JP7409410B2 - flush toilet - Google Patents

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, there is a flush toilet that makes it easier for flush water spouted from a first rim spout to reach a fourth divided area located at the front right side of the bowl part. Are known.

In addition, for example, as described in Patent Document 2, a first swirling flow having a large swirling radius of wash water discharged from a first spout is caused to flow into the first region to facilitate the discharge of waste, and BACKGROUND ART Flush toilets are known in which second flush water discharged from a second spout flows into a second area.

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.

JP2017-179958A JP2021-55437A JP2019-190217A

However, in the above-mentioned flush toilets of Patent Documents 1 to 3, when the amount of flushing water swirling around the bowl surface decreases in the latter half of cleaning, the flow that sinks the filth into the standing water becomes weaker, and as a result, floating filth is discharged. This caused the problem that floating dirt remained in the pot.

On the other hand, through intensive research, the present inventors have found that by increasing the flow rate of inflow into the front area of the water storage section in the latter half of the cleaning period, the ability to discharge floating filth can be improved. We have discovered that it is possible to prevent filth from remaining without being discharged.

However, when the wash water spouted from the spout forms a swirling flow on the bowl surface and this swirling flow flows into the water reservoir, the area where the wash water flows into the water reservoir as the flow rate of the wash water changes. As a result, a new problem arose in that the flow rate flowing into the front area of the bowl section became smaller in the latter half of the cleaning process.

Therefore, the present invention has been made to solve the problems of the prior art and the new problems that have arisen.The present invention has been made to solve the problems of the prior art and the new problems that have arisen. The purpose of the present invention is to provide a flush toilet capable of improving the ability to discharge fine particulate waste in the latter half of the period.

In order to achieve the above-mentioned object, the present invention provides a flush toilet which is flushed with flush water supplied from a flush water source and discharges filth, and which includes a bowl portion for receiving filth, and a bowl-shaped filth receptacle. a rim portion formed above the filth receiving surface; a water spout portion formed on the rim portion for discharging cleaning water; and a water reservoir portion formed below the filth receiving surface. , the water reservoir section has the water reservoir section divided into two in the front-rear direction and has a front region on the front side and a rear region on the rear side; The above-mentioned reservoir water is among the flow rate of the wash water swirling on the dirt receiving surface of the bowl section flowing into the above-mentioned water reservoir section during the first half of the cleaning period during which the wash water flows into the above-mentioned water reservoir section. Of the flow rate of wash water flowing into the water storage part in the latter half of the cleaning period, the proportion of the flow rate flowing into the front area of the water storage part is larger than the proportion of the flow rate flowing into the front area of the water storage part. It is a feature.
In one embodiment of the present invention configured in this way, the washing water for washing the dirt receiving surface flows onto the dirt receiving surface of the bowl portion during the first half of the cleaning period of the washing period in which the washing water for washing the dirt receiving surface flows into the water storage portion. Of the flow rate of cleaning water flowing into the water storage part during the latter half of the cleaning period, the proportion of the flow rate flowing into the front area of the water storage part is higher than the proportion of the flow rate flowing into the water storage part of the swirled washing water into the water storage part. The flow of cleaning water on the dirt receiving surface is formed so that the proportion of the flow rate flowing into the front region of the water storage section is increased. This makes it possible to relatively increase the proportion of the flow rate flowing into the front area of the water reservoir section during the latter half of the cleaning period, and improve the ability to discharge particulate dirt during the latter half of the cleaning period. It can prevent it from remaining in the water area. Therefore, the ability to discharge dirt during the latter half of the cleaning period can be improved.

In the present invention, preferably, the water reservoir section is formed along a front-rear center line that bisects the water reservoir section into the front region and the rear region in the front-rear direction, and into the right-hand region and the left-hand region in the left-right direction. It is divided into four areas by the horizontal center line dividing the area into two, and the main flow of the cleaning water formed on the dirt receiving surface during the first half of the cleaning period is directed to the dirt receiving surface of the right side area and the left side area. The cleaning water flows into the front region and/or the rear region of the one region located on the downstream side in the swirling direction of the washing water when viewed from the front of the washing water.
In an embodiment of the present invention configured as described above, the main flow of the cleaning water formed on the dirt receiving surface in the first half of the cleaning period is caused by the rotation of the washing water on the dirt receiving surface between the right region and the left region. In any one region located downstream along the direction, it flows into the front region and/or the rear region of the one region. As a result, in the latter half of the cleaning period, when the swirling of the cleaning water weakens and the area where the main stream of the cleaning water flows into the reservoir section shifts to the upstream side in the swirling direction, the main stream of the cleaning water flows into the reservoir section. It can be easily flowed into the front area of the body.

In the present invention, preferably, the dirt receiving surface of the bowl portion includes a concave portion 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 dirt receiving surface of the bowl portion includes a concave portion formed in an inverted fan shape that widens from the front part of the dirt receiving surface toward the rear side in plan view. ing. 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.

In the present invention, preferably, the water reservoir section is formed along a front-rear center line that bisects the water reservoir section into the front region and the rear region in the front-rear direction, and into the right-hand region and the left-hand region in the left-right direction. It is divided into four areas by the horizontal center line dividing the area into two, and one of the right side area and the left side area of the flow rate of washing water into the water storage part in the second half of the cleaning period. The proportion of the flow rate flowing into the front area is larger than the proportion of the flow rate flowing into the other three areas.
In one embodiment of the present invention configured in this manner, the flow rate of the wash water flowing into the water storage section in the latter half of the cleaning period may be reduced to one of the right side area and the left side area. The proportion of the flow rate flowing into the front area is larger than the proportion of the flow rate flowing into the other three areas. As a result, in the latter half of the cleaning period, the flow of cleaning water to the reservoir is relatively strong in the front region of either the right region or the left region among the four regions. Therefore, the ability to discharge fine particulate dirt during the latter half of the cleaning period can be further improved, and the ability to discharge dirt during the latter half of the cleaning period can be further improved.

According to the flush toilet of the present invention, the ability to discharge fine particulate waste can be improved.

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. FIG. 5 is a diagram illustrating the flow of washing water in the water reservoir section of the pot and the first half of the washing period in the cross-sectional view of FIG. 4 . FIG. 3 is a diagram showing simulation results of the kinetic energy of flushing water flowing into each area during a flushing period in a flush toilet according to an embodiment of the present invention. It is a figure which shows the result of simulating the number of discharged particulate wastes in a flushing period in a flush toilet according to one embodiment of the present invention. 5 is a diagram illustrating the flow of cleaning water in the latter half of the cleaning period in the cross-sectional view of FIG. 4. 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 is provided with a bowl part 6 for receiving waste 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 at once from a drain trap conduit. 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 seen from the user is referred to as the rear side, the right side as seen from the front of the flush toilet 1 is referred to as the right side, and the left side as seen 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 longitudinal width of 32 cm to 40 cm and a width of 22 cm to 30 cm 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, a pot part 20 formed below the dirt receiving surface 16 for storing water, and a dirt receiving surface 16. A water reservoir surface 21 is formed below the receiving surface 16. 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 water reservoir surface 21 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, and 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 spout 24 is further formed in the rim portion 18 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 when viewed from above, 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 structure of the pot portion 20 will be explained in detail with reference to FIGS. 1 to 4.
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.

According to the configuration of the inclined portion 38, the recessed portion 26, etc., among the swirling flows that swirl around the pot portion 20 on the waste receiving surface 16 as shown by the arrow F0, the flow as shown by the arrow F1 is reduced. , the flow that flows from the rear of the bowl section to the front side in a relatively inner region on the side of the pot section 20 first flows toward the front side along the guide section 40 as a substantially horizontal linear flow, and then continues. Therefore, the inclined portion 38 facilitates the formation of a downward flow toward the inside of the pot portion 20. The main flow of the forward flow toward the front wall 32 of the pot 20 flows from the reservoir surface 21 into the water, as shown by arrow F2 (see FIG. 2), and flows from the bottom 33 of the pot 20 to the front wall. 32, forming a vertically swirling flow that rises along the front wall.

Further, as shown by arrow F3 (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 makes it easier to guide the flow along the recess 26 to form a flow that is guided forward. 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 F4 (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. 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.

As shown by the arrow F5 (see FIGS. 2 and 4), there is a vertically swirling flow rising along the front wall 32 (the flow shown by the arrow F2), and a backward flow from the recess 26 toward the pot 20 (the flow shown by the arrow F4). This allows a stronger pushing flow to be formed from the front of the pot 20 toward the bottom. 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. 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. Moreover, such a forced flow can improve the ability to discharge fine particulate dirt or maintain the ability to discharge particulate dirt at a relatively high level. The filth pushed into the water together with the wash water is discharged downstream from the drain trap pipe 12. Such a pushing flow as shown by the arrow F5 is likely to be formed throughout the cleaning period, but as will be described later, in the latter half of the cleaning period E3, the front region of the pot 20 (the third region D3 and the fourth region D4 ) is more likely to be increased, making it easier to form a pushing flow as indicated by arrow F5 as described above.

Further, 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 cleaning period E1), the recess 26 at the position where it passes through is Since the depth is relatively shallow, it is possible to suppress the collection of cleaning water in the recess 26, and the momentum of the swirling flow of the cleaning water is relatively weak, so that when the swirling flow flows relatively behind the recess 26 of the dirt receiving surface 16. (For example, in the latter half of the cleaning period E3), 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.

Next, the water reservoir section will be described in detail with reference to FIG. 14.
The pot portion 20 forms a water storage surface 21 (a water storage surface W0 indicated by a dashed line in FIG. 3) as a water storage portion. The water reservoir surface 21 is formed by a front-rear center line C1 that bisects the water reservoir surface 21 into a front region and a rear region in the front-rear direction, and a left-right center line C2 that bisects the water reservoir surface 21 into a right region and a left region in the left-right direction. It is divided into two areas. The water reservoir surface 21 has a front region on the front side and a rear region on the rear side, which are obtained by dividing the water reservoir surface 21 into two in the front-rear direction. In the front region of the reservoir surface 21, the depth from the reservoir surface to the bottom is shallower than in the rear region, making it easier for the floating filth to be pushed in effectively by the flow from above using the vertical swirl flow. It has become. The longitudinal center line C1 is a line extending in the left-right direction at a position midway between the front wall 32 and the rear wall 34 on the water storage surface 21. The left-right center line C2 is a line extending in the front-rear direction at an intermediate position between the right side wall 30 and the left side wall 30 of the water reservoir surface 21. In the water reservoir surface 21, four regions are divided by the longitudinal center line C1 and the left-right center line C2, which are a first region D1, a second region D2, a third region D3, and a fourth region D4. In this embodiment, the water reservoir is defined by the water reservoir surface, but the water reservoir may be defined by the pot 20. In this case, the pot 20 has a front-rear center line C1 that bisects the pot 20 into a front region and a rear region in the front-rear direction, and a left-right center line C2 that bisects the pot 20 into a right-hand region and a left-hand region in the left-right direction. Accordingly, it can be defined that the area is divided into four areas.

Next, with reference to FIGS. 14 to 16, the flow of flush water in the flush toilet according to an embodiment of the present invention will be described.
In FIG. 15, in the flush toilet of this embodiment, the kinetic energy of the flushing water flowing into each region (first region D1, second region D2, third region D3, and fourth region D4) during the flushing period, that is, The inflow flow rate is shown by simulation results. In FIG. 15, the vertical axis shows changes in the kinetic energy [J] of the cleaning water, and the horizontal axis shows the passage of time. On the horizontal axis, the start of operation of the operating lever is defined as the start at time 0 [S]. The cleaning period during which the cleaning water for cleaning the dirt receiving surface flows into the reservoir section is from time T0 [S] to time T1 [S], and the cleaning water starts flowing into the reservoir surface 21 at time T0. At time T1, the flow of cleaning water contributing to cleaning into the reservoir surface 21 has substantially ended. When the flow rate of the wash water flowing into the reservoir surface 21 decreases to such an extent that it does not substantially contribute to cleaning, the flow of the wash water contributing to cleaning into the reservoir surface 21 is terminated (time T1). Note that the cleaning period is divided into three equal parts to define a first half cleaning period E1, an intermediate cleaning period E2, and a second half cleaning period E3. Note that the time when the cleaning water starts flowing into the reservoir surface 21 is almost the same as the time when water spouting from the water spout starts, so the cleaning period is defined as the period during which the cleaning water is being spouted. It may be set as a period from time T0 [S] when water spouting from the water spout starts to time T1 [S] when water spouting from the water spout ends.

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. Cleaning water is spouted from the first water spout 22 and the second water spout 24, and a swirling flow that swirls around the pot 20 on the dirt receiving surface 16 is formed as shown by arrow F10. The cleaning water gradually flows into the reservoir surface 21 in the pot 20 while forming a swirling flow. 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.

After the start of cleaning, in the first half period E1 of cleaning, the total flow rate of the cleaning water swirled on the dirt receiving surface 16 of the bowl portion 6 to the reservoir surface 21 is reduced to a proportion of the water reservoir surface 21 as shown by the arrow F11. The ratio of the inflow flow rate to the rear area (the first area D1 and the second area D2) is the front side of the water storage surface 21 as shown by the arrow F12 of the total inflow flow rate of the cleaning water to the water storage surface 21. It is larger than the ratio of the inflow flow rate to the regions (third region D3 and fourth region D4).

As shown in FIG. 17, in the second half of the cleaning period E3, out of the total flow rate of the cleaning water swirled on the dirt receiving surface 16 of the bowl part 6 into the reservoir surface 21, as shown by arrow F13, The proportion of the flow rate flowing into the front area (the third area D3 and the fourth area D4) of the water reservoir surface 21 is determined by the proportion of the flow rate flowing into the front side area (the third region D3 and the fourth region D4) of the water reservoir surface as shown by the arrow F14 out of the total flow rate of washing water into the water reservoir surface 21. 21 (first region D1 and second region D2). Further, according to the structure of the bowl portion 6 and the like of the present embodiment, the arrow F12 of the flow rate of cleaning water swirling on the dirt receiving surface 16 of the bowl portion 6 into the reservoir surface 21 during the first half of the cleaning period E1 is As shown in FIG. The proportion of the flow rate flowing into the front region (third region D3 and fourth region D4) of the water reservoir surface 21 as shown by arrow F13 increases. In this way, the ratio of the flow rate flowing into the front area of the reservoir water surface 21 in the second half of the cleaning period E3 is increased, and the ability to discharge particulate dirt in the second half of the cleaning period E3 is improved, or the ability to discharge particulate dirt is also increased in the second half of the cleaning period E3. It can be maintained relatively high.

In the first half of the cleaning period E1, the proportion of the flow rate of cleaning water flowing into the front area of the water storage surface 21 (the third area D3 and the fourth area D4) out of the flow rate of the washing water flowing into the water storage surface 21 is relatively low. There is. Then, of the flow rate of cleaning water flowing into the reservoir surface 21 in the second half of the cleaning period E3, the proportion of the flow rate flowing into the front region of the reservoir surface 21 (the third region D3 and the fourth region D4) becomes relatively large. There is. In the first half of cleaning period E1, the proportion of the flow rate of cleaning water flowing into the front region (third region D3 and fourth region D4) of the reservoir surface 21 out of the flow rate into the reservoir surface 21 is higher than the ratio of the flow rate into the front region of the reservoir surface 21 (third region D3 and fourth region D4). It can be confirmed that the proportion of the flow rate of the wash water flowing into the front region (third region D3 and fourth region D4) of the water reservoir surface 21 among the flow amount of the wash water flowing into the water reservoir surface 21 at this time is increased.

FIG. 16 shows the results of a simulation of the number of fine particles remaining to be discharged during the flushing period in the flush toilet of this embodiment. In FIG. 16, the vertical axis indicates the number of particles remaining to be discharged [units], and the horizontal axis indicates time [S]. In this simulation, fine particulate dirt is defined as minute particles, and immediately after the start of cleaning, the number of particulate dirt remaining to be discharged is 2500. The cleaning period in which the cleaning water is spouted is from time T0 [S] to time T1 [S], and as in FIG. A period E2 and a cleaning latter half period E3 are defined.
As described above, the ratio of the flow rate flowing into the front area of the reservoir water surface 21 in the second half of the cleaning period E3 becomes relatively large, so that the ability to discharge fine particulate dirt in the second half of the cleaning period E3 is improved, or even in the second half of the cleaning period E3. It can be seen that the ability to discharge dirt is maintained at a relatively high level, and in the latter half of the cleaning process, particulate dirt is reduced and can be discharged until it is almost completely eliminated. Furthermore, the ability to discharge not only fine dirt but also dirt during the latter half of the cleaning period can be improved.

In addition, in the flush toilet of this embodiment, the main flow of the flushing water formed on the filth receiving surface 16 during the first half of the cleaning period E1 (or the intermediate cleaning period E2) is directed to the right side area (the second Either one of the region D2 and the third region D3) and the left region (the first region D1 and the fourth region D4) located on the downstream side in the direction of rotation of the washing water when viewed from the front of the dirt receiving surface 16. area (the right side area or the left side area), for example, in the present embodiment, the right side area (the second area D2 and the third area D3), the front side area (in the present embodiment, the 3 region D3) and/or the rear region (in this embodiment, the second region D2).
As a result, as shown in FIG. 17, in the latter half of the cleaning period E3, the swirling of the cleaning water weakens, and the inflow region of the main flow of the cleaning water into the reservoir surface 21 is shifted upstream in the swirling direction (the swirling direction as shown by arrow F10). When it shifts to the side, as shown by the arrow F16, the main flow of the wash water can easily flow into the front region (the third region D3 and the fourth region D4) of the water reservoir surface 21. Therefore, the ability to discharge fine particulate dirt in the second half of cleaning period E3 is improved, or the ability to discharge particulate dirt is maintained relatively high even in the second half of cleaning period E3, and the remaining particulate dirt is reduced and discharged in the second half of cleaning period E3. I know what I can do. Furthermore, the ability to discharge not only fine dirt but also dirt during the latter half of the cleaning period can be improved.

Which of the right side area (second area D2 and third area D3) and left side area (first area D1 and fourth area D4) of the flow rate of cleaning water flowing into the reservoir surface 21 in the second half of cleaning period E3? The proportion of the flow rate flowing into the front side area (the fourth area D4 or the third area D3) in one of the areas (the right side area or the left side area) is higher than the proportion of the flow rate flowing into the other three areas. big. For example, in FIGS. 15 and 17, the right side area (second area D2 and third area D3) and the left side area (first area D1 and the fourth region D4) (for example, the left region), the ratio of the inflow flow rate to the front region (fourth region D4) (the ratio of the inflow flow rate as shown by the arrow F17) is different from the other region (for example, the left region). (ratios of inflow flow rates as shown by arrows F18, F19, and F20, respectively) to the three regions (first region D1, second region D2, and third region D3). For example, the inflow flow rate of the cleaning water is calculated as an average value in the latter half of the cleaning period E3. The particulate dirt and filth pushed into the water together with the washing water are discharged downstream from the drain trap pipe 12, and the washing is completed.

According to the flush toilet 1 according to the embodiment of the present invention described above, the filth receiving surface of the bowl portion 6 during the first half of the cleaning period E1 of the cleaning period in which the washing water for washing the filth receiving surface 16 flows into the water storage surface 21. The flow rate of the wash water flowing into the water storage surface 21 in the latter half of the cleaning period E3 is higher than the ratio of the flow rate of the washing water flowing into the water storage surface 21 into the water storage surface 21, which is swirled on the washing water 16, than the proportion of the flow amount flowing into the front side area of the water storage surface 21. A flow of cleaning water is formed on the dirt receiving surface 16 so that the proportion of the flow rate flowing into the front region of the water collecting surface 21 is increased. As a result, the ratio of the flow rate flowing into the front area of the reservoir water surface 21 during the second half of the cleaning period E3 can be made relatively large, and the ability to discharge fine particulate dirt during the second half of the cleaning period E3 can be improved. can be prevented from remaining on the water surface 21. Therefore, the ability to discharge dirt during the latter half of the cleaning period E3 can be improved.

Further, according to the flush toilet 1 according to the present embodiment, the main flow of the flushing water formed on the dirt receiving surface 16 in the first half of the cleaning period E1 is the main flow of the washing water on the dirt receiving surface 16 of the right side area and the left side area. In one of the regions located on the downstream side along the turning direction, it flows into the front region and the rear region of the one region. As a result, in the latter half of the cleaning period E3, when the swirling of the cleaning water weakens and the inflow area of the mainstream of the cleaning water into the reservoir surface 21 shifts to the upstream side in the swirling direction, the mainstream of the cleaning water flows into the reservoir. The water can easily flow into the front area of the water surface 21.

Further, according to the flush toilet 1 according to the present embodiment, the filth receiving surface 16 of the bowl portion 6 has a concave portion 26 formed in an inverted fan shape that expands from the front part of the filth receiving surface 16 toward the rear side in plan view. It is equipped with 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 water collecting surface 21. This makes it easier to create a forced flow of waste flowing down.

According to the flush toilet 1 according to the present embodiment, the flow rate of the flush water flowing into the reservoir surface 21 in the second half of the cleaning period E3 is directed to the front region in either the right region or the left region. The proportion of the inflow flow rate to the other three regions is larger than the respective proportions of the inflow flow rate to the other three regions. As a result, in the latter half of the cleaning period E3, the flow of the cleaning water toward the reservoir surface 21 is formed relatively strongly in the front region of either the right region or the left region among the four regions. This makes it possible to further improve the ability to discharge particulate dirt during the second half of the cleaning period E3, and further improve the ability to discharge dirt during the second half of the cleaning period E3.

1: Flush toilet 6: Bowl portion 16: Dirty receiving surface 18: Rim portion 26: Recessed portion

Claims (8)

A flush toilet that is flushed and discharges waste with flush water supplied from a flush water source,
A bowl portion that receives filth,
A bowl-shaped dirt receiving surface,
A rim portion formed above the dirt receiving surface;
a water spout portion formed on the rim portion and spouting cleaning water;
The bowl portion includes a pot portion formed below the dirt receiving surface and having a water storage surface formed inside the pot portion;
The water spout portion includes a first water spout formed on either the left or right side of the front region of the dirt receiving surface of the bowl portion, and the other on either the left or right of the rear region of the dirt receiving surface of the bowl portion. a second spout formed on the side of the
The dirt-receiving surface of the bowl portion includes a concave portion formed in an inverted fan shape that extends from the front of the dirt-receiving surface toward the rear side in plan view;
The water reservoir surface is divided into a front region and a rear region by a front-rear center line that bisects the water reservoir surface in the front-rear direction in plan view,
Of the flow rate of the wash water swirling on the dirt receiving surface of the bowl part flowing into the water collecting surface during the first half of the cleaning period during which the washing water for washing the dirt receiving surface flows into the water collecting surface. The water washing is characterized in that the proportion of the flow rate of the wash water flowing into the reservoir surface in the latter half of the cleaning period is larger than the proportion of the flow rate flowing into the front area. toilet bowl. The water retention surface has a front-rear center line that bisects the water retention surface into the front region and the rear region in the front-rear direction, and a left-right center line that bisects the water retention surface into the right region and the left region in the left-right direction. It is divided into four areas,
The mainstream of the cleaning water formed on the dirt receiving surface during the first half of the cleaning period is located on the downstream side of the right side area and the left area in the direction of rotation of the washing water when viewed from the front of the dirt receiving surface. 2. The flush toilet according to claim 1, wherein the water flows into the front region and/or the rear region of the one region. The water retention surface has a front-rear center line that bisects the water retention surface into the front region and the rear region in the front-rear direction, and a left-right center line that bisects the water retention surface into the right region and the left region in the left-right direction. It is divided into four areas,
Of the flow rate of wash water flowing into the reservoir surface in the second half of the cleaning period, the ratio of the flow rate flowing into the front area in either the right side area or the left side area is the same as that of the other three areas. A flush toilet according to claim 1 or 2 , wherein the respective proportions of the inflow flow into the area are greater than the respective proportions. 4. Any one of claims 1 to 3, wherein in the latter half of the cleaning period, the instantaneous value of the kinetic energy of the cleaning water flowing into the front area is greater than the instantaneous value of the kinetic energy of the cleaning water flowing into the rear area. The flush toilet described in section. The flush toilet according to any one of claims 1 to 4, wherein the depth of the recessed portion is formed to become deeper from the front portion of the filth receiving surface toward the rear side. 6. The recess extends from the front of the dirt receiving surface to the side of the jar, and the recess on the side of the jar is formed flat. The flush toilet described in . The pot includes a sloped portion such that the height of the upper edge of the side wall decreases toward the front;
The flush toilet according to any one of claims 1 to 6, wherein the inclined portion extends forward from near the rear end of the recess. 8. Any one of claims 1 to 7, wherein the pot includes a guide portion having a constant height at an upper edge of a side wall of the pot at a position rearward of the rear end of the recess. The flush toilet described in section.

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