A siphon plumbing arrangement and toilet

Abstract

A siphonic pipe device and toilet include a pipe body; the pipe body has a waste inlet section and a siphonic section connected in sequence; one end of the waste inlet section has a waste inlet, and the other end is connected to the siphonic section; a contraction section is provided at the end where the waste inlet section and the siphonic section are connected, the cross-sectional area of ​​the contraction section gradually decreases along the fluid flow direction of the pipe body, and the cross-sectional area of ​​the waste inlet is larger than the cross-sectional area of ​​the initial end of the contraction section; the siphonic section is connected to the smallest cross-sectional end of the contraction section; the cross-sectional area of ​​the siphon section is larger than the smallest cross-sectional area of ​​the contraction section. This invention can reduce waste residue and lower noise.

Description

Technical Field

[0001] This invention relates to the field of sanitary ware, and in particular to a siphon pipe device and a toilet. Background Technology

[0002] Currently, toilets mainly use two sewage discharge methods: jet siphon and flush.

[0003] See Figure 9 Jet siphon toilets have bottom jet holes at the drain pipe inlet. During flushing, some water flows directly into the pipe through these jet holes, helping to move waste and creating a siphon effect. This structure generates a strong siphon force, resulting in good waste removal. However, because some water is allocated to the jet holes, the water flow from the brush ring holes (washing holes) is correspondingly reduced, leading to insufficient flushing of the liner (bowl surface). Sticky waste (such as feces, paper scraps, etc.) is more likely to remain, affecting the cleaning experience. Furthermore, to maintain the siphon effect, the pipes are usually designed to be long and narrow, increasing the risk of clogging; simultaneously, the high water velocity and pressure from the jet holes can easily generate noticeable vibration noise.

[0004] See Figure 10 Washdown toilets do not have jet nozzles; all flushing water flows through the brush ring holes to the toilet bowl, resulting in strong flushing power and effective removal of adhesive dirt. However, their short, straight pipes with a large cross-section make it difficult to form a siphon, relying mainly on the gravitational potential energy and flow pressure of the water for waste removal. Due to the chaotic water flow at the inlet, lightweight floating objects (such as cigarette butts and lint) tend to slosh around repeatedly at the pipe inlet, failing to be flushed out in one go and often remaining on the inner wall of the liner. Simultaneously, the disorderly impact of the water flow against the pipe walls also generates significant flushing noise. Summary of the Invention

[0005] The main objective of this invention is to overcome the shortcomings of existing toilets, such as loud flushing noise from the sewage pipes, easy residue buildup, and insufficient flushing due to water flow distribution in some structures. This invention proposes a siphon pipe device and toilet that, by optimizing the flow channel shape, reduces residue buildup and lowers operating noise while ensuring sewage discharge capacity.

[0006] The present invention adopts the following technical solution:

[0007] A siphon pipe device includes a pipe body; the pipe body has a sewage inlet section and a siphon section connected in sequence; one end of the sewage inlet section has a sewage inlet, and the other end is connected to the siphon section; a contraction section is provided at the end where the sewage inlet section and the siphon section are connected, the cross-sectional area of ​​the contraction section gradually decreases along the fluid flow direction of the pipe body, and the cross-sectional area of ​​the sewage inlet is larger than the cross-sectional area of ​​the starting end of the contraction section; the siphon section is connected to the smallest cross-sectional end of the contraction section; the cross-sectional area of ​​the siphon section is larger than the smallest cross-sectional area of ​​the contraction section.

[0008] Furthermore, the siphon section includes a buffer section and a turning section. One end of the buffer section is connected to the smallest cross-sectional end of the contraction section, and the other end of the buffer section is connected to the turning section. The horizontal plane at the lowest point of the inner wall of the connection between the buffer section and the turning section constitutes the water cover of the siphon section.

[0009] Furthermore, the region where the lowest point of the inner wall where the buffer section and the contraction section meet forms a first curved segment extending along the fluid flow direction of the pipe body; the region where the lowest point of the inner wall where the buffer section and the turning section meet forms a second curved segment extending along the fluid flow direction of the pipe body, the radius of curvature of the second curved segment being smaller than the radius of curvature of the first curved segment; the first curved segment and the second curved segment are connected by a straight segment, and the two ends of the straight segment are connected to and tangent to the first curved segment and the second curved segment, respectively.

[0010] Furthermore, the radius of curvature of the lowest point of the first curve segment is 95.5-98 mm, and the radius of curvature of the lowest point of the second curve segment is 20-22.5 mm.

[0011] Furthermore, along the fluid flow direction of the pipe body, the angle between the tangent at the starting point of the first curve segment and the tangent at the ending point of the first curve segment is 92-108°.

[0012] Furthermore, the cross-section of the siphon section is elliptical, with a major axis and a minor axis; and along the fluid flow direction of the pipe body, the difference in length between the major axis and the minor axis of the siphon section cross-section gradually decreases.

[0013] Furthermore, the cross-section of the siphon section is elliptical, with a major axis and a minor axis; and along the fluid flow direction of the pipe body, the length of the major axis of the siphon section gradually decreases, while the length of the minor axis of the siphon section gradually increases.

[0014] Furthermore, the cross-section of the sewage inlet section is elliptical, with a major axis and a minor axis; along the fluid flow direction of the pipe body, the minor axis of the contraction section gradually decreases, and the major axis of the contraction section gradually decreases.

[0015] Furthermore, the minor axis length of the cross-section of the contraction section ranges from 46 to 50 mm; the major axis length of the cross-section of the contraction section ranges from 82 to 84 mm.

[0016] A toilet includes a bucket body with a toilet bowl, and also includes the aforementioned siphon pipe device, with the bottom of the toilet bowl connected to a sewage inlet.

[0017] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In this invention, the inlet, constriction section, and siphon section are connected sequentially, forming a flow channel that is wide at first, then narrow, and then widens again. When water flows through the constriction section, the flow accelerates due to the gradually decreasing cross-sectional area. According to Bernoulli's principle, the increased flow velocity leads to a decrease in static pressure, thus creating a local low-pressure zone in the constriction section. This low-pressure zone has a suction effect on the waste in the toilet bowl, helping the waste to quickly enter the pipe and reducing waste residue. At the same time, the smooth flow velocity change also reduces the noise generated during flushing.

[0019] 2. In this invention, the buffer section is internally provided with a first curved segment, a straight segment, and a second curved segment, wherein the radius of curvature of the second curved segment is smaller than that of the first curved segment, and the segments are smoothly connected tangentially. This design ensures that the water flow changes direction smoothly and continuously during the turning process, effectively reducing local energy loss caused by abrupt changes in flow direction, thereby reducing the risk of dirt deposition or blockage in the pipe and improving the pipe's anti-clogging capability.

[0020] 3. In this invention, the included angle of the tangents at both ends of the first curved segment is set to a preset angle. Under normal water seal height conditions, this included angle can achieve a good balance between friction loss and local loss in the water flow: an appropriate included angle prevents the pipe length from becoming too long, thereby reducing friction loss; at the same time, it avoids excessive local resistance caused by an excessively small radius of curvature. Therefore, it can maintain sufficient siphon power while avoiding excessive local energy dissipation, thus optimizing the overall sewage discharge performance.

[0021] 4. In this invention, the cross-section of the siphon section is designed to be elliptical, and along the fluid flow direction, the difference between its major and minor axes gradually decreases (the major axis gradually shortens and the minor axis gradually increases), causing the cross-sectional shape to gradually approach a circle from a flat shape. This gradual change in structure effectively reduces the energy loss from local eddies and turbulence generated when water flows in the pipe, allowing the water to pass through the siphon section more smoothly. This facilitates the rapid establishment and maintenance of a stable siphon flow, while also reducing operating noise caused by turbulence.

[0022] 5. In this invention, the elliptical cross-section of the inlet section dissipates the tangential kinetic energy of the rotating water flow through a sharp turn at the end of its short axis, suppressing excessively rapid increases in axial velocity and maintaining the hollow channel in the center of the inlet to prevent premature air closure and the generation of suction noise. Simultaneously, the contraction section also adopts an elliptical cross-section, with its major and minor axes decreasing synergistically along the flow direction, achieving cross-sectional area contraction to accelerate suction while maintaining a smooth flow transition. These two elements work together to achieve a good balance between suction efficiency and quiet operation. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the device of the present invention;

[0024] Figure 2 for Figure 1 A sectional view;

[0025] Figure 3 for Figure 2 Enlarged view of point A;

[0026] Figure 4 This is a cross-sectional view of the device of the present invention;

[0027] Figure 5 This is a cross-sectional view of the device of the present invention (angle between the tangents at the endpoints of the first curve).

[0028] Figure 6 This is a structural diagram of the device of the present invention (schematic diagram of rotating water flow entering);

[0029] Figure 7 This is a cross-sectional view of the device of the present invention (short axis schematic diagram at different positions).

[0030] Figure 8 This is a partial cross-sectional view of the device of the present invention (schematic diagram of the major axis at different positions).

[0031] Figure 9 This is a cross-sectional view of an existing jet siphon pipe;

[0032] Figure 10 This is a cross-sectional view of an existing drop pipe.

[0033] Figure 11 A schematic diagram of the existing water trap angle;

[0034] in:

[0035] 10. Pipe body; 20. Sewage inlet section; 21. Sewage inlet; 22. Contraction section; 30. Siphon section; 31. Buffer section; 32. First curved section; 33. Straight section; 34. Second curved section; 35. Turning section; 40. Sewage discharge section; 50. Water cover.

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0037] The present invention will be further described below through specific embodiments.

[0038] See Figures 1 to 3A siphon pipe device includes a pipe body 10, which is through-flowing along its extension direction to form a flow channel for fluid and waste to pass through. Specifically, the pipe body 10 has a waste inlet section 20 and a siphon section 30 connected in sequence. One end of the waste inlet section 20 has a waste inlet 21 for receiving flushing water and waste from the toilet bowl, and the other end is connected to the siphon section 30. A contraction section 22 is provided at the connection end between the waste inlet section 20 and the siphon section 30. The cross-sectional area of ​​the contraction section 22 gradually decreases along the fluid flow direction of the pipe body 10, and the cross-sectional area of ​​the waste inlet 21 is larger than the cross-sectional area of ​​the initial end of the contraction section 22, thus forming a wide-to-narrow inlet structure. The siphon section 30 is connected to the smallest cross-sectional end of the contraction section 22, i.e., the end of the contraction section 22. Simultaneously, the cross-sectional area of ​​the siphon section 30 is larger than the smallest cross-sectional area of ​​the contraction section 22. It should be noted that the cross-section mentioned in this embodiment refers to the cross-section perpendicular to the fluid flow direction within the pipe body 10.

[0039] In this embodiment, the inlet section 20 of the pipe body 10 is provided with an inlet 21. A gradually decreasing cross-section constriction section 22 is connected behind the inlet 21. The end of the constriction section 22 is then connected to a siphon section 30 with an enlarged cross-section, forming a flow channel shape with a large inlet 21, a small constriction section 22, and a large siphon section 30. This shape corresponds to the structure of a fish's mouth when feeding: fish have a large mouth opening, followed by a small pharynx, and then a gradually enlarging cavity. In this embodiment, the inlet 21 corresponds to the fish's mouth opening, the constriction section 22 corresponds to the fish's pharynx, and the siphon section 30 corresponds to the enlarged cavity.

[0040] According to the principle of fluid continuity, the volumetric flow rate Q (m³ / s) through any cross-section of a pipe remains constant per unit time when flowing within it. The flow rate Q, velocity v (m / s), and cross-sectional area S (m²) satisfy the relationship: Q = v·S. Simultaneously, the total water consumption V and flushing time t satisfy: V = Q·t. In toilet design standards, the total water consumption V and flushing time t are essentially fixed values, therefore the average flow rate Q also remains essentially constant. When Q remains constant, a decrease in cross-sectional area S inevitably leads to an increase in velocity v. That is, as water flows through the contraction section 22, the velocity gradually increases due to the gradually decreasing cross-sectional area.

[0041] According to Bernoulli's principle, under ideal conditions where changes in height and energy losses are negligible, an increase in flow velocity leads to a decrease in pressure. Therefore, as the water flow accelerates within the contraction section 22, its static pressure decreases, creating a localized low-pressure zone at the minimum cross-section of the contraction section 22.

[0042] Employing the aforementioned biomimetic structure, the low-pressure zone acts on the toilet bowl through the inlet 21, generating a suction effect to help quickly draw waste into the pipes. The water then enters the gradually expanding siphon section 30, where the flow velocity decreases steadily and the pressure gradually recovers, facilitating the formation of a stable siphon flow. Simultaneously, since the inlet section 20 lacks bottom spray holes, all flushing water is used to wash the pot surface, effectively reducing the residue of sticky waste. The smooth transition from contraction to expansion also reduces turbulence and impact noise, and the siphon section 30 has a sufficiently large cross-section, lowering the risk of clogging.

[0043] In this embodiment, the siphon section 30 includes a buffer section 31 and a turning section 35. One end of the buffer section 31 is connected to the smallest cross-sectional end of the contraction section 22, and the other end of the buffer section 31 is connected to the turning section 35. The buffer section 31 is used to receive the high-speed water flow from the contraction section 22, allowing it to decelerate smoothly in the gradually expanding channel. The turning section 35 is connected to the buffer section 31 and is used to change the direction of the water flow, causing it to turn downwards and discharge.

[0044] At the connection between the buffer section 31 and the turning section 35, the lowest point L1 of its inner wall forms the water cover 50 of the siphon section 30. This water cover 50 refers to the static liquid surface formed by water remaining in the pipe when the pipe is not flushing. The height of the water cover 50 is determined by the lowest point L1; that is, the water cover 50 passes through the lowest point L1 and is horizontal, thus forming a stable seal within the pipe and preventing odors from flowing back to the toilet bowl.

[0045] In this embodiment, the cross-section of the sewage inlet section 20 is elliptical, with a major axis and a minor axis. After the rotating water flows out from the toilet brush ring hole, it rotates along the surface of the toilet bowl and enters the sewage inlet 21. Under the action of centrifugal force, the water flows along the inner wall of the sewage inlet section 20, and a hollow channel is naturally formed in the center of the sewage inlet 21, which facilitates the continuous overflow of air in the pipe.

[0046] When the axial velocity of the water flow is too high, the water will prematurely rush into the pipe, closing off the hollow channel in the center of the inlet 21 from all sides. This prevents air from continuously escaping from the pipe, resulting in vibration and noise. See also Figure 6To address this issue, this implementation utilizes the geometric properties of an elliptical cross-section: the radius of curvature is smaller at the endpoint of the minor axis of the elliptical cross-section. When rotating water flows through this region, the rapid change in flow direction results in localized energy loss, reducing the rotational speed of the water. This reduced rotational speed weakens the centrifugal wall-attaching effect of the water flow. More importantly, the dissipation of rotational kinetic energy limits the rapid increase in axial velocity—because the initial total kinetic energy of the water flow is limited, after some energy is dissipated, the remaining energy for axial acceleration is correspondingly reduced, thus preventing excessive axial velocity from causing premature closure of the hollow channel. With proper flow velocity control, the scouring time is correspondingly extended, but the hollow channel is maintained, allowing air to continuously escape, thereby avoiding noise caused by the intake of additional air.

[0047] Meanwhile, along the fluid flow direction of the pipe body 10, the minor axis of the constriction section 22 gradually decreases, and the major axis of the constriction section 22 gradually decreases. That is, the cross-sectional area of ​​the constriction section 22 gradually decreases along the flow direction. This constriction structure mainly acts on the axial component of the water flow: by reducing the cross-sectional area, the axial flow velocity is increased, and according to Bernoulli's principle, a local low-pressure zone is formed at the end of the constriction section 22, enhancing the suction capacity for toilet waste. In practical applications, the minor axis length of the constriction section 22 ranges from 46-50 mm; the major axis length ranges from 82-84 mm. For example, Figure 7 The minor axis lengths at positions ① and ② of the middle sewage inlet section 20 are 84.3 mm and 46.5 mm, respectively. Figure 8 The major axis lengths of positions ① and ② in the middle sewage inlet section are 104.2 mm and 82.9 mm, respectively, and ② is the area where the contraction section 22 is located.

[0048] It should be noted that the energy dissipation caused by the elliptical cross-section and the acceleration effect of the contraction section 22 on the axial flow are not contradictory. The contraction section 22 (whose cross-sectional area gradually decreases along the flow direction) mainly acts on the axial component of the water flow: by reducing the cross-sectional area, the axial flow velocity is increased, and according to Bernoulli's principle, a local low-pressure zone is formed at the end of the contraction section 22, enhancing the suction capacity for toilet waste. The elliptical cross-section mainly acts on the rotational component of the water flow: the sharp turn at the end of the minor axis dissipates some rotational kinetic energy, preventing excessive axial velocity. Both regulate the water flow from the axial and tangential dimensions respectively, jointly achieving a balance between accelerated suction and stable noise reduction.

[0049] In this embodiment, see Figure 7 and Figure 8The siphon section 30 has an elliptical cross-section with a major axis and a minor axis. Along the fluid flow direction of the pipe body 10, the difference in length between the major and minor axes of the siphon section 30 gradually decreases; specifically, the major axis gradually decreases while the minor axis gradually increases. This means the flatness of the elliptical cross-section gradually decreases, and the shape tends towards a circle. This cross-sectional change helps reduce local eddies and energy losses generated when water flows within the pipe, allowing the water to flow more smoothly through the siphon section 30, thus facilitating the formation of a stable siphon flow. In practical applications, the length of the major axis of the siphon section 30 ranges from 82-54 mm, and the length of the minor axis ranges from 46-57 mm. For example, Figure 7 The minor axis lengths at positions ③④⑤⑥⑦⑧⑨ in the middle siphon segment are 51.4 mm, 52 mm, 52 mm, 53.6 mm, 53.6 mm, 53.6 mm, and 56.9 mm, respectively. Figure 8 The major axis lengths at positions ③④⑤⑥⑦⑧⑨ in the middle siphon section are 86.4 mm, 85.6 mm, 79.5 mm, 69 mm, 62.5 mm, 58 mm, and 54 mm, respectively. During the flow, the cross-section is circular when the major and minor axis lengths are equal; subsequently, their size relationship is reversed. (See [reference needed]). Figure 8 At position ⑨, the original short axis becomes the long axis, and the original long axis becomes the short axis.

[0050] In this embodiment, to further reduce energy loss of water flow within the pipe and improve sewage discharge efficiency and anti-clogging capability, the path design is based on the following planar physical model: Under the condition of constant frictional resistance, a path from the starting point to the ending point is designed to maximize the kinetic energy of the particle upon reaching the ending point. The starting point is located below the ending point, and both the initial and final velocities are horizontal and in the same direction. The resulting path design principle is: the path length should be as short as possible, and the starting and ending points should be connected by curves at both ends of the path, with the curvature of the curves being gentle and continuous.

[0051] Based on the above principles, this embodiment adopts a straight path between the lowest point L2 of the pipeline (i.e., the lowest point where the sewage inlet section 20 connects to the buffer section 31) and the water cover 50 (i.e., the horizontal plane where the lowest point of the buffer section 31 connects to the turning section 35) to shorten the path length. At both ends of the straight path, curved segments connecting the starting point and the ending point are respectively set to ensure a smooth transition of the flow direction.

[0052] Specifically, a first curved segment 32 extending along the fluid flow direction of the pipe body 10 is formed in the area where the lowest point L2 of the inner wall where the buffer section 31 and the contraction section 22 meet. This first curved segment 32 is used to connect the end of the sewage inlet section 20 with the straight section 33. Its radius of curvature R1 is relatively large (for example, 97.5 mm), that is, its curvature is small, so that the direction of water flow changes gently when it enters the buffer section 31 from the contraction section 22, reducing local energy loss.

[0053] A second curved segment 34 extending along the fluid flow direction of the pipe body 10 is formed in the region where the lowest point L1 of the inner wall where the buffer section 31 and the turning section 35 meet. The radius of curvature R2 of the second curved segment 34 is smaller than the radius of curvature R1 of the first curved segment 32. This second curved segment 34 is used to connect the straight segment 33 and the turning section 35. Its radius of curvature is small (for example, a minimum of 20 mm, and gradually increases along the flow direction to smoothly connect the straight segment 33), that is, its curvature is large. See [reference needed]. Figure 4 This design allows the water flow to change direction quickly before entering the turning section 35, while the gradual change in curvature prevents flow separation, thus achieving efficient turning within a limited space.

[0054] The first curved segment 32 and the second curved segment 34 are connected by a straight segment 33, with both ends of the straight segment 33 connected to and tangent to the first curved segment 32 and the second curved segment 34, respectively. This ensures a continuous change in curvature throughout the path, avoiding abrupt changes. This pipe design minimizes energy loss from water flow and waste during flushing and drainage, facilitating the smooth discharge of waste and improving the pipe's anti-clogging performance.

[0055] In this embodiment, along the fluid flow direction of the pipe body 10, the angle α between the tangent at the starting point of the first curve and the tangent at the ending point of the first curve is 92-108°. This angle refers to the total angle by which the direction of the water flow changes when it flows within the first curve segment 32. See [reference needed]. Figure 5 .

[0056] Based on the aforementioned path design principles, a straight path is used to connect the lowest point L2 of the pipeline and the water cover 50, with curved transitions at both ends. For example, the first curved segment 32 at the connection point uses an arc with a radius of curvature R1 of 97.5 mm and an included angle of 100 degrees between its two tangents. Under these parameters, the change in water flow direction is relatively gradual, local resistance loss is minimized, which helps maintain the kinetic energy of the water flow and reduces energy dissipation caused by sudden changes in direction.

[0057] It should be noted that the siphon effect mainly depends on the vertical drop from the highest point of the pipe's inner wall to the outlet. When the toilet's design dimensions are limited and the vertical drop from the water seal point to the outlet is not significantly different, the angle of the trap (i.e., the tangent angle of the first curve segment 32) has a significant impact on siphon performance. This angle α is related to the vertical height and horizontal distance between the water seal point and the lowest point L2 of the pipe; for example, the value of angle α ranges from 92° to 108°. According to general design standards, the total water seal height h (i.e., the vertical height from the water seal surface 50 to the lowest point of the siphon section 30) should not be less than 108 mm. See [reference needed]. Figure 5 .

[0058] With the vertical height and horizontal distance remaining constant, the size of the included angle affects the radius of curvature R1 and arc length of the first curve segment 32, thus affecting the overall length of the pipe. According to the principle of fluid energy conservation, shortening the pipe length helps reduce energy loss along the flow path. However, if the radius of curvature is too small or the arc length is too short, the change in flow direction will accelerate, increasing local energy loss. The improvement of the pipe's anti-clogging function depends on the relative magnitude of these two types of energy loss: if the reduction in friction loss along the upward path is greater than the increase in local loss in the first curve segment 32, the overall energy loss decreases, and the anti-clogging function improves; conversely, it decreases.

[0059] In this embodiment, selecting an included angle within a set range (e.g., 100 degrees) can achieve a better overall effect under common water seal height and horizontal distance conditions. That is, it maintains sufficient siphon power while avoiding excessive local energy loss, thereby improving the sewage discharge capacity and anti-clogging performance of the pipeline.

[0060] The piping device in this embodiment also includes a drain section 40. This drain section 40 is positioned relatively level with the siphon section 30, and its inlet end is connected to the end of the siphon section 30. Vertically, the drain section 40 is located below the siphon section 30 and the inlet section 20, thus utilizing gravity to allow any sediment or residual liquid present in the pipe to flow naturally to the drain section 40. The outlet end of the drain section 40 is configured for connecting to an external drain pipe to discharge waste outside the device.

[0061] Based on this, this embodiment also proposes a toilet, including a bowl body and the aforementioned siphon pipe device. The bowl body has a toilet bowl that is wider at the top and narrower at the bottom. Several brush ring holes are evenly distributed around the top of the toilet bowl in a circumferential direction for spraying rotating water jets onto the inner wall of the toilet bowl during flushing. The bottom of the toilet bowl is connected to the sewage inlet 21 so that flushing water and waste can smoothly enter the pipe device.

[0062] The piping system is installed below the toilet bowl according to the aforementioned structure. Its inlet section 20, constriction section 22, siphon section 30, and outlet section 40 are connected sequentially, forming a complete passage from the toilet bowl to the external drain pipe. Based on this structure, the toilet flushing process is as follows:

[0063] The flushing water flows out from the brush ring hole at the top of the toilet bowl, swirling along the inner wall to form a rotating water flow. The rotating water flow carries waste, which adheres to the inner wall of the toilet bowl under centrifugal force, and then rotates into the waste inlet 21. During this process, a hollow channel naturally forms in the center of the waste inlet 21, allowing air inside the pipe to continuously escape upwards, preventing air blockage.

[0064] After entering the sewage inlet section 20, the water flows sequentially through the sewage inlet 21, the contraction section 22, and the siphon section 30. Because the cross-sectional area of ​​the sewage inlet 21 is larger than that of the beginning of the contraction section 22, the water flow gradually accelerates within the contraction section 22. According to Bernoulli's principle, the increased flow velocity leads to a decrease in static pressure, creating a localized low-pressure zone at the end of the contraction section 22. This low-pressure zone is fed back to the bottom of the toilet bowl through the sewage inlet 21, creating a suction effect on the waste in the toilet bowl and helping it to quickly enter the pipes.

[0065] Subsequently, the water flows from the end of the contraction section 22 into the buffer section 31. The cross-sectional area of ​​the buffer section 31 gradually expands, causing the water flow to slow down smoothly and the pressure to gradually recover. The water continues to flow through the straight section 33, rising along a straight path to near the water surface 50. At the turning section 35, the water flow direction changes from upward to downward, and finally it is discharged into the external sewage pipe through the sewage discharge section 40.

[0066] As water continues to flow in, the siphon section 30 gradually fills with water. When the water flows over the highest point of the siphon section 30 and forms a full-pipe flow, negative pressure is generated inside the pipe under the action of gravity, and the siphon effect is established. After the siphon is formed, the water and waste in the toilet bowl are continuously pumped out until the water column in the pipe breaks.

[0067] After flushing stops, the water level in the pipe naturally drops. The water that remains at the lowest point L1 where the buffer section 31 and the turning section 35 connect forms a water cover 50, which can effectively seal the pipe and prevent odor backflow.

[0068] In this embodiment, the toilet's elliptical inlet section 20 utilizes the geometric characteristic of a smaller radius of curvature at the minor axis endpoint to dissipate local energy as the rotating water flows through it. This moderately reduces the tangential kinetic energy of the rotating water flow, effectively maintaining the hollow channel in the center of the inlet 21 and preventing premature air closure that could generate suction noise. The water then enters the contraction section 22, where the cross-sectional area gradually decreases along the flow direction, causing the water flow to accelerate smoothly and the static pressure to drop, forming a local low-pressure zone that enhances suction force. The smooth flow channel, which contracts first and then expands, reduces noise generated by water impacting the pipe wall and turbulent pulsations. Finally, the water enters the siphon section 30 with a sufficiently large cross-section, allowing waste to pass through smoothly and be discharged without obstruction, avoiding stagnation or residue in the pipe. Thus, this embodiment of the toilet achieves quiet operation while ensuring efficient waste disposal.

[0069] In this invention, the terms "first," "second," and "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," and "rear" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A siphon pipe device, comprising a pipe body; the pipe body having a sludge inlet section and a siphon section connected in sequence; one end of the sludge inlet section having a sludge inlet, and the other end connected to the siphon section; characterized in that, The inlet section is connected to the siphon section at a constriction section. The cross-sectional area of ​​the constriction section gradually decreases along the fluid flow direction of the pipe body. The cross-sectional area of ​​the inlet is larger than the cross-sectional area of ​​the starting end of the constriction section. The siphon section is connected to the smallest cross-sectional end of the constriction section. The cross-sectional area of ​​the siphon section is larger than the smallest cross-sectional area of ​​the constriction section.

2. The siphon pipe device as described in claim 1, characterized in that, The siphon section includes a buffer section and a turning section. One end of the buffer section is connected to the smallest cross-sectional end of the contraction section, and the other end of the buffer section is connected to the turning section. The horizontal plane at the lowest point of the inner wall of the connection between the buffer section and the turning section constitutes the water cover of the siphon section.

3. The siphon pipe device as described in claim 2, characterized in that, The region where the lowest point of the inner wall where the buffer section and the contraction section meet forms a first curved segment extending along the fluid flow direction of the pipe body; the region where the lowest point of the inner wall where the buffer section and the turning section meet forms a second curved segment extending along the fluid flow direction of the pipe body, the radius of curvature of the second curved segment being smaller than the radius of curvature of the first curved segment; the first curved segment and the second curved segment are connected by a straight segment, and both ends of the straight segment are connected to and tangent to the first curved segment and the second curved segment, respectively.

4. The siphon pipe device as described in claim 3, characterized in that, The radius of curvature of the lowest point of the first curve segment is 95.5-98 mm, and the radius of curvature of the lowest point of the second curve segment is 20-22.5 mm.

5. A siphon pipe device as described in claim 3, characterized in that, Along the fluid flow direction of the pipe body, the angle between the tangent at the starting point of the first curve segment and the tangent at the ending point of the first curve segment is 92-108°.

6. A siphon pipe device as described in claim 1, characterized in that, The cross-section of the siphon section is elliptical, with a major axis and a minor axis; and along the fluid flow direction of the pipe body, the difference in length between the major axis and the minor axis of the siphon section gradually decreases.

7. A siphon pipe device as described in claim 1, characterized in that, The cross-section of the siphon section is elliptical, with a major axis and a minor axis; and along the fluid flow direction of the pipe body, the length of the major axis of the siphon section gradually decreases, while the length of the minor axis of the siphon section gradually increases.

8. A siphon pipe device as described in claim 1, characterized in that, The inlet section has an elliptical cross-section with a major axis and a minor axis; along the fluid flow direction of the pipe body, the minor axis of the constriction section gradually decreases, and the major axis of the constriction section gradually decreases.

9. A siphon pipe device as described in claim 8, characterized in that, The minor axis length of the cross-section of the contraction section ranges from 46 to 50 mm; the major axis length of the cross-section of the contraction section ranges from 82 to 84 mm.

10. A toilet, comprising a bucket body, wherein the bucket body is provided with a toilet bowl, characterized in that, It also includes a siphon pipe device according to any one of claims 1 to 9, wherein the bottom of the toilet bowl is connected to the sewage inlet.

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