CN202466763U - Sitting and squatting integrated multifunctional toilet bowl - Google Patents

Abstract

The utility model discloses a sitting and squatting integrated multifunctional toilet, which comprises a flip toilet and a squatting pan, wherein the flip toilet includes a flip toilet, a bracket, a rotating mechanism and a panel, and the panel and the bracket are installed on the plane where the squatting pan is located And they are all located at the back of the urinal mouth of the squatting toilet. The flipping toilet is connected to the bracket through the rotating mechanism and can rotate around the rotating shaft to form a horizontal sitting state and a vertical homing state buckled with the panel. After the flipping toilet returns to its original position, the toilet can be flushed . The utility model realizes the integrated design of sitting and squatting, and adopts a microcontroller to automatically control the switching, and has the advantages of reasonable use, water saving, safety and reliability, and the like.

Description

Sitting and squatting integrated multifunctional toilet

technical field

The utility model discloses a sitting and squatting integrated multifunctional toilet, which belongs to the technical field of manufacturing sanitary ware for daily use according to the International Patent Classification (IPC), and in particular relates to a multifunctional toilet structure combining a toilet and a squatting pan . the

Background technique

The official name of the toilet is the toilet, which is a daily sanitary ware for defecation. From the invention of the flush toilet at the end of the sixteenth century to the improvement of the flush toilet by the British watchmaker Alexander Cummings, to the modern high-tech intelligent toilet, The toilet has experienced a history of more than 400 years. The current several types of toilets are as follows:

1. Traditional squatting toilet: its advantages are simple and easy to clean, but the disadvantage is that it can only be used while squatting. After squatting for a long time, it will get tired, and people with poor health will faint. It is inconvenient for the elderly, weak, sick, disabled, pregnant, etc. the use of crowds;

2. Ordinary toilet: it is generally a ceramic product, which integrates a water tank and a switch, and can be used while sitting, but the disadvantage is that it takes up a lot of space (not suitable for small-sized homes), and its height cannot be adjusted for a fixed structure. The data in engineering shows that the knee height of a person in a sitting posture is between 410-549mm, so ordinary toilets on the market will cause discomfort to people of different heights when going to the toilet, especially for taller people and minors or Children will have the above problems when using toilets of the same height in public places such as hotels or shopping malls;

3. The modified product of the ceramic toilet: the toilet is deformed and shortened, and the edge of the urinal is widened to form a platform, which can be directly used as a squatting toilet; in addition, it can also be used by sitting on it after the toilet cover is put down, the toilet cover There are support feet at the bottom of the board. However, there are the following problems in use, and there are still many problems in the product:

(1) Should the user squat on the toilet, should he take off his shoes? If you don't take off your shoes, the dirt under the soles will accumulate on the surface of the squatting toilet, which is unhygienic. If you have to clean it every time, the workload will inevitably be heavy;

(2) The user squats on the toilet, about 35cm from the ground. This height seems to be no problem, but the user will be restricted. For example, the elderly and users with high blood pressure may have accidents. If they accidentally faint and fall wait;

(3) When the user sits and uses the toilet, it is difficult to dispose of the clothes, because the sitting cover is very close to the standing table, only about 3-4cm, and the clothes may touch the platform, which is unhygienic, and due to the overall height Shorter, not suitable for taller people;

(4) The seat cover is easily damaged and needs to be replaced frequently;

4. Chinese patent document CN101092828 discloses a dual-purpose squatting toilet. The squatting pan is movably provided with a toilet. The invention can meet the selection requirements of toilet users of different ages and different physical states, and solves the problem of the existing toilets There is only a single configuration of sitting toilet or squatting toilet. The toilet user has the disadvantage of sitting but not sitting and squatting if he wants to squat. However, the toilet in this document is directly installed on the squatting toilet, which is extremely inconvenient to use and needs to be moved manually. Open the toilet to use the squat toilet. Documents such as application numbers 201010556217.2 and 200820000265.1 also disclose toilet structures suitable for both squatting and sitting, but the design of the above scheme is not reasonable enough and inconvenient to use.

Contents of the invention

Aiming at the deficiencies of the prior art, the utility model provides a sit-and-squat integrated multifunctional toilet with reasonable structure, safety and reliability. The humanized design of the drying device and the safety handrail can fully meet the needs of different groups of people when going to the toilet. the

In order to achieve the above object, the utility model is achieved through the following technical solutions:

A sitting and squatting integrated multifunctional toilet, including a flip toilet and a squatting pan. The brackets are installed on the plane where the squatting pan is located and are all located behind the urinal opening of the squatting pan. The flipping toilet is connected to the bracket through a rotating mechanism and can rotate around the rotation axis to form a horizontal toilet state and a vertical homing state buckled with the panel. The panel is vertically fixed on the plane where the squatting pan is located, and the panel is provided with a snap-fit cover matched with the overturned toilet, and the toilet is flushed when the overturned toilet and the sealing ring on the inner peripheral side of the snap-fit cover are pressed together.

Further, the inner cavity of the panel snap-fit cover communicates with the flushing water pipe, the water outlet of the flush water pipe is arranged on the top of the panel snap-fit cover and a contact switch is installed at the water outlet, and the mouth of the flipped toilet is provided with a ring-shaped flushing water flow. The flushing channel has a number of flushing holes along the circumference, and the water inlet end of the above-mentioned flushing channel is matched with the contact switch, and the contact switch is touched when the toilet is turned over and the panel fastening cover is fastened to open the flushing pipeline for flushing toilet. the

Further, the bottom end of the rear side of the inverted toilet is provided with a sewage outlet, and is connected to the sewage pipe through a soft elbow. A guide pipe is arranged between the soft elbow and the sewage pipe, the soft elbow is connected with the guide pipe, and the other end of the guide pipe extends into the sewage pipe to form a retractable sewage pipe structure. the

Further, the support includes a lifting beam and a guide rod. The two ends of the lifting beam are sleeved on the guide rods on both sides and move up and down along the guide rods. The guide rods on both sides are fixed on the plane where the squatting pan is located, and the lifting beam is formed by The driving mechanism controls its up and down movement. The telescopic rod of the driving mechanism is connected with the lifting beam. the

Further, the driving mechanism is an elevator or an electric elevator or a telescopic hydraulic cylinder, wherein the elevator or the electric elevator adopts screw transmission to control the lifting movement of the beam. the

Further, the rotating mechanism includes a rotating plate, a supporting plate and a rotating shaft. The rotating plate is arranged on the bottom surface of the inverted toilet and is fixedly connected. The supporting plate is connected with the lifting beam to form a bracket for the inverted toilet and the rotating plate. The rotating end of the rotating plate The rotating shaft is connected with the output shaft of the driving motor. the

Further, the dryer installed on the side wall of the panel is used to dry the inner cavity of the flushed toilet in the homing state. The dryer includes an electric heating rod and a matching blowing mechanism. In the channel of the panel within the snap-fit range. the

Further, the mouth of the reversible toilet is provided with a matching heatable seat cushion, which is connected with a temperature sensor to monitor and control the heating temperature. the

Furthermore, the squatting pan described above is an invisible squatting pan, and the urinal opening is provided with a cover plate, which can move back and forth in translation to open or close the urinal opening. the

Further, the bottom surface of the squatting pan is connected to a sewage pipe, and the sewage pipe is connected to the sewage pipe of the flip toilet, and the confluence of the two is in a Y shape, and the sewage pipe after the confluence is a siphon structure. the

The utility model is automatically controlled by a micro-controller, and through inputting control signals, man-machine dialogue is preferably realized. There are toilet control keys and squatting pan control keys on the control panel of the microcontroller, wherein the toilet control keys include start, rise, fall and return; the squatting pan control keys include start and flush. the

When people need to use the sitting toilet, press the "Start" button to control the rotation of the power source motor of the turning mechanism through the microprocessor, so as to turn the toilet to a horizontal position for subsequent height adjustment; press "Up" or The "down" button controls the positive and negative rotation of the power source motor of the lifting mechanism through the microprocessor, so that the toilet can be raised or lowered, thereby adjusting the height of the toilet to meet the different needs of people of different heights; after use, press The "return" button controls the positive and negative rotation of the power source motor of the lifting mechanism through the microprocessor, so that the toilet returns to the initial position in height. When the toilet returns to the initial position in height, it is controlled by the microprocessor The rotation of the power source motor of the overturn mechanism turns the toilet over to the original position and automatically flushes water. When you need to use the squatting toilet, press the start button of the squatting toilet, open the safety cover, and you can use it;: when you finish using the squatting toilet, press the flush button to flush the squatting toilet, The safety cover is closed automatically. the

The utility model has an integrated sitting and squatting multifunctional toilet, which is improved and optimized on the basis of the existing squatting and sitting toilets, realizes the integration of sitting and squatting, and satisfies the toilet habits of different groups of people. The lifting mechanism adopted by this toilet can realize the free adjustment of the height of the toilet, which is suitable for the needs of people of different heights, and is more in line with ergonomics; the bottom of the toilet and the bracket are equipped with a rotating mechanism. When not in use, the toilet is turned over to the panel. This can not only make the toilet more beautiful, but also reduce the occupied space. The most important thing is to reduce the water consumption. When we finish using the toilet, by turning it over, the dirt will fall into the pipeline along the special curved surface inside the toilet by its own gravity. At this time, only a small amount of water can be added to clean the toilet, which has the effect of saving water. At the same time, there is no water in the toilet, and there will be no trouble of splashing water in the traditional toilet when using it, which is clean and hygienic; It can be opened by stepping on the button when in use, and the board can be closed after use to form an integral body with the floor, so there is no need to worry about objects slipping into it, preventing the elderly and children from stepping into the squatting pan. the

Description of drawings

Fig. 1 is a schematic diagram of the homing state of the utility model reversing toilet. the

Fig. 2 is another schematic diagram of the reversing toilet of the utility model in a homing state. the

Fig. 3 is a schematic diagram of the use state of the utility model reversible toilet. the

Fig. 4 is another schematic diagram of the utility model reversing toilet. the

Fig. 5 is a schematic diagram of a soft elbow of an inverted toilet. the

Fig. 6 is a sectional view of an inverted toilet. the

Fig. 7 is a partial schematic view of the reversing toilet. the

Fig. 8 is another usage status diagram of the present invention. the

Fig. 9 is another homing state diagram of the present invention. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

Embodiment: Please refer to Fig. 1 to Fig. 9, a sitting and squatting integrated multifunctional toilet, including a flipping toilet and a squatting pan 1, the flipping toilet is set on the plane where the squatting pan 1 is located, and the flipping toilet includes Flip toilet 2, support 3, rotating mechanism 4 and panel 5, wherein panel 5 and support 3 are installed on the plane where squatting pan 1 is located and are all positioned at the back side of the urinal mouth of squatting pan, and flipping toilet 2 is connected with support by rotating mechanism and can Rotate around the rotation axis 41 to form a horizontal toilet state (as shown in Figure 3 and Figure 4) and a vertical homing state (as shown in Figure 1 and Figure 2) that is buckled with the panel, and the panel 5 is vertically fixed on the plane where the squatting pan is located , and the panel is provided with a snap-fit cover 51 that matches the flip toilet. When the flip toilet 4 and the seal ring on the inner peripheral side of the snap-fit cover are pressed tightly, the toilet is flushed. The snap-fit cover of the panel can be set to form an inner groove of the panel. Or the outwardly protruding ring of the panel forms a fastening cover with the panel inside the ring, and the protruding ring matches the mouth of the toilet. The inner cavity of the panel snap-fit cover 51 communicates with the flush water pipe 6, the water outlet of the flush water pipe is arranged on the top of the panel snap-fit cover and a contact switch 61 is installed at the water outlet, and the bucket mouth of the overturned toilet 2 is provided with a ring-shaped flush water flow. The flushing channel has a number of flushing holes 21 in the circumferential direction, and the water inlet end of the flushing channel is matched with a contact switch, and when the toilet is turned over and the panel fastening cover is fastened, the contact switch is touched to open the flushing channel. To flush the toilet, as shown in Figure 6, the bottom end of the rear side of the inverted toilet 2 is provided with a sewage outlet 22, and is connected to the sewage pipe through a soft elbow 71, and the inner cavity of the inverted toilet is the flushing flow channel, and the water inlet end faces the sewage. The mouth is a curved surface structure that gradually decreases. A guide pipe 72 is provided between the soft elbow 71 and the sewage pipe 73. The soft elbow 71 is connected to the guide pipe 72 and sealed by an O-ring. The other end of the guide pipe 72 extends into the A retractable sewage pipe structure is formed in the sewage pipe.

Please refer to Fig. 1 to Fig. 3, support 3 comprises elevating beam 31 and guide rod 32,33, and elevating beam 31 two ends conduits are sleeved on the guide rods on both sides and move up and down along the guide rods, both sides guide rods are fixed on the The plane where the toilet is located, and the lifting beam 31 is controlled by the driving mechanism 36 to move up and down. The telescopic rod of the driving mechanism is connected with the lifting beam 31. The top ends of the two guide rods are respectively connected to the left and right handrails 34, 35, and the other ends of the handrails are fixed on the panel. . The driving mechanism 3 is a lift or an electric lift or a telescopic hydraulic cylinder, wherein the lift or the electric lift adopts screw transmission to control the lifting movement of the beam. the

Please refer to Fig. 1 or Fig. 2, the rotating mechanism 4 of the present utility model comprises a rotating plate 43, a supporting plate 42 and a rotating shaft 41, the rotating plate 43 is arranged on the bottom surface of the flip toilet 2 and is fixedly connected, the supporting plate 42 is connected with the lifting beam 31 and Form the bracket of the overturning toilet and the rotating plate, and the rotating end of the rotating plate 43 is connected with the output shaft of the driving motor through the rotating shaft 41 . the

As shown in Figure 3, a dryer 52 is installed on the side wall of the panel 5 to dry the inner cavity of the flushed toilet in the homing state. The dryer includes an electric heating rod and a matching blowing mechanism. In the channel of the panel within the homing snap fit range. The mouth of the reversible toilet 2 is provided with a matching heatable seat cushion 23, which is connected with a temperature sensor to monitor and control the heating temperature. the

Please refer to FIG. 1 or FIG. 3 , the squatting pan 1 is an invisible squatting pan, and its urinal opening is provided with a cover plate 10 , and the cover plate 10 can reciprocate and translate to open or close the urinal opening. the

Please refer to Fig. 4, the bottom surface of the squatting pan 1 is connected to the sewage pipe 11, which is connected to the sewage pipe of the overturned toilet, and the confluence of the two is a Y-shaped sewage pipe 74, and the sewage pipe after the confluence is a siphon structure 75. the

This utility model is caused by the problems encountered in going to the toilet at present, and the key problems to be solved mainly include the following four points:

1) Meet the requirements of various groups, including the elderly, weak, sick, disabled, pregnant and other special groups;

2) It must be able to meet people's living habits, such as squatting and sitting can be chosen by oneself;

3) To respond to the country's sustainable development policy, that is, the design of bathroom products must take water and energy saving into consideration;

4) It is necessary to solve the problems of splashing water, infection and hygiene when using the toilet.

In order to meet the above key needs, we decided to transform the traditional squatting pan into a new type of product that combines sitting and squatting, so that the key needs can be solved. Install a toilet, the toilet can not only be turned over, but also can be freely raised and lowered in height. the

The utility model has the following beneficial effects:

1.1 Respect the habits of the crowd

This set of sitting and squatting toilets, people can choose to use sitting toilets or squatting toilets according to their own habits, which can meet the needs of various groups of people, including special needs such as the elderly, the weak, the sick, the disabled, and pregnant. group;

1.2 Control of energy saving and environmental protection

At present, the country vigorously advocates scientific development and sustainable development, so the designed products must meet the requirements of energy saving. The toilet in this set of sitting and squatting integrated toilets we designed has the function of turning over, which can make the bathroom more beautiful , It can also reduce the space occupied by the toilet, and the most important thing is that it can also save water. When we finish using the toilet, we will use its own gravity to dump the feces into the pipeline by turning over the toilet, and only need to add a small amount of water to flush the toilet. Clean, so that it can save water;

1.3 Guaranteed comfort

Going to the toilet is one of the indispensable actions of everyone every day. If Yao Ming or children are allowed to sit on the toilet used by ordinary people, the toilet is too short for Yao Ming, and he has to bend his knees greatly, so that his knees will be sore after a long time; for children This kind of toilet is too high, and the feet cannot touch the ground when sitting on it. After a long time, not only the buttocks hurt but also the feet are sore. The data in ergonomics shows that the knee height of people in sitting posture is between 410-549mm. In order to adapt to people of different heights and make people go to the toilet more comfortable, our product design fully considers the principles of ergonomics. Adjust the height of the toilet according to your own height, so that everyone from a giant like Yao Ming to a child who can just walk can comfortably use our stepless toilet;

1.4 Protection against splashing water

Flip over so that there will be no residual water in the toilet, and there will be no splash of bacterial water during use, which is clean and hygienic; we have also designed a warm air drying device for the toilet cover, and when the toilet is turned over against the wall, it will be Dry the dryer, which can play a role in sterilization and reduce the occurrence of bacterial infection and other problems.

toilet structure design

1) Lifting mechanism

As shown in Figure 1 and Figure 2, considering the overall weight of a person sitting on the toilet is relatively large, the mechanism for controlling the lifting needs to ensure stable and reliable self-locking performance and safety device, so after accurate calculation, we adopted the electric push rod lift. The load range of the lift is 0-600kg to ensure the safety and reliability of the user during use, and there will be no accidents such as sudden slipping;

Working principle: The lift is controlled by the panel and equipped with a transformer, which can ensure a uniform and stable lifting speed, which will not be too fast or too slow. There are up and down buttons on the panel to control the positive and negative rotation of the motor to make the lift complete the lifting movement. Since the driving device is a screw drive, the whole movement process is stable and the self-locking performance is good;

2) Swivel mechanism

As shown in Figure 1 and Figure 3, the rotating mechanism consists of two parts, one part is installed on the bottom of the toilet, and the other part is installed on the bracket fixed on the movable end of the lift. Since the bracket is fixed on the lift, the flip of the toilet can be controlled by the motor to ensure that the toilet takes up less space when not in use;

Working principle: The motor shaft transmits the power through the coupling, and then transmits the power to the main shaft of the turning mechanism through the pulley, and controls the positive and negative rotation of the motor to make the turning mechanism complete the turning movement, that is, to make the toilet turn back and forth. , and then use the single-chip microcomputer to control the speed and rotation angle of the motor, so that the toilet can be turned to the preset position every time;

3) Flushing mechanism

The flushing mechanism is composed of two parts as shown in Figure 4, one part is the flushing flow channel inside the toilet, and the other part is the snap-fit cover and the connected water flow pipe;

Working principle: According to the design, the toilet should be flushed when it returns to the flush cover (snap cover), so when the toilet returns to the snap cover of the panel, since there is a flush pipe head Similar to the cone-shaped cover of the slide valve (that is, the contact switch), the cone-shaped cover will slide smoothly into a water outlet on the toilet, and at this time, the water source can be turned on, and the water can be flushed smoothly;

4) Sewage pipe

How to discharge the dirt in the toilet into the sewer is a big problem we encountered in the design process. The requirements of this kind of pipeline are different from ordinary pipelines. When the toilet is turned over, the pipeline is also turned and stretched, and the toilet goes up and down Sometimes the pipeline is also accompanied by lifting. After discussion, we designed the sewage pipe as shown in Figure 5. The whole pipe is similar to the usual cola straw, with an elbow. One end of the elbow is connected to the sewage outlet of the toilet, and the other end is connected to a pv pipe with a smaller diameter. (guide pipe) connection, and then nest the small-diameter pv pipe on the slightly larger-diameter pv pipe (drainage pipe) fixed on the floor, so that the two pv pipes can slide freely. lifting function;

5) Drying mechanism

As shown in Figure 3, a dryer is installed in the middle of the flush cover. When the toilet is leaning against the wall, it faces the toilet and dries the flushed toilet. This not only has a drying function, but also has a bactericidal effect, reducing the infection, cleanliness;

6) Safety device

Safety device is made up of two parts, has the auxiliary handrail shown in Figure 1 and the safety cover plate 10 of Figure 3. Considering the needs of the elderly, children, the disabled, pregnant women and other special groups, the installation of the auxiliary armrest is more in line with ergonomics. When needed, you only need to pull out the armrest to use it, which is convenient and reliable; the installation of the safety cover will form a Invisible squatting pan, when the use is finished, the safety cover is closed and integrated with the floor, so there is no need to worry about objects slipping into it, which can prevent the elderly, children, pregnant women and other people from accidentally stepping into the squatting pan and falling into it;

7) Seat cushion heating device

The device (as shown in Figure 3) is composed of a heating coil and a temperature sensor. When the temperature sensed by the temperature sensor is low in winter, the heating coil generates heat when the sitting start button is pressed, and the heat is transferred to the upper edge of the seat and the toilet , Solve the problem of cold toilet in winter, play a comfortable effect.

The above records are only examples of using the technical content of this creation. Any modifications and changes made by those who are familiar with this technology using this creation belong to the scope of patents claimed by this creation, and are not limited to those disclosed in the examples. the

Claims (10)

1. A sit-and-squat integrated multifunctional toilet, characterized in that: it includes an overturning toilet and a squatting pan, the overturning toilet is arranged on the plane where the squatting pan is located, and the overturning toilet includes an overturning toilet, a support, a rotating mechanism And the panel, wherein the panel and the bracket are installed on the plane where the squatting pan is located and both are located on the back side of the urinal mouth of the squatting pan. In the vertical homing state, the panel is vertically fixed on the plane where the squatting pan is located, and the panel is provided with a buckle cover that matches the flip toilet, and the toilet is flushed when the seal ring on the inner peripheral side of the flip toilet and the buckle cover is pressed tightly . 2. The sitting and squatting integrated multifunctional toilet according to claim 1, characterized in that: the inner cavity of the panel snap-fit cover communicates with the flushing pipe, and the water outlet of the flushing pipe is set on the top of the panel snap-fit cover and A contact switch is installed at the water outlet, and a ring-shaped flushing flow channel is arranged on the bucket mouth of the overturned toilet. When the cover is fastened with the panel, the contact switch is touched to open the flush water pipeline to flush the toilet. 3. The sitting and squatting integrated multifunctional toilet according to claim 1, characterized in that: the bottom end of the rear side of the overturned toilet is provided with a sewage outlet, and is connected with the sewage pipe through a soft elbow, and the overturned toilet The inner cavity of the toilet is a curved surface structure that gradually decreases from the water inlet end of the flushing channel to the sewage outlet. There is a guide pipe between the soft elbow and the sewage pipe. A telescopic sewage pipe structure is formed in the sewage pipe. 4. The sitting and squatting integrated multifunctional toilet according to claim 1, characterized in that: the support includes a lifting beam and a guide rod, and the guide rods at both ends of the lifting beam are sleeved on the guide rods on both sides of the lifting beam and run along the guide rod. Moving up and down, the guide rods on both sides are fixed on the plane where the squatting pan is located, and the lifting beam is controlled by the driving mechanism to move up and down. fixed on the panel. 5. The sitting and squatting integrated multifunctional toilet according to claim 4, characterized in that: the driving mechanism is a lift or an electric lift or a telescopic hydraulic cylinder, wherein the lift or electric lift is controlled by thread transmission Crossbeam lifting movement. 6. The sitting and squatting integrated multifunctional toilet according to claim 1, characterized in that: the rotating mechanism includes a rotating plate, a supporting plate and a rotating shaft, the rotating plate is arranged on the bottom surface of the flip toilet and is fixedly connected, the supporting plate and the lifting The beams are connected to form a bracket for turning over the toilet and the rotating plate, and the rotating end of the rotating plate is connected with the output shaft of the driving motor through the rotating shaft. 7. The sitting and squatting integrated multifunctional toilet according to claim 1, characterized in that: a dryer is installed on the side wall of the panel to dry the inner cavity of the toilet after flushing in the homing state, and the dryer It includes an electric heating rod and a matching blowing mechanism, and the electric heating rod and the blowing mechanism are arranged in the channel of the panel within the buckling range of the reversing toilet. 8. The sitting and squatting integrated multi-function toilet according to claim 1, characterized in that: the mouth of the flip toilet is provided with a matching heatable seat cushion, and the seat cushion is connected with a temperature sensor to monitor and control the heating temperature . 9. The sitting and squatting integrated multifunctional toilet according to claim 1, characterized in that: said squatting pan is an invisible squatting pan, and the urinal mouth is provided with a cover plate, which can be reciprocated and translated to open or close the toilet. pool mouth. 10. The sitting and squatting integrated multifunctional toilet according to any one of claims 1 to 9, characterized in that: the bottom surface of the squatting pan is connected to a sewage pipe, and the sewage pipe is connected to the sewage pipe of the flip toilet, and both The confluence is Y-shaped, and the sewage pipe after confluence is a siphon structure.

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