JP2011174363A - Water closet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water closet which enhances flushing efficiency by being prevented from being clogged with soil. <P>SOLUTION: In the water closet 1 having a trap drainage channel 6 inclined upward toward a downstream side from a trap inlet 5, an upward inclined ascending pipe 6P of the trap drainage channel 6 is formed so that a vertical dimension of a cross section perpendicular to a drainage direction of flushing water can be increased toward the downstream side from the trap inlet 5, and the trap inlet 5 is opened in a shape in which a width dimension is larger than a vertical one. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a flush toilet bowl.

  Conventionally, as disclosed in Patent Document 1, in a flush toilet having a trap drainage channel that is inclined upward from the inlet port at the lower end toward the downstream side, the inlet port of the inlet conduit portion is in the trap drainage channel. Some are formed in the narrowest pipe area.

JP-A-8-232330

The flush toilet disclosed in the above-mentioned Patent Document 1 is such that the inlet of the trap drainage channel is formed with a narrow pipe area in order to prevent clogging of filth at the rising part of the trap drainage channel. Since the road area was small, the washing water could not flow quickly and smoothly. Furthermore, since the cross-sectional area of the rising part of the trap drainage channel is gradually increasing, turbulence is likely to occur, resistance is generated, and it is difficult to smoothly flow cleaning water and filth into the trap drainage channel. was there.
Moreover, since the inlet of the trap drainage channel is narrow in the vertical and horizontal directions, there is a problem that clogging may occur at the inlet.

The present invention aims to provide a flush toilet that prevents clogging of dirt and can be washed smoothly. In order to achieve at least a part of this object, the following measures are taken.
The present invention is a flush toilet having a trap drainage channel inclined upward from the trap inlet toward the downstream side,
The upwardly inclined riser pipe of the trap drainage channel is formed so that the vertical dimension of the cross section perpendicular to the drainage direction of the washing water increases from the trap inlet toward the downstream side,
The gist of the invention is that the trap inlet is opened in a shape having a width dimension larger than a vertical dimension.

The cleaning water flowing into the trap inlet will sink in the vertical direction below the trap inlet, so the flow rate of the lower cleaning water is slow and prone to stagnation, and the cleaning water flows vertically above the trap inlet. Since there is no dive, the flow rate becomes large. In the flush toilet of the present invention, the vertical dimension of the trap inlet is reduced, the lower portion where the flow velocity is lower is reduced, and the lateral width dimension of the trap inlet is increased, thereby increasing the amount of washing water in the upper portion where the flow velocity is higher. By increasing the flow rate of the cleaning water at the trap inlet, the cleaning water and the filth can be poured into the trap inlet at a high speed, thereby enabling smooth discharge and reducing pressure loss.
Further, since the vertical dimension of the trap inlet is small and the horizontal dimension is large, and the washing water can be flowed at a high speed, clogging of filth at the trap inlet is eliminated.
Moreover, since the vertical dimension of the cross section of the rising pipe of the trap drainage channel becomes larger toward the top, the trap drainage clogging does not occur. Furthermore, since the shape of the trap inlet is easy to rectify at the inlet, turbulence is unlikely to occur in the riser pipe of the trap drain.

Further, in the flush toilet of the present invention, a tubular introduction passage in which the upper and lower sides of the drainage channel are inclined downward toward the rear of the toilet may be provided in front of the trap entrance.
In this way, when the cleaning water flows into the trap drain along the inner peripheral surface of the introduction passage toward the trap inlet, the cleaning water is gradually squeezed and rectified, so that the flow of the cleaning water becomes smooth. Since it is straightened in front of the trap inlet, turbulent flow hardly occurs even if the vertical dimension of the trap drainage pipe is increased, and the washing water can be discharged smoothly.

Further, in the flush toilet of the present invention, in the cross section perpendicular to the drainage channel direction in the upstream portion near the trap entrance, the rounded portion connecting the standing surfaces on both sides of the bottom surface is the flow of the swirl flow in the cross section direction. The radius of curvature of the rounded portion from the standing surface to the bottom surface can be made smaller than the curvature radius of the rounded portion from the bottom surface to the standing surface.
In this way, the swirling flow that has flowed into the introduction passage toward the trap inlet smoothly flows into the introduction path by the rounded portion having a small radius of curvature, and collides with a standing surface that leads to the rounded portion having a large radius of curvature. The swirl flow can be changed to the flow in the downstream direction of the drainage channel. Thereby, the flow of the washing water in the direction of drainage can be made smooth.

Further, in the flush toilet of the present invention, the cross-sectional shape perpendicular to the direction of drainage of the wash water in the ascending pipe is such that the upper side from the center in the vertical direction of the cross section is from the lower side from the trap inlet to the downstream intermediate part. It is formed in a shape having a large area, and is formed in a shape in which the lower side from the center in the longitudinal direction of the cross section is larger than the upper side from the intermediate part to the vicinity of the upstream side of the top on the downstream side. You can also.
In this way, the wash water flowing into the riser from the trap inlet will sink below the vertical center of the cross section. Since there is no sinking of washing water above the center of the direction, the flow velocity is large. From the trap inlet to the middle part of the riser, the area on the upper side where the flow velocity is high is increased, and the washing water on the trap inlet side is increased. It is possible to ensure a good flow rate and smooth the flow.
On the other hand, from the middle part of the riser to the vicinity of the upstream side of the top part, conversely, the flow rate of the washing water becomes faster at the lower side than the center in the longitudinal direction of the cross section, and stagnation tends to occur on the upper side. In the vicinity of the upstream side of the top of the downstream side, the area above the center in the longitudinal direction of the cross section is narrowed down so that a large amount of washing water flows to the lower side where the flow rate is fast, and the flow rate of the washing water in this part is maintained well. Thus, the flow rate of the washing water as a whole ascending pipe can be maintained satisfactorily, the washing water flow can be made smooth, and the pressure loss in the ascending pipe can be reduced.

Further, in the flush toilet of the present invention, a rising surface rising in the vertical direction is formed on the inner peripheral side surface of the rising pipe between the intermediate portion and the vicinity of the upstream side of the top portion, and the height of the rising surface May be set to have a maximum height in the vicinity of the upstream side of the top.
In this way, the height of the rising surface is maximized in the vicinity of the upstream side of the top of the riser, the area in the vicinity of the upstream side of the top is expanded, and the flow of cleaning water becomes smooth.
In addition, since the clogging of filth tends to occur when the area in the vicinity of the upstream side of the top portion is narrow, the clogging of filth can be eliminated by expanding the area of this portion.

Moreover, the flush toilet of this invention WHEREIN: The bottom face which comprises the internal peripheral surface of the said rising pipe can also be formed in the substantially flat surface extended in the orthogonal | vertical direction with respect to the discharge direction of washing water.
By doing so, the bottom side that forms the inner periphery of the riser has a large flow rate of washing water and does not stagnate, so a large amount of washing water flows along this bottom side, and the flow rate of washing water is maintained well. Will be able to do.

Further, in the flush toilet of the present invention, a waste rotation space may be formed in the vicinity of the upstream side of the top of the trap drainage channel by inflating the upper surface side of the inner periphery of the trap drainage channel. it can.
In this way, the filth rotates well in the filth rotation space on the inner periphery of the trap drainage channel near the upstream side of the top, and the filth gets over the top of the trap drainage channel and falls downstream. Therefore, filth is not clogged, and even hard and long filth can be discharged well.

Further, in the flush toilet of the present invention, the upper surface constituting the inner peripheral surface of the riser pipe is formed in a substantially mountain shape that is downwardly directed to the left and right from the central portion in the direction perpendicular to the drainage direction of the wash water. You can also
In this way, it is possible to satisfactorily avoid the occurrence of stagnation on the upper surface side that constitutes the inner peripheral surface of the rising pipe, and to allow the washing water to flow smoothly.

Further, the flush toilet of the present invention may be a siphon toilet.
In this way, the washing water can smoothly flow into the trap drainage channel, the siphon can be activated at an early stage with a small amount of water, and the water-saving effect is improved.

It is a longitudinal section lineblock diagram of a siphon type flush toilet. It is a plane lineblock diagram of a siphon type flush toilet. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is the FF sectional view enlarged view of FIG. It is the GG sectional view enlarged view of FIG. It is the II sectional view enlarged view of the II line of FIG. It is the JJ sectional view enlarged view of FIG. It is the KK line sectional enlarged view of FIG. It is an expanded section lineblock diagram showing the 2nd example which is a modification of the part of the riser in a flush toilet. It is LL sectional drawing in FIG. It is MM sectional drawing in FIG. It is NN sectional drawing in FIG. It is OO sectional drawing in FIG. It is PP sectional drawing in FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

FIG. 1 shows a longitudinal sectional view of a siphon flush toilet, and FIG. 2 shows a plan view of the siphon flush toilet.
A bowl surface 3 is formed in the toilet body 2 of the siphon flush toilet 1, a standing surface 4 that continuously falls to the bottom side is formed on the bowl surface 3, and a trap inlet 5 is opened at the deepest position. An inverted U-shaped trap drainage channel 6 inclined upward toward the rear side is formed from the trap inlet 5, and a downward drainage port 7 is formed at the downstream end of the trap drainage channel 6. A separate drain socket 8 is connected to the mouth 7 via a circular rubber packing 13.

Further, on the upper surface side of the toilet body 2, there are provided a rim 9 and a cleaning stage 12 that form a rim water passage 9 a on the outer periphery of the bowl surface 3, and cleaning water is disposed on the rear upper surface side of the toilet body 2. The distributor 10 is arranged, and the wash water flowing out from the first outlet 10 a on one side of the distributor 10 is discharged from the first outlet 11 a, passes through the rim water passage 9 a, and is halfway on the pot surface 3. It is configured to be supplied as a clockwise horizontal swirling flow.
Further, the wash water that has flowed out from the second outlet 10b on the other side of the distributor is discharged from the second outlet 11b, and is an upwardly inclined surface that inclines upward in a curved convex shape toward the rear side continuously from the rear portion of the standing surface 4 The washing water flows down along the line 4 a and is directly supplied to the trap inlet 5. The upward inclined surface 4a is convex, and the washing water from the second water discharge port 11b flows down toward the trap inlet 5, so that the momentum of the horizontal swirling flow is weakened at the rear of the toilet and the horizontal The swirling flow can be converted into a vertical swirling flow that is perpendicular to the direction of drainage, which reduces the centrifugal force of the horizontal swirling flow and prevents the filth from spreading. It can be collected and is configured so that it can be smoothly drained.

  As described above, when the cleaning water swirling on the bowl surface 3 and flowing down into the standing surface 4 and the cleaning water flowing down along the upward inclined surface 4 a are collected at the trap inlet 5, The water surface W rises, the washing water flows over the top 6a in the trap drain 6 and flows down to the drain 7 and is squeezed by the throttle 8a formed in the drain socket 8, so that the trap drain 6 When the trap drainage channel 6 becomes full, a pulling force is generated in the direction of drainage due to the difference in water level with the water surface W on the side of the bowl surface 3 when this trap drainage channel 6 is full, and this siphon action cleans filth well. It can be discharged with water.

The details of the siphon type flush toilet will be described with reference to the cross-sectional views of FIGS.
3 is a cross-sectional view taken along line AA in FIG. 1, FIG. 4 is a cross-sectional view taken along line BB in FIG. 1, and FIG. 5 is a cross-sectional view taken along line CC in FIG. FIG. 7 is a cross-sectional view taken along line DD in FIG. 1, and FIG. 7 is a cross-sectional view taken along line EE in FIG.

As shown in FIG. 3 and FIG. 4, a concave portion 3 a is formed in the central portion of the front bowl surface 3 in the toilet body 2 in the planar view width direction so as to be recessed downward, and both ends of the concave portion 3 a in the planar view width direction. The convex portion 3b is formed continuously and reaches the cleaning stage 12. The convex portion 3b is set to have a smaller radius of curvature than the concave portion 3a.
The concave portion 3a is inclined to gradually increase in depth toward the rear side (standing surface 4 side), and the concave portion 3a is configured to favorably prevent the urine from bouncing on the bowl surface 3. Yes. Moreover, the swirling of the washing water on the bowl surface 3 is stopped at an early stage by the recess 3a, and the washing water flows into the standing surface 4 side along the recess 3a.

The standing surface 4 shown in FIGS. 1 and 5 to 7 is formed in a vertical shape toward the lower side or a convex surface swelled toward the water surface W, and the entire circumference of the standing surface 4 is vertical or the water surface It has a convex shape that bulges to the W side. That is, the standing surface 4 is raised on the outer periphery of the water storage surface W, and the washing water swirling on the bowl surface 3 flows down along the standing surface 4 at an early stage so that the washing water is quickly directed to the trap inlet 5. The standing surface 4 allows the filth to be quickly collected at the trap inlet 5 without spreading outward.
A curved convex R-shaped portion R is formed on the upper portion of the standing surface 4 over the entire circumference, and the upward inclined surface 4a of the rear portion of the toilet bowl is also a part of the rounded portion R. .
The radius of curvature of the rounded portion R is the smallest on the upward inclined surface 4a. That is, at the rear part of the toilet bowl, it is preferable that the radius of curvature is small in order to allow the washing water from the second water outlet 11b to flow down toward the trap inlet 5. On the other hand, since the radius of curvature of the rounded portion R is large at the front portion of the toilet bowl, the swirling flow that has fallen into the standing surface 4 is prevented from climbing up the standing surface 4 again and spreading outward, so that the washing water can quickly enter the trap inlet 5. It is made to go.

As shown in FIG. 2, the plan view shape of the water storage surface W in the standing surface 4 is a substantially elliptical shape that is long in the front-rear direction.
In addition, the curvature radius R2 on the front side is set to be the largest in the plan view shape of the water storage surface W, and the washing water is rebounded by the standing surfaces 4 on the left and right sides of the front portion where the curvature radius R2 is large. It is configured to face the trap inlet 5.
Further, the point P having the maximum lateral width in a plan view is set in front of the center of the water surface W in the front-rear direction, and the wash water that flows from the bowl surface 3 along the standing surface 4 to the water surface W It is configured such that it is rebounded at the front portion where the radius of curvature R2 is large, and is collected at an increased speed as it approaches the rear trap inlet 5 after the point P. As a result, the washing water and the filth flow into the trap inlet 5 quickly, and the siphon can be activated quickly by collecting the filth at the trap inlet 5 with a small amount of washing water.

As shown in FIG. 8 (cross-sectional view taken along the line FF in FIG. 1), the trap inlet 5 has a substantially horizontal top and bottom surface, and the upper corner is square. The lower corners are round and generally D-shaped as a whole. The trap inlet 5 is opened in a shape having a width dimension larger than the vertical dimension. The trap inlet 5 has a vertical dimension a of 50 mm and a horizontal dimension b of 77 mm.
By making the width dimension larger than the vertical dimension in this way, the washing water, suspended matter and the like smoothly flow into the trap inlet 5, and the siphon can be activated at an early stage.
That is, at the trap inlet 5, the vertical portion of the wash water that flows into the trap in the vertical direction slows down and stagnates by being swung downward. Since the area of the upper part where the speed of the washing water is high is increased, the washing water can smoothly flow into the trap inlet 5 quickly without stagnation and can be rectified at the trap inlet 5. Furthermore, since there is a width, clogging of filth at the trap inlet 5 does not occur. In addition, it can be said that making the upper corner portion round in the substantially D-shaped cross-sectional shape increases the area of the upper portion of the cross-section where the flow rate of the washing water flowing in is high, and is a preferable shape.

The vertical dimension a of the trap inlet 5 is preferably set in the range of 50 mm to 60 mm, and the lateral width dimension b is preferably set in the range of 70 mm to 85 mm.
Further, the trap inlet 5 is not limited to the D-shaped cross section as shown in FIG. 8, and a sufficient effect can be obtained even when the trap inlet 5 has a shape such as an ellipse whose width is larger than the length. Note that the effect of the horizontally long rectangular cross section is greater than that of the elliptical cross section, and the effect of the substantially D-shaped cross section is greater than that of the horizontally long rectangular cross section.
Further, as shown in FIG. 1, an introduction passage 5a extending downward toward the trap inlet 5 is provided in front of the trap inlet 5, and cleaning water flows along the inner peripheral surface of the introduction passage 5a. When flowing into the trap drain 6, the wash water is squeezed and rectified, and the flow of the wash water becomes smooth.
Since the water is rectified in front of the trap inlet 5 and can be rectified in the flat trap inlet 5, the washing water flows into the trap drainage channel 6 while being rectified, and the vertical pipe 6P of the trap drainage channel Even if the dimensions are increased, turbulent flow is unlikely to occur and the washing water can be discharged smoothly.

Further, as shown in FIGS. 7 and 8, the shape of the introduction passage 5a in front of the trap inlet 5 is such that the rounded portion connecting the standing surfaces 5c on both sides of the bottom surface 5b has a swirling flow in the cross-sectional direction. The radius of curvature of the left rounded portion 5d as viewed from the front of the toilet bowl from the standing surface 5c to the bottom surface 5b is set smaller than the radius of curvature of the rounded portion 5e from the bottom surface 5b to the standing surface 5c. That is, the left rounded portion 5d has a smaller radius of curvature than the right rounded portion 5e, and is formed on a rounded surface that is gently bent.
The washing water forms a counterclockwise horizontal swirling flow on the bowl surface 3, and becomes a swirling flow in the vertical direction by the washing water flowing from the upper inclined surface 4a and flows into the introduction passage 5a. At this time, since the rounded portion 5d on the left side is a curved surface that is gently bent, the washing water smoothly flows into the introduction passage 5a. The washing water that has flowed into the introduction passage 5a collides with the right-side standing surface 5c that rises linearly from the right-side curved portion 5e having a large curvature and flows in the downstream direction of the trap drain 6 To change.
In this way, the introduction passage 5a can change the flow swirling in the bowl surface 3 of the toilet bowl into a flow in the downstream direction of the trap drain 6 and rectify the flow.

In addition, the rounded portions 5d and 5e are not limited to the tubular introduction passage 5a, but also in the introduction passage that is not tubular as shown in Patent Document 1, by providing a similar shape on the descending inclined surface of the bottom surface of the introduction passage 5a, The same rectifying effect can be obtained.
Further, when the swirl flow is clockwise, the shapes of the rounded portions 5d and 5e of the introduction passage 5a are reversed in the left-right direction.

12 is a cross-sectional configuration view taken along the line KK of FIG.
As shown in FIG. 12, as for the cross-sectional shape of the trap drainage channel 6 in front of the top 6a, the lateral width b is set to 77 mm, and the longitudinal dimension c is set to 62 mm. That is, in FIG. 12, the central portion on the upper surface side of the inner periphery of the trap drainage channel 6 is formed to bulge upward, and the filth is easily rotated by the portion bulged upward, so clogging of filth is near the top 6a. It becomes difficult to occur.
In this way, the filth rotation space 6b is formed by inflating the center portion on the upper surface side, so that the filth can rotate well in the filth rotation space 6b and fall to the drain port 7 beyond the top 6a. Thus, even hard and long filth can be discharged without clogging.

In addition, since it is only necessary for the filth to be able to satisfactorily exceed the top portion 6a, it is preferable to set the vertical dimension c to 53 mm or more as a dimension that allows the filth to rotate well. Moreover, it is preferable to set the width dimension b in the range of 70 mm-85 mm.
In this way, the siphon can be started smoothly and smoothly by quickly filling the washing water up to the throttle portion 8a (inner diameter 53 mm) of the drain socket 8 without clogging the dirt, and it is good with less water. It can be washed.

Moreover, FIG. 9 shows the GG sectional view taken on the line of FIG.
FIG. 9 shows the cross-sectional shape of the top portion 6 a of the trap drainage channel 6, the lower surface of the top portion 6 a has a horizontal shape, and the lateral width dimension b is set to 77 mm, which is the same as the lateral width dimension of the trap inlet 5. Has been.
That is, the top portion 6 a of the trap drainage channel 6 also has a horizontal bottom surface and a wide width, and the water level of the water storage surface W in the trap drainage channel 6 is caused by the wash water pushed into the trap drainage channel 6. When it rises slightly above the top portion 6a, the width dimension b is wide and the bottom surface is horizontal, so that a large amount of water flows down toward the drain port 7 vigorously, and the siphon can be activated quickly.
In general, the horizontal width of the top portion 6a is 50 mm to 60 mm, but the horizontal width b is preferably 75 mm or more.
In FIG. 1, the vertical dimension of the cross section of the rising pipe 6P gradually increases from the trap inlet 5 to the top part 6a. However, the vertical dimension at the top part 6a does not hinder the rotation of filth. It may be narrower than the cross section taken along the line KK of FIG.

  10 is a cross-sectional view taken along the line II in FIG. 1, and FIG. 11 is a cross-sectional configuration view taken along the line JJ in FIG. The drainage channel 7 is formed in a circular shape, and the lower end side has a narrowed shape with an inner diameter of 58 mm.

  In addition, the plan view shape of the water storage surface W as shown in FIG. 2 is a substantially elliptical shape that is long in the front-rear direction, the convex shape of the standing surface 4 as shown in FIGS. 6 and 7, and the horizontal width as shown in FIG. The shape of the wide and flat trap inlet 5 and the cross-sectional shape of the trap drainage channel 6 in which the filth rotation space 6b as shown in FIG. 12 is formed are not limited to the siphon flush toilet, It can also be used in direct-coupled direct-valve toilets and wash-out toilets that do not produce siphon action, and it is easy to collect dirt and washing water at the trap inlet 5 and ensure a structure that can be washed with less water. Become.

Next, in FIGS. 13-18, 2nd Example which is a modification of the part of the rising pipe 6P in a flush toilet is shown.
13 is an enlarged cross-sectional view of the riser pipe 6P of the trap drain 6 in FIG. 1, the LL cross section in FIG. 13 is shown in FIG. 14, the MM cross section is shown in FIG. 15, and the NN cross section. Is shown in FIG. 16, the OO cross section is shown in FIG. 17, and the PP cross section is shown in FIG.

  That is, FIG. 14, FIG. 15, FIG. 16, and FIG. FIG. 18 shows a cross-sectional shape perpendicular to the direction of drainage near the upstream side of the top 6a.

The inner peripheral surface of the rising pipe 6P includes a bottom surface 61 on the bottom side, rising surfaces 62 and 63 that rise in the vertical direction (vertical direction) on the left and right of the bottom surface 61, and a substantially mountain-shaped upper surface at the upper ends of the rising surfaces 62 and 63. 64, 65, 66 are formed continuously.
The upper surfaces 64, 65, 66 are formed with upper surface inclined portions 65, 66 facing the standing surfaces 62, 63 downward from the upper surface central portion 64 located at the central portion in the direction perpendicular to the direction of draining the washing water. In FIG. 14, the upper surface inclined portions 65 and 66 are formed in a curved inclined shape bulging into the trap drainage channel 6. In FIGS. 15, 16, and 17, the upper surface inclined portions 65 and 66 are formed to be inclined substantially linearly.
In FIG. 18, the height of the left and right standing surfaces 62, 63 is such that the height is maximum between the middle portion and the vicinity of the top portion 6a, and the rising end of the rising pipe 6P shown in FIG. The area is set to be the maximum area.
Note that the cross section perpendicular to the drain direction of the trap inlet 5 which is the upstream end of the ascending pipe 6P has a cross section as shown in FIG. 8, and the cross section of the top 6a of the trap drain 6 is shown in FIG. 9 and the same shape.

In addition, the wash water that flows in the direction of drainage from the upstream side toward the downstream side in the ascending pipe 6P becomes a fast flowing water along the arrow WS in FIG.
That is, at the trap inlet 5, the washing water that enters the lower side in the vertical direction in the cross section has a low flow rate and is likely to stagnate, but the upper part of the vertical direction in the cross section at the trap inlet 5 is fast because the water flow does not dive. The flow rate is maintained to flow into the ascending pipe 6P, and this fast water flow flows in the ascending pipe 6P toward the top 6a, so that it reaches from the middle part of the ascending pipe 6P to the ascending end just before the downstream top 6a. Then, the speed of the water flow on the lower side in the vertical direction in the cross section, that is, the bottom surface 61 side is high, and the water flow becomes slow on the upper side in the vertical direction in the cross section, and stagnation tends to occur. For this reason, the cross-sectional shape as shown in FIGS. 14 to 18 is set so that the water flow rate is maintained well in the ascending pipe 6P and the washing water flows smoothly without pressure loss.

As described above, since the flow rate of the cleaning water above the vertical center of the cross section is high at the trap inlet 5, the shape as shown in FIG. 8 is formed so that the area above the vertical center of the cross section is larger than the lower side. A high flow rate is ensured, and the area above the center in the vertical direction of the cross section is widened and the area on the bottom is narrowed from the trap inlet 5 to the middle part of the riser pipe 6P. .
In addition, since the flow rate of the washing water below the center in the longitudinal direction of the cross section is higher from the middle portion of the ascending pipe 6P to the upstream end of the downstream top portion 6a, the lower side from the vertical center of the cross section is higher than the upper side. In order to obtain a large area, the area below the center in the longitudinal direction of the cross section is widened, and the area on the upper side is narrowed down (see FIGS. 14, 15, 16, 17, and 18).

In this manner, the area through which the fast-flowing water stream WS passes in the ascending pipe 6P is widened, and conversely, the area of the other part is narrowed to eliminate stagnation so that the washing water flows smoothly.
That is, in FIGS. 14 to 18, the upper surface inclined portions 65 and 65 are formed downward from the upper surface central portion 64 to the left and right so that the lower side from the vertical center of the cross section is larger than the upper side, and the upper area is reduced. It was narrowed.
In addition, in this portion, the bottom surface 61 side is formed to be a substantially flat surface extending in a direction perpendicular to the direction of draining the washing water, so that a large amount of fast water flows along the bottom surface 61.

In addition, as shown in FIG. 18, the height of the rising surfaces 62 and 63 is increased at the rising end of the rising pipe 6P, and the area of this portion is widened so that the filth is easy to rotate. It is possible to reliably prevent clogging of filth at the part.
In FIG. 18 as well, the upper surface side is narrowed to a substantially mountain shape, the flow rate of the cleaning water on the upper surface side is increased, and clogging of filth can be satisfactorily eliminated.

DESCRIPTION OF SYMBOLS 1 Siphon type flush toilet 2 Toilet bowl main body 3 Bowl surface 3a Recessed part 4 Standing surface 4a Upward inclined surface (Ru part)
5 trap inlet 5a introduction passage 6 trap drainage channel 6P trap drainage channel 6a top 6b filth rotation space 7 drainage port 8 drainage socket 8a throttle 9 rim 9a rim waterway 10 distributor 10a first outlet 10b second Outlet 11a 1st outlet 11b 2nd outlet 12 Washing stage 61 Bottom 62, 63 Standing surface 64 Upper surface center part 65, 66 Upper surface inclined part W Reservoir surface R Earl part P Maximum width position

Claims (9)

In the flush toilet having a trap drainage channel inclined upward from the trap inlet toward the downstream side,
The upwardly inclined riser pipe of the trap drainage channel is formed so that the vertical dimension of the cross section perpendicular to the drainage direction of the washing water increases from the trap inlet toward the downstream side,
The flush toilet, wherein the trap entrance is opened in a shape having a width dimension larger than a length dimension. The flush toilet according to claim 1, wherein a tubular introduction passage is provided in front of the trap entrance, and the drainage channel is inclined downward toward the rear of the toilet. In a cross section perpendicular to the direction of the drainage channel in the upstream portion near the trap inlet,
The rounded part connecting the standing surfaces on both sides of the bottom
The curvature radius of the rounded portion in which the flow of the swirling flow in the cross-sectional direction is directed from the standing surface to the bottom surface is smaller than the curvature radius of the rounded portion from the bottom surface to the standing surface. Flush toilet. The cross-sectional shape perpendicular to the direction of washing water drainage in the riser is
From the trap inlet to the downstream intermediate part, the upper side from the longitudinal center of the cross section is formed in a shape having a larger area than the lower side,
4. The method according to claim 1, wherein the intermediate portion is formed in a shape in which the lower side from the longitudinal center of the cross section has a larger area than the upper side in the vicinity of the upstream side of the top portion on the downstream side. Flush toilet bowl. A rising surface rising in the vertical direction is formed on the inner peripheral side surface of the rising pipe between the intermediate portion and the vicinity of the upstream side of the top portion, and the height of the rising surface is the maximum height in the vicinity of the upstream side of the top portion. The flush toilet bowl according to claim 4, wherein the flush toilet bowl is set to be. The water washing according to any one of claims 1 to 5, wherein a bottom surface constituting an inner peripheral surface of the rising pipe is formed in a substantially flat surface extending in a direction perpendicular to a direction of draining the washing water. Toilet bowl. The filth rotation space is formed near the upstream side of the top of the trap drainage channel by inflating the upper surface side of the inner periphery of the trap drainage channel. The flush toilet according to the description. The upper surface constituting the inner peripheral surface of the rising pipe is formed in a substantially mountain shape that is downwardly directed to the left and right from the central portion in the direction perpendicular to the draining direction of the washing water. A flush toilet according to any one of the above.   The flush toilet according to any one of claims 1 to 8, wherein the flush toilet is a siphon toilet.

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