JP6804046B2 - Flush toilet - Google Patents

Description

The present invention is related to a flush toilet, and in particular, it is possible to suppress the occurrence of stagnation by reducing the region where the flow velocity is slow in the introduction pipe of the drainage pipe, and to reliably discharge small filth and floating filth. Regarding flush toilets that can be done.

Conventionally, for example, as described in Patent Document 1, in a bowl portion provided with a recess formed below the filth receiving surface, the washing water discharged from the rim spout is swirled along the rim water passage. There is known a flush toilet that discharges filth from the front of the bowl surface to the entrance of the introduction pipe of the drain pipe toward the rear. In such a flush toilet, an introduction pipe that opens upward and extends rearward and downward is provided in order to facilitate the flow of washing water into the inlet of the introduction pipe of the drainage pipe.

Japanese Unexamined Patent Publication No. 2011-174363

However, in the flush toilet of Patent Document 1 described above, the mainstream of water discharged from the rim spout and flowing from the front to the rear flows vigorously into the introduction pipe of the drainage pipe, so that the rear region of this introduction pipe is used. On the other hand, the flow velocity of the wash water flowing into the front area of the introduction pipe becomes slow, which causes stagnation in the front area and hinders the smooth flow in the drainage pipe. There is a problem that it ends up.
In addition, the smooth flow in the drainage pipe is hindered in this way, the velocity distribution in the front region and the rear region is biased, and if the velocity distribution is not uniform, small filth and floating filth will not be discharged and will accumulate. There is a problem that it remains in the water.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and suppresses the occurrence of stagnation by reducing the region where the flow velocity is slow in the introduction pipe of the drainage pipe, and small filth. The purpose is to provide a flush toilet that can reliably discharge floating filth.

In order to achieve the above-mentioned object, the present invention is a water-washing stool that cleans the toilet body with the washing water supplied from the water supply source and discharges filth, and is a sewage receiving surface and a rim located on the upper edge. A bowl portion having a portion and a recess formed below the filth receiving surface, and the washing water is discharged toward the front of the bowl portion and unidirectionally along the inner peripheral surface of the rim portion. It has a rim water discharge part that forms a swirling swirling flow, and a drainage pipe whose inlet is connected to the recess of the bowl portion to discharge filth, and the recess of the bowl portion is located below the accumulated water level. The drainage pipe is provided with a bottom surface and a wall surface connecting the bottom surface and the lower edge portion of the filth receiving surface, and the drainage pipe is connected to the bottom surface of the recess and extends rearward and downward. A rising pipe connected to the introduction pipe and extending upward, and a descending pipe connected to the rising pipe and extending downward are provided, and the rim water discharge portion is located behind the front bottom surface of the recess. The introduction pipe is provided with a water spout forming a main stream that flows from the front side of the bowl portion toward the inlet of the introduced introduction pipe, and the introduction pipe is in the front-rear direction and the left-right direction of the cross section of the introduction pipe. A central axis that passes through the center of the pipe and is orthogonal to each of the cross sections, and extends from the inlet connected to the bottom surface of the recess to the outlet connected to the rising pipe, in the front region with respect to the central axis. The cross-sectional area is formed to be smaller than the cross-sectional area of the rear region with respect to the central axis, and the bottom surface and the upper surface of the introduction pipeline extend rearward and downward from the upstream side to the downstream side. ..
In the present invention configured as described above, the washing water discharged from the rim water discharge portion toward the front forms a main stream that flows from the front side of the bowl portion toward the inlet of the drainage pipe. At this time, the introduction pipe of the drainage pipe has a central axis that passes through the center of each of the front-rear and left-right directions of the cross-section of the introduction pipe and is orthogonal to each of the cross-sections. The cross-sectional area of the front region with respect to the central axis of the introduction pipe is the cross-sectional area of the rear region with respect to the central axis of the introduction pipe from the inflow port connected to the bottom surface of the recess to the outlet connected to the rising pipe. Since the bottom surface and the upper surface of the introduction pipe extend rearward and downward from the upstream side to the downstream side, the washing water flows directly from the front side of the bowl portion after the introduction pipe. It is possible to reduce the cross-sectional area of the front region of the introduction pipeline where the flow velocity is slower than that of the side region and small filth and floating filth are likely to accumulate. Therefore, it is possible to reduce the region where the flow velocity is slow in the introduction pipe, and it is possible to suppress the occurrence of stagnation. In addition, since the cross-sectional area of the front region of the introduction pipe where the flow velocity is slow and small filth and floating filth are likely to accumulate becomes small, the washing water directly flows in from the front side of the bowl portion after the introduction pipe. The flow velocity distribution of the wash water becomes uniform (the velocity distribution of the wash water becomes uniform) in each of the side region and the front region of the introduction pipe, and the flow of the wash water in the drain pipe becomes smooth. Therefore, small filth and floating filth can be reliably discharged without staying in the front region of the introduction pipe.

In the present invention, preferably, the introduction pipeline is formed in a substantially U-shaped bottom surface in a cross section perpendicular to the central axis thereof.
In the present invention configured in this way, since the bottom surface of the introduction pipe is formed in a substantially U-shape, the floating filth in the introduction pipe is substantially crossed at a cross section perpendicular to the central axis of the introduction pipe. Since it can be collected in the center and a smooth flow can be formed in which the flow velocity distribution of the washing water in the introduction pipe is uniform, small filth and floating filth can be placed in the front area of the introduction pipe. It can be reliably discharged without staying.

In the present invention, preferably, the rising pipe of the drainage pipe is formed so that its cross-sectional area is larger than the smallest cross-sectional area of the introduction pipe.
In the present invention configured in this way, since the cross-sectional area of the rising pipe of the drainage pipe is formed to be larger than the smallest cross-sectional area of the introduction pipe, cleaning through the introduction pipe is performed. Water is drained smoothly along the rising pipeline. Therefore, small filth and floating filth can be reliably discharged without staying in the drainage pipe.

In the present invention, preferably, the upper surface of the ascending pipe of the drainage pipe has a peak at the boundary between the rising pipe and the descending pipe, and a siphon action is applied to a region above the vicinity of the apex. A predetermined space is formed to prevent the occurrence.
In the present invention formed in this way, the washing water that flows from the introduction pipe into the ascending pipe and rises in this rising pipe passes near the apex, which is the boundary between the rising pipe and the descending pipe. Then, when flowing to the descending pipeline, the occurrence of the siphon action can be suppressed by the predetermined space formed in the region above the vicinity of the apex. Therefore, the washing water that has passed through the ascending pipe is surely discharged to the descending pipe beyond the apex, and small filth and floating filth can be surely discharged without staying in the drainage pipe.

According to the flush toilet of the present invention, the occurrence of stagnation can be suppressed by reducing the region where the flow velocity is slow in the introduction pipe of the drainage pipe, and small filth and floating filth can be reliably discharged.

It is a top view which shows the flush toilet by one Embodiment of this invention. It is sectional drawing 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 sectional drawing seen along the line VII-VII of FIG. It is sectional drawing seen along the line VIII-VIII of FIG. FIG. 2 is an enlarged partially enlarged cross-sectional view of a flush toilet according to an embodiment of the present invention shown in FIG. 2, in which a recess in a bowl portion and a drainage pipe portion are enlarged. 10 (a) is a cross-sectional view taken along the line AA of FIG. 9, and FIG. 10 (b) is a cross-sectional view taken along the line BB of FIG. (C) is a cross-sectional view taken along the line CC of FIG. 9, and (d) of FIG. 10 is a cross-sectional view taken along the line DD of FIG. e) is a cross-sectional view taken along the line EE of FIG. 9, FIG. 10 (f) is a cross-sectional view taken along the line FF of FIG. 9, and (g) of FIG. Is a cross-sectional view taken along the line GG of FIG. It is a top view which shows the state of the flow of the flush water of the flush toilet according to the embodiment of this invention. FIG. 11 is a cross-sectional view of FIG.

Next, a flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 12.
FIG. 1 is a plan view showing a flush toilet according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is III of FIG. It is sectional drawing seen along line −III. Further, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 1, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 1, and FIG. 6 is a cross-sectional view taken along the line VV of FIG. It is sectional drawing seen along the VI-VI line of. Further, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 1, and FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG.

As shown in FIGS. 1 to 3, the water-washing toilet bowl 1 is a wash-off type toilet bowl in which filth is washed away by the action of running water due to the drop of water in the bowl portion, and the toilet bowl main body 2 and the washing water for washing the toilet bowl main body 2 are washed. It is equipped with a water storage tank 4 for storing water. The toilet bowl body 2 is made of earthenware having a glaze layer formed on its surface, a skirt portion 6 is formed at the lower portion, and a bowl portion 8 is formed at the front of the upper half. Further, a common water passage 10 whose upstream end communicates with the water storage tank 4 is formed in the rear upper portion of the bowl portion 8, and a drainage pipe 12 for discharging filth is further formed in the rear lower portion of the bowl portion 8. Has been done.

The water storage tank 4 described above is a washing water source, and a drain valve 14 is provided in the water storage tank 4 and is opened and closed by an operation lever (not shown). In this embodiment, it can be applied to a direct pressure flush toilet that does not have a water storage tank 4 and to which flush water is directly supplied from the tap water, a flush toilet of a type in which wash water is supplied by a flush valve, and the like. it can.

The bowl portion 8 has a bowl-shaped filth receiving surface 16 (details will be described later), a rim portion 18 located at the upper edge, and a recess 20 (details will be described later) formed below the filth receiving surface 16. I have. Here, as shown in FIGS. 2 to 7, the inner peripheral surface 18a of the rim portion 18 has a shape of overhanging inward so that the swirling washing water described later does not jump out to the outside. There is.

A first spout 22 (details will be described later) is formed on the slightly rear side of the central portion on the left side of the inner peripheral surface of the rim portion 18 of the bowl portion 8 when viewed from the front. A second spout 24 (details will be described later) is formed on the right rear side (downstream side). The first spout 22 and the second spout 24 swivel in the same direction (counterclockwise in FIG. 1) to form a swirling flow described later.

Further, the common waterway 10 formed in the upper rear part of the flush toilet 1 described above branches into a first waterway 26 and a second waterway 28 toward the front of the toilet bowl. The first water passage 26 is for supplying wash water to the first water spout 22, and the second water passage 28 is for supplying wash water to the second water spout 24.
In the flush toilet 1 of the present embodiment, the first water passage 26 including the first spout 22 and the second water passage 28 including the second spout 24 are integrated with the pottery body 2 made of earthenware. The formed form will be described, but the form is not limited to this, and the first water passage including the first spout and the second water channel including the second spout are separate from the toilet bowl body. It may be formed by a distributor or the like.

Here, as shown in FIGS. 2 to 7, the filth receiving surface 16 of the bowl portion 8 of the flush toilet bowl 1 according to the present embodiment is the entire area along a radial line toward the entrance of the drainage pipe line 12. In, it is formed in a convex shape upward.

Further, as shown in FIGS. 2 and 3, a headrace 30 for guiding the washing water is formed in the lower region of the inner peripheral surface 18a of the rim portion 18 of the bowl portion 8. The headrace 30 is for swirling the washing water discharged from the first spout 22 along the inner peripheral surface 18a of the rim portion 18, and is from the first spout 22 to the front end of the bowl portion 8. It gradually inclines downward (see FIG. 2), and gradually inclines upward from the front end toward the rear (see FIG. 3). Since the wash water discharged from the first spout 22 swirls along the headrace 30, it flows from the front side of the bowl portion 8 to be described later toward the inlet 32a of the introduction pipe 32 of the drainage pipe 12. It is possible to form the mainstream M of the flow rate (details will be described later).

Next, as shown in FIGS. 2 and 3, the drainage pipe 12 is connected to the bottom surface of the recess 20 and extends rearward and downward, and a drainage trap connected to the introduction pipe 32 and extending upward. It is provided with a pipeline 34. Further, the drain trap pipeline 34 is composed of an ascending pipeline 34a and a descending pipeline 34b.
The introduction pipe 32 is connected to the bottom surface 36 of the recess 20 as a smooth continuous curved surface, so that the washing water flowing into the introduction pipe 32 from the recess 20 smoothly flows in the introduction pipe 32. ..

Next, the recess 20 and the drainage pipe line 12 of the bowl portion 8 will be described in detail with reference to FIGS. 1 to 3, 9 and 10.
First, FIG. 9 is a partially enlarged cross-sectional view of a flush toilet according to an embodiment of the present invention shown in FIG. 2, in which a recess in a bowl portion and a drainage pipe portion are enlarged. Further, FIG. 10A is a cross-sectional view taken along the line AA of FIG. 9, and FIG. 10B is a cross-sectional view taken along the line BB of FIG. Yes, FIG. 10 (c) is a cross-sectional view taken along the line CC of FIG. Further, FIG. 10 (d) is a cross-sectional view taken along the line DD of FIG. 9, and FIG. 10 (e) is a cross-sectional view taken along the line EE of FIG. Yes, FIG. 10 (f) is a cross-sectional view taken along the line FF of FIG. 9, and FIG. 10 (g) is a cross-sectional view taken along the line GG of FIG. is there.

As shown in FIGS. 1 to 3 and 9, the recess 20 has a bottom surface 36 located below the accumulated water level W and a wall surface 38 connecting the bottom surface 36 and the lower edge portion of the filth receiving surface 16. I have. Further, the bottom surface 36 includes a front side bottom surface 40 formed in the front side region and a rear side bottom surface 42 formed in the rear side region.

The front bottom surface 40 of the bottom portion 36 of the recess 20 is formed horizontally. The front bottom surface 40 may be inclined downward toward the rear. Further, the front bottom surface 40 of the recess 20 is formed so that the entire region of this surface is located below the accumulated water level W and above the lower end 42a of the rear bottom surface 42.

The rear bottom surface 42 of the bottom portion 36 of the recess 20 is formed so as to face the front side region of the introduction pipe 32 and to incline downward toward the inside. Further, the rear bottom surface 42 of the recess 20 is formed so that the entire region of this surface is located below the accumulated water level W. The rear bottom surface 42 of the recess 20 does not have to be a flat surface, and may be formed by a curved surface that is slightly curved upward.

Further, as shown in FIG. 1, the wall surfaces 38a and 38b of the left and right side regions of the recess 20 are formed flush with the introduction pipe 32 of the drainage pipe 12. As a result, the bottom surface 36 is not formed in the left and right side regions of the recess 20. Further, the inlet 32a of the introduction pipe 32 of the drainage pipe 12 is located at the center in the front-rear direction thereof on the rear side of the center in the front-rear direction of the water reservoir surface S in a plan view.

Next, as shown in FIGS. 9 and 10 (a) to 10 (d), the introduction pipe 32 is the entrance of the rising pipe 34a of the drain trap pipe 34 from the inlet 32a connected to the bottom surface 36 of the recess 20. Central axes C1 and C2 that are perpendicular to each cross section in the AA cross section, BB cross section, CC cross section, and DD cross section of the introduction pipe 32 up to the outlet 32b connected to , C3, C4, the cross-sectional area A1, A2, A3, A4 is from the cross-sectional area B1, B2, B3, B4 of the inner peripheral area with respect to each central axis C1, C2, C3, C4. Is also formed to be small.
That is, the flow velocity is slower and smaller filth than the rear side region R of the inlet 32a of the introduction pipe 32 and the inner peripheral side region R of the introduction pipe 32 into which the washing water directly flows from the front side of the bowl portion 8. The cross-sectional area of the outer peripheral side region F is set to be smaller than the front side region F of the inlet 32a of the introduction pipe 32 and the central axis C1, C2, C3, C4 in the introduction pipe 32 where floating filth is likely to accumulate. Has been done. As a result, it is possible to reduce the region where the flow velocity is slow in the introduction pipe 32, and it is possible to suppress the occurrence of stagnation. Further, the cross-sectional area of the front side region F of the inlet 32a of the introduction pipe 32 and the outer peripheral side region F in the introduction pipe 32 is set small because the flow velocity is slow and small filth and floating filth are likely to stay. The rear side region R (inner peripheral side region R of the introduction pipe 32) of the introduction pipe 32 into which the washing water directly flows from the front side of the bowl portion 8 and the front side region F (introduction pipe) of the introduction pipe 32. In each region of the outer peripheral side region F) of 32, the flow velocity distribution of the wash water becomes uniform (the velocity distribution of the wash water becomes uniform), the flow of the wash water in the drainage pipe 12 becomes smooth, and the size is small. The filth and the floating filth can be reliably discharged without staying in the front region F of the introduction pipe 32.

Further, as shown in FIGS. 9 and 10 (a) to (d), the bottom surface 32c of the introduction pipeline 32 is a cross section of AA perpendicular to each of the central axes C1, C2, C3, and C4. It is formed in a substantially U-shape in the BB cross section, the CC cross section, and the DD cross section. As a result, the floating filth in the introduction pipe 32 is removed from the AA cross section, the BB cross section, the CC cross section and the DD cross section perpendicular to the central axes C1, C2, C3 and C4 of the introduction pipe 32. It can be collected almost in the center of the pipe, and a smooth flow can be formed in which the flow velocity distribution of the washing water in the introduction pipe 32 becomes uniform. Therefore, the small filth and the floating filth can be discharged more reliably without staying in the front side region F of the introduction pipe 32 (the outer peripheral side region F of the introduction pipe 32).

Further, as shown in FIGS. 9 and 10 (e) to 10 (g), the rising pipe 34a of the drain trap pipe 34 is a drain trap pipe 34 from the inlet 34c connected to the outlet 32b of the introduction pipe 32. The EE cross section of the ascending pipe 34a, FF, extending to the vicinity of the outlet 34d connected to the inlet of the descending pipe 34b, that is, to the vicinity of the boundary D1 between the ascending pipe 34a and the descending pipe 34b. In the cross section and the GG cross section, the cross-sectional areas A5, A6, and A7 of the outer peripheral region with respect to the central axes C5, C6, and C7 that are perpendicular to each cross section are relative to the central axes C5, C6, and C7. It is formed so as to be smaller than the cross-sectional areas B5, B6, and B7 of the inner peripheral region.
Further, as shown in FIGS. 9 and 10 (e) to 10 (g), the bottom surface 34e of the ascending pipe line 34a has each EE cross section perpendicular to each central axis C5, C6, C7, F-. It is formed in a substantially U-shape in the F cross section and the GG cross section.

Next, as shown in FIGS. 9 and 10 (a) to (g), the rising pipe 34a of the drain trap pipe 34 covers the entire region from the inlet 34c to the outlet 34d. The cross-sectional area of 34a is formed to be larger than the cross-sectional area of the BB cross-section, which is the smallest cross-sectional area of the introduction pipe 32. That is, each of the cross-sectional area of the EE cross section (A5 + B5), the cross-sectional area of the FF cross section (A6 + B6), and the cross-sectional area of the GG cross section (A7 + B7) of the rising pipeline 34a is the minimum of the introduction pipeline 32. It is set to be larger than the cross-sectional area of the BB cross section, which is the cross-sectional area. As a result, the washing water that has passed through the introduction pipe 32 is smoothly discharged along the rising pipe 34a.

Next, as shown in FIG. 9, the upper surface 34f of the ascending pipe 34a of the drain trap pipeline 34 has a boundary portion D1 between the ascending pipe 34a and the descending pipe 34b as a virtual apex P, and this apex P. The wall surface 34h extends to the rear end 34g located on the front side from the vicinity, and extends upward from the rear end 34g of the upper surface 34f of the rising pipe 34a. Further, on the rear side of the wall surface 34h, a wall surface 34i extending upward from the rear side wall surface of the descending pipeline 34b is formed so as to face each other, and the ceiling surface 34j is connected so as to connect the upper ends of the wall surfaces 34h and 34i. Is formed. These wall surfaces 34h, 34i and ceiling surface 34j are spaces V for preventing the occurrence of siphon action in the rear end 34g of the upper surface 34f of the rising pipe 34a and the region above the boundary portion D1. Is forming. The space V for preventing the occurrence of the siphon action allows the washing water flowing into the rising pipe 34a to surely rise to the rear end 34g of the upper surface 34f of the rising pipe 34a without flowing back to the front side. When passing through the rear end 34g of the upper surface 34f of the ascending pipe 34a, the space V for preventing the occurrence of the siphon action does not cause the siphon action, but passes near the apex P to surely reach the descending pipe 34b. It is designed to be discharged.

Next, the washing operation in the flush toilet according to the present embodiment will be described with reference to FIGS. 1 to 12.
FIG. 11 is a plan view showing the flow of flush water in a flush toilet according to the embodiment of the present invention, and FIG. 12 is a cross-sectional view of FIG.

First, when the user operates the operation lever of the water storage tank 4, the drain valve 14 opens, the washing water in the water storage tank 4 flows into the common water passage 10, and the first water passage 26 branched from the common water passage 10. Washing water is discharged from the first spout 22 and the second spout 24, respectively, through the second water passage 28.

The wash water discharged from the first spout 22 first flows forward along the headrace 30 formed on the inner peripheral surface 18a of the rim portion 18 of the bowl portion 8, and then flows forward, and is the front end of the bowl portion 8. After passing through, it flows backward. At this time, a part of the washing water drops the bowl portion 8 while swirling to wash the filth receiving surface 16.

A considerable amount of wash water discharged from the first spout 22 and flowing along the headrace 30 is a large flow rate mainstream M flowing from the front side of the bowl portion 8 toward the inlet 32a of the introduction pipe 32 of the drainage pipe 12. (See FIG. 11). A part of the flow M1 of the main stream M collides with the rear bottom surface 42 of the bottom surface 36 of the recess 20, and then flows out diagonally downward and forward toward the front region in the introduction pipe 32 (see FIG. 12). Further, a part of the other flow M2 of the mainstream M directly flows into the inlet 32a of the introduction pipe 32 (see FIG. 12).

Here, in the present embodiment, a headrace 30 is formed for the wash water to swirl along the inner peripheral surface of the rim portion 18, and the headrace 30 is from the first spout 22 to the front end of the bowl portion 8. Since it is formed so as to gradually incline downward toward the front end and gradually incline upward from the front end toward the rear side, a large flow rate mainstream M can be formed.

Further, in the present embodiment, since the entire area of the filth receiving surface 16 of the bowl portion 8 is formed in an upward convex shape, the washing water flowing through the filth receiving surface 16 is smoothly collected at the inlet 32a of the introduction pipe 32. This allows the flow of wash water in the introduction line 32 to be smooth.

Further, the washing water discharged from the first spout 22 toward the front forms a mainstream M that flows from the front side of the bowl portion 8 toward the inlet 32a of the introduction pipe 32, and a part M1 of the mainstream M is formed. It collides with the rear bottom surface 42 of the bottom surface 36 of the recess 20, and a part M1 of the collided mainstream flows toward the front region in the introduction pipe 32. In particular, since the rear bottom surface 42 of the bottom surface 36 is formed so as to incline downward toward the inside, a part of the mainstream flow M1 that collides with the rear bottom surface 42 is introduced into the front side region of the introduction pipe line 32. Can be guided smoothly toward. Further, a part of the main stream M2 of the washing water flows into the rear region in the introduction pipe 32.

As a result, the cleaning that collides with the rear side region R (inner peripheral side region R of the introduction pipe 32) of the introduction pipe 32 into which the washing water directly flows from the front side of the bowl portion 8 and the rear bottom surface 42 of the bottom surface 36. In the front side region F of the introduction pipe 32 into which water flows (the outer peripheral side region F of the introduction pipe 32), the flow velocity distribution of the washing water becomes uniform (the velocity distribution becomes uniform), that is, the introduction pipe 32 Since stagnation does not occur in the front region of the introduction pipe 32, the flow of the washing water in the introduction pipe 32 becomes smooth, so that small filth and floating filth do not stay in the front region of the introduction pipe 32. , Can be reliably discharged.

Further, since the introduction pipe 32 of the drain pipe 12 is connected to the bottom surface 36 of the recess 20 and has substantially the same diameter (almost the same cross-sectional shape) and is formed so as to extend rearward and downward, the washing water can be smoothly flowed. It can be introduced into the introduction pipe 32, and as a result, small filth and floating filth can be reliably discharged.

On the other hand, the washing water discharged from the second spout 24 drops the bowl portion 8 while swirling, and cleans the rear region of the filth receiving surface 16. Further, the washing water discharged from the second spout 24 forms a flow M3 that flows into the recess 20 from the rear (see FIG. 12). The flow M3 of the washing water of the second spout 24 flows toward the front bottom surface 40 of the bottom surface 36 of the recess 20.

At this time, since the front bottom surface 40 of the recess 20 is formed substantially horizontally, the flow M3 of the washing water discharged from the second spout 24 collides with the front bottom surface 40, rises, and flows above the front bottom surface 40. It is mixed with the mainstream M1 and M2. As a result, the filth is effectively agitated and smoothly flows into the introduction pipe 32.

At this time, the washing water flowing into the inlet 32a of the introduction pipe 32 has a slow flow velocity and tends to retain small filth and floating filth in the front region F of the inlet 32a of the introduction pipe 32 and the outer circumference in the introduction pipe 32. Since the cross-sectional area of the side region F is set small, the rear side region R of the introduction pipe 32 (the inner peripheral side region R of the introduction pipe 32) into which the washing water directly flows from the front side of the bowl portion 8 ) And the front side region F of the introduction pipe 32 (the outer peripheral side region F of the introduction pipe 32), the flow velocity distribution of the washing water becomes uniform and flows smoothly in the introduction pipe 32.

Further, when the washing water is flowing in the introduction pipe 32 with a uniform flow velocity distribution, the bottom surface 32c of the introduction pipe 32 is formed in a substantially U-shape, so that the inside of the introduction pipe 32 is formed. In a state where the floating filth is collected in the center of the AA cross section, the BB cross section, the CC cross section and the DD cross section perpendicular to the central axes C1, C2, C3 and C4 of the introduction pipe 32. , A smooth flow M4 to the rising line 34a is formed. As a result, small filth and floating filth are discharged to the ascending pipe 34a without staying in the front side region F of the introduction pipe 32 (the outer peripheral side region F of the introduction pipe 32).

Further, since the ascending line 34a is formed so that the cross-sectional area is larger than the smallest cross-sectional area (A2 + B2) of the introduction line 32 over the entire area, the ascending line 34a from the introduction line 32 The wash water containing small filth and floating filth that has flowed into the water forms a flow M5 that smoothly rises in the rising pipe 34a toward the falling pipe 34b.

Next, the wash water that flows from the introduction pipe 32 into the ascending pipe 34a and rises in the ascending pipe 34a passes near the apex P that is the boundary portion D1 between the ascending pipe 34a and the descending pipe 34b. To form a flow M6 to the descending pipeline 34b. At this time, the occurrence of the siphon action is suppressed by the space V for preventing the occurrence of the siphon action formed in the region above the vicinity of the apex P. As a result, the flow M5 of the washing water that has risen in the rising pipe 34a can surely rise to the rear end 34g of the upper surface 34f of the rising pipe 34a without flowing back to the front side, and the rising pipe 34a When passing through the rear end 34g of the upper surface 34f of the above surface, a flow M6 that passes near the apex P and is surely discharged to the descending pipe line 34b is formed. As a result, the small filth and the floating filth are surely discharged to the descending pipe 34b without staying in the front region F of the introduction pipe 32.

According to the flush toilet 1 according to the embodiment of the present invention described above, the flush water discharged from the first spout 22 toward the front is discharged from the front side of the bowl portion 8 to the introduction pipe 32 of the drain pipe 12. It forms a mainstream M that flows toward the inlet 32a of the. At this time, the introduction pipe 32 of the drainage pipe 12 extends from the inlet 32a connected to the bottom surface 36 of the recess 20 of the bowl portion 8 to the outlet 32b connected to the rising pipe 34a, and is at the center of each of the introduction pipes 32. Central axes C1, C2, C3, C4 that are perpendicular to each cross section in the AA cross section, BB cross section, CC cross section, and DD cross section that are perpendicular to the axes C1, C2, C3, and C4. The cross-sectional area A1, A2, A3, A4 of the outer peripheral side region is smaller than the cross-sectional area B1, B2, B3, B4 of the inner peripheral side region with respect to each central axis C1, C2, C3, C4. Is formed in. Therefore, the flow velocity is slower and smaller filth than the rear side region R of the inlet 32a of the introduction pipe 32 and the inner peripheral side region R of the introduction pipe 32 into which the washing water directly flows from the front side of the bowl portion 8. It is possible to reduce the cross-sectional area of the front side region F of the inlet 32a of the introduction pipe 32 and the outer peripheral side region F in the introduction pipe 32 where the floating filth is likely to accumulate. Therefore, the region where the flow velocity is slow in the introduction pipe 32 can be reduced, and the occurrence of stagnation can be suppressed. Further, the cross-sectional area of the front side region F of the inlet 32a of the introduction pipe 32 and the outer peripheral side region F in the introduction pipe 32 is set to be small because the flow velocity is slow and small filth and floating filth are likely to stay. The rear side region R (inner peripheral side region R of the introduction pipe 32) of the introduction pipe 32 into which the washing water directly flows from the front side of the bowl portion 8 and the front side region F (introduction pipe) of the introduction pipe 32. In each region of the outer peripheral side region F) of 32, the flow velocity distribution of the wash water becomes uniform, the velocity distribution of the wash water becomes uniform, and the flow of the wash water in the drainage pipe 12 becomes smooth, so that the size is small. The filth and floating filth can be reliably discharged without staying in the front region of the introduction pipe 32.

Further, according to the flush toilet bowl 1 according to the present embodiment, since the bottom surface 32c of the introduction pipe 32 is formed in a substantially U-shape, the floating filth in the introduction pipe 32 is removed from each of the introduction pipes 32. It can be collected almost in the center of the AA cross section, BB cross section, CC cross section and DD cross section perpendicular to the central axis C1, C2, C3 and C4, and the wash water in the introduction pipe 32 can be collected. A smooth flow with a uniform flow velocity distribution can be formed. Therefore, small filth and floating filth can be reliably discharged without staying in the front side region F of the introduction pipe 32 (the outer peripheral side region F of the introduction pipe 32).

Further, according to the flush toilet 1 according to the present embodiment, the cross-sectional area of the rising pipe 34a of the drainage pipe 12 is the smallest cross-sectional area (A2 + B2) of the introduction pipe 32 over the entire area of the rising pipe 34a. Since it is formed so as to be larger than the above, the washing water that has passed through the introduction pipe 32 is smoothly discharged along the rising pipe 34a. Therefore, small filth and floating filth can be reliably discharged without staying in the drainage pipe 12.

Further, according to the flush toilet 1 according to the present embodiment, the flush water that flows from the introduction pipe 32 into the ascending pipe 34a and rises in the ascending pipe 34a flows into the ascending pipe 34a and the descending pipe 34b. When flowing to the descending pipeline 34b through the vicinity of the apex P which is the boundary portion D1, the occurrence of the siphon action is suppressed by the space V for preventing the occurrence of the siphon action formed in the region above the vicinity of the apex P. can do. Therefore, the washing water that has passed through the ascending pipe 34a is surely discharged to the descending pipe 34b beyond the apex P, and small filth and floating filth are surely discharged without staying in the drainage pipe 12. be able to.

In the flush toilet 1 according to the present embodiment described above, a flush toilet has been described as an example, but the siphon action is used to suck in the filth in the bowl portion and to the outside at once from the drain trap pipeline. It may be a so-called siphon type flush toilet that is discharged to the toilet.

Further, in the flush toilet 1 according to the above-described embodiment, the washing water is discharged from the first spout 22 and the second spout 24, but the present invention is not limited to this, and only the first spout is used. It is also possible to spout water from the water and omit the second spout. In this case, since the amount of washing water discharged from the first spout can be increased, a part of the washing water discharged from the first spout swirls to the rear of the bowl portion and moves from the rear to the recess. It can invade and is substantially the same as when water is discharged from the second spout.

1 Flush toilet 2 Toilet bowl body 4 Water storage tank 6 Toilet bowl body skirt part 8 Toilet bowl body bowl part 10 Common water passage 12 Drainage pipe 14 Drain valve 16 Waste receiving surface 16a Rear side filth receiving surface 16b Front side filth receiving surface 18 Rim part 18a Inner peripheral surface 20 Recessed 22 First spout (rim spout)
24 Second spout (rim spout)
26 1st waterway 28 2nd waterway 30 Headrace 32 Introductory pipe 32a Introductory pipe inlet (introductory pipe inflow)
32b Introductory pipeline outlet (introductory pipeline outlet)
32c Bottom of the introduction line 34 Drainage trap line 34a Up line 34b Down line 34c Inlet of the up line 34d Outlet of the up line 34e Bottom of the up line 34f Top surface of the up line 34g Top surface of the up line Rear end 34h Wall surface 34i Wall surface 34j Ceiling surface 36 Bottom surface 38 Wall surface 38a Left side wall surface 38b Right side wall surface 40 Front side bottom surface 42 Rear side bottom surface 42a Lower end A1 Cross-sectional area of the outer peripheral side area with respect to the central axis in the AA section of the introduction pipeline A2 Cross-sectional area of the outer peripheral region with respect to the central axis in the BB cross section of the introduction pipeline A3 Cross-sectional area of the outer peripheral region with respect to the central axis in the CC cross section of the introduction pipeline A4 DD cross-section of the introduction pipeline Cross-sectional area of the outer peripheral side region with respect to the central axis in A5 Cross-sectional area of the outer peripheral side region with respect to the central axis in the EE cross section of the rising pipe A6 Outer peripheral side with respect to the central axis in the FF cross section of the rising pipe Cross-sectional area of the area A7 Cross-sectional area of the outer peripheral area with respect to the central axis in the GG cross section of the ascending line B1 Cross-sectional area of the inner peripheral side area with respect to the central axis in the AA cross section of the introduction line B2 Introducing pipe Cross-sectional area of the inner peripheral region with respect to the central axis in the BB cross section of the road B3 Cross-sectional area of the inner peripheral region with respect to the central axis in the CC cross section of the introduction pipeline B4 DD cross-section of the introduction pipeline Cross-sectional area of the inner peripheral side region with respect to the central axis in B5 Cross-sectional area of the inner peripheral side region with respect to the central axis in the EE cross section of the rising pipe B6 With respect to the central axis in the FF cross section of the rising pipe Cross-sectional area of the inner peripheral region B7 Cross-sectional area of the inner peripheral region with respect to the central axis in the GG cross section of the ascending pipeline C1 Central axis of the AA cross section of the introduction pipeline C2 BB cross section of the introduction pipeline Central axis of C3 Central axis of CC section of introduction pipeline C4 Central axis of DD section of introduction pipeline C5 Central axis of EE section of drainage trap pipeline C6 Central axis of drainage trap pipeline Central axis of FF cross section of rising pipeline C7 Central axis of GG cross section of drainage trap pipeline D1 Boundary between ascending pipeline and descending pipeline F Front area of introduction pipeline, introduction pipe Outer area of the road M Mainstream of wash water spouted from the first spout M1 Part of the main stream of wash water spouted from the first spout M2 Other mainstream of wash water spouted from the first spout Partial M3 Mainstream of wash water discharged from the 2nd spout M4 Flowing in the introduction pipe M5 Flowing in the rising pipe M6 Down from the rising pipe Flow to the down pipe P Virtual apex R Rear area of the introduction pipe, inner circumference side area of the introduction pipe S Reservoir surface V Space for preventing the occurrence of siphon action W Reservoir water level

Claims (4)

A flush toilet that cleans the toilet body with wash water supplied from the water supply source and discharges filth.
A bowl portion having a filth receiving surface, a rim portion located on the upper edge, and a recess formed below the filth receiving surface.
A rim water discharge portion that discharges the washing water toward the front of the bowl portion and forms a swirling flow that swirls in one direction along the inner peripheral surface of the rim portion.
It has a drainage pipe whose inlet is connected to the recess of the bowl portion and discharges filth.
The recess of the bowl portion includes a bottom surface located below the accumulated water level and a wall surface connecting the bottom surface and the lower edge portion of the filth receiving surface.
The drainage pipe is connected to the bottom surface of the recess and extends rearward and downward, an ascending pipe connected to the introduction pipe and extending upward, and connected to the ascending pipe and downward. With a descending pipeline that extends to
The rim spouting portion includes a spouting port that forms a mainstream flowing from the front side of the bowl portion toward the inlet of the introduction pipe formed behind the front bottom surface of the recess.
The introduction pipeline has a central axis that passes through the center of each of the cross sections of the introduction pipeline in the front-rear direction and the left-right direction and is orthogonal to each of the cross sections, and is an inflow port that connects to the bottom surface of the recess. The cross-sectional area of the front region with respect to the central axis is formed smaller than the cross-sectional area of the rear region with respect to the central axis from to the outlet connected to the ascending pipe, and the bottom surface and the upper surface of the introduction pipe are formed. A flush toilet that extends backward and downward from the upstream side to the downstream side. The flush toilet according to claim 1, wherein the introduction pipe has a bottom surface formed in a substantially U-shape in a cross section perpendicular to the central axis. The flush toilet according to claim 1 or 2, wherein the rising pipe of the drainage pipe is formed so that its cross-sectional area is larger than the smallest cross-sectional area of the introduction pipe. The upper surface of the ascending pipe of the drainage pipe has the boundary portion between the ascending pipe and the descending pipe as an apex, and a predetermined region above the apex for preventing the occurrence of siphon action. The flush toilet according to claim 3, wherein a space is formed.

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