JP6331008B2 - Flush toilet - Google Patents

Description

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

  In order to improve cleanability, the rim part of the toilet bowl is formed in an overhang shape that protrudes upward toward the inner space of the bowl. A flush toilet is known in which the flow of swirling is made to flow down to the bowl surface and washed (Patent Document 1). In this flush toilet, in order to improve the discharge performance of filth, the width of the shelf is gradually narrowed toward the tip of the bowl portion in order to form a main flow from the front toward the trap. Moreover, in addition to the rim water spouting port provided in the rim part, a jet water spouting port is provided, and the washing water in the water storage part in the recess is stirred in the vertical direction.

JP 2008-45276 A

  However, in the flush toilet described in Patent Document 1, in order to improve the washability of the bowl surface of the bowl portion, for example, the jet water spouting is eliminated, and the swirling of the washing water discharged from the rim spout is performed. When trying to wash the bowl surface only by the flow, the amount of wash water discharged from the rim spout increases, thereby increasing the momentum of the swirling wash water and forming the main flow toward the inlet of the drain trap line Can not be. Specifically, the momentum of the washing water swirling around the rim inner peripheral surface of the rim portion becomes stronger, the position of the bowl portion flowing down to the bowl surface is not determined, and the main flow in a bundle toward the inlet of the drain trap pipe is It cannot be formed. Therefore, when the bowl surface of the bowl portion is cleaned with the cleaning water discharged from the rim water spouting port, there arises a problem that the waste discharging performance is deteriorated.

  The present invention has been made in order to solve the above-described problems of the prior art, and even when the bowl portion is cleaned only with the cleaning water discharged from the rim water spouting port, it is provided at the inlet of the drain trap portion. An object of the present invention is to provide a flush toilet that can reliably form a mainstream that is bundled in a bundle and improve the discharge performance of filth.

In order to achieve the above object, the present invention is a flush toilet which cleans the toilet bowl body with washing water supplied from a water supply source and discharges filth, and has a bowl-shaped filth receiving surface and an upper edge. A rim portion having an inner peripheral surface, a drain trap portion formed on the lower side of the bowl portion for discharging filth, and washing water from the rim spout to the inner peripheral surface of the rim portion. A rim spouting part that spouts in a substantially horizontal direction and forms a swirling flow, and the rim part has an inner surface exposed to the inner space of the bowl part and extends upward toward the inner space. The inner peripheral surface is formed of a bottom surface, a side surface extending upward from the outer end of the bottom surface, and a top surface extending from the upper end of the side surface toward the inner space. Wash water swirling and swirling from the water discharge section. Guide portion for dropping a predetermined position of the bowl portion led to the surface is formed, the guide portion is gradually radius of curvature of a portion extending to the side surface from the bottom surface of the inner peripheral surface of the rim portion along the turning direction of the wash water It is a guide region formed on the inner peripheral surface of the rim portion so as to be larger .
In the flush toilet of the present invention configured as described above, by the guide portion formed in the bowl portion, the swirling wash water discharged from the rim water discharge portion is guided to the upper surface of the overhang-shaped rim portion, and the rim portion The washing water that has collided with the upper surface of the bowl can be dropped to a predetermined position of the bowl portion. As a result, according to the present invention, it is possible to form a bundled flow (main flow) that flows from a predetermined position of the bowl portion to the inlet of the drain trap portion, thereby improving the waste discharging performance. Further, according to the present invention, the guide portion is formed on the inner peripheral surface of the rim portion so that the radius of curvature of the portion extending from the bottom surface of the inner peripheral surface of the rim portion to the side surface gradually increases along the swirling direction of the cleaning water. Since the guide region is formed, the cleaning water is guided to the upper surface of the overhanging rim portion without significantly impairing the swirling performance of the swirling cleaning water, and the cleaning water colliding with the upper surface of the rim portion is It can be dropped to a predetermined position.

In the present invention, preferably, in a region downstream of the guide region on the inner peripheral surface of the rim portion, the radius of curvature of the inner peripheral surface of the rim portion extending from the bottom surface to the side surface is along the swirling direction of the washing water. It is formed to be smaller.
In the present invention configured as above, in the region downstream of the guide region on the inner peripheral surface of the rim portion, the radius of curvature of the region in which the inner peripheral surface of the rim portion extends from the bottom surface to the side surface is the swirling direction of the washing water Therefore, the cleaning water that has collided with the upper surface of the rim portion is guided to the upper surface of the overhanging rim portion without significantly impairing the swirling performance of the rotating cleaning water. Can be dropped to a predetermined position of the bowl portion.

In the present invention, preferably, in a region downstream of the guide region of the inner peripheral surface of the rim portion, the side surface of the inner peripheral surface of the rim portion is inclined to the inner space side toward the vertical surface extending substantially vertically or upward. It is formed by an inclined surface.
In the present invention configured as above, in the region downstream of the guide region on the inner peripheral surface of the rim portion, the side surface of the inner peripheral surface of the rim portion extends substantially vertically, or the inner space side toward the upper side. Since it is formed by the inclined surface inclined toward the top, the cleaning water that has collided with the upper surface of the rim portion by the guide portion can be surely dropped to a predetermined position of the bowl portion.

In the present invention, preferably, the upper surface of the inner peripheral surface of the rim portion is formed substantially horizontally in the guide region where the guide portion is formed.
In the present invention configured as described above, since the upper surface of the inner peripheral surface of the rim portion is formed substantially horizontally in the guide region where the guide portion is formed, the cleaning guided to the upper surface by the guide portion. Water can be reliably dropped to a predetermined position of the bowl portion.

In the present invention, preferably, the guide portion is located downstream of the region of the minimum curvature radius from the position where the curvature radius is smaller than the maximum curvature radius on the upstream side of the region of the minimum curvature radius in a plan view of the bowl portion. The small curvature radius is formed in a predetermined region up to a position where the maximum curvature radius is reached.
In the present invention configured as described above, since the guide portion is provided in the above-described predetermined region, the bundled flow that flows from the front side of the bowl portion, which is the region of the minimum radius of curvature, to the inlet of the trap portion. It can be formed easily.

In the present invention, preferably, the rim water spouting portion is formed on either one of the left and right sides of the predetermined region, the guide portion is formed on the other side, and the rim water is washed water discharged from the rim water spouting portion. After passing through the front end of the rim portion, it is configured to turn to the guide portion.
In the present invention configured as described above, since the distance between the rim water spouting portion and the guide portion is short, the flow of the bundle that has been sprinkled is guided to the upper surface of the rim portion and collides and falls to a predetermined position on the bowl portion. Can be made.

In the present invention, preferably, the guide portion is an inclined surface that is formed on a filth receiving surface in the rear side region of the bowl portion and is inclined so that the cleaning water discharged from the rim water discharge portion faces the upper surface of the rim portion.
In the present invention configured as above, the guide portion is formed on the filth receiving surface in the rear side region of the bowl portion, and the inclined surface is inclined so that the wash water discharged from the rim water discharge portion faces the upper surface of the rim portion. Therefore, the swirling cleaning water is guided to the upper surface of the overhanging rim portion without significantly impairing the swirling performance of the swirling cleaning water, and the cleaning water colliding with the upper surface of the rim portion is moved to a predetermined position of the bowl portion. Can be dropped.

  According to the flush toilet of the present invention, even when the bowl portion is washed only with the wash water discharged from the rim spout, the mainstream in a bundle toward the inlet of the drain trap portion is reliably formed. , The waste discharge performance can be improved.

It is the schematic which shows the state installed in the wall surface of the flush toilet bowl by 1st Embodiment of this invention. It is a top view which shows the flush toilet bowl by 1st Embodiment of this invention. It is side surface sectional drawing of the flush toilet seen along the III-III line of FIG. It is front sectional drawing of the flush toilet seen along the IV-IV line of FIG. It is front sectional drawing of the flush toilet seen along the VV line of FIG. It is front sectional drawing of the flush toilet seen along the VI-VI line of FIG. It is sectional drawing of the flush toilet seen along the VII-VII line of FIG. It is sectional drawing of the flush toilet seen along the VIII-VIII line of FIG. It is sectional drawing of the flush toilet seen along the IX-IX line of FIG. It is a figure which shows the rim | limb part seen toward the front from the inner side space of the bowl part of the flush toilet bowl by 1st Embodiment of this invention. It is the perspective view seen from the side which shows the mode of the flow of the washing water in the flush toilet according to the first embodiment of the present invention. It is the perspective view seen from the upper direction which shows the mode of the flow of the washing water in the flush toilet according to the first embodiment of the present invention. It is a top view which shows the flush toilet bowl by 2nd Embodiment of this invention. It is sectional drawing of the flush toilet seen along the XIV-XIV line | wire of FIG. It is the fragmentary sectional view of the flush toilet seen along the XV-XV line of FIG. It is the fragmentary sectional view of the flush toilet seen along the XVI-XVI line of FIG.

  Next, a flush toilet according to a first embodiment of the present invention will be described with reference to the accompanying drawings. First, the installation state of the flush toilet according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic view illustrating a state where the flush toilet is installed on the wall surface according to the first embodiment of the present invention. As shown in FIG. 1, the code | symbol 1 shows the flush toilet 1 by this embodiment, and this flush toilet 1 uses the drop by the water level rise in the drain trap line mentioned later to wash away waste. This is a flush toilet (wash-down toilet). In the present embodiment, the flush toilet may be another type of toilet such as a siphon flush toilet.

  The flush toilet 1 includes a toilet body 2, which is attached to a wall 4. A water storage tank 6 for storing cleaning water is attached to the back side of the wall 4, and an operation switch 8 is attached to the surface of the wall 4. When the operation switch 8 is turned on, the washing water in the water storage tank 6 is supplied to the toilet body 2 and the toilet body 2 is washed. Further, a drain pipe 10 for discharging filth is provided on the back side of the wall 4, and the filth from the toilet body 2 is discharged to the outside by the drain pipe 10.

  Next, the flush toilet 1 according to the present embodiment will be described in detail with reference to FIGS. 2 is a plan view showing the flush toilet according to the first embodiment of the present invention, FIG. 3 is a side sectional view of the flush toilet as seen along the line III-III in FIG. 2, and FIG. 2 is a front sectional view of the flush toilet as seen along line IV-IV in FIG. 2, FIG. 5 is a front sectional view of the flush toilet as seen along line V-V in FIG. 2, and FIG. 2 is a front sectional view of the flush toilet as seen along line VI-VI in FIG. 2, FIG. 7 is a sectional view of the flush toilet as seen along line VII-VII in FIG. 2, and FIG. FIG. 9 is a sectional view of the flush toilet as viewed along line VIII-VIII of FIG. 9, FIG. 9 is a sectional view of the flush toilet as viewed along line IX-IX in FIG. 2, and FIG. It is a figure which shows the rim | limb part seen toward the front from the inner side space of the bowl part of the flush toilet bowl by one Embodiment.

  As shown in FIGS. 2 and 3, the toilet body 2 of the flush toilet 1 according to the first embodiment of the present invention includes a bowl portion 12 and a drain trap pipe 14 extending from the bottom portion of the bowl portion 12 so as to communicate therewith. Have. The bowl portion 12 includes a filth receiving surface 16 and a rim portion 18 formed on the upper edge of the filth receiving surface 16. Furthermore, the filth receiving surface 16 of the bowl portion 12 includes a bowl-shaped upper filth receiving surface 20 and a recess 22 formed between the upper filth receiving surface 20 and the drain trap pipe 14.

  The drain trap pipe 14 extends obliquely upward from the inlet 14a opened at the bottom of the bowl portion 12, passes through the highest point 14b, extends obliquely downward, reaches the outlet 14c, and the drain pipe 10 described above (FIG. 1). Connected). The stored water level L of the flush toilet 1 is equal to the height of the highest point 14 b of the drain trap pipe 14.

  Further, a water passage chamber 24 is formed at the rear portion of the toilet body 2, and wash water is supplied to the water passage chamber 24 from the water storage tank 6 described above. The front side of the water flow chamber 24 extends to the rim portion 18 and is connected to a rim water passage 26 formed inside the rim portion 18. When the toilet body 1 is viewed from the front, one rim spout 28 is formed on the inner peripheral side of the front region on the left side of the rim portion 18, and the above-described rim water passage 26 extends to the rim spout 28, and the washing water Is supplied up to the rim spout 28. Wash water is spouted forward from the rim spout 28 to form a swirling flow in the bowl portion 12.

  Next, the water conduit of the flush toilet 1 will be described with reference to FIGS. As shown in FIGS. 2 to 6, on the downstream side of the rim spout 28 on the inner circumferential surface of the rim portion 18, a shelf-shaped and overhang-shaped first water conduit 30 for flowing cleaning water is formed. ing. Specifically, the first water conduit 30 formed on the inner peripheral surface of the rim portion 18 includes a bottom surface 30a, a side surface 30b extending upward from the outer end of the bottom surface 30a, and an inner side from the upper end of the side surface 30b. And an upper surface 30c extending toward the space. The first water conduit 30 is formed at the same level as the rim water spouting port 28, from the position of the rim water spouting port 28 (the left front region of the bowl portion 12 when viewed from the front) to the front region on the right side of the bowl portion 12. It extends.

  Further, a shelf-shaped second water conduit 32 is formed between the rim portion 18 and the upper waste receiving surface 20. The second water conduit 32 is located inside the first water conduit 30 and is provided at a position lower than the first water conduit 30 through a step. As shown in FIG. 2, the second water conduit 32 extends from the center on the left side to the center on the right side through the front end when viewed from the front of the bowl portion 12. Moreover, the 2nd water conduit 32 is formed in the same height position (level) along the length direction. Further, the above-described shelf-shaped second water conduit 32 is not formed in the rear region of the upper filth receiving surface 20 but has a curved shape.

  Next, the concave portion 22 of the filth receiving surface 16 of the bowl portion 12 will be described with reference to FIGS. 2, 3, 5, and 6. The concave portion 22 has a substantially triangular shape in a plan view, and has a tapered shape that tapers forward. The recess 22 is formed by a wall surface 34 and a bottom surface 36, and the bottom surface 36 further includes a front bottom surface 36 a positioned in the front and a rear bottom surface 36 b positioned in the rear. The front bottom surface 36a is formed so as to be shallower than the rear bottom surface 36b (see FIG. 3). The rear bottom surface 36 b is connected to the inlet 14 a of the drain trap pipe 14 described above.

The taper-shaped angle θ of the recess 22 is preferably 35 ° to 70 °, more preferably 35 ° to 60 °, and most preferably, in order to effectively form the longitudinal swirl flow V described later. It is 40-50.
Furthermore, as shown in FIG. 2, the triangular rear side of the recess 22 has an arc shape in plan view so that a lateral swirling flow H described later can be effectively formed.

  Next, the guide part 40 formed in the 1st water conduit 30 which is an internal peripheral surface of the rim | limb part 18 is demonstrated in detail by FIG. 2, FIG. The guide part 40 is for guiding the wash water discharged from the rim spout 28 to the upper surface 30c of the first water conduit 30 on the inner peripheral surface of the rim part 18 and dropping it toward the concave part 22 of the bowl part 12. It is.

  First, as shown in FIG. 2, the guide portion 40 is formed on the inner peripheral surface of the front region on the right side of the rim portion 18 when the toilet body 2 is viewed from the front. Specifically, as shown in FIGS. 7 to 10, the guide portion 40 has a radius of curvature (R1, R2) at a portion extending from the bottom surface 30a of the first water conduit 30 which is the inner peripheral surface of the rim portion 18 to the side surface 30b. ) Is formed as a guide region 40a (X1) on the inner peripheral surface of the rim portion 18 so as to gradually increase along the swirling direction of the washing water. Specifically, in the guide region 40a, as shown in FIGS. 7, 8, and 10, the radius of curvature of the portion extending from the bottom surface 30a of the first water conduit 30 that is the inner peripheral surface of the rim portion 18 to the side surface 30b. R changes from almost zero to the curvature radius R1 (= 20 mm) and further gradually increases to the maximum curvature radius R2 (= 40 mm). Here, the maximum curvature radius of the guide region 40a is preferably 30 mm to 50 mm.

  Next, as shown in FIGS. 9 and 10, in the region (X2) downstream of the guide region 40a on the inner peripheral surface of the rim portion 18, the inner peripheral surface of the rim portion 18 changes from the bottom surface 30a to the side surface 30b. The radius of curvature of the extending portion is formed so as to gradually decrease along the swirling direction of the washing water. Specifically, in the region (X2) downstream from the guide region 40a, the radius of curvature of the portion extending from the bottom surface 30a to the side surface 30b becomes a curvature radius R3 (= 3 mm) that is substantially zero from the maximum curvature radius R2. .

  In the region (X2) downstream of the guide region 40a on the inner peripheral surface of the rim portion 18, as shown in FIG. 9, the side surface 30b of the inner peripheral surface of the rim portion 18 extends substantially vertically or upward. It is formed by the inclined surface which inclines toward the internal space side.

  Further, as shown in FIGS. 7 and 8, the upper surface 30c of the inner peripheral surface of the rim portion 18 is formed substantially horizontally in the guide region 40a (X1) where the guide portion 40 is formed.

  Further, as shown in FIG. 2, the guide portion 40 is not limited to the inner peripheral surface of the front region on the right side of the rim portion 18 when the toilet body 2 described above is viewed from the front, but has a minimum curvature in a plan view of the bowl portion 12. A small radius of curvature is maximized on the downstream side of the region with the smallest radius of curvature (tip of the bowl portion 12) from the position where the radius of curvature is smaller than the largest radius of curvature on the upstream side of the radius region (tip of the bowl portion 12). You may form in the internal peripheral surface of the rim | limb part 18 of the area | region (X3) to a position used as a curvature radius.

  Next, the operation of the flush toilet according to the first embodiment of the present invention described above will be described mainly with reference to FIGS. FIG. 11 is a perspective view seen from the side showing the flow of washing water in the flush toilet according to the first embodiment of the present invention, and FIG. 12 is the flush water in the flush toilet according to the first embodiment of the present invention. It is the perspective view seen from the upper part which shows the mode of the flow of this.

  When the user turns on the operation switch 8, the wash water in the water storage tank 6 enters the water passage chamber 24 of the toilet body 2, and from this water passage chamber 24 through the rim water passage 26 and from the rim water outlet 28. The water is discharged into the bowl portion 12.

  Most of the washing water discharged from the rim water spouting port 28 first flows on the first water conduit 30. Next, a part of the washing water gradually turns upward by the guide portion 40, and the first After being guided to the upper surface 30c of the water conduit 30 and colliding with the upper surface 30c, it falls to the front region on the right side of the filth receiving surface 16 of the bowl portion 12 to become a bundled flow (main flow F1), and the tip of the bowl portion 12 It flows from the front, which is a position on the downstream side in the turning direction, to the inlet 14 a of the drain trap pipe 14.

  Next, the remaining wash water discharged from the rim water discharge port 28 flows on the first water conduit 30 and then flows on the second water conduit 32 to form the main flow F2 swirling in the bowl portion 12. To do. This main flow F2 then merges with the above-described main flow F1 and flows to the inlet 14a of the drain trap pipe 14.

  Further, a part of the washing water discharged from the rim water discharge port 28 flows on the second shelf portion 32, but the second water conduit 32 is not formed in the rear end region of the upper filth receiving surface 20, and the curved surface Since it has a shape, a part of the swirling washing water becomes a main flow F <b> 3 flowing into the recess 22 from obliquely rearward.

Next, the main flows F1 and F2 flowing into the concave portion 22 from obliquely forward flow down along the side wall of the concave portion 22, change direction upward by flowing along the front bottom surface 36a, and rise along the side wall. A longitudinal swirl flow V is formed. Further, the mainstreams F1 and F2 generate a pushing flow into the drain trap pipe 14.
On the other hand, the main flow F <b> 3 that flows into the recess 22 from obliquely rearward flows in a substantially horizontal direction along the side wall of the recess 22, thereby forming a transverse swirl flow H.

Thus, in the flush toilet 1 according to this embodiment, even if the jet water outlet is not provided as in the conventional flush toilet, that is, even if the wash water is discharged from only one rim water outlet 28, The cleaning water containing filth can be effectively stirred by the longitudinal swirl flow V and the lateral swirl flow H formed in the recess 22, and the discharge efficiency of the filth can be increased.
In addition, the flush toilet according to the present embodiment is not limited to the one provided with one rim spout, and may be provided with two rim spouts.

  Hereinafter, the operation of the flush toilet 1 according to the present embodiment will be specifically described. First, the rim is formed such that the radius of curvature of the guide portion extending from the bottom surface 30a to the side surface 30b of the first water conduit 30 formed on the inner peripheral surface of the rim portion 18 gradually increases along the swirling direction of the washing water. Since the guide region 30a (X1) is formed on the inner peripheral surface of the portion 18, the swirling cleaning water is applied to the upper surface 30c of the overhanging rim portion 18 without significantly impairing the swirling performance of the swirling cleaning water. The cleaning water that has been guided and collided with the upper surface 30c of the rim portion 18 falls to the front region on the right side of the filth receiving surface 16 of the bowl portion 12 and becomes a bundled flow (main flow F1). To the inlet 14a.

  In the region (X2) downstream from the guide region 30a on the inner peripheral surface of the rim portion 18, the radius of curvature of the portion where the first water conduit 30 on the inner peripheral surface of the rim portion 18 extends from the bottom surface 30a to the side surface 30b is cleaned. Since it is formed so as to become smaller along the direction of swirling of water, the swirling washing water is guided to the upper surface 30c of the overhanging rim portion 18 without significantly impairing the swirling performance of the swirling washing water, and the rim The wash water that has collided with the upper surface of the portion 18 falls to the front region on the right side of the filth receiving surface 16 of the bowl portion 12 to become a bundled flow (main flow F1), and from obliquely forward to the inlet 14a of the drain trap pipe 14 And flow.

  In the region (X2) downstream of the guide region 30a on the inner peripheral surface of the rim portion 18, the first water conduit 30 on the inner peripheral surface of the rim portion 18 faces the vertical surface or the upper side where the side surface 30b extends substantially vertically. Therefore, the cleaning water colliding with the upper surface 30c of the rim portion 18 by the guide portion 30 falls to the front region on the right side of the filth receiving surface 16 of the bowl portion 12. It becomes a bundled flow (main flow F1), and flows from an oblique front to the inlet 14a of the drain trap pipe 14.

  Since the upper surface 30c of the first water conduit 30 on the inner peripheral surface of the rim portion is formed substantially horizontally in the guide region 30a (X1) where the guide portion 30 is formed, the upper surface 30c is formed by the guide portion 30. The wash water introduced to the water drops to the front area on the right side of the filth receiving surface 16 of the bowl portion 12 to become a bundled flow (main flow F1), and flows obliquely forward to the inlet 14a of the drain trap pipe 14.

  A region of the minimum curvature radius (bowl portion) from a position where the guide portion has a smaller curvature radius from the maximum curvature radius upstream of the region of the minimum curvature radius (tip of the bowl portion 12) in plan view of the bowl portion 12. In the case where the small curvature radius is formed in the predetermined region (X3) up to the position where the maximum curvature radius is located downstream of the tip of 12), a drain trap from the front side of the bowl portion, which is the minimum curvature radius region A bundled flow that flows to the inlet 14a of the conduit 14 can be easily formed.

  As described above, the rim spout 28 is formed on the left side of the bowl portion 12, the guide portion 30 is formed on the left side of the bowl portion 12, and the wash water discharged from the rim spout 28 passes through the tip of the bowl portion 12. After that, the distance between the rim water spouting port 28 and the guide part 40 is shortened, so that the bundled water flow is strong and the kinetic energy is large. It can be led to the upper surface 30c of the rim part 18 and caused to collide and be dropped from the right front area of the bowl part toward the inlet 14a of the drain trap pipe 14 with a strong force. As a result, a bundled flow (main flow F <b> 1) can be formed more effectively, and can flow from the diagonally front to the inlet of the drain trap pipe 14.

  Next, a flush toilet according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a plan view showing a flush toilet according to the second embodiment of the present invention, FIG. 14 is a sectional view of the flush toilet as viewed along the line XIV-XIV in FIG. 13, and FIG. FIG. 16 is a partial cross-sectional view of the flush toilet as seen along line XV-XV, and FIG. 16 is a partial cross-sectional view of the flush toilet as seen along line XVI-XVI in FIG.

  In the present embodiment, the guide portion 50 corresponding to the above-described guide portion 40 is formed on the surface of the filth receiving surface 16 (upper filth receiving surface 20) in the rear side region on the right side of the bowl portion 12. The guide portion 50 is inclined upward so that the cleaning water discharged from the rim water discharge port 28 is directed toward the upper surface 30c of the first water conduit 30 on the inner peripheral surface of the rim portion 18 (jumps upward). The inclined surface 50a. Further, a continuous surface 52 is continuously formed on the downstream side of the inclined surface 50 a, and the boundary with the filth receiving surface 16 is made smooth by the continuous surface 52.

  In the flush toilet 1 according to the second embodiment, the guide portion 50 is formed on the filth receiving surface 16 in the rear region of the bowl portion 12, and the wash water discharged from the rim spout 28 is the first of the rim portion 18. Since the inclined surface 50a is inclined so as to face the upper surface 30c of the water conduit 30, the swirling cleaning water is guided to the upper surface 30c of the overhanging rim portion 18 without significantly impairing the swirling performance of the swirling cleaning water. The washing water colliding with the upper surface 30c of the rim portion 18 falls to the rear region of the filth receiving surface 16 of the bowl portion 12 to become a bundled flow (main flow F4), and from the back portion to the inlet 14a of the drain trap pipe 14 And flow.

    Even in the flush toilet 1 according to the second embodiment, even if the jet water outlet is not provided as in the conventional flush toilet, that is, the flush water is discharged only from the rim water outlet 28, the above-described first Similarly to the flush toilet according to the embodiment, the cleaning water containing the filth can be effectively stirred by the longitudinal swirl flow V and the lateral swirl flow H formed in the recess 22, and the discharge efficiency of the filth can be enhanced.

  In the present invention, the guide portion 40 provided in the flush toilet according to the first embodiment described above and the guide portion 50 provided in the flush toilet according to the second embodiment may be used in combination.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 6 Reservoir tank 12 Bowl part 14 Drain trap pipe 16 Soil receiving surface 18 Rim part 20 Upper sewage receiving surface 22 Recess 26 Rim water passage 28 Rim water outlet 30 First conduit 30a Bottom 30b Side 30c Upper surface 32 Second water conduit 34 Wall surface 36 Bottom surface 40, 50 Guide portions F1, F2, F3, F4 Main flow R1, R2 Curvature radius of guide portion X1 Guide region X2 Downstream region of guide region X3 Guide region H Lateral swirl flow V Vertical swirl Stream L Water level

Claims (6)

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 bowl-shaped filth receiving surface, and a rim portion located on the upper edge and having an inner peripheral surface;
A drain trap part formed on the lower side of the bowl part for discharging filth,
A rim water spouting part that spouts washing water from the rim water spouting port in a substantially horizontal direction along the inner peripheral surface of the rim part to form a swirling flow;
The rim portion is formed in an overhang shape whose inner peripheral surface is exposed in the inner space of the bowl portion and extends upward toward the inner space. The inner peripheral surface is formed from a bottom surface and an outer end of the bottom surface. It consists of a side surface extending upward and an upper surface extending toward the inner space from the upper end of this side surface,
The bowl portion is formed with a guide portion that guides the cleaning water spouted and swirled from the rim water spouting portion to the upper surface of the rim portion, and drops to a predetermined position of the bowl portion. A flush toilet characterized by a guide region formed on the inner peripheral surface of the rim so that the radius of curvature of the portion extending from the bottom surface to the side surface of the inner peripheral surface gradually increases along the swirling direction of the cleaning water . In a region downstream of the guide region on the inner peripheral surface of the rim portion, the radius of curvature of the inner peripheral surface of the rim portion extending from the bottom surface to the side surface is reduced along the swirling direction of the washing water. flush toilet according to claim 1, wherein are formed. In the region downstream of the guide region on the inner peripheral surface of the rim portion, the side surface of the inner peripheral surface of the rim portion is formed by a vertical surface extending substantially vertically or an inclined surface inclined upward toward the inner space side. The flush toilet according to claim 1 or 2 . The flush toilet according to any one of claims 1 to 3 , wherein an upper surface of an inner peripheral surface of the rim portion is formed substantially horizontally in the guide region where the guide portion is formed. The guide portion has a small radius of curvature on the downstream side of the region of the minimum curvature radius from the position where the radius of curvature is smaller than the maximum radius of curvature on the upstream side of the region of the minimum curvature radius in plan view of the bowl portion. The flush toilet according to any one of claims 1 to 4 , wherein the flush toilet is formed in a predetermined region up to a position where the radius of curvature becomes. The rim water spouting portion is formed on either side of the predetermined region in the left-right direction, the guide portion is formed on the other side, and the rim portion is washed water discharged from the rim water spouting portion. The flush toilet according to claim 5 , wherein the toilet bowl is formed so as to turn to the guide portion after passing through the front end of the portion.

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