Flush toilet

Abstract

The invention discloses a bowl-shaped structure for a closestool and the closestool, and the bowl-shaped structure comprises a closestool bowl part which comprises an edge; and a shelf located below the rim and connected to at least one fluid passageway, where the rim and the shelf together form an embedded channel extending in a flow direction along a perimeter of the toilet bowl, and the height of the embedding channel between the edge and the shelf is reduced in the flow direction.

Description

[0001] This application is a divisional application of the invention patent application with Chinese application number "201910931703.9", application date "September 29, 2019", and applicant "Kohler Company" and the invention name "Flush Toilet".

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application claims the benefit of and priority to U.S. Provisional Application No. 62 / 738,428, filed on September 28, 2018, and U.S. Non-Provisional Application No. 16 / 582,616, filed on September 25, 2019, the entire disclosures of which are incorporated herein by reference. Technical Field

[0004] The present application generally relates to the field of toilets. More specifically, the present application relates to a toilet having a flush structure that improves the overall flushing efficiency of the toilet. Background Art

[0005] In the field of toilets (and other water-using appliances), there is a continuing desire and need to, for example, become more efficient and use less water during each flush cycle, which is very similar to the desire to improve the fuel efficiency of internal combustion engines. Also similar to a slight improvement in the fuel efficiency of an engine, even a slight improvement in the flushing efficiency of a toilet can have a huge impact on water conservation (i.e., reducing the amount of water consumed), given the number of toilets used and flush cycles used every day (not just in the United States, but around the world). Therefore, there is a constant pressure to find new ways to improve flushing efficiency, even if only minor improvements can be achieved. Despite the constant pressure to increase flushing efficiency and reduce the amount of water consumed, such improvements are easier said than done.

[0006] Furthermore, providing a proper flush so that all of the contents of the toilet bowl (e.g., solid waste, liquid waste, etc.) are removed from the toilet bowl in a single flush is a competing interest of improving flush efficiency and reducing water usage. Current toilets designed to use 1 gallon of water per flush provide poor overall flush performance (e.g., leaving contents in the toilet bowl after the first flush), which results in customer dissatisfaction and frequent additional flushes to completely remove the contents from the toilet bowl, thus preventing efficiency improvements by requiring multiple flushes to achieve a proper flush. Summary of the invention

[0007] At least one exemplary embodiment of the present application relates to a toilet having an inlet structure, a bowl structure, and an outlet structure. The inlet structure is configured to receive water. The bowl structure has a toilet bowl, a separator, a shelf, a side channel, and a diverter, wherein the toilet bowl includes a rim and a sump; the separator is fluidly connected to the inlet structure and includes a first passage and a second passage; the shelf is located below the rim of the toilet bowl and is fluidly connected to the first passage; the side channel is fluidly connected to the second passage; and the diverter redirects water from the side channel to the sump of the toilet bowl. The outlet structure is fluidly connected to the sump and is configured to discharge water from the sump into a drain pipe.

[0008] Another exemplary embodiment of the present application relates to another toilet including an inlet structure, a bowl structure and an outlet structure. The inlet structure includes an inlet configured to receive water, a horizontal portion and an elbow connecting the inlet fluid to the horizontal portion. The elbow includes a fracture radius and has a circular cross-sectional shape. The bowl structure includes a toilet bowl having an edge and a groove, a separator located downstream of the horizontal portion and having a first passage and a second passage, a shelf located below the edge and fluidly connected to the first passage, a side channel fluidly connected to the second passage, and a diverter redirecting water from the side channel to the inlet of the groove. The outlet structure includes a drain channel, which is fluidly connected to the groove and has an outlet.

[0009] Another exemplary embodiment of the present application is directed to a toilet including a toilet bowl and a shelf. The toilet bowl includes a rim. The shelf is located below the rim and spaced from the rim. The rim and the shelf together form an inset channel extending along at least a portion of the periphery of the toilet bowl. The height of the inset channel between the rim and the shelf decreases continuously in the flow direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a side view of a toilet flush structure in a computational fluid dynamics (CFD) model showing velocity streamlines associated with efficiency, according to an exemplary embodiment.

[0011] Figure 2 yes Figure 1 A rear perspective view of the toilet flush structure shown in the CFD model.

[0012] Figure 3 yes Figure 1 A bottom view of the toilet flush structure shown in the CFD model.

[0013] Figure 4 is a bottom view of another toilet flush structure in a CFD model according to an exemplary embodiment.

[0014] Figure 5 It is a perspective view of a portion of the shelf of the bowl portion.

[0015] Figure 6 It is along Figure 1 Cross-sectional view of the drain casting inlet taken along line AA.

[0016] Figure 7 is a cross-sectional view of an alternative inlet.

[0017] Figure 8 is a top perspective view of a toilet including a whirlpool flush rim structure according to an exemplary embodiment.

[0018] Fig. 9 yes Figure 8 Top view of the toilet in the.

[0019] Fig.10 yes Figure 8 Panoramic view of the whirlpool flush rim structure of a toilet bowl.

[0020] Fig.11 yes Figure 8 A side cross-sectional view of a toilet bowl in the area of ​​the vortex flush rim structure.

[0021] Fig.12 is a side cross-sectional view of a rim area of ​​a toilet having a constant height along the perimeter of the toilet according to an exemplary embodiment.

[0022] Fig.13 is a panoramic view of a whirlpool flushing rim structure configured as a toilet according to another exemplary embodiment. DETAILED DESCRIPTION

[0023] Referring generally to the accompanying drawings, a toilet having a flushing structure that improves the overall flushing efficiency of the toilet is disclosed herein. That is, the flushing structure enables the toilet to properly flush the contents of the toilet using less water. For example, the toilet is configured to flush the contents of the toilet using a single flush, each flush containing 1 gallon of water or less (1.0 gpf). In this way, the toilet of the present application can completely remove the contents of the bowl using a single flush cycle of reduced capacity (e.g., using 1.0 gpf or less water).

[0024] Figures 1 to 3An exemplary embodiment of a flush structure of a toilet 1 is shown, wherein streamlines (e.g., velocity streamlines) pass through the flush structure. The streamlines are modeled on a computer using a CFD model for the purpose of evaluating the flushing efficiency of a new structure, for example, by comparing the streamlines with streamlines in other toilet flush structures. CFD streamlines are related to efficiency. For example, a decrease in a velocity streamline can indicate a drop / reduction in fluid pressure or energy, which indicates a loss in efficiency. Additionally, for example, vortices and turbulence in the streamlines can indicate a drop in fluid pressure or energy. By customizing the flush structure to reduce velocity drops and turbulence, the overall efficiency of the toilet flushing system can be improved.

[0025] The flushing structure shown includes an inlet structure 2, a bowl structure 4, and an outlet structure 6. The inlet structure 2 receives water from a source such as a water tank and delivers the water to the bowl structure 4. The bowl structure 4 is configured to direct the water received from the inlet structure 2 into the bowl to wash the contents in the bowl to the outlet of the toilet 1 and clean the interior surface (e.g., the inner surface) of the bowl. The outlet structure 6 is configured to direct the water and contents in the bowl of the toilet 1 to a drain or other sewage pipe.

[0026] The inlet structure 2 shown delivers flush water to the bowl structure 4 and includes an inlet 17 ( Figure 2 The inlet 17 may be connected to (or include) a flush valve (not shown) that controls the flow rate (e.g., volume and timing) of flush water entering the inlet structure 2 when a flush cycle of the toilet 1 is initiated. The inlet 17 shown generally extends downward (e.g., vertically) to the curved portion 12 ( Figure 1 As shown in the figure, the bend 12 has a breaking radius, which is conducive to the complete discharge of air, and the bend is not a sharp break or turn, because the air will be trapped. As a non-limiting example, the breaking radius of the bend 12 is about 0.75 inches (3 / 4") at the inner diameter. As shown in the figure, the horizontal portion 10 (as shown in the figure) Figure 1 The casting inlet structure shown (e.g., Figure 6 The inlet 17 shown is configured to have a generally circular cross-sectional shape, which improves the inlet (e.g. Figure 7 The invention also provides an improvement in flow efficiency over an inlet 17 shown in FIG. 1 , which has a "U" or "D" cross-sectional shape that is necessitated by current processes (e.g., manufacturing). New processes such as the "edge tiling" process allow the inlet structure (e.g., inlet 17, horizontal portion 10, etc.) to have a generally circular shape. In addition, due to the efficiency gain and the circular cross-sectional shape, the size (e.g., diameter) of the drain casting inlet structure can be reduced. Although Figures 1 to 3 The embodiments show a drain casting glass inlet structure, but it should be understood that other materials and manufacturing processes are also included within the scope of the present disclosure.

[0027] The bowl-shaped structure 4 includes a separator 20 (such as Figure 1 2 ), the separator 20 is located downstream of the horizontal portion 10 of the inlet structure 2, wherein the separator 20 includes a first passage 22 and a second passage 23. The first passage 22 (or upper passage) leads to the fluvial terrace or shelf 16 (also at Figure 1 and Figure 5 ), the river terrace or shelf 16 is located around the inside of the top of the bowl and at the edge 14 (at Figure 5 The edge 14 does not include a closed edge channel, fluid channel or other fluid conveying or water transporting feature. That is, the edge 14 shown is a solid planar member suspended from the shelf 16 (see Figure 5 ).like Figure 5 As shown, the shelf 16 is configured to direct the flushing water in a single direction (eg, clockwise or counterclockwise, depending on the location of the shelf inlet 24) around the shelf 16 and the bowl, thereby performing a vortex flushing. Figure 5 As shown, shelf 16 has a compound radius starting from shelf inlet 24, wherein the compound radius includes inner diameter 28 and radius 30 entering the bowl. According to one example, inner diameter 28 is approximately 0.25 inches (1 / 4") and outer radius 30 entering the bowl is approximately 0.75 inches (3 / 4"), wherein the inner diameter and outer diameter remain substantially constant around the bowl. The combination of inner diameter 28 and outer diameter 30 (e.g., rupture radius) entering the bowl, together with the shelf width, defines a variable water outflow rate around the perimeter of toilet 1. In addition, shelf 16 is elevated in the bowl relative to first passage 22 or upper passage (e.g., the central axis of first passage 22). That is, the water supply 18 (e.g., from first passage 22 to shelf 16) is Figure 1 16. This advantageously prevents makeup water from entering the bowl through shelf 16, particularly when makeup water continues to flow, such as from a leak valve, which eliminates excess makeup water from leaving stains or streaks in the bowl below shelf 16. Instead, any excess makeup water is drained into second passage 23 and into the trough through an opening therein.

[0028] The bowl structure 4 including the shelf 16 is configured to maximize coverage of the inner or interior surfaces of the bowl with water during a flush cycle while using as little water as possible during each flush cycle. According to one example, the toilet 1 is configured to divert approximately 15-30% of the total flush water (e.g., 0.15 to 0.30 gallons for a 1-gallon flush) to the first passage 22 (e.g., the upper passage). Delivering less than 15% of the total flush water through a closed rim channel (for other toilets) or an upper passage (e.g., for the toilet of the present application) results in suboptimal (e.g., intermittent) coverage of the interior surfaces of the bowl, while delivering too much (e.g., 50% or more) water through the rim or upper passage results in poor overall flushing performance.

[0029] like Figure 1 As shown, the second passage 23 (e.g., lower passage) leads to the lower portion (e.g., trough) of the bowl after passing through one or more side channels and the diverter 13 in the trough or "pug" of the toilet bowl. Figure 2 and Figure 3 As best shown in FIG. 1 , the toilet (e.g., bowl structure) shown includes a dual channel structure having a right channel (RSC) 32 extending downwardly from the separator 20 around the right side of the bowl and a left channel (LSC) 34 extending downwardly from the separator 20 around the left side of the bowl. Thus, each of the RSC 32 and the LSC 34 does not extend within the bowl, but rather extends around the exterior of the bowl. Figure 3 As shown, each side channel has a slightly arcuate shape (when viewed from below), and the RSC 32 and LSC 34 are symmetrically opposed about the central longitudinal axis 36 (e.g., from the diverter 13 through the opening into the bowl). A single-channel toilet can include the RSC 32 or the LSC 34. According to one example, the toilet 1 is configured to divert approximately 60-75% of the total flush water (e.g., 0.60-0.75 gallons for a 1-gallon flush system). Flush system) to the second passage 23 (e.g., the lower passage) and through one or more side channels.

[0030] Figure 3 The diverter 13 (e.g., a diverter plate) shown is configured to re-converge water from the RSC 32 and LSC 34 before the water entering the trough of the bowl enters the bowl through the lower opening (e.g., trough jets, trough openings, etc.). That is, the diverter 13 takes the two circulating flows through the RSC 32 and LSC 34 and converges the two circulating flows into a single straight flow into the bowl. Figure 3 As shown, the diverter 13 includes an inward (eg, concave) protrusion 38 or depression at the front of the diverter 13 that forms a generally "W" shape with the RSC 32 and LSC 34 and the lower opening to the slot. Figure 4This arrangement reduces eddy currents and turbulences of the converging streamlines compared to designs shown having a rounded front portion 138 without a depression (such as toilet 103), which results in significant eddy currents and turbulences that result in energy losses and, thus, reduced flushing efficiency.

[0031] Back to Figure 1 , the outlet structure 6 of the bowl includes a trapway 15 having a variable size (e.g., diameter) along its length. The trapway 15 includes an upper tube 40 extending upwardly and rearwardly from the trough of the bowl to a weir or dam, a lower tube 42 extending downwardly from the dam, and an outer tube 44 extending forwardly from the downstream end of the lower tube 42 to the outlet 19 of the toilet. According to one example, the upper tube 40 of the trapway 15 has a generally common size (e.g., a diameter of 2.125 inches), the lower tube 42 and the outer tube 44 of the trapway 15 each have approximately the same size (e.g., a diameter of 2.000 inches or less), and the outlet 19 has a diameter of 2.00 inches-2.50 inches. The outlet 19 shown extends forwardly and downwardly at an angle of 10°-20° (10 degrees-20 degrees). This variable size arrangement of the trapway 15 is configured to set up the siphon more quickly, as well as provide faster priming and a faster, longer siphon during each flush cycle. Furthermore, the configuration of outlet 19 increases the discharge flow rate by 15% or more. In contrast, a 90° (90 degree) turn (at the outlet) causes water to impact the walls of the trapway and results in energy loss during the flush cycle.

[0032] The geometry and arrangement of the inlet structure, bowl structure and outlet structure are for illustrative purposes only. It should be understood that various replacements and combinations are possible without departing from the inventive concepts disclosed herein. For example, in some exemplary embodiments, the geometry of the shelf and / or edge can be changed to further improve the flushing efficiency. Figures 8 to 11 A toilet 200 is shown according to an exemplary embodiment, which includes a variable height swirl flushing rim structure, shown as rim structure 202. In other embodiments, rim structure 202 may be incorporated as Figures 1 to 3 Part of toilet 1.

[0033] like Figure 8As shown, the edge structure 202 includes a shelf 216 (e.g., a river terrace, a lower ledge, etc.) located along the upper area of ​​the toilet bowl, along the upper portion of the waste receiving surface 246 of the toilet bowl. In addition, the edge structure 202 includes a rim 214 (e.g., a ceiling, etc.) that is disposed on the top of the toilet bowl, above the shelf 216. The rim 214 forms the upper surface of the toilet bowl. The rim 214 extends inwardly from the outer periphery of the toilet bowl, thereby overhanging the shelf 216. The shelf 216 and the rim 214 together form an embedded channel 248 extending along the periphery of the toilet bowl (e.g., the waste receiving surface 246).

[0034] The shelf 216 is configured to direct the flushing water in a single direction (e.g., clockwise or counterclockwise, depending on the direction in which the water is received within the shelf 216) around the perimeter of the shelf 216 and the waste receiving surface 246, resulting in a vortex or eddy flow pattern (i.e., vortex flushing). In various exemplary embodiments, the shelf 216 has a compound radius that can be shaped similar to the compound radius of the waste receiving surface 246. Figures 1 to 3 The radius of the toilet bowl 1 is the same or similar. Fig. 9 As shown, the toilet 200 also includes a shelf inlet 224 that is configured to direct water from at least one of a flush tank (not shown) of the toilet 200 or a water supply line connected to the inlet of the toilet 200 to the embedded channel 248. For example, the shelf inlet 224 can form a portion of the first passage (e.g., the upper passage) extending downstream from the inlet structure of the toilet 200, as shown in reference Figures 1 to 3 The toilet as described in 1.

[0035] The rim structure 202 is configured to improve water coverage along the perimeter of the toilet bowl during a flush without increasing the amount of water provided to the inlay channel 248 via the shelf inlet 224 . Fig. 9 A top view of a toilet 200 is shown, wherein the edge structure 202 is divided into a plurality of sections along the perimeter of the toilet bowl, each section forming a 1 / 4 portion of the overall perimeter of the toilet bowl. Water enters the embedded channel 248 at section A through the shelf inlet 224 and flows from section A to sections B, C, and D in sequence (e.g., clockwise, etc.) along the perimeter. Fig.10 A panoramic side view from inside the toilet bowl is shown in the area of ​​the embedded channel 248. Figure 8 and Fig.10 As shown, the height of the inlay channel 248 between the edge 214 and the shelf 216 varies continuously along the length of the inlay channel 248 (e.g., along the perimeter of the waste receiving surface 246). In particular, the height of the inlay channel 248 decreases continuously along the length of the inlay channel 248 in the flow direction 249 along the length of the inlay channel 248. Fig.10As shown, the upper surface 250 of the shelf 216 is generally horizontal (e.g., equidistant from the groove of the toilet bowl along the perimeter of the waste receiving surface 246). The lower surface 252 of the edge 214 is inclined downwardly toward the shelf 216 (e.g., tapered), so that the lower surface 252 of the edge 214 and the upper surface 250 of the shelf 216 converge with each other in the flow direction 249. In other embodiments, the shelf 216 can be inclined upwardly toward the edge 214 along the length of the embedded channel 248 in the flow direction 249. In some other embodiments, the edge 214 and the shelf 216 can be inclined toward each other (e.g., the edge 214 and the shelf 216 can be at an angle relative to the horizontal plane extending through the toilet bowl and / or the upper surface / edge 214 of the toilet bowl). In various exemplary embodiments, the height 254 of the embedded channel 248 between the edge 214 and the shelf 216 can vary in the range between about 0.5 inches and 1 inch.

[0036] Fig.11 A cross-sectional view through the insert channel 248 during a flushing operation is shown. Fig.12 A cross-sectional view through an inset channel 348 of another toilet 300 is shown, wherein the height of the inset channel 348 (between the rim and the shelf) is constant along the perimeter of the toilet bowl. Fig.11 The height 254 of the inlay channel 248 of the toilet 200 at any location along the perimeter of the toilet bowl may be less than Fig.12 According to various exemplary embodiments, the height of the embedment channel 248 may differ by a factor of two or more. Among other benefits, reducing the height of the embedment channel 248 reduces the vertical space in which water can flow upward along the inner surface 256 of the embedment channel 248, which reduces fluid losses in the flow direction (e.g., Fig.11 and Fig.12 In comparison, Fig.12 248, thereby enabling the fluid to travel a longer distance through the inset channel 248 before flowing down the trough portion of the toilet bowl along the waste receiving surface 246. The reduction in fluid losses along the inset channel 248 is accompanied by a reduction in the amount of fluid required to maintain a full 360° vortex (e.g., eddy) along the perimeter of the toilet bowl (e.g., along the inset channel 248). For a toilet bowl that is circumferentially smaller than the inset channel 248, the inset channel 248 is more efficient than the inset channel 248. Figures 8 to 11At least some of the benefits observed with toilet 200 may also be achieved by selectively reducing the height of the embed channel in certain areas along the perimeter of the toilet bowl; for example, by first selectively reducing the height of the embed channel and then reducing the sharp curve along the perimeter of the toilet bowl (e.g., in an area near the front of the toilet bowl). Fig.13 An example of an embedding channel 438 of another edge structure 402 according to an exemplary embodiment is shown. Fig.13 As shown, the insertion channel 438 includes two parts, a first part 460 and a second part 462, the first part 460 extending between the shelf entrance (on the left side of segment A) and the front area through the central axis of the toilet bowl (between segments B and C), and the second part 462 extending between the front area and the downstream end of the insertion channel 438 (between segments D and A). The height 464 of the first part 460 is substantially constant along the length of the first part 460, while the height 466 of the second part 462 continuously decreases along the length of the second part 462.

[0037] As used herein, the terms "approximately," "about," "substantially," and similar terms are intended to have a broad meaning consistent with common and recognized usage by those of ordinary skill in the art to which the subject matter to which this disclosure relates. It should be understood by those skilled in the art who read this disclosure that these terms are intended to allow for the description of certain features described and claimed without limiting the scope of these features to the precise numerical ranges provided. Therefore, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or alterations of the subject matter described and claimed are considered to be within the scope of the disclosure as described in the appended claims.

[0038] It should be noted that the term "exemplary" and variations thereof used herein to describe various embodiments are intended to indicate that these embodiments are possible examples, representations and / or illustrations of possible embodiments (and these terms do not imply that these embodiments are necessarily the most or most advanced examples).

[0039] As used herein, the term "coupled" refers to the direct or indirect engagement of two components with one another. Such engagement may be static (e.g., permanent or fixed) or movable (e.g., removable or releasable). Such engagement may be achieved by the two components being directly coupled to one another, the two components being coupled to one another using a separate intervening component and any additional intermediate components, or the two components being coupled to one another using an intervening component that is integrally formed as a single unitary body with one of the two components. The components may be coupled mechanically, electrically, and / or fluidly.

[0040] As used herein, the term "or" is used in its inclusive sense (rather than an exclusive sense), so when used, for example, to connect a list of elements, the term "or" means one element, some elements, or all elements in the list. Unless otherwise specifically stated, joint language such as the phrase "at least one of X, Y, and Z" is understood to mean that the element can be X, or Y, or Z, X and Y, X and Z, Y and Z, or X, Y and Z (i.e., any combination of X, Y, and Z). Therefore, unless otherwise stated, such joint language does not generally mean that certain embodiments require that at least one X, at least one Y, and at least one Z each be present.

[0041] The element positions (e.g., "top", "bottom", "above", "below", etc.) mentioned herein are only used to describe the orientation of the various elements in the figures. It should be noted that according to other exemplary embodiments, the orientation of the various elements may be different, and these variations are intended to be covered by the present disclosure.

[0042] Although the drawings and descriptions may describe a particular order of method steps, unless otherwise specified above, the order of these steps may be different from the order set forth and described. In addition, unless otherwise specified above, two or more steps may be performed simultaneously or partially simultaneously. Such variations may depend on, for example, the software and hardware systems selected and the designer's choice. All of these variations are within the scope of the present disclosure. Similarly, software implementations of the method may be accomplished with standard programming techniques having rule-based logic and other logic to accomplish various connection steps, processing steps, comparison steps, and decision steps.

[0043] It is important to note that the construction and arrangement of the toilet and components / elements as shown in the various exemplary embodiments are schematic only. In addition, any element disclosed in one embodiment may be combined or used with any other embodiment disclosed herein. For example, each inlet structure or component thereof, each bowl-shaped structure or component thereof, and / or each outlet structure or component thereof described herein may be incorporated into any other embodiment of the present application. Although only one example of an element that may be combined or utilized in another embodiment in one embodiment is described above, it should be understood that other elements of the various embodiments may be combined or utilized with any other embodiment disclosed herein.

Claims

1. A bowl-shaped structure for a toilet, comprising: The toilet bowl, including the rim; as well as a shelf located below the edge and connected to at least one fluid passage, The edge and the shelf together form an embedding channel, which extends along the periphery of the toilet bowl in a flow direction, and the height of the embedding channel between the edge and the shelf decreases in the flow direction.

2. The bowl structure of claim 1, wherein the inset channel opens into a waste receiving surface of the toilet bowl. 3 . The bowl-shaped structure of claim 1 , wherein a height of the embedded channel is configured to reduce fluid loss in the flow direction.

4. The bowl-shaped structure of claim 1, wherein the height of the embedded channel is configured to allow fluid to move a longer distance through the embedded channel.

5. The bowl structure of claim 1, wherein the height of the embedded channel is configured to allow for a reduction in the amount of fluid required to maintain a vortex along the perimeter of the toilet bowl.

6. The bowl structure of claim 1, wherein the height of the embedment channel is configured to selectively decrease along a sharp curve of a periphery near a front area of ​​the toilet bowl.

7. The bowl structure of claim 1, wherein the embedment channel includes a first portion extending between the shelf and a front region passing through a central axis of the toilet bowl.

8. The bowl-shaped structure of claim 7, wherein the embedment channel includes a second portion extending between the front region and a downstream end of the embedment channel.

9. The bowl-shaped structure of claim 8, wherein the height of the first portion is substantially constant along the length of the first portion.

10. The bowl-shaped structure of claim 8, wherein the height of the second portion decreases continuously along the length of the second portion.

11. A toilet, comprising: a toilet bowl having a rim; as well as a shelf located below and spaced from the edge, The rim and the shelf together form an embedding channel, the embedding channel extends along at least a portion of the periphery of the toilet bowl, and the height of the embedding channel between the rim and the shelf decreases along a flow direction.

12. The toilet of claim 11, wherein the height of the embedment channel decreases at a constant rate along the entire length of the embedment channel.

13. A toilet according to claim 11, wherein the embedment channel includes a first portion extending between the shelf and a front area and a second portion extending between the front area and a downstream end of the embedment channel, the front area passing through a central axis of the toilet bowl, wherein the height of the first portion is substantially constant along the length of the first portion.

14. The toilet according to claim 11, further comprising: an inlet structure configured to receive water; a separator fluidly connected to the inlet structure and comprising a first passage and a second passage, the shelf being fluidly connected to the first passage; a first side channel connected to the second passageway and extending downwardly from the separator around a first side of the toilet bowl; A second side channel extends downwardly around a second side of the toilet bowl opposite the first side.

15. The toilet of claim 14, wherein the first side channel and the second side channel are both arcuate and symmetrical to each other about a central longitudinal axis passing through the toilet bowl.

16. The toilet according to claim 14 further includes a diverter that redirects fluid from the first side channel to the groove portion of the toilet bowl, and the diverter includes an inward recess between the first side channel and the second side channel, and wherein the inward recess forms a generally "W" shape.

17. The toilet according to claim 16, further comprising an outlet structure, wherein the outlet structure is fluidically connected to the trough portion and is configured to discharge fluid from the trough portion into a drain pipe, the outlet structure comprising a drainage channel fluidly connected to the toilet bowl, wherein the drainage channel comprises an upper pipe, a lower pipe and an outer pipe, the upper pipe extending upward and backward from the trough portion of the toilet bowl to a dam, the lower pipe extending downward from the dam, and the outer pipe extending forward from the downstream end of the lower pipe to the outlet of the toilet.

18. The toilet according to claim 17, wherein a diameter of the upper pipe of the trapway is larger than a diameter of the lower pipe and a diameter of the outer pipe, and the diameters of the lower pipe and the outer pipe are the same.

19. The toilet according to claim 14, wherein the inlet structure includes an inlet for receiving water, a horizontal portion, and a curved portion fluidly connecting the inlet and the horizontal portion, and wherein the curved portion has a break radius and a circular cross-sectional shape.

20. The toilet according to claim 14, further comprising a water supply portion located between the first passage and the shelf, the water supply portion moving obliquely upward from a downstream of the first passage to the shelf so that the shelf rises relative to a central axis of the first passage.

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