JP7134405B2 - flush toilet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flush toilet, and more particularly to a flush toilet that is flushed with flush water supplied from a flush water source to discharge waste.

2. Description of the Related Art Conventionally, a first rim spout and a second rim spout are conventionally used as a conventional flush toilet that is flushed with flush water supplied from a flush water source to discharge waste, as described in Patent Document 1, for example. A flush toilet with two rim spouts is known.
In such a conventional flush toilet bowl, the first rim spout is arranged on the rim wall surface on the left side of the bowl portion when viewed from the front of the toilet body, and behind the front end of the pot portion for storing pooled water. ing. As a result, a large amount of cleansing water is spouted forward from the first rim spout as the first rim spout to form a swirling flow within the bowl portion.
On the other hand, the second rim spout of the above-described conventional flush toilet is arranged on the right rear rim wall surface of the bowl portion of the toilet body and behind the rear end of the pot portion. As a result, a small amount of cleansing water is spouted from the second rim spout in the same direction as the swirling flow of the first rim spout from the first rim spout as the second rim spout.
With these two rim spouts, washing water can be supplied around the entire circumference of the bowl to wash the entire bowl.

JP 2017-166315 A

However, in the bowl portion of the conventional flush toilet described in Patent Document 1 mentioned above, there are regions where dirt easily adheres and regions where dirt does not easily adhere.
Specifically, the region where dirt is likely to adhere is the rear region of the bowl portion on the rear side of the pot portion for storing pooled water. It is preferable to supply a large flow rate of washing water at .
However, in the above-mentioned flush toilet bowl of Patent Document 1, since the first rim spout is arranged on the rim wall surface on the left side of the bowl portion and behind the front end of the pot portion, The swirling flow of the spouted first rim spout water passes through the front side in the bowl portion and swirls rearward, and most of the first rim spout water falls into the pot portion by the time it reaches the rear region of the bowl portion. put away.
Therefore, the first rim spout that has reached the rear region of the bowl portion is supplied to the rear region of the bowl portion with a small flow rate and a reduced flow velocity.
Furthermore, in the flush toilet of Patent Document 1 described above, the second rim spout discharged from the second rim spout is spouted in a swirling manner in the same direction as the swirling flow of the first rim spout. Even if the water from the first rim reaches the rear area and merges with the water from the second rim in the rear area of the bowl, it is difficult for the water to fall into the urn and the washing performance of the rear area of the bowl, where dirt easily adheres, is insufficient. There is a problem of becoming
Therefore, an important issue is how to improve the detergency by supplying a sufficient amount of wash water to the rear area of the bowl where dirt tends to adhere.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-described problems of the prior art, and is capable of efficiently supplying washing water at a high speed and a large flow rate to the rear region of the bowl portion where dirt tends to adhere. To provide a flush toilet capable of improving the washing power over a wide range in the rear area of a bowl part.

In order to solve the above-described problems, the present invention provides a flush toilet that is flushed with flush water supplied from a flush water source to discharge waste, comprising a bowl-shaped waste receiving surface and an upper portion of the waste receiving surface. a bowl portion provided below the waste-receiving surface for storing pooled water and forming a seal water; and a first rim portion provided on the rim portion on one side in the left-right direction of the bowl portion to perform a first rim water spout for spouting cleansing water forward and swirling along the rim portion. A first rim water spouting portion that forms a flow, and a second rim water spouting portion that is provided on the rim portion on the other side of the bowl portion in the left-right direction and spouts cleansing water at a flow rate smaller than that of the first rim water spouting portion. a second rim water spouting portion, the first rim water spouting portion having a first rim water spout disposed forward of the front end of the pot portion, and the second rim water spouting portion The second rim spout crosses the swirl direction of the swirl flow of the first rim spout, and the wash water, which interferes with the swirl flow of the first rim spout, flows into the bowl portion on the rear side of the pot portion. A second rim spout configured to lead to a rear region is provided, the second rim spout spreading the second rim spout in a film that is wider than the swirling flow of the first rim spout. It is characterized by having a diffusion part.
In the present invention configured as described above, since the first rim spout of the first rim spout is disposed in front of the front end of the pot portion of the bowl portion, the first rim spout is spouted at high speed and with a large flow rate. The swirling flow can be efficiently guided to the rear region of the bowl portion (the dirt receiving surface and rim portion on the rear side of the pot portion).
Further, the second rim spouting port of the second rim spouting portion traverses the swirling direction of the swirling flow of the first rim spouting water spouted from the first rim spouting port of the first rim spouting portion. Since the water can be spouted, the swirl flow of the first rim spout water having a high speed and a large flow rate can be merged with the water flow of the second rim spout water to efficiently interfere with it.
As a result, the more the first rim spout of the first rim spout portion is located forward of the front end of the pot portion of the bowl portion, the more the swirling flow of the first rim spout occurs in the rear region of the bowl portion at a higher speed and a larger flow rate. It is possible to prevent the swirling flow of the first rim water discharge after interfering with the second rim water discharge from falling in the rear area of the bowl portion even if the water is guided in this state.
Therefore, it is possible to improve the detergency of the first rim spout and the second rim spout for washing the contaminant receiving surface and the rim portion in the area behind the pot portion of the bowl portion.
Furthermore, the diffusing portion of the second rim spout can radially diffuse the second rim spout discharged from the second rim spout, making the second rim spout wider than the swirling flow of the first rim spout. can be made into a film. As a result, the swirling flow of the first rim spouting water with high speed and large flow rate and the wide film-like flow of the second rim spouting water can be guided to the rear area of the bowl portion while causing interference.
Therefore, it is possible to efficiently supply the first rim spouting water at a high speed and a large flow rate to the rear region of the bowl portion, where dirt tends to adhere, while interfering with the second rim spouting water. It is possible to improve the detergency of a wide range of.

In the present invention, preferably, the diffusing portion is configured to guide the second rim spouting water spouted from the second rim spouting port so as to traverse the rear region of the bowl portion in the left-right direction.
In the present invention configured as described above, the diffusion portion of the second rim water spout allows the wide and film-like second rim water spouted from the second rim spout to be spouted from the first rim spout at high speed and at a large flow rate. While interfering with the swirling flow of the second rim, it can be guided to traverse the rear region of the bowl in the left-right direction. Thus, the entire rear region of the bowl can be extensively cleaned.

In the present invention, preferably, the diffusion section causes at least part of the second rim spout spouted from the second rim spout to traverse the rear region of the bowl section in the left-right direction, and then spreads the bowl section. It is configured to be able to turn toward the first rim spout along the wall surface of the rim portion in the rear region.
In the present invention configured as described above, the diffusion portion of the second rim spout guides the second rim spout discharged from the second rim spout to the rear area of the bowl portion together with the swirling flow of the first rim spout. As a result, the rear region of the bowl portion, to which contaminants tend to adhere, can be reliably cleaned.
In addition, at least part of the second rim spout may traverse the rear region of the bowl portion in the left-right direction, and then turn along the wall surface of the rim portion in the rear region of the bowl portion toward the first rim spout. Therefore, it is possible to ensure cleansability also in the region from the rear region of the bowl portion to at least the first rim spout in front of the front end of the pot portion.
Therefore, by effectively utilizing the first rim water discharge and the second rim water discharge, it is possible to improve the detergency of the rear region of the bowl portion, and also to the region from the rear region of the bowl portion to the front region where dirt tends to remain. can be sufficiently washed, it is possible to ensure washability over the entire bowl portion.

In the present invention, preferably, the diffusion portion is provided so that the direction of the channel center axis is at an angle with respect to the tangential plane of the rim wall surface in the vicinity of the rear end of the second rim spout in the rim portion. ing.
In the present invention configured as described above, the direction of the channel center axis of the diffusion portion of the second rim spout is at an angle to the tangential plane of the rim wall surface near the rear end of the second rim spout in the rim portion. Therefore, the second rim spout can be spouted from the second rim spout toward the rear area of the obliquely rearward bowl portion.
Further, the discharged second rim water can be diffused radially so as to effectively cross the swirling direction of the swirling flow of the first rim water, forming a wide film-like water flow. .
Furthermore, it is possible to suppress a phenomenon (so-called Coanda phenomenon) in which the second rim water spout is attracted to the rim wall surface in the vicinity of the second rim water outlet in the rim portion. Therefore, the second rim spout flows in the same swirling direction together with the swirling flow of the first rim spout, and in the rear region of the bowl portion, all of the combined cleansing water simply swirls without dropping. It can be suppressed.
As a result, the swirling flow of high-speed, high-flow water from the first rim and the wide, film-like water from the second rim, which is discharged obliquely backward, merge and moderately interfere with each other, while the lateral direction of the rear region of the bowl portion. and can be effectively guided over the entire front-rear direction.

In the present invention, preferably, the apparatus further includes a second rim conduit for guiding wash water supplied from the wash water source to the second rim water discharge section,
The second rim water conduit consists of a first curved water conduit that changes the direction of wash water flowing forward from the upstream side to the rear, and a second curved water conduit that is provided downstream and rearward of the first curved water conduit. and a water channel, wherein the second curved water channel has a curved portion that changes the direction of the wash water flowing rearward by the first curved water channel obliquely rearward, and is located downstream of the curved portion. The diffusion section is provided.
In the present invention configured as described above, the wash water supplied from the wash water source to the second rim water conduit flows forward from its upstream side and flows rearward through the first curved water conduit. Thereafter, the wash water that has passed through the first curved water channel is redirected obliquely rearward at the curved portion of the second curved water channel, and then passes through the diffusion portion of the second rim spout.
At this time, the flow velocity of the wash water can be reduced when the direction of the wash water flowing backward from the first bent water passage to the second bent water passage is changed obliquely rearward at the bent portion of the second bent water passage. . As a result, when the second rim water is spouted from the second rim water spout after passing through the diffusion portion of the second rim water spout, the second rim water is radiated obliquely rearward from the second rim water spout. Since it becomes easy to diffuse, it is possible to form a wide and film-like second rim spout.
As a result, the film-like second rim water discharge, which is wider than the first rim water discharge, can be made to cross the swirling direction of the swirling flow of the first rim water discharge at a high speed and with a large flow rate. It is possible to effectively interfere with the first rim spout.
In addition, it is possible to effectively suppress the phenomenon that the second rim water spouted from the second rim water outlet is attracted to the rim wall surface in the vicinity of the second rim water outlet in the rim portion (so-called Coanda phenomenon). . Therefore, the second rim spout flows in the same swirling direction together with the swirling flow of the first rim spout, and in the rear region of the bowl portion, all of the combined cleansing water simply swirls without dropping. It is possible to effectively suppress sagging.

In the present invention, preferably, the diffusion section is a downstream water conduit formed downstream of the bent part of the second curved water conduit, and the width of the downstream water conduit is equal to the width of the second curved water conduit. It is set larger than the width of the water channel on the upstream side of the bent portion of the water channel.
In the present invention configured as described above, the diffusion portion is the downstream water conduit formed downstream of the bent portion of the second curved water conduit, and the width of this downstream water conduit is the width of the second curved water conduit. It can be set wider than the width of the water conduit on the upstream side of the bend in the water conduit.
As a result, the wash water that has flowed backward from the first curved waterway to the second curved waterway is redirected obliquely rearward at the curved portion of the second curved waterway, and then guided downstream of the second curved waterway. By passing through the water channel, the second rim spouting water that is spouted obliquely rearward from the second rim spouting port can be effectively diffused radially to form a wide film.
As a result, the swirl flow of the high-speed, high-flow first rim spouting water and the wide, film-like water flow of the second rim spouting water spouted obliquely rearward are merged and moderately interfered with each other. It can be guided more effectively in the left-right direction and the front-rear direction.

According to the flush toilet bowl of the present invention, it is possible to efficiently supply a large flow rate of flushing water at high speed to the rear area of the bowl where dirt is likely to adhere, thereby providing a wide range of detergency in the rear area of the bowl. can be improved.

1 is a schematic plan view of a flush toilet according to one embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; FIG. 2 is a cross-sectional view taken along line III-III of FIG. 1; FIG. 2 is a cross-sectional view taken along line IV-IV of FIG. 1; 2 is a partially enlarged plan view enlarging a portion of a bowl portion including a second rim water conduit and a second rim spout in the toilet body of the flush toilet shown in FIG. 1 according to the embodiment of the present invention; FIG. FIG. 4 is a partially enlarged view of a second rim spout in the toilet body of the flush toilet according to the embodiment of the present invention shown in FIG. 3; FIG. 3 is a schematic plan view schematically illustrating the flow of flush water in the bowl portion of the flush toilet according to one embodiment of the present invention, before the swirling flow of the first rim spout joins the flow of the second rim spout. . FIG. 4 is a schematic plan view schematically illustrating the flow of flush water after the swirling flow of the first rim spout joins the second rim spout in the bowl portion of the flush toilet according to the embodiment of the present invention; .

Next, a flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7B.
First, FIG. 1 is a schematic plan view of a flush toilet according to one embodiment of the present invention.
As shown in FIG. 1, a flush toilet 1 according to one embodiment of the present invention includes a toilet body 2 made of ceramics. The toilet body 2 includes a water conduit 4, a bowl-shaped bowl portion 6, and a drain trap conduit 8 from the upstream side to the downstream side.
Note that the toilet body 2 may be made of resin other than ceramics.

Next, a toilet seat (not shown) and a toilet lid (not shown) are provided on the upper surface of the toilet body 2 of the flush toilet 1 of the present embodiment shown in FIG. Since the structure is the same as that of the toilet bowl, a detailed description is omitted.
On the upper surface of the toilet bowl body 2, a sanitary washing unit (not shown) for washing the user's private parts and a toilet bowl body 2 are provided behind the toilet seat (not shown) and the toilet lid (not shown). A functional unit (not shown) such as a water supply system functional unit that is involved in the water supply function may also be provided. are omitted.

Next, as shown in FIG. 1, the flush toilet 1 according to one embodiment of the present invention is a gravity water supply type water storage that is a flush water source for storing flush water used for flushing the toilet bowl and supplying it to the toilet bowl main body 2 . It is a so-called "wash-off type flush toilet" which is provided with a tank 10 and flushes away wastes by the action of running water caused by the drop of water in the bowl portion 6 of the toilet body 2.例文帳に追加
In this embodiment, the flushing water source that supplies flushing water to the toilet body 2 is not limited to a tank-type configuration such as the gravity-fed water storage tank 10 described above, and other configurations are also applicable. . That is, the flushing water source that supplies flushing water to the toilet body 2 may be of a tap water direct pressure type or a flush valve type that directly utilizes the water supply pressure of tap water, or may utilize pump compensation pressure. It may be in the form of supplying the washing water.

Next, FIG. 2 is a sectional view along line II-II of FIG. 3 is a cross-sectional view taken along line III-III in FIG. Furthermore, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.
In the flush toilet bowl 1 of the present embodiment shown in FIGS. 2 to 4, the outer shape of the toilet body 2 and the water storage tank 10 are omitted. Only major parts of the toilet body 2, such as the water channel 4 and the drain trap line 8, are shown.

Here, in the flush toilet 1 according to the embodiment of the present invention shown in FIG. An extending center axis is indicated by "X", and a center axis extending in the horizontal front-rear direction so as to bisect the bowl portion 6 in the left-right direction is indicated by "Y".
In FIG. 1, the intersection of the central axes X and Y is defined as the center O of the bowl portion 6 in plan view, and the central axis extending vertically through the center O is indicated by "Z".
As a result, in the flush toilet 1 according to the embodiment of the present invention shown in FIGS. 2 and 3, when viewed from the side of the bowl portion 6 of the toilet body 2, the bowl portion 6 is vertically divided into two halves in the front-rear direction. A central axis extending in a direction is indicated by "Z".
Further, as shown in FIGS. 1 to 3, the front, rear, left, and right directions of the flush toilet 1 are indicated by "front,""rear,""left," and "right," respectively.

Next, as shown in FIGS. 1 to 4, the water conduit 4 located on the upstream side of the toilet body 2 is formed on the rear side of the bowl portion 6, and flushes water supplied from the water storage tank 10 to the bowl portion 6. It is designed to lead to
As shown in FIGS. 1 to 4, the bowl portion 6 located on the downstream side of the water conduit 4 of the toilet body 2 includes, from the bottom to the top, a pot portion 12, a waste receiving surface 14, a shelf portion 16, and a rim portion 18 .

First, as shown in FIGS. 1 to 4, the urn portion 12 of the bowl portion 6 is provided below the bowl portion 6, stores pooled water W0 therein, and seals the water (sealing surface WL). forming.
As shown in FIGS. 1 to 4, the pot portion 12 includes a bottom wall 12a, side walls (left side wall 12b and right side wall 12c) provided on the left and right sides of the bottom wall 12a, and the bottom wall 12a. and a rear wall 12d provided at the rear.
Furthermore, as shown in FIG. 1, the front sides of the side walls 12b and 12c on both sides of the pot portion 12 have a tapered shape that approaches each other from the rear toward the front in plan view. is the tip portion T.

Here, as shown in FIGS. 1 to 3, in the flush toilet bowl 1 of the present embodiment, the region inside the bowl portion 6 is located at the upper edge of both side walls 12b and 12c of the pot portion 12 and the front end position P1 (tip end). A region on the front side of the portion T) is defined as a “front region F of the bowl portion 6”. Further, in the front region F of the bowl portion 6, a left region L and a right region R with respect to the center axis Y in the horizontal front-rear direction of the bowl portion 6 are referred to as a “left front region LF of the bowl portion 6” and a “bow portion”, respectively. 6 right front region RF”.
Similarly, the region behind the upper edge of the pot portion 12 and the rear end position P2 is defined as "the rear region B of the bowl portion 6". Further, in the rear region B of the bowl portion 6, a left region L and a right region R with respect to the center axis Y in the horizontal front-rear direction of the bowl portion 6 are referred to as a “left rear region LB of the bowl portion 6” and a “bowl portion”, respectively. 6 right rear region RB”.
Next, as shown in FIGS. 1 to 3, in the flush toilet bowl 1 of the present embodiment, the space between the front region F and the rear region B in the bowl portion 6 is defined as "the middle region M of the bowl portion 6." Define. In the intermediate region M of the bowl portion 6, the region on the left side of the upper edge of the left side wall 12b of the pot portion 12 is defined as the "left side region LM of the bowl portion 6". The area on the right side of the upper edge is defined as "the right side area RM of the bowl portion 6".

Next, as shown in FIGS. 1 to 4, the waste receiving surface 14 of the bowl portion 6 extends from the lower edge connected to the upper edge of the pot portion 12 to the shelf surface 16a of the shelf portion 16 and the rim portion of the rim portion 18. Together with the wall surface 18a, it forms a bowl-shaped bowl surface, which serves as a surface for receiving dirt.
1 to 4, the boundary line between the pot portion 12 and the waste receiving surface 14 (the upper edge of the pot portion 12 and the lower edge of the waste receiving surface 14) is "L1".
The rim portion 18 of the bowl portion 6 forms the upper edge of the bowl portion 6, and the inner peripheral surface of the rim portion 18 (rim inner wall surface 18a) is generally oval in plan view shown in FIG. formed into a shape.
Further, the ledge 16 of the bowl portion 6 is formed between the outer edge of the dirt receiving surface 14 and the lower end of the rim portion 18 . The wash water in the water conduit 4 is guided to each of two rim spouts (first rim spout 20 and second rim spout 22), details of which will be described later. Accordingly, the first rim water discharge and the second rim water discharge are discharged from the first rim water discharge port 20 and the second rim water discharge port 22, respectively.
In addition, in the present invention, it is not always necessary to provide the shelf portion 16, and the first rim water discharge and the second rim water discharge from the first rim water discharge port 20 and the second rim water discharge port 22, respectively, are applied to the waste receiving surface 14. Water may be jetted to the upper edge.

Next, as shown in FIGS. 1 to 4, the water conduit 4 includes a common water conduit 24, a first rim water conduit 26, and a second rim water conduit .
First, the common conduit 24 is formed inside the toilet bowl body 2 on the rear side of the bowl portion 6 so as to extend from the rear inlet 4a connected to the water storage tank 10 to the vicinity of the back side of the bowl portion 6 on the front side. .

Next, as shown in FIGS. 1, 2 and 4, the first rim spout 20 is provided in the rim portion 18 in the left front region LF in the bowl portion 6, and is located at the front end position P1 of the pot portion 12. placed anteriorly.
1, 2 and 4, the first rim water conduit 26 branches from the common water conduit 24 near the back side of the bowl portion 6 to the left side of the bowl portion 6, and then It is formed inside the rim portion 18 so as to extend to the front first rim spout 20 while bypassing the outer peripheral surface.
As a result, the wash water supplied from the common water conduit 24 to the first rim water conduit 26 is discharged from the first rim water outlet 20 to the front shelf 16 as the first rim water. A swirling flow is formed that swirls from the left front area LF to the right side area RM via the right front area RF.

On the other hand, as shown in FIGS. 1, 3 and 4, the second rim spout 22 is provided in the rim portion 18 of the right side region RM in the bowl portion 6, and are arranged rearward and forward of the rear end position P2.
In addition, the second rim spout 22 is arranged rearward of the center of the pot portion 12 in the front-rear direction (the center O1 of the pot portion 12 in the front-rear direction shown in FIG. 1).
Further, as shown in FIGS. 1, 2 and 4, the second rim water conduit 28 branches from the common water conduit 24 to the right side of the bowl portion 6 in the vicinity of the back side of the bowl portion 6, although the details will be described later. After that, it is formed so as to bypass the outer peripheral surface of the bowl portion 6 and extend to the rim portion 18 of the right side region RM of the bowl portion 6 in front.
After that, inside the rim portion 18 of the right side region RM of the bowl portion 6 , the second rim water conduit 28 extends rearward by making a U-turn to the rear side, and then diagonally rearward toward the second rim spout 22 . is formed to extend to the second rim spout 22.

Next, as shown in FIGS. 1 to 4, the drain trap duct 8 located downstream of the toilet bowl body 2 is formed rearward from below the bowl portion 6, and serves as a drain for discharging waste in the bowl portion 6. It is a channel (drainage trap part).
An inlet 8a of the drain trap pipe 8 is connected to a drain port h below the pot portion 12 (bottom wall 12a) of the bowl portion 6. As shown in FIG. The drain trap pipeline 8 has a descending path 8b that descends downward and rearward from its inlet 8a, and an ascending path 8c that rises upward and rearward from the downstream end of this descending path 8b.

Next, details of the second rim water conduit 28 and the second rim spout 22 in the flush toilet 1 of the present embodiment will be described with reference to FIGS. 1 and 3 to 6. FIG.
First, FIG. 5 is a partially enlarged plan view enlarging the bowl portion including the second rim water conduit and the second rim spout in the toilet body of the flush toilet according to the embodiment of the present invention shown in FIG. . FIG. 6 is a partially enlarged view of the second rim spout portion of the toilet body of the flush toilet according to the embodiment of the present invention shown in FIG.
As shown in FIG. 5, the second rim water conduit 28 includes an outer water conduit 30, a first curved water conduit 32, and a second curved water conduit 34 from its inlet 28a toward the downstream side. there is

As shown in FIG. 5 , the outer water conduit 30 of the second rim water conduit 28 has an inlet 28a connected to the common water conduit 24 on the rear side (upstream side), bypasses the outer peripheral surface of the bowl portion 6, and flows forward. is formed within the rim portion 18 of the right side region RM of the bowl portion 6 of the .
Next, as shown in FIG. 5, the first bent water conduit 32 of the second rim water conduit 28 extends forward from the front end (downstream end) E1 of the outer water conduit 30 and then bends rearward at the bend B1. It is formed so as to bend toward. That is, the bent portion B1 of the first bent water conduit 32 is a portion that turns into a U shape in plan view in FIG. As a result, the wash water that has flowed forward from the outer water conduit 30 on the upstream side into the first curved water conduit 32 passes through the first curved water conduit 32 to change direction backward. there is
Further, as shown in FIG. 5 , the second curved water conduit 34 of the second rim water conduit 28 is provided downstream and rearward of the first curved water conduit 32 . The second curved water conduit 34 includes an upstream water conduit 34a extending from the downstream end E2 of the first curved water conduit 32 to a rearward bending portion B2, and a right rear area RB of the obliquely rearward bowl portion 6 by the bending portion B2. and a downstream water conduit 34b that extends to the second rim spout 22 after bending toward.
As a result, the wash water that has flowed rearward from the downstream end E2 of the first curved water channel 32 into the upstream water channel 34a of the second curved water channel 34 passes through the curved portion B2 of the second curved water channel 34. As a result, the direction is changed obliquely rearward toward the right rear region RB of the bowl portion 6 . The wash water that has passed through the downstream water conduit 34b is spouted from the second rim spout 22 as second rim spout water.

Here, as shown in FIGS. 1 and 5, the path length from the inlet 28a of the second rim water conduit 28 to the second rim water outlet 22 is equal to the length of the path from the inlet 26a of the first rim water conduit 26 to the first rim outlet. The length is set to be shorter than the path length to the water inlet 20. - 特許庁
In addition, the average channel cross-sectional area in the route from the inlet 28a of the second rim water conduit 28 to the second rim spout 22 is the average of the route from the inlet 26a of the first rim water conduit 26 to the first rim spout 20. It is set smaller than the channel cross-sectional area.
As a result, the second rim water discharge amount V2 [L] and the flow rate Q2 (instantaneous flow rate) [L/min] of the second rim water discharge discharged from the second rim water discharge port 22 are respectively discharged from the first rim water discharge port 20. It is set to be smaller than each of the water discharge amount V1 [L] and the flow rate Q1 (instantaneous flow rate) [L/min] of the first rim water discharge (V2<V1, Q2<Q1).
Incidentally, in the flush toilet 1 of the present embodiment, for example, if the total spouting amount V [L] of flush water W supplied from the water storage tank 10 to the common conduit 24 is 100%, then from the common conduit 24 to the first The water discharge amount V1 [L] of the first rim water discharge W1 supplied to the rim water conduit 26 is preferably set to 70% to 80% of the total water discharge amount V [L]. It is preferable that the water discharge amount V2 [L] of the second rim water discharge W2 supplied to the rim water conduit 28 is set to 20% to 30% of the total water discharge amount V0 [L].

As shown in FIG. 5, the second rim water spout 22 includes a diffusing portion D that diffuses the water flow f2 of the second rim water W2 into a film that is wider than the swirl flow f1 of the first rim water W1.
This diffusing portion D also functions as a drop-flow promoting portion that promotes the formation of an inner water flow f2a in which a portion of the water flow f2 of the second rim spout W2 falls into the pot portion 12 via the right rear region RB of the bowl portion 6. It's working.
In the diffusion portion D, the swirl flow f1 of the first rim water W1 discharged from the first rim water outlet 20 and the water flow f2 of the second rim water W2 discharged from the second rim water outlet 22 join. It also functions as a swirl maintaining portion that maintains swirlability of the wash water W3 in the rear region B of the bowl portion 6 after interference. As a result, the wash water W3 after joining the rear region B of the bowl portion 6 turns to the left side region LM of the bowl portion 6, and then turns to the left front region LF of the bowl portion 6 near the first rim spout 20. It is possible.
Here, as a specific structure of the diffusion portion D of the second rim spout 22, in the plan view shown in FIG. The direction of the road center axis C1 forms a predetermined angle α1 (0°<α1<90°) with respect to the tangential plane T1 of the rim inner wall surface 18a near the rear end of the second rim spout 22 in the rim portion 18. is provided.
The predetermined angle α1 formed by the channel center axis C1 and the tangential plane T1 in plan view shown in FIG. Most preferably. With the above-described configuration, the second rim spout W2 from the second rim spout 22 is 10 to 25 degrees, more preferably 15 to 20 degrees, with respect to the swirl direction of the swirling flow f1 from the first rim spout 30. It crosses diagonally at an angle and joins.

That is, as shown in FIG. 5, the diffusion portion D of the second rim spout 22 causes the opening end face A1 of the second rim spout 22 to extend obliquely rearward toward the right rear region RB of the bowl portion 6. is directed.
As a result, part of the water flow f2 of the second rim spout W2 that has been spouted in advance from the second rim spout 22 to the right rear region RB of the bowl portion 6 can flow down into the pot portion 12 from the rear side. The remainder of the water flow f2 of the second rim spout water W2 can traverse in the left-right direction from the right rear region RB to the left rear region LB of the bowl portion 6 .
On the other hand, as shown in FIGS. 1 and 5, the first rim spout W1 spouted forward from the first rim spout 20 flows from the left front area LF in the bowl portion 6 through the right front area RF to the right side area. When it turns to RM and reaches the vicinity of the second rim water outlet 22, the second rim water is discharged in advance toward the right rear region RB of the bowl portion 6 and crosses the turning direction of the first rim water W1. It can join and interfere with the water flow f2 of W2.

Next, as shown in FIG. 5, as the diffusion portion D of the second rim spout 22, the flow channel width d2 of the downstream side water conduit 34b of the second curved water conduit 34 is the upstream side of the second curved water conduit 34. It is set larger than the channel width d1 of the water conduit 34a.
As a result, the wash water that has flowed backward from the first curved water channel 32 to the second curved water channel 34 is redirected diagonally rearward at the curved portion B2 of the second curved water channel 34, and then flows into the second curved water channel. By passing through the downstream water conduit 34b, the second rim spout W2 spouted obliquely rearward from the second rim spout 22 can be effectively diffused radially to form a wide film. It has become.

Next, as shown in FIGS. 3 to 6, on the filth receiving surface 14 of the right rear region RB of the bowl portion 6, an inclined surface S1 formed obliquely rearward from the second rim spout 22 extends toward the rear side. It is sloping upward.
Further, as shown in FIGS. 3 to 6, in the right rear region RB of the bowl portion 6, on the dirt receiving surface 14 formed on the rear side in the circumferential direction of the bowl portion 6 from the bottom surface 22a of the second rim spout 22. The edge 14a and the shelf surface 16a of the shelf portion 16 are inclined upward from the front side toward the rear end of the rim inner wall surface 18a (rim inner wall surface rear end 18b).

Further, as shown in FIGS. 5 and 6, the second rim water outlet 22 is arranged on a predetermined rim inner wall surface 18c on the upstream upstream side in the circumferential direction from the rim inner wall surface rear end 18b of the rim portion 18. As shown in FIG. The radius of curvature ρ1 of the predetermined rim inner wall surface 18c in plan view is set larger than the radius of curvature ρ2 in plan view of the rim inner wall surface rear end 18b (ρ1>ρ2).

Next, the operation of the flush toilet 1 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 7B.
FIG. 7A schematically illustrates the flow of flush water in the bowl portion of the flush toilet according to one embodiment of the present invention, before the swirling flow of the first rim spout joins the flow of the second rim spout. It is a top view.
FIG. 7B schematically illustrates the flush water flow in the bowl portion of the flush toilet according to the embodiment of the present invention after the swirling flow of the first rim spout joins the water flow of the second rim spout. FIG. 2 is a schematic plan view.
First, as shown in FIGS. 1 and 7A, flushing of the toilet bowl is started, and flush water in the water storage tank 10 is supplied from the inlet 4a of the water conduit 4 of the toilet body 2 to the common water conduit 24. As shown in FIGS. The wash water W in the common water conduit 24 branches into a first rim water conduit 26 and a second rim water conduit 28 as first wash water W1 and second wash water W2, respectively.

As shown in FIGS. 1 and 7A, the first wash water W1 in the first rim water conduit 26 is spouted forward from the first rim spout 20 on the downstream side as the first rim spout water W1. The first rim water discharge W1 forms a swirling flow f1 that swirls from the left front area LF in the bowl portion 6 to the right front area RF to the right side area RM.
On the other hand, as shown in FIGS. 1, 5 and 7A, the second wash water W2 in the second rim water conduit 28 flows from the outer water conduit 30 into the front first curved water conduit 32, and flows into the first curved water conduit 32. By passing through the bent portion B1 of the water channel 32, the water changes direction and flows backward.
After that, the second wash water W2 that has passed through the first curved water channel 32 flows into the upstream water channel 34a of the second curved water channel 34 behind it, and is obliquely rearward at the curved portion B2 of the second curved water channel 34. After being diverted to the downstream water channel 34b, it passes through the downstream water channel 34b, which is the diffused portion D of the second rim spout 22 .
Then, the second wash water W2 is spouted from the second rim spout 22 as the second rim spout W2. The second rim water discharge W2 is diffused toward the right rear area RB in the bowl portion 6, forming a film-like water flow f2 that is wider than the swirl flow f1 of the first rim water discharge W1.
Here, since the length of the second rim water conduit 28 is set to be shorter than the length of the first rim water conduit 26, the swirling flow f1 of the first rim water discharge W1 is generated in the right rear region RB of the bowl portion 6. The second rim water discharge W2 is performed in advance from the second rim water discharge port 22 at an early timing before reaching the area where the water flow f2 of the second rim water discharge W2 joins and interferes with.

Further, as shown in FIGS. 5 and 7A, the water flow f2 of the second rim spout W2 immediately after the start of spouting from the second rim spout 22 has a generally fan-like shape from the upstream side to the downstream side in plan view. It has a wide, membranous shape that spreads out.
Furthermore, the water flow f2 of the second rim water flow W2 immediately after the start of water discharge forms a wide film-like water flow in a range generally between the inner water flow f2a and the outer water flow f2b.
As shown in FIGS. 5 and 7A, the inner water flow f2a of the second rim water discharge W2a is the water flow of the second rim water discharge W2a in the first direction from the second rim water discharge port 22 toward the rear region B of the bowl portion 6. be.
On the other hand, the outer water flow f2b of the second rim water discharge W2 is the water flow of the second rim water discharge W2b in the same second direction as the swirling direction of the swirling flow f1 of the first rim water discharge W1.
In addition, the flow rate (first flow rate Q2a [L/min]) of the inner water flow f2a of the second rim spout W2a is larger than the flow rate (second flow rate Q2b [L/min]) of the outer water flow f2b (Q2a> Q2b).

Next, as shown in FIGS. 1, 5, and 7B, the swirling flow f1 of the first rim spout W1 spouted from the first rim spout 20 flows from the left front region LF to the right front region in the bowl portion 6. After turning to the right side region RM via RF and reaching the vicinity of the second rim water outlet 22, water is discharged in advance toward the right rear region RB of the bowl portion 6 and crosses the turning direction of the first rim water discharge W1. merges with and interferes with the water flow f2 of the second rim spout W2.
As a result, as shown in FIG. 7B, the wash water W3 after the confluence of the first rim spout water W1 and the second rim spout water W2 is guided to the right rear region RB of the bowl portion 6 on the rear side of the pot portion 12. , a water flow f3, which is part of the washing water W3, flows down into the pot portion 12 from the rear side.
Further, as shown in FIG. 7B , a water flow f4 of a portion of the merged cleansing water W3 guided to the right rear region RB of the bowl portion 6 swirls from the left rear region LR of the bowl portion 6 to the left side region LM. After that, it flows into the pot portion 12 from the left side.
On the other hand, as shown in FIG. 7B, the remaining water flow f5 of the wash water W3 after joining the right rear region RB of the bowl portion 6 flows from the left rear region LB of the bowl portion 6 to the front region F via the left side region LM. swirl.
Then, as shown in FIG. 7B, the water flow f5 in the front area F of the bowl portion 6 is a water flow that quickly diverges from the swirl flow f1 of the first rim spout W1 in the front area F of the bowl portion 6 and flows down. By joining with, it becomes a water flow f6, and this water flow f6 flows into the pot part 12 from the front side.
As a result, the contaminant receiving surface in the rear region B of the bowl portion 6 and the rim portion 18, to which contaminants are likely to adhere, are extensively washed by the combined washing water W3, and the contaminants washed in the bowl portion 6 are removed from the pot portion. 12 to waste trap line 8.

According to the flush toilet 1 according to the embodiment of the present invention described above, the first rim spout 20 is arranged forward of the front end T of the pot portion 12 of the bowl portion 6 .
As a result, the swirling flow f1 of the first rim spout water W1 having a high speed and a large flow rate can be efficiently guided to the dirt receiving surface 14 and the rim portion 18 on the rear side of the pot portion 12 in the rear area B of the bowl portion 6 .
Further, the second rim water discharge W2 can be performed by the second rim water discharge port 22 so as to cross the swirling direction of the swirl flow f1 of the first rim water discharge W1 discharged from the first rim water discharge port 20 . Therefore, the swirl flow f1 of the first rim water W1 having a high flow rate Q1 [L/min] at a high speed can be combined with the water flow f2 of the second rim water W2 to efficiently interfere with each other.
As a result, the more forward the first rim spout 20 is located than the front end T of the pot portion 12 of the bowl portion 6, the more the swirling flow f1 of the first rim spout W1 becomes faster and larger in the rear region B of the bowl portion 6. It is possible to prevent the swirling flow f1 of the first rim spout W1 from interfering with the second rim spout W2 from dropping in the rear region B of the bowl portion 6 even if the flow rate is guided.
Therefore, it is possible to improve the detergency of the first rim water discharge W1 and the second rim water discharge W2 for washing the dirt receiving surface 14 and the rim portion 18 in the rear area B rather than the pot portion 12 of the bowl portion 6 .
Furthermore, the diffusion portion D of the second rim water outlet 22 can radially diffuse the second rim water W2 discharged from the second rim water outlet 22, so that the second rim water W2 is diverged from the first rim water W1. It is wider than the swirling flow f1 of , and can be formed into a film. As a result, the swirling flow f1 of the first rim water discharge W1 having a high speed and a large flow rate and the wide film-like second rim water discharge W2 can be guided to the rear region B of the bowl portion 6 while causing interference.
Therefore, the first rim water discharge W1 at a high speed and a large flow rate can be efficiently supplied to the rear region B of the bowl portion 6 where dirt is likely to adhere while being interfered with the second rim water discharge W2. It is possible to improve the detergency over a wide area of the rear area B of the part 6 .

Next, according to the flush toilet 1 according to the present embodiment, the diffusion portion D of the second rim spout 22 spreads the wide and film-like second rim spout W2 spouted from the second rim spout 22 at high speed. can be guided to traverse the rear area B of the bowl portion 6 in the left-right direction while interfering with the swirl flow f1 of the first rim spout water W1 having a large flow rate.
Therefore, the entire rear area B of the bowl portion 6 can be washed over a wide range by the swirling flow f1 of the first rim spout water W1 of high speed and large flow rate and the wide film-like water flow f2 of the second rim spout water W2. .

Further, according to the flush toilet 1 according to the present embodiment, the diffusion portion D of the second rim water outlet 22 converts the second rim water W2 discharged from the second rim water outlet 22 into a swirling flow of the first rim water W1. By guiding it to the rear region B of the bowl portion 6 together with f1, the rear region B of the bowl portion 6 to which dirt tends to adhere can be reliably washed.
In addition, after at least part of the second rim water discharge W2 traverses the rear region B of the bowl portion 6 in the left-right direction, it is distributed along the rim inner wall surface 18a of the rim portion 18 in the rear region B of the bowl portion 6 to the first water discharge W2. It can also be turned to the rim spout 20 side. As a result, it is possible to ensure cleansability even in the region from the rear region B of the bowl portion 6 to at least the first rim spout 20 in front of the front end T of the pot portion 12 .
Therefore, by effectively utilizing the first rim water discharge W1 and the second rim water discharge W2, it is possible to improve the detergency of the rear region B of the bowl portion 6, and to the left rear of the bowl portion 6 where dirt tends to remain. Since the area LB and the left side area LM in front of the area LB can also be sufficiently washed, it is possible to ensure washability over the entire bowl portion 6 .

Furthermore, according to the flush toilet 1 of the present embodiment described above, the channel center axis of the diffusion portion D of the second rim spout 22 (the downstream water channel 34b of the second curved water channel 34 and the second rim spout 22 forms an angle α1 with respect to the tangential plane T1 of the rim inner wall surface 18a in the vicinity of the rear end of the second rim spout 22 in the rim portion 18 . As a result, the second rim water discharge W2 can be discharged from the second rim water discharge port 22 toward the right rear region RB of the bowl portion 6 obliquely rearward.
Further, the second rim water jet W2 thus discharged is diffused radially so as to effectively cross the swirl direction of the swirling flow f1 of the first rim water jet W1, forming a wide film-like water flow f2. can do.
Furthermore, the phenomenon that the second rim water spout W2 is attracted to the rim inner wall surface 18a near the front and rear of the second rim water spout 22 in the rim portion 18 (so-called Coanda phenomenon) can be suppressed. Therefore, the second rim spout W2 flows in the same swirl direction together with the swirling flow f1 of the first rim spout water W1, and all of the combined cleansing water W3 does not drop in the rear region B of the bowl portion 6. , it is possible to suppress simply turning.
As a result, the swirling flow f1 of the first rim water discharge W1 with a high speed and a large flow rate and the wide film-like second rim water discharge W2 discharged obliquely backward are joined and moderately interfered with each other, and the rearward of the bowl portion 6. It is possible to effectively guide the entire area B in the left-right direction and the front-rear direction.

Further, according to the flush toilet 1 according to the present embodiment, the flush water W supplied from the water storage tank 10, which is the flush water source, to the common water conduit 24 is the first water W1 supplied to the first rim water conduit 26. and the second wash water W2 supplied to the second rim water conduit 28 .
Then, the second wash water W2 supplied to the second rim water conduit 28 flows from the outer water conduit 30 into the front first curved water conduit 32 and passes through the bent portion B1 of the first curved water conduit 32. It changes direction and flows backward.
After that, the second wash water W2 that has passed through the first curved water channel 32 flows into the upstream water channel 34a of the second curved water channel 34 behind it, and is obliquely rearward at the curved portion B2 of the second curved water channel 34. After being diverted to the downstream water channel 34b, it passes through the downstream water channel 34b, which is the diffused portion D of the second rim spout 22 .
At this time, the second wash water W2 flowing backward from the bent portion B1 of the first bent water passage 32 to the upstream side water passage 34a of the second bent water passage 34 obliquely flows at the bent portion B2 of the second bent water passage 34. When the direction is changed backward, the flow velocity of the second wash water W2 can be reduced.
As a result, when the second rim water discharge W2 is discharged from the second rim water discharge port 22 through the downstream water conduit 34b, which is the diffusion portion D of the second rim water discharge port 22, the second rim water discharge W2 is likely to diffuse radially diagonally rearward from the second rim spout 22, the wide film-like water flow f2 of the second rim spout W2 can be formed.
As a result, the second rim water jet W2, which is wider than the first rim water jet W1 and is in the form of a film, can be made to traverse the swirl direction of the swirl flow f1 of the first rim water jet W1 with a large flow rate at a high speed. The first rim water discharge W1 and the second rim water discharge W2 can be effectively interfered with each other.
In addition, the phenomenon that the second rim water W2 discharged from the second rim water outlet 22 is attracted to the rim wall surface near the front and rear of the second rim water outlet 22 in the rim portion 18 (so-called Coanda phenomenon) is also effectively suppressed. can do.
Therefore, the second rim spout W2 flows in the same swirl direction together with the swirling flow f1 of the first rim spout water W1, and all of the combined cleansing water W3 does not drop in the rear region B of the bowl portion 6. , can be effectively suppressed from simply turning.

Furthermore, according to the flush toilet 1 according to the present embodiment, the diffusion portion D is the downstream water conduit 34b formed downstream of the bent portion B2 of the second curved water conduit 34, and this downstream water conduit The width of 34b can be set wider than the width of the water channel on the upstream side of the bent portion B2 in the second curved water channel 34 .
As a result, the wash water W2 that has flowed backward from the first curved water channel to the second curved water channel 34 is changed in direction obliquely rearward at the curved portion B2 of the second curved water channel 34, and then flows into the second curved water channel. By passing through the downstream water conduit 34b of 34, the second rim spouting water spouted obliquely rearward from the second rim spouting port 22 can be effectively diffused radially to form a wide film.
Therefore, in the right rear region RB of the bowl portion 6, the swirl flow f1 of the first rim water discharge W1 with a high flow rate and a high flow rate and the wide, film-like water flow f2 of the second rim water discharge W2 discharged obliquely rearward are merged. It is possible to guide the wash water more effectively over the entire rear region B of the bowl portion 6 in the left-right direction and the front-rear direction while causing moderate interference.

1 flush toilet bowl 2 toilet body 4 water conduit 4a inlet of water conduit 6 bowl portion 8 drain trap pipe (drain trap portion)
8a Inlet of drain trap line 8b Downstream of drain trap line 8c Ascend of drain trap line 10 Water storage tank (washing water source)
12 pot portion 12a bottom wall of pot portion 12b left side wall of pot portion 12c right side wall of pot portion 12d rear wall of pot portion 14 waste receiving surface 14a top edge of waste receiving surface 16 shelf portion 16a shelf surface 18 rim portion 18a rim interior Wall surface (rim wall surface)
18b Rear end of rim inner wall surface 18c Predetermined rim inner wall surface (predetermined rim wall surface)
20 1st rim spout (1st rim spout)
22 2nd rim spout (2nd rim spout)
22a bottom surface of second rim spout 24 common waterway 26 first rim waterway 28 second rim waterway 28a inlet of second rim waterway 30 outer waterway of second rim waterway 32 second waterway of second rim waterway 1 curved waterway 34 2nd curved waterway of the 2nd rim waterway 34a upstream side waterway of the 2nd curved waterway 34b downstream side waterway of the 2nd curved waterway A1 opening end face of the 2nd rim spout B bowl portion B1 Bent portion of the first curved waterway B2 Bent portion of the second curved waterway C1 Channel center axis line of the second rim spout and the downstream waterway of the second curved waterway section, rotation maintenance section)
d1 Flow path width of the upstream side of the second curved waterway d2 Flow path width of the downstream side of the second curved waterway E1 Front end (downstream end) of the outer waterway, upstream end of the first curved waterway E2 Downstream end of first curved water conduit F Front region of bowl f1 Swirling flow of first rim spout f2 Water flow of second rim spout f2a Inside water flow of second rim spout (water flow of second rim spout in first direction)
f2b outer water flow of the second rim spout (water flow of the second rim spout in the first direction)
f3 Partial flow of cleansing water after confluence of first and second rim jets f4 Partial flow of cleansing water after confluence of first and second rim jets f5 First and second rim jets Partial flow of cleansing water after confluence of rim spout f6 Partial flow of cleansing water after confluence of first rim spout and second rim spout h Drain port L Left area of bowl LB Left rear area of bowl LF Left front area of bowl LM Left side area of bowl L1 Boundary line between pot and waste receiving surface, upper edge of pot, lower edge of waste receiving surface M Between front region and rear region of bowl O Center of bowl O1 Center of pot in front-rear direction P1 Upper edge and front end position of pot P2 Upper edge and rear end of pot Q1 Flow rate (instantaneous flow rate) of first rim spout
Q2 No. 2 rim spout flow rate (instantaneous flow rate)
Q2a Flow rate of second rim spout in first direction (instantaneous flow rate)
Q2b Flow rate of second rim spout in second direction (instantaneous flow rate)
R Right side area of bowl RB Right rear area of bowl RF Right front area of bowl RM Right side area of bowl S1 Inclined surface (diagonally behind the second rim spout on the filth receiving surface in the right rear area of the bowl) face formed toward)
T Tip of pot (front end of pot)
T1 Tangential plane u1 Flow velocity u2 Flow velocity V1 Water discharge amount V2 Water discharge amount W Wash water W0 Accumulated water W1 First wash water, first rim water discharge W2 Second wash water, second rim water discharge W2a Second rim water discharge in first direction W2b Water discharged from the second rim in two directions W3 Washing water after the water discharged from the first rim and the water discharged from the second rim merge WL Water level of accumulated water (water surface)
X Horizontal center axis of the bowl Y Horizontal center axis of the bowl Z Vertical center axis passing through the center of the bowl Radius of curvature in plan view ρ2 Radius of curvature in plan view of the rear end of the rim inner wall surface of the rim

Claims (6)

A flush toilet that is flushed with flush water supplied from a flush water source to discharge waste,
It comprises a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a pot portion provided under the waste receiving surface for storing pooled water to form a water seal. a bowl portion;
a drainage trap portion connected to the pot portion to discharge filth;
A first rim water spout provided on one side of the rim portion in the left-right direction of the bowl portion to perform a first rim water spout for spouting cleansing water forward and forming a swirling flow swirling along the rim portion. Department and
a second rim water spouting portion provided on the rim portion on the other side in the left-right direction of the bowl portion and performing second rim water spouting to spout cleansing water at a flow rate smaller than that of the first rim water spouting portion;
The first rim water spouting portion has a first rim water spout disposed forward of the front end of the pot portion,
The second rim water spouting section causes the second rim water spout to traverse the swirl direction of the swirl flow of the first rim spout water to interfere with the swirl flow of the first rim spout water. a second rim spout configured to lead to a rear region of the bowl portion on the rear side of the
The flush toilet, wherein the second rim spout includes a diffusing portion for diffusing the second rim spout in a film-like manner with a width wider than that of the swirling flow of the first rim spout. 2. The flush toilet according to claim 1, wherein said diffusing portion guides the second rim spout water spouted from said second rim spout port so as to traverse the rear region of said bowl portion in the lateral direction. The diffusing portion causes at least part of the second rim spouting water spouted from the second rim spout to traverse the rear region of the bowl portion in the left-right direction, and then the wall surface of the rim portion in the rear region of the bowl portion. 3. The flush toilet according to claim 1 or 2, which is configured so as to be able to turn along the first rim spout side. 4. The diffusing portion is provided so that the direction of the center axis of the flow channel forms an angle with respect to the tangential plane of the rim wall surface in the vicinity of the rear end of the second rim spout in the rim portion. The flush toilet bowl according to any one of 1. further comprising a second rim conduit for guiding wash water supplied from the wash water source to the second rim water discharge section;
The second rim water conduit consists of a first curved water conduit that changes the direction of wash water flowing forward from the upstream side to the rear, and a second curved water conduit that is provided downstream and rearward of the first curved water conduit. and a water channel, wherein the second curved water channel has a curved portion that changes the direction of the wash water flowing rearward by the first curved water channel obliquely rearward, and is located downstream of the curved portion. The flush toilet according to any one of claims 1 to 4, wherein the diffusion portion is provided. The diffusion part is a downstream water conduit formed downstream of the bent part of the second bent water conduit, and the width of the downstream water conduit is wider than the bent part of the second bent water conduit. 6. The flush toilet according to claim 5, wherein the width is set larger than the width of the water conduit on the upstream side.

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