Water-washable toilet

Abstract

To provide a flush type toilet bowl retaining little amount of residual water in a rim pipe.SOLUTION: A flush type toilet bowl 1 has a bowl body 10 having a concave bowl part 11 with an upper part opened and receiving washing water and a rim part 12 along an upper edge of the bowl part 11, and a rim pipe 2 with an upstream end 2a connected to a water supply source supplying washing water and with a downstream end 2b connected to a conduit 15 of the washing water formed to the rim part 12 and having a downward slope from the upstream side toward the downstream side, and further has a rim nozzle 3 attached to the downstream of the rim pipe 2. The rim nozzle 3 is preferably inclined downward from the upstream side toward the downstream side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to flush toilets. [Background technology]

[0002] Conventionally, there is known a flush toilet in which a water conduit that guides flush water to the bowl side of the toilet body is formed inside the rim part formed on the upper edge of the toilet body. To supply flush water to the bowl part, one end of the rim piping is connected to a flush water supply source and the other end to the rim part, and flush water is supplied to the bowl part through the water conduit while applying pressure from the rim piping side (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-303616 Summary of the Invention [Problem to be solved by the invention]

[0004] When the rim piping is formed roughly horizontally, residual water tends to accumulate in the rim piping while flush water is not being supplied. When residual water accumulates, there is also the problem that the residual water tends to splash out when flush water is next discharged. [Means for solving the problem]

[0005] The present disclosure relates to a flush toilet comprising a toilet body having a concave bowl portion that is open at the top and through which flush water is supplied, and a rim portion along the upper edge of the bowl portion, and rim piping that has one end connected to a water supply source that supplies flush water and the other end connected to a flush water conduit formed in the rim portion, and that has a gradient that slopes downward from the upstream side to the downstream side. [Brief explanation of the drawings]

[0006] [Figure 1]1 is a schematic plan view of a flush toilet according to an embodiment of the present invention. [Figure 2] FIG. 2 is a partial side cross-sectional view of the flush toilet of the present embodiment. [Figure 3A] FIG. 2 is a plan view of the rim piping of the present embodiment. [Figure 3B] FIG. 2 is a side cross-sectional view of the rim piping of the present embodiment. [Figure 3C] FIG. 2 is a front view of the rim piping of the present embodiment. [Figure 3D] FIG. 2 is a rear view of the rim piping of the present embodiment. [Figure 4] 1 is an enlarged partial cross-sectional view of the rim nozzle and its surroundings according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] As shown in Figures 1 and 2, a flush toilet 1 has a toilet body 10 to which flush water is supplied and which discharges waste. Connected to the toilet body 10 is a jet pipe (not shown) which supplies flush water for discharging waste into the sewer. Connected to the toilet body 10 is a rim pipe 2 which supplies flush water for cleaning the inner wall of the toilet body 10 via a rim nozzle 3 which serves as a nozzle.

[0008] The toilet body 10 has a bowl portion 11, a rim portion 12, a mounting surface 13, a chamber 14, and a water channel 15. The toilet body 10 is entirely made of ceramic. In this specification, the side of the toilet body 10 where the user is positioned is the front side, and the side opposite the front is the rear side. The front-to-rear direction refers to the direction connecting the front and rear. Flush water is supplied from the rear side of the toilet body 10.

[0009] The bowl portion 11 is formed in a concave shape with an open top and has a drain outlet that communicates with the sewer. Wash water is supplied to the bowl portion 11.

[0010] The rim portion 12 is a portion formed within a predetermined height range from the upper surface along the upper edge of the bowl portion 11. The upper surface of the rim portion 12 is flat, and the inside is formed to be hollow.

[0011] As shown in Figure 2, the mounting surface 13 is formed on the rear wall of the upper part of the toilet body 10, which defines the boundary between the hollow part within the rim portion 12 and the outer surface of the toilet body 10. The mounting surface 13 is a flat surface onto which the rim nozzle 3, which will be described later, is attached, and has an insertion hole 13a through which the rim nozzle 3, which will be described later, is inserted. As shown in Figure 2, the mounting surface 13 is inclined, for example, with respect to the vertical direction P so that the downstream end of the rim nozzle 3 faces downward. As shown in Figure 4, the mounting surface 13 is inclined at an angle Q so that the upper end of the vertical direction of the mounting surface 13 is positioned closer to the front of the toilet body 10 than the lower end.

[0012] Chamber 14 is a space that can receive and retain a certain amount of flush water supplied to bowl portion 11. Chamber 14 is formed in a hollow portion inside rim portion 12, inside mounting surface 13. Chamber 14 forms part of flush water conduit 15, through which flush water is supplied and flows into bowl portion 11.

[0013] The water conduit 15 is formed inside the rim portion 12, and more specifically, is formed by the hollow portion of the rim portion 12. The water conduit 15 is a flow path for flush water that passes through the chamber 14 and communicates with the upper part of the inner surface of the bowl portion 11. The upstream side of the water conduit 15 is contained within the chamber 14, and extends from the downstream side of the chamber 14 along the edge of the rim portion 12. The water conduit 15 opens towards the bowl portion 11 at a position midway in the front-to-rear direction of the bowl portion 11. As shown in FIG. 2, the bottom surface 151 of the water channel 15 has an inclined surface that slopes downward on the upstream side.

[0014] The rim piping 2 has one upstream end, the upstream end 2a, connected to a water supply source for flush water that is supplied to the toilet body 10, and the other downstream end, the downstream end 2b, connected to the water conduit 15 of the toilet body 10, supplying flush water to the toilet body 10. The downstream end 2b of the rim piping 2 is connected to a rim nozzle 3, and the rim nozzle 3 is inserted into and fixed in an insertion hole 13a in the toilet body 10. The rim piping 2 is made of a resin material such as molded rubber, and has a gradient that slopes downward from the upstream side to the downstream side.

[0015] The rim piping 2 is a pipe having a hollow portion, and has a first portion 21, a second portion 22, and a third portion 23, as shown in FIGS. 3A and 3B. 3A to 3D are diagrams showing the rim piping 2. In Fig. 3A to 3D, the side on which the first portion 21 of the rim piping 2 described below is formed is described as the front. The front of the rim piping 2 is opposite to the front of the flush toilet 1 shown in Figs. 1, 2, and 4.

[0016] The first portion 21 is a generally cylindrical portion that extends in the vertical direction and is located upstream of the flush water when the rim piping 2 is connected. The first portion 21 is connected to the water supply pipe. The vertical dimension of the first portion 21 can be, for example, 12 mm or more.

[0017] The second portion 22 is a tubular portion that is longer than the first portion 21. The downstream end 2b of the second portion 22 is connected to the upstream end of the rim nozzle 3, which will be described later. As shown in FIG. 3B , the second portion 22 is a portion of the rim piping 2 that has a downwardly sloping gradient. A second imaginary line K2 connecting the centers of the width and height of the second portion 22 (if the second portion 22 is cylindrical, this is an imaginary line extending to the center of the diameter) slopes downward as it moves away from the first portion 21. That is, as shown in FIG. 3B , when the first imaginary line K1 at the center of the first portion 21 (if the first portion is not cylindrical, this is an imaginary line connecting the centers of the width and height) and the second imaginary line K2 of the second portion 22 are projected onto an imaginary plane cut by the side cross section of the rim piping 2, the angle R formed by the intersection of the lines projected onto the imaginary plane of the first imaginary line K1 and the second imaginary line K2 is not a right angle but an obtuse angle.

[0018] As shown in Figure 3A, the second portion 22 is bent or curved in plan view, and its widthwise center is offset from the first portion 21 in plan view and slopes downward. A second imaginary line K2 connecting the widthwise centers of the second portion 22 is not a straight line. The second imaginary line K2 extends a predetermined distance from the center of the first portion 21 to one widthwise side (the widthwise outer side of the toilet body 10 when installed in the flush toilet 1), and then bends to the other widthwise side (the widthwise inner side of the toilet body 10) and extends linearly in a direction away from the first portion 21. As shown in Figures 3A, 3C, and 3D, the widthwise center of the second portion 22 is offset from the widthwise center of the first portion 21 in plan view.

[0019] As shown in Figure 3B, the third portion 23 is disposed between the first portion 21 and the second portion 22, and is a corner portion connecting the first portion 21 and the second portion 22. The third portion 23 connects the first portion 21 and the second portion 22 so that the second imaginary line K2 and the first imaginary line K1 connecting the centers of the first portion 21 in the width direction and height direction do not intersect but are twisted. The third portion 23 twists from the downstream side of the first portion 21 toward the outside in the width direction of the toilet body 10 and is connected to the upstream side of the second portion 22.

[0020] Figure 4 is an enlarged partial cross section of the area around the rim nozzle 3. The rim nozzle 3 is a component that connects the rim piping 2 to the toilet body 10. The rim nozzle 3 is attached so that its tip slopes downward from the upstream side to the downstream side. The downstream end of the rim nozzle 3 is connected to the rear end of the rim section 12. In other words, the rim nozzle 3 is inserted through the insertion hole 13a in the attachment surface 13 and connected to the chamber 14 (see Figure 3(b)), and supplies flush water to the water conduit 15.

[0021] As shown in FIG. 4, the rim nozzle 3 has a nozzle body 30, a nut 4, an elastic member 5, a guide washer 6, a retaining metal fitting 7, a backup ring 8, and a nozzle cap 9.

[0022] The nozzle body 30 is a cylindrical adapter that is inserted into and fixed in place in the insertion hole 13a while connected to the rim piping 2. Cleansing water is supplied from the base end (upstream side of the cleansing water) of the nozzle body 30 and flows toward the tip end (downstream side of the cleansing water). The nozzle body 30 is formed with a larger diameter at the tip end than at the base end. The nozzle body 30 is made of resin. The entire nozzle body 30 is inclined downward so that water flows from the upstream side to the downstream side of the rim nozzle 3.

[0023] The nozzle body 30 has an outer surface formed with projections and recesses corresponding to the shape of the part with which the nozzle body 30 engages. Specifically, the nozzle body 30 has a screw groove 31, a protrusion 32, and a cap engagement projection 33.

[0024] The screw groove 31 is disposed on the upstream side of the nozzle body 30 and is configured to engage with a nut 4, which will be described later.

[0025] The protrusion 32 is disposed on the downstream side of the nozzle body 30, and is formed to protrude in an annular shape along the periphery of the nozzle body 30. The protrusion 32 is engaged with a retaining metal fitting 7, which will be described later.

[0026] The cap engagement protrusions 33 are arranged further downstream than the protrusions 32, and are protrusions formed facing one side and the other side on the outer surface of the nozzle body 30. The cap engagement protrusions 33 engage with the nozzle cap 9, which will be described later.

[0027] The elastic member 5 is a cylindrical rubber flat gasket with a flange formed thereon and having a hollow portion 54 at the center. The elastic member 5 has an insertion portion 51, an inner bead portion 52, and a contact portion 53. The nozzle body 30 is inserted into the hollow portion 54 of the elastic member 5.

[0028] The insertion portion 51 is a generally cylindrical portion that is inserted into the insertion hole 13a of the attachment surface 13, and extends along the insertion direction in which the nozzle body 30 is inserted.

[0029] The contact portion 53 is a flat annular portion that expands in diameter from the insertion portion 51 in a flange-like shape on one side of the insertion portion 51. As shown in FIG. 4, the contact portion 53 comes into contact with the mounting surface 13 of the toilet body 10 when the nozzle body 30 is inserted into the insertion hole 13a. The surface of the contact portion 53 that bends and expands in diameter from the insertion portion 51 is formed into a flat, planar shape, and comes into surface contact with the mounting surface 13. Because the mounting surface 13 is inclined downward, the contact portion 53 comes into contact with the mounting surface 13 at a downward incline with respect to the vertical direction P.

[0030] The inner bead portion 52 is a ring-shaped protrusion formed on the inner wall surface of the hollow portion 54 at the contact portion 53. The inner bead portion 52 has two rings spaced apart in the vertical direction that protrude inward from the inner wall surface of the hollow portion 54. The inner bead portion 52 presses against the outer surface of the nozzle body 30 when the nozzle body 30 is inserted into the hollow portion 54.

[0031] The guide washer 6 is disposed on the upstream side of the contact portion 53 of the elastic member 5. The guide washer 6 is made of resin and has a substantially annular shape.

[0032] The washer portion 61 is disposed on the surface of the elastic member 5 opposite to the side of the contact portion 53 that abuts against the mounting surface 13. The washer portion 61 is disposed overlapping the contact portion 53 so as to cover the contact portion 53. The washer portion 61 has an outer diameter that is approximately the same as or slightly larger than the contact portion 53.

[0033] The guide portion 62 is a side wall that protrudes from the periphery of the washer portion 61 and extends along the outer circumferential surface of the contact portion 53. The guide portion 62 extends in a direction substantially perpendicular to the surface of the washer portion 61 and is disposed so as to at least partially cover the side surface of the contact portion 53.

[0034] The retaining fitting 7 is a generally oval annular fitting with a through hole formed at its center, through which the nozzle body 30 is inserted. The retaining fitting 7 has an extending portion 71 that extends downstream of the insertion hole 13a in the mounting surface 13 and is able to abut against the surface surrounding the insertion hole 13a. When the nozzle body 30 is inserted into the through hole, the retaining fitting 7 abuts against a flange-shaped protrusion 32 formed on the downstream side of the nozzle body 30, and the extending portion 71 abuts against the downstream side of the surface surrounding the insertion hole 13a, thereby preventing the nozzle body 30 from slipping off toward the upstream side.

[0035] The backup ring 8 is an annular metal fitting with a through hole formed in the center, through which the nozzle body 30 is inserted. The backup ring 8 is thinner than the retaining metal fitting 7, and has a substantially circular outer shape. The backup ring 8 supports the elastic member 5 when the elastic member 5 is deformed.

[0036] The nut 4 is made of resin and has a nozzle body insertion hole 41 , a seat portion 42 , and a fastening portion 43 .

[0037] The nozzle body insertion hole 41 is a cylindrical through-hole through which the nozzle body 30 is inserted into the nut 4. A thread groove 41a on the nut 4 side is formed on the inner peripheral surface of the nozzle body insertion hole 41, which corresponds to the thread groove 31 formed on the outer peripheral surface on the upstream side of the nozzle body 30, and is engaged with the nozzle body 30 by rotating the nut 4.

[0038] The seat portion 42 has a flat surface that abuts against the upstream surface of the guide washer 6, and is formed in a substantially circular shape in a plan view.

[0039] The fastening portion 43 is a generally hexagonal columnar portion formed on the upstream surface of the seating portion 42. The fastening portion 43 stands upright from the seating portion 42 along the insertion direction of the nozzle body 30, and is fastened with a tool.

[0040] When the nut 4 is tightened, the guide washer 6, the elastic member 5, and the retaining metal fitting 7 sandwiched between the protrusion 32 of the nozzle body 30 and the toilet body 10 are pressed against the periphery of the insertion hole 13a in the toilet body 10. With the insertion part 51 inserted into the insertion hole 13a, the contact part 53 is pressed against the surface of the mounting surface 13 around the insertion hole 13a, fixing the rim nozzle 3 in place.

[0041] The nozzle cap 9 is a cap that can be attached and detached to the nozzle body 30, and has a cylindrical shape with one open end and one closed end. The nozzle cap 9 is attached so as to cover the downstream end of the nozzle body 30 and its surroundings. The nozzle cap 9 has a cap bottom portion 92 and a cap side portion 93. The nozzle cap 9 is made of resin.

[0042] The cap bottom 92 is a substantially circular surface against which the downstream end of the nozzle body 30 abuts, and has a plurality of through-holes 94 formed therein that spray flushing water toward the inside of the toilet body 10 . The cap side surface portion 93 is a substantially cylindrical portion that fits along the downstream side surface of the nozzle body 30. An engagement groove is formed on the opening side of the nozzle cap 9 in the cap side surface portion 93, and the nozzle cap 9 is attached to the nozzle body 30 by engaging with the cap engagement protrusion 33 arranged on the downstream side of the nozzle body 30.

[0043] According to the flush toilet 1 described above, the second section 22 of the rim piping 2 slopes downward from the upstream side to the downstream side. The rim nozzle 3 connected to the rim piping 2 is attached to a downwardly sloping mounting surface 13, and so similarly slopes downward. Furthermore, the chamber 14 in the rim section 12 to which the rim nozzle 3 is connected and the bottom surface 151 of the water conduit 15 slope downward. For this reason, flush water supplied from the upstream side continues to flow downstream of the water conduit 15 due to gravity, even after the supply is stopped.

[0044] According to this embodiment, the following effects are achieved. In this embodiment, the toilet is configured to include a toilet body 10 having a concave bowl portion 11 that is open at the top and through which flushing water is supplied, and a rim portion 12 that follows the upper edge of the bowl portion 11, and a rim piping 2 that has an upstream end 2a connected to a water supply source that supplies flushing water and a downstream end 2b connected to a flushing water conduit 15 formed in the rim portion 12, and that has a gradient that slopes downward from the upstream side to the downstream side. Because the rim piping 2 has a downward slope, residual water is less likely to accumulate in the rim piping 2 after the supply of flushing water is stopped after flushing water has circulated through the rim piping 2, and even if residual water remains, it is easy to drain from the rim piping 2. This prevents the residual water from being pushed out and splashing as droplets during the next flush, and prevents the growth of mold, bacteria, etc.

[0045] In this embodiment, the system further includes a rim nozzle 3 attached to the downstream side of the rim piping 2, and the rim nozzle 3 is inclined downward from the upstream side to the downstream side. As a result, after the supply of flush water stops, the flush water flowing from the rim piping 2 can be discharged from inside the rim nozzle 3 to the downstream side, making it less likely that residual water will accumulate. Therefore, the same effect as above is achieved.

[0046] In this embodiment, the toilet body 10 is formed with an insertion hole 13a through which the rim nozzle 3 passes, and is configured to include an inclined mounting surface 13. The rim nozzle 3 is configured to include an elastic member 5 having a contact portion 53 that comes into contact with the mounting surface 13 when the rim nozzle 3 is inserted into the insertion hole 13a. By tilting the mounting surface 13 of the rim nozzle 3 itself, gravity can be used to make it easier for the contact part 53 of the rim nozzle 3 to come into contact with the mounting surface 13. And by tilting the contact part 53, the entire rim nozzle 3 can be mounted with a reliable downward tilt. This makes it easier for residual water to drain from the upstream side to the downstream side, achieving the same effect as above.

[0047] In this embodiment, a water channel 15 is formed inside the rim portion 12, and the rim nozzle 3 is connected to the rim portion 12 to supply flushing water to the water channel 15. The bottom surface 151 of the water channel 15 is configured to include an inclined surface, at least a portion of which slopes downward. In the water conduit 15 in the rim section 12 to which the rim nozzle 3 is connected, the bottom surface 151 along which the flush water flows is inclined downward, so that the flush water supplied from the rim piping 2 flows along the bottom surface 151 downstream of the water conduit 15 and falls towards the bowl section 11. This makes it easier for residual water to drain from the upstream side to the downstream side, achieving the same effect as above.

[0048] In this embodiment, the rim piping 2 is configured to include a first portion 21 extending in the vertical direction upstream, a second portion 22 that bends from the first portion 21 and extends intersecting the direction in which the first portion 21 extends and has a slope, and a third portion 23 that is arranged between the first portion 21 and the second portion 22 and connects the first portion 21 and the second portion 22 so that a second imaginary line K2 connecting the centers of the width and height of the second portion 22 and a first imaginary line K1 connecting the centers of the width and height of the first portion 21 do not intersect but are twisted. By having second portion 22 have a downwardly sloping gradient, residual flush water supplied from the water supply source to which first portion 21 is connected is less likely to accumulate in second portion 22. By connecting the first and second parts so that the second imaginary line K2 of the second part 22 extending in the front-to-rear direction of the toilet body 10 and the first imaginary line K1 of the first part 21 extending in the up-down direction do not intersect but are twisted, the gradient (height difference) of the second part 22 is ensured, and the height dimension of the first part 21 and the size of the third part 23 required in the manufacturing process can be ensured. This makes manufacturing easier and ensures the flow rate required for the rim piping 2.

[0049] The above describes a preferred embodiment. The above embodiment is not limiting and can be modified as appropriate. For example, unlike the above embodiment, the toilet body 10 does not have to have a chamber 14 inside the rim portion 12 and a configuration in which flush water is supplied to the water conduit 15 under water pressure. For example, the toilet body may not have a chamber and only have a water conduit formed.

[0050] For example, unlike the above embodiment, the bottom surface 151 of the water conduit 15 does not have to be inclined only on the upstream side. As long as the water discharge performance is improved, the position of the inclination is not limited. It is sufficient that at least a portion is inclined, and the inclination may be continuous from the upstream end to the outlet that opens into the bowl portion 11 at the downstream end, or it may be inclined only on the downstream side.

[0051] Similarly, unlike the above embodiment, the rim piping 2 may have a downward slope in some areas, and may have some horizontal areas if this improves water discharge performance. The rim piping 2 does not need to be inclined entirely, and only the bottom portion where water flows may be inclined. [Explanation of symbols]

[0052] 1 flush toilet 2 Rim piping 3 Rim nozzle (nozzle) 5 Elastic member 10 Toilet bowl body 11 Bowl section 12 Rim section 13 Mounting surface 13a Insertion hole 15 Waterway 21 Part 1 22 Part 2 23 Part 3 53 Contact area 151 bottom K1 First virtual line K2 Second virtual line

Claims

1. a toilet body having a concave bowl portion that is open at the top and through which flushing water is supplied, and a rim portion along the upper edge of the bowl portion; a rim pipe having one end connected to a water supply source that supplies flushing water and the other end connected to a flushing water conduit formed in the rim portion, the rim pipe having a gradient that slopes downward from the upstream side to the downstream side; a nozzle attached to the downstream side of the rim pipe, The rim piping is a first portion extending in a vertical direction on the upstream side; a second portion that is a tubular portion longer than the first portion, bent from the first portion, extends crosswise to the extending direction of the first portion, and has the slope; The second portion extends a predetermined distance on the upstream side, and extends inward in the width direction of the toilet body in a plan view from a downstream end of the predetermined distance when the front-rear direction of the toilet body is used as a reference, The rim portion has the water channel formed therein, and the nozzle is connected to the rim portion to supply cleaning water to the water channel, A flush toilet, wherein the bottom surface of the water channel in front of the nozzle has a downwardly inclined surface.

2. The flush toilet according to claim 1, wherein the nozzle is inclined downward from the upstream side to the downstream side.

3. The toilet body has an insertion hole through which the nozzle is inserted and an inclined mounting surface, The flush toilet according to claim 2, wherein the nozzle has an elastic member having a contact portion that contacts the mounting surface when the nozzle is inserted through the insertion hole.

4. The flush toilet according to any one of claims 1 to 3, wherein the rim piping has a third portion that is disposed between the first portion and the second portion and connects the first portion and the second portion such that a second portion downstream imaginary line that connects the centers of the width and height directions on the downstream side of the second portion and a first imaginary line that connects the centers of the width and height directions of the first portion do not intersect but are twisted.

5. The flush toilet according to any one of claims 1 to 4, wherein the upstream side of the second portion extends outward in the width direction of the toilet body in a plan view.

6. The flush toilet according to any one of claims 1 to 5, wherein the second portion is formed so that its diameter is smaller on the downstream side than on the upstream side.

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