A preliminary rainwater intercepting well with a cleaning structure

Abstract

This invention discloses an initial rainwater interception well with a cleaning structure and an initial rainwater interception control method. The rainwater interception well includes: a well body forming a cavity, the cavity comprising a water distribution well and a power well separated from each other, the cavity being connected to a clean rainwater outlet pipe; the cavity also includes a sewage interception control well, the outlet end of a sewage interception orifice extending to the sewage interception control well, the sewage interception control well being connected to the initial rainwater outlet pipe, and the bottom of the power well being connected to the sewage interception control well via a drain pipe; a liquid level sensing structure disposed within the power well and drivenly connected to an opening control structure; and a cleaning structure movable within the drain pipe. This invention eliminates the need for electrically controlled valves or gates, requires no external power, has wide applicability, is low-carbon and energy-saving, has low construction costs, is easy to maintain, and the cleaning structure can move within the drain pipe to clean the inner wall of the drain pipe, preventing blockage of the drain pipe and affecting drainage from the power well.

Description

Technical Field

[0001] This invention relates to the field of rainwater harvesting and separation technology, and in particular to an initial rainwater interception well with a cleaning structure. Background Technology

[0002] Rainwater containing surface pollutants at the initial stage of rainfall is called initial runoff. This portion of rainwater is highly polluted and requires purification treatment. During the middle and later stages of rainfall, because the surface has already been washed away by the initial runoff, the surface pollutant content in the runoff is low. This period of rainwater is called clean rainwater and can be directly discharged into water bodies. There is a correlation between the concentration of pollutants in surface runoff rainwater and the duration of rainfall; the concentration of pollutants in rainwater gradually decreases as continuous rainfall washes away surface pollutants. In engineering practice, rainfall duration is often used to distinguish between initial runoff and clean rainwater.

[0003] In the initial stages of rainfall, surface pollutants are discharged into municipal stormwater pipes with rainwater. If not intercepted and purified, these pollutants can cause serious pollution to rivers and lakes around the city. The new version of the "Outdoor Drainage Design Standard" (GB50014-2021) stipulates that urban wastewater treatment plants should reserve capacity for purifying initial rainfall. Intercepting initial rainwater (including non-point source pollutants) from the municipal stormwater pipe network, connecting it to the municipal sewage pipe network, and ultimately treating it in urban wastewater treatment plants will become the mainstream technical route for the comprehensive treatment of non-point source pollutants. Initial rainwater interception wells with cleaning structures are an important part of non-point source pollutant treatment.

[0004] Currently, initial rainwater interception wells with cleaning structures can be divided into two categories: traditional extensive interception wells and intelligent interception wells. Traditional extensive interception wells borrow the concept of intercepting sewage at the end of urban combined sewer systems, using recessed channels or weirs to intercept initial rainwater into the sewage pipe. However, clean rainwater in the later stages of rainfall is uncontrolled, resulting in a large amount of clean rainwater entering the sewage pipe, reducing the COD concentration of sewage, which is detrimental to the stable operation and maintenance of urban sewage treatment plants, and may even lead to excessive effluent standards. Intelligent interception wells require online water quality monitoring instruments such as COD, conductivity, and turbidity meters. Simultaneously, electrically controlled valves or gates are installed on the initial rainwater outlet pipe and the clean rainwater outlet pipe. The water quality monitoring instruments distinguish between initial rainwater and clean rainwater, triggering the opening and closing of the electrically controlled valves, thereby achieving the goal of initial rainwater entering the sewage pipe network and clean rainwater being discharged into urban water bodies. However, intelligent initial rainwater interception wells with cleaning structures often occupy a large area, have complex control systems, poor stability, high costs, and are troublesome to manage and maintain. In addition, the bottom of the power well is connected to the sewage interception and control well through a drain pipe, and the drain pipe is blocked, which affects the drainage of the power well. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an initial rainwater interception well with a cleaning structure, which can control the flow of initial rainwater and clean rainwater in different stages without the need for electronic control equipment.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A rainwater interception well includes: a well body forming a cavity, the cavity including a distribution well and a power well separated from each other, the well wall of the distribution well having a sewage interception hole and an inlet hole communicating with the power well, and an opening control structure for adjusting the opening degree of the sewage interception hole is installed at the sewage interception hole, the cavity being connected to a clean rainwater outlet pipe, and the inlet water level of the rainwater from the distribution well entering the clean rainwater outlet pipe being higher than the inlet hole and the sewage interception hole; a liquid level sensing structure, disposed in the power well and drivenly connected to the opening control structure, the liquid level sensing structure being able to move up and down according to the liquid level height of the power well, and on at least part of the moving path of the liquid level sensing structure, the rising of the liquid level sensing structure can trigger the opening control structure to reduce the opening degree of the sewage interception hole.

[0007] Furthermore, it also includes a flow control gate, which is placed inside the water distribution well and can be raised and lowered to adjust its position to control the opening degree of the water inlet.

[0008] Furthermore, an adjusting chain is connected to the upper end of the flow control gate, and an anchor hook located above the flow control gate is fixed inside the well cavity. Chain links at different positions on the adjusting chain are hung on the anchor hook to achieve height adjustment of the flow control gate.

[0009] Furthermore, the opening control structure is a intercepting hole gate plate placed inside the water distribution well. The water distribution well wall is provided with a lifting ring located above the intercepting hole. The intercepting hole gate plate and the liquid level sensing structure are connected by a transmission chain passing through the lifting ring.

[0010] Furthermore, the bottom of the inlet end of the intercepting hole is higher than the bottom of the inlet end of the water inlet hole.

[0011] Furthermore, the well cavity also includes a clean rainwater well, which is connected to a distribution well. The distribution well is connected to a rainwater inlet pipe, and the inlet end of the clean rainwater outlet pipe extends to the well wall of the clean rainwater well.

[0012] Furthermore, the bottom of the clean rainwater well is separated from the distribution well by a partition wall. The bottom of the clean rainwater well is filled with a filling layer, and the upper surface of the filling layer is flush with the upper end of the partition wall and the bottom of the inlet pipe of the clean rainwater outlet pipe.

[0013] Furthermore, the well cavity also includes a sewage interception control well, the outlet end of the sewage interception hole extends to the sewage interception control well, the sewage interception control well is connected to an initial rainwater outlet pipe, and the bottom of the power well is connected to the sewage interception control well through a drain pipe.

[0014] Furthermore, it also includes a cleaning structure that can move within the drain pipe to clean the inner wall of the drain pipe.

[0015] The present invention also provides a method for controlling initial rainwater interception, comprising the following steps: S1, according to the rainstorm intensity formula of the target area, obtain the rainfall duration t3 corresponding to the initial rainfall h in the target area; S2, based on the water collection time t1 of the farthest water collection facility within the service range of the initial rainwater interception well with the cleaning structure, the transfer time t2 of the rainwater collected by the farthest water collection facility to the initial rainwater interception well with the cleaning structure, and the rainfall duration t3 obtained in step S1, the total water collection time T within the service range of the interception well is obtained. S3, adjust the opening degree of the power well inlet to ensure that when the initial rainfall is h, the time for the power well to be filled with water is T. S4, conduct rainwater testing on the initial rainwater interception well with a cleaning structure, and conduct water quality testing on the rainwater that has just flowed into the clean rainwater outlet pipe; S5. If the water quality exceeds the standard, reduce the opening degree of the water inlet and extend the water filling time of the power well. S6. Repeat steps S4 and S5 until the water quality meets the standards.

[0016] This invention offers the following advantages: It utilizes a liquid level sensing structure to control the vertical movement of the intercepting orifice, enabling the switching between opening and closing, and adjusting the degree of opening and closing. This intercepting well eliminates the need for online water quality monitoring instruments such as COD, conductivity, and turbidity meters, achieving initial rainwater interception. After rainwater is introduced, the liquid level sensing structure gradually rises, and the opening degree of the intercepting orifice gradually decreases until it closes after a period of time. At this point, with the passage of time and continuous washing of the ground by rainwater, the rainwater has become clean rainwater. Due to the closure of the intercepting orifice, the liquid level continues to rise until it is discharged from the clean rainwater outlet pipe, directly flowing into urban water bodies. This achieves phased treatment of initial rainwater and clean rainwater through different flow paths, minimizing initial rainwater pollution to water bodies. Furthermore, it eliminates the need for electrically controlled valves or gates, requires no external power, has wide applicability, is low-carbon and energy-saving, has low construction costs, and is easy to maintain. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a top sectional view of one embodiment of an initial rainwater interception well with a cleaning structure according to the present invention; Figure 2 for Figure 1 AA section view; Figure 3 for Figure 1 A diagram illustrating another state; Figure 4 for Figure 1 Sectional view at BB; Figure 5 for Figure 1 Sectional view at CC; Figure 6 This is a partial structural schematic diagram of another embodiment of an initial rainwater interception well with a cleaning structure according to the present invention; Figure 7 for Figure 6 Sectional view at DD; Figure 8 for Figure 6 A diagram illustrating another state; Figure 9 This is a cross-sectional view of the inside of the drain pipe; Figure 10 for Figure 9 Sectional view at EE; Figure 11 A structural diagram for cleaning the structure.

[0019] Explanation of icon numbers: Well body 100, rainwater inlet pipe 101, clean rainwater outlet pipe 102, initial rainwater outlet pipe 103, water distribution well 110, power well 120, settling trough 121, intercepting and controlling well 130, guide slope 131, water inlet 140, intercepting hole 150, intercepting hole gate 160, clean rainwater well 170, partition wall 171, filling layer 172, drain pipe 180, guide rod 181, connecting part 182, grid baffle 190; Liquid level sensing structure 200, transmission chain 210, lifting ring 220, first connecting chain 230, second connecting chain 240; Flow control gate 300, regulating chain 310; Cleaning structure 400, sliding sleeve 410, scraper 420, sharp corner protrusion 421, series chain 430.

[0020] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0025] Please refer to the appendix. Figures 1 to 4 The present invention provides an initial rainwater interception well with a cleaning structure, including a well body 100 and a liquid level sensing structure 200.

[0026] The well body 100 has a well cavity located underground. A diversion well casing is located at the upper end of the well cavity, with a well opening at the upper end of the casing to facilitate manual access for construction and maintenance. A ladder is also installed on the well wall corresponding to the well opening. A well cover is installed at the well opening to prevent pedestrians and debris from entering the well cavity. Additionally, a fall protection net can be installed at the well opening to prevent pedestrians from falling into the well if the well cover is damaged or removed.

[0027] The well cavity includes a water distribution well 110 and a power well 120 separated from each other. The well wall of the water distribution well 110 is provided with a sewage interception hole 150 and a water inlet hole 140 communicating with the power well 120. The sewage interception hole 150 and the water inlet hole 140 may be provided on opposite side walls of the water distribution well 110. The water inlet hole 140 is provided on a partition wall shared by the water distribution well 110 and the power well 120. The sewage interception hole 150 is equipped with an opening degree adjustment device for adjusting the opening and closing degree of the sewage interception hole 150. The control structure has a well cavity connected to a clean rainwater outlet pipe 102. The rainwater in the distribution well 110 enters the clean rainwater outlet pipe 102 at a level higher than the inlet hole 140 and the intercepting hole 150, so that the rainwater flowing into the clean rainwater outlet pipe 102 has the lowest priority. The rainwater that initially enters the distribution well 110 will preferentially enter the intercepting hole 150 and the inlet hole 140, thereby preventing the rainwater with a high degree of initial pollution from being discharged from the clean rainwater outlet pipe 102.

[0028] A liquid level sensing structure 200 is disposed within the power well 120. The liquid level sensing structure 200 is connected to the opening control structure. The liquid level sensing structure 200 can rise and fall in accordance with changes in the liquid level height of the power well 120. Furthermore, on at least a portion of the rising and falling path of the liquid level sensing structure 200, the rising of the liquid level sensing structure 200 can trigger the opening control structure to reduce the opening degree of the interceptor orifice 150. Specifically, the liquid level sensing structure 200 can be a float that changes with the liquid level height. The float can be made of metal and is hollow inside. Of course, in other embodiments, the liquid level sensing structure 200 can be other structures with buoyancy. It is not required that the liquid level sensing structure 200 be linked to the opening control structure on all its movement paths. For example, referring to… Figure 3 When the liquid level sensing structure 200 rises to the point that the opening control structure completely closes the interceptor hole 150, and the opening control structure can no longer descend, the liquid level sensing structure 200 may continue to rise with the liquid level, but it cannot continue to drive the opening control structure to descend.

[0029] This invention utilizes a liquid level sensing structure 200 to control the vertical movement of the opening and closing mechanism, thereby switching the opening and closing of the intercepting hole 150 and adjusting its degree of opening and closing. This intercepting well eliminates the need for online water quality monitoring instruments such as COD, conductivity, and turbidity meters to achieve initial rainwater interception. After rainwater enters the distribution well 110, it flows into the power well 120, at which point the intercepting hole 150 is at its maximum opening, and the initial rainwater is discharged from the intercepting hole 150. As the liquid level in the power well 120 gradually rises, the liquid level sensing structure 200 rises, and the linkage opening control structure reduces the opening degree of the intercepting hole 150 until, after a period of time, the intercepting hole 150 closes. At this point, as time goes by and rainwater continues to wash the ground, the rainwater has become clean rainwater. Because the intercepting hole 150 is closed, the liquid level continues to rise until it is discharged from the clean rainwater outlet pipe, and the clean rainwater can be directly discharged into the city's water bodies. This achieves the treatment of different flow paths for initial rainwater and clean rainwater, minimizing the pollution of water bodies by initial rainwater. At the same time, it does not require the installation of electrically controlled valves or gates, does not require external power, has a wide range of applications, is low-carbon and energy-saving, has low construction costs, and is easy to maintain.

[0030] In a preferred embodiment of the present invention, a flow control gate 300 is also included. The flow control gate 300 is placed inside the water distribution well 110 and its position can be adjusted to control the opening degree of the inlet 140. The flow control gate 300 is close to or attached to the well wall of the water distribution well 110. By raising and lowering, the opening degree of the inlet is controlled, thereby adjusting the liquid level rise and fall rate of the power well 120, thereby controlling the closing time of the intercepting hole 150, and thus adjusting the time when rainwater enters the clean rainwater outlet pipe 102. This allows for the adjustment of the time when rainwater flows into the intercepting hole 150 and when clean rainwater enters the clean rainwater outlet pipe 102, which can be adjusted according to actual conditions to improve adaptability. By adjusting the opening degree of the inlet 140, the filling time of the power well 120 is controlled, enabling accurate differentiation between initial rainwater and clean rainwater from the perspective of rainfall duration.

[0031] Furthermore, referring to Figure 2 An adjusting chain 310 is connected to the upper end of the flow control gate 300. An anchor hook is fixed inside the well cavity above the flow control gate 300. Chain links at different positions on the adjusting chain 310 are hooked onto the anchor hook to adjust the height of the flow control gate 300. Specifically, the adjusting chain 310 is composed of multiple chain links connected in series. One end of the anchor hook is inserted into the well wall of the well cavity and can be fixed by an expansion bolt. The other end is provided with a hook to allow the chain links to engage and prevent them from detaching from the anchor hook. Preferably, the anchor hook is located near the well opening, so that it can be operated directly by hand after opening the well cover without having to go down into the well. In addition, the well wall of the water distribution well 110 can also be provided with a sliding groove for the flow control gate 300 to slide up and down, so as to guide the movement of the flow control gate 300.

[0032] Furthermore, the opening control structure is a intercepting gate 160 placed inside the water distribution well 110. The well wall of the water distribution well 110 is provided with a lifting ring 220 located above the intercepting hole 150. The intercepting gate 160 is connected to the liquid level sensing structure 200 by a transmission chain 210 passing through the lifting ring 220. The lifting ring 220 is used to suspend the intercepting gate 160. The transmission chain 210 extends upward from the liquid level sensing structure 200 and passes around or through the wall between the water distribution well 110 and the power well 120, and then passes through the lifting ring 220 to connect with the intercepting gate 160. During the lifting and lowering process, the intercepting gate 160 approaches or fits against the inner wall of the water distribution well 110 to adjust the opening of the intercepting hole 150. The well wall of the water distribution well 110 may also be provided with a sliding groove for the intercepting gate 160 to slide up and down, so as to guide the lifting and lowering of the intercepting gate 160. The rise or fall of the liquid level sensing structure 200, via the transmission chain 210 and the lifting ring 220, controls the rise or fall of the intercepting gate 160. Specifically, the gravity of the intercepting gate 160 is greater than its buoyancy, the buoyancy of the liquid level sensing structure 200 is greater than its own gravity, and the gravity of the liquid level sensing structure 200 is greater than that of the intercepting gate 160. Through the combined effect of gravity and buoyancy, the raising and lowering of the intercepting gate 160 is controlled.

[0033] Of course, in other embodiments, the opening control structure can also be a valve, and the liquid level sensing structure 200 is connected to the valve control mechanism through a transmission structure to control the valve opening.

[0034] Furthermore, the bottom of the inlet end of the interceptor hole 150 is higher than the bottom of the inlet end of the inlet hole 140. This means that after water enters the distribution well 110, it preferentially enters the power well 120 through the inlet hole 140, ensuring the stability of the water intake into the power well 120. This allows the level sensing structure 200 and the opening control structure, which are linked to the power well's liquid level, to function stably. Specifically, the bottom of the inlet hole 140 is flush with the bottom wall of the distribution well 110, while the bottom of the interceptor hole 150 is higher than the bottom wall of the distribution well 110. For example, if the bottom of the interceptor hole 150 is 50mm higher than the bottom wall of the distribution well 110, this can be adjusted adaptively according to actual conditions, and no specific limitation is imposed here.

[0035] Furthermore, the well cavity also includes a clean rainwater well 170, which is connected to a distribution well 110. The distribution well 110 is connected to a rainwater inlet pipe 101. The inlet end of the clean rainwater outlet pipe 102 extends to the well wall of the clean rainwater well 170. Rainwater enters the distribution well 110 from the rainwater inlet pipe 101. When the liquid level in the distribution well 110 reaches a certain height, the rainwater enters the clean rainwater well 170 and is finally discharged from the clean rainwater outlet pipe 102.

[0036] To prevent rainwater from disturbing the transmission chain 210, the transmission chain 210 passes over the rainwater inlet pipe 101, so that the rainwater entering through the rainwater inlet pipe 101 will not directly impact the transmission chain 210.

[0037] Furthermore, referring to Figure 5 The bottom of the clean rainwater well 170 is separated from the water distribution well 110 by a partition wall 171. The bottom of the clean rainwater well 170 is filled with a filling layer 172. The upper surface of the filling layer 172 is flush with the upper end of the partition wall 171 and the bottom of the inlet pipe of the clean rainwater outlet pipe 102. In this way, the rainwater entering the clean rainwater well 170 can be directly discharged from the clean rainwater outlet pipe 102, avoiding the long-term accumulation of rainwater in the clean rainwater well 170, which would make the well continuously damp, breed bacteria, and hinder manual maintenance.

[0038] The well cavity also includes a sewage interception control well 130. The outlet end of the sewage interception hole 150 extends to the sewage interception control well 130, which is connected to the initial rainwater outlet pipe 103. The bottom of the power well 120 is connected to the sewage interception control well 130 via a drain pipe 180. After the rain stops, the rainwater in the power well 120 can be discharged into the sewage interception control well 130 through the drain pipe 180, and finally discharged into the subsequent pipeline from the initial rainwater outlet pipe 103. The sewage interception control well 130 is used to collect the rainwater flowing into the drain pipe 180 and the sewage interception hole 150 and finally discharge it from the initial rainwater outlet pipe 103, introducing the initial rainwater into the subsequent sewage treatment plant for purification.

[0039] Reference Figure 1 and Figure 4 Specifically, the intercepting and control well 130, the water distribution well 110, and the power well 120 are located on the same side of the clean rainwater well 170 and are separated by walls. The walls between the clean rainwater well 170 and the intercepting and control well 130, and between the clean rainwater well 170 and the power well 120, are higher than the partition wall 171 and the top of the rainwater inlet pipe 101, so as to prevent rainwater entering the clean rainwater well 170 from easily flowing into the intercepting and control well 130 and the power well 120.

[0040] Furthermore, referring to Figure 2 The bottom of the inlet end of the initial rainwater outlet pipe 103 is flush with the bottom wall of the intercepting control well 130, so that after the rain stops, the initial rainwater outlet pipe 103 can drain the rainwater from the intercepting control well 130, reducing water accumulation. The bottom of the intercepting control well 130 is provided with a guide slope 131, which extends downward towards the initial rainwater outlet pipe 103, thereby guiding the rainwater into the initial rainwater outlet pipe 103 and draining the rainwater as cleanly as possible.

[0041] Specifically, the bottom of the outlet end of the rainwater inlet pipe 101 is higher than or level with the bottom of the inlet end of the clean rainwater outlet pipe 102 to avoid rainwater residue and accumulation in the upstream pipe.

[0042] The working principle of the initial rainwater interception well with a cleaning structure is as follows: 1. In the initial stage of rainfall, surface runoff enters the rainwater inlet pipe 101 through the rainwater inlet and is discharged into the distribution well 110. Because the bottom elevation of the distribution well 110 is higher than that of the power well 120 and the sewage interception control well 130, and the bottom elevation of the inlet hole 140 of the power well is lower than that of the sewage interception hole 150, the initial rainwater in the distribution well 110 preferentially enters the power well 120.

[0043] 2. The liquid level sensing structure 200 (float) in the power well 120 floats up, the opening control structure (sewage interceptor gate 160) moves down, and the sewage interceptor 150 is gradually closed. The sewage interception control well 130 completes the initial rainwater interception, and the clean rainwater enters the clean rainwater well 170 and is discharged into the downstream municipal rainwater pipe through the clean rainwater outlet pipe 102.

[0044] 3. When the rain stops, the water accumulated in the power well 120 is discharged into the sewage interception control well 130 through the drain pipe 180. The liquid level sensing structure 200 (float) descends, the sewage interception gate 160 is pulled back, the sewage interception hole 150 is gradually opened, and the sewage interception control well 130 resumes its sewage interception capacity.

[0045] When there is very little rainfall, rainwater washes the ground and flows into the distribution well 110, causing serious rainwater pollution. The rainwater flowing into the distribution well 110 flows into the power well 120 through the inlet 140. However, the water inflow into the power well 120 is less than the drainage flow of the drain pipe 180. The liquid level sensing structure 200 (float) does not activate, and the interception hole 150 is normally open. The sewage flowing into the power well 120 also flows into the interception control well 130 through the drain pipe 180. All surface runoff rainwater is intercepted and diverted to the sewage pipe network.

[0046] Furthermore, when the rainfall is heavy, the ground can be washed quickly. The heavier the rainfall, the faster the rainwater entering the distribution well 110 becomes clean rainwater, and the shorter the initial rainfall time. The heavier the rainfall, the faster the liquid level sensing structure 200 (float) in the power well 120 rises, and the faster the interception hole 150 closes, thus completing the initial rainwater interception more quickly. This corresponds to the rainwater entering the distribution well 110 becoming clean rainwater more quickly, achieving adaptive regulation. This avoids the situation where the initial rainwater interception time is too long when the rainfall is heavy, resulting in a large amount of clean rainwater being discharged into the sewage pipe network, thereby increasing the load on the sewage pipe network.

[0047] Furthermore, referring to Figure 6 It also includes a cleaning structure 400, which can move within the drain pipe 180 to clean the inner wall of the drain pipe 180, so as to prevent the drain pipe 180 from being blocked and affecting the drainage of the power well 120.

[0048] Specifically, refer to Figure 9 and Figure 11 The cleaning structure 400 includes a sliding sleeve 410 and a scraper 420. The scraper 420 is fixed to the outer peripheral wall of the sliding sleeve 410 and arranged at intervals around the periphery. The drain pipe 180 has a coaxial guide rod 181 at its center. The sliding sleeve 410 is sleeved on the guide rod 181 and can move along the guide rod 181. The scraper 420 has a gap with the inner wall of the drain pipe 180 to reduce sliding resistance. The scraper 420 can clean the dirt accumulated on the inner wall of the drain pipe 180 by moving along the guide rod 181.

[0049] The cleaning of structure 400 can be achieved using a motor or other power mechanism. In this embodiment, refer to... Figures 6 to 8 To reduce the use of electronic components, the cleaning structure 400 can reciprocate within the drain pipe 180 as the liquid level sensing structure 200 rises and falls, thereby cleaning the inner wall of the drain pipe 180. Specifically, as... Figure 6 and Figure 8 As shown, the liquid level sensing structure 200 (float) is connected to both ends of the cleaning structure 400 via a first connecting chain 230 and a second connecting chain 240. One end of the first connecting chain 230 is connected to the cleaning structure 400, and the other end extends from the drain pipe 180 toward the opening of the power well 120 and is connected to the liquid level sensing structure 200 (float). One end of the second connecting chain 240 is connected to the cleaning structure 400, and the other end is connected to the liquid level sensing structure 200 (float). The second connecting chain 240 extends from the drain pipe 180 toward the opening of the intercepting control well 130, and extends upwards before horizontally passing through the partition wall between the intercepting control well 130 and the water distribution well 110, and the partition wall between the power well 120 and the water distribution well 110, entering the power well 120 to connect with the liquid level sensing structure 200 (float). The second connecting chain 240 passes over the rainwater inlet pipe 101. To simplify the structure, one end of the second connecting chain 240 is connected to the drive chain 210 to share a portion of the length of the drive chain 210. It is understood that, to reduce the extension paths of the second connecting chain 240 and the drive chain 210, holes can be drilled in the corresponding wall to allow the second connecting chain 240 and the drive chain 210 to pass through. Furthermore, to reduce resistance, steering wheels can be installed at the turning points of the extension paths of the first connecting chain 230, the second connecting chain 240, and the drive chain 210.

[0050] Furthermore, such as Figure 9As shown, to avoid the short travel of the level sensing structure 200 (float) causing the range of motion of a single sliding sleeve 410 to not cover the drain pipe 180, multiple sets of sliding sleeves 410 and scrapers 420 are arranged along the guide rod 181, and adjacent sliding sleeves 410 are connected by a series chain 430. The first connecting chain 230 is connected to the sliding sleeve 410 closest to the power well 120, and the second connecting chain 240 is connected to the sliding sleeve 410 closest to the intercepting control well 130, thereby achieving a more comprehensive cleaning of the drain pipe 180.

[0051] To improve the smoothness of sliding of the cleaning structure 400, in some embodiments, ball bearings may be embedded in the inner wall of the sliding sleeve 410 or the outer wall of the guide rod 181 to convert sliding friction into rolling friction and reduce frictional resistance. Of course, other methods can also be used to reduce friction, such as smoothing the surfaces of the inner wall of the sliding sleeve 410 and the outer wall of the guide rod 181.

[0052] It should be noted that the cleaning structure 400 does not directly scrape the dirt off the inner wall of the drain pipe 180 with the scraper 420. Instead, it scrapes the dirt off the inner wall of the drain pipe 180, so that the dirt does not adhere to the inner wall of the drain pipe 180. After the scraper 420 loosens the dirt, it can be discharged from the drain pipe 180 with the water flow. Obviously, the resistance encountered when loosening the dirt is much smaller than the resistance encountered when scraping the dirt out of the drain pipe 180, thus avoiding the cleaning structure 400 from getting stuck or encountering greater resistance. In addition, since the initial rainwater enters the power well 120 first, it will fill the drain pipe 180 and wet the dirt adhering to the drain pipe 180. As the water level gradually rises, the liquid level sensing structure 200 (float) will drive the sliding sleeve 410 and scraper 420 to move. At this time, the dirt has been wetted by the rainwater and is easily loosened by the scraper 420 with less resistance. The loosened dirt will also be discharged immediately with the water flow in the drain pipe 180 to the interception control well 130. By utilizing the structural characteristics of the rainwater and the interception well, the effects of rainwater wetting dirt, dirt being loosened, and dirt being immediately flushed out with the water flow are achieved in sequence. The steps are coordinated and reasonable, thereby reducing the moving resistance of the cleaning structure 400 and quickly flushing the loosened dirt, resulting in a better cleaning effect. Furthermore, it is understandable that the drainage from the drain pipe 180 has a negligible impact on the liquid level in the power well 120 when rainwater enters. Only when the rain stops or the rainwater is very light (i.e., the water inlet 140 is less than the drainage from the drain pipe 180) will the liquid level in the power well 120 not rise but gradually decrease. When the rainwater is light, the pollution is heavier, and it needs to be completely discharged into the interception control well 130, which the drain pipe 180 can achieve. In addition, the resistance of the cleaning structure 400 does not substantially affect the raising and lowering of the liquid level sensing structure 200 (float) or its linkage with the opening control structure, and does not affect the operation of the liquid level sensing structure 200 (float). The most important function of reducing the resistance of the cleaning structure 400 is to prevent the scraper 420 from deforming or being damaged due to excessive resistance.

[0053] Reference Figure 10 Furthermore, in order to reduce structural interference, the scraper 420 is provided with sharp-angled protrusions 421 on the sides facing and away from the power well 120. Firstly, the sharp-angled protrusions 421 have a better effect on loosening dirt and less resistance. Secondly, when solid debris blocks the way, after the sharp-angled protrusions 421 come into contact with the solid debris, the slope of the sharp-angled protrusions 421 will cause the scraper 420 and the sliding sleeve 410 to rotate around the guide rod 181 to avoid the solid debris, so that the solid debris can pass through the gap between the scraper 420.

[0054] In municipal drainage systems, a stormwater inspection well is typically installed before the initial stormwater interception well with the cleaning structure of this invention. This stormwater inspection well is a sedimentation well, which collects the vast majority of solid impurities. (Refer to...) Figure 6 and Figure 7To further reduce the entry of larger solid debris into the drain pipe 180, a mesh baffle 190 is installed at the opening of the drain pipe 180 facing the power well 120. A settling trough 121 is provided on the bottom wall of the power well 120 below the opening of the drain pipe 180, allowing larger solid debris to settle in the settling trough 121. During manual maintenance, the material in the settling trough 121 can be periodically removed. Furthermore, there is a downward-facing water passage gap between the mesh baffle 190 and the wall of the power well 120 to prevent the mesh baffle 190 from becoming clogged and losing its water passage capacity. Additionally, the guide rod 181 is connected and fixed to the drain pipe 180 at both ends via connecting parts 182. The connecting parts 182 also limit the sliding sleeve 410, preventing it from detaching from the guide rod 181. The connecting parts 182 and the drain pipe 180 can be detachably connected using fasteners (screws, bolts, etc.) to facilitate the installation of the cleaning mechanism. In addition, to reduce wear, the mesh baffle 190 and the connecting part 182 are provided with clearance holes for the first connecting chain 230 or the second connecting chain 240 to pass through.

[0055] When the liquid level rises, the liquid level sensing structure 200 (float) rises accordingly, and pulls the cleaning structure 400 toward the power well 120 via the first connecting chain 230. When the liquid level falls, the liquid level sensing structure 200 (float) falls accordingly, and pulls the cleaning structure 400 toward the interception control well 130 via the second connecting chain 240. In this way, the rising and falling of the liquid level sensing structure 200 (float) drives the reciprocating movement of the cleaning structure 400, thereby cleaning the dirt accumulated on the inner wall of the drain pipe 180.

[0056] The present invention also provides a method for controlling initial rainwater interception, comprising the following steps: Includes the following steps: S1, according to the rainstorm intensity formula of the target area, obtain the rainfall duration t3 corresponding to the initial rainfall h in the target area; S2. Based on the water collection time t1 of the farthest water collection facility within the service range of the initial rainwater interception well with a cleaning structure, the transfer time t2 of the rainwater collected by the farthest water collection facility to the initial rainwater interception well with a cleaning structure, and the rainfall duration t3 obtained in step S1, the total water collection time T within the service range of the interception well is obtained. T = t1 + t2 + t3, where T is also the closing time of the opening control structure (sewage interception gate 160). The initial rainwater interception well with a cleaning structure completes the initial rainwater interception. When it rains, the rainwater on the ground will not immediately flow into the corresponding water collection facility, but will need to accumulate on the ground for a period of time before flowing into the water collection facility. The time for rainwater accumulation is the water collection time t1. The water collection time t1 can usually be taken as 5-10 minutes. The water collection range corresponding to a water collection facility (such as a ground drainage outlet) is controlled at 50-100m, which can be appropriately selected according to the actual situation. S3, adjust the opening degree of the power well inlet hole 140 to ensure that the power well is filled with water in time T when the initial rainfall is h. S4. Rainwater testing is conducted on the initial rainwater interception well with the cleaning structure, and water quality testing is performed on the rainwater that just flows into the clean rainwater outlet pipe 102. Specifically, under natural rainstorm conditions, rainwater testing is conducted on the initial rainwater interception well with the cleaning structure. As the opening control structure (sewage interceptor gate 160) closes, the liquid level in the distribution well 110 begins to rise until the rainwater enters the clean rainwater outlet pipe 102 and is discharged from the clean rainwater outlet pipe 102. Water quality testing is performed on the rainwater that just flows into the clean rainwater outlet pipe 102 to determine whether the water quality of the clean rainwater meets the standards for direct discharge. The water quality testing indicators include COD, SS, TP, TN, ammonia nitrogen, and other water quality indicators.

[0057] S5. If the water quality exceeds the standard, reduce the opening degree of the water inlet 140 and extend the water filling time of the power well 120. S6. Repeat steps S4 and S5 until the water quality meets the standards.

[0058] To minimize the amount of clean rainwater entering the intercepting control well 130, if the water quality in step S4 meets the standards, the opening degree of the inlet hole 140 can be gradually increased. Water quality testing is performed on the rainwater flowing into the clean rainwater outlet pipe 102 after each adjustment, until the water quality exceeds the standards. The second-to-last opening degree of the inlet hole 140 is then taken as the optimal opening degree. This means that the water quality in the last experiment exceeded the standards, while the water quality in the second-to-last experiment met the standards. This indicates that the opening degree of the inlet hole 140 in the second-to-last experiment can accurately separate the initial rainwater from the clean rainwater, preventing initial rainwater from entering the clean rainwater outlet pipe 102 and also preventing a large amount of clean rainwater from entering the intercepting control well 130. Step S3 sets the initial value of the inlet hole 140 opening degree based on the total water collection time T, avoiding the initial setting being too close to the appropriate opening degree and thus avoiding excessive subsequent experiments and wasting time.

[0059] Specifically, the formula for the intensity of the rainstorm in step S1 is: The unit for designing rainstorm intensity is 1. , , , and These are local parameters for the rainstorm intensity formula; The rainfall duration is expressed in minutes (min), and P is the design return period for the rainstorm. In this embodiment, the design return period for the rainstorm is set to 1 year, and the time duration to reach the initial rainfall amount h is calculated. The rainfall amount corresponding to each rainfall duration ti is hi (mm / min), h = ∑hi, and the rainfall duration t3 corresponding to reaching the control initial rainfall amount h is ∑ti (min). The initial rainfall amount h can be taken as 6-12 mm, with the lower limit taken for areas with low surface pollution and the upper limit taken for areas with high surface pollution. The h value can be selected according to the surface pollution level of the target area. Taking Changsha City as an example: Changsha City Rainstorm Intensity Formula: Given an initial rainfall of h = 9.7 mm for a certain plot of land, and P = 1 year, calculate the rainfall in mm / min for t = 1 min, 2 min, 3 min... as shown in Table 1. Table 1 At the end of the 5th minute, the cumulative rainfall h = 9.721 mm, which is close to the initial rainfall amount of 9.7 mm that needs to be controlled. Therefore, the t3 for this plot of land is 5 minutes.

[0060] In step S3, the filling time of the power well is T = V / Q, where V is the filling volume of the power well (m³). 3 Q is the flow rate (m³) through the 140 inlet hole. 3 / s). When the water head before the inlet 140 is not higher than the opening height of the inlet, the inlet flow rate is calculated as the weir flow rate: ,in, The contraction coefficient of the inlet hole 140 is taken as the single hole. =1; m is the free overflow coefficient, which is related to boundary conditions such as weir shape and weir height, and is taken as m=0.32; b is the width of the orifice (m), and g is the acceleration due to gravity, g=9.8m / s². 2 H0 represents the water depth (m) of the flow passage. The width b of the square inlet is the design value. The flow depth H0 of the inlet 140 is determined by adjusting the flow control gate 300. Under high-intensity rainfall (heavy rain, storm rain), the water head in front of the inlet 140 increases, forming outflow from the gate, increasing the Q value, shortening the filling time of the power well, and shortening the closing time of the intercepting hole. That is, the intercepting time is adaptively adjusted according to the rainfall intensity.

[0061] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An initial rainwater interception well with a cleaning structure, characterized in that, include: A well body (100) is formed with a well cavity, the well cavity including a water distribution well (110) and a power well (120) separated from each other. The well wall of the water distribution well (110) is provided with a sewage interception hole (150) and a water inlet hole (140) communicating with the power well (120). An opening control structure for adjusting the opening and closing degree of the sewage interception hole (150) is installed at the sewage interception hole (150). The well cavity is connected to a clean rainwater outlet pipe (102). The water distribution well ( The rainwater entering the clean rainwater outlet pipe (102) of 110) has an inlet water level higher than the inlet hole (140) and the intercepting hole (150); the well cavity also includes an intercepting control well (130), the outlet end of the intercepting hole (150) extends to the intercepting control well (130), the intercepting control well (130) is connected to the initial rainwater outlet pipe (103), and the bottom of the power well (120) is connected to the intercepting control well (130) through the drain pipe (180); A liquid level sensing structure (200) is installed inside the power well (120) and is connected to the opening control structure. The liquid level sensing structure (200) can move up and down with the change of liquid level in the power well (120). At least part of the moving path of the liquid level sensing structure (200) can be activated by the opening control structure to reduce the opening degree of the intercepting hole (150) when the liquid level sensing structure (200) rises. A cleaning structure (400) is movable within the drain pipe (180) to clean the inner wall of the drain pipe (180); The cleaning structure (400) can reciprocate within the drain pipe (180) as the liquid level sensing structure (200) rises and falls.

2. The initial rainwater interception well with a cleaning structure according to claim 1, characterized in that, The liquid level sensing structure (200) is connected to both ends of the cleaning structure (400) via a first connecting chain (230) and a second connecting chain (240); one end of the first connecting chain (230) is connected to the cleaning structure (400), and the other end extends from the drain pipe (180) toward the opening of the power well (120) and is connected to the liquid level sensing structure (200); one end of the second connecting chain (240) is connected to the cleaning structure (400), and the other end is connected to the liquid level sensing structure (200). 0) Connect, and the second connecting chain (240) extends from the drain pipe (180) toward the opening of the intercepting control well (130), and extends upward and then horizontally passes through the partition wall between the intercepting control well (130) and the water distribution well (110), the partition wall between the power well (120) and the water distribution well (110), and enters the power well (120) to connect with the liquid level sensing structure (200). The second connecting chain (240) goes around from above the rainwater inlet pipe (101).

3. The initial rainwater interception well with a cleaning structure according to claim 1, characterized in that, The cleaning structure (400) includes a sliding sleeve (410) and a scraper (420). The scraper (420) is fixed to the outer peripheral wall of the sliding sleeve (410) and arranged at intervals around the periphery. The drain pipe (180) has a coaxial guide rod (181) at its center. The sliding sleeve (410) is sleeved on the guide rod (181) and can move along the guide rod (181).

4. The initial rainwater interception well with a cleaning structure according to claim 3, characterized in that, A mesh baffle (190) is provided at the opening of the drain pipe (180) facing the power well (120), and a sinkhole (121) is provided on the bottom wall of the power well (120) below the opening of the drain pipe (180).

5. The initial rainwater interception well with a cleaning structure according to claim 4, characterized in that, The guide rod (181) is connected and fixed to the drain pipe (180) at both ends through the connecting part (182).

6. The initial rainwater interception well with a cleaning structure according to claim 5, wherein the grid baffle (190) and the connecting part (182) are provided with clearance for the first connecting chain (230) or the second connecting chain (240) to pass through.

7. The initial rainwater interception well with a cleaning structure according to claim 3, characterized in that, The sliding sleeve (410) and scraper (420) are provided in multiple sets and arranged along the guide rod (181), and adjacent sliding sleeves (410) are connected by a series chain (430).

8. The initial rainwater interception well with a cleaning structure according to claim 3, characterized in that, The scraper (420) has sharp protrusions (421) on its sides facing and away from the power well (120), and the scraper (420) and the sliding sleeve (410) can rotate around the guide rod (181).

9. The initial rainwater interception well with a cleaning structure according to claim 3, characterized in that, The scraper (420) has a gap with the inner wall of the drain pipe (180).

Images