Flush toilet

Abstract

To provide a flush toilet bowl that can enhance longitudinal agitation performance of filth in a pot part of a toilet bowl body, and can improve dirt discharge performance.SOLUTION: A flush toilet bowl 1 according to the present invention comprises: a bowl part 6 having a dirt receiving surface 14, a rim part 18, and a pot part 12; and a drain trap part 8 for discharging dirt in the bowl part, wherein the pot part 12 has a bottom wall 32, a rear wall 34, a rear side wall 36 provided so as to expand left and right outward toward the front from both left and right ends of the rear wall, and a front side wall 38 provided so as to taper left and right inwards toward the front from both left and right front ends of the rear side wall, and joined at the front ends thereof to each other, the rear side wall is formed so that left and right wall surfaces in a plan view are located inside the pot part as the left and right wall surfaces go from a top to a bottom, and a protruding part 54 protruding forward is provided above a rear edge 30a of an inlet port of the drain trap part in a lower region of the rear wall.SELECTED DRAWING: Figure 3A

Description

Technical Field

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

Background Art

[0002] Conventionally, as a flush toilet that is washed with washing water to discharge dirt, for example, as described in Patent Document 1, a bowl portion of a toilet body includes a bowl-shaped dirt receiving surface and a pot portion that forms a water storage portion with a predetermined amount of stored water provided below the dirt receiving surface. Such a toilet is known. In such a conventional flush toilet, the pot portion of the toilet body includes a rear wall extending in the left-right direction, rear side wall portions provided so as to spread outward to the left and right from both left and right ends of the rear wall toward the front, and front side wall portions provided so as to narrow inward to the left and right from the left and right front ends of the rear side wall portions and having their front ends joined to each other. In a plan view, it generally forms a pentagonal shape. In addition, since such a pot portion generally forms a pentagonal shape in a plan view, a large volume of the rear region of the pot portion can be ensured, so there is an advantage that dirt flowing in together with the washing water from the dirt receiving surface can be easily collected in the pot portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional flush toilet described in Patent Document 1 mentioned above, after the washing water swirling on the dirt receiving surface flows into the pot portion from the front side of the pot portion, the washing water collides with the rear side wall portion of the pot portion and is changed to a flow toward the rear wall. Furthermore, the flow of washing water within such a container tends to create a flow that swirls horizontally, causing the waste to swirl laterally, but it does not easily create a flow that swirls vertically, causing the waste to agitate vertically. This results in a problem of poor waste agitation performance within the container. Therefore, improving the vertical agitation performance of waste within the urinal section and thereby enhancing the waste discharge performance of flush toilets has become a pressing issue in recent years.

[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 improve the vertical stirring performance of waste in the urn of the toilet bowl body and improve waste discharge performance. [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 portion comprising: a bowl-shaped waste receiving surface; a rim portion formed above the waste receiving surface; a pot portion provided below the waste receiving surface and forming a water reservoir portion with the stored water; a water discharge portion provided on the rim portion for discharging flushing water into the bowl portion; and a drain trap portion having an inlet connected to the bottom of the pot portion for discharging waste from the bowl portion, wherein the pot portion has a bottom wall formed above and in front of the inlet of the drain trap portion, and The drain trap comprises a rear wall provided on the rear side of the inlet of the drain trap section, rear side walls provided so as to extend outward to the left and right from both left and right ends toward the front, and front side walls provided so as to narrow inward to the left and right from the left and right front ends of the rear side walls, with their front ends joined together. The rear side wall is formed such that, in a plan view, the left and right wall surfaces are located on the inside of the trap section as they extend from top to bottom, and a projection is provided above the rear end of the inlet of the drain trap section in the lower region of the rear wall, projecting toward the front. In the present invention configured as described above, the washing water discharged from the water outlet into the bowl section flows into the pot section from the waste receiving surface. In this process, the washing water that flows from the waste receiving surface at the top and front of the urn along the front side wall inside the urn to the rear side wall is guided downwards along the left and right walls located inside the urn as it moves from top to bottom in a plan view of the rear side wall. The cleaning water guided downwards into this pot-shaped section then collides from above with a projection located above the rear end of the drain trap inlet in the lower region of the rear wall of the pot-shaped section, causing it to bounce upwards or forwards, thereby changing the overall flow of the cleaning water to an upward direction. As a result, the flow of the washing water forms a vertically swirling flow (hereinafter referred to as "vertical swirling flow"), and the waste in the basin is mixed with the washing water that flows into the basin and the water in the reservoir before being discharged into the drain trap through the entrance of the drain trap. Therefore, it is possible to easily agitate the washing water containing waste and the stagnant water within the urn, thereby improving the waste discharge performance of the flush toilet.

[0007] In the present invention, preferably, the urn portion further has a joint with a curved surface connecting the outer edge of the bottom wall to the lower edges of the rear side wall and the front side wall, and the bottom wall of the urn portion comprises a central bottom surface including the center position of the urn portion in the front-rear direction, and a circumferential bottom surface formed at a position higher than the central bottom surface by joining the periphery of the central bottom surface to the lower edge of the joint, the rear end of which is joined to the protrusion, and in a side cross-sectional view, the circumferential bottom surface is positioned upward from the rear side, which is joined to the protrusion, to the front side. In the present invention configured in this way, of the cleaning water that flows from above into the rear region of the pot, the cleaning water that flows down from above along the rear wall of the pot to the protruding part collides with the protruding part. The washing water that strikes this protrusion is directed forward along the shape of the protruding part, and then guided along the circumferential bottom surface to which the rear end is joined to the protrusion into the front region of the jar. Furthermore, the washing water guided to the front region along the circumferential bottom surface of the pot can form a vertical swirling flow by colliding with the front side wall and then rising along this wall. As a result, the waste-containing washing water and the stagnant water can be effectively mixed within the urinal, thereby further improving the waste discharge performance of the flush toilet.

[0008] In the present invention, preferably, the protrusion is provided over the entire width in the left-right direction at the lower end of the rear wall of the pot portion and the rear end of the inlet of the drain trap portion, and its front end in a plan view is formed in a convex curve toward the rear. In the present invention configured as described above, the washing water discharged from the water outlet into the bowl section flows into the pot section from the waste receiving surface. Of the washing water that flows into this tub, the washing water that flows from the waste receiving surface at the front of the tub along the front side wall inside the tub to the rear side wall, after hitting the wall surface of the rear side wall, is guided downward and towards the rear of the tub along this wall surface, and flows into the lower end of the rear wall of the tub and the rear end of the inlet of the drain trap section. Then, of the cleaning water that flows into the lower end of the rear wall of the pot section and near the rear end of the inlet of the drain trap section, the cleaning water that has a flow vector that is directed downward rather than backward flows into the drain trap section from the inlet of the drain trap section while maintaining that flow vector. On the other hand, among the cleaning water that flows into the lower end of the rear wall of the basin and near the rear end of the inlet of the drain trap, the cleaning water with a flow vector directed backward collides from above with a projection provided above the rear end of the inlet of the drain trap in the lower region of the rear wall of the basin, and bounces back upward or forward. As a result, the flow of the cleaning water is changed to an overall upward and forward flow, and a vertical swirling flow is formed within the basin. Furthermore, the vertically swirling flow of cleaning water within the basin, after completing one rotation, forms a flow that moves from the entrance of the drain trap into the drain trap, thereby agitating the waste within the basin through the vertical swirling before pushing it into the drain trap. These results can further improve the waste discharge performance of flush toilets.

[0009] In the present invention, preferably, the central bottom surface of the pot portion is provided with a recess formed such that its central region is recessed downward compared to the surrounding area, and this recess is located downward towards the inlet side of the drain trap portion behind it. In the present invention as described above, the washing water that forms a vertical swirling flow within the pot section flows into the recess after completing one rotation, and is then guided towards the entrance of the drain trap section along the recess which is located lower as it moves towards the entrance side of the rear drain trap section. This allows the waste to be agitated by vertical rotation within the jar section and then effectively pushed into the drain trap section. These results can further improve the waste discharge performance of flush toilets.

[0010] In the present invention, preferably, the recess is formed such that its width widens from left to right as it moves from its front end toward the front end of the inlet of the drain trap section on the rear side. In the present invention as described above, the recess in the central bottom surface of the pot portion is formed so that its width widens from its front end towards the front end of the inlet of the rear drain trap portion. Therefore, the washing water that has formed a vertical swirling flow within the pot portion and has entered the recess after completing one rotation can be guided along the recess toward a wide area towards the inlet of the rear drain trap portion. This allows the washing water containing the waste, which has been agitated by the vertical swirling flow within the basin, to be pushed with a strong force across the entire inlet of the drain trap. As a result, it is possible to prevent waste guided to the entire entrance of the drain trap from becoming clogged in the flow path of the drain trap, thereby further improving the waste discharge performance (discharge force) of flush toilets. [Effects of the Invention]

[0011] According to the flushing toilet of the present invention, the vertical stirring performance of the dirt in the pot part of the toilet body can be enhanced, and the dirt discharge performance can be improved.

Brief Description of the Drawings

[0012] [Figure 1] It is a schematic plan view of a flushing toilet according to an embodiment of the present invention. [Figure 2] It is a side cross-sectional view taken along line II-II of FIG. 1. [Figure 3A] In the side cross-sectional view of the flushing toilet according to an embodiment of the present invention shown in FIG. 2, it is an enlarged side cross-sectional view of the pot part of the toilet body. [Figure 3B] It is an enlarged side cross-sectional view of the front part of the pot part of the toilet body of the flushing toilet according to an embodiment of the present invention shown in FIG. 3A. [Figure 4A] It is a cross-sectional view taken along line IVA-IVA of FIG. 2. [Figure 4B] It is a cross-sectional view taken along line IVB-IVB of FIG. 2. [Figure 4C] It is a cross-sectional view taken along line IVC-IVC of FIG. 2. [Figure 5A] It is a cross-sectional view taken along line VA-VA of FIG. 2. [Figure 5B] In the toilet body of the flushing toilet according to an embodiment of the present invention shown in FIG. 5A, it is a cross-sectional view of the pot part of the bowl part enlarged. [Figure 6A] It is a cross-sectional view taken along line VIA-VIA of FIG. 2. [Figure 6B] In the toilet body of the flushing toilet according to an embodiment of the present invention shown in FIG. 6A, it is a cross-sectional view of the pot part of the bowl part enlarged. [Figure 7A] It is a cross-sectional view taken along line VIIA-VIIA of FIG. 2. [Figure 7B] In the toilet body of the flushing toilet according to an embodiment of the present invention shown in FIG. 7A, it is a cross-sectional view of the pot part of the bowl part enlarged. [Figure 8A] It is a cross-sectional view taken along line VIIIA-VIIIA of FIG. 2. [Figure 8B]Figure 8A is an enlarged cross-sectional view of the bowl portion of the toilet bowl body of a flush toilet according to one embodiment of the present invention. [Figure 9] This is a schematic plan view illustrating the flow of flushing water in a flush toilet bowl according to one embodiment of the present invention. The flushing water discharged from the second rim outlet in the bowl swirls from the rear to the front of the bowl before flowing into the urinal from the front. [Figure 10] This is a schematic side cross-sectional view illustrating the flow of flushing water in a flush toilet bowl according to one embodiment of the present invention. The flushing water discharged from the second rim outlet in the bowl swirls from the rear to the front of the bowl before flowing into the urinal from the front. [Modes for carrying out the invention]

[0013] A flush toilet according to one embodiment of the present invention will be described below with reference to Figures 1 to 10. 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, arranged from the upstream side to the downstream side. 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.

[0014] 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 bowl 2, behind the toilet seat (not shown) and toilet lid (not shown), functional parts (not shown) such as a sanitary washing section (not shown) for washing the user's private parts and a water supply system functional section involved in the water supply function to the toilet bowl 2 may be provided. However, since these are the same as the structure of conventional flush toilets, a detailed explanation will be omitted.

[0015] Next, as shown in Figure 1, a flush toilet 1 according to one embodiment of the present invention is equipped with a gravity-fed water storage tank 10, which is a water source for flushing toilets, storing the flushing water used for flushing the toilet bowl and supplying it to the toilet bowl body 2. In this embodiment, the water source that supplies flushing water to the toilet bowl 2 is not limited to a tank-type configuration such as the gravity-fed water storage tank 10 described above, but can be applied to other configurations as well. That is, the water source that supplies flushing water to the toilet bowl 2 may be a direct-pressure type configuration that directly utilizes the water supply pressure of the tap water, a flush valve type configuration, or a configuration that supplies flushing water using the supplemental pressure of a pump.

[0016] Next, in the flush toilet 1 according to one embodiment of the present invention shown in Figure 1, in a plan view of the bowl portion 6 of the toilet body 2, the central axis extending horizontally to the left and right so as to bisect the front-to-back direction with respect to the pot portion 12 provided in the left-right center of the bowl portion 6 is indicated by the symbol "X". Furthermore, in the plan view of the bowl portion 6 of the toilet body 2 shown in Figure 1, the central axis extending horizontally in the front-to-back direction so as to bisect the bowl portion 6 in the left-to-right direction is indicated by the symbol "Y". Furthermore, in the plan view of the bowl portion 6 of the toilet body 2 shown in Figure 1, the intersection of the respective central axes X and Y is defined as the center O of the bowl portion 6 in the plan view, and the central axis extending vertically through this center O is indicated by the symbol "Z" in Figures 1 and 2. Furthermore, as shown in Figure 1, the front, back, left, and right directions of the flush toilet 1 are indicated as "front," "back," "left," and "right," respectively.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Next, with reference to Figures 1 to 8B, the details of the bowl portion 6, the pot portion 12 and its surrounding area will be described. First, Figure 3A is an enlarged side cross-sectional view of the toilet bowl body, specifically the section of the bowl, in the side cross-sectional view of the flush toilet according to one embodiment of the present invention shown in Figure 2. Figure 3B is an enlarged side cross-sectional view of the front section of the toilet bowl body, specifically the section of the toilet bowl, in the flush toilet according to one embodiment of the present invention shown in Figure 3A. Next, Figures 4A to 4C are cross-sectional views along the IVA-IVA line, the IVB-IVB line, and the IVC-IVC line in Figure 2, respectively. Furthermore, Figure 5A is a cross-sectional view along the VA-VA line in Figure 2, and Figure 5B is an enlarged cross-sectional view of the bowl portion of the toilet bowl body of the flush toilet according to one embodiment of the present invention shown in Figure 5A. Furthermore, Figure 6A is a cross-sectional view along the VIA-VIA line in Figure 2, and Figure 6B is an enlarged cross-sectional view of the bowl portion of the toilet bowl body of the flush toilet according to one embodiment of the present invention shown in Figure 6A. Furthermore, Figure 7A is a cross-sectional view along the line VIIA-VIIA in Figure 2, and Figure 7B is an enlarged cross-sectional view of the bowl portion of the toilet body of a flush toilet according to one embodiment of the present invention shown in Figure 7A. Furthermore, Figure 8A is a cross-sectional view along the line VIIIA-VIIIA in Figure 2, and Figure 8B is an enlarged cross-sectional view of the bowl portion of the toilet bowl body of the flush toilet according to one embodiment of the present invention shown in Figure 8A.

[0022] First, as shown in Figures 2 and 3A, the jar portion 12 of the bowl portion 6 is located below the waste receiving surface 14, and the accumulated water forms a water reservoir W0. In Figures 2 and 3A, the water level (seal water level) of the water reservoir W0 in the bowl portion 12 of the bowl portion 6 in the standby state (water seal state) before toilet flushing is performed is indicated by the symbol "WL". Next, as shown in Figures 3A to 8B, the pot portion 12 is provided with a bottom wall 32 that is located above and in front of the inlet 30 of the drain trap portion 8 and forms the bottom surface 32a of the pot portion 12. Furthermore, the urn section 12 is equipped with a rear wall 34 (left rear wall 34a, right rear wall 34b) located behind the inlet 30 of the drain trap section 8. Furthermore, the vase portion 12 is provided with side walls 36 (rear side wall 36, rear left wall 36a, rear right wall 36b) that extend outward to the left and right from both left and right ends of the rear wall 34 (the left end of the left rear wall 34a and the right end of the right rear wall 34b) toward the front. Furthermore, the urn portion 12 is provided so as to narrow inward and forward from the left and right front ends of the rear side wall 36 (the respective front ends of the rear left side wall 36a and the rear right side wall 36b), and is equipped with side walls 38 (front side wall 38, front left side wall 38a, and front right side wall 38b) to which their front ends are joined.

[0023] Next, as shown in Figures 3A, 3B, 5B, 6B, 7B, and 8B, the pot portion 12 further includes a lower joint portion 40 that joins the outer edge 32b of the bottom surface 32a of the bottom wall 32 and the lower edges 36c, 38c of the side walls 36, 38 with a curved surface (curved surface C1). Furthermore, in the side cross-sectional views of Figures 3A and 3B, and the front cross-sectional views of Figures 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 40 is set to be greater than the curvature of the tangent plane C2 including the bottom surface 32a at the lower joint point P1, which joins the lower edge 40a of the lower joint 40 (the lower edge 40a of the curved surface C1) with the outer edge 32b of the bottom surface 32a of the bottom wall 32. Similarly, in the side cross-sectional views of Figures 3A and 3B, and the front cross-sectional views of Figures 5B, 6B, 7B, and 8B, the curvature of the curved surface C1 of the lower joint 40 is set to be greater than the curvature of the tangent plane C3 that includes the wall surfaces of the side walls 36 and 38 at the upper joint point P2 where the upper edge 40b of the lower joint 40 (upper edge 40b of the curved surface C1) is joined to the lower edges 36c and 38c of the side walls 36 and 38.

[0024] Next, as shown in Figures 3A, 3B, 5B, 6B, 7B, and 8B, the jar portion 12 is further provided with an upper joint portion 42 that joins the upper edges 36d, 38d of its side walls 36, 38 and the lower edge 14a of the waste receiving surface 14 with a curved surface (curved surface C4). Furthermore, in the side cross-sectional views of Figures 3A and 3B, and the front cross-sectional views of Figures 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 42 is set to be greater than the curvature of the tangent plane C5 that includes the wall surfaces of the side walls 36 and 38 at the lower joint point P3 where the lower edge 42a of the upper joint 42 (lower edge 42a of the curved surface C4) is joined to the upper edges 36d and 38d of the side walls 36 and 38. Similarly, in the side cross-sectional views of Figures 3A and 3B, and the front cross-sectional views of Figures 5B, 6B, 7B, and 8B, the curvature of the curved surface C4 of the upper joint 42 is set to be greater than the curvature of the tangent plane C6, which includes the wall surface of the waste receiving surface 14 at the upper joint point P4 where the upper edge 42b of the upper joint 42 (upper edge 42b of the curved surface C4) and the lower edge 14a of the waste receiving surface 14 are joined.

[0025] In the flush toilet bowl 1 of this embodiment shown in Figures 1 to 4C, 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". Furthermore, the boundary line between the lower joint 40 of the lower joint 40 of the lower joint 40 of the lower joint 40 of the lower joint 40 and the lower edges 36c and 38c of the lower joint 36 and 38 of the lower joint 36 and 38 of the lower joint 40 of the lower joint 40 of the lower joint 40 of the lower joint 40 and the lower joint 36 and 38 of the lower joint 36 and 38 of the lower joint 40 of the lower joint 40 of the lower joint 40 of the lower joint 40 of the lower joint 40 of the lower joint 40 of the lower Furthermore, the boundary line between the side walls 36, 38 of the vase portion 12 and the upper joint portion 42, which corresponds to the upper edges 36d, 38d of the side walls 36, 38 of the vase portion 12 and the lower edge 42a of the upper joint portion 42, is indicated by the symbol "L3". Furthermore, the boundary line between the upper joint 42 of the upper joint 42 of the pot portion 12 and the waste receiving surface 14, which corresponds to the upper edge 42b of the upper joint 42 of the pot portion 12 and the lower edge 14a of the waste receiving surface 14, is indicated by the symbol "L4".

[0026] Furthermore, as shown in Figures 3A and 3B, the vertical distance between the pot portion 12 and the waste receiving surface 14 (the vertical distance between boundary line L3 and boundary line L4 shown in Figure 3A) corresponds to the vertical width H1 from the lower edge 42a to the upper edge 42b in a side view of the upper joint portion 42, and this vertical width H1 is set to decrease as you move from the rear side to the front side of the pot portion 12. This allows the pot portion 12 and the waste receiving surface 14 to be brought closer to each other in the vertical direction as you move from the rear to the front.

[0027] Next, as shown in Figures 6B, 7B, and 8B, the bottom wall 32 of the pot portion 12 has recesses 44 formed to be recessed downwards from left to right with respect to its left and right central axes Z in a front cross-sectional view. Furthermore, as shown in Figures 4A to 4C, 6B, 7B, and 8B, in the bottom wall 32 of the pot portion 12, a transition region 46 is provided in the area between the lower joint portion 40 and the left and right inner recesses 44, where the shape of the bottom wall 32 transitions from the lower joint portion 40 towards the recesses 44. This transition region 46 is formed to be convex, projecting upward from a planar shape as it moves inward from the lower joint portion 40 to the left and right, and then transitioning to a concave shape of the recess 44. Furthermore, as shown in Figures 4A to 4C, the recess 44 is formed in a fan shape such that, in a plan view, its width in the left-right direction widens towards the inlet 30 of the rear drain trap section 8.

[0028] Next, as shown in Figures 3A, 6B, 7B, and 8B, in a side cross-sectional view, the bottom surface 44a of the recess 44 protrudes downward in the front-rear direction and is inclined downward towards the inlet 30 of the rear drain trap section 8. Furthermore, as shown in Figures 3A, 4A to 4C, and 5B, a guide portion 48 is provided in the region between the lower joint portion 40 and the recess 44 in front of the recess 44, to prevent excessive flow of cleaning water into the recess 44 from the cleaning water that flows into this region. This guide portion is formed in a planar or upwardly projecting convex shape. Furthermore, as shown in Figures 6B, 7B, and 8B, the recess 44 is configured such that, in a front or side cross-sectional view, the vertical recess amount d1 from the apex position P5 of the convex portion in the transition region 46 to the lowest bottom surface position P6 of the recess 44 increases towards the inlet 30 of the rear drain trap section 8.

[0029] Next, as shown in Figures 3A and 4A to 4C, the recess 44 of the pot portion 12 has a rear end 44b whose bottom surface 44a is connected to the inlet 30 of the drain trap portion 8. Furthermore, the recess 44 of the vase portion 12, in the side cross-sectional view in Figure 3A, includes a first tangent line T1 extending in the front-rear direction from its rear end 44b along the bottom surface 44a, and a first tangent line extension T2 which extends this first tangent line T1 to the rearward side from the rear end 44b. Furthermore, in the side cross-sectional view of Figure 3A, the drain trap section 8 extends from its inlet 30 to its lowest end 50, which is both rearward and downward, and then forms a trap conduit 52 that extends rearward and upward from this lowest end 50. Furthermore, in the side cross-sectional view shown in Figure 3A, the first tangent extension T2 is set to pass through a height position lower than the height position of the rear end 30a of the inlet 30 of the drain trap section 8, at the same front-to-back position relative to the rear end 30a of the inlet 30 of the drain trap section 8. Furthermore, in the side cross-sectional view of Figure 3A, the first tangent extension T2 is located within the trap pipe 52 such that it passes at a height below the upper surface 52a within the trap pipe 52 from the inlet 30 to the lowest end 50 of the drain trap section 8. Here, as shown in Figure 3A, within the trap pipe 52 from the lower end of the protrusion 54 at the rear end 30a of the inlet 30 of the drain trap section 8 to the lowest end 50 of the drain trap section 8, the shape of the upper surface 52a in a side cross-sectional view is formed to be substantially planar.

[0030] Next, in the side cross-sectional view of Figure 3A, the waste receiving surface 14 includes a second tangent line T3 extending in the front-rear direction along the waste receiving surface 14, and a second tangent extension T4 extending the second tangent line T3 to the rearward side from the lower edge 14a of the waste receiving surface 14. Furthermore, the first tangent extension T2 and the second tangent extension T4 described above are set to be approximately parallel to each other in the side cross-sectional view shown in Figure 3A.

[0031] Next, as shown in Figures 4A to 4C, the rear side wall 36 of the vase portion 12 is formed such that the left and right side walls 36a and 36b, in a plan view, are located on the inside of the vase portion 12 as they move from top to bottom. Furthermore, as shown in Figures 3A and 4A to 4C, a projection 54 is provided above the rear end 30a of the inlet 30 of the drain trap section 8 in the lower region of the rear walls 34a and 34b of the pot section 12, projecting forward.

[0032] Next, as shown in Figures 3A and 4A to 4C, the bottom wall 32 of the pot portion 12 comprises a central bottom surface 56 that includes the position of the center O in the front-rear direction of the pot portion 12, and circumferential bottom surfaces 58 formed on the left and right peripheral edges 56a of this central bottom surface 56. First, the central bottom surface 56 forms a recess 44 in which its central region is lower than the surrounding area, and it is located lower as it approaches the inlet 30 of the drain trap section 8 behind it. Furthermore, the width of the central bottom surface 56 in the left-right direction is fan-shaped, as seen in the plan view in Figures 4A to 4C, so that it widens from the front end 56b of the central bottom surface 56 towards the rear end 56c (corresponding to the front end 30b of the inlet 30 of the rear drain trap section 8). Next, the periphery bottom surface 58 connects the left and right periphery edges 56a of the central bottom surface 56 to the lower edge 40a of the lower joint 40 (corresponding to the inner edge of the lower joint 40 in the plan view of Figures 4A to 4C), and is essentially a surface that forms the transition region 46 of the bottom wall 32 of the vase portion 12. Furthermore, as shown in Figure 3A, the peripheral bottom surface 58 is formed at a higher position than the central bottom surface 56, and its rear end 58a is joined to the protruding portion 54. As a result, in the side cross-sectional view of Figure 3A, the peripheral bottom surface 58 is positioned upward from the rear side where it is joined to the protruding portion 54 towards the front side.

[0033] Next, as shown in Figures 4A to 4C, the protrusion 54 is provided at the lower end of the rear wall 34 of the pot section 12, and also extends across the entire widthwise area of ​​the rear end 30a of the inlet 30 of the drain trap section 8. Furthermore, as shown in Figures 4A to 4C, the protruding portion 54 has its front end 54a in a plan view that is curved in a convex shape toward the rear.

[0034] Next, as shown in Figure 3A, the inlet 30 of the drain trap section 8 has a rear end 30a joined to the lower end of the rear wall 34 of the pot section 12, and a front end 30b joined to the left and right center rear end 56c of the central bottom surface 56 of the bottom wall 32 of the pot section 12. Furthermore, as shown in Figure 3A, the front end 30b of the inlet 30 of the drain trap section 8 is located at a lower position than the rear end 30a of the inlet 30 of the drain trap section 8.

[0035] Next, with reference to Figures 1 to 10, the flow of flushing water in the bowl portion 6 during toilet flushing in a flush toilet 1 according to one embodiment of the present invention will be described. Figure 9 is a schematic plan view illustrating the flow of flushing water in a flush toilet bowl according to one embodiment of the present invention. The flushing water discharged from the second rim outlet swirls from the rear to the front of the bowl before flowing into the urinal from the front. Figure 10 is a schematic side cross-sectional view illustrating the flow of flushing water in a flush toilet bowl according to one embodiment of the present invention. The flushing water discharged from the second rim outlet swirls from the rear to the front of the bowl before flowing into the urinal from the front. First, as shown in Figure 9, in the flush toilet 1 of this embodiment, when toilet flushing is started, flushing water W in the water storage tank 10 is supplied from the inlet 4a of the water conduit 4 of the toilet body 2 to the common water conduit 24. The flushing water W in this common water conduit 24 branches into the first rim water conduit 26 and the second rim water conduit 28, respectively, as first flushing water W1 and second flushing water W2.

[0036] Next, as shown in Figures 9 and 10, the first washing water W1 from the first rim water channel 26 is discharged forward from the first rim outlet 20 on the downstream side as the first rim discharge water W1. This first rim discharge water W1 forms a swirling flow f1 that swirls from the left front region LF to the right front region RF and then to the right rear region RB within the bowl section 6. On the other hand, as shown in Figures 9 and 10, the second washing water W2 from the second rim water channel 28 is discharged as the second rim discharge water W2 from the second rim discharge port 22. This second rim discharge water W2 swirls from the right rear region RB within the bowl section 6 through the left rear region LB to the left front region LF, and then forms a flow f2 that flows from this left front region LF into the front region within the pot section 12. Furthermore, a portion of the second rim discharge water W2 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.

[0037] Next, as shown in Figures 9 and 10, the washing water W3 that flows into the pot section 12 is collected on the side of the recess 44 (left and right center side) of the bottom wall 32 of the pot section 12, forming a flow f3 of washing water that converges from the bottom wall 32 of the pot section 12 toward the inlet 30 of the drain trap section 8, creating a flow that powerfully pushes the waste into the drain trap section 8. Furthermore, some of the washing water W3 guided downwards to the pot section 12 then strikes from above a protrusion 54 located above the rear end 30a of the inlet 30 of the drain trap section 8 in the lower region of the rear walls 34a, 34b of the pot section 12. As a result, the wash water W3 after the collision bounces upward or forward, changing the overall flow f4 of the wash water W3 to an upward flow. Then, the flow of washing water f4 forms a flow that swirls vertically (hereinafter referred to as "vertical swirling flow f4"), and the waste in the pot section 12 is mixed with the washing water that flows into the pot section 12 and the water in the reservoir section W0, and then discharged into the drain trap section 8 from the inlet 30 of the drain trap section 8.

[0038] On the other hand, the washing water W3 that flows from the waste receiving surface 14 at the front of the pot section 12 along the front side wall 38 (see the front right side wall 38b in particular in Figures 9 and 10) to the rear side wall 36 (see the rear right side wall 36b in Figures 9 and 10) collides with the wall surface of the rear side wall 36b, and is then guided along the wall surface of the rear side wall 36b toward the lower end and rear of the pot section 12, flowing into the vicinity of the lower end of the rear walls 34a, 34b of the pot section 12 and the rear end 30a of the inlet 30 of the drain trap section 8. Then, of the cleaning water W3 that flows into the lower end of the rear wall 34 (34a, 34b) of the pot section 12 and near the rear end 30a of the inlet 30 of the drain trap section 8, the cleaning water W3 that has a flow vector that is directed downward rather than backward flows into the drain trap section 8 from the inlet 30 of the drain trap section 8 while maintaining the vector of its flow f3.

[0039] In the flush toilet 1 according to the embodiment of the present invention described above, a portion of the flushing water W1 and W2 discharged into the bowl portion 6 from the first rim outlet 20 and the second rim outlet 22, respectively, swirls on the waste receiving surface 14 to the front side of the urinal portion 12, and then flows into the urinal portion 12 from the front side of the urinal portion 12 (see the flow of flushing water W3 f3 in Figure 9). In this process, the washing water W3 that flows from the waste receiving surface 14 above and in front of the pot portion 12 along the front side wall 38 inside the pot portion 12 (see in particular the front right side wall 38b in Figures 9 and 10) to the rear side wall 36 (see in particular the rear right side wall 36b in Figures 9 and 10) is guided downwards along the left and right rear side walls 36a and 36b located inside the pot portion 12 as it moves from top to bottom in the plan view of the rear side wall 36 shown in Figures 4A to 4C. The washing water W3 guided downwards to the pot section 12 then strikes from above a protrusion 54 located above the rear end 30a of the inlet 30 of the drain trap section 8 in the lower region of the rear walls 34a, 34b of the pot section 12. Furthermore, the wash water W3 after the collision bounces upward or forward, changing the overall flow f3 of the wash water W3 to an upward flow f4. As a result, the flow of washing water f3 forms a flow that swirls vertically (vertical swirling flow f4), and the waste in the pot section 12 is mixed with the washing water that flows into the pot section 12 and the water in the reservoir section W0, and then discharged into the drain trap section 8 from the inlet 30 of the drain trap section 8. Therefore, since the washing water W3 containing waste and the accumulated water can be easily mixed within the tub 12, the waste discharge performance of the flush toilet 1 can be improved.

[0040] Furthermore, according to the flush toilet 1 of this embodiment, of the flushing water W3 that flows from above into the rear region of the pot section 12, the flushing water W3 that flows down from above along the wall surface of the rear wall 34 (34a, 34b) of the pot section 12 to the protruding part 54 collides with the protruding part 54. The washing water W3 that collides with the protruding portion 54 is directed forward along the shape of the forward-protruding portion 54, and then guided to the front region inside the pot portion 12 along the circumferential bottom surface 58 to which the rear end 58a is joined to the protruding portion 54. Furthermore, the washing water W3 guided to the front region along the circumferential bottom surface 58 inside the pot section 12 can form a vertical swirling flow f2 by colliding with the front side walls 38a and 38b and then rising along these walls. As a result, the waste-containing washing water W3 and the accumulated water can be effectively mixed within the tub 12, thereby further improving the waste discharge performance of the flush toilet 1.

[0041] Furthermore, according to the flush toilet 1 of this embodiment, of the flushing water W1 and W2 discharged into the bowl portion 6 from the first rim outlet 20 and the second rim outlet 22, which are the water discharge sections, the flushing water W3 that flows from the waste receiving surface 14 at the front of the urn portion 12 along the front side wall 38 (in particular, see the front right side wall 38b in Figures 9 and 10) to the rear side wall 36 (in particular, see the rear right side wall 36b in Figures 9 and 10) collides with the wall surface of the rear side wall 36b, and is then guided downward and towards the rear of the urn portion 12 along the wall surface of the rear side wall 36b, and flows near the lower ends of the rear walls 34a, 34b of the urn portion 12 and the rear end 30a of the inlet 30 of the drain trap portion 8. Then, of the cleaning water W3 that flows into the lower end of the rear wall 34 (34a, 34b) of the pot section 12 and near the rear end 30a of the inlet 30 of the drain trap section 8, the cleaning water W3 that has a flow vector that is directed downward rather than backward flows into the drain trap section 8 from the inlet 30 of the drain trap section 8 while maintaining the vector of its flow f3. On the other hand, of the cleaning water W3 that flows into the lower end of the rear wall 34 (34a, 34b) of the pot section 12 and near the rear end 30a of the inlet 30 of the drain trap section 8, the cleaning water W3 that has a flow vector directed backward will collide from above with the protrusion 54 provided above the rear end 30a of the inlet 30 of the drain trap section 8 in the lower region of the rear wall 34 (34a, 34b) of the pot section 12, and will bounce back upward or forward. As a result, the flow of the washing water f3 is changed to an overall upward and forward flow, and a vertical swirling flow f4 is formed within the pot section 12. Furthermore, the washing water W3 of the vertical swirling flow f4 within the pot section 12, after swirling once in the vertical direction, forms a flow f3 that flows from the inlet 30 of the drain trap section 8 into the drain trap section 8. This allows the waste to be agitated in the pot section 12 by the vertical swirling flow f4 and then pushed into the drain trap section 8 by the flow f3. As a result, the waste discharge performance of the flush toilet 1 can be further improved effectively.

[0042] Furthermore, according to the flush toilet 1 of this embodiment, the flushing water W3 that forms a vertical swirling flow f4 in the pot section 12 flows into the recess 44 after swirling once in the vertical direction, and is guided to the inlet 30 of the drain trap section 8 along the recess 44 which is located downwards as it moves towards the inlet 30 of the rear drain trap section 8. This allows the waste to be agitated in the pot section 12 by vertical rotation and then effectively pushed into the drain trap section 8. As a result, the waste discharge performance of the flush toilet 1 can be improved even more effectively.

[0043] Furthermore, in the flush toilet 1 according to this embodiment, the recess 44 in the central bottom surface 56 of the pot portion 12 is formed so that its width widens from left to right as it moves from its front end 56bb towards the front end 30b of the inlet 30 of the rear drain trap portion 8. As a result, the washing water W3 that forms a vertical swirling flow f4 within the pot section 12, after swirling once in the vertical direction, can be guided along the recess 44 towards a wide area of ​​the inlet 30 of the rear drain trap section 8. This allows the washing water W3 containing the waste stirred by the vertical swirling flow f4 in the pot section 12 to form a flow f3 that pushes the waste through the entire area of ​​the inlet 30 of the drain trap section 8 with a strong pushing force. As a result, it is possible to suppress blockage in the trap pipe 52 of the drain trap section 8 by waste guided throughout the entire inlet 30 of the drain trap section 8, thereby further improving the waste discharge performance (discharge force) of the flush toilet 1. [Explanation of Symbols]

[0044] 1 flush toilet 2 Toilet bowl 4. Water conduit 4a Entrance to the water conduit 6 Bowl section 8. Drain trap section 10. Water storage tank (water source for washing) 12. Jar section 14. Waste receiving surface 14a Lower edge of the waste receiving surface 16 Shelf 18 Rim section 20. First rim outlet (discharge section) 22. Second rim outlet (discharge section) 24 Common water conduit 26. First Rim Waterway 28. Second Rim Waterway 30 Inlet of drain trap 30a Rear end of the inlet of the drain trap section 30b Front end of the inlet of the drain trap section 32 Bottom wall of the jar 32a Bottom surface of the bottom wall of the jar 32b Outer edge of the bottom wall of the jar 34. Rear wall of the jar section 34a Left rear wall of the vase section 34b Right rear wall of the vase section 36. Rear side wall of the jar section (side wall of the jar section) 36a Rear left wall of the vase section (side wall of the vase section) 36b Rear right wall of the jar section (side wall of the jar section) 36c Lower edge of the rear side wall of the jar section (lower edge of the side wall of the jar section) 36d Upper edge of the rear side wall of the vase 38 Front side wall of the jar section (side wall of the jar section) 38a Front left wall of the jar section (side wall of the jar section) 38b Front right wall of the jar section (side wall of the jar section) 38c Lower edge of the front side wall of the jar section (lower edge of the side wall of the jar section) 38d Upper edge of the rear side wall of the vase section 40 Lower joint (joint of the vase section) 40a Lower edge of the lower joint 40b Upper edge of the lower joint 42 Upper joint 42a Lower edge and inner edge of the upper joint 42b Upper edge of the upper joint 44 Recess in the bottom wall of the jar 44a Bottom surface of the recess 44b Rear end of recess 46 Transition region of the bottom wall of the jar section 48 Guide section 50 The lowest part of the drain trap section 52 Trap pipeline 52a Upper surface of the trap pipe from the inlet to the lowest end of the drain trap section 54 Protrusion 54a Front end of the protruding portion 56 Central bottom surface of the bottom wall of the jar 56a Periphery of the central base 56b Front end of the central base 56c Rear end of central base 58 Peripheral bottom surface of the bottom wall of the jar 58a Rear end of the circumferential base B Rear area of ​​the bowl C1 Curved surface of the lower joint (surface with curvature of the joint) C2 tangent plane C3 tangent plane C4 Curved surface of the upper joint (surface with curvature of the joint) C5 tangent plane C6 Tangent plane d1 The amount of recess in the vertical direction from the apex position of the convex portion in the transition region to the lowest bottom surface position of the concave portion. F Anterior region of the bowl section f1 Flow of cleaning water f2 Flow of cleaning water f3 Flow of washing water f4 Flow of cleaning water (vertical swirling flow) H1 Vertical width in side view of the upper joint Left side area of ​​the L-shaped bowl Left rear area of ​​the LB bowl LF (Left Front Area of ​​Bowl) L1 Boundary line between the bottom wall of the vase section and the lower joint. L2 Boundary between the lower joint of the vase section and the side wall L3 Boundary line between the side wall of the vase section and the upper joint. L4 Boundary between the upper joint of the pot section and the waste receiving surface O The center of the bowl section, the center of the vase section in the front-to-back direction. P1 Lower joint point where the lower edge of the lower joint and the outer edge of the bottom surface of the bottom wall are joined. P2 Upper joint point where the upper edge of the lower joint and the lower edge of the side wall are joined. P3 Lower joint point where the lower edge of the upper joint and the upper edge of the side wall are joined. P4 Upper joint point where the upper edge of the upper joint and the lower edge of the waste receiving surface are joined. P5 The apex position of the convex-shaped portion in the transition region of the bottom wall of the jar. P6 Lowest bottom position of the recess in the bottom wall of the jar section Right side of the R bowl section RB Bowl section, right rear area Right front area of ​​the RF bowl T The tip of the vase (the front end of the vase) T1 is the first tangent line extending in the front-to-back direction along the bottom surface from the rear end of the recess in the vase section. T2 1st tangent extension T3 A second tangent line extending in the front-to-back direction along the bottom surface from the rear end of the recess in the vase section. T4 2nd tangent extension W Cleaning Water W0 Reservoir W1 First flush water, first rim discharge water W2 Second flush water, second rim discharge water W3 Cleaning water inside the pot WL Seal water level 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.

Claims

1. A flush toilet that is flushed with flush water to discharge waste, a bowl portion including a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a pot portion provided below the waste receiving surface to form a water reservoir portion by storing water; a water discharge portion provided in the rim portion and discharging flush water toward the inside of the bowl portion; a drain trap portion having an inlet connected to a lower portion of the pot portion and for discharging waste from within the bowl portion; The pot portion comprises a bottom wall formed above and forward of the inlet of the drain trap portion, a rear wall provided on the rear side of the inlet of the drain trap portion, rear side walls provided so as to widen outward to the left and right from both left and right ends of the rear wall toward the front, and front side walls provided so as to narrow inward to the left and right from the left and right front ends of the rear side walls toward the front, and the front ends of the front side walls are joined together, The rear side wall is formed such that left and right wall surfaces in a plan view are positioned more inwardly of the pot portion as they extend from above to below, A flush toilet characterized in that a protrusion that protrudes forward is provided above the rear end of the inlet of the drain trap portion in the lower region of the rear wall.

2. The pot portion further includes a joint portion at a surface having a curvature between an outer edge of the bottom wall and a lower edge of each of the rear side wall and the front side wall, The flush toilet of claim 1, wherein the bottom wall of the basin portion comprises a central bottom surface that includes the center position of the basin portion in the front-to-rear direction, and a peripheral bottom surface that is formed at a higher position than the central bottom surface by joining the peripheral edge of this central bottom surface to the lower edge of the joining portion, the rear end of this peripheral bottom surface being joined to the protruding portion, and the peripheral bottom surface being positioned upward from the rear side joined to the protruding portion toward the front side in a side cross-sectional view.

3. A flush toilet according to claim 1 or 2, wherein the protrusion is provided across the entire width of the lower end of the rear wall of the basin portion and the rear end of the inlet of the drain trap portion, and the front end of the protrusion is formed in a convex curve facing rearward in a plan view.

4. A flush toilet according to claim 2, wherein the central bottom surface of the basin portion has a recess formed so that its central region is recessed downward compared to the surrounding area, and this recess is positioned downward as it moves toward the inlet side of the drain trap portion behind it.

5. 5. The flush toilet according to claim 4, wherein the recess is formed so that its left-right width increases from its front end toward the front end of the inlet of the drain trap portion on the rear side.

Images