Water closet

Abstract

The water-washing toilet of the present invention is configured to have a basin portion, which includes a basin-shaped waste receiving surface, an inner edge portion, a water outlet portion formed in the inner edge portion, and a water storage portion having a front side region and a rear side region. During the washing period when the washing water for washing the waste receiving surface flows into the water storage portion, the proportion of the inflow rate of the washing water into the front side region of the water storage portion in the second half of the washing period to the total inflow rate of the washing water into the water storage portion is greater than the proportion of the inflow rate of the washing water into the front side region of the water storage portion to the total inflow rate of the washing water into the water storage portion in the first half of the washing period.

Description

Technical Field

[0001] This invention relates to a water-washing toilet, and more particularly to a water-washing toilet that uses washing water supplied by a washing water source to wash and discharge waste. Background Technology

[0002] Previously, for example, a water-washing toilet as described in Patent Document 1 is known, which facilitates the delivery of washing water from the first inner edge spout to the fourth partitioned area on the right front of the basin.

[0003] Furthermore, for example, a water-washing toilet as described in Patent Document 2 is known, which causes a first swirling flow with a large radius of swirl of the washing water discharged from a first spout to flow into a first area, making it easier to discharge waste, and causes a second washing water discharged from a second spout to flow into a second area.

[0004] Furthermore, for example, in a water-washing toilet as described in Patent Document 3, the washing water discharged from a first discharge section on the inner edge creates a first branch at the front of the waste receiving surface, forming a main stream that flows down from the waste receiving surface to the water storage section. Additionally, the washing water discharged from a second discharge section flows down from the right side wall of the water storage section into the water storage section, forming a longitudinal swirling flow within the water storage section. The combined flow of these two water streams pushes the waste towards the toilet drain pipe.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2017-179958;

[0008] Patent Document 2: Japanese Patent Application Publication No. 2021-55437;

[0009] Patent document 3: Japanese Patent Application Publication No. 2019-190217.

[0010] The problem that the invention aims to solve

[0011] However, in the water-washing toilets described in the aforementioned patent documents 1 to 3, if less washing water swirls around the basin surface during the latter half of the washing process, the water flow used to settle waste into the storage water also weakens. As a result, problems arise such as floating waste being difficult to remove and floating waste remaining in the pot.

[0012] In response, the inventors of this application, through dedicated research, have reached the following conclusion: by increasing the inflow rate into the front area of ​​the water storage section during the second half of the washing process, the discharge capacity of floating debris can be improved, and the situation where floating debris remains undischarged can be suppressed.

[0013] However, the following new problem arises: when the washing water discharged from the spout forms a swirling flow on the surface of the basin and flows into the water storage section, the flow rate of the washing water changes and the area where the washing water flows into the water storage section changes, with the inflow rate into the front area of ​​the basin decreasing during the latter half of the washing process.

[0014] Therefore, the present invention was made to solve existing technical problems and new issues, and its purpose is to provide a water-washing toilet that increases the proportion of the inflow flow into the front area of ​​the water storage section during the second half of the washing process, thereby improving the ability to remove particulate matter during the second half of the washing process. Summary of the Invention

[0015] To achieve the above objectives, the present invention provides a water-washing toilet that uses washing water supplied by a washing water source to wash and discharge waste, and has a basin for receiving waste. The basin includes: a basin-shaped waste receiving surface; an inner edge formed above the waste receiving surface; a water outlet formed on the inner edge for discharging washing water; and a water storage section formed below the waste receiving surface. The water storage section has a front side region and a rear side region formed in a front-rear direction. During the washing period when washing water for washing the waste receiving surface flows into the water storage section, the proportion of the inflow rate of washing water into the front side region of the water storage section in the latter half of the washing period to the total inflow rate of washing water into the water storage section is greater than the proportion of the inflow rate of washing water into the front side region of the water storage section to the total inflow rate of washing water into the water storage section in the first half of the washing period.

[0016] In this invention, the flow of washing water on the soiled surface is formed such that, during the washing process where washing water flows into the water reservoir, the proportion of the inflow rate of washing water into the front region of the water reservoir during the latter half of the washing process is greater than the proportion of the inflow rate of washing water into the front region of the water reservoir during the first half of the washing process. Therefore, according to this invention, the proportion of the inflow rate of washing water into the front region of the water reservoir during the latter half of the washing process is increased relative to the total inflow rate of washing water into the water reservoir, thereby improving the discharge capacity of particulate matter during the latter half of the washing process and suppressing the residue of particulate matter in the water reservoir during the latter half of the washing process. Thus, according to this invention, the discharge capacity of soiled surfaces during the latter half of the washing process is improved.

[0017] In this invention, preferably, the water storage section is divided into four regions by a front-to-back center line and a left-to-right center line. The front-to-back center line divides the water storage section into a front region and a rear region in the front-to-back direction, and the left-to-right center line divides the water storage section into a right region and a left region in the left-to-right direction. During the first half of the washing process, the main stream of washing water formed on the dirt receiving surface flows into the front region and / or rear region of any region located downstream of the swirling direction of the washing water in the right region and the left region.

[0018] In this invention, constructed in this manner, during the first half of the washing process, the main stream of washing water formed on the soil-receiving surface flows into the front and / or rear regions of either the right or left side regions along the swirling direction of the washing water. Therefore, according to the invention, during the second half of the washing process, when the swirling of the washing water weakens and the inflow area of ​​the main stream of washing water into the storage section changes in a manner that shifts upstream in the swirling direction, the main stream of washing water easily flows into the front region of the storage section.

[0019] In this invention, preferably, the waste receiving surface of the basin has a recess, which is formed in the shape of a fan extending from the front of the waste receiving surface toward the rear when viewed from above.

[0020] In this invention, the waste-receiving surface of the basin has a recess that is fan-shaped, extending from the front of the waste-receiving surface toward the rear when viewed from above. Therefore, according to the invention, when the swirling flow of the washing water is strong during the first half of the washing process and flows past the front side of the recess on the waste-receiving surface, the accumulation of washing water in the recess can be suppressed. Conversely, when the swirling flow of the washing water weakens during the second half of the washing process and flows past the rear side of the recess on the waste-receiving surface, the washing water can easily accumulate in the recess, facilitating the formation of a pressure flow against the waste flowing down from the recess on the front side of the waste-receiving surface toward the water storage section.

[0021] In this invention, preferably, the water storage section is divided into four regions by a front-to-back center line and a left-to-right center line. The front-to-back center line divides the water storage section into a front region and a rear region in the front-to-back direction, and the left-to-right center line divides the water storage section into a right region and a left region in the left-to-right direction. During the second half of the washing period, the proportion of the inflow of washing water from either the right region or the left region into the front region relative to the "total inflow of washing water into the water storage section" is greater than the proportion of the inflow of washing water into the other three regions relative to the "total inflow of washing water into the water storage section".

[0022] In this invention, the proportion of the inflow rate of the washing water into the front area of ​​either the right or left region during the second half of the washing process, relative to the total inflow rate of the washing water into the storage tank, is greater than the respective proportions of the inflow rate of the washing water into the other three regions relative to the total inflow rate of the washing water into the storage tank. Therefore, according to this invention, during the second half of the washing process, a strong flow of washing water into the storage tank can be formed in the front area of ​​either the right or left region of the four regions, further improving the removal capacity of particulate matter and contaminants during the second half of the washing process.

[0023] In this invention, preferably, the basin has a pot portion forming a water storage portion, and the flush toilet also has a drain bend pipe connected to the bottom of the pot portion. The waste receiving surface has a recess, which is formed in the area from the front part of the waste receiving surface to the side part of the pot portion. The pot portion has a longitudinally erected side wall and a longitudinally erected front wall. The side wall has an inclined portion, which is inclined in such a way that the height of the upper edge of the side wall decreases as it faces forward. The inclined portion extends forward from near the rear end of the recess.

[0024] In this invention, the pot portion has an inclined portion that slopes so that the height of the upper edge of the side wall decreases as it moves forward. Therefore, water flowing from the rear of the basin towards the front forms a forward flow that descends towards the inside of the pot portion and flows towards the front wall of the pot portion within the recessed area. The descending forward flow impacts the front wall, creating a longitudinal swirling flow that rises along the front wall. Furthermore, the waste-receiving surface has a recess formed in the region from the front of the waste-receiving surface to the side portion of the pot portion. Water flowing from the rear of the basin towards the front is guided forward from the outside of the inclined portion. The washing water guided to the front side along the recess forms a flow from the recess at the front of the waste-receiving surface towards the pot portion and then towards the rear. At this time, the washing water flowing into the recess flows along the recess, extending forward from near the rear end and inside of the recess via the inclined portion. Therefore, according to the present invention, it is possible to prevent the rinsing water from flowing down from the side portion of the kettle to the inside of the kettle and colliding with the forward water flow in the inclined portion or the backward water flow from the concave portion of the front part of the dirt receiving surface towards the kettle, thus preventing water flow turbulence. Therefore, according to the present invention, it is possible to easily prevent the longitudinal swirling flow rising along the front wall and the backward water flow from the concave portion towards the kettle from interfering with each other, and to merge the longitudinal swirling flow rising along the front wall and the backward water flow from the concave portion towards the kettle, thereby more powerfully forming a surging flow from the front of the kettle towards the bottom, and improving dirt discharge performance.

[0025] In this invention, preferably, the lowest part of the concave portion of the dirt-receiving surface is positioned below the highest part of the inclined portion of the pot portion.

[0026] In this invention, the lowest part of the concave portion of the waste-receiving surface is positioned below the highest part of the inclined portion of the pot. Therefore, according to the invention, it is easy to make the height of the forward water flow that descends towards the inside of the pot and moves toward the front wall of the pot along the inclined portion different from the height of the rearward water flow that moves toward the pot and toward the rear from the concave portion. This can suppress the collision between the forward water flow from the inclined portion and the rearward water flow from the concave portion, and when these water flows merge, a powerful and easily formed surging flow from the front of the pot toward the bottom can be formed.

[0027] In this invention, preferably, the pot portion further includes a guide portion whose height is fixed at the upper edge of the side wall located further rearward than the rear end of the recess.

[0028] In this invention, the pot portion further includes a guide portion that fixes the height of the upper edge of the side wall further rearward than the rear end of the recess. Thus, according to the invention, the water flow from the rear of the pot portion toward the front is guided by the guide portion to be rectified into a forward flow further rearward than the rear end of the recess, preventing the forward flow from the inclined portion from becoming turbulent. After the forward flow from the inclined portion and the rearward flow from the recess merge, a more powerful surging flow is formed from the front of the pot portion toward the bottom.

[0029] In this invention, preferably, the uppermost part of the inclined portion of the upper edge of the pot is formed on a front side that is further forward than the rear wall of the rear side of the pot.

[0030] In this invention, the uppermost part of the inclined portion of the upper edge of the pot is formed further forward than the rear wall of the pot. Therefore, according to the invention, the water flow of washing water, which easily flows forward on the side of the pot beyond the rear wall, can be divided into a water flow descending along the inclined portion from the uppermost part of the inclined portion of the upper edge of the pot, and a water flow guided forward from the outside of the inclined portion of the upper edge of the pot, so that the water flow is less turbulent when it is divided at the side of the pot. Thus, the forward water flow, which flows towards the front wall of the pot while descending along the inclined portion, and the backward water flow, which flows towards the pot and backward from the concave portion, are less turbulent. According to the invention, when the longitudinal swirling flow rising along the front wall and the backward water flow from the concave portion towards the pot merge, water flow collision can be suppressed, and a more powerful impingement flow from the front of the pot towards the bottom can be formed.

[0031] In this invention, preferably, the maximum value of the lateral width of the recess is smaller than the maximum value of the lateral width of the pot when viewed from above.

[0032] In this invention, the maximum lateral width of the recess is smaller than the maximum lateral width of the pot when viewed from above. Therefore, according to the invention, the forward flow of water on the side of the pot can be easily formed into a forward flow that descends towards the inside of the pot through the inclined portion and flows towards the front wall of the pot. The washing water flows directly forward easily, thus preventing the backward flow from the recess towards the pot and towards the rear from becoming too large, and suppressing its collision with the forward flow from the inclined portion. This allows for a more powerful formation of a surging flow from the front of the pot towards the bottom, formed by the convergence of these water flows. Attached Figure Description

[0033] Figure 1 This is a perspective view of a water-washing toilet according to an embodiment of the present invention;

[0034] Figure 2 It is along Figure 1 A cross-sectional view observed along line II-II;

[0035] Figure 3 It is along Figure 1 A cross-sectional view observed along line III-III;

[0036] Figure 4 It is along Figure 2 A cross-sectional view observed along line IV-IV;

[0037] Figure 5 It is along Figure 3 A cross-sectional view observed along line V-V;

[0038] Figure 6 It is along Figure 3 A cross-sectional view observed along line VI-VI;

[0039] Figure 7 It is along Figure 3 A cross-sectional view observed along line VII-VII;

[0040] Figure 8 It is along Figure 3 A cross-sectional view observed along line VIII-VIII;

[0041] Figure 9 It is along Figure 3 A cross-sectional view observed along line IX-IX;

[0042] Figure 10 It is along Figure 3 A cross-sectional view observed along line X-X;

[0043] Figure 11 It is along Figure 3 A cross-sectional view observed along line XI-XI;

[0044] Figure 12 It is along Figure 3A cross-sectional view observed along line XII-XII;

[0045] Figure 13 It is along Figure 3 A cross-sectional view observed along line XIII-XIII;

[0046] Figure 14 Yes Figure 4 The cross-sectional view illustrates the water storage section of the pot and the flow of the washing water during the first half of the washing process.

[0047] Figure 15 This is a graph showing the simulation results of the kinetic energy of the washing water flowing into each area during the washing process in a water-washing toilet according to one embodiment of the present invention.

[0048] Figure 16 This is a graph showing the result of the number of particulate matter remaining during simulated washing in a water-washing toilet according to one embodiment of the present invention;

[0049] Figure 17 It is in Figure 4 The cross-sectional view illustrates the flow of the washing water during the latter half of the washing process. Detailed Implementation

[0050] Next, refer to Figures 1 to 4 The following describes a water-washing toilet according to an embodiment of the present invention.

[0051] like Figures 1 to 3 As shown, the flush toilet 1 is a flush toilet that uses flushing water supplied by a clean water source to clean and remove waste. The flush toilet 1 is a type of toilet that uses the flow of water created by the drop in water level within the basin to flush away waste. The flush toilet 1 includes a toilet body 2 and a water tank 4, which stores flushing water for cleaning the toilet body 2. The toilet body 2 is made of ceramic. The toilet body 2 has a basin 6 at the front side to receive waste. Furthermore, a common water passage 8 is formed at the upper rear of the basin 6, the upstream end of which connects to the water tank 4. Further, a drain pipe 10 for discharging waste is formed at the lower rear of the basin 6. It should be noted that the flush toilet 1 can be a so-called siphon-type flush toilet, which uses a siphon effect to suck in waste from the basin 6 and discharge it to the outside in one go through the drain pipe bend. Furthermore, in the following description of one embodiment of the present invention, the front side when viewed from the user's side (the user's side standing in front of the toilet 1 in order to use the toilet 1) will be referred to as the front side, the inside side when viewed from the user's side will be referred to as the rear side, the right side when viewed from the front of the toilet 1 will be referred to as the right side, and the left side when viewed from the front will be referred to as the left side.

[0052] A drain pipe 12 is connected to the lower part of the basin 6. The drain pipe 12 has an inlet pipe 12a connected to the bottom of the pot part (described later) of the basin 6, an ascending pipe 12b extending obliquely upward and backward from the inlet pipe 12a, and a descending pipe 12c descending from the ascending pipe 12b. The basin 6 and the drain pipe 12 are made of pottery and are integrally formed with the toilet body 2. The basin 6 is formed into an egg shape with a longitudinal width of 32cm to 40cm and a lateral width of 22cm to 30cm when viewed from above.

[0053] The aforementioned water tank 4 serves as the source of washing water and is equipped with a drain valve 14, which is opened and closed via an operating lever (not shown). It should be noted that the toilet 1 can be supplied with washing water via a pump or similar means, without relying on the water tank 4.

[0054] The basin portion 6 includes a basin-shaped waste receiving surface 16, an inner edge portion 18 formed above the waste receiving surface 16, and a reservoir portion 20 formed below the waste receiving surface 16, which forms a water storage portion 28 to maintain a water storage surface WO (21). The inner circumferential surface 18a of the inner edge portion 18 is described later. Figure 12 As shown, the shape extends inwards to prevent the swirling washing water, described later, from splashing outwards. The reservoir 20 is formed into a roughly triangular shape, closer to an egg shape (an elliptical shape with a pointed front), than the roughly triangular water storage surface W0, and has a longitudinal width of 200mm to 240mm in the front-to-back direction and a lateral width of 150mm to 190mm in the left-to-right direction when viewed from above. The water storage surface 21 of the reservoir 20 is roughly triangular, with a longitudinal width of 160mm to 180mm and a lateral width of 125mm to 145mm when viewed from above, and is larger (enlarged) than the water storage surface of existing flushing toilets.

[0055] When viewed from the front of the inner circumferential surface of the inner edge 18 of the basin 6, a first water outlet 22 is formed further forward than the central portion that is bisected in the front-back direction on the left. This first water outlet 22 is for discharging washing water. Further, when viewed from the front, a second water outlet 24 is formed further rearward than the central portion on the right. These first water outlets 22 and second water outlets 24 form a swirling flow in the same direction (counterclockwise). The common water passage 8 formed at the upper rear of the aforementioned bidet toilet 1 branches to the left and right after facing the front of the toilet bowl to supply washing water to either the first water outlet 22 or the second water outlet 24. It should be noted that there can be one or more water outlets for discharging washing water. Furthermore, by reversing the water discharge directions of the first water outlet 22 and the second water outlet 24, a clockwise swirling flow can be formed within the basin.

[0056] Next, as Figures 1 to 13 As shown, the soil receiving surface 16 is explained.

[0057] The waste receiving surface 16 has a recess 26, which is formed in the area from the front portion of the waste receiving surface 16 to the side portion of the pot portion 20. For example... Figure 4 As shown, the recess 26, viewed from above, is formed in a fan shape extending from the front of the dirt-receiving surface 16 toward the rear. The recess 26 has a portion that is further deepened relative to the surface surrounding the recess 26 of the dirt-receiving surface 16 (for example, if a curved surface is formed to match the surrounding shape, a portion of the originally convex curved surface becomes flat, or a flat surface is recessed downwards). The recess 26 forms a guide portion for the washing water that is lower than the surrounding dirt-receiving surface from the rear end portion 26a to the front of the dirt-receiving surface. Furthermore, the rear end portion 26a of the recess 26 is smoothly connected to the surrounding dirt-receiving surface 16. The rear end portion 26a is located further forward than the portion of the sidewalls 30 between the left and right sidewalls 30 of the pot portion 20 where the width in the left-right direction reaches its maximum. Furthermore, viewed from above, the rear end portion 26a is located further rearward than the front wall 32 of the pot portion 20, in the central region A2 (see below). Figure 2 ).

[0058] Since the folded portion of the curved surface of the recess 26 is difficult to represent in the attached drawings, therefore, in Figure 4 The area of ​​the recess 26 is hypothetically represented as the area inside the dotted line. Figure 5 In the cross-section shown, the recess 26 is formed in region B1 within the dirt-receiving surface 16. The outer end portion 26b of the recess 26 (both ends of region B1) forms a fold point that changes downward relative to the surrounding dirt-receiving surface 16. The bottom portion 26c of the recess 26 in region B1 is formed to be shallower.

[0059] exist Figure 6 In the cross-section shown, a recess 26 is formed in region B2 within the dirt-receiving surface 16. The outer ends 26b of the recess 26 (both ends of region B2) are folded downwards relative to the surrounding dirt-receiving surface 16. The width between the outer ends 26b in region B2 is greater than the width between the outer ends 26b in region B1. The bottom 26c of the recess 26 in region B2 is formed deeper. The height (depth) between the outer ends 26b and the bottom 26c in region B2 is greater (deeper) than the height (depth) between the outer ends 26b and the bottom 26c in region B1. Figure 6 The radius of curvature of the bottom 26c shown is greater than Figure 5 The radius of curvature of the bottom 26c is shown.

[0060] exist Figure 7In the cross-section shown, a recess 26 is formed in region B3 within the dirt-receiving surface 16. The outer ends 26b of the recess 26 (the two ends of region B3) form fold points that change downwards relative to the surrounding dirt-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. Figure 7 The radius of curvature of the bottom 26c shown is greater than Figure 6 The radius of curvature of the bottom 26c is shown.

[0061] exist Figure 8 In the cross-section shown, the recess 26 is formed in region B4 within the dirt-receiving surface 16. The outer ends 26b of the recess 26 (both ends of region B4) form fold points that change downwards relative to the surrounding dirt-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. Figure 8 The radius of curvature of the bottom 26c shown is greater than Figure 7 The radius of curvature of the bottom 26c is shown.

[0062] exist Figure 9 In the cross-section shown, a recess 26 is formed in region B5 within the dirt-receiving surface 16. The outer ends 26b of the recess 26 (the two ends of region B5) form fold points that change downwards relative to the surrounding dirt-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. Figure 9 In the cross-sectional view shown, the bottom 26c is the lowest part 26e of the recess 26 at its lowest position. The lowest part 26e of the recess 26 is located below the uppermost part 38a of the inclined portion 38 of the pot portion 20, which will be described later. Figure 9 The radius of curvature of the bottom 26c shown is greater than Figure 8 The radius of curvature of the bottom 26c is shown.

[0063] exist Figure 10In the cross-section shown, a recess 26 is formed in region B6 within the dirt-receiving surface 16. At this cross-sectional position, an inclined portion 38 of the upper edge 36 of the sidewall 30 is formed on the inner side of the recess 26. The recess 26 is recessed in such a way that a portion of the convex curved surface (the curved surface connecting the dirt-receiving surface 16 and the inclined portion 38) is flattened. The outer ends 26b of the recess 26 (both ends of region B6) form bends that change downwards relative to the surrounding dirt-receiving surface 16. The inner ends 26d of the recess 26 (the inner end of region B6) form bends that change further downwards from the recess 26 toward the inclined portion 38. The lateral width ratio between the left and right outer ends 26b of the recess 26 is... Figure 9 The lateral width between the left and right outer ends 26b in region B5 shown is large.

[0064] exist Figure 11 In the cross-section shown, a recess 26 is formed in region B7 within the dirt-receiving surface 16. An inclined portion 38 is formed on the inner side of the recess 26. The recess 26 is recessed in such a way that a portion of the protruding convex curved surface is flattened. The outer ends 26b of the recess 26 (both ends of region B7) form bends that change downwards relative to the surrounding dirt-receiving surface 16. The inner ends 26d of the recess 26 (the inner ends of region B7) form bends that change further downwards from the recess 26 towards the inclined portion 38. The width between the outer ends 26b and inner ends 26d in each region B7 is smaller than the width between the outer ends 26b and inner ends 26d in each region B6. The lateral width between the left and right outer ends 26b of the recess 26 is smaller than... Figure 10 The lateral width from the outer end 26b of region B6 on the right to the outer end 26b of region B6 on the left is large.

[0065] exist Figure 12 In the cross-section shown, a recess 26 is formed in region B8 within the dirt-receiving surface 16. An inclined portion 38 is formed on the inner side of the recess 26. The recess 26 is recessed in such a way that a portion of the protruding convex curved surface is flattened. The outer ends 26b of the recess 26 (both ends of region B8) form a fold point that changes downward relative to the surrounding dirt-receiving surface 16. The inner ends 26d of the recess 26 (the inner ends of region B8) form a fold point that changes further downward from the recess 26 toward the inclined portion 38. The width between the outer ends 26b and inner ends 26d in each region B8 is smaller than the width between the outer ends 26b and inner ends 26d in each region B7. The lateral width between the left and right outer ends 26b of the recess 26 is smaller than... Figure 11The lateral width from the outer end 26b of region B7 on the right to the outer end 26b of region B7 on the left is large. The lateral width between the outer ends 26b on both sides of region B8 is defined as the maximum lateral width W1 of the recess 26. For example... Figure 4 As shown, the maximum lateral width W1 of the recess 26 is smaller than the maximum lateral width W2 of the pot portion 20 when viewed from above. In the portion where the maximum lateral width W2 of the pot portion 20 is formed, a guide portion 40 is formed at the upper edge 36, but the recess 26 is not formed. Therefore, the swirling flow that circulates from the rear to the front is easily guided from the guide portion 40 to the inclined portion 38 at the portion where the maximum lateral width of the pot portion 20 is formed.

[0066] exist Figure 13 In the cross-section shown, there is no recess 26, but a guide portion 40 with an upper edge 36 is formed on the dirt receiving surface 16.

[0067] Next, through Figures 1 to 4 Let me explain the structure of the pot part 20 in detail.

[0068] The kettle part 20 has a water storage part 28 formed inside, with the water storage surface W0 indicated by a dotted line. The kettle part 20 includes a side wall 30 that stands vertically on the side side, a front wall 32 that stands vertically on the front side, a rear wall 34 that stands vertically on the rear side, an inclined part 38 that tilts the upper edge 36 of the side wall 30 in such a way that the height of the upper edge 36 of the side wall 30 decreases as it faces forward, and a guide part 40 that has a fixed height of the upper edge 36 of the side wall 30 located further rear than the rear end 26a of the recess 26.

[0069] The front wall 32 is formed so as to rise from the bottom 33 of the pot portion 20. It should be noted 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. As a result, once the washing water flowing down from the inclined portion 38 enters the water storage surface, it is easier to form a longitudinal swirling flow along the front wall 32. Furthermore, the longitudinal swirling water flow at this time is the water flow that rises from the bottom 33 along the front bottom corner 41 to the front wall 32, forming a compact longitudinal swirling flow that rises to the upper part of the front wall 32. In addition, if the angle of the front bottom corner 41 is small and the water flow facing forward hits the front bottom corner 41 from the bottom, it is easier to form a longitudinal swirling flow that rises along the front wall 32. Even if the water flow facing forward does not hit the bottom, a longitudinal swirling flow can be formed, but by hitting the bottom and rising along the front bottom corner 41, a longitudinal swirling flow can be formed more effectively.

[0070] like Figure 2 As shown, the inclined portion 38 extends from near the rear end 26a of the recess 26 and its inner side faces forward. The inclined portion 38 is also difficult to show in the drawings due to the folded portion of the curved surface; therefore, in... Figures 2 to 4 In the diagram, the region of the inclined portion 38 is imaginarily represented as the region inside the dashed line. The inclined portion 38 extends forward from the region on the side of the middle region A2, one of the regions that divide the pot portion 20 into three parts in the front-rear direction (front region A1, middle region A2, and rear region A3). It should be noted that the rear end portion 26a of the recess 26 is also located in the region on the side of the middle region A2. Furthermore, as... Figure 11 and Figure 12 As shown, the inclined portion 38 forms a curved corner in the longitudinal section, and a canopy-shaped flow path is formed on its upper side. The uppermost part 38a of the inclined portion 38 is formed on the front side of the rear wall 34, which is further forward than the rear side of the pot portion 20. The uppermost part 38a of the inclined portion 38 serves as a bend point from the guide portion 40 downwards, making it easy to form the beginning of the washing water flowing inwards and downwards. The inclined portion 38 forms an inclination angle ranging from 2 degrees to 35 degrees downwards relative to the guide portion 40. The inclined portion 38 forms a surface that is more inclined downwards than the guide portion 40. The lower end of the inclined portion 38 is connected to a point slightly downwards relative to the top of the front wall 32. If the flow of the washing water that has flowed into the inclined portion 38 to the outer recess 26 is suppressed, it is less likely to interfere with the washing water flowing through the recess 26. Therefore, the washing water flowing from the inclined portion 38 to the inner side of the pot portion 20 is less likely to interfere with the washing water flowing through the recess 26 to the front side of the dirt receiving surface 16, and can form two water flows more effectively and powerfully.

[0071] The guide portion 40 extends approximately horizontally from the rear end of the inclined portion 38 toward the rear wall 34. The curved fold of the guide portion 40 is difficult to show in the accompanying drawings, therefore... Figure 2 and Figure 3 In the diagram, the area of ​​the guide section 40 is hypothetically represented as the area inside the dashed line.

[0072] Next, refer to Figure 2 and Figure 4 The flow of washing water in a water-washing toilet according to one embodiment of the present invention will be described.

[0073] First, if the user operates the lever (not shown) of the water tank 4, the drain valve 14 opens, and washing water is supplied from the water tank 4 to the common water passage 8. The washing water is discharged from the first outlet 22 and the second outlet 24, forming a swirling flow around the pot 20 on the dirt receiving surface 16, as indicated by arrow F0. At this time, in the area on the side of the pot 20, the flow direction of the washing water tends to converge forward compared to the area in front of or behind the pot.

[0074] At this time, as shown by arrow F1, the water flowing from the rear of the basin towards the front, passing through the inner side of the pot 20, first flows in a roughly horizontal straight line towards the front along the guide section 40, and then easily forms a downward flow towards the inner side of the pot 20 through the inclined section 38. As shown by arrow F2 (see...) Figure 2 The main stream of water flowing forward toward the front wall 32 of the pot 20 flows into the water from the water storage surface 21 and impacts the front wall 32 from the bottom 33 of the pot 20, thereby forming a longitudinal swirling flow that rises along the front wall.

[0075] Furthermore, as indicated by arrow F3, the water flow in the area on the outer side of the side of the pot 20, flowing from the rear of the basin towards the front, is easily guided forward from the outer side of the inclined portion 38, forming a water flow guided forward along the recess 26. At this time, if the washing water that has flowed into the recess 26 is guided forward along the recess 26 and then flows down to the inclined portion 38 or the pot 20, it can collide with the forward water flow at the inclined portion 38 or the rearward water flow from the recess 26 towards the pot 20 (described later), thus suppressing the turbulence of these water flows.

[0076] As indicated by arrow F4, a portion of the washing water guided along the recess 26 to the front side forms a water flow from the recess 26 at the front of the dirt receiving surface 16 toward the pot 20 and toward the rear. Since the recess 26 has a more recessed portion than the dirt receiving surface 16, it is easy to form a water flow from the recess 26 toward the pot 20 and toward the rear.

[0077] As shown by arrow F5, the longitudinal swirling flow rising along the front wall 32 (water flow indicated by arrow F2) merges with the rearward water flow from the recess 26 towards the pot 20 (water flow indicated by arrow F4), which can more forcefully form a surging flow from the front of the pot 20 towards the bottom. Thus, the surging flow from the front of the pot 20 towards the bottom is strengthened by the merged water flow, further improving the performance of waste removal. It should be noted that it is also possible to form a longitudinal swirling flow rising along the front wall 32 of the pot 20 without impacting the bottom 33. Furthermore, such a surging flow can improve the discharge capacity of particulate waste or maintain the discharge capacity of particulate waste at a higher level. Waste flushed into the water along with the washing water is discharged downstream through the drain bend pipe 12. Such a surging flow, as shown by arrow F5, is easily formed during washing; however, as described later, in the latter half of the washing period E3 (refer to…),… Figure 15 )middle, Figure 15 The proportion of the flow rate of the washing water flowing into the front area (third area D3 and fourth area D4) of the water storage surface 21 of the water storage section 28 in the kettle section 20 and the water storage section 28 is easily increased relative to the "total inflow flow rate of the washing water into the water storage section", thus making it easier to form the ramming flow shown by arrow F5 as described above.

[0078] Furthermore, the swirling flow of the rinsing water is strong in its circumferential direction, and when the swirling flow passes in front of the recess 26 of the dirt receiving surface 16 ( Figure 15 During the first half of the washing process (E1) shown, the depth of the recess 26 at the location through which the water passes is relatively shallow. Therefore, it is possible to suppress the accumulation of washing water due to the recess 26. When the swirling flow of the washing water is weak, the swirling flow passes behind the recess 26 of the dirt receiving surface 16. Figure 15 During the second half of the washing process (E3), the deep recess 26 at the location through which the washing water passes allows the washing water to easily accumulate. This makes it easier to create a pressurized flow of waste flowing down from the recess 26 on the front side of the waste receiving surface 16 toward the water storage section.

[0079] Next, through Figure 14 Let me explain the water storage section in detail.

[0080] The pot section 20 forms a water storage surface 21 (in Figure 3 The water storage surface (W0), indicated by the dashed line, serves as the water storage section. The water storage surface 21 is divided into four regions by a front-to-back centerline C1 and a right-to-right centerline C2. The front-to-back centerline C1 divides the water storage surface 21 in the front-to-back direction into a front region and a rear region, while the left-to-right centerline C2 divides the water storage surface 21 in the left-to-right direction into a right region and a left region. The water storage surface 21 has a front region on the front side and a rear region on the rear side after being divided in the front-to-back direction. In the front region of the water storage surface 21, the depth from the water surface to the bottom is shallower than in the rear region, allowing the upward flow of water in a longitudinal swirling motion to effectively flush out floating debris. The front-to-back centerline C1 is a line extending in the left-to-right direction at the midpoint between the front wall 32 and the rear wall 34 of the water storage surface 21. The left-right center line C2 is a line extending in the front-back direction at the midpoint between the right and left sidewalls 30 of the water storage surface 21. The water storage surface 21 is divided into four regions by the front-back center line C1 and the left-right center line C2: first region D1, second region D2, third region D3, and fourth region D4. In this embodiment, the water storage portion is defined by the water storage surface, but the water storage portion can also be defined by the pot portion 20. In this case, the pot portion 20 can be defined into four regions by the front-back center line C1, which divides the pot portion 20 into a front region and a rear region in the front-back direction, and the left-right center line C2, which divides the pot portion 20 into a right region and a left region in the left-right direction.

[0081] Next, refer to Figures 14 to 16 The flow of washing water in a water-washing toilet according to an embodiment of the present invention will be described.

[0082] exist Figure 15 In this embodiment of the water-washing toilet, the kinetic energy, i.e., the inflow flow rate, of the washing water flowing into each region (first region D1, second region D2, third region D3, and fourth region D4) of the water storage surface 21 of the water storage section 28 during washing is shown through simulation results. Figure 15 In the diagram, the vertical axis represents the change in the kinetic energy (J) of the washing water, and the horizontal axis represents the elapsed time. On the horizontal axis, the start of the operation of the control lever is taken as the starting point of time 0 (S). The washing period for the washing water used to clean the soiled surface flowing into the water storage section 28 is from time T0 (S) to time T1 (S). At time T0, the washing water begins to flow into the water storage surface 21, and at time T1, the flow of washing water that aids in cleaning to the water storage surface 21 of the water storage section 28 has essentially ended. When the flow rate of washing water into the water storage surface 21 decreases to a level that is substantially no longer helpful for cleaning, the flow of washing water that aids in cleaning to the water storage surface 21 is considered to have ended (time T1). It should be noted that the washing period is divided into three equal parts, and the first half of the washing period E1, the middle half of the washing period E2, and the second half of the washing period E3 are defined. It should be noted that since the moment when the washing water begins to flow into the water storage surface 21 is approximately the same as the moment when the water is discharged from the outlet, the period from the moment when the water is discharged from the outlet to the moment when the water is discharged from the outlet T0(S) to the moment when the water is discharged from the outlet T1(S) can be set as the period for discharging the washing water during the washing process.

[0083] During the first half of the washing process (E1) after the washing begins, the proportion of the inflow rate of the washing water into the rear region (first region D1 and second region D2) of the water storage section 28 (water storage surface 21) as indicated by arrow F11 is greater than the proportion of the inflow rate of the washing water into the front region (third region D3 and fourth region D4) of the water storage section 28 (water storage surface 21) as indicated by arrow F12, relative to the total inflow rate of the washing water into the water storage section 28.

[0084] During the second half of the washing process, E3, the proportion of the inflow rate of the washing water into the front region (third region D3 and fourth region D4) of the water storage section 28 (water storage surface 21) as indicated by arrow F13 is greater than the proportion of the inflow rate of the washing water into the rear region (first region D1 and second region D2) of the water storage section 28 (water storage surface 21) as indicated by arrow F14 is greater than the proportion of the inflow rate of the washing water into the rear region (first region D1 and second region D2) of the water storage section 28 (water storage surface 21) as indicated by arrow F14 is greater than the proportion of the inflow rate of the washing water into the total inflow rate of the water storage section 28.

[0085] Furthermore, in the second half of the washing period E3, the proportion of the inflow rate of the washing water into the front area (third area D3 and fourth area D4) of the water storage section 28 (water storage surface 21), as indicated by arrow F13, relative to the total inflow rate of washing water into the water storage section 28 is greater than that in the first half of the washing period E1, as indicated by arrow F12, relative to the total inflow rate of washing water into the water storage section 28 (water storage surface 21). In this way, by increasing the proportion of the inflow rate of washing water into the front area of ​​the water storage section 28 (water storage surface 21) in the second half of the washing period E3 relative to the total inflow rate of washing water into the water storage section 28, the particulate matter removal capacity in the second half of the washing period E3 can be improved, or the particulate matter removal capacity can be maintained at a higher level even in the second half of the washing period E3.

[0086] During the first half of the washing process, E1, the proportion of the inflow rate of washing water into the front region (third region D3 and fourth region D4) of the water storage section 28 (water storage surface 21) relative to the total inflow rate of washing water into the water storage section 28 decreases. Furthermore, during the second half of the washing process, E3, the proportion of the inflow rate of washing water into the front region (third region D3 and fourth region D4) of the water storage section 28 (water storage surface 21) relative to the total inflow rate of washing water into the water storage section 28 increases. Moreover, it can be confirmed that, compared to the proportion of the inflow rate of washing water into the front region (third region D3 and fourth region D4) of the water storage section 28 (water storage surface 21) relative to the total inflow rate of washing water into the water storage section 28 during the first half of the washing process, the proportion of the inflow rate into the front region (third region D3 and fourth region D4) of the water storage surface 21 during the second half of the washing process increases.

[0087] exist Figure 16 The results shown in the diagram illustrate the remaining amount of particulate matter discharged during a simulated washing process in the water-washing toilet of this embodiment. Figure 16 In the diagram, the vertical axis represents the remaining number of particulate contaminants discharged, and the horizontal axis represents time (seconds). In this simulation, particulate contaminants are defined as tiny particles. Immediately after the washing process begins, the remaining number of particulate contaminants discharged is 2500. The washing period during which the washing water is discharged is from time T0 (seconds) to time T1 (seconds), and... Figure 15 Similarly, the washing period is divided into three equal parts, and the first half of the washing period is defined as E1, the middle half of the washing period as E2, and the second half of the washing period as E3.

[0088] As described above, it is known that by increasing the proportion of the inflow rate of the washing water into the front area of ​​the water storage section 28 (water storage surface 21) during the second half of the washing period E3 to the total inflow rate of the washing water into the water storage section 28, the discharge capacity of particulate matter during the second half of the washing period E3 can be improved, or the discharge capacity of particulate matter can be maintained at a high level during the second half of the washing period E3. During the second half of the washing period, particulate matter is reduced and discharged to the point of almost disappearing. Furthermore, the discharge capacity of dirt during the second half of the washing period can also be improved, not limited to particulate matter.

[0089] Furthermore, in the water-washing toilet of this embodiment, during the first half of the washing period E1 (or the middle of the washing period E2), the mainstream of the washing water formed on the waste receiving surface 16, as shown by arrow F15, flows into either the right region (second region D2 and third region D3) or the left region (first region D1 and fourth region D4), which is located downstream of the swirling direction of the washing water when viewed from the front of the waste receiving surface 16. For example, in this embodiment, the front region (third region D3) and / or the rear region (second region D2) of either the right region (second region D2 and third region D3) flows into the rear region (second region D2).

[0090] Therefore, as Figure 17 As shown, in the latter half of the washing process, E3, the swirling of the washing water weakens, and the inflow area of ​​the main stream of washing water into the water storage section 28 (water storage surface 21) changes in a manner that shifts upstream in the swirling direction (as indicated by arrow F10). As shown by arrow F16, the main stream of washing water can easily flow into the front region (third region D3 and fourth region D4) of the water storage section 28 (water storage surface 21). Therefore, it can be understood that the ability to remove particulate matter in the latter half of the washing process, E3, can be improved, or that the ability to remove particulate matter can be maintained at a high level even in the latter half of the washing process, thereby reducing and removing residual particulate matter in the latter half of the washing process. Furthermore, the ability to remove contaminants in the latter half of the washing process can be improved, not only for particulate matter.

[0091] In the latter half of the washing period E3, the proportion of the inflow rate of the washing water into the water storage section 28 (water surface 21) to the front region (fourth region D4 or third region D3) of either the right-side region (second region D2 and third region D3) or the left-side region (first region D1 and fourth region D4) relative to the total inflow rate of washing water into the water storage section 28 is greater than the proportion of the inflow rate of washing water into the other three regions relative to the total inflow rate of washing water into the water storage section 28. For example, in Figure 15 and Figure 17In the second half of the washing process, E3, the proportion of the inflow rate of the washing water into the right-hand region (second region D2 and third region D3) and the left-hand region (first region D1 and fourth region D4) of the water storage section 28 (water surface 21) relative to the total inflow rate of the washing water into the water storage section 28 (the proportion of inflow rate relative to the total inflow rate shown by arrow F17) is greater than the proportion of the inflow rate of the washing water into the other three regions (first region D1, second region D2, and third region D3) relative to the total inflow rate of the washing water into the water storage section 28 (the proportion of inflow rate relative to the total inflow rate shown by arrows F18, F19, and F20). For example, the inflow rate of the washing water is calculated as the average value in the second half of the washing process, E3. Particulate matter and dirt flushed into the water along with the washing water are discharged downstream through the drain bend pipe 12, and the washing process ends.

[0092] According to the above-described embodiment of the present invention, a water-washing toilet 1 forms a flow of washing water on the waste receiving surface 16 in such a manner that, during the washing period when the washing water for washing the waste receiving surface 16 flows into the water storage section 28 (water storage surface 21), the proportion of the inflow rate of washing water into the front area of ​​the water storage section 28 (water storage surface 21) in the second half of the washing period E3 relative to the "total inflow rate of washing water into the water storage section 28" is greater than the proportion of the inflow rate of washing water into the front area of ​​the water storage section 28 (water storage surface 21) in the first half of the washing period E1 relative to the "total inflow rate of washing water into the water storage section 28". This increases the proportion of the inflow rate of washing water into the front area of ​​the water storage section 28 (water storage surface 21) in the second half of the washing period E3, improves the discharge capacity of particulate matter in the second half of the washing period E3, and suppresses the situation where particulate matter remains on the water storage surface 21 in the second half of the washing period E3. This improves the ability to remove dirt from E3 during the second half of the washing process.

[0093] Furthermore, according to the water-washing toilet 1 of this embodiment, during the first half of the washing period E1, the main flow of washing water formed on the waste receiving surface 16 flows into the front and rear regions of either the right or left region along the swirling direction of the washing water on the waste receiving surface 16. Therefore, during the second half of the washing period E3, when the swirling of the washing water weakens and the main flow of washing water into the water storage section 28 (water storage surface 21) changes in a manner that shifts upstream in the swirling direction, the main flow of washing water can easily flow into the front region of the aforementioned water storage surface 21.

[0094] Furthermore, in the flush toilet 1 according to this embodiment, the waste receiving surface 16 of the basin 6 has a recess 26, which is formed in a fan shape extending from the front of the waste receiving surface 16 toward the rear when viewed from above. As a result, when the momentum of the swirling flow of the washing water is strong and the swirling flow passes in front of the recess 26 of the waste receiving surface 16, the accumulation of washing water due to the recess 26 can be suppressed. When the momentum of the swirling flow of the washing water weakens and the swirling flow passes behind the recess 26 of the waste receiving surface 16, the washing water can easily accumulate due to the recess 26, and a turbulent flow of waste flowing down from the recess 26 in front of the waste receiving surface 16 to the water storage section 28 (water storage surface 21) can be easily formed.

[0095] Furthermore, according to the water-washing toilet 1 of this embodiment, the proportion of the inflow rate of the washing water into the front region of either the right or left region of the water storage section 28 (water storage surface 21) during the second half of the washing period E3, relative to the total inflow rate of the washing water into the water storage section 28, is greater than the proportion of the inflow rate of the washing water into the other three regions relative to the total inflow rate of the washing water into the water storage section 28. Therefore, during the second half of the washing period E3, the inflow of washing water into the front region of either the right or left region of the four regions can be enhanced, further improving the discharge capacity of particulate matter during the second half of the washing period E3, and further improving the discharge capacity of waste during the second half of the washing period E3.

[0096] Furthermore, according to the above-described embodiment of the water-washing toilet 1 of the present invention, the pot portion 20 is provided with an inclined portion 38, which is inclined in such a way that the height of the upper edge portion 36 of the side wall 30 of the pot portion 20 decreases as it moves forward. As a result, the water flowing from the rear of the basin portion 6 toward the front side forms a forward water flow inside the recess 26, which flows toward the front wall 32 of the pot portion 20 while descending toward the inside of the pot portion 20 through the inclined portion 38. As the descending forward water flow impacts the front wall 32, a longitudinal swirling flow that rises along the front wall 32 is formed. Furthermore, the waste receiving surface 16 has a recess 26 that extends downward from the front of the waste receiving surface 16 to the side portion of the aforementioned pot portion 20. Water flowing from the rear of the basin portion 6 towards the front is guided forward from the outside of the inclined portion 38. The washing water guided to the front along the recess 26 forms a water flow from the recess 26 at the front of the waste receiving surface 16 towards the pot portion 20 and then towards the rear. At this time, the inclined portion 38 extends forward from near the rear end 26a of the recess 26 and from the inside, so the water flow of washing water flowing into the recess 26 flows along the recess 26. As a result, it is possible to prevent the washing water from flowing down from the side portion of the pot portion 20 towards the inside of the pot portion 20 and colliding with the forward water flow in the inclined portion 38 or the rearward water flow from the recess 26 at the front of the waste receiving surface 16 towards the pot portion 20, thus preventing water flow turbulence. With this structure, it is easy to form a longitudinal swirling flow rising along the front wall 32 and a rearward water flow from the recess 26 toward the pot 20 without interfering with each other. It can more forcefully form a surging flow from the front of the pot 20 toward the bottom side, which is formed by the merging of the longitudinal swirling flow rising along the front wall 32 and the rearward water flow from the recess 26 toward the pot 20, thereby improving the performance of waste discharge.

[0097] Furthermore, in the flush toilet 1 according to this embodiment, the lowermost part 26e of the recess 26 of the waste receiving surface 16 is positioned below the uppermost part 38a of the inclined portion 38 of the pot portion 20. This makes it easier to differentiate the height of the forward water flow that descends towards the inside of the pot portion 20 and flows towards the front wall 32 of the pot portion 20 through the inclined portion 38, and the height of the backward water flow that flows from the recess 26 towards the pot portion 20 and backward. This helps to suppress the collision between the forward water flow from the inclined portion 38 and the backward water flow from the recess 26, and allows for a stronger formation of a surging flow from the front of the pot portion 20 towards the bottom, formed by the convergence of these water flows.

[0098] Furthermore, according to the water-washing toilet 1 of this embodiment, the pot portion 20 also has a guide portion 40 whose height is fixed at the upper edge 36 of the side wall 30 located further rearward than the rear end portion 26a of the recess 26. As a result, the water flow flowing from the rear of the basin portion 6 toward the front can be guided by the guide portion 40 to be rectified into a water flow toward the front at a location further rearward than the rear end portion 26a of the recess 26. This makes the forward water flow from the inclined portion 38 less turbulent and allows for a stronger formation of a surging flow from the front of the pot portion 20 toward the bottom, which is formed by the merging of the forward water flow from the inclined portion 38 and the rearward water flow from the recess 26.

[0099] 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 pot 20 is formed further forward than the rear wall 34 on the rear side of the pot 20. This allows the water flow, which easily flows forward at the side of the pot 20 further forward than the rear wall 34, to be divided into a water flow descending along the inclined portion 38 from the uppermost part 38a of the inclined portion 38 of the upper edge 36 of the pot 20, and a water flow guided forward from the outside of the inclined portion 38 of the upper edge 36 of the pot 20. This prevents the water flow from becoming turbulent when it is divided at the side of the pot 20. Consequently, the forward water flow, which descends towards the inside of the pot 20 and flows towards the front wall of the pot 20 through the inclined portion 38, and the backward water flow, which flows towards the pot 20 from the recess 26 and backward, are less likely to become turbulent. According to this structure, when the longitudinal swirling flow rising along the front wall 32 and the rearward flow from the recess 26 toward the pot 20 merge, the water flow collision can be suppressed, and a ramming flow from the front of the pot 20 toward the bottom can be formed more forcefully.

[0100] Furthermore, in the water-washing toilet 1 according to this embodiment, the maximum value W1 of the lateral width of the recess 26 is smaller than the maximum value W2 of the lateral width of the pot 20 when viewed from above. As a result, the forward water flow on the side of the pot can be easily formed into a forward water flow that flows towards the front wall 32 of the pot 20 while descending towards the inside of the pot 20 through the inclined portion 38. The washing water can easily flow directly forward, so that the backward water flow from the recess 26 towards the pot 20 and towards the rear is not too large, and it can suppress the collision with the forward water flow from the inclined portion 38. This allows for a stronger surging flow from the front of the pot 20 towards the bottom formed by the merging of these water flows.

Claims

1. A water-washing toilet that cleans and discharges waste using washing water supplied by a washing water source, and has a basin for receiving waste. The basin features: A basin-shaped surface for receiving waste; The inner edge is formed above the surface where the waste is received; A water outlet, formed on the aforementioned inner edge, is used to dispense washing water; and The pot section is formed below the aforementioned waste-receiving surface, and a water-retaining surface is formed inside it. The aforementioned water outlet includes: a first water outlet, which is formed on either the left or right side of the front region of the waste receiving surface of the basin; and a second water outlet, which is formed on either the left or right side of the rear region of the waste receiving surface of the basin. The aforementioned basin portion has a recessed portion on its waste-receiving surface, which is formed in a fan shape that extends from the front of the waste-receiving surface toward the rear when viewed from above. The aforementioned water storage surface is divided into a front region and a rear region by a center line in the front-rear direction. This center line divides the water storage surface in two in the front-rear direction when viewed from above. During the washing process in which the washing water used to clean the aforementioned dirt-receiving surface flows into the aforementioned water storage surface, the proportion of the inflow rate of the washing water into the aforementioned front area of ​​the aforementioned water storage surface in the latter half of the washing process relative to the total inflow rate of the washing water into the aforementioned water storage surface is greater than the proportion of the inflow rate of the washing water swirling on the aforementioned dirt-receiving surface of the aforementioned basin into the aforementioned front area of ​​the aforementioned water storage surface in the former half of the washing process relative to the total inflow rate of the washing water into the aforementioned water storage surface.

2. The water-washing toilet according to claim 1, wherein, The aforementioned water storage surface is divided into four regions by a front-to-back centerline and a left-to-right centerline. The front-to-back centerline divides the water storage surface into a front region and a rear region in a top-down view, and the left-to-right centerline divides the water storage surface into a right region and a left region in a top-down view. During the first half of the washing process, the main stream of washing water formed on the contaminant receiving surface flows into either the front region or the rear region of the right region and the left region, which are located downstream of the swirling direction of the washing water when viewed from the front of the contaminant receiving surface.

3. The water-washing toilet according to claim 1 or 2, wherein, The aforementioned water storage surface is divided into four regions by a front-to-back centerline and a left-to-right centerline. The front-to-back centerline divides the water storage surface into a front region and a rear region in a top-down view, and the left-to-right centerline divides the water storage surface into a right region and a left region in a top-down view. The proportion of the inflow of the washing water into the front area of ​​either the right or left area during the second half of the washing period is greater than the proportion of the inflow of the washing water into the other three areas relative to the total inflow of the washing water into the storage surface.

4. The water-washing toilet according to any one of claims 1 to 3, wherein, The depth of the aforementioned recess is formed such that it increases from the front part of the aforementioned dirt-receiving surface toward the rear side.

5. The water-washing toilet according to any one of claims 1 to 4, wherein, The aforementioned recess extends from the front of the aforementioned dirt-receiving surface to the side of the aforementioned pot portion, and the recess on the side of the pot portion is formed in a flat manner.

6. The water-washing toilet according to claim 1, wherein, The aforementioned pot part has an inclined portion, which is inclined in such a way that the height of the upper edge of its side wall decreases as it faces forward. The inclined portion extends forward from near the rear end of the recess.

7. The water-washing toilet according to any one of claims 1 to 6, wherein, The aforementioned pot part also has a guide portion whose height is fixed at the upper edge of the side wall of the pot part, located further rearward than the rear end of the aforementioned recess.

Images