JP2018123549A - Flush toilet bowl - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flush toilet bowl that facilitates flowing down of flushing water to an inner side of a bowl diameter, in a portion at an immediately downstream side of a water discharge port.SOLUTION: A bowl surface 20 includes a shelf part and an upper wall surface 23. The shelf part is formed in an annular shape when seen in a planar view, and the upper wall surface 23 rises from an edge part on an outer side of a bowl diameter on a top surface 40 of the shelf part. A covering wall part 42 rises from an edge part on an inner side of the bowl diameter, at a part of the top surface 40 in a bowl circumferential direction. A space between the covering wall part 42 and the upper wall surface 23 is a water supply space 5, and a portion of the top surface 40 corresponding to the water supply space 5 is a water supply surface 50. The upper wall surface 23 at a lower part of the water supply space 5 has a protrusion 7 protruding toward the inner side of the bowl diameter, a top surface of the protrusion being the water supply surface 50. A main inclined surface 71 inclines downward on the inner side of the bowl diameter, and a downward inclination angle 731 of an upper main inclined surface 73 is smaller than a downward inclination angle 721 of a lower main inclination surface 72.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a flush toilet.

  Conventionally, a flush toilet having a shelf on a part of a bowl surface is known (see, for example, Patent Document 1).

  The shelf is formed in an annular shape in plan view along the upper edge opening in a portion below the upper edge opening of the bowl surface, and the upper surface faces upward. While the cleaning water discharged in the circumferential direction of the bowl is placed on the upper surface of the shelf and circulates, the cleaning water is caused to flow down to the inside of the bowl diameter (bottom side of the central portion of the bowl surface).

  On the top surface of the shelf, the cover wall protrudes upward from the inner end of the bowl diameter in part of the bowl circumferential direction, and the space covered by the cover wall on the shelf is supplied with water from the water supply unit Water supply space.

JP 2008-138419 A

  In the conventional flush toilet, the water supplied from the water supply section to the water supply space is directed from the water outlet at the downstream end of the water supply space (downstream end of the covering wall section) to the upper surface of the shelf in the circumferential direction of the bowl. Discharged. At this time, it was difficult for the washing water to flow down to the inside of the bowl diameter at the portion immediately downstream of the water outlet.

  The present invention has been invented in view of the above-described conventional problems, and an object of the present invention is to provide a flush toilet in which flush water can easily flow down to the inside of the bowl diameter at a portion immediately downstream of the water outlet. There is.

  In order to solve the above-described problems, a flush toilet according to an embodiment of the present invention includes a bowl surface that opens upward to receive filth and washing water.

  The bowl surface has a shelf portion and an upper wall surface. The shelf is formed in an annular shape or a C shape in plan view along the upper edge opening at a portion lower than a predetermined height from the upper edge opening of the bowl surface, and has an upper surface facing upward. The upper wall surface rises from the end of the upper surface of the shelf on the outer side of the bowl diameter, and the normal line faces the inner side of the bowl diameter.

  The flush toilet has a cover wall portion that protrudes upward from an end portion on the inner side of the bowl diameter at a part of the upper surface of the shelf in the circumferential direction of the bowl.

  A space sandwiched between the cover wall portion and the upper wall surface on the upper surface of the shelf portion is a water supply space to which water from the water supply portion is supplied, and corresponds to the water supply space on the upper surface of the shelf portion. The part to do becomes the water supply surface. A portion of the upper surface of the shelf that is downstream of the water supply surface is a shelf surface that is not covered by the cover wall.

  The end in the bowl circumferential direction, which is the downstream end of the water supply space, serves as a spout for discharging water to the shelf surface.

  The upper wall surface of the water supply space has a protrusion that protrudes inward of the bowl diameter and whose upper surface serves as the water supply surface.

  The protruding portion has a main inclined surface that is located over the entire length of the water supply space in the inner and outer directions of the bowl diameter, and the water supply surface, which is the upper surface, is inclined downward toward the inside of the bowl diameter.

  The main inclined surface has a lower main inclined surface located inside the bowl diameter, and an upper main inclined surface located outside the bowl diameter from the lower main inclined surface, and a downward inclination angle of the upper main inclined surface is the It is smaller than the downward inclination angle of the lower main inclined surface.

  In the flush toilet according to one aspect of the present invention, the wash water flowing in the lower part of the water supply space is decelerated by the protrusion, and the wash water easily flows down to the inside of the bowl diameter at a portion immediately downstream of the water discharge port.

FIG. 1 is a plan view of a flush toilet according to the first embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a plan view of the bowl portion of the flush toilet. FIG. 5: is the perspective view which looked at the water supply space periphery of the bowl part same as the above from diagonally forward. FIG. 6 is a sectional view of the periphery of the water supply space of the bowl portion as seen from the front in the bowl circumferential direction.

  The present invention relates to a flush toilet bowl, and more particularly to a flush toilet bowl having a shelf on a part of a bowl surface.

  Hereinafter, the flush toilet bowl of 1st embodiment is demonstrated based on FIGS.

  As shown in FIGS. 1 to 3, the flush toilet 1 includes a bowl portion 2 and a rim portion 3.

  The bowl portion 2 has an inner surface serving as a bowl surface 20 that receives dirt and cleaning water, and opens upward. The bowl portion 2 has a bottom portion 21 at the center, and a drain port portion 22 is provided at the bottom portion 21. The bottom 21 may not be formed at the exact center of the bowl 2.

  Here, the front, rear, left and right are defined as shown in FIGS. In the flush toilet 1, the direction of the user sitting on the toilet seat (not shown) is assumed in design, and the direction in which the user sitting on this toilet seat faces is the front. Back, left, and right are determined with respect to the front.

  As shown in FIGS. 2 and 3, the drain port portion 22 is a cylindrical member integrally formed so that the inner space is continuous by connecting the horizontal tube portion 222 to the rear portion of the vertical tube portion 221. . An upper end opening 220 of the vertical cylinder portion 221 that is the upstream end of the drain port portion 22 opens upward at the bottom portion 21 of the bowl portion 2. A rear end opening of the horizontal cylindrical portion 222 that is the downstream end of the drain port portion 22 opens rearward.

  Although not shown, one end (base end) of the cylindrical movable trap in the axial direction is connected to the rear end of the horizontal cylindrical portion 222. The movable trap has a deformable trap cylinder formed of rubber, resin or the like.

  The position and direction of the other end (tip) in the axial direction of the trap cylinder are changed by the motor. The trap is configured in such a posture that the tip of the trap cylinder is located at the upper position and the tip opening faces upward, so that the accumulated water can be formed in the bowl portion 2. In addition, the trapped water in the bowl portion 2 can be discharged together with the filth in a posture in which the tip of the trap cylinder is located at the lower position and the tip opening faces downward.

  Note that such a movable trap need not be provided, and a fixed trap cylinder may be connected to the rear end of the horizontal cylinder portion 222.

  The flush toilet 1 is integrally incorporated together with the movable trap to constitute a toilet device. In addition to the movable trap, the toilet device may include various devices such as a deodorizing device and a local cleaning device as appropriate.

  A rim portion 3 is provided on the upper edge of the bowl portion 2. The toilet seat is placed on the upper surface 31 of the rim portion 3. As shown in FIGS. 2 and 3, the inner edge of the rim portion 3 is located inside the upper end portion of the bowl portion 2 (upper edge opening 201 of the bowl surface 20) in plan view.

  Furthermore, in the first embodiment, as shown in FIGS. 2 and 3, a skirt portion 11 made of resin is integrally fixed to the rim portion 3. The skirt portion 11 covers the front, left, and right sides of the bowl portion 2. In 1st embodiment, the bowl part 2, the rim | limb part 3, and the skirt part 11 are integrally formed, and the flush toilet 1 is comprised.

  Further, in the first embodiment, although not shown, a metal frame portion that supports the bowl portion 2, the rim portion 3, and the skirt portion 11 integrally formed of resin is provided.

  In the first embodiment, the flush toilet 1 is provided with the rim 3 and the skirt 11, but the flush toilet 1 may not be provided with the rim 3 and the skirt 11.

  As a part of the bowl surface 20, as shown in FIG. 4, a shelf for allowing the cleaning water passed in the bowl circumferential direction (arrow 10 in FIG. 4) to flow along the upper edge opening of the bowl surface 20. Part 4.

  The shelf 4 is formed in an annular shape in plan view along the upper edge opening 201 at a portion below the upper edge opening 201 of the bowl surface 20 by a predetermined height (30 mm below the upper edge opening 201).

  In 1st embodiment, although the shelf part 4 is formed in the part below 30 mm from the upper edge opening 201 of the bowl surface 20, the said numerical value may be 5-100 mm etc., for example, and is not limited.

  As shown in FIGS. 2 and 3, the shelf 4 has an upper surface 40 facing upward. The upper surface 40 faces in a direction in which the normal line forms an angle of 20 degrees or less with respect to the vertically upward direction. In the first embodiment, the upper surface 40 and the portion immediately below the upper surface 40 of the bowl surface 20 are continuous with a smooth curve in a cross section perpendicular to the circumferential direction of the bowl, but are not particularly limited.

  As shown in FIGS. 2 and 3, the bowl surface 20 rises as a part from the end of the upper surface 40 of the shelf 4 on the outer side of the bowl diameter (that is, the opposite side to the center side of the bowl surface 20 in plan view). An upper wall surface 23 is provided. The upper wall surface 23 is formed in an annular shape in plan view, and its normal line faces the inside of the bowl diameter. The normal line of the upper wall surface 23 forms an angle of 0 to 40 degrees upward with respect to the horizontal direction. The upper end of the upper wall surface 23 becomes the upper edge opening 201 of the bowl surface 20. In the first embodiment, the rim portion 3 described above is provided so as to be continuous with the upper edge opening 201 of the bowl portion 2. An upper wall surface 32 in which the normal line of the rim portion 3 faces downward from the horizontal direction is located above the upper surface 40 of the shelf portion 4.

  The flush toilet 1 has a covering wall portion 42 protruding upward from an end portion on the inner side of the bowl diameter at a part of the upper surface 40 of the shelf portion 4 in the circumferential direction of the bowl. In the first embodiment, as shown in FIG. 4, a cover wall portion 42 having a central angle in the bowl circumferential direction of about 15 to 20 degrees is provided at the rear side portion on the right side of the bowl surface 20.

  A space sandwiched between the covering wall portion 42 and the upper wall surface 23 on the upper surface 40 of the shelf portion 4 is a water supply space 5 to which water from the water supply portion 6 is supplied. The water supply unit 6 is supplied with water from a water source such as a water supply or a hot water storage tank. The water supply unit 6 has a water supply outlet 60 that discharges water at the downstream end, and the downstream end is introduced into the water supply space 5. In addition, a water supply nozzle (not shown) as the water supply unit 6 is disposed in advance in the water supply space 5, and an external water supply pipe (not shown) for supplying water from a water source is connected to the water supply nozzle. It may be. Further, the water supply outlet 60 may be formed integrally with a portion constituting the water supply space 5 without using the water supply nozzle.

  A portion corresponding to the water supply space 5 on the upper surface 40 of the shelf 4 is a water supply surface 50. A portion of the upper surface 40 of the shelf 4 on the downstream side of the water supply surface 50 is a shelf surface 43 that is not covered by the cover wall 42.

  A water supply outlet position at which the water supply outlet 60 is disposed at a predetermined position and orientation is determined at a portion on one end side in the bowl circumferential direction, which is the upstream end of the water supply space 5. 3 and 4 show a state where the water supply section 6 is arranged in the water supply space 5 and the water supply outlet 60 is arranged at a predetermined position and orientation at the water supply outlet position. In 1st embodiment, although the internal diameter (diameter) of the feed outlet 60 is 10 mm, it is not limited to the said numerical value in particular. The predetermined position of the water supply outlet 60 is in the vicinity of the rear end portion of the water supply space 5 as shown in FIGS. 4 and 5 in the bowl circumferential direction. In addition, as shown in FIG. 6, the predetermined position of the water supply outlet 60 is formed such that the lower end is slightly higher than the water supply surface 50 (for example, 1 to 2 mm, but not particularly limited to the above numerical value). . The lower end of the water supply outlet 60 may be positioned on the water supply surface 50. Further, the predetermined position of the water supply outlet 60 is the central portion of the water supply space 5 as shown in FIG. In addition, the water supply outlet 60 does not need to be located in the center part in the bowl diameter inside / outside direction of the water supply surface 50. FIG.

  As shown in FIG. 4, the predetermined direction of the water supply outlet 60 is that the direction of the cleaning water discharged from the water supply outlet 60 (see arrow 61 in the figure) is the downstream side (front side in FIG. 4) in the bowl circumferential direction. It is the direction.

  As shown in FIGS. 4 and 5, the other end in the circumferential direction of the bowl, which is the downstream end of the water supply space 5, becomes a water discharge port 44 for discharging water to the shelf surface 43.

  As shown in FIG. 6, the upper wall surface 23 corresponding to the lower portion of the water supply outlet position in the bowl circumferential direction when the water supply space 5 is viewed from the water discharge port 44 side protrudes inward of the bowl diameter, and the upper surface thereof becomes the water supply surface 50. It has a protrusion 7. In 1st embodiment, the position in the bowl circumferential direction of the protrusion part 7 is an area | region connected to the water outlet 44 of the water supply space 5, as shown in FIG. 4, FIG. The length of the protrusion 7 in the bowl circumferential direction is about half of the length of the water supply space 5 in the bowl circumferential direction. The position and length of the protruding portion 7 in the bowl circumferential direction are not limited to the above.

  As shown in FIG. 6, the water supply space 5 is set to the lower water supply space 51 using the middle of the height of the protrusion 7 (in the first embodiment, the height is half the height of the protrusion 7 but not limited) as a virtual boundary. And divided into the upper water supply space 52. In other words, a particularly narrow region in the lower part of the upper and lower range where the protruding portion 7 of the water supply space 5 is located is referred to as a lower water supply space 51, and a region above the lower water supply space 51 in the water supply space 5 is referred to as an upper water supply space 52. The horizontal length 511 (the length in the bowl diameter direction) of the lower water supply space 51 is formed shorter than the horizontal length 521 of the upper water supply space 52 as viewed in the bowl circumferential direction.

  As shown in FIG. 6, the upper wall surface 23 corresponding to the lower portion of the water supply outlet position in the bowl circumferential direction when the water supply space 5 is viewed from the water discharge port 44 side protrudes inward of the bowl diameter, and the upper surface thereof becomes the water supply surface 50. It has a protrusion 7. The protrusion 7 is located over the entire length of the water supply space 5 in the inner and outer directions of the bowl diameter, and the water supply surface 50 that is the upper surface thereof has a main inclined surface 71 that inclines downward toward the inside of the bowl diameter.

  As shown in FIGS. 5 and 6, the main inclined surface 71 has a lower main inclined surface 72 positioned on the inner side of the bowl diameter and an upper main inclined surface 73 positioned on the outer side of the bowl diameter from the lower main inclined surface 72. As shown in FIG. 6, the downward inclination angle 731 that inclines down to the inside of the bowl diameter of the upper main inclined surface 73 is smaller than the down inclination angle 721 that inclines to the inside of the bowl diameter of the lower main inclined surface 72. The downward inclination angle 731 of the upper main inclined surface 73 is 25 to 30 degrees, but is not particularly limited to the above numerical value. The downward inclination angle 721 of the lower main inclined surface 72 is 50 to 60 degrees, but is not particularly limited to the above numerical value. That is, the downward inclination angle of the main inclined surface 71 that inclines to the inside of the bowl diameter is 25 to 60 degrees, but is not particularly limited to the above numerical value.

  As shown in FIG. 5, the upper main inclined surface 73 is inclined downward toward the downstream side of the bowl circumferential direction (see arrow 732), and the inclination angle with respect to the horizontal direction is 5 to 20 degrees. It is not limited to the said numerical value.

  Further, as shown in FIG. 5, the upper main inclined surface 73 is formed such that the length 733 in the inner and outer directions of the bowl diameter becomes shorter toward the upstream side.

  Further, as shown in FIG. 6, the lower main inclined surface 72 and the upper main inclined surface 73 are continuous by a smooth curve in the cross section.

  As shown in FIG. 5, the shelf surface 43 is located on the outside of the bowl diameter and is connected to the upper main inclined surface 73, and the shelf surface 43 protrudes upward and its upper surface constitutes the shelf surface 43. The outer protrusion 45 is formed. The outer shelf surface 450 is inclined downward toward the downstream side in the bowl circumferential direction (see arrow 451), and the inclination angle with respect to the horizontal direction is 5 to 20 degrees, but is not particularly limited to the above numerical values.

  The outer shelf surface 450 is continuous with the upper main inclined surface 73, and the outer shelf surface 450 is also inclined downward toward the inside of the bowl diameter (see arrow 452) in the same manner as the upper main inclined surface 73. Although the inclination angle with respect to is 25 to 30 degrees, it is not particularly limited to the above numerical values.

  Further, the shelf surface 43 is located on the inner diameter side of the bowl and is connected to the inner connecting region connected to the lower main inclined surface 72. The inner projection 46 protrudes upward and the upper surface thereof becomes the inner shelf surface 460 constituting the shelf surface 43. Have The inner shelf surface 460 is inclined downward toward the inside of the bowl diameter (see arrow 461), and the inclination angle with respect to the horizontal direction is 40 to 60 degrees, but is not particularly limited to the above numerical values.

  The inner shelf surface 460 is continuous with the outer shelf surface 450 in the bowl diameter inner and outer directions, and is continuous with the lower main inclined surface 72 in the bowl circumferential direction. The inner shelf surface 460 is inclined downward toward the downstream side in the bowl circumferential direction (see arrow 462), and the inclination angle with respect to the horizontal direction is 5 to 20 degrees, but is not particularly limited to the above numerical values.

  The shelf 4 is formed in an annular shape in plan view. Therefore, the wash water discharged from the water discharge port 44 to the shelf surface 43 circulates around the shelf surface 43 while being guided by the upper wall surface 23 and reaches the inside of the bowl diameter of the covering wall portion 42. Further, when the washing water flows downstream from the covering wall portion 42, it moves to the outside of the bowl diameter by centrifugal force and tries to enter a portion immediately downstream of the water discharge port 44. When the circulating cleaning water enters the portion immediately downstream of the water outlet 44, it collides with the cleaning water immediately after being discharged from the water outlet 44.

  Therefore, the flush toilet 1 changes the traveling direction of the water discharged from the water outlet 44 and circulated around the shelf surface 43 to the inside of the bowl diameter from the covering wall portion 42 of the shelf 4 to the inside of the bowl diameter. Have The guide portion 8 is configured integrally with the inner protrusion 46 so that the configuration can be simplified. Moreover, the inner protrusion 46, the outer protrusion 45, and the protrusion 7 which have the guide part 8 integrally are comprised integrally, and it is a still simpler structure.

  The guide portion 8 has a guide surface 80 that is positioned on the inner side of the bowl diameter toward the downstream side. The upper surface of the guide surface 80 is inclined downward toward the inside of the bowl diameter, and the inclination angle with respect to the horizontal direction is 40 to 60 degrees, but is not particularly limited to the above numerical values.

  In the flush toilet 1 of the first embodiment, the wash water is first discharged from the water supply outlet 60 in the direction of the arrow 61 as shown in FIGS. As shown in FIG. 6, of the cleaning water discharged from the water supply outlet 60, most of the cleaning water that passes through the upper water supply space 52 jumps over the protruding portion 7 and the remaining part of the cleaning water It rides on the water supply surface 50 on the upper surface of the protrusion 7, passes through the protrusion 7, and is discharged from the water outlet 44 shown in FIG. 5 to the shelf surface 43. For this reason, as shown in FIG. 6, the wash water that passes through the upper water supply space 52 can pass through the upper water supply space 52 with a small horizontal resistance 521 without the protruding portion 7 being positioned with a small flow resistance. It is possible to circulate around the shelf surface 43 without greatly reducing the flow velocity.

  On the other hand, of the wash water discharged from the feed water outlet 60, the wash water that passes through the portion of the lower feed water space 51 has a horizontal length 511 shorter than the horizontal length 521 of the upper feed water space 52 due to the protrusion of the protrusion 7. It passes through the lower water supply space 51 whose flow path resistance is larger than that of the upper water supply space 52. For this reason, the wash water that passes through the portion of the lower water supply space 51 is greatly scraped off when passing through the side of the protrusion 7, and is discharged from the water outlet 44 to the shelf surface 43, and then the shelf surface 43. Is less likely to circulate and easily flows down to the inside of the bowl diameter.

  Thereby, in the part immediately downstream of the water discharge port 44, a larger amount of washing water flows down to the inside of the bowl diameter than in the case where there is no protrusion 7, and the bowl surface 20 inside the bowl diameter immediately downstream of the water discharge port 44. Dirt that adheres to the surface is easily washed away.

  Further, the protruding portion 7 has a lower main inclined surface 72 and an upper main inclined surface 73, and the downward inclination angle 731 of the upper main inclined surface 73 is formed smaller than the downward inclination angle 721 of the lower main inclined surface 72. . For this reason, a part of the wash water that passes through the upper water supply space 52 rides on the water supply surface 50 on the upper surface of the projecting portion 7, and at this time, the wash water that flows downstream on the upper main inclined surface 73 is It does not receive a large force toward the inside of the bowl diameter. Accordingly, the cleaning water that has flowed from the upper main inclined surface 73 to the shelf surface 43 can easily circulate around the shelf surface 43.

  Further, an outer protrusion 45 having an outer shelf surface 450 connected to the upper main inclined surface 73 is provided, and the outer shelf surface 450 is inclined downward toward the downstream side in the circumferential direction of the bowl. It is suppressed that the washing water suddenly descends (falls) to the shelf surface 43 and the kinetic energy of the washing water is lost.

  Further, an inner protrusion 46 having an inner shelf surface 460 connected to the lower main inclined surface 72 is provided, and the inner shelf surface 460 is inclined downward toward the inside of the bowl diameter. In the portion, the cleaning water discharged from the water discharge port 44 to the shelf surface 43 is more likely to flow down to the inside of the bowl diameter.

  Further, the upper main inclined surface 73 is inclined downward toward the downstream side in the bowl circumferential direction, and is formed such that the length 733 in the bowl diameter inside / outside direction becomes shorter toward the upstream side. For this reason, since the flow path resistance on the upper main inclined surface 73 of the lower water supply space 51 changes continuously, it is suppressed that the kinetic energy of washing water is largely lost due to a sudden change in the flow path resistance.

  The lower main inclined surface 72 and the upper main inclined surface 73 are continuous with a smooth curve in the cross section. For this reason, since the flow path resistance in the part corresponding to the lower main inclined surface 72 and the upper main inclined surface 73 of the lower water supply space 51 continuously changes, the movement of the washing water due to the rapid change of the flow path resistance Energy loss is suppressed.

  Further, the cleaning water that has circulated around the shelf surface 43 and reached the inside portion of the bowl diameter of the covering wall portion 42 by the guide portion 8 is discharged from the spout 44 because the traveling direction is changed to the inside of the bowl diameter. Collision with the washing water immediately after is suppressed.

  Further, the flow resistance of the lower water supply space 51 is continuously changed in the vertical direction by the main inclined surface 71, and the loss of kinetic energy of the washing water due to the rapid change of the flow resistance in the vertical direction is suppressed. .

  As described above, as apparent from the first embodiment described above, the flush toilet 1 of the first aspect includes the bowl surface 20 that opens upward to receive filth and washing water.

  The bowl surface 20 has a shelf 4 and an upper wall surface 23. The shelf 4 is formed in an annular shape or a C shape in plan view along the upper edge opening 201 at a portion lower than the upper edge opening 201 of the bowl surface 20 by a predetermined height, and has an upper surface 40 facing upward. The upper wall surface 23 rises from the end of the upper surface 40 of the shelf 4 on the outer side of the bowl diameter, and the normal line faces the inner side of the bowl diameter.

  The flush toilet 1 has a covering wall portion 42 protruding upward from an end portion on the inner side of the bowl diameter at a part of the upper surface 40 of the shelf portion 4 in the circumferential direction of the bowl.

  A space sandwiched between the covering wall portion 42 and the upper wall surface 23 on the upper surface 40 of the shelf portion 4 becomes the water supply space 5 to which water from the water supply portion 6 is supplied, and the water supply space 5 on the upper surface 40 of the shelf portion 4. A portion corresponding to the water supply surface 50. A portion of the upper surface 40 of the shelf 4 on the downstream side of the water supply surface 50 is a shelf surface 43 that is not covered by the cover wall 42.

  An end in the bowl circumferential direction, which is the downstream end of the water supply space 5, becomes a water discharge port 44 that discharges water to the shelf surface 43.

  The upper wall surface 23 of the water supply space 5 has a protrusion 7 that protrudes inward of the bowl diameter and whose upper surface becomes the water supply surface 50.

The protrusion 7 has a main inclined surface 71 that is located over the entire length of the water supply space 5 in the inner and outer directions of the bowl diameter, and the water supply surface 50 that is the upper surface of the water supply space 5 is inclined downward toward the inside of the bowl diameter.
The main inclined surface 71 has a lower main inclined surface 72 located on the inner side of the bowl diameter, and an upper main inclined surface 73 located on the outer side of the bowl diameter from the lower main inclined surface 72, and the downward inclination angle of the upper main inclined surface 73. 731 is smaller than the downward inclination angle 721 of the lower main inclined surface 72.

  According to the first aspect, the wash water that passes through the portion of the lower water supply space 51 is greatly scraped off when passing through the side of the protrusion 7, and is discharged from the spout 44 to the shelf surface 43. After that, it becomes easy to flow down inside the bowl diameter.

  Further, since the downward inclination angle 731 of the upper main inclined surface 73 is formed smaller than the downward inclination angle 721 of the lower main inclined surface 72, the wash water flowing downstream on the upper main inclined surface 73 is directed toward the inside of the bowl diameter. The cleaning water does not receive a large force, and the cleaning water easily circulates around the shelf surface 43.

  The second aspect is realized by a combination with the first aspect. In the second mode, the shelf surface 43 is located outside the bowl diameter and is connected to the upper main inclined surface 73 so as to protrude upward and the upper surface thereof becomes the outer shelf surface 450 constituting the shelf surface 43. The outer shelf surface 450 has an outer protrusion 45 and is inclined downward toward the downstream side in the circumferential direction of the bowl.

  According to the 2nd aspect, it is suppressed that washing water falls from the upper main inclined surface 73 to the shelf surface 43, and the kinetic energy of washing water is lost.

  The third aspect is realized by a combination with the first aspect or the second aspect. In the third aspect, the upper main inclined surface 73 is inclined downward toward the downstream side in the bowl circumferential direction, and has a length 733 in the bowl diameter inner and outer direction that is shorter toward the upstream side.

  According to the third aspect, since the flow path resistance on the upper main inclined surface 73 of the lower feed water space 51 continuously changes, the kinetic energy of the washing water is largely lost due to a sudden change in the flow path resistance. It is suppressed.

  The fourth aspect is realized by a combination with any one of the first to third aspects. In the fourth aspect, the lower main inclined surface 72 and the upper main inclined surface 73 are continuous by a smooth curve in the cross section.

  According to the 4th mode, since channel resistance in a portion corresponding to lower main inclined surface 72 and upper main inclined surface 73 of lower water supply space 51 changes continuously, channel resistance changes abruptly. The loss of kinetic energy of washing water due to is suppressed.

DESCRIPTION OF SYMBOLS 1 Flush toilet 20 Bowl surface 201 Upper edge opening 23 Upper wall surface 4 Shelf part 40 Upper surface 42 Wall part 43 Shelf surface 44 Water outlet 45 Outer protrusion 450 Outer shelf surface 5 Water supply space 50 Water supply surface 6 Water supply part 60 Water supply outlet 7 Protrusion part 71 Main inclined surface 72 Lower main inclined surface 721 Inclination angle 73 Upper main inclined surface 731 Inclination angle

Claims (4)

It has a bowl surface that opens upward to receive filth and washing water,
The bowl surface is formed in an annular shape or a C shape in plan view along the upper edge opening at a portion lower than a predetermined height from the upper edge opening, and a shelf having an upper surface facing upward, and the shelf of the shelf An upper wall surface where the normal line rises from the upper end of the bowl diameter on the upper surface and faces the inner side of the bowl diameter,
A cover wall portion protruding upward from an end portion on the inner side of the bowl diameter on a part of the upper surface of the shelf in the circumferential direction of the bowl,
A space sandwiched between the cover wall portion and the upper wall surface on the upper surface of the shelf portion is a water supply space to which water from the water supply portion is supplied, and corresponds to the water supply space on the upper surface of the shelf portion. The portion to be the water supply surface, the portion on the downstream side of the water supply surface of the upper surface of the shelf is a shelf surface that is not covered by the cover wall portion,
The end in the bowl circumferential direction, which is the downstream end of the water supply space, serves as a spout for discharging water to the shelf surface,
The upper wall surface of the water supply space has a protrusion that protrudes inward of the bowl diameter and whose upper surface becomes the water supply surface,
The protrusion is located over the entire length of the water supply space in the bowl diameter inside and outside direction, and the water supply surface, which is the upper surface, has a main inclined surface that inclines down to the inside of the bowl diameter,
The main inclined surface has a lower main inclined surface located inside the bowl diameter, and an upper main inclined surface located outside the bowl diameter from the lower main inclined surface, and a downward inclination angle of the upper main inclined surface is the A flush toilet characterized by being smaller than the downward inclination angle of the lower main inclined surface. The shelf surface is located on the outside of the bowl diameter, and has an outer protrusion that protrudes upward and has an upper surface serving as an outer shelf surface that constitutes the shelf surface, connected to the upper main inclined surface.
The flush toilet according to claim 1, wherein the outer shelf surface is inclined downward toward the downstream side in the bowl circumferential direction.   The upper main inclined surface is inclined downward toward the downstream side in the circumferential direction of the bowl, and is formed such that the length in the inner and outer directions of the bowl diameter decreases toward the upstream side. Flush toilet.   The flush toilet according to any one of claims 1 to 3, wherein the lower main inclined surface and the upper main inclined surface are continuous by a smooth curve in a cross section.

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