Water-washable toilet
The flush toilet design improves waste discharge by guiding water flows to form a powerful pushing flow through a recessed surface and inclined wall configuration, addressing inefficiencies in conventional toilets.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TOTO LTD
- Filing Date
- 2023-12-19
- Publication Date
- 2026-06-18
Smart Images
Figure 0007875470000001 
Figure 0007875470000002 
Figure 0007875470000003
Abstract
Description
Technical Field
[0001] The present invention relates to a flushing toilet, and particularly to a flushing toilet that is flushed with flushing water supplied from a flushing water source to discharge dirt.
Background Art
[0002] Conventionally, for example, as described in Patent Document 1, the flushing water discharged from the first rim water outlet flows downward from the diagonally front side of the bowl portion toward the inlet of the drain pipe, and is discharged from the second rim water outlet. A flushing toilet is known in which the vertical swirling flow formed by the flushing water that dives into the concave portion below the dirt receiving surface from the rear side and the vertical swirling flow formed by the flushing water that dives into the concave portion from the side side combine to sink floating dirt into the accumulated water.
[0003] Also, for example, as described in Patent Document 2, the flushing water discharged from the first and second water outlets of the rim flows into the pot portion below the dirt receiving surface from the left side and also from the front side, and a flushing toilet that widely washes the dirt receiving surface is known.
[0004] Also, for example, as described in Patent Document 3, the flushing water discharged from the first water discharging portion of the rim causes a first diversion at the front portion of the dirt receiving surface, and this first diversion forms a main flow that flows down from the dirt receiving surface toward the accumulated water portion side. Further, the flushing water discharged from the second water discharging portion flows down into the accumulated water portion from the right side wall surface of the accumulated water portion, and a vertical swirling flow is formed in the accumulated water portion. A flushing toilet is known in which the induced flow in which these two flows merge pushes dirt into the toilet drain.
Prior Art Documents
Patent Documents
[0005]
Patent Document 1
Patent Document 2
Patent Document 3
[0006] In relation to the flush toilets described in Patent Documents 1 to 3 above, in order to suppress the adhesion of waste to the bowl, it was considered to further enlarge the water reservoir in the bowl. However, in such flush toilets, the amount of flushing water that flows down into the reservoir without swirling around the bowl surface increases, and for example, in the latter half of flushing, the amount of flushing water that swirls around the bowl surface decreases, weakening the flow that settles waste into the reservoir. As a result, waste, especially floating waste, becomes difficult to discharge, and waste remains in the reservoir.
[0007] In contrast, simply increasing the swirling flow to create a stronger flow that settles waste into the water resulted in a problem in conventional flush toilets: multiple flows attempting to enter the toilet bowl would collide with each other and interfere, making it difficult to discharge waste, especially floating waste.
[0008] Therefore, the present invention has been made to solve the problems and issues of the prior art, and aims to provide a flush toilet that can create a stronger push flow from the front of the pot towards the bottom, thereby improving waste discharge performance. [Means for solving the problem]
[0009] To achieve the above-mentioned objectives, the present invention provides a flush toilet that washes and discharges waste using washing water supplied from a washing water source, comprising: a bowl portion having a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface for storing accumulated water; and a drain trap pipe connected to the bottom of the pot portion, wherein the waste receiving surface has a recess that is recessed downward from the front of the waste receiving surface to the side portion of the pot portion, the pot portion has a side wall that rises vertically on the side, a front wall that rises vertically on the front, and an inclined portion that is inclined such that the height of the upper edge of the side wall decreases toward the front, the inclined portion is characterized in that it extends toward the front from near the rear end of the recess. In one embodiment of the present invention configured as described above, the urn portion is provided with an inclined portion such that the height of the upper edge of its side wall decreases toward the front, so that the flow flowing from the rear to the front of the bowl portion forms a forward flow toward the front wall of the urn portion as it descends toward the inside of the urn portion due to the inclined portion within the recess, and the descending forward flow hits the front wall and forms a vertical swirling flow that rises along the front wall. Furthermore, the waste receiving surface is provided with a recess that is recessed downward from the front of the waste receiving surface to the side portion of the urn portion, so that the flow flowing from the rear to the front of the bowl portion is guided toward the front from the outside of the inclined portion, and the washing water guided toward the front along the recess forms a flow toward the urn portion as it descends toward the rear from the recess at the front of the waste receiving surface. At this time, because the inclined portion extends toward the front from near the rear end of the recess and from the inside, the flow of washing water that flows into the recess flows along the recess. This prevents the washing water from flowing down from the side portion of the urn portion toward the inside of the urn portion and colliding with the forward flow in the inclined portion and the backward flow toward the urn portion as it descends toward the urn portion, thereby preventing these flows from being disturbed. Therefore, with this configuration, the vertical swirling flow rising along the front wall and the rearward flow from the recess toward the pot section can be formed without interfering with each other, and the merging of the vertical swirling flow rising along the front wall and the rearward flow from the recess toward the pot section can form a stronger pushing flow from the front of the pot section toward the bottom, thereby improving waste discharge performance.
[0010] In the present invention, preferably, the lowest part of the recess on the waste receiving surface is positioned below the highest part of the inclined portion of the pot. In one embodiment of the present invention configured in this manner, the lowest part of the recess in the waste receiving surface is positioned below the highest part of the inclined section of the jar. This makes it easier for the heights of the forward flow that descends into the inside of the jar by the inclined section towards the front wall of the jar and the backward flow that flows backward from the recess towards the jar to differ. This suppresses collisions between the forward flow from the inclined section and the backward flow from the recess, and makes it easier to form a stronger pushing flow from the front to the bottom of the jar, which is formed when these flows merge.
[0011] In the present invention, preferably, the pot portion further includes a guide portion in which the height of the upper edge of the side wall is constant behind the rear end of the recess. In one embodiment of the present invention configured in this manner, the bowl portion further includes a guide portion in which the height of the upper edge of the side wall is constant behind the rear end of the recess. As a result, the flow flowing from the rear to the front of the bowl portion can be guided as a flow that is straightened forward by the guide portion behind the rear end of the recess, making it less likely for the forward flow from the inclined portion to be disturbed, and a stronger pushing flow from the front to the bottom of the bowl portion, formed by the merging of the forward flow from the inclined portion and the rearward flow from the recess, can be created.
[0012] In the present invention, preferably, the uppermost part of the inclined portion of the upper edge of the pot portion is formed in front of the rear wall of the pot portion. In the embodiment of the present invention configured as described above, the uppermost part of the inclined portion on the upper edge of the pot is formed in front of the rear wall on the rear side of the pot. This allows the flow of washing water, which tends to be directed forward on the side of the pot in front of the rear wall, to be divided into a flow descending along the inclined portion from the uppermost part of the inclined portion on the upper edge of the pot, and a flow guided forward from the outside of the inclined portion on the upper edge of the pot, making it less likely for the flow to be disturbed when it is divided on the side of the pot. This makes it less likely for the forward flow that descends towards the front wall of the pot along the inclined portion and the rearward flow that flows from the recess toward the pot to be disturbed. With this configuration, collisions of flows are suppressed when the vertical swirling flow rising along the front wall and the rearward flow from the recess toward the pot merge, and a stronger pushing flow from the front toward the bottom of the pot can be formed.
[0013] In the present invention, preferably, the recess is formed in an inverted fan shape that widens from the front to the rear of the waste receiving surface when viewed from above. In one embodiment of the present invention configured in this way, the recess is formed in an inverted fan shape that widens from the front to the rear of the waste receiving surface when viewed from above. This suppresses the collection of the washing water by the recess when the force of the swirling flow of the washing water is relatively strong, such as during the first half of washing, and the swirling flow flows relatively far forward of the recess of the waste receiving surface. When the force of the swirling flow of the washing water is relatively weak, such as during the second half of washing, and the swirling flow flows relatively far rear of the recess of the waste receiving surface, it makes it easier to collect the washing water by the recess, and makes it easier to form a pushing flow of waste that flows down from the recess on the front side of the waste receiving surface towards the water reservoir. Therefore, a stronger pushing flow from the front to the bottom of the reservoir can be formed.
[0014] In the present invention, preferably, the maximum width of the recess is smaller than the maximum width of the vase portion in a plan view. In one embodiment of the present invention configured as described above, the maximum lateral width of the concave portion is smaller than the maximum lateral width of the pot portion in a plan view. Therefore, the forward flow on the side of the pot portion can be easily made to form a forward flow that descends inside the pot portion due to the inclined portion and heads toward the front wall of the pot portion. As a result, the washing water can easily flow forward as it is, suppressing the backward flow from the concave portion toward the pot portion from becoming too large and colliding with the forward flow from the inclined portion, and a pushing flow from the front to the bottom of the pot portion formed by the confluence of these can be formed more powerfully.
Effect of the Invention
[0015] According to the flushing toilet of the present invention, a pushing flow from the front to the bottom side of the pot portion can be formed more powerfully, improving the dirt discharge performance.
Brief Description of the Drawings
[0016] [Figure 1] It is a perspective view showing a flushing toilet according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view taken along line II-II of FIG. 1. [Figure 3] It is a cross-sectional view taken along line III-III of FIG. 1. [Figure 4] It is a cross-sectional view taken along line IV-IV of FIG. 2. [Figure 5] It is a cross-sectional view taken along line V-V of FIG. 3. [Figure 6] It is a cross-sectional view taken along line VI-VI of FIG. 3. [Figure 7] It is a cross-sectional view taken along line VII-VII of FIG. 3. [Figure 8] It is a cross-sectional view taken along line VIII-VIII of FIG. 3. [Figure 9] It is a cross-sectional view taken along line IX-IX of FIG. 3. [Figure 10] It is a cross-sectional view taken along line X-X of FIG. 3. [Figure 11] It is a cross-sectional view taken along line XI-XI of FIG. 3. [Figure 12] This is a cross-sectional view along the line XII-XII in Figure 3. [Figure 13] This is a cross-sectional view along the line XIII-XIII in Figure 3. [Modes for carrying out the invention]
[0017] Next, with reference to Figures 1 to 4, a flush toilet according to one embodiment of the present invention will be described. Figure 1 is a perspective view showing a flush toilet according to one embodiment of the present invention, Figure 2 is a cross-sectional view taken along line II-II in Figure 1, Figure 3 is a cross-sectional view taken along line III-III in Figure 1, and Figure 4 is a cross-sectional view taken along line IV-IV in Figure 2.
[0018] As shown in Figures 1 to 3, the flush toilet 1 is a flush toilet that washes away waste using flushing water supplied from a flushing water source. The flush toilet 1 is a wash-down type toilet that uses the flow of water due to the difference in water level in the bowl to wash away waste. The flush toilet 1 comprises a toilet body 2 and a water storage tank 4 that stores flushing water to wash the toilet body 2. The toilet body 2 is made of ceramic. The toilet body 2 has a bowl 6 on the front side. A common water passage 8 is formed at the upper rear of the bowl 6, with its upstream end communicating with the water storage tank 4, and a drainage pipe 10 for discharging waste is formed at the lower rear of the bowl 6. The flush toilet 1 may also be a so-called siphon-type flush toilet that uses a siphon action to suck up waste from the bowl 6 and discharge it to the outside all at once through a drainage trap pipe 12. Furthermore, in the following description of one embodiment of the present invention, the side closer to the user (the user standing in front of the flush toilet 1 to use it) is referred to as the front, the side further away from the user is referred to as the rear, the right side of the flush toilet 1 when viewed from the front is referred to as the right, and the left side when viewed from the front is referred to as the left.
[0019] A drain trap pipe 12 is connected to the bottom of the bowl section 6. The drain trap pipe 12 comprises an inlet pipe 12a connected to the bottom of the urn section of the bowl section 6 (described later), an upward pipe 12b extending diagonally upward and backward from the inlet pipe 12a, and a downward pipe 12c descending from the upward pipe 12b. The bowl section 6 and the drain trap pipe 12 are made of ceramic and are integrally molded with the toilet body 2. The bowl section 6 forms an egg shape with a vertical width of 32 cm to 40 cm in the front-to-back direction and a horizontal width of 22 cm to 30 cm when viewed from above.
[0020] The aforementioned water storage tank 4 is the source of flushing water, and a drain valve 14 is provided inside this water storage tank 4, which can be opened and closed by an operating lever (not shown). Note that flushing water may also be supplied to the toilet bowl 1 by a pump or the like, instead of the water storage tank 4.
[0021] The bowl section 6 comprises a bowl-shaped waste receiving surface 16, a rim section 18 formed above the waste receiving surface 16, and a pot section 20 formed below the waste receiving surface 16 for storing accumulated water. Here, the inner circumferential surface 18a of the rim section 18 has an overhanging shape toward the inside, as shown in Figure 12 and other figures described later, so that the swirling washing water described later does not splash out to the outside. The pot section 20 forms a roughly triangular shape that is closer to an egg shape (an ellipse shape that tapers towards the front) than the roughly triangular water surface W0, and in a top view, its vertical width in the front-to-back direction is 20 cm to 24 cm and its horizontal width in the left-to-right direction is 15 cm to 19 cm. Here, the water surface W0 of the urn section 20 is roughly triangular, with a vertical width of 160mm to 180mm in the front-to-back direction and a horizontal width of 125mm to 145mm in the left-to-right direction when viewed from above. This is larger (enlarged) than the water surface of a conventional flush toilet.
[0022] A first water outlet 22, which discharges flushing water, is formed on the left side of the inner circumference of the rim portion 18 of the bowl portion 6, in front of the center of the bisected front-to-back direction when viewed from the front. A second water outlet 24, which discharges flushing water, is formed on the right side of the center of the inner circumference when viewed from the front. These first water outlets 22 and 2 water outlets 24 are configured to form a swirling flow that rotates in the same direction (counterclockwise in Figure 1). The common water passage 8 formed at the rear upper part of the flush toilet 1 described above branches to the left and right after heading towards the front of the toilet, supplying flushing water to the first water outlet 22 or the second water outlet 24. Note that there may be one or more water outlets that discharge flushing water. Furthermore, by reversing the direction of water discharge from the water outlets such as the first water outlet 22 and the second water outlet 24, a swirling flow in a clockwise direction may be formed within the bowl portion.
[0023] Next, the waste receiving surface 16 will be described as shown in Figures 1 to 13, etc. The waste receiving surface 16 has a recess 26 that is recessed downward from the front of the waste receiving surface 16 to the side portion of the jar 20. As shown in Figure 4, in a plan view, the recess 26 is formed in an inverted fan shape that widens from the front of the waste receiving surface 16 toward the rear. The recess 26 forms a recessed portion that is deeper than the surrounding surface of the waste receiving surface 16 (for example, a portion of a curved surface that would normally protrude convexly if the curved surface is formed to match the surrounding shape is deliberately made flat, or a portion of a relatively flat surface is recessed downward). The recess 26 forms a washing water guide portion that is slightly lower than the surrounding waste receiving surface from the rear end 26a to the front of the waste receiving surface. In addition, the rear end 26a of the recess 26 is connected relatively smoothly to the surrounding waste receiving surface 16. The rear end 26a is located forward of the portion of the side wall 30 that has the maximum width in the left-right direction between the left and right side walls 30 of the jar 20. Furthermore, the rear end portion 26a is located behind the front wall 32 of the vase portion 20 when viewed from above, and is located in the central region A2, which will be described later.
[0024] Because the inflection portion of the curved surface of the recess 26 is difficult to represent in the drawing, the region of the recess 26 is virtually shown in Figure 4 as the region inside the dashed line. In the cross-section shown in Figure 5, the recess 26 is formed in region B1 of the waste receiving surface 16. The outer end 26b of the recess 26 (both ends of region B1) forms an inflection point where the surface changes downward relative to the surrounding waste receiving surface 16. The bottom 26c of the recess 26 in region B1 is formed to be relatively shallow.
[0025] In the cross-section shown in Figure 6, the recess 26 is formed in region B2 on the waste receiving surface 16. The outer ends 26b of the recess 26 (both ends of region B2) form inflection points where the surface changes downward relative to the surrounding waste 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 ends 26b and the bottom 26c in region B2 is larger (deeper) than the height (depth) between the outer ends 26b and the bottom 26c in region B1. The radius of curvature of the bottom 26c shown in Figure 6 is larger than the radius of curvature of the bottom 26c shown in Figure 5.
[0026] In the cross-section shown in Figure 7, the recess 26 is formed in region B3 on the waste receiving surface 16. The outer ends 26b of the recess 26 (both ends of region B3) form inflection points where the surface changes downward relative to the surrounding waste receiving surface 16. The width between the outer ends 26b in region B3 is greater than the width between the outer ends 26b in region B2. The height (depth) between the outer ends 26b and the bottom 26c in region B3 is greater (deeper) than the height (depth) between the outer ends 26b and the bottom 26c in region B2. The radius of curvature of the bottom 26c shown in Figure 7 is greater than the radius of curvature of the bottom 26c shown in Figure 6.
[0027] In the cross-section shown in Figure 8, the recess 26 is formed in region B4 on the waste receiving surface 16. The outer ends 26b of the recess 26 (both ends of region B4) form inflection points where the surface changes downward relative to the surrounding waste receiving surface 16. The width between the outer ends 26b in region B3 is greater than the width between the outer ends 26b in region B3. The height (depth) between the outer ends 26b and the bottom 26c in region B4 is greater (deeper) than the height (depth) between the outer ends 26b and the bottom 26c in region B3. The radius of curvature of the bottom 26c shown in Figure 8 is greater than the radius of curvature of the bottom 26c shown in Figure 7.
[0028] In the cross-section shown in Figure 9, the recess 26 is formed in region B5 on the waste receiving surface 16. The outer ends 26b of the recess 26 (both ends of region B5) form inflection points where the surface changes downward relative to the surrounding waste receiving surface 16. The width between the outer ends 26b in region B5 is greater than the width between the outer ends 26b in region B4. The height (depth) between the outer ends 26b and the bottom 26c in region B5 is greater (deeper) than the height (depth) between the outer ends 26b and the bottom 26c in region B4. At the position of the cross-section shown in Figure 9, the bottom 26c is the lowest point 26e of the recess 26. The lowest point 26e of the recess 26 is located below the uppermost part 38a of the inclined portion 38 of the pot portion 20, as will be described later. The radius of curvature of the bottom 26c shown in Figure 9 is greater than the radius of curvature of the bottom 26c shown in Figure 8.
[0029] In the cross-section shown in Figure 10, the recess 26 is formed in region B6 on the waste receiving surface 16. At this cross-sectional position, the inclined portion 38 of the upper edge 36 of the side wall 30 is formed inside the recess 26. The recess 26 is recessed in such a way that a part of the convexly protruding curved surface (a curved surface connecting the waste receiving surface 16 and the inclined portion 38) is flattened. The outer end 26b of the recess 26 (both ends of region B6) forms an inflection point where the surface changes downward relative to the surrounding waste receiving surface 16. The inner end 26d of the recess 26 (the inner end of region B6) forms an inflection point where the surface changes further downward from the recess 26 toward the inclined portion 38. The width between the left and right outer end 26b of the recess 26 is larger than the width between the left and right outer end 26b in region B5 as shown in Figure 9.
[0030] In the cross-section shown in Figure 11, the recess 26 is formed in region B7 on the waste receiving surface 16. An inclined portion 38 is formed on the inside of the recess 26. The recess 26 is recessed in such a way that a part of the convexly protruding curved surface is flattened. The outer end 26b of the recess 26 (both ends of region B7) forms an inflection point where the surface changes downward relative to the surrounding waste receiving surface 16. The inner end 26d of the recess 26 (the inner end of region B7) forms an inflection point where the surface changes further downward from the recess 26 toward the inclined portion 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 end 26b 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 Figure 10.
[0031] In the cross-section shown in Figure 12, the recess 26 is formed in region B8 on the waste receiving surface 16. An inclined portion 38 is formed on the inside of the recess 26. The recess 26 is recessed in such a way that a part of the convexly protruding curved surface is flattened. The outer end 26b of the recess 26 (both ends of region B8) forms an inflection point where the surface changes downward relative to the surrounding waste receiving surface 16. The inner end 26d of the recess 26 (the inner end of region B8) forms an inflection point where the surface changes further downward from the recess 26 toward the inclined portion 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 end 26b 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 Figure 11. The width between the outer ends 26b on both sides of region B8 is defined as the maximum width W1 of the recess 26. As shown in Figure 4, the maximum width W1 of the recess 26 is smaller than the maximum width W2 of the pot portion 20 in a plan view. In the portion that forms the maximum width W2 of the pot portion 20, a guide portion 40 is formed on the upper edge portion 36, and the recess 26 is not formed therein. Therefore, the swirling flow that turns from the rear to the front is easily guided from the guide portion 40 to the inclined portion 38 in the portion that forms the maximum width of the pot portion 20.
[0032] In the cross-section shown in Figure 13, the recess 26 is not formed, and the guide portion 40 of the upper edge 36 is formed on the waste receiving surface 16.
[0033] Next, the jar section 20 will be described in detail with reference to Figures 1 to 4. A water reservoir 28 is formed inside the pot portion 20, with the water level W0 indicated by a dashed line. The pot portion 20 includes a side wall 30 that rises vertically on the lateral side, a front wall 32 that rises vertically on the front side, a rear wall 34 that rises vertically on the rear side, an inclined portion 38 that inclines the upper edge 36 of the side wall 30 so that its height decreases toward the front, and a guide portion 40 in which the height of the upper edge 36 of the side wall 30 is constant behind the rear end 26a of the recess 26.
[0034] The front wall 32 is formed to rise from the bottom 33 of the pot section 20. 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 section 38 to flow into the water from the surface and then form a vertical swirling motion along the front wall 32. The vertical swirling flow at this time is a flow that rises from the bottom 33 along the front bottom corner 41 to the front wall 32, resulting in a relatively compact vertical swirling flow up to the top of the front wall 32. In addition, because the angle of the front bottom corner 41 is relatively small, when a flow directed towards the front hits the front bottom corner 41 from the bottom, it is easier to form a vertical swirling motion that rises along the front wall 32. A longitudinal swirling flow can be formed even if the forward flow does not hit the bottom, but a longitudinal swirling flow can be formed more efficiently by hitting the bottom and then rising along the front bottom corner section 41.
[0035] As shown in Figure 2, the inclined portion 38 extends forward from near and inside the rear end 26a of the recess 26. Because the curved portion of the inclined portion 38 is difficult to represent in the drawing, the area of the inclined portion 38 is virtually shown as the area inside the dashed line in Figures 2 to 4. The inclined portion 38 extends forward from the lateral area of the middle region A2, one of the three regions (front region A1, middle region A2, and rear region A3) into which the pot portion 20 is divided in the front-rear direction. The rear end 26a of the recess 26 is also located in the lateral area of the middle region A2. Furthermore, as shown in Figures 11 and 12, the inclined portion 38 forms a curved corner in the longitudinal section, and a shelf-like flow channel is formed on its upper side. The uppermost part 38a of the inclined portion 38 is formed forward of the rear wall 34 of the pot portion 20. The uppermost part 38a of the inclined section 38 acts as an inflection point where it bends downward from the guide section 40, making it easier to initiate the flow of cleaning water downward and inward. The inclined section 38 forms a downward inclination angle of 2 to 35 degrees relative to the guide section 40. The inclined section 38 forms a surface that is inclined downward more than the guide section 40. The lower end of the inclined section 38 is connected slightly below the top of the front wall 32. Once the cleaning water flows into the inclined section 38, its flow toward the outer recess 26 is suppressed, making it less likely to interfere with the cleaning water flowing over the recess 26. Therefore, the cleaning water flowing from the inclined section 38 into the inside of the tub section 20 and the cleaning water flowing over the recess 26 to the front side of the waste receiving surface 16 are less likely to interfere with each other, and the two flows can be formed more efficiently and powerfully.
[0036] The guide section 40 extends almost horizontally from the rear end of the inclined section 38 toward the rear wall 34. Because the curved portion of the guide section 40 is difficult to represent in the drawings, the area of the guide section 40 is virtually shown as the area inside the dashed line in Figures 2 and 3.
[0037] Next, with reference to Figure 4, the flow of flushing water in a flush toilet according to one embodiment of the present invention will be explained. First, when the user operates the operating lever (not shown) of the water storage tank 4, the drain valve 14 opens and cleaning water is supplied from the water storage tank 4 to the common water channel 8. As shown by arrows F1 and F2, cleaning water is discharged from the first outlet 22 and the second outlet 24, and as shown by arrows F3 and F4, a swirling flow is formed on the waste receiving surface 16 that swirls around the pot section 20. At this time, in the lateral region of the pot section 20, the direction of the cleaning water flow tends to be relatively aligned forward compared to the front and rear regions of the pot section.
[0038] At this time, as shown by arrow F5 (see Figures 2 and 4), the flow that flows from the rear to the front of the bowl section in the relatively inner area on the side of the pot section 20 first flows along the guide section 40 as a nearly horizontal, linear flow toward the front, and then forms a flow that descends toward the inside of the pot section 20 by the inclined section 38. At this time, the flow of washing water that has entered the inclined section 38 flows along the inclined section 38 or flows inward from the inclined section 38 and enters the reservoir water surface WO. In this way, the main flow of the forward-facing flow that descends toward the inside of the pot section 20, enters the water from the reservoir water surface WO, and heads toward the front wall 32 of the pot section 20, forms a vertical swirling flow that rises along the front wall by hitting the front wall 32 from the bottom 33 of the pot section 20, as shown by arrow F6 (see Figure 2). Note that it is also possible to form a vertical swirling flow that rises along the front wall by hitting the front wall 32 of the pot section 20 instead of the bottom 33 of the pot section 20.
[0039] Furthermore, as shown by arrow F7 (see Figures 2 and 4), the flow from the rear to the front of the bowl portion in the area slightly outside the side of the urn portion 20 is guided from the outside of the inclined portion 38 toward the front, forming a flow that is guided toward the front along the recess 26. At this time, the flow of washing water that has once entered the recess 26 is guided toward the front along the recess 26, and it is possible to suppress the disruption of these flows by preventing them from colliding with the forward flow in the inclined portion 38 or the backward flow from the recess 26 toward the urn portion 20, which will be described later.
[0040] As shown by arrow F8 (see Figures 2 and 4), a portion of the washing water guided forward along the recess 26 forms a flow that flows backward from the recess 26 at the front of the waste receiving surface 16 towards the jar 20. As shown by arrow F9 (see Figure 4), the other portion of the washing water guided forward along the recess 26 continues to swirl on the waste receiving surface 16. At this time, since the recess 26 forms a recessed portion compared to the waste receiving surface 16, it is easier to form a flow that flows backward from the recess 26 towards the jar 20.
[0041] The vertical swirling flow rising along the front wall 32 (flow indicated by arrow F6) and the rearward flow from the recess 26 toward the basin 20 (flow indicated by arrow F8) merge, and as shown by arrow F10 (see Figures 2 and 4), a stronger pushing flow from the front to the bottom of the basin 20 can be formed. Therefore, the merged flow strengthens the pushing flow from the front to the bottom of the basin 20, further improving the waste discharge performance. In addition, such a pushing flow can improve the discharge capacity of fine waste (floating waste) or maintain a relatively high discharge capacity for fine waste. In the front region of the basin 20, the depth from the water surface to the bottom is shallower than in the rear region, making it easier for the pushing of floating waste by the upward flow using the vertical swirling flow to function effectively. The waste pushed into the water along with the washing water is discharged downstream from the drain trap pipe 12.
[0042] Furthermore, when the swirling flow of the washing water is relatively strong and flows relatively far forward of the recess 26 of the waste receiving surface 16 (for example, during the first half of washing), the depth of the recess 26 at the point of passage is relatively shallow, thus suppressing the collection of washing water by the recess 26. Conversely, when the swirling flow of the washing water is relatively weaker and flows relatively far backward of the recess 26 of the waste receiving surface 16 (for example, during the second half of washing), the relatively deep recess 26 at the point of passage makes it easier for the washing water to be collected by the recess 26. Therefore, it becomes easier to form a flow that pushes waste down from the recess 26 on the front side of the waste receiving surface 16 towards the water reservoir.
[0043] In the flush toilet 1 according to the embodiment of the present invention described above, the bowl portion 20 is provided with an inclined portion 38 such that the height of the upper edge portion 36 of its side wall 30 decreases toward the front. As a result, the flow from the rear to the front of the bowl portion 6 forms a forward flow toward the front wall 32 of the bowl portion 20 as it descends toward the inside of the bowl portion 20 due to the inclined portion 38 inside the recess 26, and when the descending forward flow hits the front wall 32, it forms a vertical swirling flow that rises along the front wall 32. Furthermore, the waste receiving surface 16 is provided with a recess 26 that is recessed downward from the front of the waste receiving surface 16 to the side portion of the bowl portion 20. As a result, the flow from the rear to the front of the bowl portion 6 is guided toward the front from the outside of the inclined portion 38, and the flushing water guided toward the front along the recess 26 forms a flow that flows toward the rear from the recess 26 at the front of the waste receiving surface 16 toward the bowl portion 20. At this time, since the inclined portion 38 extends from near the rear end 26a of the recess 26 and from the inside toward the front, the flow of washing water that flows into the recess 26 flows along the recess 26. As a result, the washing water flows down from the side portion of the pot portion 20 to the inside of the pot portion 20 and is prevented from colliding with the forward flow in the inclined portion 38 and the rearward flow from the recess 26 at the front of the waste receiving surface 16 toward the pot portion 20, thereby preventing disruption of these flows. With this configuration, the vertical swirling flow rising along the front wall 32 and the rearward flow from the recess 26 toward the pot portion 20 are more easily formed without interfering with each other, and the pushing flow toward the bottom of the pot portion 20, formed by the merging of the vertical swirling flow rising along the front wall 32 and the rearward flow from the recess 26 toward the pot portion 20, can be formed more strongly, thereby improving the waste discharge performance.
[0044] Furthermore, in the flush toilet 1 according to this embodiment, the lowest part 26e of the recess 26 of the waste receiving surface 16 is positioned lower than the highest part 38a of the inclined portion 38 of the urinal portion 20. As a result, the heights of the forward flow that descends into the inside of the urinal portion 20 by the inclined portion 38 and heads toward the front wall 32 of the urinal portion 20 and the backward flow that flows backward from the recess 26 toward the urinal portion 20 tend to differ. This suppresses collisions between the forward flow from the inclined portion 38 and the backward flow from the recess 26, and makes it easier to form a stronger pushing flow from the front to the bottom of the urinal portion 20 that is formed by the merging of these flows.
[0045] Furthermore, according to the flush toilet 1 of this embodiment, the bowl portion 20 further includes a guide portion 40 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 26. As a result, the flow that flows from the rear to the front of the bowl portion 6 can be guided as a flow that is straightened forward by the guide portion 40 behind the rear end portion 26a of the recess 26, making it less likely for the forward flow from the inclined portion 38 to be disturbed, and the forward flow from the inclined portion 38 and the rearward flow from the recess 26 to merge to form an even stronger pushing flow from the front to the bottom of the bowl portion 20.
[0046] Furthermore, in the flush toilet 1 according to this embodiment, the uppermost part 38a of the inclined portion 38 of the upper edge 36 of the urn portion 20 is formed in front of the rear wall 34 on the rear side of the urn portion 20. This allows the flow of flushing water, which tends to be directed forward on the side of the urn portion 20 in front of the rear wall 34, to be divided into a flow that descends along the inclined portion 38 from the uppermost part 38a of the inclined portion 38 of the upper edge 36 of the urn portion 20, and a flow that is guided forward from the outside of the inclined portion 38 of the upper edge 36 of the urn portion 20, making it less likely for the flow to be disturbed when it is divided on the side of the urn portion 20. As a result, the forward flow that descends towards the front wall of the urn portion 20 while moving inward along the inclined portion 38 and the rearward flow that flows from the recess 26 towards the urn portion 20 are less likely to be disturbed. With this configuration, collisions between the vertically swirling flow rising along the front wall 32 and the rearward flow from the recess 26 toward the pot portion 20 are suppressed when they merge, and a stronger pushing flow toward the bottom of the pot portion 20 can be formed.
[0047] Furthermore, in the flush toilet 1 according to this embodiment, the recess 26 is formed in an inverted fan shape that widens from the front to the rear of the waste receiving surface 16 when viewed from above. This suppresses the collection of flush water by the recess 26 when the force of the swirling flow of flushing water is relatively strong and the swirling flow flows relatively far forward of the recess 26 on the waste receiving surface 16, and makes it easier for the flush water to be collected by the recess 26 when the force of the swirling flow of flushing water is relatively weak and the swirling flow flows relatively far rear of the recess 26 on the waste receiving surface 16, thereby making it easier to form a pushing flow of waste that flows down from the recess 26 on the front side of the waste receiving surface 16 toward the urinal 20. Therefore, a stronger pushing flow toward the bottom of the urinal 20 from the front can be formed.
[0048] Furthermore, in the flush toilet bowl 1 according to this embodiment, the maximum width W1 of the recess 26 is smaller than the maximum width W2 of the urinal 20 in a plan view. Therefore, the forward flow from the side of the urinal 20 can easily form a forward flow toward the front wall 32 of the urinal 20 as it descends into the inside of the urinal 20 by the inclined portion 38, and the flushing water can easily flow forward as a result, which prevents the backward flow from the recess 26 toward the urinal 20 from becoming too large and colliding with the forward flow from the inclined portion 38, and further strengthens the push flow toward the bottom of the urinal 20 that is formed by the merging of these flows. [Explanation of symbols]
[0049] 1: Flush toilet 6: Bowl section 12: Drain trap pipe 16: Waste receiving surface 18: Rim section 20: Jar section 26: Recess 26a: Rear end 26c: bottom 26e: Bottom 30: Side wall 32: Front wall 33: Bottom 34: Back wall 36: Upper edge 38: Inclined part 38a: Top 40: Induction part
Claims
1. A flush toilet that is cleaned and discharges waste using flushing water supplied from a flushing water source, A bowl-shaped waste receiving surface, a rim formed above the waste receiving surface, and a pot-shaped section formed below the waste receiving surface for storing accumulated water, comprising: It comprises a drain trap pipe connected to the bottom of the above-mentioned pot section, The waste receiving surface is provided with a recess that is indented downward from the front of the waste receiving surface to the side portion of the pot, The above-mentioned pot part is, A side wall that rises vertically on the lateral side, A front wall that rises vertically on the front side, The above side wall comprises an inclined portion that is sloped such that the height of the upper edge of the side wall decreases toward the front, The above-mentioned inclined portion extends forward from near the rear end of the above-mentioned recess, A flush toilet characterized in that the uppermost part of the inclined portion of the upper edge of the pot portion is formed in front of the rear wall on the rear side of the pot portion.
2. The flush toilet according to claim 1, wherein the lowest part of the recess on the waste receiving surface is positioned lower than the highest part of the inclined section of the pot.
3. The flush toilet according to claim 1 or 2, wherein the recess is formed in an inverted fan shape that widens from the front to the rear of the waste receiving surface when viewed from above.
4. The flush toilet according to any one of claims 1 to 3, wherein the maximum width of the recess is smaller than the maximum width of the pot portion in a plan view.