Modular distributed municipal road rain and sewage separation and purification device

Abstract

This invention relates to the field of municipal road drainage technology and discloses a modular distributed municipal road rainwater and sewage diversion and purification device, including a purification diversion box, a herringbone-shaped first filter plate, a rainwater collection chamber, a sewage collection chamber, a buoyancy switching component, and a delayed inlet and outlet mechanism. The buoyancy switching component uses a buoyancy component to control the alternating opening and closing of the two collection chambers. The delayed inlet and outlet mechanism controls the storage and drainage state of the buoyancy chamber through a temporary water storage tank, a second buoyancy component, a second sealing component, and an elastic switching mechanism. This invention can filter and collect rainwater from roads and utilize the rainwater's own hydraulic and buoyancy to achieve the separation of initial polluted rainwater from subsequent rainwater without external power, improving the stability of the diversion state maintenance and reset under fluctuating water flow conditions, while also facilitating modular layout and maintenance.

Description

Technical Field

[0001] This invention relates to the field of municipal road drainage technology, and in particular to a modular distributed municipal road rainwater and sewage separation and purification device. Background Technology

[0002] During rainfall, rainwater from municipal roads typically flows through storm drains into road storm drains and is further discharged into the stormwater pipe network. In the early stages of rainfall, dust, mud, sand, and other solid impurities deposited on the road surface are easily carried into the drainage system by runoff. Therefore, road storm drains are usually equipped with filtration, interception, or diversion structures to reduce the entry of larger impurities into the subsequent pipe network, and to discharge initial polluted rainwater and subsequent rainwater separately according to drainage needs.

[0003] In existing road stormwater and sewage separation devices, the drainage channels can be switched by water level changes or buoyancy. When the inflow is relatively stable, the corresponding separation function can be achieved. However, road rainfall has a certain degree of intermittency and fluctuation. When the inflow changes near the switching trigger condition, the active separation structure may be displaced with the change in liquid level, which will affect the maintenance and reset process of the separation state. At the same time, solid impurities carried in road rainwater need to be intercepted before entering the drainage system. Therefore, there is still room for improvement in how to improve the stability of the switching and maintenance of the stormwater and sewage separation state under the condition of no external power, while taking into account the filtration of road rainwater. Summary of the Invention

[0004] The technical problem this invention aims to solve is that existing road stormwater and sewage separation devices, while taking into account road rainwater filtration, are prone to fluctuations in water inflow that can affect the stability of the switching and maintenance of the stormwater and sewage separation state. To address this, we propose a modular distributed municipal road stormwater and sewage separation and purification device.

[0005] To achieve the above objectives, this application adopts the following technical solution: a modular distributed municipal road rainwater and sewage diversion and purification device, including a purification diversion box with an opening at the top, a first filter plate in the shape of a herringbone inside the purification diversion box, and a rainwater collection chamber and a sewage collection chamber connected to the inner cavity of the lower part. The purification diversion box is equipped with a buoyancy switching component, which includes two buoyancy chambers corresponding to the rainwater collection chamber and the sewage collection chamber respectively. A first buoyancy component is vertically and movably installed in each of the two buoyancy chambers. The two first buoyancy components are respectively connected to a first sealing component. The two first sealing components are used to control the opening and closing of the rainwater collection chamber and the sewage collection chamber respectively, and rise and fall with the corresponding first buoyancy component, so that the opening and closing states of the two collection chambers are opposite. The purification diversion box is equipped with a delayed water inlet and outlet mechanism, which includes a temporary water storage tank and a second buoyancy component, a second sealing component, and an elastic switching mechanism installed in the buoyancy cavity. The temporary water storage tank receives part of the rainwater filtered by the first filter plate and supplies water to the buoyancy cavity, and is linked with the second buoyancy component. The buoyancy cavity is connected to a drain pipe. The second sealing component is connected to the second buoyancy component and corresponds to the drain pipe. The elastic switching mechanism is used to maintain the open position or the closed position of the second sealing component, and changes the direction of elastic action after the second buoyancy component reaches the switching position, so that the second sealing component switches between the open position and the closed position.

[0006] Preferably, it also includes a roadbed, on which an installation groove is provided. The purification diversion box is detachably installed in the installation groove. A rain grate is detachably installed on the top of the installation groove. The rainwater collection chamber and the sewage collection chamber are respectively connected to the rainwater discharge system and the sewage collection system through corresponding rainwater connection channels and sewage connection channels in the roadbed.

[0007] Preferably, the first filter plate has downward sloping surfaces on both sides, a sludge collection box is provided on the side of the purification diversion box, the upper end of the sludge collection box is provided with a sludge inlet that communicates with the inner cavity of the purification diversion box and corresponds to the low point of the sloping surface of the first filter plate, and a second filter plate is provided at the lower end of the sludge collection box, which communicates with the lower inner cavity of the purification diversion box.

[0008] Preferably, the bottom of the two first buoyancy components is provided with guide posts, and the two guide posts extend into the rainwater collection chamber and the sewage collection chamber respectively and are connected to the corresponding first sealing components.

[0009] Preferably, the first sealing member is a conical plug, and the rainwater collection chamber and the sewage collection chamber are respectively provided with conical holes adapted to the first sealing member. When the two first sealing members rise synchronously with the corresponding first buoyancy members, they respectively detach from the conical holes corresponding to the rainwater collection chamber and enter the conical holes corresponding to the sewage collection chamber.

[0010] Preferably, the temporary water storage tank is located below the first filter plate and has an opening at the top. It has a through hole at the bottom for slow drainage. The temporary water storage tank is connected to an overflow pipe. The overflow pipe extends into the buoyancy chamber through the overflow port on the buoyancy chamber and connects to the second buoyancy component, so that the weight change of the temporary water storage tank is transmitted to the second buoyancy component, and the rainwater in the temporary water storage tank can enter the buoyancy chamber through the overflow pipe.

[0011] Preferably, the second sealing member is vertically and movably disposed within the buoyancy cavity and corresponds to the end of the drain pipe.

[0012] Preferably, the elastic switching mechanism includes a pendulum rod and an elastic element rotatably disposed within the buoyancy cavity. The free end of the pendulum rod is rotatably connected to the second buoyancy element via a traction rod. One end of the elastic element is connected to a position on the pendulum rod offset from its rotation center, and the other end is connected to the buoyancy cavity. The line of action of the elastic element can cross the rotation center of the pendulum rod as the pendulum rod swings, thereby reversing the rotational torque of the elastic element on the pendulum rod. When the line of action is located on different sides of the rotation center, it elastically holds the pendulum rod toward the corresponding extreme position.

[0013] Preferably, the lower end of the second buoyancy member is provided with a slip groove extending along its lifting direction, and the second sealing member is provided with a protrusion that extends into the slip groove. When the second buoyancy member is lifted or lowered, the slip groove can move relative to the protrusion first, and drive the second sealing member to move after the protrusion reaches the corresponding end of the slip groove.

[0014] Preferably, the drain pipe has a flushing pipe on its side wall, the flushing pipe is positioned toward the first filter plate, and the bottom of the drain pipe has at least one drain hole.

[0015] Preferably, the inner diameter of the flushing pipe is larger than the inner diameter of the drain hole, and / or the number of flushing pipes is greater than the number of drain holes.

[0016] The technical effects and advantages of this invention are as follows: This invention, by setting up a herringbone-shaped first filter plate, a sludge collection box, a buoyancy chamber, and a buoyancy switching component that cooperates with the rainwater collection chamber and the sewage collection chamber in the purification diversion box, allows road rainwater to undergo secondary interception and centralized collection of larger particulate impurities after entering the device. In the early stage of rainfall, it preferentially enters the sewage collection chamber. As the buoyancy chamber gradually fills with water, the first buoyancy component drives the first sealing component to complete the switching between the rainwater collection chamber and the sewage collection chamber, allowing subsequent rainwater to enter the rainwater collection chamber. Thus, impurity filtration, initial pollution rainwater interception, and subsequent rainwater discharge are all completed in the same modular device, achieving front-end physical purification and rainwater-sludge separation of road rainwater without the need for additional power drive.

[0017] This invention controls the drainage state of the buoyancy chamber through a temporary water storage structure and an elastic switching mechanism, keeping the buoyancy chamber in a water-storage state during continuous water inflow and rapidly releasing water after the water inflow weakens or stops. This improves the stability of the rainwater and sewage diversion switching and reset process and reduces the impact of short-term water volume fluctuations on the device's operating status. At the same time, the stored water discharged from the buoyancy chamber can be further used to rinse the easily contaminated areas of the first filter plate, achieving a synergistic effect of diversion control and self-cleaning of the filtration structure, thereby improving the device's continuous operation capability and maintenance convenience. Attached Figure Description

[0018] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram of the purification diversion box and mounting slot of the present invention in a disassembled state; Figure 3 This is a cross-sectional structural diagram of the purification diversion box of the present invention; Figure 4 This is a schematic diagram of the structure of the present invention with the drainage pipe, temporary water storage tank and first filter plate separated. Figure 5 For the present invention Figure 4 A structural diagram from the bottom perspective; Figure 6 This is a schematic diagram of the overall structure of the second buoyancy component and the elastic switching mechanism of the present invention; Figure 7 This is a schematic diagram of the structure of the second buoyancy member and the second sealing member in a separated state. Figure 8 This is a cross-sectional structural diagram of the sludge collection box and the purification diversion box of the present invention in a disassembled state.

[0019] Legend: 1. Roadbed; 2. Rain grate; 3. Sewage collection box; 4. Installation groove; 5. Purification diversion box; 6. First filter plate; 7. Buoyancy chamber; 8. Drainage pipe; 9. Overflow outlet; 10. First buoyancy component; 11. Guide column; 12. First sealing component; 13. Rainwater collection chamber; 14. Sewage collection chamber; 15. Second filter plate; 16. Sewage inlet; 17. Second buoyancy component; 18. Temporary water storage tank; 19. Flushing pipe; 20. Second sealing component; 21. Overflow pipe; 22. Elastic component; 23. Swing rod; 24. Traction rod; 25. Protrusion; 26. Loss groove. Detailed Implementation

[0020] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0021] Reference Figures 1-8As shown, this invention provides a technical solution: a modular distributed municipal road stormwater and sewage diversion and purification device, including a road base 1 and an installation groove 4 set on the road base 1. A rain grate 2 is detachably installed at the top of the installation groove 4. The rain grate 2 is a conventional technical means used to protect the top of the installation groove 4 and, while ensuring that road runoff enters the installation groove 4 normally, to initially block large-volume impurities such as tree branches, plastic bags, and large stones. A purification and diversion box 5 with an open top is detachably installed in the installation groove 4 to achieve further solidification. For the removal of solid impurities, a first filter plate 6 is detachably installed in the inner cavity of the purification diversion box 5. The surface grooves of the first filter plate 6 are smaller than those of the rain grate 2, which is used to further trap leaf debris, particulate impurities, and larger mud and sand that can pass through the rain grate 2. The first filter plate 6 is herringbone shaped with inclined surfaces on both sides, so that the trapped impurities tend to converge towards the lower point of the inclined surface under the action of rainwater scouring and their own gravity, thereby reducing the possibility of impurities accumulating and covering the filtration area and causing blockage. The filtered rainwater falls into the lower end of the inner cavity of the purification diversion box 5 and then enters the corresponding drainage path.

[0022] To collect impurities, a sludge collection box 3 is installed on the side of the purification diversion box 5. The upper end of the sludge collection box 3 is provided with a sludge inlet 16 that communicates with the inner cavity of the purification diversion box 5 and corresponds to the low point of the inclined surface of the first filter plate 6. The collected impurities can be temporarily stored in the sludge collection box 3 without affecting the normal use of the purification diversion box 5.

[0023] To reduce rainwater entering the sludge collection box 3, a second filter plate 15 is installed through the lower end of the sludge collection box 3. The area of ​​the second filter plate 15 is connected to the lower inner cavity of the purification diversion box 5. Rainwater entering the sludge collection box 3 can return to the purification diversion box 5 and be discharged through the second filter plate 15.

[0024] Although the initial rainwater filtered by the first filter plate 6 has removed larger solid impurities, it still carries fine mud, suspended matter, and pollutants formed by road erosion. To reduce the direct entry of this initial polluted rainwater into the stormwater drainage system, a diversion component is installed in the purification diversion box 5. This component includes a rainwater collection chamber 13 and a sewage collection chamber 14, which are located opposite each other on the lower side wall of the purification diversion box 5 and communicate with the purification diversion box 5. One end of the rainwater collection chamber 13 is used to connect to a nearby stormwater manhole or municipal stormwater pipe network through a corresponding rainwater connection channel in the roadbed 1. The sewage collection chamber 14 is connected to a nearby sewage manhole or sewage collection network through a corresponding sewage connection channel within the roadbed 1. Initially, the sewage collection chamber 14 is in an open state, while the rainwater collection chamber 13 is in a blocked state. At the beginning of rainfall, the initial polluted rainwater entering the purification diversion box 5 is filtered by the first filter plate 6 and then enters the sewage collection chamber 14 and is discharged to the sewage side. As the rainfall continues and the switching conditions are met, the sewage collection chamber 14 is blocked and the rainwater collection chamber 13 is opened. Subsequent rainwater is discharged normally to the rainwater side through the rainwater collection chamber 13.

[0025] To achieve the switching between sealing the rainwater collection chamber 13 and the sewage collection chamber 14, a buoyancy switching component is provided in the purification diversion box 5. In a preferred embodiment of the present invention, the buoyancy switching component includes two buoyancy chambers 7 respectively disposed on the inner side wall of the purification diversion box 5 and corresponding to the rainwater collection chamber 13 and the sewage collection chamber 14. The upper ends of the two buoyancy chambers 7 are respectively provided with overflow ports 9 corresponding to the inner cavity of the purification diversion box 5. A first buoyancy element is vertically and movably disposed in each of the two buoyancy chambers 7. 10. Each first buoyancy component 10 has a guide post 11 at its bottom that is movably and sealingly connected to the side wall of the purification diversion box 5. The lower ends of the two guide posts 11 extend into the rainwater collection chamber 13 and the sewage collection chamber 14, respectively. Each guide post 11 has a first sealing component 12 at its bottom. The first sealing component 12 is preferably a conical plug-shaped seal. The rainwater collection chamber 13 and the sewage collection chamber 14 each have a conical hole corresponding to and adapted to the first sealing component 12. The first sealing component 12 in the sewage collection chamber 14... Initially, the plug 12 is separated from the corresponding conical hole, while the first sealing component 12 in the rainwater collection chamber 13 is initially inserted into and sealed with the corresponding conical hole. The first sealing component 12 in the rainwater collection chamber 13 is located above the conical hole, and the first sealing component 12 in the sewage collection chamber 14 is located below the conical hole. When the liquid level in the two buoyancy chambers 7 rises, the two first buoyancy components 10 float upwards, driving the corresponding guide columns 11 to rise synchronously, causing the first sealing component 12 in the rainwater collection chamber 13 to rise upwards. The rainwater collection chamber 13 is opened and the sewage collection chamber 14 is closed by disengaging from the corresponding conical hole and simultaneously allowing the first sealing member 12 in the sewage collection chamber 14 to move upward into the corresponding conical hole. When the liquid level drops after the two buoyancy chambers 7 drain, the two first buoyancy members 10, the corresponding guide post 11, and the first sealing member 12 are reset under the action of gravity, causing the rainwater collection chamber 13 to be resealed and the sewage collection chamber 14 to be reopened. Thus, the mutual exclusion switching of the two drainage paths is achieved by using the same upward and downward movement.

[0026] To allow some rainwater to enter the buoyancy chamber 7 during rainfall and be discharged from the buoyancy chamber 7 after the water flow decreases or the rain stops, a delayed water inlet and outlet mechanism is provided in the purification diversion box 5. This mechanism includes a temporary water storage tank 18 located below the first filter plate 6 and open at the top. The bottom of the temporary water storage tank 18 is provided with a through hole with a small inner diameter for slow drainage. Overflow pipes 21 are respectively provided at both ends of the temporary water storage tank 18 and are connected to it. The two overflow pipes 21 extend to two outlets through corresponding overflow ports 9. In the buoyancy chamber 7, two buoyancy chambers 7 are respectively provided with a second buoyancy component 17 that cooperates with the corresponding overflow pipe 21. One end of the overflow pipe 21 extends to the inner side of the buoyancy chamber 7 and is connected to the corresponding second buoyancy component 17, so that the weight change of the temporary water storage tank 18 can be transmitted to the second buoyancy component 17 through the overflow pipe 21. The bottom of the second buoyancy component 17 is provided with a second sealing component 20 that can rise and fall with it. The inner wall of the purification diversion box 5 is provided with a drain pipe 8 that communicates with the buoyancy chamber 7 and corresponds to the second sealing component 20.

[0027] In the initial state, the elastic switching mechanism maintains the second buoyancy member 17 and the temporary water storage tank 18 connected to it in an upper position. The second sealing member 20 is offset from the end of the drain pipe 8, keeping the drain pipe 8 in a connected state. After rainfall begins, some rainwater filtered by the first filter plate 6 falls into the temporary water storage tank 18. Due to the slow drainage speed of its bottom through-hole, the water volume and weight of the temporary water storage tank 18 gradually increase, causing the second buoyancy member 17 to move downward. After the switching conditions are met, the second sealing member 20 drains the water. When the end of pipe 8 is sealed, the liquid level in the temporary water storage tank 18 continues to rise to the overflow pipe 21. The filtered rainwater enters the buoyancy chamber 7 through the overflow pipe 21 and the overflow port 9, causing the first buoyancy component 10 to rise with the increase of the liquid level in the buoyancy chamber 7 and complete the switching of the rainwater and sewage drainage path. During the continuous water supply phase, the water storage weight of the temporary water storage tank 18 and the elastic switching mechanism work together to maintain the sealing state of the second sealing component 20, so that the buoyancy chamber 7 is in a water storage state and the first buoyancy component 10 is kept in the corresponding working position.

[0028] When the rainfall continues to decrease until the inflow rate of the temporary water storage tank 18 is lower than the outflow rate of its bottom through hole, or after the rainfall stops, the temporary water storage tank 18 gradually drains water to reduce its weight. At this time, the drain pipe 8 is still blocked. The water retained in the buoyancy chamber 7 keeps the second buoyancy member 17 buoyant upward. As the weight of the temporary water storage tank 18 decreases to the release condition, the second buoyancy member 17 overcomes the remaining downward force and rises. The elastic switching mechanism then drives the second sealing member 20 to release the blockage of the drain pipe 8, allowing the water stored in the buoyancy chamber 7 to be discharged through the drain pipe 8. The first buoyancy member 10 resets as the liquid level drops. In practical applications, the volume of the temporary water storage tank 18, the flow area of ​​the bottom through hole, the buoyancy of the second buoyancy member 17, and the pre-tightening degree of the elastic switching mechanism can be matched to ensure that short-term fluctuations in water flow do not immediately cause a switch in the drainage state, and the reset is completed after the water flow becomes insufficient.

[0029] The second sealing element 20 can be vertically and movably installed on the inner wall of the buoyancy cavity 7 through the guide structure. A sealing ring can be provided on the side wall to improve the sealing effect on the end of the drain pipe 8 when the second sealing element 20 is in the sealing position.

[0030] In a preferred embodiment, the elastic switching mechanism includes a rocker arm 23 rotatably mounted on the upper end of the buoyancy cavity 7 via a pin. The free end of the rocker arm 23 is rotatably mounted with a traction rod 24 corresponding to the second buoyancy member 17 via a pin. The lower end of the traction rod 24 is rotatably connected to the second buoyancy member 17 via a pin. An elastic element 22 is provided between the rocker arm 23 at a position off its rotation center and the inner wall of the buoyancy cavity 7. The elastic element 22 is preferably a tension spring, and the line of action between the two connection points of the elastic element 22 can cross the rotation center of the rocker arm 23 as the rocker arm 23 swings, so that the rotational torque applied by the elastic element 22 to the rocker arm 23 changes direction after crossing the rotation center, and drives the rocker arm 23 to swing rapidly toward the corresponding extreme position. At the same time, when the line of action is located on different sides of the rotation center, it forms an elastic holding effect on the rocker arm 23 toward the corresponding extreme position.

[0031] Furthermore, the lower end of the second buoyancy member 17 is provided with a vertical slip groove 26, and the side wall of the second sealing member 20 is provided with a protrusion 25 extending into the inner side of the slip groove 26. The protrusion 25 is preferably a pin. In the initial open state, the protrusion 25 is located at the lower end of the slip groove 26 and the second sealing member 20 is higher than the end of the drain pipe 8. After rainfall, when the weight of the temporary water storage tank 18 gradually increases and drives the second buoyancy member 17 to move downward, the slip groove 26 moves downward relative to the protrusion 25 while the second sealing member 20 remains in place, so that the protrusion 25 moves from the lower end of the slip groove 26 to the upper end. When the protrusion 25 reaches near the upper end of the slip groove 26, the line of action of the elastic member 22 crosses the rotation center of the swing rod 23. The rotational torque of the elastic member 22 on the swing rod 23 is reversed and quickly drives the second buoyancy member 17 to continue to move downward through the traction rod 24. The upper end of the slip groove 26 then pushes the protrusion 25 and... The second sealing member 20 quickly moves downward to seal the drain pipe 8. When the rain stops or the water supply is insufficient, the second buoyancy member 17 gradually rises. The protrusion 25 moves from the upper end of the slip groove 26 to the lower end, while the second sealing member 20 remains sealed. When the protrusion 25 reaches the vicinity of the lower end of the slip groove 26 and the elastic member 22 crosses the rotation center of the swing rod 23 in the opposite direction, the elastic member 22 drives the swing rod 23 to swing rapidly towards the opening side. Through the traction rod 24 and the second buoyancy member 17, the lower end of the slip groove 26 is driven upward to pull the protrusion 25 and the second sealing member 20 away from the end of the drain pipe 8. Thus, the slip stroke is combined with the elastic switching through the center to form a state maintenance zone between opening and sealing. This allows small fluctuations in the temporary water storage volume to be absorbed by the slip stroke and the elastic maintenance state first, rather than directly causing the drain pipe 8 to open and close repeatedly. This does not affect the liquid level in the buoyancy chamber 7 and ensures the stability of the first buoyancy member 10.

[0032] Based on the above, a flushing pipe 19 is provided on the side wall of the drain pipe 8, facing the lower end area of ​​the inclined surface of the first filter plate 6. The inner diameter of the flushing pipe 19 can be larger than the inner diameter of the bottom through hole of the drain pipe 8, and / or the number of flushing pipes 19 can be greater than the number of bottom through holes of the drain pipe 8, so that the flushing pipe 19 has a larger total flow capacity. When the second sealing member 20 is released from the blockage under the action of the elastic switching mechanism, the water stored in the buoyancy chamber 7 during the aforementioned water storage stage enters the drain pipe 8 under the action of the normal liquid level head, and is discharged towards the lower end area of ​​the first filter plate 6 through the flushing pipe 19, flushing the mud, sand and particulate impurities attached or collected in this area. At the same time, after the buoyancy chamber 7 drains, it can also cause the first buoyancy member 10 to descend and reset.

[0033] It should be noted that the rocker arm 23, elastic element 22 and other structures are located in the area above the overflow port 9 to reduce the direct impact of rainwater and entrained fine particles on their hinge and elastic action. The rocker arm 23, pin and elastic element 22 can be made of stainless steel or other corrosion-resistant materials. The guide and sliding positions in contact with water can also be made of water-resistant and corrosion-resistant materials to reduce the impact of rust and jamming on the reliability of elastic switching in a long-term humid environment.

[0034] Working Principle: This device is installed in the mounting groove 4 of the road base 1. In the early stage of rainfall, the road runoff is initially intercepted by the rain grate 2 and falls to the herringbone-shaped first filter plate 6 for secondary filtration. Impurities are intercepted and collected along the slopes on both sides towards the sewage inlet 16 and enter the sewage collection tank 3. The water entering the sewage collection tank 3 flows back to the purification diversion tank 5 through the second filter plate 15. The initially polluted rainwater is discharged from the sewage side with the rainwater collection chamber 13 closed and the sewage collection chamber 14 open. At the same time, some filtered rainwater enters the temporary water storage tank 18 and gradually increases in weight. After the delayed inlet and outlet drainage mechanism reaches the switching condition, the drain pipe 8 is blocked, so that the subsequent overflow water enters the two buoyancy chambers 7 and pushes the corresponding first... The buoyancy component 10 rises, thereby opening the rainwater collection chamber 13 and sealing the sewage collection chamber 14. Subsequent rainwater is discharged from the rainwater side. When the water flow continues to decrease or the rain stops, the temporary water storage tank 18 gradually drains water to reduce weight. The second buoyancy component 17 drives the elastic switching mechanism to reverse past the center and open the drain pipe 8. The water stored in the buoyancy chamber 7 is discharged and flushed through the flushing pipe 19 to rinse the lower area of ​​the first filter plate 6. At the same time, the first buoyancy component 10 drops with the liquid level to restore the rainwater and sewage drainage path to its initial state. After a certain period of use, the rain grate 2 can be opened and the first filter plate 6, sewage collection box 3 or purification diversion box 5 can be removed as needed for maintenance. The collected impurities and internal sediments can be cleaned and then reinstalled.

[0035] Based on the above structure, this device uses a detachable purification diversion box 5 as a modular unit for a single road drainage node. It can be distributed and connected to nearby rainwater and sewage systems at different road grate locations, thus embodying modular and distributed design features. The grate 2 and the first filter plate 6 form a graded solid impurity interception system, while the sludge collection box 3 achieves centralized collection of impurities, constituting a physical pre-purification of the road flow. The two buoyancy chambers 7 and the corresponding first buoyancy components 10 utilize the buoyancy generated by the rainwater itself to achieve non-electrical separation between the initial polluted rainwater and subsequent rainwater. The temporary water storage tank 18, the second buoyancy component 17, and the flexible switching mechanism keep the drainage pipe 8 blocked during the continuous water supply phase and open it after the water supply becomes insufficient. This improves the tolerance of the main buoyancy state to short-term water volume fluctuations. The water stored in the buoyancy chamber 7 after the rain stops is used to flush the lower end of the first filter plate 6. This allows the rainwater and sewage diversion, filtration and collection, delayed reset, and rainwater self-cleaning to form a continuous coordination around the same hydraulic process. This improves the diversion reliability and maintenance convenience of the road rainwater inlet without adding too much independent power and complex actuators.

[0036] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A modular distributed municipal road rainwater and sewage separation and purification device, characterized in that, It includes a purification diversion box with an opening at the top, a first filter plate in the shape of a herringbone inside the purification diversion box, and a rainwater collection chamber and a sewage collection chamber connected to its inner cavity at the bottom. The purification diversion box is equipped with a buoyancy switching component, which includes two buoyancy chambers corresponding to the rainwater collection chamber and the sewage collection chamber respectively. A first buoyancy component is vertically and movably installed in each of the two buoyancy chambers. The two first buoyancy components are respectively connected to a first sealing component. The two first sealing components are used to control the opening and closing of the rainwater collection chamber and the sewage collection chamber respectively, and rise and fall with the corresponding first buoyancy component, so that the opening and closing states of the two collection chambers are opposite. The purification diversion box is equipped with a delayed water inlet and outlet mechanism, which includes a temporary water storage tank and a second buoyancy component, a second sealing component, and an elastic switching mechanism installed in the buoyancy cavity. The temporary water storage tank receives part of the rainwater filtered by the first filter plate and supplies water to the buoyancy cavity, and is linked with the second buoyancy component. The buoyancy cavity is connected to a drain pipe. The second sealing component is connected to the second buoyancy component and corresponds to the drain pipe. The elastic switching mechanism is used to maintain the open position or the closed position of the second sealing component, and changes the direction of elastic action after the second buoyancy component reaches the switching position, so that the second sealing component switches between the open position and the closed position.

2. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 1, characterized in that, It also includes a roadbed with an installation groove. The purification diversion box is detachably installed in the installation groove. A rain grate is detachably installed on the top of the installation groove. The rainwater collection chamber and the sewage collection chamber are connected to the rainwater discharge system and the sewage collection system through corresponding rainwater connection channels and sewage connection channels in the roadbed, respectively.

3. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 1, characterized in that, The first filter plate has downward sloping surfaces on both sides. A sludge collection box is provided on the side of the purification diversion box. The upper end of the sludge collection box is provided with a sludge inlet that communicates with the inner cavity of the purification diversion box and corresponds to the lowest point of the slope of the first filter plate. A second filter plate is provided at the lower end of the sludge collection box, and the second filter plate communicates with the lower inner cavity of the purification diversion box.

4. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 1, characterized in that, The bottom of each of the two first buoyancy components is provided with a guide post, which extends into the rainwater collection chamber and the sewage collection chamber respectively and connects to the corresponding first sealing component.

5. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 4, characterized in that, The first sealing element is a conical plug. The rainwater collection chamber and the sewage collection chamber are respectively provided with conical holes adapted to the first sealing element. When the two first sealing elements rise synchronously with the corresponding first buoyancy elements, they respectively detach from the conical holes corresponding to the rainwater collection chamber and enter the conical holes corresponding to the sewage collection chamber.

6. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 1, characterized in that, The temporary water storage tank is located below the first filter plate and has an opening at the top. It has a through hole at the bottom for slow drainage. The temporary water storage tank is connected to an overflow pipe. The overflow pipe extends into the buoyancy chamber through the overflow port on the buoyancy chamber and connects to the second buoyancy component, so that the weight change of the temporary water storage tank is transmitted to the second buoyancy component, and the rainwater in the temporary water storage tank can enter the buoyancy chamber through the overflow pipe.

7. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 6, characterized in that, The second sealing element is vertically and movably disposed within the buoyancy cavity and corresponds to the end of the drain pipe.

8. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 6, characterized in that, The elastic switching mechanism includes a pendulum and an elastic element rotatably disposed within the buoyancy cavity. The free end of the pendulum is rotatably connected to the second buoyancy element via a traction rod. One end of the elastic element is connected to a position on the pendulum offset from its rotation center, and the other end is connected to the buoyancy cavity. The line of action of the elastic element can cross the rotation center of the pendulum as the pendulum swings, thereby reversing the rotational torque of the elastic element on the pendulum. When the line of action is located on different sides of the rotation center, it elastically holds the pendulum toward the corresponding extreme position.

9. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 8, characterized in that, The lower end of the second buoyancy member is provided with a slip groove extending along its lifting direction. The second sealing member is provided with a protrusion that extends into the slip groove. When the second buoyancy member is lifted or lowered, the slip groove can move relative to the protrusion first, and drive the second sealing member to move after the protrusion reaches the corresponding end of the slip groove.

10. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 1, characterized in that, The drain pipe has a flushing pipe on its side wall, which faces the first filter plate, and at least one drain hole is provided at the bottom of the drain pipe.

11. The modular distributed municipal road rainwater and sewage separation and purification device according to claim 10, characterized in that, The inner diameter of the flushing pipe is larger than the inner diameter of the drain hole, and / or the number of flushing pipes is greater than the number of drain holes.

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