JP2021036128A - Water closet - Google Patents

Abstract

To provide a water closet capable of enhancing discharge efficiency of a dirt, by efficiently agitating wash water including the dirt.SOLUTION: A water closet 1 of the present invention comprises: a bowl part 12 having a dirt receiving surface 20; a rim part 18 formed on the upper edge of this bowl part and forming a water communication passage 26 on the inside; one rim water discharge port 28 for forming a swirling flow of swirling on the dirt receiving surface by discharging the wash water forward; and a drain trap pipeline 14 for discharging the dirt. The dirt receiving surface of the bowl part comprises: an upper dirt receiving surface 20; and a recessed part 22 formed between this upper dirt receiving surface and the drain trap pipeline, and in the upper dirt receiving surface, its both side areas C and D are formed of a convex surface along the lateral direction, and its front area A and a rear area B are formed of a convex surface or a concave surface with a smaller curvature than those of both side areas along the longitudinal direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a flush toilet, and more particularly to a flush toilet such as a flush toilet that cleans the toilet body with wash water supplied from a flush 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 a problem of getting worse. Further, since the two rim spouts are provided, the washing water containing the filth accumulated in the water reservoir of the recess can be effectively agitated, but the 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. This causes 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 wash water supplied from a 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 spouting part and a drain trap pipeline whose inlet is connected below the bowl part to discharge sewage, and the sewage receiving surface of the bowl part is an upper sewage receiving surface and this upper sewage receiving surface. The upper filth receiving surface is provided with a recess formed between the surface and the drain trap pipeline, and both side regions thereof are formed by convex surfaces along the lateral direction, and the front region and the rear region thereof are formed in the front-rear direction. It is characterized in that it is formed by a convex surface or a concave surface having a curvature smaller than that of both sides along the region.
In a flush toilet having such a configuration, 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 region and the rear region thereof are formed along the front-rear direction. Since it is formed by convex or concave surfaces with a curvature smaller than the bilateral region, even when washing water is discharged from one rim water discharge portion, the mainstream flows into the concave portion from the front and the rear of the concave portion of the bowl portion, respectively. 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 cleaning water containing filth can be efficiently agitated in the recess of the bowl portion by the cleaning water discharged from one rim water discharge portion, and the filth discharge efficiency can be improved.

In the present invention, preferably, the front region of the upper filth receiving surface of the bowl portion is formed by a concave surface, and the rear region is formed by a convex surface having a curvature smaller than that of both side regions.
According to the present invention configured as described above, the front region of the upper filth receiving surface of the bowl portion is formed by the concave surface, and the rear region is formed by the convex surface having a curvature smaller than that of both side regions. The mainstream of the washing water flowing in from the front can be formed to be larger, and the pushing force into the drain trap pipeline can be increased, whereby the filth discharge efficiency can be further improved.

In the present invention, preferably, among the lateral regions of the upper filth receiving surface of the bowl portion, the lateral region on the upstream side in the swirling direction of the washing water is formed by a convex surface larger than the lateral region on the downstream side.
According to the present invention configured as described above, of the lateral regions of the upper filth receiving surface of the bowl portion, the lateral region on the upstream side in the swirling direction of the washing water is a convex surface larger than the lateral region on the downstream side. Since it is formed by, the main flow of the washing water flowing in from the front of the recess can be formed to be larger, so that the pushing force into the drain trap pipeline can be increased, and thus the filth discharge efficiency can be increased. Can be further enhanced.

In the present invention, the rim water discharge portion is preferably provided on the front side of the rim portion.
According to the present invention configured in this way, the washing water discharged from the rim water discharge portion swirls about once and then flows into the recess from the front to form a main stream. The entire area can be cleaned, and the cleaning performance is improved. In other words, the washing water discharged from the rim spouting part swirls too much and the mainstream momentum weakens, or it becomes the mainstream before it swirls too much and flows into the recess, so the flow rate of the swirling washing water decreases and the flow rate rises upward. It is possible to solve the problem that the cleaning performance of the filth receiving surface is deteriorated.

The present invention preferably further has a shelf portion through which the washing water discharged from the rim water discharge portion flows, and this shelf portion is rearward from the center of the recess in the front-rear direction from the rim water discharge portion and receives upper filth. A shelf portion is formed from the rear end of the shelf portion to the rear end of the upper filth receiving surface, and the region is formed from the rear end of the surface to the front end.
In the present invention configured as described above, the 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, the rear end of the shelf portion. Since no shelf is formed in the area from to the rear end of the upper filth receiving surface, a large mainstream of washing water flowing in from the rear of the recess can be formed, so that the recess can be swiveled laterally (horizontally). Can be strengthened, thereby increasing the efficiency of discharging filth in the recess.

According to the flush toilet 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 as seen along the line III-III of FIG. It is a perspective view which looked at the flush toilet of FIG. 2 from the rear diagonally above. It is a perspective view which looked at the flush toilet of FIG. 2 from the side 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 as seen along the line VII-VII of FIG. It is a front sectional view of the flush toilet as 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 flush 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 flush toilet according to the embodiment of this invention.

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

The flush toilet 1 includes a toilet body 2, and the toilet 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 to wash the toilet bowl main body 2. 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 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 a side sectional view of FIG. It is a perspective view of the flush toilet seen from diagonally above rearward, and FIG. 5 is a perspective view of the flush toilet of FIG. 2 viewed from above sideways. 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 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 sewage receiving surface 16 of the bowl portion 12 is provided with a bowl-shaped upper sewage receiving surface 20 and a recess 22 formed between the upper sewage receiving surface 20 and the drain trap pipeline 14.

The drain trap pipe line 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 described above (FIG. 1). See). The pooled water level L of the flush toilet 1 is equal to the height of the highest point 14b of the drain trap pipe 14.

Further, a water passage chamber 24 is formed in the rear part 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 water discharge port 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 water discharge port 28, and the washing water is rimmed. It is designed to be supplied to the spout 28. Washing water is discharged from the rim spout 28 toward the front to form a swirling flow in the bowl portion 12.

Next, the shelf portion of the flush toilet 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 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 filth 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 filth 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 left-right 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. The upstream side in 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 filth 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 sewage receiving surface 20 of the sewage 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 filth 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 waste 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 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 a 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-view view showing the flow of flush water in the flush toilet according to the embodiment of the present invention, and FIG. 11 is the flow of flush 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 30, then flows down to the second shelf 32, flows on the second shelf 32, and flows on the second shelf 32, and flows on the second shelf 32. A swirling flow is formed 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 spout 28 flows on the second shelf 32, but the shelf is not formed in the rear end region of the upper filth receiving surface 20 and has a curved shape. , A part of the washing water becomes the mainstream F2 that flows into the recess 22 from diagonally behind.

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 mainstream F1 generates a push-in flow into the drain trap pipeline 14.
On the other hand, the main stream F2 flowing into the recess 22 from diagonally rearward flows in a substantially horizontal direction along the side wall of the recess 22 to form a lateral swirling flow H.

As described above, in the flush toilet 1 according to the present embodiment, filth is generated by the vertical swirling flow V and the horizontal swirling flow H formed in the recess 22 without providing the jet spout as in the conventional flush toilet. 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 1 according to the present embodiment will be specifically described. First, in the flush toilet 1 according to the present embodiment, the upper sewage receiving surface 20 of the sewage receiving surface 16 of the bowl portion 12 has a right side region C and a left side region D formed by convex surfaces 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 stream 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 stream F2 of the washing water flowing in from the rear of the recess 22 is in the lateral direction ( A swirling flow H in the horizontal direction) is generated. As a result, according to the flush toilet 1 according to the present embodiment, the flush water spouted from the rim spout 28 can efficiently stir the flush water containing filth in the recess 22 of the bowl portion 12, and the filth discharge efficiency. Can be enhanced.

Next, in the flush toilet 1 according to the present embodiment, the front region A of the upper waste 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 toilet 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. Since the mainstream F1 of the washing water flowing in from the front of the recess 22 can be formed larger, the pushing force into the drain trap pipeline 14 can be increased, thereby increasing the pushing force into the drain trap line 14. , The efficiency of waste discharge can be further improved.

Next, in the flush urinal 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 item 28 has swirled about once, it is followed. 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 cleaned with more cleaning water, and the cleaning performance is improved.

Next, in the flush toilet 1 according to the present embodiment, the area where the second shelf 32 is behind the center 22a of the recess 22 in the front-rear direction from the rim spout 28 and in front of the rear end 20a of the upper filth receiving surface 20. Since no shelf is formed in the region from the rear end of the second shelf 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. The cleaning water containing filth can be swirled more effectively in the recess 22. As a result, according to the flush toilet 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 immediately downstream of the rim spout 28 and the first shelf portion inside and inside the first shelf portion 30. 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 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 flush toilet bowl 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 rim spout 28 Since the discharged wash water flows on the first shelf 30 and then flows out on the second shelf 32, the wash water swirled once on the second shelf 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 waste discharge efficiency can be further improved.

Next, in the water-washing 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 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. It can be more efficient.

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 waste 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 vertically 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 waste discharge.

Next, in the flush toilet 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 pipe line 14, thereby increasing the filth discharge efficiency.

Next, in the flush toilet 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 washing water flowing into the recess 22 can be smoothly swirled. The vertical swirling flow V can be effectively formed, thereby increasing the efficiency of discharging filth.

Next, in the flush toilet 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 swirling flow V can be formed, whereby the efficiency of discharging filth can be improved.

Next, in the flush toilet 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 main walls 34, can effectively form a vertical swirling flow.

Next, in the flush toilet 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 washing water flowing into the recess 22 can be swirled more smoothly. The vertical swirling flow V can be effectively formed, thereby increasing the efficiency of discharging filth.

1 Flush toilet 2 Toilet bowl body 6 Water storage tank 12 Bowl part 14 Drain trap pipeline 16 Waste receiving surface 18 Rim part 20 Upper waste receiving surface 22 Recessed 26 Rim water passage 28 Rim water 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 level R Radius of curvature of the front bottom surface of the recess V Vertical swirling flow θ Angle of the tapered shape of the recess

In order to achieve the above object, the present invention is a flush toilet that cleans the toilet 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 washing water discharged from the 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. is formed by a convex surface along the direction, the convex Menmata of curvature smaller than the both sides region its forward region and the rear region along the longitudinal direction are formed by concave recesses in plan view, the side of the left and right recesses It has a tapered shape that tapers from the center in the front-rear 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 side surfaces is the left and right side surfaces in the recess and the rear rear surface of this side surface. It is characterized by being smaller than the angle formed by the toilet.
In a flush toilet having such a configuration, 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 region and the rear region thereof are formed along the front-rear direction. Since it is formed by convex or concave surfaces with a curvature smaller than the bilateral region, even when washing water is discharged from one rim water discharge portion, the mainstream flows into the concave portion from the front and the rear of the concave portion of the bowl portion, respectively. 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 cleaning water containing filth can be efficiently agitated in the recess of the bowl portion by the cleaning 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 surface behind the 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 at a position inside the first shelf portion formed on the downstream side of the rim water discharge portion and 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 rearward from the center of the recess in the front-rear direction and from the rear end of the upper filth receiving surface to the front. No second shelf is formed in the region 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 discharges water from the rim. A region is formed from the portion to the rear of the center of the recess in the front-rear direction and from the rear end of the upper filth receiving surface to the front, and further, the region from the rear end of the second shelf portion to the rear end of the upper filth receiving surface is a shelf. Since the portion is not formed, the main flow of the washing water flowing in from the rear of the recess can be formed to be large, so that the lateral (horizontal) swirl of the recess can be strengthened, whereby the inside of the recess can be strengthened. The efficiency of filth discharge can be increased .

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 and the second shelf are separated from each other by the step between the first shelf and the second shelf. 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 and flow down at once before flowing down from the upper filth receiving surface into the recess. 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 waste discharge efficiency can be improved.

Claims (5)

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 unit that discharges the wash water supplied from the wash water supply source forward and forms a swirling flow that swirls on the filth receiving surface.
It has a drain trap pipeline, whose entrance is connected below 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 filth receiving surface is formed by convex or concave surfaces having a curvature smaller than that of the bilateral regions along the front-rear direction of the front region and the rear region of the upper filth receiving surface. A flush toilet that features that. The flush toilet according to claim 1, wherein the front region of the upper filth receiving surface of the bowl portion is formed by a concave surface, and the rear region is formed by a convex surface having a curvature smaller than that of both side regions. The water washing according to claim 2, wherein the lateral region on the upstream side in the swirling direction of the washing water is formed by a convex surface larger than the lateral region on the downstream side among the lateral regions of the upper filth receiving surface of the bowl portion. toilet bowl. The flush toilet according to any one of claims 1 to 3, wherein the rim water discharge portion is provided on the front side of the rim portion. Further, it has a shelf portion through which the washing water discharged from the rim water discharge portion flows, and this shelf portion is behind the center of the recess in the front-rear direction from the rim water discharge portion and after the upper filth receiving surface. The flush toilet according to claim 4, wherein the area from the rear end of the shelf to the rear end of the upper filth receiving surface is formed up to the area in front of the end, and the shelf is not formed.

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