Water closet

Abstract

To provide a water closet capable of improving waste discharge performance even when a water surface is formed larger than that in conventional water closets.SOLUTION: A water closet 1 according to the present invention, which discharges waste by wash water supplied from a wash water source, comprises: a bowl part 6 including a bowl-shaped waste receiving surface 14, a rim part 16 formed above the waste receiving surface 14, and a trap part 18 formed below the waste receiving surface 14 and having a water surface W formed therein; a water discharge port 22 provided in the rim part 16 and discharging wash water toward the bowl part 6; and a drainage line 10 connected to a bottom wall 30 of the trap part 18 and discharging the waste, wherein an overhang part 42 extending upward toward the inner side of the trap part 18 is provided on a rear side wall 34 of the trap 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 Document 1, for example, flush toilets have been known that include a waste receiving surface that receives waste, a rim formed above the waste receiving surface, a basin formed below the waste receiving surface and having a pooling surface formed inside, and first and second spouts located in the rim that create a swirling flow. The basin has a bottom wall and side walls that extend upward from the bottom wall, and an inlet for a drainage pipe that discharges waste is formed behind the bottom wall of the basin. In such a flush toilet, the flush water discharged from the second outlet flows directly into the pool surface from the rear of the basin and hits the bottom wall of the basin, creating a vertically swirling flow within the basin, which pushes waste (especially floating waste) into the drainage pipe and discharges it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-50886 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in flush toilets, 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 collecting surface larger than before. However, in the flush toilet of Patent Document 1 mentioned above, if the pooled water surface is made larger than before, flush water that flows directly into the pooled water surface from the rear of the basin may be discharged from the entrance to the drain pipe without hitting the bottom wall of the basin. As a result, a strong vertical swirling flow cannot be formed within the basin, causing the problem of waste remaining behind instead of being discharged. Furthermore, if the water surface is made larger than before, when the water level in the basin rises during toilet flushing, waste will scatter irregularly, resulting in the waste remaining without being expelled.

[0005] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a flush toilet that can improve waste discharge performance even if the water pooling surface is made larger than before. [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 flush water supplied from a flush water source, and has a bowl portion equipped with a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a basin portion formed below the waste receiving surface and having a water collection surface formed inside it, a water outlet provided in the rim portion that discharges flush water toward the bowl portion, and a drainage pipe connected to the bottom wall of the basin portion that discharges waste, and an overhang portion is provided on the rear side wall of the basin portion that extends upward toward the inside of the basin portion. In the present invention configured as described above, the rear side wall of the basin is provided with an overhang that extends upward toward the inside of the basin. In the early stages of flushing, the overhang causes flush water to land on the pool surface further forward than in conventional systems and hit the bottom wall, creating a powerful vertical swirling flow within the basin. Furthermore, in the middle stages of flushing, the overhang can hold back flush water and waste that attempts to overflow from the basin, preventing waste from scattering. Therefore, even if the water pooling surface is formed larger than before, the waste discharge performance can be improved.

[0007] In the present invention, the overhang portion is preferably provided above the water level of the pooled water before the start of toilet flushing. In the present invention configured in this way, the overhang portion is located above the water level of the pool before the toilet flush begins, so that in the early stages of flushing, flush water passing over the overhang portion can land on the pool surface further forward than in conventional methods. Also, in the middle stages of flushing, even if the water level in the basin rises, the overhang portion can prevent waste from scattering.

[0008] In the present invention, the overhang portion is preferably provided above the highest water level of the pooled water surface to which the water level rises during toilet flushing. In the present invention configured in this manner, the overhang portion is located above the highest water level of the pooled water surface to which the water level rises during toilet flushing, so that even if the pooled water level in the basin portion rises during toilet flushing in the middle of the flush, the overhang portion can prevent waste from scattering.

[0009] In the present invention, the overhang portion is preferably provided over the entire area between the left and right ends of the inlet of the drainage pipeline in the left-right direction. In the present invention configured in this way, the overhang portion is provided across the entire area between the left and right ends of the drain pipe inlet in the left-right direction, so that in the early stages of flushing, more flush water can be directed to the front of the pooled water surface than in conventional flushing systems. Also, in the middle stages of flushing, even if the pooled water level in the basin rises during toilet flushing, waste can be more effectively prevented from scattering and directed toward the drain pipe inlet. [Effects of the Invention]

[0010] 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 explanation of the drawings]

[0011] [Figure 1] 1 is a plan view of a flush toilet according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a side cross-sectional view taken along the line II-II in FIG. 1. [Figure 3A] 2 is a partially enlarged cross-sectional view of the bowl portion at the cross section indicated by A in FIG. 1. FIG. [Figure 3B] 2 is a partially enlarged cross-sectional view of the bowl portion taken along the cross section indicated by B in FIG. 1. FIG. [Figure 3C] 2 is a partially enlarged cross-sectional view of the bowl portion taken along the cross section indicated by C in FIG. 1. FIG. [Figure 3D] 2 is a partially enlarged cross-sectional view of the bowl portion taken along the cross section indicated by D in FIG. 1. FIG. [Figure 3E] 2 is a partially enlarged cross-sectional view of the bowl portion taken along the cross section indicated by E in FIG. 1. FIG. [Figure 4] FIG. 2 is a perspective view showing a schematic view of the flow of flush water in the bowl portion of a flush toilet according to an embodiment of the present invention. [Figure 5] FIG. 2 is a side cross-sectional view showing a schematic view of 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 INVENTION

[0012] 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 using Figures 1 and 2. Figure 1 is a plan view of a flush toilet according to an embodiment of the present invention, and Figure 2 is a side cross-sectional view taken along section II-II in Figure 1.

[0013] 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 as the "front-to-back direction," the left-to-right direction as the "left-to-right direction," and the up-to-down direction as the "vertical direction."

[0014] As shown in Figures 1 and 2, flush toilet 1 is a wash-down toilet that flushes away waste by the flowing water caused by the headway of water in the bowl. Flush toilet 1 comprises a ceramic toilet body 2 and a water storage tank 4 that stores flush water for cleaning toilet body 2. A bowl 6 is formed in the front of toilet body 2, and a common water conduit 8 that communicates with water storage tank 4 is formed in the upper rear part of bowl 6. Furthermore, a drainage pipe 10 is formed in the lower rear part of bowl 6 for discharging waste. In the embodiments 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 toilet that discharges waste by siphon action.

[0015] 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, or it may even be one that supplies flush water using a pump.

[0016] The bowl portion 6 comprises 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 collection surface W therein. The water collection surface W of the basin portion 18 is approximately triangular in top view, measuring 160 mm to 180 mm in the front-to-back direction and 125 mm to 145 mm in the left-to-right direction, and is larger (enlarged) than the water collection surface of a conventional wash-down toilet. The basin portion 18 is also 200 mm to 240 mm in the front-to-back direction and 150 mm to 190 mm in the left-to-right direction in top view, forming an approximately triangular shape that is egg-shaped (an oval shape tapering at the front) larger than the water collection surface W.

[0017] A first water outlet 20 that spouts flush water is formed at the front left side of 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 side. 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.

[0018] First water outlet 20 spouts flush water towards the front of bowl portion 6, and second water outlet 22 spouts flush water towards the rear of bowl portion 6. First water outlet 20 and second water outlet 22 are designed to form a swirling flow in the same counterclockwise direction on waste receiving surface 14. Furthermore, in the case of an embodiment of the present invention, of the amount of flush water supplied from water storage tank 4 to common water conduit 8, the ratio between the amount of flush water spouted from first water outlet 20 and the amount of flush water spouted from second water outlet 22 is approximately 6:4, which means that the amount of flush water spouted from second water outlet 22 is greater than in the past. Furthermore, the flush toilet of the present invention may have one water outlet, or may have two or more (for example, three).

[0019] The drainage pipe 10 is equipped with an inlet 10a connected to the bottom wall 30 of the pot portion 18, an introduction pipe 10b extending downward and rearward from the inlet 10a, an ascending pipe 10c extending upward and rearward from the introduction pipe 10b, a descending pipe 10d extending downward and rearward from the ascending pipe 10c, and a top portion 10e located between the descending pipe 10d and the ascending pipe 10c and determining the water level of the pooled water surface W before the start of flushing. The introduction pipe 10b is connected to the bottom wall 30 of the pot portion 18 as a smooth, continuously 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).

[0020] Next, the basin portion 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 3E. Figures 3A to 3E are partially enlarged cross-sectional views of the bowl portion at the cross sections indicated by A to E in Figure 1.

[0021] As shown in Figure 1, the basin portion 18 has a bottom wall 30 that forms the bottom surface, and a side wall 32 that extends substantially vertically upward from the outer edge of the bottom wall 30. In this way, the basin portion 18 is formed into a basin-like shape by the bottom wall 30 and the side wall 32, and is capable of storing water inside. The upper end of the side wall 32 of the basin portion 18 is connected to the lower end of the waste receiving surface 14. In addition, an inlet 10a of the drainage pipe 10 is provided on the rear side of the bottom wall 30 of the basin portion.

[0022] As shown in FIG. 1 , the bottom wall 30 of the basin portion 18 is formed around the inlet 10a of the drainage pipe 10 in a top view. A recess 30a is formed in the bottom wall 30 forward of the inlet 10a of the drainage pipe 10, recessed downward. The recess 30a is formed to extend linearly in the front-to-rear direction from the front toward the inlet 10a of the drainage pipe 10. A front flat portion 30b, which is a flat surface, is formed in the bottom wall 30 forward of the recess 30a. In addition, side flat portions 30c, which are flat surfaces, are formed on both the left and right sides of the recess 30a and the inlet 10a of the drainage pipe 10. The front flat portion 30b and the side flat portions 30c are formed approximately horizontally, so that when flush water flowing into the basin portion 18 collides with them, a vertical swirling flow is formed. In the embodiment of the present invention, the recess 30a is formed in the bottom wall 30 of the pot portion 18, but the entire bottom wall 30 may be formed substantially horizontally without forming the recess 30a.

[0023] The side wall 32 of the pot portion 18 includes a rear wall 34 provided behind the inlet 10a of the drainage pipe 10, and a left wall 36 and a right wall 38 provided from both left and right ends of the rear wall 34 toward the front. The left wall 36 and the right wall 38 are formed so that the distance between them decreases toward the front, and they are joined at their front ends.

[0024] 2, the rear wall 34 has a standing wall 40 that rises in a substantially vertical direction, an overhanging portion 42 that extends upward from the upper end of the standing wall 40 toward the inside of the basin portion 18, and a protruding portion 44 that extends from the lower end of the standing wall 40 toward the inlet 10a of the drain pipe 10. Because the overhanging portion 42 that protrudes toward the inside of the basin portion 18 is provided, in the early stages of flushing, the flush water flowing into the basin portion 18 lands on the pooled water surface W that is further forward than in conventional flushing systems. Furthermore, in the middle stages of flushing, even if the pooled water level in the basin portion 18 rises, the overhanging portion 42 prevents waste from scattering.

[0025] As shown in Figures 2 and 3B to 3D, the overhang portion 42 of the rear wall 34 protrudes from a base end 42a that connects to the upper end of the standing wall 40 toward an innermost portion 42b inside the basin portion 18. The overhang amount d from the base end 42a to the innermost portion 42b of the overhang portion 42 is set to a size that allows flush water flowing into the basin portion 18 to land on the pooled water surface W further forward than in the past, thereby preventing waste from scattering. The overhang amount d of the overhang portion 42 is set to a size that is smaller than the protrusion amount D from the rear end 44a to the front end 44b of the protrusion 44 located below the overhang portion 42. The innermost portion 42b of the overhang portion 42 is located rearward of the front end 44b of the protrusion 44.

[0026] As shown in FIG. 1 and FIGS. 3A-3E, the overhang portion 42 of the rear wall 34 is provided across the entire region X, which is between the left end 10f and the right end 10g of the inlet 10a of the drainage pipe 10 in the left-right direction. The overhang portion 42 is formed so that the overhang amount d is approximately constant across the entire region X (see FIGS. 3B-3D). The overhang portion 42 is formed symmetrically across the central axis that bisects the region in the left-right direction. Because the overhang portion 42 is formed with the overhang amount d in the region X, during the initial stage of flushing, flush water flowing from the region X into the basin portion 18 can land at the pooled water surface W further forward than in the past. Furthermore, during the intermediate stage of flushing, even if the pooled water level in the basin portion 18 rises, the overhang portion 42 formed across the entire region X can prevent waste from scattering.

[0027] As shown in FIG. 2, the overhang portion 42 of the rear wall 34 is located vertically above the water level WL1 of the pooled water surface W before the start of a toilet flush. The overhang portion 42 is also located vertically above the highest water level WL2 of the pooled water surface W to which the water level rises during a toilet flush (see FIG. 5). The overhang portion 42 is also located vertically higher than the front ends of the left and right walls 36 and 38 (see FIG. 2). Because the overhang portion 42 is located at a relatively high position, flush water passing over the overhang portion can land on the pooled water surface W further forward than in the past during the initial flush. Furthermore, even if the pooled water level in the basin 18 rises during the middle of a flush, scattering of waste can be prevented.

[0028] 2 and 3B to 3D, the protruding portion 44 of the rear side wall 34 protrudes from a rear end 44a that connects with the lower end of the standing wall 40 toward the inlet 10a of the drainage pipeline 10. The protruding amount D from the rear end 44a to the front end 44b of the protruding portion 44 is set to be larger than the overhang amount d of the overhang portion 42.

[0029] 1 and 3A to 3E, the protrusion 44 is provided in an area X that is between the left end 10f and the right end 10g of the inlet 10a of the drainage pipe 10 in the left-right direction. Because the protrusion 44 is provided at the lower end of the rear wall 34 in this way, flush water flowing down along the rear wall 34 can be caused to collide with the protrusion 44 and rotate vertically.

[0030] 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 using Figures 4 and 5. Figure 4 is a perspective view that shows schematically the flow of flush water in the bowl portion of a flush toilet according to an embodiment of the present invention, and Figure 5 is a side cross-sectional view that shows roughly the flow of flush water in the bowl portion of a flush toilet according to an embodiment of the present invention.

[0031] As shown in Figures 4 and 5, when flushing begins, flush water is discharged from first water outlet 20 toward the front of bowl portion 6, and flush water is discharged from second water outlet 22 toward the rear of bowl portion 6. At the beginning of flushing, some of the flush water discharged from second water outlet 22 flows and swirls along inner circumferential surface 16a of rim portion 16, and most of the flush water (F1) flows through the rear region of waste receiving surface 14 before flowing from rear wall 34 of basin portion 18 into pooled water level W within basin portion 18. At this time, flush water F1 passes over overhang portion 42 of rear wall 34. Because overhang portion 42 extends toward the inside of basin portion 18, flush water F1 passing through overhang portion 42 can land on pooled water level W further forward than in conventional methods. This prevents flush water F1 from flowing directly into inlet 10a of drain pipe 10.

[0032] The flush water F1 that lands on the pooled water surface W flows diagonally downward and forward, and collides with the front flat portion 30b and the side flat portion 30c of the bottom wall 30 of the basin portion 18 (F2). The flush water F2 that collides with the front flat portion 30b and the side flat portion 30c flows upward, forming a vertical swirling flow. In this way, by the flush water F1 passing through the overhang portion 42, the flush water F1 lands on the pooled water surface W further forward than before, and more flush water F2 collides with the front flat portion 30b and the side flat portion 30c than before. This makes it possible to form a strong vertical swirling flow F2 within the basin portion 18.

[0033] Next, in the middle of the flushing phase, the water level of the water surface W in the basin 18 gradually rises from the water level WL1 before the toilet flush begins, and reaches the highest water level WL2 (see Figure 5). When the water level of the water surface reaches the highest water level WL2, the flush water and waste (especially floating waste) tend to overflow from the basin 18 and scatter onto the waste receiving surface 14. However, because the overhanging portion 42 is formed on the rear side wall 34, the overhanging portion 42 can hold back the flush water and waste that tend to overflow from the basin 18. This prevents the waste from scattering, and it flows toward the inlet 10a of the drain pipe 10 (F3).

[0034] Next, the effects of the flush toilet 1 according to the embodiment of the present invention described above will be explained. First, in the flush toilet 1 according to the embodiment of the present invention, the rear wall 34 of the basin 18 is provided with an overhang 42 that extends upward toward the inside of the basin 18, and so in the early stages of flushing, the overhang 42 causes the flush water to land on the pooled water surface W further forward than before, and more flush water hits the bottom wall 30 than before, creating a powerful vertical swirling flow inside the basin 18. Furthermore, in the middle stages of flushing, the overhang 42 can hold back the flush water and waste that tries to overflow from the basin 18, preventing the waste from scattering and causing it to flow toward the inlet 10a of the drainage pipe 10. Therefore, even if the pooled water surface W is formed larger than before, waste discharge performance can be improved.

[0035] In a flush toilet 1 according to an embodiment of the present invention, the overhang portion 42 is located above the water level WL1 of the pooled water surface W before the toilet flush begins, so that in the early stages of flushing, the flush water passing over the overhang portion 42 can land on the pooled water surface W further forward than in conventional methods. Also, even if the pooled water level in the basin portion 18 rises in the middle of the flush, the overhang portion 42 can prevent waste from scattering.

[0036] Furthermore, according to the flush toilet 1 of the embodiment of the present invention, the overhang portion 42 is located above the highest water level WL2 of the pooled water surface W to which the water level rises during toilet flushing, so that even if the pooled water level in the basin portion 18 rises during toilet flushing in the middle of the flush, the overhang portion 42 can prevent waste from scattering.

[0037] In a flush toilet 1 according to an embodiment of the present invention, the overhang 42 is provided across the entire area between the left end 10f and the right end 10g of the inlet 10a of the drainage pipe 10 in the left-right direction, so that in the early stages of flushing, more flush water can be directed forward onto the pooled water surface W than before. Also, in the middle stages of flushing, even if the pooled water level in the basin 18 rises during toilet flushing, waste can be further prevented from scattering and directed towards the inlet 10a of the drainage pipe 10.

[0038] The present invention is not limited to the above-described embodiments, and various changes and modifications are possible within the scope of the technical concept described in the claims. [Explanation of symbols]

[0039] 1: Flush toilet 6: Bowl section 10: Drainage pipe 10a: Drainage pipe inlet 10f: Left end of the drainage pipe 10g: Right end of the drainage pipe 14: Waste receiving surface 16: Rim 16a: Inner surface of rim 18: Pressure points 20: First outlet 22: Second outlet 30: Bottom wall of the pot 30a: recess 30b: Front flat part 30c: Lateral flat part 32: Side wall of the acupressure point 34: Rear wall 36: Left side wall 38: Right side wall 40: Standing wall 42: Overhang 42a: Base end of overhang 42b: Innermost part of the overhang 44:Protrusion d: Overhang amount of the overhang part D: Protrusion amount of the protrusion W: Reservoir surface WL1: Water level before cleaning begins WL2: Highest water level of the reservoir

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 flush toilet characterized in that an overhang portion is provided on the side wall on the rear side of the pot portion, extending upward toward the inside of the pot portion.

2. 2. The flush toilet according to claim 1, wherein the overhang portion is provided above the water level of the pooled water surface before toilet flushing begins.

3. 3. The flush toilet according to claim 1, wherein the overhang portion is provided above a highest water level of the pooled water surface that is reached when the water level rises during a toilet flush.

4. 2. The flush toilet according to claim 1, wherein the overhang portion is provided over the entire area between the left and right ends of the inlet of the drain pipe in the left-right direction.

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