A sewer backwater prevention system and method thereof

Abstract

The application discloses a sewer anti-backflow system and a method thereof, and particularly relates to the technical field of valves, and solves the technical problems that the existing check valve is horizontally installed, dirt is accumulated at the bottom of the valve body, and the existing check valve needs to be manually closed and does not have a reminding function. The application comprises an upper pipe and a lower pipe which are connected and a controller, a stop valve mechanism is arranged between the upper pipe and the lower pipe, the stop valve mechanism is driven by a motor, the motor is electrically connected with the controller, an anti-backflow detection mechanism and a self-cleaning mechanism are arranged between the lower pipe and the stop valve mechanism, the anti-backflow detection mechanism and the self-cleaning mechanism are respectively electrically connected with the controller, and an anti-backflow reminding mechanism is further connected to the outside of the controller. The application is vertically installed, sewage and dirt are not left and accumulated, people can be timely informed of the sewer backflow situation, and people can conveniently inform the property or maintenance personnel to repair the building main water pipe at the first time.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically relating to a sewer anti-backflow system and method. Background Technology

[0002] Currently, to prevent sewage backflow in bathrooms and kitchens, check valves are typically installed on the drain pipes. Existing check valves, due to their structural characteristics, require horizontal installation. Their structure includes a valve body with an inlet, an outlet, and a baffle plate. The inlet has a baffle plate mounting cover with a through-hole connecting the inlet and outlet. The upper end of the baffle plate is hinged to the mounting cover, while the lower end hangs freely, covering the inlet. When sewage flows from the inlet to the outlet, it forces open the baffle plate, allowing the sewage to drain smoothly through the outlet. When not discharging sewage, the baffle plate hangs freely under its own weight, covering the through-hole on the mounting cover, thus preventing sewage backflow.

[0003] However, existing check valves rely solely on their own weight to prevent backflow when the through-hole is covered, which is not particularly strong. When the main water pipe of the building is blocked, severe backflow can occur in the branch pipes within the household, causing the check valve to fail (especially for residents on lower floors). Therefore, when installing existing check valves, a stop valve should be installed next to them to provide double protection. This is especially important when people need to leave for a long time. The stop valve should be closed to prevent the check valve from failing in case of severe sewage backflow when the main water pipe of the building is blocked, thus preventing sewage from overflowing and polluting the home environment.

[0004] However, the following technical problems may arise:

[0005] 1. Because the shut-off valve needs to be closed manually, people often forget to close it when they go on long trips. This can lead to the check valve failing when there is severe backflow of sewage, causing sewage to overflow and pollute the home environment.

[0006] 2. Since check valves must be installed horizontally, some sewage will remain in the valve body after drainage. Over time, dirt will accumulate at the bottom of the valve body. When the accumulation reaches a certain level, the valve body needs to be manually opened for cleaning and maintenance, which is time-consuming, laborious and inconvenient.

[0007] 3. Existing check valves do not have a warning function after backflow occurs in the sewers. People often only notice the problem after drainage is obstructed, which prevents them from notifying property management and maintenance personnel in a timely manner to repair the building's water pipes. Summary of the Invention

[0008] This invention provides a sewer backflow prevention system and method to solve the above-mentioned technical problems.

[0009] The technical solution adopted in this invention is as follows:

[0010] A sewer anti-backflow system includes an upper pipe and a lower pipe that are interconnected and connected, and a controller. A shut-off valve mechanism is provided between the upper pipe and the lower pipe. The shut-off valve mechanism is driven by a motor and is electrically connected to the controller. A backflow detection mechanism and a self-cleaning mechanism are provided between the lower pipe and the shut-off valve mechanism. The backflow detection mechanism and the self-cleaning mechanism are respectively electrically connected to the controller. A backflow reminder mechanism is also connected to the outside of the controller.

[0011] Preferably, the shut-off valve mechanism includes a connecting pipe and a ball valve core. The top end of the connecting pipe is sealed to the bottom end of the upper pipe. The ball valve core is installed inside the connection between the connecting pipe and the upper pipe. The ball valve core is rotatably connected to the upper pipe and the connecting pipe. The ball valve core is driven by the motor. The motor is fixedly connected to the connecting pipe or the upper pipe.

[0012] Preferably, the motor is located outside the lower tube and fixedly connected to the lower tube. A transmission mechanism is provided between the motor and the ball valve core. The transmission mechanism includes a worm gear. One end of the worm gear is fixedly connected to the output shaft of the motor, and the other end of the worm gear is rotatably connected to a support plate fixed outside the upper tube. A worm wheel that cooperates with the worm gear is provided on one side of the ball valve core.

[0013] Preferably, the backflow detection mechanism includes a liquid level sensor disposed on the connecting pipe, the liquid level sensor being electrically connected to the controller, and the sensing head of the liquid level sensor being disposed inside the connecting pipe.

[0014] Preferably, the self-cleaning mechanism includes a flushing port disposed inside the connecting pipe, the flushing port being inclined downwards, and an installation seat communicating with the flushing port being disposed outside the connecting pipe, the installation seat being connected to an external water supply pipe, the water supply pipe being controlled by a water pump, the water pump being electrically connected to the controller; the flushing head is disposed near the liquid level sensor head.

[0015] Preferably, the connecting tube is further provided with a funnel-shaped inner tube, the top edge of which is fixedly connected to the connecting tube, and the bottom end of which extends to the bottom of the backflow detection mechanism and the self-cleaning mechanism.

[0016] Preferably, the anti-watering reminder mechanism includes an Internet of Things (IoT) module electrically connected to the controller, and the IoT module is connected to an existing terminal.

[0017] Preferably, the anti-water warning mechanism further includes a light box, on which at least three different warning lights are provided.

[0018] Preferably, a reserve battery is provided on the outside of the controller, and the reserve battery is electrically connected to the controller, the motor, the backflow detection mechanism, the self-cleaning mechanism, and the backflow reminder mechanism.

[0019] A method for using a sewer backflow prevention system includes:

[0020] S1: The sewer waterproofing system is installed vertically between the drain outlet and the drain pipe. During operation, the liquid level sensor collects the liquid level information of the sewage. If the liquid level sensor detects the liquid level, it means that the sewage has backed up to the connecting pipe. Then the liquid level sensor transmits the signal to the controller, which controls the motor to start and rotates the ball valve core to close the channel, preventing backflow into the room and causing indoor environmental pollution.

[0021] S2: At the same time, the controller will send a backflow warning signal to people through the backflow reminder mechanism to notify them of the backflow in the sewer. People will then notify the property management or maintenance personnel to repair the main water pipe of the building.

[0022] The backflow warning system includes an IoT module and a light box. The IoT module remotely sends alerts to people's mobile phones or computers to remind them of backflow. The light box is affixed to a prominent position on the wall of the house to remind people of backflow.

[0023] S3: After the property management and maintenance personnel have completed the repair of the building's main water pipe, the sewage discharge is normal, the liquid level drops, and when the liquid level sensor does not detect the liquid level, it means that the sewage has been discharged. Then the liquid level sensor transmits the signal to the controller, the controller controls the motor to start, rotates the ball valve core to open the channel, and puts the device in normal working condition.

[0024] During the operation of the channel, sewage foam may accumulate in the connecting pipe. Therefore, the controller will periodically control the water pump to supply water to the water supply pipe and provide a certain pressure to the water flow. This will give the water flow a certain force to rush into the interior of the connecting pipe from the flushing port, thereby flushing away the sewage foam accumulated in and around the connecting pipe. At the same time, the controller will turn off the liquid level sensor when the water pump is working to prevent false sensing that could cause the channel to close. The duration of the water pump being open is preset in the controller. When the water pump is turned off, the controller will turn the liquid level sensor back on, and the device will work normally.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] 1. This device replaces the existing check valve and shut-off valve with a stop valve mechanism, which makes the structure simpler and has a stronger anti-backflow effect compared to the existing check valve.

[0027] 2. With the cooperation of the backflow detection mechanism and the controller, the gate valve mechanism can be opened and closed intelligently, eliminating the need for manual closing of the gate valve. This prevents people from forgetting to close the gate valve when they go out, which could lead to the check valve failing in the event of severe sewage backflow, causing sewage to overflow and pollute the home environment.

[0028] 3. This device is installed vertically, so there will be no sewage or dirt residue or accumulation inside the device, and there is no need to manually open the valve body for cleaning and maintenance.

[0029] 4. After a backflow of water occurs in the sewer, this device will promptly notify people of the backflow through the backflow reminder mechanism, so that people can notify the property management or maintenance personnel to repair the building's main water pipe as soon as possible. Attached Figure Description

[0030] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0031] Figure 1 This is a schematic diagram of a sewer anti-backflow system according to the present invention;

[0032] Figure 2 This is a schematic diagram of the internal structure of a sewer anti-backflow system according to the present invention;

[0033] Figure 3 This is a schematic diagram of the connecting pipe in this invention;

[0034] Figure 4 This is a schematic diagram of the structure of the light box in this invention;

[0035] Figure 5 This is a schematic diagram of the structure of a sewer anti-backflow system of the present invention when a housing is installed.

[0036] Figure Labels

[0037] 1-Upper pipe, 2-Lower pipe, 3-Controller, 4-Motor, 5-Connecting pipe, 6-Ball valve core, 7-Worm gear, 8-Worm, 9-Support plate, 10-Level sensor, 11-Flush port, 12-Mounting base, 13-Water supply pipe, 14-Funnel-shaped inner pipe, 15-IoT module, 16-Light box, 17-Indicator light, 18-Reservoir battery, 19-Buzzer, 20-Housing, 21-Base, 22-Motor support base. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] The following is combined with Figures 1-5 The present invention will be described in detail below.

[0041] Example 1:

[0042] A sewer backflow prevention system and method, in this embodiment, such as Figures 1-2 As shown, it includes an upper pipe 1 and a lower pipe 2 that are interconnected and connected, and a controller 3. A shut-off valve mechanism is provided between the upper pipe 1 and the lower pipe 2. The shut-off valve mechanism is driven by a motor 4. The motor 4 is electrically connected to the controller 3. A backflow detection mechanism and a self-cleaning mechanism are provided between the lower pipe 2 and the shut-off valve mechanism. The backflow detection mechanism and the self-cleaning mechanism are electrically connected to the controller 3 respectively. A backflow reminder mechanism is also connected to the outside of the controller 3.

[0043] It is worth mentioning that, in this embodiment, the controller 3 is an S7-1200 PLC.

[0044] The principle is as follows: During installation, the device must be installed vertically. The top of the upper pipe 1 is connected to the drain outlet, and the bottom of the lower pipe 2 is connected to the drain pipe. When sewage is being discharged normally from the drain outlet, the backflow detection mechanism detects that the water flow is normal, and drainage is normal. At this time, the shut-off valve is open. When sewage backflow occurs, the backflow detection mechanism detects that the sewage level reaches the connecting pipe 5. The backflow detection mechanism then transmits the detection signal to the controller 3 for processing. The controller 3 determines that sewage backflow has occurred and controls the shut-off valve to close, preventing sewage from flowing back from the drain pipe to the drain outlet and out, thus preventing pollution of the indoor environment. When the backflow detection mechanism detects no sewage backflow, i.e., when the liquid level drops, it reopens the shut-off valve, allowing the device to return to normal operating conditions. This device replaces existing check valves and shut-off valves with a shut-off valve mechanism, resulting in a simpler structure and stronger anti-backflow effect compared to existing check valves. Secondly, with the cooperation of the backflow detection mechanism and controller 3, the shut-off valve mechanism can intelligently open and close, eliminating the need for manual shut-off valve closure. This prevents situations where people forget to close the shut-off valve when leaving for a long time, leading to check valve failure and sewage overflow, polluting the home environment in the event of severe sewage backflow. Furthermore, this device is vertically installed, preventing sewage and dirt residue and accumulation inside, eliminating the need for manual valve opening for cleaning and maintenance. In the event of sewer backflow, the device promptly notifies residents of the backflow warning mechanism, allowing them to immediately contact property management or maintenance personnel for repairs to the building's main water pipe.

[0045] In this embodiment, as Figures 1-2 As shown, the shut-off valve mechanism includes a connecting pipe 5 and a ball valve core 6. The top end of the connecting pipe 5 is connected to the bottom end of the upper pipe 1 by flange bolts, and a sealing gasket is provided between the two flanges. The ball valve core 6 is installed inside the connection between the connecting pipe 5 and the upper pipe 1. The ball valve core 6 is rotatably connected to the upper pipe and the connecting pipe 5. A sealing ring is provided between the top of the ball valve core 6 and the channel of the upper pipe 1, and a sealing ring is also provided between the bottom of the ball valve core 6 and the channel of the connecting pipe 5. The ball valve core 6 is driven by the motor 4, and the motor 4 is fixedly connected to the connecting pipe 5 or the upper pipe 1.

[0046] The principle behind this device is that it adopts a ball valve structure, which allows for rapid opening and closing, low fluid resistance, good sealing performance, and a simple structure. Furthermore, it has better backflow prevention capabilities compared to existing check valves.

[0047] In this embodiment, as Figures 1-2As shown, the motor 4 is located outside the lower tube 2 and is fixedly connected to the lower tube 2. A transmission mechanism is provided between the motor 4 and the ball valve core 6. The transmission mechanism includes a worm gear 8. One end of the worm gear 8 is fixedly connected to the output shaft of the motor 4, and the other end of the worm gear 8 is rotatably connected to the support plate 9 fixed outside the upper tube 1. A worm wheel 7 that cooperates with the worm gear 8 is provided on one side of the ball valve core 6.

[0048] The principle is that the motor 4 drives the ball valve core 6 through the worm gear 8, which has the advantages of smooth transmission and low noise.

[0049] In this embodiment, as Figures 1-3 As shown, the backflow detection mechanism includes a liquid level sensor 10 disposed on the connecting pipe 5. The liquid level sensor 10 is electrically connected to the controller 3, and the sensing head of the liquid level sensor 10 is disposed inside the connecting pipe 5.

[0050] The principle is that the liquid level sensor 10 collects the liquid level information of the sewage. If the liquid level sensor 10 senses the liquid level, it means that the sewage has backed up to the connecting pipe 5. Then the liquid level sensor 10 transmits the signal to the controller 3, and the controller 3 controls the motor 4 to start and rotates the ball valve core 6 to close the channel, so as to prevent backflow into the room and cause indoor environmental pollution.

[0051] In this embodiment, as Figures 1-2 and Figure 4 As shown, the self-cleaning mechanism includes a flushing port 11 disposed inside the connecting pipe 5. The flushing port 11 is inclined downward. The connecting pipe 5 is also provided with a mounting base 12 communicating with the flushing port 11. The mounting base 12 is connected to an external water supply pipe 13. The water supply pipe 13 is controlled by a water pump. The water pump is electrically connected to the controller 3. The flushing head is disposed near the sensing head of the liquid level sensor 10.

[0052] The principle is that during the use of the channel, sewage foam may accumulate in the connecting pipe 5. Therefore, the controller 3 will periodically control the water pump to supply water to the water supply pipe 13 and provide a certain pressure to the water flow, so that the water flow has a certain force to rush into the interior of the connecting pipe 5 from the flushing port, thereby flushing away the sewage foam accumulated in and around the connecting pipe 5. At the same time, the controller 3 will turn off the liquid level sensor 10 when the water pump is working to prevent false sensing and cause the channel to close. The duration of the water pump being open is preset in the controller 3. When the water pump is turned off, the controller 3 will turn the liquid level sensor 10 back on, and the device will work normally.

[0053] In this embodiment, as Figure 2As shown, the connecting pipe 5 is further provided with a funnel-shaped inner pipe 14. The top edge of the funnel-shaped inner pipe 14 is engaged with and fixedly connected to the groove on the inner wall of the connecting pipe 5. The bottom end of the funnel-shaped inner pipe 14 extends to the bottom of the backflow detection mechanism and the self-cleaning mechanism.

[0054] The principle is that when the device is working normally, sewage enters the upper pipe 1 from the sewage outlet and reaches the connecting pipe 5. By setting the funnel-shaped inner pipe 14, the sewage flowing in the normal direction will not be misjudged by the liquid level sensor 10.

[0055] In this embodiment, as Figures 1-2 As shown, the anti-watering reminder mechanism includes an Internet of Things (IoT) module 15 electrically connected to the controller 3, and the IoT module 15 is connected to an existing terminal.

[0056] The principle is that the Internet of Things module 15 remotely sends signals to people's mobile phones or computer terminals to remind them of the reversal.

[0057] In this embodiment, as Figure 4 As shown, the anti-water warning mechanism also includes a light box, which has at least three different warning lights 17, and an adhesive layer on the back of the light box; the light box also has a buzzer 19.

[0058] The principle is as follows: when motor 4 drives the ball valve core 6 to rotate, closing the channel, one of the indicator lights turns red, alerting people to backflow. After the property management and maintenance personnel have completed repairs to the building's main water pipe and the sewage flow is normal, if the level sensor 10 does not detect the sewage level, motor 4 rotates forward, driving the ball valve core 6 to rotate, and another indicator light 17 turns green. A third indicator light 17 turns yellow, indicating a fault alarm. When backflow occurs, buzzer 19 will sound an alarm to alert people.

[0059] In this embodiment, as Figures 1-2 As shown, a reserve battery 18 is provided on the outside of the controller 3. The reserve battery 18 is electrically connected to the controller 3, the motor 4, the backflow detection mechanism, the self-cleaning mechanism, and the backflow reminder mechanism.

[0060] The principle is that the reserve battery 18 can provide power to the device, ensuring its normal operation when people go out and turn off the power or when there is an unexpected power outage at home.

[0061] A method for using a sewer backflow prevention system includes:

[0062] S1: The sewer waterproofing system is installed vertically between the drain outlet and the drain pipe. During operation, the liquid level sensor 10 collects the liquid level information of the sewage. If the liquid level sensor 10 senses the liquid level, it means that the sewage has backflowed to the connecting pipe 5. Then the liquid level sensor 10 transmits the signal to the controller 3. The controller 3 controls the motor 4 to start and rotates the ball valve core 6 to close the channel, preventing backflow from overflowing into the room and causing indoor environmental pollution.

[0063] S2: At the same time, the controller 3 will send a backflow warning signal to people through the backflow reminder mechanism to notify people that there is a backflow in the sewer. Then people will notify the property management or maintenance personnel to repair the main water pipe of the building.

[0064] The water spill warning mechanism includes an IoT module 15 and a light box. The IoT module 15 remotely sends a message to people's mobile phones or computer terminals to remind them of the water spill. The light box is affixed to a conspicuous position on the wall of the house, and a warning light 17 reminds people of the water spill.

[0065] S3: After the property management and maintenance personnel have completed the repair of the building's main water pipe, the sewage discharge is normal, the liquid level drops, and when the liquid level sensor 10 does not detect the liquid level, it means that the sewage has been discharged. Then the liquid level sensor 10 transmits the signal to the controller 3, and the controller 3 controls the motor 4 to start, rotates the ball valve core 6 to open the channel, so that the device is in normal working condition.

[0066] During the operation of the channel, sewage foam may accumulate in the connecting pipe 5. Therefore, the controller 3 will periodically control the water pump to supply water to the water supply pipe 13 and provide a certain pressure to the water flow, so that the water flow has a certain force to rush into the interior of the connecting pipe 5 from the flushing port, thereby flushing away the accumulated sewage foam. At the same time, the controller 3 will turn off the liquid level sensor 10 when the water pump is working to prevent false sensing and causing the channel to close. The duration of the water pump being open is preset in the controller 3. When the water pump is turned off, the controller 3 will turn the liquid level sensor 10 back on, and the device will work normally.

[0067] Example 2:

[0068] Unlike the embodiments described above, in this embodiment, as... Figures 1-5 As shown, a base 21 is provided on the outer surface of the lower tube 2, and a motor support 22 is fixedly connected to the base 21. The motor 4 is installed on the motor support 22, the controller 3 is installed inside the base 21, and the storage battery is installed below the motor support 22. The above arrangement integrates the installation positions of various mechanisms in the device, reduces the size of the device, and facilitates the installation of the device.

[0069] The motor 4, controller 3, transmission mechanism, and reserve battery 18 are all protected by a housing 20.

[0070] Example 3:

[0071] Unlike the above embodiments, in this embodiment, the housing 20 is made of transparent material, which makes it easy to see the working status of the controller 3 and other mechanisms.

[0072] Example 4:

[0073] Unlike the above embodiments, in this embodiment, the controller 3 can also be an STM32 microcontroller, thereby reducing the size of the entire device.

[0074] Example 5:

[0075] Unlike the above embodiments, in this embodiment, the top end of the upper tube 1 and the bottom end of the lower tube 2 are provided with a flexible joint, which facilitates the installation and removal of the device and makes maintenance easier.

[0076] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A sewer backflow prevention system, characterized in that: The sewer waterproofing system is vertically installed between the drain outlet and the drain pipe, including an upper pipe (1) and a lower pipe (2) that are interconnected and connected, and a controller (3). A shut-off valve mechanism is provided between the upper pipe (1) and the lower pipe (2). The shut-off valve mechanism is driven by a motor (4). The motor (4) is electrically connected to the controller (3). A backflow detection mechanism and a self-cleaning mechanism are provided between the lower pipe (2) and the shut-off valve mechanism. The backflow detection mechanism and the self-cleaning mechanism are electrically connected to the controller (3) respectively. A backflow reminder mechanism is also connected to the outside of the controller (3). The shut-off valve mechanism includes a connecting pipe (5) and a ball valve core (6). The top end of the connecting pipe (5) is sealed to the bottom end of the upper pipe (1). The ball valve core (6) is installed inside the connection between the connecting pipe (5) and the upper pipe (1). The ball valve core (6) is rotatably connected to the upper pipe (1) and the connecting pipe (5). The ball valve core (6) is driven by the motor (4). The motor (4) is fixedly connected to the connecting pipe (5) or the upper pipe (1). The backflow detection mechanism includes a liquid level sensor (10) installed on the connecting pipe (5), the liquid level sensor (10) is electrically connected to the controller (3), and the sensing head of the liquid level sensor (10) is installed inside the connecting pipe (5); The self-cleaning mechanism includes a flushing port (11) disposed inside the connecting pipe (5). The flushing port (11) is inclined downward. The connecting pipe (5) is also provided with a mounting base (12) communicating with the flushing port (11). The mounting base (12) is connected to an external water supply pipe (13). The water supply pipe (13) controls the water supply through a water pump. The water pump is electrically connected to the controller (3). The flushing port (11) is located near the sensing head of the liquid level sensor (10). The connecting pipe (5) is also provided with a funnel-shaped inner pipe (14). The top edge of the funnel-shaped inner pipe (14) is fixedly connected to the connecting pipe (5). The bottom end of the funnel-shaped inner pipe (14) extends to the bottom of the backflow detection mechanism and the self-cleaning mechanism. During normal operation, sewage enters the upper pipe (1) from the drain outlet and reaches the connecting pipe (5). By setting the funnel-shaped inner pipe (14), the sewage flowing normally will not be misjudged by the liquid level sensor (10). The motor (4) is located outside the lower tube (2) and is fixedly connected to the lower tube (2). A transmission mechanism is provided between the motor (4) and the ball valve core (6). The transmission mechanism includes a worm (8). One end of the worm (8) is fixedly connected to the output shaft of the motor (4), and the other end of the worm (8) is rotatably connected to the support plate (9) fixed outside the upper tube (1). A worm wheel (7) that cooperates with the worm (8) is provided on one side of the ball valve core (6).

2. The sewer backflow prevention system according to claim 1, characterized in that: The anti-water reminder mechanism includes an Internet of Things (IoT) module (15) electrically connected to the controller (3), and the IoT module (15) is connected to an existing terminal.

3. A sewer backflow prevention system according to claim 1, characterized in that: The anti-water warning mechanism also includes a light box, on which at least three different warning lights (17) are provided.

4. A sewer backflow prevention system according to claim 1, characterized in that: The controller (3) is provided with a storage battery (18) on its outside. The storage battery (18) is electrically connected to the controller (3), the motor (4), the backflow detection mechanism, the self-cleaning mechanism and the backflow reminder mechanism respectively.

5. A method for preventing backflow in sewers, utilizing a sewer backflow prevention system according to any one of claims 1 to 4, characterized in that, include: S1: The sewer waterproofing system is installed vertically between the drain outlet and the drain pipe. When working, the liquid level sensor (10) collects the liquid level information of the sewage. If the liquid level sensor (10) senses the liquid level, it transmits the signal to the controller (3). The controller (3) controls the motor (4) to start and rotates the ball valve core (6) to close the channel, preventing backflow of water into the room and causing indoor environmental pollution. S2: The controller (3) will send a backflow signal to people through the backflow reminder mechanism to notify people that there is a backflow in the sewer. Then people will notify the property management or maintenance personnel to repair the main water pipe of the building. S3: When the fault is cleared and the sewage discharge is normal, the liquid level drops. Then, when the liquid level sensor (10) does not detect the liquid level, it means that the sewage has been discharged. Then the liquid level sensor (10) transmits the signal to the controller (3), and the controller (3) controls the motor (4) to start and rotates the ball valve core (6) to open the channel, so that the device is in normal use. During use, sewage foam may accumulate in the connecting pipe (5), causing the level sensor (10) to misjudge. The controller (3) controls the water pump to supply water to the water supply pipe (13) at regular intervals and provides a certain pressure to the water flow, so that the water flow has a certain force to rush into the interior of the connecting pipe (5) from the flushing port (11), thereby flushing away the sewage foam accumulated in the connecting pipe (5) and the surrounding area. At the same time, the controller (3) will turn off the level sensor (10) when the water pump is working to prevent false sensing and channel closure. The duration of the water pump being turned on is preset in the controller (3). When the water pump is turned off, the controller (3) will turn on the level sensor (10) again, and the device will work normally.

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