JP2017129007A - Water closet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water closet which is constructed to strengthen the power of washing water flowing from a rim water leading passage to a rim water passage and easily form a swirling flow around the rim water passage so that, even when setting the amount of the washing water to be smaller in use for washing a toilet bowl, the washing water can swirl once around a bowl part to sufficiently wash the bowl part.SOLUTION: A water closet 1 includes a water supply device 4, a bowl part 8 having a rim portion 18, a rim water passage 20 formed all over the periphery of the rim portion to guide washing water, and a water discharge portion as a slit opening 26 formed all over the periphery of the rim water passage in its downward direction, a water discharge passage 14, and a behind-rim water leading passage 10 formed between a supply port 6 and the rim water passage, the behind-rim water leading passage 10 having an upstream side rim water leading passage 28 extending from the supply port to one side in the cross direction of a toilet bowl body, and a downstream side rim water leading passage 30 extending from the upstream side rim water leading passage to the other side in the cross direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flush toilet, and more particularly, to a flush toilet in which a toilet body is washed with wash water supplied from a wash water source to discharge filth.

Conventionally, for example, a conventional flush toilet as shown in Patent Document 1 and a conventional flush toilet 301 having a structure similar to that of Patent Document 1 as shown in FIG. An open rim structure having a slit opening 312 on the bottom surface of the rim water passage 306 is known. In such an open rim structure, by adjusting the width of the slit opening 312 between the rim 304 and the bowl portion 308, the amount of cleaning water flowing from the rim 304 to the bowl portion 308 is adjusted.
As shown in FIG. 7, in the flush toilet 301 having the conventional open rim structure of Patent Document 1, the supplied wash water divides the rim water passage 306 in the clockwise direction and the counterclockwise direction. The water conduit 310 is connected to the rim water passage 306 of the rim 304 in the vicinity of the center of the toilet body 302 so that the bowl portion 308 can be washed away.

Japanese Patent No. 4062731

  However, in such a conventional flush toilet 301, when the amount of washing water is reduced and washing is performed with a small amount of washing water due to the recent demand for water saving, the washing water supplied to the rim water passage 306 is washed. As the amount of water is reduced, the momentum is weak, and most of the washing water from the slit opening 312 near the outlet of the water conduit 310 that is bent from the center of the toilet body just before the merging portion, as indicated by the arrow B1, As a result, the water flowing down to the portion 308 becomes insufficient, so that the washing water to be swirled along the rim water passage 306 becomes insufficient, and as shown by the arrow B2, there arises a problem that the washing of the bowl portion 308 becomes poor.

In addition, simply reducing the width of the slit opening 312 to reduce the wash water flowing down from the slit opening 312 in the vicinity of the outlet of the water conduit 310 will still try to turn the rim water passage 306. There is a problem that the momentum of the washing water cannot be increased, and the washing water cannot turn sufficiently so as to go around the rim water passage.
In addition, there is a problem that forming the slit opening 312 with a small width makes it difficult to mold in manufacturing, and the width of the slit opening 312 cannot be reduced substantially.

  Furthermore, as shown in FIG. 7, the structure in which the direction of the toilet body is changed from the center of the toilet body just before the junction of the water conduit and the rim water passage is to rotate the supplied wash water clockwise from the center in the water passage of the rim. Since it is premised on the idea of dividing it in the direction and counterclockwise direction and flowing it through the entire water passage of the rim, even if the amount of cleaning water is reduced based on the conventional structure as described above, There was also a problem that a flow having a relatively strong momentum that could be swirled sufficiently to make a round of the rim water passage could not be formed.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and the momentum of the washing water flowing from the rim conduit to the rim conduit is strengthened and the rim conduit is swirled. Even when the amount of water used for toilet cleaning is set to be small, the water can be swirled so that the water circulates around the bowl, and the bowl can be sufficiently washed. The purpose is to provide a toilet.

In order to achieve the above-described object, the present invention provides a flush toilet that flushes a toilet body with flush water, a water supply device that supplies wash water to a supply port of the toilet body, a bowl-shaped filth receiving surface, A rim portion at the edge, a rim water passage formed around the entire circumference of the rim portion to guide the cleaning water, and a water discharge portion which is a slit opening formed all around the rim water passage. And a rim rear water conduit formed between the supply port and the rim water passage. Has an upstream rim conduit that extends from the supply port to one side in the left-right direction of the toilet body, and a downstream rim conduit that extends from the upstream rim conduit to the other side in the left-right direction. It is a feature.
In the present invention configured as described above, the wash water is changed in direction from the upstream rim conduit that extends to one side in the left-right direction of the toilet body, and flows into the downstream rim conduit so that the downstream rim Along the water guide channel, it is guided over a relatively long length to the other side in the left-right direction. Therefore, the momentum of the washing water flowing from the downstream rim conduit to the rim conduit is strengthened, and even if the size of the slit opening is not reduced, there is a flow that tries to turn the rim conduit. It becomes easier to form. Accordingly, it is possible to increase the momentum of the washing water that tries to turn the rim water passage. Therefore, even when the amount of washing water used for toilet flushing is set to be small, the washing water can be swung around the rim water passage so that the bowl portion can be sufficiently washed.

In the present invention, preferably, the downstream rim conduit is formed substantially linearly at a predetermined distance.
In the present invention configured as described above, since the downstream rim conduit is formed substantially linearly at a predetermined distance, the wash water whose direction is changed from the upstream rim conduit is used as the downstream rim conduit. It can be rectified in the water conduit. Therefore, the momentum of the washing water when flowing from the downstream rim conduit to the rim conduit is increased, and a flow that tends to swivel the rim conduit is easily formed.

In the present invention, preferably, the downstream rim conduit is formed between attachment portions for attaching the toilet seat on the toilet body.
In this invention comprised in this way, a downstream rim water conduit can be provided avoiding the attaching part which attaches a toilet seat on a toilet bowl main body.

In the present invention, preferably, the outer wall surface of the downstream rim conduit and the outer wall surface of the rim water channel are continuously formed substantially flat.
In the present invention configured as described above, since the outer wall surface of the downstream rim conduit and the outer wall surface of the rim conduit are formed to be substantially flat and continuous, the downstream rim conduit is connected to the rim conduit. It is possible to suppress the pressure loss that the washing water flowing in the tank receives.

In the present invention, preferably, the central axis of the upstream rim conduit is eccentrically extended from the center of the supply port toward the extending direction of the upstream rim conduit in the left-right direction.
In the present invention configured as described above, the central axis of the upstream rim conduit extending from the supply port to one side in the left-right direction of the toilet body is the upstream rim conduit in the left-right direction from the center of the supply port. Since the cleaning water flowing out from the supply port is eccentrically extended in the direction in which the upstream rim conduit is extended, it is compared with the eccentric upstream rim conduit from the direction in which the upstream rim conduit extends in the left-right direction from the center of the supply port. Can flow out smoothly. Therefore, compared to the case where the central axis of the upstream rim conduit is not eccentric from the center of the supply port, the upstream rim guide is relatively smoothly from the upstream rim conduit where the supply water is eccentric. Can flow into waterways.

In the present invention, preferably, the outer wall surface of the upstream rim conduit is connected to the wall surface of the supply port along a tangent line of the wall surface of the supply port.
In the present invention configured as described above, the cleaning water supplied from the supply port flows along the outer wall surface of the upstream rim conduit along the tangent line of the wall surface from the wall surface of the supply port. It can flow smoothly while keeping. Accordingly, it is possible to relatively increase the momentum of the cleaning water flowing through the upstream rim conduit.

In the present invention, preferably, the bent portion formed between the outlet portion of the upstream rim conduit and the inlet portion of the downstream rim conduit has the radius of the arc of the outer peripheral wall of the passage. Is formed smaller than the radius of the arc of the inner peripheral wall.
In the present invention configured as described above, since the radius of the arc of the outer peripheral wall of the channel of the bent portion is smaller than the radius of the arc of the inner peripheral wall of the channel, the flow along the outer peripheral wall of the channel of the bent portion Can be guided toward the flow along the inner peripheral wall side of the flow path of the bent portion, and the wash water flows toward the rim water passage along the wall surface extending from the inner peripheral wall side to the downstream rim conduit. As the momentum increases, the flow that tends to turn the rim water passage becomes easier to form.

In the present invention, preferably in a flush toilet for washing the toilet body with wash water, a water supply device for supplying the wash water to the supply port of the toilet body, a bowl-shaped waste receiving surface, and a rim portion at the upper edge A bowl portion comprising: a rim water passage that is formed on the inner periphery of the rim portion and guides wash water; and a water discharge portion that is opened on the rim water passage and discharges wash water into the bowl portion; A rim rear water conduit formed between the supply port and the water discharge part, and the rim rear water conduit is connected to the toilet body from the supply port. It has an upstream rim conduit that extends to one side in the left-right direction and a downstream rim conduit that extends from the upstream rim conduit to the other side in the left-right direction.
In the present invention configured as described above, the wash water is changed in direction from the upstream rim conduit that extends to one side in the left-right direction of the toilet body, and flows into the downstream rim conduit so that the downstream rim Along the water guide channel, it is guided over a relatively long length to the other side in the left-right direction. Accordingly, even when the rim portion other than the open rim portion is adopted, the momentum of the washing water when flowing from the downstream rim conduit to the rim passage through the water discharge portion is strengthened, and the rim passage is employed. It is easy to form a flow to turn. Accordingly, it is possible to increase the momentum of the washing water that tries to turn the rim water passage. Therefore, even when the amount of washing water used for toilet flushing is set to be small, the washing water can make a good turn in the rim water passage, and the bowl portion can be sufficiently washed.

  According to the flush toilet of the present invention, the momentum of the wash water flowing from the rim waterway to the rim waterway is strengthened, and a flow that tends to turn around the rim waterway is easily formed, which is used for toilet flushing. Even when the amount of washing water is set to be small, the washing water can be swung so as to go around the bowl portion, and the bowl portion can be sufficiently washed.

It is side surface sectional drawing which shows the flush toilet bowl by 1st Embodiment of this invention. It is a top view of the toilet bowl body of the flush toilet according to the first embodiment of the present invention. It is sectional drawing seen along the III-III line of FIG. It is a top view of the toilet bowl main part of the flush toilet bowl by 2nd Embodiment of this invention. It is a top view of the toilet bowl main part of the flush toilet bowl by 3rd Embodiment of this invention. It is a general | schematic fragmentary enlarged view which shows the flow path of the back upper part of a toilet bowl main body in the flush toilet by the 3rd plan embodiment of this invention. It is a top view of the toilet body of the conventional flush toilet.

Hereinafter, a flush toilet according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side sectional view showing a flush toilet according to the first embodiment of the present invention, FIG. 2 is a plan view of a toilet body of the flush toilet according to the first embodiment of the present invention, and FIG. It is sectional drawing seen along the III-III line. In FIG. 2, the flow of cleaning water is indicated by arrows. Hereinafter, in the description of the embodiment of the present invention, the right side when the toilet body 2 is viewed from the front is the right side, and the left side when viewed from the front is the left side.
As shown in FIGS. 1 to 3, the flush toilet 1 according to the first embodiment of the present invention has a toilet body 2 made of ceramics or the like. In addition, a water supply device indicated by a water storage tank 4 serving as a washing water source is installed above the toilet body 2 on the rear side. Further, the water storage tank 4 is connected to a water supply source (not shown) such as a water supply. When a cleaning operation is started by operating an operation lever (not shown) provided in the water storage tank 4, a drain valve (not shown) of the water storage tank 4 is opened, and a predetermined amount of cleaning water (for example, 6 liters) is supplied to the supply port 6 opened in the upper part of the central rear side of the toilet body 2. The supply port 6 may be formed not only in the center but also shifted from the central axis C to the right side or the left side.
Further, in the flush toilet 1 of the present embodiment, the water-saving flush toilet with the amount of flush water supplied from the water storage tank 4 in the range of 3 to 6 liters, preferably in the range of 4.8 to 6 liters. It can be used for water-saving flush toilets.
The water supply device indicated by the water storage tank 4 may be another water supply device such as a flush valve capable of supplying a specified amount of cleaning water in addition to the water storage tank.

A bowl portion 8 is formed at the front upper portion of the toilet body 2, and a rear upper portion of the toilet body 2 is formed between a supply port 6 and a rim water passage 20 described later, and is supplied from the water storage tank 4. A rim rear water guide passage 10 is formed to guide the wash water from the supply port 6 to the bowl portion 8.
Further, a reservoir portion 12 is formed below the bowl portion 8 to store a predetermined amount of reservoir water whose initial water level is indicated by W0. Further, an inlet 14a of a drain trap pipe 14 is connected to the lower end of the water reservoir 12, the drain trap pipe 14 extends rearward from the inlet 14a, and a rear end 14b is installed on the floor surface. Connected to a discharge pipe (not shown).

The bowl portion 8 includes a filth receiving surface 16 that is formed in a bowl shape, and a rim portion 18 that is formed on the upper edge of the bowl portion 8 and discharges cleaning water to the filth receiving surface 16. The rim portion 18 extends downward from its upper surface to the vicinity of the filth receiving surface 16 and forms a rim passage wall portion 22 that forms a rim water passage 20 inside the rim portion 18 (outside as seen from the center of the toilet body). It has.
Further, the rim portion 18 has a shape in which the rim hanging wall portion 22 is overhanged so that the washing water in the rim water passage 20 does not jump out, and is formed along the circumferential direction of the rim portion 18. In addition, an inner side and a lower side of the rim water passage 20 are opened over the entire circumference to form a slit opening 26, which is an open rim portion having a so-called open rim type configuration.
A slit opening 26 formed in a slit shape that opens downward between the rim water passage bottom surface 24 and the rim hanging wall portion 22 on the inner side (inner side) of the rim water passage 20 allows cleaning water to be filthated. A water discharge portion for discharging water is formed on the receiving surface 16.

In addition, a shelf-like rim water passage bottom surface 24 is formed in the bowl portion 8 between the filth receiving surface 16 and the rim portion 18 and formed over the entire circumference of the bowl portion 8. The rim water passage bottom surface 24 forms a flat surface formed in an annular shape at the upper part of the bowl portion 8, and this flat surface is formed substantially horizontally from the outer side to the inner side of the bowl portion 8. The height position on the front side of the rim water passage bottom surface 24 is formed to be slightly lower than the height position on the rear side.
With such a configuration, it is possible to form a flow in which the cleaning water supplied from the rim rear conduit 10 flows around the upper portion of the bowl portion 8 while flowing on the rim water passage bottom surface 24 in the rim water passage 20. . That is, the flush toilet in the present embodiment is a type of flush toilet that forms a one-way flow in which the wash water circulates clockwise or counterclockwise from the left and right sides in the rim water passage 20 having an open rim type structure. It is a toilet.

Next, the rim rear water conduit will be described in detail.
As shown in FIGS. 1 and 2, a supply port 6 connected to the downstream end of the water storage tank 4 is formed at the rear end of the rim rear water guide channel 10 on the rear side of the toilet body 2. The wash water supplied from the water is discharged from the supply port 6 to the rim rear water conduit 10 on the rear side of the toilet body 2 and flows into the rim water conduit 20 from the rim rear water conduit 10.

  The rim rear water conduit 10 includes an upstream rim rear water conduit 28 extending from the vicinity of the supply port 6 disposed substantially in the center when viewed from the front of the toilet body to one side in the left-right direction of the toilet body 2, and the upstream side A downstream rim rear water conduit 30 extending from the rim rear water conduit 28 to the other side in the left-right direction is provided. The rim rear water guide channel 10 forms a left-right asymmetric channel with respect to the central axis C. The rim rear conduit 10 is formed in a “<” shape by another upstream rim rear conduit 28 and downstream rim rear conduit 30 (for example, a boomerang shape or a shape like a dog's rear leg). ). A bent portion 32 that connects the upstream rim rear water conduit 28 and the downstream rim rear water conduit 30 extending in different directions is eccentrically positioned in the right region with respect to the central axis C in the front-rear direction of the toilet body 2. Yes. The bent portion 32 is formed by an upstream rim conduit outlet portion 28a and a downstream rim conduit inlet portion 30a described later. The downstream rim rear water guide channel 30 is formed so as to be decentered gradually toward the left region after returning from the upstream side toward the downstream side on the central axis C. Therefore, the rim rear water guide channel 10 is formed so that the entire length of the water guide channel is longer than the conventional one.

The upstream rim rear water conduit 28 extends linearly obliquely from the supply port 6 on the central axis C of the toilet body 2 toward the right side, and is disposed at an asymmetrical position with respect to the central axis C. It extends to the upstream rim conduit outlet portion 28a disposed in the vicinity of the right side. The upstream rim rear water guide channel 28 is formed so as to be gradually decentered to the right region with respect to the central axis C from the upstream toward the downstream.
The central axis A1 of the upstream rim rear water guide channel 28 is disposed such that the front side is inclined rightward outward with respect to the central axis C.

The downstream rim rear conduit 30 extends to the left from the downstream rim conduit inlet 30 a connected to the upstream rim conduit outlet 28 a and is connected to the left rear region 20 a of the rim conduit 20. A flow path reaching the rim conduit outlet section 30b is formed. The downstream rim rear conduit 30 forms a linear flow path that obliquely crosses the central axis C of the toilet body 2 from the downstream rim conduit entrance 30a to the downstream rim conduit exit 30b. ing.
The central axis A2 of the downstream rim rear water guide channel 30 is disposed such that the front side is inclined leftward outward with respect to the central axis C. The intersection of the central axis A1 of the upstream rim rear conduit 28 and the central axis A2 of the downstream rim rear conduit 30 is located on the right side with respect to the central axis C, whereas the downstream rim conduit outlet portion 30 b is located on the left side opposite to the central axis C.

The downstream rim rear water conduit 30 has its downstream rim water conduit inlet portion 30a disposed in the central vicinity region on the right side with respect to the central axis C, and its downstream rim conduit conduit portion 30b extends to the central axis C. On the other hand, it is arranged in the left rear region of the left bowl portion 8. Therefore, the downstream rim rear water guide channel 30 forms a relatively long predetermined length L of a flow path extending from the right side of the central axis C to the left rear region of the bowl portion 8 beyond the central axis C. Since the downstream rim conduit entrance 30a is disposed on the right side with respect to the central axis C, the downstream rim conduit exit located at the left rear region of the bowl portion 8 from the downstream rim conduit 30a. The length up to 30b is set to a relatively long length.
The length L of the downstream rim rear conduit 30 is a downstream rim guide from the entrance on the central axis to the exit on the left rear region in a conventional toilet body as shown in FIG. The length is longer than the length l of the water channel.
Since the downstream rim rear water conduit 30 has a relatively long channel L, the wash water is well rectified in the downstream rim rear water conduit 30 in the direction of the downstream rim rear water conduit 30. The directionality of the washing water can be enhanced, and the water discharged by the flow that is arranged in a direction to go around the rim water passage 20 from the downstream rim conduit outlet portion 30b and has a relatively strong water state. Is done. The length L of the flow path of the downstream rim conduit is set to a length of 25 mm to 115 mm.

Further, the downstream rim rear water guide channel 30 is formed so that a part thereof is parallel to a part of the merging portion of the rim water channel 20. In the vicinity of the downstream rim conduit outlet 30b, the direction of the central axis A2 of the downstream rim rear conduit 30 and the streamline of the wash water that circulates on the rim conduit 20 in the left rear region of the bowl 8 Since the direction of A3 is substantially coincident, the washing water flowing out from the downstream rim conduit outlet 30b flows on the rim water passage 20 in substantially the same turning direction (circumferential direction). Thus, it is possible to form a flow that tries to go around the rim water passage 20 in a state where the momentum is maintained (a state in which the flow rate and the flow velocity are substantially maintained).
Therefore, the wash water that merges from the downstream rim rear water guide channel 30 to the rim water channel 20 flows on the rim water channel 20 in a turning direction opposite to the mainstream direction on the rim water channel, and the slit opening. It can suppress flowing down from the part 26 to the filth receiving surface 16.

  In the region where the downstream rim rear water conduit 30 and the rim water conduit 20 are connected, the outer wall surface 30c of the downstream rim rear water conduit 30 and the rim water channel outer wall surface 34 of the rim portion 18 are substantially flat. It is formed continuously. The outer wall surface 30c and the rim water passage outer wall surface 34 are formed flush with each other in the vicinity of the connecting portion. In other words, the tangential direction of the rim water passage outer wall surface 34 coincides with the direction in which the outer wall surface 30c extends. Accordingly, the cleaning water can smoothly flow along a flat surface extending linearly from the outer wall surface 30c of the downstream rim rear water guide channel 30 to the rim water channel outer wall surface 34 of the rim portion 18, and these outer wall surfaces The pressure loss of the flow flowing along can be suppressed.

  The toilet body 2 has an attachment portion 36 for attaching a toilet seat on the toilet body 2. The attachment portion 36 is provided at a position near the left and right sides behind the rim water passage 20 of the toilet body 2. Since the attachment portion 36 forms an attachment structure toward the inside of the toilet body 2, the downstream rim rear water conduit 30 cannot be formed at a position where the attachment portion 36 is formed. The downstream rim rear water guide channel 30 is formed between the left and right mounting portions 36 and can be provided to avoid the mounting portions 36, and further, can form a relatively long channel. ing.

Next, the operation (operation) of the flush toilet according to the first embodiment of the present invention will be described with reference to FIGS.
First, when an operation button (not shown) of a cleaning operation panel (not shown) for toilet flushing is operated, a drain valve (not shown) provided in the water storage tank 4 is opened, and a predetermined value is drawn from the water storage tank 4. Is supplied from the supply port 6 on the rear side of the toilet body 2 to the rim rear water conduit 10.
Next, the wash water flowing into the rim rear water conduit 10 flows in the upstream rim rear water conduit 28 toward the right side in the left-right direction of the toilet body 2. That is, the washing water flows toward the right side so as to move away from the central axis C. When the cleaning water reaches the upstream rim conduit outlet portion 28 a, the cleaning water changes its direction at the bent portion 32. Specifically, the direction of the wash water is changed from the rightward flow of the toilet body 2 to the leftward flow.

Subsequently, the washing water flows into the downstream rim rear water guide channel 30 extending toward the left front side on the opposite side. The washing water forms a linear flow from the downstream rim conduit guide portion 30a toward the downstream rim guide conduit outlet portion 30b along the linearly extending downstream rim rear guide conduit 30.
The downstream rim rear water conduit 30 is formed to be relatively longer than before, and the washing water flows linearly over a length L of a predetermined distance from the downstream rim conduit inlet portion 30a beyond the central axis C. The flow direction is relatively uniform while maintaining the water flow. Therefore, the wash water is prevented from spreading left and right from the downstream rim conduit outlet portion 30b, and can flow linearly along the central axis A2.

The wash water flowing out from the downstream side rim conduit outlet 30b flows along the rim water passage 20 along the flow line A3 of the wash water that tries to go around the rim water passage 20. The flow rate per unit time toward the swirling direction of the washing water is increased. A lot of washing water passes over the rim water passage bottom surface 24 in the rim water passage 20 from the left rear region in order of the left region, the front region, the right region, the right rear region, and the rear region, and again into the left rear region. A swirling flow is formed to return.
While forming such a swirl flow, the washing water gradually flows down from the slit opening 26 formed inside the rim water passage bottom surface 24, and the entire dirt receiving surface 16 of the bowl portion 8 is uniformly washed. Will be. The washing water flowing down the bowl portion 8 is discharged from the drain trap pipe 14 together with the filth, and a series of washing operations of the toilet body 2 is completed.

According to the flush toilet 1 according to the first embodiment of the present invention described above, the wash water changes its direction from the upstream rim rear water conduit 28 extending to one side in the left-right direction of the toilet body 2 and changes the downstream side. It flows into the rim rear water conduit 30 and is guided along the downstream rim rear water conduit 30 to the other side in the left-right direction over a relatively long length.
Accordingly, the momentum of the cleaning water flowing from the downstream rim rear water guide channel 30 toward the rim water channel 20 is increased, and the rim water channel 20 is swung even when the size of the slit opening 26 is not reduced. The flow to be attempted is easily formed. Accordingly, it is possible to increase the momentum of the washing water that is going to turn the rim water passage 20. Therefore, even when the amount of washing water used for toilet flushing is set to be small, the washing water can be swung around the rim water passage 20 and the bowl portion 8 can be sufficiently washed.

  Further, according to the flush toilet 1 according to the present embodiment, the downstream rim rear water conduit 30 is formed in a substantially straight line at a predetermined distance, so the direction is changed from the upstream rim rear water conduit 28. Wash water can be rectified in the downstream rim rear conduit 30. Therefore, the momentum of the washing water when flowing from the downstream side rim rear water guide channel 30 toward the rim water channel 20 is strengthened, and a flow for turning the rim water channel 20 is easily formed.

  Furthermore, according to the flush toilet 1 according to the present embodiment, the downstream rim rear water guide channel 30 can be provided avoiding the attachment portion 36 for attaching the toilet seat on the toilet body 2.

  Further, according to the flush toilet 1 according to the present embodiment, the outer wall surface 30c of the downstream rim rear water guide channel 30 and the rim water channel outer wall surface 34 are formed to be substantially flat and continuous. The pressure loss received by the wash water flowing from the rear water guide channel 30 to the rim water channel 20 can be suppressed.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a plan view showing a flush toilet according to the second embodiment of the present invention. Regarding the second embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

A flush toilet 101 according to the second embodiment of the present invention has a toilet main body 102 made of ceramic or the like.
To the upper edge of the bowl portion 8 of the toilet main body 102, flush water supplied from a rim portion 118 overhanging on the inside and a rim rear water conduit 110 formed on the rear side of the toilet main body 102 is discharged. A first water outlet 138 and a second water outlet 140 are formed.
In the second embodiment, the rim portion is a rim portion 118 of a borderless type (or a type having a relatively small margin) unlike the open rim type.
The wash water discharged from the first water outlet 138 flows on the rim water passage bottom surface 124 of the rim water passage 120 to be described later and swivels on the upper portion of the bowl portion 8, and receives filth from the rim water passage bottom surface 124 while turning. The bowl portion 8 is cleaned by descending to the surface 16. Further, the wash water discharged from the second water outlet 140 flows on the rim water passage bottom surface 124 of the rim water passage 120, which will be described later, swivels on the upper portion of the bowl portion 8, and sewage from the rim water passage bottom surface 124 while turning. The bowl portion 8 is cleaned by descending to the receiving surface 16.
In the present embodiment, the rim portion 118 is overhanging inward, but the present invention is not limited to such a form. For example, a vertical wall in which the rim portion does not overhang inward. It may have a shape.

  The rim portion 118 is formed on almost the entire circumference or most of the upper edge of the bowl portion 8 so as to guide cleaning water. The rim portion 118 is located above the filth receiving surface 16 and is formed such that the upper portion of the inner wall surface (the rim water passage outer wall surface 134 described later) protrudes inward. Further, the rim portion 118 is formed such that the rim water passage bottom surface 124 of the rim portion 118 extends inward in the horizontal direction. Therefore, the rim portion 118 forms the rim water passage 120 on the rim water passage bottom surface 124. The inner side and the lower side of the rim water passage 120 formed along the circumferential direction of the rim portion 118 are opened over the entire circumference, and the filth receiving surface 16 of the bowl portion 8 is formed.

  The rim water passage bottom surface 124 forms a shelf-like rim water passage bottom surface 124 formed over substantially the entire circumference of the bowl portion 8. The rim water passage bottom surface 124 forms a flat surface formed in an annular shape at the top of the bowl portion 8, and this flat surface is formed substantially horizontally from the outside direction to the inside direction of the bowl portion 8. With such a configuration, it is possible to form a flow in which the cleaning water supplied from the rim rear conduit 110 flows around the upper portion of the bowl portion 8 while flowing on the rim water passage bottom surface 124 in the rim water passage 120. .

  The rim rear water guide passage 110 is formed between the supply port 6 and the first water discharge port 138 and the second water discharge port 140, and the toilet body 2 from the vicinity of the supply port 6 disposed substantially at the center when viewed from the front of the toilet body. The upstream rim rear water conduit 28 extending to one side in the left-right direction and the downstream rim rear water conduit 130 extending from the upstream rim rear water conduit 28 to the other side in the left-right direction are provided. Since the downstream rim rear water conduit 130 in the second embodiment of the present invention basically has the same structure and function as the downstream rim rear water conduit 30 in the first embodiment of the present invention, the same. Although the description of the portion is omitted, the downstream rim conduit outlet portion is formed by the first outlet 138, and the downstream branch conduit 142 branched from a part of the downstream side of the downstream rim rear conduit 130 is the first. It differs from the downstream rim rear water guide channel 30 in the first embodiment of the present invention in that it extends to the two water discharge ports 140. The downstream branch conduit 142 is formed so as to extend linearly again from the other side to the one side in the left-right direction of the toilet body 2, and is folded back in the vicinity of the terminal end thereof to reach the second water outlet 140. A water conduit is formed.

The downstream rim rear conduit 130 forms a relatively linear flow path that obliquely crosses the central axis C of the toilet body 2 from the downstream rim conduit entrance 130a to the first spout 138. Yes.
In the vicinity of the first water discharge port 138, the direction of the central axis A4 of the downstream rim rear water guide channel 130 and the direction of the flow line A5 of the cleaning water trying to circulate on the rim water channel 120 in the left region of the bowl portion 8 Therefore, the wash water flowing out from the first water discharge port 138 flows in the same turning direction on the rim water passage 120 and maintains the momentum of the water (the flow rate and flow velocity are reduced). It is possible to form a flow that tries to go around the rim water passage 120 in a substantially maintained state.
Further, in the vicinity of the second water outlet 140, the direction of the central axis A6 of the downstream branch conduit 142 and the direction of the flow line A7 of the cleaning water trying to circulate on the rim water passage 120 in the right rear region of the bowl portion 8 are shown. Therefore, the wash water flowing out from the second water outlet 140 flows in the substantially same turning direction on the rim water passage 120 and maintains the momentum of the water (flow rate and flow velocity). In a state in which the rim water passage 120 is maintained, a flow that tries to go around the rim water passage 120 can be formed.

Further, in the region where the downstream rim rear water conduit 130 and the rim water conduit 120 are connected, the outer wall surface 130c of the downstream rim rear water conduit 130 and the rim water channel outer wall surface 134 of the rim portion 118 are substantially the same. It is formed flat continuously. Accordingly, the cleaning water can smoothly flow along a flat surface that linearly extends from the outer wall surface 130 c of the downstream rim rear water conduit 130 to the rim water passage outer wall surface 134 of the rim portion 118.
In the region where the downstream branch conduit 142 and the rim conduit 120 are connected, the outer wall surface 142c of the downstream branch conduit 142 and the rim conduit outer wall surface 134 of the rim portion 118 are formed substantially continuously. Has been. Therefore, the cleaning water can smoothly flow along a flat surface that linearly extends from the outer wall surface 142 c of the downstream branch water conduit 142 to the rim water passage outer wall surface 134 of the rim portion 18.

Next, the operation (operation) of the flush toilet according to the second embodiment of the present invention will be described with reference to FIG.
In the second embodiment of the present invention, the wash water that has flowed into the rim rear water conduit 110 flows in the upstream rim rear water conduit 28 toward the right side in the left-right direction of the toilet body 102. That is, the washing water flows toward the right side so as to move away from the central axis C. When the cleaning water reaches the upstream rim conduit outlet portion 28 a, the cleaning water changes its direction at the bent portion 32. Specifically, the direction of the wash water is changed from the rightward flow of the toilet body 102 to the leftward flow.

Subsequently, the wash water flows into the downstream rim rear water guide passage 130 that extends toward the left front side on the opposite side. The washing water forms a linear flow from the downstream rim conduit inlet portion 130a toward the first water discharge port 138 along the downstream rim rear conduit channel 130 that extends linearly.
The downstream rim rear water conduit 130 is formed to be relatively longer than before, and the washing water flows linearly over a length L1 of a predetermined distance from the downstream rim conduit inlet portion 130a beyond the central axis C. The flow direction is relatively uniform while maintaining the water flow. Therefore, the wash water is prevented from spreading from the first water outlet 138 to the left and right, and can flow linearly from the central axis A4 to the central axis A5.
A part of the wash water branches from the downstream rim rear conduit 130 to the downstream branch conduit 142, flows linearly along the downstream branch conduit 142, and then flows from the second outlet 140 to the rim conduit. Water is discharged on the bottom surface 124.

The wash water flowing out from the first water outlet 138 flows through the rim water passage 120 along the flow line A5 of the wash water that is going to circulate on the rim water passage 120. The flow rate per unit time toward the swirling direction of the washing water is increased. The momentum of the washing water when flowing from the first water discharge port 138 toward the rim water passage 120 is strengthened, and even when a rim portion other than the open rim portion is employed, the rim water passage 120 tries to turn. A flow is easily formed.
Further, the wash water flowing out from the second water outlet 140 flows through the rim water passage 120 along the flow line A7 of the wash water that is going to go around the rim water passage 120. The flow rate per unit time toward the swirling direction of the washing water is increased. The momentum of the washing water when flowing into the rim water passage 120 from the second water outlet 140 is strengthened, and even if a rim portion other than the open rim portion is adopted, the rim water passage 120 tries to turn. A flow is easily formed.

  In this way, the washing water passes over the rim water passage bottom surface 124 in the rim water passage 120 from the left rear region in the order of the left region, the front region, the right region, the right rear region, and the rear region. A swirling flow is formed that returns to the rear region. While forming such a swirl flow, the wash water gradually flows down to the filth receiving surface 16 of the bowl portion 8 inside the rim water passage bottom surface 24, and the entire bowl portion 8 is washed uniformly. The washing water flowing down the bowl portion 8 is discharged from the drain trap pipe 14 together with the filth, and a series of washing operations of the toilet body 2 is completed.

According to the flush toilet 101 according to the second embodiment of the present invention described above, the wash water changes its direction from the upstream rim rear water conduit 28 extending to one side in the left-right direction of the toilet body 102 and changes the downstream side. It flows into the rim rear water conduit 130 and is guided along the downstream rim rear water conduit 130 to the other side in the left-right direction over a relatively long length.
Therefore, the momentum of the washing water when flowing from the downstream rim rear conduit 130 toward the rim water passage 120 via the first water outlet 138 is strengthened, and the rim portion 118 other than the open rim portion is employed. Even so, a flow that tends to turn the rim water passage 120 is likely to be formed. Accordingly, it is possible to increase the momentum of the washing water that is going to turn the rim water passage 120. Therefore, even when the amount of washing water used for toilet flushing is set to be small, the washing water can make a good turn in the rim water passage 120 and the bowl portion 8 can be sufficiently washed.

  Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a plan view showing a flush toilet according to the third embodiment of the present invention, and FIG. 6 is a schematic view showing a flow path at the rear upper part of the toilet body in the flush toilet according to the third embodiment of the present invention. It is an enlarged view. Regarding the third embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

A flush toilet 201 according to the third embodiment of the present invention has a toilet body 202 made of ceramic or the like.
The rear upper part of the toilet body 2 is formed between the supply port 6 and the rim water passage 20 and guides the wash water supplied from a water storage tank (not shown) from the supply port 6 to the bowl portion 8. A water conduit 210 is formed.
In the third embodiment, the shape of the bent portion 232 connecting the upstream rim rear conduit 28 and the downstream rim rear conduit 30 of the rim rear conduit 210 is the rim rear conduit 10 in the first embodiment. The shape of the bent portion 32 is different.

Next, the rim rear water conduit will be described in detail.
As shown in FIGS. 5 and 6, a supply port 6 to which a downstream end of a water storage tank (not shown) is connected is formed at the rear end of the rim rear water guide channel 210 on the rear side of the toilet body 202. The wash water supplied from the water storage tank (not shown) is discharged from the supply port 6 to the rim rear water conduit 210 on the rear side of the toilet body 202 and flows into the rim water conduit 20 from the rim rear water conduit 210. It has become.

  The rim rear water conduit 210 includes an upstream rim rear water conduit 28 extending from the vicinity of the supply port 6 disposed substantially in the center when viewed from the front of the toilet body 202 to one side in the left-right direction of the toilet body 202, and the upstream A downstream rim rear water conduit 30 extending from the side rim rear water conduit 28 to the other side in the left-right direction is provided. The rim rear water guide channel 210 forms a left-right asymmetric channel with respect to the central axis C. The rim rear water conduit 210 is formed in a “<” shape by the upstream rim rear water conduit 28 and the downstream rim rear water conduit 30 (for example, a boomerang shape or a shape like a dog's rear leg). ). A bent portion 232 connecting the upstream rim rear water conduit 28 and the downstream rim rear water conduit 30 extending in different directions is eccentrically positioned in the right region with respect to the central axis C in the front-rear direction of the toilet body 2. Yes. The bent portion 232 is formed of an upstream rim conduit outlet portion 28a and a downstream rim conduit inlet portion 30a described later. The downstream rim rear water guide channel 30 is formed so as to be decentered gradually toward the left region after returning from the upstream side toward the downstream side on the central axis C. Therefore, the rim rear water guide channel 210 is formed so that the length of the whole water guide channel is longer than the conventional one.

  The upstream rim rear water guide channel 28 extends linearly from the supply port 6 on the central axis C of the toilet body 2 obliquely in the right direction, and is disposed near the right side with respect to the central axis C. It extends to the water channel outlet 28a. The upstream rim rear water conduit 28 is not disposed at a position where both side walls of the flow path are symmetric with respect to the central axis C, but is disposed at an asymmetric position with respect to the central axis C. The upstream rim rear water guide channel 28 is formed so as to be gradually decentered to the right region with respect to the central axis C from the upstream toward the downstream. The central axis A1 of the upstream rim rear water guide channel 28 is disposed such that the front side is inclined rightward outward with respect to the central axis C.

As shown in FIGS. 5 and 6, the center point c <b> 1 of the supply port 6 is arranged on a central axis C that extends to the center of the toilet body 2 in the left-right direction. The upstream rim rear water conduit 28 is formed such that its central axis A1 is eccentric to the right side with respect to the central axis C of the toilet body 202. The central axis A1 of the upstream rim rear water guide channel 28 is located on the direction side where the bent portion 232 is arranged in the left-right direction of the toilet body 202 from the center point c1 of the supply port 6 (for example, in the left-right direction of the toilet body 202). It extends eccentrically to the right side of one side). That is, the central axis A1 of the upstream rim rear water guide channel 28 passes through the position a1 on the right side of the center point c1 in the left-right cross section at the position of the center point c1 of the supply port 6.
The central axis A1 of the upstream rim rear water conduit 28 extends eccentrically to the right with respect to the central axis C from the upstream rim rear water conduit inlet 228b to the upstream rim water conduit outlet 28a. An imaginary straight line obtained by extending the center axis A1 intersects the center axis C and the rear side of the center point c1 of the supply port 6.

  The upstream rim rear water conduit inlet portion 228b of the upstream rim rear water conduit 28 is shifted to one side (right side) with respect to the central axis C passing through the center point c1 in the outer peripheral wall surface 206a of the substantially circular supply port 6. Connected to the supply port 6. In other words, the upstream rim rear water guide channel inlet 228 b is mainly connected to a portion of the outer periphery of the supply port 6 on the side where the upstream rim rear water guide channel 28 tends to be eccentric with respect to the central axis C. In other words, most of the upstream rim rear water guide channel entrance 228b is arranged to be deviated to the left and right sides with respect to the central axis C.

The upstream rim rear water conduit outer wall surface 228 c of the upstream rim rear water conduit 28 is connected to the wall surface 206 a of the supply port 6 along the tangent line 11 (virtual tangent line 11) of the outer wall surface 206 a of the supply port 6. ing. The upstream rim rear water guide channel outer wall surface 228c is at a tangent line 11 (virtual tangent line 11 on the wall surface 206a) perpendicular to the radius r3 of the supply port 6 at a predetermined position 206b on the outer wall surface 206a of the supply port 6. The wall surface 206a extends smoothly along the circular arc having a radius r3 and is smoothly connected. Therefore, the wall surface connecting from the wall surface 206a forming the inner surface of the supply port 6 to the upstream rim rear water guide channel outer wall surface 228c is smoothly continuous without forming a connection portion protruding toward the inner side of the channel. The wall surface of the flow path is formed.
Therefore, the wash water supplied from the supply port 6 flows along the upstream rim rear water guide channel outer wall surface 228c from the wall surface 206a of the supply port 6 along the tangent line 11 of the wall surface 206a, and the momentum is not weakened as much as possible. It can flow smoothly while doing so. Therefore, the momentum of the washing water flowing through the upstream rim rear water guide channel 28 can be relatively increased.
In addition, a virtual tangent line 11 at the connection portion between the wall surface 206a and the upstream rim rear waterway outer wall surface 228c extends parallel to the central axis A1 and has an inclination that spreads outward toward the front side of the toilet body 202. Have.

The bent portion 232 is located between the upstream rim conduit outlet portion 28 a at the downstream end of the upstream rim rear conduit 28 and the downstream rim conduit inlet portion 30 a at the upstream end of the downstream rim rear conduit 30. It is formed as a channel that bends. The bent portion 232 includes an outer peripheral wall portion 232a formed outside the flow path of the bent portion 232 (outside the toilet body 2), and an inner side formed inside the flow path of the bent portion 232 (inside the toilet body 2). A peripheral wall portion 232b.
The outer peripheral wall portion 232a forms an arcuate wall surface that curves relatively abruptly, and the inner peripheral wall portion 232b forms an arcuate wall surface that curves relatively gently. Here, the radius r1 of the arc of the outer peripheral wall portion 232a is formed to be smaller than the radius r2 of the arc of the inner peripheral wall portion 232b. That is, the curvature radius R1 of the outer peripheral wall portion 232a is formed to be larger than the curvature radius R2 of the inner peripheral wall portion 232b.

  In the bent portion 232, the ratio of the size of the radius r1 of the outer peripheral wall portion 232a and the radius r2 of the inner peripheral wall portion 232b is set within a ratio range from a ratio of 1: 2 to a ratio of 4: 5. . For example, the ratio of the size of the radius r1 of the outer peripheral wall portion 232a and the radius r2 of the inner peripheral wall portion 232b is set to a ratio of 3: 4.

  In addition, the bent portion 232 is formed such that the radius r1 of the outer peripheral wall portion 232a is smaller than the radius r2 of the inner peripheral wall portion 232b, so that the width W between the outer peripheral wall portion 232a and the inner peripheral wall portion 232b is It is formed so as to increase from the inlet portion W1 to the central portion W2 and to decrease from the central portion W2 to the outlet portion W3. The width W is reduced from the central portion W2 to the outlet portion W3, and the downstream end portion 232c of the outer peripheral wall portion 232a is formed so as to be slightly directed toward the outer wall surface 30c of the downstream rim rear water guide channel 30. In this way, the flow along the outer peripheral wall portion 232a of the flow path of the bent portion 232 is along the inner peripheral wall portion 232b side of the flow path of the bent portion 232 (or the outer wall surface 30c side of the downstream rim rear water conduit 30). Can be directed towards the flow.

  The downstream rim rear water conduit 30 extends from the downstream rim water conduit inlet 30 a connected to the bent portion 232 to the left front and is connected to the left rear region 20 a of the rim water conduit 20. A flow path reaching the portion 30b is formed. The downstream rim rear conduit 30 forms a linear flow path that obliquely crosses the central axis C of the toilet body 2 from the downstream rim conduit entrance 30a to the downstream rim conduit exit 30b. ing. The connection region between the downstream rim rear water guide channel 30 and the rim water channel 20 includes a region of the central axis C and a region near the central axis C. The central axis A2 of the downstream rim rear water guide channel 30 is disposed such that the front side is inclined leftward outward with respect to the central axis C. The intersection of the central axis A1 of the upstream rim rear conduit 28 and the central axis A2 of the downstream rim rear conduit 30 is located on the right side with respect to the central axis C, whereas the downstream rim conduit outlet portion 30 b is located on the left side opposite to the central axis C. The angle formed by the central axis A1 and the central axis C is arranged to be smaller than the angle formed by the central axis A2 and the central axis C.

Similarly to the flush toilet 1 according to the first embodiment and the flush toilet 101 according to the second embodiment, the flush toilet 201 according to the third embodiment also relates to the left and right asymmetric rim rear conduits as described above. You may form the flow path of the reverse shape. More specifically, from the upstream rim rear waterway that extends to the left side of the toilet body in the left-right direction, the direction is changed to the right and flows into the downstream rim rear waterway, along the downstream rim rear waterway. The rim water passage 20 may be configured so as to form a one-way flow in which the wash water circulates clockwise in the left-right direction over a relatively long length.
Moreover, you may apply the bending part 232 of the flush toilet 201 by 3rd Embodiment to the bending part 32 of the flush toilet 101 by 2nd Embodiment.

Next, the operation (operation) of the flush toilet according to the third embodiment of the present invention will be described with reference to FIGS. Regarding the description of the action (operation) of the third embodiment, the action in the rim rear water conduit having a structure different from that of the above-described first embodiment will be mainly described, and the description of those actions will be given to the parts of other similar structures. Is omitted.
The washing water supplied from the water storage tank (not shown) to the supply port 6 once spreads outward toward the wall surface 206a of the supply port 6 as shown by the arrow F1, and the flow is supplied as shown by the arrow F2. It flows along the wall surface 206a of the mouth 6. The flow that flows along the wall surface 206a flows smoothly along the wall surface from the wall surface 206a to the upstream rim rear water guide channel outer wall surface 228c, as indicated by an arrow F3. Since the upstream rim rear water conduit outer wall surface 228c is connected in the tangential direction of the wall surface 206a on the side where the upstream rim rear water conduit 28 is eccentric in the left-right direction, the upstream rim rear side from the eccentric side of the supply port 6 is provided. A relatively linear flow path can be formed up to the outlet 28a of the water conduit 28, and the disturbance of the washing water can be reduced. Further, it is possible to make the momentum of the washing water flowing out of the region on the eccentric side with respect to the eccentric upstream rim rear water guide channel 28 relatively strong. Further, the upstream rim rear water conduit outer wall surface 228c is connected in the tangential direction of the wall surface 206a, and the wall surface connected from the wall surface 206a to the upstream rim rear water conduit outer wall surface 228c is the inner side of the flow path of the upstream rim rear water conduit 28. Is not formed so that the flow along the wall surface 206a is disturbed inward when flowing into the upstream rim rear water guide channel inlet 228b. As shown by arrows F3 and F4, it can flow along the outer wall surface 228c of the rim rear conduit.

As shown by arrows F4, F5, and F6, the wash water that has flowed into the rim rear water conduit 10 passes through the upstream rim rear water conduit 28 along the direction of the rim rear water conduit 10 in the left-right direction of the toilet body 2. It flows toward the right side. The washing water changes the flow direction at the bent portion 232.
On the inner peripheral side of the bent portion 232, the cleaning water flows while bending along the inner peripheral wall portion 232b having a relatively large radius r2, as indicated by an arrow F7. The wash water flows along the outer wall surface 30c on the downstream side of the inner peripheral wall portion 232b, merges with a water flow F9 as described later, and downstream from the inner peripheral wall portion 232b side as indicated by arrows F11 and F12. It flows toward the rim water passage 20 along the opposite (left) outer wall surface 30c extending to the side rim rear water guide passage 30.

  On the outer peripheral side of the bent portion 232, as shown by the arrow F8, the cleaning water changes its direction along the outer peripheral wall portion 232a having a relatively small radius r1, and flows inward so as to bounce off. At this time, since the radius r1 of the arc of the outer peripheral wall portion 232a is formed to be smaller than the radius r2 of the arc of the inner peripheral wall portion 232b, the main flow of washing water whose direction is changed along the outer peripheral wall portion 232a However, it flows in the direction of the outer wall surface 30c of the downstream rim rear water guide channel 30 as indicated by an arrow F9. Since the radius r1 of the arc of the outer peripheral wall portion 232a is formed to be relatively small, the main flow of the cleaning water flowing along the outer peripheral wall portion 232a is separated from the wall surface of the downstream end portion 232c toward the outer wall surface 30c. Can be oriented as follows. Furthermore, the ratio of the flow F10 that flows along the downstream wall surface of the outer peripheral wall portion 232a can be relatively suppressed, and the flows F11 and F12 that flow along the outer wall surface 30c of the downstream rim rear water guide channel 30 are reduced. As the main flow, the momentum of the cleaning water flowing toward the rim water passage 20 can be formed relatively strong. As shown by arrows F11 and F12, the washing water is linear from the downstream rim conduit guide portion 30a toward the downstream rim guide conduit outlet portion 30b along the downstream rim rear guide conduit 30 that extends linearly. Form a flow. Therefore, as described above, a flow for turning the rim water passage 20 is easily formed.

The wash water flowing out from the downstream side rim waterway outlet 30b flows through the rim water passage 20 along the flow line of the wash water that is going to circulate on the rim water passage 20 as indicated by an arrow F13. The flow rate per unit time toward the swirling direction of the washing water is increased. A lot of washing water passes over the rim water passage bottom surface 24 in the rim water passage 20 from the left rear region in order of the left region, the front region, the right region, the right rear region, and the rear region, and again into the left rear region. A swirling flow is formed to return.
While forming such a swirl flow, the wash water gradually flows down from the slit opening 26 formed on the inner side of the rim water passage bottom surface 24, and as shown by the arrow F14, the filth receiving surface of the bowl portion 8 The whole 16 is washed uniformly. The washing water flowing down the bowl portion 8 is discharged from the drain trap pipe 14 together with the filth, and a series of washing operations of the toilet body 2 is completed.

According to the flush toilet 201 according to the above-described third embodiment of the present invention, the wash water changes its direction from the upstream rim rear water conduit 28 that extends to one side in the left-right direction of the toilet body 202 and changes the downstream side. It flows into the rim rear water conduit 30 and is guided along the downstream rim rear water conduit 30 to the other side in the left-right direction over a relatively long length.
Accordingly, the momentum of the cleaning water flowing from the downstream rim rear water guide channel 30 toward the rim water channel 20 is increased, and the rim water channel 20 is swung even when the size of the slit opening 26 is not reduced. The flow to be attempted is easily formed. Accordingly, it is possible to increase the momentum of the washing water that is going to turn the rim water passage 20. Accordingly, even when the amount of washing water used for toilet flushing is set to be small, as shown by the arrow F13, the washing water can be swung around the rim water passage 20, and as shown by the arrow F14, the bowl can be swung. The part 8 can be sufficiently cleaned.

  Moreover, according to the flush toilet 201 according to the third embodiment of the present invention, the central axis A1 of the upstream rim rear water guide channel 28 extending from the supply port 6 to one side in the left-right direction of the toilet body 202 is provided at the supply port. 6, the wash water flowing out from the supply port 6 is upstream of the center of the supply port 6 in the left-right direction. From the direction in which the side rim rear water guide channel 28 extends, it can flow out relatively smoothly to the eccentric upstream rim rear water guide channel 28. Therefore, compared with the case where the central axis A1 of the upstream rim rear water conduit 28 is not eccentric from the center of the supply port 6, the cleaning water is compared from the upstream rim rear water conduit 28 side where the supply port 6 is eccentric. It is possible to flow into the upstream rim rear water guide channel 28 smoothly.

  In addition, according to the flush toilet 201 according to the third embodiment of the present invention, the washing water supplied from the supply port 6 is located behind the upstream rim so that the wall 206a of the supply port 6 extends along the tangent l1 of the wall surface 206a. The water flows along the upstream rim rear water conduit outer wall surface 228c of the water conduit 28, and can flow smoothly while maintaining its momentum. Therefore, the momentum of the washing water flowing through the upstream rim rear water guide channel 28 can be relatively increased.

  Further, according to the flush toilet 201 according to the third embodiment of the present invention, the radius of the arc of the outer peripheral wall portion 232a of the flow path of the bent portion 232 is smaller than the radius of the arc of the inner peripheral wall portion 232b of the flow path. The flow along the outer peripheral wall portion 232a of the flow path of the bent portion 232 can be guided toward the flow along the inner peripheral wall portion 232b side of the flow path of the bent portion 232, and the downstream side from the inner peripheral wall portion 232b side. The momentum of the washing water flowing toward the rim water passage 20 along the wall surface extending to the rim rear water guide passage 30 is strengthened, and a flow for turning the rim water passage 20 is easily formed.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 4 Reservoir tank 6 Supply port 8 Bowl part 10 Rim rear conduit 12 Reservoir part 14 Drain trap pipe 14a Inlet 14b Rear end 16 Soil receiving surface 18 Rim part 20 Rim passage 20a Left rear area 22 Rim hanging wall portion 24 Rim conduit bottom surface 26 Slit opening 28 Upstream rim rear conduit 28a Upstream rim conduit outlet 30 Downstream rim rear conduit 30a Downstream rim conduit inlet 30b Downstream rim conduit Outlet portion 30c Outer wall surface 32 Bent portion 34 Rim water passage outer wall surface 36 Mounting portion 101 Flush toilet 102 Toilet body 110 Rim rear water conduit 118 Rim portion 120 Rim water passage 124 Rim water passage bottom surface 130 Downstream rim rear water conduit 130a Downstream Side rim conduit inlet portion 130c outer wall surface 134 rim water channel outer wall surface 138 first water outlet 140 second water discharge 142 downstream branch conduit 142c outer wall 201 flush toilet 202 toilet body 206 rim conduit 206a wall 206b predetermined position 210 rim rear conduit 228b upstream rim rear conduit inlet 228c upstream rim rear conduit outer wall 232 bent portion 232a Outer peripheral wall portion 232b Inner peripheral wall portion 232c Downstream end portion 301 Flush toilet bowl 302 Toilet body 304 Rim 306 Rim water passage 308 Bowl portion 310 Water conduit 312 Slit opening a1 Position A1 Center axis A2 Center axis A3 Stream line A4 Center axis A5 Center axis A5 Stream line A6 Center axis A7 Stream line C Center axis c1 Center point l1 Tangent R1 Curvature radius R2 Curvature radius r1 Radius r2 Radius r3 Radius W Width W1 Entrance part W2 Center part W3 Exit part

Claims (8)

In flush toilets that wash the toilet bowl body with wash water,
A water supply device for supplying cleaning water to the supply port of the toilet body,
A bowl-shaped filth receiving surface, a rim portion at the upper edge, a rim water passage that is formed on the entire circumference of the rim portion and guides cleaning water, and is formed over the entire circumference to the lower side of the rim water passage. A bowl portion provided with the water discharge portion, which is a slit opening,
A drainage channel whose inlet is connected to the lower part of the bowl part to discharge filth,
A rim rear water conduit formed between the supply port and the rim water conduit;
The rear rim waterway is an upstream rim waterway extending from the supply port to one side in the left-right direction of the toilet body, and a downstream side extending from the upstream rim waterway to the other side in the left-right direction. A flush toilet comprising a rim conduit.   The flush toilet according to claim 1, wherein the downstream rim conduit is formed substantially linearly at a predetermined distance.   The flush toilet according to claim 1 or 2, wherein the downstream rim conduit is formed between attachment portions for attaching a toilet seat on the toilet body.   The flush toilet according to any one of claims 1 to 3, wherein an outer wall surface of the downstream rim water conduit and an outer wall surface of the rim water channel are continuously formed substantially flat.   5. The center axis of the upstream rim water conduit extends eccentrically from the center of the supply port toward the side in which the upstream rim water conduit extends in the left-right direction. 6. Flush toilet.   The flush toilet according to any one of claims 1 to 5, wherein an outer wall surface of the upstream rim conduit is connected to the wall surface of the supply port along a tangent line of the wall surface of the supply port.   The bent portion formed between the outlet portion of the upstream rim conduit and the inlet portion of the downstream rim conduit has an arc radius of the outer peripheral wall of the channel, and an arc of the inner peripheral wall of the channel. The flush toilet of any one of Claims 1 thru | or 6 currently formed smaller than the radius of this. In flush toilets that wash the toilet bowl body with wash water,
A water supply device for supplying cleaning water to the supply port of the toilet body,
A bowl-shaped filth receiving surface, a rim portion at the upper edge, a rim water passage formed on the inner periphery of the rim portion to guide the washing water, and an opening on the rim water passage for cleaning water into the bowl portion. A water discharge part for discharging water, and the bowl part comprising:
A drainage channel whose inlet is connected to the lower part of the bowl part to discharge filth,
A rim rear water conduit formed between the supply port and the water discharge part,
The rear rim waterway is an upstream rim waterway extending from the supply port to one side in the left-right direction of the toilet body, and a downstream side extending from the upstream rim waterway to the other side in the left-right direction. A flush toilet comprising a rim conduit.

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