A preliminary rainwater collection and reuse system

Abstract

The application discloses a kind of initial rainwater collection and reuse systems, it is related to rainwater reuse system field.The system includes first drain groove, water reservoir, second drain groove and greening irrigation unit.The application is combined with multiple drainage wells first by first drain groove, and the relatively clean rainwater of road surface initial is preferentially introduced into water reservoir, to avoid waste, water reservoir can be used as reserve water source, and water supply can be provided for green plants through greening irrigation unit in dry season, significantly reduce dependence on municipal water, achieve the purpose of efficient interception and rainwater reuse.Excessive rainwater in rainy season enters first drain groove, and rainwater can be discharged to second drain groove by third connecting pipe, water reservoir and second connecting pipe, to reduce instantaneous pressure of pipe network in the system and reduce the risk of waterlogging;Large particles impurities in initial rainwater are intercepted by filter screen box, and irrigation filter screen cylinder further purifies water source delivered from water reservoir to water delivery pipe, to avoid blockage of greening irrigation unit, and ensure stable operation of irrigation.

Description

Technical Field

[0001] This invention relates to the field of rainwater reuse systems, and more specifically to an initial rainwater harvesting and reuse system. Background Technology

[0002] The current practice of using municipal water for irrigation, involving water trucks and workers, wastes a significant amount of municipal water, increases labor costs, and provides limited irrigation. Relying on the combined efforts of water trucks and workers, it's difficult to irrigate all the city's greenery simultaneously, resulting in many plants dying due to lack of timely watering. During the rainy season, excess rainwater is discharged into rivers and flows downstream, failing to effectively utilize water resources and meet the irrigation needs of greenery. Furthermore, during the rainy season, the municipal drainage network experiences high pressure and is filled with garbage and impurities, reducing drainage capacity and exacerbating urban flooding.

[0003] Current urban drainage systems typically discharge relatively clean rainwater directly into rivers at the beginning of the rainy season, failing to provide a reserve of water for greening irrigation during the dry season, resulting in water waste. Traditional pipes cannot dynamically divert water during heavy rain, leading to pipe network overload and causing urban flooding. Furthermore, impurities carried by rainwater directly enter the drainage pipes, posing a risk of pipe blockage, reducing drainage efficiency and exacerbating flooding. Summary of the Invention

[0004] In view of this, the present invention provides an initial rainwater harvesting and reuse system to solve the problems mentioned in the background art.

[0005] This invention provides an initial rainwater harvesting and reuse system, comprising:

[0006] The first drainage ditch has a plurality of drainage wells suitable for installation on the side of the road surface connected to its top, and the top of the drainage wells is provided with a well cover with a water inlet hole;

[0007] The water storage tank is connected to the first drainage trough via a first connecting pipe, and a filter screen box is provided at the inlet end of the first connecting pipe.

[0008] The second drainage channel is connected to the bottom of the water storage tank via a second connecting pipe;

[0009] A greening irrigation unit includes a water pump box located in the greening planting area, a water delivery pipe connected to the water pump box at one end, and the other end of the water delivery pipe extending into the bottom of the water storage tank and connected to an irrigation filter screen at the end.

[0010] The top of the water storage tank is also connected to the first drainage trough via a third connecting pipe to form a diversion drainage channel.

[0011] Beneficial Effects: This invention features a three-tiered diversion structure consisting of a first drainage ditch, a reservoir, and a second drainage ditch. Firstly, the first drainage ditch, combined with multiple drainage wells, preferentially directs relatively clean rainwater from the initial road surface into the reservoir, preventing direct discharge into rivers and waste. The reservoir, acting as a water reserve, can supply water to green plants during the dry season via the greening irrigation unit, significantly reducing reliance on municipal water and achieving efficient rainwater interception and reuse. The top of the reservoir connects to the first drainage ditch via a third connecting pipe, forming a diversion channel. During the rainy season, excessive rainwater entering the first drainage ditch can be discharged to the second drainage ditch via the third connecting pipe, the reservoir, and the second connecting pipe, reducing instantaneous pressure on the system's pipe network and mitigating the risk of flooding. A filter screen intercepts large particles of impurities in the initial rainwater, preventing them from entering the reservoir. The irrigation filter further purifies the water supplied from the reservoir to the water pipes, preventing blockages in the greening irrigation unit and ensuring long-term stable operation of the greening irrigation system. Water storage tanks can be distributed at multiple points around the roadside green areas to provide water to the green areas and fully cover the urban green spaces.

[0012] In some embodiments, a liquid level sensor is provided inside the water storage tank, and a second solenoid valve is installed on the second connecting pipe to control the on / off state of the water storage tank and the second drainage tank.

[0013] A third solenoid valve is installed on the third connecting pipe to open or close the connection between the first drainage trough and the water storage tank through the third connecting pipe.

[0014] The liquid level sensor is electrically connected to the second solenoid valve and the third solenoid valve respectively through an external controller.

[0015] Beneficial effects: The water level in the reservoir is monitored in real time by a level sensor. When the water level reaches the upper limit, the external controller closes the third solenoid valve, stops the first drainage trough from receiving water, and opens the second solenoid valve to discharge excess rainwater into the second drainage trough, preventing the reservoir from overloading and overflowing onto the road surface. During periods of low rainfall, the third solenoid valve remains open, and the first drainage trough is connected to the reservoir for priority water storage. During periods of excessive rainwater in the rainy season, the second solenoid valve actively discharges excess rainwater, achieving a switch between drought storage and flood drainage, and improving the system's adaptability to extreme weather conditions during the rainy season.

[0016] In some embodiments, a first solenoid valve is installed on the first connecting pipe to open or close the connection between the first drainage tank and the water storage tank through the first connecting pipe, and the liquid level sensor is electrically connected to the first solenoid valve through an external controller.

[0017] Beneficial effects: By closing the first and second connecting pipes respectively using the first and third solenoid valves, the connection between the first drainage trough and the water storage tank can be completely shut off. For example, when the water quality in the water storage tank deteriorates, eutrophication occurs due to long-term disuse, or maintenance is required, closing the first and third solenoid valves can isolate the water source and prevent the spread of pollution.

[0018] In some embodiments, the filter box includes an inner box, a fixing plate, and multiple filter plates. The fixing plate is fixedly disposed on one side of the inner box and is installed in the first drainage groove through fixing holes. The inner box is provided with multiple plate slots to assemble multiple filter plates. The multiple filter plates are arranged at intervals along the length of the inner box.

[0019] The side of the inner box closest to the fixed plate is designated as the water inlet side, and the side of the inner box away from the fixed plate is designated as the drainage side, with a plurality of drainage holes provided on the drainage side.

[0020] Beneficial effects: The inner box and the fixing plate combine to form an installation base, and multiple filter plates are assembled into multiple plate slots to achieve multi-stage filtration and prevent rainwater from carrying impurities and clogging the pipes.

[0021] In some embodiments, the fixing holes are respectively provided at the four corners of the fixing plate.

[0022] Beneficial effects: The filter screen box is fixedly installed in the first drainage channel by the fixing holes at the four corners of the fixing plate and the external fasteners, which ensures the connection strength and ensures that the filter screen box remains stable under the impact of high-speed water flow, avoiding displacement that could lead to filtration failure.

[0023] In some embodiments, along the direction from the water inlet side to the water outlet side, each filter plate is inserted into the plate slot in descending order of mesh size.

[0024] Beneficial effects: By setting filter plates with different mesh sizes, rainwater is filtered in a gradient along the flow direction; large mesh filter plates intercept large impurities such as tree branches and plastic bags, while small mesh filter plates adsorb silt and sand, establishing a coarse and fine filtration method, reducing the filtration load and the probability of downstream pipeline blockage.

[0025] In some embodiments, the bottom of the drainage well is provided with a threaded sleeve and a drainage filter cylinder, the drainage filter cylinder is detachably connected to the threaded sleeve by threads, and the surface of the drainage filter cylinder is provided with filter holes.

[0026] Beneficial effects: The threaded sleeve at the bottom of the drainage well and the drainage filter screen form a detachable pre-filter to intercept small impurities that are missed by the well cover; the threaded connection design allows the filter screen to be disassembled and installed by hand, improving cleaning efficiency and preventing impurities from accumulating and fermenting after entering the first drainage trough, thus ensuring the reliability of the water quality in the water storage tank.

[0027] In some embodiments, the bottom side of the water storage tank is provided with a plurality of drain outlets and a concave arc-shaped surface, the plurality of drain outlets being evenly spaced apart, and the drain outlets being located at the lowest position of the arc-shaped surface.

[0028] Beneficial effects: The curved surface at the bottom of the reservoir and the low-lying drainage outlet work together to facilitate the discharge of silt. The curved surface allows silt to naturally settle at the lowest point, and the drainage outlet concentrates the discharge of sediment, reducing dead spots in silt removal. Multiple spaced drainage outlets facilitate the rapid discharge of rainwater and silt from the reservoir, avoiding blockages.

[0029] In some embodiments, the pump housing is provided with a pump component, which is connected to an irrigation pipe, and the irrigation pipe is connected to a plurality of drippers pre-embedded in the soil or on the side of plant roots.

[0030] Beneficial effects: The water pump housing achieves irrigation through drip irrigation, which can be pre-buried on the side of the plant roots to directly deliver rainwater to the root system and reduce evaporation loss; the water pump can start irrigation according to actual needs, such as at night, for automated irrigation to meet the needs of greening.

[0031] In some embodiments, the height of the first drainage ditch is greater than the height of the water storage tank, and the height of the water storage tank is greater than the height of the second drainage ditch.

[0032] Beneficial effects: The present invention has a three-level height difference design, which can form a gravity flow design. Initial rainwater can flow into the water storage tank through the drainage well and the first drainage channel without power.

[0033] In some embodiments, the height of the end of the first connecting pipe that connects to the first drainage channel is higher than the height of the end of the second connecting pipe that connects to the first drainage channel.

[0034] Beneficial effect: Setting the inlet of the first connecting pipe higher than the inlet of the third connecting pipe ensures priority water storage and meets irrigation needs.

[0035] In some embodiments, the height of the end of the water supply pipe that connects to the water storage tank is higher than the height of the end of the third connecting pipe that connects to the water storage tank.

[0036] Beneficial effects: The inlet of the water delivery pipe is higher than the inlet of the second connecting pipe to avoid sucking in sediment from the reservoir during irrigation, thereby improving irrigation efficiency and quality.

[0037] In some embodiments, the water storage tank has a double-layer structure, including an inner tank and an outer tank. The inner tank is connected to the first connecting pipe, and the water supply pipe is connected to the inner tank. Water overflowing from the inner tank flows into the outer tank, and the outer tank is connected to the third connecting pipe.

[0038] Beneficial effects: The reservoir achieves stratified water quality management through its double-layer structure. The inner layer stores clean rainwater for irrigation. When the inner layer is full, the overflow flows into the outer layer and is then distributed into the municipal pipe network through a third connecting pipe, preventing impurities from flowing back and polluting the inner layer. The outer layer serves as an emergency water storage space, which can temporarily accommodate excess rainwater during heavy rain to alleviate pressure on the municipal pipe network and reduce the risk of urban flooding. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of an initial rainwater harvesting and reuse system according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the manhole cover in the initial rainwater harvesting and reuse system according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the filter screen box in the initial rainwater harvesting and reuse system of this invention.

[0043] Figure 4 This is a schematic diagram of the first drainage trough in the initial rainwater harvesting and reuse system according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the water storage tank in the initial rainwater harvesting and reuse system of this invention.

[0045] Figure 6 This is a schematic diagram of the connection of the water pump casing in the initial rainwater harvesting and reuse system according to an embodiment of the present invention;

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. First drainage ditch; 2. Roadside; 3. Water storage tank; 31. Inner tank; 32. Outer tank; 301. Drainage outlet; 302. Curved surface; 4. Second drainage ditch; 5. Drainage well; 6. First connecting pipe; 7. Filter screen box; 701. Inner box; 702. Fixing plate; 703. Fixing hole; 704. Plate slot; 705. Filter plate; 706. Drainage hole; 8. Second connecting pipe; 9. Second solenoid valve; 10. Water supply pipe; 11. Green area; 12. Water pump box; 1201. Irrigation pipe; 1202. Drip device; 13. Manhole cover; 1301. Water inlet; 1302. Threaded sleeve; 1303. Drainage filter screen cylinder; 1304. Filter hole; 14. Third solenoid valve; 15. Irrigation filter screen cylinder; 16. First solenoid valve; 17. Liquid level sensor; 18. Third connecting pipe. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] This invention aims to solve the problem that urban drainage systems cannot simultaneously collect and utilize rainwater and divert and prevent flooding during heavy rain. For example, relatively clean rainwater is directly discharged into rivers at the beginning of the rainy season, failing to provide a reserve water source for greening irrigation during the dry season, resulting in a waste of rainwater resources. Traditional pipes cannot dynamically divert water during heavy rain, leading to pipe network overload and causing urban flooding. Impurities carried by rainwater directly enter the drainage pipes, reducing drainage efficiency and exacerbating flooding. The drainage system has insufficient capacity and there is a risk of pipe blockage.

[0050] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0051] According to embodiments of the present invention, an initial rainwater harvesting and reuse system is provided, such as... Figure 1 As shown, the system includes a first drainage ditch 1, a water storage tank 3, a second drainage ditch 4, and a greening irrigation unit. The water storage tank 3 is connected to the first drainage ditch 1 through a first connecting pipe 6, and the second drainage ditch 4 is connected to the bottom of the water storage tank 3 through a second connecting pipe 8. The second drainage ditch 4 can be connected to the municipal pipe network.

[0052] In this embodiment, as Figure 1 As shown, the top of the first drainage ditch 1 is connected to a plurality of drainage wells 5, which are suitable for being set on the sides of the road surface 2, such as both sides of the road surface; the top of the drainage well 5 is provided with a well cover 13 with a water inlet hole 1301.

[0053] In this embodiment, as Figure 1 and Figure 4 As shown, the inlet end of the first connecting pipe 6 is equipped with a filter screen box 7; the greening irrigation unit includes a water pump box 12 located in the greening planting area, a water supply pipe 10 connected to the water pump box 12 at one end, and the other end of the water supply pipe 10 extends into the bottom of the water storage tank 3 and is connected to an irrigation filter screen cylinder 15 at the end; the top of the water storage tank 3 is also connected to the first drainage trough 1 through a third connecting pipe 18 to form a diversion drainage channel.

[0054] The initial rainwater harvesting and reuse system provided in this embodiment is designed with a three-level diversion structure consisting of a first drainage channel 1, a water storage tank 3, and a second drainage channel 4. First, the relatively clean rainwater from the road surface is preferentially diverted into the water storage tank 3 through the combination of the first drainage channel 1 and multiple drainage wells 5, avoiding direct discharge into rivers and waste. The water storage tank 3 serves as a water reserve and can supply water to green plants through greening irrigation units during the dry season, significantly reducing dependence on municipal water and achieving the purpose of efficient interception and reuse of rainwater.

[0055] The top of the water storage tank 3 forms a diversion channel with the first drainage ditch 1 through the third connecting pipe 18. During the rainy season, when excessive rainwater enters the first drainage ditch 1, it can be discharged to the second drainage ditch 4 through the third connecting pipe 18, the water storage tank 3, and the second connecting pipe 8, thereby reducing the instantaneous pressure of the pipe network in the system and reducing the risk of waterlogging. The filter box 7 intercepts large particulate impurities in the initial rainwater to prevent them from entering the water storage tank 3. The water source delivered from the water storage tank 3 to the water supply pipe 10 is further purified by the irrigation filter cylinder 15, which prevents the greening irrigation unit from becoming blocked and ensures the long-term stable operation of greening irrigation.

[0056] In this embodiment, the water storage tanks 3 can be distributed at multiple points around the green area 11 on the road side 2 to provide water to the green area 11 and fully cover the urban greening.

[0057] In some embodiments, such as Figure 2 As shown, the bottom of the drainage well 5 is equipped with a threaded sleeve 1302 and a drainage filter cylinder 1303. The drainage filter cylinder 1303 is detachably connected to the threaded sleeve 1302 via threads, and the surface of the drainage filter cylinder 1303 is provided with filter holes 1304. The threaded sleeve 1302 and the drainage filter cylinder 1303 at the bottom of the drainage well 5 constitute a detachable front-mounted filter part to intercept small impurities that are missed by the well cover 13. The threaded connection design allows the filter cylinder to be disassembled and installed by hand, improving cleaning efficiency and preventing impurities from accumulating and fermenting after entering the first drainage trough 1, thus preventing the generation of odors and ensuring the reliable water quality of the water storage tank 3.

[0058] In some embodiments, the height of the first drainage trough 1 is greater than the height of the reservoir 3, and the height of the reservoir 3 is greater than the height of the second drainage trough 4. Specifically, the lowest point of the inner cavity of the first drainage trough 1 is higher than the highest point of the inner cavity of the reservoir 3, and the lowest point of the inner cavity of the reservoir 3 is higher than the highest point of the inner cavity of the second drainage trough 4. This embodiment establishes a three-level height difference design, which can form a gravity-fed design, so that the initial rainwater can flow into the reservoir 3 through the drainage well 5 and the first drainage trough 1 without power.

[0059] In some embodiments, such as Figure 1 As shown, a liquid level sensor 17 is installed inside the water storage tank 3. A first solenoid valve 16 is installed on the first connecting pipe 6 to open or close the connection between the first drainage trough 1 and the water storage tank 3 through the first connecting pipe 6. A second solenoid valve 9 is installed on the second connecting pipe 8 to control the on / off state between the water storage tank 3 and the second drainage trough 4. A third solenoid valve 14 is installed on the third connecting pipe 18 to open or close the connection between the first drainage trough 1 and the water storage tank 3 through the third connecting pipe 18. The liquid level sensor 17 is electrically connected to the first solenoid valve 16, the second solenoid valve 9, and the third solenoid valve 14 through an external controller.

[0060] Through the above scheme, the first solenoid valve 16 and the third solenoid valve 14 respectively close the first connecting pipe 6 and the second connecting pipe 8, thus completely shutting off the connection between the first drainage trough 1 and the water storage tank 3. For example, when the water quality of the water storage tank 3 deteriorates, or when it becomes eutrophic due to long-term disuse or requires maintenance, closing the first solenoid valve 16 and the third solenoid valve 14 can isolate the water source and prevent the spread of pollution.

[0061] The water level in the reservoir 3 is monitored in real time by the level sensor 17. When the water level reaches the upper limit, the external controller closes the third solenoid valve 14, stops the first drainage trough 1 from receiving water, and opens the second solenoid valve 9 to discharge excess rainwater into the second drainage trough 4, preventing the reservoir 3 from overloading and overflowing onto the road surface. When the rainfall is light, the third solenoid valve 14 remains open, and the first drainage trough 1 is connected to the reservoir 3 to prioritize water storage. During the rainy season, when there is excessive rainwater, the second solenoid valve 9 actively discharges the excess rainwater, realizing the switching between drought storage and flood drainage, and improving the system's adaptability to extreme weather during the rainy season.

[0062] In some embodiments, such as Figure 1 As shown, the height of the end of the first connecting pipe 6 that connects to the first drainage trough 1 is higher than the height of the end of the third connecting pipe 18 that connects to the first drainage trough 1. Setting the inlet of the first connecting pipe 6 higher than the inlet of the third connecting pipe 18 ensures priority water storage and meets irrigation needs.

[0063] In some embodiments, such as Figure 5As shown, the water storage tank 3 has a double-layer structure, including an inner tank 31 and an outer tank 32. The inner tank 31 is connected to the first connecting pipe 6, and the water supply pipe 10 is connected to the inner tank 31. After the water in the inner tank 31 overflows, it flows into the outer tank 32. The outer tank 32 is connected to the third connecting pipe 18. The water storage tank 3 achieves stratified water quality management through its double-layer structure. Clean rainwater is stored in the inner tank 31 for irrigation. When the inner tank 31 is full, it overflows into the outer tank 32 and is then diverted through the third connecting pipe 18 to be discharged into the municipal pipe network, preventing impurities from flowing back and polluting the inner tank 31. The outer tank 32 serves as an emergency water storage space, which can temporarily accommodate excess rainwater during heavy rain to alleviate pressure on the municipal pipe network and reduce the risk of urban flooding.

[0064] Specifically, the inner pool 31 is connected to the inlet of the first connecting pipe 6, and the inner pool 31 receives and stores the initial rainwater. The inlet of the water supply pipe 10 is connected to the inner pool 31 for irrigation. The outer pool 32 is connected to the third connecting pipe 18 to receive excess rainwater during the rainy season.

[0065] In some embodiments, such as Figure 3 and Figure 4 As shown, the filter box 7 includes an inner box 701, a fixing plate 702, and multiple filter plates 705. The fixing plate 702 is fixedly disposed on one side of the inner box 701 and is installed in the first drainage channel 1 through fixing holes 703. The inner box 701 has multiple plate slots 704 inside to assemble the multiple filter plates 705. The multiple filter plates 705 are arranged at intervals along the length of the inner box 701. The side of the inner box 701 closest to the fixing plate 702 is designated as the water inlet side, and the side of the inner box 701 away from the fixing plate 702 is designated as the drainage side. The drainage side has several drainage holes 706. The inner box 701 and the fixing plate 702 combine to form an installation base, and the multiple filter plates 705 are assembled into the multiple plate slots 704 to achieve multi-stage filtration and prevent rainwater from carrying impurities and clogging the pipes.

[0066] In some embodiments, such as Figure 3 As shown, fixing holes 703 are provided at the four corners of the fixing plate 702. The filter screen box 7 is fixedly installed on the first drainage trough 1 through the fixing holes 703 at the four corners of the fixing plate 702 and the external fasteners, ensuring the connection strength and ensuring that the filter screen box 7 remains stable under the impact of high-speed water flow, avoiding displacement that would lead to filtration failure.

[0067] In a preferred embodiment, along the direction from the inlet side to the outlet side, each filter plate 705 is inserted into the plate slot 704 in descending order of mesh size. By setting filter plates 705 with different mesh sizes, rainwater is filtered in a gradient along the flow direction; the large-mesh filter plates 705 intercept large impurities such as tree branches and plastic bags, while the small-mesh filter plates 705 adsorb silt, establishing a coarse and fine filtration method, reducing the filtration load, and reducing the probability of downstream pipe blockage.

[0068] In some embodiments, such as Figure 5 As shown, the bottom side of the reservoir 3 is provided with multiple drainage outlets 301 and a concave arc-shaped surface 302. The multiple drainage outlets 301 are evenly spaced apart, and the drainage outlets 301 are located at the lowest position of the arc-shaped surface 302. The arc-shaped surface 302 at the bottom of the reservoir 3 and the low-positioned drainage outlets 301 work together to promote the discharge of silt. The arc-shaped surface 302 allows silt to naturally deposit at the lowest point, while the drainage outlets 301 concentrate the discharge of sediment, reducing dead corners for silt removal. The multiple spaced drainage outlets 301 facilitate the rapid discharge of rainwater, silt, etc. from the reservoir 3, avoiding blockages.

[0069] In some embodiments, such as Figure 6 As shown, the pump housing 12 houses a pump unit connected to an irrigation pipe 1201. Multiple drippers 1202, pre-embedded in the soil or near the plant roots, are connected to the irrigation pipe 1201. Irrigation is achieved through the drippers 1202, which can be pre-embedded near the plant roots to directly deliver rainwater to the roots, reducing evaporation loss. The pump unit activates irrigation according to actual needs, such as during nighttime for automated irrigation, meeting the needs of landscaping.

[0070] In some embodiments, such as Figure 1 As shown, the height of the end of the water supply pipe 10 that connects to the water storage tank 3 is higher than the height of the end of the third connecting pipe 18 that connects to the water storage tank 3. The inlet of the water supply pipe 10 is higher than the inlet of the second connecting pipe 8 to avoid sucking in sediment from the water storage tank 3 during irrigation, thereby improving irrigation efficiency and quality.

[0071] The initial rainwater harvesting and reuse system provided in this embodiment operates as follows:

[0072] During the initial rainfall, rainwater enters the filter screen cylinder through the inlet hole 1301 on the manhole cover 13. It undergoes initial filtration through the filter holes 1304 on the drainage filter screen cylinder 1303, and then flows into the first drainage trough 1 through the drainage well 5. When the water level in the first drainage trough 1 becomes too high and reaches the filter screen box 7, it is filtered by several filter plates 705 within the filter screen box 7. The water then flows through the first connecting pipe 6 into the water storage tank 3 for storage, relieving drainage pressure. When the inner pool 31 of the water storage tank 3 is full, the water overflows into the outer pool 32 and then flows through the second connecting pipe 8 into the water storage tank 3. The water enters the second drainage trough 4 and is drained through the second drainage trough 4. When the rainfall is heavy and lasts for a long time, the switch of the third solenoid valve 14 can be opened to allow the rainwater to quickly enter the second drainage trough 4. A sludge discharge pipe can also be installed at the bottom of the water storage tank 3. The sludge discharge pipe is connected to the second drainage trough 4. During the rainy season, rainwater can be used to remove the sludge that has settled in the water storage tank 3, thereby increasing the water storage capacity of the water storage tank 3. When the rainfall is light, the water level can be sensed by the liquid level sensor 17. When the water level reaches the set value, the second solenoid valve 9 and the first solenoid valve 16 are automatically closed, and the excess rainwater is discharged from the first drainage trough 1.

[0073] When irrigation is needed for the green plants, the water pump in the pump box 12 is used to draw water from the inner pool 31 of the water storage tank 3 to the irrigation pipe 1201. The water is then dripped through the dripper 1202 on the irrigation pipe 1201 to achieve simultaneous irrigation of the green plants along the city roads.

[0074] The initial rainwater harvesting and reuse system provided in this embodiment integrates water storage and diversion functions within a limited urban space by using the layout of the underground water storage tank 3 and double drainage channels. Based on the liquid level in the water storage tank 3, the system uses a solenoid valve group to dynamically allocate the direction of rainwater flow, achieving the design goal of storing water during light rain and draining water during heavy rain.

[0075] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An initial rainwater harvesting and reuse system, characterized in that, include: The first drainage channel (1) is connected at its top to a plurality of drainage wells (5) suitable for installation on the side of the road surface (2). The top of the drainage well (5) is provided with a well cover (13) with a water inlet hole (1301). The water storage tank (3) is connected to the first drainage trough (1) through the first connecting pipe (6). The inlet end of the first connecting pipe (6) is provided with a filter screen box (7). A first solenoid valve (16) is installed on the first connecting pipe (6) to open or close the state of connecting the first drainage trough (1) and the water storage tank (3) through the first connecting pipe (6). The second drainage trough (4) is connected to the bottom of the water storage tank (3) through the second connecting pipe (8); a second solenoid valve (9) is installed on the second connecting pipe (8) to control the on / off state of the water storage tank (3) and the second drainage trough (4); The greening irrigation unit includes a water pump housing (12) located in the greening planting area, a water delivery pipe (10) connected to the water pump housing (12) at one end, and the other end of the water delivery pipe (10) extending into the bottom of the water storage tank (3) and connected to an irrigation filter screen cylinder (15) at the end. The top of the water storage tank (3) is connected to the first drainage trough (1) through a third connecting pipe (18) to form a diversion drainage channel; a third solenoid valve (14) is installed on the third connecting pipe (18) to open or close the state of the connection between the first drainage trough (1) and the water storage tank (3) through the third connecting pipe (18); The water storage tank (3) is equipped with a liquid level sensor (17), which is electrically connected to the first solenoid valve (16), the second solenoid valve (9), and the third solenoid valve (14) respectively through an external controller. The water storage tank (3) has a double-layer structure, including an inner tank (31) and an outer tank (32). The inner tank (31) is connected to the first connecting pipe (6), and the water supply pipe (10) is connected to the inner tank (31). Water overflows from the inner tank (31) and flows into the outer tank (32). The outer tank (32) is connected to the third connecting pipe (18). The bottom side of the water storage tank (3) is provided with multiple drain outlets (301) and a concave arc-shaped curved surface (302). The multiple drain outlets (301) are evenly spaced apart, and the drain outlets (301) are located at the lowest position of the arc-shaped curved surface (302). The height of the first drainage trough (1) is greater than the height of the water storage tank (3), and the height of the water storage tank (3) is greater than the height of the second drainage trough (4). The height of the end of the first connecting pipe (6) that connects to the first drainage trough (1) is higher than the height of the end of the third connecting pipe (18) that connects to the first drainage trough (1); The height of the end of the water supply pipe (10) that connects to the water storage tank (3) is higher than the height of the end of the second connecting pipe (8) that connects to the water storage tank (3).

2. The initial rainwater harvesting and reuse system according to claim 1, characterized in that, The filter box (7) includes an inner box (701), a fixing plate (702), and multiple filter plates (705). The fixing plate (702) is fixedly disposed on one side of the inner box (701). The fixing plate (702) is installed in the first drainage groove (1) through fixing holes (703). The inner box (701) is provided with multiple plate slots (704) to assemble multiple filter plates (705) accordingly. The multiple filter plates (705) are arranged at intervals along the length of the inner box (701). The inner box (701) is configured with a water inlet side on the side near the fixing plate (702), and the inner box (701) is configured with a drain side on the side away from the fixing plate (702). The drain side is provided with a plurality of drain holes (706).

3. The initial rainwater harvesting and reuse system according to claim 2, characterized in that, The fixing holes (703) are respectively provided at the four corners of the fixing plate (702); and / or; Along the direction from the water inlet side to the water outlet side, each filter plate (705) is inserted into the plate slot (704) in descending order of mesh size.

4. The initial rainwater harvesting and reuse system according to claim 1, characterized in that, The bottom of the drainage well (5) is provided with a threaded sleeve (1302) and a drainage filter cylinder (1303). The drainage filter cylinder (1303) is detachably connected to the threaded sleeve (1302) by threads. The surface of the drainage filter cylinder (1303) is provided with filter holes (1304).

5. The initial rainwater harvesting and reuse system according to claim 1, characterized in that, The pump housing (12) is equipped with a pump component, which is connected to an irrigation pipe (1201). The irrigation pipe (1201) is connected to a plurality of drippers (1202) pre-embedded in the soil or on the side of plant roots.

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