Water-washable toilet

Abstract

To provide a flush toilet bowl that can smoothly guide washing water containing dirt flowing into an inclined part from a bent part of a drain trap part to a dropping part, and can suppress clogging of the dirt.SOLUTION: A flush toilet bowl 1 according to the present invention comprises a bowl part 6 and a drain trap part 8. The drain trap part comprises: a bent part 30; a forward inclined part 32; a rearward inclined part 34; a dropping part 36; a first joint part 38 that joins the forward inclined part and the dropping part with a first curved surface C1; and a second joint part 40 that joins the rearward inclined part and the dropping part with a second curved surface C2. An entire vertical part from a lower end 40a to an upper end 40b of the second joint part is located within a vertical height range from a lower end 38a to an upper end 30b of the first joint, and the upper end of the first joint part is set at a position higher than the upper end of the second joint part.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that is washed with washing water and discharges dirt.

Background Art

[0002] Conventionally, as a flush toilet that is washed with washing water and discharges dirt, for example, as described in Patent Document 1, there is known one having a drain trap portion that is connected below the bowl portion of the toilet body and discharges the dirt in the bowl portion. This drain trap portion includes a bent portion that descends from an inlet portion connected to the bowl portion backward and downward, and then extends upward backward and upward, an inclined portion that inclines backward and downward from the downstream end of this bent portion, and a vertical portion that extends downward from the lower end of this inclined portion. With these, the washing water and dirt in the bowl portion of the toilet body are discharged from the inlet portion of the drain trap portion into the bent portion of the drain trap portion. Thereafter, the dirt that has passed through the bent portion of the drain trap portion together with the washing water passes through the inclined portion of the drain trap portion on the downstream side, and then is discharged to the outside from the vertical portion of the drain trap portion. Also, in the conventional flush toilet described in Patent Document 1 mentioned above, since the inclined portion of the drain trap portion is joined to the upper end portion on the front side of the vertical portion after descending downward from the upper end portion on the rear side of the bent portion, the washing water flowing down along the inclined portion mainly flows in from the front side of the vertical portion. Furthermore, a flow path is also formed in the region on the rear side of the vertical portion and above the vertical portion in the drain trap portion, and the washing water flowing into this flow path can also flow in from the rear side of the vertical portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] However, in the conventional flush toilet described in Patent Document 1 above, the flushing water has difficulty circulating to the walls and other surfaces within the flow path behind the hanging portion and above the hanging portion within the drain trap section, particularly behind and above the water level. This presents a problem in that, on the wall surface of the flow path behind and above the hanging portion, there is a risk that attached waste may be left behind, or even that blockage of waste may occur. Furthermore, if waste accumulates in the sloping or hanging sections of the drain trap without being completely discharged, an unpleasant odor may be generated within the drain trap, and this odor may backflow into the bowl section when flushing the toilet. Therefore, a pressing issue in recent years is how to smoothly guide the cleaning water containing waste that flows from the bend in the drain trap section into the inclined section, and how to prevent clogging by waste.

[0005] Therefore, the present invention has been made to solve the problems of the prior art described above and the issues that have been requested in recent years, and aims to provide a flush toilet that can smoothly guide the flushing water containing waste that flows from the bent part of the drain trap to the inclined part to the hanging part, thereby suppressing clogging of waste. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a flush toilet that washes away waste with flushing water, comprising a bowl-shaped bowl section and a drain trap section having an inlet connected to the lower part of the bowl section for discharging waste from the bowl section, wherein the drain trap section has a bent section that descends backward and downward from its inlet and then extends to rise backward and upward, a forward inclined section that slopes backward and downward from the downstream end of the bent section, and a section provided to face the rearward side of the forward inclined section The structure comprises a rearward-sloping section, hanging sections that hang down downstream of the front-sloping section and the rearward-sloping section, a first joint that connects the front-sloping section and the hanging section by a first curved surface, and a second joint that connects the rearward-sloping section and the hanging section by a second curved surface. The entire vertical portion of the second joint, from its lower end to its upper end, is located within the range of the vertical height positions from the lower end to the upper end of the first joint, and the upper end of the first joint is set higher than the upper end of the second joint. In the present invention configured as described above, the cleaning water and waste in the bowl section are discharged from the inlet of the drain trap section into the bent section of the drain trap section. Subsequently, the waste that has passed through the bent section of the drain trap section together with the cleaning water passes through the forward and rearward inclined sections of the drain trap section downstream thereafter, and is then discharged to the outside from the hanging section of the drain trap section. Furthermore, when the washing water and waste that have passed through the bend in the drain trap section pass through the forward and rearward inclined sections of the drain trap section, the upper end of the first joint, which connects the forward inclined section and the hanging section by a first curved surface, is set to be higher than the upper end of the second joint, which connects the rearward inclined section and the hanging section by a second curved surface. As a result, the washing water and waste passing through the forward and rearward inclined sections can be guided from the forward side (the side of the first curved surface of the first joint of the forward inclined section) to the lower hanging section, preferentially over the rear side (the side of the rearward inclined section). As a result, waste is less likely to be guided towards the rearward sloping section and is instead guided from the forward side (the first curved surface side of the first joint of the forward sloping section) to the downward hanging section, thus preventing waste from clogging the flow path downstream of the bend in the drain trap section.

[0007] In the present invention, preferably, the rearward inclined portion is set such that, in a side cross-sectional view, its inclination angle with respect to the horizontal plane is greater than the inclination angle of the front inclined portion. In the present invention configured as described above, the inclination angle of the rearward inclined section with respect to the horizontal plane in a side cross-sectional view is set to be greater than the inclination angle of the front inclined section. Therefore, the washing water and waste passing through the front inclined section and the rearward inclined section can be guided to the hanging section early in the drainage area on the front side (the first curved surface side of the first joint of the front inclined section). Furthermore, the rearward inclined section, with a greater inclination angle than the front inclined section, can impart a strong pushing force to the washing water. This ensures that the washing water, with its powerful pushing force from the rear, reliably pushes the waste into the downward-hanging section.

[0008] In the present invention, preferably, the hanging portion is provided with a hanging inlet that is joined to the first joint and the second joint, and in a plan view of the hanging inlet, the flow channel cross-sectional area on the front side of the central axis in the front-rear direction of the flow channel cross-section is set to be larger than the flow channel cross-sectional area on the rear side of the central axis. In the present invention configured as described above, in a plan view of the hanging inlet, the cross-sectional area of ​​the flow channel on the front side of the central axis in the front-rear direction of the flow channel cross-section is set to be larger than the cross-sectional area of ​​the flow channel on the rear side. Therefore, when waste from the upstream side of the hanging section flows into the hanging section from the hanging inlet, the waste can be guided into the hanging section early in the front side of the drainage area. [Effects of the Invention]

[0009] According to the flush toilet of the present invention, the flushing water containing waste that flows from the bent part of the drain trap to the inclined part can be smoothly guided to the hanging part, thereby suppressing clogging of waste. [Brief explanation of the drawing]

[0010] [Figure 1]This is a schematic plan view of a flush toilet according to one embodiment of the present invention. [Figure 2] This is a side cross-sectional view along line II-II in Figure 1. [Figure 3] Figure 2 is a side cross-sectional view of a flush toilet according to one embodiment of the present invention, showing an enlarged side cross-sectional view of the downstream end portion of the drain trap section of the toilet body. [Figure 4] This is a cross-sectional view along line IV-IV in Figure 2. [Modes for carrying out the invention]

[0011] A flush toilet according to one embodiment of the present invention will be described below with reference to Figures 1 to 4. First, Figure 1 is a schematic plan view of a flush toilet according to one embodiment of the present invention. Figure 2 is a side cross-sectional view along line II-II in Figure 1. As shown in Figures 1 and 2, a flush toilet 1 according to one embodiment of the present invention comprises a ceramic toilet bowl body 2. The toilet body 2 comprises a water channel 4, a bowl-shaped bowl section 6, and a drain trap section 8 (details to be described later) with an inlet 8a connected below the bowl section 6, running from upstream to downstream. As a result, the flush toilet 1 according to one embodiment of the present invention is a so-called "siphon-type flush toilet" that uses the siphon action to suck up the waste in the bowl 6 and discharge it to the outside all at once from the drain trap 8. Furthermore, the flush toilet 1 according to one embodiment of the present invention is not limited to the form of a siphon-type flush toilet, but can also be applied to the form of a so-called "wash-down type flush toilet" that washes away waste with the flowing water action caused by the difference in water level in the bowl.

[0012] Furthermore, in the flush toilet 1 of this embodiment shown in Figures 1 and 2, a toilet seat (not shown) and a toilet lid (not shown) are provided on the upper surface of the toilet body 2, but since this is the same as the structure of a conventional flush toilet, a detailed explanation will be omitted. Furthermore, on the upper surface of the toilet body 2, on the rear side of the toilet seat (not shown) and the toilet lid (not shown), there may be provided functional parts such as a sanitary washing part (not shown) for washing the user's private parts and a water supply system functional part (not shown) involved in the water supply function to the toilet body 2. However, since these are the same as the structure of a conventional flush toilet, specific descriptions thereof are omitted.

[0013] Next, as shown in FIG. 1, the flush toilet 1 according to an embodiment of the present invention includes a gravity-fed water storage tank 10 that stores washing water used for toilet washing and supplies water to the toilet body 2. Here, in the present embodiment, the washing water source for supplying washing water to the toilet body 2 is not limited to the tank type such as the above-described gravity-fed water storage tank 10, and other forms are also applicable. That is, as the washing water source for supplying washing water to the toilet body 2, a direct-pressure water supply type using the water supply pressure of tap water or a flush valve type may be used, or a form that supplies washing water using the pressure boost of a pump may also be used.

[0014] Next, in the flush toilet 1 according to an embodiment of the present invention shown in FIG. 1, in a plan view of the bowl portion 6 of the toilet body 2, a central axis extending in the horizontal left-right direction so as to bisect the pot portion 12 provided at the left-right center of the bowl portion 6 in the front-rear direction is indicated by the symbol "X". Also, in a plan view of the bowl portion 6 of the toilet body 2 shown in FIG. 1, a central axis extending in the horizontal front-rear direction so as to bisect the bowl portion 6 in the left-right direction is indicated by the symbol "Y". Furthermore, in a plan view of the bowl portion 6 of the toilet body 2 shown in FIG. 1, the intersection of the respective central axes X and Y is taken as the center O of the bowl portion 6 in the plan view, and a central axis extending in the vertical direction passing through this center O is indicated by the symbol "Z" in FIGS. 1 and FIG. 2. Also, as shown in FIG. 1, with respect to the front, rear, left, and right directions of the flush toilet 1, they are respectively indicated by "front", "rear", "left", and "right".

[0015] Furthermore, as shown in Figures 1 and 2, in the flush toilet 1 of this embodiment, the area within the bowl portion 6 that is forward of the central axis X is defined as the "front region F of the bowl portion 6". In addition, within this front region F of the bowl portion 6, the left region L and the right region R are defined as the "left front region LF of the bowl portion 6" and the "right front region RF of the bowl portion 6" with respect to the central axis Y in the horizontal front-rear direction of the bowl portion 6, respectively. Similarly, within the bowl portion 6, the area behind the central axis X is defined as the "rear area B of the bowl portion 6". Furthermore, within this rear area B of the bowl portion 6, the left area L and the right area R are defined as the "left rear area LB of the bowl portion 6" and the "right rear area RB of the bowl portion 6" with respect to the horizontal front-rear central axis Y of the bowl portion 6, respectively.

[0016] Next, as shown in Figure 1, the water conduit 4 located upstream of the toilet bowl body 2 is formed on the rear side of the bowl portion 6 and guides the flushing water supplied from the water storage tank 10 to the bowl portion 6. Furthermore, as shown in Figures 1 and 2, the bowl portion 6 located downstream of the water conduit 4 of the toilet body 2 is equipped with a pot portion 12, a waste receiving surface 14, a shelf portion 16, and a rim portion 18, which will be described in detail later, from bottom to top. Furthermore, a first rim outlet 20 is provided on the front side of the rim portion 18 in the left rear region LB of the bowl portion 6, and a second rim outlet 22 is provided on the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6.

[0017] Next, as shown in Figures 1 and 2, the water conduit 4 comprises a common water conduit 24, a first rim water conduit 26, and a second rim water conduit 28. First, the common water conduit 24 is formed inside the toilet bowl body 2 on the rear side of the bowl section 6, extending from the rear inlet 4a connected to the water storage tank 10 to the vicinity of the rear side of the front bowl section 6. Furthermore, the first rim water channel 26 is formed inside the rim portion 18 of the left rear region LB of the bowl portion 6, branching off from the common water channel 24 to the left side of the bowl portion 6 near the rear side of the bowl portion 6, and then extending to the first rim outlet 20 on the front side while bypassing the outer surface of the bowl portion 6. As a result, the cleaning water supplied from the common water channel 24 to the first rim water channel 26 is discharged forward as the first rim discharge from the first rim discharge port 20 toward the shelf section 16 in front of it, and then forms a swirling flow within the bowl section 6, moving from the left front region LF through the right front region RF to the right rear region RB.

[0018] Furthermore, the second rim water channel 28 branches off from the common water channel 24 to the right side of the bowl section 6 near the rear side of the bowl section 6, then bends (U-turns) towards the second rim outlet 22 on the left side near the right side of the toilet body 2, and is formed inside the rear side of the rim section 18 in the right rear region RB of the bowl section 6 so as to extend to the second rim outlet 22. As a result, the cleaning water supplied from the common water channel 24 to the second rim water channel 28 is discharged from the second rim outlet 22 towards the shelf section 16 behind it as the second rim discharge, then swirls from the right rear area RB through the left rear area LB to the left front area LF within the bowl section 6, and finally flows from this left front area LF into the front area within the pot section 12. Furthermore, a portion of the water discharged from the second rim outlet 22 flows into the rear area of ​​the bowl portion 12 from the waste receiving surface 14 in the area behind the bowl portion 12. In this embodiment, the shelf portion 16 of the bowl portion 6 is described as being provided between the outer edge of the waste receiving surface 14 and the lower end of the rim portion 18. However, it is not necessary to provide the shelf portion 16, and the shelf portion 16 may be omitted, with the first rim discharge and second rim discharge, respectively, being discharged from the first rim discharge port 20 and the second rim discharge port 22, being discharged directly to the upper edge of the waste receiving surface 14 without passing through the shelf portion 16.

[0019] Next, with reference to Figures 1 to 4, the details of the drain trap section 8 and its downstream portion will be described. Figure 3 is an enlarged side cross-sectional view of the downstream end portion of the drain trap section of the toilet bowl body, in the side cross-sectional view of the flush toilet according to one embodiment of the present invention shown in Figure 2. Figure 4 is a cross-sectional view along the line IV-IV in Figure 2. First, as shown in Figure 2, the drain trap section 8 is equipped with a bent section 30, a forward-sloping section 32, a rearward-sloping section 34, and a hanging section 36, respectively, from its upstream side (inlet 8a side) to its downstream side.

[0020] As shown in Figure 2, the bent portion 30 of the drain trap section 8 descends from the inlet 8a of the drain trap section 8 toward the rear and downward to the lowest end 30a, and then extends further toward the rear and upward from this lowest end 30a. Next, as shown in Figures 2 and 3, the forward inclined portion 32 of the drain trap section 8 is formed to incline backward and downward from the downstream end (rear end 30b) of the bent portion 30. Furthermore, as shown in Figures 2 and 3, the rearward inclined portion 34 of the drain trap section 8 is provided so as to face the rearward inclined portion 32. Furthermore, as shown in Figures 2 and 3, the hanging portion 36 of the drain trap section 8 is positioned below the lower ends of the forward-sloping portion 32 and the rearward-sloping portion 34, respectively, forming a downward-hanging pipe.

[0021] Furthermore, as shown in Figure 3, the drain trap section 8 further includes a first joint section 38 that joins the forward inclined section 32 and the hanging section 36 by a curved surface (first curved surface C1), and a second joint section 40 that joins the rear inclined section 34 and the hanging section 36 by a curved surface (second curved surface C2). Furthermore, as shown in Figure 3, the height range H1 of the entire vertical portion of the second joint 40 from its lower end 40a to its upper end 40b is located within the height range H2 of the first joint 38 from its lower end 38a to its upper end 38b, and the upper end 38b of the first joint 38 is set to a higher position than the upper end 40b of the second joint 40.

[0022] In the cross-sectional view of Figure 3, the curvature of the first curved surface C1 in the section between the lower end 38a and the upper end 38b of the first joint 38 is set to be greater than the curvature of the inner wall surface 32a of the forward inclined portion 32 above the upper end 38b of the first joint 38. Furthermore, in the side cross-sectional view of Figure 3, the curvature of the first curved surface C1 of the first joint 38 is set to be greater than the curvature of the inner wall surface 36a of the hanging portion 36 below the lower end 38a of the first joint 38. Similarly, in the side cross-sectional view of Figure 3, the curvature of the second curved surface C2 in the section between the lower end 40a and the upper end 40b of the second joint 40 is set to be greater than the curvature of the inner wall surface 34a of the rearward inclined portion 34 above the upper end 40b of the second joint 40. Furthermore, in the side cross-sectional view of Figure 3, the curvature of the second curved surface C2 of the second joint 40 is set to be greater than the curvature of the inner wall surface 36a of the hanging portion 36 below the lower end 40a of the second joint 40. Furthermore, in the side cross-sectional view shown in Figure 3, the curvature of the first curved surface C1 of the first joint 38 is set to be greater than the curvature of the second curved surface C2 of the second joint 40.

[0023] Next, as shown in Figure 3, the rearward inclined portion 34 is set such that, in a side cross-sectional view, the inclination angle α of its inner wall surface 34a with respect to the horizontal plane is greater than the inclination angle β of the inner wall surface 32a of the frontward inclined portion 32 (α>β). Furthermore, as shown in Figure 4, the hanging portion 36 is provided with a hanging inlet 36b that is joined to the first joint 38 and the second joint 40. In the plan cross-sectional view of Figure 4, the hanging inlet 36b is set such that the flow channel cross-sectional area A1 on the front side of the central axis O1 in the front-rear direction of the flow channel cross-section S0 is larger than the flow channel cross-sectional area A2 on the rear side of the central axis O1 (A1 > A2).

[0024] According to the flush toilet 1 of the embodiment described above, the flushing water and waste in the bowl portion 6 of the toilet body 2 are discharged into the bent portion 30 of the drain trap portion 8 from the inlet 8a of the drain trap portion 8. Subsequently, the waste that has passed through the bent section 30 of the drain trap section 8 along with the flushing water passes through the forward inclined section 32 and the rear inclined section 34 of the drain trap section 8 downstream, and is then discharged from the hanging section 36 of the drain trap section 8 to the drain pipe (not shown) outside the flush toilet 1 via a drain socket (not shown). Furthermore, when the washing water and waste W that have passed through the bent portion 30 of the drain trap portion 8 pass through the forward inclined portion 32 and the rear inclined portion 34 of the drain trap portion 8, the height range H1 of the entire vertical portion of the second joint portion 40 from the lower end 40a to the upper end 40b is located within the height range H2 of the first joint portion 38 from the lower end 38a to the upper end 38b, and the upper end 38b of the first joint portion 38 is set to be higher than the upper end 40b of the second joint portion 40. As a result, the washing water and waste W passing through the forward-sloping section 32 and the rear-sloping section can be guided from the forward side (the side of the first curved surface C1 of the first joint 38 of the forward-sloping section 32) to the downward-hanging section 36, preferentially over the rear side (the side of the rear-sloping section 34). As a result, waste is less likely to be guided towards the rearward inclined section 34 and is instead guided from the forward side (the first curved surface C1 side of the first joint 38 of the forward inclined section 32) to the downward hanging section 36, thereby preventing waste from clogging the flow path downstream of the bend 30 of the drain trap section 8.

[0025] Furthermore, according to the flush toilet 1 of this embodiment, as shown in Figure 3, the inclination angle α of the rearward inclined portion 34 with respect to the horizontal plane in a side cross-sectional view is set to be greater than the inclination angle β of the frontward inclined portion 32. As a result, the washing water and waste W passing through the forward-sloping section 32 and the rear-sloping section 34 can be guided to the hanging section 36 early in the forward-facing section (the first curved surface C1 side of the first joint 38 of the forward-sloping section 32). Furthermore, the rearward inclined section 34, with an inclination angle α greater than the inclination angle β of the front inclined section 32, can provide a strong pushing force to the washing water. As a result, the washing water, which also has a strong pushing force from the rear, can reliably push the waste into the downward hanging section 36.

[0026] Furthermore, according to the flush toilet 1 of this embodiment, as shown in Figure 4, in a plan view of the hanging inlet 36b, the flow path cross-sectional area A1 on the front side of the central axis O1 in the front-rear direction of the flow path cross-section S0 is set to be larger than the flow path cross-sectional area A2 on the rear side. As a result, when waste from the upstream side of the hanging section 36 flows into the hanging section 36 from the hanging inlet 36b, the waste can be guided into the hanging section 36 early in the forward watershed. [Explanation of Symbols]

[0027] 1 flush toilet 2 Toilet bowl 4. Water conduit 4a Entrance to the water conduit 6 Bowl section 8. Drain trap section 8a Inlet of drain trap section 10 Water storage tanks 12. Jar section 14. Waste receiving surface 14a Lower edge of the waste receiving surface 16 Shelf 18 Rim section 20 First rim outlet 22 Second rim outlet 24 Common water conduit 26. First Rim Waterway 28. Second Rim Waterway 30 Bend section of the drain trap 30a Lowermost part of the bend 30b Downstream end and rear end of the bent section 32 Forward inclined section of the drain trap 32a Inner wall surface of the forward-sloping section 34 Rearward inclined section of the drain trap 34a Inner wall surface of the rearward inclined section 36. Hanging portion of the drain trap 36a Inner wall surface of the hanging section 36b Drooping entrance 38 1st joint 38a Lower end of the first joint 38b Upper end of the first joint 40 Second joint 40a Lower end of the second joint 40b Upper end of the second joint A1 Flow channel cross-sectional area of ​​the flow channel cross-section of the hanging inlet, forward of the central axis in the anterior-posterior direction A2 Flow channel cross-sectional area behind the central axis in the anterior-posterior direction of the flow channel cross-section of the hanging inlet B Rear area of ​​the bowl C1 1st curved surface C2 2nd surface F Anterior region of the bowl section H1 The range of height positions of the entire vertical portion from the lower end to the upper end of the second joint. H2 The range of height positions of the entire vertical portion from the lower end to the upper end of the first joint. Left side area of ​​the L-shaped bowl Left rear area of ​​the LB bowl LF (Left Front Area of ​​Bowl) O The center of the bowl section, the center of the vase section in the front-to-back direction. O1 Central axis in the anterior-posterior direction of the flow channel cross-section of the hanging inlet Right side of the R bowl section RB Bowl section, right rear area Right front area of ​​the RF bowl Cross-section of the channel at the S0 hanging inlet W Washing water and waste The horizontal left-right central axis of the X-shaped bowl section. The horizontal front-to-back central axis of the Y-shaped bowl section. The vertical central axis passing through the center of the Z bowl section. α Inclination angle of the inner wall surface of the rearward inclined section of the drain trap β Inclination angle of the inner wall surface of the forward inclined section of the drain trap

Claims

1. A flush toilet that uses flushing water to wash away waste, The bowl-shaped bowl section, It has an inlet connected to the lower part of the bowl and a drain trap section for discharging waste from the bowl, The drain trap section described above has a bent section that extends from its inlet downwards and backwards, and then rises upwards and backwards, A forward-sloping section that slopes rearward and downward from the downstream end of this bend, A rearward-sloping section is provided to face the rearward-sloping section of this forward-sloping section, The hanging portions that extend downstream from the forward-sloping portion and the backward-sloping portion, A first joint portion that joins the above-mentioned forward-sloping portion and the above-mentioned hanging portion by a first curved surface having a first curvature in a central side cross-sectional view, The system includes a second joint that joins the aforementioned rearward inclined portion and the aforementioned hanging portion by a second curved surface having a second curvature in a central side cross-sectional view, The upper end of the rearward inclined portion is located below the upper end of the forward inclined portion, and in the central side cross-sectional view of the first joint and the second joint, the first curvature of the first curved surface is set to be greater than the curvature of the inner wall surface of the forward inclined portion above the upper end of the first joint, and also greater than the curvature of the inner wall surface of the hanging portion below the lower end of the first joint, and the second curvature of the second curved surface is set to be greater than the curvature of the inner wall surface of the rearward inclined portion above the upper end of the second joint, and the second joint A flush toilet characterized in that the curvature of the inner wall surface of the hanging portion below the lower end of the part is set to be greater than the curvature of the inner wall surface of the hanging portion below the lower end of the part, the first curvature of the first curved surface is set to be greater than the second curvature of the second curved surface, the entire vertical portion from the lower end to the upper end of the second joint is located within the range of vertical height positions from the lower end to the upper end of the first joint, and the upper end of the first joint is set to be lower than the height position of the entrance of the drain trap part and higher than the upper end of the second joint.

2. The flush toilet according to claim 1, wherein the rearward inclined portion is set such that, in a central side cross-sectional view, its inclination angle with respect to the horizontal plane is greater than the inclination angle of the front inclined portion.

3. The above-mentioned hanging portion is provided with a hanging inlet that is joined to the first joint and the second joint, and the above-mentioned hanging inlet is set such that, in a plan view, the cross-sectional area of ​​the flow path on the front side of the central axis in the front-rear direction of the flow path cross-section is larger than the cross-sectional area of ​​the flow path on the rear side of the central axis.

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