JP6824514B2 - Flush toilet - Google Patents

Description

The present invention relates to a flush toilet, and in particular, extends to a bowl portion that receives filth and a drainage port that is connected to the lower part of the bowl portion and is connected to the entrance of an external drainage pipe, and collects sealed water in a part thereof. With respect to a flush toilet having a drainage channel.

If the drainage discharged from the toilet bowl flows into the drainage port at once, the inside of the drain trap pipeline or the drainage pipe may become temporarily full, causing a self-siphon action that draws the water on the upstream side to the downstream side. is there. When this self-siphon action occurs, the sealing water in the toilet bowl body is drawn to the downstream side and discharged, which may cause the sealing water to break.

In order to prevent such a self-siphon action, for example, a flush toilet as described in Patent Document 1 and Patent Document 2 has been proposed. Patent Document 1 describes a flush toilet provided with a drain socket for connecting a drain port of the toilet body and a drain pipe arranged on the floor surface. The drainage socket of this flush toilet is provided with a diversion section at its inflow section, and the inflowing drainage collides with the diversion section to be diverted in the vertical direction, and the drainage diverted upward is swirled in the swirling space. , The maximum instantaneous flow rate of drainage discharged from the drainage socket to the drainage pipe is reduced, and the occurrence of self-siphon action in the drainage pipe is suppressed.

Further, Patent Document 2 describes a flush toilet provided with a drain trap pipeline. The drain trap pipeline of this flush toilet is provided with a descending pipeline, and this descending pipeline has an enlarged portion in which the cross-sectional area of the flow path is gradually expanded and a flow path cross section provided on the downstream side of the expanded portion is reduced. A water receiving portion is provided between the reduced portion and the enlarged portion and the reduced portion, and a recessed portion is formed by the enlarged portion and the water receiving portion. In this flush toilet, the recessed portion delays the flow velocity of the washing water flowing through the descending pipe to suppress the generation of self-siphon.

Japanese Unexamined Patent Publication No. 2016-176255 JP-A-2017-317772

As described above, various structures for suppressing the occurrence of self-siphon action have been proposed, but there is a demand for the development of flush toilets with these structures improved.

Therefore, the present invention has been made to satisfy conventional demands, and provides a flush toilet that can suppress the occurrence of self-siphon action and surely prevent the sealed water from being drawn to the downstream side. It is intended to be provided.

In order to achieve the above object, the present invention extends to a bowl portion that receives filth and a drainage port connected to the lower part of the bowl portion and connected to the entrance of an external drainage pipe, and seals a part thereof. In a flush toilet having a drainage flow path for collecting, the drainage flow path includes an ascending flow path that rises from the lower part of the bowl portion to the rear and a descending flow path that descends from the downstream end of the ascending flow path to the drainage port. The descending flow path of the drainage channel is provided with a bottom surface on the rear side of the drainage port, and on the front side thereof, the upper end thereof is integrally formed with the top bottom surface of the ascending flow path and from the upper end thereof. An inclined surface that inclines downward toward the lower end is formed, and a recess is formed from the bottom surface of the top of the ascending flow path of the drainage flow path to at least the upstream side of the inclined surface of the descending flow path .
In the present invention configured in this way, a part of the drainage flowing on the bottom surface of the top of the ascending channel of the drainage channel becomes an inclined surface of the descending channel due to the Coanda effect (a phenomenon in which the jet is bent along the solid wall). It flows along and flows from the front side of the drainage port toward the rear side to the drainage port, while the rest of the drainage flows along the bottom surface of the descending flow path and flows into the drainage port from the rear side to the front side. .. As a result, according to the present invention, the flow direction of the drainage flowing into the drainage port can be dispersed from the front side and the rear side at least, so that self-siphon is generated in the drainage flow path and the drainage pipe. Can be suppressed. Therefore, according to the present invention, it is possible to prevent the flush toilet from being drawn to the downstream side.
Further, in the flush toilet of the present invention configured as described above, since a recess is formed from the bottom surface of the top of the ascending flow path of the drainage flow path to at least the upstream side of the inclined surface of the descending flow path, a flat surface is formed. Compared with the case, the contact area in contact with the drainage is larger on the inclined surface of the descending flow path. As a result, the Coanda effect is likely to occur from the bottom surface of the top of the ascending flow path to the inclined surface of the descending flow path, so that the amount of drainage flowing along the inclined surface increases, and the drainage flows in the descending flow path of the drainage flow path. The flow direction of the drainage flowing into the mouth can be more dispersed.

In the present invention, preferably, the drainage flow path is provided with left and right side surfaces, and each of these left and right side surfaces is substantially in the vertical direction from the left and right side portions of the top bottom surface of the ascending flow path to the left and right side portions of the descending flow path. It is formed so as to extend vertically.
In the present invention configured in this way, the left and right side surfaces of the drainage channel extend substantially vertically in the vertical direction from the left and right sides of the top bottom surface of the ascending channel to the left and right sides of the descending channel, respectively. Due to the coranda effect, it becomes easier to form a flow along the left and right sides of the drainage channel, so that the distance of drainage flowing on the left and right sides differs from the distance of drainage flowing on the inclined surface. Since the timing of flowing into the drainage port is different, the drainage flowing into the drainage port can be dispersed in time.

In the present invention, preferably, the inclined surface of the descending flow path includes an upstream inclined surface and a downstream inclined surface, and the radius of curvature of the surface connecting the downstream inclined surface and the left and right side surfaces is the upstream inclined surface and the left and right side surfaces. It is larger than the radius of curvature of the connecting surface.
In the present invention configured as described above, since the radius of curvature of the surface connecting the downstream inclined surface and the left and right side surfaces is larger than the radius of curvature of the surface connecting the upstream side inclined surface and the left and right side surfaces, the coranda on the downstream side inclined surface The effect is weakened, and part of the drainage that flows along the downstream slope flows down along the left and right sides. Therefore, according to the present invention, the flow direction of the drainage flowing into the drainage port can be more dispersed.

In the present invention, a front bottom surface is preferably formed between the lower end of the inclined surface of the descending flow path of the drainage flow path and the front end of the drainage port.
In the present invention configured as described above, the drainage that has flowed to the lower end along the inclined surface of the descending flow path of the drainage channel flows from the front bottom surface in front of the drainage port to the drainage port rearward. It is possible to suppress the generation of a large amount of drainage flow along the front end of the drainage pipe that occurs when the drainage flows from the bottom surface toward the front into the drainage port. Thereby, according to the present invention, it is possible to suppress the generation of self-siphon in the drainage pipe.

In the present invention, preferably, the descending flow path is a descending bottom surface that inclines backward from the top of the ascending flow path, and is either the bottom surface of the descending flow path or an upper region thereof. A connecting surface that connects the descending bottom surface extending toward the region, the lower end of the descending bottom surface, and the upper end of the inclined surface of the descending flow path, and the radius of curvature of the connecting surface in the vertical cross section in the front-rear direction. Includes the connecting surface, which is smaller than the radius of curvature of the descending bottom surface.
In the present invention configured as described above, the flow of the washing water can be formed toward any one of the bottom surface of the descending flow path and the upper region thereof by the descending bottom surface of the descending flow path. Further, since the radius of curvature of the connecting surface of the descending flow path is smaller than the radius of curvature of the descending bottom surface, the flow of the washing water directed to the region on the bottom surface side by the descending bottom surface can be easily separated from the connecting surface by the connecting surface. Can be done. As a result, according to the present invention, it is possible to easily separate the washing water flowing from the descending bottom surface along the connecting surface toward the upper region of the bottom surface and the like, and a large amount of washing water flows from the connecting surface along the inclined surface. By becoming too much, it is possible to suppress the generation of self-siphon in the drainage channel and the drainage pipe.

In the present invention, preferably, the descending flow path is a descending bottom surface that inclines backward from the top of the ascending flow path, and is either the bottom surface of the descending flow path or an upper region thereof. A connecting surface that connects the descending bottom surface extending toward the region, the lower end of the descending bottom surface, and the upper end of the inclined surface of the descending flow path, and the curvature of the connecting surface in the vertical cross section in the front-rear direction. With the connecting surface having a radius smaller than the radius of curvature of the descending bottom surface, the width of the descending flow path in the front-rear direction from the front end to the rear end of the connecting surface is from the front end to the rear end of the descending bottom surface. It is smaller than the width in the front-back direction of.
According to the present invention configured as described above, the width in the front-rear direction from the front end to the rear end of the connecting surface of the descending flow path is smaller than the width in the front-rear direction from the front end to the rear end of the descending bottom surface. , It is difficult for the washing water to follow the connecting surface, and the washing water flowing from the descending bottom surface along the connecting surface can be more easily separated toward the upper region of the bottom surface and the like. Therefore, it is possible to further suppress the generation of self-siphon in the drainage flow path and the drainage pipe due to the excessive amount of washing water flowing from the connecting surface along the inclined surface.

In the present invention, preferably, the descending flow path is a descending bottom surface that inclines rearward from the top of the ascending flow path, and is any of the bottom surface of the descending flow path and an upper region thereof. A connecting surface that connects the descending bottom surface extending toward the region, the lower end of the descending bottom surface, and the upper end of the inclined surface of the descending flow path, and the curvature of the connecting surface in the vertical cross section in the front-rear direction. A connecting surface having a radius smaller than the radius of curvature of the descending bottom surface is provided, and the rear end of the connecting surface of the descending flow path is located behind the central axis of the drainage port.
According to the present invention configured in this way, the washing water separated from the connecting surface of the descending flow path easily lands on the bottom surface on the rear side of the drain port. As a result, the flow direction of the washing water flowing into the drain port can be more reliably dispersed at least from the front side and from the bottom surface on the rear side, and the occurrence of self-siphon in the drain flow path and the drain pipe is suppressed. can do.

In the present invention, preferably, the descending flow path is a descending bottom surface that inclines rearward from the top of the ascending flow path, and is either the bottom surface of the descending flow path or an upper region thereof. The radius of curvature of the connecting surface having the descending bottom surface extending toward the region and connecting the descending bottom surface and the side wall of the descending flow path is the radius of curvature of the connecting surface connecting the bottom surface and the side wall of the ascending portion of the ascending flow path. Greater than the radius of curvature.
According to the present invention configured as described above, the radius of curvature of the connecting surface connecting the descending bottom surface and the side wall of the descending flow path is the curvature of the connecting surface connecting the bottom surface and the side wall of the ascending portion of the ascending flow path. Greater than the radius. As a result, the height of the washing water flowing between the descending bottom surface and the side wall of the descending flow path from the descending bottom surface rises in the water level of the washing water flowing between the bottom surface and the side wall of the ascending portion of the ascending flow path. It will be higher than the height from the bottom of the part. Further, the flow velocity of the washing water flowing on the falling bottom surface becomes larger than the flow velocity of the washing water flowing on the bottom surface of the rising portion of the rising flow path. Therefore, according to the present invention, the flow of the washing water directed to the region on the bottom surface side by the descending bottom surface can be more easily separated from the connecting surface.

In the present invention, preferably, on the bottom surface of the descending flow path of the drainage flow path, the direction of the horizontal flow of drainage flowing from the bottom surface to the drainage port is to the left and right of the center of the drainage port. A guide portion is formed to guide the water to flow toward either side.
According to the present invention configured as described above, on the bottom surface of the descending flow path of the drainage channel, the direction of the horizontal flow of the drainage flowing toward the drainage port is either left or right of the center of the drainage port. Since a guide part is formed to guide the water to flow toward one side, the drainage that flows into the drainage port is eccentric from the center of the drainage port and easily flows in, so that the drainage flows through the drainage channel (drainage). It is possible to prevent the occurrence of self-siphon in the drainage channel and the drainage pipe by sealing a part of the drainage pipe and the trap etc.). Therefore, according to the present invention, it is possible to further prevent the water sealing of the flush toilet from being drawn to the downstream side.

According to the flush toilet of the present invention, the occurrence of the self-siphon action can be further suppressed, and the sealing water can be reliably suppressed from being drawn to the downstream side.

It is a top view of the flush toilet according to the 1st Embodiment of this invention. It is a vertical cross-sectional view of a flush toilet as seen along the line II-II of FIG. It is sectional drawing seen along the line III-III of FIG. It is sectional drawing seen along the IV-IV line of FIG. It is sectional drawing seen along the VV line of FIG. It is sectional drawing seen along the VI-VI line of FIG. It is a partially enlarged vertical cross-sectional view which shows the drainage flow path of FIG. 2 enlarged. It is a top view of the drainage flow path shown in FIG. 7. It is a vertical sectional view of the flush toilet according to the 2nd Embodiment of this invention. 9 is a partially enlarged vertical cross-sectional view showing an enlarged drainage flow path of FIG. It is sectional drawing seen along the XI-XI line of FIG. It is sectional drawing seen along the XII-XII line of FIG. It is sectional drawing seen along the XIII-XIII line of FIG. It is sectional drawing seen along the XIV-XIV line of FIG. It is sectional drawing seen along the XV-XV line of FIG. It is a perspective view which shows the bottom surface of the descending pipe of the flush toilet according to the 2nd Embodiment of this invention. It is a top view which shows the bottom surface of the descending line of FIG. It is a perspective view which shows the modification of the bottom surface of the descending pipe of a flush toilet according to 2nd Embodiment of this invention.

First, with reference to FIGS. 1 and 2, the basic structure of a flush toilet according to the first embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, the flush toilet bowl 1 according to the first embodiment of the present invention has a toilet bowl main body 2 and a water storage tank 4 for storing wash water supplied to the toilet bowl main body 2. The toilet bowl body 2 is entirely made of pottery. The flush toilet 1 may use another water supply source (water supply or the like) instead of the water storage tank 4.

The water storage tank 4 stores about 3.6 liters to about 4.8 liters of wash water, and a tank drain port 6 is formed on the lower surface thereof. When the user operates a switch (not shown), the drain valve (not shown) is opened so that the flush water in the water storage tank 4 is supplied to the toilet bowl body 2 from the tank drain port 6 of the water storage tank 4. It has become.

The toilet body 2 has a bowl portion 8 on the front side, and the bowl portion 8 has a bowl-shaped filth receiving surface 10, a rim portion 12 formed on the upper edge of the filth receiving surface 10, and the filth receiving surface 10. A shelf portion 14 formed between the surface 10 and the rim portion 12 is provided. The rim portion 12 is formed with an inner peripheral surface 12a that overhangs inward.

The bowl portion 8 of the toilet bowl body 2 further includes a recess 16 formed below the filth receiving surface 10, and the recess 16 is formed by a vertical wall portion 16a extending in a substantially vertical direction and having a substantially triangular shape in a plan view. Has been done.
A drain trap pipeline 18 which is a drainage flow path for discharging filth together with washing water is formed on the lower side of the recess 16 of the bowl portion 8 of the toilet bowl body 2.

The flush toilet 1 according to the present embodiment is a "flush toilet" that discharges filth by the action of running water due to the drop of the flush water in the bowl portion 8.

On the rear side of the toilet body 2, a common rim headrace 20 extending in the front-rear direction extends from the rear to the front, and the rear side thereof is connected to the tank drain port 6 of the water storage tank 4 described above and is connected to the water storage tank 4. Washing water is flowing in. The front side, which is the downstream end of the common rim headrace 20, is branched into a first rim headrace 22 and a second rim headrace 24.

A first rim spout 26 is formed at the downstream end of the first rim headrace 22, and the first rim spout 26 discharges the flush water of the water storage tank 4 via the common rim headrace 20. It is designed to lead to the water outlet 26. As shown in FIG. 2, the first rim spout 26 is arranged at the center on the left side of the bowl portion 8 when the toilet body 2 is viewed from the front, that is, on the side of the recess 16. Washing water is discharged from the first rim spout 26 toward the front side of the bowl 8 to the shelf 14.

A second rim spout 28 is formed at the downstream end of the second rim headrace 24, and the second rim spout 28 discharges the wash water of the water storage tank 4 via the common rim headrace 20 through the second rim headrace 24. It is designed to lead to the water outlet 28. As shown in FIG. 2, the second rim spout 28 is provided at the rear when the bowl portion 8 is bisected in the front-rear direction, and further, the toilet bowl body 2 is located on the right side of the bowl portion 8 when viewed from the front. Be placed. Further, the washing water is also discharged from the second rim spout 28 onto the shelf 14 toward the rear side of the bowl 8.

Here, in the flush toilet 1 according to the present embodiment, the flush water is discharged from the first rim spout 26 and the second rim spout 28 to the bowl portion 8, and the Zet spout is provided. No Zet water is discharged.

As shown in FIG. 2, the drain trap pipeline 18 includes an inlet 30, which communicates with the bowl portion 8 and the recess 16. The drain trap pipeline 18 descends from the inlet 30 toward the rear ascending pipe 32 and from the downstream end of the ascending pipe 32 (the top 32a of the ascending pipe 32) to the drain port 36 toward the front. It is provided with a descending pipeline 34. The position of the water sealing surface (reservoir surface) W is determined by the highest position (top 32a) of the drain trap pipeline 18.

Further, in the drain trap pipeline 18, the right side wall 18a and the left side wall 18b respectively extend in the vertical direction (vertical direction) when viewed from the front, and the width W1 is constant in the vertical direction (FIGS. 3 to 6). (See FIG. 8).

Next, the drain trap pipeline 18 will be described in detail with reference to FIGS. 2 to 8. First, as shown in FIGS. 2 and 7, the descending pipe 34 of the drain trap pipe 18 has a top surface 40 located on the front side, a back surface 42 located on the rear side and extending in a substantially vertical direction, and the back surface thereof. It has a bottom surface 44 extending from the lower end of the 42 to the drainage port 36 in the front. Here, the descending pipe 34 includes the above-mentioned right side wall 18a and left side wall 18b, the right side wall 18a forming the right side surface of the descending pipe line 34, and the left side wall 18b forming the left side surface of the descending pipe line 34. The right side surface and the left side surface extend in the vertical direction (vertical direction) and the width W1 is constant in the vertical direction.

In the top surface 40 of the descending pipe 34, first, an arc portion 45 having a radius of curvature R1 is integrally formed on the upper side (upstream side) with the bottom surface of the top portion 32a of the ascending pipe 32. Here, the radius of curvature R1 is preferably 10 mm to 50 mm, and forms a gentle arc shape. Further, an inclined surface 46 is formed on the lower side (downstream side) of the arc portion 45 of the top surface 40 of the descending pipe 34, and the inclined surface 46 extends from the upper end to the lower end on the front side of the descending pipe 34. Tilt forward toward the bottom. As shown in FIG. 7, the inclined surface 46 of the descending pipe 34 has an upstream inclined surface 46a that inclines downward by an angle θ1 and an angle θ2 (<θ1) that is smaller than the upstream inclined surface 46a. It is provided with a downstream inclined surface 46b that inclines downward only.

Next, as shown in FIG. 3, a recess 48 is formed at the center of the bottom surface of the top 32a of the rising pipe 32 in the width direction. Similarly, as shown in FIG. 4, a recess 48 is also formed in the central portion of the inclined surface 46 of the descending pipeline 34 in the width direction. In this way, the recess 48 is continuously formed from the top 32a of the ascending pipe 32 to the upstream side of the inclined surface 46 of the descending pipe 34.

Next, as shown in FIGS. 4 to 6, the surface connecting the inclined surface 46 of the descending pipeline 34 and the left and right side walls 18a and 18b is formed in an arc shape, but the radius of curvature thereof is larger than that on the upstream side. The radius of curvature becomes smaller toward the downstream side. Specifically, the surface connecting the inclined surface 46 and the left and right side walls 18a and 18b in FIG. 4 is formed by the radius of curvature R2, and the surface connecting the inclined surface 46 and the left and right side walls 18a and 18b in FIG. 5 is formed by the radius of curvature R3. The surface connecting the inclined surface 46 in FIG. 6 and the left and right side walls 18a and 18b is formed with a radius of curvature R4. The surface connecting the inclined surface 46 and the left and right side walls 18a and 18b is formed so as to satisfy the relationship of R2 ≦ R3 ≦ R4. Here, R2, R3, and R4 are preferably in the range of 10 mm to 45 mm, respectively, on the premise that this magnitude relationship is satisfied.

Next, as shown in FIGS. 7 and 8, the bottom surface 44 of the descending pipeline 34 is formed by a substantially flat surface, and a drainage port 36 is formed on the downstream side (front side), and the drainage port 36 is formed. , The inlet of the drainage pipe 50 arranged outside is connected.
A front bottom surface 52 is formed between the front end of the drainage port 36 of the descending pipe 34 and the lower end of the inclined surface 46. As shown in FIG. 7, the front bottom surface 52 is formed so as to incline downward from the front to the rear.

Next, the operation and operation / effect of the flush toilet 1 according to the above-described embodiment will be described. When the user operates the switch, the drain valve is opened, and the washing water in the water storage tank 4 is supplied from the tank drain port 6 into the common rim headrace 20 of the toilet body 2. The wash water that has flowed into the common rim headrace 20 flows forward, and flows into the first rim headrace 22 and the second rim headrace 24 separately. The wash water is guided to the first rim spout 26 by the first rim headrace 22, and is discharged from the first rim spout 26 onto the shelf 14. Further, the washing water is guided to the second rim spout 28 by the second rim headrace 24, and is discharged from the second rim spout 28 onto the shelf portion 14.

The wash water is discharged from the first rim spout 26 toward the front, while the wash water is discharged from the second rim spout 28 toward the rear, and these wash waters swirl in the same direction (counterclockwise). It becomes a swirling flow. The wash water discharged from the first rim spout 26 mainly cleans the front region of the filth receiving surface 10, and the wash water discharged from the second rim spout 28 mainly cleans the bowl portion 8. The rear region of the receiving surface 10 is designed to be cleaned.

Next, the flow of drainage in the drain trap pipeline 18 of the flush toilet 1 according to the present embodiment will be described with reference to FIGS. 7 and 8. In the flush toilet 1 according to the present embodiment, a part of the drainage flowing through the bottom surface of the top 32a of the rising pipe 32 of the drain trap pipe 18 is formed on the arc portion 45 and the inclined surface 46 of the falling pipe 34 due to the coranda effect. It flows along the drain port 36 and flows into the drain port 36 from the front side to the rear side of the drain port 36 (shown as flow F1 in FIGS. 7 and 8). On the other hand, the rest of the drainage flows along the bottom surface 44 of the descending pipe 34 and flows into the drainage port 36 from the rear side to the front side (indicated as flow F2 in FIGS. 7 and 8). As a result, according to the flush toilet 1 according to the present embodiment, the flow direction of the drainage flowing into the drainage port 36 can be dispersed from the front side and the rear side at least, so that the drainage trap line 18 and the drainage trap line 18 can be dispersed. It is possible to suppress the generation of self-siphon in the drainage pipe 50. Therefore, according to the flush toilet 1 according to the present embodiment, it is possible to prevent the sealed water of the flush toilet 1 from being drawn to the downstream side.

Next, as shown in FIGS. 5 and 6, in the flush toilet 1 according to the present embodiment, the arc portion 45 and the inclined surface of the descending pipeline 34 from the bottom surface of the top 32a of the ascending pipeline 32 of the drain trap pipeline 18. Since the recess 48 is formed toward the upstream side of the 46, the area of the contact surface that comes into contact with the drainage in the arc portion 45 and the inclined surface 46 of the descending pipe 34 is larger than that in the case of a flat surface. As a result, the coranda effect is likely to occur from the bottom surface of the top 32a of the ascending pipe 32 to the arc portion 45 and the inclined surface 46 of the descending pipe 34, whereby the drainage port is likely to occur in the descending pipe 34 of the drain trap pipe 18. The flow direction of the drainage flowing into the 36 can be more dispersed.

Further, in the flush stool 1 according to the present embodiment, the left and right side walls 18a and 18b of the drain trap pipeline 18 are respectively from the left and right sides of the bottom surface of the top 32a of the ascending pipeline 32 to the descending pipeline 34. Since it is formed so as to extend substantially vertically in the vertical direction to the left and right sides of the bottom surface 44, it becomes easy to form a flow along the left and right side walls 18a and 18b of the drain trap pipeline 18 due to the coranda effect, whereby the left and right side walls are easily formed. Since the distance of the drainage flowing through the 18a and 18b is different from the distance of the drainage flowing through the inclined surface 46 and the timing of flowing into the drainage port 36 is different, the drainage flowing into the drainage port 36 can be dispersed in time.

Next, as shown in FIGS. 4 to 6, in the flush toilet 1 according to the present embodiment, the radius of curvature R3 and R4 of the surface connecting the downstream inclined surface 46b and the left and right side walls 18a and 18b are the upstream inclined surface 46a. Since it is larger than the radius of curvature R2 of the surface connecting the left and right side walls 18a and 18b, the Coanda effect is weakened on the downstream inclined surface 46b, and a part of the drainage flowing along the downstream inclined surface 46b becomes the left and right side walls 18a and 18b. Flow down along. Therefore, according to the flush toilet 1 according to the present embodiment, the flow direction of the drainage flowing into the drainage port 36 can be more dispersed.

Next, as shown in FIGS. 7 and 8, in the flush stool 1 according to the present embodiment, the drainage that has flowed to the lower end along the inclined surface 46 of the descending pipe 34 of the drain trap pipe 18 is drained. Since the drainage flows from the front bottom surface 52 in front of the 36 to the drain port 36 in the rear direction, a large amount of drainage flows along the front end of the drainage pipe 50 generated when the drainage flows from the bottom surface 44 to the drainage port 36 in the front direction. Occurrence can be suppressed. As a result, according to the flush toilet 1 according to the present embodiment, it is possible to suppress the generation of self-siphon in the drainage pipe 50.

Next, the basic structure of the flush toilet according to the second embodiment of the present invention will be described with reference to FIGS. 9 and 10.
The second embodiment is an example in which a descending bottom surface, a connecting surface, a bottom surface, and the like are added to the descending pipeline of the flush toilet according to the first embodiment. FIG. 9 is a vertical cross-sectional view of a flush toilet according to the second embodiment of the present invention, and FIG. 10 is a partially enlarged vertical cross-sectional view showing the drainage flow path of FIG. 9 in an enlarged manner.
Since the flush toilet 101 according to the second embodiment has substantially the same structure as the flush toilet 1 according to the first embodiment described above, only the points different from the first embodiment of the second embodiment of the present invention will be described. However, the same reference numerals are given to the drawings for similar parts, and the description thereof will be omitted.

As shown in FIG. 9, the flush toilet 101 according to the first embodiment of the present invention has a toilet body 102 and a water storage tank 4 for storing the washing water supplied to the toilet body 102. The toilet bowl body 102 is entirely made of pottery. The flush toilet 1 may use another water supply source (water supply or the like) instead of the water storage tank 4.

A drain trap pipeline 118, which is a drainage flow path for discharging filth together with washing water, is formed on the lower side of the recess 16 of the bowl portion 8 of the toilet bowl body 102.

As shown in FIG. 9, the drain trap pipeline 118 includes an ascending pipeline 32, which is an ascending flow path that rises rearward from the inlet 30, and a downstream end of the ascending pipeline 32 (top 32a of the ascending pipeline 32). ), A descending pipe 134, which is a descending flow path that descends forward from) to the drain port 36.

Further, in the drain trap pipeline 18, the right side wall 18a and the left side wall 18b respectively extend in the vertical direction (vertical direction) when viewed from the front, and the width W1 in the left-right direction is constant in the up-down direction (see FIG. 17). ).

Next, the drain trap pipeline 118 will be described in detail with reference to FIGS. 9 to 15. 11 is a cross-sectional view taken along line XI-XI of FIG. 9, FIG. 12 is a cross-sectional view taken along line XII-XII of FIG. 9, and FIG. 13 is a line of XIII-XIII of FIG. FIG. 14 is a cross-sectional view taken along the line XIV-XIV of FIG. 9, and FIG. 15 is a cross-sectional view taken along the line XV-XV of FIG.

The descending pipe 134 of the drain trap pipe 118 extends from the top surface 40 located on the front side, the back surface 42 located on the rear side and extending in a substantially vertical direction, and the drainage port 36 in front from the lower end of the back surface 42. It has a bottom surface 144. The right side wall 18a forms the right side surface of the descending pipe 134, and the left side wall 18b forms the left side surface of the descending pipe 134. These right side surfaces and left side surfaces extend in the vertical direction (vertical direction), and the width W1 in the left-right direction is constant in the vertical direction.

As shown in FIG. 10, the descending pipe 134 is a descending bottom surface 135 that inclines downward from the top 32a of the ascending pipe 32, and is a bottom surface 144 of the descending pipe 134 and an upper region D thereof. A connecting surface 137 that connects a descending bottom surface 135 extending toward any of the regions, a lower end of the descending bottom surface 135, and an upper end of an inclined surface 46 described later in the descending pipeline 134, and is a vertical cross section in the front-rear direction. A connecting surface 137 is provided, wherein the radius of curvature R12 of the connecting surface 137 is smaller than the radius of curvature R11 of the descending bottom surface 135.

The descending bottom surface 135 is integrally formed with the bottom surface of the top portion 32a of the ascending pipe line 32. The descending bottom surface 135 forms a part of the top surface of the descending pipeline 134 as seen from the drainage port 36 side. The descending bottom surface 135 forms an arc-shaped curved surface extending toward any of the bottom surface 144 and the upper region D of the bottom surface 144. The descending bottom surface 135 forms an arc shape having a relatively large radius of curvature R11 from the front end 135a to the rear end 135b in the cross section of the toilet bowl body 2 in the front-rear direction. The descending bottom surface 135 forms an arc shape close to a straight line from the front end 135a to the rear end 135b in the cross-sectional view. The descending bottom surface 135 may form a straight line from the front end 135a to the rear end 135b in the cross-sectional view. When the descending bottom surface 135 forms a straight line from the front end 135a to the rear end 135b, the radius of curvature of the straight line of the descending bottom surface 135dc can be expressed as almost infinite (a very large radius of curvature). The connecting portion between the descending bottom surface 135 and the connecting surface 137 is the rear end 135b of the descending bottom surface 135 (the upper end (front end) 137a of the connecting surface 137), and forms a change portion of the radius of curvature in the front-rear direction. The radius of curvature R11 is a value in the range of, for example, 30 mm to 50 mm in the vertical cross-sectional view shown in FIG. The radius of curvature R10 of the bottom surface reaching the top 32a of the rising pipe line 32 connected to the descending bottom surface 135 is a value in the range of, for example, 10 mm to 40 mm in the vertical cross-sectional view shown in FIG.

The descending bottom surface 135 in the present embodiment extends toward the upper region D of the bottom surface 144, another region behind the bottom surface 144, and another term, the back surface 42. Therefore, when the virtual tangent A of the descending bottom surface 135 is defined, the virtual tangent line A intersects the bottom surface 144 or the upper region D (or the back surface 42). The surface of the descending bottom surface 135 has a relatively large radius of curvature, so that the flow of the washing water flowing on the descending bottom surface 135 can be arranged in a direction along the descending bottom surface 135 and can be easily guided in this direction.

As shown in FIG. 13, the descending bottom surface 135 forms a relatively flat flat portion 135c that extends in the left-right direction in the central region of the cross section of the toilet bowl body 2 in the left-right direction.

The connecting surface 137 is integrally formed with the descending bottom surface 135. The connecting surface 137 forms a part of the top surface of the descending pipe 134 when viewed from the drainage port 36 side. The connecting surface 137 is formed so that the radius of curvature R12 of the connecting surface 137 in the vertical cross section in the front-rear direction is smaller than the radius of curvature R11 of the descending bottom surface 135. Therefore, the connecting surface 137 forms an arc-shaped curved surface extending toward the front side of the bottom surface 144. The connecting surface 137 forms an arc shape having a relatively small radius of curvature from the upper end (front end) 137a to the lower end 137b in the cross section of the toilet bowl body 2 in the front-rear direction. In the present embodiment, the connecting surface 137 forms a curved surface that is folded back from the rear direction to the front direction. Therefore, the rear end 137c of the connecting surface 137 is formed between the upper end (front end) 137a and the lower end 137b. The rear end 137c of the connecting surface 137 of the descending pipe 134 is located behind the central axis C (see FIG. 9) of the drainage port 36. The radius of curvature R12 is a value in the range of, for example, 10 mm to 25 mm in the vertical cross-sectional view shown in FIG.

The washing water flowing into such a connecting surface 137 initially forms a flow in the direction along the descending bottom surface 135. On the other hand, since the connecting surface 137 forms a curved surface having a relatively small radius of curvature, it is difficult for the washing water to form a flow along the connecting surface 137. Therefore, the washing water is easily separated from the connecting surface 137 by the connecting surface 137.

The width B2 in the front-rear direction from the upper end (front end) 137a to the rear end 137c of the connecting surface 137 of the descending pipe 134 is smaller than the width B1 in the front-rear direction from the front end 135a to the rear end 135b of the descending bottom surface 135. Therefore, it is difficult for the cleaning water to flow along the connecting surface 137, and the cleaning water flowing from the descending bottom surface 135 along the connecting surface 137 can be more easily separated toward the upper region on the bottom surface 144 side.

As shown in FIG. 14, the connecting surface 137 forms a relatively flat flat portion 137d extending in the left-right direction in the central region of the cross section of the toilet bowl body 2 in the left-right direction.

As shown in FIG. 10, the descending pipeline 134 further includes an inclined surface 46 formed on the lower side (downstream side) of the connecting surface 137. The inclined surface 46 is integrally formed with the connecting surface 137. The inclined surface 46 forms a part of the top surface of the descending pipe 134. The inclined surface 46 is inclined forward downward from the upper end to the lower end on the front side of the descending pipe 134. The inclined surface 46 of the descending pipeline 134 is an upstream inclined surface 46a that inclines downward by an angle θ1 and a downstream side that inclines downward by an angle θ2 (<θ1) that is smaller than the upstream inclined surface 46a. It has an inclined surface 46b.

Next, as shown in FIG. 12, a recess 48 is formed at the center of the bottom surface of the top 32a of the rising pipe 32 in the width direction. Similarly, as shown in FIGS. 13 to 15, recesses 48 are also formed in the descending bottom surface 135 of the descending pipeline 34, the connecting surface 137, and the center portion of the inclined surface 46 in the width direction. In this way, the recess 48 is continuously formed from the top 32a of the ascending pipe 32 to the upstream inclined surface 46a of the inclined surface 46 of the descending pipe 134.

Next, as shown in FIGS. 11 to 15, the surface connecting the ascending pipe 32 or the descending pipe 134 and the left and right side walls 18a and 18b is mainly formed in an arc shape. The radius of curvature R15 of the surface connecting the descending bottom surface 135 of the descending pipe 134 and the left and right side walls 18a and 18b is the radius of curvature R13 (or R14) of the surface connecting the ascending portion bottom surface 32b of the ascending pipe 32 and the left and right side walls 18a and 18b. ) Is larger than. Further, the radius of curvature R14 is larger than the radius of curvature R13. Further, the surface connecting the connecting surface 137 and the left and right side walls 18a and 18b is formed with a radius of curvature R16, and the surface connecting the upstream inclined surface 46a and the left and right side walls 18a and 18b is formed with a radius of curvature R17. Therefore, the surface connecting the ascending pipe 32 or the descending pipe 134 and the left and right side walls 18a and 18b is formed so as to satisfy the relationship of R13 <R14 <R15. Further, the surface connecting the descending pipeline 134 and the left and right side walls 18a and 18b is formed so as to satisfy the relationship of R17 <R16 <R15.

Further, in the inclined surface 46 of the descending pipe 134, the radius of curvature of the surface connecting the inclined surface 46 and the left and right side walls 18a and 18b is smaller toward the downstream side than on the upstream side. Specifically, the surface connecting the inclined surface 46 and the left and right side walls 18a and 18b is formed by the radius of curvature R2 (see FIG. 4), and the surface connecting the inclined surface 46 and the left and right side walls 18a and 18b is formed by the radius of curvature R3 (see FIG. 4). (See FIG. 5), the surface connecting the inclined surface 46 and the left and right side walls 18a and 18b is formed with a radius of curvature R4 (see FIG. 6). The surface connecting the inclined surface 46 and the left and right side walls 18a and 18b is formed so as to satisfy the relationship of R2 ≦ R3 ≦ R4. Here, R2, R3, and R4 are preferably in the range of 10 mm to 45 mm, respectively, on the premise that this magnitude relationship is satisfied.

Next, the bottom surface of the descending pipe 134 of the drain trap pipe 18 will be described in detail with reference to FIGS. 9, 16 and 17. FIG. 16 is a perspective view showing the bottom surface of the descending pipe of the flush toilet according to the second embodiment of the present invention, and FIG. 17 is a plan view showing the bottom surface of the descending pipe of FIG.
As shown in FIGS. 16 and 17, the descending pipeline 134 includes a bottom surface 144, and the bottom surface 144 forms a region on the rear side (upstream side) of the drainage port 36.

As shown in FIG. 16, a guide portion 41 is provided on the rear side (upstream side) of the bottom surface 144 of the descending pipeline 134. The guide portion 41 includes four surfaces, an upper surface 41a, an inclined surface 41b, an inclined surface 41c, and an inclined surface 41d. All of these four surfaces 41a, 41b, 41c, and 41d are flat surfaces.

The upper surface 41a is a flat surface formed at the highest position on the right side of the rearmost side (uppermost stream side), and is slightly inclined toward the front side (downstream side). The upper surface 41a may be a horizontal surface without being inclined. The inclined surface 41b is a rectangular inclined surface that inclines downward from the front end of the upper surface 41a toward the front. The inclined surface 41c is a triangular inclined surface that inclines diagonally downward from the left end of the inclined surface 41b toward the left side and the front. The inclined surface 41d is a rectangular inclined surface that inclines downward from the left end of the upper surface 41a toward the left side. Here, the inclination angle of the upper surface 41a, which is a flat surface, is smaller than any of the other inclined surfaces 41b, 41c, and 41d.
As a modification, the upper surface 41a is formed on the left side, the inclined surface 41c is formed so as to incline diagonally downward from the right end of the inclined surface 41b to the right side and forward, and the inclined surface 41d is formed from the right end of the upper surface 41a. It may be formed so as to incline downward toward the right side. At this time, the swirling flow in the drain port 36 becomes a swirling flow in the opposite direction to F4, which will be described later.
Further, the bottom surface 144 of the descending pipe 134 according to the second embodiment of the present invention (the same applies to the modified example of the bottom surface 144 of the descending pipe 134 shown below) is the descending pipe 34 according to the first embodiment of the present invention. Instead of the bottom surface 44, it can be applied to the descending pipeline 34 according to the first embodiment of the present invention.

Next, a modified example of the flush toilet of the present embodiment described above will be described with reference to FIG. FIG. 18 is a perspective view showing a modified example of the bottom surface of the descending pipe of the flush toilet according to the second embodiment of the present invention. In the modified example shown in FIG. 18, a guide portion 43 is formed on the rearmost side (uppermost flow side) of the bottom surface 144 of the descending pipe 134, and the guide portion 43 is inclined diagonally downward toward the right side and forward. It is provided with a triangular flat inclined surface 43a.

In the flush toilet according to this modification, the drainage flowing down from the upstream side of the descending pipe 134 collides with the inclined surface 43a of the guide portion 43, similarly to the flush toilet 1 described above. The drainage that collides with the inclined surface 43a flows to the left along this surface. Therefore, the horizontal flow of drainage on the bottom surface 144 of the descending pipe 134 is directed to the left side of the center of the drainage port 36, that is, the flow is eccentric to the left side. After that, the drainage flows eccentrically from the center of the drainage port 36 into the drainage port 36, and becomes a swirling flow (see flow F4 in FIG. 17) in the drainage port 36. In addition, all or a part of the descending pipe 134 may be formed by a resin drainage socket (not shown).

Next, the operation and operation / effect of the flush toilet 1 according to the above-described embodiment will be described. When the user operates a switch (not shown), the drain valve is opened, the washing water in the water storage tank 4 is supplied to the bowl portion 8, and the filth receiving surface 10 of the bowl portion 8 is washed.

Next, the flow of drainage in the drain trap pipe 18 of the flush toilet 1 according to the present embodiment will be described with reference to FIG. In the flush toilet 1 according to the present embodiment, the drainage flowing on the bottom surface of the top 32a of the rising pipe 32 of the drain trap pipe 18 forms a flow of washing water flowing on the falling bottom surface 135. As shown by the arrow F2, the flow of the washing water flowing on the descending bottom surface 135 is arranged in a direction along the descending bottom surface 135 and is easily guided in this direction.
A part of the washing water flowing into the connecting surface 137 from above the descending bottom surface 135 flows along the connecting surface 137 and the inclined surface 46 due to the Coanda effect, and flows into the drain port 36 from the front side to the rear of the drain port 36 ( (Shown as flow F1 in FIG. 10).

On the other hand, the remaining portion of the washing water flowing into the connecting surface 137 is peeled off from the connecting surface 137 as shown by arrow F3 because the connecting surface 137 forms a curved surface having a relatively small radius of curvature. More specifically, the wash water flowing into the connecting surface 137 forms a flow in the direction of the descending bottom surface 135 (the direction of the virtual tangent line A) as shown by the arrow F2. On the other hand, the connecting surface 137 is curved so as to be separated from the virtual tangent line A. Therefore, the washing water flowing into the connecting surface 137 is easily peeled off from the connecting surface 137.

Further, since the width B2 in the front-rear direction from the upper end (front end) 137a to the rear end 137c of the connecting surface 137 is smaller than the width B1 in the front-rear direction from the front end 135a to the rear end 135b of the descending bottom surface 135, the washing water is connected. It is difficult to follow the surface 137, and the washing water flowing from the descending bottom surface 135 along the connecting surface 137 can be more easily separated toward the region on the bottom surface 144 side.

Further, the radius of curvature R15 of the connecting surface connecting the descending bottom surface 135 of the descending pipe 134 and the left and right side walls 18a and 18b is the curvature of the connecting surface connecting the bottom surface 32b of the rising portion of the ascending pipe 32 and the left and right side walls 18a and 18b. It is larger than the radius R13. As a result, the height of the washing water flowing between the descending bottom surface 135 of the descending pipe 134 and the left and right side walls 18a and 18b from the descending bottom surface 135 is the height of the rising portion of the ascending pipe 32 and the left and right side walls 18a. , The height of the rising portion of the washing water flowing between 18b and 18b is higher than the height from the bottom surface 32b. Further, the flow velocity of the washing water flowing on the descending bottom surface 135 becomes larger than the flow velocity of the washing water flowing on the bottom surface of the rising portion of the rising pipe line 32. Therefore, according to the present invention, the flow of the washing water directed to the region on the bottom surface 144 side by the descending bottom surface 135 can be more easily separated from the connecting surface 137.

As shown by the arrow F3, the wash water separated from the connecting surface 137 forms a flow in the direction of the descending bottom surface 135, so that the wash water is rearward of the toilet bowl body 2 along the virtual tangent line A. It flows like popping out. As shown by the arrow F4, the washing water flows downward mainly from the back surface 42 (rear of the bottom surface 144) side, and flows along the bottom surface 144 of the descending pipe 134.
The rear end 137c of the connecting surface 137 of the descending pipe 134 is located behind the central axis C of the drainage port 36. The washing water separated from the connecting surface 137 of the descending pipe 134 can easily land on the bottom surface 144 on the rear side of the drain port 36. As a result, the flow direction of the washing water flowing into the drain port 36 can be more reliably dispersed at least from the front side and from the bottom surface 144 on the rear side.

As shown in FIG. 17, as shown by the arrow F4, the drainage flowing down from the upstream side of the descending pipeline 134 collides with the four surfaces 41a, 41b, 41c, 41d of the guide portion 41 (see FIG. 16). The drainage that collides with the upper surface 41a becomes a turbulent flow, and then flows along the inclined surface 41b, the inclined surface 41c, and the inclined surface 41d.

The drainage that collides with the inclined surface 41b and the drainage that flows down from the upper surface 41a flows forward along the surface of the inclined surface 41b (see the flow F3 in FIG. 17). The drainage that collides with the inclined surface 41c and the inclined surface 41d and the drainage that flows down from the upper surface 41a flows toward the left side along these surfaces (see flows F1 and F2 in FIG. 17). The flow rate of drainage is larger in the flows F1 and F2 flowing toward the left side than in the flow F3 flowing toward the front. Therefore, the horizontal flow of drainage on the bottom surface 144 of the descending pipe 134 is directed to the left side of the center of the drainage port 36, that is, the flow toward the center of the drainage port 36 is deflected to the side of the left side wall 18b. It becomes an eccentric flow. After that, the drainage flows eccentrically from the center of the drainage port 36 into the drainage port 36, and becomes a swirling flow (see flow F4 in FIG. 17) in the drainage port 36.
In this way, the washing water separated from the connecting surface 137 flows along the bottom surface 144 of the descending pipe 134 and flows into the drain port 36 from the rear side to the front side (shown as flow F4 in FIG. 10). ..

As a result, according to the flush toilet 101 according to the present embodiment, the flow direction of the drainage flowing into the drainage port 36 can be dispersed from the front side and the rear side at least, so that the drainage trap line 118 and the drainage trap line 118 can be dispersed. It is possible to suppress the generation of self-siphon in the drainage pipe 50. Therefore, according to the flush toilet 101 according to the present embodiment, it is possible to prevent the sealed water of the flush toilet 101 from being drawn to the downstream side.

According to the flush toilet 101 according to the present embodiment, the flush bottom 135 of the descending pipe 134 forms a flow of washing water toward the bottom 144 of the descending pipe 134 and the upper region D thereof. Can be done. Further, since the radius of curvature of the connecting surface 137 of the descending pipe 134 is smaller than the radius of curvature of the descending bottom surface 135, the flow of the washing water directed to the region on the bottom surface 144 side by the descending bottom surface 135 is guided by the connecting surface 137. It can be easily peeled off from 137. As a result, according to the present invention, the washing water flowing from the descending bottom surface 135 along the connecting surface 137 can be easily separated from the lower surface 144 toward the upper region D and the like, and from the connecting surface 137 along the inclined surface 46. It is possible to suppress the generation of self-siphon in the drainage channel and the drainage pipe due to the excessive amount of washing water flowing.

According to the flush urinal 101 according to the present embodiment, the width B2 in the front-rear direction from the front end 137a to the rear end 137c of the connecting surface 137 of the descending pipeline 134 is the front-rear direction from the front end 135a to the rear end 135b of the descending bottom surface 135. Since it is smaller than the width B1, it is difficult for the washing water to follow the connecting surface 137, and the washing water flowing from the descending bottom surface 135 along the connecting surface 137 can be more easily separated toward the upper region D of the bottom surface 144 and the like. .. Therefore, it is possible to further suppress the generation of self-siphon in the drainage flow path and the drainage pipe due to the excessive amount of washing water flowing from the connecting surface 137 along the inclined surface 46.

According to the flush toilet 101 according to the present embodiment, the washing water separated from the connecting surface 137 of the descending pipe 134 is likely to land on the bottom surface 144 on the rear side of the drain port 36. As a result, the flow direction of the washing water flowing into the drain port 36 can be reliably dispersed at least from the front side and from the bottom surface 144 on the rear side, and self-siphon is generated in the drain flow path and the drain pipe. Can be suppressed.

According to the flush toilet 101 according to the present embodiment, the radius of curvature R15 of the connecting surface connecting the descending bottom surface 135 and the side wall of the descending pipe 134 is the connecting surface connecting the rising portion bottom surface 32b and the side wall of the ascending pipe 32. It is larger than the radius of curvature R13 (or R14). As a result, the height of the water surface of the washing water flowing between the descending bottom surface 135 and the side wall of the descending pipe 134 from the descending bottom surface 135 is the washing water flowing between the rising portion bottom surface 32b and the side wall of the ascending pipeline 32. It is higher than the height from the bottom surface 32b of the rising portion of the water surface. Further, the flow velocity of the washing water flowing on the descending bottom surface 135 is larger than the flow velocity of the washing water flowing on the rising portion bottom surface 32b of the rising pipe line 32. Therefore, according to the present invention, the flow of the washing water directed to the upper region D of the bottom surface 144 by the descending bottom surface 135 can be more easily separated from the connecting surface 137.

According to the water-washing stool 101 according to the present embodiment, the horizontal flow direction of the drainage flowing toward the drainage port 36 is directed to the left and right of the center of the drainage port 36 on the bottom surface 144 of the descending pipe 134 of the drainage channel. Since the guide portion 41 is formed to guide the drainage so as to flow toward either one of the two sides, the drainage flowing into the drainage port 36 is likely to flow eccentrically from the center of the drainage port 36 by this guide portion 41. It is possible to prevent the drainage from generating self-siphon in the drainage channel and the drainage pipe by sealing the drainage channel (drainage trap or the like) and a part of the drainage pipe. Therefore, according to the present invention, it is possible to further prevent the sealing water of the flush toilet 1 from being drawn to the downstream side.

As a modification, the descending pipeline 134 is formed in a state where either the descending bottom surface 135 or the connecting surface 137 is changed to a flow path having a different shape, that is, either the descending bottom surface 135 or the connecting surface 137 is adopted. May be done. In this case, a flow of washing water corresponding to the shape of the descending bottom surface 135 or the connecting surface 137 can be generated.

1 Washing toilet 2 Toilet bowl body 4 Water storage tank 8 Bowl part 16 Recession 30 Inlet 32 Ascending pipe line 32a Top 32b Bottom side 34 Down pipe 36 Drainage port 41 Guide part 43 Guide part 44 Bottom surface 46 Inclining surface 46a Upstream side inclined surface 46b Downstream Side inclined surface 48 Recession 50 Drainage pipe 52 Front side bottom surface 101 Washing toilet 118 Drainage trap line 134 Down line 135 Down bottom 135a Front end 135b Rear end 137 Connecting surface 137b Lower end 137c Rear end 144 Bottom surface B1 Width B2 Width C Central axis D Upper area

Claims (9)

In a flush toilet having a bowl portion that receives filth and a drainage channel that extends to a drainage port connected to the lower part of the bowl portion and connected to the entrance of an external drainage pipe and stores sealed water in a part thereof.
The drainage flow path includes an ascending flow path that rises from the lower part of the bowl portion toward the rear, and a descending flow path that descends from the downstream end of the ascending flow path to the drainage port.
The descending flow path of the drainage flow path is provided with a bottom surface on the rear side of the drainage port, and on the front side thereof, the upper end thereof is integrally formed with the top bottom surface of the ascending flow path and from the upper end to the lower end thereof. A flush toilet in which an inclined surface that inclines forward toward the bottom is formed, and a recess is formed from the bottom surface of the top of the ascending flow path of the drainage flow path to at least the upstream side of the inclined surface of the descending flow path . The drainage flow path is provided with left and right side surfaces, and each of these left and right side surfaces extends substantially vertically in the vertical direction from the left and right side portions of the top bottom surface of the ascending flow path to the left and right side portions of the descending flow path. The flush toilet according to claim 1, which is formed in. The inclined surface of the descending flow path includes an upstream inclined surface and a downstream inclined surface, and the radius of curvature of the surface connecting the downstream inclined surface and the left and right side surfaces is larger than the radius of curvature of the surface connecting the upstream side inclined surface and the left and right side surfaces. The flush toilet according to claim 1 or 2 , which is also large. The flush toilet according to any one of claims 1 to 3 , wherein a front bottom surface is formed between the lower end of the inclined surface of the descending flow path of the drainage flow path and the front end of the drainage port. .. The descending flow path further
A descending bottom surface that is inclined rearward from the top of the ascending flow path, and extends toward any of the bottom surface of the descending flow path and the upper region thereof, and the descending bottom surface.
A connecting surface that connects the lower end of the descending bottom surface and the upper end of the inclined surface of the descending flow path, and the radius of curvature of the connecting surface in the vertical cross section in the front-rear direction is smaller than the radius of curvature of the descending bottom surface. The flush toilet according to any one of claims 1 to 4 , further comprising the connecting surface. The descending flow path further
A descending bottom surface that is inclined rearward from the top of the ascending flow path, and extends toward any of the bottom surface of the descending flow path and the upper region thereof, and the descending bottom surface.
A connecting surface that connects the lower end of the descending bottom surface and the upper end of the inclined surface of the descending flow path, and the radius of curvature of the connecting surface in the vertical cross section in the front-rear direction is smaller than the radius of curvature of the descending bottom surface. With the above connecting surface,
The width of the descending flow path in the front-rear direction from the front end to the rear end of the connecting surface is smaller than the width in the front-rear direction from the front end to the rear end of the descending bottom surface, according to any one of claims 1 to 5. The listed flush toilet. The descending flow path further
A descending bottom surface that is inclined rearward from the top of the ascending flow path, and extends toward any of the bottom surface of the descending flow path and the upper region thereof, and the descending bottom surface.
A connecting surface that connects the lower end of the descending bottom surface and the upper end of the inclined surface of the descending flow path, and the radius of curvature of the connecting surface in the vertical cross section in the front-rear direction is smaller than the radius of curvature of the descending bottom surface. With the above connecting surface,
The flush toilet according to any one of claims 1 to 6 , wherein the rear end of the connecting surface of the descending flow path is located behind the central axis of the drain port. The descending flow path further
A descending bottom surface that is inclined rearward from the top of the ascending flow path, and includes the descending bottom surface extending toward any of the bottom surface of the descending flow path and the upper region thereof.
Any of claims 1 to 7 , wherein the radius of curvature of the connecting surface connecting the descending bottom surface and the side wall of the descending flow path is larger than the radius of curvature of the connecting surface connecting the bottom surface and the side wall of the rising portion of the ascending flow path. The flush toilet according to item 1. On the bottom surface of the descending flow path of the drainage channel, the direction of the horizontal flow of drainage flowing from the bottom surface to the drainage port is directed to either the left or right side of the center of the drainage port. The flush toilet according to any one of claims 1 to 8 , wherein a guide portion for guiding the water to flow is formed.

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