Toilet

Abstract

The present invention relates to the field of bathroom facilities, and specifically relates to a toilet, comprising a bowl and a pipe connected to the bowl. The bowl comprises a waste dropping port arranged at the bottom thereof, and a jet port is provided below the waste dropping port. The pipe comprises a pipe port, and an ascending section, a descending section and a waste discharge section, which are connected end to end in sequence, the junction of the ascending section and the descending section being the highest point of the two sections. The jet port directly faces the pipe port. In the direction of water flow, the pipe diameters of the ascending section and the descending section each decrease gradually. The ratio of the cross-sectional area of the pipe port to the area of a first cross-section between the ascending section and the descending section ranges from 1: 0.52 to 1: 0.72, and the ratio of the cross-sectional area of the pipe port to the area of a second cross-section between the descending section and the waste discharge section ranges from 1: 0.53 to 1: 0.63. The pipe set to this ratio can quickly discharge more flushing waste, thereby improving the flushing capability of the toilet; moreover, the increased pipe diameter can reduce blockage.

Description

toilet

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese patent applications 202510125162.6, 202520175348.8 and 202510125031.8, filed on January 27, 2025, the contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of bathroom facilities, and more specifically to a toilet. Background Technology

[0004] In the bathroom fixtures industry, the flushing power and other performance characteristics of toilets have always been key concerns for consumers. Traditional direct-flush toilets directly flush away waste with a stream of water, which, while effective, consumes a significant amount of water. Furthermore, the high-speed, direct-flush flow generates considerable noise, and the small water slick within the bowl results in poor odor control. These issues have led to direct-flush toilets being gradually replaced by more efficient designs in the modern market.

[0005] To overcome the aforementioned drawbacks of direct-flush toilets, siphon toilets were developed. Siphon toilets utilize an inverted "U"-shaped pipe design at the bottom of the bowl. During flushing, water flows through the pipe, exceeding its highest point, creating negative pressure and a vacuum, thus generating a powerful siphon effect. This effect significantly enhances waste removal, ensuring that waste and water are quickly and thoroughly flushed away. Simultaneously, the higher water surface within the bowl covers more waste during flushing, resulting in better odor control. Furthermore, compared to direct-flush designs, siphon toilets are quieter during flushing, making them widely popular with consumers.

[0006] However, siphon toilets are not without their drawbacks. To conserve water, the diameter of the pipe in the trap is typically smaller. While this allows for a faster siphon effect, it also narrows the space for waste, making it more prone to clogging. Existing technologies attempt to improve water flow efficiency, shorten the time required to form the siphon effect, and extend its duration by optimizing the shape of the siphon pipe (such as incorporating a concave section at the rear or a multi-bend structure). However, these improvements offer limited enhancements to flush volume and suction power; the problem of insufficient flushing force remains unresolved when there is a large amount of waste or when the trap inlet is clogged.

[0007] With the development of intelligent technology, smart toilets have gradually become mainstream products in the market. Compared with traditional toilets, smart toilets not only improve the user experience but also place higher demands on flushing performance. Consumers expect smart toilets to save water resources while providing more efficient sewage disposal, especially in complex sewage scenarios, maintaining strong flushing effect and anti-clogging performance.

[0008] However, most existing smart toilet flushing systems are based on traditional siphon designs. While these systems are water-saving, their insufficient suction and flush volume limit their flushing capacity when there is a large accumulation of waste or blockage. Some smart toilets have attempted to introduce variable frequency pumps or segmented water flow control technology to improve flushing efficiency, but these solutions present a trade-off between maintaining technological advancement and practical feasibility. On the one hand, overly complex flushing systems increase product costs; on the other hand, the limitations of traditional pipe designs have not fundamentally solved the problem of insufficient space for waste to pass through. Therefore, optimizing the efficiency of the flushing system while meeting the demand for efficient waste disposal is the key direction for improving the flushing performance of smart toilets.

[0009] In existing technologies, to improve the flushing efficiency of smart toilets, a siphon-type toilet structure with a concave section and multiple bends has been proposed. This allows water to pass through the concave section more quickly than through a straight pipe, creating a siphon effect. This results in a siphon effect in the earlier flushing stage, and even when the water volume decreases in the later stages of flushing and is insufficient to fill the trap, the concave section in the pipe behind the trap can still be filled, thus extending the duration of the siphon effect. While existing technologies improve flushing efficiency through a faster siphon effect, they cannot provide a larger flush volume or higher suction power. Although a longer siphon duration theoretically removes more waste, in practical applications, when a large amount of waste needs to be flushed away, the waste often accumulates at the trap entrance. If the flush volume is small and the siphon force is weak, it will be difficult to dislodge the clogged waste. Even if the toilet flushing mechanism has a long enough flushing time, the flushing effect cannot be guaranteed if the flushing force is not strong enough to clear the blockage.

[0010] Therefore, a toilet that can provide high suction power is needed. Summary of the Invention

[0011] The purpose of this invention is to overcome the technical problem in the prior art of how to provide a toilet that can achieve better flushing effect with high suction power.

[0012] To solve the above-mentioned technical problems, the present invention provides a toilet, which includes a bucket and a pipe connected to the bucket.

[0013] The tank body includes a tank inlet at the top and a corresponding waste outlet at the bottom. A water outlet is located below the tank inlet, and a spray nozzle is located below the waste outlet.

[0014] The pipeline includes a pipe inlet and sequentially connected ascending, descending, and drain sections. The connection point between the ascending and descending sections is their highest point. The jet nozzles spray water directly into the pipe inlet to deliver water and flush away debris falling into the drain from the drain outlet. The diameters of the ascending and descending sections decrease along the water flow direction. The ratio of the cross-sectional area of ​​the pipe inlet to the area of ​​the first cross-section between the ascending and descending sections is 1:0.52–1:0.72, and the ratio of the cross-sectional area of ​​the pipe inlet to the area of ​​the second cross-section between the descending and drain sections is 1:0.53–1:0.63.

[0015] In some embodiments, the rising section is provided with a first area abrupt change section, and the sewage discharge section is provided with a second area abrupt change section.

[0016] In some embodiments, the cross-sectional area of ​​the first area abrupt change segment varies by 35%-40% before and after, and the cross-sectional area of ​​the second area abrupt change segment varies by 10%-20% before and after.

[0017] In some embodiments, the sewage discharge section has an inclination angle α of 1°-3° downward relative to the horizontal plane.

[0018] In some embodiments, the barrel body further includes a boss located above and adjacent to the drain outlet, the distance between the boss and the barrel body inlet on the horizontal plane being 305mm-335mm.

[0019] In some embodiments, the barrel body further includes a boss located above and adjacent to the drain outlet, the distance between the boss and the barrel body inlet on the horizontal plane being 255mm-285mm.

[0020] In some embodiments, the projected length of the water surface inside the tank on the horizontal plane is 200mm-230mm, the width d is 165mm-185mm, and the area is 280mm². 2 -330mm 2 .

[0021] In some embodiments, the height difference between the highest water level in the rising section and the bottom of the tank 1 is set to 110mm-130mm, so that the depth of the water surface inside the tank 1 is 110mm-130mm.

[0022] In some embodiments, the projected length of the drain outlet is 87mm-97mm, the width is 73mm-83mm, and the area is 57mm². 2 -73mm 2 .

[0023] In some embodiments, the pipe opening has a generally elliptical shape, but with more prominent upper left, lower left, upper right, and lower right sections. Specifically, it includes two symmetrically distributed arc segments at the left and right ends and two parallel straight segments at the upper and lower ends. Each arc segment smoothly connects to the ends of the straight segments. The radius of curvature of the arc segments is greater than half the cross-sectional height. The distance between the straight segments is equal to the cross-sectional width, which is 73mm-83mm, the cross-sectional height is 55mm-65mm, and the area is 35cm². 2 -45cm 2 .

[0024] In some embodiments, the barrel body further includes a pit section disposed below the sewage outlet and connected to the pipe outlet, and a spray nozzle is disposed on the side of the pit section opposite to the pipe outlet. The pit section includes two pit section sidewalls that are perpendicular to the horizontal plane and parallel to each other. The pit section sidewalls and the bottom of the barrel body form a pit section to limit the direction of water flow sprayed by the spray nozzle to be directly opposite the pipe outlet.

[0025] In some embodiments, the horizontal cross-section of the pit opening section has a length of 73mm-83mm, a width of 59mm-65mm, and a height of 40mm-48mm for the sidewall of the pit opening section.

[0026] In some embodiments, the toilet further includes a flushing system, which includes a water outlet device and an upper spray nozzle and a lower spray nozzle fluidly connected to the water outlet device. The upper spray nozzle is located on the inner wall of the toilet bowl at a position higher than the water surface level, and the lower spray nozzle is located in the spray nozzle. The spray direction of the lower spray nozzle is directly opposite the pipe opening to spray water into the pipe. During flushing, the flushing system is configured to perform the following flushing steps: Upward flushing stage S1: The water outlet device is configured to deliver a low water volume, making the water volume flowing out of the upper spray nozzle greater than the water volume flowing out of the lower spray nozzle, so as to raise the water surface level and rinse the inner surface of the toilet bowl; Simultaneous flushing stage S2: The water outlet device is configured to deliver a high water volume, making the water volume sprayed from the lower spray nozzle greater than the water volume sprayed from the upper spray nozzle, so as to push the waste and trigger a siphon; Replenishment stage S3: After the siphon effect ends, the water outlet device is configured to deliver a low water volume, making the water volume flowing out of the upper spray nozzle greater than the water volume flowing out of the lower spray nozzle, so as to rinse the inner surface of the toilet bowl again and restore the water surface level.

[0027] In some embodiments, the water outlet device includes a water tank and at least one water pump fluidly connected to the water tank, the water pump being fluidly connected to an upper nozzle and a lower nozzle, wherein the water tank is provided with an inlet valve for water intake.

[0028] In some embodiments, the water pump is configured as a variable frequency water pump capable of adjusting the flow rate of water passing through the pump within a certain time period by adjusting the rotation speed.

[0029] In some embodiments, the water outlet device includes at least one water distribution valve, which is fluidly connected to the upper nozzle and / or the lower nozzle.

[0030] In some embodiments, the water distribution valve is configured as an electrically operated water distribution valve capable of adjusting the ratio of water ejected from the upper nozzle and the lower nozzle.

[0031] In some embodiments, during the flushing process, the flushing time of the top flushing phase S1 is set to 2.5s-4s, and the flushing time of the same flushing phase S2 is set to 2.5s-3.2s.

[0032] In some embodiments, during the flushing process, the total water output in the top flushing stage S1 is set to 0.4L-0.6L, the total water output in the same flushing stage S2 is set to 2.5-2.9L, and the total water output in the replenishment stage S3 is set to 1.3L-1.9L.

[0033] In some embodiments, during the upward flushing stage S1, the ratio of the water output from the upper nozzle to the total water output during that stage is 60%-80%; during the simultaneous flushing stage S2, the ratio of the water output from the upper nozzle to the total water output during that stage is 0%-30%.

[0034] In some embodiments, during the top flushing stage S1, the average water flow rate of the water outlet device is set to 6L / min-14L / min; during the simultaneous flushing stage S2, the average water flow rate of the water outlet device is set to 50L / min-70L / min.

[0035] In some embodiments, during the upflushing phase S1, the maximum instantaneous flow rate of the water outlet device is set to 25L / min-35L / min; during the simultaneous flushing phase S2, the maximum instantaneous flow rate of the water outlet device is set to 65L / min-75L / min.

[0036] In some embodiments, the sewage discharge section is configured to have a flow cross section with a near-circular shape. The upper half of the flow cross section is approximately circular, and the lower half is a rectangle with a width approximately equal to the diameter of the upper half and a height approximately equal to the radius of the upper half. The two bottom corners of the rectangle are provided with chamfers with a radius of curvature greater than that of the upper half. The overall width of the flow cross section is 54mm-58mm, and the height is 57mm-61mm.

[0037] Through the above technical solution, compared with the unmodified toilet, the toilet provided by the present invention can discharge more flushing waste faster, improve the flushing ability of the toilet, and the increased pipe diameter is less prone to clogging.

[0038] When not flushing, the rising section is full of water, with the water level reaching the bottom of the pipe at its highest point. According to the principle of communicating vessels, the water level inside the bowl is at the same height as the water level in the rising section, thus maximizing the water level and flushing volume. During flushing, the nozzle directly opposite the pipe opening sprays water into the pipe. The high-velocity water flow quickly enters the rising section and flows into the falling section, creating a siphon effect. This rapidly empties the water from the bowl, flushing away waste and rinsing the bowl. The flushing water and waste then pass through the drain section and are discharged from the drain outlet. Once the water previously remaining in the bowl has been drawn out of the pipe and discharged, until the amount of water remaining in the bowl and rising section is small enough that adding water would not overflow the highest point of the rising section, water begins to flow from the outlet and is added until the water level reaches the highest point of the rising section, preparing for the next flush. In the siphon toilet's flushing process, the speed of the water flow when it overflows the highest point of the rising section determines the speed of the water flow drawn away by the siphon effect, thus determining the flushing force of the toilet.

[0039] This toilet features a tapered riser and descender section. This tapered structure in the riser reduces the surface area through which water can pass, resulting in a higher water velocity than a pipe with a constant cross-sectional area, even with the same water volume. Therefore, the water velocity is greater as it flows over the highest point of the riser and into the descender, and it accelerates further upon entering the descender, thus generating greater suction. This increased suction also means that more water can pass through in a shorter time, allowing for a larger flush volume without insufficient suction and preventing wastewater mixed with sewage from entering the bowl during a large flush.

[0040] For typical toilet pipes, if the pipe is too narrow, it increases water flow resistance and hinders waste removal. Conversely, if the pipe is too wide, the siphon effect weakens, resulting in insufficient suction and also hindering waste removal. Therefore, to achieve strong suction and high water volume while ensuring waste flows smoothly through the pipe, the pipe dimensions need to be designed and evaluated to obtain the most suitable size. Through the rational design of this toilet, even with a minimum pipe diameter of only 51-53mm, the pipe remains unblocked and allows for smooth drainage. The ratio of the pipe opening's cross-sectional area to the area of ​​the first cross-section is 1:0.52-1:0.72, and the ratio of the pipe opening's cross-sectional area to the area of ​​the second cross-section is 1:0.53-1:0.63. This pipe diameter design and ratio strike a balance between generating stronger siphon suction to move waste and ensuring smoother flow due to the larger pipe diameter, resulting in better flushing performance. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 is a front cross-sectional structural diagram of an embodiment of this application;

[0043] Figure 2 is a top view of an embodiment of this application;

[0044] Figure 3 is a partially enlarged structural schematic diagram of an embodiment of this application;

[0045] Figure 4 is a cross-sectional structural diagram of the pit opening section in one embodiment of this application;

[0046] Figure 5 is a schematic cross-sectional view of the pipe opening perpendicular to the flow direction in one embodiment of this application;

[0047] Figure 6 is a schematic cross-sectional view of the descending section perpendicular to the flow direction in one embodiment of this application;

[0048] Figure 7 is a schematic cross-sectional view of the sewage discharge section perpendicular to the flow direction in one embodiment of this application;

[0049] Figure 8 is a schematic diagram of the overall structure of an embodiment of the intelligent toilet flushing system of the present invention.

[0050] Figure 9 is a three-dimensional structural schematic diagram of an embodiment of the intelligent toilet of the present invention;

[0051] Figure 10 is a cross-sectional structural diagram of an embodiment of the intelligent toilet of the present invention;

[0052] Figure 11 is a schematic diagram of the flow passage section AA of the sewage discharge section in Figure 10.

[0053] Explanation of reference numerals in the attached diagram: 1. Tank body; 11. Tank inlet; 12. Sewage outlet; 13. Boss; 14. Pit opening section; 141. Pit opening section sidewall; 15. Spray nozzle; 16. Water cover; 2. Pipe; 21. Pipe opening; 22. Rising section; 221. First section; 23. Falling section; 231. Second section; 24. Sewage discharge section; 25. Sewage outlet; 3. Water tank; 31. Inlet valve; 4. Water pump; 5. Divider valve; 6. Upper spray nozzle; 7. Lower spray nozzle. Detailed Implementation

[0054] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0055] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0056] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] Furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible range of error. "Parallel" is not strictly parallel, but within the permissible range of error. Terms such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0058] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0059] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0060] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0061] To solve the above-mentioned technical problems, the present invention provides a toilet, as shown in FIG1, which includes a bucket body 1 and a pipe 2 connected to the bucket body 1.

[0062] The tank body 1 includes a tank body 1 inlet located at the top and a corresponding wastewater outlet 12 located at the bottom. A water outlet is located below the tank body 1 inlet, and a spray nozzle 15 is located below the wastewater outlet 12.

[0063] Pipeline 2 includes a pipe opening 21 and, sequentially, an ascending section 22, a descending section 23, and a sewage discharge section 24. The connection point between the ascending section 22 and the descending section 23 is their highest point. The jet nozzle 15 sprays water directly into the pipe opening 21 to flush away debris falling into the pipe from the sewage discharge outlet 12. The diameters of the ascending section 22 and the descending section 23 decrease along the water flow direction. The ratio of the cross-sectional area of ​​the pipe opening 21 to the area of ​​the first cross-section 221 between the ascending and descending sections is 1:0.52–1:0.72, and the ratio of the cross-sectional area of ​​the pipe opening 21 to the area of ​​the second cross-section 231 between the descending section 23 and the sewage discharge section 24 is 1:0.53–1:0.63. In some preferred embodiments, the ratio of the cross-sectional area of ​​the pipe opening 21 to the area of ​​the first cross-section 221 is 1:0.62, and the ratio of the cross-sectional area of ​​the pipe opening 21 to the area of ​​the second cross-section 231 is 1:0.576.

[0064] The flushing pump, capable of spraying water through the nozzle 15, is installed after the nozzle 15, along with a water tank connected to the flushing pump. The flushing pump can be any pump capable of providing sufficient pressure to deliver a sufficient amount of water into the pipe 2 to create a siphon effect. This invention does not relate to the flushing pump itself; operators should be able to select a suitable pump based on the flushing effect produced by the toilet provided by this invention and the requirements for various indicators of the toilet, in order to achieve a better flushing effect.

[0065] When not flushing, the rising section 22 is filled with water, and the water level reaches the bottom of the pipe 2 at the highest point of the rising section 22. According to the principle of communicating vessels, the water level in the tank 1 is at the same height as the water level in the rising section 22, thus achieving the maximum water level 16 and flushing volume. During flushing, the spray nozzle 15 facing the pipe opening 21 sprays water into the pipe 2. The high-velocity water can quickly rush into the rising section 22 and flow into the falling section 23, thereby creating a siphon effect and quickly draining the water in the tank 1 to flush away the dirt in the tank 1 and rinse the tank 1. The flushing water and dirt then pass through the drain section 24 and are discharged from the drain outlet 25. After the water previously left in the tank 1 is sucked into the pipe 2 and discharged, until the amount of water left in the tank 1 and the rising section 22 is small enough that even if water is added, it will not overflow the highest point of the rising section 22, the outlet starts to discharge water and add water until the water level rises to the position of the highest point of the rising section 22, in preparation for the next flush. In the flushing process of a siphon toilet, the instantaneous water volume when the water flows over the highest point of the rising section 22 determines the speed of the water flow sucked away in the siphon effect and the strength of the suction force generated after the siphon effect is triggered, thus determining the flushing power of the toilet.

[0066] The rising section 22 and the falling section 23 of this toilet adopt a tapered structure. The cross-section at the connection between the rising section 22 and the falling section 23 is the first cross-section 221, and the cross-section between the falling section 23 and the sewage discharge section 24 is the second cross-section 231. By adopting a tapered structure in the rising section 22, the water flow velocity within the tapered section 22 and the falling section 23 is greater than that of the pipe 2 with a constant cross-sectional area, given the reduced water volume. Therefore, the water flow velocity is greater when it overflows the highest point of the rising section 22 and flows into the falling section 23, and it further accelerates after entering the falling section 23, thus obtaining greater suction power.

[0067] For pipe 2, if it is too narrow, the water flow resistance will increase, hindering the discharge of waste. If it is too wide, the siphon effect will weaken, resulting in insufficient suction, which also hinders waste discharge. Therefore, to achieve strong suction while ensuring smooth waste passage through pipe 2, the dimensions of pipe 2 need to be designed and evaluated to obtain the most suitable size. Through the reasonable design of this toilet, even the smallest diameter section of pipe 2 can reach 51-53mm. Increasing the pipe diameter reduces blockages and achieves a better siphon effect. In this toilet, the ratio of the cross-sectional area of ​​pipe opening 21 to the area of ​​the first cross-section 221 is 1:0.52-1:0.72, and the ratio of the cross-sectional area of ​​pipe opening 21 to the area of ​​the second cross-section 231 is 1:0.53-1:0.63. This pipe diameter design and ratio achieve a balance between generating higher siphon suction to push waste and ensuring smoother pipe flow due to the larger pipe diameter, resulting in better waste disposal.

[0068] Table 1:

[0069] MISO is a substance used to simulate human feces and is commonly used as a test medium to measure the flushing power and efficiency of toilets. MaP is a parameter published by the Toilet Association for testing the flushing efficiency and power of toilets.

[0070] As can be seen from Table 1, the flushing capacity of the toilet flushing structure provided by this invention is higher than the industry standards of various countries.

[0071] Table 2:

[0072] As shown in Table 2, compared to existing technologies, the toilet of the present invention has a stronger sewage discharge capacity and exhibits better flushing performance in multiple flushing-related tests. Therefore, the toilet of the present invention can provide a better flushing effect through high suction power.

[0073] To ensure that the water cover 16 inside the toilet bowl is sufficiently high and large, and to ensure that the water jet from the nozzle 15 can overflow the highest point of the riser section 22 to induce a siphon effect, in some embodiments, the centerline of the riser section 22 has an elevation angle of 33°-39° relative to the horizontal plane. The centerline of the riser section 22 is the line connecting the center of the cross-section at the starting point and the center of the cross-section at the ending point of the riser section 22. This design of the riser section 22 ensures that during flushing, the water jet from the nozzle 15 can overflow the highest point of the riser section 22 to create a siphon effect, while also ensuring that the highest point of the riser section 22 is positioned appropriately to obtain a water cover 16 of suitable height within the bowl 1.

[0074] To reduce noise generated during flushing, in some embodiments, the rising section 22 is provided with a first area abrupt change section, the cross-sectional area of ​​which varies by 35%-40% in the flow direction; the sewage discharge section 24 is provided with a second area abrupt change section, the cross-sectional area of ​​which varies by 10%-20% in the flow direction. In pipe 2, when water is injected through the nozzle 15, the water flow collides with the inner walls of each section of pipe 2, changing the direction of the water flow. This collision generates noise. According to the principle of expansion chamber silencing, when sound waves propagate in pipe 2, encountering areas where the cross-sectional area changes, especially areas where the cross-sectional area suddenly expands or shrinks, it causes a sharp change in acoustic impedance, i.e., the resistance to sound wave propagation. This is because the direction of sound wave propagation changes in areas with abrupt changes in cross-sectional area, and some sound wave energy is reflected or even canceled out. The result of this phenomenon is that the energy of the sound wave is dissipated and attenuated. The area abrupt change sections in the rising section 22 and the drain section 24 of this invention can reduce the noise generated by the siphon toilet during flushing based on the expansion chamber silencing principle, thereby reducing the noise level and achieving a quieter operation. The area variation range of the first and second area abrupt change sections is determined under the premise that the rising section 22 and the drain section 24 enhance the siphon suction by reducing their cross-sectional area without affecting drainage. This arrangement of the first and second area abrupt change sections achieves a balance between noise reduction and ensuring smooth water flow within the pipe 2, resulting in a better effect. According to experimental data, the pipe 2 with the first and second area abrupt change sections can reduce the flushing noise by 3-5 dB compared to existing technologies during the flushing process of this toilet.

[0075] To further reduce noise, in some embodiments, a third area abrupt change section can be provided in the descending section 23. The cross-sectional area of ​​this third area abrupt change section varies by 10%-20% in the flow direction. When flushing, the water flow, due to its high speed, mixes with the air already present in the descending section 23, resulting in air bubbles and noise. By providing a third area abrupt change section in the descending section 23, the noise generated in the descending section 23 can be reduced based on the expansion chamber silencing principle, thereby achieving drainage at a lower noise level. The area variation range of the aforementioned third area abrupt change section is determined under the premise of ensuring smooth water flow within the descending section 23 and the ability to form a siphon and provide suction, achieving a balance between noise reduction and smooth water flow.

[0076] In some practical experiments, it was found that the sewage discharge section 24, lacking both the jet nozzle 15 preceding the rising section 22 and the nearly perpendicular angle of the horizontal plane found in the descending section 23, lacks any additional assistance besides the suction force generated by the siphon effect during sewage discharge, making it more prone to blockage. Therefore, to ensure smooth sewage discharge from the sewage discharge section 24, in some embodiments, as shown in Figure 1, the transverse drainage section 24 has an inclination angle α of 1°-3° downward relative to the horizontal plane. With the downward inclination angle of the sewage discharge section 24, the water flowing into it from the descending section 23 can be discharged more quickly under the influence of gravity, preventing the sewage discharge section 24 from flowing too slowly and affecting other parts of the pipe 2, thus slowing down their flow rates. The angle of the sewage discharge section 24 affects the space occupied by the entire pipe 2; an excessively large angle can severely impact the design of other parts of the pipe 2 and the shape of the toilet. The sewage discharge section 24 in this invention has an inclination angle α of 1°-3° downward relative to the horizontal plane, which can ensure that it does not affect the rising section 22 and the falling section 23, occupy little space, and also ensure that it can accelerate the discharge of water in the sewage discharge section 24.

[0077] In some embodiments, as shown in Figures 1 and 2, the barrel 1 further includes a protrusion 13 located above the spray nozzle and adjacent to the drain outlet 12. The distance b between the protrusion 13 and the top edge of the barrel inlet 11 on the horizontal plane is 305mm-335mm. The protrusion 13 extends towards the pipe opening 21 to prevent waste that has already fallen into the drain outlet 12 from overflowing without affecting the flow of waste into the drain outlet 12. The distance b between the protrusion 13 and the top edge of the barrel inlet 11 on the horizontal plane is set to 305mm-335mm, which provides a larger barrel compared to the prior art. With the height of the protrusion 13 to the barrel inlet 11 remaining unchanged, by extending the distance between the barrel inlet 11 and the protrusion 13 on the horizontal plane, a longer and smoother inner wall of the barrel 1 is provided. Thus, when a large amount of waste enters the barrel 1, more waste can fall onto the inner wall of the barrel 1 and slowly slide down to the drain outlet 12 under the buoyancy of the water in the barrel 1. When a large amount of waste enters the tub 1, the entire space from the drain outlet 12 to the bottom of the tub 1 will be filled. If all the waste falls above the drain outlet 12, it will cause the drain outlet 12 to become blocked, resulting in the failure of the flushing function of this toilet. The protrusion 13 provided above extends the inner wall of the tub 1, allowing the inner wall of the tub 1 to support some of the waste when a large amount of waste falls into the tub 1, thereby reducing the degree of blockage of the drain outlet 12 and preventing excessive waste from clogging the jet nozzle 15, which would make it difficult for the jet water to flush away the waste and cause blockage.

[0078] To make the toilet of this application applicable to various application scenarios, in some embodiments, as shown in Figure 2, the distance b between the top edge of the bucket protrusion 13 and the edge of the bucket inlet 11 on the horizontal plane is 255mm-285mm. In practical applications, since the space left for the toilet in the bathroom is usually small, the size of the bucket 1 has a great influence on the installation of the toilet, and thus a significant impact on the sales of the toilet. By setting the distance b between the top edge of the bucket protrusion 13 and the edge of the bucket inlet 11 on the horizontal plane to 255mm-285mm, and increasing the curvature of the lower part of the bucket 1, it is possible to ensure that there is sufficient water volume in the bucket 1 to induce siphoning and flushing, while maintaining the compact size and small footprint of the toilet, thereby giving it greater market competitiveness.

[0079] While improving the flushing power of the toilet to wash away more waste, the water cover 16, as an important means to prevent the evaporation of odors from the waste inside the toilet, has an area that directly affects whether the waste can be completely contained under the water cover 16. In some embodiments, as shown in Figure 3, the length c of the projection of the water cover 16 inside the bucket 1 onto the horizontal plane is 200mm-230mm, the width d is 165mm-185mm, and the area is 280cm². 2 -330cm 2 In some preferred embodiments, the projected length c of the water surface inside the tank 1 onto the horizontal plane is 217 mm, the width d is 177 mm, and the area is 310 cm². 2 The design of the bucket body 1 as described above ensures that the size of the water cover 16 falls within the aforementioned range, effectively submerging all waste that falls into the bucket body 1 beneath the water cover 16 to achieve a better odor-proof effect. Simultaneously, limiting the area of ​​the water cover 16 ensures that the water volume in the bucket body 1 is sufficient for flushing without becoming excessive, thus limiting the water consumption per flush to a reasonable range and saving water usage for this toilet.

[0080] According to the principle of communicating vessels, when the container 1 is filled with water without drainage, the depth of the water in the container 1 is determined by the height of the bottom of the pipe at the highest point of the rising section 22. Therefore, the highest water level in the rising section 22 determines the height of the water cover 16 relative to the bottom of the container 1. Since the container 1 has a horizontal cross-section with an area that gradually increases from bottom to top, the height of the water cover 16 relative to the bottom of the container 1 determines the area of ​​the water cover 16. Therefore, in order to obtain a larger water cover 16 to accommodate dirt and achieve a better odor prevention effect, it is necessary to increase the height of the highest water level in the rising section 22. In some embodiments, as shown in Figure 1, the height difference e between the highest water level in the rising section 22 and the bottom of the container 1 is set to 110mm-130mm, so that the depth of the water cover 16 in the container 1 is 110mm-130mm. The highest water level of the rising section 22, as described above, is higher than that of existing technologies. Given the fixed shape of the tank 1, this design allows for a larger water surface 16, resulting in a larger volume of water below the water surface 16. This allows for the containment of more waste below the water surface 16, leading to better odor control. Simultaneously, the larger volume of water within the tank 1 provides greater buoyancy to the waste. When a large amount of waste is discharged into the tank 1, the increased buoyancy reduces the density of the waste buildup, making it easier for the water jet from the spray nozzle 15 to clear it away and prevent blockages in the pipe 2.

[0081] When a large amount of dirt needs to be flushed from the spray nozzle 15, the dirt is usually piled up to a certain height below the drain outlet 12. Therefore, the area of ​​the drain outlet 12 determines the cross-sectional area of ​​the dirt that falls into the bottom of the tank 1 and accumulates, thus determining the amount of dirt that the water jet from the spray nozzle 15 needs to flush away per unit time. If the area of ​​the drain outlet 12 is too large, the water jet from the spray nozzle 15 will not be able to displace the dirt falling into the drain outlet 12, causing blockage. If the area of ​​the drain outlet 12 is too small, the dirt that can accumulate in the drain outlet 12 will accumulate too high. In a single flush, in order to save water, the spraying time of the spray nozzle 15 is short, making it difficult to completely flush away all the dirt. In some embodiments, as shown in Figure 3, the length f of the projection of the drain outlet 12 on the horizontal plane is 87mm-97mm, the width g is 73mm-83mm, and the area is 57cm². 2 -73cm 2 The dimensions of the drain outlet 12 provided by this invention are as follows: the drain outlet 12 is configured to have a length f of 87mm-97mm, a width g of 73mm-83mm, and an area of ​​57cm² in the horizontal plane. 2 -73cm 2 The projection ensures that all the dirt falling into the drain outlet 12 can be flushed away by the water flow provided by the spray nozzle 15, thus improving the flushing efficiency.

[0082] The cross-sectional area of ​​the pipe opening 21 directly determines the amount of contaminants that can enter the pipe 2 per unit time. In some embodiments, as shown in Figure 5, the pipe opening 21 has a roughly elliptical shape, but with more prominent upper left, lower left, upper right, and lower right sections. Specifically, it includes two arc segments symmetrically distributed at the left and right ends and two straight segments parallel to each other at the top and bottom ends. The ends of each arc segment smoothly transition to the ends of the straight segments. The radius of curvature of the arc segment is greater than half of the cross-sectional height. The distance between the straight segments is equal to the cross-sectional width, where the cross-sectional width h is 73mm-83mm, the cross-sectional height i is 55mm-65mm, and the area is 35cm². 2 -45cm 2 In some preferred embodiments, the cross-sectional width h is 77 mm, the cross-sectional height is 60 mm, and the area is 40 cm². 2 With the pipe opening 21 configured in this way, it can cooperate with the rising section 22, which has a gradually decreasing pipe diameter along the flow direction. At the pipe opening 21, more dirt and water can be accommodated, while the siphon effect generated by the rising section 22 with strong suction can flush away more dirt.

[0083] The rising section 22 can be configured to have the same shape and size as the pipe opening 21 along the flow direction to the first area abrupt change section, so as to accommodate more dirt in the rising section 22 while ensuring that there is a tapered design in the rising section 22 to provide sufficient suction to suck away the dirt in the rising section 22.

[0084] In some embodiments, as shown in Figures 1 and 4, the tank body 1 further includes a pit section 14 disposed below the drain outlet 12 and connected to the pipe outlet 21. A spray nozzle 15 is disposed on the side of the pit section 14 opposite to the pipe outlet 21. The pit section 14 includes two pit section sidewalls 141 perpendicular to the horizontal plane and parallel to each other. The pit section sidewalls 141 and the bottom of the tank body 1 form the pit section 14, thus defining the direction of the water flow sprayed by the spray nozzle 15 as directly facing the pipe outlet 21. The internal volume of the pit section 14 allows dirt to accumulate inside when it falls through the drain outlet 12, preventing blockage. When waste accumulates in the pit opening section 14, it piles up along its height, allowing it to be flushed away sequentially from bottom to top. Compared to directly placing the waste outlet 12 onto the pipe opening 21 and having it flushed by the spray nozzle 15 facing the pipe opening 21, the waste accumulated in the pit opening section 14 has a shorter length in the spray direction of the spray nozzle 15, making it easier to be flushed away by the water flow in the spray nozzle 15 and less prone to clogging. The force of the sprayed water flow reflects the magnitude of its kinetic energy. With a constant water volume, increasing the speed of the sprayed water flow increases its kinetic energy, thereby increasing its force. The shape of the sidewall 141 of the toilet bowl section determines the speed of the water jet from the nozzle 15 before it enters the pipe opening 21. Experiments have shown that by setting the sidewall 141 of the toilet bowl section perpendicular to the horizontal plane and with both sidewalls 141 parallel to each other, the water jet from the nozzle 15 to the pipe opening 21 can be maximized in speed and force, thus clearing blockages when they occur in the toilet bowl section 14. Simultaneously, because this shape of the sidewall 141 increases the speed of the jetting water, the volume and velocity of water flowing over the highest point of the rising section 22 and triggering a siphon effect also increase, thereby enhancing the suction force of the siphon effect and further improving the flushing effect of this toilet.

[0085] The dimensions of the pit section 14 determine the amount of waste that can accumulate in the pit section 14 when waste falls from the drain outlet 12 into it. In some embodiments, as shown in Figures 1 and 4, the length j of the cross-section of the pit section 14 perpendicular to the direction from the spray outlet 15 to the pipe outlet 21 is 73mm-83mm, the width k is 59mm-65mm, and the height l of the pit section sidewall 141 is 40mm-48mm. Since the waste accumulates vertically in the pit section 14, when it is washed away by the jet of water from the spray outlet 15, the waste below is washed away first, and the waste accumulated above it falls down and is then washed away. When the pit opening section 14 is too large, a large amount of sludge accumulates inside it, preventing the water jet from the nozzle 15 from flushing away the accumulated sludge. When the pit opening section 14 is too small, the sludge accumulated inside it will quickly pile up and overflow into the drain outlet 12, or even overflow above the water cover 16, causing the water cover 16 to lose its odor-proof effect. Furthermore, a single flush may not be able to completely remove the excessively high accumulation of sludge. Experimental verification shows that a pit opening section 14 with a length j of 73mm-83mm, a width k of 59mm-65mm, and a sidewall height l of 40mm-48mm is most suitable. This design maximizes the capacity of the pit opening section 14 while ensuring that the accumulated sludge can be flushed away by the water jet from the nozzle 15.

[0086] In some embodiments, as shown in FIG6, the flow passage cross-section of the descending section 23 is circular, or approximately circular due to actual manufacturing precision or design requirements. The flow passage cross-section of the descending section 23 has a diameter m, and the value of the diameter m is set to ensure that the ratio of the area of ​​the first cross-section 221 in the descending section 23 to the area of ​​the pipe opening 21 is between 1:0.52 and 1:0.72, and the ratio of the area of ​​the second cross-section 231 to the area of ​​the pipe opening 21 is between 1:0.53 and 1:0.63.

[0087] In some embodiments, as shown in FIG7, the flow cross-section of the sewage discharge section 24 has the following characteristics: the upper half of the flow cross-section is approximately circular, and the lower half is a rectangle with a width approximately equal to the diameter of the upper half and a height approximately equal to the radius of the upper half. The bottom two corners of this rectangle are provided with chamfers with a radius of curvature greater than that of the upper half. When the pipe 2 is in the flushing process, if the sewage discharge section becomes blocked, the entire flushing process will be obstructed. As shown in FIG1, compared to the rising section 22 near the jet nozzle 15 and the descending section 23 with an angle perpendicular to the horizontal plane, the sewage discharge section 24 has an angle almost parallel to the horizontal plane. The waste in this section does not experience water flow impact or the assistance of gravity during movement, making the sewage discharge section 24 more prone to blockage. By setting the sewage discharge section 24 to have the above-mentioned dimensions and shape, compared to the existing design, the flushing process can be ensured without affecting the overall design of the toilet, making the toilet suitable for flushing large amounts of waste. Specific data are shown in Table 3.

[0088] Table 3:

[0089] As shown in Table 3, compared with the toilet without the sewage section, the sewage section 24 with the above-mentioned size and shape was able to flush away more MISO in the MISO test and more ping-pong balls in the ping-pong ball test, indicating that adjusting the size and shape of the sewage section can achieve better flushing effect.

[0090] To further improve the flushing effect of this toilet, in some embodiments, the toilet also includes an intelligent toilet flushing system, which includes a water tank, a water pump, and a water distribution valve connected in sequence, and an upper spray nozzle and a lower spray nozzle respectively connected in sequence to the water distribution valve. The upper spray nozzle is located on the inner wall of the tank 1 at a position higher than the water surface 16, and the lower spray nozzle is located in the spray port 15, with its spray direction facing the pipe opening 21 to spray water into the pipe 2. The water tank is equipped with a water inlet valve for water intake, the water pump is a variable frequency water pump with adjustable speed to regulate the water flow rate through the pump within a certain period of time, and the water distribution valve is an electric water distribution valve to regulate the ratio of water sprayed from the upper spray nozzle and the lower spray nozzle. The water tank is also equipped with a water inlet valve, which is connected to an external water source to control the water entering the water tank. This intelligent toilet flushing system controls the inlet valve to allow external water to enter the water tank. During flushing, a water pump connected to the water tank draws water from the tank and distributes it to the upper and lower nozzles via a water distribution valve, allowing water to be sprayed out from the upper and lower nozzles in a set ratio.

[0091] In some embodiments, the water pump and the diversion valve are connected to a smart control center. The smart control center can be any controller capable of sending signals to the inlet valve, the water pump, and the diversion valve to adjust various parameters of the water pump and the diversion valve during the flushing process of this smart toilet flushing system. The smart control center is located inside the toilet in which the smart toilet flushing system is installed.

[0092] In some preferred embodiments, the inlet valve, water pump, and diversion valve are connected to an intelligent control center, which is also connected to sensors installed on the toilet. There can be one or more sensors, and the data they collect can be any data type required by the intelligent control center to optimize the flushing system of the intelligent toilet for better flushing performance, such as a liquid level sensor inside the toilet. By collecting data from the toilet and transmitting it to the intelligent control center, the center can adjust various adjustable parameters of the water pump and diversion valve, especially parameters during the flushing process. This allows the center to adjust the parameters of the water pump and diversion valve to target specific flushing needs and achieve better flushing results when blockages occur in the toilet.

[0093] The smart toilet flushing system performs the following flushing steps during the flushing process:

[0094] Upward flushing stage S1: The water pump is set to low speed, and the water distribution valve is opened so that the water flowing out of the upper nozzle is greater than the water flowing out of the lower nozzle, so as to raise the water level of the water cover 16.

[0095] Simultaneous flushing stage S2: The water pump is adjusted to a high speed setting, and the water distribution valve is adjusted so that the water volume sprayed from the lower nozzle is greater than the water volume sprayed from the upper nozzle, in order to push the dirt and trigger a siphon.

[0096] Water replenishment stage S3: The siphon effect ends, the water pump is adjusted to a low speed setting, and the water distribution valve is adjusted so that the water flowing out of the upper nozzle is greater than the water flowing out of the lower nozzle, so as to rinse the inner surface of the tank 1 again and restore the water cover height.

[0097] In the upward flushing stage S1, the upward flushing primarily involves water from the upper nozzles to raise the water surface 16 inside the toilet bowl, while simultaneously washing the inner surface of the tub 1. In the simultaneous flushing stage S2, the upper and lower nozzles flush at the same time in a certain ratio to avoid noise caused by the lower nozzle spraying water into the air when only the bottom nozzle is used. In the water replenishment stage S3, water is quickly replenished in the tub 1 by simultaneously spraying water from the upper and lower nozzles to form the water surface 16 for easy reuse.

[0098] The aforementioned intelligent toilet flushing system can adjust the water flow during flushing by regulating the speed of the variable frequency water pump, and adjust the ratio of water flowing from the upper and lower nozzles by using an electric water distribution valve. This allows for real-time adjustment of the water flow and the ratio of water from the upper and lower nozzles according to the needs of different flushing stages, achieving a better cleaning effect.

[0099] During flushing, the process begins with the upward flushing phase S1. The water pump is set to a low flow rate, and the diversion valve adjusts the flow so that most of the water flows slowly from the top nozzle. This allows the toilet bowl to hold more water without wasting it by flushing it past the highest point of the rising section 22, thus enhancing the siphon force and extending its duration. Simultaneously, the water flowing from the top nozzle washes the inner surface of the bowl 1, removing any dirt adhering to it. The upward flushing phase S1 ends when the water in the pipe 2 is about to overflow the highest point of the rising section 22.

[0100] At the start of the simultaneous flushing phase S2, the water pump is adjusted to a high flow rate, and the water distribution valve is adjusted so that most of the water is sprayed from the lower nozzle. This allows the water flow through the lower nozzle to flush away the dirt and fill the top of pipe 2, thus triggering a siphon effect. After the siphon effect ends, the simultaneous flushing phase S2 ends.

[0101] At the start of the water replenishment stage S3, the water pump is adjusted to a low flow rate, and the water distribution valve is adjusted so that most of the water flows out from the upper nozzle to re-rinse the inner surface of the tank 1. Simultaneously, while rapidly forming the water cover 16, water is rapidly replenished to the pipe opening 21 to prevent sewage backflow and odor caused by some sewage not being sucked in and discharged along the pipe 2 when the siphon effect ends. The water replenishment stage S3 ends when the water pump discharges the predetermined amount of water, forming the water cover 16 with sufficient area and depth. At this point, a complete flushing cycle is finished.

[0102] By using an adjustable water pump and a diverter valve, and setting these components according to the aforementioned flushing steps, water waste caused by overflowing the highest point of the rising section 22 during flushing can be avoided. Furthermore, the water flow and velocity at the lower nozzle can be increased to create a stronger siphon effect, thereby improving the flushing performance. Therefore, the intelligent toilet flushing system provided by this invention can produce a better flushing effect while saving water.

[0103] By combining the various settings in this toilet designed to improve flushing performance with the intelligent toilet flushing system, the flushing effect of this toilet can be further improved on the basis of the existing structure of the pipe 2, while maintaining water conservation. Specific experimental data are shown in Table 4.

[0104] Table 4:

[0105] As can be seen from the data in Table 4, the toilet provided by this invention outperforms existing technologies in all performance tests, and its water consumption also meets the water consumption standard for Class I water-saving toilets. Therefore, the toilet provided by this invention significantly improves flushing efficiency while ensuring water conservation, representing a significant advancement compared to existing technologies.

[0106] To further improve the flushing effect of this toilet, in some other embodiments, as shown in Figures 8 and 9, the toilet also includes a flushing system. The flushing system includes a water outlet device and an upper spray nozzle 6 and a lower spray nozzle 7 that are fluidly connected to the water outlet device. The upper spray nozzle 6 is located on the inner wall of the toilet bowl at a position higher than the water surface, and the lower spray nozzle 7 is located in the spray nozzle. The spray direction of the lower spray nozzle 7 is directly opposite the pipe opening so as to spray the water flow into the pipe. During the flushing process, the flushing system is configured to perform the following flushing steps: Upward flushing stage S1: The water outlet device is configured to deliver a low water volume, ensuring that the water volume flowing out of the upper nozzle 6 is greater than that flowing out of the lower nozzle 7, in order to raise the water level on the water surface and rinse the inner surface of the toilet bowl; Simultaneous flushing stage S2: The water outlet device is configured to deliver a high water volume, ensuring that the water volume sprayed out of the lower nozzle 7 is greater than that sprayed out of the upper nozzle 6, in order to push away waste and trigger a siphon; Replenishment stage S3: After the siphon effect ends, the water outlet device is configured to deliver a low water volume, ensuring that the water volume flowing out of the upper nozzle 6 is greater than that flowing out of the lower nozzle 7, in order to rinse the inner surface of the bowl again and restore the water level on the water surface.

[0107] The aforementioned water outlet device can be configured in any way and adjusted to execute the flushing process of the aforementioned flushing system, meeting the requirements for water output and distribution at each step of the flushing process. For example, the water outlet device can be a device with valves and a pump, wherein the pump can be adjusted to pump high or low water volume during the flushing process, and the valve can be adjusted during the flushing process to the ratio of water flowing from the upper nozzle 6 and the lower nozzle 7. The pump and valve work together to meet the requirements of the water outlet device during the flushing process. In the upward flushing stage S1, upward flushing refers to the upper nozzle 6 being the primary source of water flow, mainly using the water output from the upper nozzle 6 to raise the water surface inside the toilet bowl. In the simultaneous flushing stage S2, simultaneous flushing refers to the upper nozzle 6 and the lower nozzle 7 flushing simultaneously in a certain ratio to avoid noise caused by the lower nozzle 7 spraying water into the air when water is output from the bottom alone. In the water replenishment stage S3, water replenishment refers to the simultaneous output of water from the upper nozzle 6 and the lower nozzle 7 to quickly replenish the water in the toilet bowl to form a water surface for easy reuse.

[0108] The flushing system described above allows for adjustment of the water flow ratio from the upper nozzle 6 and the lower nozzle 7 by adjusting the settings of the water outlet device. This enables real-time adjustment of the water flow rate and the water flow ratio from the upper and lower nozzles according to the needs of different flushing stages, achieving a better cleaning effect.

[0109] During flushing, the process begins with the top flushing phase S1. The water flow is set to a low flow rate, and most of the water flows slowly from the top nozzle 6. This allows the toilet bowl to hold more water without wasting it by flushing it out of the drain pipe, thus enhancing the siphon force and extending its duration. Simultaneously, the water flowing from the top nozzle 6 washes the inner surface of the toilet bowl, removing any dirt adhering to it. The top flushing phase S1 ends when the water in the drain pipe is about to overflow its highest point.

[0110] At the start of the simultaneous flushing phase S2, the water outlet device is adjusted to a high flow rate, with most of the water sprayed from the lower nozzle 7. This allows the water flow through the lower nozzle 7 to flush away the debris and fill the top of the sewage pipe, thus triggering a siphon effect. After the siphon effect ends, the simultaneous flushing phase S2 concludes.

[0111] The water replenishment stage S3 begins by adjusting the water outlet device to a low flow rate, ensuring that most of the water flows out from the upper nozzle 6 to re-rinse the inner surface of the tank. Simultaneously, while rapidly forming a water cover, water is quickly replenished to the drain pipe to prevent backflow and odor caused by untreated wastewater failing to be drawn in and discharged through the drain pipe when the siphon effect ends. The water replenishment stage S3 ends when the water outlet device has discharged the predetermined amount of water, forming a water cover of sufficient area and depth. This completes one full flush.

[0112] By using an adjustable water outlet device and setting it according to the above-described flushing steps, waste caused by water overflowing the highest point of the drain pipe during flushing can be avoided. Furthermore, the water flow rate and velocity at the lower nozzle 7 can be increased to induce a stronger siphon effect, thereby improving the flushing effect. Therefore, the flushing system provided by this invention can produce a better flushing effect while saving water. In some embodiments, the water outlet device includes a water tank 3 and at least one water pump 4 fluidly connected to the water tank 3. The water pump 4 is fluidly connected to the upper nozzle 6 and the lower nozzle 7, wherein the water tank 3 is provided with an inlet valve 31 for water intake.

[0113] The water flow requirements in steps S1, S2, and S3 are achieved by setting up multiple water pumps 4 and controlling the opening and closing of some or all of them. Specifically, the multiple water pumps 4 can be set up in series so that a low flow rate can be achieved by turning off some of the water pumps 4 in steps S1 and S3, and a high flow rate can be achieved by turning on all of the multiple water pumps 4 in series in step S2.

[0114] In some embodiments, the water pump 4 is configured as a variable frequency water pump that can adjust the water flow rate through the water pump 4 within a certain time by adjusting the rotation speed, thereby meeting the water demand in steps S1, S2 and S3.

[0115] By setting up a variable frequency water pump 4, only one variable frequency water pump 4 is needed to achieve the low water output in steps S1 and S3, and the high water output in step S2, thereby saving the space required to set up the water pump 4, and thus saving the internal space of the smart toilet with this flushing system installed.

[0116] In some embodiments, the water outlet device includes at least one water distribution valve 5, which is fluidly connected to the upper nozzle 6 and / or the lower nozzle 7.

[0117] By setting multiple water distribution valves 5, the water distribution valves 5 can be configured to the states described in the flushing process during steps S1, S2, and S3. Specifically, pipes can be connected to the first and second water distribution valves respectively. The first and second water distribution valves are pressure-sensitive valves. The first water distribution valve is configured to open only under low water pressure, diverting most of the water to the upper nozzle 4. The second water distribution valve is configured to open only under high water pressure, diverting most of the water to the lower nozzle 5. Through the first and second water distribution valves, in steps S1 and S3, when the water outlet of the water device is discharging at a low flow rate, only the first water distribution valve is opened; in step S2, when the water outlet of the water device is discharging at a high flow rate, only the second water distribution valve is opened. This allows the water distribution valves 5 to perform each step of the flushing process described above.

[0118] In some embodiments, a timer switch can be set, and each water pump 4 and water distribution valve 5 can be connected to the timer switch. When the flushing process of this flushing system is triggered, the timer switch can trigger the opening and closing of multiple water pumps 4 and water distribution valves 5 in stages, so that the water pumps 4 and water distribution valves 5 can be set in steps S1, S2 and S3 respectively to meet the requirements of each step for the pumped water volume and the ratio between the upper nozzle 6 and the lower nozzle 7 during a complete flushing process.

[0119] In some embodiments, the water distribution valve 5 is configured as an electrically operated water distribution valve capable of adjusting the ratio of water sprayed from the upper nozzle 6 and the lower nozzle 7, thereby meeting the water distribution requirements in steps S1, S2, and S3. By setting an electrically operated water distribution valve, the water distribution between the upper nozzle 6 and the lower nozzle 7 in steps S1, S2, and S3 can be completed with only one electrically operated water distribution valve 5, thereby saving space for setting the water distribution valve 5 and the corresponding pipes, and thus saving internal space in the smart toilet with this flushing system installed.

[0120] In some embodiments, the water pump 4 and the diversion valve 5 are connected to an intelligent control center. The intelligent control center can be any controller capable of sending signals to the inlet valve 31, the water pump 4, and the diversion valve 5 to adjust various parameters of the water pump 4 and the diversion valve 5 during the flushing process. The intelligent control center is located inside the toilet in which the flushing system is installed.

[0121] In some preferred embodiments, the intelligent control center connected to the inlet valve 31, water pump 4, and diversion valve 5 is also connected to sensors installed on the toilet. There can be one or more sensors, and the data they collect can be any data type required by the intelligent control center to optimize the flushing system for better flushing performance, such as a toilet bowl liquid level sensor. These sensors collect data from the toilet and transmit it to the intelligent control center. Using this data, the intelligent control center can adjust various adjustable parameters of the water pump 4 and diversion valve 5, especially parameters during the flushing process. Therefore, when blockage occurs in the toilet, the parameters of the water pump 4 and diversion valve 5 can be adjusted for targeted flushing, resulting in a better flushing effect.

[0122] In some embodiments, during the flushing process, the flushing time of the top flushing phase S1 is set to 2.5s-4s, and the flushing time of the same flushing phase S2 is set to 2.5s-3.2s. In some preferred embodiments, the flushing time of the water replenishment phase S3 can also be set to 3s-7s.

[0123] To achieve the required flushing time in each step of the flushing process, the working time of the water pump 4 and the water distribution valve 5 can be adjusted. For example, the water pump 4 and the water distribution valve 5 can be connected to a timer switch that has been set according to the flushing time. When the flushing process is triggered, the timer switch is triggered and the water pump 4 and the water distribution valve 5 are triggered according to the flushing time.

[0124] If the flushing time of the upward flushing phase S1 is less than 2.5 seconds, the amount of water entering the toilet bowl will be too small, failing to adequately clean the inner surface of the bowl. If the flushing time of the upward flushing phase S1 is greater than 4 seconds, the continuous water supply from the water pump 4 will cause the amount of water contained in the toilet bowl to exceed its capacity, resulting in water overflowing the top of the drain pipe and wasting water.

[0125] If the flushing time of the same flushing stage S2 is less than 2.5s, the lower nozzle 7 will not be able to spray out enough water, and the duration of the siphon effect will be shortened, resulting in some dirt flowing back. If the flushing time of the same flushing stage S2 is longer than 3.2s, the dirt will continue to generate a siphon effect and be cleaned after being flushed, wasting water resources.

[0126] By setting the flushing time as described above, a better flushing effect can be achieved under the same conditions, flushing away heavier waste while maintaining water consumption in accordance with the standard for Class 1 water-saving toilets. Specific experimental data are shown in Table 5 (the artificial specimen (MISO) is a standardized object used to simulate feces in toilet testing. The MISO in the remaining tables below is the same as described above).

[0127] Table 5:

[0128] As shown in Table 5, compared with the prior art, the flushing system provided by this invention can flush away 900g of MISO, and the water volume is only increased by 0.4L, which still meets the water consumption standard of the first-class water-saving toilet.

[0129] In some embodiments, during the flushing process, the total water output in the top flushing stage S1 is set to 0.4L-0.6L, and the total water output in the same flushing stage S2 is set to 2.5-2.9L. In some preferred embodiments, the total water output in the replenishment stage S3 is set to 1.3L-1.9L.

[0130] During the flushing phase S1, when the total water output is set to 0.4L-0.6L, it ensures that there is enough water in the toilet to trigger a stronger siphon, while preventing water from overflowing the top of the drain pipe and causing waste.

[0131] In the flushing stage S2, when the total water output is set to 2.5-2.9L, it can ensure that there is enough water in the lower nozzle 7 to flush away the accumulated dirt, push the dirt into the sewage pipe and trigger a siphon, thereby flushing the water, and also ensure that there is enough water in the upper nozzle 6.

[0132] By setting the total water output for each stage as described above, a better flushing effect can be achieved under the same conditions, flushing away heavier waste while maintaining water consumption in accordance with the standard for a Class 1 water-saving toilet. Specific experimental data are shown in Table 6.

[0133] Table 6:

[0134] As shown in Table 6, compared with the prior art, the flushing system provided by this invention can flush away 1000g of MISO without increasing the water volume, which meets the water consumption standard of the first-class water-saving toilet.

[0135] In some embodiments, during the flushing process, the average water flow rate of the water outlet device is set to 25L / min-35L / min in the top flushing phase S1, and to 50L / min-70L / min in the simultaneous flushing phase S2. With the above-set average water flow rate, the water surface can be quickly raised to the top of the drain pipe in the top flushing phase S1, allowing the toilet to hold its maximum capacity of water, thereby providing the maximum suction power that the toilet can provide when the siphon effect occurs. Simultaneously, in the simultaneous flushing phase S2, the above-mentioned water volume allows sufficient water to be ejected from the lower nozzle 7, so that while flushing away accumulated waste, as much water as possible is flushed into the drain pipe in the simultaneous flushing phase S2, thereby triggering a stronger siphon effect. Furthermore, during the flushing phase S2, the water flowing from the upper nozzle 6 can quickly flow to the bottom of the toilet bowl after the siphon effect occurs. This allows the water in the toilet bowl to be quickly filled after being drawn away from the bottom by the siphon effect, preventing the lower nozzle 7 from directly spraying a large volume of water at high speed into the air instead of the water body, thus avoiding noise. Therefore, the average water flow rate set above improves the flushing capacity of this flushing system and reduces noise generated during use.

[0136] In some embodiments, during the flushing process, the maximum instantaneous flow rate of the water outlet device in the top flushing stage S1 is set to 25L / min-35L / min, and the maximum instantaneous flow rate of the water outlet device in the same flushing stage S2 is set to 65L / min-75L / min.

[0137] When the maximum instantaneous water flow rate of the water outlet device in the flushing stage S1 is between 25L / min and 35L / min, it can allow the toilet bowl to hold as much water as possible before a siphon is generated, thereby saving water while increasing the suction power of the siphon effect.

[0138] When the maximum instantaneous water output of the water outlet device in the simultaneous flushing stage S2 is between 65L / min and 7L / min, it can drive enough water and generate enough thrust to flush away the accumulated dirt and trigger a siphon effect to discharge the dirt, without causing excessive waste of water resources.

[0139] The water pump 4 can be configured as any variable frequency water pump capable of changing its rotational speed to meet the requirements of the flushing steps in this flushing system. In some embodiments, during the flushing process, the rotational speed of the water pump 4 is set to 2800 r / min-3200 r / min in the initial flushing phase S1, 5500 r / min-6200 r / min in the peak instantaneous flow rate range of the rotational speed in the simultaneous flushing phase S2, and 2000 r / min-3200 r / min in the replenishment phase S3. The water pump 4 configured in this way can spray the aforementioned total water flow during the duration of each of the above phases, thereby ensuring that the flushing steps used in this flushing system can be performed.

[0140] In some embodiments, during the flushing process, the ratio of water output from the upper nozzle 6 to the total water output in the upward flushing phase S1 is 60%-80%, and the ratio in the same flushing phase S2 is 0%-30%. In some preferred embodiments, the ratio of water output from the upper nozzle 6 to the total water output in the water replenishment phase S3 is 70%-90%. The water output from the lower nozzle 7 is obtained by subtracting the proportion of water output from the upper nozzle 6 from the total water volume. By setting the water volume ratio between the upper nozzle 6 and the lower nozzle 7 in this way, the flushing effect can be ensured while saving water in each phase.

[0141] During the flushing phase S1, most of the water flows out of the upper nozzle 6 to replenish the water in the toilet bowl, while the water sprayed out of the lower nozzle 7 accounts for a smaller proportion. This prevents the water in the flushing phase S1 from overflowing from the top of the drain pipe and flowing away through it. At the same time, it also allows the flushing phase S1 to raise the water surface, so that more water can participate in the formation of the siphon effect when it occurs later, thereby obtaining greater suction and a better flushing effect.

[0142] During the flushing phase S2, the upper nozzle 6 sprays less water, but the high pressure from the water pump 4 during this phase still flushes the inner wall of the toilet and quickly reaches the bottom of the toilet to prevent the lower nozzle 7 from spraying into the air. At the same time, the lower nozzle 7 sprays a large amount of water with great force, which can make more water pass over the highest point of the sewage pipe when a siphon is generated, thereby obtaining greater suction and producing a better flushing effect.

[0143] During the water replenishment stage S3, most of the water flows out from the upper nozzle 6, thus preventing water from flowing out of the drain pipe and causing siphoning again during water replenishment, and quickly restoring the water surface to a suitable height to facilitate subsequent use of the toilet after flushing.

[0144] In some embodiments, the ratio of the water flowing out of the upper nozzle 6 to the total water volume in each of the above-mentioned stages can be set to vary within a range defined by each stage. That is, the water distribution valve 5 not only adjusts the ratio of the water volume distributed to the upper nozzle 6 and the lower nozzle 7 between the upward flushing stage S1, the simultaneous flushing stage S2, and the water replenishment stage S3, but also adjusts the water volume distributed to the upper nozzle 6 and the lower nozzle 7 within each of the upward flushing stage S1, the simultaneous flushing stage S2, and the water replenishment stage S3, thereby meeting the needs of each stage in different stages. For example, in the simultaneous flushing stage S2, when the lower nozzle 7 just begins to spray water, the water distribution valve 5 can be set to a ratio within the above-mentioned range where the flow rate of the upper nozzle 6 is the minimum and the flow rate of the lower nozzle 7 is the maximum, so that the lower nozzle 7 can flush away the accumulated dirt with the maximum water flow, thereby improving the flushing effect in the simultaneous flushing stage S2. At the end of the flushing phase S2, the water distribution valve 5 can be set to a larger proportion of the flow rate of the nozzle 6 within the above range, so that the water sprayed from the upper nozzle 6 is sufficient to fill the space in front of the lower nozzle 7 in the toilet bowl, ensuring that the lower nozzle 7 does not spray into the air.

[0145] The water distribution valve 5 can be configured to quickly switch the ratio of the water volume delivered to the upper nozzle 6 and the lower nozzle 7 under the above water flow rate, and switch the ratio to any type of valve, such as an electric water distribution valve and a pneumatic water distribution valve.

[0146] Compared to existing technologies, the aforementioned smart toilet improves flushing efficiency while maintaining water consumption within a reasonable range, representing a significant advancement. Specific data is shown in Table 7.

[0147] Table 7:

[0148] As can be seen from Table 7, using this flushing system and the above-described flushing method increases the MISO throughput from 800g to 1000g for toilets, while maintaining the flushing water volume at the standard of a Class 1 water-saving toilet.

[0149] In some embodiments, as shown in Figures 10 and 11, the waste discharge section has a flow section AA with the shape shown in Figure 11. The upper half of the flow section AA is approximately circular, and the lower half is a rectangle with a width approximately equal to the diameter of the upper half and a height approximately equal to the radius of the upper half. The two bottom corners of the rectangle have chamfers with a radius of curvature greater than that of the upper half. The width n of the flow section AA is 54mm-58mm, and the height o is 57mm-61mm. In a preferred embodiment, the width n is set to 56mm, and the height o is set to 59mm. The waste discharge section refers to the section located at the bottom of the smart toilet, at the end of the pipe 2. When the pipe 2 is flushing, if the waste discharge section becomes blocked, it will cause the entire flushing process to be obstructed. As shown in Figure 10, compared to the rising section near the lower nozzle 7 and the descending section with an angle perpendicular to the horizontal plane, the waste discharge section has an angle almost parallel to the horizontal plane. The waste in this section does not experience water flow impact or the assistance of gravity during movement, making the waste discharge section more prone to blockage. By setting the sewage discharge section to the aforementioned dimensions and shape, compared to the sewage discharge section design in existing technologies, the flushing process can be ensured without affecting the overall design of the toilet. The effect is more pronounced when flushing a large amount of simulated feces. Specific data are shown in Table 8.

[0150] Table 8:

[0151] As shown in Table 8, compared with toilets without this type of flushing section, toilets with the above-mentioned size and shape of flushing section were able to flush away more soft MISO in the soft MISO test and more ping-pong balls in the ping-pong ball test, indicating that adjusting the size and shape of the flushing section can achieve better flushing results.

[0152] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0153] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A toilet seat, characterized in that, include: The barrel (1) includes a barrel inlet (11) at the top and a corresponding sewage outlet (12) at the bottom. A water outlet is provided below the barrel inlet (11), and a spray nozzle (15) is provided below the sewage outlet (12). A pipe (2) is connected to the barrel (1) through the drain outlet (12). The pipe (2) includes a pipe opening (21) and, in sequence, an ascending section (22), a descending section (23), a drain section (24), and a drain outlet (25). The connection point between the ascending section (22) and the descending section (23) is the highest point of the ascending section (22) and the descending section (23). The spray direction of the spray nozzle (15) is directly facing the pipe opening (21) to deliver water into the pipe (2) and flush it. The dirt falling from the drain outlet (12) is brushed off. Along the water flow direction, the diameters of the rising section (22) and the falling section (23) decrease respectively. The ratio of the cross-sectional area of ​​the pipe opening (21) to the area of ​​the first cross-section (221) between the rising section (22) and the falling section (23) is 1:0.52-1:0.72, and the ratio of the cross-sectional area of ​​the pipe opening (21) to the area of ​​the second cross-section (231) between the falling section (23) and the drain section (24) is 1:0.53-1:0.

63.

2. A toilet according to claim 1, characterized in that, The rising segment (22) is provided with a first area abrupt change segment, and the falling segment (23) is provided with a second area abrupt change segment.

3. A toilet according to claim 2, characterized in that, The cross-sectional area of ​​the first abrupt area change segment varies by 35%-40% before and after, and the cross-sectional area of ​​the second abrupt area change segment varies by 10%-20% before and after.

4. A toilet according to claim 1, characterized in that, The sewage discharge section (24) has an inclination angle (a) of 1°-3° downward relative to the horizontal plane.

5. A toilet according to claim 1, characterized in that, The barrel (1) also includes a boss (13) located above the spray port (15) and adjacent to the sewage outlet (12), the distance (b) between the boss (13) and the top edge of the barrel inlet (11) on the horizontal plane is 305mm-335mm.

6. A toilet according to claim 1, characterized in that, The barrel (1) also includes a boss (13) located above the spray port (15) and adjacent to the sewage outlet (12), the distance (b) between the boss (13) and the top edge of the barrel inlet (11) on the horizontal plane is 255mm-285mm.

7. A toilet according to claim 1, characterized in that, The water cover (16) inside the barrel (1) has a projection length (c) of 200mm-230mm on the horizontal plane, a width (d) of 165mm-185mm, and an area of ​​280cm². 2 -330cm 2 .

8. A toilet according to claim 1, characterized in that, The height difference (e) between the highest water level in the rising section (22) and the bottom of the barrel (1) is set to 110mm-130mm, so that the height difference between the water cover (16) inside the barrel (1) and the bottom of the barrel (1) is 110mm-130mm.

9. A toilet according to claim 1, characterized in that, The length (f) of the projection of the drain outlet (12) on the horizontal plane is 87mm-97mm, the width (g) is 73mm-83mm, and the area is 57mm². 2 -73mm 2 .

10. A toilet according to claim 1, characterized in that, The pipe opening (21) is approximately elliptical, but with more prominent upper left, lower left, upper right, and lower right sections. Specifically, it comprises two symmetrically distributed arc segments at the left and right ends and two parallel straight segments at the upper and lower ends. Each arc segment's ends smoothly connect to the ends of the straight segments. The radius of curvature of the arc segments is greater than half the cross-sectional height. The distance between the straight segments is equal to the cross-sectional width, where the cross-sectional width (h) is 73mm-83mm, the cross-sectional height (i) is 55mm-65mm, and the area is 35cm². 2 -45cm 2 .

11. A toilet according to claim 1, characterized in that, The barrel (1) also includes a pit section (14) located below the sewage outlet (12) and connected to the pipe outlet (21). The spray nozzle (15) is located on the side of the pit section (14) opposite to the pipe outlet (21). The pit section (14) includes two pit section sidewalls (141) that are perpendicular to the horizontal plane and parallel to each other. The pit section sidewalls (141) and the bottom of the barrel (1) form the pit section (14) to limit the direction of water flow sprayed by the spray nozzle (15) to be directly opposite the pipe outlet (21).

12. A toilet according to claim 11, characterized in that, The length (j) of the horizontal cross section of the pit opening section (14) is 73mm-83mm, the width (k) is 59mm-65mm, and the height (l) of the side wall (141) of the pit opening section is 40mm-48mm.

13. A toilet according to claim 11, characterized in that, The toilet also includes a flushing system, which includes a water outlet device and an upper spray nozzle (6) and a lower spray nozzle (7) fluidly connected to the water outlet device. The upper spray nozzle (6) is located on the inner wall of the tub (1) at a position higher than the water surface (16). The lower spray nozzle (7) is located in the spray port (15). The spray direction of the lower spray nozzle (7) is directly opposite the pipe opening (21) so as to spray the water flow into the pipe (2). During the flushing process, the flushing system is configured to perform the following flushing steps: Upward flushing stage S1: The water outlet device is set to deliver a low water volume, and the water volume flowing out of the upper nozzle (6) is greater than the water volume flowing out of the lower nozzle (7) in order to raise the water level of the water surface and rinse the inner surface of the toilet bowl. Simultaneous flushing stage S2: The water outlet device is configured to deliver a high volume of water, and the volume of water sprayed from the lower nozzle (7) is greater than the volume of water sprayed from the upper nozzle (6) to push the dirt and trigger a siphon. Water replenishment stage S3: The siphon effect ends, the water outlet device is set to deliver a low water volume, and the water volume flowing out of the upper nozzle (6) is greater than the water volume flowing out of the lower nozzle (7) to rinse the inner surface of the barrel again and restore the water cover height.

14. A toilet according to claim 13, characterized in that, The water outlet device includes a water tank (3) and at least one water pump (4) fluidly connected to the water tank (3), the water pump (4) being fluidly connected to the upper nozzle (6) and the lower nozzle (7), wherein the water tank (3) is provided with an inlet valve (31) for water intake.

15. A toilet according to claim 14, characterized in that, The water pump (4) is configured as a variable frequency water pump that can adjust the water flow rate through the water pump (4) within a certain time by adjusting the rotation speed.

16. A toilet according to claim 13, characterized in that, The water outlet device includes at least one water distribution valve (5), which is fluidly connected to the upper nozzle (6) and / or the lower nozzle (7).

17. A toilet according to claim 16, characterized in that, The water distribution valves (5) and (3) are configured as electric water distribution valves capable of adjusting the ratio of water sprayed from the upper nozzle (6) and the lower nozzle (7).

18. A toilet according to claim 13, characterized in that, During the flushing process, the flushing time of the upward flushing stage S1 is set to 2.5s-4s, and the flushing time of the same flushing stage S2 is set to 2.5s-3.2s.

19. A toilet according to claim 13, characterized in that, During the flushing process, the total water output in the initial flushing stage S1 is set to 0.4L-0.6L, the total water output in the simultaneous flushing stage S2 is set to 2.5-2.9L, and the total water output in the replenishment stage S3 is set to 1.3L-1.9L.

20. A toilet according to claim 13, characterized in that, In the upward flushing stage S1, the ratio of the water output from the upper nozzle (6) to the total water output of the stage is 60%-80%; in the simultaneous flushing stage S2, the ratio of the water output from the upper nozzle (6) to the total water output of the stage is 0%-30%.

21. A toilet according to claim 13, characterized in that, In the upward flushing stage S1, the average water flow rate of the water outlet device is set to 6L / min-14L / min; in the simultaneous flushing stage S2, the average water flow rate of the water outlet device is set to 50L / min-70L / min.

22. A toilet according to claim 13, characterized in that, In the upward flushing stage S1, the maximum instantaneous flow rate of the water outlet device is set to 25L / min-35L / min; in the simultaneous flushing stage S2, the maximum instantaneous flow rate of the water outlet device is set to 65L / min-75L / min.

23. A toilet according to claim 13, characterized in that, The sewage discharge section is configured with a flow passage section (AA) that is nearly circular in shape. The upper half of the flow passage section (AA) is approximately circular, and the lower half is a rectangle with a width approximately equal to the diameter of the upper half and a height approximately equal to the radius of the upper half. The two bottom corners of the rectangle are provided with chamfers with a radius of curvature greater than that of the upper half. The overall width (n) of the flow passage section (AA) is 54mm-58mm, and the height (o) is 57mm-61mm.

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