WO2017051593A1

WO2017051593A1 - Flush toilet

Info

Publication number: WO2017051593A1
Application number: PCT/JP2016/070688
Authority: WO
Inventors: 康宏近藤; 幸満稲毛
Original assignee: 株式会社Ｌｉｘｉｌ
Priority date: 2015-09-25
Filing date: 2016-07-13
Publication date: 2017-03-30
Also published as: CN108026721A; US20180282989A1; DE112016004353T5; JP2017061819A

Abstract

A flush toilet is provided with: a toilet bowl; a rim which forms the peripheral edge of the upper end opening of the toilet bowl; a first rim water discharge opening 34L formed in the inner peripheral wall of the rim; and a first rim water passage 36L formed on the outer peripheral side of the toilet bowl and supplying flush water to the first rim water discharge opening 34L. The first rim water passage 36L has a bend 42 which conducts flush water so that the flow direction of the flush water will be bent from one side in the circumferential direction of the toilet bowl to the other side, and a portion of a forward passage 44 interconnected with the bend 42 and a portion of a return passage 46 are arranged next to each other in the vertical direction.

Description

Flush toilet

The present invention relates to a flush toilet.

The flush toilet generally has a toilet bowl, a rim that forms the peripheral edge of the upper end opening of the toilet bowl, a rim spout formed on the inner peripheral wall of the rim, and an outer peripheral side of the toilet bowl. And a rim water passage for supplying cleaning water to the rim spout.

As this type of flush toilet, Patent Document 1 proposes a rim water passage provided with a folded portion for guiding washing water so as to be folded from one side to the other side in the circumferential direction of the toilet bowl. . In this flush toilet, it is said that it is not necessary to increase the strength of the washing water by discharging the washing water to a place where filth easily scatters, and water splashing outside the toilet bowl can be prevented.

JP 2011-208362 A

By the way, in the flush toilet of Patent Document 1, both the upstream side and the downstream side of the folded portion of the rim water passage are arranged side by side in the rim portion. As a result of investigation by the present inventor, it has been found that the conventional structure has room for improvement from the viewpoint of increasing the amount of washing water discharged from the rim spout while reducing the outer width of the rim portion.

The present invention has been made in view of such problems, and its purpose is to increase the amount of washing water discharged from the rim spout while reducing the outer width of the rim when the rim water passage is provided with a folded portion. It is in providing the flush toilet of the structure suitable for.

An embodiment of the present invention for solving the above problems is a flush toilet.
The flush toilet includes a toilet bowl, a rim that forms a peripheral edge of the upper end opening of the toilet bowl, a first rim spout formed on an inner peripheral wall of the rim, and a toilet bowl A first rim water passage formed on the outer peripheral side for supplying cleaning water to the first rim water spouting port, wherein the first rim water passage is from one side in the circumferential direction of the toilet bowl to the other. A return portion for guiding the washing water is provided so as to return to the side, and a part of the forward path portion and a part of the return path portion that are connected to the return portion are arranged vertically.

In order to make the structure suitable for increasing the discharge amount of the cleaning water from the first rim spout while reducing the outer width dimension of the rim, the cross-sectional area of the water channel at the place where the forward path part and the return path part are lined up and down Will be bigger. According to this aspect, compared with the case where the forward path part and the backward path part are arranged side by side, the increase in the size of the partition wall part that separates the forward path part and the backward path part is suppressed, while the forward path part and the backward path part are aligned. The cross-sectional area of the water channel can be effectively increased vertically. Therefore, it is possible to provide a structure suitable for increasing the discharge amount of the cleaning water from the first rim water spouting port while reducing the outer width dimension of the rim portion.

According to the present invention, in the case where a turn-up portion is provided in the first rim water passage, a structure suitable for increasing the amount of cleaning water discharged from the first rim water spouting port while reducing the outer width dimension of the rim portion is provided. it can.

It is a top view of the flush toilet concerning a 1st embodiment. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 3 is a sectional view taken along line BB in FIG. FIG. 4 is a sectional view taken along the line CC of FIG. 3. It is sectional drawing which expands and shows the left rim water passage which concerns on 1st Embodiment. FIG. 6 is a schematic diagram in which a cross section cut along a line DD in FIG. 5 is developed on a plane. It is sectional drawing which looked at the flush toilet concerning the reference example from the same viewpoint as FIG. It is side surface sectional drawing which shows the flush toilet concerning 2nd Embodiment. It is the schematic diagram which looked at the flush toilet which concerns on 2nd Embodiment from the same viewpoint as FIG.

Hereinafter, in the embodiment and the modification, the same reference numerals are given to the same components, and the duplicate description is omitted. Moreover, in each drawing, a part of component is abbreviate | omitted suitably for convenience of explanation.

FIG. 1 is a plan view of a flush toilet 10 according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
The flush toilet 10 includes a toilet body 12 made of ceramic. The toilet body 12 is a floor-standing toilet that is installed on the floor surface 100 of the toilet room.

As shown in FIG. 2, the toilet bowl body 12 includes a toilet bowl 14 and a drainage passage 16 connected to the bottom of the toilet bowl 14. The drainage passage portion 16 serves as a passage for filth discharged from the toilet bowl portion 14 to a sewage water channel (not shown). The drainage passage portion 16 includes a trap portion 20 in which a sealed water 18 for blocking the flow of air in the direction of water flow is stored. A connecting pipe (not shown) drawn from the floor surface 100 is connected to the downstream end of the trap part 20, and the trap part 20 is connected to the sewage side water channel via the connecting pipe.

3 is a cross-sectional view taken along line BB in FIG.
As shown in FIGS. 2 and 3, the toilet bowl portion 14 is formed at the bottom of the toilet bowl portion 14 while being recessed downward from the lower edge portion of the receiving surface portion 22 and the bowl-shaped receiving surface portion 22 for receiving filth. And a recess 24. The receiving surface portion 22 is formed in an elliptical shape whose front and rear dimensions are larger than the left and right dimensions in plan view. An inlet 16 a of the drainage passage 16 is opened at the bottom of the recess 24.

4 is a cross-sectional view taken along the line CC of FIG.
As shown in FIGS. 1, 2, and 4, the toilet bowl body 12 includes a rim portion 26 that forms a peripheral portion of the upper end opening 14 a of the toilet bowl portion 14. The rim portion 26 forms an upper end portion of the inner peripheral wall portion of the toilet bowl portion 14 and is connected to the upper edge portion of the receiving surface portion 22, and the left and right sides and front and rear sides of the flush toilet 10 from the upper end opening 14 a. And an upper wall portion 30 extending on both sides. The rim portion 26 includes an outer peripheral wall portion 32 that extends from the left and right sides of the upper wall portion 30 and the front outer peripheral end portion to the lower side and forms the upper end portion of the outer peripheral surface of the toilet body 12.

Returning to FIG. 3, the toilet body 12 includes a rim passage for supplying cleaning water to the two rim

water spouting ports

34L and 34R formed on the inner peripheral wall portion 28 of the rim portion 26 and the two rim

water spouting ports

34L and 34R.

Water channels

36L and 36R are provided. Further, the toilet body 12 is further formed on the inner peripheral side of the inner peripheral wall portion 28 of the rim portion 26 and the common water passage 38 for supplying washing water to each of the two

rim water passages

36L and 36R. Two

rim conduits

40A, 40B. Although the flush toilet 10 has one of the main features in the rim water passage 36L, the outline of the peripheral structure including the rim water passage 36L will be described first.

The two

rim spouts

34L, 34R include a left rim spout 34L (first rim spout) disposed on the left side of the flush toilet 10, and a right rim spout 34R disposed on the right side of the flush toilet 10. (Second rim spout). From each rim spout 34L, along the inner peripheral surface of the inner peripheral wall portion 28 of the rim portion 26, one side of the stool portion 14 in the circumferential direction (counterclockwise direction in FIG. 3; hereinafter, simply counterclockwise) Washing water is discharged in the direction).

The right rim spout 34R is disposed at the same height as the left rim spout 34L. Here, the “height position” refers to a position in the vertical direction with respect to the floor surface. In the present embodiment, all of the left rim spout 34L and all of the right rim spout 34R are arranged at the same height position, but a part of each

rim spout

34L, 34R is arranged at the same height position. Just do it. Moreover, each

rim spout

34L, 34R is arrange | positioned in the position which shifted the angle equivalent to 180 degrees around the center Cp (refer also FIG. 1) of the upper end opening 14a of the toilet bowl part 14 in planar view. Here, “equivalent” includes a case where both comparison targets are the same and a case where they are substantially the same.

The two

rim water passages

36L, 36R are provided with a left rim water passage 36L (first rim water passage) for supplying cleaning water to the left rim water outlet 34L and a water supply to the right rim water outlet 34R. Right rim water passage 36R (second rim water passage). Each rim water passage 36 L, 36 R is formed on the outer peripheral side of the toilet bowl 14. Specifically, it is formed on the outer peripheral side of the wall portion that forms the inner peripheral surface of the toilet bowl 14. Here, the “wall portion forming the inner peripheral surface of the toilet bowl portion 14” includes the receiving surface portion 22 of the toilet bowl portion 14 and the inner peripheral wall portion 28 of the rim portion 26.

The left rim water passage 36L is formed on the outer peripheral side and the left side of the inner peripheral wall portion of the left portion 14L among the left and

right portions

14L, 14R of the toilet bowl portion 14. Further, the left rim water passage 36 L is disposed on the front side with respect to the toilet bowl portion 14 so as not to pass through the left and right center line CL of the flush toilet 10. The right rim water passage 36 R is formed on the outer peripheral side and the right side of the inner peripheral wall portion of the right portion 14 R among the left and right portions 14 L and 14 R of the toilet bowl portion 14. Here, the left portion 14 L of the toilet bowl portion 14 refers to a portion that is disposed on the left side that is on the left and right side with respect to the left and right center line CL of the flush toilet 10. Further, the right portion 14 R of the toilet bowl portion 14 refers to a portion arranged on the right side with respect to the left / right center line CL of the flush toilet 10. The left-right center line CL is a straight line that bisects the left-right dimension Lx (see FIG. 1) that is the maximum of the outer surface portion of the flush toilet 10, and extends along the front-rear direction.

The

rim water passages

36L and 36R are formed by branching left and right from the downstream end portion of the common water passage 38. The branch position 36 a of each rim water passage 36 L, 36 R is disposed behind the inner peripheral wall portion 28 of the rim portion 26. Wash water is supplied to the common water passage 38 from a wash water supply device (not shown), and the wash water is introduced into the

rim water passages

36L and 36R in the direction Pa through the common water passage 38 (see also FIG. 2). . The washing water supply device is configured by, for example, a combination of a tank, a pump, and a water pipe.

The right rim water passage 36R is formed to extend in the counterclockwise direction from the branch position 36a serving as the upstream end, and the right rim water spouting port 34R is formed at the downstream end serving as the end position in the extending direction. Details of the left rim water passage 36L will be described later.

The two

rim water conduits

40A and 40B have a first rim water conduit 40A formed so as to extend counterclockwise from the left rim water outlet 34L, and a counterclockwise direction extending from the right rim water outlet 34R. And a second rim conduit 40B to be formed. Each of the

rim conduits

40A and 40B guides the cleaning water discharged from the respective rim spouts 34L and 34R to swivel so that the cleaning water can reach from the start position to the end position of the

rim conduits

40A and 40B. Is.

As shown in FIG. 4, the second rim conduit 40 B includes a shelf 40 a that extends from the upper edge of the receiving surface 22 toward the outside of the toilet bowl 14, and an overhang that is disposed above the shelf 40 a. And a hang part 40b. The shelf portion 40 a is formed such that the gradient of the upper surface portion connected to the upper edge of the receiving surface portion 22 is gentler than the gradient of the inner surface portion of the receiving surface portion 22. The overhang portion 40 b is formed such that a lower surface portion that vertically opposes the upper surface portion of the shelf portion 40 a extends toward the radially inner side of the toilet bowl portion 14. The first rim conduit 40A is the same although not shown.

Return to Fig. 3. The wash water discharged from each rim

water discharge port

34L, 34R forms a swirling flow that swirls in the toilet bowl portion 14 through the

rim conduits

40A, 40B. This swirling flow becomes a water flow for cleaning the inner surface of the toilet bowl portion 14, particularly the inner peripheral surface of the inner peripheral wall portion 28 of the rim portion 26 and the inner surface of the receiving surface portion 22.

Move on to the explanation of the left rim waterway 36L. FIG. 5 is an enlarged cross-sectional view of the left rim water passage 36L, and FIG. 6 is a schematic view in which a cross section cut along the line DD of FIG. In FIG. 6, the flow direction of the washing water in the left rim water passage 36 is indicated by an arrow Pb (the same applies to FIG. 2).

As shown in FIG. 5, the left rim water passage 36 L is arranged on the outer peripheral side of the left portion 14 L of the toilet bowl 14 from the branch position 36 a serving as the upstream end to the other side in the circumferential direction of the toilet bowl 14 (in FIG. 5. In the clockwise direction (hereinafter simply referred to as the clockwise direction). This range Sa refers to a range around the vertical axis passing through the center Cp (see also FIG. 1) of the upper end opening 14a of the toilet bowl 14. The left rim water passage 36L as a whole has a shape extending in the clockwise direction from the rear side of the flush toilet 10 toward the front side on the outer peripheral side and the left side of the toilet bowl portion 14.

As shown in FIGS. 5 and 6, the left rim water passage 36 L has a turn-back portion that guides cleaning water so as to turn back from the clockwise direction (left direction in FIG. 6) to the counterclockwise direction (right direction in FIG. 6). 42, a forward path portion 44 connected to the upstream side of the folded portion 42, and a return path portion 46 continued to the downstream side of the folded portion 42.

The forward path portion 44 is formed so as to extend in the clockwise direction from the branch position 36a of each of the

rim water passages

36L and 36R serving as the upstream end portion. The forward path portion 44 includes an upstream portion 44a provided on the upstream side, a downstream portion 44b provided on the downstream side, and an intermediate portion 44c connecting the upstream portion 44a and the downstream portion 44b.

The upstream portion 44a is disposed at a position away from the return path portion 46 in the counterclockwise direction (right direction in FIG. 6). The downstream portion 44 b is disposed below the return path portion 46. The lower surface of the upstream portion 44a is disposed at a higher position than the lower surface and the upper surface of the downstream portion 44b. The upstream portion 44a is disposed at a high position with respect to the downstream portion 44b. The lower surfaces of the upstream portion 44a and the downstream portion 44b are formed to be parallel to the horizontal plane. Here, “to be parallel” includes a case where both of the comparison targets are completely parallel and a case where they are substantially parallel.

The lower surface of the intermediate portion 44c is formed to be inclined with respect to the horizontal plane so as to smoothly connect the lower surface of the upstream portion 44a and the lower surface of the downstream portion 44b. The wash water flowing through the upstream portion 44a is guided downward when passing through the intermediate portion 44c and then flows through the downstream portion 44b. Thus, the intermediate portion 44c has a function of guiding the wash water from the upstream portion 44a to the downstream portion 44b.

The folding portion 42 connects the downstream end portion of the forward path portion 44 and the upstream end portion of the return path portion 46. The folded portion 42 has a shape in which the downstream portion 42b of the folded portion 42 is positioned on one of the upper and lower sides (upper side) with respect to the upstream portion 42a of the folded portion 42.

The return path part 46 is arranged on the upper side with respect to a part of the downstream part 44 b of the forward path part 44. A part of the downstream portion 44b of the forward path portion 44 and the return path portion 46 are arranged side by side. It can also be said that a part of the downstream portion 44b of the forward path portion 44 and the return path portion 46 are arranged so as to overlap vertically.

The return path portion 46 is formed so as to extend counterclockwise from the connection position with the folded-back portion 42 serving as the upstream end portion, and the left rim spout 34L is provided at the downstream end portion serving as the end position in the extending direction of the return path portion 46. Are provided in a row. A part of the first rim water conduit 40 A connected to the left rim water spouting port 34 L is also arranged vertically with a part of the downstream part 44 b of the forward path part 44.

FIG. 4 described above is also a cross-sectional view taken along the line EE of FIG.
As shown in FIGS. 4 to 6, a cavity 48 extending along the circumferential direction of the toilet bowl 14 is formed inside the rim portion 26 in the range Sa where the left rim water passage 36L is disposed. The In the cavity portion 48, a partition wall portion 54 that vertically divides the internal space 48a of the cavity portion 48 is disposed in a range Sb in which the downstream portion 44b of the forward path portion 44 is disposed. The partition wall 54 is formed so as to extend along the circumferential direction of the toilet bowl 14. The folded part 42, the forward path part 44, and the return path part 46 of the left rim water passage 36L are formed by disposing the partition wall part 54 in the internal space 48a of the cavity part 48. A part of the downstream portion 44 b of the forward path portion 44 and the return path portion 46 are formed by vertically dividing the internal space 48 a of the cavity portion 48 by the partition wall portion 54.

As shown in FIG. 6, when the cleaning water is introduced from the common water passage 38 into the left rim water passage 36 L, the washing water flows in the outward direction portion 44 in the clockwise direction (left direction in FIG. 6). When the cleaning water is introduced from the forward path portion 44 into the folding portion 42, the cleaning water flows in the folding portion 42 so that the flow direction is folded from the clockwise direction to the counterclockwise direction (right direction in FIG. 6). When washing water is introduced from the folded portion 42 into the return passage portion 46, the washing water flows in the counterclockwise direction in the return passage portion 46, and from the left rim spout 34L, the rear side of the flush toilet 10, In addition, the washing water is discharged in the counterclockwise direction.

The effect of the flush toilet 10 will be described. 7 is a cross-sectional view of the flush toilet according to the reference example as seen from the same viewpoint as FIG.
In FIG. 7, a part of the forward path portion 44 and the return path portion 46 are arranged side by side, and the internal space 48 a of the cavity portion 48 of the rim portion 26 is partitioned by the partition wall portion 54 to the left and right. 4 and 7, the outer width La of the rim portion 26 and the cross-sectional shape of the cavity 48 are the same.

The amount of washing water discharged from the left rim water outlet 34L is proportional to the water channel cross-sectional area at the portion where the water channel cross-sectional area is the smallest in the water passage from the upstream end of the left rim water passage 36L to the left rim water outlet 34L. It becomes. Here, in the place where the forward path portion 44 and the return path portion 46 are arranged, the cross-sectional area of the water channel is most likely to be small on the water passage of the left rim water passage 36L. Therefore, in order to obtain a structure suitable for increasing the discharge amount of the cleaning water from the left rim water spouting port 34L, it is preferable that the cross-sectional area of the water channel at the portion where the forward path portion 44 and the return path portion 46 are arranged can be increased. In order to reduce the outer width La of the rim portion 26 while satisfying this condition, the cross-sectional area of the water channel at the portion where the forward path portion 44 and the return path portion 46 are arranged is increased vertically.

Here, as shown in FIG. 7, when the forward path portion 44 and the return path portion 46 are arranged side by side, the forward path portion increases as the waterway cross-sectional area at the position where the forward path portion 44 and the return path portion 46 are aligned increases vertically. The dimension (particularly the vertical dimension) of the partition wall part 54 that separates 44 and the return path part 46 also increases. On the other hand, as shown in FIG. 4, when the forward path portion 44 and the return path portion 46 are arranged vertically, the cross-sectional area of the water channel at the location where the forward path portion 44 and the return path portion 46 are aligned increases vertically. However, the size of the partition wall 54 that separates the forward path portion 44 and the return path portion 46 does not increase. Accordingly, when the forward path portion 44 and the return path portion 46 are arranged side by side, compared to the case where the forward path portion 44 and the return path portion 46 are arranged side by side, an increase in the size of the partition wall portion 54 is suppressed, The cross-sectional area of the water channel at the place where the forward path part 44 and the return path part 46 are lined up can be effectively increased vertically. Therefore, it is possible to provide a structure suitable for increasing the discharge amount of the cleaning water from the left rim water spouting port 34L while reducing the outer width dimension La of the rim portion 26.

Further, in the example of FIG. 4, the width dimension Lb of the partition wall portion 54 is shorter than that of the example of FIG. 7, so that the cleaning water passing through the downstream portion 44 b of the forward path portion 44 and the cleaning water passing through the return path portion 46 The contact area is also reduced. When the contact area between the cleaning water and the partition wall portion 54 is reduced, the water pressure applied from the cleaning water to the partition wall portion 54 is also reduced accordingly. As a result, the thickness dimension Lc of the partition wall portion 54 required for securing the strength can be reduced, and by increasing the size of the internal space of the downstream portion 44b of the forward path portion 44 and the return path portion 46, the left rim spout 34L It is possible to make the structure suitable for increasing the discharge amount of the washing water from.

Further, since the return path portion 46 is disposed on the upper side with respect to a part of the downstream portion 44 b that is a part of the forward path portion 44, the return path portion 46 is disposed on the lower side with respect to a portion of the downstream portion 44 b of the forward path portion 44. The vertical dimension Ld (see FIGS. 2, 4, and 6) from the upper end opening 14a of the pot portion 14 to the left rim water spouting port 34L can be reduced. The vertical dimension Ld is also the vertical dimension of the overhang portion 40b. Originally, in the inner peripheral surface of the rim portion 26, the region between the upper end opening 14a of the stool portion 14 and the rim

water spouting ports

34L and 34R is difficult to reach the washing water, so that unwashed portions are easily generated. For this reason, if the inward path portion 46 is disposed below the outward path portion 44, the vertical dimension Ld of this area increases, and the range in which unwashed areas are likely to occur is widened as in the so-called box rim. . In this regard, according to the present embodiment, since the vertical dimension Ld of this region can be reduced, the range in which unwashed areas are likely to be generated can be reduced, and the inside of the toilet bowl portion 14 can be easily kept clean.

As shown in FIG. 3, the left rim water outlet 34L discharges the washing water to the rear side of the flush toilet 10, and the left rim water passage 36L that supplies the washing water to the left rim water outlet 34L It arrange | positions so that the left-right centerline CL of the flush toilet 10 may not be passed in the front side with respect to the bowl part 14. FIG. Therefore, in discharging the washing water in the same direction, the washing in the left rim water passage 36L is made rather than the layout of the left rim water passage 36L passing through the left and right center line CL on the front side with respect to the toilet bowl portion 14. The distance of the water passage is reduced. For this reason, there is also an advantage that it becomes easy to discharge the wash water having a strong water force from the left rim spout 34L, and it is easy to obtain a good toilet bowl cleaning ability.

Further, the toilet body 12 having the above left rim water passage 36L is obtained by casting. Specifically, as shown in FIGS. 4 to 6, the toilet body 12 includes the partition wall 54, the upper surface side portion 56 including the upper surface portion of the toilet body 12, and the toilet bowl located below the upper surface side portion 56. And a side portion 58. The boundary position between the upper surface side portion 56 and the toilet bowl side portion 58 is set to a position where the cavity 48 is vertically divided. The

portions

54, 56, and 58 are separately formed by casting, and the toilet body 12 is configured by joining them by bonding or the like.

Further, as shown in FIG. 1, the left rim water passage 36 L is disposed so as to pass through the rim portion 26 on the left side (one side in the left-right direction) with respect to the upper end opening 14 a of the toilet bowl portion 14 in a plan view. The Further, in the left rim water passage 36 L, in the plan view, the left-right dimension of the rim part 26 from the left outer surface portion of the rim part 26 to the upper end opening 14 a is ¼ or less of the left-right dimension Lx of the flush toilet 10. It arrange | positions so that it may pass in the rim | limb part 26 at a location. In the present embodiment, the front side (upper side in the drawing) from the location where the alternate long and short dash line Le crosses is the location where the left-right dimension of the rim portion 26 is 1/4 or less. Further, in the left rim water passage 36L according to the present embodiment, the left-right dimension of the rim portion 26 from the left outer surface portion of the rim portion 26 to the upper end opening 14a is 1 of the left-right dimension Lx of the flush toilet 10 in plan view. It arrange | positions so that it may pass in the rim | limb part 26 in the location used as / 6. In the present embodiment, the front side (upper side in the drawing) from the location where the alternate long and short dash line Lf crosses is the location where the left-right dimension of the rim portion 26 is 1/6 or less.

[Second Embodiment]
FIG. 8 is a side sectional view showing the flush toilet 10 according to the second embodiment, and FIG. 9 is a schematic view of the flush toilet 10 according to the second embodiment as seen from the same viewpoint as FIG.
The toilet body 12 includes a drainage passage 60 for discharging water in the left rim water passage 36L. 6 and 9, the direction of water flow in the drain passage 60 is indicated by an arrow Pc.

The drainage passage 60 communicates the left rim water passage 36L with the internal space of the trap portion 20. The drainage passage 60 includes a water introduction port 60a for introducing water from the left rim water passage 36L into the drainage passage 60, and a drainage port for discharging water from the drainage passage 60 into the trap portion 20. 60b. The water introduction port 60a opens on the lower surface of the downstream portion 44b of the left rim water passage 36L. The upper surface of the left rim water passage 36L is formed so as to be positioned above the water inlet 60a in a range Sa (see FIG. 5) from the upstream end of the left rim water passage 36L to the left rim water outlet 34L. The

Thus, after the supply of the cleaning water from the cleaning water supply device is completed, the water in the aforementioned range Sa including the downstream portion 44b of the left rim water passage 36L is discharged into the trap portion 20 through the water drainage passage 60. . Thereby, a space in which gas can flow is formed in the range from the upstream end of the left rim water passage 36L to the left rim water spouting port 34L during non-cleaning. The term “non-washing” as used herein refers to a time when the washing water is supplied from the washing water supply device into the toilet bowl 14 and in a standby state before the washing is started.

With the above configuration, after supplying the cleaning water from the cleaning water supply device, the intermediate portion in the range from the upstream end of the left rim water passage 36L to the left rim water spouting port 34L is completely submerged by the residual water. Can be prevented. For this reason, when the flush toilet 10 is used in a cold district or the like, the remaining water in the left rim water passage 36L is frozen, so that the wash water cannot be supplied to the left rim water outlet 34L through the left rim water passage 36L. The situation can be prevented and freezing measures can be taken.

In addition to this, after the supply of the cleaning water from the cleaning water supply device, the residual water in each of the

rim water passages

36L and 36R does not pass through the toilet bowl 14 but the drainage passage 60 through the drainage passage 60. Can be discharged. Therefore, it is possible to prevent residual water in the

rim water passages

36L and 36R from flowing into the rim

water spouting ports

34L and 34R over a long period of time as streak-like water (hereinafter referred to as streak-like water). The appearance can be prevented from being deteriorated by the water.

In the case of a layout in which the return path portion 46 of the left rim water passage 36L is disposed above the downstream portion 44b of the forward path portion 44, the water in the downstream portion 44b of the forward path portion 44 cannot be discharged from the left rim water spouting port 34L. . Even in such a layout, there is a great advantage in that it is possible to take measures against freezing by discharging water in a range including the inside of the downstream portion 44b of the forward path portion 44.

Further, in the example of FIG. 9, the example in which the drainage passage 60 for discharging the water in the left rim water passage 36L is formed separately from the

rim water passages

36L and 36R has been described. In addition to this, the drainage passage 60 may be configured by a right rim water passage 36R. The upper surface of the forward passage portion 44 and the right rim water passage 36R of the left rim water passage 36L is formed so as to be positioned above the lower surface of the forward passage portion 44 of the left rim water passage 36L and the right rim water passage 36R. Thereby, at the time of non-washing, the wash water in the range including the downstream portion 44b of the forward path portion 44 of the left rim water passage 36L is discharged from the right rim water outlet 34R through the right rim water passage 36R. As a result, a space in which gas can flow is formed in the range from the upstream end of the left rim water passage 36L to the left rim water spouting port 34L.

At this time, the intermediate portion 44b (see FIG. 6) of the forward passage portion 44 of the left rim water passage 36L is not inclined, and the lower surface of the upstream portion 44a and the downstream portion 44b of the forward passage portion 44 are formed so as to be continuous without a step. Also good. At this time, the right rim water spouting port 34R may be disposed at a height position below the left rim water spouting port 34L. This means that the right rim spout 34R is disposed at the same height as the downstream portion 44b of the forward path portion 44 of the left rim water passage 36L.

Although the present invention has been described based on the embodiments, the embodiments only show the principle and application of the present invention. In the embodiment, many modifications and arrangements can be made without departing from the spirit of the present invention defined in the claims.

The flush toilet 10 may wash the inside of the toilet bowl 14 by a washing method such as a wash-off type or a siphon type. The flush toilet 10 may use a water supply system such as a direct water supply system or a gravity water supply system using gravity. Although the toilet body 12 has been described by taking a floor-standing toilet as an example, it may be a wall-mounted toilet that is attached to a side wall surface of a toilet room. The toilet body 12 may be made of resin or the like in addition to pottery.

The flush toilet 10 may include left and right

rim water passages

36L and 36R as in the example of FIG. 3, or may include only one rim water passage. Moreover, although the example where one rim water outlet is formed per one rim water passage has been described, two or more rim water outlets may be formed per one rim water passage. In addition, the rim

water discharge ports

34L and 34R have been described as examples in which cleaning water is discharged toward one side in the circumferential direction along the inner peripheral surface of the rim portion 26. The rim spouts 34L and 34R may discharge the washing water into the toilet bowl 14, and may also discharge the washing water downward.

In the left rim water passage 36L, the example in which the return path portion 46 is disposed on the upper side with respect to a part of the downstream portion 44b of the forward path portion 44 has been described, but the return path portion 46 is disposed on the lower side with respect to a part of the forward path portion 44. May be. In addition, the left rim water passage 36L has been described as an example in which the entire return path 46 is arranged vertically with respect to a part of the forward path 44, but at least a part of the return path 46 is arranged vertically. Just do it.

The intermediate portion 44c of the forward path portion 44 has been described as an example in which only the lower surface is inclined with respect to the horizontal plane so as to smoothly connect the lower surface of the upstream portion 44a and the lower surface of the downstream portion 44b. In addition, the upper surface of the intermediate portion 44c may be formed to be inclined with respect to the horizontal plane so as to smoothly connect the upper surface of the upstream portion 44a and the upper surface of the downstream portion 44b.

The drain outlet 60b of the drainage passage 60 discharges washing water into the recess 24 of the toilet bowl 14 and the sealing water 18 in the drain passage 16 at the time of toilet bowl cleaning, thereby providing a water flow for promoting discharge of filth. It may be used as a jet discharge port to be formed. In this case, for example, the drain port 60 b is formed at a position where the wash water can be discharged toward the downstream side of the drain passage portion 16.

Generalizing the invention embodied by the above embodiments and modifications leads to the following technical idea.

In the flush toilet according to the aspect described in the means for solving the above-described problem, the return path portion may be disposed on the upper side with respect to a part of the forward path portion.
According to this aspect, the upper and lower dimensions of the region from the upper end opening of the toilet bowl to the rim spout on the inner peripheral surface of the rim part, rather than the return path part being disposed below the part of the forward path part Can be reduced. Therefore, it is possible to reduce the range in which the unwashed residue is easily generated, and to easily keep the toilet bowl portion clean.

The flush toilet of the above-described aspect may include a drainage passage for discharging water in a part of the forward path portion.
According to this aspect, it is possible to prevent a part of the forward path portion disposed below the return path portion from being completely submerged by the residual water. Therefore, when a flush toilet is used in cold districts, etc., it is possible to prevent the situation that the wash water cannot be supplied to the rim spout through the rim water passage by freezing the residual water in the rim water passage, and measures against freezing can be taken. Can be planned.

The flush toilet of the above-described aspect may be arranged such that the first rim water passage passes through one side in the left-right direction with respect to the upper end opening in a plan view.

The flush toilet of the above-described aspect includes a second rim spout formed on the inner peripheral wall portion of the rim portion, and the second rim spout is at the same height as the first rim spout, or You may arrange | position in the height position below the said 1st rim spout.

DESCRIPTION OF SYMBOLS 10 ... Flush toilet bowl, 14 ... Toilet bowl part, 14a ... Upper end opening, 26 ... Rim part, 28 ... Inner peripheral wall part, 34L ... Left rim water outlet (first rim water outlet), 36L ... Left rim water passage (first 1 rim water passage), 42 ... turn-up part, 44 ... forward path part, 46 ... return path part, 52 ... peripheral wall part, 60 ... drainage passage.

The present invention relates to a flush toilet.

Claims

Toilet bowl,
A rim that forms a peripheral edge of the upper end opening of the toilet bowl,
A first rim spout formed on the inner peripheral wall of the rim;
A first rim water passage formed on the outer peripheral side of the toilet bowl portion for supplying wash water to the first rim spout,
The first rim water passage has a turn-back portion that guides washing water so as to turn back from one side in the circumferential direction of the stool portion to the other side, and a part of the forward path portion and a part of the return path portion that are connected to the turn-up portion And a flush toilet characterized by being arranged side by side.
The flush toilet according to claim 1, wherein the return path portion is disposed above a part of the forward path portion.
The flush toilet according to claim 2, further comprising a drainage passage for discharging water in a part of the forward path.
The flush toilet according to any one of claims 1 to 3, wherein the first rim water passage is disposed so as to pass through one side in a left-right direction with respect to the upper end opening in a plan view.
A second rim spout formed on the inner peripheral wall of the rim,
The flush toilet according to any one of claims 1 to 4, wherein the second rim water spouting port is disposed at the same height as the first rim water spouting port.