JP2020200606A - Flush toilet bowl - Google Patents

Abstract

To provide a flush toilet bowl suppressed in splash of washing water outside a bowl part.SOLUTION: A flush toilet bowl 10 has a bowl part 20 having a water storing part 24. The bowl part 20 has: a water channel 25 provided above the water storing part 24 for flowing washing water swirling along an inner peripheral edge of the bowl part 20; and an overhang part 27 protruded toward a center side of the bowl 20 and covering an upper part of the water channel 25. The overhang part 27 satisfies either one of conditions that a protruding amount W at a front area 20A of the bowl part 20 is smaller than the protruding amount W at a side area 20B of the bowl part 20, and that the overhang part is provided in the side area 20B of the bowl part 20 and not provided in the front area 20A of the bowl part 20. The water channel 25 has, in the front area 20A of the bowl part 20, has a splash reducing form reducing splash of the washing water swirling along the inner peripheral edge of the bowl part 20.SELECTED DRAWING: Figure 5A

Description

The present disclosure relates to flush toilets.

Patent Document 1 discloses a conventional flush toilet bowl. This flush toilet is equipped with a toilet bowl. The toilet bowl portion has a rim water passage formed in the upper peripheral portion. The rim waterway has a shelf that gently slopes toward the center of the toilet bowl, a side wall that continuously rises to the outer periphery of the shelf, and an eave that extends inward from the upper end of the side wall and projects upward. It has a part. When the washing water flows through the rim water passage, it is possible to prevent the washing water from scattering to the outside by the side wall portion and the eaves portion.

Japanese Unexamined Patent Publication No. 2012-202143

In the flush toilet of Patent Document 1, the relationship between the amount of protrusion of the eaves and the shape of the rim water passage in each region of the toilet bowl is unknown. In this flush toilet, there is room for studying these relationships from the viewpoint of suppressing the washing water from scattering to the outside of the toilet bowl.

The present disclosure is a problem to be solved to provide a flush toilet in which splashes of washing water are suppressed from being scattered to the outside of the toilet bowl portion.

The flush toilet of the present disclosure includes a toilet bowl portion having a water reservoir portion, and the toilet bowl portion is provided above the water reservoir portion, and washing water swirling around the inner peripheral edge portion of the toilet bowl portion flows. It has a headrace and an overhang portion that protrudes toward the center side of the toilet bowl portion and covers the upper part of the headrace portion. The overhang portion has a protrusion amount in the front region of the toilet bowl portion. The headrace is provided so as to satisfy both the fact that it is smaller than the amount of protrusion in the lateral region of the toilet bowl portion and that it is provided in the lateral region of the toilet bowl portion and not in the front region of the toilet bowl portion. In the front region of the toilet bowl portion, the toilet bowl portion has a splash reduction shape that reduces splashes of washing water swirling around the inner peripheral edge portion of the toilet bowl portion.

It is a perspective view of the flush toilet with the toilet seat device of Embodiment 1 attached. It is a top view of the flush toilet of Embodiment 1. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. FIG. 2 is a cross-sectional view taken along the line IV-IV of FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2, which is a cross-sectional view of a headrace and an overhang portion in the front region of the toilet bowl portion. FIG. 2 is a cross-sectional view taken along the line BB of FIG. 2, which is a cross-sectional view of a headrace and an overhang portion in a lateral region of the toilet bowl portion. FIG. 2 is a cross-sectional view taken along the line CC of FIG. 2, which is a cross-sectional view of a headrace and an overhang portion in the rear region of the toilet bowl portion. It is explanatory drawing for demonstrating the flow of the flush water in the front region of the toilet seat part which looked at the flush toilet of Embodiment 1 from the rear obliquely above. It is sectional drawing of the flush toilet of another embodiment.

The first embodiment of the flush toilet of the present disclosure will be described with reference to the drawings. In the following description, when the flush toilet is viewed from the front, the front side is the front side and the back side is the rear side. The left-right direction and the up-down direction are the left-right direction and the up-down direction when the flush toilet is viewed from the front. The left side of FIG. 2 is the left side, and the right side is the right side. The right side of FIG. 3 is the front, the left side is the rear, the upper side of FIG. 3 is the upper side, and the lower side is the lower side.

<Embodiment 1>
The flush toilet 10 of the first embodiment is attached to the wall surface 100 as shown in FIG. The flush toilet 10 has a toilet seat device 90 attached above it. The toilet seat device 90 is a functional component and includes a functional portion 91 and a toilet seat portion 93. The functional unit 91 houses a local cleaning mechanism, a deodorizing mechanism, and the like (not shown) inside. Further, the functional portion 91 rotatably supports the toilet seat portion 93 in an upright state and a prone state. FIG. 1 shows the lying down state of the toilet seat portion 93. The toilet seat portion 93 is located above the toilet bowl portion 20 in a prone state.

As shown in FIGS. 2 and 3, the flush toilet 10 includes a toilet bowl portion 20, a water supply channel 50, a drainage channel 60, an upper surface portion 70, and a side wall portion 80. The toilet bowl portion 20 is open upward. The opening of the toilet bowl portion 20 has an oval shape that is long in the front-rear direction when viewed from above. In the following description, in the front-rear direction of the toilet bowl portion 20, when the distance between the front end position and the rear end position at the lower end of the standing surface 25A, which will be described later, is divided into four equal parts, the front 1/4 area is the front of the toilet bowl portion 20. It is referred to as region 20A.

The toilet bowl portion 20 has a bowl surface 21, a recess 23, a headrace 25, an overhang portion 27, a first spout 29, a second spout (spout) 30, and a guide portion 40. The pot surface 21 is formed in a mortar shape. The bowl surface 21 has a larger inclination angle toward the recess 23 than the front region 20A behind the toilet bowl portion 20. The filth received on the pot surface 21 is discharged through the recess 23 and the drainage channel 60 together with the washing water that flows down while swirling along the pot surface 21.

The recess 23 is formed below the pot surface 21. The recess 23 is arranged near the rear of the toilet bowl portion 20 and is connected to the drainage channel 60. The recess 23 has a water storage portion 24 for storing wash water. The recess 23 is continuously provided from the pot surface 21. The front wall of the recess 23 hangs in a shape that bends downward from the lower end of the pot surface 21. The rear wall of the recess 23 hangs down from the pot surface 21 in a form in which the inclination angle gradually increases.

As shown in FIGS. 3 and 4, the headrace 25 is configured so that the washing water swirling in the toilet bowl portion 20 flows. The headrace 25 is formed on the inner peripheral edge of the toilet bowl portion 20 over substantially the entire circumference. The headrace 25 has a standing surface 25A and an inclined surface 25B inclined downward from the lower end of the standing surface 25A toward the water reservoir 24. The standing surface 25A is a surface that rises in the vertical direction on the outer peripheral side of the headrace 25. The standing surface 25A guides the washing water that swirls in the toilet bowl portion 20. The standing surface 25A has a configuration in which the radius of curvature in a plan view is substantially constant in the front region 20A of the toilet bowl portion 20 (see FIG. 2). In the present application, "the radius of curvature is substantially constant" means that, for example, the change in the radius of curvature in the entire front region 20A of the toilet bowl portion 20 is within 20%. The inclined surface 25B is composed of shelf surfaces 26 on the left, right, and rear of the toilet bowl portion 20, and is composed of pot surfaces 21 in front of the toilet bowl portion 20. The shelf surface 26 has a smaller inclination angle toward the water storage portion 24 side than the pot surface 21, and gradually inclines downward and extends toward the water storage portion 24 side. On the inclined surface 25B, the shelf surface 26 and the pot surface 21 are continuously formed so that the inclination angle toward the water storage portion 24 side gradually changes.

The overhang portion 27 is formed on the opening edge of the toilet bowl portion 20 over substantially the entire circumference. The overhang portion 27 projects toward the center side of the toilet bowl portion 20 and covers the upper part of the headrace 25. The overhang portion 27 prevents the washing water or the like from going to the outside of the toilet bowl portion 20. In the present embodiment, the "center of the toilet bowl portion 20" is the center of the opening of the toilet bowl portion 20.

As shown in FIG. 2, the first spout 29 and the second spout 30 each open to the standing surface 25A. The first spout 29 is located on the left side of the toilet bowl portion 20, and the second spout 30 is located on the right side of the toilet bowl portion 20. The first spout 29 is formed in the upper part on the left side in the middle portion in the front-rear direction of the toilet bowl portion 20. The first water discharge port 29 is located at the downstream end of the first water discharge flow path 55 of the water supply channel 50 and opens toward the front. The first spout 29 discharges wash water that swirls in the toilet bowl portion 20 toward the front side. The second spout 30 is formed in the upper part on the right side behind the toilet bowl portion 20. The second spout 30 is located at the downstream end of the second spout 57 of the water supply channel 50 and opens toward the left. The second spout 30 discharges wash water toward the left rear and the left side. A part of the washing water is discharged in the same direction as the washing water swirling in the toilet bowl portion 20 and flowing. The second spout 30 is located at the downstream end of the flow of wash water that swirls in the toilet bowl portion 20. In the present application, the "downstream end of the flow of the washing water swirling in the toilet bowl 20" means that the flow direction of at least a part of the washing water swirling in the toilet bowl 20 is changed. , Means the position where the flow stops in the turning direction.

As shown in FIGS. 2 and 3, the water supply channel 50 is arranged in the upper rear part of the center of the left and right sides of the flush toilet 10, and the inflow port 51 at the upstream end opens rearward. The inflow port 51 of the water supply channel 50 is watertightly connected to the washing water supply pipe 101 drawn out to the wall surface 100 by a connecting member (not shown) so that the washing water does not leak. The water supply channel 50 has an introduction flow path 53 extending forward from the upstream end, and a first water discharge flow path 55 and a second water discharge flow path 57 branched at the downstream end of the introduction flow path 53. The first water discharge flow path 55 extends forward from the rear of the toilet bowl portion 20 toward the left. The downstream end of the first water discharge channel 55 communicates with the first water discharge port 29. The second water discharge flow path 57 is folded back at the right end portion from the rear to the right of the toilet bowl portion 20. The downstream end of the second water discharge channel 57 communicates with the second water discharge port 30.

The drainage channel 60 communicates with an inflow port 61 whose upstream end opens to the bottom surface of the recess 23. Further, the drainage channel 60 has an introduction flow path 63 extending downward on the rear side, an ascending flow path 65 extending continuously upward on the rear side to the downstream end of the introduction flow path 63, and a downstream of the ascending flow path 65. It has a descending flow path 67 which is continuously extended toward the lower rear side and is connected to the drain pipe 103 at the end. The downstream end of the descending flow path 67 is open to the rear, and is watertightly connected to the drainage pipe 103 drawn out to the wall surface 100 via a connecting member (not shown) or the like so that the drainage does not leak.

As shown in FIG. 2, the upper surface portion 70 has a rim portion 71 extending forward and both sides from the upper end edge portion of the toilet bowl portion 20, and a rear surface portion 73 extending rearward from the upper end edge portion of the toilet bowl portion 20. doing. The rim portion 71 has a U-shape in a plan view, and a toilet seat portion 93 in an inverted state is placed on the rim portion 71. The rear surface portion 73 has a rectangular shape in a plan view, and the functional portion 91 is placed above the rear surface portion 73.

As shown in FIGS. 3 and 4, the side wall portion 80 hangs down from the outer peripheral edge of the upper surface portion 70 so as to surround the toilet bowl portion 20 and the drainage channel 60, and is continuous from the front end portion to the left and right sides. The lower end of the drainage channel 60 is located slightly below the lower edge of the side wall 80. That is, in this flush toilet 10, since the side wall portion 80 is formed by a curved surface that is continuously curved from the front surface to the left and right side surfaces, most of the toilet bowl portion 20 and the drainage channel 60 cannot be visually recognized from the outside.

Subsequently, the configuration of the headrace 25 and the overhang portion 27 in each region of the toilet bowl portion 20 will be described with reference to FIGS. 5A, 5B, and 5C. 5A, 5B, and 5C are partial cross-sectional views of the toilet bowl portion 20 viewed by cutting in a vertical plane passing through the center of the toilet bowl portion 20. As shown in FIG. 5B, the lateral region 20B of the toilet bowl portion 20 is downstream of the flow of the washing water swirling in the toilet bowl portion 20 from the front region 20A, and is located on the side of the toilet bowl portion 20. Area to wash. This lateral region 20B is a region including a portion where the position of the standing surface 25A is located on the rightmost side and its vicinity. The rear region 20C of the toilet bowl portion 20 is a region located behind the toilet bowl portion 20 as shown in FIG. 5C. The rear region 20C is a region including a portion where the position of the standing surface 25A is located on the rearmost side and its vicinity.

In the headrace 25, the position of the corner between the standing surface 25A and the inclined surface 25B is defined as position P1, and the position of the corner between the standing surface 25A and the lower surface of the overhang portion 27 is defined as position P2. When the corner portion has an R shape, the central position of the R surface is specified as the position of the corner portion. The position P1 of the corner portion between the standing surface 25A and the inclined surface 25B corresponds to the position of the lower end of the standing surface 25A.

The protrusion amount W of the overhang portion 27 is a dimension in which the tip 27A of the overhang portion 27 protrudes toward the center of the toilet bowl portion 20 from the position P1 of the corner portion between the inclined surface 25B and the standing surface 25A in the horizontal direction. And. That is, the protrusion amount W of the overhang portion 27 is the dimension of the width in which the overhang portion 27 covers the inclined surface 25B.

The depth D from the upper end of the toilet bowl portion 20 to the lower end of the standing surface 25A is the depth dimension from the upper surface portion 70 to the position P1 of the corner portion between the inclined surface 25B and the standing surface 25A. This depth dimension determines the position of the central end of the toilet bowl 20 on the upper surface 70 in the cross section of the toilet bowl 20 when cut in a vertical plane passing through the center of the toilet bowl 20. Calculated as the upper end of 20.

The height H of the standing surface 25A is a dimension in the vertical direction between the position P1 of the corner located at the lower end of the standing surface 25A and the position P2 of the corner located at the upper end of the standing surface 25A.

The inclination angle θ of the inclined surface 25B toward the water reservoir 24 is an angle between the inclined surface 25B and the horizontal plane including the position P1 of the corner portion between the inclined surface 25B and the standing surface 25A.

In the overhang portion 27, the protrusion amount W in the front region 20A of the toilet bowl portion 20 is smaller than the protrusion amount W in the lateral region 20B of the toilet bowl portion 20. The protrusion amount W of the overhang portion 27 is smaller than the rear region 20C in the front region 20A. This protrusion amount W is smaller than the lateral region 20B in the rear region 20C. The protrusion amount W of the overhang portion 27 is the minimum in the front region 20A and the maximum in the side region 20B. When the protrusion amount W of the overhang portion 27 is small, the width of the rim portion 71 can be reduced in the front region 20A. Further, since the protrusion amount W of the overhang portion 27 is small, the cleanability of the headrace 25 is improved in the front region 20A. The protrusion amount W of the overhang portion 27 gradually changes in the region where the first spout port 29 and the second spout port 30 are not provided on the standing surface 25A. That is, the protrusion amount W of the overhang portion 27 gradually increases from the front region 20A toward the side region 20B. The standing surface 25A has a shape that is inclined toward the left side toward the rear from the rear side of the lateral region 20B to the guide portion 40. Therefore, the protrusion amount W of the overhang portion 27 becomes smaller toward the rear as the standing surface 25A tilts to the left.

The depth D from the upper end of the toilet bowl portion 20 to the lower end of the standing surface 25A is larger than the lateral region 20B in the front region 20A. This depth D is larger in the anterior region 20A than in the posterior region 20C. This depth D is equivalent in the lateral region 20B and the posterior region 20C of the toilet bowl portion 20. The depth D from the upper end of the toilet bowl portion 20 to the lower end of the standing surface 25A gradually changes in the circumferential direction of the toilet bowl portion 20. The upper surface of the toilet bowl portion 20 is a substantially horizontal surface. The wash water flowing through the headrace 25 flows at substantially the same height in the regions 20B and 20C of the toilet bowl portion 20, and flows at a height lower than the other regions 20B and 20C in the front region 20A of the toilet bowl portion 20. Become. The relationship between the regions 20A, 20B, 20C of the toilet bowl portion 20 and the height H of the standing surface 25A is almost the same as the relationship between the regions 20A, 20B, 20C of the toilet bowl portion 20 and the depth D. To. That is, the height H of the standing surface 25A is larger than the side region 20B in the front region 20A and larger than the rear region 20C in the front region 20A.

The inclination angle θ of the inclined surface 25B toward the water reservoir 24 is larger than that of the rear region 20C in the front region 20A. This inclination angle θ is larger than the lateral region 20B in the rear region 20C. The inclination angle θ of the inclined surface 25B toward the water storage portion 24 gradually changes in the circumferential direction of the toilet bowl portion 20. In the front region 20A, the inclination angle θ increases from the left side toward the center in the left-right direction, and decreases from the center in the left-right direction toward the right side. The inclination angle θ becomes maximum in the front region 20A, decreases from the front region 20A toward the side region 20B, and becomes minimum in the side region 20B. The inclination angle θ is equivalent to the right side on the left side of the toilet bowl portion 20.

The headrace 25 has a splash-reducing shape that reduces splashes of washing water swirling in the toilet bowl 20 in the front region 20A of the toilet bowl 20. The splash reduction shape is configured to include a concave curved surface portion 25C in which the inclined surface 25B is recessed downward toward the center of the front region 20A in the left-right direction and is inclined downward toward the rear (see FIG. 6). .. This portion 25C is a portion in which the inclination angle θ of the inclined surface 25B toward the water reservoir 24 is larger than the inclination angle θ in the lateral region 20B. Further, this portion 25C is a portion in which the depth D from the upper end of the toilet bowl portion 20 to the lower end of the standing surface 25A is larger than the depth D in the lateral region 20B. The splash reduction shape is not limited to the shape of this portion 25C, and is the overall shape of the headrace 25 including the above-mentioned configuration in which the radius of curvature of the standing surface 25A is substantially constant.

Next, a flow of washing water when flushing the flush toilet 10 having such a configuration is described.

When a flush toilet switch provided on a remote controller (not shown) is operated, the flush toilet 10 discharges water from the first spout 29 and the second spout 30 via the water supply channel 50. As a result, the flush toilet 10 performs toilet cleaning.

As shown in FIG. 2, the washing water discharged from the first spout 29 flows in the toilet bowl portion 20 in a counterclockwise direction along the headrace 25 of the toilet bowl portion 20. At this time, a part of the washing water flows down toward the recess 23 due to the inclination of the inclined surface 25B. The standing surface 25A has a configuration in which the radius of curvature in a plan view is substantially constant in the front region 20A of the toilet bowl portion 20. Therefore, the washing water that swirls while being guided by the standing surface 25A is located in the front region 20A of the toilet bowl portion 20 as compared with the case where the washing water has a standing surface whose radius of curvature becomes smaller toward the front end of the toilet bowl portion, for example. Turn smoothly. As shown in FIG. 6, the washing water flowing through the front region 20A of the toilet bowl portion 20 has a large inclination angle θ toward the reservoir portion 24 of the inclined surface 25B in the concave curved surface portion 25C, so that the water pool portion The amount of water flowing down to the 24 side increases. Therefore, in the front region 20A, the droplets generated by the washing water flowing through the headrace 25 colliding with the standing surface 25A are reduced. Further, the washing water flowing through the front region 20A of the toilet bowl portion 20 flows because the depth D from the upper end of the toilet bowl portion 20 to the lower end of the standing surface 25A increases in the concave curved surface portion 25C. The position is set to be a position separated downward from the upper end of the toilet bowl portion 20. Therefore, in the front region 20A, it is difficult for the generated droplets to reach the upper surface of the toilet bowl portion 20. Due to the synergistic effect of these actions, droplets in the front region 20A are reduced as compared with the configuration in which the portion 25C is not formed in the front region 20A. In this way, the wash water that has passed through the front region 20A flows toward the side region 20B.

In the lateral region 20B, since the protrusion amount W of the overhang portion 27 is large, the droplets adhere to the lower surface of the overhang portion 27 even when the washing water is splashed. The droplets adhering to the lower surface of the overhang portion 27 flow downward and fall into the toilet bowl portion 20. The washing water that passes through the lateral region 20B and flows toward the left rear collides with the guide portion 40 (see FIG. 2). Then, the direction in which the mainstream of the washing water flows changes to the left side due to the collision. The guide portion 40 is also provided below the overhang portion 27. The mainstream of the washing water that collides with the guide portion 40 is guided to the left side along the projecting direction of the guide portion 40. The washing water guided to the protruding end surface of the guide portion 40 flows down toward the rear region 23B of the recess 23 due to the inclination of the shelf surface 26 and the pot surface 21, and is introduced into the recess 23. That is, the guide portion 40 is discharged from the first spout port 29, and forms a flow of the wash water toward the rear region 23B of the recess 23 at the downstream end of the wash water that swirls in the toilet bowl portion 20.

A part of the washing water discharged from the second spout 30 toward the left side slightly rearward swirls along the shelf surface 26 and flows down to the front region of the recess 23. Further, a part of the washing water discharged from the second spout 30 toward the left side slightly rearward flows down toward the rear region 23B of the recess 23 due to the inclination of the shelf surface 26 and the pot surface 21. The washing water that has flowed into the recess 23 forms a flow toward the inflow port 61 of the drainage channel 60, and forms a flow of washing water that pushes filth or the like toward the inflow port 61 of the drainage channel 60. That is, the flush toilet 10 can satisfactorily discharge filth and the like even if the amount of washing water discharged from the first spout 29 and the second spout 30 is reduced.

As described above, the flush toilet 10 of the present embodiment includes a toilet bowl portion 20 having a water reservoir portion 24. The toilet bowl portion 20 is provided above the water reservoir portion 24, and has a headrace 25 through which washing water swirling around the inner peripheral edge of the toilet bowl portion 20 flows, and a headrace that protrudes toward the center side of the toilet bowl portion 20. It has an overhang portion 27 that covers the upper part of the 25. The overhang portion 27 satisfies that the protrusion amount W in the front region 20A of the toilet bowl portion 20 is smaller than the protrusion amount W in the lateral region 20B of the toilet bowl portion 20. The headrace 25 has a splash-reducing shape that reduces splashes of washing water that swirls around the inner peripheral edge of the toilet bowl 20 in the front region 20A of the toilet bowl 20.

According to the flush toilet bowl 10, in the lateral region 20B of the toilet bowl portion 20, the splash of the washing water is scattered to the outside of the toilet bowl portion 20 by securing the protruding amount W of the overhang portion 27. Can be suppressed. In addition, in the front region 20A of the toilet bowl portion 20, the headrace 25 has a droplet-reducing shape, so that even if the overhang portion 27 has a small protrusion amount W, the cleaning water is outside the toilet bowl portion 20. It is possible to suppress the scattering of the droplets. As a result, it is possible to provide a flush toilet 10 in which splashes of washing water are suppressed from being scattered on the outside of the toilet bowl portion 20.

In the present embodiment, the headrace 25 has a standing surface 25A and an inclined surface 25B inclined downward from the lower end of the standing surface 25A toward the water storage portion 24, and the splash reduction shape is the inclined surface 25B. The portion 25C in which the inclination angle θ toward the water reservoir 24 is larger than the inclination angle θ in the lateral region 20B is included. According to this configuration, in the front region 20A, the amount of water flowing down to the water reservoir 24 side increases, and it is possible to prevent droplets from being generated.

In the present embodiment, the headrace 25 has a standing surface 25A and an inclined surface 25B inclined downward from the lower end of the standing surface 25A toward the water storage portion 24, and the splash reduction shape is the toilet bowl portion 20. Includes a portion 25C in which the depth D from the upper end to the lower end of the standing surface 25A is larger than the depth D in the lateral region 20B. According to this configuration, in the front region 20A, the position where the washing water flows can be set to a position separated downward from the upper end of the toilet bowl portion 20, and the generated droplets do not easily reach the upper surface of the toilet bowl portion 20.

In the present embodiment, the standing surface 25A has a configuration in which the radius of curvature in a plan view is substantially constant in the front region 20A of the toilet bowl portion 20. According to this configuration, in the front region 20A of the toilet bowl portion 20, the washing water swirling in the toilet bowl portion 20 swirls smoothly, so that the splash of the washing water is scattered in the front region 20A of the toilet bowl portion 20. Can be suppressed.

In the present embodiment, the headrace 25 has a standing surface 25A and an inclined surface 25B inclined downward from the lower end of the standing surface 25A toward the water reservoir 24, and the inclined surface 25B is formed on the water reservoir 24. The inclination angle θ is larger than the rear region 20C of the toilet bowl portion 20 in the front region 20A of the toilet bowl portion 20 and larger than the lateral region 20B in the rear region 20C. According to the above configuration, since the inclination angle θ of the inclined surface 25B in the rear region 20C is smaller than the front region 20A of the toilet bowl portion 20 and larger than the side region 20B, the inclination angle θ from the inclined surface 25B in the rear region 20C of the toilet bowl portion 20 It is possible to balance the flow rate of the washing water flowing down and the flow rate of the washing water swirling on the inclined surface 25B.

In the present embodiment, the overhang portion 27 has a protrusion amount W smaller than the rear region 20C of the toilet bowl portion 20 in the front region 20A of the toilet bowl portion 20 and smaller than the lateral region 20B in the rear region 20C. According to the above configuration, since the protrusion amount W of the overhang portion 27 is larger in the rear region 20C than in the front region 20A, the overhang portion 27 causes the splash of the washing water to be scattered in the rear region 20C of the toilet bowl portion 20. Can be suppressed. According to the above configuration, since the protrusion amount W of the overhang portion 27 is smaller in the rear region 20C than in the lateral region 20B, the opening area of the toilet bowl portion 20 in the rear region 20C can be secured. In the configuration in which the functional parts such as the toilet seat device 90 are attached to the rear of the toilet bowl portion 20, it is possible to prevent the overhang portion 27 and the functional portion 91 from interfering with each other in the rear region 20C.

The present disclosure is not limited to the embodiments described above and in the drawings.

(1) Unlike the first embodiment, the toilet bowl portion does not have to be provided with the second spout. The toilet bowl portion may be provided with yet another spout.

(2) The first spout and the second spout may be formed in a place different from that of the first embodiment and in a place where a good flow of washing water can be formed in the toilet bowl portion.

(3) Unlike the first embodiment, the shelf surface may be provided in front of the toilet bowl portion. In addition, the configuration of the headrace can be changed as appropriate. In addition to the first embodiment, a splash-reducing shape of the headrace in the front region of the toilet bowl can be appropriately designed.

(4) In addition to the first embodiment, the splash reduction shape of the headrace can be appropriately designed. In the splash reduction shape, the inclination angle of the inclined surface toward the water reservoir is larger than the inclination angle in the lateral region, and the depth from the upper end of the toilet bowl portion to the lower end of the standing surface is larger than the depth in the lateral region. It may not be a configuration including a part. For example, the splash suppression shape may satisfy the above relationship only with one of the inclination angle of the inclined surface toward the water reservoir and the depth from the upper end of the toilet bowl portion to the lower end of the standing surface. .. For example, the splash suppression shape may be such that both the inclination angle of the inclined surface toward the water reservoir and the depth from the upper end of the toilet bowl portion to the lower end of the standing surface do not satisfy the above relationship. Examples of such a splash suppression shape include a shape of a standing surface and a shape in which the rising angle of the standing surface is appropriately designed.

(5) In addition to the first embodiment, the amount of protrusion of the overhang portion, the depth from the upper end of the toilet bowl portion to the lower end of the standing surface, the height of the standing surface, and the inclined surface in each region of the toilet bowl portion. The inclination angle toward the water reservoir can be set as appropriate.

(6) Unlike the first embodiment, the lateral region may be a region including a portion where the position of the standing surface is located on the leftmost side and its vicinity. For example, the position on the front side of the first spout of the first embodiment may be the lateral region.
(7) Unlike the first embodiment, in the configuration in which the standing surface is inclined inward as it goes upward and the configuration in which the standing surface is curved so as to be convex outward, the amount of protrusion of the overhang portion is large. The dimension can be from the outermost portion of the standing surface to the tip of the overhang portion. Even in this case, the amount of protrusion of the overhang is defined as the width of the overhang portion covering the inclined surface.

(8) In addition to the first embodiment, as shown in FIG. 7, in the flush toilet 110, the overhang portion 27 is provided in the lateral region 20B of the toilet bowl portion 20 and in the front region 20A of the toilet bowl portion 20. It may be satisfied that it is not provided. According to the flush toilet 110, in the lateral region 20B of the toilet bowl portion 20, by providing the overhang portion 27, it is possible to suppress the scattering of the washing water to the outside of the toilet bowl portion 20. In addition, in the front region 20A of the toilet bowl portion 20, even if the headrace 25 has a droplet reduction shape and the overhang portion 27 is not provided in the front region 20A of the toilet bowl portion 20, the toilet bowl It is possible to suppress the scattering of the washing water on the outside of the portion 20. As a result, it is possible to provide a flush toilet 110 in which splashes of washing water are suppressed from being scattered on the outside of the toilet bowl portion 20.

10 ... flush toilet, 20 ... toilet bowl, 20A ... front area, 20B ... side area, 20C ... rear area, 24 ... water reservoir, 25 ... headrace, 25A ... standing surface, 25B ... inclined surface, 25C ... part, 27 ... overhang part

Claims (7)

Equipped with a toilet bowl part with a water reservoir
The toilet bowl part
A headrace that is provided above the water reservoir and through which wash water that swirls around the inner peripheral edge of the toilet bowl flows.
It has an overhang portion that protrudes toward the center side of the toilet bowl portion and covers the upper part of the headrace.
The overhang portion is provided in the lateral region of the toilet bowl portion and that the amount of protrusion in the front region of the toilet bowl portion is smaller than the protrusion amount in the lateral region of the toilet bowl portion. Satisfy one of the things that is not provided in the front area,
The headrace is a flush toilet having a splash-reducing shape that reduces splashes of washing water that swirls around the inner peripheral edge of the toilet bowl in the front region of the toilet bowl. The flush toilet according to claim 1, wherein the headrace has a standing surface and an inclined surface inclined downward from the lower end of the standing surface toward the water reservoir. The flush toilet according to claim 2, wherein the splash-reducing shape includes a portion of the inclined surface having an inclination angle toward the water reservoir portion larger than the inclination angle in the lateral region. The splash-reducing shape according to any one of claims 2 to 3, wherein the depth from the upper end of the toilet bowl portion to the lower end of the standing surface includes a portion larger than the depth in the lateral region. Flush toilet. The flush toilet according to any one of claims 2 to 4, wherein the standing surface has a configuration in which the radius of curvature in a plan view is substantially constant in the front region of the toilet bowl portion. Claim that the inclination angle toward the water reservoir portion of the inclined surface is larger than the rear region of the toilet bowl portion in the front region of the toilet bowl portion and larger than the lateral region in the rear region. The flush toilet according to any one of claims 2 to 5. Claims 1 to 6 of the overhang portion, wherein the protruding amount is smaller than the rear region of the toilet bowl portion in the front region of the toilet bowl portion and smaller than the lateral region in the rear region. The flush toilet according to any one of the above.