Water-washed toilet

Abstract

To provide a water closet which can prevent dirt from attaching to the inside of a bowl part (especially a pot part) even if the whole water reserving area in a water storage part is largely secured to some extent so as to improve both washing performance and dirt discharge performance.SOLUTION: A water closet 1 has a bowl part 8 including a pot part 12, and a drain trap part 8. The pot part comprises a bottom wall 32 formed at the upper side and the front side of an entrance in the drain trap part, side walls 36 and 38 formed so as to surround the periphery of the bottom wall, and a joint part 40 for joining an outer edge 32b in the bottom wall to lower edges 36b and 38b in the side walls. The bottom wall in the pot part comprises an inclined part 44 and a guide part 46 formed in right and left outer sides of the inclined part and for guiding washing water or dirt from the front side toward the entrance in the drain trap part. The inclined part is formed so as to be inclined downward from the front side toward the entrance in the drain trap part while the whole is formed in an upwardly projecting shape, in a side cross-sectional view.SELECTED DRAWING: Figure 3A

Description

[Technical Field]

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that is flushed with flush water to expel waste. [Background technology]

[0002] Conventionally, flush toilets that are cleaned with flushing water to expel waste have been known, such as those described in Patent Document 1, in which the toilet body comprises a bowl portion and a drain trap portion whose inlet is connected below the bowl portion. Furthermore, in such conventional flush toilets, the bowl portion of the toilet body is equipped with a bowl-shaped waste receiving surface and a basin portion provided below this waste receiving surface. Furthermore, the urn portion forms a water reservoir portion above the drain trap portion for storing a predetermined amount of water. The bottom surface of the urn portion forming the water reservoir portion forms a flat surface that slopes downward toward the inlet of the drain trap portion. As a result, when the cleaning water that flows into the basin from the waste receiving surface comes into contact with the flat bottom surface of the basin, it forms a flow that swirls vertically in the water storage section (hereinafter referred to as "vertical swirling flow"), and guides the cleaning water in the basin to the inlet of the drain trap section. In particular, in the case of so-called "wash-down flush toilets," in which waste is washed away by the flowing water caused by the difference in water level within the bowl, the vertical swirling flow within the basin acts on waste that has spread around the entrance to the drain trap, and the water pressure from above caused by the flush water discharged from the rim of the bowl is also applied, which has a significant effect of pushing waste into the drain trap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-67954 Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional flushing toilet described in Patent Document 1 mentioned above, in the water storage part of the pot part of the toilet body, in order to form a vertical swirling flow, it is necessary to design the size of the water storage area (such as the planar cross-sectional area of the water storage area) to be relatively small. However, if the size of the water storage area of the water storage part is designed to be smaller than before, the surface area of the dirt receiving surface of the bowl part and the area other than the water storage part in the pot part will increase accordingly, so there is a problem that the area where dirt adheres also increases. On the other hand, if the size of the water storage area of the water storage part is designed to be larger than before, the flow of the washing water in the water storage part will be difficult to gather on the central side of the water storage part, so it will be difficult to collect dirt. As a result, the area where dirt scatters and floats in the water storage part also increases, so a gap is generated between the dirt and the drain trap part, so that the water pressure of the washing water does not effectively act on the dirt, that is, a so-called "pressure loss phenomenon" occurs, leading to a problem of deterioration of the dirt discharge performance.

[0005] Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and even if a certain size of the entire water storage area of the water storage part is ensured, it is possible to suppress dirt from adhering in the bowl part (especially the pot part), and an object of the present invention is to provide a flushing toilet that can improve both the cleaning performance and the dirt discharge performance.

Means for Solving the Problems

[0006] In order to solve the above-mentioned problems, the present invention is a flushing toilet that is washed with washing water to discharge dirt, A bowl part comprising a bowl-shaped dirt receiving surface, a rim part formed above the dirt receiving surface, and a pot part provided below the dirt receiving surface and forming a water storage part by the stored standing water; a water spraying part provided on the rim part and spraying washing water toward the inside of the bowl part; and a drain trap part having an inlet connected to the lower part of the pot part and discharging the dirt in the bowl part. The pot part includes a bottom wall formed above and in front of the inlet of the drain trap part, a side wall formed so as to surround the periphery of the bottom wall, and a joint part joining the outer edge of the bottom wall and the lower edge of the side wall with a surface having a curvature. The bottom wall of the pot part includes an inclined part formed across the left and right with respect to the left and right central axis thereof, and a guide part formed on the left and right outer sides of the inclined part and guiding washing water or dirt from the front toward the inlet of the drain trap part. The inclined part is formed so as to be convex upward as a whole and inclined downward from the front toward the inlet of the drain trap part in a side cross-sectional view. In the present invention configured as described above, the washing water sprayed into the bowl part from the water spraying part flows from the dirt receiving surface into the pot part. At this time, the washing water or dirt in the pot part is guided by the guide part formed on the left and right outer sides of the inclined part of the bottom wall of the pot part so as to be collected in the inclined part on the left and right central sides thereof, and then guided toward the inlet of the drain trap part. Further, since the inclined part of the bottom wall of the pot part is formed so as to be convex upward as a whole and inclined downward from the front toward the inlet of the drain trap part in a side cross-sectional view, a part of the washing water flowing along the inclined part can be peeled off. Thereby, the water pressure of the washing water containing the dirt collected in the inclined part of the bottom wall of the pot part can be increased, and the washing water and dirt can be guided to the central side of the inlet of the drain trap part. Therefore, at the inlet of the drain trap part, the pushing force of the washing water containing the dirt can be increased, so that the dirt discharge performance can be improved.

[0007] In the present invention, preferably, in a front cross-sectional view, the guide portion is formed in a convex shape upward, while the inclined portion is formed in a concave shape downward from the lower ends on the left and right inner sides of the guide portion. In the present invention configured as described above, in a front cross-sectional view of the bottom wall of the kettle portion, since the guide portion is formed in a convex shape upward while the inclined portion is formed in a concave shape downward from the lower ends on the left and right inner sides of the guide portion, the washing water that has overcome the convex guide portion and flowed into the concave inclined portion is suppressed from flowing out again to the outside of the inclined portion by the convex portions on the left and right outer sides of the inclined portion. Thereby, while maintaining the state in which the washing water is held in the concave inclined portion, the washing water and dirt can be guided from the inlet of the drain trap portion to the central side of the flow path cross-section in the drain trap portion. Therefore, the water pressure of the washing water containing dirt collected in the inclined portion of the bottom wall of the kettle portion can be increased, and the dirt discharge performance can be enhanced.

[0008] In the present invention, preferably, in a front cross-sectional view, the amount of depression in the vertical direction from the upper end to the lowest bottom surface of the inclined portion is set to increase as it goes toward the inlet side of the rear drain trap portion. In the present invention configured as described above, in a front cross-sectional view of the inclined portion of the bottom wall of the kettle portion, since the amount of depression in the vertical direction from the upper end to the lowest bottom surface of this inclined portion is set to increase as it goes toward the inlet side of the rear drain trap portion, it is possible to suppress the washing water in the inclined portion from overcoming the convex guide portions on the left and right outer sides immediately before flowing into the inlet of the drain trap portion. Thereby, the water pressure of the washing water flowing into the inlet of the drain trap portion can be increased, and the washing water and dirt can be effectively guided from the inlet of the drain trap portion to the central side of the flow path cross-section in the drain trap portion, so that the dirt discharge performance for discharging dirt can be enhanced.

[0009] In the present invention, preferably, in a plan view, the width of the inclined portion in the left-right direction is set to increase as it goes toward the inlet side of the rear drain trap portion. In the present invention formed in this way, in a plan view of the inclined portion of the bottom wall of the pot portion, the width in the left-right direction is set to increase toward the inlet side of the rear drain trap portion. Therefore, when the washing water flows from the inclined portion into the inlet of the drain trap portion, the washing water and dirt can be guided to a wide range of the inlet of the drain trap portion and then guided to the central side of the flow path cross section in the drain trap portion. Therefore, the water pressure of the washing water when discharging dirt from the pot portion into the drain trap portion can be increased, and the dirt discharge performance can be improved.

[0010] In the present invention, preferably, the bottom wall of the pot portion further includes a rear bottom surface portion that protrudes forward from the rear side of the water storage portion, and this rear bottom surface portion is configured to guide the washing water on the rear side in the pot portion to the front side. In the present invention formed in this way, in addition to the washing water flowing from the front side in the pot portion into the inlet of the drain trap portion, the rear bottom surface portion that protrudes forward from the rear side of the water storage portion of the bottom wall of the pot portion guides the washing water on the rear side in the pot portion to the front side (the inlet side of the drain trap portion), and the washing water can also flow into the inlet of the drain trap portion from the rear side. Thereby, the water pressure of the entire washing water flowing into the inlet of the drain trap portion can be increased, and the dirt discharge performance can be improved.

[0011] In the present invention, preferably, in a side cross-sectional view, the apex of the portion formed convex upward of the inclined portion is located within the range of the height position between the upper end and the lower end of the rear bottom surface portion. In the present invention formed in this way, in a side cross-sectional view of the inclined portion of the bottom wall of the pot portion, since the apex of the portion formed convex upward thereof is located within the range of the height position between the upper end and the lower end of the rear bottom surface portion, the position where the washing water peels off from the inclined portion can be set above the inlet of the drain trap portion. Thereby, the washing water and dirt immediately before flowing into the inlet of the drain trap portion can be concentrated on the central side to increase the water pressure, so that the dirt discharge performance can be improved.

[0012] In the present invention, preferably, in a side cross-sectional view, the inclined portion is formed of a surface having a curvature in a portion convex upward, and the whole is formed to incline downward from the front region of the water reservoir portion to the inlet of the drain trap portion. In the present invention formed in this way, in a side cross-sectional view of the inclined portion of the bottom wall of the pot portion, the portion formed convex upward has a surface having a curvature, and the whole is formed to incline downward from the front region of the water reservoir portion to the inlet of the drain trap portion. As a result, in the front region of the water reservoir portion, the angle at which the bottom wall of the pot portion faces downward becomes smaller than that in the rear region of the water reservoir portion, and the shape becomes closer to being flat. Thereby, in the front region of the water reservoir portion, it is easy to cause the washing water to collide with the bottom wall and change the direction, and a vertical swirling flow is promoted. On the other hand, in the rear region of the water reservoir portion, the angle at which the bottom wall of the pot portion faces downward becomes larger than that in the front region of the water reservoir portion. Thereby, in the rear region of the water reservoir portion, the washing water and the dirt can be guided to the inlet of the drain trap portion behind the inclined portion without being directed toward the front region. In addition, in the pot portion, the dirt can be easily agitated by vertical swirling, and the water pressure of the washing water flowing into the inlet of the drain trap can be increased, so that the dirt discharge performance can be improved.

Advantages of the Invention

[0013] According to the flushing toilet of the present invention, even if a certain size of the water reservoir area of the water reservoir portion is ensured, it is possible to suppress the adhesion of dirt in the bowl portion (particularly, the pot portion), and improve both the washing performance and the dirt discharge performance.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9

Figure 10

Best Mode for Carrying Out the Invention

[0015] Hereinafter, with reference to FIGS. 1 to 10, a flushing toilet according to an embodiment of the present invention will be described. First, FIG. 1 is a schematic plan view of a flushing toilet according to an embodiment of the present invention. Further, FIG. 2 is a side sectional view taken along line II-II of FIG. 1. As shown in FIGS. 1 and 2, a flushing toilet 1 according to an embodiment of the present invention includes a toilet bowl body 2 made of pottery. This toilet bowl body 2 includes a water guide passage 4, a bowl-shaped bowl portion 6, and a drain trap portion 8 from the upstream side to the downstream side. Accordingly, the flushing toilet 1 according to an embodiment of the present invention is in the form of a so-called "washing-down type flushing toilet" that flushes away dirt by the flowing water action due to the water level difference in the bowl portion 6. Note that the flushing toilet 1 according to an embodiment of the present invention is also applicable to a so-called "siphon type flushing toilet" that sucks in dirt in the bowl portion 6 using the siphon action and discharges it to the outside at once from the drain trap portion 8.

[0016] In the flushing toilet 1 of the present embodiment shown in FIGS. 1 and 2, a toilet seat (not shown), a toilet lid (not shown), etc. are provided on the upper surface of the toilet bowl body 2. Since it is the same as the structure of a conventional flushing toilet, a specific description thereof will be omitted. Furthermore, on the rear side of the toilet seat (not shown) and the toilet lid (not shown) on the upper surface of the toilet bowl body 2, functional parts such as a sanitary washing part (not shown) for washing the user's local area and a water supply system functional part (not shown) involved in the water supply function to the toilet bowl body 2 may be provided. However, since these are the same as the structure of a conventional flushing toilet, a specific description thereof will be omitted.

[0017] Next, as shown in FIG. 1, the flushing 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 flushing and supplies water to the toilet bowl body 2. Here, in the present embodiment, the cleaning water source that supplies cleaning 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 cleaning water source that supplies cleaning water to the toilet body 2, a city water direct pressure type that directly utilizes the water supply pressure of city water, a flush valve type, or a form that supplies cleaning water using the pressure boost of a pump may be used.

[0018] 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 defined as the center O of the bowl portion 6 in 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 2. Also, as shown in FIG. 1, for the front, rear, left, and right directions of the flush toilet 1, they are respectively indicated by "front", "rear", "left", and "right".

[0019] Furthermore, as shown in FIGS. 1 and 2, in the flush toilet 1 of the present embodiment, for the region within the bowl portion 6, the region on the front side of the central axis X is defined as the "front region F of the bowl portion 6". Also, in this front region F of the bowl portion 6, the left region L and the right region R with respect to the central axis Y in the horizontal front-rear direction of the bowl portion 6 are respectively defined as the "left front region LF of the bowl portion 6" and the "right front region RF of the bowl portion 6". Similarly, for the region within the bowl portion 6, the region on the rear side of the central axis X is defined as the "rear region B of the bowl portion 6". Also, in this rear region B of the bowl portion 6, the left region L and the right region R with respect to the central axis Y in the horizontal front-rear direction of the bowl portion 6 are respectively defined as the "left rear region LB of the bowl portion 6" and the "right rear region RB of the bowl portion 6".

[0020] Next, as shown in FIG. 1, the water guide passage 4 located on the upstream side of the toilet bowl main body 2 is formed on the rear side of the bowl portion 6 and guides the washing water supplied from the water storage tank 10 to the bowl portion 6. Also, as shown in FIGS. 1 and 2, the bowl portion 6 located on the downstream side of the water guide passage 4 of the toilet bowl main body 2 includes a pot portion 12, a dirt 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 water 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 water outlet 22 is provided on the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6.

[0021] Next, as shown in FIGS. 1 and 2, the water guide passage 4 includes a common water guide passage 24, a first rim water guide passage 26, and a second rim water guide passage 28. First, the common water guide passage 24 is formed inside the toilet bowl main body 2 on the rear side of the bowl portion 6 so as to extend from the rear inlet 4a connected to the water storage tank 10 to the vicinity of the back side of the front bowl portion 6. Also, the first rim water guide passage 26 branches from the common water guide passage 24 to the left side of the bowl portion 6 near the back side of the bowl portion 6, and then extends to the first rim water outlet 20 on the front side while bypassing the outer peripheral surface of the bowl portion 6, and is formed inside the rim portion 18 in the left front region LF of the bowl portion 6. Thereby, the washing water supplied from the common water guide passage 24 to the first rim water guide passage 26 is discharged forward as the first rim water discharge from the first rim water outlet 20 toward the shelf portion 16 on the front side thereof, and then forms a swirling flow that swirls from the left front region LF in the bowl portion 6 through the right front region RF to the right rear region RB.

[0022] Furthermore, the second rim water guide passage 28 branches from the common water guide passage 24 to the right side of the bowl portion 6 near the back side of the bowl portion 6, then bends (U-turns) toward the left-side second rim water outlet 22 near the right-side portion of the toilet bowl main body 2, and extends to the second rim water outlet 22, and is formed inside the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6. As a result, the washing water supplied from the common water channel 24 to the second rim water channel 28 is discharged rearward as the second rim water discharge from the second rim water discharge port 22 toward the shelf portion 16 on the rear side thereof, and then swirls from the right rear region RB in the bowl portion 6 through the left rear region LB to the left front region LF, and then flows from this left front region LF into the front region in the kettle portion 12. In addition, a part of the second rim water discharge discharged from the second rim water discharge port 22 also flows from the dirt receiving surface 14 in the region behind the kettle portion 12 of the bowl portion 6 into the rear region in the kettle portion 12. In addition, in the present embodiment, a form in which the shelf portion 16 of the bowl portion 6 is provided between the outer edge of the dirt receiving surface 14 and the lower end of the rim portion 18 will be described. However, it is not always necessary to provide the shelf portion 16. The shelf portion 16 can be omitted, and the first rim water discharge and the second rim water discharge discharged from the first rim water discharge port 20 and the second rim water discharge port 22 respectively may be directly discharged to the upper edge portion of the dirt receiving surface 14 without passing through the shelf portion 16.

[0023] Next, with reference to FIGS. 1 to 8B, the kettle portion 12 of the bowl portion 6 and details of its peripheral portion will be described. First, FIG. 3A is an enlarged side cross-sectional view of the kettle portion of the toilet body, which is an enlarged side cross-sectional view of the side cross-sectional view of the water-washing toilet according to an embodiment of the present invention shown in FIG. 2. FIG. 3B is an enlarged side cross-sectional view of the front portion of the kettle portion of the toilet body of the water-washing toilet according to an embodiment of the present invention shown in FIG. 3A. Next, FIG. 4 is a partially enlarged plan view of the kettle portion of the toilet body of the water-washing toilet according to an embodiment of the present invention. In addition, FIG. 5A is a cross-sectional view taken along line VA-VA of FIG. 1, and FIG. 5B is a cross-sectional view of the lower portion of the kettle portion of the bowl portion of the toilet body of the water-washing toilet according to an embodiment of the present invention shown in FIG. 5A, which is an enlarged cross-sectional view. Furthermore, FIG. 6A is a cross-sectional view taken along line VIA-VIA of FIG. 1, and FIG. 6B is a cross-sectional view of the lower portion of the kettle portion of the bowl portion of the toilet body of the water-washing toilet according to an embodiment of the present invention shown in FIG. 6A, which is an enlarged cross-sectional view. Further, FIG. 7A is a cross-sectional view taken along line VIIA-VIIA of FIG. 1, and FIG. 7B is an enlarged cross-sectional view of the lower part of the pot part of the bowl part in the toilet body of the flushing toilet according to an embodiment of the present invention shown in FIG. 7A. Furthermore, FIG. 8A is a cross-sectional view taken along line VIIIA-VIIIA of FIG. 1, and FIG. 8B is an enlarged cross-sectional view of the lower part of the pot part of the bowl part in the toilet body of the flushing toilet according to an embodiment of the present invention shown in FIG. 8A.

[0024] First, as shown in FIGS. 2 and 3A, the pot part 12 of the bowl part 6 is provided below the dirt receiving surface 14, and forms a water storage part W0 by the stored standing water. Here, in FIGS. 2 and 3A, the water level (sealing water level) of the water surface of the water storage part W0 of the pot part 12 of the bowl part 6 in the standby state (sealing water state) before toilet flushing is indicated by the symbol "WL". Next, as shown in FIGS. 3A to 8B, the pot part 12 is provided above and in front of the inlet 30 of the drain trap part 8 and includes a bottom wall 32 that forms the bottom surface 32a of the pot part 12. The pot part 12 also includes a rear wall 34 provided on the rear side of the inlet 30 of the drain trap part 8. Furthermore, the pot part 12 includes side walls 36, 38 (left side wall 36, right side wall 38) provided forward from both left and right ends of the rear wall 34. In addition, each of the left and right side walls 36, 38 of the pot part 12 is formed to narrow inwardly to the left and right toward the front, and the front ends 36a, 38a thereof are joined to each other.

[0025] Next, as shown in FIGS. 3B, 5B, 6B, 7B, and 8B, the pot part 12 further includes a lower joint part 40 that joins the outer edge 32b of the bottom surface 32a of the bottom wall 32 and the lower edges 36b, 38b of the side walls 36, 38 with a surface having a curvature (curved surface C1). Further, in the side cross-sectional view of FIG. 3B and the front cross-sectional views of FIGS. 5B, 6B, 7B, and 8B, the curvature of the curved surface C1 in the section between the lower edge 40a and the upper edge 40b of the lower joint portion 40 is set to be larger than the curvature of the tangent plane C2 including the bottom surface 32a at the lower joint point P1 that joins the lower edge 40a of the lower joint portion 40 (the lower edge 40a of the curved surface C1) and the outer edge 32b of the bottom surface 32a of the bottom wall 32. Similarly, in the side cross-sectional view of FIG. 3B and the front cross-sectional views of FIGS. 5B, 6B, 7B, and 8B, the curvature of the curved surface C1 of the lower joint portion 40 is set to be larger than the curvature of the tangent plane C3 including the wall surfaces of the side walls 36 and 38 at the upper joint point P2 that joins the upper edge 40b of the lower joint portion 40 (the upper edge 40b of the curved surface C1) and the lower edges 36b and 38b of the side walls 36 and 38.

[0026] Next, as shown in FIGS. 3B, 5A, 6A, 7A, and 8A, the kettle portion 12 further includes an upper joint portion 42 that joins the upper edges 36c and 38c of its side walls 36 and 38 and the lower edge 14a of the dirt receiving surface 14 with a surface having a curvature (curved surface C4). Further, in the side cross-sectional views of FIGS. 3A and 3B and the front cross-sectional views of FIGS. 5B, 6B, 7B, and 8B, the curvature of the curved surface C4 in the section between the lower edge 42a and the upper edge 42b of the upper joint portion 42 is set to be larger than the curvature of the tangent plane C5 including the wall surfaces of the side walls 36 and 38 at the lower joint point P3 that joins the lower edge 42a of the upper joint portion 42 (the lower edge 42a of the curved surface C4) and the upper edges 36c and 38c of the side walls 36 and 38. Similarly, in the side cross-sectional views of FIGS. 3A and 3B and the front cross-sectional views of FIGS. 5B, 6B, 7B, and 8B, the curvature of the curved surface C4 of the upper joint portion 42 is set to be larger than the curvature of the tangent plane C6 including the wall surface of the dirt receiving surface 14 at the upper joint point P4 that joins the upper edge 42b of the upper joint portion 42 (the upper edge 42b of the curved surface C4) and the lower edge 14a of the dirt receiving surface 14.

[0027] Here, in the flushing toilet 1 of the present embodiment shown in FIGS. 2 to 4, the boundary line between the bottom wall 32 of the pot portion 12 and the lower joint portion 40, which corresponds to the outer edge 32b of the bottom wall 32 of the pot portion 12 and the lower edge 40a of the lower joint portion 40, is indicated by the symbol "L1". Also, the boundary line between the lower joint portion 40 of the pot portion 12 and the side walls 36, 38, which corresponds to the upper edge 40b of the lower joint portion 40 of the pot portion 12 and the lower edges 36b, 38b of the side walls 36, 38, is indicated by the symbol "L2". Furthermore, the boundary line between the side walls 36, 38 of the pot portion 12 and the upper joint portion 42, which corresponds to the upper edges 36c, 38c of the side walls 36, 38 of the pot portion 12 and the lower edge 42a of the upper joint portion 42, is indicated by the symbol "L3". Also, the boundary line between the upper joint portion 42 of the pot portion 12 and the dirt receiving surface 14, which corresponds to the upper edge 42b of the upper joint portion 42 of the pot portion 12 and the lower edge 14a of the dirt receiving surface 14, is indicated by the symbol "L4".

[0028] Next, as shown in FIGS. 4, 5B, 6B, 7B, and 8B, the bottom wall 32 of the pot portion 12 is provided with a concave inclined portion 44 formed to be concave downward across the left and right with respect to the left and right central axis Z in a front cross-sectional view. Also, as shown in FIGS. 4, 5B, 6B, 7B, and 8B, the bottom wall 32 of the pot portion 12 is provided with a guide portion 46 formed on the left and right outer sides of the inclined portion 44 and guiding washing water or dirt from the front toward the inlet 30 of the drain trap portion 8. Furthermore, as shown in FIGS. 5B, 6B, 7B, and 8B, the guide portion 46 is provided in a region between the lower joint portion 40 and the left and right inner inclined portions 44 on the bottom wall 32 of the pot portion 12, and is formed into a convex curved surface C7 that protrudes upward from a planar shape toward the left and right from the lower joint portion 40 side, and then is formed to transition to the concave curved surface C8 of the inclined portion 44.

[0029] Here, in FIGS. 4, 5B, 6B, 7B, and 8B, at the inclined portion 44 and the guide portion 46 of the bottom wall 32 of the pot portion 12, the point (inflection point) where it bends from the curved surface C7 of the convex guide portion 46 on the left and right outer sides to the curved surface C8 of the concave inclined portion 44 on the left and right inner sides is indicated by the symbol "P5". This inflection point P5 also serves as the joining point between the lower ends on the left and right inner sides of the guide portion 46 and the upper ends on the left and right outer sides of the inclined portion 44. Further, as shown in FIG. 4, in the plan view of the inclined portion 44 and the guide portion 46 of the bottom wall 32 of the pot portion 12, the locus connecting the inflection point P5 on the plane, that is, the boundary line between the upper ends on the left and right outer sides of the inclined portion 44 and the lower ends on the left and right inner sides of the guide portion 46 is indicated by the symbol "L5". As a result, the curved surface C7 of the guide portion 46 of the bottom wall 32 of the pot portion 12 described above is formed convex upward in the front cross-sectional view, while the curved surface C8 of the inclined portion 44 is formed concave downward from the lower ends on the left and right inner sides of the guide portion 46 in the front cross-sectional view.

[0030] Next, as shown in FIGS. 5B, 6B, 7B, and 8B, the curved surface C8 of the inclined portion 44 of the bottom wall 32 of the pot portion 12 is set such that the amount of depression d1 in the vertical direction from its upper end (inflection point P5) to the lowest bottom surface position P6 increases as it goes toward the inlet 30 side of the rear drain trap portion 8 in the front cross-sectional view. Further, as shown in FIG. 4, in the plan view of the inclined portion 44 of the bottom wall 32 of the pot portion 12, the width (lateral width M) in the left-right direction is set to increase as it goes toward the inlet 30 side of the rear drain trap portion 8.

[0031] Next, as shown in FIG. 3A, the inclined portion 44 of the bottom wall 32 of the pot portion 12 is formed such that as a whole it is convex upward in the side cross-sectional view and is inclined downward from the front toward the inlet 30 of the drain trap portion 8. Also, as shown in FIG. 3A, the inclined portion 44 is formed with a surface having a curvature (curved surface C8) in the part that is convex upward in the side cross-sectional view. The entire curved surface C8 is formed to incline downward from the front region of the water storage portion W0 to the inlet 30 of the drain trap portion 8.

[0032] Next, as shown in FIG. 3A, the bottom wall 32 of the pot portion 12 further includes a rear bottom surface portion 48 that protrudes forward from the rear side of the water storage portion W0. More specifically, this rear bottom surface portion 48 is provided so as to protrude forward at the lower end of the rear wall 34 of the pot portion 12 so as to guide the washing water on the rear side in the pot portion 12 to the front side, and is provided above and in front of the rear end of the inlet 30 of the drain trap portion 8. Also, as shown in FIG. 3A, in a side cross-sectional view of the inclined portion 44 of the bottom wall 32 of the pot portion 12, the apex Q1 of the upwardly convex portion (curved surface C8) formed above it is within the height range (vertical width H1) between the upper end position Q2 and the lower end position Q3 of the surface forming the rear bottom surface portion 48. Thereby, the location where the washing water on the inclined portion 44 peels off from the inclined portion 44, that is, the apex Q1 of the upwardly convex portion (curved surface C8) in the side cross-sectional view of the inclined portion 44 can be set at a position above the inlet 30 of the drain trap portion 8.

[0033] Next, with reference to FIGS. 1 to 10, the flow of the washing water in the bowl portion 6 during toilet washing in the flushing toilet 1 according to an embodiment of the present invention will be described. FIG. 9 is a schematic plan view schematically illustrating the flow of the washing water that has been discharged from the second rim water outlet in the bowl portion of the flushing toilet according to an embodiment of the present invention, swirled from the rear side to the front side of the bowl portion, and then flowed into the pot portion from the front side. Also, FIG. 10 is a schematic side cross-sectional view schematically illustrating the flow of the washing water that has been discharged from each of the first rim water outlet and the second rim water outlet in the bowl portion of the flushing toilet according to an embodiment of the present invention and has flowed into the front region in the pot portion. First, as shown in FIG. 9, in the flushing toilet 1 of the present embodiment, when toilet washing is started, the washing water W in the water storage tank 10 is supplied from the inlet 4a of the water guide path 4 of the toilet main body 2 to the common water guide path 24. The washing water W in this common water guide path 24 branches into the first rim water guide path 26 and the second rim water guide path 28 as the first washing water W1 and the second washing water W2, respectively.

[0034] Next, as shown in FIGS. 9 and 10, the first washing water W1 in the first rim water channel 26 is discharged forward as the first rim water discharge W1 from the downstream first rim water discharge port 20. This first rim water discharge W1 forms a swirling flow f1 that swirls from the left front region LF in the bowl portion 6 through the right front region RF to the right rear region RB. On the other hand, as shown in FIGS. 9 and 10, the second washing water W2 in the second rim water channel 28 is discharged as the second rim water discharge W2 from the second rim water discharge port 22. This second rim water discharge W2 forms a flow f2 that swirls from the right rear region RB in the bowl portion 6 through the left rear region LB to the left front region LF and then flows into the front region in the pot portion 12 from this left front region LF. Also, a part of the second rim water discharge W2 discharged from the second rim water discharge port 22 flows into the rear region in the pot portion 12 from the dirt receiving surface 14 in the region behind the pot portion 12 of the bowl portion 6.

[0035] Next, as shown in FIGS. 9 and 10, in the washing water W3 that has flowed into the pot portion 12, by being collected on the inclined portion 44 side (the left - right center side) of the bottom wall 32 of the pot portion 12, a flow f3 of the washing water converging from the bottom wall 32 of the pot portion 12 toward the inlet 30 of the drain trap portion 8 is formed, forming a flow that strongly pushes the dirt into the drain trap portion 8. Also, among the washing water W3 guided below the pot portion 12, a part of the washing water guided laterally downward into the front region of the pot portion 12 collides with the bottom surface 44a (curved surface C8) of the inclined portion 44 and bounces upward and forward, etc., thereby forming a vertically swirling flow (hereinafter referred to as "vertical swirling flow f4"). Thereby, the dirt in the pot portion 12 is stirred together with the accumulated water in the water accumulation portion W0 by the vertical swirling flow f4 of the washing water W3 that has flowed into the pot portion 12, and then is discharged into the drain trap portion 8 from the inlet 30 of the drain trap portion 8.

[0036] According to the flushing toilet 1 with water washing according to one embodiment of the present invention described above, the washing waters W1 and W2 discharged into the bowl portion 6 from the first rim water discharge port 20 and the second rim water discharge port 22 respectively flow into the pot portion 12 from the dirt receiving surface 14. At this time, the washing water W3 or dirt in the pot part 12 is guided by the guide part 46 formed on the left and right outer sides of the inclined part 44 of the bottom wall 32 of the pot part 12 so as to be collected on the inclined part 44 on the left and right central sides thereof, and then guided toward the inlet 30 of the drain trap part 8. Further, since the inclined part 44 of the bottom wall 32 of the pot part 12 is formed so as to be convex upward as a whole and inclined downward from the front toward the inlet 30 of the drain trap part 8 in the side cross-sectional view shown in FIG. 3, a part of the washing water W3 flowing along the inclined part 44 can be peeled off near the apex Q1 of the curved surface C8 of the inclined part 44. Thereby, the water pressure of the washing water W3 containing the dirt collected on the inclined part 44 of the bottom wall 32 of the pot part 12 can be increased, and the washing water W3 and the dirt can be guided to the central side of the inlet 30 of the drain trap part 8. Therefore, at the inlet 30 of the drain trap part 8, the pushing force of the washing water containing the dirt can be increased, so that the dirt discharge performance can be improved.

[0037] Further, according to the flushing toilet 1 according to the present embodiment, as shown in FIGS. 5B, 6B, 7B, and 8B, in the front cross-sectional view of the bottom wall 32 of the pot part 12, the curved surface C7 of the guide part 46 is formed convex upward, while the curved surface C8 of the inclined part 44 is formed concave downward from the lower ends (inflection points P5) on the left and right inner sides of the guide part 46. Thereby, the washing water W3 that has flowed over the convex guide part 46 and into the concave inclined part 44 is suppressed from flowing out again to the outside of the inclined part 44 by the convex portions on the left and right outer sides of the inclined part 44. Thereby, while maintaining the state in which the washing water W3 is held in the concave inclined part 44, the washing water W3 and the dirt can be guided from the inlet 30 of the drain trap part 8 to the central side of the flow path cross-section in the drain trap part 8. Therefore, the water pressure of the washing water containing the dirt collected on the inclined part 44 of the bottom wall 32 of the pot part 12 can be increased to improve the dirt discharge performance.

[0038] Furthermore, according to the flush toilet 1 of the present embodiment, as shown in FIGS. 5B, 6B, 7B, and 8B, in the front cross-sectional view of the inclined portion 44 of the bottom wall 32 of the pot portion 12, the vertical recess amount d1 from the upper end (inflection point P5) to the lowest bottom surface position P6 on the curved surface C8 of the inclined portion 44 is set to increase as it goes toward the inlet 30 side of the rear drainage trap portion 8. Thereby, it is possible to suppress the cleaning water W3 in the inclined portion 44 from getting over the convex guide portions 46 on the left and right outer sides of the inclined portion 44 immediately before flowing into the inlet 30 of the drainage trap portion 8. Therefore, since the water pressure of the cleaning water W3 flowing into the inlet 30 of the drainage trap portion 8 can be increased and the cleaning water W3 and the dirt can be effectively guided from the inlet 30 of the drainage trap portion 8 to the central side of the flow path cross section in the drainage trap portion 8, the dirt discharge performance for discharging the dirt can be enhanced.

[0039] Also, according to the flush toilet 1 of the present embodiment, as shown in FIG. 4, in the plan view of the inclined portion 44 of the bottom wall 32 of the pot portion 12, the width (lateral width M) in the left-right direction is set to increase as it goes toward the inlet 30 side of the rear drainage trap portion 8. Thereby, when the cleaning water flows from the inclined portion 44 into the inlet 30 of the drainage trap portion 8, after guiding the cleaning water W3 and the dirt to a wide range of the inlet 30 of the drainage trap portion 8, it can be guided to the central side of the flow path cross section in the drainage trap portion 8. Therefore, the water pressure of the cleaning water W3 when discharging the dirt from the pot portion 12 into the drainage trap portion 8 can be increased, and the dirt discharge performance can be enhanced.

[0040] Furthermore, according to the flush toilet 1 of the present embodiment, in addition to the cleaning water W3 flowing from the front side in the pot portion 12 into the inlet 30 of the drainage trap portion 8, the rear bottom surface portion 48 protruding forward from the rear side of the water storage portion W0 of the bottom wall 32 of the pot portion 12 guides the cleaning water W3 on the rear side in the pot portion 12 to the front side (the inlet 30 side of the drainage trap portion 8), and the cleaning water can also flow into the inlet 30 of the drainage trap portion 8 from the rear side. This can increase the water pressure of the entire cleaning water W3 flowing into the inlet 30 of the drain trap portion 8, thereby enhancing the dirt discharge performance.

[0041] Further, according to the flushing toilet 1 of the present embodiment, as shown in FIG. 3A, in a side cross-sectional view of the inclined portion 44 of the bottom wall 32 of the pot portion 12, the vertex Q1 of the portion (curved surface C8) formed in a convex shape above it is located within the range (vertical width H1) of the height positions between the upper end position Q2 and the lower end position Q3 of the surface forming the rear bottom surface portion 48. This enables setting the location where the cleaning water W3 peels off from the inclined portion 44, that is, the vertex Q1 of the portion formed in a convex shape above the inclined portion 44 in a side cross-sectional view, at a position above the inlet 30 of the drain trap portion 8. As a result, the cleaning water W3 and dirt immediately before flowing into the inlet 30 of the drain trap portion 8 can be concentrated toward the center side, increasing the water pressure, and thus enhancing the dirt discharge performance.

[0042] Furthermore, according to the flushing toilet 1 of the present embodiment, as shown in FIG. 3A, in a side cross-sectional view of the inclined portion 44 of the bottom wall 32 of the pot portion 12, the portion (bottom surface 44a) formed in a convex shape above it is a surface (curved surface C8) having a curvature, and the whole is formed to incline downward from the front region of the water storage portion W0 to the inlet 30 of the drain trap portion 8. As a result, in the front region of the water storage portion W0, the angle at which the bottom wall 32 of the pot portion 12 faces downward becomes smaller compared to the rear region of the water storage portion W0, and the shape becomes closer to being flat. Therefore, in the front region of the water storage portion W0, it is easy to make the cleaning water W3 collide with the bottom wall 32 and change its direction, promoting the longitudinal swirling flow f4. On the other hand, in the rear region of the water storage portion W0, the angle at which the bottom wall 32 of the pot portion 12 faces downward becomes larger compared to the front region of the water storage portion W0. This enables guiding the cleaning water and dirt to the inlet 30 of the drain trap portion 8 behind the inclined portion 44 without directing them toward the front region in the rear region of the water storage portion W0. In addition, within the pot section 12, it is possible to easily stir the dirt by vertical rotation, and since the water pressure of the washing water W3 flowing into the inlet 30 of the drain trap section 8 can be increased, the dirt discharge performance can be enhanced.

Explanation of Signs

[0043] 1 Flush toilet 2 Toilet body 4 Water conduit 4a Inlet of the water conduit 6 Bowl section 8 Drain trap section 10 Water storage tank 12 Pot section 14 Dirt receiving surface 14a Lower edge of the dirt receiving surface 16 Shelf section 18 Rim section 20 First rim water outlet (water discharge section) 22 Second rim water outlet (water discharge section) 24 Common water conduit 26 First rim water conduit 28 Second rim water conduit 30 Inlet of the drain trap section 32 Bottom wall of the pot section 32a Bottom surface of the bottom wall of the pot section 32b Outer edge of the bottom wall of the pot section 34 Rear wall of the pot section 36 Left side wall of the pot section (side wall of the pot section) 36a Front end of the left side wall of the pot section 36b Lower edge of the left side wall of the pot section (lower edge of the side wall of the pot section) 36c Upper edge of the left side wall of the pot section 38 Right side wall of the pot section (side wall of the pot section) 38a Front end of the right side wall of the pot section 38b Lower edge of the right side wall of the pot section (lower edge of the side wall of the pot section) 38c Upper edge of the right side wall of the pot section 40 Lower joint (joint of the pot section) 40a Lower edge of the lower joint 40b Upper edge of the lower joint 42 Upper joint 42a Lower edge, inner edge of the upper joint Upper edge of the upper joint of 42b Inclined portion of the bottom wall of the pot portion 44 Bottom surface of the inclined portion 44a Rear end of the inclined portion 44b Guide portion of the bottom wall of the pot portion 46 Rear bottom surface portion of the bottom wall of the pot portion 48 Rear region of the bowl portion B Bending surface of the lower joint C1 (surface having the curvature of the joint) Contact plane C2 Contact plane C3 Bending surface of the upper joint C4 (surface having the curvature of the joint) Contact plane C5 Contact plane C6 Curved surface of the guide portion C7 Curved surface of the inclined portion C8 Vertical recess amount from the upper end of the inclined portion of the pot portion (lower end of the guide portion) to the lowest bottom surface position of the inclined portion d1 Front region of the bowl portion F Flow of washing water f1 Flow of washing water f2 Flow of washing water f3 Flow of washing water f4 (vertical swirling flow) Vertical width between the upper end position and the lower end position of the surface forming the rear bottom surface portion H1 Left region of the bowl portion L Left rear region of the bowl portion LB Left front region of the bowl portion LF Boundary line between the bottom wall of the pot portion and the lower joint L1 Boundary line between the lower joint and the side wall of the pot portion L2 Boundary line between the side wall and the upper joint of the pot portion L3 Boundary line between the upper joint of the pot portion and the dirt receiving surface L4 Boundary line between the left and right outer upper ends of the inclined portion of the bottom wall of the pot portion and the left and right inner lower ends of the guide portion L5 Lateral width of the inclined portion of the bottom wall of the pot portion M Center of the bowl portion O, center in the front - rear direction of the pot portion Lower joint point P1 that joins the lower edge of the lower joint and the outer edge of the bottom surface of the bottom wall Upper joint point P2 that joins the upper edge of the lower joint and the lower edge of the side wall Lower joining point that joins the lower edge of the upper joining part of P3 and the upper edge of the side wall Upper joining point that joins the upper edge of the upper joining part of P4 and the lower edge of the dirt receiving surface P5 Lower ends on the left and right inner sides of the guide part, upper ends on the left and right outer sides of the inclined part, point where the shape bends from the convex guide part to the concave inclined part P6 Lowest bottom surface position of the inclined part of the bottom wall of the kettle part Q1 Vertex of the convexly formed part in the upward direction in the side cross-sectional view of the inclined part of the bottom wall of the kettle part Q2 Upper end position of the surface forming the rear bottom surface part of the bottom wall of the kettle part Q3 Lower end position of the surface forming the rear bottom surface part of the bottom wall of the kettle part R Right side region of the bowl part RB Right rear region of the bowl part RF Right front region of the bowl part W Washing water W0 Water storage part W1 First washing water, first rim water discharge Wc2 Second washing water, second rim water discharge W3 Washing water inside the kettle part WL Water sealing level X Central axis in the horizontal left - right direction of the bowl part Y Central axis in the horizontal front - rear direction of the bowl part Z Vertical central axis passing through the center of the bowl part

Claims

1. A flush toilet that is washed with washing water to discharge dirt, a bowl part including a bowl-shaped dirt receiving surface, a rim part formed above the dirt receiving surface, and a pot part provided below the dirt receiving surface to form a water storage part by the stored standing water, a water discharging part provided on the rim part to discharge washing water toward the inside of the bowl part, a drainage trap part having an inlet connected to the lower part of the pot part to discharge the dirt in the bowl part, the pot part includes a bottom wall formed above and in front of the inlet of the drainage trap part, a side wall formed to surround the periphery of the bottom wall, and a joint part that joins the outer edge of the bottom wall and the lower edge of the side wall with a surface having a curvature, the bottom wall of the pot part includes an inclined part formed across the left and right with respect to the left and right central axis thereof, and a guide part formed on the left and right outer sides of the inclined part to guide washing water or dirt from the front toward the inlet of the drainage trap part, the inclined part is formed such that in a side cross-sectional view, the whole thereof is convex upward and inclined downward from the front toward the inlet of the drainage trap part, the guide part is formed convex upward in a front cross-sectional view, while the inclined part is formed concave downward from the lower ends on the left and right inner sides of the guide part in a front cross-sectional view. A flush toilet characterized by this.

2. The flush toilet according to Claim 1, wherein the inclined part is set such that in a front cross-sectional view, the amount of depression in the vertical direction from the upper end to the lowest bottom surface increases toward the inlet side of the rear drainage trap part.

3. The flush toilet according to Claim 1 or 2, wherein the inclined part is set such that in a plan view, the width in the left and right direction increases toward the inlet side of the rear drainage trap part.

4. The bottom wall of the pot part further includes a rear bottom surface part protruding forward from the rear side of the standing water part, and the rear bottom surface part is configured to guide the washing water on the rear side in the pot part to the front side. The flush toilet according to any one of Claims 1 to 3.

5. The flush toilet according to Claim 4, wherein in a side cross-sectional view, the apex of the part of the inclined part formed convex upward is located within the range of the height position between the upper end and the lower end of the rear bottom surface part.

6. The inclined portion is formed of a surface having a curvature in a portion convex upward in a side cross-sectional view, and is formed so that the whole thereof inclines downward from the front region of the water storage portion to the inlet of the drain trap portion. The flush toilet according to any one of claims 1 to 5.

Images