Intelligent monitoring device for urban sewer network

Abstract

This invention relates to the field of monitoring, and more particularly to an intelligent monitoring device for urban drainage pipe networks. The technical problems to be solved are: existing urban drainage pipe network monitoring devices are prone to damage from impurities, are affected by high-speed water flow, suffer from silt adsorption leading to decreased accuracy, and lack self-testing and cross-verification functions. The technical implementation of this invention is as follows: an intelligent monitoring device for urban drainage pipe networks includes a manhole and drainage pipes; drainage pipes for sewage discharge are installed on both sides of the manhole; this invention effectively protects the probes from impurities by setting three sets of V-shaped filters (upper, middle, and lower) on the left side of the mounting frame to filter water flow at different depths in stages, intercepting large particles of impurities and preventing them from directly impacting the probes of the upper, middle, and lower temperature detectors, significantly reducing the risk of probe damage and extending the service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of monitoring, and more particularly to an intelligent monitoring device for urban drainage pipe networks. Background Technology

[0002] Urban drainage networks are a crucial component of urban water systems, and real-time monitoring of their operational status is essential for flood control, pollution control, and network maintenance. Currently, a common monitoring method involves installing temperature detectors inside inspection wells. By detecting changes in sewage temperature at different depths, the operational status of the network (such as infiltration of external water or illegal discharge) can be indirectly determined.

[0003] Chinese patent (Drainage Pipeline Temperature Monitoring Device) with publication number CN223259093U proposes to monitor the temperature of sewage in inspection wells. During the detection process, it raises the issue of the impact of water flow and flow rate on the monitoring. However, the above-mentioned drainage network temperature monitoring device has the following drawbacks in practical applications: (1) Sensors are susceptible to damage from impurities: Wastewater often contains large particles (such as sand, gravel, debris, etc.). When these impurities move at high speed with the water flow, they will directly impact the probe of the temperature detector, causing damage to the probe surface, reduced accuracy, or even complete failure.

[0004] (2) Sludge accumulation affects monitoring accuracy: Sludge and other fine particles carried in sewage are easily adsorbed on the surface of the temperature detector probe, forming a heat insulation layer or a pollution layer, which leads to sluggish sensor response and measurement data that deviates significantly from the true value.

[0005] (3) Lack of self-testing and cross-verification functions: Existing devices usually only have a single temperature sensor, which cannot perform accuracy self-testing and cross-verification of sensors at the same or multiple water depths. When a sensor drifts or malfunctions, it is difficult to detect it in time. Summary of the Invention

[0006] In order to overcome the shortcomings of existing urban drainage network monitoring devices, such as temperature detectors being easily damaged by impurities, being affected by high-speed water flow, having reduced accuracy due to silt adsorption, and lacking self-testing and mutual verification functions, this invention provides an intelligent monitoring device for urban drainage networks.

[0007] The technical solution is as follows: an intelligent monitoring device for urban drainage pipe networks, comprising an inspection well and a drainage pipe; drainage pipes for sewage discharge are installed on both sides of the inspection well; it also includes an installation frame, a fixing frame, V-shaped filters, a slow-flow settling frame, an upper temperature detector, a middle temperature detector, and a lower temperature detector; a rotatable installation frame is installed inside the inspection well; a fixing frame is installed on the installation frame, and the fixing frame is located on the water flow path between the inspection well and the drainage pipe; three V-shaped filters for filtering large impurities are arranged equidistantly from top to bottom on the fixing frame; the fixing frame has a hollow internal structure, and a slow-flow settling frame with the same number of V-shaped filters is installed inside, with the V-shaped filters installed synchronously on the left side of the slow-flow settling frame; an upper temperature detector, a middle temperature detector, and a lower temperature detector are installed sequentially on the upper, middle, and lower slow-flow settling frames, and the water temperature at different depths is monitored through the above detectors.

[0008] Furthermore, it also includes lead screws; three lead screws are screwed onto the fixing frame; each lead screw is movably connected to the adjacent upper temperature detector, middle temperature detector and lower temperature detector; a sealed space is provided at the top of the fixing frame, and three miniature waterproof motors are provided in the sealed space to drive the corresponding lead screws to rotate.

[0009] Furthermore, the left side of the mounting bracket is designed in a V-shape.

[0010] Furthermore, a V-shaped depression is provided in the middle of the slow-flow settling frame.

[0011] Furthermore, a channel is provided at the V-shaped depression of the slow-flow settling frame for drainage.

[0012] Furthermore, the upper temperature detector is located in front of the uppermost slow-flow settling frame, the middle temperature detector is located in the middle of the middle slow-flow settling frame, and the lower temperature detector is located behind the lowermost slow-flow settling frame.

[0013] Furthermore, the uppermost slow-flow settling frame is equipped with a rear upper inspection port and a middle upper inspection port, the middle slow-flow settling frame is equipped with a middle rear inspection port and a middle front inspection port, and the lowermost slow-flow settling frame is equipped with a lower middle inspection port and a lower front inspection port.

[0014] Furthermore, a guide plate is provided inside the fixing frame, and the right side of the guide plate is inclined downwards.

[0015] Furthermore, the upper, middle, and lower temperature detectors are staggered and set on the same vertical line.

[0016] Furthermore, it also includes a slide rail, sliders, and elastic elements; a slide rail is installed inside the inspection well; two sliders are symmetrically slidably connected on the slide rail; an elastic element, which is a spring, is fixedly connected to the left and right sides of the two sliders respectively.

[0017] The beneficial effects are as follows: This invention effectively protects the probe from the impact of impurities: By setting three sets of V-shaped filters (upper, middle, and lower) on the left side of the fixed frame, the water flow at different depths is filtered in stages to intercept large particles of impurities and prevent them from directly impacting the probes of the upper, middle, and lower temperature detectors, which significantly reduces the risk of probe damage and extends the service life of the equipment. Settling sludge and reducing probe contamination: The slow-flow settling frame is equipped with a V-shaped depression and a channel in the middle. The principle of gravity settling is used to allow fine particles such as sludge in the slow-flowing sewage to be deposited in the V-shaped depression and discharged outward through the channel. With the help of the inclined guide plate, the adsorption of sludge on the probe surface is effectively reduced, and the long-term accuracy of temperature detection is improved. Achieve multi-probe self-testing and accuracy cross-verification: Drive the upper, middle and lower temperature detectors vertically by the lead screw and miniature waterproof motor. Each detector can be moved to the corresponding detection port position of other detectors. The temperature data at different water depths can be cross-compared, thereby completing the system self-test without manual intervention, timely detecting accuracy deviations, and ensuring the reliability of monitoring data. Automatic removal of debris from the filter screen: The fixed frame is movably connected to the inspection well via a slide rail, slider, and elastic element. The impact force of the water flow itself causes the angle between the fixed frame and the water flow direction to change irregularly, thereby changing the scouring angle of the water flow on the V-shaped filter screen. This effectively removes sheet-like debris such as plastic and fiber covering the filter screen surface, prevents filter screen blockage, and ensures smooth water flow and continuous monitoring. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the intelligent monitoring device for urban drainage pipe networks according to the present invention; Figure 2 This is a first cross-sectional view of the intelligent monitoring device for urban drainage pipe networks of the present invention; Figure 3 This is a three-dimensional structural diagram of the slide rail, slider, and elastic element combination of the present invention; Figure 4 This is a three-dimensional structural diagram of the combination of the fixing frame and the V-shaped filter screen of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the V-shaped filter and the slow-flow settling frame combination of the present invention; Figure 6 This is a cross-sectional view of the slow-flow settling frame of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the slow-flow settling frame of the present invention; Figure 8 This is a three-dimensional structural diagram of the temperature detector and lead screw assembly of the present invention.

[0019] Component names and serial numbers in the diagram: 1-Inspection well, 2-Drainage pipe, 101-Mounting bracket, 102-Fixing bracket, 10201-Guide plate, 103-V-type filter screen, 104-Slow flow settling frame, 10401-Rear upper inspection port, 10402-Middle upper inspection port, 10403-Middle rear inspection port, 10404-Middle front inspection port, 10405-Lower middle inspection port, 10406-Lower front inspection port, 105-Upper temperature detector, 106-Middle temperature detector, 107-Lower temperature detector, 108-Screw, 201-Slide rail, 202-Slider, 203-Elastic element. Detailed Implementation

[0020] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1

[0022] A smart monitoring device for urban drainage pipe networks, such as Figures 1-8 As shown, it includes a manhole 1 and a drain pipe 2; drain pipes 2 are installed on both sides of the manhole 1; It also includes a mounting frame 101, a fixing frame 102, a V-shaped filter screen 103, a slow-flow settling frame 104, an upper temperature detector 105, a middle temperature detector 106, and a lower temperature detector 107; the mounting frame 101 is installed inside the inspection well 1; the fixing frame 102 is installed on the mounting frame 101; three V-shaped filters 103 are arranged equidistantly from top to bottom on the left side of the fixing frame 102; the fixing frame 102 has a hollow internal structure and is equipped with a number of slow-flow settling frames 104 equal to the number of V-shaped filters 103, and the V-shaped filters 103 are installed synchronously on the left side of the slow-flow settling frame 104; the upper temperature detector 105, the middle temperature detector 106, and the lower temperature detector 107 are installed sequentially on the upper, middle, and lower slow-flow settling frames 104.

[0023] It also includes lead screws 108; three lead screws 108 are screwed onto the fixing frame 102; each lead screw 108 is movably connected to the adjacent upper temperature detector 105, middle temperature detector 106 and lower temperature detector 107 respectively; a sealed space is provided at the top of the fixing frame 102, and three miniature waterproof motors are provided in the sealed space to drive the corresponding lead screws 108 to rotate. The design of the top sealed space not only protects the motors from the effects of moisture, corrosive gases and sewage splashes in the inspection well 1, but also significantly improves the long-term operational reliability of the drive system. At the same time, it is also convenient for maintenance personnel to inspect or replace the motors without disassembling the fixing frame 102, reducing the difficulty of maintenance.

[0024] The left side of the mounting bracket 102 is V-shaped. This V-shaped structure not only reduces the direct impact force of the water flow, but also naturally guides the flow from different directions to converge in the central area of ​​the three V-shaped filter screens 103, improving the effective interception area utilization rate of the filter screens. At the same time, the V-shaped surface can reduce the intensity of eddies and turbulence formed on the left side of the mounting bracket 102, making the water flow into the slow-flow settling frame 104 more stable, and further reducing the probe measurement noise caused by turbulence.

[0025] The slow-flow settling frame 104 has a V-shaped depression in the middle.

[0026] The 104V type slow-flow settling frame has a channel in the recessed area for drainage.

[0027] The upper temperature detector 105 is located in front of the uppermost slow-flow settling frame 104, the middle temperature detector 106 is located in the middle of the middle slow-flow settling frame 104, and the lower temperature detector 107 is located behind the lowermost slow-flow settling frame 104. This staggered arrangement of the front, middle, and rear detectors not only avoids mutual obstruction or thermal interference between the three sets of temperature detectors in the vertical direction, but also allows each detector to correspond to the water body in different flow sections within the slow-flow settling frame 104, achieving multi-point sampling at the same water depth. When a local temperature anomaly occurs near a detection port (such as a small influx of external water), the staggered arrangement helps to quickly locate the source of the anomaly, improving the spatial resolution of fault diagnosis.

[0028] The uppermost slow-flow settling frame 104 has a rear upper detection port 10401 and a middle upper detection port 10402; the middle slow-flow settling frame 104 has a middle rear detection port 10403 and a middle front detection port 10404; and the lowermost slow-flow settling frame 104 has a lower middle detection port 10405 and a lower front detection port 10406. The arrangement of these multiple detection ports provides the device with a variety of cross-sampling positions. Combined with the detector movement function driven by the lead screw 108, any temperature detector can be moved to multiple detection ports corresponding to two other detectors for comparative measurement, forming a three-point mutual verification network. Compared to simple pairwise comparisons, three-point mutual verification can more sensitively identify the drift or failure of a single detector and can automatically determine abnormal probes through majority voting logic, significantly improving the reliability and credibility of the system's self-test.

[0029] The fixing frame 102 is provided with a guide plate 10201 inside, and the right side of the guide plate 10201 is inclined downward.

[0030] The upper temperature detector 105, the middle temperature detector 106, and the lower temperature detector 107 are staggered and set on the same vertical line to ensure that the water temperature at different water levels on the same vertical line can be monitored and compared, thereby improving the monitoring accuracy.

[0031] When monitoring the temperature of sewage in inspection well 1, the water flows in the direction shown in the diagram (usually from left to right). When the sewage flows through the V-shaped filter 103 installed on the left side of the fixed frame 102, the upper, middle, and lower sets of V-shaped filters 103, corresponding to different water depths, perform preliminary filtration of the sewage entering the corresponding slow-flow settling frame 104, intercepting large particles and suspended solids to prevent them from entering the fixed frame 102. This avoids physical impact or damage to the probes of the subsequent upper temperature detector 105, middle temperature detector 106, and lower temperature detector 107. In addition, the graded setting of the upper, middle, and lower sets of filters can adapt to the common water stratification phenomenon in urban drainage networks: surface water often contains floating fibers, middle water has more suspended solids, and bottom water carries heavy particles such as sand and gravel. The filters at different water depths intercept the main types of impurities in their respective water layers, avoiding the excessively rapid clogging of a single filter due to all types of impurities, and extending the effective working time of the filter.

[0032] After being filtered by the V-shaped filter 103, the wastewater then enters the corresponding slow-flow settling frame 104. This settling frame 104 features a gradually expanding structure, narrower on the left and wider on the right, effectively slowing the incoming wastewater and creating a slow-flow state. This slow-flow design significantly reduces the wastewater flow velocity, preventing excessive impact on the probes of the upper temperature detector 105, middle temperature detector 106, and lower temperature detector 107 due to excessive flow velocity, thus preventing probe damage or measurement instability caused by vibration. Furthermore, the slow-flow state also brings a hidden advantage: as the water flow velocity decreases, the heat exchange between the probe surface and the water body tends to stabilize, and the dynamic response of the temperature measurement is closer to the actual water temperature. This avoids the problem of measurement fluctuations or underestimation caused by the thinning of the thermal boundary layer due to high-speed water flow, improving data repeatability.

[0033] In a slow-flow state, the wastewater further flows through the V-shaped depression in the middle of the slow-flow settling frame 104. This structure utilizes the principle of gravity settling, allowing the fine sludge, suspended particles, and other impurities remaining in the slow-flowing wastewater to settle naturally within the V-shaped depression area. It is worth noting that this V-shaped depression, together with the gradually expanding slow-flow section, forms a miniature sedimentation tank, which not only settles sludge but also effectively captures fine sand particles with a specific gravity greater than water. If these sand particles directly impact the probe surface, they will form tiny scratches on the glass or metal casing. Long-term accumulation can lead to a decrease in probe transmittance (for optical temperature sensing principles) or an increase in surface roughness, resulting in the adsorption of more contaminants. The miniature sedimentation effect of this device significantly reduces the risk of probe surface abrasion, further extending the lifespan of the core sensor. The relatively clean wastewater, after settling, continues to flow forward, eventually contacting the probes of the upper temperature detector 105, middle temperature detector 106, and lower temperature detector 107 installed on the slow-flow settling frame 104, achieving accurate monitoring of wastewater temperature at different depths.

[0034] The sludge and wastewater containing impurities that settle in the V-shaped depression are discharged outwards through a channel provided in this depression. During the discharge process, under the guidance of the inclined guide plate 10201, impurities are smoothly discharged to the outside of the fixed frame 102, preventing them from accumulating inside the fixed frame 102, thereby preventing equipment corrosion and maintenance difficulties caused by sludge accumulation. The downward tilt of the right side of the guide plate 10201 matches the discharge direction of the channel, allowing the sludge-containing wastewater flowing out of the channel to flow directly along the guide plate 10201 to the bottom right side of the fixed frame 102 and be discharged with the main flow, effectively preventing secondary deposition of sludge in the bottom corner of the fixed frame 102. This gravity-driven automatic sludge discharge path requires no additional energy input, achieving low-power long-term self-cleaning.

[0035] In addition, to verify the accuracy of the upper temperature detector 105, the middle temperature detector 106, and the lower temperature detector 107, this device is also designed with self-testing and mutual testing functions. The following explanation uses the middle temperature detector 106 as an example: When it is necessary to verify the measurement accuracy of the upper temperature detector 105 or the lower temperature detector 107, the corresponding miniature waterproof motor drives the lead screw 108 to rotate, causing the middle temperature detector 106 to move vertically. Specifically, it is moved to the upper-middle detection port 10402 or the lower-middle detection port 10405 on the slow-flow settling frame 104, respectively, to independently detect the sewage temperature at that depth. The obtained data is compared and analyzed with the data measured by the upper temperature detector 105 or the lower temperature detector 107 at the same time and depth. If the data deviation is within the allowable range, each detector is considered to be working normally; if the deviation exceeds the threshold, the detector with accuracy drift can be identified.

[0036] In this process, the use of the lead screw 108 to drive the movement of the detector also provides an additional advantage: as the temperature detector's probe moves from its initial position to different detection ports, a slight mechanical scraping occurs between the probe surface and the edge of the detection port (where a soft, flexible silicone material is installed). This scraping effectively removes any trace amounts of dirt or biofilm that have formed on the probe surface, achieving physical self-cleaning of the probe. Compared to relying solely on water flushing, this active, mobile cleaning method can specifically remove firmly attached contaminants, further ensuring long-term monitoring accuracy. Furthermore, since the upper, middle, and lower detectors can move independently and sequentially stop at multiple detection port positions, this device can acquire continuous temperature profile data along the same vertical line (e.g., recording a temperature value every 1 centimeter of movement), rather than just the water temperature at three discrete points. This continuous profile capability is of great significance for identifying subtle hydrological phenomena such as thin-layer infiltration of external water and thermal stratification interfaces.

[0037] This process requires no manual intervention and enables the device to perform self-testing and cross-validation, effectively ensuring the accuracy and reliability of long-term monitoring data.

[0038] Example 2

[0039] Based on Example 1, such as Figure 2 and Figure 3 As shown, it also includes a slide rail 201, a slider 202 and an elastic element 203; the slide rail 201 is installed inside the inspection well 1; two sliders 202 are symmetrically slidably connected on the slide rail 201; an elastic element 203 is fixedly connected to the left and right sides of the two sliders 202 respectively, and the elastic element 203 is a spring.

[0040] In actual operation, sewage often contains sheet-like or flexible waste such as plastics and fibers, which can easily adhere to and cover the surface of the V-shaped filter screen 103, causing the filter screen to become clogged, affecting the normal passage of sewage, and consequently causing lag or failure of temperature detection.

[0041] In actual operation, sewage often contains sheet-like or flexible waste such as plastics and fibers, which can easily adhere to and cover the surface of the V-shaped filter screen 103, causing the filter screen to become clogged, affecting the normal passage of sewage, and consequently causing lag or failure of temperature detection.

[0042] Therefore, in this device, the fixed frame 102 is slidably connected to the slide rail 201 installed in the inspection well 1 via the slider 202, and an elastic element 203 is provided between the two sliders 202. When water flows through the fixed frame 102, the flow velocity and impact direction of the water flow at different times and different water depths are random. This impact force causes the fixed frame 102 to drive the slider 202 to produce irregular small-amplitude swings or rotations within the slide rail 201, thereby changing the relative angle between the fixed frame 102 and the V-shaped filter screen 103 and the water flow direction.

[0043] When the surface of the V-shaped filter screen 103 is covered with debris, the direction of the water flow on the filter screen changes accordingly with the change of angle. The plastic or fiber debris that was not firmly attached is washed away from the surface of the filter screen by the lateral impact of the water flow, thus achieving automatic removal. The elastic element 203 plays a limiting and resetting role in this process, preventing the fixed frame 102 from swinging too much and avoiding affecting the normal working posture of the upper temperature detector 105, the middle temperature detector 106, and the lower temperature detector 107.

[0044] In addition to removing debris from the filter screen surface, the irregular oscillation of the fixed frame 102 also transmits to the internal slow-flow settling frame 104, causing slight shaking of the silt deposited in the V-shaped depression. This low-frequency micro-vibration helps to break the silt's tendency to clump, making it easier for the sediment to slide along the V-shaped slope into the channel and be discharged smoothly, thus improving sludge removal efficiency. Simultaneously, the flexible connection system composed of the elastic element 203 and the slider 202 is equivalent to introducing a mechanical low-pass filter between the fixed frame 102 and the inspection well 1. This absorbs and buffers sudden, large-amplitude impacts (such as instantaneous surges) in the water flow, preventing rigid impacts from being directly transmitted to the temperature sensor probe and the screw 108 drive mechanism, significantly improving the device's survivability under extreme hydraulic conditions. After the impact, the restoring force of the elastic element 203 causes the fixed frame 102 to automatically return to its equilibrium position, ensuring that the three temperature sensors remain approximately near the preset water depth during long-term monitoring, without the need for manual resetting.

[0045] Through the above structure, this device utilizes the energy of the water flow itself to achieve periodic self-cleaning of the filter screen, effectively preventing filter screen blockage and ensuring the continuity and stability of monitoring work.

[0046] It should be understood that the above description is for illustrative purposes only and is not intended to limit the invention. Those skilled in the art will understand that variations of the invention are included within the scope of the claims herein.

Claims

1. An intelligent monitoring device for urban drainage pipe networks, comprising a manhole (1) and drainage pipes (2); drainage pipes (2) for sewage discharge are installed on both sides of the manhole (1); characterized in that, It also includes a mounting frame (101), a fixing frame (102), a V-shaped filter screen (103), a slow-flow settling frame (104), an upper temperature detector (105), a middle temperature detector (106), and a lower temperature detector (107); a rotatable mounting frame (101) is installed inside the inspection well (1); a fixing frame (102) is provided on the mounting frame (101), and the fixing frame (102) is located on the water flow path between the inspection well (1) and the drain pipe (2); the fixing frame (102) is equidistant from top to bottom. Three V-shaped filter screens (103) are arranged to filter large impurities; the fixed frame (102) has a hollow structure inside, and the same number of slow-flow settling frames (104) are set inside, and the V-shaped filter screens (103) are installed on the left side of the slow-flow settling frames (104); the upper, middle and lower slow-flow settling frames (104) are equipped with an upper temperature detector (105), a middle temperature detector (106) and a lower temperature detector (107) in sequence, and the water temperature at different depths is monitored by the above detectors.

2. The intelligent monitoring device for urban drainage pipe networks according to claim 1, characterized in that, It also includes lead screws (108); three lead screws (108) are screwed onto the fixing frame (102); each lead screw (108) is movably connected to the adjacent upper temperature detector (105), middle temperature detector (106) and lower temperature detector (107); a sealed space is provided on the top of the fixing frame (102), and three miniature waterproof motors are provided in the sealed space to drive the corresponding lead screws (108) to rotate.

3. The intelligent monitoring device for urban drainage pipe networks according to claim 1, characterized in that, The left side of the fixing bracket (102) is set in a V shape.

4. The intelligent monitoring device for urban drainage pipe networks according to claim 1, characterized in that, The slow-flow settling frame (104) has a V-shaped depression in the middle.

5. The intelligent monitoring device for urban drainage pipe networks according to claim 2, characterized in that, The V-shaped depression of the slow-flow settling frame (104) is provided with a through groove for drainage.

6. The intelligent monitoring device for urban drainage pipe networks according to claim 5, characterized in that, The upper temperature detector (105) is located in front of the uppermost slow-flow settling frame (104), the middle temperature detector (106) is located in the middle of the middle slow-flow settling frame (104), and the lower temperature detector (107) is located behind the lowermost slow-flow settling frame (104).

7. The intelligent monitoring device for urban drainage pipe networks according to claim 2, characterized in that, The uppermost slow-flow settling frame (104) is provided with a rear upper inspection port (10401) and a middle upper inspection port (10402), the middle slow-flow settling frame (104) is provided with a middle rear inspection port (10403) and a middle front inspection port (10404), and the lowermost slow-flow settling frame (104) is provided with a lower middle inspection port (10405) and a lower front inspection port (10406).

8. The intelligent monitoring device for urban drainage pipe networks according to claim 1, characterized in that, The fixing frame (102) is provided with a guide plate (10201) inside, and the right side of the guide plate (10201) is inclined downward.

9. The intelligent monitoring device for urban drainage pipe networks according to claim 1, characterized in that, The upper temperature detector (105), the middle temperature detector (106), and the lower temperature detector (107) are staggered and set on the same vertical line.

10. The intelligent monitoring device for urban drainage pipe networks according to claim 1, characterized in that, It also includes a slide rail (201), a slider (202) and an elastic element (203); the slide rail (201) is installed inside the inspection well (1); two sliders (202) are symmetrically slidably connected on the slide rail (201); an elastic element (203) is fixedly connected to the left and right sides of the two sliders (202).

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