Flush toilet

Abstract

A flush toilet according to the present invention is provided with: a bowl part provided with a waste receiving surface, a rim part, and a basin part; a first water spouting port provided on the left side of the bowl portion and spouting wash water along the rim portion; a second water spouting port which is provided on the right side of the bowl part and spouts washing water toward the rear side area of the bowl part; and a drain line connected to the bottom of the bowl part, the dirt receiving surface and the inner peripheral surface of the rim part being connected by a connection part provided in the rear region of the bowl part with: an upward inclined part inclined upward in the flow direction of the wash water swirling along the rim part, and an upward inclined part inclined downward in the flow direction of the wash water swirling along the rim part; and a downward inclined part located on the downstream side of the upward inclined part and inclined downward in the flow direction of the washing water.

Description

Technical Field

[0001] The present invention relates to a flush toilet, and in particular to a flush toilet which discharges waste by using cleaning water supplied from a cleaning water source. Background Art

[0002] In the past, for example as described in Patent Document 1, there is known a flush toilet comprising: a waste receiving surface for receiving waste; an inner edge portion formed above the waste receiving surface; a pool portion formed below the waste receiving surface and having a water accumulation surface formed therein; and a first water spout and a second water spout arranged on the inner edge portion for forming a swirling flow. In addition, in this flush toilet, the first water spout is set in front of the bowl, and the second water spout is set at the rear of the bowl. A part of the cleaning water spouted from the second water spout flows directly into the water accumulation surface in the pool, and after colliding with the bottom wall of the pool, forms a longitudinal swirling water flow in the pool. Thus, waste can be pressed into and discharged into the drainage pipe. On the other hand, the remaining cleaning water spouted from the second water spout swirls along the inner edge and then flows down on the waste receiving surface. Thus, waste attached to the waste receiving surface can be washed away.

[0003] Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2021-71009 Summary of the invention

[0004] However, in this flush toilet, in order to reduce the area of ​​the dry surface, that is, the waste receiving surface and inhibit the adhesion of waste, it is conceivable to make the water accumulation surface larger than before. However, in the flush toilet described in Patent Document 1, when the water accumulation surface is formed larger than before, the water flow swirling vertically in the pool portion is dispersed, so even if the washing water is directly flowed from the second spouting port into the water accumulation surface in the pool portion, a vertical swirling water flow sufficient to discharge waste cannot be formed. As a result, there is a problem that waste, especially floating waste floating on the surface of the water accumulation surface, cannot be fully discharged. On the other hand, if the flow rate of cleaning water flowing directly from the second water outlet into the water accumulation surface in the pool is increased, the water force of the water flow swirling longitudinally in the pool can be enhanced. However, since the amount of cleaning water swirling along the inner edge is reduced, there is a problem that the dirt receiving surface cannot be fully cleaned.

[0005] The present invention is made to solve the above-mentioned problems. The technical problem to be solved is to provide a flush toilet that can improve the discharge performance of waste even if the water accumulation surface is formed larger and can fully clean the waste receiving surface.

[0006] In order to achieve the above-mentioned object, the present invention is a flush toilet that uses cleaning water supplied from a cleaning water source to discharge waste, characterized in that it comprises: a bowl portion, which has a waste receiving surface, an inner edge portion, and a pool portion, wherein the waste receiving surface is bowl-shaped, the inner edge portion has an inner peripheral surface rising from the outer edge of the waste receiving surface, the pool portion is formed below the waste receiving surface, and a water accumulation surface is formed therein; a first water spout is provided on the inner edge portion on one side in the left-right direction of the bowl portion, and the cleaning water is spouted along the inner peripheral surface of the inner edge portion to form a swirling flow; a second water spout is provided The utility model relates to a drainage pipe which is arranged on the inner edge portion on the other side of the left-right direction of the basin portion, and discharges cleaning water in the same direction as the swirling direction of the cleaning water discharged from the first water discharge port and toward the rear area of ​​the basin portion; and a drainage pipe which is connected to the bottom of the basin portion, and the dirt receiving surface is connected to the inner peripheral surface of the inner edge portion by a connecting portion, and the connecting portion is provided in the rear area of ​​the basin portion with: an upward inclined portion which is inclined upward toward the flow direction of the cleaning water swirling along the inner edge portion; and a downward inclined portion which is located on the downstream side of the upward inclined portion and is inclined downward toward the flow direction of the cleaning water. In the present invention thus constructed, since the waste receiving surface is connected to the inner peripheral surface of the inner edge portion by a connecting portion, and the connecting portion is provided in the rear area of ​​the bowl portion with: an upward inclined portion, which is inclined upward toward the flow direction of the washing water swirling along the inner edge portion; and a downward inclined portion, which is located on the downstream side of the upward inclined portion and is inclined downward toward the flow direction of the washing water, a portion of the washing water ejected from the second water spouting port flows down due to pressure loss caused by flowing through the upward inclined portion, and flows into the water surface of the pool portion with good water momentum and forms a longitudinal swirling water flow. Therefore, the waste discharge performance can be improved. On the other hand, the remaining washing water ejected from the second water spouting port increases its flow velocity due to flowing through the downward inclined portion, and swirls along the inner edge portion with good water momentum. Therefore, the washing water can be spread over the entire waste receiving surface. Therefore, even if the water accumulation surface is formed larger, the waste discharge performance can be improved and the waste receiving surface can be fully cleaned.

[0007] In the present invention, it is preferred that the ascending inclined portion includes a concave curved portion curved so as to be concave downward, and the descending inclined portion includes a convex curved portion curved so as to be convex upward. In the present invention thus constructed, since the ascending inclined portion has a concave curved portion that is curved in a manner concave downward, and the descending inclined portion has a convex curved portion that is curved in a manner protruding upward, a portion of the cleaning water ejected from the second water outlet can flow downward by passing through the concave curved portion of the ascending inclined portion, and the remaining cleaning water can increase the flow rate by passing through the convex curved portion of the descending inclined portion.

[0008] In the present invention, it is preferable that the upward inclined portion includes a convex curved portion that is located on the downstream side of the concave curved portion and is curved so as to protrude upward. In the present invention thus constructed, since the upward inclined portion has a convex curved portion located on the downstream side of the concave curved portion and curved in a manner protruding upward, a portion of the cleaning water ejected from the second water outlet can flow downward due to pressure loss by flowing through the convex curved portion of the upward inclined portion and flow into the water accumulation surface of the pool portion.

[0009] Furthermore, in the present invention, it is preferable that a horizontal portion formed substantially horizontally is provided between the upward inclined portion and the downward inclined portion. In the present invention thus constituted, since the horizontal portion formed substantially horizontally is provided between the ascending inclined portion and the descending inclined portion, the washing water having a reduced flow velocity after passing through the ascending inclined portion can be carried to the horizontal portion and swirled.

[0010] In the present invention, it is preferable that the horizontal portion is provided on one side in the left-right direction of the bowl portion on the opposite side to the second spouting port. In the present invention thus constituted, the horizontal portion is provided on one side of the bowl opposite to the second spouting port in the left-right direction, so that the washing water having a reduced flow rate flowing through the bowl opposite to the second spouting port can be carried to the horizontal portion and swirled.

[0011] Furthermore, in the present invention, it is preferred that the height position of the waste receiving surface is such that, in the rear region of the bowl, the height position of the other side of the bowl in the left-right direction is lower than the height position of the one side of the bowl in the left-right direction. In the present invention thus constructed, since the height position of the waste receiving surface is such that, in the rear area of ​​the bowl, the height position of the other side in the left-right direction of the bowl is lower than the height position of one side in the left-right direction of the bowl, a portion of the cleaning water ejected from the second water spout can flow down from the lowered waste receiving surface and flow into the water accumulation surface of the pool.

[0012] In the present invention, the upward inclined portion is preferably located near the second water discharge port. In the present invention thus constituted, since the upward slope is located near the second spouting port, part of the washing water spouted from the second spouting port can flow down earlier, and a vertical swirling water flow can be formed earlier in the bowl portion.

[0013] In addition, in the present invention, it is preferred that a protrusion protruding toward the inner side of the bowl is provided on the upper part of the inner circumferential surface of the inner edge portion near the upstream side of the second water spout, and the protrusion has a bottom surface, and the bottom surface is configured to change the flow direction of the cleaning water flowing through the inner circumferential surface of the inner edge portion to a downward direction. In the present invention thus constituted, a protrusion protruding toward the inside of the bowl is provided on the upper portion of the inner peripheral surface of the inner edge near the upstream side of the second spout, and the protrusion has a bottom surface, and the bottom surface is configured to change the flow direction of the washing water flowing through the inner peripheral surface of the inner edge to a downward direction, so that the flow direction can be directly changed downward by the bottom surface of the protrusion, thereby increasing the water force of the washing water flowing toward the water accumulation surface in the pool. As a result, the force for pressing in waste can be increased, and even if the water accumulation surface is formed larger than before, the waste discharge performance can be improved.

[0014] In the present invention, it is preferable that the amount of protrusion of the innermost end of the protrusion toward the inner side of the bowl portion relative to the lower end of the inner peripheral surface of the inner edge portion is set to increase toward the downstream side and then decrease. In the present invention thus constructed, it is preferred that the protrusion amount of the innermost end of the protrusion protruding toward the inner side of the bowl relative to the lower end of the inner circumferential surface of the inner edge portion be set to increase toward the downstream side and then decrease, thereby making the protrusion less noticeable and allowing the cleaning water swirling on the inner circumferential surface of the inner edge portion to collide with the protrusion and flow down.

[0015] Furthermore, in the present invention, it is preferable that the maximum protrusion amount of the protrusion be set so as to be maximum on the inner peripheral surface of the inner edge portion in the rear region of the bowl portion. In the present invention thus constituted, the maximum protrusion amount of the protrusion is set to be the largest on the inner peripheral surface of the inner edge in the rear area of ​​the bowl, so that the washing water swirling on the inner peripheral surface of the inner edge can reliably collide with the protrusion and flow down.

[0016] In the present invention, it is preferable that the inner peripheral surface of the inner edge portion below the protruding portion is formed so that the radius of curvature of the inner peripheral surface in a plan view is the smallest in the entire circumference of the bowl portion. In the present invention thus constituted, since the inner peripheral surface of the inner edge portion below the protrusion is formed so that the radius of curvature of the inner peripheral surface when viewed from above is the smallest in the entire circumference of the bowl, a relatively large pressure loss can be caused to the swirling washing water. As a result, the washing water can be expanded in the longitudinal direction and can collide with the protrusion.

[0017] Furthermore, in the present invention, it is preferred that the upper edge portion of the waste receiving surface be inclined upward from the front end thereof toward the protruding portion. In the present invention thus constituted, since the upper edge of the waste receiving surface is inclined upward from its front end toward the protrusion, the washing water swirling on the upper edge of the waste receiving surface can be guided toward the protrusion and can collide with the protrusion.

[0018] In the present invention, it is preferred that an inclined portion inclined upward and inwardly of the bowl portion is provided on the inner peripheral surface of the inner edge portion above the second spouting port, and the inclined portion is provided on the downstream side of the protruding portion. In the present invention thus constituted, since the inner peripheral surface of the inner edge portion above the second spout is provided with the inclined portion inclined upward and inwardly of the bowl portion, the washing water that has flowed over the protruding portion but has not flowed down can flow down by the inclined portion.

[0019] According to the flush toilet of the present invention, it is possible to provide a flush toilet which can improve the waste discharge performance even if the water accumulation surface is formed larger and can fully clean the waste receiving surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a side cross-sectional view of the flush toilet according to the first embodiment of the present invention. Figure 2 It is a top view of the flush toilet according to the first embodiment of the present invention. Figure 3 It is along Figure 2 This is a cross-sectional view taken along line III-III. Figure 4A It is along Figure 2 A cross-sectional view taken along the IVA-IVA line. Figure 4B It is along Figure 2 A cross-sectional view taken along the IVB-IVB line. Figure 5 This is a diagram schematically showing the flow of flush water in the bowl portion during toilet flushing in the flush toilet according to the first embodiment of the present invention. Figure 6 It is a side view of the flush toilet according to the second embodiment of the present invention. Figure 7 It is along Figure 6 A cross-sectional view taken along line VII-VII. Figure 8 Yes Figure 7 FIG. 1 is a partial enlarged view showing an enlarged vicinity of a second spout port in a bowl portion of a flush toilet according to a second embodiment of the present invention. Fig.9A It is along Figure 8 A cross-sectional view of the IXA-IXA line for observation. Fig. 9B It is along Figure 8 A cross-sectional view taken along line IXB-IXB. Fig. 9C It is along Figure 8 A cross-sectional view of the IXC-IXC line for observation. Fig. 10A It is along Figure 8 A cross-sectional view taken along the XA-XA line. Fig. 10B It is along Figure 8 A cross-sectional view taken along the XB-XB line. Fig.11 It is a perspective view schematically showing the flow of flush water in the bowl of the flush toilet according to the second embodiment of the present invention. Explanation of symbols 1-Flush toilet of the first embodiment; 6-bowl; 10-drainage pipe; 10a-inlet of the drainage pipe; 14-waste receiving surface; 14a-rear area on the left side of the waste receiving surface; 14b-rear area on the right side of the waste receiving surface; 16-inner edge; 16a-inner peripheral surface of the inner edge; 18-tank; 20-first water spout; 22-second water spout; 30-connecting portion; 32-upward inclined portion; 32c-concave curved portion; 32d-convex curved portion; 34-horizontal portion; 36-downward inclined portion; F1-front mainstream; F2-rear mainstream; F3-longitudinal swirling water flow; W- Water accumulation surface; 1-flush toilet of the second embodiment; 14c-upper edge of the waste receiving surface; 14d-front end of the waste receiving surface; 16b-innermost end of the inner edge; 16c-lower end of the inner circumferential surface of the inner edge; 130-projection; 130a-innermost end of the projecting portion; 130b-upstream end of the projecting portion; 130c-downstream end of the projecting portion; 130d-bottom surface of the projecting portion; 140-inclined portion; 140a-inclined surface of the inclined portion; 140b-lower end of the inclined portion; 140c-innermost end of the inclined portion; D-projection amount of the projecting portion; Dmax-maximum projection amount of the projecting portion; R-radius of curvature. DETAILED DESCRIPTION

[0021] Next, a flush toilet 1 according to a first embodiment of the present invention will be described. Figure 1 and Figure 2 The basic structure of the flush toilet 1 will be described. Figure 1 is a side sectional view of a flush toilet according to a first embodiment of the present invention, Figure 2 It is a top view of the flush toilet according to the first embodiment of the present invention.

[0022] like Figure 1 and Figure 2As shown, the flush toilet 1 is a flush toilet that uses the flow of water formed by the drop of water in the bowl to flush away waste. The flush toilet 1 includes a toilet body 2 made of ceramic and a water storage tank 4 for storing washing water for washing the toilet body 2. The toilet body 2 is formed with a bowl 6 on its front side, and a common water conduit 8 connected to the water storage tank 4 is formed at the upper rear part of the bowl 6. In addition, a drainage pipe 10 for discharging waste is formed at the lower rear part of the bowl 6. In addition, although the flush toilet is described in the first embodiment of the present invention, the present invention is not limited to this, and the flush toilet of the present invention includes a siphon toilet that discharges waste using a siphon action.

[0023] Here, in this specification, the front of the flush toilet 1 when the user observes the flush toilet 1 from the front is referred to as the "front side", the back side is referred to as the "rear side", the right side is referred to as the "right side", the left side is referred to as the "left side", the front and rear direction of the flush toilet 1 is referred to as the "front and rear direction", the left and right direction is referred to as the "left and right direction", and the up and down direction is referred to as the "longitudinal direction", and the description is given accordingly.

[0024] The water storage tank 4 is provided with a drain valve 12 . The user can open the drain valve 12 by operating an operating lever (not shown) to supply the flushing water in the water storage tank 4 to the toilet body 2 . In addition, in the flush toilet of the present invention, in addition to the water storage tank 4, a direct pressure tap water or a flush valve may be used as a flush water source, and a pump may be used to supply flush water.

[0025] The bowl portion 6 includes: a bowl-shaped waste receiving surface 14; an inner edge portion 16 having an inner peripheral surface 16a that rises from the outer edge of the waste receiving surface 14 and is exposed to the outside; and a pool portion 18 formed below the waste receiving surface 14, and having a water accumulation surface W formed therein. Here, the water accumulation surface W of the pool portion 18 is roughly triangular in plan view, with a length of 160 mm to 180 mm in the front-to-back direction and 125 mm to 145 mm in the left-to-right direction, and is formed to be larger (enlarged) than the water accumulation surface of the existing flush type toilet. In addition, the pool portion 18 is roughly triangular in plan view, with a length of 200 mm to 240 mm in the front-to-back direction and 150 mm to 190 mm in the left-to-right direction, and is more oval (elliptical with a tapering front side) than the water accumulation surface W.

[0026] The pool portion 18 includes a bottom wall 18a forming a bottom surface, and side walls 18b extending upward from the outer edge of the bottom wall 18a in a substantially vertical manner and surrounding the water accumulation surface W from all sides. In this way, the pool portion 18 is formed into a shape like a pool by the bottom wall 18a and the side walls 18b, and water can be accumulated therein. In addition, the bottom wall 18a of the pool portion 18 includes a recessed portion 18c formed to be recessed downward, a front flat portion 18d formed on the front side of the recessed portion 18c and being a substantially flat surface, a side flat portion 18e formed on the left and right sides of the recessed portion 18c and being a substantially flat surface, and a protruding portion 18f formed at the lower rear side of the pool portion 18 and protruding toward the front.

[0027] A first water spouting port 20 for spouting washing water is formed on the inner edge 16 of the bowl 6 at a position on the left front of the bowl 6. In addition, a second water spouting port 22 for spouting washing water is formed at a position on the right rear of the bowl 6. The common water conduit 8 is branched into a first water conduit 24 and a second water conduit 26 toward the downstream side, the first water conduit 24 extends to the first water spouting port 20, and the second water conduit 26 extends to the second water spouting port 22, and washing water can be supplied from the water storage tank 4 to the first water spouting port 20 and the second water spouting port 22. Here, the first water spouting port 20 spouts water toward the front area of ​​the bowl 6, and the second water spouting port 22 spouts water toward the rear area of ​​the bowl 6. In addition, the first water spouting port 20 and the second water spouting port 22 spout washing water in a direction that can form a swirling flow swirling in the same direction. In the case of the first embodiment of the present invention, a swirling flow rotating counterclockwise is formed. In addition, in the first embodiment of the present invention, among the amounts of cleaning water supplied from the water storage tank 4 to the common water conduit 8, the ratio of the amount of cleaning water discharged from the first water discharge port 20 to the amount of cleaning water discharged from the second water discharge port 22 is approximately 6:4, which is more than the amount of cleaning water discharged from the second water discharge port 22 in the past. In addition, in the flush toilet of the present invention, the number of the water spouts may be two or more (for example, three).

[0028] The drainage pipe 10 includes an inlet 10a connected to the bottom wall 18a of the pool 18, an introduction pipe 10b extending from the inlet 10a to the rear and lower side, an ascending pipe 10c extending from the introduction pipe 10b to the rear and upper side, a descending pipe 10d extending from the ascending pipe 10c to the rear and lower side, and a top portion 10e located between the descending pipe 10d and the ascending pipe 10c to define the accumulated water level. The introduction pipe 10b is connected to the bottom wall 18a of the pool 18 to form a smooth continuous curved surface, so that the washing water flowing in from the inlet 10a can flow smoothly. Here, the lower end of the downcomer pipe 10d of the drainage pipe 10 is connected to a drainage pipe (not shown) through a drainage socket (not shown).

[0029] Next, use Figure 1 to Figure 3 The connection portion connecting the waste receiving surface 14 and the inner peripheral surface 16a of the inner edge portion 16 of the flush toilet 1 according to the first embodiment of the present invention will be described in detail. Figure 3 It is along Figure 2 This is a cross-sectional view taken along line III-III.

[0030] like Figure 1 As shown, the outer edge of the waste receiving surface 14 and the inner peripheral surface 16a of the inner edge portion 16 are connected by a connecting portion 30. The connecting portion 30 constitutes a boundary between the waste receiving surface 14 and the inner peripheral surface 16a of the inner edge portion 16. In a plan view, the connecting portion 30 is provided on substantially the entire circumference of the bowl portion 6 (see FIG. Figure 2 The connecting portion 30 is bent vertically upward from the outer edge of the waste receiving surface 14 . As a result, the inner peripheral surface 16 a of the inner edge portion 16 rises from the outer edge of the waste receiving surface 14 in a substantially vertical direction.

[0031] like Figure 3 As shown, the connecting portion 30 comprises, in the rear area of ​​the basin portion 6, an upward inclined portion 32 inclined upward toward the flow direction of the cleaning water swirling along the inner edge portion 16; a horizontal portion 34 extending approximately horizontally from the downstream end 32a of the upward inclined portion 32; and a downward inclined portion 36 inclined downward from the downstream end 34a of the horizontal portion 34 toward the flow direction of the cleaning water swirling along the inner edge portion 16.

[0032] The upward inclined portion 32 is inclined upward as a whole toward the flow direction of the washing water. Since the washing water flowing through the upward inclined portion 32 rises with the upward inclination, the flow velocity decreases due to pressure loss. As a result, a portion of the washing water ejected from the second water spouting port 22 flows down to the waste receiving surface 14 and directly flows into the water accumulation surface in the pool portion 18. The upstream end 32b of the upward inclined portion 32 is located near the second water spouting port 22 and is located in the second water conduit 26 upstream of the second water spouting port 22. In addition, the downstream end 32a of the upward inclined portion 32 is located in the center of the bowl portion 6 in the left-right direction.

[0033] like Figure 3As shown, the upward inclined portion 32 includes: a concave curved portion 32c, which is curved in a concave manner toward the bottom; and a convex curved portion 32d, which is located on the downstream side of the concave curved portion 32c and is curved in a convex manner toward the top. Since the concave curved portion 32c is concave toward the bottom, the washing water flowing through the concave curved portion 32c flows down from the concave curved portion 32c to the waste receiving surface 14. Since the convex curved portion 32d protrudes upward, the washing water flowing through the convex curved portion 32d is subjected to pressure loss and the flow velocity is reduced, and flows down to the waste receiving surface 14. In addition, the concave curved portion 32c is provided at a position closer to the second water spouting port 22, and the convex curved portion 32d is provided at a position farther from the second water spouting port 22.

[0034] The horizontal portion 34 is located at the highest position in the connection portion 30 and is formed substantially horizontally. The upstream end 34b of the horizontal portion 34 is located in the center of the bowl portion 6 in the left-right direction, and the downstream end 34a is located near the side wall 18b on the left side of the pool portion 18. The horizontal portion 34 is provided on the left side of the bowl portion 6 opposite to the second spout 22. Thus, the washing water having passed through the upward inclined portion 32 and having a reduced flow rate can be carried to the horizontal portion 34 and swirled along the inner edge portion 16.

[0035] The downward inclined portion 36 is inclined downward as a whole toward the flow direction of the washing water. Since the washing water flowing through the downward inclined portion 36 descends along the downward inclination, the flow velocity increases. As a result, the flow velocity of the washing water that has passed through the upward inclined portion 32 and whose flow velocity has decreased can be increased and caused to swirl along the inner edge portion 16. The upstream end 36a of the downward inclined portion 36 is located near the side wall 18b on the left side of the pool portion 18, and the downstream end 36b is located near the left end of the waste receiving surface 14.

[0036] Next, use Figure 4A and Figure 4B The waste receiving surface 14 in the rear region of the bowl 6 of the flush toilet 1 according to the first embodiment of the present invention will be described in detail. Figure 4A It is along Figure 2 The cross-sectional view of the IVA-IVA line, Figure 4B It is along Figure 2 A cross-sectional view taken along the IVB-IVB line.

[0037] like Figure 4A and Figure 4B As shown, in the rear area of ​​the bowl 6 (the area further back than the pool 18 and further forward than the inner edge 16), the height position of the waste receiving surface 14 is asymmetrical. The rear area 14b on the right side of the waste receiving surface 14 where the second water spout 22 is located is lower than the rear area 14a on the left side. Thus, a part of the washing water ejected from the second water ejection port 22 flows down from the relatively low right rear region 14 b and directly flows into the water storage surface in the pool portion 18 .

[0038] Next, use Figure 5 The flow of flush water in the bowl 6 during toilet flushing in the flush toilet 1 according to the first embodiment of the present invention will be described. Figure 5 This is a diagram schematically showing the flow of flush water in the bowl portion during toilet flushing in the flush toilet according to the first embodiment of the present invention.

[0039] like Figure 5 As shown, first, a part of the washing water discharged from the first water discharge port 20 forms a water flow f1 that swirls on the inner peripheral surface 16a of the inner edge portion 16, and at the same time, most of it flows down to the waste receiving surface 14 to form a front main flow F1. After flowing through the front side area of ​​the waste receiving surface 14 of the bowl portion 6, the front main flow F1 reaches the rear side area of ​​the waste receiving surface 14 and flows into the pool portion 18. On the other hand, a part of the washing water discharged from the second water discharge port 22 forms a water flow f2 that swirls on the inner peripheral surface 16a of the inner edge portion 16, and at the same time, most of it flows down to the waste receiving surface 14 to form a rear main flow F2. After flowing through the rear side area of ​​the waste receiving surface 14 of the bowl portion 6, the rear main flow F2 directly flows into the water accumulation surface W in the pool portion 18.

[0040] Next, part of the washing water flowing into the pool portion 18 collides with the front flat portion 18d, the side flat portion 18e or the protruding portion 18f in the pool portion 18 and changes into an upward flow, forming a vertically swirling water flow F3 with water momentum. As a result, waste is stirred in the pool 18 in the vertical direction together with the accumulated water, and is pressed into the inlet 10 a of the drainage pipe 10 . Furthermore, part of the washing water that has flowed into the pool 18 is collected in the recessed portion 18 c of the bottom wall 18 a of the pool 18 , and is pressed into the inlet 10 a of the drainage pipe 10 along the recessed portion 18 c . Thereby, the floating waste can be strongly pressed into the drainage pipe 10 .

[0041] Next, the effects of the above-mentioned first embodiment will be described. In the flush toilet 1 of the first embodiment of the present invention, since the waste receiving surface 14 and the inner peripheral surface 16a of the inner edge portion 16 are connected by the connecting portion 30, and the connecting portion 30 is provided in the rear area of ​​the bowl portion 6 with: an upward inclined portion 32, which is inclined upward toward the flow direction of the washing water swirling along the inner edge portion 16; and a downward inclined portion 36, which is located on the downstream side of the upward inclined portion 32 and is inclined downward toward the flow direction of the washing water, a part of the washing water ejected from the second water spouting port 22 flows down due to pressure loss due to flowing through the upward inclined portion 32, and flows into the water accumulation surface W of the pool portion 18 with good water momentum to form a longitudinal swirling water flow F3. Therefore, the waste discharge performance can be improved. On the other hand, the remaining washing water ejected from the second water spouting port 22 increases its flow rate due to flowing through the downward inclined portion 36, and swirls along the inner edge portion 16 with good water momentum. Therefore, the washing water can be spread over the entire waste receiving surface 14. Therefore, even if the water accumulation surface W is formed to be larger, the waste discharge performance can be improved and the waste receiving surface 14 can be fully cleaned.

[0042] In addition, in the flush toilet 1 of the first embodiment of the present invention, since the upward inclined portion 32 has a concave curved portion 32c that is curved in a manner concave toward the downward direction, and the downward inclined portion 36 has a convex curved portion 32d that is curved in a manner protruding toward the upward direction, a portion of the cleaning water ejected from the second water outlet 22 can flow downward by passing through the concave curved portion 32c of the upward inclined portion 32, and the remaining cleaning water can increase the flow rate by passing through the convex curved portion 32d of the downward inclined portion 36.

[0043] In the flush toilet 1 of the first embodiment of the present invention, since the upward inclined portion 32 has a convex curved portion 32d located on the downstream side of the concave curved portion 32c and curved in a manner protruding upward, a portion of the cleaning water ejected from the second water outlet 22 can flow downward due to pressure loss by flowing through the convex curved portion 32d of the upward inclined portion 32 and flow into the water accumulation surface W.

[0044] In the flush toilet 1 according to the first embodiment of the present invention, since the substantially horizontal horizontal portion 34 is provided between the ascending inclined portion 32 and the descending inclined portion 36 , the flush water having a reduced flow rate through the ascending inclined portion 32 can be carried to the horizontal portion 34 and swirled.

[0045] In the flush toilet 1 of the first embodiment of the present invention, since the horizontal portion 34 is arranged on one side (the left side) in the left-right direction of the bowl portion 6 on the opposite side of the second water spout 22, the cleaning water with a reduced flow rate flowing through the bowl portion 6 on the opposite side of the second water spout 22 can be carried into the horizontal portion 34 and swirled.

[0046] In addition, on the flush toilet 1 of the first embodiment of the present invention, since the height position of the waste receiving surface 14 is such that, in the rear area of ​​the bowl portion 6, the height position of the other side (the right side) of the bowl portion 6 in the left-right direction is lower than the height position of the one side (the left side) of the bowl portion 6 in the left-right direction, a portion of the cleaning water ejected from the second water spout 22 can flow down from the lowered waste receiving surface 14 and flow into the water accumulation surface W of the pool portion 18.

[0047] In the flush toilet 1 of the first embodiment of the present invention, since the upward slope 32 is located near the second spout 22, part of the flush water spouted from the second spout 22 can flow down earlier and form a vertical swirling water flow in the bowl 18 earlier.

[0048] Next, use Figure 6 to Figure 11 A flush toilet 100 according to a second embodiment of the present invention will be described. exist Figure 6 to Figure 11 In the flush toilet 100 according to the second embodiment of the present invention shown, the same components as those of the flush toilet 1 according to the first embodiment of the present invention described above are denoted by the same reference numerals, and description thereof will be omitted.

[0049] Figure 6 1 is a side view of a flush toilet 100 according to a second embodiment of the present invention. Figure 7 It is along Figure 6 The cross-sectional view observed along line VII-VII, Figure 8 Yes Figure 7 FIG. 1 is a partial enlarged view of the vicinity of the second spout port 22 in the bowl portion 6 of the flush toilet 100 according to the second embodiment of the present invention. Fig.9A It is along Figure 8 A cross-sectional view of the IXA-IXA line. Fig. 9B It is along Figure 8 The cross-sectional view of the IXB-IXB line, Fig. 9C It is along Figure 8 A cross-sectional view of the IXC-IXC line for observation. in addition, Figure 7 and Figure 8 The dotted line drawn on the inner side of the bowl 6 in the figure represents the innermost end 16b of the inner edge 16 (the upper opening of the bowl 6) when the flush toilet 100 is viewed from above. Figures 9A to 9C The cross-sectional view shows a cross section perpendicular to the flow direction of the washing water swirling on the inner peripheral surface 16 a of the inner edge portion 16 .

[0050] like Figure 6As shown, on the inner edge 16 of the bowl 6, as described above, a first water spouting port 20 for spouting washing water is formed at the left front position, and a second water spouting port 22 for spouting washing water is formed at the right rear position. Figure 7 As shown, an inner peripheral surface 16a extending upward from the upper edge 14c of the waste receiving surface 14 is formed on the inner edge portion 16 over substantially the entire circumference. The inner peripheral surface 16a of the inner edge portion 16 and the upper edge 14c of the waste receiving surface 14 together form a water conduit through which the cleaning water ejected from the first water spouting port 20 and the second water spouting port 22 flows. The cleaning water ejected from the first water spouting port 20 and the second water spouting port 22 flows in the same direction on the upper edge 14c and the inner peripheral surface 16a and forms a swirling flow.

[0051] like Figure 7 and Figure 8 As shown, on the inner peripheral surface 16a of the inner edge portion 16, a protrusion 130 ( Figure 7 and Figure 8 The protrusion 130 is located at the rear right side of the pool 18 in a top view of the bowl 16, and is located at the most downstream side of the inner peripheral surface 16a of the inner edge 16 from the first spout 20 to the second spout 22. With this structure, the washing water spouted from the first spout 20 swirls on the inner peripheral surface 16a of the inner edge 16, collides with the protrusion 130, and flows down toward the pool 18. The amount of washing water that collides with the protrusion 130 and flows down is about 30% of the total amount of water spouted from the first spout 20.

[0052] like Figures 9A to 9C As shown in FIG. 1 , the protrusion 130 is formed on the upper portion of the inner peripheral surface 16a (on the upper side than the center line that divides the inner peripheral surface 16a in the vertical direction). The protrusion 130 is not formed on the lower portion of the inner peripheral surface 16a (on the lower side than the center line that divides the inner peripheral surface 16a in the vertical direction), and the lower portion of the inner peripheral surface 16a extends in a substantially vertical direction. The protrusion 130 is connected to the inner peripheral surface 16a extending in the substantially vertical direction to form a smooth continuous curved surface.

[0053] like Figure 8 and Figures 9A to 9CAs shown in FIG. 1 , the protrusion 130 is formed so as to protrude toward the inner side (central side) of the bowl portion 16 as it goes upward. The protrusion amount D of the innermost end 130a of the protrusion 130 (the innermost end 16b of the inner edge portion 16) protruding toward the inner side of the bowl portion 16 relative to the lower end 16c of the inner peripheral surface 16a of the inner edge portion 16 is set so as to gradually increase toward the downstream side in the swirling direction of the washing water, and after reaching the maximum protrusion amount Dmax, gradually decrease toward the downstream side (refer to FIG. 1 ). Figure 8 ). In other words, the protrusion amount D is set to become smaller at the upstream end 130b and the downstream end 130c, and is set to be the maximum protrusion amount Dmax in the middle of the upstream end 130b and the downstream end 130c. The maximum protrusion amount Dmax of the protrusion 130 is set to be the largest in the inner peripheral surface 16a of the inner edge portion 16 in the rear area of ​​the bowl portion 6 (further to the rear than the center line that divides the bowl portion 6 into two equal parts in the front-to-back direction).

[0054] like Figures 9A to 9C As shown, the protrusion 130 has a bottom surface 130d facing downward. The bottom surface 130d is formed to face upward and be inclined toward the inner side of the bowl 6. In addition, the bottom surface 130d is formed in a curved arc shape. The bottom surface 130d of the protrusion 130 is formed from the upstream end 130b of the protrusion 130 to the downstream end 130c in the swirling direction of the washing water. The bottom surface 130d of the protrusion 130 is set so that its entire surface points to the water accumulation surface W in the pool 18. By making the washing water collide with such a bottom surface 130d, the flow direction of the washing water can be changed from the swirling direction to the downward direction. In the case of the flush toilet 100 of the second embodiment of the present invention, the bottom surface 130d is formed to be inclined upward and toward the inner side of the bowl, but it can also be formed to extend substantially horizontally. In the case of the flush toilet 100 of the second embodiment of the present invention, the bottom surface 130d is formed to be curved in an arc shape, but it can also be formed to extend in a straight line.

[0055] like Figure 7 As shown in FIG. 1 , the inner peripheral surface 16a of the inner edge portion 16 below the protrusion 130 is formed so that, in a plan view, the curvature radius R of the inner peripheral surface 16a of the inner edge portion 16 is the smallest in the entire circumference of the bowl portion 6. When the washing water flows through the inner peripheral surface 16a below the protrusion 130, the washing water is subjected to a relatively large pressure loss. As a result, the washing water flows in a longitudinal direction and collides with the bottom surface 130d of the protrusion 130.

[0056] like Figure 6As shown, the upper edge 14c of the waste receiving surface 14 gradually tilts upward from the front end 14d toward the rear protrusion 130. By allowing the washing water to flow through such an upper edge 14c, the washing water can be guided toward the protrusion 130. The washing water guided by the upper edge 14c collides with the bottom surface 130d of the protrusion 130.

[0057] Next, use Figure 7 , Figure 8 , Fig. 10A and Fig. 10B The structure around the second spout port 22 of the flush toilet 100 according to the second embodiment of the present invention will be described in detail. Fig. 10A It is along Figure 8 The cross-sectional view observed along the XA-XA line, Fig. 10B It is along Figure 8 A cross-sectional view taken along the XB-XB line.

[0058] like Fig. 10A and Fig. 10B As shown, an inclined portion 140 is formed on the inner peripheral surface 16a of the inner edge portion 16 above the second water spout 22, which is inclined upward and toward the inner side of the bowl portion 6. The inclined portion 140 is formed on the downstream side ( Figure 7 and Figure 8 The upstream end of the inclined portion 140 is continuously connected to the downstream end 130c of the protruding portion 130. Specifically, the inclined surface 140a of the inclined portion 140 and the bottom surface 130d of the protruding portion 130 are smoothly continuous without steps (see Fig.11 ).

[0059] The distance d from the lower end 140b of the inclined portion 140 to the innermost end 140c (the innermost end 16b of the inner edge portion 16) is set to be the largest on the upstream side and gradually decreases toward the downstream side in the swirling direction of the washing water (see FIG. Figure 8 With such a configuration, the washing water that has not flowed down over the protrusion 130 can be made to flow down by the inclined portion 140 .

[0060] Next, use Fig.11 The flow of flush water in the bowl 6 during toilet flushing in the flush toilet 100 according to the second embodiment of the present invention will be described. Fig.11 It is a perspective view schematically showing the flow of flush water in the bowl of flush toilet 100 according to the second embodiment of the present invention.

[0061] When washing starts, washing water f1 is discharged from the first water discharge port 20 toward the front of the bowl 6, and washing water is discharged from the second water discharge port 22 toward the rear of the bowl 6. A portion of the washing water f2 discharged from the second water discharge port swirls on the inner peripheral surface 16a of the inner edge portion 16, and most of the washing water f3 flows down on the waste receiving surface 14 and directly flows into the water accumulation surface W in the pool 18. The washing water f1 discharged from the first water discharge port 20 and the washing water f2 discharged from the second water discharge port 22 swirl in the same direction on the inner peripheral surface 16a of the inner edge portion 16 and the upper edge portion 14c of the waste receiving surface.

[0062] Since the washing water f1 discharged from the first water discharge port 20 flows on the upper edge portion 14c, it is guided to the protrusion 130, and the upper edge portion 14c is inclined upward from the front end 14d toward the rear protrusion 130. In addition, since the washing water f1 flows on the inner peripheral surface 16a of the inner edge portion 16 below the protrusion 130, it will be subjected to a relatively large pressure loss due to the inner peripheral surface 16a with the smallest curvature radius, so that part of the washing water flows in a manner of expanding in the longitudinal direction (f4). In addition, the remaining washing water f5 continues to swirl and merges with the washing water f2 discharged from the second water discharge port 22.

[0063] The cleaning water f4 extending longitudinally collides with the bottom surface 130d of the protrusion 130, and the flow direction is changed directly from the swirling direction to the downward direction (f6). The cleaning water f6 flows down toward the water accumulation surface W in the pool 18. In this way, since the flow direction is changed directly from the swirling direction to the downward direction by the bottom surface 130d of the protrusion 130, the water force of the cleaning water flowing down toward the water accumulation surface W in the pool 18 can be enhanced. In addition, the cleaning water f6 merges with the cleaning water f3 that flows directly into the water accumulation surface W in the pool 18 from the second water spout 22, and flows into the water accumulation surface W in the pool 18 as a stream. As a result, the force of pressing in the dirt can be enhanced.

[0064] Furthermore, the washing water f7 that has passed over the protruding portion 130 and has not flowed down flows down along the inclined surface 140 a of the inclined portion 140 formed above the second water discharge port 22 .

[0065] Next, the effects of the flush toilet 100 according to the second embodiment of the present invention described above will be described. First, according to the flush toilet 100 of the second embodiment of the present invention, a protrusion 130 protruding toward the inside of the bowl 6 is provided on the upper part of the inner peripheral surface 16a of the inner edge 16 near the upstream side of the second spout 22, and the protrusion 130 has a bottom surface 130d, and the bottom surface 130d is configured to change the flow direction of the washing water flowing through the inner peripheral surface 16a of the inner edge 16 to a downward direction, so that the flow direction can be directly changed to a downward direction by the bottom surface 130d of the protrusion 130, thereby enhancing the water force of the washing water flowing down toward the water accumulation surface W in the pool 18. As a result, the force for pressing in waste can be enhanced, and even if the water accumulation surface W is formed larger than before, the waste discharge performance can be improved.

[0066] According to the flush toilet 100 of the second embodiment of the present invention, the protrusion amount D of the innermost end 130a of the protrusion 130 protruding toward the inner side of the bowl 6 relative to the lower end 16c of the inner peripheral surface 16a of the inner edge portion 16 is set to increase toward the downstream side and then decrease, so that the protrusion 130 can be made less noticeable and the washing water swirling on the inner peripheral surface 16a of the inner edge portion 16 can collide with the protrusion 130 and flow down.

[0067] Furthermore, according to the flush toilet 100 of the second embodiment of the present invention, since the maximum protrusion amount Dmax of the protrusion 130 is set to be the largest in the inner peripheral surface 16a of the inner edge portion 16 in the rear area of ​​the bowl portion 6, the cleaning water swirling on the inner peripheral surface 16a of the inner edge portion 16 can reliably collide with the protrusion 130 and flow down.

[0068] According to the flush toilet 100 of the second embodiment of the present invention, since the inner peripheral surface 16a of the inner edge portion 16 below the protrusion 130 is formed so that the curvature radius R of the inner peripheral surface 16a in a plan view is the smallest in the entire circumference of the bowl portion 6, a relatively large pressure loss can be caused to the swirling washing water. As a result, the washing water can be expanded in the longitudinal direction and can collide with the protrusion 130.

[0069] In addition, according to the flush toilet 100 of the second embodiment of the present invention, since the upper edge 14c of the waste receiving surface 14 is inclined upward from its front end 14d toward the protrusion 130, the cleaning water swirling on the upper edge 14c of the waste receiving surface 14 can be guided toward the protrusion 130 and the cleaning water can be made to collide with the protrusion 130.

[0070] According to the flush toilet 100 of the second embodiment of the present invention, since an inclined portion 140 inclined upward and toward the inner side of the bowl 6 is provided on the inner peripheral surface 16a of the inner edge portion 16 above the second water spout 22, and the inclined portion 140 is provided on the downstream side of the protrusion 130, the cleaning water that has passed over the protrusion 130 and has not flowed down can flow down through the inclined portion 140.

[0071] The present invention is not limited to the above-described embodiments, and various changes and modifications can be made within the scope of the technical concept described in the scope of the claims.

Claims

1. A flush toilet that uses washing water supplied from a washing water source to discharge waste, characterized in that: have: The bowl portion includes a waste receiving surface, an inner edge portion, and a pool portion, wherein the waste receiving surface is bowl-shaped, the inner edge portion has an inner peripheral surface rising from the outer edge of the waste receiving surface, and the pool portion is formed below the waste receiving surface and has a water accumulation surface formed therein; a first water spouting port provided on the inner edge portion on one side in the left-right direction of the bowl portion, and spouting washing water along the inner peripheral surface of the inner edge portion to form a swirling flow; a second water spouting port provided on the inner edge portion on the other side of the bowl in the left-right direction, and spouting the washing water in the same direction as the swirling direction of the washing water spouted from the first water spouting port and toward the rear area of ​​the bowl; and a drainage pipeline connected to the bottom of the basin, The dirt receiving surface is connected to the inner circumferential surface of the inner edge portion by a connecting portion, and the connecting portion comprises, in the rear area of ​​the bowl portion, an ascending inclined portion, inclined upward toward the flow direction of the cleaning water swirling along the inner edge portion; and a descending inclined portion, located on the downstream side of the ascending inclined portion, inclined downward toward the flow direction of the cleaning water.

2. The flush toilet according to claim 1, characterized in that: The upward inclined portion includes a concave curved portion that is curved so as to be concave downward, and the downward inclined portion includes a convex curved portion that is curved so as to be convex upward.

3. The flush toilet according to claim 2, characterized in that: The upward inclined portion includes a convex curved portion that is located on the downstream side of the concave curved portion and is curved so as to protrude upward.

4. The flush toilet according to claim 1, characterized in that: A horizontal portion formed substantially horizontally is provided between the upward inclined portion and the downward inclined portion.

5. The flush toilet according to claim 4, characterized in that: The horizontal portion is provided on one side in the left-right direction of the bowl portion on the opposite side to the second spout port.

6. The flush toilet according to claim 1, characterized in that: The height position of the waste receiving surface is such that, in a rear area of ​​the bowl, the other side of the bowl in the left-right direction is lower than the one side of the bowl in the left-right direction.

7. The flush toilet according to claim 1, characterized in that: The upward inclined portion is located near the second water spouting port.

8. The flush toilet according to claim 1, characterized in that: A protrusion that protrudes toward the inside of the bowl is provided on an upper portion of the inner peripheral surface of the inner edge portion near the upstream side of the second spouting port. The protrusion has a bottom surface configured to change the flow direction of the washing water flowing along the inner peripheral surface of the inner edge portion to a downward direction.

9. The flush toilet according to claim 8, characterized in that: The amount of protrusion of the innermost end of the protrusion toward the inner side of the bowl portion relative to the lower end of the inner peripheral surface of the inner edge portion is set to increase toward the downstream side and then decrease.

10. The flush toilet according to claim 9, characterized in that: The maximum protrusion amount of the protrusion is set so as to be the largest on the inner peripheral surface of the inner edge portion in the rear region of the bowl portion.

11. The flush toilet according to claim 8, characterized in that: The inner peripheral surface of the inner edge portion below the protruding portion is formed so that the radius of curvature of the inner peripheral surface in a plan view is the smallest in the entire circumference of the bowl portion.

12. The flush toilet according to claim 11, characterized in that: The upper edge of the waste receiving surface is inclined upward from the front end thereof toward the protruding portion.

13. The flush toilet according to claim 8, characterized in that: An inclined portion that inclines upward and inwardly of the bowl portion is provided on the inner peripheral surface of the inner edge portion above the second spouting port, and the inclined portion is provided on the downstream side of the protruding portion.

14. The flush toilet according to claim 8, characterized in that: The bottom surface of the protruding portion is formed so that the entire surface thereof is directed toward the water accumulation surface in the pool portion.

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