Flush toilet bowl
Patent Information
- Application Number
- JP2024184697
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2026-03-06
AI Technical Summary
Conventional flush toilets with large water collecting surfaces experience water splashing and water transfer issues when increasing the amount of flushing water to ensure effective waste discharge, leading to insufficient removal of floating waste.
A flush toilet design with a second rim spout that includes an enlarged portion above the spout to manage air pressure, an inclined upper surface to guide water flow, and specific angle configurations to suppress splashing and enhance water distribution into the reservoir surface.
The design effectively suppresses water splashing and transfer while ensuring efficient waste discharge by maintaining a consistent water pressure and directing water flow into the reservoir surface, even with increased water usage.
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Abstract
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, flush toilets have been known which have a bowl portion including a waste receiving surface, a rim portion formed on the upper part of the waste receiving surface, and a pot portion formed on the lower part of the waste receiving surface within which a water collection surface is formed, first and second rim spouts formed in the rim portion for spouting flushing water, and a drainage pipeline connected to the bottom of the bowl portion.
[0003] Such flush toilets are described, for example, in Patent Documents 1 and 2. Patent Document 1 describes a flush toilet that has a first rim spout and a second rim spout located rearward of the first rim spout, and that allows flush water from the second rim spout to flow directly into the pooled water surface. Patent Document 2, like Patent Document 1, also describes a flush toilet that has a first rim spout and a second rim spout, and that allows flush water distributed by a distribution water supply pipe to flow directly from the second rim spout into the pooled water surface. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] JP 2021-113497 A [Patent Document 2] JP 2018-204195 A Summary of the Invention [Problem to be solved by the invention]
[0005] Incidentally, in flush toilets, in order to prevent waste from adhering to the bowl, it is conceivable to form the pooling surface large in order to reduce the area of the waste receiving surface, which is the drying surface. Here, in flush toilets such as those described in Patent Documents 1 and 2 above, flush water from the second rim spout flows directly into the pooling surface, so strong flush water flows into specific areas of the pooling surface. Therefore, in such flush toilets, if the pooling surface is formed large, strong flush water flows into only specific areas of the pooling surface, disturbing the surface of the pooling surface, and it has been found that this may result in the floating waste floating on the surface of the pooling surface not being discharged sufficiently.
[0006] As a result of intensive research, the inventors have concluded that in order to solve the problems caused by forming such a large pooled water surface, that is, in order to reliably discharge floating waste on the pooled water surface, it is necessary to keep the pressing force applied to each area of the pooled water surface by the flush water discharged from the rim spout constant and suppress turbulence on the pooled water surface.To this end, in a flush toilet having a first rim spout and a second rim spout, one method for keeping the pressing force applied to each area of the pooled water surface constant could be, for example, to increase the amount of flush water discharged from the second rim spout to allow the flush water to flow into the pooled water surface earlier.
[0007] However, increasing the amount of flush water spouted from the second rim spout may result in "water splashing" or "water transfer" when flush water is spouted from the second rim spout, which is problematic.
[0008] The inventors discovered problems that arise when forming a large water collecting surface area in a flush toilet, and conducted extensive research to solve these problems, leading to the creation of the present invention.
[0009] The present invention has been made to solve the problems mentioned above, and aims to provide a flush toilet that can suppress splashing and water transfer that occurs when flush water is discharged from the second rim spout, even if the amount of flush water discharged from the second rim spout is increased. [Means for solving the problem]
[0010] 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, comprising a bowl portion equipped with a waste receiving surface that receives waste, a rim portion formed above the waste receiving surface and having an inner circumferential surface, and a jar portion formed below the waste receiving surface and within which a water collection surface is formed, a first water outlet portion provided in the rim portion and forming a first rim spout that spouts flush water forward along the inner circumferential surface of the rim portion, a first water conduit that supplies flush water supplied from the flush water source to the first water outlet portion, a second water outlet portion provided in the rim portion and forming a second rim spout that spouts flush water rearward along the inner circumferential surface of the rim portion, a second water conduit that supplies flush water supplied from the flush water source to the second water outlet portion, and a drainage pipe connected to the bottom of the bowl portion, and is characterized in that an expansion portion is provided above the downstream side of the second rim spout of the rim portion to form a space that expands in the water outlet direction from the second rim spout. In the present invention configured in this manner, an expansion section is provided above the downstream side of the second rim water outlet of the rim section, which forms a space that expands in the water outlet direction from the second rim water outlet.Therefore, air discharged from the second rim water outlet accumulates in the space of this expansion section, generating air pressure, and even if water splashing or water transfer occurs when wash water is discharged from the second rim water outlet, the air pressure generated in the space of the expansion section can suppress water splashing and water transfer.
[0011] In the present invention, preferably an upper surface is provided between the enlarged portion of the rim portion and the second rim spouting outlet, the upper surface extending continuously in the water spouting direction from the upper end of the second rim spouting outlet. In the present invention configured in this manner, an upper surface is provided between the enlarged portion of the rim portion and the second rim spout, extending continuously in the water spouting direction from the upper end of the second rim spout. This upper surface of the rim portion enables the wash water that is spouted from the second rim spout and attempts to flow upwards to be guided in the water spouting direction, further suppressing water splashing and water transfer.
[0012] In the present invention, the top surface of the second water conduit is preferably inclined more downwardly from the upstream to the downstream than the bottom surface of the second water conduit. In the present invention configured in this manner, the upper surface of the second water conduit is inclined more downwardly from upstream to downstream than the bottom surface of the second water conduit, so that the flush water spouted from the second rim spout can flow into the pooled water surface more quickly.
[0013] In the present invention, the upper surface of the second water conduit preferably has an upstream upper surface that slopes downward at a first slope angle, and a downstream upper surface that slopes downward at a second slope angle that is gentler than the first slope angle. In the present invention configured in this manner, the upper surface of the second water conduit has an upstream upper surface that slopes downward at a first inclination angle, and a downstream upper surface that slopes downward at a second inclination angle that is gentler than the first inclination angle, so that flush water supplied to the second water conduit flows downward with pressure loss suppressed by the upstream upper surface, and is discharged from the second rim spout in a state where it has been straightened by the downstream upper surface. As a result, according to the present invention, water splashing and water transfer can be further suppressed, and flush water discharged from the second rim spout can flow into the pool water surface more quickly.
[0014] In the present invention, the second inclination angle of the downstream upper surface of the second water conduit is preferably 20 to 60 degrees with respect to the horizontal direction. In the present invention thus configured, the second inclination angle of the upper surface of the downstream side of the second water conduit is 20 to 60 degrees with respect to the horizontal direction, so that the upper surface of the downstream side of the second water conduit straightens the water while suppressing pressure loss, and further suppresses water splashing and water transfer.
[0015] In the present invention, the second rim spouting port is preferably formed so that its upper end extends at a downward incline from the inside to the outside in a front view, and further so that its inner height is greater than its outer height. In the present invention configured in this way, the upper end of the second rim spout extends at an incline downward from the inside to the outside when viewed from the front, and the height of the inside is greater than the height of the outside, making it easier to form a flow of flush water flowing from the second rim spout into the pooled water surface. Also, the height of the outside of the second rim spout is lower than the height of the inside, making it easier to form a space for the enlarged section outside the second rim spout. As a result, according to the present invention, it is possible to further suppress splashing and water transfer while forming a flow of flush water flowing into the pooled water surface. Effect of the Invention
[0016] According to the flush toilet of the present invention, even if the amount of flush water spouted from the second rim spout is increased, it is possible to suppress splashing and water transfer that occurs when flush water is spouted from the second rim spout. [Brief description of the drawings]
[0017] [Figure 1] FIG. 1 is a vertical cross-sectional view of a flush toilet according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan sectional view taken along line II-II in FIG. [Diagram 3] 3 is a partially enlarged view showing the vicinity of the second rim spouting port in FIG. 2. FIG. [Figure 4] FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG. 2. [Diagram 5] 4 is a partial cross-sectional view of the second water conduit taken along line VV in FIG. 3. [Figure 6] 6 is a cross-sectional view showing the shape of a second rim water outlet and the cross-sectional shape of a second water conduit as viewed along line VI-VI in FIG. 3. [Figure 7] 4 is a partial cross-sectional view taken along lines AA, BB, CC and DD in FIG. 3. [Figure 8] 1 is a partial cross-sectional view of a bowl portion of a flush toilet according to an embodiment of the present invention, viewed from the front. FIG. [Figure 9] FIG. 2 is a partial perspective view of the bowl portion of a flush toilet according to an embodiment of the present invention, viewed diagonally from above and ahead. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] A flush toilet according to an embodiment of the present invention will be described below with reference to the drawings. First, the basic structure of a flush toilet according to this embodiment will be explained with reference to Figures 1 to 3. Figure 1 is a vertical cross-sectional view of a flush toilet according to an embodiment of the present invention, Figure 2 is a plan cross-sectional view taken along line II-II in Figure 1, and Figure 3 is a partially enlarged view showing the vicinity of the second rim spout in Figure 2. In this specification, the front side of the flush toilet as viewed from the user will be referred to as the front side, the back side as the rear side, the right side as the right side, and the left side as the left side.
[0019] As shown in Figures 1 to 3, the flush toilet 1 is a floor-drainage type flush toilet that is placed on the floor. The flush toilet 1 is also a wash-down type toilet that flushes away waste by the flow of water caused by the drop in the bowl. The flush toilet 1 comprises a ceramic toilet body 2 and a water storage tank 4 that stores flush water to supply flush water to clean the toilet body 2. The toilet body 2 comprises a bowl portion 6 on the front side, and a common water passage 8 is formed at the upper rear portion, with an opening 7 provided at the upstream end of the common water passage 8 communicating with the water storage tank 4. Furthermore, a drainage pipe 10 is formed at the lower rear portion of the bowl portion 6 for discharging waste.
[0020] The above-mentioned water storage tank 4 is equipped with a drain valve 12, and when the user opens an operating lever (not shown), the drain valve 12 opens and flushing water in the water storage tank 4 is supplied to the toilet body 2 and discharged from the first rim spout 24 and second rim spout 26 described below.
[0021] In this embodiment, the flush water source may be a water storage tank 4, a directly pressurized tap water source, a flush valve, or a source that supplies flush water using a pump.
[0022] Although the flush toilet 1 is a wash-down toilet, it may also be a siphon-type flush toilet that utilizes the siphon action to discharge waste within the bowl portion 6 to the outside through a drainage pipe.
[0023] The bowl section 6 of the toilet body 2 has a bowl-shaped waste receiving surface 16, a rim section 18 formed above the waste receiving surface 16 and having an inner peripheral surface, and a basin section 22 formed below the waste receiving surface 16 and having a water pooling surface 20 formed therein. Here, the water pooling surface 20 of the basin section 22 is approximately triangular, measuring 160mm to 180mm in the front-to-back direction and 125mm to 145mm in the width direction when viewed from above, and is formed larger (enlarged) than the water pooling surface of a conventional flush toilet. The basin section 22 also has a vertical surface 22a, and is, for example, 200mm to 240mm in the front-to-back direction and 150mm to 190mm in the width direction when viewed from above, forming an approximately triangular shape that is egg-shaped (an elliptical shape tapered at the front) larger than the water pooling surface 20.
[0024] Furthermore, in the rim portion 18 of the bowl portion 6, a first rim spout 24 that spouts flush water is formed on the front side on the left side when viewed from the front, and a second rim spout 26 that spouts flush water is formed on the rear side on the right side when viewed from the front (see Figures 2 and 3). In particular, the first rim spout 24 is provided forward of the front end of the water collecting surface 20, and the second rim spout 26 is provided rearward of the rear end of the water collecting surface 20. Furthermore, in the bowl portion 6, a recess 28 extending from this second rim spout 26 is further formed (Figures 1 to 3).
[0025] The above-mentioned common water passage 8 branches downstream into a first water conduit 30 and a second water conduit 32, with the first water conduit 30 extending to the first rim water outlet 24 and the second water conduit 32 extending to the second rim water outlet 26, and flush water stored in the water storage tank 4 being supplied to the first rim water outlet 24 and the second rim water outlet 26. Here, the first rim water outlet 24 and the second rim water outlet 26 are adapted to spout flush water in a direction that forms a swirling flow that swirls in the same direction. In the case of this embodiment, a counterclockwise swirling flow is formed.
[0026] Next, the structure on the downstream side of the second rim spouting port 26 will be described with reference to Figure 4. Figure 4 is a partial cross-sectional view taken along line IV-IV in Figure 2. As shown in Figure 4, the bottom surface 32a of the second water conduit 32 extends in a substantially flat plane, while the recess 28 of the bowl section 6 downstream of the second rim water outlet 26 is curved in an arc shape. The boundary between the bottom surface 32a of the second water conduit 32 and the curved shape of the recess 28 extends vertically upward to form the second rim water outlet 26. This second rim water outlet 26 is shown by a dashed line in Figure 4. Furthermore, as shown by the dashed line in Figure 3, the second rim water outlet 26 is inclined inwards in a plan view, and is oriented toward the pooled water surface 20, as will be described later.
[0027] As shown in Figure 4, on the downstream side of the second rim water spout 26 of the rim 18, an upper surface 34 is formed that extends continuously from the upper end of the second rim water spout 26, sloping downward along the water spouting direction. On the downstream side of this upper surface 34, an expansion section 36 is formed that forms a space that expands upward along the water spouting direction of the second rim water spout 26.
[0028] Next, the second water conduit 32 will be described with reference to Fig. 5. Fig. 5 is a partial cross-sectional view of the second water conduit taken along line VV in Fig. 3. As shown in FIG. 5, the second water conduit 32 has a lower surface 32a and an upper surface 32b. The upper surface 32b is composed of an upstream upper surface 32c and a downstream upper surface 32d. From upstream to downstream, the upstream upper surface 32c is inclined downward at an angle θ1 which is a first inclination angle, and the downstream upper surface 32d is inclined downward at an angle θ2 which is a second inclination angle. Here, the second inclination angle θ2 is preferably in the range of 20 degrees to 60 degrees with respect to the horizontal direction, and more preferably 30 degrees. On the other hand, the lower surface 32a is inclined downward at an angle θ3 from upstream to downstream. These inclination angles are formed so as to satisfy the relationship θ1>θ2>θ3.
[0029] Thus, in this embodiment, the top surface 32b of the second water conduit 32 is inclined more downward from upstream to downstream than the bottom surface 32a of the second water conduit 32. Furthermore, the top surface 32b of the second water conduit 32 has an upstream top surface 32c that inclines downward at a first inclination angle θ1 from upstream to downstream, and a downstream top surface 32d that inclines downward at a second inclination angle θ2 that is gentler than the first inclination angle θ1.
[0030] Next, the shape of the second rim water outlet and the cross-sectional shape of the second water conduit will be described with reference to Fig. 6. Fig. 6 is a cross-sectional view showing the shape of the second rim water outlet and the cross-sectional shape of the second water conduit as viewed along line VI-VI in Fig. 3. As shown in FIG. 6, the second rim spout 26 has a generally rectangular shape when viewed from the front, and further, its upper end (upper surface) 26a extends at a downward incline from the inside to the outside, and further, is formed so that its inner height H1 is greater than its outer height H2.
[0031] 6, the second rim spout 26 has an outer lower corner 26b formed with a first radius of curvature R1 in a front view, and an inner lower corner 26c formed with a second radius of curvature R2. Furthermore, the first radius of curvature R1 is formed to be larger than the second radius of curvature R2 (R1>R2).
[0032] As shown in FIG. 6, the cross section of the second water conduit 32 is formed such that an outer lower corner 32e and an inner lower corner 32f have the same radius of curvature R3.
[0033] Next, the relationship between the shape of second rim spouting port 26 and the shape of recess 28 in bowl section 6 downstream of second rim spouting port 26 will be explained with reference to Figure 7. Figure 7 is a partial cross-sectional view taken along lines AA, BB, CC, and DD in Figure 3. In Figure 7, the cross section along line AA shows the shape of the inner lower part of the second rim spout 26, and lines BB, CC, and DD show the cross-sectional shape (surface shape) of the recess 28 in the bowl portion 6 downstream of the second rim spout 26.
[0034] 7, in this embodiment, the recess 28 of the bowl section 6 downstream of the second rim water outlet 26 is formed continuous with the outer lower corner 26b of the second rim water outlet 32, and is formed with radii of curvature R4, R5, R6 that gradually increase in the water outlet direction from the first radius of curvature R1 of the outer lower corner 26b of the second rim water outlet 32. Note that the radii of curvature R4, R5, and R6 are each the average value of multiple radii of curvature.
[0035] Next, the spouting direction of flush water from the second rim spout 26 in this embodiment will be explained with reference to Figures 8 and 9. Figure 8 is a partial cross-sectional view of the bowl part 6 of a flush toilet according to this embodiment, seen from the front, and Figure 9 is a partial perspective view of the bowl part 6 of a flush toilet according to this embodiment, seen diagonally from above and ahead.
[0036] 8 and 9, the bottom surface 32a of the second water conduit 32 on the upstream side of the second rim water outlet 26 is inclined downward from the upstream side by an angle θ3 as described above. In this embodiment, the extension line A of the bottom surface 32a of the second water conduit 32 inclined downward intersects with the vertical surfaces 22a on both sides of the bowl portion 22 above the maximum rising water level B of the pool water surface 20 during washing.
[0037] Furthermore, as shown in FIGS. 3 and 9, the second rim water spouting port 26 is formed so as to be oriented toward the left vertical surface 22a of the pot portion 22, which is the side opposite the second rim water spouting port 26.
[0038] The flush toilet 1 according to the present embodiment described above is a toilet that is equipped with a first rim spout 24 and a second rim spout 26 provided in the rim portion 18, and performs flushing operations using only flush water supplied from each rim spout. However, this embodiment can also be applied to flush toilets that spout flush water from sources other than a rim spout, such as jet spouting.
[0039] Next, the effects of the flush toilet 1 according to this embodiment will be explained. First, in the flush toilet 1 of this embodiment, an expansion section 36 is provided above the downstream side of the second rim spout 26 of the rim portion 18, forming a space that expands in the water spout direction from the second rim spout 26. Therefore, air discharged from the second rim spout 26 accumulates in the space of this expansion section 36, generating air pressure, and even if water splashing or water transfer occurs when flushing water is discharged from the second rim spout 26, the air pressure generated in the space of the expansion section 36 can suppress water splashing and water transfer.
[0040] Furthermore, in the flush toilet 1 of this embodiment, an upper surface 34 is provided between the enlarged portion 36 of the rim portion 18 and the second rim spout 26, which extends continuously in the spouting direction from the upper end of the second rim spout 26. This upper surface 34 of the rim portion 18 makes it possible to guide the flush water that is spouted from the second rim spout 26 and attempts to flow upwards in the spouting direction, further suppressing splashing and water transfer.
[0041] Furthermore, in the flush toilet 1 of this embodiment, the upper surface 32b of the second water conduit 32 is inclined more downwardly from upstream to downstream than the bottom surface 32a of the second water conduit 32, so that the flush water spouted from the second rim spout 26 can flow into the pool surface more quickly.
[0042] Furthermore, in the flush toilet 1 according to this embodiment, the upper surface 32b of the second water conduit 32 is equipped with an upstream upper surface 32c that slopes downward at a first inclination angle θ1, and a downstream upper surface 32d that slopes downward at a second inclination angle θ2 that is gentler than the first inclination angle θ1, so that flush water supplied to the second water conduit 32 flows downward with pressure loss suppressed by the upstream upper surface 32c, and is discharged from the second rim spout 26 in a state where it has been straightened by the downstream upper surface 32d. As a result, according to this embodiment, water splashing and water transfer are further suppressed, and flush water discharged from the second rim spout 26 can flow into the pool surface more quickly.
[0043] Furthermore, in the flush toilet 1 of this embodiment, the second inclination angle θ2 of the downstream upper surface 32d of the second water conduit 32 is 20 to 60 degrees with respect to the horizontal direction, and this downstream upper surface 32d of the second water conduit 32 rectifies the water while suppressing pressure loss, further suppressing water splashing and water transfer.
[0044] Furthermore, in the flush toilet 1 according to this embodiment, the upper end of the second rim spout 26 extends at a downward incline from the inside to the outside when viewed from the front, and furthermore, the inner height H1 is formed to be greater than the outer height H2, making it easier to form a flow of flush water flowing from the second rim spout 26 into the pooled water surface 20. Also, because the outer height H2 of the second rim spout 26 is lower than the inner height H1, it is easier to form a space for the expansion section 36 outside the second rim spout 26. As a result, according to this embodiment, it is possible to form a flow of flush water flowing into the pooled water surface 20 while further suppressing splashing and water transfer.
[0045] Furthermore, in conventional flush toilets, the radius of curvature of the outer lower corner and the inner lower corner of the second rim spout are the same, and the flush water spouted from the second rim spout simply swirls around the inner surface of the rim. However, in this embodiment, the second rim spout 26 is formed such that, in front view, the outer lower corner 26b is formed with a first radius of curvature R1, and the inner lower corner 26c is formed with a second radius of curvature R2, and further, the first radius of curvature R1 is formed to be larger than the second radius of curvature R2. Therefore, on the outside of the second rim spout 26, the corner 26b with a large radius of curvature forms a flow with energy that flush water runs up the recess 28 of the bowl portion 6 and drops onto the pooled water surface 20. Furthermore, on the inside of the second rim spout 26, the corner 26c with a small radius of curvature allows a gentle flow that runs up less than the outside of the second rim spout 26 to be spouted toward the pooled water surface 20. Therefore, even if the amount of flush water spouted from the second rim spout 26 is increased, the flush water spouted from the second rim spout 26 can flow into the pooled water surface 20.
[0046] Furthermore, in the flush toilet 1 according to this embodiment, the flow path cross section of the second water conduit 32 is formed so that the outer lower corner 32e and the inner lower angle 32f have the same radius of curvature R3, so the flush water in the second water conduit 32 can flow towards the second rim spout 26 without being disturbed.
[0047] Furthermore, in the flush toilet 1 of this embodiment, the bowl section 6 downstream of the second rim spout 26 is formed contiguous with the outer lower corner 26b of the second rim spout 26, and is formed with radii of curvature (R4, R5, R6) that gradually increase from the first radius of curvature R1 in the direction of flush water spouting, so that much of the flush water spouted from the second rim spout 26 can be guided to the pool surface.
[0048] Furthermore, in the flush toilet 1 according to this embodiment, the upper surface 32b of the second water conduit 32 is inclined downward from upstream to downstream, so that flush water spouted from the second rim spout 26 can be spouted towards the pool surface 20.
[0049] Furthermore, in the flush toilet 1 according to this embodiment, the bottom surface 32a of the second water conduit 32 is configured to slope downward in the spouting direction of the flush water spouted from the second rim spout 26, and an extension line A of this bottom surface 32a intersects with the vertical surface 22a of the basin section 22 above the maximum risen water level B of the pooled water level 20 during flushing, so that the flush water spouted from the second rim spout 26 can flow into the pooled water level 20 early, and further, the flush water can be caused to flow into the pool so as to cover the raised pooled water level 20 from above. As a result, according to this embodiment, a vertical swirling flow can be formed within the basin section 22, and the timing of the discharge of floating waste can be accelerated.
[0050] Furthermore, in the flush toilet 1 according to this embodiment, the second rim spout 26 is formed so as to be oriented toward the pooled water surface 20, so that flush water spouted from the second rim spout 26 can be spouted toward the pooled water surface 20. [Explanation of symbols]
[0051] 1 flush toilet 2 Toilet bowl body 4. Water tank 6 Bowl section 10 Drainage line 16 Waste receiving surface 18 Rim section 20 Water surface 22 Pressure Point Section 22a Vertical surface 24 First rim outlet 26 Second rim outlet 26a top end 26b Lower outer corner 26c Inner bottom corner 28 Recess 30 First Waterway 32 Second Waterway 32a Bottom 32b Top surface 32c Upstream side top surface 32d Downstream top surface 32e Lower outer corner 32f Inner lower corner 34 Top side 36 Enlarged section θ1, θ2, θ3 Tilt angle R1~R6 Radius of curvature H1, H2 height A extension line B Maximum rising water level of the reservoir
Claims
1. A flush toilet that discharges waste using flush water supplied from a flush water source, a bowl portion including a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface and having an inner peripheral surface, and a basin portion formed below the waste receiving surface and having a water collecting surface formed therein; a first water discharge section that is provided on the rim section and forms a first rim water discharge port that discharges flush water forward along the inner circumferential surface of the rim section; a first water conduit that supplies flush water supplied from the flush water source to the first water discharge section; a second water discharge section that is provided in the rim section and forms a second rim water discharge port that discharges flush water rearward along the inner circumferential surface of the rim section; a second water conduit that supplies flush water supplied from the flush water source to the second water discharge section; a drainage line connected to the bottom of the bowl portion, A flush toilet in which the upper surface of the second water conduit is inclined more downward from upstream to downstream than the bottom surface of the second water conduit, and is provided with an upstream upper surface that inclines downward at a first inclination angle, and a downstream upper surface that inclines downward at a second inclination angle that is gentler than the first inclination angle.
2. 2. The flush toilet according to claim 1, wherein the second inclination angle of the upper surface of the downstream side of the second water conduit is 20 to 60 degrees with respect to the horizontal direction.
3. 3. The flush toilet according to claim 1 or 2, wherein the upper end of the second rim spout extends at an angle downward from the inside to the outside when viewed from the front, and further wherein the height of the inside is greater than the height of the outside.