JP7101038B2 - Toilet bowl body - Google Patents

Description

The present invention relates to a toilet bowl body.

Conventionally, various studies have been made on a cleaning method for discharging filth. In Patent Document 1, a swirling flow is formed in the lateral region on one side of the left and right sides of the toilet bowl portion toward the rear, and a part of the swirling flow is allowed to flow into the reservoir portion of the toilet bowl portion from the rear to drain the toilet bowl. A flush toilet that can form a guided flow to push filth into the entrance of the road is disclosed.

Japanese Unexamined Patent Publication No. 2016-89431

Consider the case where the washing water is made to flow into the water reservoir of the toilet bowl from the rear to form a guided flow that pushes the filth into the entrance of the toilet drainage channel. In this case, in order to obtain a good filth discharge capacity, it is preferable that the inflow amount of the washing water from the rear to the water reservoir can be increased. From this point of view, the present inventor has found that there is a new measure for improving the filth discharge capacity.

A certain aspect of the present invention has been made in view of such a problem, and one of the purposes thereof is a technique for improving the sewage discharge capacity in discharging sewage by using a water flow flowing into the water reservoir from the rear. Is to provide.

The first aspect of the present invention for solving the above-mentioned problems is a toilet bowl body. The toilet bowl main body of the first aspect has a pot-shaped sewage receiving surface, a stool bowl portion having a reservoir portion recessed downward from the lower end edge of the filth receiving surface, and drainage connected to the bottom of the stool bowl portion. By discharging the washing water from the first water discharge hole toward one side in the circumferential direction in the toilet bowl portion and the toilet bowl portion, the rear region of the filth receiving surface located behind the pool portion is formed in the circumferential direction. It is provided with a first water discharge portion that forms a water flow that propagates toward one side, and the pool portion flows into the pool portion from behind while in contact with a vertical wall surface provided on one side of the left and right sides of the pool portion. The sewage receiving surface is configured to form an induced flow that pushes sewage into the drainage portion, and the sewage receiving surface has a shelf surface for guiding the washing water discharged from the water discharge hole to one side in the circumferential direction. However, the shape of the cut surface of the toilet bowl portion along the radial direction is a flat surface, and the radial gradient of the shelf surface in the rear region is larger than that of the water reservoir portion. It is set to be larger than the radial gradient of the shelf surface in the lateral region of the waste receiving surface located on either the left or right side.

According to the first aspect, as compared with the case where the slope of the shelf surface in the rear region is made equal to or less than the slope of the shelf surface in the lateral region, a part of the washing water transmitted in the circumferential direction on the shelf surface in the rear region is used. It becomes easy to drain it to the reservoir part moderately. Therefore, the inflow amount of the washing water from the rear to the water reservoir can be increased, and the filth discharge capacity can be improved.

It is a perspective view of the toilet bowl main body of 1st Embodiment. It is a top view of the toilet bowl main body of 1st Embodiment. It is a side sectional view of the toilet bowl main body of 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line AA of FIG. It is a figure which shows a part of the BB line cross section of FIG. It is a figure which mainly shows a part of the end face of the CC line of FIG. It is an exploded perspective view of the toilet bowl main body of 1st Embodiment. FIG. 3 is a sectional view taken along line DD of FIG. It is a figure which shows a part of the EE line cross section of FIG. It is another plan view of the toilet bowl main body of 1st Embodiment. It is still another plan view of the toilet body of 1st Embodiment. It is an enlarged view of a part of FIG. It is a figure which mainly shows a part of the BB line end face of FIG. It is a figure which shows the flow of the washing water in the 1st stage. It is a figure which shows the flow of the washing water in the 2nd stage. It is another figure which shows the flow of the washing water in the 2nd stage. It is a graph which shows the gradient of the shelf surface of 1st Embodiment. It is a graph which shows the radius of curvature of the connecting surface of 1st Embodiment. It is an enlarged view of a part of FIG. 20 (a) is a sectional view taken along line FF of FIG. 3, FIG. 20 (b) is a sectional view taken along line GG of FIG. 3, and FIG. 20 (c) is an H-line of FIG. It is an H line sectional view.

Hereinafter, in the embodiments and modifications, the same components are designated by the same reference numerals, and duplicate description will be omitted. In each drawing, for convenience of explanation, some of the components are omitted as appropriate, and the dimensions of the components are appropriately enlarged or reduced. The drawings shall be viewed according to the orientation of the reference numerals. Unless otherwise specified, the term "contact" as used herein includes not only the case where the two mentioned parties come into direct contact, but also the case where they come into indirect contact via other members.

(First Embodiment)
First, the first device of the flush toilet bowl 10 of the first embodiment will be described. FIG. 1 is a perspective view of a toilet bowl body 12 used in the flush toilet bowl 10 of the first embodiment. FIG. 2 is a plan view of the toilet bowl main body 12. FIG. 3 is a side sectional view of the toilet bowl main body 12. FIG. 4 is a cross-sectional view taken along the line AA of FIG.

The flush toilet bowl 10 includes a toilet bowl main body 12 and a flush water supply device 14. As shown in FIG. 4, the washing water supply device 14 of the present embodiment is configured by using a water storage tank (not shown), a distributor 16, and the like.

The toilet bowl body 12 of the present embodiment is made of pottery, but may be made of resin or the like. The toilet bowl body 12 of this embodiment is a Western-style toilet bowl. The toilet body 12 of the present embodiment is a floor-standing type installed on the floor surface Fs (see FIG. 3) of the toilet room.

Hereinafter, the positional relationship of the components of the flush toilet bowl 10 will be described using three directions orthogonal to each other. This direction is the front-back direction X, the left-right direction Y, and the up-down direction Z of the toilet bowl main body 12. The front-back direction X and the left-right direction Y are horizontal directions, and correspond to the front-back and left-right of a seated person sitting in a normal posture on a toilet seat (not shown) attached to the toilet body 12. The vertical direction Z is the vertical direction.

Further, in the present specification, the positional relationship of the components of the flush toilet bowl 10 will be described using the circumferential direction and the radial direction of the toilet bowl portion 18 of the toilet bowl main body 12. Here, the "circumferential direction" refers to a direction in which the toilet bowl body 12 is viewed from above and orbits around the center Cp (see FIG. 2) of the upper end inner edge portion 18a of the toilet bowl portion 18. Further, the "diameter direction" means a direction orthogonal to the vertical straight line passing through the center Cp.

Refer to FIGS. 2 and 3. The toilet body 12 has a toilet bowl portion 18. The upper end inner edge portion 18a of the toilet bowl portion 18 is connected to the upper surface portion 20 of the toilet bowl main body 12, and a mounting hole 22 for mounting the toilet seat is provided at the rear portion of the upper surface portion 20.

The toilet bowl portion 18 includes a pot-shaped filth receiving surface 24 for receiving filth, and a water reservoir portion 26 that is recessed downward from the lower end edge of the filth receiving surface 24. The filth receiving surface 24 has a shape in which the radius of curvature in a plan view is minimized at the front end portion 24a.

The toilet bowl portion 18 has a left side portion 18b (first side portion) on the left side (right side of the paper in FIG. 2) and a right side portion 18c on the left and right other sides (left side of the paper surface in FIG. 2). (Second side area). The left side portion 18b is a part of the toilet bowl portion 18 arranged on one of the left and right sides with respect to the left and right center line Lc of the toilet bowl portion 18, and the right side portion 18c is the left and right other side with respect to the left and right center line Lc. It is a part of the toilet bowl portion 18 arranged on the side. The left-right center line Lc is a straight line that bisects the dimension of the inner surface portion of the toilet bowl portion 18 along the left-right direction Y and extends along the front-back direction X in a plan view.

As shown in FIG. 4, the toilet bowl main body 12 includes water discharge portions 28A and 28B for discharging wash water into the toilet bowl portion 18. The water discharge portions 28A and 28B have a first water discharge portion 28A having a first water discharge hole 30A formed in the right side portion 18c of the toilet bowl portion 18 and a second water discharge portion 28A formed in the left side portion 18b of the toilet bowl portion 18. A second spouting portion 28B having a spouting hole 30B is included. The first water discharge hole 30A and the second water discharge hole 30B of the present embodiment are formed behind the water reservoir portion 26 and behind the toilet bowl portion 18. The first water discharge hole 30A of the present embodiment is formed on the right side on the left and right sides of the water reservoir 26, and the second water discharge hole 30B of the present embodiment is formed on the left side on the left and right sides of the water reservoir 26. Will be done.

The first water discharge hole 30A is open toward the front, and the washing water is flushed in the toilet bowl portion 18 on one side in the circumferential direction (counterclockwise on the paper in FIG. 9, hereinafter simply referred to as counterclockwise). Spit out. The second water discharge hole 30B is open toward the right side, which is the other side of the left and right sides, and discharges the washing water into the toilet bowl portion 18 in the counterclockwise direction.

The first water discharge unit 28A has a first water passage 32A for supplying wash water to the first water discharge hole 30A. The second water discharge unit 28B has a second water passage 32B for supplying wash water to the second water discharge hole 30B. The first water passage 32A is provided in the right side portion of the toilet body 12, and the second water passage 32B is provided in the left side portion of the toilet body 12. Washing water is supplied from the washing water supply device 14 to the first water passage 32A and the second water passage 32B.

FIG. 5 is a diagram showing a part of the cross section taken along the line BB of FIG. FIG. 6 is a diagram mainly showing a part of the end face of the CC line of FIG. The toilet bowl portion 18 has a hanging wall portion 34 that hangs down from the upper end inner edge portion 18a of the toilet bowl portion 18. The inner peripheral surface of the hanging wall portion 34 is continuous downward from the upper end inner edge portion 18a of the toilet bowl portion 18 to the outer peripheral end portion 24b of the filth receiving surface 24. The inner peripheral surface of the hanging wall portion 34 is not provided with a horizontal plane in the range from the upper end inner edge portion 18a of the toilet bowl portion 18 to the outer peripheral end portion 24b of the filth receiving surface 24. This makes it easier to wipe the inner peripheral surface of the hanging wall portion 34 as compared with the case where the horizontal surface is provided on the inner peripheral surface of the hanging wall portion 34.

In the present embodiment, the inner peripheral surface of the hanging wall portion 34 is formed so as to extend radially inward from the upper end inner edge portion 18a toward the lower side. In addition to this, the inner peripheral surface of the hanging wall portion 34 may be formed in an overhang shape so as to extend radially outward from the upper end inner edge portion 18a toward the lower side.

As shown in FIG. 1, the hanging wall portion 34 of the present embodiment is provided over the entire circumference of the toilet bowl portion 18. The inner peripheral surface of the hanging wall portion 34 of the present embodiment is smoothly connected at locations other than the water discharge holes 30A and 30B in a range covering substantially the entire circumference. The hanging wall portion 34 may be provided at least in a range of at least half of the circumferential direction of the toilet bowl portion 18 over the entire circumferential direction. In addition to this, the hanging wall portion 34 may be provided at least in a large part of the circumferential direction of the entire circumference of the toilet bowl portion 18 in the circumferential direction. The majority here means, for example, a range of 80% or more of the entire circumference of the toilet bowl portion 18 in the circumferential direction.

Hereinafter, since the first water discharge unit 28A and the second water discharge unit 28B have many configurations in common, the common configuration will be described with reference to the drawings showing the first water discharge unit 28A. See FIGS. 5 and 6. The first water discharge hole 30A of the first water discharge portion 28A penetrates the hanging wall portion 34. The inner lower surface 30a of the first water discharge hole 30A smoothly connects the inner lower surface 32a of the first water passage 32A and the filth receiving surface 24 as the inner surface of the toilet bowl portion 18. The term "smoothly" as used herein means that the surface referred to is smooth without any irregularities or steps. The inner upper surface 30b of the first water discharge hole 30A is provided below the inner upper surface 32b of the first water passage 32A.

The hanging wall portion 34 has a first spouting hole 30A and a first hole forming portion 36A provided above the first spouting hole 30A. The inner peripheral surface of the first hole forming portion 36A is smoothly connected in the range from the upper end inner edge portion 18a of the toilet bowl portion 18 to the first water discharge hole 30A. The inner peripheral surface of the first hole forming portion 36A is smoothly connected to the inner peripheral surface of the first hole forming portion 36A and the other portion of the hanging wall portion 34 adjacent to both sides in the circumferential direction.

As a result, the inner peripheral surface of the first hole forming portion 36A of the hanging wall portion 34 forming the first water discharge hole 30A is provided at a position where the inner peripheral surface of the first hole forming portion 36A is smoothly connected to the upper end inner edge portion 18a of the toilet bowl portion 18. Therefore, as compared with the case where the wall portion forming the first water discharge hole 30A is arranged at a position deep from the upper end inner edge portion 18a of the toilet bowl portion 18, the hanging wall portion 34 together with the upper end inner edge portion 18a of the toilet bowl portion 18 The inner peripheral surface of the 1-hole forming portion 36A can be easily wiped, and good cleanability can be obtained.

Further, the size of the first water discharge hole 30A is smaller than that in the case where the upper end inner edge portion 18a of the toilet bowl portion 18 forms the first water discharge hole 30A, and good designability can be obtained. Further, as compared with the case where the upper end inner edge portion 18a of the toilet bowl portion 18 forms the first water discharge hole 30A, the washing water discharged from the first water discharge hole 30A is transmitted through the upper end inner edge portion 18a and the upper surface portion of the toilet bowl main body 12. It becomes easier to avoid the situation that is transmitted up to 20. Further, as compared with the case where the upper end inner edge portion 18a of the toilet bowl portion 18 forms the first water discharge hole 30A, the height of the washing water flowing in the toilet bowl portion 18 can be suppressed, and the splash of the washing water of the toilet bowl portion 18 can be suppressed. It becomes easier to avoid the situation of scattering to the outside.

From the viewpoint of obtaining the above effects, it is preferable to satisfy the following conditions. The height Ha of the first hole forming portion 36A of the hanging wall portion 34 is defined by the height from the upper end of the upper end inner edge portion 18a of the toilet bowl portion 18 to the inner upper surface 30b of the first water discharge hole 30A. Further, the height from the upper end of the upper end inner edge portion 18a of the toilet bowl portion 18 to the inner lower surface 30a of the first water discharge hole 30A is referred to as Hb. At this time, it is preferable that the height Ha of the first hole forming portion 36A of the hanging wall portion 34 is set to a size equal to or more than half of the height Hb. This condition was derived based on an experimental study by the present inventor. As a result, the inner peripheral surface of the first hole forming portion 36A of the hanging wall portion 34 becomes an appropriate size for wiping and cleaning, and the inner peripheral surface thereof becomes easier to wipe, and better cleaning performance can be obtained.

In addition, the size of the first water discharge hole 30A becomes smaller, and better design can be obtained. Further, it becomes difficult for the washing water discharged from the first water discharge hole 30A to be transmitted to the upper end inner edge portion 18a, and it becomes easier to avoid the situation where the washing water is transmitted to the upper surface portion 20 of the toilet bowl main body 12. Further, the height of the washing water flowing in the toilet bowl portion 18 can be further suppressed, and it becomes easier to avoid the situation where the washing water droplets are scattered to the outside of the toilet bowl portion 18.

Further, the inner lower surface 30a of the first water discharge hole 30A smoothly connects the inner lower surface 32a of the first water passage 32A and the filth receiving surface 24 as the inner surface of the toilet bowl portion 18. Therefore, the water in the first water passage 32A does not stay in the first water passage 32A, but easily flows through the inner lower surface 30a of the first water discharge hole 30A into the toilet bowl portion 18, and has good hygiene. can get.

Although the first water discharge unit 28A has been described in detail so far, the second water discharge unit 28B is also common in many respects. That is, the second water discharge hole 30B of the second water discharge portion 28B also penetrates the hanging wall portion 34. Although not shown, the inner and lower surfaces of the second water discharge hole 30B also smoothly connects the inner and lower surfaces of the second water passage 32B and the sewage receiving surface 24 of the toilet bowl portion 18. The hanging wall portion 34 has a second spouting hole 30B and a second hole forming portion 36B provided above the second spouting hole 30B. Since the second hole forming portion 36B has the same configuration as the first hole forming portion 36A, the description thereof will be omitted.

Next, other features of the flush toilet 10 will be described. FIG. 7 is an exploded perspective view of the toilet bowl main body 12. As shown in FIGS. 1, 5, and 7, in the toilet bowl main body 12 of the present embodiment, the upper surface side portions 38A and 38B and the toilet bowl side portion 40 below the upper surface side portions 38A and 38B are joined. It is composed. The upper surface side portions 38A and 38B and the toilet bowl side portion 40 are joined by adhesion or the like. The upper surface side portions 38A and 38B and the toilet bowl side portion 40 are semi-finished products of the toilet bowl main body 12 necessary for obtaining the toilet bowl main body 12 made of pottery, and are cast-molded products obtained by casting molding. The toilet bowl main body 12 of the present embodiment is obtained by joining the upper surface side portions 38A and 38B as cast molded products in an unfired state and the toilet bowl side portion 40, and then firing them.

The upper surface side portions 38A and 38B and the toilet bowl side portion 40 have a shape in which the toilet bowl main body 12 is divided. The upper surface side portions 38A and 38B are portions including at least a part of the upper surface portion 20 of the toilet bowl main body 12. The upper surface side portions 38A and 38B of the present embodiment include a first upper surface side portion 38A corresponding to the first water discharge portion 28A and a second upper surface side portion 38B corresponding to the second water discharge portion 28B. The toilet bowl side portion 40 is a portion below the upper surface side portions 38A and 38B of the toilet bowl body 12, and is a portion including most of the toilet bowl portion 18. Hereinafter, since the first upper surface side portion 38A and the second upper surface side portion 38B have many configurations in common, the common configuration will be described with reference to the drawing showing the first upper surface side portion 38A.

FIG. 8 is a sectional view taken along line DD of FIG. As shown in FIGS. 5 and 8, the boundary position between the upper surface side portions 38A and 38B and the toilet bowl side portion 40 divides the wall portion forming the water discharge portions 28A and 28B corresponding to the upper surface side portions 38A and 38B into upper and lower parts. It is set to the position to be. In FIG. 5 and the like, for convenience of explanation, the boundary position between the upper surface side portions 38A and 38B and the toilet bowl side portion 40 is shown by a two-dot chain line, but these do not have to appear in the appearance. The portions forming the water discharge holes 30A and 30B and the water passages 32A and 32B of the toilet bowl side portion 40 have a shape that is open to the upper side. The upper surface side portions 38A and 38B are arranged so as to close the water discharge holes 30A and 30B of the toilet bowl side portion 40 and the portions forming the water passages 32A and 32B from the upper side.

As shown in FIGS. 5, 7, and 8, the first upper surface side portion 38A has a first upper wall portion 42A constituting the inner upper surface portion 32b of the first water passage 32A and a first hole formation of the hanging wall portion 34. It has at least a first hanging side wall portion 44A constituting the portion 36A. The first upper wall portion 42A constitutes a part of the upper surface portion 20 of the toilet bowl main body 12. The first hanging side wall portion 44A constitutes the inner upper surface 30b of the first water discharge hole 30A. Both side portions 44a of the first hanging side wall portion 44A constitute the first hole forming portion 36A and other parts of the hanging wall portion 34 adjacent to both sides in the circumferential direction.

The toilet bowl side portion 40 has a pair of first side wall portions 46A constituting the inner side surface 32c of the first water passage 32A, and a first lower wall portion 48A constituting the inner lower surface 32a of the first water passage 32A. The pair of first side wall portions 46A has an entry side opening 50 forming the first water discharge hole 30A. The first lower wall portion 48A also constitutes the inner lower surface 30a of the first water discharge hole 30A.

FIG. 9 is a diagram showing a part of the cross section taken along the line EE of FIG. As shown in FIGS. 7 to 9, the first side wall portion 46A has a first step portion 52 and a second step portion 54 formed at a position lower than the upper surface 52a of the first step portion 52. The second step portion 54 is formed in the entrance side opening 50 of the first side wall portion 46A. The upper surface 52a of the first stage portion 52 and the upper surface 54a of the second stage portion 54 are formed at positions higher than the outer peripheral end portion 24b of the filth receiving surface 24. Each of the first stage portion 52 and the second stage portion 54 is formed at a position lower than the upper surface portion 20 of the toilet bowl main body 12.

The upper surface 52a of the first step portion 52 comes into contact with the side end portion of the first upper wall portion 42A of the first upper surface side portion 38A to support the first upper wall portion 42A. The upper surface 54a of the second step portion 54 comes into contact with both side portions of the first hanging side wall portion 44A of the first upper surface side portion 38A to support the first hanging side wall portion 44A.

The second step portion 54 has a side surface 54b that rises from the upper surface 54a of the second step portion 54. The second step portion 54 is formed so as to be recessed in the horizontal direction from the inner side surface of the first water passage 32A and the inner peripheral surface of the hanging wall portion 34. Both sides of the first hanging side wall portion 44A are in contact with the side surface 54b of the second step portion 54.

The effect of the above-mentioned flush toilet bowl 10 will be described. When not in contact with the toilet bowl side portion 40, the first hanging side wall portion 44A of the first upper surface side portion 38A is in a state of hanging from the first upper wall portion 42A. Therefore, when the first hanging side wall portion 44A of the first upper surface side portion 38A is in the unfired state, a downward force component is applied by its own weight, and there is a possibility that the first hanging side wall portion 44A extends downward.

In this respect, according to the present embodiment, the toilet bowl side portion 40 is in contact with the first hanging side wall portion 44A of the first upper surface side portion 38A and supports the first hanging side wall portion 44A. Therefore, the downward force component due to its own weight applied to the first hanging side wall portion 44A of the first upper surface side portion 38A can be transmitted to the toilet bowl side portion 40. As a result, when it is in the unfired state, the downward force component acting on the first hanging side wall portion 44A of the first upper surface side portion 38A can be reduced, and the situation where the first hanging side wall portion 44A is stretched can be avoided. Along with this, the first hanging side wall portion 44A of the first upper surface side portion 38A makes it easier to accurately obtain the first water discharge hole 30A having the desired shape.

Further, the first hanging side wall portion 44A of the first upper surface side portion 38A is in contact with the side surface 54b of the second step portion 54. Therefore, when the first upper surface side portion 38A is joined to the toilet bowl side portion 40, the contact between the first hanging side wall portion 44A of the first upper surface side portion 38A and the side surface 54b of the second step portion 54 causes the toilet bowl side portion. The relative movement of the first upper surface side portion 38A in the horizontal direction with respect to 40 can be restricted. Along with this, the positioning work of the first upper surface side portion 38A with respect to the toilet bowl side portion 40 becomes easy.

In addition to this, the contact between the first upper wall portion 42A of the first upper surface side portion 38A and the side surface 52b (see FIGS. 7 and 8) of the first step portion 52 is also horizontal to the toilet bowl side portion 40. The relative movement of the first upper surface side portion 38A in the direction can be restricted.

As a method for manufacturing the toilet bowl main body 12, there is a method in which the toilet bowl main body 12 is formed of a single cast-molded product obtained by cast molding, and a part of the cast-molded product is cut off to form water discharge holes 30A and 30B. When such a method is adopted, there is a problem that burrs are generated due to the excision of a part of the cast molded product, and the water discharge holes 30A and 30B having the desired shape cannot be formed accurately.

In this respect, when the toilet bowl main body 12 is composed of the upper surface side portions 38A and 38B and the toilet bowl side portion 40 as in the present embodiment, the water discharge holes 30A and 30B are formed by the upper surface side portions 38A and 38B and the toilet bowl side portion 40. Can be formed. Therefore, there is an advantage that the water discharge holes 30A and 30B having the desired shape can be formed accurately as compared with the method of forming the water discharge holes 30A and 30B by cutting a part of the cast molded product. In addition to this, the heights of the water passages 32A and 32B of the toilet bowl body 12 can be easily reduced as compared with the case where the toilet bowl main body 12 is configured by a single cast molded product. Along with this, there is also an advantage that the amount of water to be supplied into the water passages 32A and 32B in order to discharge the washing water from the water discharge holes 30A and 30B can be reduced.

Although the details of the configuration relating to the first upper surface side portion 38A have been described so far, the second upper surface side portion 38B is also common in many respects. That is, the second upper surface side portion 38B has a second upper wall portion 42B constituting the inner upper surface of the second water passage 32B and a second hanging side wall portion 44B constituting at least the second hole forming portion 36B of the hanging wall portion 34. And have.

The toilet bowl side portion 40 has a pair of second side wall portions 46B constituting the inner side surface 32c of the second water passage 32B, and a second lower wall portion 48B constituting the inner lower surface 32a of the second water passage 32B. The second side wall portion 46B also has a first step portion 52 and a second step portion 54, similarly to the first side wall portion 46A. Although not shown, the upper surface of the first step portion 52 comes into contact with the second hanging side wall portion 44B of the second upper surface side portion 38B to support the second hanging side wall portion 44B. Although not shown, the upper surface of the second step portion 54 comes into contact with the second hanging side wall portion 44B of the second upper surface side portion 38B to support the second hanging side wall portion 44B.

Next, the second device of the flush toilet bowl 10 will be described. Refer to FIGS. 2 and 3. In addition to the toilet bowl portion 18, the toilet bowl main body 12 includes a toilet bowl drainage channel 56 connected to the bottom of the toilet bowl portion 18. The toilet drainage channel 56 serves as a passage for filth and water discharged from the toilet bowl portion 18 to the sewage side water channel (not shown).

The water reservoir portion 26 forms the bottom portion of the toilet bowl portion 18 and has a bottomed shape. The water reservoir portion 26 has a bottom wall surface 26a and a plurality of vertical wall surfaces 26b to 26d rising from the bottom wall surface 26a. The entrance 56a of the toilet drainage channel 56 opens at the rear of the bottom wall surface 26a. Reservoir is stored in the reservoir 26.

On the standing walls 26b to 26d, the left standing wall 26b (first standing wall) provided on the left side (right side in the paper in FIG. 2) on the left and right sides of the water reservoir 26 and the left and right other sides of the water reservoir 26. The right side standing wall surface 26c (second standing wall portion) provided on the right side (left side in the paper of FIG. 2) is included. Further, the standing wall surfaces 26b to 26d include a rear side standing wall surface 26d provided on the rear side of the water reservoir portion 26. The left side standing wall surface 26b and the right side standing wall surface 26c have a shape that tapers toward the front in order to form a guided flow Fwf (see FIG. 15) described later, and the front end portions thereof are smoothly interposed through the first concave curved surface 26e. It is connected. The left side standing wall surface 26b of the present embodiment is smoothly connected to the rear side standing wall surface 26d via the second concave curved surface 26f. The right side standing wall surface 26c of the present embodiment is smoothly connected to the rear side standing wall surface 26d via the third concave curved surface 26g.

FIG. 10 is another plan view of the toilet bowl body 12. In a plan view, the filth receiving surface 24 overlaps the water reservoir 26 in the front-rear direction X and overlaps the rear side region 60 provided behind the water storage part 26 and the water storage part 26 and the rear side area 60 in the left-right direction Y. It has a pair of lateral regions 62A, 62B. Further, the filth receiving surface 24 has a front side region 64 which overlaps with the water storage portion 26 and the lateral regions 62A and 62B in the front-rear direction X and is provided in front of the water storage portion 26 in a plan view.

FIG. 11 is still another plan view of the toilet bowl body 12. The toilet bowl portion 18 has a shelf surface 66 for guiding the washing water discharged from the water discharge holes 30A and 30B so as to swirl along the inner peripheral surface of the toilet bowl portion 18. The shelf surface 66 of the present embodiment is formed so as to be connected to the inner and lower surfaces of the first water discharge hole 30A and to be connected to the inner and lower surfaces of the second water discharge hole 30B.

FIG. 12 is an enlarged view of a part of FIG. FIG. 13 is a diagram mainly showing a part of the end face of the BB line of FIG. As shown in FIGS. 11 to 13, the shelf surface 66 constitutes a part of a range extending inward in the radial direction from the outer peripheral end portion 24b of the dirt receiving surface 24. The shape of the shelf surface 66 as a cut surface along the radial direction of the toilet bowl portion 18 is a flat surface. 12 and 13 show the shape of the cut surface along the radial direction.

The shelf surface 66 is formed so as to be continuous from the rear side region 60 of the filth receiving surface 24 to the lateral regions 62A and 62B. The shelf surface 66 of the present embodiment is formed so as to be continuous from the rear side region 60 of the filth receiving surface 24 to each of the pair of lateral side regions 62A and 62B. The shelf surface 66 of the present embodiment is formed so as to protrude from the lateral regions 62A and 62B of the filth receiving surface 24 to the front region 64. The shelf surface 66 of the present embodiment is formed in the rear region 60 of the dirt receiving surface 24 over the entire range in the left-right direction X.

The shelf surface 66 of the present embodiment is not formed in front of the water reservoir 26 at a position overlapping the water reservoir 26 in the front-rear direction X in a plan view. In the front side region 64 of the filth receiving surface 24, a concave curved surface portion 68 that is recessed downward is provided in front of the water reservoir portion 26 at a position overlapping the water reservoir portion 26 in the front-rear direction X. As a result, the filth receiving surface 24 is configured to form a first shunt Fwb (see FIG. 15) as a water flow flowing from the front into the water reservoir portion 26 from the filth receiving surface 24, which will be described later.

The toilet bowl portion 18 has a connecting surface 70 that connects the shelf surface 66 and the vertical wall surfaces 26b to 26d of the water reservoir portion 26. The connecting surface 70 is a convex curved surface portion having a singular radius of curvature connected to the inner peripheral end 66a of the shelf surface 66 on the cut surface along the radial direction of the toilet bowl portion 18. The connecting surface 70 connected to the shelf surface 66 is provided at least in the rear region 60 of the dirt receiving surface 24. The connecting surface 70 of the present embodiment is provided so as to be continuous from the rear side region 60 of the filth receiving surface 24 to the lateral side regions 62A and 62B. The connecting surface 70 will also be provided in the lateral regions 62A and 62B of the dirt receiving surface 24. The connecting surface 70 of the present embodiment is formed in the rear region 60 of the dirt receiving surface 24 over the entire range in the left-right direction Y.

The cleaning method using the above-mentioned flush toilet bowl 10 will be described. The flush toilet bowl 10 of the present embodiment discharges filth by a flush-type cleaning method in which the filth is washed away by using the head of water. When the predetermined cleaning start condition is satisfied, the cleaning water supply device 14 performs a supply operation of supplying a predetermined amount of cleaning water to the water passages 32A and 32B. The cleaning start condition is that, for example, the cleaning water supply device 14 receives a cleaning start command through an operation of an operating member such as a lever or an electric device such as a remote controller or a smartphone.

FIG. 14 is a diagram showing how the washing water flows in the first stage. The first stage here means a stage at which the washing water begins to flow into the toilet bowl portion 18. In this figure, the flow direction of the washing water is indicated by an arrow.

The washing water is supplied from the washing water supply device 14 to the water discharge holes 30A and 30B through the water passages 32A and 32B, and is discharged from the water discharge holes 30A and 30B. The first water discharge portion 28A faces the filth receiving surface 24 forward at the right side portion 18c of the toilet bowl portion 18 by the washing water discharged from the first water discharge hole 30A, and passes through the front end portion 24a of the filth receiving surface 24. Then, the left side portion 18b of the toilet bowl portion 18 forms a first swirling flow Fwa toward the rear of the filth receiving surface 24. The first swirl flow Fwa is formed so as to pass through the shelf surface 66 when traveling through the lateral region 62B on the right side and the lateral region 62A on the left side of the dirt receiving surface 24. The first swirl flow Fwa is formed as the mainstream. As used herein, the term "mainstream" refers to a streak-like flow in which a part of the washing water is partially collected.

A part of the washing water forming the first swirling flow Fwa is divided into a first shunt flow Fwb at the front portion of the filth receiving surface 24 at the left side portion 18b of the toilet bowl portion 18. The first shunt Fwb is formed as a main stream that flows down from the filth receiving surface 24 toward the water reservoir 26 side.

A part Fwc of the first shunt current Fwa that is not divided into the first shunt Fwb at the left side portion 18b of the toilet bowl portion 18 and goes backward on the filth receiving surface 24 has a larger flow rate than the first shunt Fwb.

The second water discharge portion 28B discharges the washing water from the second water discharge hole 30B into a wide-angle range, so that the first water flow Fwd that flows into the water reservoir 26 from the rear and the filth receiving surface behind the first water flow Fwd. It forms a second water flow Fwe that travels counterclockwise through 24. The first water flow Fwd and the second water flow Fwe are formed as mainstreams. The flow rate of the first water flow Fwd is larger than that of the second water flow Fwe. When the first water flow Fwd does not merge with a part Fwc of the first swirling flow Fwa, it mainly flows into the water reservoir 26 from the rear at the left side portion 18b of the toilet bowl portion 18. At this time, the first water flow Fwd flows in from the rear of the water reservoir 26 in the left side portion 18b of the toilet bowl 18 from the flow rate flowing in from the rear of the water reservoir 26 in the right side portion 18c of the toilet bowl portion 18. It is formed so that the flow rate is high. At this time, the flow rate of the first water flow Fwd flowing from the rear of the water reservoir portion 26 in the right side portion 18c of the toilet bowl portion 18 may be zero.

FIG. 15 is a diagram showing how the washing water flows in the second stage. The second stage here means a stage after a lapse of time from the first stage. The flow of the first swirl flow Fwa and the first shunt flow Fwb is the same as in the first stage.

In the second stage, the first water flow Fwd and the second water flow Fwe formed by the washing water discharged from the second water discharge hole 30B merge with a part Fwc of the first swirl flow Fwa. As a result, the first water flow Fwd and the second water flow Fwe are located in the rear region 60 of the filth receiving surface 24 from the position where the first water flow Fwd and the second water flow Fwe flowed before merging with a part of the Fwc of the first swirling flow Fwa. It is formed so as to pass through a portion near the outer peripheral end portion 24b of the above.

At this time, both the first water flow Fwd and the second water flow Fwe are formed so as to travel in the counterclockwise direction along the rear region 60 of the filth receiving surface 24. The first spouting portion 28A and the second spouting portion 28B discharge the washing water from the first spouting hole 30A and the second spouting hole 30B, so that the first spouting portion 28A and the second spouting portion 28B travel counterclockwise through the rear region 60 of the filth receiving surface 24. It can be said that the water flow Fwd is formed. The first water flow Fwd is formed so as to travel counterclockwise along the shelf surface 66 and the connecting surface 70 in the rear region 60 of the filth receiving surface 24.

When the first water flow Fwd merges with a part Fwc of the first swirling flow Fwa, the right side portion 18c of the toilet bowl portion 18 mainly falls while contacting the right standing wall surface 26c of the water reservoir portion 26. Inflows backward into the water reservoir 26 at. At this time, the first water flow Fwd flows into the water reservoir 26 from the rear in the right side portion 18c of the toilet bowl 18 from the flow rate flowing into the water reservoir 26 from the rear in the left side portion 18b of the toilet bowl portion 18. It is formed so that the inflow flow rate is large. At this time, the flow rate of the first water flow Fwd flowing from the rear of the water reservoir portion 26 in the left side portion 18b of the toilet bowl portion 18 may be zero. This first water flow Fwd is the mainstream having the largest flow rate among the water flows flowing into the water reservoir 26 from the filth receiving surface 24.

FIG. 16 is another diagram showing how the washing water flows in the second stage. As shown in FIGS. 15 and 16, the first water flow Fwd flowing into the water reservoir 26 from the rear flows downward while being in contact with the right vertical wall surface 26c of the water reservoir 26. This first water flow Fwd turns upward and backward by colliding with the bottom wall surface 26a and the left standing wall surface 26b of the water reservoir 26, then rises in the water reservoir 26 and then descends due to its own weight. A guided flow Fwf that becomes a swirling flow is formed. This guided flow Fwf rises toward the rear in the water reservoir 26 and then descends, so that the flow is such that filth is pushed into the inlet 56a of the toilet drainage channel 56. In this way, the water reservoir 26 is configured to form an induced flow Fwf that pushes filth into the toilet drainage channel 56 by the flow that flows into the water reservoir 26 from behind while in contact with the right vertical wall surface 26c. ..

The first shunt Fwb flowing from the front into the above-mentioned water reservoir 26 joins the induced flow Fwf. As a result, the water force of the induced flow Fwf is amplified.

The second water flow Fwe travels in the rear side region 60 of the filth receiving surface 24 in the counterclockwise direction, and travels forward in the lateral region 62B on the right side of the filth receiving surface 24. The second water flow Fwe merges with the first swirling flow Fwa in the lateral region 62B on the right side of the filth receiving surface 24, and amplifies the water force of the first swirling flow Fwa.

In this way, the first water flow Fwd is formed so as to flow into the water reservoir 26 from the rear while contacting the right standing wall surface 26c of the water reservoir 26 after merging with a part Fwc of the first swirl flow Fwa. Will be done. As a result, the flow rate of the first water flow Fwd flowing in from the rear of the water reservoir 26 can be increased as compared with the case where the first swirl flow Fwa is not merged with a part of the Fwc, and the filth discharge capacity can be improved.

In particular, the first water flow Fwd is formed so as to flow into the water reservoir 26 from the rear even when it does not merge with a part Fwc of the first swirling flow Fwa. Therefore, when the first swirling flow Fwa merges with the first water flow Fwd, it is easy to change the flow direction so that the flow direction of the first swirling flow Fwa faces the water reservoir portion 26. Along with this, the ratio of the water flow flowing through the rear region 60 of the filth receiving surface 24 to the total flow rate of the first swirling flow Fwa without flowing into the water reservoir 26 from the rear is reduced, and the water flow rate is reduced by that amount. The ratio of the water flow flowing from the rear to the total flow rate of the first swirling flow Fwa can be increased. As a result, the flow rate of the first water flow Fwd flowing in from the rear of the water reservoir 26 can be further increased, and the filth discharge capacity can be further improved.

Here, in the flush toilet bowl 10 of the present embodiment, the following measures are taken in order to increase the flow rate of the first water flow Fwd flowing into the water reservoir 26 from the rear. FIG. 17 is a graph showing the gradient of the shelf surface 66 in the radial direction. Here, the "diameter gradient" means the gradient of the shelf surface 66 (hereinafter, also simply referred to as a gradient) at the cut surface along the radial direction of the toilet bowl portion 18. Positions A to C in FIG. 17 correspond to positions A to C in FIG.

As shown in FIGS. 11 to 13 and 17, the slope of the shelf surface 66 in the rear side region 60 is set to be larger than the slope of the shelf surface 66 in the lateral regions 62A and 62B. The slope of the shelf surface 66 of the present embodiment is set to be the largest at the position A overlapping the left and right center lines Lc of the toilet bowl portion 18 in a plan view. The slope of the shelf surface 66 is set to be continuously reduced as the distance from the position A overlapping the left and right center lines Lc in the circumferential direction. It can also be considered that the slope of the shelf surface 66 in the lateral regions 62A and 62B is set to be continuously reduced as the distance from the rear region 60 in the circumferential direction.

As a result, the shelf surface 66 of the rear area 60 is transmitted in the counterclockwise direction as compared with the case where the slope of the shelf surface 66 in the rear area 60 is made equal to or less than the slope of the shelf surface 66 in the lateral areas 62A and 62B. It becomes easy to drain a part of the washing water into the water reservoir 26 appropriately. Therefore, the inflow amount of the washing water from the rear of the water reservoir 26 can be increased, and the filth discharge capacity can be improved.

Further, since the washing water can be guided along the inner peripheral surface of the toilet bowl portion 18 by the shelf surface 66 of the rear side region 60, the dirt receiver of the right side side region 62B which is continuous in the counterclockwise direction with respect to the rear side region 60. An appropriate amount of washing water can be transmitted to the surface 24 as well. Therefore, it is possible to improve the cleaning ability of the filth receiving surface 24 in the lateral region 62B on the right side while increasing the inflow amount of the cleaning water from the rear to the water reservoir 26.

FIG. 18 is a graph showing the radius of curvature of the connecting surface 70 in the radial direction. Here, the "radius of curvature in the radial direction" means the radius of curvature at the cut surface of the toilet bowl portion 18 along the radial direction (hereinafter, also simply referred to as the radius of curvature). Positions A to E in FIG. 18 correspond to positions A to E in FIG.

As shown in FIGS. 11 to 13 and 18, the radius of curvature of the connecting surface 70 in the rear region 60 described above is set to be larger than the radius of curvature of the connecting surface 70 in the lateral regions 62A and 62B. The radius. The radius of curvature of the connecting surface 70 of the present embodiment is set to be the largest at the position A overlapping the left and right center lines Lc of the toilet bowl portion 18 behind the water reservoir portion 26 in a plan view. The radius of curvature of the connecting surface 70 is set so as to be continuously reduced as the distance from the position A overlapping the left and right center lines Lc in the circumferential direction. It can also be considered that the radius of curvature of the connecting surface 70 in the lateral regions 62A and 62B is set to be continuously reduced as the distance from the rear region 60 in the circumferential direction.

As a result, the diameter of the convex curved connecting surface 70 is formed as compared with the case where the radius of curvature of the connecting surface 70 in the rear region 60 is equal to or less than the radius of curvature of the connecting surface 70 in the lateral regions 62A and 62B. The range in the direction can be widened. Along with this, the amount of washing water passing over the connecting surface 70 in the rear region 60 can be increased, and the amount of washing water that can be flushed from the connecting surface 70 to the water reservoir portion 26 can be easily increased. As a result, the inflow amount of the washing water from the rear to the water reservoir 26 can be further increased, and the filth discharge capacity can be improved.

In order to increase the amount of wash water flowing into the water reservoir 26 from the rear, a concave curved surface is provided over a wide area of the rear region 60 of the filth receiving surface 24, and the concave curved surface causes the wash water to be washed in the water reservoir 26. Can be considered as a measure to induce. In this respect, according to the present embodiment, the rear region 60 of the filth receiving surface 24 is provided with a shelf surface 66 which is a flat surface and a connecting surface 70 having a convex curved surface, and water is accumulated at least by the gradient of the shelf surface 66. The amount of wash water flowing into the portion 26 from the rear can be increased. Therefore, in order to increase the inflow amount of the washing water from the rear to the water reservoir 26, it is not necessary to provide a concave curved surface over a wide range of the rear region 60 of the filth receiving surface 24. Along with this, the rear area 60 of the dirt receiving surface 24 can be easily wiped without being stuck, and good cleaning performance can be obtained.

In addition, the connecting surface 70 is provided so as to be continuous over the entire circumference around the water reservoir portion 26 in a plan view. The connecting surface 70 may not be connected to the inner peripheral end 66a of the shelf surface 66 except for the rear region 60. The radius of curvature of the connecting surface 70 is set to be the smallest at the position E overlapping the left and right center lines Lc of the toilet bowl portion 18 in front of the water reservoir portion 26 in a plan view.

Next, other features of the flush toilet 10 will be described. FIG. 19 is an enlarged view of a part of FIG. 4. The toilet bowl portion 18 constitutes an inner peripheral surface of the toilet bowl portion 18, is connected to the inner side surface 30c of the first water discharge hole 30A, and is a surface portion extending in the discharge direction Pa along the central axis Ld of the first water discharge hole 30A. Has 18d. The surface portion 18d of the present embodiment is composed of the above-mentioned hanging wall portion 34.

The line extending the central axis Ld of the first water discharge hole 30A in the discharge direction Pa in a plan view is referred to as an extension line Le. In the present embodiment, the extension line Le is provided so as to pass through a portion avoiding the water reservoir portion 26 in a plan view.

The surface portion 18d of the toilet bowl portion 18 is on the opposite side of the water reservoir portion 26 with the above-mentioned extension line Le sandwiched in a plan view from the inner surface surface 30c of the first water discharge hole 30A toward the discharge direction Pa (FIG. 19). It is formed so as to extend toward the left side of the paper. Such a surface portion 18d forms an obtuse angle portion 30d in a plan view with the inner surface surface 30c of the first water discharge hole 30A. The surface portion 18d is curved so as to move toward the discharge direction Pa, away from the above-mentioned extension line Le on the opposite side of the water reservoir portion 26, and then approach.

As a result, the washing water discharged from the first water discharge hole 30A becomes difficult to flow along the surface portion 18d of the toilet bowl portion 18 immediately after being discharged from the first water discharge hole 30A, and the water flows along the surface portion 18d. The flow rate can be suppressed. This advantage will be explained.

Consider the case where the second water flow Fwe merges with the above-mentioned extension line Le from the water reservoir portion 26 side with respect to the washing water discharged from the first water discharge hole 30A in a plan view. At this time, the washing water discharged from the first water discharge hole 30A is provided with a force component Fa that approaches the surface portion 18d of the toilet bowl portion 18 by merging with the second water flow Fwe. In this case, according to the present embodiment, the flow rate of water flowing along the surface portion 18d of the toilet bowl portion 18 can be suppressed. Therefore, even if a force component Fa that approaches the surface portion 18d of the toilet bowl portion 18 is applied, most of the washing water discharged from the first water discharge hole 30A vigorously collides with the surface portion 18d of the toilet bowl portion 18. It can be avoided and the generation of splashes can be suppressed.

20 (a) is a sectional view taken along line FF of FIG. 3, FIG. 20 (b) is a sectional view taken along line GG of FIG. 3, and FIG. 20 (c) is an H-line of FIG. It is an H line sectional view.

The present invention has been described above based on the embodiments. Next, a modification of each component will be described.

Although the example in which the toilet bowl main body 12 is a floor-standing type has been described, it may be a wall-mounted type. The water-washing toilet bowl 10 may be washed using a washing method other than the wash-off type. This cleaning method is, for example, a siphon method. The washing water supply device 14 is not particularly limited with respect to a specific example thereof. The wash water supply device 14 may be configured by using, for example, a flush valve or the like.

(Regarding the first device)
The height Ha of the hole forming portions 36A and 36B of the hanging wall portion 34 may be set to a size less than half of the above-mentioned height Hb.

The toilet body 12 may be made of a single cast-molded product without joining the upper surface side portions 38A and 38B and the toilet bowl side portion 40.

The hanging side wall portions 44A and 44B of the upper surface side portions 38A and 38B may be supported in contact with a portion different from the second stage portion 54 of the toilet bowl side portion 40. For example, the toilet bowl side portion 40 may be supported in contact with a portion connected to the outer peripheral end portion 24b of the filth receiving surface 24. The hanging side wall portions 44A and 44B of the upper surface side portions 38A and 38B do not have to be in contact with the side surface 54b of the second stage portion 54 of the toilet bowl side portion 40.

(Regarding the second device)
The toilet body 12 has only the first water discharge portion 28A and does not have to have the second water discharge portion 28B. In this case, the first water discharge portion 28A may form a water flow that propagates in the circumferential direction through the rear region 60 of the filth receiving surface 24 by the washing water discharged from the first water discharge hole 30A. This water flow is, for example, the above-mentioned first water flow Fwd. In this case, the position of the first water discharge hole 30A of the first water discharge portion 28A is not particularly limited. For example, the first water discharge hole 30A may be formed at a position of the second water discharge hole 30B in the embodiment.

The first water discharge hole 30A, the second water discharge hole 30B, the first swirl flow Fwa, the first shunt flow Fwb, the first water flow Fwd, the second water flow Fwe, the induced flow Fwf, etc. are opposite to the positions in the embodiment on the left and right. It may be provided at the position of. For example, the first water discharge portion 28A discharges the washing water from the first water discharge hole 30A into the toilet bowl portion 18 in the clockwise direction, so that the first water discharge portion 28A propagates in the rear region 60 of the filth receiving surface 24 in the clockwise direction. 1 Water flow Fwd may be formed. In this case, if the water reservoir 26 is configured to form an induced flow Fwf by the water flow flowing into the water reservoir 26 from the rear while contacting the left standing wall surface 26b on the left and right sides of the water reservoir 26. good.

The shelf surface 66 of the filth receiving surface 24 may be formed so as to be continuous from the rear side region 60 of the filth receiving surface 24 to any of the lateral regions 62A and 62B.

An example has been described in which the slope of the shelf surface 66 in the rear region 60 of the filth receiving surface 24 is set to continuously change in the circumferential direction of the toilet bowl portion 18. In addition to this, the slope of the shelf surface 66 in the rear region 60 may be changed stepwise in the circumferential direction of the toilet bowl portion 18, or may be set to be constant in the circumferential direction in the rear region 60. good. In any case, the slope of the shelf surface 66 in the rear side region 60 may be set to be larger than the slope of the shelf surface 66 in the lateral regions 62A and 62B. Further, the slope of the shelf surface 66 in the rear side region 60 is set to be larger than the slope of the shelf surface 66 in any of the lateral side regions 62A and 62B of the pair of lateral regions 62A and 62B. Just do it.

The connecting surface 70 of the rear region 60 of the filth receiving surface 24 may have a concave curved surface shape.

An example has been described in which the radius of curvature of the connecting surface 70 in the rear region 60 of the filth receiving surface 24 is set to continuously change in the circumferential direction of the toilet bowl portion 18. In addition to this, the radius of curvature of the connecting surface 70 in the rear region 60 may be changed stepwise in the circumferential direction of the toilet bowl portion 18, or may be set to be constant in the circumferential direction in the rear region 60. May be good. In any case, the radius of curvature of the connecting surface 70 in the rear region 60 may be set to be larger than the radius of curvature in the lateral regions 62A and 62B. Further, the radius of curvature of the connecting surface 70 in the rear region 60 is set to be larger than the radius of curvature of the connecting surface 70 in any of the pair of lateral regions 62A and 62B. You just have to.

The embodiments and modifications of the present invention have been described in detail above. The above-mentioned embodiments and modifications are merely specific examples for carrying out the present invention. The contents of the embodiments and modifications do not limit the technical scope of the present invention, and many of the components are changed, added, deleted, etc. within the range not deviating from the idea of the invention defined in the claims. The design can be changed. In the above-mentioned embodiment, the contents that can be changed in such a design are emphasized by adding notations such as "in the embodiment" and "in the embodiment", but the design is made even if the contents do not have such a notation. Changes are allowed. Any combination of the above components is also effective as an aspect of the present invention. The hatching attached to the cross section of the drawing does not limit the material of the object to which the hatching is attached.

Generalizing the inventions embodied by the above embodiments and modifications, it can be said that the inventions described in the following items are included.

(1st item)
Toilet bowl and
The toilet bowl portion is provided with a first spouting portion for discharging washing water from the first spouting hole toward one side in the circumferential direction.
The toilet bowl portion constitutes an inner peripheral surface of the toilet bowl portion, and has a surface portion extending from the inner side surface of the first water discharge hole in the discharge direction along the central axis of the first water discharge hole.
The surface portion is a toilet bowl body formed so as to extend from the inner surface of the first water discharge hole toward the discharge direction, sandwiching the central axis in a plan view, and extending toward the side opposite to the water reservoir portion.

By generalizing the invention embodied by the above embodiments and modifications, the following technical ideas are derived. Hereinafter, the aspects described in the problem to be solved by the invention will be described.

In the first aspect, the toilet body of the second aspect has a convex curved surface that connects the vertical wall surface of the water reservoir and the shelf surface and is connected to the shelf surface. The connecting surface may be provided at least in the rear region of the waste receiving surface.
According to this aspect, in order to increase the inflow amount of the washing water from the rear to the water reservoir portion, it is not necessary to provide a concave curved surface over a wide area in the rear region of the dirt receiving surface. Along with this, it becomes easier to wipe the rear area of the dirt receiving surface without sticking, and good cleaning performance can be obtained.

In the second aspect of the toilet body of the third aspect, the connecting surface is also provided in the lateral region of the filth receiving surface, and the radial radius of curvature of the connecting surface in the rear region is set. It may be set to be larger than the radial radius of curvature of the connecting surface in the lateral region.
According to this aspect, the radial range in which the convex curved connecting surface is formed is compared with the case where the radius of curvature of the connecting surface in the rear region is equal to or less than the radius of curvature of the connecting surface in the lateral region. Can be widened. Along with this, the amount of washing water passing over the connecting surface in the rear region can be increased, and the amount of washing water that can be poured from the connecting surface to the water reservoir portion can be easily increased. As a result, the inflow amount of the washing water from the rear of the water reservoir can be further increased, and the filth discharge capacity can be improved.

In any one of the first to third aspects, the toilet body of the fourth aspect is the first on the left and right sides of the toilet bowl portion by discharging the washing water from the first water discharge hole. It forms a first swirling flow that propagates backward through the side portion, has a second water discharge hole formed in the first lateral portion behind the reservoir portion, and has the circumferential direction in the toilet bowl portion. A second water discharge portion is provided to form a first water flow that flows into the pool portion from the rear by discharging the washing water from the second water discharge hole toward one side, and the first water flow is the first swirl. After merging with a part of the stream, it may be formed so as to flow into the reservoir portion from the rear while contacting the standing wall surface.
According to this aspect, the flow rate of the water flow flowing into the water reservoir from the rear can be increased, and the filth discharge capacity can be improved.

The toilet bowl body of the fifth aspect is a toilet bowl portion having a pot-shaped filth receiving surface, a toilet bowl portion having a water reservoir portion recessed downward from the lower end edge of the filth receiving surface, and a toilet bowl connected to the bottom portion of the toilet bowl portion. By discharging the washing water from the drainage channel and the first water discharge hole toward one side in the circumferential direction in the toilet bowl portion, the first swivel traveling backward along the first lateral portion on the left and right sides of the toilet bowl portion. It has a first water discharge portion that forms a flow and a second water discharge hole that is formed in the first lateral portion behind the reservoir portion, and is directed toward one side in the circumferential direction in the toilet bowl portion. It is provided with a second water discharge portion that forms a first water flow that flows into the pool portion from behind by discharging wash water from the second water discharge hole, and the pool portion is provided on one side of the left and right sides of the pool portion. The first water flow is configured to form a guided flow that pushes filth into the toilet drainage channel by the water flow that flows into the pool portion from behind while in contact with the standing wall surface provided in the toilet bowl. After merging with a part of the water, it is formed so as to flow into the water reservoir from the rear while contacting the standing wall surface.
According to this aspect, the flow rate of the water flow flowing into the water reservoir from the rear can be increased, and the filth discharge capacity can be improved.

In any one of the first to fifth aspects, the toilet bowl body of the sixth aspect constitutes the inner peripheral surface of the toilet bowl portion, and the first water discharge from the inner surface of the first water discharge hole. It has a surface portion extending in the discharge direction along the central axis of the hole, and the surface portion sandwiches an extension line of the central axis in a plan view from the inner surface of the first water discharge hole toward the discharge direction. It may be formed so as to extend toward the side opposite to the water reservoir.
According to this aspect, it is considered that the washing water discharged from the first water discharge hole is subjected to a force component that approaches the surface portion of the toilet bowl portion by merging with another water flow. In this case, it is possible to avoid a situation in which most of the washing water discharged from the first water discharge hole vigorously collides with the surface portion of the toilet bowl portion, and the generation of droplets can be suppressed.

12 ... Toilet bowl body, 18 ... Toilet bowl part, 24 ... Sewage receiving surface, 26 ... Reservoir part, 26b-26d ... Standing wall surface, 28A ... 1st water discharge part, 28B ... 2nd water discharge part, 30A ... 1st water discharge hole , 30B ... second spout hole, 30c ... inner surface, 56 ... toilet drainage channel, 60 ... rear area, 62A, 62B ... lateral area, 66 ... shelf surface, 70 ... connecting surface.

Claims (4)

A pot-shaped filth receiving surface and a toilet bowl portion having a water reservoir portion that is recessed downward from the lower end edge of the filth receiving surface.
Toilet bowl drainage channel connected to the bottom of the toilet bowl
By discharging the washing water from the first water discharge hole into the toilet bowl portion toward one side in the circumferential direction, the rear region of the filth receiving surface located behind the water reservoir portion is set to one side in the circumferential direction. It is equipped with a first water discharge part that forms a water flow that travels toward.
The water reservoir is configured to form an induced flow that pushes filth into the toilet drainage channel by the water flow that flows into the water reservoir from behind while contacting the standing wall surface provided on one side of the left and right sides of the water reservoir. Being done
The filth receiving surface has a shelf surface for guiding the washing water discharged from the water discharge hole to one side in the circumferential direction.
The shape of the shelf surface as a cut surface along the radial direction of the toilet bowl portion is a flat surface.
The radial gradient of the shelf surface in the rear region is larger than the radial gradient of the shelf surface in the lateral region of the filth receiving surface located on either the left or right side of the water reservoir. Set to
The filth receiving surface has a convex curved surface-shaped connecting surface that connects the vertical wall surface of the water reservoir and the shelf surface and is connected to the shelf surface.
The connecting surface is provided in the front side region of the filth receiving surface provided in front of the water reservoir portion, and in the rear side region and the lateral side region of the filth receiving surface.
The toilet body whose radius of curvature in the radial direction of the connecting surface is set to increase in the order of the front side region, the lateral side region, and the rear side region . The first spouting portion forms a first swirling flow that propagates backward through the first lateral portion on one of the left and right sides of the toilet bowl portion by discharging the washing water from the first spouting hole.
It has a second water discharge hole formed in the first lateral portion behind the water reservoir portion, and discharges washing water into the toilet bowl portion toward one side in the circumferential direction from the second water discharge hole. As a result, the water discharge part is provided with a second water discharge part that forms a first water flow that flows in from the rear to the water reservoir part.
The toilet body according to claim 1, wherein the first water flow is formed so as to flow into the water reservoir portion from the rear while being in contact with the standing wall surface after merging with a part of the first swirling flow. A pot-shaped filth receiving surface and a toilet bowl portion having a water reservoir portion that is recessed downward from the lower end edge of the filth receiving surface.
Toilet bowl drainage channel connected to the bottom of the toilet bowl
By discharging the washing water into the toilet bowl portion toward one side in the circumferential direction from the first water discharge hole, a first swirling flow is formed which travels backward through the first lateral portion on one side of the left and right sides of the toilet bowl portion. The first water spouting part and
It has a second water discharge hole formed in the first lateral portion behind the water reservoir portion, and discharges washing water into the toilet bowl portion toward one side in the circumferential direction from the second water discharge hole. As a result, the water discharge part is provided with a second water discharge part that forms a first water flow that flows into the water reservoir from the rear.
The water reservoir is configured to form an induced flow that pushes filth into the toilet drainage channel by the water flow that flows into the water reservoir from behind while contacting the standing wall surface provided on one side of the left and right sides of the water reservoir. Being done
The first water flow is formed so as to flow into the water reservoir from the rear while contacting the standing wall surface after merging with a part of the first swirling flow .
Before merging with a part of the first swirling flow, the first water flow flows into the water reservoir from the rear at the first lateral portion and after merging with a part of the first swirling flow. Is a toilet bowl body that flows into the water reservoir from the rear at the second lateral portion on the left and right opposite to the first lateral portion of the toilet bowl portion. The toilet bowl portion constitutes an inner peripheral surface of the toilet bowl portion, and has a surface portion extending from the inner side surface of the first water discharge hole in the discharge direction along the central axis of the first water discharge hole.
The surface portion is formed so as to extend from the inner side surface of the first water discharge hole toward the discharge direction, sandwiching an extension line of the central axis in a plan view, and extending toward the side opposite to the water reservoir portion. The toilet body according to any one of claims 1 to 3 .

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