JP2015067955A - Water closet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water closet capable of surely discharging a small dirt and a floating system dirt, by restraining the occurrence of stagnation, by reducing a slow area of a flow speed in an introduction pipe conduit of a drainage pipe conduit.SOLUTION: A water closet 1 by the present invention comprises: a bowl part 8 having a dirt receiving surface 16, a rim part 18 and a recessed part 20; a water discharge part 22 for discharging wash water forward and turning along an inner peripheral surface of the rim part; and a drainage pipe conduit 12 for discharging the dirt. The drainage pipe conduit comprises: the introduction pipe conduit 32 connected to a bottom surface 36 of the recessed part and extending downward to the rear side; a rising pipe conduit 34a connected to this introduction pipe conduit and extending upward; and a lowering pipe conduit 34b connected to this rising pipe conduit and extending downward. The introduction pipe conduit is formed so that the cross-sectional area of an outer peripheral side area of the introduction pipe conduit becomes smaller than the cross-sectional area of an inner peripheral side area to this central axis in a right-angled cross section to the central axis C1-C4 of the introduction pipe conduit over up to an outlet 32b connected to the rising pipe conduit from an inlet 32a connected to the bottom surface of the recessed part.

Description

  The present invention relates to flush toilets, and in particular, by reducing the area of low flow velocity in the introduction pipe of the drainage pipe, it is possible to suppress the occurrence of stagnation and reliably discharge small filth and floating filth. It relates to a flush toilet.

  Conventionally, for example, as described in Patent Document 1, in the bowl portion having a recess formed below the filth receiving surface, the wash water discharged from the rim spout is swung along the rim water passage. A flush toilet that discharges filth from the front of the bowl surface to the inlet of the introduction pipe of the drainage pipe is known. Such flush toilets are provided with an introduction pipe that opens upward and extends rearward and downward in order to facilitate the flow of washing water into the inlet of the introduction pipe of the drainage pipe.

JP 2011-174363 A

However, in the flush toilet of Patent Document 1 described above, the main stream discharged from the rim spout and flowing from the front to the rear vigorously flows into the introduction pipe of the drain pipe, so that the rear region of the introduction pipe However, on the other hand, since the flow rate of the wash water flowing into the front area of the introduction pipe line becomes slow, stagnation occurs in the front area and the smooth flow in the drain pipe is obstructed. There is a problem that it ends up.
In addition, the smooth flow in the drainage pipe is obstructed in this way, the speed distribution in the front area and the rear area is uneven, and if the speed distribution is not uniform, small filth and floating filth are not discharged and stored. There is a problem that it remains in the water.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and reduces the occurrence of stagnation by reducing the area where the flow velocity in the introduction pipe of the drainage pipe is slow, thereby reducing the size of the filth. The purpose of the present invention is to provide a flush toilet that can reliably discharge floating sewage.

In order to achieve the above-described object, the present invention is a flush toilet that flushes a toilet body with washing water supplied from a water supply source and discharges waste, and includes a waste receiving surface and a rim located at an upper edge. And a bowl portion provided with a recess formed below the filth receiving surface, and a swirl that discharges the cleaning water toward the front of the bowl portion and swirls along the inner peripheral surface of the rim portion. A rim water spouting part that forms a flow, and a drain pipe that is connected to the concave part of the bowl part and discharges filth, and the concave part of the bowl part has a bottom surface that is positioned below the level of the stored water A wall surface connecting the bottom surface and the lower edge of the filth receiving surface, the drainage pipe connected to the bottom surface of the concave portion and extending rearward and downward, and the introduction pipe A rise pipe that is connected to the road and extends upward; And the bowl part is configured to form a main flow in which the wash water discharged from the water discharge part flows from the front side of the bowl part toward the inlet of the drain pipe. The introduction pipe line extends from the inlet connected to the bottom surface of the recess to the outlet connected to the rising pipe, in a cross section perpendicular to the central axis of the introduction pipe, The cross-sectional area of the outer peripheral side region of the introduction pipe line is formed so as to be smaller than the cross-sectional area of the inner peripheral side region.
In the present invention configured as described above, the wash water discharged forward from the rim water discharge portion forms a main flow that flows from the front side of the bowl portion toward the inlet of the drain pipe. At this time, in the cross section perpendicular to the central axis of the introduction pipe, the introduction pipe of the drain pipe extends from the inlet connected to the bottom surface of the recess of the bowl portion to the outlet connected to the rising pipe. Since the cross-sectional area of the outer peripheral side area of the introduction pipe line is smaller than the cross-sectional area of the inner peripheral side area with respect to the central axis, the introduction of cleaning water directly from the front side of the bowl portion Compared to the rear area of the pipeline, the cross-sectional area of the front area of the introduction pipeline can be reduced because the flow rate is low and small filth and floating filth are likely to stay. Therefore, the area | region where the flow velocity in an introduction pipe line is slow can be reduced, and generation | occurrence | production of a stagnation can be suppressed. In addition, by reducing the cross-sectional area of the front area of the introduction pipe line where the flow rate is low and small filth and floating filth are likely to stay, the back of the introduction pipe line where the washing water flows directly from the front side of the bowl part is reduced. In each of the side area and the front area of the introduction pipe line, the flow rate distribution of the wash water becomes uniform (the speed distribution of the wash water is made uniform), 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 area of the introduction pipe line.

In the present invention, preferably, the introduction conduit has a substantially U-shaped bottom surface in a cross section perpendicular to the central axis.
In the present invention configured as described above, since the bottom surface of the introduction pipe line is formed in a substantially U-shape, the floating filth in the introduction pipe line is substantially in a cross section perpendicular to the central axis of the introduction pipe line. As well as being able to collect in the center and form a smooth flow with a uniform flow rate of the washing water in the introduction pipe, small filth and floating filth can be placed in the front area of the introduction pipe. It can be reliably discharged without being retained.

In the present invention, preferably, the rising pipe of the drain 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 as described above, 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, so that the washing that has passed through the introduction pipe is performed. Water is drained smoothly along the ascending pipeline. Therefore, small filth and floating filth can be reliably discharged without being retained in the drain pipe.

In the present invention, preferably, the upper surface of the ascending pipeline of the drainage pipeline has a boundary between the ascending pipeline and the descending pipeline as an apex, and a region above the apex has a siphon action. A predetermined space for preventing the occurrence is formed.
In the present invention thus formed, the wash water that flows into the rising pipe from the introduction pipe and rises through the rising pipe passes through the vicinity of the apex, which is the boundary between the rising pipe and the down pipe. Then, when flowing to the descending pipeline, the occurrence of siphon action can be suppressed by the predetermined space formed in the region above the apex. Therefore, the wash water that has passed through the ascending pipeline is reliably discharged to the descending pipeline beyond the apex, and the small filth and the floating filth can be reliably discharged without being retained in the drainage pipeline.

  According to the flush toilet of the present invention, it is possible to suppress the occurrence of stagnation by reducing the region where the flow velocity in the introduction pipe of the drain pipe is slow, and to reliably discharge small filth and floating filth.

It is a top view which shows the flush toilet bowl by one Embodiment of this invention. It is sectional drawing seen along the II-II line of FIG. It is sectional drawing seen along the III-III line 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 VII-VII line of FIG. It is sectional drawing seen along the VIII-VIII line of FIG. FIG. 3 is a partial enlarged cross-sectional view in which a recessed portion of a bowl portion and a drain pipe portion are enlarged in the flush toilet according to the embodiment of the present invention shown in FIG. 2. 10A is a cross-sectional view taken along the line AA in FIG. 9, and FIG. 10B is a cross-sectional view taken along the line BB in FIG. (C) of FIG. 10 is a cross-sectional view taken along the line CC of FIG. 9, and FIG. 10 (d) is a cross-sectional view taken along the line DD of FIG. e) is a cross-sectional view taken along line EE in FIG. 9, and FIG. 10 (f) is a cross-sectional view taken along line FF in FIG. 9, and FIG. FIG. 10 is a cross-sectional view taken along line GG in FIG. 9. It is a top view which shows the mode of the flow of the washing water of the flush toilet by embodiment of this invention. It is sectional drawing of FIG.

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

  As shown in FIGS. 1 to 3, the flush toilet 1 is a flush toilet that flushes filth by flowing water caused by a water drop in the bowl portion. The toilet main body 2 and flush water for washing the toilet main body 2 are shown in FIGS. And a water storage tank 4 for storing water. The toilet body 2 is made of earthenware with a glaze layer formed on the surface, a skirt portion 6 is formed in the lower portion, and a bowl portion 8 is formed in the front of the upper half. In addition, a common water passage 10 whose upstream end communicates with the water storage tank 4 is formed in the upper rear portion of the bowl portion 8, and a drain pipe 12 for discharging filth is formed in the lower rear portion of the bowl portion 8. Has been.

  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 the present embodiment, the present invention may be applied to a direct pressure flush toilet that does not have the water storage tank 4 and is supplied with wash water directly from the water supply, or a flush toilet that is supplied with flush water by a flush valve. it can.

  The bowl portion 8 includes a bowl-shaped filth receiving surface 16 (details will be described later), a rim portion 18 positioned on 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 18 a of the rim portion 18 has an overhanging shape toward the inside, so that swirling cleaning water described later does not jump out. Yes.

  A first water discharge port 22 (details will be described later) for discharging cleaning water is formed slightly behind the central portion on the left side when viewed from the front of the inner peripheral surface of the rim portion 18 of the bowl portion 8, and is viewed from the front. A second water discharge port 24 (details will be described later) is formed on the right rear side (downstream side). The first water outlet 22 and the second water outlet 24 are swung in the same direction (counterclockwise direction in FIG. 1) to form a swirling flow described later.

Moreover, the common water flow path 10 formed in the rear upper part of the flush toilet 1 mentioned above is branched into the 1st water flow path 26 and the 2nd water flow path 28 toward the toilet front. The first water passage 26 is for supplying cleaning water to the first water outlet 22, and the second water passage 28 is for supplying cleaning water to the second water outlet 24.
In the flush toilet 1 of the present embodiment, the first water passage 26 including the first water outlet 22 and the second water passage 28 including the second water outlet 24 are integrated with the ceramic toilet body 2. Although the form currently formed is demonstrated, it is not restricted to such a form, About the 1st waterway containing a 1st water outlet and the 2nd waterway containing a 2nd water outlet, it is a separate body from a toilet bowl main 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 1 according to the present embodiment extends along the radial line toward the inlet of the drainage pipe 12. Are formed in a convex shape upward.

  Further, as shown in FIGS. 2 and 3, a water guide path 30 that guides cleaning water is formed in a region below the inner peripheral surface 18 a of the rim portion 18 of the bowl portion 8. This water conduit 30 is for the cleaning water discharged from the first water discharge port 22 to turn along the inner peripheral surface 18 a of the rim portion 18, and from the first water discharge port 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 side (see FIG. 3). Since the wash water discharged from the first water discharge port 22 swirls along the water conduit 30, it flows from the front side of the bowl portion 8 to be described later toward the inlet 32 a of the introduction pipe 32 of the drain pipe 12. A main flow rate M (details will be described later) can be formed.

Next, as shown in FIGS. 2 and 3, the drainage pipe 12 is connected to the bottom surface of the recess 20 and extends backward and downward, and the drainage trap connected to the introduction pipe 32 and extends upward. And a conduit 34. Further, the drain trap pipe 34 is composed of an ascending pipe 34a and a descending pipe 34b.
The introduction pipe line 32 is connected to the bottom surface 36 of the concave part 20 as a smooth continuous curved surface, and the washing water flowing into the introduction pipe line 32 from the concave part 20 flows smoothly in the introduction pipe line 32. .

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

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

  The front side 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 such that the entire area of this surface is located below the stored water level W and above the lower end 42 a 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 be directed toward the front region of the introduction conduit 32 and to be inclined downward toward the inside. Further, the rear bottom surface 42 of the recess 20 is formed so that the entire area of this surface is located below the stored water level W. Note that the rear bottom surface 42 of the recess 20 does not have to be a flat surface, and may be formed of a curved surface slightly curved upward.

  As shown in FIG. 1, the wall surfaces 38 a and 38 b in the left and right side regions of the recess 20 are formed flush with the introduction pipe line 32 of the drain pipe 12. As a result, the bottom surface 36 is not formed in the left and right regions of the recess 20. In addition, the inlet 32 a of the introduction pipe 32 of the drain pipe 12 has a center in the front-rear direction located behind the center in the front-rear direction of the reservoir surface S in plan view.

Next, as shown in FIGS. 9 and 10 (a) to (d), the introduction pipe line 32 is connected from the inlet 32 a connected to the bottom surface 36 of the recess 20 to the inlet of the rising pipe 34 a of the drain trap pipe 34. In the AA cross section, BB cross section, CC cross section and DD cross section of the introduction pipe line 32 up to the outlet 32b connected to the central axis C1, C2 perpendicular to each cross section , C3, and C4, the cross-sectional areas A1, A2, A3, and A4 of the outer peripheral region are from the cross-sectional areas B1, B2, B3, and B4 of the inner peripheral region with respect to each central axis C1, C2, C3, and C4. Is formed to be smaller.
That is, the filth is slow and has a lower flow rate than the rear region R of the inlet 32a of the introduction pipe line 32 into which the washing water flows directly from the front side of the bowl portion 8 and the inner peripheral side area R of the introduction pipe line 32. In addition, the front side area F of the inlet 32a of the introduction pipe line 32 where the floating filth tends to stay and the cross-sectional area of the outer side area F are set to be smaller than the central axes C1, C2, C3, C4 in the introduction pipe line 32. Has been. Thereby, the area | region where the flow velocity in the introductory pipe line 32 is slow can be reduced, and generation | occurrence | production of a stagnation can be suppressed. Further, by setting the cross-sectional area of the front side region F of the inlet 32a of the introduction pipe line 32 and the outer peripheral side area F in the introduction pipe line 32 where the flow rate is low and small filth and floating filth are likely to stay, A rear region R (inner peripheral region R of the introduction conduit 32) through which the cleaning water flows directly from the front side of the bowl portion 8 and a front region F (introduction conduit) of the introduction conduit 32 32 in each of the outer peripheral side regions F), the flow velocity distribution of the washing water becomes uniform (the velocity distribution of the washing water becomes uniform), the flow of the washing water in the drain pipe 12 becomes smooth, The filth and the floating filth can be reliably discharged without staying in the front region F of the introduction pipe line 32.

  Moreover, as shown to (a)-(d) of FIG.9 and FIG.10, the bottom face 32c of the introduction pipe line 32 is each AA cross section orthogonal to each central axis C1, C2, C3, C4, In the BB cross section, CC cross section, and DD cross section, it is formed in a substantially U shape. As a result, the floating filth in the introduction pipe line 32 is taken along the AA, BB, CC, and DD sections perpendicular to the central axes C1, C2, C3, and C4 of the introduction pipe 32. In addition, the water can be collected at substantially the center, and a smooth flow can be formed in which the flow velocity distribution of the washing water in the introduction pipe line 32 is uniform. Therefore, small filth and floating filth can be more reliably discharged without staying in the front region F of the introduction conduit 32 (the outer peripheral region F of the introduction conduit 32).

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

  Next, as shown in FIGS. 9 and 10 (a) to (g), the rising pipe 34a of the drain trap pipe 34 extends over the entire area from the inlet 34c to the outlet 34d. The cross-sectional area of 34 a 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 line 32. That is, the cross-sectional area (A5 + B5), the cross-sectional area (A6 + B6) of the FF cross section, and the cross-sectional area (A7 + B7) of the GG cross section of the rising pipe 34a are the minimum of the introduction pipe line 32. The cross-sectional area is set to be larger than the cross-sectional area of the BB cross section. Thereby, the wash water that has passed through the introduction pipe line 32 is smoothly discharged along the ascending pipe line 34a.

  Next, as shown in FIG. 9, the upper surface 34f of the ascending conduit 34a of the drain trap conduit 34 has a virtual vertex P at the boundary D1 between the ascending conduit 34a and the descending conduit 34b. A wall surface 34h is formed so as to extend 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 pipe line 34b is opposed to the ceiling surface 34j so as to connect the upper ends of these wall surfaces 34h and 34i. Is formed. These wall surfaces 34h and 34i and the ceiling surface 34j are spaces V for preventing the occurrence of siphon action for preventing the occurrence of siphon action in a region above the rear end 34g and the boundary portion D1 of the upper face 34f of the ascending pipeline 34a. Is forming. With this siphon action preventing space V, the washing water that has flowed into the ascending pipeline 34a can reliably rise up to the rear end 34g of the upper surface 34f of the ascending pipeline 34a without flowing back to the front side. When passing through the rear end 34g of the upper surface 34f of the ascending pipeline 34a, the siphoning action is prevented by the space V for preventing the siphoning action from occurring, so that it passes through the vicinity of the apex P and reliably reaches the descending duct 34b It is supposed to be discharged.

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

  First, when the user operates the operation lever of the water storage tank 4, the drain valve 14 is opened, and the wash water in the water storage tank 4 flows into the common water passage 10 and is branched from the common water passage 10. Then, the wash water is discharged from the first water outlet 22 and the second water outlet 24 through the second water passage 28, respectively.

  The washing water discharged from the first water discharge port 22 first flows forward along the water guide path 30 formed on the inner peripheral surface 18 a of the rim portion 18 of the bowl portion 8, and the front end of the bowl portion 8. After passing through, it flows backward. At this time, a part of the washing water falls down the bowl portion 8 while swirling, and the filth receiving surface 16 is washed.

  A considerable amount of the washing water discharged from the first water discharge port 22 and flowing along the water conduit 30 flows from the front side of the bowl portion 8 toward the inlet 32a of the introduction pipe 32 of the drain pipe 12 and flows in the main flow M. (See FIG. 11). The partial flow M1 of the main flow M collides with the rear bottom surface 42 of the bottom surface 36 of the recess 20 and then flows out obliquely downward and forward toward the front region in the introduction pipe line 32 (see FIG. 12). Moreover, the other part flow M2 of the main flow M flows directly into the inlet 32a of the introduction pipe line 32 (refer FIG. 12).

  Here, in the present embodiment, a water conduit 30 is formed for the cleaning water to swirl along the inner peripheral surface of the rim portion 18, and the water conduit 30 extends from the first water outlet 22 to the front end of the bowl portion 8. Therefore, the main flow M with a large flow rate 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 a convex shape upward, the wash water flowing through the filth receiving surface 16 is smoothly collected at the inlet 32a of the introduction pipe line 32. As a result, the flow of the cleaning water in the introduction pipe line 32 becomes smooth.

  Further, the wash water discharged forward from the first water discharge port 22 forms a main flow M that flows from the front side of the bowl portion 8 toward the inlet 32a of the introduction conduit 32, and a part M1 of the main flow M is formed. A collision occurs with the rear bottom surface 42 of the bottom surface 36 of the recess 20, and a part M 1 of the collided main flow flows toward a front region in the introduction pipe line 32. In particular, the rear bottom surface 42 of the bottom surface 36 is formed so as to incline downward toward the inside, so that a part of the main flow M1 that collides with the rear bottom surface 42 is transferred to the front region of the introduction pipe line 32. It can guide smoothly toward. In addition, another part of the main flow M2 of the cleaning water flows into the rear region in the introduction pipe line 32.

  Thereby, the cleaning which collided with the rear side area R (inner peripheral side area R of the introduction pipe line 32) into which the cleaning water flows directly from the front side of the bowl portion 8 and the rear side bottom face 42 of the bottom face 36. The flow velocity distribution of the washing water becomes uniform (the velocity distribution is uniform) in the front region F of the introduction pipe line 32 into which water flows (the outer peripheral side area F of the introduction pipe line 32). Since no stagnation occurs in the front area of the water, the flow of the washing water in the introduction pipe line 32 becomes smooth, so that small filth and floating filth are not retained in the front area of the introduction pipe line 32. Can be discharged reliably.

  In addition, since the introduction pipe line 32 of the drain pipe line 12 is connected to the bottom surface 36 of the recess 20 and has substantially the same diameter (substantially the same cross-sectional shape) and extends rearward and downward, the washing water can be smoothly discharged. Can be introduced into the introduction pipe line 32. As a result, small filth and floating filth can be reliably discharged.

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

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

  At this time, the washing water flowing into the inlet 32a of the introduction pipe 32 has a low flow velocity, and the front region F of the inlet 32a of the introduction pipe 32 and the outer periphery in the introduction pipe 32 tend to retain small filth and floating filth. By setting the cross-sectional area of the side region F to be small, the rear region R of the introduction conduit 32 into which the cleaning water flows directly from the front side of the bowl portion 8 (the inner peripheral region R of the introduction conduit 32). ) And the front region F of the introduction pipe line 32 (the outer peripheral side area F of the introduction pipe line 32), the flow velocity distribution of the washing water becomes uniform, and the inside of the introduction pipe line 32 flows smoothly.

  Further, when the cleaning water flows in the introduction pipe line 32 with a uniform flow velocity distribution, the bottom surface 32c of the introduction pipe line 32 is formed in a substantially U-shape, so that the inside of the introduction pipe line 32 In a state in which the floating filth is collected at substantially 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 line 32. A smooth flow M4 to the ascending pipeline 34a is formed. As a result, small filth and floating filth are discharged to the ascending pipeline 34a without staying in the front region F of the introduction conduit 32 (the outer peripheral region F of the introduction conduit 32).

  Furthermore, since the cross-sectional area of the ascending pipeline 34a is larger than the smallest cross-sectional area (A2 + B2) of the introduction conduit 32 over the entire area, the ascending pipeline 34a extends from the introduction conduit 32. The washing water containing small filth and floating filth that flowed into the pipe forms a flow M5 that smoothly rises in the ascending pipeline 34a toward the descending pipeline 34b.

  Next, the washing water that flows into the ascending pipeline 34a from the introduction conduit 32 and rises through the ascending pipeline 34a passes through the vicinity of the apex P, which is the boundary portion D1 between the ascending pipeline 34a and the descending pipeline 34b. Thus, a flow M6 to the descending pipe 34b is formed. At this time, the generation of the siphon action is suppressed by the space V for preventing the occurrence of the siphon action formed in a region above the vicinity of the apex P. Accordingly, the flow M5 of the cleaning water that has risen into the ascending pipeline 34a can reliably rise to the rear end 34g of the upper surface 34f of the ascending pipeline 34a without flowing backward to the front side, and the ascending pipeline 34a. When passing through the rear end 34g of the upper surface 34f, a flow M6 that passes through the vicinity of the apex P and is reliably discharged to the descending conduit 34b is formed. As a result, the small filth and the floating filth are surely discharged to the descending pipe 34 b 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 wash water discharged forward from the first water discharge port 22 is introduced from the front side of the bowl portion 8 to the introduction pipe line 32 of the drain pipe 12. The main flow M flowing toward the inlet 32a is formed. At this time, the introduction pipe line 32 of the drainage pipe line 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 ascending pipe line 34a. The central axes C1, C2, C3, C4 that are perpendicular to the respective sections in the AA, BB, CC, and DD sections perpendicular to the axes C1, C2, C3, C4. In contrast, the cross-sectional areas A1, A2, A3, and A4 of the outer peripheral region are smaller than the cross-sectional areas B1, B2, B3, and B4 of the inner peripheral region with respect to the central axes C1, C2, C3, and C4. Is formed. Therefore, compared with the rear side area | region R of the inlet 32a of the introductory pipe line 32 into which washing water flows in directly from the front side of the bowl part 8, and the inner peripheral side area | region R of the introductory pipe line 32, a small filth is slow. In addition, the cross-sectional area of the front side region F of the inlet 32a of the introduction pipe line 32 and the outer peripheral side area F in the introduction pipe line 32 where floating filth tends to stay can be reduced. Therefore, the area | region where the flow velocity in the introduction pipe line 32 is slow can be reduced, and generation | occurrence | production of a stagnation can be suppressed. Further, by setting the cross-sectional area of the front side region F of the inlet 32a of the introduction pipe line 32 and the outer peripheral side area F in the introduction pipe line 32 where the flow rate is low and small filth and floating filth are likely to stay, A rear region R (inner peripheral region R of the introduction conduit 32) through which the cleaning water flows directly from the front side of the bowl portion 8 and a front region F (introduction conduit) of the introduction conduit 32 In each of the outer peripheral side regions F) 32, the flow velocity distribution of the washing water becomes uniform, the velocity distribution of the washing water becomes uniform, and the flow of the washing water in the drain pipe 12 becomes smooth. Thus, the filth and floating filth can be reliably discharged without being retained in the front region of the introduction pipe line 32.

  Further, according to the flush toilet 1 according to the present embodiment, since the bottom surface 32c of the introduction pipe line 32 is formed in a substantially U shape, the floating filth in the introduction pipe line 32 is removed from each of the introduction pipe lines 32. The water can be collected at substantially the center of the AA, BB, CC, and DD sections perpendicular to the central axes C1, C2, C3, and C4. 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 region F of the introduction pipe line 32 (the outer peripheral side area F of the introduction pipe line 32).

  Furthermore, according to the flush toilet 1 according to the present embodiment, the cross-sectional area of the rising pipe 34a of the drain pipe 12 is the smallest cross-sectional area (A2 + B2) of the introduction pipe 32 over the entire area of the rising pipe 34a. Therefore, the washing water that has passed through the introduction pipe line 32 is smoothly discharged along the ascending pipe line 34a. Therefore, small filth and floating filth can be reliably discharged without being retained in the drain pipe 12.

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

  In the flush toilet 1 according to the present embodiment described above, the wash-out flush toilet has been described as an example. However, the sewage inside the bowl portion is sucked into the bowl portion using a siphon action, and the drain trap pipe is connected to the outside at once. A so-called siphon flush toilet may be used.

  Moreover, in the flush toilet 1 by this embodiment mentioned above, although wash water is discharged from the 1st water discharge port 22 and the 2nd water discharge port 24, it is not restricted to this, Only a 1st water discharge port. The second water outlet may be omitted. In this case, since the amount of washing water discharged from the first water outlet can be increased, a part of the washing water discharged from the first water outlet turns to the rear of the bowl portion and enters the recess from the rear. It can penetrate | invade and becomes substantially the same as the case where water is discharged from the second water outlet.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 4 Reservoir tank 6 Toilet body skirt part 8 Toilet body bowl part 10 Common water passage 12 Drain pipe 14 Drain valve 16 Soil receiving surface 16a Rear side waste receiving surface 16b Front side waste receiving surface 18 Rim part 18a Inner peripheral surface 20 Concave part 22 First water discharge port (rim water discharge part)
24 2nd water outlet (rim water discharge part)
26 1st waterway 28 2nd waterway 30 Water guideway 32 Introduction pipe line 32a Inlet of introduction pipe line (inlet of introduction pipe line)
32b Outlet of introduction pipeline (outflow of introduction pipeline)
32c Bottom of the introduction line 34 Drain trap line 34a Ascending line 34b Down line 34c Ascending line 34d Ascending line outlet 34e Ascending line bottom 34f Ascending line top 34g Ascending line top Rear end 34h Wall surface 34i Wall surface 34j Ceiling surface 36 Bottom surface 38 Wall surface 38a Left wall surface 38b Right wall surface 40 Front bottom surface 42 Rear bottom surface 42a Lower end A1 Cross-sectional area of the outer peripheral region with respect to the central axis in the AA section of the introduction pipe line A2 Cross-sectional area of outer peripheral side with respect to central axis in BB cross section of introduction pipe line A3 Cross-sectional area of outer peripheral side with respect to central axis in CC cross section of introduction pipe line A4 DD cross section of introduction pipe line Cross-sectional area of the outer peripheral side area with respect to the central axis in A5 A5 Cross-sectional area of the outer peripheral side area with respect to the central axis in the EE cross section of the rising pipe Cross sectional area of outer peripheral side with respect to central axis in cross section A7 Cross sectional area of outer peripheral side with respect to central axis in GG cross section of ascending pipeline B1 Inner with respect to central axis in AA cross section of introduction pipe B2 Cross-sectional area of the peripheral region B2 Cross-sectional area of the inner peripheral side with respect to the central axis in the BB cross section of the introduction pipe B3 Cross-sectional area of the inner peripheral side of the central axis in the CC cross section of the introduction pipe B4 Cross-sectional area of the inner peripheral side area relative to the central axis in the DD cross section of the introduction pipe line B5 Cross-sectional area of the inner peripheral area relative to the central axis line in the EE cross section of the ascending pipe line B6 F of the ascending pipe line Cross section area of inner peripheral side with respect to central axis in cross section -F B7 Cross sectional area of inner peripheral side with respect to central axis in GG section of ascending pipeline C1 Central axis of AA cross section of introduction pipe C2 Center axis of BB cross section of introduction pipe C3 Introduction pipe Central axis of C-C cross section of the road C4 Central axis of DD cross section of the introduction pipe C5 Central axis of E-E cross section of the rising pipe of the drain trap pipe C6 F- of the rising pipe of the drain trap pipe F Central axis of cross section C7 Central axis of GG cross section of ascending pipe of drain trap pipe D1 Boundary area between ascending pipe and descending pipe F Front area of introduction pipe, outer peripheral area of introduction pipe M Main part of the wash water discharged from the first outlet M1 Part of the main part of the wash water discharged from the first outlet M2 Other part of the main part of the wash water discharged from the first outlet M3 Second discharge Main flow of washing water spouted from the water mouth M4 Flows in the introduction pipe M5 Flows in the rise pipe M6 Flow from the rise pipe to the down pipe P Virtual apex R Rear area of the introduction pipe, introduction pipe Area on the inner circumference of the road S Reservoir surface V Space for preventing siphon action W Reservoir water level

Claims (4)

A flush toilet that flushes the toilet body with wash water supplied from a water supply source and discharges filth,
A bowl portion comprising a filth receiving surface, a rim portion located at the upper edge, and a recess formed below the filth receiving surface;
A rim water spouting part that spouts the washing water toward the front of the bowl part and forms a swirling flow that swirls along the inner peripheral surface of the rim part;
A drain pipe for connecting the inlet to the concave portion of the bowl portion and discharging filth,
The concave portion of the bowl portion includes a bottom surface located below the stored water level, and a wall surface connecting the bottom surface and the lower edge of the waste receiving surface,
The drainage pipe is connected to the bottom surface of the concave portion and extends rearward and downward, a riser pipe connected to the introduction pipe and extending upward, and a lower part connected to the riser pipe A descending conduit extending to
The bowl part is configured to form a main flow in which the wash water discharged from the water discharge part flows from the front side of the bowl part toward the inlet of the drain pipe,
The introduction pipe line extends from the inlet connected to the bottom surface of the recess to the outlet connected to the rising pipe, in a cross section perpendicular to the central axis of the introduction pipe, A flush toilet characterized in that a cross-sectional area of an outer peripheral side region of an introduction pipe line is formed to be smaller than a cross-sectional area of an inner peripheral side region.   The flush toilet according to claim 1, wherein the introduction pipe line has a substantially U-shaped bottom surface in a cross section perpendicular to the central axis.   The flush toilet according to claim 1 or 2, wherein the rising pipe of the drain 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 pipeline of the drainage pipe has a vertex at the boundary between the ascending pipeline and the descending pipeline, and a region above the apex has a predetermined value for preventing the occurrence of siphon action. The flush toilet according to claim 3, wherein a space is formed.

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