Patent Application
20250075484
This application claims benefit of priority to Japanese Patent Application No. 2023-140357, filed on Aug. 30, 2023, and Japanese Patent Application No. 2023-156338, filed on Sep. 21, 2023, the entire contents of which are incorporated herein by reference.
The present invention relates to a flush toilet and, in particular, to a flush toilet for discharging waste with flush water supplied from a flush water supply source. Description of the Related Art
Conventionally, for example, as described in Japanese Patent Laid-Open No. 2021-71009, a flush toilet is known which includes: a waste receiving surface receiving waste; a rim formed above the waste receiving surface; a well portion that is formed below the waste receiving surface and in which a pooled water surface is formed; and a first spouting port and a second spouting port provided in the rim and forming a circulating flow.
In addition, in the flush toilet, the first spouting port is provided to the front of a bowl and the second spouting port is provided to the rear of the bowl. A part of flush water which is spouted from the second spouting port directly flows into the pooled water surface in the well portion, collides with a bottom wall of the well portion, and subsequently forms a flow which vertically circulates in the well portion. Accordingly, waste is pushed into a discharge conduit and drained. On the other hand, the remaining flush water which is spouted from the second spouting port circulates along the rim and flows down the waste receiving surface. Accordingly, waste adhered to the waste receiving surface is washed away.
In such a flush toilet, conceivably, the pooled water surface is increased than before in order to suppress adherence of waste by reducing the area of the waste receiving surface which is a dried surface.
However, with the flush toilet described in Japanese Patent Laid-Open No. 2021-71009 mentioned above, since forming the pooled water surface larger than before causes a flow that vertically circulates in the well portion to disperse, a vertically circulating flow which is sufficient for discharging waste cannot be formed even when causing flush water to directly flow into the pooled water surface in the well portion from the second spouting port. Accordingly, there is a problem in that waste and, in particular, floating waste floating on a surface of the pooled water surface cannot be sufficiently discharged.
On the other hand, while increasing a flow rate of the flush water which directly flows into the pooled water surface in the well portion from the second spouting port enables a force of the flow which vertically circulates in the well portion to be increased, there is a problem in that a reduction in the flush water which circulates along the rim prevents the waste receiving surface from being sufficiently flushed.
The present invention has been made in order to solve the problems described above and an object thereof is to provide a flush toilet which enables waste discharge performance to be improved and which is capable of sufficiently flushing a waste receiving surface even when a large pooled water surface is formed.
In order to achieve the object described above, the present invention provides a flush toilet for discharging waste with flush water supplied from a flush water supply source, the flush toilet including: a bowl including a bowl-shaped waste receiving surface, a rim having an inner circumference surface rising from an outer edge of the waste receiving surface, and a well portion that is formed below the waste receiving surface and inside which a pooled water surface is formed; a first spouting port provided on the rim on one side in a left-right direction of the bowl and spouting flush water along the inner circumference surface of the rim to form a circulating flow; a second spouting port provided on the rim on another side in the left-right direction of the bowl and spouting flush water toward a rear region of the bowl in a same direction as a circulating direction of the flush water that is spouted from the first spouting port; and a discharge conduit connected to a bottom portion of the bowl, wherein the waste receiving surface and the inner circumference surface of the rim are connected to each other by a connecting portion, and the connecting portion includes, in the rear region of the bowl, an upward sloped portion which is sloped upward in a flow direction of the flush water that circulates along the rim and a downward sloped portion which is positioned on a downstream side of the upward sloped portion and which is sloped downward in the flow direction of the flush water.
In the present invention configured in this manner, since the waste receiving surface and the inner circumference surface of the rim are connected to each other by the connecting portion and the connecting portion includes, in the rear region of the bowl, the upward sloped portion which is sloped upward in a flow direction of the flush water that circulates along the rim and the downward sloped portion which is positioned on a downstream side of the upward sloped portion and which is sloped downward in the flow direction of the flush water, a part of the flush water which is spouted from the second spouting port flows downward while sustaining a pressure loss by flowing in the upward sloped portion, swiftly flows into the pooled water surface of the well portion, and forms a vertically circulating flow. Therefore, waste discharge performance can be improved. On the other hand, the remaining flush water which is spouted from the second spouting port increases its flow velocity by flowing in the downward sloped portion and swiftly circulates along the rim. Therefore, the flush water can be spread over the entire waste receiving surface.
Consequently, even when a large pooled water surface is formed, waste discharge performance can be improved and the waste receiving surface can be sufficiently flushed.
In addition, in the present invention, preferably, the upward sloped portion includes a concave curved portion which is curved so as to be recessed downward and the downward sloped portion includes a convex curved portion which is curved so as to protrude upward.
In the present invention configured in this manner, since the upward sloped portion includes a concave curved portion which is curved so as to be recessed downward and the downward sloped portion includes a convex curved portion which is curved so as to protrude upward, a part of the flush water which is spouted from the second spouting port can flow downward by flowing in the concave curved portion of the upward sloped portion and the remaining flush water can increase its flow velocity by flowing in the convex curved portion of the downward sloped portion.
In the present invention, preferably, the upward sloped portion includes a convex curved portion which is positioned on a downstream side of the concave curved portion and which is curved so as to protrude upward.
In the present invention configured in this manner, since the upward sloped portion includes with a convex curved portion which is positioned on a downstream side of the concave curved portion and which is curved so as to protrude upward, a part of the flush water which is spouted from the second spouting port can flow downward while sustaining a pressure loss by flowing in the convex curved portion of the upward sloped portion and can flow into the pooled water surface of the well portion.
In addition, in the present invention, a horizontal portion formed substantially horizontally is provided between the upward sloped portion and the downward sloped portion.
In the present invention configured in this manner, since the horizontal portion formed substantially horizontally is provided between the upward sloped portion and the downward sloped portion, flush water which has passed through the upward sloped portion and of which the flow velocity has dropped can be placed on the horizontal portion to be circulated.
In the present invention, preferably, the horizontal portion is provided on one side in the left-right direction of the bowl on an opposite side to the second spouting port.
In the present invention configured in this manner, since the horizontal portion is provided on one side in a left-right direction of the bowl on an opposite side to the second spouting port, flush water that flows in the bowl on an opposite side to the second spouting port and of which the flow velocity has dropped can be placed on the horizontal portion to be circulated.
In addition, in the present invention, preferably, in a height position of the waste receiving surface, the another side in the left-right direction of the bowl is lower than the one side in the left-right direction of the bowl in a rear region of the bowl.
In the present invention configured in this manner, since the another side in the left-right direction of the bowl is lower than the one side in the left-right direction of the bowl in a rear region of the bowl in the height position of the waste receiving surface, a part of the flush water which is spouted from the second spouting port can flow downward from the waste receiving surface which is low and can flow into the pooled water surface of the well portion.
In the present invention, preferably, the upward sloped portion is positioned in a vicinity of the second spouting port.
In the present invention configured in this manner, since the upward sloped portion is positioned in a vicinity of the second spouting port, a part of the flush water which is spouted from the second spouting port can promptly flow downward and can promptly form a vertically circulating flow in the well portion.
In addition, in the present invention, preferably, a protruding portion protruding toward inside of the bowl is provided in an upper portion of the inner circumference surface of the rim in a vicinity of an upstream side of the second spouting port and the protruding portion includes a bottom surface configured to change a flow direction of flush water flowing over the inner circumference surface of the rim to a downward direction.
In the present invention configured in this manner, since the protruding portion protruding toward the inside of the bowl is provided in the upper portion of the inner circumference surface of the rim in a vicinity of the upstream side of the second spouting port and the protruding portion includes the bottom surface configured to change the flow direction of flush water flowing over the inner circumference surface of the rim to a downward direction, the flow direction can be directly changed to a downward direction with the bottom surface of the protruding portion and a force of the flush water which flows downward toward the pooled water surface in the well portion can be increased. As a result, a force which pushes waste can be increased and waste discharge performance can be improved even when the pooled water surface is formed larger than before.
In the present invention, preferably, an amount of protrusion by which an innermost end of the protruding portion protrudes toward the inside of the bowl relative to a lower end of the inner circumference surface of the rim is set so as to become larger toward the downstream side and subsequently become smaller.
In the present invention configured in this manner, preferably, since the amount of protrusion by which the innermost end of the protruding portion protrudes toward the inside of the bowl relative to the lower end of the inner circumference surface of the rim is set so as to become larger toward the downstream side and subsequently become smaller, the protruding portion can be made less conspicuous and, at the same time, flush water circulating on the inner circumference surface of the rim can be caused to collide with the protruding portion and flow downward.
In addition, in the present invention, preferably, a maximum amount of protrusion of the protruding portion is set so as to be maximized in the inner circumference surface of the rim in the rear region of the bowl.
In the present invention configured in this manner, since the maximum amount of protrusion of the protruding portion is set so as to be maximized in the inner circumference surface of the rim in the rear region of the bowl, the flush water circulating on the inner circumference surface of the rim can be reliably caused to collide with the protruding portion and flow downward.
In the present invention, preferably, the inner circumference surface of the rim below the protruding portion is formed such that a curvature radius of the inner circumference surface in a plan view is minimized in a whole circumference of the bowl.
In the present invention configured in this manner, since the inner circumference surface of the rim below the protruding portion is formed such that the curvature radius of the inner circumference surface in a plan view is minimized in the whole circumference of the bowl, a relatively large pressure loss can be imparted to the circulating flush water. As a result, the flush water can spread in a vertical direction and be caused to collide with the protruding portion.
In addition, in the present invention, preferably, a top edge portion of the waste receiving surface is sloped upward toward the protruding portion from a front end of the waste receiving surface.
In the present invention configured in this manner, since the top edge portion of the waste receiving surface is sloped upward toward the protruding portion from a front end of the waste receiving surface, flush water circulating in the top edge portion of the waste receiving surface can be guided toward the protruding portion and the flush water can be caused to collide with the protruding portion.
In the present invention, preferably, a sloped portion which is sloped upward toward the inside of the bowl is provided on the inner circumference surface of the rim above the second spouting port, and the sloped portion is provided on a downstream side of the protruding portion.
In the present invention configured in this manner, since the sloped portion which is sloped upward toward the inside of the bowl is provided on the inner circumference surface of the rim above the second spouting port, flush water having passed through the protruding portion without flowing downward can be caused to flow downward with the sloped portion.
With the flush toilet according to the present invention, a flush toilet which enables waste discharge performance to be improved and which is capable of sufficiently flushing a waste receiving surface even when a large pooled water surface is formed can be provided.
Hereinafter, a flush toilet 1 according to a first embodiment of the present invention will be described. First, a basic structure of the flush toilet 1 will be described with reference to
As shown in
While a washdown toilet will be described in the first embodiment of the present invention, the flush toilet according to the present invention is not limited thereto and includes siphon toilets which discharge waste using a siphon action.
In the present specification, the front of the flush toilet 1 when a user views the flush toilet 1 from the front will be described as a “front side”, the rear will be described as a “rear side”, a right side will be described as a “right side”, a left side will be described as a “left side”, a front-rear direction of the flush toilet 1 will be described as a “front-rear direction”, a left-right direction will be described as a “left-right direction”, and an up-down direction will be described as a “vertical direction”.
The reservoir tank 4 described above is equipped with a discharge valve 12, and when the user performs an opening operation of an operation lever (not illustrated), the discharge valve 12 opens and causes flush water in the reservoir tank 4 to be supplied to the toilet main body 2.
In the flush toilet according to the present invention, a tap water direct pressure-type flush water supply source or a flush water supply source using a flush valve may be used besides the reservoir tank 4 and, furthermore, flush water may be supplied using a pump.
The bowl 6 is equipped with a bowl-shaped waste receiving surface 14, a rim 16 which rises from an outer edge of the waste receiving surface 14 and which includes an externally-exposed inner circumference surface 16a, and a well portion 18 which is formed below the waste receiving surface 14 and which internally forms a pooled water surface W. In this case, the pooled water surface W of the well portion 18 has a substantially triangular shape in a plan view, a dimension of the pooled water surface W in the front-rear direction ranges from 160 mm to 180 mm and a dimension in the left-right direction ranges from 125 mm to 145 mm, and the pooled water surface W is formed larger (expanded) than a pooled water surface of a conventional washdown toilet. In addition, a dimension of the well portion 18 in the front-rear direction ranges from 200 mm to 240 mm and a dimension of the well portion 18 in the left-right direction ranges from 150 mm to 190 mm in a plan view, and the well portion 18 forms a substantially triangular shape which is more egg-shaped (a front-tapered elliptical shape) than the pooled water surface W.
The well portion 18 is equipped with a bottom wall 18a which forms a bottom surface and a side wall 18b which extends upward substantially vertically from an outer edge of the bottom wall 18a and which encloses the pooled water surface W from all directions. In this manner, the well portion 18 is formed in a pot-like shape by the bottom wall 18a and the side wall 18b and is capable of storing pooled water therein. In addition, the bottom wall 18a of the well portion 18 is equipped with a concave portion 18c which is formed so as to be recessed downward, a front flat portion 18d which is formed on a front side of the concave portion 18c and which is a substantially flat surface, a side flat portion 18e which is formed on both left and right sides of the concave portion 18c and which is a substantially flat surface, and a protruding portion 18f which is formed in a lower part to the rear of the well portion 18 and which protrudes forward.
A first spouting port 20 which spouts flush water is formed to the front on a left side of the bowl 6 in the rim 16 of the bowl 6. In addition, a second spouting port 22 which spouts flush water is formed to the rear on a right side of the bowl 6. The common water conduit 8 described above branches toward a downstream side to a first water conduit 24 and a second water conduit 26, the first water conduit 24 extends to the first spouting port 20, the second water conduit 26 extends to the second spouting port 22, and the common water conduit 8 supplies flush water to the first spouting port 20 and the second spouting port 22 from the reservoir tank 4. In this case, the first spouting port 20 is configured to spout water toward a front region of the bowl 6 and the second spouting port 22 is configured to spout water toward a rear region of the bowl 6. In addition, the first spouting port 20 and the second spouting port 22 are configured to spout flush water in an orientation which causes a circulating flow that circulates in a same direction to be formed. In the case of the first embodiment of the present invention, a counterclockwise circulating flow is formed. In addition, in the first embodiment of the present invention, a ratio of an amount of flush water which is spouted from the first spouting port 20 to an amount of flush water which is spouted from the second spouting port 22 in an amount of flush water supplied from the reservoir tank 4 to the common water conduit 8 is approximately 6:4 and a larger amount of flush water is spouted from the second spouting port 22 than before.
Note that the flush toilet according to the present invention may include two or more (for example, three) spouting ports.
The discharge conduit 10 is equipped with an inlet 10a which is connected to the bottom wall 18a of the well portion 18, an introduction conduit 10b which extends downward on a rear side from the inlet 10a, an ascending conduit 10c which extends upward on a rear side from the introduction conduit 10b, a descending conduit 10d which extends downward on a rear side from the ascending conduit 10c, and a top portion 10e which is positioned between the descending conduit 10d and the ascending conduit 10c and which regulates a pooled water level. The introduction conduit 10b is connected to the bottom wall 18a of the well portion 18 as a smooth continuous curved surface and is configured such that flush water flowed into the introduction conduit 10b from the inlet 10a smoothly flows along the introduction conduit 10b.
In this case, a lower end of the descending conduit 10d of the discharge conduit 10 is connected to a water discharge pipe (not illustrated) via a discharge socket (not illustrated).
Next, a connecting portion which connects the waste receiving surface 14 and the inner circumference surface 16a of the rim 16 of the flush toilet 1 according to the first embodiment of the present invention to each other will be described in detail with reference to
As shown in
As shown in
The upward sloped portion 32 is sloped upward in a flow direction of the flush water as a whole. Since the flush water which flows in the upward sloped portion 32 ascends an upward slope, a flow velocity of the flush water drops due to sustaining a pressure loss. Accordingly, a part of the flush water which is spouted from the second spouting port 22 flows down to the waste receiving surface 14 and directly flows into the pooled water surface in the well portion 18. An upstream end 32b of the upward sloped portion 32 is positioned in a vicinity of the second spouting port 22 in the second water conduit 26 which is on an upstream side of the second spouting port 22. In addition, the downstream end 32a of the upward sloped portion 32 is positioned at center in a left-right direction of the bowl 6.
As shown in
The horizontal portion 34 is positioned at a highest position in the connecting portion 30 and formed substantially horizontally. An upstream end 34b of the horizontal portion 34 is positioned at center in the left-right direction of the bowl 6 and the downstream end 34a of the horizontal portion 34 is positioned near a left-side side wall 18b of the well portion 18. The horizontal portion 34 is provided on a left side of the bowl 6 on an opposite side to the second spouting port 22. Accordingly, flush water which has passed through the upward sloped portion 32 and of which the flow velocity has dropped can be placed on the horizontal portion 34 to be circulated along the rim 16.
The downward sloped portion 36 is sloped downward in a flow direction of the flush water as a whole. Since the flush water which flows in the downward sloped portion 36 descends a downward slope, flow velocity of the flush water is to increase. Accordingly, the flow velocity of the flush water which has passed through the upward sloped portion 32 and of which the flow velocity has dropped can be increased and the flush water can be circulated along the rim 16. An upstream end 36a of the downward sloped portion 36 is positioned near a left-side side wall 18b of the well portion 18 and a downstream end 36b of the downward sloped portion 36 is positioned near a left end of the waste receiving surface 14.
Next, details of 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 with reference to
As shown in
Accordingly, a part of the flush water which is spouted from the second spouting port 22 flows down from the relatively-low right-side rear region 14b and directly flows into the pooled water surface in the well portion 18.
Next, a flow of flush water in the bowl 6 during a toilet flush in the flush toilet 1 according to the first embodiment of the present invention will be described with reference to
As shown in
On the other hand, a part of flush water spouted from the second spouting port 22 forms a flow f2 which circulates along the inner circumference surface 16a of the rim 16 while a majority of the flush water flows down to the waste receiving surface 14 and forms a rear main flow F2. After flowing in a rear region of the waste receiving surface 14 of the bowl 6, the rear main flow F2 directly flows into the pooled water surface W in the well portion 18.
Next, a part of the flush water having flowed into the well portion 18 collides with the front flat portion 18d, the side flat portion 18e, or the protruding portion 18f in the well portion 18, changes to a flow which is oriented upward, and forms a vertically circulating flow F3 with force.
Accordingly, waste is agitated in an up-down direction together with pooled water in the well portion 18 and is pushed into the inlet 10a of the discharge conduit 10.
In addition, a part of the flush water having flowed into the well portion 18 is collected in the concave portion 18c of the bottom wall 18a of the well portion 18 and pushed into the inlet 10a of the discharge conduit 10 along the concave portion 18c.
Accordingly, floating waste is forcefully pushed into the discharge conduit 10.
Hereinafter, operational effects produced by the first embodiment described above will be explained.
In the flush toilet 1 according to the first embodiment of the present invention, since the waste receiving surface 14 and the inner circumference surface 16a of the rim 16 are connected to each other by the connecting portion 30 and the connecting portion 30 includes, in the rear region of the bowl 6, the upward sloped portion 32 which is sloped upward in a flow direction of the flush water that circulates along the rim 16 and the downward sloped portion 36 which is positioned on the downstream side of the upward sloped portion 32 and which is sloped downward in the flow direction of the flush water, a part of the flush water which is spouted from the second spouting port 22 flows downward while sustaining a pressure loss by flowing in the upward sloped portion 32, swiftly flows into the pooled water surface W of the well portion 18, and forms the vertically circulating flow F3. Therefore, waste discharge performance can be improved. On the other hand, the remaining flush water which is spouted from the second spouting port 22 increases its flow velocity by flowing in the downward sloped portion 36 and swiftly circulates along the rim 16. Therefore, the flush water can be spread over the entire waste receiving surface 14.
Consequently, even when a large pooled water surface W is formed, waste discharge performance can be improved and the waste receiving surface 14 can be sufficiently flushed.
In addition, in the flush toilet 1 according to the first embodiment of the present invention, since the upward sloped portion 32 includes the concave curved portion 32c which is curved so as to be recessed downward and the downward sloped portion 36 includes the convex curved portion 32d which is curved so as to protrude upward, a part of the flush water which is spouted from the second spouting port 22 can flow downward by flowing in the concave curved portion 32c of the upward sloped portion 32 and the remaining flush water can increase its flow velocity by flowing in the convex curved portion 32d of the downward sloped portion 36.
In the flush toilet 1 according to the first embodiment of the present invention, since the upward sloped portion 32 includes the convex curved portion 32d which is positioned on a downstream side of the concave curved portion 32c and which is curved so as to protrude upward, a part of the flush water which is spouted from the second spouting port 22 can flow downward while sustaining a pressure loss by flowing in the convex curved portion 32d of the upward sloped portion 32 and can flow into the pooled water surface W.
In addition, in the flush toilet 1 according to the first embodiment of the present invention, since the horizontal portion 34 formed substantially horizontally is provided between the upward sloped portion 32 and the downward sloped portion 36, flush water which has passed through the upward sloped portion 32 and of which the flow velocity has dropped can be placed on the horizontal portion 34 to be circulated.
In the flush toilet 1 according to the first embodiment of the present invention, since the horizontal portion 34 is provided on one side (left side) in the left-right direction of the bowl 6 on the opposite side to the second spouting port 22, flush water flowing in the bowl 6 on the opposite side to the second spouting port 22 and of which the flow velocity has dropped can be placed on the horizontal portion 34 to be circulated.
In addition, in the flush toilet 1 according to the first embodiment of the present invention, since the another side (right side) in the left-right direction of the bowl 6 is lower than the one side (left side) in the left-right direction of the bowl 6 in a rear region of the bowl 6 in the height position of the waste receiving surface 14, a part of the flush water which is spouted from the second spouting port 22 can flow downward from the waste receiving surface 14 which is low and can flow into the pooled water surface W of the well portion 18.
In the flush toilet 1 according to the first embodiment of the present invention, since the upward sloped portion 32 is positioned in a vicinity of the second spouting port 22, a part of the flush water which is spouted from the second spouting port 22 can promptly flow downward and can promptly form a vertically circulating flow in the well portion 18.
Next, a flush toilet 100 according to a second embodiment of the present invention will be described with reference to
Note that in the flush toilet 100 according to the second embodiment of the present invention shown in
A dotted line drawn inside the bowl 6 in
As shown in
As shown in
As shown in
As shown in
As shown in
While the bottom surface 130d is formed so as to slope upward toward the inside of the bowl in the flush toilet 100 according to the second embodiment of the present invention, alternatively, the bottom surface 130d may be formed so as to extend substantially horizontally. In addition, while the bottom surface 130d is formed so as to curve in an arc shape in the flush toilet 100 according to the second embodiment of the present invention, alternatively, the bottom surface 130d may be formed so as to extend in a linear shape.
As shown in
As shown in
Next, a structure of a periphery of the second spouting port 22 of the flush toilet 100 according to the second embodiment of the present invention will be described in detail with reference to
As shown in
A distance d from a lower end 140b of the sloped portion 140 to an innermost end 140c of the sloped portion 140 (the innermost end 16b of the rim 16) is set so as to be maximized on an upstream side and gradually decrease toward a downstream side in the circulating direction of flush water (refer to
Next, a flow of flush water in the bowl 6 during a toilet flush in the flush toilet 100 according to the second embodiment of the present invention will be described with reference to
When a flush starts, flush water f1 is spouted from the first spouting port 20 toward the front of the bowl 6 and, at the same time, flush water is spouted from the second spouting port 22 toward the rear of the bowl 6. In the flush water which is spouted from the second spouting port 22, a part of flush water f2 circulates on the inner circumference surface 16a of the rim 16 while a majority of flush water f3 flows down to the waste receiving surface 14 and directly flows into the pooled water surface W in the well portion 18. The flush water f1 spouted from the first spouting port 20 and the flush water f2 spouted from the second spouting port 22 circulate on the inner circumference surface 16a of the rim 16 and on the top edge portion 14c of the waste receiving surface in a same direction.
Since the flush water f1 spouted from the first spouting port 20 flows on the top edge portion 14c which is sloped upward from the front end 14d toward the protruding portion 130 on a rear side, the flush water f1 is guided toward the protruding portion 130. In addition, since the flush water f1 flows on the inner circumference surface 16a of the rim 16 below the protruding portion 130, the flush water f1 sustains a relatively large pressure loss due to the inner circumference surface 16a with a minimum curvature radius and a part of the flush water flows while spreading in the vertical direction (f4). Furthermore, remaining flush water f5 continuously circulates and merges with the flush water f2 having been spouted from the second spouting port 22.
The flush water f4 having spread in the vertical direction collides with the bottom surface 130d of the protruding portion 130 and the flow direction directly changes from the circulating direction to downward (f6). The flush water f6 flows down toward the pooled water surface W of the well portion 18. In this manner, since the flow direction is directly changed from the circulating direction to the downward direction by the bottom surface 130d of the protruding portion 130, a force of the flush water flowing downward toward the pooled water surface W of the well portion 18 can be increased. In addition, the flush water f6 merges with the flush water f3 which directly flows into the pooled water surface W in the well portion 18 from the second spouting port 22 and flows into the pooled water surface W in the well portion 18 as a bundle of flows. As a result, a force which pushes waste can be increased.
In addition, flush water f7 having passed through the protruding portion 130 without flowing downward is made to flow downward by the sloped surface 140a of the sloped portion 140 which is formed above the second spouting port 22.
Next, operational effects of the flush toilet 100 according to the second embodiment of the present invention described above will be explained.
First, with the flush toilet 100 according to the second embodiment of the present invention, since the protruding portion 130 protruding toward the inside of the bowl 6 is provided in the upper portion of the inner circumference surface 16a of the rim 16 in a vicinity of the upstream side of the second spouting port 22 and the protruding portion 130 includes the bottom surface 130d configured to change the flow direction of flush water flowing over the inner circumference surface 16a of the rim 16 to a downward direction, the flow direction can be directly changed to a downward direction with the bottom surface 130d of the protruding portion 130 and a force of the flush water which flows downward toward the pooled water surface W in the well portion 18 can be increased. As a result, a force which pushes waste can be increased and waste discharge performance can be improved even when the pooled water surface W is formed larger than before.
With the flush toilet 100 according to the second embodiment of the present invention, since the amount of protrusion D by which the innermost end 130a of the protruding portion 130 protrudes toward the inside of the bowl 6 relative to the lower end 16c of the inner circumference surface 16a of the rim 16 is set so as to become larger toward the downstream side and subsequently become smaller, the protruding portion 130 can be made less conspicuous and, at the same time, flush water circulating on the inner circumference surface 16a of the rim 16 can be caused to collide with the protruding portion 130 and flow downward.
In addition, with the flush toilet 100 according to the second embodiment of the present invention, since the maximum amount of protrusion Dmax of the protruding portion 130 is set so as to be maximized in the inner circumference surface 16a of the rim 16 in the rear region of the bowl 6, the flush water circulating on the inner circumference surface 16a of the rim 16 can be reliably caused to collide with the protruding portion 130 and flow downward.
With the flush toilet 100 according to the second embodiment of the present invention, since the inner circumference surface 16a of the rim 16 below the protruding portion 130 is formed such that the curvature radius R of the inner circumference surface 16a in a plan view is minimized in the whole circumference of the bowl 6, a relatively large pressure loss can be imparted to the circulating flush water. As a result, the flush water can spread in a vertical direction and be caused to collide with the protruding portion 130.
In addition, with the flush toilet 100 according to the second embodiment of the present invention, since the top edge portion 14c of the waste receiving surface 14 is sloped upward toward the protruding portion 130 from the front end 14d of the waste receiving surface 14, flush water circulating in the top edge portion 14c of the waste receiving surface 14 can be guided toward the protruding portion 130 and the flush water can be caused to collide with the protruding portion 130.
With the flush toilet 100 according to the second embodiment of the present invention, since the sloped portion 140 which is sloped upward toward the inside of the bowl 6 is provided on the inner circumference surface 16a of the rim 16 above the second spouting port 22 and the sloped portion 140 is provided on the downstream side of the protruding portion 130, flush water having passed through the protruding portion 130 without flowing downward can be caused to flow downward with the sloped portion 140.
The present invention is not limited to the embodiments described above and various changes and modifications can be made within the scope of the technical ideas as set forth in the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023-140357 | Aug 2023 | JP | national |
| 2023-156338 | Sep 2023 | JP | national |
