Flush toilet

Abstract

To provide a water closet that can improve washing performance of an excretion-receiving surface.SOLUTION: A water closet in this embodiment comprises a bowl part, a trap pipeline, a first water discharge port, a first rim water channel, a second water discharge port, and a second rim water channel. The bowl part comprises: a bowl-shaped excretion-receiving surface to receive excretion; and a rim part that extends upward at an upper edge part of the excretion-receiving surface. The trap pipeline extends from a bottom part to discharge the excretion received on the excretion-receiving surface. The first water discharge port forms a first flow of washing water which revolves on the excretion-receiving surface. The first rim water channel allows the washing water to flow to the first water discharge port. The second water discharge port forms a second flow of washing water which joins the first flow. The second rim water channel allows the washing water to flow to the second water discharge port. The second rim water channel comprises: a bent part where a flow direction of the washing water is changed to an opposite direction; and a slope part where a bottom surface of the second rim water channel on a downstream side of the bent part inclines downward towards the downstream side.SELECTED DRAWING: Figure 3B

Description

[Technical field]

[0001] The disclosed embodiments relate to a flush toilet. [Background technology]

[0002] Conventionally, in flush toilets equipped with a bowl portion having a bowl-shaped waste receiving surface for receiving waste and a rim portion extending upwards at the upper edge of the waste receiving surface, there is known a type that comprises a first spout that spouts flushing water to form a first swirling flow that swirls over the waste receiving surface, a first rim water conduit through which the flushing water supplied to the first spout flows, a second spout that spouts flushing water to form a second swirling flow that merges with the first swirling flow, and a second rim water conduit through which the flushing water supplied to the second spout flows (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-142100 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional flush toilets as described above, for example, when the force of the flush water discharged from the first water outlet is strong, such as in so-called flush valve toilets that supply primary water pressure to the toilet body, the flush water from the second water outlet is also discharged with strong water force, so the flush water may have difficulty flowing downward in the area below the second water outlet on the waste receiving surface.This can result in the occurrence of residue being left behind in the area below the second water outlet on the waste receiving surface where the flush water has difficulty flowing downward.

[0005] Thus, conventional flush toilets such as those described above have room for improvement in terms of cleaning performance of the waste receiving surface.

[0006] An object of one aspect of the embodiment is to provide a flush toilet that can improve the cleaning performance of the waste receiving surface. [Means for solving the problem]

[0007] A flush toilet according to one aspect of the embodiment comprises a bowl portion having a bowl-shaped waste receiving surface that receives waste and a rim portion extending upward from the upper edge of the waste receiving surface, a trap pipe that communicates with the bottom of the bowl portion and extends from the bottom, and discharges waste received on the waste receiving surface, a first water outlet that spouts flush water towards the rim portion and forms a first flow of flush water that swirls over the waste receiving surface, and a flush water supply that is located upstream of the first water outlet and is supplied to the first water outlet. The flushing water supply system comprises a first rim conduit through which purified water flows, a second outlet which discharges flush water towards the rim section and forms a second flow of flush water which merges with the first flow, and a second rim conduit which is located upstream of the second outlet and through which flush water supplied to the second outlet flows, the second rim conduit having a bent section which reverses the flow direction of the flush water supplied to the second outlet, and a sloping section downstream of the bent section where the bottom surface of the second rim conduit slopes downward towards the downstream side.

[0008] According to this configuration, downstream of the bent portion of the second rim water conduit through which the flush water supplied to the second water outlet flows, the second rim water conduit has a sloped portion where the bottom surface slopes downward toward the downstream side, so that when the flush water flows down the sloped portion, the flush water discharged from the second water outlet has a downward vector that causes it to flow downward. For this reason, even in a flush toilet in which flush water is discharged with great water force from the first water outlet, for example, it is possible to cause the flush water to flow down to the area below the second water outlet. This makes it possible to reduce the occurrence of unwashed areas in the area below the second water outlet on the waste receiving surface, and improve the cleaning performance of the waste receiving surface.

[0009] Furthermore, in the flush toilet described above, the inclined portion is positioned immediately downstream of the bent portion.

[0010] With this configuration, by arranging the inclined portion immediately downstream of the bent portion, the flush water discharged from the second water outlet has a downward vector that causes it to flow further downward. Therefore, even in a flush toilet in which flush water is discharged with great force from the first water outlet, for example, it is possible to cause the flush water to flow down to the area below the second water outlet. This makes it possible to reduce the occurrence of unwashed areas in the area below the second water outlet on the waste receiving surface, and improves the cleaning performance of the waste receiving surface.

[0011] Additionally, in the flush toilet described above, the second rim water channel further has a flat section downstream of the inclined section, the flat section having an inclination angle closer to horizontal than the inclined section.

[0012] With this configuration, the second rim water conduit has a flat section downstream of the inclined section, so that the flush water discharged from the second water outlet has a downward vector that causes it to flow downward, while the flush water can be rectified just before being discharged from the second water outlet. As a result, even in a flush toilet in which flush water is discharged with great force from the first water outlet, for example, it is possible to cause flush water to flow down to the area below the second water outlet, and it is possible to strengthen the cleaning power of the rectified flush water. This makes it possible to reduce the occurrence of unwashed areas in the area below the second water outlet on the waste receiving surface, and improve the cleaning performance of the waste receiving surface.

[0013] Furthermore, in the flush toilet described above, the top surface of the second rim water conduit on the downstream side of the bent portion is lower than the top surface on the upstream side of the bent portion.

[0014] With this configuration, the top surface of the second rim water conduit downstream of the bend is lower than the top surface of the second rim water conduit upstream, so that the flush water flowing through the second rim water conduit has a downward vector due to the top surface as it moves downstream, making the flush water more susceptible to the influence of the shape of the slope, and as the flush water flows down the slope, the flush water discharged from the second water outlet has a downward vector that flows downward. For this reason, for example, even in a flush toilet in which flush water is discharged with great water force from the first water outlet, it is possible to cause the flush water to flow down to the area below the second water outlet. This makes it possible to reduce the occurrence of unwashed areas in the area below the second water outlet on the waste receiving surface, improving the cleaning performance of the waste receiving surface.

[0015] Furthermore, the flush toilet described above further comprises a joint that joins the waste receiving surface and the rim portion and has a concave surface that is curved with a curvature that decreases from the upstream side to the downstream side of the first flow just before the second outlet in the flow direction of the first flow.

[0016] With this configuration, the curvature of the concave surface of the joint that joins the waste receiving surface and the rim portion decreases from the upstream side to the downstream side just before the flow direction of the first flow of the second water outlet, and this shape of the joint makes it possible to increase the downward vector of the flush water swirling on the waste receiving surface by centrifugal force. Therefore, for example, even in a flush toilet in which flush water is discharged with great water force from the first water outlet, it is possible to cause the flush water to flow down to the area below the second water outlet. This makes it possible to reduce the occurrence of unwashed areas in the area below the second water outlet on the waste receiving surface, and improve the cleaning performance of the waste receiving surface. Effect of the Invention

[0017] According to a flush toilet pertaining to one aspect of the embodiment, the cleaning performance of the waste receiving surface can be improved. [Brief description of the drawings]

[0018] [Figure 1]FIG. 1 is a schematic cross-sectional side view showing a flush toilet according to an embodiment. [Figure 2A] FIG. 2A is a cross-sectional view (part 1) taken along line II-II in FIG. [Figure 2B] FIG. 2B is a second cross-sectional view taken along line II-II in FIG. [Figure 3A] FIG. 3A is a schematic cross-sectional view (part 1) taken along line III-III in FIG. 2B. [Figure 3B] FIG. 3B is a schematic cross-sectional view (part 2) taken along line III-III in FIG. 2B. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line VV in FIG. 2B. [Diagram 5] FIG. 5 is an explanatory diagram of the first flow (first swirling flow) and second flow (second swirling flow) of flush water in a flush toilet according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Below, an embodiment of a flush toilet disclosed in the present application will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiment described below.

[0020] <1. Overall structure of the flush toilet> The overall structure of a flush toilet 1 according to an embodiment will be described with reference to Figures 1, 2A, and 2B. Figure 1 is a schematic side cross-sectional view showing a flush toilet according to an embodiment. Figures 2A and 2B are cross-sectional views taken along line II-II in Figure 1. Note that Figure 2A shows the flow (swirling flow) of flush water W12, W22 during toilet flushing. Also, Figure 2B shows the flow of flush water W11, W21 supplied to first and second water outlets 31, 32.

[0021] Each figure also shows a three-dimensional Cartesian coordinate system including the Z axis, with the positive direction being the vertically upward (upward). For ease of explanation, the positive direction of the X axis is defined as the left, the negative direction of the X axis as the right, the positive direction of the Y axis as the forward direction, and the negative direction of the Y axis as the backward direction, and the X axis direction is defined as the left-right direction, the Y axis direction as the front-back direction, and the Z axis direction as the up-down direction.

[0022] As shown in Figure 1, the flush toilet 1 is a so-called wall-hung type that is installed on the wall surface WS of the toilet room TR. However, the flush toilet 1 may also be a so-called floor-standing type that is installed on the floor surface FS of the toilet room TR.

[0023] Furthermore, the flush toilet 1 is a so-called flush valve toilet, which supplies flush water to the toilet body 20, described below, using primary water pressure from a water supply source such as a water main. Note that the flush toilet 1 may also be one that supplies flush water to the toilet body 20 from a water storage tank, which serves as a water supply source, attached to the back side of the wall WS, for example. A drain pipe (not shown) for discharging waste is also provided on the back side of the wall WS. The drain pipe is connected to a trap pipe 22, described below, of the toilet body 20, for example, via a drain socket (not shown) or the like.

[0024] Furthermore, the flush toilet 1 (toilet body 20) is made of ceramic. However, the flush toilet 1 is not limited to being made of ceramic, and may be made of resin, or may be made from a combination of ceramic and resin.

[0025] Although not shown, a toilet seat (or a toilet seat device with a private parts cleansing function) and a toilet lid are attached to the top of the toilet body 20 of the flush toilet 1.

[0026] As shown in Figures 1, 2A, and 2B, the flush toilet 1 comprises a toilet body 20. The toilet body 20 comprises a bowl section 21, a trap pipe 22, a skirt section 23, and a back surface 24. The flush toilet 1 also comprises multiple water outlets (first water outlet 31, second water outlet 32). The flush toilet 1 also comprises a main water passage 40, a first rim water passage 41, and a second rim water passage 42.

[0027] The bowl portion 21 includes a waste receiving surface 211, a rim portion 222, and a joint portion 223. The waste receiving surface 211 is a portion that receives waste, and is formed in a bowl shape (concave shape). The rim portion 222 is provided so as to extend upward at the upper edge portion of the waste receiving surface 211. The rim portion 222 is formed in an annular shape along the upper edge portion of the waste receiving surface 211.

[0028] The joint 213 joins the waste receiving surface 211 and the rim portion 212. The joint 213 has a concave surface 213a (described later) on its upper surface (front surface) so as to smoothly connect the waste receiving surface 211 and the rim portion 212. The joint 213 will be described later with reference to FIG. 5 etc.

[0029] A predetermined amount of water W is stored in the bottom of the bowl portion 21 (the waste receiving surface 211). T In addition, a trap pipe 22 is connected to the bottom of the bowl portion 21.

[0030] The trap pipe 22 is connected to the bottom of the bowl portion 21. The trap pipe 22 is a pipe that extends rearward from the bottom of the bowl portion 21. The trap pipe 22 discharges waste received on the waste receiving surface 211 of the bowl portion 21 to a drain pipe, which is an external pipe. The trap pipe 22 also prevents accumulated water W formed at the bottom of the bowl portion 21 from flowing through the top of a rising portion 221 that is inclined so as to rise toward the rear. T This specifies the water level.

[0031] The skirt portion 23 is provided so as to cover from one of the left or right side portions of the bowl portion 21, passing through the front portion, to the other left or right side portion. The skirt portion 23 constitutes the external appearance of the flush toilet 1.

[0032] The back surface 24 is provided behind the bowl portion 21. The back surface 24 is fixed to the wall surface WS of the toilet room TR, for example, by attaching a mounting fixture (not shown) to a mounting hole (not shown). By fixing the back surface 24 to the wall surface WS in this way, the flush toilet 1 is fixed to the wall surface WS.

[0033] As shown in Figures 2A and 2B, the flush toilet 1 is equipped with multiple water outlets that spout flush water W into the bowl portion 21 (waste receiving surface 211) in order to clean the bowl portion 21. The flush toilet 1 is equipped with a first water outlet 31 and a second water outlet 32. The first water outlet 31 is positioned at the rear of the bowl portion 21, and spouts flush water W toward the rim portion 212. The first water outlet 31 spouts flush water W12 from the rear of the waste receiving surface 211, either to the left or right (for example, the right).

[0034] The first water discharge port 31 forms a first flow (first swirling flow) of flush water W12 that swirls on the waste receiving surface 211. That is, the flush water W discharged from the first water discharge port 31 becomes a first swirling flow (flush water W12) that swirls on the waste receiving surface 211 and the joint 213 by centrifugal force.

[0035] The second water outlet 32 ​​is disposed at the rear of the bowl portion 21, and spouts flush water W toward the rim portion 212. The second water outlet 32 ​​spouts flush water W22 from the rear of the other of the left and right sides (for example, the left side) of the waste receiving surface 211.

[0036] The second water discharge port 32 merges with the first swirling flow (flush water W12) and forms a second flow (second swirling flow) of flush water W22 that swirls together with the first swirling flow (flush water W12) on the waste receiving surface 211. That is, the flush water W22 discharged from the second water discharge port 32 becomes a second swirling flow (flush water W22) that swirls on the waste receiving surface 211 and the joint 213 by centrifugal force, similar to the first swirling flow (flush water W12). Note that the first swirling flow (flush water W12) and the second swirling flow (flush water W22) may swirl including a portion on the rim portion 212.

[0037] In this way, the flush water W (W12, W22) discharged from the first water outlet 31 and the second water outlet 32 ​​becomes a first swirling flow (flush water W12) and a second swirling flow (flush water W22) that respectively swirl and flow into the trap pipe 22. In the flush toilet 1, the waste receiving surface 211 is cleaned (tornado flushing) by this first swirling flow (flush water W12) and second swirling flow (flush water W22).

[0038] As shown in Figure 2B, the flush toilet 1 is equipped with a main conduit 40, a first rim conduit 41, and a second rim conduit 42. The main conduit 40 extends forward from a supply port 43 for flush water W in the flush toilet 1. Flush water W flows in the main conduit 40 to be supplied to the bowl section 21. The flush water W flowing through the main conduit 40 branches into left and right directions on the downstream side, with one branch being supplied to the first rim conduit 41, described below, and the other being supplied to the second rim conduit 42, described below.

[0039] The first rim conduit 41 is disposed upstream of the first outlet 31. Flush water W11 branching off from the main conduit 40 flows through the first rim conduit 41. The first outlet 31 is formed at the downstream end of the first rim conduit 41. That is, the flush water W11 to be supplied to the first outlet 31 flows through the first rim conduit 41.

[0040] The second rim conduit 42 is disposed upstream of the second outlet 32. Flush water W21 branching off from the main conduit 40 flows through the second rim conduit 42. The second outlet 32 ​​is formed at the downstream end of the second rim conduit 42. That is, the flush water W21 to be supplied to the second outlet 32 ​​flows through the second rim conduit 42.

[0041] The second rim conduit 42 includes an upstream conduit 421, a downstream conduit 422, and a bent portion 423. The upstream conduit 421 extends leftward so that the flush water W21 branching off from the main conduit 40 flows leftward, for example. The downstream conduit 422 extends in the opposite direction (for example, rightward) to the direction in which the upstream conduit 421 extends. A second water outlet 32 ​​is formed at the downstream end of the downstream conduit 422.

[0042] The bent portion 423 is provided at the downstream end of the upstream headrace 421 and the upstream end of the downstream headrace 422 so as to join the upstream headrace 421 and the downstream headrace 422. Such a bent portion 423 changes the flow direction of the flush water W21 supplied to the second outlet 32 ​​in the second rim headrace 42 to the opposite direction.

[0043] Here, in the case of a toilet with a flush valve, in which the force of the flush water W discharged from the first water outlet 31 is strong, the flush water W12 swirling in the bowl portion 21 by centrifugal force maintains its swirling force even in the rear area A2 of the bowl portion 21 (the waste receiving surface 211), so the flush water W may have difficulty flowing downward in the rear area A2 of the waste receiving surface 211. For this reason, there is a possibility that some parts will not be washed properly in the area below the second water outlet 32 ​​on the waste receiving surface 211, where the flush water W12 has difficulty flowing downward, i.e., in the rear area A2 of the waste receiving surface 211.

[0044] If the bottom surface 422b of the downstream water conduit 422 of the second rim water conduit 42 is flat, the flush water W22 will be discharged from the second water outlet 32 ​​substantially horizontally, and it is considered that the flush water W22 will not easily flow into the area below the second water outlet 32 ​​(the rear area A2 of the waste receiving surface). For this reason, in this embodiment, the bottom surface 422b of the downstream water conduit 422 of the second rim water conduit 42 has an inclined portion 422b1 that slopes downward toward the downstream side, thereby forming a downward flow of the flush water W22 toward the area below the second water outlet 32 ​​(the rear area A2 of the waste receiving surface).

[0045] <2. Second rim waterway> Next, the second rim water conduit 42 will be described with reference to Figures 3A, 3B, and 4. Figures 3A and 3B are schematic cross-sectional views taken along line III-III in Figure 2B. Figure 3A shows a schematic perspective view (cross-section) of the downstream water conduit 422 of the second rim water conduit 42. Figure 3B shows a schematic front cross-section of the downstream water conduit 422 of the second rim water conduit 42. Figure 4 is a schematic cross-sectional view taken along line VV in Figure 2B. Figure 4 shows schematic side cross-sections of the upstream water conduit 421 and downstream water conduit 422 of the second rim water conduit 42.

[0046] As described above, the second rim water conduit 42 includes the upstream water conduit 421, the downstream water conduit 422, and the bent portion 423. The upstream water conduit 421 and the downstream water conduit 422 are partitioned in the front-rear direction by a partition wall 424.

[0047] 3A and 3B, the downstream water conduit 422 has a top surface 422a and a bottom surface 422b. The length (height) of the downstream water conduit 422 in the up-down direction is determined by the top surface 422a and the bottom surface 422b.

[0048] As shown in FIG. 3B, bottom surface 422b includes inclined portion 422b1 and flat portion 422b2. Inclined portion 422b1 is an inclined surface formed by bottom surface 422b sloping downward toward the downstream side. Therefore, bottom surface 422b is formed so as to widen toward the downstream side by inclined portion 422b1. In addition, inclined portion 422b1 is disposed downstream of bent portion 423. Inclined portion 422b1 is preferably disposed immediately after bent portion 423 on the downstream side.

[0049] Such an inclined portion 422b1 acts on the flush water W21 flowing in the downstream water conduit 422 so as to have a downward vector such that the flush water W12 flows downward.

[0050] The flat portion 422b2 is a surface (flat surface) formed when the bottom surface 422b is substantially flat. The flat portion 422b2 is a surface whose inclination angle is closer to horizontal than the inclined portion 422b1. The flat portion 422b2 is disposed downstream of the inclined portion 422b1. The flat portion 422b2 is preferably disposed immediately after the downstream side of the inclined portion 422b1.

[0051] Such flat portion 422b2 acts to straighten the flow of flush water W12 relative to flush water W21 flowing through the downstream headrace 422.

[0052] 4, the top surface 422a of the downstream water conduit 422 is formed to be lower in height than the top surface 421a of the upstream water conduit 421, which is located upstream of the downstream water conduit 422 across the bent portion 423. In this way, because the top surface 422a of the downstream water conduit 422 is lower than the top surface 421a of the upstream water conduit 421, the flush water W21 flowing through the second rim water conduit 42 has a downward vector as it moves downstream.

[0053] 4, the bottom surface 422b of the downstream water conduit 422 is formed to be lower in height than the bottom surface 421b of the upstream water conduit 421. Because the bottom surface 422b of the downstream water conduit 422 is lower than the bottom surface 421b of the upstream water conduit 421, the flush water W21 flowing through the second rim water conduit 42 has a downward vector as it moves downstream.

[0054] As shown in FIG. 3B, in the second rim water conduit 42, the flush water W21 flowing through the downstream water conduit 422 has a downward vector as it moves downstream, and the flush water W22 discharged from the second water outlet 32 ​​formed at the downstream end of the downstream water conduit 422 comes to include a downward flow (flush water W221).

[0055] <3. Aspects of the second flow (second swirling flow)> Next, the aspect of the second flow (second swirling flow) of flush water W22 (W221) will be explained with reference to Figure 5. Figure 5 is an explanatory diagram of the first flow (first swirling flow) and second flow (second swirling flow) of flush water W in a flush toilet 1 according to an embodiment.

[0056] By having the second rim water conduit 42 (downstream water conduit 422) have an inclined portion 422b1 (see FIG. 3B) and the like, the flush water W221 spouted from the second water outlet 32 ​​has a downward vector that causes it to flow downward.

[0057] 5, the flush water W221 flows into the area below the second water outlet 32, i.e., into the rear area A2 of the waste receiving surface 211. The flush water W221 that flows into the rear area A2 of the waste receiving surface 211 cleans the rear area A2 of the waste receiving surface 211.

[0058] Moreover, as shown in FIG. 5, it is preferable that the first flow (first swirling flow) of flush water W12 discharged from the first water discharge port 31 (see FIGS. 2A and 2B) also flows toward the rear area A2 of the waste receiving surface 211.

[0059] <4. Concave surface of joint> Here, the concave surface 213a of the joint 213 for forming a flow such that the flush water W12 discharged from the first water discharge port 31 flows toward the rear area A2 of the waste receiving surface 211 will be described.

[0060] The joint 213 that joins the waste receiving surface 211 and the rim portion 212 has a concave surface 213a on its upper surface (front surface) that curves downward at a predetermined curvature. The concave surface 213a of the joint 213 is curved at a curvature that decreases from the upstream side to the downstream side just before the flow direction of the flush water W12 in the first swirling flow of the second water outlet 32 ​​(see FIGS. 2A and 2B).

[0061] Also, concave surface 213a of joint 213 is formed so that its vertical length gradually increases from the upstream side to the downstream side in the flow direction of flush water W12 in the first swirling flow. In other words, the proportion of concave surface 213a of joint 213 in the vertical direction of bowl portion 21 (see FIGS. 2A and 2B) increases from the upstream side to the downstream side in the flow direction of flush water W12 in the first swirling flow.

[0062] Furthermore, the joint portion 213 is formed so that the starting point in the flow direction of the first swirling flow of the wash water W12, where the curvature of the concave surface 213a begins to become smaller, is located rearward of the center of the bowl portion 21 in the front-rear direction.

[0063] <5. Aspects of the first flow (first swirl flow)> Since the curvature of the concave surface 213a of the junction 213 becomes smaller from the upstream side to the downstream side just before the flow direction of the first swirling flow (cleaning water W12) (see Figure 2A) of the second water outlet 32, the downward vector of the cleansing water W12 discharged from the first water outlet 31 (see Figure 2A) becomes larger at the concave surface 213a of the junction 213 located just before the second water outlet 32.

[0064] 5, the first swirling flow (flush water W12) includes a downward flow (flush water W121) immediately before the second water outlet 32. Such flush water W121 then flows toward the rear area A2 of the waste receiving surface 211, washing the rear area A2 of the waste receiving surface 211.

[0065] According to the flush toilet 1 of the embodiment described above, the bottom surface 422b of the second rim water conduit 42 (downstream water conduit 422) has an inclined section 422b1 that slopes downward toward the downstream side downstream of the bent section 423 of the second rim water conduit 42 through which the flush water W21 supplied to the second water outlet 32 ​​flows, so that when the flush water W21 flows down the inclined section 422b1, the flush water W221 discharged from the second water outlet 32 ​​has a downward vector that causes it to flow downward. For this reason, even in a flush toilet 1 in which the flush water W12 is discharged with great water force from the first water outlet 31, such as a flush valve toilet, it is possible to cause the flush water W221 to flow downward into the area below the second water outlet 32 ​​(the rear area A2 of the waste receiving surface 211). This makes it possible to prevent the occurrence of areas left unwashed in the rear area A2 of the waste receiving surface 211, and improves the cleaning performance of the waste receiving surface 211.

[0066] Furthermore, by positioning the inclined portion 422b1 immediately after the downstream side of the bent portion 423, the flush water W221 spouted from the second water outlet 32 ​​has a downward vector that causes it to flow further downward. For this reason, even in a flush toilet 1 in which flush water W12 is spouted with great water force from the first water outlet 31, such as a flush valve toilet, it is possible to cause the flush water W221 to flow downward into the area below the second water outlet 32 ​​(the rear area A2 of the waste receiving surface 211). This makes it possible to prevent the occurrence of unwashed areas in the rear area A2 of the waste receiving surface 211, and improves the cleaning performance of the waste receiving surface 211.

[0067] Furthermore, by having the second rim water conduit 42 (downstream water conduit 422) have a flat section 422b2 downstream of the inclined section 422b1, the flush water W221 discharged from the second water outlet 32 ​​can be configured to have a downward vector so that it flows downward, while rectifying the flush water W21 immediately before it is discharged from the second water outlet 32. For this reason, even in a flush toilet 1 in which flush water W12 is discharged with great water force from the first water outlet 31, such as a flush valve toilet, it is possible to cause the flush water W221 to flow downward into the area below the second water outlet 32 ​​(the rear area A2 of the waste receiving surface 211), and it is possible to strengthen the cleaning power of the rectified flush water W221. This makes it possible to prevent the occurrence of unwashed areas in the rear area A2 of the waste receiving surface 211, and improve the cleaning performance of the waste receiving surface 211.

[0068] Furthermore, because the top surface 422a of the downstream water conduit 422 is lower than the top surface 421a of the upstream water conduit 421, the flush water W21 flowing in the second rim water conduit 42 has a downward vector due to the top surface 422a as it moves downstream, and the flush water W21 is more susceptible to the shape of the inclined portion 422b1, and when the flush water W21 flows over the inclined portion 422b1, the flush water W221 discharged from the second water outlet 32 ​​has a downward vector that flows downward. For this reason, even in a flush toilet 1 in which flush water W12 is discharged with great water force from the first water outlet 31, such as a flush valve toilet, it is possible to cause the flush water W221 to flow down to the area below the second water outlet 32 ​​(the rear area A2 of the waste receiving surface 211). This makes it possible to prevent the occurrence of unwashed areas in the rear area A2 of the waste receiving surface 211, and improve the cleaning performance of the waste receiving surface 211.

[0069] Also, because the curvature of the concave surface 213a of the joint 213 decreases from the upstream side to the downstream side just before the flow direction of the first swirling flow (flush water W12) of the second water outlet 32, this shape of the joint 213 makes it possible to increase the downward vector of the flush water W121 swirling over the waste receiving surface 211 by centrifugal force, and to spread the concentrated flow of flush water W121 in a fan shape toward the rear of the waste receiving surface 211. For this reason, even in a flush toilet 1 in which flush water W12 is discharged with great water force from the first water outlet 31, such as a flush valve toilet, it is possible to flush a wide area of ​​the rear of the bowl section 21 (the rear of the waste receiving surface 211) while causing the flush water W121 to flow down into the area below the second water outlet 32 ​​(the rear area A2 of the waste receiving surface 211). This makes it possible to prevent the occurrence of areas left unwashed in the rear area A2 of the waste receiving surface 211, and improves the cleaning performance of the waste receiving surface 211.

[0070] Furthermore, by increasing the proportion of the joint 213 in the up-down direction from the upstream side to the downstream side in the flow direction of the first swirling flow (flush water W12), it is possible to make the downward vector larger for the flush water W12 (W121) swirling above the waste receiving surface 211 by centrifugal force. For this reason, even in a flush toilet 1 in which flush water W12 is discharged with great water force from the first water outlet 31, such as a flush valve toilet, it is possible to cause the flush water to flow downward from the top to the bottom of the waste receiving surface 211. This makes it possible to prevent the occurrence of unwashed areas on the waste receiving surface 211, and improves the cleaning performance of the waste receiving surface 211.

[0071] Also, by positioning the starting point where the curvature of the concave surface 213a of the joint 213 becomes smaller rearward from the center in the front-to-rear direction of the bowl portion 21, the force of the flush water W12 is not reduced in the front region A1 (see FIG. 2A) of the bowl portion 21 (waste receiving surface 211), while the flush water W12 (W121) can be made to flow down in the rear region A2 of the bowl portion 21 (waste receiving surface 211). For this reason, even in a flush toilet 1 in which flush water W12 is discharged with great force from the first water outlet 31, such as a flush valve toilet, it is possible to cause the flush water W12 (W121) to flow down from the top to the bottom of the waste receiving surface 211. This makes it possible to prevent the occurrence of unwashed areas on the waste receiving surface 211, and improve the cleaning performance of the waste receiving surface 211.

[0072] In addition, by positioning the starting point where the curvature of concave surface 213a of joint 213 becomes smaller rearward from the center in the front-to-rear direction of bowl portion 21, flush water 121 can be made to flow downward without spreading too far downward. This makes it possible to prevent the upper end of waste receiving surface 211 from being left unwashed.

[0073] In the above embodiment, the curvature of the concave surface 213a of the joint 213 is configured to become smaller from the upstream side to the downstream side just before the second water outlet 32 ​​in the flow direction of the first swirling flow (cleaning water W12), but it may also be configured to become smaller from the upstream side to the downstream side just before the first water outlet 31 in the flow direction of the first swirling flow (cleaning water W12).

[0074] In addition, in the above-described embodiment, the bowl portion 21 is cleaned by spraying cleaning water W12, W22 from two water outlets, the first water outlet 31 and the second water outlet 32, but the bowl portion 21 may be cleaned by spraying cleaning water W from three or more water outlets including the first water outlet 31 and the second water outlet 32.

[0075] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0076] 1 flush toilet 21 Bowl section 22 Trap pipe 31 First outlet 32 Second outlet 41 First Rim Waterway 42 Second Rim Waterway 211 Waste receiving surface 212 Rim section 213 Joint 213a concave 421a Top 422a Top 422b Bottom 422b1 Slope 422b2 Flat part 423 Bend W12 Cleaning water W22 Cleaning water

Claims

1. a bowl portion having a bowl-shaped waste receiving surface for receiving waste and a rim portion extending upward from an upper edge of the waste receiving surface; a trap pipe communicating with a bottom of the bowl portion and extending from the bottom, for discharging waste received on the waste receiving surface; a first water outlet that discharges flush water toward the rim portion and forms a first flow of flush water that swirls on the waste receiving surface; A first rim water channel is located upstream of the first water outlet and through which flush water supplied to the first water outlet flows; A second water outlet that discharges flush water toward the rim portion and forms a second flow of flush water that merges with the first flow; a second rim water conduit located upstream of the second water outlet, through which flush water supplied to the second water outlet flows; Equipped with The second rim water conduit has a bent portion that changes the flow direction of the flush water supplied to the second water outlet in the opposite direction, and a slope portion in which the bottom surface of the second rim water conduit slopes downward toward the downstream side downstream of the bent portion, The height of the second rim water conduit is greater near the second outlet than at the bent portion. A flush toilet characterized by:

2. The inclined portion is disposed immediately downstream of the bent portion.

2. The flush toilet according to claim 1.

3. The second rim water channel further has a flat portion downstream of the inclined portion, the flat portion having an inclination angle closer to horizontal than the inclined portion.

3. The flush toilet according to claim 2.

4. The second rim water conduit has a top surface downstream of the bent portion that is lower than a top surface upstream of the bent portion.

4. The flush toilet according to claim 3.

5. a joint portion that joins the waste receiving surface and the rim portion and has a concave surface that is curved with a curvature that decreases from the upstream side to the downstream side of the first flow just before the second water outlet in the flow direction of the first flow; Further equipped A flush toilet according to any one of claims 1 to 4.

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