Water closet

Abstract

To provide a water closet capable of improving dirt draining performance even when a reserved water surface is formed larger.SOLUTION: The water closet 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 and a second water discharge port 22, a common conduit 8 for supplying washing water from a washing water source, a first conduit 24 branching from the common conduit 8 for supplying washing water into the first water discharge port 20, a second conduit 26 branching from the common conduit 8 for supplying washing water into the second water discharge port 22, and a drainage line, the common conduit 8 including a bottom face 8b, an upper face 8c, a first lateral face 8d located on the first conduit side, and a second lateral face 8e located on the second conduit side, the common conduit 8 being formed so that a longitudinal width H2 of the second lateral face 8e is greater than a longitudinal width H1 of the first lateral face 8d in the vicinity of a branch point where it branches into the first conduit 24 and the second conduit 26.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, there has been known a flush toilet that includes a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, a basin portion formed below the waste receiving surface within which a water collection surface is formed, first and second water outlets provided in the rim portion and forming a swirling flow, a common water conduit for supplying flush water from a water storage tank, a first water conduit branching off from the common water conduit to supply flush water to the first water outlet, and a second water conduit branching off from the common water conduit to supply flush water to the second water outlet. In this type of flush toilet, flush water from the storage tank is supplied to a common water conduit, then distributed to the first and second water conduits, and discharged from the first and second water outlets. Some of the flush water discharged from the second water outlet flows directly into the pool surface in the basin, and after hitting the bottom wall of the basin, forms a flow that swirls vertically within the basin. This pushes waste into the drainage pipe and is discharged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-50886 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in such flush toilets, 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 before. However, in a flush toilet such as that described in Patent Document 1 mentioned above, when the pooled water surface is made larger than before, the vertically swirling flow within the basin is dispersed, so even if flush water is made to flow directly from the second spout onto the pooled water surface in the basin, a vertically swirling flow sufficient to expel waste cannot be formed. This creates the problem that waste, particularly floating waste that floats on the surface of the pooled water surface, cannot be sufficiently expelled. On the other hand, it is possible to increase the flow rate of flush water discharged from the second outlet by making the second water conduit larger, but making the second water conduit larger shortens the time that water is discharged from the second outlet, making it impossible to form a vertical swirling flow sufficient to discharge waste.In other words, to form a vertical swirling flow sufficient to discharge waste, it is important to increase the flow rate of flush water discharged from the second outlet and to discharge flush water from the second outlet for as long as possible.

[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 object, the present invention is a flush toilet that discharges waste using flush water supplied from a flush water source, the bowl portion comprising a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface and having an inner circumferential surface, and a basin portion formed below the waste receiving surface and having a pooled water surface formed therein, a first water outlet provided in the rim portion and which spouts flush water along the rim portion to form a swirling flow, a second water outlet provided in the rim portion and which spouts flush water in the same direction as the swirling direction of the flush water spouted from the first water outlet, and a flush water outlet provided in the rim portion and which spouts flush water from the flush water source. the first water conduit branching off from the common water conduit to supply flush water to the first outlet; a second water conduit branching off from the common water conduit to supply flush water to the second outlet; and a drain pipe connected to the bottom of the bowl portion, the common water conduit having a bottom surface, a top surface, a first side surface located on the first water conduit side, and a second side surface located on the second water conduit side, the common water conduit being formed such that the vertical width of the second side surface is greater than the vertical width of the first side surface near the branching point where it branches off into the first water conduit and the second water conduit. In the present invention thus configured, the common water conduit is formed so that the vertical width of the second side surface portion is greater than the vertical width of the first side surface portion near the branching point where it branches into the first water conduit and the second water conduit, so that the flow rate of flush water flowing from the common water conduit to the second water outlet can be increased without changing the second water conduit. This increases the flow rate of flush water discharged from the second water outlet, and allows water to be continuously discharged from the second water outlet for a long period of time. This makes it possible to form a vertical swirling flow sufficient to discharge waste, and improves waste discharge performance even when a large pooled water surface is formed.

[0007] In the present invention, the upper end of the second side surface portion of the common water channel is preferably formed to be higher than the upper end of the first side surface portion. In the present invention configured in this manner, the upper end of the second side portion of the common water conduit is formed so as to be higher than the upper end of the first side portion, thereby increasing the flow rate of flush water flowing from the common water conduit to the second water outlet.

[0008] In the present invention, the upper surface portion of the common headrace is preferably inclined downward in the left-right direction on the first headrace side relative to the upper surface portion on the second headrace side. In the present invention configured in this manner, the upper surface of the common water conduit is inclined downward in the left-right direction so that the upper surface on the first water conduit side is more inclined downward than the upper surface on the second water conduit side, so that flush water flowing through the common water conduit can flow more toward the second water conduit side than the first water conduit side.

[0009] Furthermore, in the present invention, the first water conduit is provided with a first throttling section in which the flow path cross-sectional area decreases in the direction in which the cleansing water flows, and the second water conduit is provided with a second throttling section in which the flow path cross-sectional area decreases in the direction in which the cleansing water flows, and the second throttling section is formed so as to be longer in the direction in which the cleansing water flows than the first throttling section. In the present invention configured in this manner, the first water conduit is provided with a first throttling section in which the flow path cross-sectional area decreases in the direction in which the cleansing water flows, and the second water conduit is provided with a second throttling section in which the flow path cross-sectional area decreases in the direction in which the cleansing water flows, and the second throttling section is formed to be longer in the direction in which the cleansing water flows than the first throttling section, so that the cleansing water can be discharged from the second water outlet for a longer period of time.

[0010] In the present invention, preferably, at least a part of the bottom surface of the common water channel is formed as a convex curved surface that is curved so as to protrude upward. In the present invention configured in this manner, at least a portion of the bottom surface of the common water channel is formed as a convex surface that curves so as to protrude upward, so that wash water remaining after washing is discharged through both the left and right sides of the convex surface, preventing wash water from remaining in the common water channel.

[0011] In addition, in the present invention, the first water outlet is preferably provided on one side of the bowl portion in the left-right direction and configured to spray cleansing water forward, and the second water outlet is preferably provided on the other side of the bowl portion in the left-right direction and configured to spray cleansing water rearward. In the present invention configured in this manner, the first water outlet is provided on one side of the bowl portion in the left-right direction and is configured to outlet the cleaning water forward, and the second water outlet is provided on the other side of the bowl portion in the left-right direction and is configured to outlet the cleaning water rearward, so that the cleaning water can be forcefully flowed directly from the second water outlet onto the water surface in the basin portion.

[0012] In the present invention, the common headrace preferably has a minimum flow passage cross-sectional area that is the smallest among all the common headraces. In the present invention thus configured, the common water conduit has a minimum flow path cross-sectional portion which is formed to have the smallest flow path cross-sectional area among all the common water conduits, so that the wash water supplied from the wash water source can be diverted at a constant flow rate to the first water conduit and the second water conduit. Effect of the Invention

[0013] 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]

[0014] [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. 1 is a perspective view showing the entire water channel of a flush toilet according to an embodiment of the present invention. [Figure 4A] FIG. 4 is a cross-sectional view taken along line IVA-IVA in FIG. 3. [Figure 4B] FIG. 4 is a cross-sectional view taken along line IVB-IVB in FIG. [Figure 4C] FIG. 4 is a cross-sectional view taken along the line IVC-IVC in FIG. 3. [Figure 4D] FIG. 4 is a cross-sectional view taken along the line IVD-IVD in FIG. [Diagram 5] FIG. 2 is a rear view of the water channel of a flush toilet according to an embodiment of the present invention, as seen from the rear. [Figure 6] 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

[0015] 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.

[0016] As shown in Figures 1 and 2, the flush toilet 1 is a wash-down toilet in which waste is washed away by the running water caused by the drop in water level within 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 at the front, and a common water conduit 8 having a supply port 8a which communicates with the water storage tank 4 is formed at the upper rear portion of the bowl portion 6. Furthermore, a drainage pipe 10 is formed at the lower rear portion 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.

[0017] 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".

[0018] The above-mentioned water storage tank 4 is equipped with a drain valve 12 that opens and closes the drain outlet 4a of the water storage tank 4, and when the user opens an operating lever (not shown), the drain valve 12 opens and flushing water in the water storage 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.

[0019] The bowl section 6 is provided with a bowl-shaped waste receiving surface 14, a rim section 16 having an inner peripheral surface 16a that rises from the outer edge of the waste receiving surface 14 and is exposed to the outside, and a basin section 18 that is formed below the waste receiving surface 14 and forms 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) that is larger than the water pooling surface W.

[0020] 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 on the lower rear side of the pot portion 18 and protrudes forward.

[0021] A first water outlet 20 that spouts flush water is formed in the rim portion 16 of the bowl portion 6 at a position on the front left side of the bowl portion 6. A second water outlet 22 that spouts flush water is formed at a position on the rear right side of the bowl portion 6. The above-mentioned common water conduit 8 branches downstream into a first water conduit 24 and a second water conduit 26, 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, 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 spouts water toward the front region of the bowl portion 6, and the second water outlet 22 spouts water toward the rear region of the bowl portion 6. The first water outlet 20 and the second water outlet 22 spout flush water in a direction that forms a swirling flow that swirls in the same direction. In this embodiment of the invention, a counterclockwise swirling flow is formed. Also, in this embodiment of the invention, of the amount of flush water supplied from the water storage tank 4 to the common water channel 8, the ratio between the amount of flush water spouted from the first outlet 20 and the amount of flush water spouted from the second outlet 22 is approximately 6:4, which is a greater amount of flush water spouted from the second outlet 22 than in the past. Furthermore, the flush toilet of the present invention may have two or more water outlets (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 headrace of a flush toilet 1 according to an embodiment of the present invention will be explained in detail with reference to Figures 3 to 5. Figure 3 is a perspective view showing the entire headrace of a flush toilet according to an embodiment of the present invention, Figures 4A to 4D are cross-sectional views taken along lines IVA-IVA, IVB-IVB, IVC-IVC, and IVD-IVD, respectively, in Figure 3, and Figure 5 is a rear view of the headrace of a flush toilet according to an embodiment of the present invention, seen from the rear.

[0024] As shown in Figure 3, the water conduits of the flush toilet 1 are equipped with a common water conduit 8 that extends from below the water tank 4 to near the rear side of the bowl portion 6, a first water conduit 24 that branches off from the common water conduit 8 and extends to the first water outlet 20, and a second water conduit 26 that branches off from the common water conduit 8 and extends to the second water outlet 22.

[0025] The common water conduit 8 is formed at its upstream end with a supply port 8a that is connected to the drain outlet 4a of the water storage tank 4, and at its downstream end is branched into a first water conduit 24 and a second water conduit 26. As a result, flush water flowing in from the supply port 8a is diverted into the first water conduit 24 and the second water conduit 26, and is discharged from the first water outlet 20 and the second water outlet 22.

[0026] As shown in Figures 4A to 4D, the common headrace 8 has a cross section that is elongated and flat, and has a substantially constant width D. The common headrace 8 extends linearly in the front-to-rear direction of the toilet body 2. The common headrace 8 comprises a bottom surface portion 8b, which is the bottom surface, a top surface portion 8c located above the bottom surface portion 8b, a first side surface portion 8d connecting the ends of the bottom surface portion 8b and the top surface portion 8c on the first headrace side (left side), and a second side surface portion 8e connecting the ends of the bottom surface portion 8b and the top surface portion 8c on the second headrace side (right side).

[0027] As shown in Fig. 3, the common water conduit 8 is provided with a minimum flow cross section 30 on the upstream side, in which the flow cross section perpendicular to the direction in which the flush water flows is the smallest of all the parts of the common water conduit 8. The minimum flow cross section 30 is located in the vicinity of the supply port 8a. The length in the front-to-rear direction of the minimum flow cross section 30 is set to about 1 / 3 of the length in the front-to-rear direction of the common water conduit 8. In the minimum flow cross section 30, the flow cross section perpendicular to the direction in which the flush water flows is formed to have approximately the same shape. The flush water supplied from the water storage tank 4 passes through the minimum flow cross section 30, so that the flush water supplied from the water storage tank 4 can be made to have a constant flow rate.

[0028] The top surface 8c and bottom surface 8b of the minimum flow path cross-section portion 30 are formed of convex curved surfaces that are curved so as to protrude upward (see FIG. 4A). The convex curved surfaces are formed so that they are highest at the center in the left-right direction and become lower in the left-right direction. Because the bottom surface 8b of the minimum flow path cross-section portion 30 is formed of a convex curved surface, flush water remaining after flushing is discharged through both the left and right sides of the convex curved surface, preventing flush water from remaining in the common water channel 8. Furthermore, the vertical widths H1 and H2 of the first side surface portion 8d of the minimum flow path cross-section portion 30 are formed to be approximately the same size.

[0029] 4B to 4D, the common headrace 8 is formed such that the vertical width H2 of the second side surface portion 8e is greater than the vertical width H1 of the first side surface portion 8d from the downstream end of the minimum flow path cross-section portion 30 to the branching point. This allows the flow rate of flush water flowing into the second headrace 26 to be greater than the flow rate of flush water flowing into the first headrace 24, when the flush water flowing through the common headrace 8 is branched into the first headrace 24 and the second headrace 26.

[0030] The lower end of the first side surface portion 8d and the lower end of the second side surface portion 8e of the common water conduit 8 are formed to be at approximately the same height from the downstream end of the minimum flow path cross-section portion 30 to the branching point, and the upper end of the second side surface portion 8e is formed to be higher than the upper end of the first side surface portion 8d (see Figures 4B to 4D). This makes the flow rate of flush water flowing from the common water conduit 8 to the second water conduit 26 greater than the flow rate of flush water flowing to the first water conduit 24.

[0031] From the downstream end of the minimum flow path cross-section portion 30 to the branch point, the upper surface 8c on the first water conduit side is inclined downward more than the upper surface 8c on the second water conduit side. Specifically, the upper surface 8c is formed so that the center in the left-right direction is highest, and the upper surface 8c on the first water conduit side is inclined downward at a first inclination angle with respect to the horizontal direction, and the upper surface 8c on the second water conduit side is inclined downward at a second inclination angle with respect to the horizontal direction, and further, the first inclination angle is larger than the second inclination angle. This allows flush water flowing through the common water conduit 8 to flow more on the second water conduit side than on the first water conduit side.

[0032] As shown in Fig. 4B, a part of the bottom surface 8b of the common water conduit 8 is formed of a convex curved surface that protrudes upward near the minimum flow path cross-sectional area 30. The convex curved surface is formed so that it is highest at the center in the left-right direction and becomes lower in the left-right direction. The bottom surface 8b of the common water conduit 8 is also inclined downward from the upstream side to the downstream side. This allows washing water remaining after washing to be discharged through both the left and right sides of the convex curved surface, preventing washing water from remaining in the common water conduit 8. In the embodiment of the present invention, the convex curved surface is formed in the left-right center of the bottom surface portion 8b, but this is not limited to this and it may be formed biased to the left or right. In this way, by adjusting the position where the convex curved surface is formed in the left-right direction, it is possible to change the ratio of the flow rate of flush water spouted from the first water outlet 20 to the flow rate of flush water spouted from the second water outlet 22.

[0033] 3, first water conduit 24 branches off from common water conduit 8 near the back side of bowl portion 6, extends forward along left rim portion 16, and extends to first water outlet 20 located at the front left side of bowl portion 6. As a result, flush water supplied from common water conduit 8 to first water conduit 24 flows to the front side of bowl portion 6, and is then discharged from first water outlet 20 in a swirling manner along rim portion 16 and toward waste receiving surface 14.

[0034] 3, the second water conduit 26 branches off from the common water conduit 8 near the back side of the bowl portion 6, extends forward along the right rim portion 16, then makes a U-turn rearward and extends to the second water outlet 22 located at the rear right side of the bowl portion 6. As a result, flush water supplied to the second water conduit 26 from the common water conduit 8 flows forward, then makes a U-turn and flows rearward, and is then discharged from the second water outlet 22 in a swirling manner along the rim portion 16 and toward the water surface W in the basin portion 18.

[0035] 5, first water conduit 24 is provided with first throttle section 32, in which the flow path cross-sectional area decreases in the direction in which flush water flows, near the back side of bowl section 6. First throttle section 32 has a flow path cross-sectional area that gradually decreases as the bottom surface of first water conduit 24 is formed substantially horizontal and the top surface of first water conduit 24 slopes downward in the direction in which flush water flows.

[0036] Second conduit 26 is provided with second throttle section 34, the cross-sectional area of ​​which decreases in the direction in which flush water flows, near the rear side of bowl section 6. Second throttle section 34 has a bottom surface of second conduit 26 formed substantially horizontally in the direction in which flush water flows, and an upper surface of second conduit 26 inclined downward, so that the cross-sectional area of ​​the flow path gradually decreases.

[0037] As shown in Figure 5, the length of the second throttling section 34 in the direction in which the flush water flows is set to be approximately four times longer than the length of the first throttling section 32 in the direction in which the flush water flows. The second throttling section 34, which is formed to be relatively long, applies a pressure loss to the flush water flowing through the second water conduit 26, so that the flush water is discharged from the second water outlet 22 for a long period of time.

[0038] 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 during toilet flushing in a flush toilet 1 according to an embodiment of the present invention.

[0039] As shown in Figure 6, flush water flowing from the water storage tank 4 into the common headrace 8 is branched into the first headrace 24 and the second headrace 26, and flows through the first headrace 24 and the second headrace 26, respectively. At that time, the flush water flows while filling the common headrace 8, the first headrace 24 and the second headrace 26. The flush water that has flowed through the first headrace 24 and the second headrace 26, respectively, is discharged from the first outlet 20 and the second outlet 22, respectively.

[0040] Next, part of the flush water discharged from the first water outlet 20 forms a flow f1 that 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 pool water surface W in the basin portion 18. Meanwhile, part of the flush water discharged from the second water outlet 22 forms a flow f2 that swirls around the inner circumferential surface 16a of the rim portion 16, and the majority flows down to the waste receiving surface 14 to form a rear main flow F2. The rear main flow F2 flows through the rear region of the waste receiving surface 14 of the bowl portion 6 and flows into the pooled water surface W in the basin portion 18.

[0041] Next, part of the cleaning water that flows into the pot portion 18 collides with the front flat portion 18d, the side flat portion 18e, or the protruding portion 18f in the pot portion 18, and is changed into an upward flow, forming a powerful vertically swirling flow F3. As a result, the waste is stirred up and down together with the accumulated water in the pot portion 18 and is pushed into the inlet 10a of the drainage pipe 10. Further, part of the flushing water that flows into the pot portion 18 is collected in a recess 18c in the bottom wall 18a of the pot portion 18, and is pushed into the inlet 10a of the drainage pipe 10 along the recess 18c. This causes floating waste to be forcefully pushed into the drainage pipe 10.

[0042] The effects of the above-described embodiment will now be described. In a flush toilet 1 according to an embodiment of the present invention, the common headrace 8 is formed so that the vertical width H2 of the second side surface portion 8e is greater than the vertical width H1 of the first side surface portion 8d near the branching point where it branches into the first headrace 24 and the second headrace 26, and so the flow rate of flush water flowing from the common headrace 8 to the second outlet 22 can be increased without changing the second headrace 26. This increases the flow rate of flush water discharged from the second outlet 22 and allows water to be continued from the second outlet 22 for a long period of time. A vertical swirling flow sufficient to discharge waste can therefore be formed, and waste discharge performance can be improved even if the pooled water surface W is formed large.

[0043] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the upper end of the second side surface portion 8e of the common water conduit 8 is formed so that it is higher than the upper end of the first side surface portion 8d, making it possible to increase the flow rate of flush water flowing from the common water conduit 8 to the second water outlet 22. Also, the lower end of the first side surface portion 8d and the lower end of the second side surface portion 8e are formed so that they are at approximately the same height, making it possible to prevent flush water from remaining in the common water conduit 8 at the bottom of the common water conduit 8.

[0044] In a flush toilet 1 according to an embodiment of the present invention, the upper surface 8c of the common headrace 8 is inclined left-right so that the upper surface 8c on the first headrace side is tilted downwards more left-right than the upper surface 8c on the second headrace side, so that flush water flowing through the common headrace 8 can flow more toward the second headrace side than toward the first headrace side.

[0045] Furthermore, in the flush toilet 1 according to an embodiment of the present invention, the first water conduit 24 is provided with a first throttling section 32 in which the flow path cross-sectional area decreases in the direction in which the flush water flows, and the second water conduit 26 is provided with a second throttling section 34 in which the flow path cross-sectional area decreases in the direction in which the flush water flows, and the second throttling section 34 is formed so as to be longer in the direction in which the flush water flows than the first throttling section 32, so that flush water can be discharged from the second water outlet 22 for a long period of time.

[0046] In a flush toilet 1 according to an embodiment of the present invention, at least a portion of the bottom surface of the common water channel 8 is formed with a convex surface that curves so that it protrudes upwards, so that flush water remaining after flushing is discharged through both the left and right sides of the convex surface, preventing flush water from remaining within the common water channel 8.

[0047] Furthermore, in the flush toilet 1 according to an embodiment of the present invention, the first water outlet is provided on the left side of the bowl portion and is configured to spray flush water forward, and the second water outlet 22 is provided on the right side of the bowl portion and is configured to spray flush water rearward, so that flush water can be forcefully flowed directly from the second water outlet 22 into the water surface W in the basin portion.

[0048] In a flush toilet 1 according to an embodiment of the present invention, the common water channel 8 is equipped with a minimum flow path cross-sectional section which is formed to have the smallest flow path cross-sectional area of ​​all the parts of the common water channel 8, so that flush water supplied from the flush water source can be diverted at a constant flow rate to the first water channel 24 and the second water channel 26.

[0049] 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]

[0050] 1: Flush toilet 6: Bowl section 8: Common waterway 8a: Supply inlet of common waterway 8b: Bottom part of the common water channel 8c: Top surface of the common waterway 8d: First side of the common waterway 8e: Second side of the common waterway 10: Drainage pipe 10a: Drain pipe inlet 10b: Lead pipe for drainage pipe 10c: Drainage pipe riser 10d: Downstream pipe of drainage pipe 10e: Top of drainage pipe 14: Waste receiving surface 16: Rim section 18: Pressure point section 20: First outlet 22: Second outlet 24: First waterway 26: Second waterway 30: Minimum flow cross section 32: First throttle section 34: Second squeeze section D:Width H1: Vertical width of the first side H2: Vertical width of the second side F1: Front mainstream F2: Rear mainstream F3: Vertically rotating flow W: Reservoir surface

Claims

1. A flush toilet that discharges waste using flush water supplied from a flush water source, a bowl portion including a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface and having an inner peripheral surface, and a pot portion formed below the waste receiving surface and having a water collecting surface formed therein; A first water outlet provided in the rim portion and configured to discharge wash water along the rim portion to form a swirling flow; a second water outlet provided in the rim portion and configured to discharge flush water in the same direction as the swirling direction of flush water discharged from the first water outlet; a common water conduit for supplying wash water from the wash water source; A first water conduit that branches off from the common water conduit and supplies flush water to the first water outlet; A second water conduit that branches off from the common water conduit and supplies flush water to the second water outlet; a drainage pipe connected to the bottom of the bowl; having the common water channel includes a bottom surface portion, a top surface portion, a first side surface portion located on the first water channel side, and a second side surface portion located on the second water channel side; A flush toilet characterized in that the common water channel is formed so that the vertical width of the second side surface portion is greater than the vertical width of the first side surface portion near a branching point where the common water channel branches into a first water channel and a second water channel.

2. 2. The flush toilet according to claim 1, wherein an upper end of the second side surface portion of the common water channel is formed so as to be higher than an upper end of the first side surface portion.

3. 3. The flush toilet according to claim 1, wherein the upper surface portion of the common headrace is inclined downward in the left-right direction on the side of the first headrace with respect to the upper surface portion on the side of the second headrace.

4. the first water passage includes a first throttle portion in which a flow path cross-sectional area is reduced in a direction in which the wash water flows, the second water passage includes a second throttle portion in which a flow path cross-sectional area is reduced in a direction in which the wash water flows, 2. The flush toilet according to claim 1, wherein the second throttle portion is formed so as to be longer in the direction in which flush water flows than the first throttle portion.

5. 2. The flush toilet according to claim 1, wherein at least a portion of the bottom surface of the common water channel is formed with a convex curved surface that protrudes upward.

6. The first water outlet is provided on one side of the bowl portion in the left-right direction and is configured to discharge flush water forward, 2. The flush toilet according to claim 1, wherein the second water outlet is provided on the other left-right side of the bowl portion and is configured to discharge flush water rearward.

7. 2. The flush toilet according to claim 1, wherein the common headrace has a minimum flow path cross-sectional area portion that is formed to have the smallest flow path cross-sectional area of ​​all of the common headrace.

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