Flushing toilet

Abstract

The invention relates to a flush toilet having a bowl portion including a pot-shaped portion and a drain trap line, the pot-shaped portion having a bottom wall formed above and in front of an inlet of the drain trap line, a side wall formed to surround a periphery of the bottom wall, and a joint portion joining an outer edge of the bottom wall and a lower edge of the side wall, the bottom wall of the pot-shaped portion having a slope portion and guide portions formed on left and right outer sides of the slope portion and guiding cleaning water or excrement toward the inlet of the drain trap line from the front, the slope portion being formed so that, when viewed in a side cross-section, the entire slope portion is formed convexly upward while being inclined downward toward the inlet of the drain trap line from the front.

Description

Technical Field

[0001] This invention relates to a flush toilet, and more particularly to a flush toilet that uses flushing water to clean and discharge waste. Background Technology

[0002] Previously, as a flush toilet that uses washing water to clean and discharge waste, such as the one described in Japanese Patent Application Publication No. 2015-67954 (Patent Document 1), it is known that the toilet body has a basin and an inlet connected to a drain bend pipe below the basin.

[0003] In addition, in such existing flush toilets, the basin of the toilet body has: a basin-shaped waste receiving surface; and a pot-shaped part provided below the waste receiving surface.

[0004] Furthermore, above the drain bend pipe, a jug-shaped section forms a water collection area that accumulates a predetermined amount of water. In addition, the bottom surface of the jug-shaped section forming this water collection area forms a flat surface that slopes downward toward the inlet of the drain bend pipe.

[0005] Therefore, when the cleaning water flowing into the pot-shaped part from the dirt receiving surface comes into contact with the flat bottom surface of the pot-shaped part, a water flow that swirls in the longitudinal direction is formed in the water accumulation part (hereinafter "longitudinal swirling flow"), and at the same time, the cleaning water in the pot-shaped part is guided to the inlet of the drain bend pipe.

[0006] In particular, in the so-called "direct flush toilet" method, which flushes away waste by the flow of water generated by the drop of water in the basin, the longitudinal swirling flow in the pot-shaped part acts on the waste that has spread to the inlet of the drain bend, and the water pressure applied from above by the cleaning water ejected from the inner edge of the basin makes it possible to force the waste into the drain bend.

[0007] However, in the existing flush toilet described in the aforementioned Patent Document 1, in order to form a longitudinal swirling flow in the water accumulation section of the pot-shaped part of the toilet body, it is necessary to design the size of the water accumulation area (such as the planar cross-sectional area of ​​the water accumulation area) to be relatively small.

[0008] However, if the size of the water accumulation area in the water accumulation section is designed to be smaller than the existing size, the surface area of ​​the dirt receiving surface in the basin section or the area outside the water accumulation section in the pot-shaped section will increase accordingly, thus creating a problem that the area where dirt adheres will also increase.

[0009] On the other hand, if the size of the water accumulation area in the water accumulation section is designed to be larger than the existing one, the flow of cleaning water in the water accumulation section will be difficult to concentrate towards the center of the water accumulation section, thus making it difficult to collect dirt.

[0010] As a result, the area where dirt floats increases due to the spread of dirt in the water accumulation section. This creates a gap between the dirt and the drain bend, so the water pressure of the cleaning water cannot effectively act on the dirt, resulting in the so-called "pressure relief phenomenon" and causing a decrease in the performance of dirt discharge. Summary of the Invention

[0011] Therefore, the present invention is made to solve the problems of the prior art. The technical problem to be solved is to provide a flush toilet that, while ensuring a relatively large overall water accumulation area in the water accumulation part, can also inhibit the adhesion of dirt to the basin part (especially the pot-shaped part), thereby improving both cleaning performance and dirt discharge performance.

[0012] To address the aforementioned issues, the present invention provides a flush toilet that flushes and removes waste using cleaning water. It is characterized by comprising: a basin having a basin-shaped waste-receiving surface, an inner edge formed above the waste-receiving surface, and a pitcher-shaped portion located below the waste-receiving surface and forming a water collection area with accumulated water; a discharge portion located in the inner edge, discharging cleaning water into the basin; and a drain bend pipe having an inlet connected to the lower part of the pitcher-shaped portion for discharging waste from the basin. The pitcher-shaped portion includes: a bottom wall formed at the inlet of the drain bend pipe. The bottom wall of the pot-shaped portion includes: an inclined portion formed over a left-right span with respect to its left-right central axis; and a guide portion formed on the left-right outer side of the inclined portion, which guides cleaning water or dirt from the front toward the inlet of the drain bend. When viewed in cross section from the side, the inclined portion is formed as a whole upward convex shape, while simultaneously inclined downward from the front toward the inlet of the drain bend.

[0013] In this invention, the cleaning water that is discharged from the water outlet into the basin flows into the pot-shaped part from the dirt receiving surface.

[0014] At this time, the cleaning water or dirt in the pot-shaped part is guided by the guides on the left and right outer sides of the inclined part formed on the bottom wall of the pot-shaped part, so as to concentrate it towards the inclined part on the left and right center side, and then guided towards the inlet of the drain bend pipe.

[0015] In addition, when viewed in cross-section from the side, the inclined portion of the bottom wall of the pot-shaped part is formed in a convex shape that is convex upward as a whole, while it is inclined downward from the front toward the inlet of the drain bend pipe, so that a portion of the cleaning water flowing along the inclined portion can be separated.

[0016] This increases the water pressure of the cleaning water, which contains dirt concentrated in the inclined section of the bottom wall of the pot-shaped part, and guides the cleaning water and dirt towards the central side of the inlet of the drain bend pipe.

[0017] Therefore, at the inlet of the drain bend, the pressure of the cleaning water containing dirt can be increased, thus improving the performance of dirt discharge.

[0018] In this invention, it is preferred that, when viewed in cross-section from the front, the guide portion is formed in a convex shape facing upwards, and on the other hand, when viewed in cross-section from the front, the inclined portion is formed in a concave shape from the lower end of the left and right inner sides of the guide portion facing downwards.

[0019] In this invention, when the bottom wall of the pot-shaped part is viewed in cross section from the front, the guide portion is formed in a convex shape upwards, while the inclined portion is formed in a concave shape downwards from the lower ends of the left and right inner sides of the guide portion. Therefore, the convex portions on the left and right outer sides of the inclined portion prevent the washing water that flows over the convex guide portion into the concave inclined portion from flowing out of the inclined portion again.

[0020] Thus, the cleaning water is maintained in the concave inclined section, and the cleaning water and dirt can be guided from the inlet of the drain bend to the center of the flow path section in the drain bend.

[0021] This increases the water pressure of the cleaning water, which contains dirt concentrated in the inclined portion of the bottom wall of the pot-shaped part, thereby improving the dirt discharge performance.

[0022] In this invention, it is preferable that the inclined portion is configured such that, when viewed in cross-section from the front, the amount of concavity in the vertical direction from its upper end to its lowest bottom surface increases with the inlet side of the drainage bend pipe facing rearward.

[0023] In this invention, when the inclined portion of the bottom wall of the pot-shaped part is viewed in cross section from the front, the amount of concavity in the vertical direction from the upper end of the inclined portion to the lowest bottom surface is set to increase along with the inlet side of the drain bend pipe facing the rear. Therefore, just before the cleaning water in the inclined portion is about to flow into the inlet of the drain bend pipe, the convex guide portion that crosses the left and right outer sides of the inclined portion can be suppressed.

[0024] This increases the water pressure of the cleaning water flowing into the inlet of the drain bend, effectively guiding the cleaning water and waste from the inlet of the drain bend towards the center of the flow path cross-section within the drain bend, thus improving the waste discharge performance.

[0025] In this invention, it is preferable that the inclined portion is configured such that, when viewed from above, its width in the left-right direction increases with the inlet side of the drainage bend pipe facing backward.

[0026] In this invention, when the inclined portion of the bottom wall of the pot-shaped part is viewed from above, its width in the left and right directions is set to increase along with the inlet side of the drain bend pipe facing backward. Therefore, when the cleaning water flows into the inlet of the drain bend pipe from the inclined portion, after guiding the cleaning water and dirt to a larger range of the inlet of the drain bend pipe, it can be guided to the central side of the flow path cross section within the drain bend pipe.

[0027] This increases the water pressure of the cleaning water when waste is discharged from the kettle-shaped section into the drain bend pipe, thereby improving the waste discharge performance.

[0028] In this invention, it is preferable that the bottom wall of the pot-shaped portion further has a rear bottom surface protruding forward from the rear side of the water accumulation portion, the rear bottom surface being configured to guide the cleaning water from the rear side inside the pot-shaped portion forward.

[0029] In this invention, the cleaning water flowing into the inlet of the drain bend pipe from the front side of the pot-shaped part is guided to the front side (the inlet side of the drain bend pipe) through the rear bottom part that protrudes forward from the rear side of the water accumulation part of the bottom wall of the pot-shaped part, and the cleaning water can also flow into the inlet of the drain bend pipe from the rear side.

[0030] This increases the overall water pressure of the cleaning water flowing into the inlet of the drainage bend, thereby improving the performance of waste removal.

[0031] In this invention, it is preferable that, when viewed in cross-section from the side, the apex of the upwardly convex portion of the inclined part is located within the height range between the upper and lower ends of the rear bottom surface.

[0032] In this invention, when the inclined portion of the bottom wall of the pot-shaped part is viewed in cross section from the side, the apex of the portion that is formed in an upward convex shape is located within the height range between the upper and lower ends of the rear bottom surface. Therefore, the part where the washing water leaves the inclined portion can be set at a position closer to the top than the inlet of the drain bend pipe.

[0033] This concentrates the cleaning water and debris just before it flows into the drain bend in the central section, thereby increasing water pressure and improving the performance of debris discharge.

[0034] In this invention, it is preferred that, when viewed in cross-section from the side, the upwardly convex portion of the inclined section is formed by a curved surface, and its overall shape is such that it slopes downward from the front region of the water accumulation section to the inlet of the drainage bend.

[0035] In this invention, when the inclined portion of the bottom wall of the pot-shaped part is viewed in cross-section from the side, its upwardly convex portion is formed by a curved surface. The entire portion is sloping downwards from the front region of the water collection section to the inlet of the drain bend. Therefore, compared to the rear region of the water collection section, the downward angle of the bottom wall of the pot-shaped part is smaller in the front region, resulting in a more nearly flat shape. Consequently, in the front region of the water collection section, the washing water easily changes direction by colliding with the bottom wall, promoting longitudinal swirling flow.

[0036] On the other hand, in the rear region of the water collection section, the bottom wall of the pot-shaped section faces downward at a greater angle compared to the front region of the water collection section. As a result, in the rear region of the water collection section, it is not necessary to direct the cleaning water and sewage towards the front region, but rather to guide them to the inlet of the drain bend pipe behind the sloping section.

[0037] In addition, the longitudinal swirling within the pitcher-shaped section facilitates the stirring of waste and increases the water pressure of the cleaning water flowing into the drain bend, thereby improving waste discharge performance.

[0038] In this invention, it is preferable to include a downcomer extending downward from the basin and an upcomer connected to the downcomer and extending upward from the downcomer. The downcomer has an inlet and an outlet formed at the connection with the upcomer. The upcomer has an inlet formed at the connection with the downcomer and an outlet formed on the downstream side. When a first horizontal imaginary line, a second horizontal imaginary line, and a third imaginary line are set, a reduction portion is formed between the first horizontal imaginary line and the second horizontal imaginary line, where the height of the vertical cross-section perpendicular to the flow line of the cleaning water is less than that on the downstream side. The first horizontal imaginary line is a line extending forward from the connection between the downcomer and the basin on the rear side. The second horizontal imaginary line is a line located closer to the bottom than the first horizontal imaginary line and extending forward from the top of the connection between the downcomer and the upcomer. The third imaginary line is a line extending forward from the top of the downcomer along the flow line of the cleaning water.

[0039] In this invention, when the first, second, and third imaginary horizontal lines are set, a reduction portion is formed between the first and second imaginary horizontal lines, where the height of the vertical cross-section perpendicular to the flow line of the cleaning water is less than that on the downstream side. The first imaginary horizontal line extends forward from the connection between the downpipe and the rear side of the basin. The second imaginary horizontal line is located closer to the bottom than the first imaginary horizontal line and extends forward from the top of the connection between the downpipe and the riser. The third imaginary line extends along the flow line of the cleaning water from the top of the downpipe. Therefore, when the cleaning water is used to press out dirt, the phenomenon of water pressure weakening (pressure relief) caused by the cleaning water flowing under the dirt can be prevented. Thus, the cleaning performance can be suppressed by effectively utilizing the water flow of the cleaning water. Furthermore, even when the reducing unit is installed in the downcomer pipe, it can prevent the water pressure from weakening around the dirt after the dirt enters the downcomer pipe. Therefore, it can prevent the cause of blockage while preventing the decline in cleaning performance (effectively utilizing the water flow of the cleaning water).

[0040] In this invention, it is preferable that the reduction portion is provided on the bottom surface of the front region of the basin connected to the downcomer or on the side surface of the front side of the downcomer, and is formed by a first arc surface protruding toward the center side of the downcomer.

[0041] In this invention, the reducing part is provided on the bottom surface of the front region of the basin connected to the downpipe or on the side of the front side of the downpipe, and is formed by a first arc surface protruding toward the center side of the downpipe. Therefore, it can guide dirt toward the center of the downpipe and prevent water pressure from weakening from below the dirt.

[0042] In this invention, it is preferable that the top of the first arc surface is located between the first horizontal imaginary line and the second horizontal imaginary line.

[0043] In this invention, the top of the first arc surface is positioned between the first horizontal imaginary line and the second horizontal imaginary line. Therefore, at the top of the first arc surface, water pressure reduction from the surrounding dirt can be prevented, thereby effectively utilizing the water flow of the cleaning water and preventing a decline in cleaning performance.

[0044] In this invention, it is preferable that the connection between the downcomer and the rear side of the basin is formed by a rear arc portion protruding toward the center of the basin.

[0045] In this invention, the connection between the downcomer pipe and the rear side of the basin is formed by a rear arc portion protruding toward the center of the basin. This prevents the pressure of the cleaning water from leaking from the rear side of the dirt, thereby effectively utilizing the water flow of the cleaning water and preventing a decrease in cleaning performance.

[0046] In this invention, it is preferable that the rear arc portion is positioned closer to the top than the first arc surface.

[0047] In this invention, the rear arc portion is positioned closer to the top than the first arc surface, thus preventing a significant reduction in the height of the vertical cross-section of the downcomer pipe and preventing pressure loss of the cleaning water.

[0048] In this invention, it is preferable that the basin has a waste receiving surface and a water collection part disposed below the waste receiving surface, and a second arc surface protruding toward the center side of the basin is provided on the bottom surface of the water collection part.

[0049] In this invention, a second arcuate surface protruding toward the center of the basin is provided on the bottom surface of the water accumulation part, so that dirt can be smoothly guided from the second arcuate surface to the first arcuate surface.

[0050] In this invention, it is preferable that the first arc surface and the second arc surface are continuously arranged, and the radius of curvature of the first arc surface is set to be greater than the radius of curvature of the second arc surface.

[0051] In this invention, the first arc surface and the second arc surface are continuously arranged, and the radius of curvature of the first arc surface is set to be greater than the radius of curvature of the second arc surface. Therefore, the first arc surface can be used to peel off a portion of the cleaning water flowing along the second arc surface of the water accumulation section, and the cleaning water and dirt can be guided to the central side of the downcomer pipe, thereby increasing the surface pressure (water pressure) to discharge the dirt. Attached Figure Description

[0052] Figure 1 This is a schematic top view of a flush toilet according to the first embodiment of the present invention.

[0053] Figure 2 It is along the direction Figure 1 Side sectional view of line II-II.

[0054] Figure 3A Is Figure 2 The enlarged side sectional view of the pot-shaped portion of the toilet body is shown in the side sectional view of the flush toilet according to the first embodiment of the present invention.

[0055] Figure 3B It is magnification Figure 3A The image shows an enlarged side sectional view of the front portion of the pot-shaped part of the toilet body of the flush toilet according to the first embodiment of the present invention.

[0056] Figure 4 This is a partially enlarged top view of the pot-shaped portion of the toilet body in the first embodiment of the flush toilet of the present invention.

[0057] Figure 5A It is along the direction Figure 1 A cross-sectional view of the VA-VA line.

[0058] Figure 5B Is Figure 5A The image shows a cross-sectional view of the lower portion of the pot-shaped part of the basin section in the toilet body of the flush toilet according to the first embodiment of the present invention.

[0059] Figure 6A It is along the direction Figure 1 A cross-sectional view of the VIA-VIA line.

[0060] Figure 6B exist Figure 6A The image shows a cross-sectional view of the lower portion of the pot-shaped part of the basin section in the toilet body of the flush toilet according to the first embodiment of the present invention.

[0061] Figure 7A It is along the direction Figure 1 A sectional view of line VIIA-VIIA.

[0062] Figure 7B exist Figure 7A The image shows a cross-sectional view of the lower portion of the pot-shaped part of the basin section in the toilet body of the flush toilet according to the first embodiment of the present invention.

[0063] Figure 8A It is along the direction Figure 1 A cross-sectional view along line VIIIA-VIIIA.

[0064] Figure 8B exist Figure 8A The image shows a cross-sectional view of the enlarged basin portion of the toilet body of the flush toilet according to the first embodiment of the present invention.

[0065] Figure 9 This is a simplified top view illustrating the flow of cleaning water in the following state: In the basin of the flush toilet according to the first embodiment of the present invention, the cleaning water discharged from the second inner edge spout swirls from the rear side to the front side of the basin and then flows into the pot-shaped part from the front side.

[0066] Figure 10 This is a simplified side cross-sectional view illustrating the flow of cleaning water from the first inner edge outlet and the second inner edge outlet into the front area of ​​the pot-shaped part of the flush toilet according to the first embodiment of the present invention.

[0067] Figure 11 This is a top view showing the flush toilet according to the second embodiment of the present invention.

[0068] Figure 12 It is along Figure 11 A cross-sectional view observed along line XII-XII.

[0069] Figure 13 It is an enlarged representation Figure 12 A partially enlarged sectional view of the recess and drainage bend of the pipe.

[0070] Figure 14 It is an enlarged representation Figure 12 The concave portion and drainage bend are also shown in enlarged sectional views of the first to third imaginary lines.

[0071] Figure 15A It is along Figure 13 A cross-sectional view observed along line XⅢA-XⅢA.

[0072] Figure 15B It is along Figure 13 A cross-sectional view observed along line XⅢB-XⅢB.

[0073] Figure 15C It is along Figure 13 A cross-sectional view observed along the XIIIC-XIIIC line.

[0074] Figure 15D It is along Figure 13 A cross-sectional view observed along the XIIID-XIIID line.

[0075] Figure 16A This is a schematic diagram illustrating the flow of waste and flushing water in a flush toilet according to the second embodiment of the present invention.

[0076] Figure 16B This is a schematic diagram illustrating the flow of waste and flushing water, as well as the pressure relief phenomenon, in an existing flush toilet.

[0077] Symbol Explanation

[0078] 1-Flush toilet; 6-Basin; 8-Drainage bend pipe; 12-Pot-shaped part; 14-Sewage receiving surface; 18-Inner edge; 32-Bottom wall; 36, 38-Side walls; 40-Lower joint (joint); 44-Inclined part; 46-Guide part; 130-Downward pipe; 132-Upward pipe; 134a-Front side arc surface (second arc surface); 134b-Rear side arc surface (first arc surface); 136-Rear arc part; 142, 146-Outlet; L11-First horizontal imaginary line; L12-Second horizontal imaginary line; L13-Third imaginary line; 152-Reduction part; W0-Water accumulation part. Detailed Implementation

[0079] The following is for reference Figures 1-10The flush toilet according to the first embodiment of the present invention will be described.

[0080] like Figure 1 and Figure 2 As shown, the flush toilet 1 according to the first embodiment of the present invention includes a toilet body 2 made of ceramic.

[0081] The toilet body 2 has a water guide 4, a basin-shaped basin 6, and a drain bend pipe 8 from the upstream side to the downstream side.

[0082] Therefore, the flushing toilet 1 according to the first embodiment of the present invention becomes a so-called "direct flushing toilet" that flushes away waste by means of the flow of water generated by the drop of water in the basin 6.

[0083] Furthermore, the flush toilet 1 according to the first embodiment of the present invention can also be applied to a so-called "siphon flush toilet" in which waste is sucked into the basin 6 by siphon action and then discharged to the outside in one go through the drain bend pipe 8.

[0084] In addition, Figure 1 and Figure 2 In the flush toilet 1 of this embodiment shown, although a toilet seat (not shown) and a toilet cover (not shown) are provided on the top of the toilet body 2, the specific description is omitted because the structure is the same as that of the existing flush toilet.

[0085] Furthermore, behind the toilet seat (not shown) and toilet lid (not shown) on the top of the toilet body 2, there may be a sanitary cleaning section (not shown) for cleaning the user's area or a water supply system function (not shown) related to the water supply function to the toilet body 2. However, since these are the same as the existing flush toilets, specific descriptions are omitted.

[0086] Next, as Figure 1 As shown, in one embodiment of the present invention, the flush toilet 1 includes a gravity-fed water tank 10 that stores cleaning water used for toilet cleaning and supplies water to the toilet body 2.

[0087] In this embodiment, the source of cleaning water for supplying cleaning water to the toilet body 2 is not limited to a tank-type water tank such as the gravity-fed water tank 10 described above, but other methods can also be used. That is, the source of cleaning water for supplying cleaning water to the toilet body 2 can be a direct-pressure method using the water supply pressure of the tap water pipe, a flush valve method, or a method that uses a pump to supplement the pressure and supply cleaning water.

[0088] Next, in Figure 1 In the flush toilet 1 according to the first embodiment of the present invention shown, when viewed from above, the basin 6 of the toilet body 2 is represented by the symbol "X" to indicate the central axis extending in the horizontal left-right direction in such a way that the pot-shaped portion 12 provided in the left and right center of the basin 6 is divided into two equal parts in the front-back direction.

[0089] Additionally, when viewed from above Figure 1 When the basin 6 of the toilet body 2 is shown, the symbol "Y" represents the central axis extending in the horizontal front-back direction in such a way that the basin 6 is divided into two equal parts in the left-right direction.

[0090] Moreover, when viewed from above Figure 1 When showing the basin 6 of the toilet body 2, the intersection of the central axes X and Y is taken as the center O of the basin 6 when viewed from above. Figure 1 and Figure 2 The symbol “Z” is used to represent the central axis that extends vertically through the center O.

[0091] In addition, such as Figure 1 As shown, the directions of the flush toilet 1, front, back, left, and right, are represented by "front", "back", "left", and "right" respectively.

[0092] Moreover, such as Figure 1 and Figure 2 As shown, in the flush toilet 1 of this embodiment, the area inside the basin 6 that is closer to the front side than the central axis X is defined as the "front area F of the basin 6". In addition, in the front area F of the basin 6, the left area L and the right area R are defined as the "left front area LF of the basin 6" and the "right front area RF of the basin 6" respectively, with respect to the central axis Y in the horizontal front-back direction of the basin 6.

[0093] Similarly, regarding the area within the basin 6, the area closer to the rear side compared to the central axis X is defined as "the rear region B of the basin 6". Furthermore, within the rear region B of the basin 6, with respect to the central axis Y in the horizontal front-rear direction of the basin 6, the left region L and the right region R are defined as "the left rear region LB of the basin 6" and "the right rear region RB of the basin 6", respectively.

[0094] Next, as Figure 1 As shown, the water guide 4, located on the upstream side of the toilet body 2, is formed on the rear side of the basin 6, and guides the cleaning water supplied from the water storage tank 10 to the basin 6.

[0095] In addition, such as Figure 1 and Figure 2As shown, the basin 6 located downstream of the water channel 4 of the toilet body 2 has a pot-shaped part 12, a waste receiving surface 14, a platform part 16 and an inner edge part 18, which will be described in detail later, from bottom to top.

[0096] Furthermore, a first inner edge water outlet 20 is provided on the front side of the inner edge portion 18 of the left rear region LB of the basin 6, and a second inner edge water outlet 22 is provided on the rear side of the inner edge portion 18 of the right rear region RB of the basin 6.

[0097] Next, as Figure 1 and Figure 2 As shown, the water guide channel 4 has a common water guide channel 24, a first inner edge water guide channel 26, and a second inner edge water guide channel 28.

[0098] First, a common water passage 24 is formed inside the toilet body 2 on the rear side of the basin 6, extending from the rear inlet 4a to the vicinity of the rear side of the basin 6, and the inlet 4a is connected to the water tank 10.

[0099] In addition, the first inner edge water guide 26 branches from the common water guide 24 to the left side of the basin 6 near the back side of the basin 6, and then is formed inside the inner edge 18 of the left front region LF of the basin 6 in such a way that it extends to the first inner edge water outlet 20 on the front side while meandering around the outer peripheral surface of the basin 6.

[0100] Thus, the cleaning water supplied from the common water passage 24 to the first inner edge water passage 26 forms a swirling flow, which is discharged forward from the first inner edge outlet 20 toward the platform 16 on its front side as the first inner edge outlet, and then swirles from the left front region LF in the basin 6 through the right front region RF to the right rear region RB.

[0101] Furthermore, the second inner edge water guide 28 branches from the common water guide 24 to the right side of the basin 6 near the rear side of the basin 6, and then bends (reverses) towards the second inner edge spout 22 on the left side near the right side of the toilet body 2, forming inside the rear side of the inner edge 18 of the right rear region RB of the basin 6 in such a way as to extend to the second inner edge spout 22.

[0102] Thus, the cleaning water supplied from the common water passage 24 to the second inner edge water passage 28 is discharged from the second inner edge outlet 22 toward the platform 16 on its rear side as the second inner edge water discharge, and then swirls from the right rear region RB in the basin 6 through the left rear region LB to the left front region LF, and then flows from the left front region LF into the front region in the pot-shaped part 12.

[0103] In addition, a portion of the water discharged from the second inner edge outlet 22 flows into the rear area of ​​the pot-shaped portion 12 from the waste receiving surface 14, which is closer to the rear area than the pot-shaped portion 12 of the basin portion 6.

[0104] Furthermore, although the method of setting the platform 16 of the basin 6 between the outer edge and the lower end of the inner edge 18 of the waste receiving surface 14 is described in this embodiment, it is not necessary to set the platform 16. Instead, the platform 16 can be omitted, and the first inner edge water discharge and the second inner edge water discharge from the first inner edge discharge port 20 and the second inner edge discharge port 22 respectively are discharged directly to the upper edge of the waste receiving surface 14 without passing through the platform 16.

[0105] Next, refer to Figures 1 to 8B The pot-shaped portion 12 of the basin 6 and its surrounding parts are described in detail.

[0106] First, such as Figure 2 and Figure 3A As shown, the pot-shaped part 12 of the basin 6 is located below the waste receiving surface 14, and the accumulated water forms a water collection part W0.

[0107] Here, in Figure 2 and Figure 3A In the text, the symbol "WL" indicates the water level (sealed water level) of the water accumulation section W0 of the pot-shaped part 12 of the basin 6 in the standby state (sealed water state) before toilet cleaning.

[0108] Next, as Figures 3A to 8B As shown, the pot-shaped portion 12 has a bottom wall 32, which is disposed above and in front of the inlet 30 of the drain bend pipe 8 to form the bottom surface 32a of the pot-shaped portion 12.

[0109] In addition, the pot-shaped part 12 has a rear wall 34 located on the rear side of the inlet 30 of the drain bend pipe 8.

[0110] Furthermore, the pot-shaped portion 12 has side walls 36 and 38 (left side wall 36 and right side wall 38) that are arranged to face forward from the left and right ends of the rear wall 34.

[0111] In addition, the left and right sidewalls 36 and 38 of the pot-shaped portion 12 are respectively formed to narrow inward in the left and right directions, and their respective front ends 36a and 38a are joined together.

[0112] Next, as Figure 3B , Figure 5B , Figure 6B , Figure 7B and Figure 8BAs shown, the pot-shaped portion 12 also has a lower side joint portion 40, which joins the outer edge 32b of the bottom surface 32a of the bottom wall 32 with the lower edges 36b and 38b of the side walls 36 and 38 through a curved surface (curved surface C1).

[0113] In addition, Figure 3B From the side sectional view and in Figure 5B , Figure 6B , Figure 7B and Figure 8B In a cross-sectional view from the front, the curvature of the curved surface C1 in the interval between the lower edge 40a and the upper edge 40b of the lower joint 40 is set to be greater than the curvature of the tangent plane C2, which includes the bottom surface 32a at the lower joint point P1 where the lower edge 40a (lower edge 40a of the curved surface C1) of the lower joint 40 and the outer edge 32b of the bottom surface 32a of the bottom wall 32 are joined.

[0114] Similarly, in Figure 3B From the side sectional view and in Figure 5B , Figure 6B , Figure 7B and Figure 8B In a cross-sectional view from the front, the curvature of the curved surface C1 of the lower joint 40 is set to be greater than the curvature of the tangent plane C3, which includes the wall surface of the sidewalls 36 and 38 at the upper joint point P2 where the upper edge 40b of the lower joint 40 (the upper edge 40b of the curved surface C1) and the lower edges 36b and 38b of the sidewalls 36 and 38 meet.

[0115] Next, as Figure 3B , Figure 5A , Figure 6A , Figure 7A and Figure 8A As shown, the pot-shaped portion 12 also has an upper joint portion 42, which joins the upper edges 36c and 38c of the sidewalls 36 and 38 with the lower edge 14a of the dirt receiving surface 14 through a curved surface (curved surface C4).

[0116] In addition, Figure 3A and Figure 3B From the side sectional view and in Figure 5B , Figure 6B , Figure 7B and Figure 8B In a cross-sectional view from the front, the curvature of the curved surface C4 in the interval between the lower edge 42a and the upper edge 42b of the upper joint 42 is set to be greater than the curvature of the tangent plane C5, which includes the wall surface of the sidewalls 36 and 38 at the lower joint point P3 where the lower edge 42a of the upper joint 42 (the lower edge 42a of the curved surface C4) and the upper edges 36c and 38c of the sidewalls 36 and 38 meet.

[0117] Similarly, in Figure 3A and Figure 3B From the side sectional view and in Figure 5B , Figure 6B , Figure 7B and Figure 8B In a cross-sectional view from the front, the curvature of the curved surface C4 of the upper joint 42 is set to be greater than the curvature of the cutting plane C6, which includes the wall of the dirt-receiving surface 14 at the upper joint point P4 where the upper edge 42b (the upper edge 42b of the curved surface C4) of the upper joint 42 and the lower edge 14a of the dirt-receiving surface 14 meet.

[0118] Here, in Figures 2-4 In the flush toilet 1 of this embodiment shown, the symbol "L1" indicates the boundary line between the bottom wall 32 of the pot-shaped part 12 and the lower joint 40. This boundary line corresponds to the outer edge 32b of the bottom wall 32 of the pot-shaped part 12 and the lower edge 40a of the lower joint 40.

[0119] In addition, the symbol "L2" indicates the boundary line between the lower joint 40 of the pot-shaped portion 12 and the side walls 36 and 38. This boundary line corresponds to the upper edge 40b of the lower joint 40 of the pot-shaped portion 12 and the lower edges 36b and 38b of the side walls 36 and 38.

[0120] Furthermore, the symbol "L3" represents the boundary line between the side walls 36 and 38 of the pot-shaped portion 12 and the upper joint portion 42, which corresponds to the upper edges 36c and 38c of the side walls 36 and 38 of the pot-shaped portion 12 and the lower edge 42a of the upper joint portion 42.

[0121] Additionally, the symbol "L4" indicates the boundary line between the upper joint 42 of the pot-shaped portion 12 and the dirt-receiving surface 14, which corresponds to the upper edge 42b of the upper joint 42 of the pot-shaped portion 12 and the lower edge 14a of the dirt-receiving surface 14.

[0122] Next, as Figure 4 , Figure 5B , Figure 6B , Figure 7B and Figure 8B As shown, when viewed in cross-section from the front, the bottom wall 32 of the pot-shaped portion 12 has a concave inclined portion 44 formed with respect to its left and right central axes Z in a manner that is concave downward over the left and right span.

[0123] In addition, such as Figure 4 , Figure 5B , Figure 6B , Figure 7B and Figure 8B As shown, the bottom wall 32 of the pot-shaped part 12 has a guide part 46, which is formed on the left and right sides of the inclined part 44 and guides the cleaning water or dirt from the front toward the inlet 30 of the drain bend pipe 8.

[0124] Moreover, such as Figure 5B , Figure 6B , Figure 7B and Figure 8B As shown, on the bottom wall 32 of the pot-shaped portion 12, a guide portion 46 is provided in the area between the lower joint portion 40 and the inclined portions 44 on the left and right inner sides. It is formed as a convex curved surface C7 that protrudes upward from the planar shape along with the lower joint portion 40 towards the left and right inner sides, and then transitions to the concave curved surface C8 of the inclined portion 44.

[0125] Here, in Figure 4 , Figure 5B , Figure 6B , Figure 7B and Figure 8B In the bottom wall 32 of the pot-shaped portion 12, the inclined portion 44 and the guide portion 46 are marked with the symbol "P5" to indicate the point (inflection point) where the curved surface C7 of the convex guide portion 46 on the left and right outer sides changes to the curved surface C8 of the concave inclined portion 44 on the left and right inner sides. This inflection point P5 also becomes the junction point between the lower end of the left and right inner sides of the guide portion 46 and the upper end of the left and right outer sides of the inclined portion 44.

[0126] In addition, such as Figure 4 As shown, when viewed from above, the inclined portion 44 and guide portion 46 of the bottom wall 32 of the pot-shaped portion 12 are represented by the symbol "L5", which indicates the boundary line between the upper left and right outer sides of the inclined portion 44 and the lower left and right inner sides of the guide portion 46 on the plane.

[0127] Therefore, when viewed in cross-section from the front, the curved surface C7 of the guide portion 46 of the bottom wall 32 of the pot-shaped portion 12 is formed in a convex shape upwards, while when viewed in cross-section from the front, the curved surface C8 of the inclined portion 44 is formed in a concave shape downwards from the lower end of the left and right inner sides of the guide portion 46.

[0128] Next, as Figure 5B , Figure 6B , Figure 7B and Figure 8B As shown, the curved surface C8 of the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12 is set such that, when viewed in cross section from the front, the amount of concavity d1 in the vertical direction from its upper end (inflection point P5) to the lowest bottom position P6 increases along with the inlet 30 side of the drainage bend pipe 8 facing the rear.

[0129] In addition, such as Figure 4 As shown, when viewed from above, the sloping portion 44 of the bottom wall 32 of the pot-shaped portion 12 is wide in the left and right direction (horizontal width M) and is set to increase along with the inlet 30 side of the drainage bend pipe 8 facing backward.

[0130] Next, as Figure 3A As shown, when viewed in cross-section from the side, the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12 is formed in a convex shape that is convex upward as a whole, while it is inclined downward from the front toward the inlet 30 of the drain bend pipe 8.

[0131] In addition, such as Figure 3A As shown, when viewed in cross-section from the side, the upwardly convex portion of the inclined section 44 is formed by a curved surface (curved surface C8). The entire curved surface C8 is formed to slope downward from the front area of ​​the water accumulation section W0 to the inlet 30 of the drainage bend pipe 8.

[0132] Next, as Figure 3A As shown, the bottom wall 32 of the pot-shaped part 12 also has a rear bottom part 48 that protrudes forward from the rear side of the water accumulation part W0.

[0133] More specifically, the rear bottom part 48 is configured to protrude forward from the lower end of the rear wall 34 of the pot-shaped part 12 so as to guide the cleaning water on the rear side of the pot-shaped part 12 to the front side, and is positioned closer to the top and front than the rear end of the inlet 30 of the drain bend pipe 8.

[0134] In addition, such as Figure 3A As shown, when the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12 is viewed from the side in cross section, the vertex Q1 of the portion (curved surface C8) that is formed in an upward convex shape is located within the range of the height position (vertical width H1) between the upper end position Q2 and the lower end position Q3 of the surface that forms the rear bottom portion 48.

[0135] Therefore, the apex Q1 of the upwardly convex portion (curved surface C8) of the inclined portion 44, which is the part from which the cleaning water of the inclined portion 44 can leave the inclined portion 44, is set at a position closer to the top than the inlet 30 of the drain bend pipe 8.

[0136] Next, refer to Figures 1-10 The flow of cleaning water in the basin 6 during toilet cleaning in a flush toilet 1 according to one embodiment of the present invention will be described.

[0137] First, such as Figure 9 As shown, in the flush toilet 1 of this embodiment, when toilet flushing begins, the flushing water W in the water tank 10 is supplied from the inlet 4a of the water guide 4 of the toilet body 2 to the common water guide 24. The flushing water W in the common water guide 24 is branched into the first inner edge water guide 26 and the second inner edge water guide 28 as the first flushing water W1 and the second flushing water W2, respectively.

[0138] Next, as Figure 9 and Figure 10 As shown, the first cleaning water W1 of the first inner edge water guide 26 is discharged forward from the first inner edge water outlet 20 on the downstream side as the first inner edge water discharge W1. The first inner edge water discharge W1 forms a swirling flow f1 that circulates from the left front region LF in the basin 6 through the right front region RF to the right rear region RB.

[0139] On the other hand, such as Figure 9 and Figure 10 As shown, the second cleaning water W2 of the second inner edge water guide 28 is discharged from the second inner edge water outlet 22 as the second inner edge water outlet W2. The second inner edge water outlet W2 forms a water flow f2, which swirls from the right rear region RB in the basin 6 through the left rear region LB to the left front region LF, and then flows from the left front region LF into the front region in the pot-shaped part 12.

[0140] Additionally, a portion of the second inner edge water discharge W2 discharged from the second inner edge outlet 22 flows into the rear region of the pot-shaped portion 12 from the waste receiving surface 14, which is closer to the rear region than the pot-shaped portion 12 of the basin portion 6.

[0141] Next, as Figure 9 and Figure 10 As shown, the cleaning water W3 flowing into the pot-shaped part 12 is concentrated towards the inclined portion 44 side (left and right center side) of the bottom wall 32 of the pot-shaped part 12, thus forming a water flow f3 that converges from the bottom wall 32 of the pot-shaped part 12 toward the inlet 30 of the drain bend pipe 8, forming a water flow that forcefully pushes dirt into the drain bend pipe 8.

[0142] Additionally, in the cleaning water W3 that is guided to the lower part of the jug-shaped portion 12, a portion of the cleaning water that is guided from the side to the lower part of the jug-shaped portion 12 in the front region collides with the bottom surface 44a (curved surface C8) of the inclined portion 44 and bounces back upward or forward, thereby forming a water flow that swirls in the longitudinal direction (hereinafter "longitudinal swirling flow f4").

[0143] Thus, the longitudinal swirling flow f4 of the cleaning water W3 flowing into the jug-shaped part 12 mixes the dirt in the jug-shaped part 12 with the water in the water accumulation part W0, and then discharges it from the inlet 30 of the drain bend pipe 8 into the drain bend pipe 8.

[0144] According to the first embodiment of the present invention described above, the flush toilet 1 discharges cleaning water W1 and W2 from the first inner edge outlet 20 and the second inner edge outlet 22 into the basin 6, respectively, and flows into the pot-shaped part 12 from the waste receiving surface 14.

[0145] At this time, the cleaning water W3 or dirt in the pot-shaped part 12 is guided by the guide parts 46 on the left and right outer sides of the inclined part 44 formed on the bottom wall 32 of the pot-shaped part 12 in a way that it is concentrated towards the inclined part 44 on the left and right central sides, and then guided towards the inlet 30 of the drain bend pipe 8.

[0146] In addition, Figure 3A As shown in the cross-sectional view from the side, the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12 is formed in a convex shape that is convex upward as a whole, while it is inclined downward from the front toward the inlet 30 of the drain bend pipe 8. Therefore, a portion of the cleaning water W3 flowing along the inclined portion 44 can be stripped near the apex Q1 of the curved surface C8 of the inclined portion 44.

[0147] This increases the water pressure of the cleaning water W3, which contains dirt concentrated in the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12, and guides the cleaning water W3 and dirt to the central side of the inlet 30 of the drain bend pipe 8.

[0148] Therefore, at the inlet 30 of the drain bend pipe 8, the pressure of the cleaning water containing dirt can be increased, thus improving the dirt discharge performance.

[0149] Furthermore, according to the flush toilet 1 involved in this embodiment, such as Figure 5B , Figure 6B , Figure 7B and Figure 8B As shown, when the bottom wall 32 of the pot-shaped part 12 is viewed in cross section from the front, the curved surface C7 of the guide part 46 is formed in a convex shape upwards, while the curved surface C8 of the inclined part 44 is formed in a concave shape downwards from the lower end (inflection point P5) of the left and right inner sides of the guide part 46.

[0150] As a result, the convex portions on the left and right sides of the inclined portion 44 prevent the cleaning water W3 that flows over the convex guide portion 46 into the concave inclined portion 44 from flowing out of the inclined portion 44 again.

[0151] Thus, the cleaning water W3 is maintained in the concave inclined portion 44, and the cleaning water W3 and dirt can be guided from the inlet 30 of the drain bend pipe 8 to the central side of the flow path section in the drain bend pipe 8.

[0152] This increases the water pressure of the cleaning water containing the dirt concentrated in the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12, thereby improving the dirt discharge performance.

[0153] Furthermore, according to the flush toilet 1 of this embodiment, such as Figure 5B , Figure 6B , Figure 7B and Figure 8BAs shown, when the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12 is viewed in cross section from the front, the vertical concavity d1 from the upper end (inflection point P5) of the curved surface C8 of the inclined portion 44 to the lowest bottom position P6 is set to increase along with the inlet 30 side of the drainage bend pipe 8 facing the rear.

[0154] Therefore, just before the cleaning water W3 in the inclined section 44 is about to flow into the inlet 30 of the drain bend pipe 8, the convex guide section 46 that crosses the left and right outer sides of the inclined section 44 can be suppressed.

[0155] This increases the water pressure of the cleaning water W3 flowing into the inlet 30 of the drain bend pipe 8, and effectively guides the cleaning water W3 and dirt from the inlet 30 of the drain bend pipe 8 to the central side of the flow path section within the drain bend pipe 8, thereby improving the dirt discharge performance.

[0156] Furthermore, according to the flush toilet 1 involved in this embodiment, such as Figure 4 As shown, when viewed from above, the sloping portion 44 of the bottom wall 32 of the pot-shaped portion 12 is wide in the left and right direction (horizontal width M) and is set to increase along with the inlet 30 side of the drainage bend pipe 8 facing backward.

[0157] Therefore, when the cleaning water flows from the inclined part 44 into the inlet 30 of the drain bend pipe 8, after guiding the cleaning water W3 and dirt to a large area of ​​the inlet 30 of the drain bend pipe 8, it can be guided to the central side of the flow path cross section within the drain bend pipe 8.

[0158] This increases the water pressure of the cleaning water W3 when waste is discharged from the jug-shaped section 12 into the drain bend pipe 8, thereby improving the waste discharge performance.

[0159] Furthermore, according to the flush toilet 1 of this embodiment, in addition to the cleaning water W3 flowing into the inlet 30 of the drain bend pipe 8 from the front side of the pot-shaped part 12, the cleaning water W3 from the rear side of the pot-shaped part 12 is also guided to the front side (the inlet 30 side of the drain bend pipe 8) through the rear bottom part 48 protruding forward from the rear side of the water accumulation part W0 of the bottom wall 32 of the pot-shaped part 12, so that the cleaning water can also flow into the inlet 30 of the drain bend pipe 8 from the rear side.

[0160] This increases the overall water pressure of the cleaning water W3 flowing into the inlet 30 of the drainage bend pipe 8, thereby improving the performance of waste discharge.

[0161] Furthermore, according to the flush toilet 1 involved in this embodiment, such as Figure 3AAs shown, when the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12 is viewed from the side in cross section, the vertex Q1 of the portion (curved surface C8) that is formed in an upward convex shape is located within the range of the height position (vertical width H1) between the upper end position Q2 and the lower end position Q3 of the surface that forms the rear bottom portion 48.

[0162] Therefore, the apex Q1 of the upwardly convex portion of the inclined section 44, where the cleaning water W3 of the inclined section 44 leaves the inclined section 44, is set at a position closer to the top than the inlet 30 of the drain bend pipe 8.

[0163] These results concentrate the cleaning water W3 and dirt just before it flows into the inlet 30 of the drain bend pipe 8 on the central side, thereby increasing the water pressure and thus improving the dirt discharge performance.

[0164] Furthermore, according to the flush toilet 1 of this embodiment, such as Figure 3A As shown, when the inclined portion 44 of the bottom wall 32 of the pot-shaped portion 12 is viewed in cross section from the side, the portion (bottom surface 44a) that is formed in an upward convex shape is formed by a curved surface (curved surface C8), and the whole is formed to slope downward from the front area of ​​the water accumulation portion W0 to the inlet 30 of the drainage bend pipe 8.

[0165] Therefore, regarding the area in front of the water accumulation section W0, compared to the area behind the water accumulation section W0, the downward angle of the bottom wall 32 of the pot-shaped section 12 is smaller, resulting in a shape that is closer to flat. Consequently, in the area in front of the water accumulation section W0, the washing water W3 can easily change direction by colliding with the bottom wall 32, promoting the longitudinal swirling flow f4.

[0166] On the other hand, in the area behind the water accumulation section W0, the bottom wall 32 of the pot-shaped section 12 has a larger downward angle compared to the area in front of the water accumulation section W0.

[0167] Therefore, in the area behind the water accumulation section W0, the cleaning water and sewage do not need to flow forward to the area in front, but can be guided to the inlet 30 of the drainage bend pipe 8 behind the inclined section 44.

[0168] In addition, the longitudinal rotation within the pot-shaped section 12 facilitates the stirring of waste and increases the water pressure of the cleaning water W3 flowing into the inlet 30 of the drain bend pipe 8, thereby improving the waste discharge performance.

[0169] Next, refer to Figures 11 to 16B The flushing toilet according to the second embodiment of the present invention will be described below. First, by... Figure 11 and Figure 12 The basic structure of the flush toilet according to the second embodiment of the present invention will be described.

[0170] like Figure 11 and Figure 12 As shown, the flushing toilet 100 according to the second embodiment of the present invention includes a toilet body 102 made of ceramic. The flushing toilet 100 is a so-called "direct flushing toilet" that flushes away waste by means of water flow generated by the drop of water in the basin. Furthermore, the flushing toilet according to this embodiment can also be applied to siphon flushing toilets.

[0171] The toilet body 102 of the flush toilet 100 has a water guide passage 104, a basin-shaped basin 106, and a drain bend pipe 108 from the upstream side to the downstream side. Furthermore, a toilet seat (not shown) and a toilet cover (not shown) are provided on the top of the toilet body 102.

[0172] Furthermore, the flush toilet 100 has a water storage tank 110 at its rear side, which stores cleaning water and supplies water to the toilet body 102. In this embodiment, in addition to the water storage tank 110, the cleaning water source can also be a direct-pressure type using the tap water supply pressure or a flush valve type, or a method that uses a pump to supplement the pressure to supply cleaning water.

[0173] A water guide passage 104 is provided on the upstream side of the toilet body 102, through which water is guided to the basin 106 from the water storage tank 110 (see reference). Figure 11 The basin 106 provides cleaning water. It includes: a waste receiving surface 112; an inner edge 114 disposed on the upper part of the waste receiving surface 112; a platform 116 disposed between the waste receiving surface 112 and the inner edge 114; and a pot-shaped part 118 disposed below the waste receiving surface 112 and forming a water collection part.

[0174] Furthermore, a first inner edge water outlet 120 for discharging cleaning water into the basin 106 is provided in the left front region of the inner edge portion 114 when viewed from the front, and a second inner edge water outlet 122 is provided in the right rear region.

[0175] The water guide passage 104 includes: a common water guide passage 124; and a first inner edge water guide passage 126 and a second inner edge water guide passage 128 that branch downstream from the common water guide passage 124. An inlet 104a for guiding cleaning water from the water storage tank 110 is formed at the upstream end of the common water guide passage 124.

[0176] Additionally, a first inner edge outlet 120 is formed at the downstream end of the first inner edge water guide 126, guiding the cleaning water to the first inner edge outlet 120. Similarly, a second inner edge outlet 128 is formed at the downstream end of the second inner edge water guide 128, guiding the cleaning water to the second inner edge outlet 128.

[0177] Cleaning water is discharged from the first inner edge outlet 120 toward the platform 116 on its front side, and cleaning water is discharged from the second inner edge outlet 122 toward the platform 116 on its rear side. Since the cleaning water is discharged from the first inner edge outlet 120 and the second inner edge outlet 122 in the same direction, a swirling flow is formed in the basin 106.

[0178] Furthermore, the cleaning water discharged from the first inner edge outlet 120 flows into the aforementioned pot-shaped portion 118 while swirling. The cleaning water discharged from the second inner edge outlet 122 flows into the front region of the pot-shaped portion 118 after swirling around it. The cleaning water discharged from the first inner edge outlet 120 and the cleaning water discharged from the second inner edge outlet 122 merge within the pot-shaped portion 118, forming a longitudinal swirling flow within it.

[0179] like Figure 12 As shown, a drain bend pipe 108 is connected to the pot-shaped portion 118 of the basin portion 106. The drain bend pipe 108 includes a downpipe 130 extending downward from the pot-shaped portion 118 and an uppipe 132 connected to the downstream end of the downpipe 130. The downstream side of the uppipe 132 extends to a drain outlet (not shown), where an external drain pipe (not shown) is connected.

[0180] Here, the jug-shaped portion 118 forms a water collection section through the accumulated water. Before flushing the toilet, the water accumulates to the sealing water level WL inside the jug-shaped portion 118.

[0181] Next, through Figure 13 The pot-shaped part 118 of the basin 106 and the drainage bend pipe 108 are described in detail.

[0182] like Figure 13 As shown, in the front region of the pot-shaped portion 118, a bottom surface 134 is provided that slopes gently downwards towards the rear. In the rear region of the pot-shaped portion 118, a rear arc-shaped portion 136 is provided that protrudes forward.

[0183] First, the bottom surface 134 of the pot-shaped portion 118 includes: a second arc-shaped surface, namely a front arc-shaped surface 134a, extending from the front side (position P11) to position P12 and having a large radius of curvature R11 (R11 = 200 mm); and a first arc-shaped surface, namely a rear arc-shaped surface 134b, which is formed on the rear side, continuing from the front arc-shaped surface 134a, extending from the rear side (position P12) to position P13 and having a smaller radius of curvature R12 (R12 = 30 mm). Here, it is preferable that the radius of curvature R11 of the front arc-shaped surface 134a is in the range of 180 mm to 230 mm. Furthermore, it is preferable that the radius of curvature R12 of the rear arc-shaped surface 134b is in the range of 20 mm to 40 mm.

[0184] Here, if the radius of curvature R11 is too small, the area of ​​the near-horizontal portion at the front of the water accumulation part, i.e., the pot-shaped part 118, becomes larger, so the dirt remains stranded and is difficult to be guided into the drain bend pipe 108. On the other hand, if the radius of curvature R11 is too large, the volume of the water accumulation part, i.e., the pot-shaped part 118, increases, and the dirt is more likely to spread during cleaning, resulting in poor drainage performance. Moreover, there is almost no near-horizontal portion at the front of the pot-shaped part 118, so the longitudinal swirling flow forming force is weakened, resulting in poor drainage performance.

[0185] In addition, if the radius of curvature R12 is too small, it becomes angular and the appearance deteriorates. Conversely, if the radius of curvature R12 is too large, the connection between the front side arc surface 134a and the drainage bend pipe 108 becomes inconspicuous, and the original purpose of suppressing pressure reduction cannot be achieved.

[0186] The rear arc portion 136 of the pot-shaped portion 118 is formed by an arc with a radius of curvature R13 (R13 = 8 mm). Preferably, the radius of curvature R13 is in the range of 6 mm to 12 mm. The position of the lower end of the rear arc portion 136 is indicated by P14. If the radius of curvature R13 is too large, a large step is formed between the rear and front of the pot-shaped portion 118, which makes it impossible to fully transfer the water flow from the rear to the front, resulting in turbulent water flow and a weakening of the longitudinal swirling flow forming force. In addition, the appearance is also worse due to the height difference between the front and rear of the pot-shaped portion 118.

[0187] Next, the downcomer 130 has its upstream end, i.e., inlet 140. In this embodiment, the inlet 140 is the portion determined by the line between the lower end position P14 of the rear arcuate portion 136 of the pot-shaped portion 118 connecting the basin portion 6 and the lower end position P13 of the rear region of the bottom surface 134 of the pot-shaped portion 118. The downcomer 130 has its downstream end, i.e., outlet 142.

[0188] The riser pipe 132 has its upstream end, i.e., inlet 144, and also has its downstream end, i.e., outlet 146 (see reference). Figure 12).

[0189] Next, through Figure 14 The positional relationship between the rear side arc surface 134b of the bottom surface 134 of the pot-shaped part 118 and the inlet 140 of the downcomer 130 will be explained.

[0190] Here, a first horizontal imaginary line L11 is drawn, extending horizontally forward from the lower end position P14 of the connection 148 between the downcomer 130 and the rear arc portion 136 of the pot-shaped portion 118. Next, a second horizontal imaginary line L12 is drawn, extending horizontally forward from the top 150a of the connection 150 between the downcomer 130 and the riser 132, which is located closer to the bottom than the first horizontal imaginary line L11. Then, a third imaginary line L13 is drawn, extending along the flow line F1 (which is also the axis of the downcomer 130) of the cleaning water flowing from the top 130a of the downcomer 130 through the interior of the downcomer 130.

[0191] like Figure 14 As shown, the position P16 of the top of the rear side arc surface 134b of the bottom surface 134 of the pot-shaped portion 118 is located between the first horizontal imaginary line L11 and the second horizontal imaginary line L12. Moreover, in this embodiment, the entire rear side arc surface 134b (the area from P12 to P13) is also located between the first imaginary line L11 and the second imaginary line L12.

[0192] Here, Figure 14 X11 indicates the cross-sectional shape of the area corresponding to the rear side arc surface 134b in the conventional flush toilet described in the aforementioned patent documents 1 to 3, and X12 indicates the cross-sectional shape of the rear arc portion 136 in the same conventional flush toilet.

[0193] In this embodiment, the rear side arc surface 134b of the bottom surface 134 of the pot-shaped portion 118 protrudes upwards more than that of conventional flush toilets. In addition, the radius of curvature R13 of the rear arc portion 136 is also smaller than that of conventional flush toilets, resulting in a greater forward protrusion.

[0194] Next, through Figure 13 and Figures 15A to 15D The cross-sectional shape of the downcomer 130 and its inlet 140 is described. Figure 15A and Figure 15B The dashed line represents the portion of the imaginary conduit formed by the imaginary line L13.

[0195] Figure 13The XVA-XVA line, XVB-XVB line, XVC-XVC line, and XVD-XVD line shown represent vertical cross-sections orthogonal to the streamline F1 (which is also the axis of the downcomer 130) of the cleaning water flowing through the downcomer 130.

[0196] first, Figure 15A The diagram shows the cross-sectional shape of a vertical section at position P16, which is the top of the rear side arc surface 134b of the bottom surface 134 of the pot-shaped portion 118. Here, the height of this vertical section is H11, which is a value less than the heights H12, H13, and H14 described later.

[0197] Figure 15B The diagram shows the cross-sectional shape of a vertical section at position P13, which is the connection point to the bottom surface 134 of the pot-shaped portion 118 on the front side of the downcomer 130. Here, the height of this vertical section is H12.

[0198] Figure 15C The diagram shows the cross-sectional shape of a vertical section at position P14, the lower end of the rear arcuate portion 136 of the pot-shaped portion 118 on the rear side of the downcomer 130. Here, the height of this vertical section is H13.

[0199] Figure 15D The diagram shows the cross-sectional shape of a vertical section at location P17 downstream of the inlet 140 of the downcomer 130. Here, the height of this vertical section is H14.

[0200] Here, the heights of each vertical section are related by the formula "H11 < H12 = H13 = H14". Furthermore, H12, H13, and H14 only need to be greater than the value of H11, and they can be different values. The shapes of each vertical section are approximately the same, roughly triangular, except for their heights. Even if the heights of the vertical sections of the hypothetical pipe and downcomer 130 change, the overall shape remains unchanged, thus suppressing maximum lateral changes in the flow path due to blockages caused by contaminants, etc. In other words, Figure 15A The cross-sectional area is minimized between the imaginary lines L11 and L12.

[0201] In the above-described embodiment, the height H11 of the vertical cross-section at position P16, which is located at the top of the rear side arcuate surface 134b of the bottom surface 134 of the pot-shaped portion 118, is less than the height of other vertical cross-sections located downstream. This position P16 forms a reduction portion 152 in the height of the vertical cross-section. This reduction portion 152 (position P16) is formed on the bottom surface 134 of the pot-shaped portion 118, which is closer to the upstream side than the inlet 140 of the downcomer 108.

[0202] In this embodiment, as Figure 14As shown, the preferred top position P16 is positioned closer to the lower side than the midpoint of the bisection of the heights of the first imaginary horizontal line L11 and the second imaginary horizontal line L12. Since the reducing section 152 is positioned closer to the lower side than the midpoint of the midpoint of the first imaginary horizontal line L11 and the second imaginary horizontal line L12, it can suppress the decrease in water pressure around the contaminant W after it enters the downcomer pipe 130 (or is moved to a nearby position). This prevents pressure loss that could cause blockages and further prevents a decrease in cleaning performance (effectively utilizing the water flow for cleaning).

[0203] However, in this embodiment, it can also be applied in other ways. The reduction portion 52, which is a smaller value than its downstream side, is located between the first horizontal imaginary line L11 and the second horizontal imaginary line L12, and can also be located in the downcomer 8.

[0204] Next, refer to Figure 16A and Figure 16B The function of the flush toilet 1 according to the above-described embodiments of the present invention will be explained.

[0205] First, such as Figure 16B As shown, in the existing flush toilet 160, if the water collection part, i.e. the pot-shaped part 162, is made larger than the existing one, it is difficult to form a water flow towards the center of the water collection part (pot-shaped part 162). The flushing is carried out while maintaining the diffusion of dirt in the water collection part (pot-shaped part 162). Therefore, a gap C is generated between the dirt W and the front side or the upstream side of the drain bend pipe 164. The flushing water FW flows out from the gap C, resulting in the so-called "pressure relief phenomenon". The water pressure (surface pressure) PB cannot be applied to the dirt W well, and the dirt may not be able to be discharged.

[0206] In contrast, such as Figure 16AAs shown, according to the flush toilet 100 of this embodiment, when the first horizontal imaginary line L11, the second horizontal imaginary line L12, and the third imaginary line L13 are set, a reduction portion 152 is formed between the first horizontal imaginary line L11 and the second horizontal imaginary line L12, where the height H of the vertical cross-section of the third imaginary line L13, which is orthogonal to the flow line F1 of the flushing water, is less than its downstream side. The first horizontal imaginary line L11 is a line extending forward from the connection portion 148 (position P14) between the downcomer pipe 130 and the rear side of the basin 108. The second imaginary horizontal line L12 is located lower than the first imaginary horizontal line L11 and extends forward from the top 150a of the connection 150 between the downcomer pipe 130 and the riser pipe 132. The third imaginary line L13 extends from the top 130a of the downcomer pipe 130 along the flow line F11 of the cleaning water. Therefore, when the waste W is flushed out with the cleaning water, the phenomenon of water pressure weakening (pressure loss) as the cleaning water flows under the waste can be prevented, and a larger water pressure (surface pressure) PA can be applied to the waste W. Therefore, according to the flush toilet 1 of this embodiment, the cleaning performance can be suppressed by effectively utilizing the water flow of the cleaning water. Moreover, even when the reducing part 152 is provided in the downcomer pipe 130, the water pressure weakening around the waste W after the waste W enters the downcomer pipe 130 can be suppressed, thus preventing the cause of blockage and preventing the decrease in cleaning performance (effective utilization of the water flow of the cleaning water).

[0207] Next, according to the flush toilet 1 of this embodiment, the reducing part 152 is provided on the bottom surface 134 of the front area of ​​the pot-shaped part 118 of the basin part 106 connected to the downpipe 130 or on the side of the front side of the downpipe 130. It is formed by a first arc surface (corresponding to the rear side arc surface 134b) protruding toward the center side of the downpipe 130. Therefore, it can guide the waste toward the center of the downpipe 130 and prevent the water pressure from weakening from below the waste.

[0208] Next, according to the flush toilet 100 of this embodiment, the top of the first arc surface, namely the rear side arc surface 134b, is located between the first horizontal imaginary line L11 and the second horizontal imaginary line L12. Therefore, at the top of the rear side arc surface 134b, it is possible to prevent the water pressure from weakening around the dirt, thereby effectively utilizing the water flow of the cleaning water and preventing the cleaning performance from declining.

[0209] Next, according to the flush toilet 100 of this embodiment, the connection 148 between the downpipe 130 and the rear side of the basin 106 is formed by a rear arc portion 136 protruding toward the center side of the basin 106. Therefore, it is possible to prevent the pressure of the cleaning water from the rear side of the waste W, thereby effectively utilizing the water flow of the cleaning water and preventing the cleaning performance from declining.

[0210] Next, according to the flush toilet 100 of this embodiment, the rear arc portion 136 is positioned closer to the top than the first arc portion, i.e., the rear side arc surface 134b. Therefore, it is possible to prevent a significant reduction in the height of the vertical cross-section of the downcomer 130, and at the same time, to prevent the pressure of the flushing water from being released.

[0211] Next, according to the flush toilet 100 of this embodiment, a second arc surface, namely the front arc surface 134a, protruding toward the center side of the basin 106 is provided on the bottom surface 134 of the water accumulation part, namely the pot-shaped part 118. Therefore, the waste W can be smoothly guided from the front arc surface 134a to the first arc surface, namely the rear arc surface 134b.

[0212] Next, according to the flush toilet 100 of this embodiment, the rear side arc surface 134b and the front side arc surface 134a are continuously provided. The radius of curvature R12 of the rear side arc surface 134b is set to be greater than the radius of curvature R11 of the front side arc surface 134a. Therefore, a portion of the cleaning water flowing along the front side arc surface 134a of the water accumulation part, i.e. the pot-shaped part 114, can be separated by the rear side arc surface 134b. The cleaning water and dirt can be guided to the center of the downcomer 30, and the surface pressure (water pressure) can be increased to discharge the dirt.

Claims

1. A flushing toilet that flushes and removes waste using flushing water, characterized in that: It has: a basin portion, a basin-shaped waste receiving surface and an inner edge portion formed above the waste receiving surface, and a pot-shaped portion provided below the waste receiving surface and forming a water collection portion by accumulating water. A water discharge section is provided on the inner edge to discharge cleaning water into the basin. The system includes a drain pipe with an inlet connected to the lower part of the basin to discharge waste from the basin. The pot-shaped portion includes: a bottom wall formed above and in front of the inlet of the drain bend; a side wall formed to surround the bottom wall; and a joint that joins the outer edge of the bottom wall and the lower edge of the side wall by means of a curved surface. The bottom wall of the pot-shaped portion includes: an inclined portion formed over its left and right spans relative to its left and right central axes; and a guide portion formed on the left and right outer sides of the inclined portion, which guides cleaning water or waste from the front toward the inlet of the drain bend pipe. When viewed in cross-section from the front, the guide portion is formed in a convex shape upwards, and the inclined portion is formed in a concave shape downwards from the lower ends of the left and right inner sides of the guide portion. When viewed in cross-section from the side, the inclined portion is formed as a whole upward convex shape, while tilting downward from the front toward the inlet of the drainage bend.

2. The flushing toilet according to claim 1, characterized in that, The inclined portion is configured such that, when viewed in cross-section from the front, the amount of concavity in the vertical direction from its upper end to its lowest bottom surface increases with the inlet side of the drainage bend pipe facing rearward.

3. The flushing toilet according to claim 1, characterized in that, The inclined portion is configured such that, when viewed from above, its width in the left and right directions increases with the inlet side of the drainage bend pipe facing backward.

4. The flushing toilet according to claim 1, characterized in that, The bottom wall of the pot-shaped portion also has a rear bottom surface that protrudes forward from the rear side of the water accumulation portion, and the rear bottom surface is configured to guide the washing water in the rear side of the pot-shaped portion forward.

5. The flush toilet according to claim 4, characterized in that, when viewed in cross-section from the side, the apex of the upwardly convex portion of the inclined part is located within the height range between the upper and lower ends of the rear bottom surface.

6. The flushing toilet according to claim 1, characterized in that, When viewed in cross section from the side, the upward convex portion of the inclined section is formed by a curved surface, and its overall shape is such that it slopes downward from the front area of ​​the water accumulation section to the inlet of the drainage bend.

7. The flushing toilet according to claim 1, characterized in that, The drainage bend includes a downpipe extending downward from the basin and an uppipe connected to the downpipe and extending upward from the downpipe. The downcomer has the inlet and the outlet formed at the connection with the upcomer. The rising pipeline has an inlet formed at the connection with the falling pipeline and an outlet formed on the downstream side. When the first, second, and third imaginary horizontal lines are set, a reduction portion is formed between the first and second imaginary horizontal lines, where the height of the vertical cross-section perpendicular to the flow line of the cleaning water is less than that on the downstream side. The first imaginary horizontal line extends forward from the connection between the downpipe and the rear side of the basin. The second imaginary horizontal line is located closer to the bottom than the first imaginary horizontal line and extends forward from the top of the connection between the downpipe and the riser. The third imaginary line extends from the top of the downpipe along the flow line of the cleaning water.

8. The flushing toilet according to claim 7, characterized in that, The reduction section is disposed on the bottom surface of the front region of the basin connected to the downcomer or on the side surface of the front side of the downcomer, and is formed by a first arc surface protruding toward the center side of the downcomer.

9. The flushing toilet according to claim 8, characterized in that, The top of the first arc surface is positioned between the first horizontal imaginary line and the second horizontal imaginary line.

10. The flushing toilet according to claim 7, characterized in that, The connection between the downcomer and the rear side of the basin is formed by a rear arc portion protruding toward the center of the basin.

11. The flushing toilet according to claim 10, characterized in that, The reduction section is formed by a first arcuate surface protruding toward the center side of the downduct, and the rear arcuate section is positioned closer to the top than the first arcuate surface.

12. The flushing toilet according to claim 7, characterized in that, The basin has a waste receiving surface and a water collection part located below the waste receiving surface. A second arc surface protruding toward the center of the basin is provided on the bottom surface of the water collection part.

13. The flushing toilet according to claim 12, characterized in that, The reduction section is formed by a first arc surface protruding toward the center side of the downduct, the first arc surface and the second arc surface are continuously arranged, and the radius of curvature of the first arc surface is set to be greater than the radius of curvature of the second arc surface.

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