JP2019173324A - Flush toilet bowl - Google Patents

Abstract

To provide a flush toilet bowl capable of effectively suppressing splashing of wash water to the outside of a bowl and the surroundings, particularly capable of improving washing performance in the rear area of a bowl surface.SOLUTION: A flush toilet bowl of the present invention has a bowl and a water discharge part discharging wash water to form a swirling flow on a bowl surface. The bowl surface has a connection surface 32 connecting the outer edge of a shelf to the lower edge 18a of a rim with a curved surface S6. Vertical curvature radiuses ρ2 of curved surfaces of the connection surfaces in the circumferential direction including both ends of front-rear and right-left on the bowl surface are set roughly identically. First connection surfaces are set at a position roughly same as a first height position in the front area and right-left side area including both ends of right-left in the bowl surface, and the second connection surface 32 is set at a second height position H2 lower than the first height position in the rear area in the bowl surface.SELECTED DRAWING: Figure 6B

Description

  The present invention relates to a flush toilet, and more particularly to a flush toilet that is washed with wash water supplied from a wash water source and discharges filth.

Conventionally, for example, those described in Patent Documents 1 to 3 are known as conventional flush toilets that are washed with washing water supplied from a washing water source and discharge filth.
First, in the conventional flush toilets described in Patent Documents 1 and 2, the wash water in the wash water tank provided at the back and above the toilet body is passed from a plurality of water supply ports to the back of the bowl via a distributor. It is designed to be supplied into the water supply space. Further, a water outlet is provided in the left side region of the rear side region of the inner peripheral surface of the bowl rim, and the wash water in the water supply space behind the bowl is discharged forward from the water outlet. It has come to be. In addition, the wash water spouted forward from the spout is the outer edge of the shelf surface of the bowl, the lower end of the inner wall surface of the rim, and the connection between the outer edge of the shelf surface of the bowl and the lower end of the inner wall surface of the rim. A swirl flow in contact with the surface is formed.
Furthermore, in the conventional flush toilet described in Patent Document 1 described above, the front region and the rear region in the connection surface between the outer edge of the shelf surface of the bowl and the lower end of the inner wall surface of the rim are located on the left and right sides of the connection surface. It is set at a position lower than the two side areas. As a result, the difference in height between the upper end surface of the rim and the swirling path of the cleaning water in the front region and the rear region of the bowl is greater than that in the left and right regions of the bowl, so that splashing upward of the cleaning water is suppressed. It has become so.
Moreover, in the conventional flush toilet described in Patent Document 2 described above, in the connection surface that connects the outer peripheral edge of the bowl shelf and the lower edge of the inner wall surface (standing wall surface) of the rim, the vertical direction of the curved surface Is the largest at the left and right center of the front region of the bowl, and gradually decreases toward the left and right sides. Further, the height position of the midpoint of the arc in the vertical direction of the curved surface of the connecting surface is lowest at the left and right center of the front region of the bowl. By these, when a urine collides with the curved surface of the left-right center part of the front side area | region of a bowl, it can make a urine flow easily, and it suppresses that a urine stays in the boundary part of a standing wall surface and a connection surface. Can be done.
Next, in the conventional flush toilet described in Patent Document 3, the rim is provided on the rim to discharge the wash water to the shelf to form a swirling flow on the bowl surface, and the water discharge direction is the forward direction of the toilet bowl. A water discharge part and a jet water discharge part formed on the side surface of the waste receiving surface and stirring the stored water in the vertical direction are provided. Further, a concave portion having a side wall and a bottom surface extending from the front side of the bowl toward the inlet of the drain trap pipe is formed on the dirt receiving surface of the bowl, and the cleaning water discharged from the rim water spouting portion is disposed on the side wall of the concave portion. It flows toward the inlet of the drain trap pipe by colliding with the water.

JP 2016-41881 A JP 2016-41879 A JP2012-229612A

However, in the conventional flush toilet described in Patent Documents 1 and 2 described above, for example, a spout is provided in the vicinity of the upstream side of the front region of the bowl having a small radius of curvature in plan view in the turning path. In such a case, the wash water immediately after the water discharge will drop vigorously while accelerating from the region on the left and right side of the connecting surface toward the front region at a position lower than this region. Then, the washing water that has increased the momentum and passed through the front area of the connecting surface jumps up when it rises toward the other area on the left and right sides of the connecting surface, so that it jumps out of the bowl or scatters around. There is a problem that there is a risk of.
Therefore, like the conventional flush toilets described in Patent Documents 1 and 2 described above, even if the front region of the connecting surface is set lower than the left and right regions, the upper end surface of the rim and the swirling path of the cleaning water Even if the height difference is set to be large, there is a problem that depending on the arrangement of the water outlet, it is difficult to prevent the bowl from jumping out and scattering to the surroundings.
Further, as in the conventional flush toilet described in Patent Document 2 described above, the upper and lower surfaces of the curved surface are connected at the connecting surface that connects the outer peripheral edge of the bowl shelf and the lower edge of the inner wall surface (standing wall surface) of the rim. Even if the radius of curvature of the direction is set to the maximum at the center of the left and right sides of the front area of the bowl and gradually decreased toward the left and right sides, depending on the location of the spout, There is a problem that it is difficult to suppress scattering.
Similarly, in the conventional flush toilet described in Patent Document 3 described above, for example, a spout is provided in the vicinity of the upstream side of the front region of the bowl having a small curvature radius in plan view in the turning path. In this case, when the wash water immediately after water discharge passes through the recess in the front region of the bowl, the water drops rapidly while accelerating toward the bottom surface of the recess lower than the water outlet. Then, the washing water having increased momentum may rise to the bottom of the concave portion and jump out to the outside of the bowl, or may splash into the surroundings by vigorously colliding with the side wall of the concave portion. There is a problem that there is.
Therefore, even in the conventional flush toilet described in Patent Document 3 described above, there is a problem that it is difficult to suppress the outside of the bowl from jumping out and the surroundings depending on the arrangement of the water outlet.
Furthermore, if these bowls cannot be prevented from jumping out or scattered to the surroundings, it will lead to energy loss in the flow of washing water, which is sufficient for the original toilet bowl to be cleaned. There is a problem that cleaning cannot be performed and an uncleaned portion is left on the bowl surface.
Among the bowl surfaces, especially the rear area of the filth receiving surface is a place where filth tends to adhere, but the wash water is weakened against the place where such filth tends to adhere. If supplied, the filth in the rear area of the filth receiving surface cannot be washed away sufficiently, and the filth remains, resulting in a problem that the cleaning performance with the rinsing water decreases.
Therefore, how to reliably clean the rear region of the bowl surface, such as a dirt receiving surface, to which dirt easily adheres, and improve the cleaning performance has been a conventionally requested issue.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and can effectively prevent the wash water from jumping out of the bowl and splashing to the surroundings. An object of the present invention is to provide a flush toilet capable of improving the washing performance in the rear region of the surface.

In order to solve the above-described problems, the present invention is a flush toilet that is washed with washing water supplied from a washing water source and discharges dirt, and includes a rim formed on an upper edge and a dirt receiver that receives the dirt. A bowl that forms a bowl-shaped bowl surface and forms a water storage portion below the bowl, and a shelf that is formed between the rim receiving surface and the rim. A drainage channel that discharges filth, and a water discharge portion that is provided on the rim and discharges cleaning water to the shelf to form a swirling flow on the bowl surface, and the bowl surface is formed on the shelf. A connecting surface connecting the outer edge and the lower edge of the rim with a curved surface, and the connecting surface is a curved surface of the connecting surface in a circumferential region including front and rear and left and right ends of the bowl surface; The vertical radius of curvature of The connection surface includes a first connection surface provided at substantially the same first height position in a front region on the bowl surface and a left and right side region including both left and right ends, and a rear region on the bowl surface. And a second connecting surface provided at a second height position lower than the first height position.
In this invention comprised in this way, the wash water discharged from the water discharging part flows along a shelf, and forms a swirl flow. At this time, the bowl surface has a connection surface that connects the outer edge of the shelf and the lower edge of the rim with a curved surface, and this connection surface is provided in a circumferential region including front and rear and left and right ends of the bowl surface. The curvature radius in the vertical direction of the curved surface is set to be substantially the same. Thereby, it is possible to suppress the cleaning water from being scattered due to a variation in the shelf shape and the like, and to suppress the energy loss of the cleaning water.
Further, the first connection surface of the connection surface is provided at substantially the same first height position in the front region on the bowl surface and the left and right side regions including the left and right ends, and the second connection surface of the connection surface is In the rear region of the bowl surface, the second connecting portion is provided at a second height position lower than the first height position of the first connecting surface.
Thus, when the wash water swirling in the circumferential direction along the shelf, the first connection surface, and the rim in the front region and the left and right side regions of the bowl surface flows into the rear region of the bowl surface, By flowing along the shelf surface in the region, the second connection surface, and the inner peripheral surface of the rim, it can flow down vigorously from the rear side toward the water storage portion below the bowl surface while maintaining a high energy state. it can.
Therefore, it is possible to reliably clean the rear region of the bowl surface where dirt easily adheres.

In the present invention, preferably, the lower end of the first connecting surface is provided at substantially the same height position below the upper surface of the rim by a predetermined distance across the front region and the left and right side regions of the bowl surface. The lower end of the second connection surface is provided at a lower height than the lower end of the first connection surface.
In the present invention configured as described above, the lower ends of the first connecting surfaces of the front region and the left and right side regions of the bowl surface are provided at the same height position below the upper surface of the rim by a predetermined distance. Therefore, the energy loss of the washing water swirling along the first connection surface in the front region and the left and right side regions on the bowl surface can be suppressed.
In addition, since the lower end of the second connecting surface in the rear region of the bowl surface is provided at a height position lower than the front region of the bowl surface and the lower end of the first connecting surface in the left and right side regions, the rear region of the bowl surface Energy loss can be suppressed while suppressing splashing of the washing water flowing near the second connecting surface.

In the present invention, preferably, the height position of the lower end of the second connection surface is set to the lowest height position in a substantially central region in the left-right direction within the rear region of the bowl surface.
In the present invention configured as described above, with respect to the height position of the lower end of the second connecting surface in the rear region of the bowl surface, the substantially central region in the left-right direction in the rear region of the bowl surface is at the lowest height position. Therefore, the wash water that flows on the shelf in the rear area of the bowl surface is smoothly guided from the vicinity of the central area in the left and right direction in the rear area of the bowl surface to the water reservoir below the bowl surface. Later, it can flow into the drain.
Thereby, since it can wash | clean intensively about the area | region of the center of the horizontal direction in the back area | region of the bowl surface where a filth tends to adhere, the cleaning performance in the back area | region of a bowl surface can be improved.
In addition, since the high-energy cleaning water flowing in the rear region of the bowl surface can be vigorously flowed into the reservoir portion from the rear side, the performance of discharging filth to the drainage channel can be improved.

In the present invention, preferably, the height position of the second connecting surface is set so as to continuously change along the circumferential direction in a rear region of the bowl surface.
In the present invention configured as described above, the height position of the second connecting surface in the rear region of the bowl surface is set so as to continuously change along the circumferential direction of the rear region of the bowl surface. , The height of the second connecting surface gradually descends from one side in the rear region of the bowl surface to the vicinity of the central region in the left-right direction along the circumferential direction, and then in the rear region of the bowl surface Can gradually rise toward the other side of the.
Accordingly, since a rapid change in the height position of the second connection surface can be suppressed, it is possible to suppress splashing of cleaning water flowing in the vicinity of the second connection surface in the rear region of the bowl surface and energy loss associated therewith. it can.

In the present invention, it is preferable that the rim has a first standing wall surface formed so that an inner peripheral surface thereof rises from an upper end of the first connection surface to an upper surface of the rim, and an inner peripheral surface of the rim is the first rim. A second standing wall formed so as to rise from the upper end of the two connecting surfaces to the upper surface of the rim, and a first vertical distance from the lower end to the upper end of the first standing wall is the front of the bowl surface The second distance in the vertical direction from the lower end to the upper end of the second standing wall surface in the rear region of the bowl surface is larger than the first distance. Is set.
In the present invention configured as described above, the first vertical distance from the lower end to the upper end of the first standing wall surface is set substantially the same over the front area and the left and right side areas of the bowl surface. The wash water flowing along the first standing wall surface in the front area and the left and right side areas of the bowl surface can be caused to flow into the rear area of the bowl surface in a state where energy loss is suppressed.
Also, when the wash water that flows along the first standing wall flows into the rear region of the bowl surface and flows along the second standing wall, the flow of the washing water may change and water splashing may occur. Also, the second vertical distance from the lower end to the upper end of the second standing wall in the rear area of the bowl surface is the vertical distance from the lower end to the upper end of the first standing wall in the front area and the left and right side areas of the bowl surface. Since the distance is set to be greater than one distance, water splashing can be effectively suppressed.

In the present invention, preferably, the water discharge portion is a first water discharge port disposed in the vicinity of a region changing from a lateral region on one side to the front region with respect to a central axis extending in the front-rear direction of the bowl surface; And a second water discharge port disposed in the vicinity of a region changing from the lateral region on the other side to the rear region with respect to a central axis extending in the front-rear direction of the bowl surface.
In the present invention configured as described above, the first water discharge port of the water discharge unit is disposed in the vicinity of the region that changes from the side region on one side to the front region with respect to the central axis extending in the front-rear direction of the bowl surface. Therefore, the wash water immediately after water discharge from the first water discharge port is in a state where energy loss is relatively likely to occur and water splashing is likely to occur.
However, since the curvature radius in the vertical direction of the curved surface of the connecting surface is set to be substantially the same in the circumferential region including the front and rear and left and right ends of the bowl surface, the wash water immediately after water discharge from the first water discharge port After flowing into the front area of the bowl surface, it is possible to stably rotate while suppressing energy loss and water splashing.
Moreover, since the 2nd water outlet of a water discharging part is arrange | positioned in the area | region vicinity changed from the side area | region of the other side with respect to the center axis line extended in the front-back direction of a bowl surface, it is discharged from a 2nd water outlet. The washed water thus flows will flow with some centrifugal force acting along a shelf in the rear region of the bowl surface.
However, since the second connection surface in the rear region of the bowl surface is provided at a position lower than the first connection surface in the front region of the bowl surface and the left and right side regions including both left and right ends, the rear region of the bowl surface Thereafter, the wash water flowing on the shelves is smoothly guided to the water reservoir below the bowl surface while maintaining high energy. And the washing water in the water reservoir forms a swirling flow that swirls in the vertical direction and can be stirred strongly.
Then, the washing water flows into the drainage channel and the filth can be washed away by the flowing water action caused by the water drop in the vertical direction of the bowl surface.

In this invention, Preferably, the distance of the perpendicular direction between the lower end of the said 1st connection surface and the lower end of the said 2nd connection surface is set to 3 mm-15 mm.
In this invention comprised in this way, the splashing of the washing water which flows near the 2nd connection surface in the back area | region of a bowl surface, and the energy loss accompanying it can be suppressed effectively.

  According to the flush toilet of the present invention, it is possible to effectively prevent the wash water from jumping out of the bowl and to the surroundings, and in particular, it is possible to improve the washing performance in the rear region of the bowl surface. .

It is a schematic plan view of the flush toilet according to one embodiment of the present invention. It is sectional drawing along the II-II line of FIG. It is sectional drawing along the III-III line of FIG. It is sectional drawing along the IV-IV line of FIG. It is sectional drawing along the VV line of FIG. It is the A section enlarged view of FIG. It is the B section enlarged view of FIG. It is the C section enlarged view of FIG. It is the D section enlarged view of FIG. It is the E section enlarged view of FIG. It is the F section enlarged view of FIG. It is the schematic plan view which demonstrated roughly the flow of the washing water in the bowl of the flush toilet bowl by one Embodiment of this invention. It is a schematic front sectional view schematically illustrating the flow of washing water in a bowl of a flush toilet according to an embodiment of the present invention.

Next, a flush toilet according to an embodiment of the present invention will be described with reference to FIGS.
First, FIG. 1 is a schematic plan view of a flush toilet according to an embodiment of the present invention.
As shown in FIG. 1, the flush toilet 1 by one Embodiment of this invention is equipped with the toilet bowl main body 2 made from earthenware. The toilet body 2 includes a water conduit 4, a bowl-shaped bowl 6, and a drain trap conduit 8 from the upstream side toward the downstream side.
Further, the flush toilet 1 of the present embodiment is a so-called “wash-out flush toilet” in which filth is pushed to the drain trap pipe 8 by the flowing water action caused by the water drop in the bowl 6 of the toilet body 2. .
The toilet body 2 may be made of resin other than ceramics.

Next, a toilet seat (not shown), a toilet lid (not shown), and the like are provided on the upper surface of the toilet body 2 of the flush toilet 1 of the present embodiment shown in FIG. Since it is the same as the structure of a toilet bowl, detailed description is abbreviate | omitted.
In addition, on the upper surface of the toilet body 2, on the rear side of the toilet seat (not shown) and the toilet lid (not shown), the sanitary washing part (not shown) for washing the user's local part is connected to the toilet body 2. Functional parts (not shown) such as a water supply system functional part related to the water supply function of the water may be provided, but since these are also similar to the structure of a conventional flush toilet, a specific description will be given. Is omitted.

Next, as shown in FIG. 1, a flush toilet 1 according to an embodiment of the present invention includes a flush water tank device 10 that is a flush water source provided behind and above a bowl 6 of a toilet body 2. .
Further, the washing water tank apparatus 10 includes a gravity water supply type water storage tank 10a that allows the stored washing water to be supplied to the water conduit 4 of the toilet body 2 using gravity.
Here, in the water storage tank 10a, typically, a water supply device (not shown) for supplying cleaning water to the water storage tank 10a and a drainage for opening and closing a drain port (not shown) of the water storage tank 10a. Although a valve device (not shown) and the like are provided, these devices are the same as those in the related art, and thus a detailed description thereof will be omitted.
In the present embodiment, the washing water source for supplying the washing water to the toilet body 2 is not limited to a tank type such as the above-described gravity water supply water storage tank 10, and other forms are also applicable. . That is, the flush water source that supplies the flush water to the toilet body 2 may be a direct water tap type or a flush valve type that directly uses the supply pressure of tap water, or a supplementary pressure of the pump is used. Thus, the cleaning water may be supplied.

Next, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a sectional view taken along line IV-IV in FIG. 1, and FIG. 5 is a sectional view taken along line VV in FIG.
In addition, in FIGS. 2-5, it has abbreviate | omitted about the washing water tank apparatus 10 of the flush toilet 1 of this embodiment.
Here, in the flush toilet 1 according to the embodiment of the present invention shown in FIG. 1, in the plan view of the bowl 6 of the toilet body 2, the center extending horizontally and horizontally so as to bisect the bowl 6 in the front-rear direction. The axis is indicated by “X”, and the central axis extending in the horizontal front-rear direction so as to bisect the bowl 6 in the left-right direction is indicated by “Y”.
In FIG. 1, the intersection of the center axes X and Y is the center O of the bowl 6 in plan view, and the center axis extending in the vertical direction passing through the center O is indicated by “Z”.
Accordingly, in the flush toilet 1 according to the embodiment of the present invention shown in FIGS. 2 and 3, in the side view of the bowl 6 of the toilet body 2, the bowl 6 is vertically divided so as to be divided in the front-rear direction. The extending central axis is indicated by “Z”.
Furthermore, as shown in FIGS. 1 to 3, the front, rear, left and right directions of the flush toilet 1 are indicated by “front”, “rear”, “left”, and “right”, respectively.

Moreover, as shown in FIGS. 1-3, in the bowl 6 of the flush toilet 1, only the predetermined distance Y1 [mm] from the front end (front end 6a of the bowl surface S) along the center axis line Y of the horizontal front-back direction. A region up to the rear boundary position P1 is defined as “front region F of bowl 6”, and a predetermined distance Y2 from the rear end in bowl 6 (rear end 6b of bowl surface S) along central axis Y in the horizontal front-rear direction. A region up to the boundary position P2 ahead by [mm] is defined as “a rear region B of the bowl 6”.
Further, as shown in FIGS. 1 to 3, in the bowl 6 of the flush toilet 1, the region on the right side with respect to the central axis Y in the horizontal front-rear direction in the region between the front region F and the rear region B. Is defined as “the right side region R of the bowl 6”, and the side region on the left side with respect to the central axis Y in the horizontal front-rear direction between the front region F and the rear region B is defined as “the left side of the bowl 6. Region L "is defined.
For example, as shown in FIG. 1, when the total length distance in the front-rear direction from the front end 6 a to the rear end 6 b in the bowl 6 is Y0 [mm], the predetermined range corresponding to the horizontal front-rear direction range of the front region F of the bowl 6. The distance Y1 is set to a size of 30% to 40% (Y1 / Y0 = 0.30 to 0.40) with respect to the full length distance Y0.
Further, as shown in FIG. 1, the predetermined distance Y2 corresponding to the range in the horizontal front-rear direction of the rear region B of the bowl 6 is 15% to 25% (Y2 / Y0 = 0.15-0) with respect to the total length Y0. .25).

Next, as shown in FIGS. 1 to 5, the water conduit 4 located on the upstream side of the toilet body 2 is formed on the rear side of the bowl 6, and guides the wash water supplied from the water storage tank 10 to the bowl 6. It is like that.
Moreover, as shown in FIGS. 1-5, the bowl 6 located in the downstream of the water conduit 4 of the toilet body 2 is provided with a recess 12, a filth receiving surface 14, a shelf 16, and a rim from the bottom to the top. 18 is provided.

First, the concave portion 12 of the bowl 6 is formed in a concave shape below the bowl 6 and serves as a water storage portion for storing the water storage W0.
Next, the filth receiving surface 14 of the bowl 6 is formed in a bowl shape from the upper edge of the recess 12 and serves as a surface for receiving the filth.
Here, as shown in FIGS. 1 to 5, the bowl surface S is bent downward from the filth receiving surface 14 to the recess 12, and the recess 12 defines the point where the bending is started as the filth receiving surface 14. As the boundary.
In FIG. 1 to FIG. 5, the boundary line between the filth receiving surface 14 and the recess 12 is “M”. That is, the boundary line M corresponds to the upper edge of the recess 12 and also corresponds to the inner edge and the lower edge of the dirt receiving surface 14.
1-5, the rim 18 of the bowl 6 forms the upper edge of the bowl 6, and the inner peripheral surface S1 of the rim 18 is generally oval in plan view shown in FIG. It is formed in the shape of.

Here, as shown in FIG. 1, in the plan view of the inner peripheral surface S1 of the rim 18 of each of the front region F, the rear region B, and the left and right side regions L and R of the bowl 6, representatives in the vicinity of each front end 6a. A typical radius of curvature is r1, a typical radius of curvature near the rear end 6b is r2, a typical radius of curvature near the left end 6c is r3, and a typical radius of curvature near the right end 6d is r4.
At this time, the curvature radius r1 is set smaller than the curvature radii r2, r3, r4. Further, the curvature radii r3 and r4 are set to be substantially the same curvature radius at the symmetrical position of the bowl 6, and are set larger than the curvature radius r2 (r1 <r2 <r3≈r4).
Furthermore, as shown in FIGS. 1 to 5, the shelf 16 of the bowl 6 is formed between the outer edge of the filth receiving surface 14 and the lower end of the rim 18. The washing water in the water conduit 4 is guided to each of two rim water spouting ports (first rim water spouting port 20 and second rim water spouting port 22), which will be described in detail later, and then discharged along the shelf 16. It is guided to the downstream side in the circumferential direction.

Next, as shown in FIGS. 1 to 5, the water conduit 4 includes a common water passage 24, a first rim water passage 26, and a second rim water passage 28.
First, as shown in FIGS. 1 to 3, the common water passage 24 is a toilet main body on the rear side of the bowl 6 so as to extend from the rear inlet 4 a connected to the water storage tank 10 to the vicinity of the back side of the front bowl 6. 2 is formed inside.
In addition, as shown in FIGS. 1, 2, 4 and 5, the first rim water passage 26 is located near the back side of the bowl 6 from the common water passage 24 to one side of the bowl 6 (viewed from the front of the bowl 6). Branch to the left).
As shown in FIGS. 1, 2, 4, and 5, the first rim water passage 26 extends forward while bypassing the outer peripheral surface of the bowl 6, and the rim 18 in the left side region L of the bowl 6. After being formed inside, it extends to the first water outlet (first rim water outlet 20) in the front region F in front of it.

On the other hand, as shown in FIGS. 1 and 3 to 5, the second rim water passage 28 is in the vicinity of the back side of the bowl 6 from the common water passage 24 to the other side of the bowl 6 (the right side when viewed from the front of the bowl 6. ).
Also, as shown in FIGS. 1 and 3 to 5, the second rim water passage 28 is formed inside the rim 18 in the rear region B of the bowl 6 so as to extend forward while bypassing the outer peripheral surface of the bowl 6. Is done.
As shown in FIGS. 1 and 3 to 5, the second rim water passage 28 is located in front of the rear region B of the bowl 6 and in the right region R behind the central axis X in the horizontal left-right direction. The rim 18 is formed so as to make a U-turn rearward, and then extends to the rear second water outlet (second rim water outlet 22) in the right side region R of the bowl 6.
Furthermore, as shown in FIG. 1, the second rim water passage 28 is more specifically, from the upstream side toward the downstream side, the inlet 28 a, the outer water passage 28 b, the bent water passage 28 c, and the inner side And a water passage 28d.
As a result, the second rim water passage 28 has a portion from the front portion (downstream portion) of the outer water passage 28b to the second rim water discharge port 22 at the downstream end via the bent water passage 28c and the inner water passage 28d. A portion (U-turn portion U) that turns into a U shape in plan view is formed.

Next, as shown in FIG. 1 to FIG. 3 and FIG. 5, the drain trap pipe 8 located on the downstream side of the toilet body 2 is formed rearward from the bottom of the bowl 6 to discharge the filth in the bowl 6. It is a drainage channel.
Moreover, as shown in FIGS. 1 to 3 and 5, the inlet 8 a of the drain trap pipe 8 is connected to the lower side of the recess 12 of the bowl 6.
Further, as shown in FIGS. 2 and 3, the drain trap pipe 8 includes a descending path 8b that descends downward and rearward from the inlet 8a, and an ascending path that rises upward and backward from the downstream end of the descending path 8b. 8c.

Next, as shown in FIGS. 1 to 5, the bowl 6 includes a wall surface S <b> 2 including a bottom wall surface 12 a and a side wall surface 12 b in the recess 12, an entire surface S <b> 3 of the filth receiving surface 14, and a shelf 16. The surface (shelf surface) S4 and the inner peripheral surface S1 of the rim 18 are formed, and a bowl-shaped bowl surface S is formed by these surfaces S1 to S4.
In the present embodiment, the shape of the bowl surface S in a plan view of the bowl 6 will be described with respect to a shape formed in a generally oval shape. There may be.

Next, as shown in FIGS. 1 and 2, the first rim spout 20 of the flush toilet 1 is forward from the left side region L on one side with respect to the central axis Y extending in the horizontal front-rear direction of the bowl surface S. It is arranged in the vicinity of the region that changes to the region F. More specifically, the first rim spout 20 is disposed on the rear side in the front region F in front of the boundary position P1 of the front region F of the bowl 6.
For example, as shown in FIGS. 1 and 2, the distance Y3 in the front-rear direction from the front end 6a in the bowl 6 to the position P3 of the first rim spout 20 in the front region F of the bowl 6 is the total length in the bowl 6. The size is set to 15% to 35% (Y3 / Y0 = 0.15 to 0.35) with respect to the distance Y0.
Next, as shown in FIG.1 and FIG.3, the 2nd rim spout 22 of the flush toilet 1 is a back area | region from the right side area | region R of the other side with respect to the central axis Y extended in the front-back direction of the bowl surface S. It is arranged in the vicinity of the region that changes to B. More specifically, the second rim water spouting port 22 is disposed on the rear side in the right side region R ahead of the boundary position P2 on the front side of the rear region B of the bowl 6.
For example, as shown in FIGS. 1 and 3, the distance Y4 in the front-rear direction from the rear end 6b in the bowl 6 to the position P4 of the second rim water spouting port 22 in the right side region R of the bowl 6 is 15% to 35% (Y4 / Y0 = 0.15 to 0.35) with respect to the total length Y0.

Next, as shown in FIGS. 1 and 3 to 5, the position P4 of the second rim water spouting port 22 is located at the rear end position P5 of the concave portion 12 of the bowl 6 (on the rear wall surface 12c in the concave portion 12 shown in FIG. 3). It is set in front of the position corresponding to the upper end position).
In particular, as shown in FIG. 1, the rear end position P <b> 5 of the recess 12 is located at the rearmost end on the boundary line M between the dirt receiving surface 14 and the recess 12.
Moreover, as shown in FIGS. 1-3 and FIG. 5, about the water level (reserved water surface WL) of the stored water W0 accommodated in the recessed part 12 of the bowl 6, before toilet cleaning started and toilet cleaning was completed. The still water position in the waiting state is shown.
As shown in FIG. 1, the position P4 of the second rim water spouting port 22 is more forward than the rear end position P6 of the stored water surface WL of the stored water W0 accommodated in the recess 12 of the bowl 6 in plan view. Is set.
Furthermore, as shown in FIGS. 1 and 3, the opening cross section of the second rim water spouting port 22 opens in a state of being directed toward the rear in the front-rear direction of the toilet body 2.

Next, FIG. 6A is an enlarged view of part A of FIG. 3, and FIG. 6B is an enlarged view of part B of FIG. 6C is an enlarged view of part C in FIG. 4, and FIG. 6D is an enlarged view of part D in FIG. Further, FIG. 6E is an enlarged view of the portion E in FIG. 5, and FIG. 6F is an enlarged view of the portion F in FIG.
First, as shown in FIGS. 1, 6A, and 6C to 6F, the bowl surface S has a front region F and left and right side regions L and R including left and right ends 6c and 6d. A first connection surface 30 is provided to connect the outer edge 16a of the shelf surface S4 and the lower edge 18a of the rim 18 with a curved surface S5.
Further, as shown in FIGS. 1 and 6B, the bowl surface S further connects the outer edge 16a of the shelf surface S4 of the shelf 16 and the lower edge 18a of the rim 18 with a curved surface S6 in the rear region R thereof. The second connecting surface 32 is provided.
Further, as shown in FIGS. 6A to 6F, in the elevational view of the curved surfaces S5 and S6 of the first connecting surface 30 and the second connecting surface 32 of the bowl surface S, the respective curvature radii ρ1, ρ2 in the vertical direction are shown. Are set almost the same.
Here, it is natural that the curvature radii ρ1 and ρ2 are “substantially identical” to each other, including the case where they are completely identical (ρ1 = ρ2). In consideration of the manufacturing error, the range of errors that can be regarded as substantially the same (ρ1≈ρ2) is also included.
In the present embodiment, in the circumferential region including the front and rear ends 6a and 6b and the left and right ends 6c and 6d on the bowl surface S, the vertical directions in the elevational view of the curved surfaces S5 and S6 of the connection surfaces 30 and 32 are shown. Are set substantially the same as each other.
However, in the present embodiment, the “circumferential region including the front and rear ends 6a and 6b and the left and right ends 6c and 6d on the bowl surface S” is circumferential with respect to the center O of the bowl surface S in plan view. In addition to this, the front and rear ends 6a and 6b and the left and right ends 6c of the bowl surface S are naturally included in addition to the entire peripheral area including the front and rear ends 6a and 6b and the left and right ends 6c and 6d. , 6d, and a region that can be regarded as almost the entire circumference that is not less than the entire circumference of the bowl surface S and less than the entire circumference.
The vertical curvature radii ρ1 and ρ2 of the curved surfaces S5 and S6 in the elevational view of the connection surfaces 30 and 32 are preferably set to 3 mm to 20 mm, and preferably set to 5 mm to 15 mm. Most preferably.

Next, as shown in FIGS. 3, 4, 6A, and 6C to 6F, the lower end 30a of the first connection surface 30 is formed in the front region F of the bowl surface S and the left and right side regions L and R, respectively. The rim 18 is provided at almost the same height position (first height position) H1 by a first predetermined distance d1 vertically below the height position H0 of the upper surface 18b (uppermost end surface) of the rim 18. .
Here, “substantially the same” in the description of “substantially the same height position” naturally includes a case where the height positions are completely the same, as well as a case where the height positions are not completely the same. However, it also includes a range of errors that can be regarded as almost the same height position in consideration of manufacturing errors of the toilet bowl body 2 made of ceramic.
As shown in FIGS. 3, 4 and 6B, the lower end 32a of the second connecting surface 32 is larger than the first predetermined distance d1 with respect to the height position H0 of the upper surface 18b (uppermost end surface) of the rim 18. The second predetermined distance d2 (> d1) is provided at a lower height position (second height position) H2.
That is, as shown in FIGS. 2 and 3, the height position H <b> 2 of the lower end 32 a of the second connection surface 32 is set to a position lower than the height position H <b> 1 of the lower end 30 a of the first connection surface 30.
Further, the vertical distance d3 from the lower end 30a to the upper end 30b of the first connecting surface 30 shown in FIGS. 6A and 6C to 6F, and the lower end 32a to the upper end 32b of the second connecting surface 32 shown in FIG. 6B. The distance d4 in the vertical direction is also set to be approximately the same.
Here, the distances d3 and d4 are “substantially identical” to each other, including the case where they are completely identical (d3 = d4). When manufacturing errors and the like are taken into consideration, a range of errors that can be regarded as substantially the same (d3≈d4) is also included.
Accordingly, the height position (second height position) of the second connection surface 32 is set to a position relatively lower than the height position (first height position) of the first connection surface 30.

Here, as shown in FIG. 6A and FIGS. 6C to 6F, the vertical downward direction from the height position H0 of the upper surface 18b (uppermost end surface) of the rim 18 to the height position H1 of the lower end 30a of the first connecting surface 30 is shown. The first predetermined distance d1 is preferably set to 50 mm to 85 mm, and most preferably set to 55 mm to 75 mm.
Further, as shown in FIG. 6B, a second predetermined distance d2 vertically below from the height position H0 from the upper surface 18b (uppermost end surface) of the rim 18 to the height position H2 of the lower end 32a of the second connecting surface 32. Is preferably set to 53 mm to 100 mm, and most preferably set to 58 mm to 90 mm.
Furthermore, as shown to FIG. 6A-FIG. 6F, each vertical direction from height position H1, H2 of each lower end 30a, 32a of each connection surface 30, 32 to height position H3, H4 of each upper end 30b, 32b is shown. The distances d3 and d4 are preferably set to 3 mm to 20 mm, and most preferably set to 5 mm to 10 mm.
Further, as shown in FIGS. 2 and 3, the vertical distance d5 between the height position H1 of the lower end 30a of the first connection surface 30 and the height position H2 of the lower end 32a of the second connection surface 32 is It is preferably set to 3 mm to 15 mm, and most preferably set to 5 mm to 10 mm.

Next, as shown in FIGS. 6A and 6C to 6F, in the rim 18 of the front region F and the left and right side regions L and R of the bowl surface S, the inner peripheral surface S1 is the upper end of the first connecting surface 30. A first standing wall surface S7 formed so as to rise from 30b to the upper surface 18b of the rim 18 is formed.
Then, as shown in FIGS. 6A and 6C to 6F, from the height position H3 of the lower end 30b of the first standing wall surface S7 (the lower end 18a of the rim 18), the upper end of the first standing wall surface S7 (the uppermost end surface 18b of the rim 18). The vertical distance d6 to the height position H0 is set to be substantially the same over the front area F and the left and right side areas L and R of the bowl surface S.
Here, “substantially the same” includes cases where they are completely the same, and even if they are not completely the same, it is considered that they are almost the same in consideration of manufacturing errors of the toilet body 2 made of ceramics. The range of errors that can be included is also included.

As shown in FIGS. 6A and 6C to 6F, the first standing wall surface S7 includes a lower standing wall surface S8 and an upper standing wall surface S9 that respectively form a lower region and an upper region of the inner peripheral surface of the rim 18. I have.
6A and 6C to 6F, the lower vertical wall surface S8 of the first vertical wall surface S7 is formed to rise obliquely outward from the lower end 18a toward the upper end 18c.
The lower vertical wall surface S8 may have a shape that rises vertically from the lower end toward the upper end.
Further, as shown in FIGS. 6A and 6C to 6F, the upper standing wall surface S9 of the first standing wall surface S7 has a rising portion S10 formed so as to rise obliquely inward from the lower end 18c toward the upper end. I have.
Further, the upper standing wall surface S9 of the first standing wall surface S7 includes an overhang portion S11 provided at the upper end portion of the rising portion S10 and protruding inward.
The rising portion S10 of the upper vertical wall surface S9 of the first vertical wall surface S7 may have a shape that rises vertically from the lower end toward the upper end.

Next, as shown in FIG. 6B, in the rim 18 in the rear region B of the bowl surface S, the inner peripheral surface S1 is formed so as to rise from the upper end 32b of the second connecting surface 32 to the upper surface 18b of the rim 18. A second standing wall surface S12 is formed.
6B, from the height position H4 of the lower end 32b of the second standing wall surface S12 (the lower end 18a of the rim 18) in the rear region B of the bowl surface S, the upper end of the second standing wall surface S12 (the top of the rim 18). The vertical distance d7 to the height position H0 of the end face 18b) is from the height position H3 of the lower end 30b of the first standing wall surface S7 shown in FIGS. 6A and 6C to 6F to the upper end 18b of the first standing wall surface S7. It is set larger than the distance d6 in the vertical direction to the height position H0 (d7> d6).

6B, the second standing wall surface S12 includes a lower standing wall surface S13 and an upper standing wall surface S14 that respectively form a lower region and an upper region of the inner peripheral surface of the rim 18.
As shown in FIG. 6B, the lower vertical wall surface S13 of the second vertical wall surface S12 is formed to rise obliquely outward from the lower end 18a toward the upper end 18c.
In addition, about this lower standing wall surface S13, the shape which stands | starts up vertically from the lower end toward an upper end may be sufficient.
Further, as shown in FIG. 6B, the upper standing wall surface S14 of the second standing wall surface S12 includes a rising portion S15 formed so as to rise obliquely inward from the lower end 18c toward the upper end.
The upper standing wall surface S14 of the second standing wall surface S12 includes an overhang portion S16 that is provided at the upper end portion of the rising portion S15 and protrudes inward.
The rising portion S15 of the upper vertical wall surface S14 of the second vertical wall surface S12 may have a shape that rises vertically from the lower end toward the upper end.

Next, as shown in FIGS. 2 to 5 and 6B, the height position H2 of the lower end 32a of the second coupling surface 32 in the rear region B of the bowl surface S is continuously changed along the circumferential direction. Is set to
2 to 5 and 6B, the height position H2 of the lower end 32a of the second connecting surface 32 in the rear region B of the bowl surface S is in the left-right direction in the rear region B of the bowl surface S. In the substantially central region (central region C1), the lowest height position (minimum height position H5) is set.
Accordingly, the height position H2 of the lower end 32a of the second connection surface 32 is set to one side in the rear region B of the bowl surface S (the right side (second rim discharge) when the toilet body 2 in FIGS. 4 and 5 is viewed from the front). From the water inlet 22 side)), it gradually descends to the vicinity of the substantially central region C1 in the left-right direction in the rear region B of the bowl surface S along the circumferential direction, and then the other in the rear region B of the bowl surface S It gradually rises toward the side (left side when the toilet body 2 in FIGS. 4 and 5 is viewed from the front).

Below, with reference to FIGS. 1-8, the effect | action of the flush toilet 1 by one Embodiment of this invention is demonstrated.
FIG. 7 is a schematic plan view schematically illustrating the flow of washing water in a bowl of a flush toilet according to an embodiment of the present invention. FIG. 8 is a schematic front sectional view schematically illustrating the flow of washing water in the bowl of the flush toilet according to one embodiment of the present invention.
First, as shown in FIG. 7, toilet cleaning is started, and the cleaning water in the water storage tank 10 is supplied from the inlet 4 a of the water conduit 4 of the toilet body 2 to the common water passage 24.
Then, the wash water in the common water passage 24 (flow f0 in FIG. 7) branches into the first rim water passage 26 and the second rim water passage 28, respectively, and the first rim water outlet 20 and the second rim water outlet 20 on the downstream side. After being supplied to each of the rim water spouting ports 22, the water is discharged downstream in the circumferential direction.
Here, as shown in FIG. 7, the wash water discharged from the first rim spout 20 at a relatively large flow rate (flow f1) is the front surface F of the bowl surface S, the shelf surface S4 of the shelf 16, After turning to the right side region R of the bowl surface S on the downstream side along the curved surface S5 of the first connecting surface 30 and the inner peripheral surface S1 of the rim 18, it flows to the rear region B of the bowl surface S.
Then, a swirl flow f1 (so-called “lateral swirl flow”) swirling on the bowl surface S (entire surface S3 of the filth receiving surface 14) in the circumferential direction is formed.
As a result, the cleaning water f1 (see FIG. 7) swirls around the entire circumference of the bowl surface S (soil receiving surface 14 and the like), cleans the entire area of the bowl surface S, and then flows into the recess 12 of the bowl 6. Therefore, the filth is pushed into the drain trap pipe 8 by the flowing water action due to the water drop in the bowl 6.

On the other hand, as shown in FIGS. 6B, 7, and 8, the wash water (flow f <b> 2) spouted rearward from the second rim spout 22 has a swirl direction of the swirl flow f <b> 1 in the rear region B of the bowl surface S. In the same direction as the center region C1 in the left-right direction in the rear region B of the bowl surface S, along the shelf surface S4, the curved surface S6 of the second connecting surface 32, and the inner peripheral surface S12 of the rim 18. And flows smoothly downstream.
As shown in FIGS. 7 and 8, the wash water f2 that has reached the vicinity of the central region C1 in the left-right direction in the rear region B of the bowl surface S is on the left side of the central region C1 in the rear region B of the bowl surface S. A flow f3 is formed which drops from the sewage receiving surface 14 toward the stored water W0 in the stored water portion (recessed portion 12) below the bowl surface S.
Further, as shown in FIGS. 6B, 7, and 8, a part of the cleaning water discharged from the second rim spouting port 22 is the second near the right side of the central region C <b> 1 of the rear region B of the bowl surface S. From the standing wall surface S12, the shelf surface S4, the second connection surface 32, and the filth receiving surface 14, a flow f4 is formed that drops from the rear side toward the stored water W0 in the recess 12 of the bowl 6.
7 and 8, in the recess 12 of the bowl 6, a swirling flow f5 (so-called “vertical swirling flow”) swirling in the vertical direction is generated by the flows f3 and f4 of the washing water. It is formed. As a result, after the accumulated water W0 in the recess 12 of the bowl 6 is vigorously stirred, the filth is pushed into the drain trap pipe 8 by the flowing action caused by the water drop in the recess 12 of the bowl 6.

According to the flush toilet 1 according to the embodiment of the present invention described above, as shown in FIGS. 6A to 7, the wash water f1 spouted from the first rim spout 20 is the front area F of the bowl surface S and After turning in the circumferential direction along the shelf 16, the first connection surface 30, and the inner peripheral surface S 7 of the rim 18 in the right side region R, it flows into the rear region B of the bowl surface S.
At this time, as shown in FIGS. 1, 6A, and 6C to 6F, the bowl surface S has a shelf 16 in the front area F and the left and right side areas L and R including the left and right ends 6c and 6d. The first connecting surface 30 is provided to connect the outer edge 16a of the shelf surface S4 and the lower edge 18a of the rim 18 with a curved surface S5.
Further, as shown in FIGS. 1 and 6B, the bowl surface S further connects the outer edge 16a of the shelf surface S4 of the shelf 16 and the lower edge 18a of the rim 18 with a curved surface S6 in the rear region R thereof. The second connecting surface 32 is provided.
Further, as shown in FIGS. 6A to 6F, in the elevational view of the curved surfaces S5 and S6 of the first connecting surface 30 and the second connecting surface 32 of the bowl surface S, the respective curvature radii ρ1, ρ2 in the vertical direction are shown. Are set almost the same.
Accordingly, it is possible to prevent the cleaning water from scattering due to variations in the shape of the shelf 16 and the like, and to suppress energy loss of the cleaning water.
Further, the first connection surface 30 is provided at substantially the same height in the front region F on the bowl surface S and the left and right side regions L and R including the left and right ends 6c and 6d. 32 is provided at a height position lower than the height position of the first connecting surface 30 in the rear region B of the bowl surface S.
Accordingly, the flow f2 of the cleaning water discharged from the second rim spout 22 is along the shelf surface S4, the second connection surface 32, and the inner peripheral surface S12 of the rim 18 in the rear region B of the bowl surface S. While flowing and in a high energy state, it is possible to vigorously flow down from the rear side toward the water reservoir (recessed portion 12) below the bowl surface S.
Therefore, the filth receiving surface 14 in the rear region B of the bowl surface S where filth tends to adhere can be reliably washed.

Next, according to the flush toilet 1 according to the present embodiment, as shown in FIGS. 2, 3, 6A and 6C to 6F, the front region F and the left and right side regions L, R of the bowl surface S The lower ends 30a of the first connection surfaces 30 are provided at the same height position H1 below the position H0 of the upper surface 18b of the rim 18 by a predetermined distance d1. Thereby, the energy loss of the washing water f1 swirling along the 1st connection surface 30 of the front area | region F and the left-right side area | regions L and R in the bowl surface S can be suppressed.
2, 3, and 6 </ b> B, the lower end 32 a of the second connection surface 32 in the rear region B of the bowl surface S is connected to the front region F and the left and right side regions L and R of the bowl surface S. The one connection surface 30 is provided at a height position H2 lower than the height position H1 of the lower end 30a. Thereby, energy loss can be suppressed while suppressing splashing of the washing water flowing in the vicinity of the second coupling surface 32 in the rear region B of the bowl surface S.

Moreover, according to the flush toilet 1 by this embodiment, as shown in FIG.2, FIG.3, FIG.6B and FIG. 8, the height position of the lower end 32a of the 2nd connection surface 32 of the back area | region B of the bowl surface S is shown. About H2, the area C1 in the center in the left-right direction in the rear area B of the bowl surface S is set to the lowest height position H5. Thus, the wash water f2 flowing along the shelf surface S4 in the rear region B of the bowl surface S, the curved surface S6 of the second connecting surface 32, and the inner peripheral surface S12 of the rim 18 is contained in the rear region B of the bowl surface S. Can be smoothly reached near the central region C1 in the left-right direction.
As shown in FIGS. 7 and 8, most of the wash water f2 that has reached the vicinity of the central region C1 in the left-right direction in the rear region B of the bowl surface S is the central region in the rear region B of the bowl surface S. It is possible to form a flow f3 that drops from the waste receiving surface 14 on the left side of C1 toward the stored water W0 in the stored water portion (recessed portion 12) below the bowl surface S, and then into the drain trap pipe 8. Can flow in.
At the same time, part of the cleaning water f2 that has reached the vicinity of the central region C1 in the left-right direction in the rear region B of the bowl surface S is the second standing wall surface S12 near the right side of the central region C1 of the rear region B of the bowl surface S. From the shelf surface S4, the second connection surface 32, and the filth receiving surface 14, a flow f4 can be formed that drops from the rear side toward the stored water W0 in the recess 12 of the bowl 6, and then the drain trap pipe It can flow into the path 8.
Since these washing waters f3 and f4 can intensively wash the vicinity of the central region C1 in the left-right direction in the rear region B of the bowl surface S where dirt easily adheres, The cleaning performance can be improved. In addition, since high-energy cleaning water flowing in the rear region B of the bowl surface S can be vigorously flowed from the rear side into the reservoir (recessed portion 12), filth discharge to the drain trap pipe 8 Performance can be improved.

Furthermore, according to the flush toilet 1 of the present embodiment, as shown in FIGS. 4 and 5, the height position H2 of the lower end 32a of the second connecting surface 32 in the rear region B of the bowl surface S is equal to the bowl surface S. It is set so that it may change continuously along the circumferential direction of the rear region B. As a result, the height position H2 of the lower end 32a of the second connection surface 32 is one side in the rear region B of the bowl surface S (the right side (second rim spout) when the toilet body 2 in FIGS. 4 and 5 is viewed from the front. 22 side)) along the circumferential direction and gradually descends to the vicinity of the substantially central region C1 in the left-right direction in the rear region B of the bowl surface S, and then the other side in the rear region B of the bowl surface S It can gradually rise toward the left side when the toilet body 2 of FIGS. 4 and 5 is viewed from the front.
Accordingly, since a rapid change in the height position H2 of the second connection surface 32 can be suppressed, the splashing of the cleaning water flowing in the vicinity of the second connection surface 32 in the rear region B of the bowl surface S and the energy loss associated therewith. Can be suppressed.

Moreover, according to the flush toilet 1 by this embodiment, as shown to FIG. 6A and FIG. 6C-FIG. 6F, 1st distance d6 of the perpendicular direction from the lower end 18a of the 1st standing wall surface S7 of the rim | limb 18 to the upper end 18b. However, it is set substantially the same over the front area F and the left and right side areas L and R of the bowl surface S.
Accordingly, as shown in FIG. 7, the cleaning water f1 flowing along the first standing wall surface S7 of the front region F and the right side region R of the bowl surface S is rearward of the bowl surface S in a state where energy loss is suppressed. It can flow into region B.
In addition, as shown in FIGS. 6B and 8, the washing water f <b> 1 that flows along the first standing wall surface S <b> 7 of the rim 18 flows into the rear region B of the bowl surface S and enters the second standing wall surface S <b> 12 of the rim 18. When flowing along, the flow of the cleaning water f2 may change and water splashing may occur. However, the second vertical distance d7 from the lower end 18a to the upper end 18b of the second standing wall surface S12 in the rear region B of the bowl surface S is such that the front region F of the bowl surface S and the rims 18 of the left and right side regions L, R Since it is set larger than the first distance d6 in the vertical direction from the lower end 18a to the upper end 18b of the first standing wall surface S7, water splashing can be effectively suppressed.

Furthermore, according to the flush toilet 1 according to the present embodiment, as shown in FIG. 1, the first rim water spouting port 20 has a lateral region on one side with respect to the central axis Y extending in the front-rear direction of the bowl surface S ( It is arranged in the vicinity of the region that changes from the left side region L) shown in FIG. More specifically, the first rim spout 20 is disposed on the rear side in the front region F in front of the boundary position P1 of the front region F of the bowl 6.
As a result, the cleaning water f1 (see FIG. 7) immediately after water discharge from the first rim spout 20 is in a state where energy loss is relatively likely to occur and water splashing is likely to occur.
However, as shown in FIGS. 6A to 6F, circumferential regions (front region F, rear region B, and left and right side regions L, R including front and rear ends 6a, 6b and left and right ends 6c, 6d on the bowl surface S are shown. ), The curvature radii ρ1 and ρ2 in the vertical direction of the curved surfaces S5 and S6 of the coupling surfaces 30 and 32 are set to be substantially the same (ρ1 = ρ2 or ρ1≈ρ2). Thereby, after the wash water f1 (see FIG. 7) immediately after water discharge from the first rim spout 20 flows into the front region F of the bowl surface S, the energy loss and water splashing are suppressed stably. Can be swiveled.
As shown in FIGS. 1 and 3, the second rim spout 22 has a lateral region (right region R) on the other side of the bowl surface S with respect to a central axis Y extending in the front-rear direction of the bowl surface S. Is arranged in the vicinity of the region changing from the rear region B to the rear region B. More specifically, the second rim water spouting port 22 is disposed on the rear side in the right side region R ahead of the boundary position P2 on the front side of the rear region B of the bowl 6.
Accordingly, as shown in FIGS. 7 and 8, the washing water f2 discharged from the second rim spouting port 22 is subjected to a certain amount of centrifugal force along the shelf 16 in the rear region B of the bowl surface S. Will flow in.
However, as shown in FIGS. 2 to 5 and 6B, the height position H2 of the lower end 32a of the second connecting surface 32 in the rear region B of the bowl surface S is equal to the front region F and the left and right ends 6c of the bowl surface S. , 6d and the left and right side regions L, R are provided at positions lower than the height position H1 of the first connecting surface 30.
Accordingly, as shown in FIGS. 7 and 8, the washing water f2 flowing on the shelf 16 in the rear region B of the bowl surface S is thereafter in the vicinity of the central region C1 in the left-right direction in the rear region B of the bowl surface S. The flow f3 or the flow f4 is smoothly guided into the water reservoir (recessed portion 12) below the bowl surface S while maintaining high energy. These washing water flows f3 and f4 form a longitudinal swirl flow f5 in the concave portion 12 of the bowl 6, and the stored water W0 in the concave portion 12 can be vigorously stirred.
Then, as shown in FIG. 8, the washing water flows into the drain trap pipe 8 by the flowing water action caused by the vertical water drop in the concave portion 12 of the bowl 6, and the filth can be washed away.

Moreover, according to the flush toilet 1 by this embodiment, as shown in FIGS. 2-5, the height position H1 of the lower end 30a of the 1st connection surface 30 and the height position of the lower end 32a of the 2nd connection surface 32 are shown. The vertical distance d5 between H2 and H2 is preferably set to 3 mm to 15 mm, and most preferably set to 5 mm to 10 mm.
Therefore, as shown in FIGS. 4, 5, and 7, it is possible to effectively suppress the splashing of the cleaning water f <b> 2 flowing in the vicinity of the second connection surface 32 in the rear region B of the bowl surface S and the energy loss associated therewith. it can.

In the flush toilet 1 according to the present embodiment described above, the example applied to the so-called “wash-out flush toilet” has been described, but the flush toilet in a form other than the wash-out flush toilet It can also be applied to toilets.
In other words, as a flush toilet in a form other than a flush toilet bowl, the so-called “siphon flush tank” is used to suck in filth in the bowl using the siphon action and discharge it from the drain trap line to the outside at once. It can also be applied to a toilet bowl.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 4 Water channel 4a Water channel inlet 6 Bowl 6a Front end in bowl, front end of bowl surface 6b Rear end in bowl, rear end of bowl surface 6c Left end in bowl, left end of bowl surface 6d Left end of bowl, left end of bowl surface 8 Drain trap pipe (drainage)
8a Drain trap pipe inlet 8b Drain trap pipe descending path 8c Drain trap pipe rising path 10 Wash water tank device (wash water source)
10a Water storage tank 12 Recessed part (water storage part)
12a Bottom wall surface of recess 12b Side wall surface of recess 12c Rear wall surface of recess 14 Soil receiving surface 16 Shelf 16a Outer edge of shelf surface 18 Rim 18a Lower edge of rim, lower end of rim, lower end of lower standing wall 18b upper surface of rim 18c rim The upper end of the lower vertical wall surface, the lower end of the upper vertical wall surface of the rim 20 First rim water discharge port (water discharge portion, first water discharge port)
22 2nd rim water outlet (water discharge part, 2nd water discharge port)
24 common water passage 26 first rim water passage 28 second rim water passage 28a inlet of second rim water passage 28b outer water passage 28c of second rim water passage 28c bent water passage 28d of second rim water passage 28d second rim water passage 28d Inside water passage 30 First connection surface (connection surface)
30a Lower end of the first connection surface 30b Upper end of the first connection surface 32 Second connection surface (connection surface)
32a Lower end of the second connecting surface 32b Upper end of the second connecting surface B Rear region of the bowl C1 Horizontal central region in the rear region of the bowl surface d1 Height of the lower end of the first connecting surface from the height position of the uppermost end surface of the rim First predetermined distance downward in the vertical direction to the vertical position d2 second predetermined distance downward in the vertical direction from the height position of the uppermost end surface of the rim to the height position of the lower end of the first connecting surface d3 of the lower end of the first connecting surface Vertical distance from the height position to the upper end height position d4 Vertical distance from the lower end height position of the second connection surface to the upper end height position d5 Height position of the lower end of the first connection surface Vertical distance from the height position of the lower end of the second connecting surface d6 Vertical distance from the lower end to the upper end of the first standing wall (first distance)
d7 Vertical distance from the lower end to the upper end of the second standing wall (second distance)
L Left side region of bowl M Boundary line between filth receiving surface and recess F Front region of bowl f0 Flow of cleaning water in common water passage f1 Flow of cleaning water discharged from first rim spout (swirl flow)
f2 Flow of cleaning water discharged from the second rim spout f3 Most flow of cleaning water discharged from the second rim spout f4 Partial flow of cleaning water discharged from the second rim spout f5 Vertical turning Flow H0 Height position of the uppermost end surface of the rim H1 Height position of the lower end of the first connecting surface (first height position)
H2 Height position of the lower end of the second connection surface (second height position)
H3 Height position of the upper end of the first connecting surface H4 Height position of the upper end of the second connecting surface H5 Minimum height position of the lower end of the second connecting surface in the center region in the left-right direction in the rear region of the bowl surface O Center P1 Boundary position between the front area of the bowl and the left and right side areas a predetermined distance along the central axis in the horizontal front-rear direction from the front end of the bowl P2 A predetermined distance along the central axis in the horizontal front-rear direction from the rear end of the bowl The boundary position between the rear region of the bowl and the left and right side regions P3 The position of the first rim spout P4 The position of the second rim spout P5 The rear end position of the recess P6 The rear end position of the reservoir surface P7 The first connection surface 1 height position P8 second height position of the second connecting surface R right side region of the bowl r1 representative radius of curvature near the front end in plan view of the inner peripheral surface of the rim in the front region of the bowl r2 of the rear region of the bowl In plan view of the inner peripheral surface of the rim Typical radius of curvature near the rear end r3 Typical radius of curvature near the left end in the plan view of the inner peripheral surface of the rim in the left side region of the bowl r4 In plan view of the inner peripheral surface of the rim in the right side region of the bowl Typical radius of curvature near the right edge S Bowl surface S1 Inner circumferential surface of rim (standing wall)
S2 Wall surface in recess S3 Full surface of filth receiving surface S4 Surface of shelf (shelf surface)
S5 Curved surface of the first connecting surface between the outer edge of the shelf and the lower edge of the rim in the front area and the left and right side area of the bowl surface. S6 The first curved surface between the outer edge of the shelf and the lower edge of the rim in the rear area of the bowl surface. Curved surface of two connecting surfaces S7 First standing wall surface S8 Lower standing wall surface of the first standing wall S9 Upper standing wall surface of the first standing wall S10 Rising portion of the upper standing wall surface of the first standing wall S11 Upper standing wall surface of the first standing wall Overhang portion S12 Second standing wall surface S13 Lower standing wall surface of second standing wall S14 Upper standing wall surface of second standing wall S15 Rising portion of upper standing wall surface of second standing wall S16 Of upper standing wall surface of second standing wall surface Overhang part U U-turn part of the 2nd rim waterway W0 Reservoir WL Reservoir water level (reservoir surface)
X Horizontal center axis in the horizontal direction of the bowl Y Center axis in the horizontal direction of the bowl Y0 Total length distance in the front-rear direction from the front end to the rear end in the bowl Y1 Boundary position between the front end and the left and right side areas in the bowl Distance in the front-rear direction Y2 Distance in the front-rear direction from the rear end in the bowl to the boundary position between the rear region and the left and right side regions Y3 Distance in the front-rear direction from the front end in the bowl to the first rim spout Y4 In the bowl Distance in the front-rear direction from the rear end to the second rim spout Z Vertical axis of the vertical direction passing through the center of the bowl ρ1 Vertical direction of the curved surface in the elevational view of the first connecting surface in the front area and the left and right side areas of the bowl Radius of curvature ρ2 Curvature radius of the curved surface in the elevational view of the second connecting surface in the rear region of the bowl

Claims (7)

A flush toilet that is washed with wash water supplied from a wash water source and discharges filth,
A rim formed on the upper edge, a filth receiving surface for receiving the filth, and a shelf formed between the filth receiving surface and the rim to form a bowl-shaped bowl surface and collect below it. A bowl forming the water part;
A drainage channel connected to the bottom of the bowl to discharge filth,
A water discharge part that is provided on the rim and discharges cleaning water to the shelf to form a swirling flow on the bowl surface;
The bowl surface includes a connecting surface that connects the outer edge of the shelf and the lower edge of the rim with a curved surface,
In the circumferential area including front and rear and left and right ends of the bowl surface, the connecting surface is set to have substantially the same curvature radius in the vertical direction of the curved surface of the connecting surface,
The connection surface includes a first connection surface provided at substantially the same first height position in the front region on the bowl surface and the left and right side regions including both left and right ends, and the first connection surface in the rear region on the bowl surface. A flush toilet comprising: a second connecting surface provided at a second height position lower than the first height position.   The lower end of the first connecting surface is provided at substantially the same height position below the upper surface of the rim by a predetermined distance across the front region and the left and right side regions of the bowl surface, The flush toilet according to claim 1, wherein the lower end is provided at a height position lower than the lower end of the first connecting surface.   The flush toilet according to claim 2, wherein the height position of the lower end of the second connection surface is set to the lowest height position in a substantially central region in the left-right direction within the rear region of the bowl surface.   The flush toilet according to claim 3, wherein the height position of the second connection surface is set so as to continuously change along a circumferential direction in a rear region of the bowl surface. The rim has a first standing wall surface formed so that an inner peripheral surface thereof rises from an upper end of the first connection surface to an upper surface of the rim, and an inner peripheral surface of the rim extends from the upper end of the second connection surface. A second standing wall formed so as to rise up to the upper surface of the rim,
The first distance in the vertical direction from the lower end to the upper end of the first standing wall surface is set substantially the same over the front area and the left and right side areas of the bowl surface,
5. The second distance in the vertical direction from the lower end to the upper end of the second standing wall surface in the rear region of the bowl surface is set to be larger than the first distance. Flush toilet.   The water discharge portion includes a first water discharge port disposed in the vicinity of a region changing from a lateral region on one side to the front region with respect to a central axis extending in the front-rear direction of the bowl surface, and a front-rear direction of the bowl surface 6. A flushing size according to claim 1, further comprising: a second water discharge port disposed in the vicinity of a region that changes from the lateral region on the other side to the rear region with respect to the central axis that extends. Toilet bowl.   The flush toilet according to any one of claims 1 to 6, wherein a vertical distance between the lower end of the first connecting surface and the lower end of the second connecting surface is set to 3 mm to 15 mm.

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