Water closet

Abstract

To provide a water closet capable of actualizing sufficient washing of a dirt receiving surface and improving dirt draining performance even when a reserved water surface is formed larger.SOLUTION: The water closet for draining dirt with washing water supplied from a washing water source includes a bowl section 6 including a dirt receiving surface 14, a rim part 16, and a pot part 18, a first water discharge port 20 for discharging washing water to the bowl section 6, and a drainage line 10 for draining dirt. In the front side region of the dirt receiving surface 14, a recessed part 32 is formed extending to the pot part 18. In a front sectional view, the recessed part 32 includes an outside recessed portion 34 recessed downward, and an inside recessed portion 36 provided inside the outside recessed portion 34 and recessed below the outside recessed portion 34. The inside recessed portion 36 has a straight line area 38 of which a breadth D and a depth H are almost constant and which extends to the pot part 18.SELECTED DRAWING: Figure 2

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 Documents 1 and 2, 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, a drainage pipe connected to the bottom wall of the basin portion for discharging waste, and a spout provided in the rim portion for spraying flushing water along the rim portion. In such flush toilets, a downwardly recessed portion is formed in the front area of ​​the waste receiving surface, and this recess extends toward the basin. With this configuration, flush water discharged from the spout swirls around the waste receiving surface, then flows into the recessed portion and toward the basin, thereby forcing waste into the drainage pipe and being discharged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-55437 [Patent Document 2] JP 2021-113496 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a flush toilet, in order to prevent waste from adhering to the waste receiving surface, it is conceivable to reduce the area of ​​the waste receiving surface, which is the dry surface, and make the water pool surface larger than before. However, in the flush toilets of Patent Documents 1 and 2 mentioned above, when the pooled water surface is made larger than before, the force pushing waste into the drainage pipe is weakened, causing the waste (especially floating waste) to remain behind without being discharged. Furthermore, if the recess formed in the front region of the waste receiving surface is simply made larger in order to increase the force pushing the waste into the drainage pipe, the cleaning water swirling around the waste receiving surface will flow down into the recess too early and will not reach the entire waste receiving surface, resulting in the problem that the waste receiving surface cannot be adequately cleaned.

[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 adequately clean the waste receiving surface and improve waste discharge performance even if the water pool surface is formed large. [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 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 pipeline connected to the bottom wall of the pit portion for discharging waste, the front region of the waste receiving surface being formed with a recess extending toward the pit portion, the recess comprising, in a front cross-sectional view, an outer recess that is recessed downwards, and an inner recess that is provided inside the outer recess and is recessed downward more than the outer recess, the inner recess having a straight portion whose width and depth are approximately constant and extending toward the pit portion. In the present invention configured as described above, a recess is formed in the front region of the waste receiving surface, extending toward the pot portion, and the recess includes an outer recess that is recessed downward in a front cross-sectional view, and an inner recess that is provided inside the outer recess and is recessed downward from the outer recess. The inner recess has a straight portion that has a substantially constant width and depth and extends toward the pot portion, so that the flush water discharged from the rim spout first flows into the outer recess and is guided to the inner recess while swirling without impairing the swirlability. This allows the flush water to be distributed over the entire waste receiving surface. Next, the flush water that has passed through the outer recess flows into the inner recess and is converted from a swirling flow to a flow toward the pot portion. At this time, the flush water passes through the straight portion, so that it is straightened and flows vigorously toward the pot portion in a bundle. This allows the waste to be pushed forcefully into the drain pipe. Therefore, the waste receiving surface can be thoroughly cleaned and waste discharge performance can be improved.

[0007] In the present invention, the outer recess preferably has a substantially flat surface, and the inner recess preferably has a concave curved surface formed downward with a predetermined radius of curvature. In the present invention configured in this manner, the outer recess has a substantially flat surface, and the inner recess has a concave curved surface formed with a predetermined radius of curvature facing downward, so that the cleaning water flowing into the outer recess is guided to the inner recess while swirling without impairing its swirling ability, and the cleaning water flowing into the inner recess is converted from a swirling flow to a flow toward the pot portion.

[0008] In the present invention, the inner recess preferably includes a front enlarged portion formed so that its lateral width increases from the front end of the straight portion toward the front. In the present invention configured in this manner, the inner recess is provided with a front expansion section whose width increases as it moves forward from the front end of the straight section, so that a large amount of cleaning water flows in from the front expansion section and flows through the straight section, forming a larger bundle of water that can be forcefully flowed toward the acupressure point.

[0009] In the present invention, the inner recess preferably includes a rear expanded portion formed so that its lateral width increases rearward from the rear end of the straight portion. In the present invention configured in this manner, the inner recess is provided with a rear expansion section whose width increases as it moves rearward from the rear end of the straight section, so that cleaning water can be made to flow from the inner recess toward a wide area of ​​the nib, and cleaning water that overflows from the nib and attempts to spread can be pushed back into the nib.

[0010] In the present invention, the width of the outer recess is preferably formed so as to be smallest at the front end and to increase toward the rear. In the present invention configured in this manner, the width of the outer recess is formed so that it is smallest at the front end and becomes larger toward the rear, so that at the beginning of cleaning, the cleaning water passing through the front side of the outer recess swirls without compromising its turning ability, allowing the cleaning water to spread over the entire waste receiving surface.

[0011] In the present invention, preferably, the lateral width of the outer recess is increased at a first enlargement rate on the front side and increased at a second enlargement rate smaller than the first enlargement rate on the rear side. In the present invention configured in this manner, the width of the outer recess is larger at the front side at a first magnification rate and larger at the rear side at a second magnification rate smaller than the first magnification rate, thereby reducing the area in which the outer recess is formed at the rear side and allowing the cleaning water to be carried onto the waste receiving surface and swirled.

[0012] In the present invention, the width of the outer recess is preferably formed so as to be greatest at the front end and to become smaller toward the rear. In the present invention configured in this manner, the width of the outer recess is formed so that it is widest at the front end and becomes smaller toward the rear. Therefore, at the beginning of cleaning, a large amount of cleaning water flows into the outer recess from the front and toward the pot portion, forming a larger bundle of flow toward the pot portion.

[0013] In the present invention, preferably, the lateral width of the outer recess is reduced at a first reduction rate on the front side and reduced at a second reduction rate larger than the first reduction rate on the rear side. In the present invention configured in this manner, the width of the outer recess is reduced at the front by a first reduction rate and at the rear by a second reduction rate greater than the first reduction rate, thereby reducing the area in which the outer recess is formed at the rear and allowing the cleaning water to be carried onto the waste receiving surface and swirled.

[0014] In the present invention, the upper edge of the waste receiving surface preferably has a substantially flat surface in the front region of the waste receiving surface. In the present invention configured in this manner, the upper edge of the waste receiving surface has an almost flat surface in the front region of the waste receiving surface, so that at the beginning of cleaning, the cleaning water flowing along the upper edge swirls without compromising its swirlability, allowing the cleaning water to spread over the entire waste receiving surface.

[0015] In the present invention, the front end of the inner recess is preferably located at the same position as the front end of the outer recess or rearward of the front end of the inner recess in the front-rear direction. In the present invention configured in this manner, the front end of the inner recess is positioned in the fore-and-aft direction at the same position as the front end of the outer recess or further rearward than the front end of the inner recess, so that at the beginning of cleaning, the cleaning water passing through the front end of the outer recess swirls without compromising its maneuverability, allowing the cleaning water to spread over the entire waste receiving surface.

[0016] Also, in the present invention, the water spout is preferably located at the front left side of the bowl portion, and is configured so that flush water is spouted from the water spout along the inner circumferential surface of the rim portion. In the present invention configured in this manner, the water outlet is positioned on the front left side of the bowl portion and is configured so that cleaning water is discharged from the water outlet along the inner surface of the rim portion, so that the cleaning water discharged from the water outlet positioned on the front left side of the bowl portion can be spread over the entire waste receiving surface. Effect of the Invention

[0017] According to the flush toilet of the present invention, it is possible to provide a flush toilet that can adequately clean the waste receiving surface and improve waste discharge performance even if the pooling surface is formed large. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a side cross-sectional view of a flush toilet according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a plan view of a flush toilet according to a first embodiment of the present invention. [Diagram 3] 3 is a front cross-sectional view in which the waste receiving surfaces of the bowl portion in the cross sections shown in A to H in FIG. 2 are superimposed. [Figure 4] FIG. 4 is a partially enlarged view of FIG. [Diagram 5] 3 is a partially enlarged cross-sectional view taken along the line VV in FIG. 2. [Figure 6] FIG. 2 is a diagram showing generally the flow of flush water within the bowl portion of a flush toilet according to a first embodiment of the present invention. [Figure 7] FIG. 4 is a plan view of a flush toilet according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a plan view of a flush toilet according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a plan view of a flush toilet according to a fourth embodiment of the present invention. [Figure 10] FIG. 11 is a plan view of a flush toilet according to a fifth embodiment of the present invention. [Figure 11] FIG. 13 is a plan view of a flush toilet according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Below, we will explain a flush toilet 1 according to a first 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 cross-sectional view of a flush toilet according to the first embodiment of the present invention, and Figure 2 is a plan view of a flush toilet according to the first embodiment of the present invention.

[0020] 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 "horizontal direction", and the up-down direction will be described as the "vertical direction".

[0021] 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 first 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 siphon type toilets that discharge waste by siphon action.

[0022] 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.

[0023] The bowl portion 6 is provided with a bowl-shaped waste receiving surface 14, a rim portion 16 formed above the waste receiving surface 14 and having an inner peripheral surface 16a exposed to the outside, and a basin portion 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 portion 18 is substantially triangular in top 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 portion 18 is also 200mm to 240mm in the front-to-back direction and 150mm to 190mm in the lateral direction in top view, forming a substantially egg-shaped (elliptical shape tapered at the front) triangle larger than the water pooling surface W.

[0024] A first water outlet 20 (water outlet) that spouts flush water is formed at a left front position on the rim portion 16 of the bowl portion 6, and a second water outlet 22 (water outlet) that spouts flush water is formed at a right rear 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.

[0025] 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 first 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).

[0026] The pot portion 18 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 18c formed to be recessed downward, a front flat portion 18d that is a substantially flat surface formed in front of the recess 18c, side flat portions 18e that are substantially flat surfaces formed on both the left and right sides of the recess 18c, and a protruding portion 18f that is formed below the rear side of the pot portion 18 and protrudes forward. The recess 18c of the pot portion 18 extends linearly toward the inlet 10a of the drainage pipe 10 (see FIG. 2).

[0027] 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).

[0028] Next, the waste receiving surface 14 of the bowl portion 6 of the flush toilet 1 according to the first embodiment of the present invention will be described in detail with reference to Figures 1 to 5. Figure 3 is a front cross-sectional view in which the waste receiving surface 14 of the bowl portion 6 at the cross sections shown in A to H of Figure 2 is superimposed, Figure 4 is a partially enlarged view of Figure 3, and Figure 5 is a partially enlarged cross-sectional view at the VV cross section of Figure 2. 2 and 3 is a center line that divides the bowl portion of the toilet body in half in the left-right direction.

[0029] 3, a convex curved surface 30 that is formed to be convex upward in a front cross-sectional view is formed on the upper part of the waste receiving surface 14 of the bowl portion 6. The flush water discharged from the first water discharge port 20 and the second water discharge port 22 swirls on this convex curved surface 30, so as to wash the entire waste receiving surface 14.

[0030] 2, a recess 32 is formed in the front region of the waste receiving surface 14 (the waste receiving surface 14 between the front end 14a of the waste receiving surface 14 and the front end 18g of the basin portion 18) so as to be recessed downward from the convex curved surface 30. The recess 32 is formed symmetrically about the center line C, and extends from near the front end 14a of the waste receiving surface 14 toward the basin portion 18. Because the recess 32 is recessed downward, flush water swirling on the waste receiving surface 14 is likely to collect in the recess 32.

[0031] As shown in FIG. 2 and FIG. 3, the recess 32 includes an outer recess 34 that is recessed downward, and an inner recess 36 that is provided inside the outer recess 34 and is recessed downward from the outer recess 34. The outer recess 34 and the inner recess 36 are formed symmetrically with respect to the center line C. The outer recess 34 includes a substantially flat flat surface 34a. The inner recess 36 includes a concave curved surface 36a formed with a radius of curvature R at the center bottom surface, which is the deepest part, downward, forming a surface that is recessed one step from the flat surface 34a of the outer recess 34. Since the outer recess 34 includes the flat surface 34a, the washing water that flows into the outer recess 34 is guided to the inner recess 36 while swirling without impairing the swirling property. On the other hand, since the inner recess 36 includes the concave curved surface 36a, the washing water that flows into the inner recess 36 is converted from a swirling flow to a flow toward the inside of the pot portion 18. The boundary between the convex curved surface 30 and the outer recess 34 is the inflection point p1 between the convex curved surface 30 and the flat surface 34a, and the boundary between the outer recess 34 and the inner recess 36 is the inflection point p2 between the flat surface 34a and the concave curved surface 36a.

[0032] As shown in FIG. 2, the width of the outer recess 34 (the width between the upper left end and the upper right end of the outer recess 34) is set so that the front side is enlarged at a first magnification rate and the rear side is enlarged at a second magnification rate, and the second magnification rate is smaller than the first magnification rate. In other words, the upper left end and the upper right end (inflection point p1) of the outer recess 34 are inclined rearward and outward at a first inclination angle α1 (about 20 degrees) with respect to the front-rear direction in a top view, and are inclined rearward and outward at a second inclination angle α2 (about 2 degrees) with respect to the front-rear direction on the rear side. The second inclination angle α2 is set to be smaller than the first inclination angle α1 (α2<α1). In this way, the width of the outer recess 34 is enlarged at the rear side at a second magnification rate smaller than the first magnification rate, so that the area where the outer recess 34 is formed can be reduced and the area S1 formed by the convex curved surface 30 can be increased, compared to the case where the entire area of ​​the outer recess 34 is enlarged at the first magnification rate. This allows the wash water to be carried on the convex curved surface 30 and swirled.

[0033] The width of the outer recess 34 at the front end 34b of the outer recess 34 is the smallest among the outer recesses 34, and is formed to be approximately the same as the width of the inner recess 36 at the front end 36b of the inner recess 36. The width of the outer recess 34 at the rear end 34c of the outer recess 34 is the largest among the outer recesses 34, and is formed to be approximately the same as the maximum width of the water surface W. The depth of the outer recess 34 gradually increases toward the pot portion 18 (see FIG. 4).

[0034] 2 and 4, the inner recess 36 has a straight portion 38 that extends toward the pot portion 18 with a substantially constant width D (the width between the upper left end and the upper right end of the inner recess 36) and depth H, and a front enlarged portion 40 that is provided in front of the straight portion 38 and has a larger width than the straight portion 38. The rear end 36c of the inner recess 36 is connected to the front end 18g of the pot portion 18, and the front end 36b of the inner recess 36 is connected to the upper edge 14b of the waste receiving surface 14. The front end 36b of the inner recess 36 is disposed near the front end 14a of the waste receiving surface 14 in the front-rear direction, and is disposed rearward of the front end 34b of the outer recess 34 (see FIG. 2). Furthermore, in the case of the flush toilet 1 of the first embodiment, the front end 36b of the inner recess 36 is positioned rearward of the front end 34b of the outer recess 34, but it may also be positioned in the same position as the front end 34b of the outer recess 34.

[0035] The straight portion 38 of the inner recess 36 extends linearly along the center line C toward the pot 18 (see FIG. 2). In a front cross-sectional view, the straight portion 38 is formed so that its central bottom surface, which is its deepest part, faces downward with a radius of curvature R, and its depth H is approximately constant (see FIG. 4). In addition, in a side cross-sectional view, the straight portion 38 has its central bottom surface inclined downward toward the pot 18 (see FIG. 1). In this way, the straight portion 38 has a substantially constant width D and depth H, and is inclined downward toward the pot 18, so that the flush water that flows into the straight portion 38 is straightened and flows vigorously toward the pot 18 in a bundle.

[0036] 2, the width of the straight portion 38 of the inner recess 36 is formed to be smaller than the width of the recess 18c formed in the bottom wall 18a of the pot portion 18 in a top view. This makes it easier for flushing water to flow from the straight portion 38 of the inner recess 36 into the recess 18c of the pot portion 18. The flushing water that flows into the recess 18c of the pot portion 18 flows along the recess 18c of the pot portion 18 and is led to the inlet 10a of the drain pipe 10.

[0037] The front expansion portion 40 of the inner recess 36 extends forward from the front end 38a of the straight portion 38 along the center line C (see FIG. 2). In top view, the width of the front expansion portion 40 increases from the front end 38a of the straight portion 38 to the front while drawing an arc with a curvature radius r (see FIGS. 2 and 4). In other words, the front expansion portion 40 is formed so as to expand radially toward the front from the front end 38a of the straight portion 38. The width of the front expansion portion 40 at the front end 40a of the front expansion portion 40 is formed so as to be the largest in the inner recess 36, and is formed so as to be substantially the same as the width of the outer recess 34 at the front end 34b of the outer recess 34. In this way, the width of the inner recess 36 increases from the front end 38a of the straight portion 38 to the front, so that cleaning water can easily flow from the front expansion portion 40 into the inner recess 36.

[0038] In a front cross-sectional view, the front expanded portion 40 of the inner recess 36 has a central bottom surface, which is its deepest part, formed with the same radius of curvature R as the straight portion 38, and is formed with the same depth H as the straight portion 38 (see FIG. 4). In addition, in a side cross-sectional view, the central bottom surface of the front expanded portion 40 is inclined downward toward the pot portion 18 at the same inclination angle as the straight portion 38 (see FIG. 1).

[0039] Next, as shown in FIG. 5, a substantially flat flat surface 14c is formed on the upper edge 14b of the waste receiving surface 14 in the front region of the waste receiving surface 14. The flat surface 14c is inclined downward toward the internal space of the bowl portion. The flat surface 14c is provided between the front end 14a of the waste receiving surface 14 and the front end 36b of the inner recess 36 in the front-rear direction. The flat surface 14c is provided along the inner peripheral surface 16a of the rim portion 16, and is provided over substantially the entire front region of the waste receiving surface 14 (the shaded portion in FIG. 6). In this way, since the flat surface 14c is formed on the front side of the recess 32, in the early stage of flushing, flush water discharged from the first water discharge port 20 passes through the flat surface 14c and can swirl without impairing the swirlability.

[0040] 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 diagram showing roughly the flow of flush water within the bowl portion of a flush toilet according to an embodiment of the present invention.

[0041] 6, first, in the initial stage of flushing, flush water F1 spouted from the first water outlet 20 and flush water F2 spouted from the second water outlet 22 swirl around the upper edge 14b of the waste receiving surface 14 along the inner circumferential surface 16a of the rim portion 16. At this time, in the front region of the waste receiving surface 14, flush water F1 spouted from the first water outlet 20 passes over the flat surface 14c formed on the upper edge 14b of the waste receiving surface 14, so it swirls without losing its swirlability and flows to the rear region of the waste receiving surface 14.

[0042] Next, in the middle of the flushing stage, the flush water that has been discharged from the first water outlet 20 and has traveled around the waste receiving surface 14 joins with the flush water that has been discharged from the second water outlet 22 (F3) and flows into the outer recess 34 on the left side (F4).

[0043] The flush water that flows into the left outer recess 34 is guided to the inner recess 36 while swirling without impairing its swirlability (F4). At this time, some of the flush water passes through the inner recess 36 and swirls toward the right outer recess 34 (F5). This allows the flush water to spread over the entire waste receiving surface 14, allowing the waste receiving surface 14 to be thoroughly cleaned.

[0044] The flush water that flows into the inner recess 36 is converted from a swirling flow to a flow toward the pot portion 18, and flows along the inner recess 36 toward the pot portion 18. At this time, the flush water passes through the straight portion 38, whereby the flow is straightened and a main flow that flows forcefully in a bundle toward the pot portion 18 is formed (F6). In addition, since the front expanded portion 40 is formed in front of the straight portion 38, a large amount of flush water flows into the straight portion 38 from the front. As a result, a main flow that forms a larger bundle can be formed and can flow forcefully toward the pot portion 18.

[0045] The main flow F6 that flows into the basin portion 18 flows into the recess 18c of the basin portion 18 and flows along the recess 18c to the inlet 10a of the drainage pipe 10 (F7). This allows the waste (especially floating waste) to be forcefully pushed into the drainage pipe, improving the waste discharge performance.

[0046] Next, the effects of the flush toilet 1 according to the first embodiment of the present invention described above will be explained. First, according to the flush toilet 1 according to the first embodiment of the present invention, a recess 32 is formed in the front region of the waste receiving surface 14, extending toward the basin portion 18. In a front cross-sectional view, this recess 32 comprises an outer recess 34 that is recessed downward, and an inner recess 36 that is provided inside the outer recess 34 and recesses downward more than the outer recess 34. The inner recess 36 comprises a straight portion 38 that extends toward the basin portion 18 with a substantially constant width D and depth H. For this reason, flush water discharged from the first water outlet 20 and the second water outlet 22 first flows into the outer recess 34, and is guided to the inner recess 36 while swirling without impairing the swirling ability. This allows flush water to be distributed over the entire waste receiving surface 14. Next, flush water that has passed through the outer recess 34 flows into the inner recess 36, and the swirling flow is converted into a flow toward the basin portion 18. At this time, the flush water passes through the straight section 38, and is straightened, forming a bundle that flows vigorously toward the basin section 18. This makes it possible to forcefully push the waste into the drainage pipe 10. This makes it possible to thoroughly clean the waste receiving surface 14 and improve the waste discharge performance.

[0047] According to the flush toilet 1 according to the first embodiment of the present invention, the outer recess 34 is provided with a nearly flat surface 34a, so that flush water that flows into the outer recess 34 is led to the inner recess 36 while swirling without compromising its swirling ability. Also, because the inner recess 36 is provided with a concave curved surface 36a facing downwards and formed with a radius of curvature R, the flush water that flows into the inner recess 36 is converted from a swirling flow to a flow heading towards the basin portion.

[0048] Furthermore, according to the flush toilet 1 of the first embodiment of the present invention, the inner recess 36 is equipped with a front expansion section 40 that is formed so that its width increases from the front end 38a of the straight section 38 to the front, and as a result more flush water flows in from the front expansion section 40 and flows through the straight section 38, it forms a larger bundle of flow and can be forcefully flowed towards the basin section 18.

[0049] According to the flush toilet 1 of the first embodiment of the present invention, the width of the outer recess 34 is formed so that it is smallest at the front end 34b and increases towards the rear, so that at the beginning of the flush, the flush water passing the front side of the outer recess 34 swirls without compromising its swirling ability, allowing the flush water to spread over the entire waste receiving surface 14.

[0050] Furthermore, with the flush toilet 1 according to the first embodiment of the present invention, the width of the outer recess 34 is increased at the front by a first expansion rate, and at the rear by a second expansion rate that is smaller than the first expansion rate, so compared to when the entire area of ​​the outer recess 34 is increased by the first expansion rate, it is possible to reduce the area in which the outer recess 34 is formed, and increase the area S1 formed by the convexly curved surface 30. This allows flush water to be carried on the convexly curved surface 30 and swirled.

[0051] In the flush toilet 1 according to the first embodiment of the present invention, the upper edge 14b of the waste receiving surface 14 has a nearly flat surface 14c in the front region of the waste receiving surface 14, so that at the beginning of the flush, the flush water flowing along the upper edge 14b swirls without compromising its swirling ability, allowing the flush water to spread over the entire waste receiving surface 14.

[0052] Furthermore, according to the flush toilet 1 of the first embodiment of the present invention, the front end 36b of the inner recess 36 is positioned in the front-to-rear direction at the same position as the front end 34b of the outer recess 34 or further rearward than the front end 36b of the inner recess 36, so that at the beginning of flushing, the flush water passing through the front end 34b of the outer recess 34 swirls without compromising its swirling ability, allowing the flush water to spread over the entire waste receiving surface 14.

[0053] According to the flush toilet 1 of the first embodiment of the present invention, the first water outlet 20 is positioned on the front left side of the bowl portion 6 and is configured so that flushing water is discharged from the first water outlet 20 along the inner surface 16a of the rim portion 16, so that the flushing water discharged from the first water outlet 20 positioned on the front left side of the bowl portion 6 can be spread over the entire waste receiving surface 14.

[0054] Next, a flush toilet 100 according to a second embodiment of the present invention will be explained with reference to FIG. FIG. 7 is a plan view of a flush toilet according to the second embodiment of the present invention. The flush toilet 100 of the second embodiment differs from the first embodiment described above in that the entire area of ​​the inner recess 136 extends in a straight line. Therefore, below, only the points that differ from the first embodiment will be explained, and explanations of similar configurations, actions, and effects will be omitted.

[0055] 7, the inner recess 136 has a substantially constant width D from the front end 136b to the rear end 136c and extends linearly toward the pot portion 18. The front end 136b of the inner recess 136 is located near the front end 34b of the outer recess 34, and the rear end 136c of the inner recess 136 is located near the front end of the pot portion 18.

[0056] Next, a flush toilet 200 according to a third embodiment of the present invention will be explained with reference to FIG. FIG. 8 is a plan view of a flush toilet according to a third embodiment of the present invention. The flush toilet 200 of the third embodiment differs from the first embodiment described above in that the inner recess 236 is equipped with a rear expanded portion 240. Therefore, below, only the points that differ from the first embodiment will be explained, and explanations of similar configurations, actions, and effects will be omitted.

[0057] 8, the inner recess 236 has a straight portion 238 having a substantially constant width D that extends toward the pot portion 18, and a rear expanded portion 240 that is provided on the rear side of the straight portion 238 and has a wider width than the straight portion 238. A front end 236b of the inner recess 236 is disposed near the front end 34b of the outer recess 34, and a rear end 236c of the inner recess 236 is disposed near the front end of the pot portion 18.

[0058] The rear expanded portion 240 of the inner recess 236 extends rearward from the rear end 238a of the straight portion 238 along the center line C. In a top view, the rear expanded portion 240 has a width that increases from the rear end 238a of the straight portion 238 toward the rear while describing an arc with a curvature radius r. In other words, the rear expanded portion 240 is formed so as to radially expand toward the rear from the rear end 238a of the straight portion 238 as a center. The width of the front end 236b of the inner recess 236 is the smallest in the inner recess 236, and the width of the rear end 236c of the inner recess 236 is formed so as to be the largest in the inner recess 236.

[0059] According to the flush toilet 1 of the third embodiment of the present invention, the inner recess 236 is equipped with a rear expanding section 240 which is formed so that its width increases the further rearward from the rear end 238a of the straight section 238, so that flush water can be directed from the inner recess 236 towards a wide area of ​​the jar portion 18, and flush water which tries to overflow from the jar portion 18 and spread out can be pushed into the jar portion 18.

[0060] Next, a flush toilet 300 according to a fourth embodiment of the present invention will be explained with reference to FIG. FIG. 9 is a plan view of a flush toilet according to the fourth embodiment of the present invention. The flush toilet 300 of the fourth embodiment differs from the first embodiment described above in that the width of the outer recess 334 is formed to become smaller the further rearward it is. Therefore, below, only the points that differ from the first embodiment will be explained, and explanations of similar configurations, actions, and effects will be omitted.

[0061] 9, the width of the outer recess 334 is set so that the front side is narrowed by a first reduction ratio and the rear side is narrowed by a second reduction ratio, the second reduction ratio being greater than the first reduction ratio. In other words, the left upper end and the right upper end of the outer recess 34 are inclined rearward and inward at a first inclination angle β1 (about 2 degrees) with respect to the front-rear direction in a top view, and the rear sides are inclined rearward and inward at a second inclination angle β2 (about 20 degrees) with respect to the front-rear direction. The second inclination angle β2 is set to be greater than the first inclination angle β1 (β2>β1).

[0062] The lateral width of the outer recess 334 at the front end 334b ​​of the outer recess 334 is formed to be the largest among all the outer recesses 334, and the lateral width of the outer recess 334 at the rear end 334c of the outer recess 334 is formed to be the smallest among all the outer recesses 334.

[0063] According to the flush toilet 1 of the fourth embodiment of the present invention, the width of the outer recess 334 is formed so that it is greatest at the front end 334b ​​and becomes smaller towards the rear, so that at the beginning of the flush, a lot of flush water flows into the outer recess 334 from the front and flows towards the jar portion 18, forming a larger bundle of flow towards the jar portion 18.

[0064] Furthermore, with the flush toilet 1 according to the fourth embodiment of the present invention, the width of the outer recess 334 is reduced at the front by a first reduction rate and at the rear by a second reduction rate greater than the first reduction rate, so compared to when the entire area of ​​the outer recess 34 is reduced at the first reduction rate, it is possible to reduce the area at the rear where the outer recess 34 is formed and increase the area S2 formed by the convex curved surface 30. This allows flush water to be carried on the convex curved surface 30 of the waste receiving surface 14 and swirled.

[0065] Next, a flush toilet 400 according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a plan view of a flush toilet according to the fifth embodiment of the present invention. The flush toilet 400 of the fifth embodiment differs from the first embodiment described above in that the entire area of ​​the inner recess 136 extends in a straight line, and that the width of the outer recess 334 is formed so as to become smaller towards the rear, but these points are the same as those of the second and fourth embodiments described above.

[0066] Next, a flush toilet 500 according to a sixth embodiment of the present invention will be explained with reference to FIG. FIG. 11 is a plan view of a flush toilet according to the sixth embodiment of the present invention. The flush toilet 500 of the sixth embodiment differs from the first embodiment described above in that the inner recess 236 is equipped with a rear expanded portion 240, and in that the width of the outer recess 334 is formed so as to become smaller toward the rear, but these points are the same as the third and fourth embodiments described above.

[0067] 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]

[0068] 1: A flush toilet according to a first embodiment of the present invention 6: Bowl section 10: Drainage pipe 10a: Drain pipe inlet 14: Waste receiving surface 14a: Front end of waste receiving surface 14b: Upper edge of waste receiving surface 14c: flat surface 16: Rim section 16a: Inner surface of rim 18: Pressure point section 18c: Concave part of the acupressure point 18g: Front end of the pressure point 20: First outlet 22: Second outlet 30: Convex curved surface 32: Recess 34: Outer recess 34a:Flat surface 34b: Front end of outer recess 34c: Rear end of outer recess 36: Inner recess 36a: Concave curved surface 36b: Front end of inner recess 36c: Rear end of inner recess 38: Straight section 38a: Front end of straight section 40: Front expansion 40a: Front end of front expansion part 100: Flush toilet according to a second embodiment of the present invention 200: Flush toilet according to the third embodiment of the present invention 300: Flush toilet according to the fourth embodiment of the present invention 400: Flush toilet according to the fifth embodiment of the present invention 500: Flush toilet according to the sixth embodiment of the present invention C: Center line of bowl D: Width of straight section H: Depth of straight section W: Reservoir surface

Claims

1. A flush toilet that discharges waste using flush water supplied from a flush water source, A bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface; a bowl portion including 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 a front region of the waste receiving surface, the recess extending toward the pot portion, The recess includes an outer recess that is recessed downward in a front cross-sectional view, and an inner recess that is provided inside the outer recess and recessed downward more than the outer recess, This flush toilet is characterized in that the inner recess has a linear portion whose width and depth are nearly constant and which extends toward the basin portion.

2. 2. The flush toilet according to claim 1, wherein the outer recess has a substantially flat surface, and the inner recess has a concave curved surface formed with a predetermined radius of curvature facing downward.

3. 2. The flush toilet according to claim 1, wherein the inner recess is provided with a front expanding portion formed so that its width increases from the front end of the straight portion toward the front.

4. 2. The flush toilet according to claim 1, wherein the inner recess is provided with a rear expanded portion formed so that its width increases rearward from the rear end of the straight portion.

5. 5. The flush toilet according to claim 1, wherein the width of the outer recess is formed so as to be smallest at the front end and so as to increase towards the rear.

6. 6. The flush toilet according to claim 5, wherein the lateral width of the outer recess increases at a first enlargement rate on the front side and increases at a second enlargement rate smaller than the first enlargement rate on the rear side.

7. 5. The flush toilet according to claim 1, wherein the width of the outer recess is formed so as to be greatest at the front end and gradually decrease towards the rear.

8. 8. The flush toilet according to claim 7, wherein the lateral width of the outer recess is reduced at a first reduction rate on the front side and at a second reduction rate on the rear side that is greater than the first reduction rate.

9. 2. The flush toilet of claim 1, wherein an upper edge of the waste-receiving surface comprises a substantially flat planar surface in a front region of the waste-receiving surface.

10. 2. The flush toilet according to claim 1, wherein a front end of the inner recess is located at the same position as a front end of the outer recess or rearward of the front end of the inner recess in the front-to-rear direction.

11. 2. The flush toilet according to claim 1, wherein the water outlet is disposed at the front left side of the bowl portion, and is configured so that flush water is discharged from the water outlet along the inner circumferential surface of the rim portion.

Images