water outlet 20 and the second water outlet 22 discharge flush water in a direction that forms a swirling flow that swirls in the same direction. In the case of the embodiment of the present invention, a counterclockwise swirling flow is formed. In addition, in an embodiment of the present invention, the ratio of the amount of flush water discharged from the first outlet 20 to the amount of flush water discharged from the second outlet 22 out of the total amount of flush water supplied from the water storage tank 4 to the common water conduit 8 is approximately 6:4, which is a greater amount of flush water discharged from the second 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 pooled water level. The introduction pipe 10b is connected to the bottom wall 18a of the pot portion 18 as a smooth, continuous curved surface, allowing the flush 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 basin part 18 of a flush toilet 1 according to an embodiment of the present invention will be described in detail with reference to Figures 1 to 4E. Figure 3 is a partially enlarged view of the basin part of the flush toilet according to the embodiment of the present invention shown in Figure 2, and Figures 4A to 4E are views showing cross sections A to E of the basin part of the flush toilet according to the embodiment of the present invention shown in Figure 1.

[0024] 1 and 3, the pot portion 18 of the bowl portion 6 has a bottom wall 18a and side walls 18b that extend upward from the bottom wall 18a and surround the water surface W on all four sides. The bottom wall 18a of the pot portion 18 has a recess 28 formed so as to be recessed downward, a front flat portion 30 that is a substantially flat surface formed in front of the recess 28, side flat portions 32 that are substantially flat surfaces formed on both the left and right sides of the recess 28, and a protrusion 34 that is formed below the rear side of the pot portion 18 and protrudes forward.

[0025] As shown in FIG. 3, the recess 28 extends in the front-rear direction on the central axis Y of the left-right center of the pot portion 18 toward the inlet 10a of the drainage pipe 10. The central axis of the left-right center of the recess 28 is coaxial with the central axis of the left-right center of the inlet 10a of the drainage pipe 10. The bottom surface 28a of the recess 28 is inclined rearward and downward toward the inlet 10a of the drainage pipe 10, and the rear end 28b of the recess 28 is located below the protruding portion 34 (see FIG. 1). The upper end 28c of the recess 28 is inclined rearward and downward toward the inlet 10a of the drainage pipe 10 at a gentler inclination angle than the bottom surface 28a (see FIG. 1). The depth (vertical width) of the recess 28 gradually deepens toward the inlet 10a of the drainage pipe 10. The rear end 28b of the recess 28 smoothly continues to the inlet 10a of the drainage pipe 10. In the initial state before the start of cleaning, the recess 28 is located below the pooled water surface W and is entirely submerged (see FIG. 1).

[0026] 3, the recess 28 has an inverted fan-shaped narrowed portion 36 whose width gradually decreases toward the inlet 10a of the drainage pipe 10 in a top view. Specifically, the narrowed portion 36 has a width gradually decreasing with a first radius of curvature R1 toward the inlet 10a of the drainage pipe 10 in a top view. The first radius of curvature R1 is formed to be smaller than a second radius of curvature R2 described later.

[0027] The throttle portion 36 is formed symmetrically about the central axis Y at the left-right center of the pot portion 18. The throttle portion 36 is formed between the front end of the pot portion 18 and the central axis X at the front-rear center of the pot portion 18, and is located forward of the central axis X at the front-rear center of the pot portion 18. The throttle portion 36 also extends in the front-rear direction on the central axis Y at the left-right center of the pot portion 18. The throttle portion 36 is inclined rearward and downward toward the inlet 10a of the drainage pipe 10, and the depth of the throttle portion 36 gradually increases toward the inlet 10a of the drainage pipe 10 (see FIG. 1).

[0028] The recess 28 also has a sector-shaped expanded portion 38 whose width gradually increases toward the inlet 10a of the drainage pipeline 10 in a top view. The expanded portion 38 is disposed behind the constricted portion 36. The expanded portion 38 has a width that gradually increases with a second radius of curvature R2 toward the inlet 10a of the drainage pipeline 10 in a top view. The second radius of curvature R2 is formed to be larger than the first radius of curvature R1.

[0029] The enlarged portion 38 is formed symmetrically with respect to the central axis Y of the left-right center of the pot portion 18. The enlarged portion 38 is formed between the rear end of the narrowed portion 36 and the central axis X of the front-rear center of the pot portion 18, and is located near the central axis X of the front-rear center of the pot portion 18. The enlarged portion 38 extends in the front-rear direction on the central axis Y of the left-right center of the pot portion 18. The front end of the enlarged portion 38 smoothly continues with the rear end of the narrowed portion 36. The rear end of the enlarged portion 38 is formed to have the largest width among the recesses 28, and is approximately the same as the width of the inlet 10a of the drainage pipe 10, and smoothly continues with the inlet 10a of the drainage pipe 10. The enlarged portion 38 is inclined downward toward the rear side toward the inlet 10a of the drainage pipe 10, and the depth of the enlarged portion 38 gradually increases toward the inlet 10a of the drainage pipe 10 (see FIG. 1).

[0030] As shown in Fig. 3, the recess 28 is formed such that the narrowed portion 36 and the expanded portion 38 are smoothly connected and the width of the recess 28 becomes smaller and then becomes larger as viewed from above toward the inlet of the drainage pipe. The recess 28 is formed such that the width of the front end of the recess 28 (the width of the front end of the narrowed portion 36) is substantially the same as the width of the rear end of the recess 28 (the width of the rear end of the expanded portion 38). The recess 28 is also formed such that its minimum width (the width of the rear end of the narrowed portion 36 or the width of the front end of the expanded portion 38) is smaller than the width of the rear end of the recess.

[0031] As shown in Figures 3 and 4A, the front flat portion 30 is formed near the front end of the pot portion 18. Specifically, the front flat portion 30 is formed in an area S1 surrounded by the left and right side walls 18b of the pot portion 18 and the front end of the recess 28 in a top view. The front flat portion 30 is disposed so as to be substantially horizontal (see Figures 1 and 4A). The ratio of the front-rear direction length of the front flat portion 30 to the front-rear direction length of the recess 28 is set to 2:8 (see Figure 1). Here, the ratio between the front-rear direction length of the front flat portion 30 and the front-rear direction length of the recessed portion 28 is preferably set in the range of 1:9 to 3:7, and most preferably set to 2:8.

[0032] As shown in FIG. 3 and FIG. 4B to FIG. 4E, the side flat portion 32 is formed near the side wall 18b of the pot portion 18 symmetrically with respect to the central axis Y of the pot portion 18 in the left-right direction. Specifically, the side flat portion 32 is formed in the region S2 and the region S3 between the side wall 18b of the pot portion 18 and the left end and the right end of the recessed portion 28, respectively, when viewed from above. The side flat portion 32 is disposed so as to be substantially horizontal (see FIG. 4B to FIG. 4E). As shown in FIG. 3, the total length of the widths of the side flat portions 32 on both the left and right sides is smaller than the width of the recessed portion 28 on the front-rear center axis X of the pot portion 18. Also, the total length of the widths of the side flat portions 32 on both the left and right sides is substantially the same as the width of the recessed portion 28 on the central axis X of the pot portion 18 in the front-rear direction. Furthermore, the total length of the widths of the left and right side flat portions 32 is greater than the width of the recess 28 behind the central axis X at the center of the pot 18 in the front-rear direction.

[0033] As described above, the pooled water surface of the flush toilet 1 of the embodiment of the present invention is larger than that of a conventional wash-down toilet, but the depth from the pooled water surface W to the bottom wall 18a of the basin portion 18 is made shallower overall than before, and the inner diameter of the drainage pipe 10 is made slightly smaller than before, so the amount of pooled water is less than before. In other words, the flush toilet 1 of the embodiment of the present invention has a pooled water surface that is larger than before, but the amount of pooled water is less than before, making it possible to achieve water conservation.

[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 5. Figure 5 is a diagram showing generally the flow of flush water within the bowl portion during toilet flushing in a flush toilet according to an embodiment of the present invention.

[0035] 5, first, part of the flush water discharged from the first water outlet 20 swirls around the inner circumferential surface 16a of the rim portion 16, while the majority flows down to the waste receiving surface 14 to form a front main flow F1. After flowing through the front region of the waste receiving surface 14 of the bowl portion 6, the front main flow F1 reaches the rear region of the waste receiving surface 14 and flows into the basin portion 18 from the rear. Meanwhile, part of the flush water discharged from the second water outlet 22 swirls around the inner circumferential surface 16a of the rim portion 16, while the majority flows down to the waste receiving surface 14 to form a rear main flow F2. After flowing through the rear region of the waste receiving surface 14 of the bowl portion 6, the rear main flow F2 reaches the front region of the waste receiving surface 14 and flows into the basin portion 18 from the front. As a result, the front main flow F1 and the rear main flow F2 of the cleaning water flow into the entire pooled water surface W in a balanced manner, so that the pooled water surface W is not disturbed and a pressing force can be applied to the entire pooled water surface W.

[0036] Next, part of the cleaning water that flows into the pot portion 18 collides with the front flat portion 30, the side flat portion 32, or the protrusion portion 34 in the pot portion 18, and is changed into an upward flow, forming a vertically swirling flow f1. This allows the floating waste to be agitated vertically together with the pooled water within the basin 18. Meanwhile, part of the flush water that has flowed into the pot portion 18 is collected in a recess 28 formed in the bottom wall 18a of the pot portion 18, forming a push flow f2 that flows along the recess 28 toward the inlet 10a of the drainage pipe 10. Because the recess 28 is provided with a throttle portion 36, the flow speed of the push flow f2 increases as it passes through the throttle portion 36, and then, as it passes through the enlarged portion 38, it flows vigorously toward the wide area of ​​the inlet 10a of the drainage pipe 10. This causes floating waste to be forcefully pushed into the drainage pipe 10.

[0037] The effects of the above-described embodiment will be described below. In a flush toilet 1 according to an embodiment of the present invention, a recess 28 extending toward the inlet 10a of the drainage pipeline 10 is formed in the bottom wall 18a of the basin portion 18, and this recess 28 is provided with a constriction section 36 whose width becomes smaller toward the inlet 10a of the drainage pipeline 10. Therefore, the flow rate of the flush water flowing into the recess 28 increases as it passes through the constriction section 36, and it flows vigorously toward the inlet 10a of the drainage pipeline 10, thereby improving the waste discharge performance even if the pooled water surface W is formed large.

[0038] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the recess 28 is provided with an enlarged section 38 behind the narrowing section 36 whose width increases towards the inlet 10a of the drainage pipeline 10, allowing flush water to flow from the recess 28 towards a wide area of ​​the inlet 10a of the drainage pipeline 10. This allows flush water to flow evenly and forcefully over the entire inlet 10a of the drainage pipeline 10, improving waste discharge performance.

[0039] In a flush toilet 1 according to an embodiment of the present invention, the rear end 28b of the recess 28 is formed so that its width is approximately the same as the width of the inlet 10a of the drainage pipeline 10, thereby allowing a smooth connection between the recess 28 and the drainage pipeline 10 and reducing pressure loss when flush water flows into the drainage pipeline 10.

[0040] Furthermore, in a flush toilet 1 according to an embodiment of the present invention, when viewed from above, the constriction section 36 becomes smaller with a first radius of curvature R1 as it approaches the inlet 10a of the drainage pipeline 10, and the expansion section 38 becomes larger with a second radius of curvature R2 as it approaches the inlet 10a of the drainage pipeline 10, and further, is formed so that the first radius of curvature R1 is smaller than the second radius of curvature R2, so that the constriction section 36 is formed with a relatively small first radius of curvature R1, thereby quickly increasing the flow rate of flush water flowing into the constriction section 36, and because the expansion section 38 is formed with a relatively large second radius of curvature R2, flush water can be made to flow toward a wide area of ​​the inlet 10a of the drainage pipeline 10.

[0041] In the flush toilet 1 according to the embodiment of the present invention, the throttle section 36 is located forward of the center in the front-to-rear direction of the basin section 18, so clogging of the drain pipe 10 near the inlet 10a with waste can be prevented.

[0042] Furthermore, in the flush toilet 1 according to an embodiment of the present invention, the bottom wall 18a of the basin portion 18 is provided with a front flat portion 30, which is a substantially flat surface, on the front side of the recess 28, and the front flat portion 30 makes it possible to form a vertically swirling flow within the basin portion 18, while the recess 28 makes it possible to form a pushing flow toward the inlet 10a of the drainage pipeline 10, thereby improving waste discharge performance.

[0043] In a flush toilet 1 according to an embodiment of the present invention, the ratio of the front-to-rear length of the front flat portion 30 to the front-to-rear length of the recess 28 is set to 2:8, thereby enabling the formation of a well-balanced vertical swirling flow in the basin portion 18 and a pushing flow toward the inlet 10a of the drainage pipe 10, thereby improving waste discharge performance.

[0044] Furthermore, in the flush toilet 1 according to an embodiment of the present invention, the bottom wall 18a of the basin portion 18 has lateral flat portions 32, which are nearly flat surfaces, formed on both the left and right sides of the recess 28, and the total width of the lateral flat portions 32 is formed so that it is smaller than the width of the recess 28 at the front side of the basin portion 18, and is formed so that it is larger than the width of the recess 28 at the rear side of the basin portion 18, so that a vertical swirling flow can be more effectively formed throughout the basin portion 18, improving waste discharge performance.

[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 16: Rim section 16a: Inner surface of rim 18: Pressure point section 18a: Bottom wall of the pot 18b: Side wall of the pot 20: First outlet 22: Second outlet 28: Recess 28a: Bottom surface of recess 28b: Rear end of recess 28c: Top of the recess 30:Anterior flat area 32: Lateral flat area 34:Protrusion 36: Squeezing section 38: Enlarged section F1: Front mainstream F2: Rear mainstream f1: Vertically rotating flow f2: Push flow R1: First radius of curvature R2: Second radius of curvature W: Reservoir surface X: The central axis of the pressure point in the front-back direction Y: The central axis of the pressure point

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 a pot portion formed below the waste receiving surface and having a water collecting surface formed therein; a water outlet provided in the rim portion and configured to discharge flush water toward the bowl portion; a drainage pipe connected to a bottom wall of the pot portion for discharging waste; having A recess is formed in the bottom wall of the pot portion and extends toward the inlet of the drainage pipe, This flush toilet is characterized in that the recess is provided with a narrowing portion whose width becomes smaller toward the inlet of the drain pipe.

2. 2. The flush toilet according to claim 1, wherein the recess is provided with an enlarged portion behind the narrowed portion, the width of which increases toward the inlet of the drainage pipe.

3. 3. The flush toilet according to claim 2, wherein the rear end of the recess has a width that is approximately the same as the width of the inlet of the drain pipe.

4. 4. The flush toilet according to claim 2 or 3, wherein the constriction portion, when viewed from above, decreases in size with a first radius of curvature toward the inlet of the drainage pipeline, and the expansion portion increases in size with a second radius of curvature toward the inlet of the drainage pipeline, and further wherein the first radius of curvature is smaller than the second radius of curvature.

5. 2. The flush toilet according to claim 1, wherein the throttle portion is located forward of the center of the basin portion in the front-to-rear direction.

6. 2. The flush toilet according to claim 1, wherein the bottom wall of the pot portion has a front flat portion that is a substantially flat surface, on the front side of the recess.

7. 7. The flush toilet according to claim 6, wherein the ratio between the front-to-rear length of the front flat portion and the front-to-rear length of the recess is set to 2:

8.

8. The bottom wall of the pot portion has side flat portions, which are substantially flat surfaces, formed on both the left and right sides of the recess, 8. The flush toilet according to claim 6 or 7, wherein the total length of the horizontal widths of the side flat portions is formed so as to be smaller than the horizontal width of the recessed portion on the front side of the pot portion, and is formed so as to be larger than the horizontal width of the recessed portion on the rear side of the pot portion.

Images