Sponge city rainwater collection and treatment system and method

Abstract

The invention discloses a sponge city rainwater collection and treatment system and method, and the system comprises a collection pipe network which is used for collecting the radial flow of rainwater, a diversion unit which is used for receiving the collected rainwater and carrying out diversion treatment according to the water amount, and a greening water storage unit and a municipal water storage unit which are used for receiving the water flow of the diversion unit. A collecting cover plate for pre-filtering rainwater is arranged at a rainwater inlet of the collecting pipe network, and the municipal water storage unit is independently provided with a rainwater purification assembly or directly communicated with a water treatment system of the municipal pipe network; according to the invention, by arranging the diversion unit, rainwater can be distributed according to the water volume, and the rainwater is preferentially fed into the greening water storage unit and directly used for greening irrigation, and a complex water treatment process is not needed, so that the collection and treatment cost can be reduced while the rainwater is collected and utilized, and the purpose of saving water sources is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sponge cities, and in particular to a rainwater collection and treatment system and method for sponge cities. Background Art

[0002] Sponge city is a new generation of urban stormwater management concept. It collects and processes rainwater when it rains, and realizes the migration of rainwater in the city, thereby improving the utilization rate of water resources and reducing energy consumption.

[0003] Existing urban designs mostly discharge rainwater into rivers and other environments through sewer pipes, or collect and treat rainwater for municipal use. However, there are no special requirements for water quality for daily greening irrigation and other situations. If rainwater is treated uniformly before use, it will increase water treatment costs and is not conducive to energy conservation and efficiency improvement. Summary of the invention

[0004] Technical purpose: In view of the shortcomings of existing rainwater collection and treatment methods, the present invention discloses a sponge city rainwater collection and treatment system and method.

[0005] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: A sponge city rainwater collection and treatment system comprises a collecting pipe network for collecting radial flow of rainwater, a diversion unit for receiving the collected rainwater and performing diversion treatment according to the water volume, and a greening water storage unit and a municipal water storage unit for receiving the water flow of the diversion unit. The collecting pipe network is provided with a collecting cover plate for pre-filtering rainwater at the rainwater inlet, and the municipal water storage unit is independently provided with a rainwater purification component or is directly connected to the water treatment system of the municipal pipe network.

[0006] Preferably, the diversion unit of the present invention includes a water diversion box body directly connected to the gathering point of the collecting pipe network, and a partition is vertically arranged in the water diversion box body, the partition divides the interior of the water diversion box body into a water inlet chamber and a water diversion chamber, the water inlet chamber is connected to the gathering point of the collecting pipe network, and a connecting mechanism for switching the connection state with the rise and fall of the water level is arranged between the water inlet chamber and the water diversion chamber, the connecting mechanism is arranged on the upper part of the partition, and a rainwater sedimentation area is formed below the height of the connecting mechanism, and a first water diversion pipe and a second water diversion pipe are arranged on the water diversion chamber, the first water diversion pipe is connected to the greening water storage unit, and the second water diversion pipe is connected to the municipal water storage unit, and a switching mechanism for switching the connection state is arranged on the second water diversion pipe.

[0007] Preferably, the connecting mechanism of the present invention includes a connecting hole opened on the partition and an opening and closing cover plate arranged at the connecting hole. The upper portion of the opening and closing cover plate is rotatably connected to the partition, and a float that can rise and fall with the water level is arranged at the other end opposite to the rotating end. When rainwater is collected, the opening and closing cover plate is driven by the float to rotate to connect the water inlet chamber and the water diversion chamber.

[0008] Preferably, the switching mechanism of the present invention includes a switching shell, which is provided with a water inlet connected to the water diversion chamber and a water outlet connected to the second water diversion pipe. The switching shell is a columnar structure, and the water inlet and the water outlet are arranged along the axial direction of the switching shell. A floating block is slidably arranged in the switching shell, and the water outlet is located on the sliding path of the floating block. When the water in the water diversion chamber enters the switching shell along the water inlet, the floating block is floated by the force of the water pressure on the floating block, thereby connecting the path between the water inlet and the water outlet.

[0009] Preferably, the floating block of the present invention is connected to a preload spring at the end facing away from the water inlet.

[0010] Preferably, the collecting cover of the present invention comprises a fixed body and a baffle assembly arranged on the surface of the fixed body, the fixed body is provided with corresponding mesh holes for rainwater to enter the collecting pipe network, and the baffle assembly is arranged around the mesh holes along the radial direction of the fixed body to block debris carried in the rainwater.

[0011] Preferably, the baffle assembly of the present invention includes a mounting strip that is kept relatively fixed to the fixed body, the mounting strip is arranged along the radial direction of the fixed body and is evenly distributed along the circumferential direction of the fixed body, and a rotating baffle is arranged on the side of the mounting strip, and the end of the rotating baffle is rotatably matched with the mounting strip, so that the rotating baffle can be rotated relative to the mounting strip to adjust the blocking range covered.

[0012] Preferably, the rotating baffles on one side of the mounting strip of the present invention are mutually staggered along the radial direction of the fixed body, and when the rotating baffles are in an unfolded state, the ends of the adjacent rotating baffles overlap.

[0013] The present invention also discloses a rainwater collection and treatment method for a sponge city. By using the above-mentioned collection and treatment system, rainwater is collected into a diversion unit through a collecting pipe network, and the diversion unit introduces rainwater into a greening water storage unit and a municipal water storage unit according to the amount of water. When the diversion unit performs diversion, the rainwater is preferentially sent to the greening water storage unit after filtering through a provided water diversion box, and the collected rainwater is directly used for greening irrigation. When the amount of rainwater is large and exceeds the receiving limit of the greening water storage unit, the rainwater is sent to the municipal water storage unit, and the rainwater in the municipal water storage unit is filtered and disinfected before entering the municipal water circulation.

[0014] Preferably, when the water diversion box of the present invention diverts rainwater, the rainwater first enters the water inlet chamber of the water diversion box, and settles during the rising process of the rainwater level. When the water level drives the float to move up to open the opening and closing cover, the rainwater enters the water diversion chamber from the connecting hole, and flows to the greening water storage unit through the first water diversion pipe of the water diversion chamber. After the water level covers the height of the switching shell, pressure is generated on the floating block in the switching shell. When the pressure generated by the water level pushes the floating block to slide in the switching shell, as the floating block slides, the water outlet connects the switching shell with the second water diversion pipe, and the excess rainwater enters the municipal water storage unit from the second water diversion pipe. The rainwater in the municipal water storage unit enters the municipal water circulation after filtration and disinfection.

[0015] Beneficial effects: The sponge city rainwater collection and treatment system and method disclosed in the present invention have the following beneficial effects: 1. The present invention is provided with a diversion unit, which can distribute rainwater according to the water volume, and give priority to sending rainwater into the greening water storage unit, which is directly used for greening irrigation without the need for a complicated water treatment process. In this way, the collection and utilization of rainwater can be achieved while reducing the cost of collection and treatment and achieving the purpose of saving water resources.

[0016] 2. The water diversion box of the present invention is provided with a connecting mechanism to switch the connecting state between the water inlet chamber and the water diversion chamber, and a sedimentation area is formed below the connecting mechanism, so that the debris carried in the rainwater can be first settled, and then enter the water diversion chamber for distribution after reaching a certain water level; the pre-sedimentation method can reduce the sediment in the subsequent pipeline, thereby reducing the risk of pipeline blockage. At the same time, the debris, soil, etc. are settled in the water inlet chamber and can be cleaned up in a centralized and unified manner. Compared with the siltation cleaning inside the pipeline, it is less difficult and easier to operate.

[0017] 3. An opening and closing cover plate that rotates with the rise and fall of the water level is provided at the connecting hole of the present invention. When there is no rainwater and the water level of the rainwater has not reached the discharge height, the opening and closing cover plate keeps the connecting hole in a closed state, thereby preventing sludge and debris from entering the water diversion chamber, thereby playing a protective role.

[0018] 4. The switching mechanism in the second water distribution pipe of the present invention switches the connection state between the water inlet and the water outlet by means of a floating block that slides with the change of water pressure, and can automatically send excess rainwater into the municipal water storage unit according to the water volume. The height and the preset pressure can enable the water distribution chamber to withstand a certain degree of water volume fluctuation, so that more water can be sent to the greening water storage unit, thereby reducing the amount of rainwater that needs to be filtered and disinfected, and saving energy loss caused by water treatment.

[0019] 5. The present invention arranges a collecting cover at the collecting point of the collecting pipe network, and the collecting cover can intercept debris such as branches carried in the initial rainwater on the outside of the mesh, thereby maintaining smooth flow and ensuring the collection effect of rainwater.

[0020] 6. The collecting cover of the present invention blocks debris through an adjustable rotating baffle, and the ends of adjacent rotating baffles overlap in the circumferential direction of the fixed body, thereby forming an intermittent backflow channel, through which rainwater can flow and pass smoothly, and debris can be effectively blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0022] Figure 1 This is a connection diagram of the rainwater collection and treatment system of the present invention; Figure 2 This is a structural diagram of the water distribution unit of the present invention; Figure 3 This is a structural diagram of the switching mechanism of the present invention; Figure 4 The structural diagram of the cover plate is collected for the present invention; Among them, 1-collecting pipe network, 2-diversion unit, 3-greening water storage unit, 4-municipal water storage unit, 5-collecting cover, 6-water diversion box, 7-partition, 8-water inlet chamber, 9-water diversion chamber, 10-connecting mechanism, 11-first water diversion pipe, 12-second water diversion pipe, 13-connecting hole, 14-opening and closing cover, 15-float, 16-switching shell, 17-water inlet, 18-water outlet, 19-floating block, 20-pre-stressed spring, 21-fixed body, 22-mesh, 23-mounting strip, 24-rotating baffle. DETAILED DESCRIPTION

[0023] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by way of explanation of the apparatus, composition and materials of the present disclosure, rather than limitation. On the contrary, the following description provides a convenient illustration of an exemplary embodiment for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations may be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0024] like Figure 1-Figure 4As shown, the present invention discloses a sponge city rainwater collection and treatment system, including a collecting pipe network 1 for collecting radial flow of rainwater, a diversion unit 2 for receiving the collected rainwater and performing diversion treatment according to the water volume, and a greening water storage unit 3 and a municipal water storage unit 4 for receiving the water flow of the diversion unit 2. The collecting pipe network 1 is provided with a collecting cover plate 5 for pre-filtering rainwater at the rainwater inlet, and the municipal water storage unit 4 is independently provided with a rainwater purification component or is directly connected to the water treatment system of the municipal pipe network.

[0025] The collection pipe network 1 of the present invention is arranged according to the terrain to ensure that rainwater can be collected in time when it rains, so that the rainwater flows to the collection point of the collection pipe network under the action of gravity. Figure 1 As shown, it is an artificially constructed rainwater well, and the rainwater well flows to the diversion unit 2 through a pipeline or a laid underground flow channel, and is distributed and transported to the corresponding greening water storage unit 3 or the municipal water storage unit 4 by the diversion unit, and the water storage unit is connected to the collection point of the corresponding collection pipe network according to demand. Each water storage unit can be connected to multiple collection points at the same time. The flow of rainwater between the units is realized through the laid pipelines. Figure 1 green water storage unit 3 and the municipal water storage unit 4 can be a reservoir dug underground, in which facilities such as a water pump capable of transporting water are provided so that the water in the reservoir can be transported to the outside when necessary.

[0026] like Figure 2 As shown, the diversion unit 2 of the present invention includes a water diversion box 6 directly connected to the gathering point of the collecting pipe network, a partition 7 is vertically arranged in the water diversion box 6, and the partition 7 divides the inside of the water diversion box 6 into a water inlet chamber 8 and a water diversion chamber 9. The water inlet chamber 8 is connected to the gathering point of the collecting pipe network 1, and a connecting mechanism 10 for switching the connection state with the rise and fall of the water level is arranged between the water inlet chamber 8 and the water diversion chamber 9. The connecting mechanism 10 is arranged on the upper part of the partition 7, and a rainwater sedimentation area is formed below the height of the connecting mechanism 10. A first water diversion pipe 11 and a second water diversion pipe 12 are arranged on the water diversion chamber 9, the first water diversion pipe 11 is connected to the greening water storage unit 3, and the second water diversion pipe 12 is connected to the municipal water storage unit 4, and a switching mechanism for switching the connection state is arranged on the second water diversion pipe 12.

[0027] In a specific embodiment, Figure 2As shown, the connecting mechanism 10 of the present invention includes a connecting hole 13 opened on the partition 7 and an opening and closing cover plate 14 arranged at the connecting hole 13. The upper part of the opening and closing cover plate 14 is rotatably connected to the partition 7, and a floating ball 15 that can rise and fall with the water level is arranged at the other end opposite to the rotating end. When collecting rainwater, the floating ball 15 drives the opening and closing cover plate 14 to rotate to connect the water inlet chamber 8 and the water diversion chamber 9. The setting of the connecting mechanism 10 makes it possible for rainwater to enter the water diversion chamber 9 from the connecting hole only when the water level is higher than the connecting hole. Compared with the direct overflow discharge method, the separation between the water diversion chamber 9 and the water inlet chamber 8 can be maintained to prevent floating objects that have not settled in the rainwater from entering the water diversion chamber, so that the debris carried by the rainwater can be collected in the water inlet chamber 8. When dredging is needed, the water inlet chamber 8 can be directly cleaned. Compared with the situation of cleaning the siltation in the water diversion pipe at a later time, the present invention can greatly reduce the cleaning difficulty and reduce the maintenance cost of the rainwater collection and treatment system.

[0028] like Figure 3 As shown, the switching mechanism of the present invention includes a switching housing 16, and the switching housing 16 is provided with a water inlet 17 connected to the water distribution chamber and a water outlet 18 connected to the second water distribution pipe 12. The switching housing 16 is a columnar structure, and the water inlet 17 and the water outlet 18 are arranged along the axial direction of the switching housing 16. A floating block 19 is slidably arranged in the switching housing 16, and the water outlet 18 is located on one side of the sliding path of the floating block 19. The floating block 19 is connected to a preload spring 20 at the end away from the water inlet. The two ends of the preload spring 20 are respectively abutted against the floating block 19 and the inner wall of the switching housing 16, providing the floating block 19 with downward pressure in the direction shown in the figure. When the water in the water distribution chamber 9 enters the switching housing 16 along the water inlet 17, the floating block 19 is floated by the force of the water pressure on the floating block 19, and the path between the water inlet 17 and the water outlet 18 is connected. The switching mechanism of the present invention is used to control the connection state between the second water distribution pipe 12 and the water distribution chamber 9, and gives priority to ensuring that rainwater enters the greening water storage unit 3, thereby realizing rainwater collection and use, saving water resources and reducing processing costs.

[0029] When collecting rainwater, the rainwater will carry debris on the road surface in the initial stage, which is easy to cause blockage. For this reason, the present invention sets a collecting cover plate 5 at the collecting point of the collecting pipe network 1, which can not only provide protection, but also pre-intercept the debris in the rainwater when the rainwater flows. The structure of the collecting cover plate 5 is as follows: Figure 4As shown, the collecting cover plate 5 of the present invention includes a fixed body 21 and a baffle assembly arranged on the surface of the fixed body 21, the fixed body 21 is correspondingly provided with mesh holes 22 for rainwater to enter the collecting pipe network 1, and the baffle assembly is arranged around the mesh holes 22 along the radial direction of the fixed body 21 to block the sundries carried by the rainwater; the baffle assembly includes a mounting bar 23 relatively fixed to the fixed body 21, the mounting bar 23 is arranged along the radial direction of the fixed body 21 and is evenly distributed along the circumferential direction of the fixed body 21, and a rotating baffle 24 is arranged on the side of the mounting bar 23, and the end of the rotating baffle 24 is connected to the fixed body 21. The mounting bar 23 realizes rotational cooperation by means of a rotating shaft or a hinge. A stopper can be set on the surface of the fixed body 21 within the rotation path range of the rotating baffle 24, or other structures that can limit the continued rotation of the rotating baffle 24 can be adopted to limit the maximum rotation angle of the rotating baffle 24 relative to the mounting bar 23 to avoid the ends of the rotating baffle 24 contacting each other; the rotating baffle 24 can be rotated relative to the mounting bar 23 to adjust the blocking range covered, and compared with the fixed baffle structure, it is also beneficial to clean up the debris intercepted near the central area of ​​the fixed body 21.

[0030] In order to further improve the interception effect of debris and not affect the flow of rainwater, as a preferred embodiment, the rotating baffles 24 on one side of the mounting strip 23 of the present invention are mutually staggered along the radial direction of the fixed body, and when the rotating baffles 24 are in the unfolded state, the ends of the adjacent rotating baffles overlap. Figure 4 As shown, along the radial direction of the fixed body 21, the rotating baffle forms an intermittent return path, so that the debris is intercepted by the rotating baffle and is located between the rotating baffle and the mounting strip, while the rainwater flows along the profile of the rotating baffle 24 to the gap formed between the two rotating baffles, and continues to flow to the mesh 22 at the center of the fixed body 21, thereby achieving rainwater collection while reducing the debris carried in the rainwater and reducing the risk of the mesh 22 being blocked.

[0031] The present invention also discloses a rainwater collection and treatment method for a sponge city. By using the above-mentioned collection and treatment system, rainwater is collected into a diversion unit through a collecting pipe network, and the diversion unit introduces rainwater into a greening water storage unit and a municipal water storage unit according to the amount of water. When the diversion unit performs diversion, the rainwater is preferentially sent to the greening water storage unit after filtering through a provided water diversion box, and the collected rainwater is directly used for greening irrigation. When the amount of rainwater is large and exceeds the receiving limit of the greening water storage unit, the rainwater is sent to the municipal water storage unit, and the rainwater in the municipal water storage unit is filtered and disinfected before entering the municipal water circulation.

[0032] When the water diversion box of the present invention is used for rainwater diversion, the rainwater first enters the water inlet chamber of the water diversion box, and settles during the rising process of the rainwater level. When the water level drives the float ball to move upward to open the opening and closing cover, the rainwater enters the water diversion chamber from the connecting hole, and flows to the greening water storage unit through the first water diversion pipe of the water diversion chamber. After the water level covers the height of the switching shell, pressure is generated on the floating block in the switching shell. When the pressure generated by the water level pushes the floating block to slide in the switching shell, as the floating block slides, the water outlet connects the switching shell with the second water diversion pipe, and the excess rainwater enters the municipal water storage unit from the second water diversion pipe. The rainwater in the municipal water storage unit enters the municipal water circulation after filtration and disinfection. For the water treatment when the rainwater in the municipal water storage unit is incorporated into the municipal pipe network, the existing water treatment means can be directly applied to achieve the purification of the rainwater so that it meets the water quality requirements of municipal water. The present invention will no longer elaborate on the specific water treatment means.

Claims

1. A sponge city rainwater collection and treatment system, characterized in that: The invention comprises a collection pipe network (1) for collecting radial flow of rainwater, a diversion unit (2) for receiving the collected rainwater and performing diversion treatment according to the water volume, and a greening water storage unit (3) and a municipal water storage unit (4) for receiving the water flow of the diversion unit (2). The collection pipe network (1) is provided with a collection cover plate (5) for pre-filtering the rainwater at the rainwater inlet, and the municipal water storage unit (4) is independently provided with a rainwater purification component or is directly connected to the water treatment system of the municipal pipe network.

2. A sponge city rainwater collection and treatment system according to claim 1, characterized in that: The diversion unit (2) comprises a water diversion box (6) directly connected to a collection point of a collection pipe network, a partition (7) is vertically arranged in the water diversion box (6), the partition (7) divides the inside of the water diversion box (6) into a water inlet chamber (8) and a water diversion chamber (9), the water inlet chamber (8) is connected to the collection point of the collection pipe network (1), a connecting mechanism (10) is arranged between the water inlet chamber (8) and the water diversion chamber (9), and the connecting mechanism (10) is switched in connection state with the rise and fall of the water level, the connecting mechanism (10) is arranged on the upper part of the partition (7), and a rainwater settling area is formed below the height of the connecting mechanism (10), a first water diversion pipe (11) and a second water diversion pipe (12) are arranged on the water diversion chamber (9), the first water diversion pipe (11) is connected to the greening water storage unit (3), and the second water diversion pipe (12) is connected to the municipal water storage unit (4), and a switching mechanism for switching the connection state is arranged on the second water diversion pipe (12).

3. A sponge city rainwater collection and treatment system according to claim 2, characterized in that: The connecting mechanism (10) comprises a connecting hole (13) formed on the partition (7) and an opening and closing cover plate (14) arranged at the connecting hole (13); the upper portion of the opening and closing cover plate (14) is rotatably connected to the partition (7); a floating ball (15) which can rise and fall with the water level is arranged at the other end opposite to the rotating end; when rainwater is collected, the floating ball (15) drives the opening and closing cover plate (14) to rotate, thereby connecting the water inlet chamber (8) and the water diversion chamber (9).

4. A sponge city rainwater collection and treatment system according to claim 2, characterized in that: The switching mechanism comprises a switching housing (16), the switching housing (16) being provided with a water inlet (17) connected to the water distribution chamber and a water outlet (18) connected to the second water distribution pipe (12); the switching housing (16) being a columnar structure; the water inlet (17) and the water outlet (18) being arranged along the axial direction of the switching housing (16); a floating block (19) being slidably arranged in the switching housing (16); the water outlet (18) being located on a sliding path of the floating block (19); when water in the water distribution chamber (9) enters the switching housing (16) along the water inlet (17), the floating block (19) is floated upward by the force of water pressure acting on the floating block (19), thereby connecting the path between the water inlet (17) and the water outlet (18).

5. A sponge city rainwater collection and treatment system according to claim 4, characterized in that: The floating block (19) is connected to a pre-compression spring (20) at the end facing away from the water inlet.

6. A sponge city rainwater collection and treatment system according to claim 1, characterized in that: The collecting cover plate (5) comprises a fixed body (21) and a baffle assembly arranged on the surface of the fixed body (21); mesh holes (22) for rainwater to enter the collecting pipe network (1) are arranged on the fixed body (21); the baffle assembly is arranged around the mesh holes (22) along the radial direction of the fixed body (21) to block debris carried by rainwater.

7. A sponge city rainwater collection and treatment system according to claim 6, characterized in that: The baffle assembly comprises a mounting bar (23) which is relatively fixed to the fixed body (21); the mounting bar (23) is arranged along the radial direction of the fixed body (21) and is evenly distributed along the circumferential direction of the fixed body (21); a rotating baffle (24) is arranged on the side of the mounting bar (23); the end of the rotating baffle (24) is rotatably matched with the mounting bar (23), so that the rotating baffle (24) can be rotated relative to the mounting bar (23) to adjust the blocking range covered.

8. A sponge city rainwater collection and treatment system according to claim 7, characterized in that: The rotating baffles (24) on one side of the mounting strips (23) that are close to each other are arranged to be staggered with each other in the radial direction of the fixed body, and when the rotating baffles (24) are in an unfolded state, the ends of the adjacent rotating baffles overlap.

9. A method for collecting and treating rainwater in a sponge city, using the collection and treatment system according to any one of claims 1 to 8, characterized in that: Rainwater is collected through the collecting pipe network and enters the diversion unit, which introduces the rainwater into the greening water storage unit and the municipal water storage unit according to the amount of water. When the diversion unit is diverting, the rainwater is first filtered and then sent to the greening water storage unit through the set water diversion box, and the collected rainwater is directly used for greening irrigation. When the amount of rainwater is large and exceeds the receiving limit of the greening water storage unit, the rainwater is sent to the municipal water storage unit, and the rainwater in the municipal water storage unit is filtered and disinfected before entering the municipal water circulation.

10. A method for collecting and treating rainwater in a sponge city according to claim 9, characterized in that: When the water diversion box is used to divert rainwater, the rainwater first enters the water inlet chamber of the water diversion box, and settles during the rising process of the rainwater level. When the water level drives the float ball to move up to open the opening and closing cover, the rainwater enters the water diversion chamber from the connecting hole, and flows to the greening water storage unit through the first water diversion pipe of the water diversion chamber. After the water level covers the height of the switching shell, pressure is generated on the floating block in the switching shell. When the pressure generated by the water level pushes the floating block to slide in the switching shell, as the floating block slides, the water outlet connects the switching shell with the second water diversion pipe, and the excess rainwater enters the municipal water storage unit from the second water diversion pipe. The rainwater in the municipal water storage unit enters the municipal water circulation after filtration and disinfection.

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