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 second water discharge port, and a junction part. 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 communicates with a bottom part of the bowl part and extends from the bottom part to discharge the excretion received on the excretion-receiving surface. The first water discharge port discharges washing water towards the rim part and forms a first flow of washing water which revolves on the excretion-receiving surface. The second water discharge port discharges washing water towards the rim and forms a second flow of the washing water which joins the first flow. The junction part joints the excretion-receiving surface and the rim part, and comprises a concave surface curved immediately before a first direction of the first flow of the first water discharge port or the second water discharge port, at a curvature gradually decreasing as proceeding from an upstream side toward a downstream side of the first flow.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Conventionally, flush toilets equipped with a bowl portion having a bowl-shaped waste receiving surface for receiving waste and a rim portion extending upward from the upper edge of the waste receiving surface, and equipped with multiple water outlets for discharging flush water, are known. Such multiple water outlets include, for example, a first water outlet that discharges flush water to form a first swirling flow that swirls over the waste receiving surface, and a second water outlet that discharges flush water to form a second swirling flow that merges with the first swirling flow (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-8790 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional flush toilets such as those described above, for example in so-called flush valve toilets that supply primary water pressure to the toilet body and have a strong water force when flush water is discharged from the first water outlet, the flush water swirling on the waste receiving surface by centrifugal force maintains its swirling force even in the rear area of ​​the waste receiving surface, so the flush water may have difficulty flowing downward in the rear area of ​​the waste receiving surface.This can result in some residue being left behind in the rear area of ​​the waste receiving surface where 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 embodiment comprises a bowl portion having a bowl-shaped waste receiving surface for receiving waste and a rim portion extending upward from the upper edge of the waste receiving surface, a trap pipe communicating with and extending from the bottom of the bowl portion for discharging waste received on the waste receiving surface, a first spout which spouts flushing water toward the rim portion and forms a first flow of flushing water that swirls over the waste receiving surface, a second spout which spouts flushing water toward the rim portion and forms a second flow of flushing water that merges with the first flow, and a joint which 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 first spout or the second spout in the flow direction of the first flow.

[0008] 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 first flow direction of the first water outlet or 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 make the flush water flow down from the top to the bottom on the waste receiving surface. This makes it possible to reduce the occurrence of unwashed areas on the waste receiving surface and improve the cleaning performance of the waste receiving surface.

[0009] Furthermore, in the flush toilet described above, the proportion of the joint in the up-down direction increases from the upstream side to the downstream side of the first flow.

[0010] With this configuration, the proportion of the joint in the vertical direction increases from the upstream side to the downstream side of the first flow, making it possible to increase the downward vector of the flush water swirling above the waste receiving surface due to centrifugal force. As a result, even in a flush toilet in which flush water is discharged with great force from the first spout, for example, it is possible to make the flush water flow down from the top to the bottom of the waste receiving surface. This makes it possible to reduce the occurrence of areas left unwashed on the waste receiving surface, and improve the cleaning performance of the waste receiving surface.

[0011] Furthermore, in the above-mentioned flush toilet, the second water outlet is positioned at the rear of the bowl portion, and the joint 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.

[0012] 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 spout, and this shape of the joint can increase the downward vector of the flush water swirling on the waste receiving surface by centrifugal force, and can spread the concentrated flow of flush water in a fan shape toward the rear of the waste receiving surface. Therefore, even in a flush toilet in which flush water is spouted with great water force from the first spout, for example, it is possible to flush a wide area of ​​the rear of the bowl portion (the rear of the waste receiving surface) while causing the flush water to flow down from the top to the bottom of the waste receiving surface. This can reduce the occurrence of areas left unwashed on the waste receiving surface, and improve the cleaning performance of the waste receiving surface.

[0013] Also, in the flush toilet described above, the joint has a starting point in the flow direction where the curvature of the concave surface becomes smaller, located rearward of the center of the bowl portion in the front-to-rear direction.

[0014] According to this configuration, the curvature of the concave surface of the joint that joins the waste receiving surface and the rim portion becomes smaller from the upstream side to the downstream side just before the flow direction of the first flow of the second water outlet, and further, the starting point where the curvature of the concave surface of the joint becomes smaller is located behind the center of the front-to-rear direction of the bowl portion, so that the downward vector of the flush water swirling on the waste receiving surface by centrifugal force can be made larger. Also, the force of the flush water is not reduced in the front region of the bowl portion (waste receiving surface), while the flush water can be made to flow down in the rear region of the bowl portion (waste receiving surface). Therefore, for example, even in a flush toilet in which flush water is discharged from the first water outlet with a large force, it is possible to make the flush water flow down from the top to the bottom of the waste receiving surface. This makes it possible to prevent the occurrence of unwashed areas on the waste receiving surface, and improve the cleaning performance of the waste receiving surface.

[0015] Furthermore, in the flush toilet described above, the joint, on the downstream side of the starting point, occupies more than half of the distance from the bottom end of the joint to the top end of the rim portion.

[0016] According to this configuration, the joint occupies more than half of the distance from the bottom end of the joint to the top end of the rim downstream of the starting point where the curvature of the concave surface becomes smaller, so that the downward vector of the flush water swirling on the waste receiving surface by centrifugal force can be made larger. Also, the force of the flush water is not reduced in the front region of the bowl portion (waste receiving surface), while the flush water can be made to flow downward in the rear region of the bowl portion (waste receiving surface). Therefore, for example, even in a flush toilet in which flush water is discharged from the first spout with a large force, it is possible to make the flush water flow downward from the top to the bottom of the waste receiving surface. This makes it possible to prevent the occurrence of unwashed areas 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 pertaining to the first 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. [Diagram 3] 3A to 3C are schematic cross-sectional views taken along lines IIIa-IIIa, IIIb-IIIb, and IIIc-IIIc in FIG. 2B. [Figure 4] FIG. 4 is an explanatory diagram of the first flow (first swirling flow) of flush water in the flush toilet according to the first embodiment. [Diagram 5] FIG. 5 is an explanatory diagram of a flush toilet pertaining to the second 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. First embodiment> <1-1. Overall structure of a flush toilet> The overall structure of a flush toilet 1 pertaining to the first 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 pertaining to the first 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 details of the joint 213 will be described later with reference to FIG. 3 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, such as one 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 of the flush water W will not be washed away in the rear area A2 of the waste receiving surface 211, where the flush water W12 has difficulty flowing downward.

[0044] If the concave surface 213a (see FIG. 3) of the joint 213 joining the waste receiving surface 211 and the rim portion 212 has a constant curvature from the upstream side to the downstream side in the flow direction of the flush water W12, it is considered that the flush water W12 will not easily flow downward in the rear area A2 of the waste receiving surface 211. For this reason, in this embodiment, the curvature of the concave surface 213a of the joint 213 is made smaller from the upstream side to the downstream side in the flow direction of the flush water W12, forming a downward flow of the flush water W12 in the rear area A2 of the waste receiving surface 211.

[0045] <1-2. Concave surface of joint> Next, the concave surface 213a of the joint 213 will be described with reference to Fig. 3. Fig. 3 is a schematic cross-sectional view taken along line IIIa-IIIa, line IIIb-IIIb, and line IIIc-IIIc in Fig. 2B. In Fig. 3, (a) shows a schematic cross-sectional view taken along line IIIa-IIIa, (b) shows a schematic cross-sectional view taken along line IIIb-IIIb, and (c) shows a schematic cross-sectional view taken along line IIIc-IIIc.

[0046] In addition, in FIG. 3, the cross-sections along lines IIIa-IIIa, IIIb-IIIb, and IIIc-IIIc are cross-sections orthogonal to the flow direction of the washing water W12, respectively. That is, in FIG. 3, (a) shows an upstream cross-section in the flow direction of the washing water W12, (b) shows a cross-section downstream of (a), and (c) shows a cross-section downstream of (b). Also, in FIG. 3, the joint portion 213 (concave surface 213a) is indicated by a thick line portion.

[0047] As shown in FIG. 3, the joint portion 213 that joins the dirt receiving surface 211 and the rim portion 212 has a concave surface 213a that curves downward with a predetermined curvature on the upper surface (surface). Also, the concave surface 213a of the joint portion 213 curves with a curvature that decreases from the upstream side to the downstream side immediately before the flow direction of the washing water W12 in the first swirling flow of the second water discharge port 32 (see FIGS. 2A and 2B).

[0048] Also, as shown in FIG. 3, the concave surface 213a of the joint portion 213 is formed such that the vertical length H1 gradually increases from the upstream side to the downstream side in the flow direction of the washing water W12 in the first swirling flow. That is, the vertical length H1 has a relationship of "H1a < H1b < H1c". In other words, the proportion of the concave surface 213a of the joint portion 213 in the vertical direction of the bowl portion 21 (see FIGS. 2A and 2B) increases from the upstream side to the downstream side in the flow direction of the washing water W12 in the first swirling flow.

[0049] Returning to FIG. 2B, the joint portion 213 is formed such that the starting point P in the flow direction of the washing water W12 of the first swirling flow, where the curvature of the concave surface 213a begins to decrease, is located behind the center (center line L) in the front-rear direction of the bowl portion 21.

[0050] <1-3. Mode of the First Flow (First Swirling Flow)> Next, the mode of the first flow (first swirling flow) of the washing water W12 (W121) will be described with reference to FIG. 4. FIG. 4 is an explanatory diagram of the first flow (first swirling flow) of the washing water W12 (W121) in the flushing toilet 1 according to the first embodiment.

[0051] As described above, the curvature of the concave surface 213a of the junction 213 becomes smaller from the upstream side to the downstream side in the flow direction of the first swirling flow (cleaning water W12) (see Figure 2A) of the second water outlet 32, so that 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 immediately before the second water outlet 32.

[0052] 4, 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.

[0053] According to the flush toilet 1 of the first embodiment as described above, the curvature of the concave surface 213a of the joint 213 decreases from the upstream side to the downstream side immediately before the flow direction of the first swirling flow (flush water W12) of the second water outlet 32, so that the downward vector can be increased with respect to the flush water W12 (W121) swirling on the waste receiving surface 211 by centrifugal force, and the concentrated flow of flush water W121 can be spread 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 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.

[0054] 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.

[0055] In addition, the curvature of the concave surface 213a of the joint 213 becomes smaller from the upstream side to the downstream side just before the flow direction of the first swirling flow (cleaning water W12) of the second water outlet 32, and further, the starting point P where the curvature of the concave surface 213a of the joint 213 becomes smaller is located behind the center (center line L) in the front-to-rear direction of the bowl portion 21, so that the downward vector of the cleaning water W12 (W121) swirling over the waste receiving surface 211 due to centrifugal force can be made larger.

[0056] Furthermore, by positioning the starting point P where the curvature of the concave surface 213a of the joint 213 becomes smaller behind the center (center line L) in the front-to-rear direction of the bowl portion 21, the flush water 121 can be made to flow downward without spreading too far downward. This makes it possible to prevent the upper end of the waste receiving surface 211 from being left unwashed.

[0057] Also, the force of the flush water W12 is not reduced in the front area 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 area A2 (see FIG. 2A) 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 areas left unwashed on the waste receiving surface 211, and improves the cleaning performance of the waste receiving surface 211.

[0058] <2. Second embodiment> Next, we will explain the flush toilet 10 pertaining to the second embodiment with reference to Figure 5. Figure 5 is an explanatory diagram of the flush toilet 10 pertaining to the second embodiment. Note that Figure 5 shows a partially enlarged perspective view of the flush toilet 10 pertaining to the second embodiment.

[0059] Furthermore, the flush toilet 10 pertaining to the second embodiment differs from the flush toilet 1 pertaining to the first embodiment in the vertical length ratio of the rim section 212 and joint section 213. For this reason, in the following explanation, explanations of parts that are equivalent or identical to those in the first embodiment will be omitted.

[0060] As shown in Figure 5, in the flush toilet 10, the vertical length H1 of the joint 213 accounts for more than half of the distance (vertical length H2) from the bottom end of the joint 213 to the top end of the rim portion 212, downstream of the starting point P (see Figure 2B) in the flow direction of the flush water W12 of the first swirling flow, where the curvature of the concave surface 213a becomes smaller.

[0061] With this flush toilet 10 according to the second embodiment, the length H2 of the joint 213 accounts for more than half of the distance (length H2) from the bottom end of the joint 213 to the top end of the rim section 212 downstream of the starting point P where the curvature of the concave surface 213a becomes smaller, making it possible to increase the downward vector of the flush water W12 swirling above the waste receiving surface 211 due to centrifugal force. Also, the force of the flush water W12 is not reduced in the front region A1 of the bowl section 21 (waste receiving surface 211), while the flush water W12 (W121) can be made to flow downward in the rear region A2 of the bowl section 21 (waste receiving surface 211). For this reason, even in a flush toilet 1 in which the flush water W12 is discharged with great force from the first water outlet 31, such as a flush valve toilet, it is possible to make the flush water W121 flow downward from the top to the bottom of the waste receiving surface 211. This makes it possible to prevent the occurrence of areas of the waste receiving surface 211 that are not washed, and improves the cleaning performance of the waste receiving surface 211.

[0062] 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).

[0063] 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.

[0064] 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]

[0065] 1 flush toilet 21 Bowl section 22 Trap pipe 31 First outlet 32 Second outlet 211 Waste receiving surface 212 Rim section 213 Joint 213a concave L center (center line) P Start point 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 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 joint portion that joins the waste receiving surface and the rim portion, and has a concave surface that is curved with a curvature that gradually decreases from the upstream side to the downstream side of the first flow just before the first water outlet or the second water outlet in the flow direction of the first flow; Equipped A flush toilet characterized by:

2. The proportion of the joint in the up-down direction increases from the upstream side to the downstream side of the first flow.

2. The flush toilet according to claim 1.

3. The second water outlet is disposed at the rear of the bowl portion, The joint portion 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.

3. The flush toilet according to claim 1 or 2.

4. The joint portion has a start point in the flow direction where the curvature of the concave surface becomes smaller, the start point being located rearward of the center of the bowl portion in the front-rear direction.

4. The flush toilet according to claim 3.

5. The joint portion occupies more than half of the distance from the lowermost end of the joint portion to the uppermost end of the rim portion downstream of the starting point.

5. The flush toilet according to claim 4.

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