JP7093507B2 - Washing toilet - Google Patents

Description

The present invention relates to a flush toilet, and more particularly to a wash-off type toilet that flushes the toilet body with wash water supplied from a wash water supply source and discharges filth.

Conventionally, for example, as described in Patent Document 1, in addition to the rim spout provided on the rim for cleaning the filth receiving surface of the bowl portion, in order to agitate the cleaning water in the reservoir portion of the recess. A flush toilet equipped with a jet spout is known. Further, in the flush toilet of Patent Document 1, two rim spouts, a first rim spout provided on the side of the bowl portion and a second rim spout provided behind the bowl portion, are used as rim spouts. It has a water outlet.

Japanese Unexamined Patent Publication No. 2011-058300

However, in the flush toilet as described in Patent Document 1 described above, since the jet spout is provided, the manufacturing process is complicated, and the cleanability is improved by the amount of the jet spout. There is the problem of getting worse. Further, since the two rim spouts are provided, it is possible to effectively agitate the washing water containing the filth accumulated in the reservoir of the recess, but cleaning is performed as compared with the case where there is only one rim spout. There is also the problem of worsening sex.

On the other hand, by providing only the rim spout and further using one rim spout, the manufacturing process is simplified and the cleaning property is improved, but the stirring action of the washing water containing filth is reduced in the bowl portion. There is a basic problem related to cleaning performance.

The present invention has been made to solve the above-mentioned problems of the prior art, and even when one rim water discharge portion is provided, the washing water containing filth is efficiently agitated to obtain filth. The purpose is to provide a flush toilet that can improve the discharge efficiency.

In order to achieve the above object, the present invention is a flush toilet that cleans the toilet bowl body with the wash water supplied from the wash water supply source and discharges filth, and has a bowl portion provided with a filth receiving surface. , The rim part formed on the upper edge of this bowl part and the rim water passage is formed inside, and the washing water supplied from the washing water supply source is discharged forward to form a swirling flow swirling on the filth receiving surface. It has one rim water discharge part , a shelf part through which the wash water discharged from this rim water discharge part flows, and a drain trap pipeline whose inlet is connected below the bowl part to discharge filth. The filth receiving surface of the bowl portion is provided with an upper filth receiving surface and a recess formed between the upper filth receiving surface and the drain trap pipeline, and the upper filth receiving surface has lateral regions on both sides thereof. The front and rear regions are formed by convex surfaces along the direction, and the front and rear regions are formed by convex or concave surfaces having a smaller curvature than the bilateral regions along the front-rear direction . It has a tapered shape that tapers from the center in the front-back direction or from the rear side to the front of this center, and the angle of the tapered shape formed by the left and right sides is the left and right sides of the recess and the rear rear surface of this side. It is characterized by being smaller than the angle formed by the trap.
In the flush toilet bowl having such a structure, the upper sewage receiving surface of the sewage receiving surface of the bowl portion is formed by convex surfaces on both sides thereof along the lateral direction, and the front area and the rear area thereof are formed along the front-rear direction. Since it is formed by a convex or concave surface with a curvature smaller than the bilateral region, the mainstream that flows into the concave portion from the front and the rear of the concave portion of the bowl portion even when the washing water is discharged from one rim water discharge portion. Can be formed. Specifically, the main flow of the washing water flowing in from the front of the recess generates a pushing flow into the drain trap pipeline, and the main flow of the washing water flowing in from the rear of the recess swirls in the lateral direction (horizontal direction). Generate a flow. As a result, according to the present invention, the washing water containing filth can be efficiently agitated in the recess of the bowl portion by the washing water discharged from one rim water discharge portion, and the filth discharge efficiency can be improved.
Further, since the angle of the tapered shape formed by the left and right side surfaces of the recess is smaller than the angle formed by the left and right side surfaces of the recess and the rear rear surface of this side surface, the front side region in the recess is narrowed, so that the inside of the recess is formed. In addition to being able to effectively form a vertical swirling flow, the speed of this vertical swirling flow can be increased. Therefore, the washing water containing filth (floating filth, etc.) can be effectively agitated by the vertical swirling flow and the horizontal swirling flow formed in the recess, and the filth discharge efficiency can be improved.

In the present invention, preferably, the shelf portion is located on the downstream side of the rim water discharge portion and the first shelf portion, and is located inside the first shelf portion and at a position lower than the first shelf portion. The second shelf provided is provided, and the first shelf is formed from the rim water discharge portion to the region behind the center of the recess in the anteroposterior direction and from the rear end of the upper filth receiving surface to the front. The second shelf is not formed in the area from the rear end of the second shelf to the rear end of the upper filth receiving surface.
According to the present invention configured as described above, the first shelf portion is formed from the rim water discharge portion to the region behind the center of the recess in the front-rear direction and in front of the rear end of the upper filth receiving surface, and further. Since the shelf portion is not formed in the region from the rear end of the shelf portion of 2 to the rear end of the upper filth receiving surface, a large mainstream of the washing water flowing in from the rear of the recess can be formed, so that the side of the recess can be formed. It is possible to strengthen the turning in the direction (horizontal direction), thereby increasing the efficiency of discharging the filth in the recess .

In the present invention, preferably, in the second shelf portion, the joint portion with the first shelf portion is vertical due to a step, and the joint portion between the second shelf portion and the upper filth receiving surface is the first. It is joined more smoothly than the joint between the shelf and the second shelf .
According to the present invention configured as described above, the shelf surface of the first shelf portion and the second shelf portion are separated from each other by the step between the first shelf portion and the second shelf portion. The washing water of the first shelf portion becomes difficult to reach the second shelf portion from the step due to the surface tension of the shelf surface of the first shelf portion. Thereby, the fast flow of the washing water flowing along the first shelf can generate a lateral swirling flow.
Further, since the joint portion between the second shelf portion and the upper filth receiving surface is smoothly joined as compared with the joint portion between the first shelf portion and the second shelf portion, the joint portion flows through the second shelf portion. The washed water can be pulled downward by surface tension until it flows down from the upper filth receiving surface into the recess, and can flow down at once. As a result, the kinetic energy of the washing water flowing into the recess can be effectively used to form a vertical swirling flow, so that the efficiency of discharging filth can be improved.

According to the water-washing toilet bowl of the present invention, even when one rim water discharge portion is provided, the washing water containing filth can be efficiently agitated to improve the filth discharge efficiency.

It is a schematic diagram which shows the state which is installed on the wall surface of the flush toilet according to the embodiment of this invention. It is a top view which shows the flush toilet by embodiment of this invention. It is a side sectional view of the flush toilet seen along the line III-III of FIG. It is a perspective view of the flush toilet of FIG. 2 seen from the rear diagonally above. It is a perspective view which looked at the flush toilet of FIG. 2 from the side from the upper side. It is a front sectional view of the flush toilet seen along the VI-VI line of FIG. It is a front sectional view of the flush toilet seen along the line VII-VII of FIG. It is a front sectional view of the flush toilet seen along the line VIII-VIII of FIG. It is a front sectional view of the flush toilet seen along the IX-IX line of FIG. It is a side perspective view which shows the state of the flow of the washing water in the flushing toilet according to the embodiment of this invention. It is a perspective view seen from above which shows the state of the flow of the washing water in the flushing toilet according to the embodiment of this invention.

Next, the flush toilet according to the embodiment of the present invention will be described with reference to the attached 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 showing a state of being installed on the wall surface of the flush toilet according to the embodiment of the present invention. As shown in FIG. 1, reference numeral 1 indicates a flush toilet bowl 1 according to the present embodiment, and the flush toilet bowl 1 discharges filth by utilizing a head due to a rise in the water level in a drain trap pipeline, which will be described later. It is a type flush toilet (washdown type toilet). In this embodiment, the flush toilet may be another type of toilet.

The flush toilet bowl 1 includes a toilet bowl body 2, and the toilet bowl body 2 is attached to a wall 4. A water storage tank 6 for storing wash 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 bowl main body 2, and the toilet bowl main body 2 is washed. Further, a drainage pipe 10 for discharging filth is provided on the back side of the wall 4, and the filth from the toilet bowl main body 2 is discharged to the outside by the drainage pipe 10.

Next, the flush toilet bowl 1 according to the present embodiment will be described in detail with reference to FIGS. 2 to 9. FIG. 2 is a plan view showing a flush toilet according to an embodiment of the present invention, FIG. 3 is a side sectional view of the flush toilet as seen along lines III-III of FIG. 2, and FIG. 4 is FIG. It is a perspective view of the flush toilet bowl viewed from diagonally above, and FIG. 5 is a perspective view of the flush toilet bowl of FIG. 2 viewed from above on the side. 6 to 9 are front sectional views of the flush toilet as seen along the VI-VI line, the VII-VII line, the VIII-VIII line, and the IX-IX line of FIG. 2, respectively.

As shown in FIGS. 2 and 3, the toilet body 2 of the flush toilet bowl 1 according to the embodiment of the present invention has a bowl portion 12 and a drain trap pipeline 14 extending from the bottom of the bowl portion 12 in communication with each other. 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. Further, the filth receiving surface 16 of the bowl portion 12 is provided with a bowl-shaped upper filth receiving surface 20 and a recess 22 formed between the upper filth receiving surface 20 and the drain trap pipeline 14.

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

Further, a water passage chamber 24 is formed in the rear portion of the toilet bowl main body 2, and the washing water is supplied to the water passage chamber 24 from the water storage tank 6 described above. The front side of the water passage chamber 24 extends to the rim portion 18 and is connected to the rim passage 26 formed inside the rim portion 18. When the toilet body 1 is viewed from the front, a rim spout 28 is formed on the inner peripheral side of the front region on the left side of the rim portion 18, the above-mentioned rim water passage 26 extends to the rim spout 28, and the washing water is rimmed. It is designed to be supplied to the spout 28. Washing water is discharged forward from the rim water discharge port 28 to form a swirling flow in the bowl portion 12.

Next, the shelf portion of the flush toilet bowl 1 will be described with reference to FIGS. 2 to 5. As shown in FIGS. 2 to 5, a first shelf portion 30 for flowing wash water is formed on the inner peripheral side of the rim portion 18 and on the downstream side of the rim spout port 28. The first shelf portion 30 is formed at the same level as the rim spout 28, and is a front region on the right side of the bowl portion 12 from the position of the rim spout 28 (the left front region of the bowl portion 12 when viewed from the front). Extends to.

Further, a second shelf portion 32 is formed between the rim portion 18 and the upper dirt receiving surface 20. The second shelf portion 32 is located inside the first shelf portion 30, and is provided at a position lower than the first shelf portion 30 via a step. As shown in FIG. 2, the second shelf portion 32 extends from the rear region on the left side when viewed from the front of the bowl portion 12 to the rear region on the right side via the front end. Specifically, in the second shelf portion 32, the left and right rear ends 32a and 32b are regions behind the center 22a in the front-rear direction of the recess 22 and in front of the rear end 20a of the upper dirt receiving surface 20. Extends to. Further, the second shelf portion 32 is formed at the same height position (level) along the length direction thereof. The shelf portion is not formed in the region between the rear ends 32a and 32b of the second shelf portion 32 and the rear end 20a of the upper filth receiving surface 20, and the shelf portion has a curved shape.
Here, the second shelf portion 32 is formed symmetrically, but may be formed asymmetrically, and is right side of the bowl portion which is the upstream side in the swirling direction of the washing water from the vicinity of the rim spout 28. It may be formed extending to the posterior region of. The upstream side of the swirling direction of the washing water refers to a portion where the swirling washing water substantially flows first on the upper filth receiving surface. Therefore, in the present embodiment, since the rim spout is located on the left side when viewed from the front of the bowl portion, a very small amount of washing water flows first to the upper waste receiving surface on the left side, but most of the washing water is on the right side rather than the left side. Since it flows to the upper filth receiving surface first, the upstream side in the swirling direction of the washing water is on the right side when comparing the left and right sides of the bowl portion.

Next, the surface shape of the upper dirt receiving surface 20 of the dirt receiving surface 16 of the bowl portion 12 will be described in detail with reference to FIGS. 2 to 9. As shown in FIG. 2, the upper dirt receiving surface 20 of the bowl portion 12 has a front region A, a rear region B, a right side region C, and a left side region D in a plan view.
The right side region C and the left side region D of the upper filth receiving surface 20 are formed by convex surfaces having the same curvature along the lateral direction (direction orthogonal to the front-rear direction of the toilet bowl body 1) (see FIGS. 8 and 9). The front region A is formed by concave surfaces along the front-rear direction (see FIG. 3), and the rear region B is formed by convex surfaces having a curvature smaller than the convex surfaces of the right side region C and the left side region D (see FIG. 2). ).

Here, the front region A may be formed by a convex surface having a curvature smaller than that of the right side region C and the left side region D along the front-rear direction, similarly to the rear region B. Further, the rear region B may be formed by a concave surface along the front-rear direction as in the front region A.
Further, the right side region C on the upstream side in the swirling direction of the washing water may be formed by a convex surface having a larger curvature along the lateral direction than the left side region D on the downstream side.

By forming the surface shape of the upper filth receiving surface 20 of the filth receiving surface 16 of the bowl portion 12 as described above, the details will be described later, but a part of the washing water discharged from the rim spout 28 is the bowl portion 12. A mainstream F1 that flows into the recess 22 from the front is formed, and a part of the washing water discharged from the rim spout 28 forms a mainstream F2 that flows into the recess 22 from the rear (FIG. 10, FIG. See FIG. 11).

Next, the recess 22 of the filth receiving surface 16 of the bowl portion 12 will be described in detail with reference to FIGS. 2, 3, and 8.
The recess 22 has a substantially triangular shape in a plan view, and has a tapered shape that tapers toward the front. 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 36a located in the front and a rear bottom surface 36b located in the rear. The front bottom surface 36a is formed to be shallower than the rear bottom surface 36b (see FIG. 3). Further, the rear bottom surface 36b is connected to the inlet 14a of the drain trap pipeline 14 described above.

Here, as shown in FIG. 8, the front bottom surface 36a of the recess 22 is formed in an R shape along the lateral direction. Specifically, in order to effectively form the vertical swirling flow V described later, it is preferable that the front bottom surface 36a is formed within the range of the radius of curvature R of 30 mm to 80 mm.

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

Next, the operation of the flush toilet according to the above-described embodiment of the present invention will be described mainly with reference to FIGS. 10 and 11. FIG. 10 is a side perspective view showing the flow of wash water in the flush toilet according to the embodiment of the present invention, and FIG. 11 is a side view showing the flow of wash water in the flush toilet according to the embodiment of the present invention. It is a perspective view seen from above which shows.

When the user turns on the operation switch 8, the washing water in the water storage tank 6 enters the water passage chamber 24 of the toilet bowl main body 2, and from this water passage chamber 24, through the rim water passage 26, and from the rim spout 28. , Water is discharged to the bowl portion 12.

The washing water discharged from the rim spout 28 first flows on the first shelf portion 30, then flows down to the second shelf portion 32, flows on the second shelf portion 32, and flows on the second shelf portion 32, and the bowl portion. Form a swirling flow within 12. At this time, a part of the washing water that has made one round in the bowl portion 12 flows through the inner peripheral side of the washing water discharged from the rim spout port 28, and becomes the mainstream F1 that flows diagonally forward into the recess 22.

Further, the washing water discharged from the rim water discharge port 28 flows on the second shelf portion 32, but the shelf portion is not formed in the rear end region of the upper filth receiving surface 20 and has a curved surface shape. , A part of the washing water becomes the mainstream F2 flowing into the recess 22 from diagonally rearward.

Next, the mainstream F1 flowing into the recess 22 from diagonally forward flows down along the side wall of the recess 22, turns upward by flowing along the front bottom surface 36a, rises along the side wall, and turns vertically. Form a flow V. Further, the main stream F1 generates a push flow into the drain trap pipeline 14.
On the other hand, the main flow F2 flowing into the recess 22 from diagonally rearward flows substantially horizontally along the side wall of the recess 22 to form a lateral swirling flow H.

As described above, in the flush toilet bowl 1 according to the present embodiment, filth is generated by the vertical swirl flow V and the horizontal swirl flow H formed in the recess 22 without providing the jet spout as in the conventional flush toilet bowl. The washing water containing the above can be effectively agitated, and the efficiency of discharging filth can be improved.

Hereinafter, the operation of the flush toilet bowl 1 according to the present embodiment will be specifically described. First, in the flush toilet bowl 1 according to the present embodiment, the upper sewage receiving surface 20 of the sewage receiving surface 16 of the bowl portion 12 is formed by a convex surface on the right side region C and the left side region D along the lateral direction. Since the front region A and the rear region B are formed by convex or concave surfaces having a curvature smaller than that of the bilateral regions along the front-rear direction, further cleaning is performed from one rim spout 28 without providing a jet spout. Even when water is discharged, the mainstreams F1 and F2 that flow into the recess 22 from the front and the rear of the recess 22 of the bowl portion 12 can be formed. Specifically, the main flow F1 of the washing water flowing in from the front of the recess 22 generates a pushing flow into the drain trap pipeline 14, and the main flow F2 of the washing water flowing in from the rear of the recess 22 is laterally (). A swirling flow H in the horizontal direction) is generated. As a result, according to the water-washing toilet bowl 1 according to the present embodiment, the washing water containing filth can be efficiently agitated in the recess 22 of the bowl portion 12 by the washing water discharged from the rim spout 28, and the filth discharge efficiency. Can be enhanced.

Next, in the flush toilet bowl 1 according to the present embodiment, the front region A of the upper filth receiving surface 20 of the bowl portion 12 is formed by a concave surface, and the rear region B has a curvature smaller than that of the right side region C and the left side region D. When it is formed by a convex surface, the mainstream F1 of the washing water flowing in from the front of the concave portion 22 can be formed to be larger, so that the pushing force into the drain trap pipeline 14 can be increased. Therefore, the efficiency of discharging filth can be further improved.

Next, in the flush urinal 1 according to the present embodiment, the right side region C on the upstream side of the upper filth receiving surface 20 of the bowl portion 12 in the swirling direction of the washing water is a convex surface having a larger curvature than the left side region D on the downstream side. In the case of being formed by, the mainstream F1 of the washing water flowing in from the front of the recess 22 can be formed to be larger, so that the pushing force into the drain trap pipeline 14 can be increased, thereby increasing the pushing force. , The efficiency of waste discharge can be further improved.

Next, in the flush toilet bowl 1 according to the present embodiment, since the rim spout 28 is provided on the front side of the rim portion 18, after the wash water discharged from the rim spout 28 makes a round turn, the rim spout 28 is swirled. Since the mainstream F1 that flows into the recess 22 from the front is formed, the entire area of the upper filth receiving surface 20 can be washed with more washing water, and the washing performance is improved.

Next, in the flush toilet bowl 1 according to the present embodiment, the region where the second shelf portion 32 is behind the center 22a in the front-rear direction of the recess 22 from the rim spout 28 and in front of the rear end 20a of the upper filth receiving surface 20. Since the shelf portion is not formed in the region from the rear end of the second shelf portion 32 to the rear end of the upper filth receiving surface 20, the amount of washing water flowing into the recess 22 from the rear is large. It is possible to more effectively swirl the washing water containing filth in the recess 22. As a result, according to the water-washing toilet bowl 1 according to the present embodiment, the washing water containing filth can be efficiently agitated in the recess 22 of the bowl portion 12 by the washing water discharged from one rim spout 28, and the filth Emission efficiency can be increased.

Next, in the water-washing stool 1 according to the present embodiment, the first shelf portion 30 provided in the region directly downstream of the rim spout 28 and the first shelf inside the first shelf portion 30 and the first shelf portion. Since the second shelf portion 32 provided at a position lower than the portion 30 is provided, the washing water discharged from the rim spout port 28 first flows on the first shelf portion 30, and then. Since the washing water flows on the second shelf 32 and swirls once, it is possible to prevent the washing water immediately after being discharged from the rim spout 28 from colliding with the washing water swirling once. ..

Next, in the water-washing stool 1 according to the present embodiment, since the first shelf portion 30 is formed from the rim spout 28 to the region in front of the center 22a in the front-rear direction of the recess 22, the first shelf portion 30 is formed from the rim spout 28. Since the discharged wash water flows on the first shelf portion 30 and then flows out onto the second shelf portion 32, the wash water swirled once on the second shelf portion 32 is the first. Since the flow of the washing water flowing out from the shelf 30 onto the second shelf 30 is strong, it flows along the inner peripheral side of this strong flow and flows into the recess 22 from the front. As a result, the mainstream F1 of the washing water flowing in from the front of the recess 22 can be formed to be larger, the pushing force into the drain trap pipeline 14 can be increased, and the filth discharge efficiency can be further improved.

Next, in the flush toilet bowl 1 according to the present embodiment, since the second shelf portion 32 is formed at the same height position along the length direction thereof, the washing water flowing on the second shelf portion 32 is formed. Can easily flow to the rear side, thereby forming a larger mainstream F2 of the washing water flowing in from the rear of the recess 22 and generating a larger lateral (horizontal) swirling flow, and discharging filth. The efficiency can be increased.

Next, in the flush toilet bowl 1 according to the present embodiment, the right side region C, the left side region D, and the front region A of the upper filth receiving surface 16 flow into the recess 22 from diagonally forward in a plan view. The recess 22 is configured to form the mainstream F1 and includes a side wall 34 and a front bottom surface 36a which are vertical swivel forming portions for vertically swirling the mainstream F1 which is formed in a tapered shape in a plan view and flows into the recess. Even when the wash water is discharged only from the rim water discharge port 28 without providing the jet water discharge port, a vertical swirling flow V is formed in the recess 22 to effectively stir the wash water containing filth in the recess 22. This can increase the efficiency of filth discharge.

Next, in the flush toilet bowl 1 according to the present embodiment, the inlet 14a of the drain trap pipeline 14 is connected to the rear side of the recess 22, and the side wall 34 and the front bottom surface 36a, which are the vertical swivel forming portions, are on the front side of the recess 22. Therefore, the vertical swirling flow V of the washing water can push the washing water containing the filth in the recess 22 into the drain trap pipeline 14, thereby increasing the filth discharge efficiency.

Next, in the flush toilet bowl 1 according to the present embodiment, since the front bottom surface 36a of the recess 22 is formed in an R shape along the lateral direction, the wash water flowing into the recess 22 can be smoothly swirled. The vertical swirl flow V can be effectively formed, thereby increasing the efficiency of discharging filth.

Next, in the flush toilet bowl 1 according to the present embodiment, since the front bottom surface 36a of the recess 22 is formed shallower than the rear bottom surface 36b, the kinetic energy of the washing water flowing into the recess 22 is effectively utilized. , A vertical swirl flow V can be formed, whereby the efficiency of discharging filth can be improved.

Next, in the flush toilet bowl 1 according to the present embodiment, since the recess 22 is formed in a tapered shape of 35 degrees to 70 degrees, the mainstream F1 flows in at an angle substantially orthogonal to the recess, so that the vertical swivel forming portion is formed. The side wall 34 and the front bottom surface 36a, which are the side walls 34, can effectively form a vertical swirling flow.

Next, in the flush toilet bowl 1 according to the present embodiment, since the radius of curvature of the R shape of the front bottom surface 36a of the recess 22 is 30 mm to 80 mm, the wash water flowing into the recess 22 can be swirled more smoothly. The vertical swirl flow V can be effectively formed, whereby the efficiency of discharging filth can be improved.

1 Washing toilet 2 Toilet bowl body 6 Water storage tank 12 Bowl part 14 Drain trap pipeline 16 Sewage receiving surface 18 Rim part 20 Upper sewage receiving surface 22 Recessed 26 Rim water passage 28 Rim spout 30 First shelf 32 Second Shelf 34 Wall surface 36 Bottom surface 36a Front bottom surface A Front area of upper filth receiving surface B Rear area of upper filth receiving surface C Right side area of upper filth receiving surface D Left side area of upper filth receiving surface F1, F2 Mainstream H Lateral turning Flow L Reservoir water level R Radius of curvature on the front bottom surface of the recess V Vertical swirling flow θ Angle of tapered shape of the recess

Claims (3)

A flush toilet that cleans the toilet body with wash water supplied from the wash water supply source and discharges filth.
A bowl with a filth receiving surface and
The rim part formed on the upper edge of this bowl part and the rim water passage formed inside,
One rim water discharge portion formed on the front side of this rim portion, which discharges the wash water supplied from the wash water supply source forward and forms a swirling flow swirling on the dirt receiving surface.
The shelf part where the washing water discharged from this rim water discharge part flows over it,
It has a drain trap pipeline, whose entrance is connected to the lower part of the bowl portion and discharges filth.
The filth receiving surface of the bowl portion includes an upper filth receiving surface and a recess formed between the upper filth receiving surface and the drain trap pipeline.
The upper dirt receiving surface is formed by convex surfaces on both sides thereof along the lateral direction, and the front and rear regions thereof are formed by convex surfaces or concave surfaces having a curvature smaller than that on both sides regions along the front-rear direction. , Its surface shape is inclined downwards ,
The shelf portion is formed at least in front of the center of the recess in the front-rear direction, and behind the center of the recess in the front-rear direction, there is a region in which the shelf portion is not formed.
In a plan view, the concave portion has a tapered shape in which the left and right side surfaces taper toward the center in the front-rear direction of the concave portion or from the rear side to the front of the center, and the tapered shape formed by the left and right side surfaces. The angle of the water-washing toilet is smaller than the angle formed by the left and right side surfaces of the recess and the rear surface behind the side surface. 2.
The shelf portion is a first shelf portion formed on the downstream side of the rim water discharge portion, and a second shelf portion located inside the first shelf portion and at a position lower than the first shelf portion. The first shelf extends from the rim spout to the front area on the right side of the bowl, and the second shelf extends behind the left and right sides of the second shelf. The water-washing toilet according to claim 1, wherein the end extends to a region behind the center of the recess in the anteroposterior direction and in front of the rear end of the filth receiving surface.

In the second shelf portion, the joint portion with the first shelf portion is vertical due to a step, and the joint portion between the second shelf portion and the upper filth receiving surface is the first shelf portion. The water-washing stool according to claim 2, wherein the portion and the second shelf portion are smoothly joined as compared with the joint portion.

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