JP2024019622A - Flush toilet bowl - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flush toilet bowl capable of forming a more powerful push-in flow directed from the front of a pot part to the bottom side and improving waste discharge performance.

SOLUTION: A flush toilet bowl 1 comprises: a bowl part 6 including a waste receiving face 16 being bowl-shaped, a rim part 18 formed above the waste receiving face, and a pot part 20 formed below the waste receiving face and keeping stored water; and a discharge trap pipeline 12 connected to a bottom part of the pot part 20. The waste receiving face 16 includes a recess 26 recessed downward from the front of the waste receiving face to the side part of the pot part 20. The pot part 20 includes a side wall 30 rising in a vertical direction on the lateral side, a front wall 32 rising in the vertical direction on the front side, and an inclined part 38 inclined so that the height of the upper edge part of the side wall is lowered toward the front, the inclined part 38 extending from the vicinity of the rear end of the recess 26 to the front.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a flush toilet, and particularly to a flush toilet that is flushed with flush water supplied from a flush water source and discharges waste.

Conventionally, for example, as described in Patent Document 1, cleaning water spouted from a first rim spout flows down from the diagonally forward side of the bowl portion toward the entrance of the drain pipe, and flows into the second rim spout. The vertical swirling flow of the cleaning water that is discharged from the water outlet and sneaks into the recess below the dirt receiving surface from the rear side, and the vertical swirling flow of the cleaning water that sneaks into the recess from the side side are combined. 2. Description of the Related Art Flush toilets that sink floating waste into standing water are known.

Further, for example, as described in Patent Document 2, the cleaning water spouted from the first spout and the second spout of the rim flows from the left side into the pot below the dirt receiving surface, and also flows into the pot from the left side. 2. Description of the Related Art Flush toilets are known that wash a wide range of dirt receiving surfaces by flushing from the front side.

Furthermore, for example, as described in Patent Document 3, the cleaning water spouted from the first water spouting part of the rim generates a first branch flow in front of the dirt receiving surface, and this first branch flow is formed on the dirt receiving surface. A main flow is formed that flows down from the main stream toward the reservoir side. In addition, the wash water discharged from the second water discharge section flows down into the water reservoir section from the right vertical wall surface of the water reservoir section, and forms a vertical swirling flow within the water reservoir section. A flush toilet is known in which a induced flow, which is a combination of these two flows, pushes waste into the toilet drainage channel.

JP2015-196960A JP2020-51048A JP2019-190217A

In order to suppress the adhesion of filth to the bowl of the flush toilets of Patent Documents 1 to 3 mentioned above, it has been considered to further enlarge the water reservoir of the bowl. However, in such flush toilets, the amount of flushing water that flows down into the pot without swirling around the bowl surface increases, and for example, in the latter half of cleaning, the amount of flushing water that swirls around the bowl surface decreases, resulting in a flow that sinks waste into the pooled water. As a result, filth, especially floating filth, is difficult to be discharged, resulting in a problem that filth remains in the pot.

On the other hand, even if you simply try to strengthen the swirling flow to create a stronger flow that sinks waste into the pooled water, in a conventional flush toilet, multiple flows trying to flow into the urn collide with each other. As a result, a problem arose in that filth, especially floating filth, was difficult to be discharged.

Therefore, the present invention was made in order to solve the problems and problems of the prior art, and it is possible to form a stronger pushing flow from the front of the jar toward the bottom, thereby improving waste discharge performance. The purpose is to provide flush toilets.

In order to achieve the above-mentioned object, the present invention provides a flush toilet that is flushed with flush water supplied from a flush water source and discharges filth. a bowl portion including a rim portion formed on the rim portion, a pot portion formed below the filth receiving surface for storing accumulated water, and a drain trap conduit connected to the bottom of the pot portion. The filth-receiving surface includes a recess that is recessed downward from the front part of the filth-receiving surface to a side part of the jar part, and the jar part has a side wall vertically rising on the lateral side and a front part of the urn part. a front wall that stands up vertically on the side; and an inclined part that is inclined so that the height of the upper edge of the side wall becomes lower toward the front, the inclined part being near the rear end of the recessed part. It is characterized by extending from the front towards the front.
In one embodiment of the present invention configured in this way, the bowl part is provided with an inclined part that is inclined so that the height of the upper edge of the side wall becomes lower toward the front. The flow flowing from the rear to the front side descends to the inside of the pot due to the slope inside the recess, forming a forward flow toward the front wall of the pot, and the descending forward flow hits the front wall. This creates a vertically swirling flow that rises along the front wall. The filth receiving surface is provided with a concave portion recessed downward from the front portion of the filth receiving surface to the side portion of the bowl portion, so that the flow flowing from the rear of the bowl portion toward the front side is directed to the outside of the sloping portion. Washing water is guided forward from the container and directed forward along the recess, forming a flow that flows backward from the recess at the front of the dirt receiving surface toward the pot. At this time, the inclined portion extends forward from near the rear end of the recess and from inside, so that the flow of wash water that has flowed into the recess flows along the recess. As a result, the cleaning water flows down from the side parts of the jar to the inside of the jar, and collides with the forward flow on the slope and the rear flow from the concave part of the front part of the dirt receiving surface toward the jar. This can prevent disturbance of these flows. Therefore, according to such a configuration, the vertically swirling flow rising along the front wall and the backward flow flowing from the recess toward the pot are easily formed without interfering with each other, and the flow along the front wall A stronger pushing flow from the front of the jar toward the bottom, which is formed by the merging of the upward vertical swirling flow and the backward flow from the recess toward the jar, improves waste discharge performance. can be done.

In the present invention, preferably, the lowermost part of the recessed part of the dirt receiving surface is located below the uppermost part of the inclined part of the pot part.
In one embodiment of the present invention configured in this way, the lowest part of the concave portion of the dirt receiving surface is arranged below the highest part of the sloped part of the pot part. As a result, the height of the forward flow that flows downward toward the front wall of the jar while descending inside the jar due to the slope, and the rearward flow that flows backward from the recess toward the jar tend to be different in height. , it is possible to suppress the collision between the forward flow from the inclined part and the backward flow from the recessed part, and a stronger pushing flow from the front to the bottom of the pot formed by their merging is formed. It's easy to do.

In the present invention, preferably, the pot further includes a guide portion in which the upper edge of the side wall has a constant height behind the rear end of the recess.
In one embodiment of the present invention configured in this manner, the pot further includes a guide portion in which the upper edge of the side wall has a constant height behind the rear end of the recess. Equipped with As a result, the flow flowing from the rear of the bowl part toward the front side can be rectified by the guiding part behind the rear end of the recessed part, and the flow can be rectified forward from the inclined part. The directional flow can be made less turbulent, and the pushing flow from the front to the bottom of the pot, which is formed by the merging of the forward flow from the inclined part and the backward flow from the recessed part, can be formed even more powerfully.

In the present invention, preferably, the top of the inclined portion of the upper edge of the pot is formed on the front side of the rear wall of the pot.
In one embodiment of the present invention configured in this way, the top of the sloped portion of the upper edge of the pot is formed on the front side of the rear wall of the pot on the rear side. . As a result, the flow of washing water that tends to be directed forward on the lateral side of the jar on the front side of the rear wall is caused to flow downward along the slope from the top of the slope on the upper edge of the jar. The flow can be divided into a flow guided toward the front from the outside of the slope of the upper edge of the jar, and a flow that is difficult to be disturbed when the flow is separated on the side of the jar. This makes it difficult to disrupt the forward flow that flows toward the front wall of the jar while descending inside the jar due to the sloped portion, and the rearward flow that flows rearward from the recess toward the jar. According to such a configuration, when the vertically swirling flow rising along the front wall and the backward flow heading from the recess toward the pot unite, the flow is prevented from colliding with each other, and the flow is prevented from colliding with the flow moving upward along the front wall. It is possible to form a more powerful pushing flow toward the bottom.

In the present invention, preferably, the recessed portion is formed in an inverted fan shape that widens from the front portion of the dirt receiving surface toward the rear side in plan view.
In one embodiment of the present invention configured in this manner, the recessed portion is formed in an inverted fan shape that widens from the front portion of the dirt receiving surface toward the rear side in plan view. As a result, when the swirling flow of the washing water is relatively strong during the first half of cleaning, etc. and the swirling flow flows relatively forward of the concave portion of the dirt receiving surface, it is possible to suppress the washing water from collecting in the concave portion, and during the second half of cleaning, etc. When the momentum of the swirling flow of the washing water becomes relatively weak and the swirling flow flows relatively backward of the concave part of the dirt receiving surface, the washing water can be collected more easily in the concave part, and the water flows from the concave part on the front side of the dirt receiving surface to the reservoir part. It is possible to easily form a forced flow of waste flowing down towards the area. Therefore, it is possible to form a stronger pushing flow from the front of the jar toward the bottom.

In the present invention, preferably, the maximum width of the recess is smaller than the maximum width of the pot in plan view.
In one embodiment of the present invention configured in this manner, the maximum width of the recessed portion is smaller than the maximum width of the pot portion in plan view. Therefore, the forward flow on the sides of the jar can easily form a forward flow toward the front wall of the jar while descending inside the jar due to the slope, and the cleaning water can flow directly forward. By making it easier to flow in this direction, the backward flow flowing backward from the concave part toward the pot can be suppressed from becoming too large and colliding with the forward flow from the slope, and these are combined to form a A more powerful pushing flow can be created from the front of the jar toward the bottom.

According to the flush toilet of the present invention, it is possible to form a stronger pushing flow from the front of the urn toward the bottom, thereby improving waste discharge performance.

FIG. 1 is a perspective view showing a flush toilet according to an embodiment of the present invention. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 2 is a sectional view taken along line III-III in FIG. 1. FIG. 3 is a sectional view taken along line IV-IV in FIG. 2. FIG. 4 is a sectional view taken along line VV in FIG. 3. FIG. 4 is a cross-sectional view taken along line VI-VI in FIG. 3. FIG. 4 is a cross-sectional view taken along line VII-VII in FIG. 3. FIG. 4 is a cross-sectional view taken along line VIII-VIII in FIG. 3. FIG. 4 is a sectional view taken along line IX-IX in FIG. 3. FIG. 4 is a sectional view taken along line XX in FIG. 3. FIG. 4 is a sectional view taken along the line XI-XI in FIG. 3. FIG. 4 is a sectional view taken along line XII-XII in FIG. 3. FIG. 4 is a sectional view taken along line XIII-XIII in FIG. 3. FIG.

Next, a flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
1 is a perspective view showing a flush toilet according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV--IV in FIG. 2. FIG.

As shown in FIGS. 1 to 3, the flush toilet 1 is a flush toilet that is flushed with flush water supplied from a flush water source and discharges waste. The flushing toilet bowl 1 is a flushing type toilet bowl that flushes away waste by the action of water caused by the head of water within the bowl. The flush toilet 1 includes a toilet main body 2 and a water storage tank 4 that stores flush water for washing the toilet main body 2. The toilet bowl main body 2 is made of ceramic. The toilet main body 2 includes a bowl portion 6 on the front side. Further, a common water passage 8 whose upstream end communicates with the water storage tank 4 is formed at the rear upper part of the bowl part 6, and a drainage pipe 10 for discharging waste is formed at the rear lower part of the bowl part 6. has been done. Note that the flush toilet 1 may be a so-called siphon-type flush toilet that uses siphon action to suck in the waste in the bowl portion 6 and discharge it to the outside from the drain trap conduit 12 all at once. In addition, in the following description of an embodiment of the present invention, as seen from the side of the user using the flush toilet 1 (the side of the user standing in front of the flush toilet 1 to use the flush toilet 1). The front side is referred to as the front side, the back side as viewed from the user is referred to as the rear side, the right side as viewed from the front of the flush toilet 1 is referred to as the right side, and the left side as viewed from the front is referred to as the left side.

A drain trap conduit 12 is connected below the bowl portion 6. The drain trap pipe line 12 includes an inlet pipe line 12a connected to the bottom of the pot part (to be described later) of the bowl part 6, a rising pipe line 12b extending diagonally backward and upward from the inlet pipe line 12a, and a rising pipe line 12b descending from the rising pipe line 12b. A descending pipe line 12c is provided. The bowl portion 6 and the drain trap conduit 12 are made of ceramic and are integrally molded with the toilet bowl body 2. The bowl portion 6 forms an egg shape with a vertical width of 32 cm to 40 cm in the front-rear direction and a horizontal width of 22 cm to 30 cm in the left-right direction when viewed from above.

The water storage tank 4 mentioned above is a source of water for washing, and a drain valve 14 is provided in the water storage tank 4, and is opened and closed by an operation lever (not shown). Note that the flush toilet 1 may be supplied with flush water not by the water storage tank 4 but by a pump or the like.

The bowl part 6 includes a bowl-shaped dirt receiving surface 16, a rim part 18 formed above the dirt receiving surface 16, and a pot part 20 formed below the dirt receiving surface 16 to store water. ing. Here, the inner circumferential surface 18a of the rim portion 18 has a shape that overhangs inward, as shown in FIG. There is. The pot part 20 forms a substantially triangular shape that is closer to an oval shape (an elliptical shape with a tapered front side) than the substantially triangular water reservoir surface W0, and has a vertical width of 20 cm to 24 cm in the front-rear direction when viewed from above, and a horizontal width of 20 cm to 24 cm in the left-right direction. is formed to a size of 15 cm to 19 cm. Here, the reservoir surface W0 of the urn part 20 is approximately triangular, and has a vertical width of 160 mm to 180 mm in the front-rear direction and a width of 125 mm to 145 mm in the left-right direction when viewed from above, which is similar to the reservoir of a conventional flush-type flush toilet. It is formed larger (enlarged) than the water surface.

A first water spout 22, which is a water spout for spouting cleaning water, is formed on the front side of the center portion of the inner circumferential surface of the rim portion 18 of the bowl portion 6, which is bisected in the front-rear direction on the left side when viewed from the front. A second water spout 24, which is a water spout portion for spouting cleaning water, is formed on the rear side of the center portion on the right side when viewed from the front. These first water spout 22 and second water spout 24 form a swirling flow that swirls in the same direction (counterclockwise in FIG. 1). The common water passage 8 formed at the rear upper part of the flush toilet bowl 1 described above is branched to the left and right after heading toward the front of the toilet, and is configured to supply flush water to the first spout 22 or the second spout 24. It has become. Note that the number of water spouts for spouting cleaning water may be one or three or more. Moreover, by directing water spouts such as the first water spout 22 and the second water spout 24 in opposite directions, a swirling flow in a clockwise swirling direction may be formed in the bowl portion.

Next, as shown in FIGS. 1 to 13, etc., the dirt receiving surface 16 will be explained.
The dirt receiving surface 16 includes a recess 26 that is depressed downward from the front part of the dirt receiving surface 16 to the side part of the pot part 20. As shown in FIG. 4, the concave portion 26 is formed in an inverted fan shape that widens from the front portion of the dirt receiving surface 16 toward the rear side in plan view. The concave portion 26 is a concave portion of the dirt receiving surface 16 that is deeper than the surrounding surface of the concave portion 26 (for example, if the curved surface is formed to match the surrounding shape, the curved surface that originally protrudes convexly). Some parts are intentionally flat, and others have relatively flat surfaces that are concave downwards. The recess 26 forms a cleaning water guiding portion that is slightly lower than the surrounding dirt receiving surface from the rear end 26a to the front part of the dirt receiving surface. Further, the rear end portion 26a of the recess 26 is relatively smoothly connected to the surrounding dirt receiving surface 16. The rear end portion 26a is located forward of the portion of the side wall 30 where the width in the left-right direction between the left and right side walls 30 of the pot portion 20 is maximum. Further, the rear end portion 26a is located on the rear side of the front wall 32 of the pot portion 20 in a top view, and is located in a middle region A2 to be described later.

Since the inflection portion of the curved surface of the recess 26 is difficult to represent on a drawing, the region of the recess 26 is hypothetically shown in FIG. 4 as the region inside the dashed line. In the cross section shown in FIG. 5, the recess 26 is formed in the region B1 of the dirt receiving surface 16. The outer ends 26b of the recess 26 (both ends of the region B1) form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. The bottom 26c of the recess 26 in the region B1 is formed relatively shallow.

In the cross section shown in FIG. 6, the recess 26 is formed in the region B2 of the dirt receiving surface 16. The outer ends 26b of the recess 26 (both ends of the region B2) form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. The width between the outer ends 26b in region B2 is larger than the width between the outer ends 26b in region B1. The bottom 26c of the recess 26 in region B2 is formed relatively deep. The height (depth) between the outer end 26b and the bottom 26c in the region B2 is larger (deeper) than the height (depth) between the outer end 26b and the bottom 26c in the region B1. The radius of curvature of the bottom portion 26c shown in FIG. 6 is larger than the radius of curvature of the bottom portion 26c shown in FIG.

In the cross section shown in FIG. 7, the recess 26 is formed in the region B3 of the dirt receiving surface 16. The outer ends 26b of the recess 26 (both ends of the region B3) form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. The width between the outer ends 26b in region B3 is larger than the width between the outer ends 26b in region B2. The height (depth) between the outer end 26b and the bottom 26c in the region B3 is larger (deeper) than the height (depth) between the outer end 26b and the bottom 26c in the region B2. The radius of curvature of the bottom portion 26c shown in FIG. 7 is larger than the radius of curvature of the bottom portion 26c shown in FIG.

In the cross section shown in FIG. 8, the recess 26 is formed in the region B4 of the dirt receiving surface 16. The outer ends 26b of the recess 26 (both ends of the region B4) form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. The width between the outer ends 26b in region B3 is larger than the width between the outer ends 26b in region B3. The height (depth) between the outer end 26b and the bottom 26c in the region B4 is larger (deeper) than the height (depth) between the outer end 26b and the bottom 26c in the region B3. The radius of curvature of the bottom portion 26c shown in FIG. 8 is larger than the radius of curvature of the bottom portion 26c shown in FIG.

In the cross section shown in FIG. 9, the recess 26 is formed in the region B5 of the dirt receiving surface 16. The outer ends 26b of the recess 26 (both ends of the region B5) form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. The width between the outer ends 26b in region B5 is larger than the width between the outer ends 26b in region B4. The height (depth) between the outer end 26b and the bottom 26c in the region B5 is larger (deeper) than the height (depth) between the outer end 26b and the bottom 26c in the region B4. In the cross-sectional position shown in FIG. 9, the bottom portion 26c is the lowest portion 26e at the lowest position of the recess 26. The lowermost part 26e of the recess 26 is located below the uppermost part 38a of the inclined part 38 of the pot part 20, which will be described later. The radius of curvature of the bottom portion 26c shown in FIG. 9 is larger than the radius of curvature of the bottom portion 26c shown in FIG.

In the cross section shown in FIG. 10, the recess 26 is formed in the region B6 of the dirt receiving surface 16. At this cross-sectional position, an inclined portion 38 of the upper edge 36 of the side wall 30 is formed inside the recess 26 . The recessed portion 26 is recessed so as to flatten a part of the convexly protruding curved surface (the curved surface connecting the dirt receiving surface 16 and the inclined portion 38). The outer ends 26b (both ends of region B6) of the recess 26 form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. An inner end 26d (inner end of region B6) of the recess 26 forms an inflection point where the surface changes further downward from the recess 26 toward the slope 38. The width between the left and right outer ends 26b on the outside of the recess 26 is larger than the width between the left and right outer ends 26b in region B5 as shown in FIG.

In the cross section shown in FIG. 11, the recess 26 is formed in the region B7 of the dirt receiving surface 16. A sloped portion 38 is formed inside the recessed portion 26 . The recessed portion 26 is recessed so as to flatten a part of the curved surface that protrudes convexly. The outer ends 26b (both ends of region B7) of the recess 26 form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. An inner end 26d (inner end of region B7) of the recess 26 forms an inflection point where the surface changes further downward from the recess 26 toward the slope 38. The width between the outer end 26b and the inner end 26d in each region B7 is smaller than the width between the outer end 26b and the inner end 26d in each region B6. The width between the left and right outer ends 26b on the outside of the recess 26 is larger than the width from the outer end 26b of the right region B6 to the outer end 26b of the left region B6 as shown in FIG. ing.

In the cross section shown in FIG. 12, the recess 26 is formed in the region B8 of the dirt receiving surface 16. A sloped portion 38 is formed inside the recessed portion 26 . The recessed portion 26 is recessed so as to flatten a part of the curved surface that protrudes convexly. The outer ends 26b (both ends of region B8) of the recess 26 form an inflection point where the surface changes downward with respect to the surrounding dirt receiving surface 16. An inner end 26d (inner end of region B8) of the recess 26 forms an inflection point where the surface changes further downward from the recess 26 toward the slope 38. The width between the outer end 26b and the inner end 26d in each region B8 is smaller than the width between the outer end 26b and the inner end 26d in each region B7. The width between the left and right outer ends 26b on the outside of the recess 26 is larger than the width from the outer end 26b of the right region B7 to the outer end 26b of the left region B7 as shown in FIG. ing. The width between the outer ends 26b on both sides of the region B8 is defined as the maximum width W1 of the recess 26. As shown in FIG. 4, the maximum width W1 of the recess 26 is smaller than the maximum width W2 of the pot 20 in plan view. In the portion forming the maximum width W2 of the pot portion 20, a guide portion 40 is formed on the upper edge portion 36, and a recess portion 26 is not formed. Therefore, the swirling flow that swirls from the rear side to the front side is easily guided from the guide portion 40 to the slope portion 38 side in the portion of the pot portion 20 forming the maximum width.

In the cross section shown in FIG. 13, the recess 26 is not formed, and the guide portion 40 of the upper edge 36 is formed on the dirt receiving surface 16.

Next, the pot portion 20 will be explained in detail with reference to FIGS. 1 to 4.
A water reservoir 28 is formed within the pot 20 and has a water reservoir surface W0 indicated by a dashed line. The pot part 20 has a side wall 30 that stands up vertically on the side, a front wall 32 that stands up vertically on the front side, a rear wall 34 that stands up vertically on the rear side, and a height of an upper edge 36 of the side wall 30. The slope part 38 inclines the upper edge part 36 of the side wall 30 so that the height becomes lower toward the front, and the height of the upper edge part 36 of the side wall 30 is constant behind the rear end part 26a of the recessed part 26. A guiding section 40 is provided.

The front wall 32 is formed to rise from the bottom 33 of the pot 20. Note that the angle of the front bottom corner 41 between the front wall 32 and the bottom 33 is smaller than the angle of the rear bottom corner 42 between the rear wall 34 and the bottom 33. This makes it easier for the washing water flowing down from the inclined portion 38 to form a vertical swirl along the front wall 32 after it once flows into the water from the reservoir surface. Further, the vertically swirling flow at this time is a flow rising from the bottom part 33 to the front wall 32 along the front bottom corner part 41, and becomes a relatively compact vertically swirling flow to the upper part of the front wall 32. Further, the angle of the front bottom corner portion 41 is relatively small, and when the flow toward the front side hits the front bottom corner portion 41 from the bottom portion, it is easy to form a vertical turn upward along the front wall 32. Although it is possible to form a vertical swirling flow even if the flow toward the front side does not hit the bottom, the vertical swirling flow can be formed more efficiently by rising along the front bottom corner portion 41 after hitting the bottom.

As shown in FIG. 2, the inclined portion 38 extends forward from near and inside the rear end portion 26a of the recessed portion 26. As shown in FIG. The inclined portion 38 is also shown in FIGS. 2 to 4 because the inflection portion of the curved surface is difficult to represent on the drawings. The region of the inclined portion 38 is hypothetically shown as the region inside the broken line. The slope portion 38 extends forward from a region on the side of the middle region A2 of three regions (front region A1, middle region A2, and rear region A3) obtained by dividing the pot portion 20 into three in the front-rear direction. Note that the rear end portion 26a of the recessed portion 26 is also located in a region on the lateral side of the middle region A2. Further, as shown in FIGS. 11 and 12, the inclined portion 38 forms a curved corner portion in a longitudinal section, and a shelf-shaped flow path is formed on the upper side of the curved corner portion. The top portion 38a of the inclined portion 38 is formed on the front side of the rear wall 34 of the pot portion 20 on the rear side. The uppermost part 38a of the inclined part 38 serves as an inflection point where it bends downward from the guide part 40, and easily forms a trigger for the cleaning water to start flowing downward inward. The inclined portion 38 forms a downward inclined angle with respect to the guiding portion 40 in a range of 2 degrees to 35 degrees. The inclined portion 38 forms a surface that is inclined lower than the guiding portion 40 . The lower end of the inclined portion 38 is connected slightly below the top of the front wall 32. Once the wash water has flowed into the inclined portion 38, it is suppressed from flowing toward the outer recess 26, and is less likely to interfere with the wash water flowing above the recess 26. Therefore, the washing water flowing from the inclined part 38 to the inside of the pot part 20 and the washing water flowing on the concave part 26 to the front side of the dirt receiving surface 16 are less likely to interfere with each other, and the two flows are formed more efficiently and strongly. can.

The guide portion 40 extends substantially horizontally from the rear end of the inclined portion 38 toward the rear side to the rear wall 34 . The guide portion 40 is also shown in FIGS. 2 and 3 because the inflection portion of the curved surface is difficult to show on the drawings. The region of the guide portion 40 is virtually shown as the region inside the broken line.

Next, with reference to FIG. 4, the flow of flush water in the flush toilet according to an embodiment of the present invention will be described.
First, when a user operates an operating lever (not shown) of the water storage tank 4, the drain valve 14 opens and wash water is supplied from the water storage tank 4 to the common water passage 8. As shown by arrows F1 and F2, cleaning water is spouted from the first spout 22 and second spout 24, and as shown by arrows F3 and F4, it swirls around the pot 20 on the dirt receiving surface 16. A swirling flow is formed. At this time, in the lateral regions of the pot 20, the flow direction of the cleaning water is relatively more likely to be aligned in the forward direction compared to the front and rear regions of the pot.

At this time, as shown by an arrow F5 (see FIGS. 2 and 4), a flow flows from the rear of the bowl section to the front side of the bowl section 20 in a relatively inner side region of the pot section 20 along the guide section 40. First, the water flows toward the front side as a substantially horizontal linear flow, and then forms a flow that descends toward the inside of the pot portion 20 due to the inclined portion 38 . At this time, the flow of wash water that has once flowed into the sloped part 38 flows down along the sloped part 38 or inward from the sloped part 38, and flows into the water reservoir surface WO. In this way, the main flow of the forward flow that descends inward to the inside of the pot 20, flows into the water from the reservoir surface WO, and heads toward the front wall 32 of the pot 20, as shown by arrow F6 (Fig. 2), by hitting the front wall 32 from the bottom 33 of the pot 20, a vertically swirling flow rising along the front wall is formed. Note that by hitting the front wall 32 of the jar 20 instead of the bottom 33 of the jar 20, it is also possible to form a vertically swirling flow that rises along the front wall.

Further, as shown by arrow F7 (see FIGS. 2 and 4), the flow flowing from the rear of the bowl part to the front side of the slightly outer side area of the pot part 20 is directed from the outside of the inclined part 38 to the front. This forms a flow that is guided forward along the recess 26. At this time, the flow of washing water that once entered the recess 26 is guided forward along the recess 26 and flows down into the side slope 38 and the pot 20, causing a forward flow in the slope 38. It is possible to prevent the flow from colliding with the backward flow from the recess 26 toward the pot 20, which will be described later, and disturbing these flows.

As shown by arrow F8 (see FIGS. 2 and 4), a part of the washing water guided forward along the recess 26 is directed backward from the recess 26 at the front of the waste receiving surface 16 toward the pot 20. form a flow that flows. As shown by arrow F9 (see FIG. 4), the other part of the wash water guided forward along the recess 26 continues to swirl on the dirt receiving surface 16. At this time, since the concave portion 26 forms a portion that is more concave than the dirt receiving surface 16, it is easy to form a flow that flows backward from the concave portion 26 toward the pot portion 20.

The vertically swirling flow rising along the front wall 32 (the flow shown by arrow F6) and the backward flow heading from the recess 26 toward the pot 20 (the flow shown by arrow F8) are merged, as shown by arrow F10 ( (see FIGS. 2 and 4), it is possible to form a stronger pushing flow from the front of the pot 20 toward the bottom side. Therefore, the combined flow strengthens the pushing flow from the front of the pot 20 toward the bottom side, thereby making it possible to further improve waste discharge performance. Further, such a forced flow can improve the ability to discharge fine particulate dirt (floating dirt) or maintain the ability to discharge particulate dirt relatively high. In the front region of the pot 20, the depth from the reservoir water surface to the bottom is shallower than in the rear region, and the flow from above using the vertical swirling flow effectively pushes in floating waste. It's getting easier. The filth pushed into the water together with the wash water is discharged downstream from the drain trap pipe 12.

Furthermore, when the momentum of the swirling flow in the circumferential direction of the cleaning water is relatively strong and the swirling flow flows relatively forward of the recess 26 of the dirt receiving surface 16 (for example, during the first half of the cleaning period), the depth of the recess 26 at the position through which the swirling flow passes is increased. Since the depth is relatively shallow, it is possible to prevent the cleaning water from collecting in the recess 26, and the momentum of the swirling flow of the cleaning water is relatively weak. For example, during the latter half of the cleaning period), the relatively deep recess 26 at the position through which the cleaning water is collected can be easily collected in the recess 26. Therefore, it is possible to more easily form a pushing flow of dirt flowing down from the concave portion 26 on the front side of the dirt receiving surface 16 toward the water storage portion.

According to the above-described flush toilet 1 according to the embodiment of the present invention, the pot portion 20 includes the inclined portion 38 such that the height of the upper edge portion 36 of the side wall 30 thereof becomes lower toward the front. As a result, the flow flowing from the rear of the bowl part 6 toward the front side forms a forward flow toward the front wall 32 of the jar part 20 while descending inside the jar part 20 by the inclined part 38 inside the recessed part 26. However, the descending forward flow hits the front wall 32, forming a vertically swirling flow that rises along the front wall 32. Further, the waste receiving surface 16 includes a recess 26 that is recessed downward from the front part of the waste receiving surface 16 to the side part of the bowl part 20, so that a flow flowing from the rear to the front side of the bowl part 6 is formed. , a flow in which the washing water that is guided forward from the outside of the inclined portion 38 and guided forward along the concave portion 26 flows backward from the concave portion 26 in the front portion of the dirt receiving surface 16 toward the pot portion 20. form. At this time, the inclined portion 38 extends forward from the inner side near the rear end portion 26a of the recess 26, so that the flow of the washing water that has flowed into the recess 26 flows along the recess 26. As a result, the cleaning water flows down from the side portions of the pot 20 to the inside of the pot 20, flows forward at the inclined portion 38, and flows backward toward the pot 20 from the concave portion 26 at the front of the dirt receiving surface 16. It is possible to suppress disturbance of these flows by colliding with the flows in the same direction. According to such a configuration, a vertically swirling flow rising along the front wall 32 and a rearward flow flowing from the recess 26 toward the pot 20 are easily formed without interfering with each other, and the flow on the front wall 32 is easily formed. It is possible to form a stronger pushing flow from the front of the jar 20 toward the bottom side, which is formed by the merging of the vertically swirling flow that rises along the container and the backward flow that heads from the recess 26 toward the jar 20. It is possible to improve waste discharge performance.

Further, according to the flush toilet bowl 1 according to the present embodiment, the lowermost part 26e of the recess 26 of the waste receiving surface 16 is arranged below the uppermost part 38a of the inclined part 38 of the pot part 20. As a result, a forward flow flows toward the front wall 32 of the jar 20 while descending inside the jar 20 by the inclined portion 38, and a rearward flow flows backward from the recess 26 toward the jar 20. The heights tend to be different, and it is possible to suppress collision between the forward flow from the inclined part 38 and the backward flow from the recessed part 26, and from the front to the bottom of the pot part 20 formed by their merging. This makes it easier to form a stronger pushing flow toward the direction.

Furthermore, according to the flush toilet 1 according to the present embodiment, the pot portion 20 further includes a guide portion in which the height of the upper edge portion 36 of the side wall 30 is constant behind the rear end portion 26a of the recess portion 26. 40. Thereby, the flow flowing from the rear of the bowl portion 6 toward the front side can be guided as a flow rectified toward the front side by the guiding portion 40 at the rear of the rear end portion 26a of the recessed portion 26, and The forward flow from the part 38 is hard to be disturbed, and the forward flow from the inclined part 38 and the backward flow from the recessed part 26 are combined to form a push from the front to the bottom of the pot part 20. The flow can be made even stronger.

Further, according to the flush toilet 1 according to the present embodiment, the top 38a of the sloped portion 38 of the upper edge 36 of the pot 20 is formed on the front side of the rear wall 34 of the pot 20 on the rear side. There is. As a result, the flow of washing water that tends to be directed forward on the lateral side of the jar 20 on the front side of the rear wall 34 is directed from the top 38a of the slope 38 of the upper edge 36 of the jar 20 to the slope 38. The flow can be divided into a flow that descends along the upper edge 36 of the jar 20 and a flow that is guided forward from the outside of the slope 38 of the upper edge 36 of the jar 20. When the flow is separated on the side of the jar 20, it is disturbed. It can be made difficult. As a result, the forward flow that flows downward toward the front wall of the jar 20 while descending inside the jar 20 due to the inclined portion 38 and the rearward flow that flows rearward from the recess 26 toward the jar 20 are disrupted. It can be made difficult. According to such a configuration, when the vertically swirling flow rising along the front wall 32 and the backward flow heading from the recess 26 toward the pot 20 merge, it is possible to suppress the flow from colliding with each other. A stronger pushing flow from the front of the section 20 toward the bottom can be formed.

Furthermore, according to the flush toilet 1 according to the present embodiment, the recess 26 is formed in an inverted fan shape that widens from the front part of the waste receiving surface 16 toward the rear side in plan view. As a result, when the swirling flow of the washing water has relatively strong momentum and flows relatively forward of the recess 26 of the dirt receiving surface 16, it is possible to suppress the washing water from being collected in the recess 26, and the swirling flow of the washing water can be suppressed. When the momentum becomes relatively weak and the swirling flow flows relatively backward of the concave portion 26 of the dirt receiving surface 16, the cleaning water can be easily collected in the concave portion 26, and is directed from the concave portion 26 on the front side of the dirt receiving surface 16 toward the pot portion 20. This makes it easier to create a forced flow of waste flowing down. Therefore, a stronger pushing flow from the front of the pot 20 toward the bottom can be formed.

Further, according to the flush toilet 1 according to the present embodiment, the maximum width W1 of the recess 26 is smaller than the maximum width W2 of the pot 20 in plan view. Therefore, the forward flow on the sides of the jar can easily form a forward flow toward the front wall 32 of the jar 20 while descending inside the jar 20 due to the inclined portion 38, and the cleaning can be facilitated. By allowing the water to easily flow forward, the backward flow flowing backward from the concave portion 26 toward the pot portion 20 can be prevented from becoming too large and colliding with the forward flow from the slope portion 38. , which are combined to form a stronger pushing flow from the front to the bottom of the pot 20.

1 : Flush toilet bowl 6 : Bowl part 12 : Drain trap pipe 16 : Filth receiving surface 18 : Rim part 20 : Jar part 26 : Recessed part 26a : Rear end part 26c : Bottom part 26e : Bottom part 30 : Side wall 32 : Front wall 33 : Bottom part 34 : Rear wall 36 : Upper edge part 38 : Inclined part 38a : Top part 40 : Guide part

Claims (6)

A flush toilet that is flushed and discharges waste with flush water supplied from a flush water source,
A bowl portion comprising a bowl-shaped dirt receiving surface, a rim portion formed above the dirt receiving surface, and a pot portion formed below the dirt receiving surface to store water;
a drain trap conduit connected to the bottom of the pot;
The filth receiving surface includes a concave portion recessed downward from the front part of the filth receiving surface to the side part of the jar,
The above pot is
a side wall rising vertically on the lateral side;
A front wall rising vertically on the front side;
and an inclined part inclined so that the height of the upper edge of the side wall becomes lower toward the front,
The flush toilet is characterized in that the inclined portion extends forward from near the rear end of the recess. 2. The flush toilet according to claim 1, wherein the lowest part of the concave part of the filth receiving surface is located below the highest part of the inclined part of the pot part. The flush toilet according to claim 1 or 2, wherein the pot further includes a guide portion in which the upper edge of the side wall has a constant height behind the rear end of the recess. The water wash according to any one of claims 1 to 3, wherein the top of the slope of the upper edge of the jar is formed on the front side of the rear wall of the jar. toilet bowl. The flush toilet according to any one of claims 1 to 4, wherein the recessed portion is formed in an inverted fan shape that widens from the front part of the filth receiving surface toward the rear side in plan view. The flush toilet according to any one of claims 1 to 5, wherein the maximum width of the recessed portion is smaller than the maximum width of the pot portion in plan view.

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