JP2020169565A - Flush toilet bowl - Google Patents

Abstract

To provide a flush toilet bowl that gathers flushing water swirling on a sewage receiving surface toward a tip of a water storage part utilizing a fan-shaped recess formed to spread from the water storage part, thereby generating a relatively strong push-in flow and enhancing sewage flushing performance.SOLUTION: A flush toilet bowl 1 of the present invention includes: a bowl part 14 comprising a bowl-shaped sewage receiving surface 20, a rim part 22 formed at a top part of the sewage receiving surface, and a water storage part 26 formed below the sewage receiving surface; a drainage channel 18 having an inlet port connected to the water storage part and draining sewage; and water discharge ports 28, 30 discharging flushing water onto the bowl part and forming a swirling water flow on the sewage receiving surface. The sewage receiving surface of the bowl part has a fan-shaped recess 36 formed to spread from the water storage part, between a tip 20a of the sewage receiving surface 20 and a tip 26a of the water storage part 26.SELECTED DRAWING: Figure 2

Description

The present invention relates to a flush toilet, and more particularly to a flush toilet that cleans the toilet with washing water supplied from a washing water source and discharges filth.

Conventionally, as shown in Patent Documents 1 to 3, for example, flush toilets without a Zet spout have been known in order to suppress manufacturing costs. In such a flush toilet, convex surfaces along the lateral direction are formed in both side regions, and convex or concave surfaces along the front-rear direction are formed in the front region and the rear region on the upper filth receiving surface. Is disclosed.

JP-A-2015-68126 JP-A-2015-68125 JP-A-2015-68127

However, in the water-washing toilets described in Patent Documents 1 to 3, when the washing water swirling on the filth receiving surface gradually flows down, the washing water is still dispersed on the filth receiving surface. There is a problem that the filth is not sufficiently discharged due to insufficient vertical agitation of the washing water in the basin by the pushing flow for pushing the filth into the reservoir.
Such a problem is that when the amount of washing water is reduced in response to the recent demand for water saving, the amount of washing water swirling on the sewage receiving surface is further reduced, so that the sewage is accumulated by pushing the sewage into the reservoir. The problem that the washing water in the water part is not sufficiently agitated in the vertical direction and the filth is not sufficiently discharged becomes more remarkable.

Therefore, the present invention has been made to solve the problems of the prior art, and the water pool portion is formed by a fan-shaped recess formed so as to spread the washing water swirling on the filth receiving surface from the water reservoir portion. It is an object of the present invention to provide a flush toilet that can generate a relatively strong pushing flow for pushing filth into the water reservoir and improve the filth discharge performance.

In order to achieve the above object, the present invention is a water-washing toilet bowl that cleans the toilet bowl with washing water supplied from a washing water source and discharges filth, and has a bowl-shaped filth receiving surface and the filth receiving surface. A bowl part having a rim part formed on the upper part of the sewage part and a water collecting part formed below the filth receiving surface, a drainage channel whose inlet is connected to the water collecting part to discharge filth, and a bowl part. A spout portion that discharges wash water to form a swirling flow on the filth receiving surface is provided, and the filth receiving surface of the bowl portion is between the tip of the filth receiving surface and the tip of the water reservoir. , It is characterized by forming a fan-shaped recess formed so as to spread from the water reservoir.
In the present invention configured in this way, the cleaning water swirling on the filth receiving surface can be easily guided from a relatively wide area toward the water storage portion by the fan-shaped recess formed so as to spread from the water storage portion. The wash water guided by the fan-shaped recess can be collected toward the tip of the water reservoir, which can generate a relatively strong push-in flow that pushes the filth into the water reservoir, improving the filth discharge performance. Can be improved.

In the present invention, preferably, the radius of curvature of the central bottom surface of the recess in the cross section in the left-right direction of the recess of the filth receiving surface of the bowl portion decreases from the tip of the filth receiving surface toward the tip of the water reservoir. Is formed in.
In the present invention configured as described above, since the radius of curvature of the central bottom surface of the recess is formed so as to decrease from the tip of the filth receiving surface toward the tip of the water reservoir, the fan-shaped recess is formed. In the region on the tip side of the filth receiving surface, the radius of curvature of the central bottom surface of the recess is relatively large, it is possible to make it relatively easy to maintain the swirling flow of the washing water, and the pooled portion of the fan-shaped recess. In the region on the tip end side, the radius of curvature of the central bottom surface of the recess is relatively small, and the swirling flow of the washing water can be more easily guided toward the reservoir portion. Therefore, the swirling flow is maintained in the region on the tip side of the filth receiving surface of the recess, and in the region on the tip side of the water reservoir, the washing water is collected in the water reservoir direction within a relatively small number of laps of the swirling flow. It is possible to form a collective flow that is collected as a flow toward the water reservoir and toward the water reservoir. In addition, the flow of wash water directed toward the water reservoir in the recess extends to the tip of the water reservoir along the central bottom surface having the smallest radius of curvature in the region near the tip of the water reservoir. Collected towards. Therefore, it is possible to generate a stronger pushing flow that pushes the filth into the water reservoir, and the filth discharge performance can be further improved.

In the present invention, the recess of the filth receiving surface of the bowl portion is preferably formed as a fan shape formed by a central angle in the range of 30 degrees to 120 degrees.
In the present invention configured as described above, since the concave portion is formed as a fan shape formed by a central angle in the range of 30 degrees to 120 degrees, the washing water swirling on the filth receiving surface is formed from 30 degrees to 120 degrees. A fan-shaped recess formed by a central angle in the range of 120 degrees makes it easier to guide from a relatively wide area toward the reservoir, and the wash water guided by the recess is collected toward the tip of the reservoir. As a result, a stronger pushing flow than pushing the filth into the reservoir can be generated, and the filth discharge performance can be improved.

In the present invention, preferably, the concave portion of the filth receiving surface of the bowl portion has a radius of curvature of the central bottom surface of the concave portion in the cross section in the left-right direction near the tip portion of the water reservoir portion in the range of 10 to 120.
In the present invention configured as described above, among the washing water swirling on the filth receiving surface, the washing water of the swirling flow near the tip of the water reservoir has a radius of curvature of the central bottom surface in the range of 10 to 120. The formed recesses make it easier to guide the water toward the reservoir, and the flow of wash water directed toward the reservoir in the recess is 10 in the region near the tip of the reservoir. It is more reliably collected toward the tip of the water reservoir along the central bottom surface having a radius of curvature in the range of ~ 20. Therefore, it is possible to generate a stronger pushing flow than pushing the filth into the water reservoir, and the filth discharge performance can be improved.

In the present invention, preferably, the height of the recess of the filth receiving surface of the bowl portion from the central bottom surface of the recess to the shelf portion provided at the upper end of the filth receiving surface is such that the height from the tip of the filth receiving surface to the accumulated water is set. It is formed so as to increase toward the tip of the portion.
In the present invention configured in this way, the height of the recess from the central bottom surface to the shelf provided at the upper end of the filth receiving surface is from the tip of the filth receiving surface to the tip of the water reservoir. Since it is formed so as to increase toward the shelf, the height from the central bottom surface of the recess to the shelf is relatively small in the region of the fan-shaped recess on the tip side of the filth receiving surface, and the swirling flow of the washing water Is relatively easy to maintain, and in the area of the fan-shaped recess on the tip side of the water reservoir, the height from the central bottom surface of the recess to the shelf is relatively large, and the swirling flow of wash water Can be more easily guided toward the reservoir. Therefore, the swirling flow is maintained in the region on the tip side of the filth receiving surface of the recess, and in the region on the tip side of the water reservoir, the washing water is collected in the water reservoir direction within a relatively small number of laps of the swirling flow. It is possible to form a collective flow that is collected as a flow toward the water reservoir and toward the water reservoir. Therefore, it is possible to generate a stronger pushing flow that pushes the filth into the water reservoir, and the filth discharge performance can be further improved.

According to the flush toilet of the present invention, the flush water swirling on the filth receiving surface is collected toward the tip of the water reservoir by a fan-shaped recess formed so as to spread from the water reservoir, thereby collecting the water. It is possible to generate a relatively strong pushing flow that pushes filth into the part, and it is possible to improve the filth discharge performance.

It is an overall schematic showing the flush toilet according to one Embodiment of this invention. It is a top view which shows the urinal body of the flush toilet according to one Embodiment of this invention. It is sectional drawing of the flush toilet seen along the line III-III of FIG. It is a schematic perspective view which looked at the concave part of the bowl part of the flush toilet according to one Embodiment of this invention from the left rear of the toilet body body. It is sectional drawing of the bowl part of the flush toilet seen along the VV line of FIG. It is sectional drawing of the bowl part of the flush toilet seen along the VI-VI line of FIG. It is sectional drawing of the bowl part of the flush toilet seen along the line VII-VII of FIG. It is sectional drawing of the bowl part of the flush toilet seen along the line VIII-VIII of FIG. It is sectional drawing of the bowl part of the flush toilet seen along the IX-IX line of FIG. It is sectional drawing of the bowl part of the flush toilet as seen along the X-ray line of FIG. Regarding the recess of the filth receiving surface of the flush toilet according to the embodiment of the present invention, the cross section seen along the VI-VI line, the cross section seen along the VII-VII line, and the cross section seen along the VIII-VIII line. It is a figure which shows the height from the central bottom surface of the recess to the shelf, and the radius of curvature R of the recess for each of the cross sections viewed along the IX-IX line. It is a top view which shows the flow of the washing water on the toilet body of the flush toilet according to one Embodiment of this invention.

Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall schematic view showing a flush toilet according to an embodiment of the present invention. Hereinafter, in the description of the embodiment of the present invention, the right side of the toilet bowl body 2 when viewed from the front is the right side, and the left side when viewed from the front is the left side. The center line C is a center line that bisects the toilet body 2 in the left-right direction.
The flush toilet according to the embodiment of the present invention is a flush toilet (wash-down flush toilet) that flushes filth by the running water action due to the drop of water in the bowl portion. In addition, this embodiment can be applied to a siphon type flush toilet other than a wash-off type flush toilet.

As shown in FIG. 1, the flush toilet 1 according to the embodiment of the present invention stores the toilet body 2 attached to the front surface of the wall surface 3 and the flush water source attached to the upper back surface of the wall surface 3. It is equipped with a water storage tank 6. An operation switch 8 is attached to the surface of the wall surface 3. The water storage tank 6 and the toilet body 2 are connected by a connecting pipe 10, and when the operation switch 8 is turned on, the washing water in the water storage tank 6 is supplied to the toilet body 2 through the connecting pipe 10. ing. In the present embodiment, the toilet bowl body 2 is made of pottery, but may be made of resin.

Further, a drain pipe 12 for discharging filth is attached to the back surface of the wall surface 3, and the drain pipe 12 is connected to the toilet body 2 so that the filth in the toilet body 2 is discharged. There is.

Further, in the flush toilet 1 of the present embodiment, a water-saving type flush toilet in which the amount of flush water supplied from the water storage tank 6 is in the range of 3 liters to 6.5 liters, more preferably 3.8 liters to 6 It can be used for water-saving flush toilets in the range of 5.5 liters, and more preferably in the range of 4.8 liters to 6 liters. The water supply device indicated by the water storage tank 6 may be a water storage tank such as a tightly closed tank or a tank with a built-in pottery integrated with a toilet bowl, or another water supply device such as a flush valve capable of supplying a specified amount of washing water. ..

Next, the structure of the toilet bowl body of the flush toilet according to the embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG. 2 is a plan view showing a flush toilet body according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the flush toilet as seen along lines III-III of FIG.

As shown in FIGS. 2 and 3, the toilet body 2 of the flush toilet 1 according to the embodiment of the present invention has a bowl portion 14 formed in front of the flush toilet body 1, and flush water from the water storage tank 6 is placed in the upper rear portion thereof. A common headrace 16 for supplying to the bowl portion 14 is formed, and a drain trap pipeline 18 (drainage channel) for discharging filth is further formed in the lower rear portion.

The bowl portion 14 is a bowl-shaped filth receiving surface 20, a rim portion 22 formed on the upper portion of the filth receiving surface 20, and a reservoir formed below the filth receiving surface 20 to form a recessed portion for storing accumulated water. It has a water part 26.
The filth receiving surface 20 is provided with a shelf portion 24 forming a flat surface at the upper end portion thereof. The shelf portion 24 is formed substantially horizontally to swirl the washing water, and substantially goes around the upper end portion of the filth receiving surface 20. The rim portion 22 is formed with an inner peripheral surface 22a extending in the vertical direction from the outer end of the shelf portion 24.
The height of the shelf portion 24 in the present embodiment is formed to be substantially constant over the entire circumference, but the height of the shelf portion 24 may be formed so as to descend toward the front side, or It may be formed to have different inclined portions by other methods. Further, in the shelf portion 24 of the present embodiment, the right shelf portion 24 and the left shelf portion 24 are formed at substantially the same height in each cross section in the left-right direction orthogonal to the center line C as described later. ing.

Further, a first spout 28 (spout) is formed on the slightly rear side of the central portion on the left side when viewed from the front of the inner peripheral surface 22a of the rim portion 22 of the bowl portion 14, and the bowl on the right side when viewed from the front. A second spout 30 (spout portion) is formed on the rear side of the portion 14. The first spout 28 discharges the washing water onto the shelf portion 24 toward the front of the bowl portion 14. The second spout 30 discharges wash water toward the rear of the bowl portion 14, and the first spout 28 and the second spout 30 form a swirling flow in the same counterclockwise direction on the filth receiving surface 20. It is designed to do.
Here, the flush toilet 1 according to the present embodiment does not have a jet spout that directly injects and supplies flush water to the reservoir 26 of the bowl portion 14 and the inlet 18a of the drain trap pipeline 18 described later. It is a flush toilet.

The common headrace 16 branches into a first headrace 32 and a second headrace 34 toward the front of the toilet bowl. The first headrace 32 supplies the wash water to the first spout 28, and the second headrace 34 supplies the wash water to the second spout 30.
In the flush toilet 1 according to the present embodiment, the first headrace 32 including the first spout 28 and the second headrace 34 including the second spout 28 are formed integrally with the pottery body 2 made of earthenware. However, the present invention is not limited to such flush toilets, and the first headrace and the second headrace may be formed by a distributor or the like separate from the toilet bowl body.
Further, in the flush toilet bowl 1 according to the present embodiment, the common headrace 16 is branched into the first headrace 32 and the second headrace 34, and the wash water is supplied to the first spout 28 by the first headrace 32. However, the washing water is supplied to the second spout 30 by the second headrace 34, but the present invention is not limited to such a flush toilet, and the second headrace 34 and the second spout are not limited to this. 30 may be omitted, and the common headrace 16 may be formed so as to be connected only to the first headrace 32 and the wash water is supplied only to the first spout 28 by the first headrace 32. Further, the positions of the first spout 28 and the second spout 30 in the flush toilet 1 according to the present embodiment, and the first in the case where the flush toilet 1 according to another embodiment has only the first spout 28. The position of the spout 28 can be changed to any position on the inner circumference of the rim portion 22.

The water reservoir 26 of the bowl portion 14 described above has a substantially triangular shape when viewed from above, a tapered shape on the front side, and an arc shape on the rear side. The tip portion 26a of the water reservoir portion 26 forms the most tip portion of the water reservoir portion 26 on the center line C, and is connected to the recess 36 of the filth receiving surface 20 described later.

The drain trap pipeline 18 described above extends diagonally upward from the inlet 18a opened at the bottom of the water reservoir 26, passes through the highest point 18b, and then extends rearward and is connected to the drain pipe 12.
Here, the pooled water level L of the pool portion of the flush toilet 1 is determined by the height of the highest point 18b of the drain trap pipeline 18.

Next, the filth receiving surface 20 of the bowl portion 14 described above will be described in detail with reference to FIGS. 4 to 11. FIG. 4 is a schematic perspective view of the recess of the bowl portion of the flush toilet according to the embodiment of the present invention as viewed from the left rear side of the toilet body, and FIG. 5 is a flush view seen along the VV line of FIG. It is a cross-sectional view of the bowl part of the toilet bowl, FIG. 6 is a cross-sectional view of the bowl part of the flush toilet as seen along the VI-VI line of FIG. 2, and FIG. 7 is a cross-sectional view of the bowl part of the toilet bowl. It is a cross-sectional view of the bowl part of the flush toilet as seen, FIG. 8 is a cross-sectional view of the bowl part of the flush toilet as seen along the line VIII-VIII of FIG. 2, and FIG. 9 is the IX- of FIG. It is a cross-sectional view of the bowl part of the flush toilet seen along the IX line, FIG. 10 is the cross-sectional view of the bowl part of the flush toilet seen along the XX line of FIG. 2, and FIG. 11 is a book. Regarding the recess of the filth receiving surface of the flush toilet according to the embodiment of the present invention, the cross section seen along the VI-VI line, the cross section seen along the VII-VII line, the cross section seen along the VIII-VIII line, and It is a figure which shows the height from the central bottom surface of the recess to the shelf portion, and the radius of curvature R of the recess for each of the cross sections viewed along the IX-IX line.

In order to clearly show how the recess 36 is inclined in FIGS. 4 and 6 to 9, the cross section of the bowl portion 14 when cut along the VV line of FIG. 2 in each of the drawings. A virtual line S5 (corresponding to the contour of the cross section of the bowl portion 14 shown in FIG. 5) indicating the position, and a virtual line indicating the position of the cross section of the bowl portion 14 when cut along the VI-VI line of FIG. Line S6 (corresponding to the contour of the cross section of the bowl portion 14 shown in FIG. 6) and virtual line S7 (FIG. 6) indicating the position of the cross section of the bowl portion 14 when cut along the VII-VII line of FIG. Specified by (corresponding to the contour of the cross section of the bowl portion 14 shown by FIG. 7), and a virtual line S8 (shown by FIG. 8) indicating the position of the cross section of the bowl portion 14 when cut along the line VIII-VIII of FIG. The virtual line S9 (corresponding to the contour of the cross section of the bowl portion 14) and the virtual line S9 (corresponding to the contour of the cross section of the bowl portion 14) indicating the position of the cross section of the bowl portion 14 when cut along the IX-IX line of FIG. Corresponds to the contour of the cross section).

Here, the cross-sectional view of the V-V cross section, the cross-sectional view of the VI-VI cross section, the cross-sectional view of the VII-VII cross section, the cross-sectional view of the VIII-VIII cross section, and the cross-sectional view of the IX-IX cross section are the filth receiving surface 20. FIG. 5 is a cross-sectional view at a position where the length from the shelf portion 24 of the filth receiving surface tip portion 20a (the tip portion of the filth receiving surface) to the tip portion 26a of the water collecting portion 26 is divided into four equal parts. More specifically, in each of the above-mentioned cross-sectional views, from the position corresponding to the shelf portion 24 of the filth receiving surface tip portion 20a of the filth receiving surface 20 to the position corresponding to the tip portion 26a of the water reservoir portion 26 on the center line C. It is each cross-sectional view at the position which divides the length into 4 equal parts.
Therefore, in the center line C, the position corresponding to the shelf portion 24 of the filth receiving surface tip portion 20a of the filth receiving surface 20 is set to 0, and the position corresponding to the tip portion 26a of the water collecting portion 26 is set to 100. The ratio of the positions of each cross section is 0 for the V-V cross section, 25 for the VI-VI cross section, 50 for the VII-VII cross section, 75 for the VIII-VIII cross section, and IX. The cross-sectional position of the -IX cross section is shown as 100.

The filth receiving surface 20 of the bowl portion 14 is a concave portion formed in a fan shape so as to extend from the water collecting portion 26 between the filth receiving surface tip portion 20a of the filth receiving surface 20 and the tip portion 26a of the water collecting portion 26. 36 is formed. The recess 36 of the filth receiving surface 20 is formed on the front side of the filth receiving surface 20 and on the front side of the water storage portion 26. The fan-shaped recess 36 is formed so as to radiate toward the front side with the tip portion 26a of the water reservoir portion 26 as the central portion. In other words, the recess 36 forms a funnel shape. The recess 36 is formed so that the width in the left-right direction gradually decreases from the shelf portion 24 of the filth receiving surface tip portion 20a toward the tip portion 26a of the water storage portion 26. The recess 36 is formed so as to be recessed downward from the flat surface or slope of the filth receiving surface 20. Since the recess 36 forms a surface recessed one step from above the filth receiving surface 20, the cleaning water flowing into the recess 36 tends to stay in the recess 36. The washing water retained in the recess 36 is guided toward the water reservoir 26 as described later.

As shown in FIG. 10, in each cross section in the left-right direction orthogonal to the center line C, the tangent line t1 of the upper end portion 36a of the recess 36 and the connecting portion 20b of the filth receiving surface 20 connecting to the upper end 36a of the recess 36. The inflection point p1 (intersection of both tangents) at which the tangent line t2 of the above intersects is obtained. An imaginary line B connecting the inflection points p1 defined for each cross section in the front-rear direction indicates both ends of a fan-shaped region extending forward with the tip 26a of the water reservoir 26 as the center. (See FIGS. 2, 4 and 10). Therefore, the fan-shaped recesses 36 are formed between the virtual lines B. The recess 36 is formed symmetrically with respect to the center line C. The recess 36 is formed with a central bottom surface 36b forming the deepest portion of the recess 36 at a position on the center line C. The recess 36 may have a substantially single arc shape due to the radius of curvature forming the central bottom surface 36b in each of the cross sections in the left-right direction described below.

The central angle α between the two virtual lines B defining both ends of the fan-shaped region of the recess 36 as shown in FIG. 2 is defined in the range of 30 degrees to 120 degrees. Therefore, the recess 36 is formed as a fan shape formed by a central angle in the range of 30 degrees to 120 degrees, preferably 30 degrees to 90 degrees. For example, the recess 36 is formed as a fan shape having a central angle of 62 degrees.

As shown in FIG. 4, in each cross section in the left-right direction orthogonal to the center line C, the recess 36 of the filth receiving surface 20 is provided at the upper end portion of the filth receiving surface 20 from the central bottom surface 36b at the center of the recess 36. The height to the shelf portion 24 is formed so as to increase from the shelf portion 24 of the filth receiving surface tip portion 20a toward the tip portion 26a of the water storage portion 26. In FIG. 4, in order to show the height position of the shelf portion 24 in an easy-to-understand manner, a reference line D connecting the left and right shelf portions 24 of the toilet bowl main body 2 is shown. In the present embodiment, the heights of the four reference lines D shown in FIG. 4 are substantially the same, but the heights of the respective reference lines D may be slightly changed. Good. Also in this case, the relationship that the height from the central bottom surface 36b to the shelf portion 24 (reference line D) increases from the filth receiving surface tip portion 20a to the tip portion 26a is satisfied.
Since the shelf portion 24 is provided at substantially the same height as the lower end portion 22b of the rim portion 22, the recess 36 of the filth receiving surface 20 is the central bottom surface of the center of the recess 36 in each cross section as described above. The height from 36b to the lower end portion 22b of the rim portion 22 is also formed so as to increase from the shelf portion 24 of the filth receiving surface tip portion 20a of the filth receiving surface 20 toward the tip portion 26a of the water collecting portion 26. ..
The central bottom surface 36b of the recess 36 is formed so as to gradually descend from the shelf portion 24 of the filth receiving surface tip portion 20a of the filth receiving surface 20 toward the tip portion 26a of the water collecting portion 26 along the center line C. Has been done.

At the position of the VV cross section (cross section seen along the VV line, the same applies hereinafter) as shown in FIGS. 4 and 5, the central bottom surface 36b of the recess 36 coincides with the shelf portion 24. It has become. In the VI-VI cross section as shown in FIGS. 4 and 6, the height h1 from the central bottom surface 36b of the recess 36 to the shelf portion 24 is formed to be about 20 mm (see FIG. 11). In the VII-VII cross section as shown in FIGS. 4 and 7, the height h2 from the central bottom surface 36b of the recess 36 to the shelf portion 24 is formed to be about 38 mm (see FIG. 11). In the VIII-VIII cross section as shown in FIGS. 4 and 8, the height h3 from the central bottom surface 36b of the recess 36 to the shelf portion 24 is formed to be about 52 mm (see FIG. 11). In the IX-IX cross section as shown in FIGS. 4 and 9, the height h4 from the central bottom surface 36b of the recess 36 to the shelf portion 24 is formed to be about 68 mm (see FIG. 11). The height from the central bottom surface 36b to the shelf portion 24 is from the filth receiving surface tip portion 20a of the filth receiving surface 20 to the tip portion 26a of the water reservoir portion 26, as shown in the above-mentioned relationship of h1 <h2 <h3 <h4. It is gradually increasing toward.

As shown in FIG. 9, the position of the central bottom surface 36b of the recess 36 on the virtual line S5 at the position cut along the VV line, and the recess 36 on the virtual line S6 at the position cut along the VI-VI line. The position of the central bottom surface 36b, the position of the central bottom surface 36b of the recess 36 on the virtual line S7 at the position cut along the VII-VII line, and the recess 36 on the virtual line S8 at the position cut along the VIII-VIII line. The positions of the central bottom surface 36b of the above are arranged in the descending positions in order, and the position of the central bottom surface 36b of the recess 36 on the virtual line S9 at the position cut along the IX-IX line is the most compared to these positions. It is placed in a low position.

In the recess 36 of the filth receiving surface 20, the radius of curvature of the central bottom surface 36b of the recess 36 in the cross section in the left-right direction decreases from the filth receiving surface tip 20a of the filth receiving surface 20 toward the tip 26a of the water reservoir 26. It is formed like this. The recess 36 forms an inverted triangular recess shape in each cross section in the left-right direction.

In the VV cross section as shown in FIGS. 4 and 5, the central bottom surface 36b of the recess 36 is formed as a substantially flat surface that coincides with the shelf portion 24.
As shown in FIGS. 6 and 11, in the VI-VI cross section, the radius of curvature R1 of the central bottom surface 36b of the recess 36 is formed to be about 115R. The radius that defines the corresponding curvature is about 115 mm.
As shown in FIGS. 7 and 11, in the VII-VII cross section, the radius of curvature R2 of the central bottom surface 36b of the recess 36 is formed to be about 85R. The radius defining the corresponding curvature is about 85 mm.
As shown in FIGS. 8 and 11, in the VIII-VIII cross section, the radius of curvature R3 of the central bottom surface 36b of the recess 36 is formed to be about 64R. The radius that defines the corresponding curvature is about 64 mm.

As shown in FIGS. 9 and 11, in the IX-IX cross section, the radius of curvature R4 of the central bottom surface 36b of the recess 36 is formed to be about 15R. The radius that defines the corresponding curvature is about 15 mm. The radius of curvature of the central bottom surface 36b of the concave portion 36 is directed from the filth receiving surface tip portion 20a of the filth receiving surface 20 to the tip portion 26a of the water reservoir portion 26, as shown in the above-mentioned relationship of R1> R2> R3> R4. Is gradually decreasing. Further, as shown in FIGS. 6 to 9, since the central bottom surface 36b of the concave portion 36 has a relationship of R1> R2> R3> R4, it is located in the left-right direction at a position at a predetermined height from the lowermost portion 36c of the central bottom surface 36b. The width of the flow path is gradually reduced from the tip portion 20a of the filth receiving surface toward the tip portion 26a of the water reservoir portion 26. As shown in FIG. 9, the recess 36 has a radius of curvature of the central bottom surface 36b of the recess 36 in the range of 10 to 20 in the left-right cross section (IX-IX cross section) near the tip 26a of the water reservoir 26. Has been

Next, the operation of the flush toilet according to the embodiment of the present invention will be described mainly with reference to FIG. FIG. 12 is a plan view showing the flow of washing water on the toilet bowl body of the flush toilet according to the embodiment of the present invention.

When the user turns on the operation switch 8 (see FIG. 1), the washing water in the water storage tank 6 flows into the common headrace 16 via the connecting pipe 10, and the first headrace 32 branched from the common headrace 16 And reaches the second headrace 34, and the washing water is discharged from each of the first spout 28 and the second spout 30.

The washing water discharged from the first spout 28 is discharged onto the shelf 24 formed on the filth receiving surface 20, and mainly forms a swirling flow that swirls the shelf 24 as shown by arrow F1. To do.
The washing water discharged from the second spout 30 is discharged onto the shelf 24 formed on the filth receiving surface 20, and mainly forms a swirling flow that swirls the shelf 24 as shown by arrow F2. To do.
At this time, the washing water gradually flowing down from the shelf portion 24 on the filth receiving surface 20 is on the lower side of the shelf portion 24 on the filth receiving surface 20 as shown by arrows F3, F4, F5, F6, F7 and F8. Form a swirling flow in.

At this time, since the fan-shaped recess 36 is formed on the filth receiving surface 20, as shown in F9, F10, F11 and F12, the center direction of the recess 36 (center line C) is from the vicinity of both ends of the fan-shaped recess 36. Direction) and the flow toward the tip 26a of the water reservoir 26 are likely to be formed. Further, since the inflection point p1 (and the virtual line B connecting the inflection point p1) exists at both left and right ends of the fan-shaped recess 36, the flow velocity and the flow of the washing water passing over the inflection point p1 are affected. An opportunity to give a change in the flow direction, for example, a decrease in the flow velocity and an increase in the flow component toward the reservoir 26 occurs, and the direction and / or the reservoir portion of the central bottom surface 36b is adjusted according to the inclination of the bottom surface in the recess 36. A flow is formed that collects in 26 directions.

Since the recess 36 is formed as a fan shape formed by a central angle α in the range of 30 degrees to 120 degrees, the washing water swirling on the filth receiving surface 20 is shown by arrows F9, F10, F11 and F12. In addition, it collects from a relatively wide area that extends radially with a central angle in the range of 30 to 120 degrees and forms a flow that guides it toward the water reservoir 26.

Further, in the recess 36 on the filth receiving surface 20, the radius of curvature of the central bottom surface 36b of the recess 36 in the cross section in the left-right direction decreases from the filth receiving surface tip 20a toward the tip 26a of the water reservoir 26. Since it is formed, the radius of curvature R1 of the central bottom surface 36b is relatively large in the region of the fan-shaped recess 36 on the tip portion 20a side of the filth receiving surface, and the washing water flowing into the recess 36 is along the radius of curvature R1. After flowing down to the central bottom surface 36b, it smoothly rises again and easily flows out, so that it is possible to form a flow in which the swirling flow of the washing water is relatively maintained. Further, in the region of the fan-shaped recess 36 on the tip 26a side of the water reservoir 26, for example, the radius of curvature R4 (for another example, the radius of curvature R2, R3) of the central bottom surface 36b is relatively small, and the inside of the recess 36. After the washing water flowing into the center bottom surface 36b flows down, the direction is suddenly changed along the radius of curvature R4 and rises again to make it difficult for the washing water to flow out. Therefore, the washing water is stopped in the recess 36 and the direction of flow is changed. The direction of the water reservoir 26 can be changed, so that the swirling flow of the washing water can be more easily guided toward the water reservoir 26. Therefore, the swirling flow is maintained in the region of the recess 36 on the tip portion 20a side of the filth receiving surface, and the swirling flow is relatively small in the region of the water reservoir 26 on the tip portion 26a side of the filth receiving surface tip portion 20a side. It is possible to collect the wash water as a flow toward the water storage portion 26 within the number of laps, and form a collective flow toward the water storage portion 26.
Further, the flow of the washing water directed in the direction of the reservoir 26 in the recess 36 has the most reduced radius of curvature R4 in the region near the tip 26a, for example, the center having a radius of curvature in the range of 10 to 20. It is concentrated near the center line C along the bottom surface 36b, and flows down toward the tip portion 26a.

Further, the height of the recess 36 on the filth receiving surface 20 from the central bottom surface 36b to the shelf portion 24 provided at the upper end of the filth receiving surface 20 is from the filth receiving surface tip portion 20a to the tip of the water collecting portion 26. Since it is formed so as to increase toward the portion 26a, the height from the central bottom surface 36b of the recess 36 to the shelf portion 24 is relatively high in the region of the fan-shaped recess 36 on the tip portion 20a side of the filth receiving surface. Since the washing water that has flowed into the recess 36 is small and once flows down to the central bottom surface 36b, then rises again and easily flows out, it is possible to form a flow in which the swirling flow of the washing water is relatively maintained. Further, in the region of the fan-shaped recess 36 on the tip 26a side of the water reservoir 26, the height from the central bottom surface 36b of the recess 36 to the shelf 24 is relatively large, and the washing water that has flowed into the recess 36 once flows into the recess 36. After flowing down to the central bottom surface 36b, it rises again and becomes difficult to flow out, so that the washing water is stopped in the recess 36 and the direction of the flow is changed to the water collecting portion 26, so that the swirling flow of the washing water is stored. It will lead more toward the part 26.
Therefore, the swirling flow is maintained in the region of the recess 36 on the tip portion 20a side of the filth receiving surface, and the swirling flow is relatively small in the region of the water reservoir 26 on the tip portion 26a side of the filth receiving surface tip portion 20a side. It is possible to collect the wash water as a flow toward the water storage portion 26 within the number of laps, and form a collective flow toward the water storage portion 26.
Further, since the central bottom surface 36b is formed so as to descend toward the tip end portion 26a of the water storage portion 26 (downward inclination is formed), the recess 36 is collected on the central bottom surface 36b. The flow is accelerated toward the tip 26a of the water reservoir 26 to form a flow.

Therefore, among the swirling flows of the washing water that are about to pass through the fan-shaped recess 36 on the filth receiving surface 20, the proportion of the flow of the washing water directed toward the water reservoir 26 in the recess 36 is increased to provide the washing water. It can be collected and flowed from the recess 36 to the water reservoir 26.
Specifically, after the washing water changes its direction from the flow trying to swirl on the filth receiving surface 20 to the direction of the water reservoir 26 and the direction of the central bottom surface 36b in the recess 36, the arrows F13 and F14 As shown in the above, the water is collected along the central bottom surface 36b in the recess 36, and as shown by the arrow F15 (see FIGS. 12 and 3), from the lower end of the central bottom surface 36b of the recess 36 to the tip of the water reservoir 26. It forms a flow that flows intensively into 26a. Since the radius of curvature of the central bottom surface 36b of the recess 36 is gradually reduced from the filth receiving surface tip portion 20a toward the tip portion 26a of the water reservoir portion 26, the central bottom surface 36b is along the radius of curvature where the washing water is reduced. Collected on top. Basically, the flow of the washing water directed toward the water reservoir 26 in the recess 36 is combined into one mainstream on the central bottom surface 36b, so that the mainstream water flow into the tip 26a of the water reservoir 26. And the flow rate is increased compared to when the flow is dispersed around.

In FIG. 3, as shown by the arrow F16, the flow that intensively flows from the recess 36 to the tip 26a of the water reservoir 26 forms a vertical push-in flow, and the filth on the water reservoir 26 is pushed downward ( In order to generate a strong pushing force in the vertical direction), a force is generated to stir the washing water and filth (for example, floating filth) in the water reservoir 26 in the vertical direction, for example, stirring in the vertical direction as shown by arrow F17. Even in a flush toilet that forms a flow and does not have a water discharge port (Zet port) on the side of the sewage receiving surface 20 of the toilet body 2, sewage is efficiently pushed into the drain trap pipeline 18 and efficiently. It can be discharged.

Further, even when the amount of washing water is reduced due to the recent request for water saving, the washing water flowing on the recess 36 of the filth receiving surface 20 is discharged from the second lap of the swirl (for example, the first spout 28 or the like). The wash water is collected at a relatively early number of laps (the second lap), which is the turn after the wash water turns mainly on the shelf 24 on the first lap, and the wash water is collected from the recess 36 to the reservoir 26. By flowing, the washing water continues to swirl on the filth receiving surface 20, so that the washing water is dispersed and the force pushing into the water reservoir 26 is suppressed from being weakened, and the cleaning ability on the filth receiving surface 20 is improved. While maintaining it, it is possible to secure the pushing force of the washing water of the water reservoir 26.

According to the water-washing toilet bowl 1 according to the above-described embodiment, the washing water swirling on the filth receiving surface 20 is relatively spread on the filth receiving surface 20 by the fan-shaped recess 36 formed so as to spread from the water reservoir 26. It is possible to easily guide the water from a wide area toward the water storage part 26, and the washing water guided by the fan-shaped recess 36 is collected toward the tip of the water storage part 26, whereby filth is collected in the water storage part 26. A relatively strong pushing flow can be generated, and the filth discharge performance can be improved.

In the water-washing stool 1 according to the present embodiment, the radius of curvature of the central bottom surface 36b of the recess 36 decreases from the filth receiving surface tip 20a of the filth receiving surface 20 toward the tip 26a of the water reservoir 26. Since it is formed, the radius of curvature of the central bottom surface 36b of the recess 36 is relatively large in the region of the fan-shaped recess 36 on the filth receiving surface tip portion 20a side of the filth receiving surface 20, and the swirling flow of the washing water is compared. In the region of the fan-shaped recess 36 on the tip 26a side of the water reservoir 26, the radius of curvature of the central bottom surface 36b of the recess 36 is relatively small, so that the swirling flow of the washing water can be prevented. It can be made easier to guide toward the reservoir portion 26. Therefore, the swirling flow is maintained in the region of the filth receiving surface 20 of the recess 36 on the tip portion 20a side of the filth receiving surface, and the swirling flow is maintained in the region of the water collecting portion 26 on the tip portion 26a side. It is possible to collect the washing water as a flow toward the water reservoir 26 and form a combined flow toward the water storage part 26.
Further, the flow of the washing water directed toward the water reservoir in the recess 36 flows along the central bottom surface 36b having the smallest radius of curvature in the region near the tip 26a of the water storage part 26. Collected towards the tip 26a of 26. Therefore, a stronger pushing flow for pushing the filth into the water reservoir 26 can be generated, and the filth discharge performance can be further improved.

According to the water-washing toilet bowl 1 according to the present embodiment, the recess 36 is formed as a fan shape formed by a central angle α in the range of 30 degrees to 120 degrees, so that the washing water swirling on the filth receiving surface 20 can be used. , The fan-shaped recess 36 formed by the central angle α in the range of 30 degrees to 120 degrees makes it easy to guide the washing water from a relatively wide area toward the water reservoir 26, and the washing water guided by the recess 36 collects water. It is collected toward the tip of the portion 26, whereby a stronger pushing flow that pushes the filth into the pool portion 26 can be generated, and the filth discharge performance can be improved.

According to the water-washing toilet bowl 1 according to the present embodiment, among the washing water swirling on the filth receiving surface 20, the swirling flow of the washing water near the tip of the water reservoir 26 has a radius of curvature of 10 to 10 on the central bottom surface 36b. The recess 36 formed in the range of 120 (10R to 120R) makes it easier to guide the water toward the water reservoir 26, and further, the flow of the washing water directed toward the water reservoir in the recess 36 is increased. In the region near the tip 26a of the water reservoir 26, the water is more reliably collected toward the tip 26a of the water reservoir 26 along the central bottom surface 36b having a radius of curvature in the range of 10 to 20 (10R to 20R). .. Therefore, a stronger pushing flow than pushing the filth into the water reservoir 26 can be generated, and the filth discharge performance can be improved.

According to the water-washing toilet bowl 1 according to the present embodiment, the height of the recess 36 from the central bottom surface 36b to the shelf portion 24 provided at the upper end of the filth receiving surface 20 is the tip of the filth receiving surface 20. Since it is formed so as to increase from the portion 20a toward the tip portion 26a of the water collecting portion 26, in the region of the fan-shaped recess 36 on the filth receiving surface tip portion 20a side, the recess 36 The height from the central bottom surface 36b to the shelf portion 24 is relatively small, the swirling flow of the washing water can be relatively easily maintained, and the region of the fan-shaped recess 36 on the tip portion 26a side of the water reservoir portion 26. In, the height from the central bottom surface 36b of the recess 36 to the shelf portion 24 is relatively large, and the swirling flow of the washing water can be more easily guided toward the reservoir portion 26. Therefore, the swirling flow is maintained in the region of the filth receiving surface 20 of the recess 36 on the tip portion 20a side of the filth receiving surface, and the swirling flow is maintained in the region of the water collecting portion 26 on the tip portion 26a side. It is possible to collect the wash water as a flow toward the water reservoir 26 and form a combined flow toward the water reservoir. Therefore, a stronger pushing flow for pushing the filth into the water reservoir 26 can be generated, and the filth discharge performance can be further improved.

1 Flush toilet 2 Toilet bowl body 14 Bowl part 18 Drain trap pipeline 20 Sewage receiving surface 20a Sewage receiving surface tip 22 Rim 24 Shelf 26 Reservoir 26a Tip 28 1st spout 30 2nd spout 36 Recess α central angle

In order to achieve the above object, the present invention is a flush toilet that cleans the toilet bowl with the washing water supplied from the washing water source and discharges filth, and has a bowl-shaped filth receiving surface and the filth receiving surface. A bowl part having a rim part formed on the upper part of the toilet and a water collecting part formed below the filth receiving surface, a drainage channel whose inlet is connected to the water collecting part to discharge filth, and a bowl part. It is provided with a spout portion that discharges wash water to form a swirling flow on the filth receiving surface, and the filth receiving surface of the bowl portion is between the tip of the filth receiving surface and the tip of the water reservoir. , A fan-shaped recess is formed in a plan view formed so as to extend from the water reservoir , and the fan-shaped recess in a plan view of the filth receiving surface has ends extending in the front-rear direction on both sides in the lateral direction. In a cross section along the lateral direction orthogonal to the center line extending in the front-rear direction of the bowl portion, the upper end portion of the recess and the connection portion which is the lower end portion of the filth receiving surface connected to the recess are convex. It is connected by a curved surface, and this convex curved surface becomes the end of a fan-shaped recess, and the end of this recess is due to a turning point where the tangent that passes through the upper end of the recess and the tangent that passes through the connection of the filth receiving surface intersect. It is characterized in that it is formed so as to be located below a virtual line extending in the determined front-rear direction .
In the present invention configured in this way, the cleaning water swirling on the filth receiving surface can be easily guided from a relatively wide area toward the water storage portion by the fan-shaped recess formed so as to spread from the water storage portion. The wash water guided by the fan-shaped recess can be collected toward the tip of the water reservoir, which can generate a relatively strong push-in flow that pushes the filth into the water reservoir, improving the filth discharge performance. Can be improved. In particular, in the present invention, an inflection point where the end portions of the fan-shaped concave portions of the filth receiving surface, which are convex curved surfaces, intersect the tangent line passing through the upper end portion of the concave portion and the tangent line passing through the connecting portion of the filth receiving surface. Since it is formed so as to be located below the virtual line extending in the front-rear direction determined by, the flow velocity and the direction of the flow of the washing water are changed by this convex curved surface, and the washing water is more effective by the reservoir portion. It becomes easier to guide.

In the present invention, preferably, the concave portion of the filth receiving surface of the bowl portion is formed so that the radius of curvature of the central bottom surface of the concave portion in the cross section in the left-right direction near the tip portion of the water reservoir portion is in the range of 10 mm to 120 mm. There is.
In the present invention configured as described above, among the washing water swirling on the filth receiving surface, the washing water of the swirling flow near the tip of the water reservoir has a radius of curvature of 10 mm to 120 mm at the center bottom surface. The recess formed in the range makes it easier to guide the water toward the water reservoir, and the flow of the washing water directed toward the water reservoir in the recess is in the region near the tip of the water reservoir. , Along the central bottom surface having a radius of curvature in the range of 10 to 20, more reliably collected toward the tip of the water reservoir. Therefore, it is possible to generate a stronger pushing flow than pushing the filth into the water reservoir, and the filth discharge performance can be improved.

According to the water-washing urinal 1 according to the present embodiment, among the washing water swirling on the filth receiving surface 20, the swirling flow washing water near the tip of the water reservoir 26 has a radius of curvature of 10 mm on the central bottom surface 36b. The recess 36 formed in the range of about 120 mm (10R to 120R) makes it easier to guide the water toward the water reservoir 26, and further, the flow of the washing water directed toward the water reservoir in the recess 36. Is more reliable toward the tip 26a of the water reservoir 26 along the central bottom surface 36b having a radius of curvature in the range of 10 mm to 120 mm (10R to 120R ) in the region near the tip 26a of the water reservoir 26. Collected in. Therefore, a stronger pushing flow than pushing the filth into the water reservoir 26 can be generated, and the filth discharge performance can be improved.

Claims (5)

A flush toilet that cleans the toilet bowl with the wash water supplied from the wash water source and discharges filth.
A bowl portion having a bowl-shaped filth receiving surface, a rim portion formed on the upper portion of the filth receiving surface, and a water collecting portion formed below the filth receiving surface.
A drainage channel whose inlet is connected to the above water reservoir and discharges filth,
The bowl portion is provided with a spout portion that discharges washing water to form a swirling flow on the filth receiving surface.
The filth receiving surface of the bowl portion forms a fan-shaped recess formed so as to expand from the water collecting portion between the tip end portion of the filth receiving surface and the tip portion of the water collecting portion. A flush toilet that features that. In the concave portion of the filth receiving surface of the bowl portion, the radius of curvature of the central bottom surface of the concave portion in the cross section in the left-right direction decreases from the tip end portion of the filth receiving surface toward the tip end portion of the water reservoir portion. The flush toilet according to claim 1, which is formed. The flush toilet according to claim 1 or 2, wherein the recess of the filth receiving surface of the bowl portion is formed as a fan shape formed by a central angle in the range of 30 degrees to 120 degrees. Claim 1 in which the radius of curvature of the central bottom surface of the recess in the cross section in the left-right direction near the tip of the reservoir is formed in the range of 10 to 120 in the recess of the filth receiving surface of the bowl portion. The flush toilet according to any one of items 3 to 3. The height of the recess of the filth receiving surface of the bowl portion from the central bottom surface of the recess to the shelf provided at the upper end of the filth receiving surface is the height from the tip of the filth receiving surface to the reservoir. The flush toilet according to any one of claims 1 to 4, which is formed so as to increase toward the tip of the water portion.

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